KR102090639B1 - Cookware and cooking equipment - Google Patents

Abstract

The present invention relates to the technical field of electrothermal products, and discloses a cookware and a cooking device. The cookware of the present invention includes a base member and a non-stick coating layer formed by the base member, and the non-stick coating layer includes a mixed layer of a ceramic material and a fluororesin material. The non-stick coating layer comprising a mixed layer of a ceramic material and a fluororesin material has high surface hardness and a high bonding strength of the coating layer, excellent scratch resistance, corrosion resistance and wettability, and long service life.

Description

Cookware and cooking equipment {COOKWARE AND COOKING EQUIPMENT}

The present invention relates to the technical field of electrothermal electric products, and more particularly, to a cookware and a cooking apparatus.

The conventional non-stick coating layer is mainly a Teflon PTFE non-stick coating layer or a ceramic non-stick coating layer. All of these coating layers are treated with air pressure spraying or electrostatic spraying, and then a conventional molding method for sintering and curing at a high temperature is used. However, the lifetime of such a coating layer is generally only 6 months to 1 year, and the hardness of the coating layer is low (the Vickers hardness of the PTFE non-stick coating layer is 100 to 200 HV, and the Vickers hardness of the ceramic non-stick coating layer is 200 to 350 HV). , The adhesion of the coating layer is small (the binding strength of the PTFE non-stick coating layer is 2 to 10 MPa, the bonding strength of the ceramic non-stick coating layer is 2 to 5 MPa), and the thickness of the coating layer is smaller (the thickness of the PTFE non-stick coating layer is 20 to 50 µm. , And the thickness of the ceramic non-stick coating layer is 20 ~ 40㎛), acid resistance, alkali resistance, and salt resistance are also normal, and in the course of long-term use, scratches, abrasion damage, corrosion cannot be avoided, and the coating layer peels off and loses its effectiveness. After the surface coating layer loses its effectiveness, this non-stick coating layer does not have non-stick properties (anti-stick performance), which greatly limits the life and application of the coating layer.

Conventional cooking utensils, such as frying pans, rice cookers, and pressure cooker inner tubes, have already widely used non-stick coating layers. Providing an excellent coating layer that continuously maintains non-stick properties has already become a decisive issue in the field of kitchenware.

The present invention was devised to solve the conventional technical problems as described above, the cookware having a non-stick coating layer having a high surface hardness, a high bonding strength of the coating layer, a scratch resistance, corrosion resistance and wettability, and a long service life. And it is an object to provide a cooking device.

In order to achieve the above object, on the other hand, the present invention provides a cookware comprising a base member and a non-stick coating layer formed on the surface of the base member and comprising a mixed layer of a ceramic material and a fluororesin material.

In one preferred embodiment of the present invention, the non-stick coating layer includes a mixed layer of ceramic and PFA.

In one preferred embodiment of the present invention, the non-stick coating layer is an integrated layer of particulate material, and the particulate material includes a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core.

In one preferred embodiment of the present invention, the non-stick coating layer is an integrated layer of a particulate material having a flat structure, and the particulate material comprises a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core. Included, the thickness (D) of the ceramic particle core is distributed within a range of 1 to 10 μm, the lateral diameter (R) is distributed within a range of 50 to 400 μm, and 1 / 4R²D is distributed within a range of 8000 to 40000 μm³.

In one preferred embodiment of the present invention, the non-stick coating layer is an integrated layer of particulate material, the particulate material includes ceramic particles, fluoro resin particles and coated composite particles, and the coated composite particles are ceramic And a fluororesin material coating layer covering the particle core and the outer peripheral surface of the ceramic particle core.

In one preferred embodiment of the present invention, the non-stick coating layer is an integrated layer of a particulate material having a flat structure, and the particulate material includes ceramic particles and fluororesin particles interspersed and distributed, and the particulate material The thickness (D) of 1 ~ 10㎛, the lateral diameter (R) is 40 ~ 530㎛, 1 / 4R²D is 5000 ~ 70000μm³.

In one preferred embodiment of the present invention, the non-stick coating layer includes ceramic particles and a fluoro resin dispersed between the ceramic particles, and 80 to 95% by weight of ceramic particles and 5 based on the total weight of the non-stick coating layer. ~ 20% by weight of fluoro polyester material.

In one preferred embodiment of the present invention, the non-stick coating layer includes a fluororesin material layer and ceramic particles dispersed inside the fluororesin material layer.

On the other hand, the present invention provides a cooking apparatus including the cookware of the present invention.

1 is a microscopic morphology diagram of a modified PFA powder obtained by Preparation Example 1 of a first embodiment of the present invention.
2 is a microscopic form diagram of a conventional PFA powder.
3 is a structural example of cookware according to the first and fifth embodiments of the present invention.
Figure 4 is a structural example of the arrangement of the particles constituting the non-stick coating layer according to the first embodiment of the present invention, wherein the gray portion is a ceramic particle (for example, aluminum oxide particles and / or titanium oxide particles), The white part is PFA particles.
5 is a structural example of the cookware of the present invention.
6 is a cross-sectional side view of a non-stick coating layer according to the second and third embodiments of the present invention.
7 is a cross-sectional plan view of the non-stick coating layer according to the second and third embodiments of the present invention.
8 is a structural example of a particulate material constituting the non-stick coating layer according to the second embodiment of the present invention.
9 is a structural example of a particulate material constituting the non-stick coating layer according to the third embodiment of the present invention.
10 is a sectional side view of a non-stick coating layer according to a fourth embodiment of the present invention.
11 is a plan sectional view of a non-stick coating layer according to a fourth embodiment of the present invention.
12 is a structural example of a particulate material constituting the non-stick coating layer according to the fourth embodiment of the present invention.
13 is a side cross-sectional view of a non-stick coating layer according to a fifth embodiment of the present invention, in the drawing dark particles are ceramic particles, and light particles are fluororesin particles.
14 is a structural example of a composite coating layer of one form obtained by the seventh embodiment of the present invention.
15 is a structural example of a non-stick coating layer of one form obtained by the seventh embodiment of the present invention.
16 is a structural example of another type of composite coating layer obtained by the seventh embodiment of the present invention.
17 is a structural example of another type of non-stick coating layer obtained by the seventh embodiment of the present invention.

It is to be understood that any value and endpoints of the ranges disclosed herein are not limited to the exact range or value, and that the range or value includes a range or value adjacent to the range or value. With respect to the numerical range, one or several numerical ranges can be obtained by combining each other between the endpoint values of each range, between the endpoint values of each range and the values of separate points, and between the values of separate points. Is believed to be specifically disclosed herein.

The present invention provides a cookware formed on a base member and a non-stick coating layer formed on the base member and comprising a mixed layer of a ceramic material and a fluororesin material.

In the cookware of the present invention, the non-stick coating layer may include a mixed layer of a ceramic material and a fluororesin material, and may be made through various implementation methods below.

In the present invention, the base member may be a metal base member such as a stainless steel base member, an aluminum base member, an aluminum alloy base member, a titanium alloy base member, or a multi-layered metal composite base member (including two or more layers). Here, the multi-layered metal composite base member may be a stainless steel / aluminum base member, a stainless steel / copper base member, a stainless steel / aluminum / copper base member, or the like. And the thickness of the base member may be 0.5-6mm.

Method 1

As shown in FIG. 3, according to the first embodiment of the present invention, the cookware of the present invention includes a base member and a non-stick coating layer formed on the base member. The non-stick coating layer includes a mixed layer of ceramic and PFA. Here, the mixed layer of the ceramic and PFA is a coating layer formed of a powder in which ceramic powder and PFA powder are mixed, that is, a ceramic / PFA coating layer.

Preferably, as shown in FIG. 4, among the non-stick coating layers, ceramic particles and PFA particles are arranged in an interlocking and distributed manner.

Preferably, in the non-stick coating layer, the weight ratio of PFA and ceramic is 1: (2-6), more preferably 1: (3-5).

Preferably, the ceramic is aluminum oxide and / or titanium oxide, more preferably aluminum oxide and titanium oxide, more preferably, the weight ratio of aluminum oxide and titanium oxide is 1: (0.05 to 0.4), even more preferably Is 1: (0.2 ~ 0.3).

Preferably, the thickness of the non-stick coating layer is 30 to 400 μm, more preferably 50 to 300 μm, and even more preferably 150 to 300 μm.

Preferably, the non-stick coating layer is a non-stick coating layer prepared by the following method.

The non-stick manufacturing method includes the following procedures.

(1) The base member is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated.

(3) A ceramic powder and a modified PFA powder are mixed to obtain a powder mixture, and plasma spray coating treatment is applied to the powder mixture to form a non-stick coating layer on the surface of the base member.

Here, the sphericity of the modified PFA powder of 80% or more, preferably 90% or more, is 70% or more.

In the method of manufacturing the non-stick coating layer of the first embodiment of the present invention, those skilled in the art have a spherical ratio of the ratio of the surface area of a particle having the same volume as the particle to the surface area of the particle, the spherical ratio of the sphere is 1, and other convex bodies. It can be understood that the sphericity is less than 1. The 80% or more of the modified PFA powder has a sphericity of 70% or more means that among the randomly sampled modified PFA powders, the number of particles of the modified PFA powder having a sphericity of 70% or more, or the number of particles of the whole modified PFA powder sampled with probability, or This means that the percentage of probability is over 80%.

The inventors of the present invention have made the following creative discoveries during research. Among the existing PFA powders, the particle size (D50) is 5 to 30 µm, the sphericity of 90% or more is 10 to 30%, the fluidity is 30 to 100 s / 50 g, the purity is 90 to 95%, and the melting point is 300 ~ 400 ℃, and the surface roughness (Ra) is 0.5 ~ 0.8㎛. When using the conventional PFA powder having the above performance (as shown in the microscopic morphology of FIG. 2, the particles of the powder have low regularity, low sphericity, and the particle size distribution is relatively non-uniform), hot spray ( Yes, it is difficult to meet the manufacturing requirements of the plasma spray coating process, and the hot spray (e.g. plasma spray coating) process has high surface hardness, high bonding strength of the coating layer, good scratch resistance, corrosion resistance, wettability, and long service life. This long non-stick coating layer cannot be produced. However, after the special treatment for the existing PFA powder, the modified PFA powder having a spherical modulus of 80% or more and 70% or more (in accordance with one preferred embodiment, the particle size (D50) of the modified PFA powder is 20 to 100 μm, It is possible to obtain 80% or more of the modified PFA powder with a sphericity of 70 to 99%, and the fluidity of the modified PFA powder is less than 30 s / 50g) .The modified PFA powder is constructed in a hot spray (e.g. plasma spray coating) process. Conditions may be satisfied, and a non-stick coating layer having excellent performance may be obtained using a material containing the modified PFA powder. At the same time, the non-stick coating layer obtained as described above has the advantages of high surface hardness, high bonding strength of the coating layer, good scratch resistance, corrosion resistance and wettability, and long service life.

Preferably, the sphericity of the modified PFA powder of 90% or more is 70% or more.

Preferably, the particle size (D50) of the modified PFA powder is 20 to 100 μm, more preferably 40 to 100 μm, further preferably 45 to 60 μm.

Preferably, 80% or more, more preferably 90% or more of the modified PFA powder has a sphericity ratio of 70 to 99%, more preferably 90 to 99%.

Preferably, the fluidity of the modified PFA powder is less than 30s / 50g, more preferably 10-25s / 50g, and even more preferably 10-20s / 50g.

Preferably, the purity of the modified PFA powder is 95.5 to 99.99%, more preferably 99 to 99.99%.

Preferably, the melting point of the modified PFA powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

Preferably, the surface roughness (Ra) of the modified PFA powder is 0.1 to 0.45 μm, more preferably 0.1 to 0.3 μm.

According to the first embodiment of the present invention, preferably, the modified PFA powder satisfying the above parameter conditions is prepared by a method including the following procedure.

(a) PFA powder, adhesive, lubricant and water are mixed to prepare a paste.

(b) The paste is atomized and dried.

Preferably, in the procedure (a), the content of the PFA powder based on the weight of the paste is 30-60% by weight, more preferably 38-55% by weight, and the content of the adhesive is 0.2-2% by weight, more preferably Is 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, and the water content is 35 to 68% by weight, more preferably 42 to 60% by weight.

Preferably, in procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, in the procedure (b), the method of the spray drying treatment is airflow spray drying. The conditions of the airflow spray drying are spray pressure of 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, and spray air flow rate of 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h; The inlet temperature is 200-400 ° C, more preferably 300-350 ° C; The air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the first embodiment of the present invention, the method of the pretreatment of the procedure (1) includes sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each may be a conventional method in the art. For example, sand-plating treatment involves sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white fused alumina, gold sand, etc.). Used, the injection airflow pressure is controlled to 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the first embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 100 to 150 ° C.

According to the first embodiment of the invention, preferably in the procedure (3), the weight ratio of the modified PFA powder and the ceramic powder in the powder mixture is 1: (2-6), more preferably 1: (3-5) to be.

Preferably, the ceramic powder is an aluminum oxide powder and / or titanium oxide powder, more preferably an aluminum oxide powder and a titanium oxide powder, and more preferably, the weight ratio of the aluminum oxide powder and the titanium oxide powder is 1: (0.05 ~ 0.4), and even more preferably 1: (0.2 ~ 0.3).

Preferably, the particle size (D50) of the aluminum oxide powder is 5 to 80 μm (more preferably 5 to 30 μm), and a 90% or more aluminum oxide powder has a sphericity of 70 to 100%, and a fluidity of 10 to It is 30s / 50g.

Preferably, the particle size (D50) of the titanium oxide powder is 5 to 80 µm (more preferably 5 to 25 µm), and a 90% or more titanium oxide powder has a sphericity of 70 to 100%, and a fluidity of 10 to It is 30s / 50g.

Preferably, in the procedure (3), the plasma spray coating process includes the following conditions. Spray power is 25-60 kW, more preferably 35-45 kW, more preferably 38-42 kW; The spray distance is 60 to 100 mm, more preferably 75 to 85 mm, the spray angle is 70 to 90 °, more preferably 75 to 85 °; The powder input amount is 3.5 to 10 g / min, more preferably 5 to 7 g / min, and the PFA spray temperature is 300 to 350 ° C, more preferably 315 to 335 ° C; The spraying temperature of aluminum oxide and titanium oxide is 2800 ~ 3200 ° C, more preferably 2900 ~ 3100 ° C, spraying voltage is 50 ~ 70V, more preferably 55 ~ 65V, spraying current is 600 ~ 650A, more preferably Is 620 ~ 630A, the spray thickness is 30 ~ 400μm, more preferably 150 ~ 300㎛, the main gas is hydrogen gas, the auxiliary gas is argon gas, the flow rate of hydrogen gas is 2 ~ 6L / min, more preferably Is 3 to 5 L / min, and the flow rate of argon gas is 25 to 35 L / min, more preferably 28 to 32 L / min. Here, before the plasma spray coating treatment, each powder is mixed and stirred for 1 to 2 hours, and then dried at 100 to 120 ° C for 1 to 1.5 hours.

According to the first embodiment of the present invention, the present invention further comprises a non-stick coating layer obtained by the above method.

In the first embodiment of the present invention, the ceramic powder (preferably aluminum oxide powder and / or titanium oxide powder) is uniformly mixed with the modified PFA powder of a specific parameter, and then melted at a high speed using a plasma spray coating process. Is deposited on the base member, which is a process that melts at a high temperature and rapidly cools the ceramic powder and the modified PFA powder to hit the base member at a high speed after forming a spherical molten state, and flattening to infinite Non-stick coating layer is made by uniformly mixing and stacking the two ceramic particles and the modified PFA particles. The non-stick coating layer of the present invention has high hardness, high bonding strength, strong scratch resistance, corrosion resistance, and excellent non-stick properties.

Here, Figure 4 is a structural example of the arrangement of the particles constituting the non-stick coating layer of the present invention. The ceramic particles are distributed by intersecting the modified PFA particles with each other so that the distribution of performance such as non-stick property, scratch resistance, corrosion resistance, and wettability of the coating layer surface and inside is uniform. That is, the coating layer has excellent hydrophobicity, scratch resistance, and corrosion resistance, and the adhesion of the coating layer is strong. In addition, the method of manufacturing the coating layer has advantages such as short cycle, high efficiency, and energy saving compared to the conventional method. The coating layer is completed with one spray and the thickness can be up to 0.4 mm. In other words, the solidification molding is completed by depositing it on the base member. However, the electrostatic spraying or the air pressure spraying method must first be sprayed and then sintered at a high temperature, and if the thickness of the coating layer to be manufactured is too thick, it must be divided into several times to repeat the spraying and sintering process.

Specifically, a specific modified PFA powder is used in the method for manufacturing the non-stick coating layer of the present invention. Here, according to one preferred embodiment, the particle size (D50) of the modified PFA powder is 20 ~ 100㎛ (more preferably 40 ~ 100μm, more preferably 45 ~ 60㎛), 80% or more (preferably 90 %) The modified PFA powder has a sphericity of 70 to 99% (more preferably 90 to 99%), and a fluidity of 30 s / 50 g (more preferably 10 to 25 s / 50 g, more preferably 10 to 20 s). / 50g) By spraying the modified powder of the modified PFA powder and the ceramic powder on the surface of the base member, a non-stick coating layer having excellent non-stick performance can be obtained, and the non-stick coating layer obtained has excellent hydrophobicity and self-cleaning property. It has a high surface hardness (Vickers hardness of 300 to 550 HV, preferably 450 to 550 HV), the bonding strength of the coating layer (the bonding strength is 30 to 50 MPa, preferably 40 to 50 MPa), and the scratch resistance (in the plate) The number of wear is 6000-14000 times, preferably 11500-14000 times) is strong, The spray efficiency (25 ~ 70s / pcs, preferably 30 ~ 40s / pcs) is high, the porosity of the coating layer (1-4.5%, preferably 1-2%) is low, the service life is long, and the thickness of the coating layer ( It can be 30 ~ 400㎛), it has good acid resistance (no phenomena such as bleaching, bubbles, etc.), good alkali resistance (no phenomena such as bleaching, bubbles, etc.), salt resistance is 13 ~ 21 cycles (preferably 20 ~ 21 cycles , 1 cycle is the time to continuously boil by heating 5% by weight of brine for 8 hours to maintain 80 degrees for 16 hours, etc. In addition, the non-stick coating layer still has excellent wettability inside even after the surface has been worn and damaged. And the wettability is maintained well as long as the base member is not exposed (the PTFE non-stick coating layer, the ceramic non-stick coating layer and the non-stick coating layer of the present invention were tested for friction damage on the three samples. Stick coating layer is only partially damaged during friction While falling into the powder form and not affecting the performance, both the PTFE non-stick coating layer and the ceramic non-stick coating layer were peeled off in a sheet form, showing a relatively large difference). In addition, the non-stick coating layer meets food hygiene certification since it may be in direct contact with food.

Method 2

According to the second embodiment of the present invention, as shown in FIGS. 5 to 8, the present invention provides a cookware including a base member 2 and a non-stick coating layer 1 formed on the base member 2. The non-stick coating layer 1 is an integrated layer of the particulate material 10 having a flat structure. The particulate material 10 includes a ceramic particle core 11 and a fluororesin material coating layer 12 covering the outer peripheral surface of the ceramic particle core 11.

The inventors of the present invention have conducted many studies on raw materials and forming methods of the non-stick coating layer in order to improve the performance of the non-stick coating layer. What I found during the study were ceramic powders and fluororesin powders, both of which have advantages. If both are combined to produce a non-stick coating layer, there is a possibility of improving the overall effect of the non-stick coating layer. Based on this purpose, the inventors have found that the fluororesin material has a relatively low melting point and is easily atomized when heated in the course of further research. After the fluororesin material is atomized, molten particles of ceramic particles pass through the atomized material of the fluororesin material and strike the surface of the base member again, thereby forming coated particles covering the ceramic particles with the fluororesin material. have. The particle aggregation layer (nonstick coating layer of the present invention) formed of these coated particles has a relatively high hardness since it contains ceramic particles in the coated particles, and also has excellent functional properties since the surface of the coated particles is coated with a fluororesin material. For example, it has a minority non-stick property (the wetting angle of the surface of the coating layer is large). At the same time, it is advantageous to significantly increase the bonding strength of the non-stick coating layer by forming the non-stick coating layer in a special manner such as plasma spray coating. In addition, by combining specified devices and processes, the scratch resistance, corrosion resistance, and the density (low porosity of the coating layer) and the service life of the non-stick coating layer can be simultaneously improved.

Preferably, the particulate material 10 has a flat structure, and the thickness direction of each particulate material is basically perpendicular to the plane where the non-stick coating layer 1 is located.

Preferably, it comprises 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the non-stick coating layer.

Preferably, the particle material 10 has a thickness of 1 to 10 μm, and the maximum cross-sectional diameter perpendicular to the thickness direction of the particle material is 50 to 120 μm.

Preferably, the thickness of one side of the fluororesin material coating layer 12 is 0.2 to 2 μm.

Preferably, the ceramic particles in the ceramic particle core 11 are aluminum oxide and / or titanium oxide.

Preferably, the fluororesin material in the fluororesin material coating layer 12 is PTFE and / or PFA.

Preferably, the thickness of the non-stick coating layer (1) is 50 ~ 2000㎛, more preferably 100 ~ 300㎛.

Preferably, the non-stick coating layer 1 is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer (1) is (1) pre-treated with respect to the base member, (2) selectable pre-heat treatment to the surface of the base member obtained in the procedure (1), (3) ceramic powder and fluoro It includes the steps of forming a non-stick coating layer on the surface of the base member through a plasma spray coating treatment using a resin powder as a raw material. Here, in the procedure of the plasma spray coating process, a plasma stem is used to form a flame stem, and among the formed flame stems, ceramic powder is introduced at a distance D1 from the outlet of the sprayer and a fluororesin powder at a distance D2 from the outlet of the sprayer Input. Here, D2 is greater than D1.

According to the second embodiment of the invention, preferably 1/6 ≤ D2 to D1 ≤ 1/2 of the flame stem length, more preferably 1/4 ≤ D2 to D1 ≤ flame length of the flame stem It is 1/3 of the stem length, where the flame stem length is preferably 14 to 18 cm.

According to the second embodiment of the present invention, preferably, in the plasma spray coating process, the spray power is 30-50 kW, the spray current is 600-650 A, and the main gas (eg, argon) in the working gas The flow rate of gas) is 35 to 55 L / min and the flow rate of auxiliary gas (for example, hydrogen gas) is 2 to 6 L / min; The D1 is 1/4 to 1/3 of the length of the flame stem, and the D2 is 1/2 to 2/3 of the length of the flame stem. More preferably, in the plasma spray coating process, the spray power is 35 to 55 kW, the spray current is 620 to 630 A, the flow rate of the main gas in the working gas is 40 to 50 L / min, and the flow rate of the auxiliary gas is 3 It is ~ 5L / min.

Preferably, the spray angle in the procedure of the plasma spray coating treatment is 70-90 °.

According to the second embodiment of the present invention, preferably, in the procedure of the plasma spray coating treatment, the spray distance is 60 to 100 mm, preferably 75 to 85 mm, and the sprayer moving speed is 60 to 100 mm / s, preferably It is 75 ~ 85mm / s.

According to the second embodiment of the present invention, preferably, the input amount of the ceramic powder is 3.5 to 5 g / min, and the input amount of the fluororesin powder is 2.5 to 3.5 g / min. In the plasma spray coating process, a part of the fluororesin raw material is lost in the process of fluororesin particles being sprayed and attached to the surface of the ceramic particle core. When measured for a non-stick coating layer prepared using a chemical analysis method, the input amount It can be seen that the non-stick coating layer prepared by controlling the above range comprises 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the nonstick coating layer.

According to the second embodiment of the present invention, preferably, the particle size (D50) of the ceramic powder is 5 to 80 μm, preferably 20 to 50 μm, and fluidity is 10 to 30 s / 50 g. The particle size (D50) of the fluororesin powder is 20 to 100 μm, preferably 40 to 100 μm, more preferably 45 to 60 μm. The fluidity of the fluororesin powder is less than 30s / 50g, preferably 10-25s / 50g, more preferably 10-20s / 50g. Here, the particle size (D50) is the average diameter of the volume, and is the equivalent diameter of the largest particle when the cumulative distribution is 50 vol% in the particle size distribution curve.

According to the second embodiment of the present invention, when selecting a fluororesin powder, if the fluidity of the fluororesin powder sold in the market does not meet the demand, the fluororesin powder is denatured to have a fluidity that meets the needs. Fluoro resin powder can be obtained. Preferably, the modified fluororesin powder is prepared by mixing (a) a fluoro resin powder, an adhesive, a lubricant, and water to prepare a paste, and (b) iron-carrier for spray drying the paste. Can be produced by.

Preferably, in the procedure (a), the content of the fluororesin powder based on the weight of the paste is 30 to 60% by weight, more preferably 38 to 55% by weight, and the adhesive content is 0.2 to 2% by weight, More preferably 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the water content is 35 to 68% by weight, more preferably 42 to 60% by weight to be.

Preferably, in the procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, the method of the spray drying treatment in procedure (b) is airflow spray drying. The conditions of the airflow spray drying are spray pressure of 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, and the flow rate of the spray airflow is 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h; The inlet temperature is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the second embodiment of the present invention, preferably, the ceramic powder is an aluminum oxide powder and / or titanium oxide powder, and the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene -Perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the second embodiment of the present invention, the method of pre-treatment of procedure (1) includes sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles (eg, sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.) at 60 to 150 mesh, and jet air pressure Is controlled at 0.2 to 0.9 MPa, and the roughness (Ra) obtained as described above is about 2 to 8 μm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the second embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 80 to 150 ° C, preferably 100 to 120 ° C.

According to the second embodiment of the present invention, the present invention further includes a non-stick coating layer prepared by the above method.

The method for manufacturing the non-stick coating layer of the second embodiment of the present invention is to inject ceramic powder and fluororesin powder to different positions of a flame stem formed in a plasma sprayer so that molten drops of ceramic particles are atomized materials of a fluororesin material. By passing through and hitting the surface of the base member, the ceramic particles form a particulate material coated on the fluororesin material, and the particulate material is deposited to form the non-stick coating layer of the present invention. The non-stick coating layer formed in this way has the following beneficial effects.

1) Since the particulate material in the formed non-stick coating layer simultaneously contains ceramic particles and a fluororesin material, it is possible to simultaneously secure the hardness and hydrogen non-stick properties of the non-stick coating layer.

2) In the process of forming the coating layer through plasma spray coating (that is, the process in which molten particles are accumulated), the coating layers are dense (small porosity) because the particles are all connected in a molten state. It is very sturdy (high bonding strength) and is much higher than the strength of the coating layer formed by air spraying and sintering after mechanically bonding to a rough surface through a high-speed molten particle between the non-stick coating layer and the base member.

In the formed non-stick coating layer, the particulate material has a structure in which ceramic particles are coated on a fluororesin material, so that the non-stick coating layer has excellent scratch resistance and corrosion resistance, which is advantageous for extending the service life of the non-stick coating layer.

The formed non-stick coating layer is formed by integrating a flat particulate material having a coating structure, so the structure from the inside to the outside is uniform and stable, and even if the surface is partially worn during use, the inner and outer layers are consistent, so the non-stick coating layer is still It can maintain performance such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and is advantageous for extending the service life of the coating layer.

Method 3

According to the third embodiment of the present invention, as shown in FIGS. 5 to 8 and 9, the cookware of the present invention includes a base member 2 and a non-stick coating layer 1 formed on the base member 2. The non-stick coating layer 1 is an integrated layer of the particulate material 10 having a flat structure. The particulate material 10 includes a ceramic particle core 11 and a fluororesin material coating layer 12 covering the outer peripheral surface of the ceramic particle core 11. The thickness D of the ceramic particle core 11 is distributed within a range of 1 to 10 μm, the lateral diameter R is distributed within a range of 50 to 400 μm, and 1/4 R²D is distributed within a range of 8000 to 40000 μm³.

The inventors of the present invention have conducted many studies on raw materials and forming methods of the non-stick coating layer in order to improve the performance of the non-stick coating layer. What I found during the study were ceramic powders and fluororesin powders, both of which have advantages. If both are combined to produce a non-stick coating layer, the overall effect of the non-stick coating layer can be improved. Based on this purpose, the inventors have found that the melting point of the fluororesin material is relatively low in the process of conducting a lot of research again and is easily atomized when heated. After the fluororesin material is atomized, molten particles of ceramic particles pass through the atomized material of the fluororesin material and strike the surface of the base member again, thereby forming coated particles covering the ceramic particles with the fluororesin material. have. It is possible to control the thickness and transverse area of the ceramic particle core in the coated particles formed by controlling the spraying power during the plasma spray coating process, the flow rate and spraying distance of the working gas, and the preheating temperature of the base member. The bonding strength and wettability of the particle accumulation layer (nonstick coating layer of the present invention) are further improved.

In the non-stick coating layer provided by the third embodiment of the present invention, the particle size of the particulate material can be measured through a scanning electron microscope. When measuring the size of each particulate material, the maximum value of the thickness of the ceramic particle core among the particulate materials is defined as the thickness (D), and the maximum value of the transverse diameter (the diameter of the cross section perpendicular to the thickness direction) is the transverse diameter (R ). In addition, when measuring the distribution range of the thickness (D) and the transverse diameter (R) of the ceramic particle core in the non-stick coating layer, randomly select 5 to 10 regions from the non-stick coating layer, and 10 to 20 regions for each region By measuring the particulate matter, the thickness of the particulate matter and the transverse diameter are calculated. If the range of thickness and transverse diameter of these particulate materials meets the above requirements, it is considered that the non-stick coating layer meets the above range needs.

Preferably, the average thickness D of the ceramic particle core 11 is distributed within a range of 2 to 5 μm, and the average transverse diameter R is distributed within a range of 80 to 280 μm.

Preferably, the thickness of one side of the fluororesin material coating layer 12 of the particulate material 10 is in the range of 0.2 to 2 μm. Here, the thickness of one side of the coating layer of the fluororesin material is also measured through a scanning electron microscope, and the maximum thickness of one side of the coating layer of the fluororesin material in each particulate material is determined as the thickness of one side of the particulate material. The thickness distribution of the coating layer of the fluororesin material in each particulate material in the non-stick coating layer is measured by the above measuring method.

Preferably, it comprises 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the non-stick coating layer (1).

Preferably, the ceramic material in the ceramic particle core 11 is aluminum oxide and / or titanium oxide.

Preferably, the fluororesin material in the fluororesin material coating layer 12 is PTFE and / or PFA.

Preferably, the thickness of the base member 2 is 0.5 to 6 mm.

Preferably, the thickness of the non-stick coating layer (1) is 50 ~ 2000㎛, more preferably 100 ~ 300㎛.

Preferably, the non-stick coating layer 1 is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer (1) is (1) pre-treated with respect to the base member, (2) the surface of the base member obtained in the procedure (1) is preheated to 80-150 ° C, (3) ceramic powder and fluorine It includes the steps of forming a non-stick coating layer on the surface of the base member through plasma spray coating treatment using raw resin powder as a raw material. Here, the particle size of the ceramic powder is distributed in the range of 35 ~ 65㎛ (preferably 40 ~ 60μm) (the flowability of the ceramic powder is 10 ~ 30s / 50g). The conditions of the plasma spray coating treatment are 30-50kW of spray power of the plasma atomizer, 500-650A of spray current, and 35 ~ 55L / min of the flow rate of the main gas (for example, argon gas) among working gases. The flow rate of the gas (for example, hydrogen gas) is 2 to 6 L / min, the spraying distance is 80 to 120 mm, and among the flame stems formed in the plasma sprayer, ceramic powder is introduced at a distance D1 from the outlet of the sprayer and the sprayer The fluororesin powder is added at a distance D2 from the exit. Here, D2 is greater than D1.

According to the third embodiment of the present invention, preferably, the particle size of the fluororesin powder is distributed in a range of 20 to 100 μm, preferably 40 to 100 μm, and more preferably 45 to 60 μm. The fluidity of the fluororesin powder is less than 30s / 50g, preferably 10-25s / 50g, more preferably 10-20s / 50g.

According to the third embodiment of the present invention, when selecting a fluororesin powder, if the fluidity of the fluororesin powder sold in the market does not meet the demand, the fluororesin powder is denatured to have a fluidity meeting the demand. Fluoro resin powder can be obtained. Preferably, the modified fluororesin powder is prepared by a method comprising (a) mixing a fluoro resin powder, an adhesive, a lubricant, and water to prepare a paste, and (b) spray drying the paste. .

Preferably, in the procedure (a), the content of the fluororesin powder based on the weight of the paste is 30 to 60% by weight, more preferably 38 to 55% by weight, and the adhesive content is 0.2 to 2% by weight, More preferably 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the water content is 35 to 68% by weight, more preferably 42 to 60% by weight to be.

Preferably, in the procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, the method of the spray drying treatment in procedure (b) is airflow spray drying. The conditions of the airflow spray drying are a spray pressure of 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, and the flow rate of the spray airflow is 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h, and the inlet The temperature is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the third embodiment of the present invention, preferably, the spray power of the plasma sprayer is 40-50 kW, preferably 40-45 kW, the spray current is 500-600 A, preferably 560-600 A, and the working gas The main gas flow rate is 40 to 50 L / min, the auxiliary gas flow rate is 3 to 5 L / min, and the spraying distance is 90 to 110 mm. Preferably, the spray angle in the procedure of the plasma spray coating treatment is 70-90 °.

According to the third embodiment of the present invention, preferably 1/6 ≤ D2 to D1 ≤ 1/2 of the flame stem length, more preferably 1/4 ≤ D2 to D1 ≤ the flame stem length. It is 1/3 of the flame stem length, more preferably, D1 is 1/4 to 1/3 of the flame stem length, and D2 is 1/2 to 2/3 of the flame stem length, wherein the flame stem length Is preferably 14 to 18 cm.

According to the third embodiment of the present invention, preferably, in the procedure of the plasma spray coating treatment, the sprayer moving speed is 60 to 100 mm / s, preferably 75 to 85 mm / s. The thickness of the non-stick coating layer is 50 to 2000 μm, more preferably 100 to 300 μm.

According to the third embodiment of the present invention, preferably, the input amount of the ceramic powder is 3.5 to 5 g / min, and the input amount of the fluororesin powder is 2.5 to 3.5 g / min. In the plasma spray coating process, a portion of the raw material of the fluoro resin is lost during the process in which the fluoro resin particles are atomized and attached to the surface of the ceramic particle core. When measured for the non-stick coating layer prepared using a chemical analysis method, the input amount It can be seen that the non-stick coating layer prepared by controlling the above range comprises 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the nonstick coating layer.

According to a third embodiment of the present invention, preferably, the ceramic powder is an aluminum oxide powder and / or titanium oxide powder, and the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene -Perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the third embodiment of the present invention, the method of pre-treatment of procedure (1) includes sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.), and the airflow pressure is It is controlled at 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the third embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 80 to 150 ° C, preferably 100 to 120 ° C.

According to the third embodiment of the present invention, the present invention further includes a non-stick coating layer obtained by the method.

The method of manufacturing the non-stick coating layer according to the third embodiment of the present invention is to inject the ceramic powder and the fluororesin powder into different positions of the flame stem formed in the plasma sprayer so that the melting drops of the ceramic particles are atomized into the fluororesin material. By passing through the material and hitting the surface of the base member, the ceramic particles form a particulate material coated on the fluororesin material, and the particulate materials are integrated to form the non-stick coating layer of the present invention. The non-stick coating layer formed in this way has the following beneficial effects.

1) In the process of forming the non-stick coating layer, by controlling the spraying power, the flow rate of the working gas and the spraying distance, the thickness (D) of the ceramic particle core (11) is distributed within a range of 1 to 10 μm and the lateral diameter (R) is 50 It is possible to form a ceramic particle core distributed within the range of ~ 400μm and 1 / 4R²D within the range of 8000 ~ 40000μm³, while maintaining the hardness of the coating layer while improving the bonding strength, porosity and wettability of the coating layer comprehensively.

2) Furthermore, the thickness of the fluororesin material in the nonstick coating layer can be further controlled by controlling the input position and the amount of the fluororesin material in the process of forming the nonstick coating layer, thereby optimizing the wettability of the nonstick coating layer.

3) In the formed non-stick coating layer, the particulate material has a structure in which ceramic particles are coated on a fluororesin material, so that the non-stick coating layer has excellent scratch resistance and corrosion resistance, which is advantageous for extending the service life of the non-stick coating layer.

4) Since the formed non-stick coating layer is formed by integrating a flat particulate material having a coating structure, the structure from the inside to the outside is uniform and stable, and even if the surface is partially worn in the process of use, the inner layer structure and the outer layer structure are consistent and still non-stick. It can maintain the performance of the coating layer such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and is advantageous for extending the service life of the coating layer.

Method 4

According to the fourth embodiment of the present invention, as shown in FIGS. 5 and 10 to 12, the cookware of the present invention includes a base member 2 and a non-stick coating layer 1 formed on the base member 2. . The non-stick coating layer 1 is an integrated layer of the particulate material 10. The particulate material 10 includes ceramic particles 14, fluororesin particles 15 and coated composite particles 13. The coated composite particle 13 includes a ceramic particle core 13a and a fluororesin material coating layer 13b covering the outer peripheral surface of the ceramic particle core.

The inventors of the present invention have conducted many studies on raw materials and forming methods of the non-stick coating layer in order to improve the performance of the non-stick coating layer. What I found during the study were ceramic powders and fluororesin powders, both of which have advantages. If both are combined to produce a non-stick coating layer, the overall effect of the non-stick coating layer can be improved. Based on this purpose, the inventor discovered in the course of conducting many studies over and over that first prepares a coatable powder by mixing a ceramic powder and a fluororesin powder, and then prepares a ceramic powder, a fluororesin powder, and a coatable powder. After mixing and forming a coating layer in which particles are interposed (interlaced) through a plasma spray coating process, the coating layer has better functional properties, for example, a small number of non-stick properties (the wet angle of the surface of the coating layer is large). do. At the same time, since the coating layer simultaneously includes ceramic particles, fluororesin particles, and a coatable powder, the hardness, density (low porosity), scratch resistance and corrosion resistance of the coating layer are improved overall. In addition, it is advantageous to significantly improve the bonding strength of the non-stick coating layer by forming a coating layer using a special method such as plasma spray coating.

According to the cookware, preferably, the particulate material 10 in the non-stick coating layer 1 has a flat structure and the thickness direction of each particulate material is basically in a plane where the non-stick coating layer 1 is located. Become vertical. It is advantageous to make the connection between the particulate materials more closely by making the particulate material 10 have a flat structure. This lowers the porosity of the non-stick coating layer, increases the density and improves the bonding force between the particulate materials. By allowing the particulate material 10 to have a flat structure, it increases the contact area between the particulate material and the base member surface and is advantageous in improving the mechanical bonding force between the non-stick coating layer and the base member, thereby improving the bonding strength of the coating layer.

According to the cookware, preferably, the ceramic particles 14, the fluororesin particles 15, and the coated composite particles 13 are integrated in a non-stick coating layer 1 in an interposed state. It is advantageous to improve the overall performance of the non-stick coating layer by not only improving the bonding strength between each particulate material by arranging and arranging three particles, but also more uniformly distributing each particulate material.

According to the cookware, preferably, the thickness of the particulate material 10 in the non-stick coating layer 1 is 1-10 μm, preferably 2-5 μm. The lateral diameter of the largest cross section perpendicular to the thickness direction of the particulate material is 30 to 500 μm, preferably 80 to 260 μm. By limiting the thickness of the particulate material and the transverse diameter, it is advantageous to limit the degree of flattening of the particulate material. Optimize.

According to the cookware, preferably, the thickness of one side of the fluororesin material coating layer 13b among the coated composite particles 13 of the non-stick coating layer 1 is 0.2 to 2 μm.

According to the cookware, preferably, the non-stick coating layer 1 is an integrated layer of particulate material formed through plasma spray coating. The non-stick coating layer is formed through a special method such as plasma spray coating. In the process of forming the non-stick coating layer using plasma spray coating (ie, the process of integrating molten particles), all the particles are connected together in a molten state. Therefore, the coating layer is dense (the porosity is small), and the bonding between the particles is strong (the bonding strength is high). Since the non-stick coating layer and the base member are mechanically bonded on a rough surface through high-speed molten particles, the bonding strength is much higher than the non-stick coating layer formed by sintering after gas spraying.

According to the cookware, preferably, based on the total weight of the non-stick coating layer 1, the non-stick coating layer 1 is 20 to 80% by weight of ceramic material and 20 to 80% by weight of fluororesin Contains ingredients. Preferably, the non-stick coating layer 1 includes 35 to 65% by weight of ceramic material and 35 to 65% by weight of fluororesin material.

According to the cookware, preferably, the ceramic material in the ceramic particle core 13a of the ceramic particle 14 and the coated composite particle 13 is aluminum oxide and / or titanium oxide. Preferably, the non-stick coating layer includes aluminum oxide and titanium oxide at the same time, and the weight ratio of aluminum oxide and titanium oxide is 1: (0.05 to 0.4). The fluororesin material of the fluororesin material coating layer 13b of the fluororesin particles 15 and the coated composite particles 13 are polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene-perfluoro It is an alkoxy oxy vinyl ether polymer (PFA).

According to the cookware, preferably, the thickness of the non-stick coating layer 1 is 50 to 2000 μm, more preferably 100 to 300 μm.

Preferably, the non-stick coating layer 1 is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer (1) is (1) pre-treated with respect to the base member, (2) the surface of the base member obtained in the procedure (1) is preheated to 80 to 150 ° C, (3) ceramic powder, fluorine It includes a procedure of forming a non-stick coating layer on the surface of the base member through plasma spray coating treatment using the powder mixture as a raw material by mixing the furnace resin powder and the coated composite powder. Here, the composite powder includes a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core.

According to the method of the present invention, preferably, the particle size of the coated composite powder is 0.2 to 2 μm larger than that of the ceramic, and the fluidity is similar to that of the ceramic powder and is about 10 to 30 s / 50 g.

According to the fourth embodiment of the present invention, preferably, the flowability of the ceramic powder is 10 to 30 s / 50 g, and the flowability of the fluororesin powder is 10 to 25 s / 50 g.

According to the fourth embodiment of the present invention, when selecting the fluororesin powder, if the fluidity of the fluororesin powder sold in the market does not meet the demand, the fluororesin powder is modified to obtain the fluidity that meets the needs. It is possible to obtain the fluororesin powder having. According to one preferably, the modified fluororesin powder is prepared by the following method: (a) a fluoro resin powder, an adhesive, a lubricant and water are mixed to prepare a paste, and (b) spray drying treatment for the paste. do. Here, based on the weight of the paste, the content of the fluororesin powder is 30 to 60% by weight, more preferably 38 to 55% by weight, the content of the adhesive is 0.2 to 2% by weight, more preferably 0.2 to 0.5 Weight percent, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the content of water is 35 to 68% by weight, more preferably 42 to 60% by weight.

Preferably, in the method for producing the modified fluororesin powder, the method of the spray drying treatment is airflow spray drying. The conditions of the air flow spray drying are the spray pressure is 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, the spray air flow rate is 0.5 to 4 m ³ / h, more preferably 0.5 to ³ m ³ / h, and the inlet temperature Is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the fourth embodiment of the present invention, preferably, the coated composite powder comprises (a) fluoro resin powder (marketed product or the modified fluororesin powder), ceramic powder, adhesive, lubricant and water. It is prepared by a method comprising mixing to prepare a paste, and (b) spray drying the paste. Here, based on the total weight of the paste, the content of the ceramic powder is 35 to 60% by weight, the content of the fluororesin powder is 5 to 10% by weight, the content of the adhesive is 0.2 to 2% by weight, the content of the lubricant Silver is 0.5 to 3% by weight, water content is 25 to 50% by weight.

Preferably, in the method of manufacturing the coated composite powder, the method of the spray drying treatment is airflow spray drying. The conditions of the air flow spray drying are the spray pressure is 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, the spray air flow rate is 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h, and the inlet temperature Is 300 to 450 ° C, more preferably 350 to 400 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

Preferably, in the method for producing the modified fluororesin powder and the coated composite powder, the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in the method for producing the modified fluororesin powder and the coated composite powder, the lubricant is at least one of glycerin, paraffin and graphite.

Here, in the spray-drying process in the manufacturing method of the coated composite powder, water, adhesives, lubricants, and additives are all volatilized in the 100 to 200 ° C section, and the ceramic powder is softened at a low temperature of 300 to 400 ° C. , The fluororesin powder is melted at 350 to 450 ° C. to be atomized, and after being atomized, it is deposited on the surface of the ceramic powder so that the surfaces between the powders can be combined into one to form a coated structure.

According to the fourth embodiment of the present invention, here, the particle size of the ceramic powder and the fluororesin powder can be distributed within a larger range. In the present invention, the particle size of the ceramic powder is preferably distributed in the range of 35 to 65 μm (preferably in the range of 40 to 60 μm), and the particle size of the fluororesin powder is in the range of 30 to 80 μm (preferably in the range of 35 to 75 μm) Is distributed within.

According to the fourth embodiment of the present invention, here, the conditions of the plasma spray coating treatment can be distributed within a wider range. Preferably, the conditions of the plasma spray coating treatment are as follows. The spray power of the plasma atomizer is 30 ~ 50kW, the spray current is 500 ~ 650A, the flow rate of the main gas (for example, argon gas) in the working gas is 35 ~ 55L / min, and the auxiliary gas (for example, hydrogen gas) The flow rate of) is 2 to 6 L / min, and the spraying distance is 80 to 120 mm. More preferably, the spray power of the plasma atomizer is 40-50 kW, more preferably 40-45 kW, the spray current is 500-600 A, more preferably 560-600 A, and the flow rate of the main gas in the working gas is 40 ~ 50L / min, auxiliary gas flow rate is 3 ~ 5L / min, spray distance is 90 ~ 110mm. Preferably, in the procedure of the plasma spray coating treatment, the spray angle is 70-90 °.

According to the fourth embodiment of the present invention, preferably, in the procedure of the plasma spray coating treatment, the sprayer moving speed is 60 to 100 mm / s, preferably 75 to 85 mm / s. The thickness of the non-stick coating layer is 50 to 2000 μm, more preferably 100 to 300 μm.

According to the fourth embodiment of the present invention, preferably, the input amount of the powder mixture is 3.5 to 10 g / min, preferably 5 to 7 g / min. Here, the powder mixture is introduced into a flame stalk formed in a plasma sprayer as a method of transferring from the outside, and a specific operation can be achieved according to a conventional input method of a plasma spray coating process.

According to the fourth embodiment of the present invention, preferably, the weight ratio of the fluororesin powder, the ceramic powder, and the coated composite powder in the powder mixture is 1: (2-6) :( 2-6), preferably Is 1: (3 ~ 5) :( 2.5 ~ 4).

According to the fourth embodiment of the present invention, preferably, the ceramic powder is aluminum oxide powder and / or titanium oxide powder, preferably aluminum oxide powder and titanium oxide powder. More preferably, the weight ratio of the aluminum oxide powder and the titanium oxide powder is 1: (0.05 to 0.4), and preferably 1: (0.1 to 0.25).

According to a fourth embodiment of the present invention, preferably, the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene-perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the fourth embodiment of the present invention, preferably, each powder is mixed for 1 to 2 hours and then stirred for 1 to 1.5 hours at 100 to 120 ° C. after plasma spray coating treatment.

According to the fourth embodiment of the present invention, the method of pretreatment of the procedure (1) may include sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.), and the airflow pressure is It is controlled at 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the fourth embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 100 to 120 ° C.

According to the fourth embodiment of the present invention, the present invention further includes a non-stick coating layer obtained by the method.

In the method of manufacturing the non-stick coating layer of the fourth embodiment of the present invention, a mixed powder of ceramic powder, fluororesin powder and coated composite powder is used as a spraying material. Through the plasma spray coating process, ceramic particles, fluororesin particles, and coated composite particles distributed between each other can be simultaneously formed. And these particles are integrated to form the non-stick coating layer of the present invention. The non-stick coating layer formed in this way has the following beneficial effects.

1) Since the ceramic particles, fluororesin particles, and coated composite particles are distributed among the formed non-stick coating layer, it is advantageous to extend the service life of the non-stick coating layer by making the non-stick coating layer have excellent scratch resistance and corrosion resistance. Do.

2) Since the fluororesin particles in the formed non-stick coating layer are relatively uniformly dispersed between the ceramic particles, the structure from the inside to the outside is uniform and stable, and the inner layer structure and the outer layer structure are consistent even if the surface is partially worn during use. Therefore, it is still possible to maintain the performance of the non-stick coating layer such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and furthermore, it is advantageous for extending the service life of the coating layer.

In addition, the cookware according to the fourth embodiment of the present invention and the cooking apparatus including the cookware are formed by integrating three different particulate materials such as ceramic particles, fluororesin particles, and coated composite particles in the cookware. Since a non-stick coating layer is provided, the non-stick coating layer in cookware has the following beneficial effects.

1) The non-stick coating layer simultaneously includes three different particulate materials such as ceramic particles, fluoro resin particles and coated composite particles, so that the non-stick coating layer has the hardness of the ceramic particles and the surface wetting angle of the fluoro resin particles at the same time, Furthermore, it is advantageous to improve the hydrophobic non-stick property (small surface wetting angle) while securing the hardness of the non-stick coating layer.

2) Since the non-stick coating layer is formed by the accumulation of particulate materials, the structure from the inside to the outside is uniform and stable, and even if the surface is partially worn during use, the inner layer structure and the outer layer structure are consistent, so the hardness of the non-stick coating layer is still high. It can maintain performance such as hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and is further advantageous for extending the service life of the coating layer.

Method 5

According to the fifth embodiment of the present invention, as shown in FIGS. 3 and 13, the present invention provides a cookware including a base member 2 and a non-stick coating layer 1 formed on the base member 2. . The non-stick coating layer 1 is an integrated layer of particulate material having a flat structure. The particulate material includes ceramic particles and fluororesin particles interspersed and distributed. The thickness (D) of the particulate material is 1 to 10 μm, the transverse diameter (R) is 40 to 530 μm, and the 1/4 R²D is 5000 to 70000 μm³.

The inventors of the present invention have conducted many studies on raw materials and forming methods of the non-stick coating layer in order to improve the performance of the non-stick coating layer. What I found during the study were ceramic powders and fluororesin powders, both of which have advantages. If both are combined to produce a non-stick coating layer, the overall effect of the non-stick coating layer can be improved. Based on this purpose, the inventor discovered in the course of further research that the size was specified through mixing the ceramic powder and the fluororesin powder, and then putting it in the plasma sprayer and controlling the parameters of the plasma spray coating process. It is possible to obtain a coating layer in which ceramic particles and fluororesin particles are interposed (adhered). This coating layer has better functional properties, for example, minority non-stick properties (the wetting angle of the coating layer surface is large). At the same time, since the coating layer simultaneously contains ceramic particles and fluororesin particles, the hardness, density (low porosity), scratch resistance and corrosion resistance of the coating layer are improved overall. In addition, it is advantageous to significantly improve the bonding strength of the non-stick coating layer by forming a coating layer using a special method such as plasma spray coating.

The particle size of the particulate material in the non-stick coating layer provided in the fifth embodiment of the present invention can be measured through a scanning electron microscope. When measuring the size of each particulate material, the maximum value of the thickness of the ceramic particle core among the particulate materials is defined as the thickness (D), and the maximum value of the transverse diameter (the diameter of the cross section perpendicular to the thickness direction) is the transverse diameter (R ). In addition, when measuring the distribution range of the thickness (D) and the transverse diameter (R) of the ceramic particle core in the non-stick coating layer, randomly select 5 to 10 regions from the non-stick coating layer, and 10 to 20 regions for each region By measuring the particulate matter, the thickness of the particulate matter and the transverse diameter are calculated. If the range of thickness and transverse diameter of these particulate materials meets the above requirements, it is considered that the non-stick coating layer meets the above range needs.

Preferably, the thickness (D1) of the ceramic particles is 2 to 5 μm, and the lateral diameter (R1) is 80 to 280 μm. The thickness (D2) of the fluororesin particles is 1 to 5 μm, the lateral diameter (R2) is 60 to 500 μm, and the 1/4 R²D is 5000 to 70000 μm³.

Preferably, the weight ratio of the fluororesin particles and the ceramic particles in the non-stick coating layer is 1: (2-6), more preferably 1: (3-5).

Preferably, the ceramic particles are aluminum oxide and / or titanium oxide, more preferably aluminum oxide and titanium oxide, and more preferably, the weight ratio of aluminum oxide and titanium oxide is 1: (0.05 to 0.4).

Preferably, the fluororesin material in the fluororesin particles is PTFE and / or PFA.

Preferably, the thickness of the base member is 0.5 to 6 mm.

Preferably, the thickness of the non-stick coating layer is 50 to 2000 μm, more preferably 100 to 300 μm.

Preferably, the non-stick coating layer is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer is (1) pre-treated with respect to the base member, (2) pre-heated to 80 to 150 ° C on the surface of the base member obtained in the procedure (1), (3) ceramic powder and fluoro And mixing the resin powder to obtain a powder mixture and using the powder mixture as a raw material to form a non-stick coating layer on the surface of the base member through plasma spray coating. Here, the particle size of the ceramic powder is distributed in the range of 35 to 65 μm (preferably in the range of 40 to 60 μm), and the particle size of the fluororesin powder is in the range of 30 to 80 μm (preferably in the range of 35 to 75 μm). The conditions of the plasma spray coating treatment are 30-50kW of spray power of the plasma atomizer, 500-650A of spray current, and 35 ~ 55L / min of the flow rate of the main gas (for example, argon gas) among working gases. The flow rate of gas (for example, hydrogen gas) is 2 to 6 L / min, and the spraying distance is 80 to 120 mm.

According to the fifth embodiment of the present invention, preferably, the flowability of the ceramic powder is 10 to 30 s / 50 g, and the flowability of the fluororesin powder is 10 to 25 s / 50 g.

According to the fifth embodiment of the present invention, when selecting a fluororesin powder, if the fluidity of the fluororesin powder sold in the market does not meet the demand, the fluororesin powder is denatured to have a fluidity meeting the demand. Fluoro resin powder can be obtained. In one preferred case, the modified fluororesin powder is prepared by a method comprising (a) mixing a fluoro resin powder, an adhesive, a lubricant, and water to prepare a paste, and (b) spray drying the paste. do.

Preferably, in the procedure (a), based on the weight of the paste, the content of the fluororesin powder is 30-60% by weight, more preferably 38-55% by weight, and the adhesive content is 0.2-2% by weight , More preferably 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the water content is 35 to 68% by weight, more preferably 42 to 60% by weight %to be.

Preferably, in the procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, the method of the spray drying treatment in procedure (b) is airflow spray drying. The conditions of the airflow spray drying are the spray pressure of 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, the flow rate of the spray airflow is 0.5 to 4 m ³ / h, more preferably 0.5 to ³ m ³ / h, and the inlet The temperature is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the fifth embodiment of the present invention, preferably, the spray power of the plasma atomizer is 40-50 kW, preferably 40-45 kW, the spray current is 500-600 A, preferably 560-600 A, and the working gas The main gas flow rate is 40 to 50 L / min, the auxiliary gas flow rate is 3 to 5 L / min, and the spraying distance is 90 to 110 mm. Preferably, the spray angle in the procedure of the plasma spray coating treatment is 70-90 °.

According to the fifth embodiment of the present invention, preferably, in the procedure of the plasma spray coating treatment, the sprayer moving speed is 60 to 100 mm / s, preferably 75 to 85 mm / s. The thickness of the non-stick coating layer is 50 to 2000 μm, more preferably 100 to 300 μm.

According to the fifth embodiment of the present invention, preferably, the input amount of the powder mixture is 3.5 to 10 g / min, preferably 5 to 7 g / min. Here, the powder mixture is introduced into the flame stem formed in the plasma sprayer in a manner that is input from the outside, and specific self-support can refer to a conventional injection method of the plasma spray coating process.

According to the fifth embodiment of the present invention, preferably, the weight ratio of the fluororesin powder and the ceramic powder in the powder mixture is 1: (2 to 6), more preferably 1: (3 to 5). .

According to the fifth embodiment of the present invention, preferably, the ceramic powder is aluminum oxide powder and / or titanium oxide powder, more preferably aluminum oxide powder and titanium oxide powder, more preferably aluminum oxide powder and The weight ratio of the titanium oxide powder is 1: (0.05 to 0.4), and even more preferably 1: (0.2 to 0.25).

According to a fifth embodiment of the present invention, preferably, the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene-perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the fifth embodiment of the present invention, preferably, each powder is mixed before plasma spray coating treatment, stirred for 1 to 2 hours, and then dried at 100 to 120 ° C for 1 to 1.5 hours.

According to the fifth embodiment of the present invention, the method of pretreatment of procedure (1) may include sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.), and the airflow pressure is It is controlled at 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the fifth embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 100 to 120 ° C.

According to the fifth embodiment of the present invention, the present invention further includes a non-stick coating layer obtained by the method.

The method for manufacturing the non-stick coating layer of the fifth embodiment of the present invention is a powder mixture of a ceramic powder and a fluororesin powder as a raw material, and a plasma spray coating process is used to insert ceramic powders and fluorine particles sandwiched between each other. The resin particles can be simultaneously formed, and the non-stick coating layer of the present invention is formed by integrating the particles. The non-stick coating layer formed in this way has the following beneficial effects.

1) The average thickness (D) is 1 to 10㎛, the average lateral diameter (R) is 80 to 300㎛, and 1 / 4R²D is controlled by controlling the spraying power, the flow rate of the working gas, and the spraying distance in the process of forming the non-stick coating layer. It can form 5000 ~ 70000μm³ flat particles, while maintaining the hardness of the coating layer while improving the bonding strength, porosity and wettability of the coating layer comprehensively.

2) Among the formed non-stick coating layer, since the fluororesin particles are sandwiched between ceramic particles, the non-stick coating layer has excellent scratch resistance and corrosion resistance, and furthermore, it is advantageous for extending the service life of the non-stick coating layer.

3) Since the fluororesin particles are relatively uniformly dispersed among the ceramic particles in the formed non-stick coating layer, the structure of the formed non-stick coating layer is uniform and stable from inside to outside, and the inner layer structure even if the surface is partially worn during use And the outer layer structure are consistent, so it is still possible to maintain the performance of the non-stick coating layer such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and furthermore, it is advantageous for extending the service life of the coating layer.

Method 6

According to a sixth embodiment of the present invention, as shown in FIG. 5, the present invention provides a cookware including a base member 2 and a non-stick coating layer 1 formed on the base member 2. Here, the non-stick coating layer 1 includes ceramic particles and fluororesin particles dispersed between the ceramic particles. And, based on the total weight of the non-stick coating layer, 80 to 95% by weight of ceramic powder and 5 to 20% by weight of fluoro polyester powder.

The inventors of the present invention have conducted many studies on raw materials and forming methods of the non-stick coating layer in order to improve the performance of the non-stick coating layer. What I found during the study were ceramic powder and fluoro polyester powder, both of which have advantages. If both are combined to produce a non-stick coating layer, the overall effect of the non-stick coating layer can be improved. Based on this purpose, the inventors have found that the melting point of the fluoro polyester material is relatively low and easily atomized when heated in the course of further research. After the fluoro polyester material has been atomized, molten droplets of ceramic particles pass through the atomized material of the fluoro polyester material, so that the material in the atomized state of the fluoro polyester material can adhere to the surface of the ceramic particles. . As a result, even when the amount of the fluoro polyester material is small, it can be relatively uniformly distributed on the surface of the ceramic particles, so that the ceramic particles are integrated to maintain the hardness of the non-stick coating layer, and at the same time, the functional properties of the non-stick coating layer, For example, it improves the hydrophobic non-stick property (the wetting angle of the coating layer surface is large). At the same time, it is advantageous to significantly increase the bonding strength of the non-stick coating layer to form a non-stick coating layer in a special manner such as plasma spray coating. In addition, by combining specified devices and processes, it is possible to simultaneously improve the scratch resistance, corrosion resistance, density of the coating layer (low porosity), and service life of the non-stick coating layer.

Preferably, the ceramic particles include aluminum oxide particles and / or titanium oxide particles, more preferably a mixture of aluminum oxide particles and titanium oxide particles, and more preferably the aluminum oxide particles and the titanium oxide The weight ratio of the particles is (2.5 to 10): 1.

Preferably, the fluororesin powder is PTFE and / or PFA.

Preferably, the non-stick coating layer 1 is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer (1) is (1) pre-treated with respect to the base member, (2) selectable pre-heat treatment to the surface of the base member obtained in the procedure (1), (3) ceramic powder and fluoro And forming a non-stick coating layer on the surface of the base member by performing plasma spray coating treatment using the resin powder as a raw material. Here, in the plasma spray coating process, a flame stem is formed using a plasma sprayer, ceramic powder is introduced at a distance D1 from the outlet of the sprayer among the formed flame stems, and a fluororesin powder is placed at a distance D2 from the outlet of the sprayer Input. Here, D2 is larger than D1, and the weight ratio of the amount of the fluororesin powder to the amount of the ceramic powder is (0.14 to 0.3): 1.

The method provided in the sixth embodiment of the present invention is based on the total weight of the ceramic powder and the fluoro polyester (Fluorinated polyeste) powder in the non-stick coating layer formed by controlling the proportion of the input amount of the ceramic powder and the fluoro resin powder The content of the ceramic powder is 80 to 95% by weight, and the content of the fluoro polyester powder is advantageous to be 5 to 20% by weight. Although a fluororesin was added in the formed non-stick coating layer, the content of the fluororesin material is relatively small and still ceramic particles are the main material. Therefore, the formed non-stick coating layer can more easily implement the hardness characteristics of the ceramic particles. At the same time, the content of the fluoro polyester material in the formed non-stick coating layer is relatively small, but since the fluoro resin material can be uniformly dispersed on the surface of the ceramic particles through a special method, the wetting angle of the surface of the formed non-stick coating layer is large. And the minority non-stick property of the non-stick coating layer is improved. In addition, it is advantageous to improve the scratch resistance and corrosion resistance of the non-stick coating layer, and furthermore, to extend the service life of the non-stick coating layer.

According to the sixth embodiment of the present invention, preferably, 1/6 ≤ D2 to D1 ≤ 1/2 of the flame stem length of the flame stem length, and more preferably 1/4 ≤ D2 to the flame stem length. D1 ≤ 1/3 of the flame stem length. Here, the flame stem length is preferably 14 to 18 cm.

According to the sixth embodiment of the present invention, preferably, in the plasma spray coating process, the spray power is 30-50 kW, the spray current is 600-650 A, and the main gas (eg, argon gas) in the working gas. The flow rate of 35 ~ 55L / min, the auxiliary gas (e.g., hydrogen gas) flow rate of 2 ~ 6L / min, the D1 is 1/4 ~ 1/3 of the flame stem length, the D2 is the It is 1/2 to 2/3 of the length of the flame stem. More preferably, in the plasma spray coating process, the spray power is 35 to 45 kW, the spray current is 620 to 630 A, the flow rate of the main gas in the working gas is 40 to 50 L / min, and the flow rate of the auxiliary gas is 3 to It is 5L / min.

Preferably, in the plasma spray coating treatment procedure, the spray angle is 70-90 °.

According to the sixth embodiment of the present invention, preferably, in the plasma spray coating process, the spraying distance is 60 to 100 mm, preferably 75 to 85 mm, and the sprayer moving speed is 60 to 100 mm / s, preferably It is 75 ~ 85mm / s.

According to the sixth embodiment of the present invention, preferably, the input amount of the ceramic powder is 5 to 7 g / min, and the input amount of the fluororesin powder is 1 to 1.5 g / min. In the plasma spray coating process, a part of the fluororesin raw material is lost in the process of fluororesin particles being sprayed and attached to the surface of the ceramic particle core, but when measured for a non-stick coating layer prepared using a chemical analysis method, the input amount is It can be seen that the non-stick coating layer produced by controlling within the above range includes 80 to 95% by weight of ceramic powder and 5 to 20% by weight of fluoro polyester powder based on the total weight of itself.

According to the sixth embodiment of the present invention, preferably, the particle size (D50) of the aluminum oxide is 5 to 80 μm, preferably 20 to 50 μm, and fluidity is 10 to 30 s / 50 g. The particle size (D50) of the fluororesin powder is 20 to 100 μm, preferably 40 to 100 μm, more preferably 45 to 60 μm. The fluidity of the fluororesin powder is less than 30s / 50g, preferably 10-25s / 50g, more preferably 10-20s / 50g. Here, the particle size (D50) is the average diameter of the volume, and is the equivalent diameter of the largest particle when the cumulative distribution is 50 vol% in the particle size distribution curve.

According to the sixth embodiment of the present invention, when selecting a fluororesin powder, if the fluidity of the fluororesin powder sold in the market does not meet the demand, the fluororesin powder is denatured to have a fluidity meeting the demand. Fluoro resin powder can be obtained. In one preferred scenario, the modified fluororesin powder is prepared by a method comprising (a) mixing a fluoro resin powder, an adhesive, a lubricant, and water to prepare a paste, and (b) spray drying the paste. do.

Preferably, in the procedure (a), the content of the fluororesin powder based on the weight of the paste is 30 to 60% by weight, more preferably 38 to 55% by weight, and the adhesive content is 0.2 to 2% by weight, More preferably 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the water content is 35 to 68% by weight, more preferably 42 to 60% by weight to be.

Preferably, in the procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, the method of the spray drying treatment in procedure (b) is airflow spray drying. The conditions of the airflow spray drying are a spray pressure of 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, and a flow rate of the spray airflow is 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h, and the inlet The temperature is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to a sixth embodiment of the invention, preferably, the ceramic powder is an aluminum oxide powder and / or titanium oxide powder, preferably a mixture of aluminum oxide powder and titanium oxide powder, more preferably the aluminum oxide The weight ratio of the powder and the titanium oxide powder is (2.5 to 10): 1.

According to a sixth embodiment of the invention, preferably, the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene-perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the sixth embodiment of the present invention, preferably, the method of pre-treatment of the procedure (1) may include sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.), and the airflow pressure is It is controlled at 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the sixth embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 80 to 150 ° C.

According to the sixth embodiment of the present invention, the present invention further includes a non-stick coating layer obtained by the method.

In the method for manufacturing the non-stick coating layer of the sixth embodiment of the present invention, the ceramic powder and the fluororesin powder are injected into different positions of the flame stem formed in the plasma sprayer so that the melting drops of the ceramic particles are atomized materials of the fluororesin material. By passing through and hitting the surface of the base member, ceramic particles are formed to cover the fluororesin material. And this particulate material is integrated to form the non-stick coating layer of the present invention. The non-stick coating layer formed in this way has the following beneficial effects.

1) Fluoro resin is added to the formed non-stick coating layer, but since the content of the fluoro resin material is relatively small, the ceramic particles are still the main material, so the formed non-stick coating layer can more easily implement the hardness characteristics of the ceramic particles.

2) Although the content of the fluoro polyester material in the formed non-stick coating layer is relatively small, it is possible to uniformly disperse the fluoro resin material on the surface of the ceramic particles through a special method, so that the wetting angle of the surface of the formed non-stick coating layer becomes large. And the minority non-stick property of the non-stick coating layer is improved. In addition, it is advantageous to improve the scratch resistance and corrosion resistance of the non-stick coating layer, and further to extend the service life of the non-stick coating layer.

3) In the process of forming a coating layer through plasma spray coating (that is, the process of integrating molten particles), the coating layers are dense (small porosity), and are bonded between particles because they are all connected in a molten state. This is very strong (high bonding strength), and is mechanically bonded to a rough surface through a high-speed molten particle between the non-stick coating layer and the base member, and has much higher strength than the coating layer formed by air spraying and sintering.

4) Since the formed non-stick coating layer is formed by integrating particulate materials having basically the same flat structure, the structure from inside to outside of the non-stick coating layer is uniform and stable, and the inner layer is used even if the surface is partially worn during use. The structure and the outer layer structure are consistent, so it is still possible to maintain the performance of the non-stick coating layer such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc., and is advantageous for extending the service life of the coating layer.

Method 7

According to a seventh embodiment of the present invention, as shown in FIGS. 5, 15 and 17, the present invention provides a cookware including a base member 2 and a non-stick coating layer 1 formed on the base member 2 do. Here, the non-stick coating layer 1 includes a fluororesin material layer 16 and ceramic particles 17 dispersed inside the fluororesin material layer 16.

Preferably, the ceramic particles 17 have a flat structure.

Preferably, the thickness of the ceramic particles 17 is 1 ~ 10㎛, the lateral diameter is 50 ~ 200㎛.

The particle size of the particulate material in the non-stick coating layer provided in the seventh embodiment of the present invention can be measured through a scanning electron microscope. When measuring the size of each particulate material, the maximum value of the thickness of the ceramic particles in the particulate material is determined as the corresponding thickness, and the maximum value of the diameter of the cross section perpendicular to the thickness direction is determined as the transverse diameter. In addition, when measuring the distribution range of the thickness and transverse diameter of the ceramic particle core in the non-stick coating layer, 5 to 10 regions are randomly selected from the non-stick coating layer, and 10 to 20 particulate materials are measured for each region. The thickness of the particulate matter and the transverse diameter are determined. If the range of thickness and transverse diameter of these particulate materials meets the above requirements, it is considered that the non-stick coating layer meets the above range needs.

Preferably, it comprises 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the non-stick coating layer (1).

Preferably, the ceramic material in the ceramic particles 17 is aluminum oxide and / or titanium oxide, preferably aluminum oxide and titanium oxide. More preferably, the weight ratio of aluminum oxide and titanium oxide is 1: (0.05 to 0.4).

Preferably, the fluororesin material in the fluororesin material layer 16 is PTFE and / or PFA.

Preferably, the thickness of the base member 2 is 0.5 to 6 mm.

Preferably, the thickness of the non-stick coating layer (1) is 50 ~ 2000㎛, more preferably 100 ~ 300㎛.

Preferably, the non-stick coating layer 1 is a non-stick coating layer prepared by the following method.

The manufacturing method of the non-stick coating layer (1) is (1) pre-treated with respect to the base member, (2) selectable pre-heat treatment to the surface of the base member obtained in the procedure (1), (3) ceramic powder and fluoro It includes the steps of forming a composite coating layer on the surface of the base member through the plasma spray coating treatment using the resin powder as a raw material, and (4) heat treatment on the composite coating layer formed on the surface of the base member to form a non-stick coating. Here, the heat treatment temperature is 0 to 50 ° C greater than the melting point of the fluororesin.

According to the seventh embodiment of the present invention, preferably, the heat treatment temperature is 0 to 30 ° C greater than the melting point of the fluororesin, and the heat treatment time is 5 to 30 minutes.

According to the seventh embodiment of the present invention, in order to ensure that the ceramic particles and the fluoro powder are relatively uniformly distributed in the composite coating layer formed through plasma spray coating, preferably, the plasma sprayer in the plasma spray coating process In the flame stem formed in, the ceramic powder is placed at a distance D1 from the outlet of the sprayer and the fluororesin powder is added at a distance D2 from the outlet of the sprayer. Here, D2 is greater than D1.

The inventors of the present invention have conducted many studies on the plasma spray coating process, and as a result, the melting point of the fluororesin material is lower than the melting point of the ceramic particles, and the fluororesin material becomes molten drops at a heating temperature higher than the melting point, and is even atomized. . After the fluororesin material is atomized, the molten particles of the ceramic particles pass through the atomized material of the fluororesin material and again hit the surface of the base member, whereby the ceramic particles can form coated particles that cover the resin material with fluoro. . These coated particles may be integrated to form a composite coating layer having a structure shown in FIG. 14 (where 16 'is a fluororesin material coating layer and 17' is ceramic particles). At this time, the composite coating layer having such a structure is heat-treated to melt the fluororesin materials together, thereby removing the boundary of the fluororesin material to form a fluororesin material layer. As a result, a non-stick coating layer having the structure shown in FIG. 15 (where 16 is a fluororesin material layer and 17 'is ceramic particles) can be formed.

Preferably, 1/6 ≤ D2 to D1 ≤ 1/2 of the flame stem length of the flame stem length, more preferably 1/4 ≤ D2 to D1 ≤ 1/3 of the flame stem length, The D1 is 1/4 to 1/3 of the length of the flame stem, and the D2 is 1/2 to 2/3 of the length of the flame stem.

Preferably, the input amount of the ceramic powder is 3.5 to 5 g / min, and the input amount of the fluororesin powder is 2.5 to 3.5 g / min. In the plasma spray coating process, a part of the fluororesin raw material is lost in the process of fluororesin particles being melted and / or atomized and attached to the surface of the ceramic particle core, but measured for a non-stick coating layer prepared using a chemical analysis method If it is, it can be seen that the coating layer prepared by controlling the input amount within the above range includes 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of itself.

According to the seventh embodiment of the present invention, in order to ensure that the ceramic particles and the fluororesin particles are relatively uniformly distributed in the composite coating layer formed through plasma spray coating, in another preferred case, the ceramic powder in the plasma spray coating process And a fluororesin powder are mixed to obtain a powder mixture, and plasma spray coating is performed using the powder mixture as a raw material.

The inventors of the present invention have done a lot of research on the plasma spray coating process. As a result, the ceramic particles and the fluororesin particles shown in FIG. 16 are mixed in the process of mixing the ceramic powder and the fluororesin powder into the flame stem formed in the plasma sprayer. A composite coating layer (16 "for fluororesin particles and 17" for ceramic particles) can be obtained by agglutinating and distributing (distributing each other). At this time, by performing heat treatment on the composite coating layer having such a structure, the fluororesin materials are melted together to remove the boundary of the fluororesin material to form a fluororesin material layer. As a result, a non-stick coating layer having the structure shown in FIG. 17 (where 16 is a fluororesin material layer and 17 'is ceramic particles) can be formed.

Preferably, the weight ratio of the fluororesin powder and the ceramic powder in the powder mixture is 1: (2 to 6), more preferably 1: (3 to 5). When measured for the non-stick coating layer prepared using a chemical analysis method, the weight ratio of the fluororesin particles and the ceramic particles in the non-stick coating layer prepared by controlling the input amount to the above range is 1: (2-6), more preferably You can see that it is 1: (3 ~ 5).

Preferably, the input amount of the powder mixture is 3.5 to 10 g / min, preferably 5 to 7 g / min.

Preferably, after each powder is mixed before plasma spray coating treatment, the mixture may be stirred for 1 to 2 hours, and then dried at 100 to 120 ° C for 1 to 1.5 hours.

According to the seventh embodiment of the present invention, preferably, the particle size (D50) of the ceramic powder is 5 to 80 μm, preferably 30 to 70 μm, and fluidity is 10 to 30 s / 50 g. The particle size (D50) of the fluororesin powder is 20 to 100 μm, preferably 40 to 100 μm, more preferably 45 to 60 μm. The fluidity of the fluororesin powder is less than 30s / 50g, preferably 10-25s / 50g, more preferably 10-20s / 50g.

According to the seventh embodiment of the present invention, when selecting a fluororesin powder, if the fluidity of a commercially available fluororesin powder does not meet the demand, the fluororesin powder is denatured to have a fluidity that meets the demand. A resin powder can be obtained. Preferably, the modified fluororesin powder is prepared by a method comprising (a) mixing a fluoro resin powder, an adhesive, a lubricant, and water to prepare a paste, and (b) spray drying the paste.

Preferably, in the procedure (a), the content of the fluororesin powder based on the weight of the paste is 30 to 60% by weight, more preferably 38 to 55% by weight, and the adhesive content is 0.2 to 2% by weight, More preferably 0.2 to 0.5% by weight, the content of the lubricant is 0.5 to 3% by weight, more preferably 1 to 3% by weight, the water content is 35 to 68% by weight, more preferably 42 to 60% by weight to be.

Preferably, in the procedure (a), the adhesive is at least one of vinyl alcohol, polyvinyl alcohol and polyacrylic ester.

Preferably, in procedure (a), the lubricant is at least one of glycerin, paraffin and graphite.

Preferably, the method of the spray drying treatment in procedure (b) is airflow spray drying. The conditions of the air flow spray drying are the spray pressure is 0.3 to 0.6 MPa, more preferably 0.3 to 0.5 MPa, the flow rate of the spray air flow is 1 to 4 m ³ / h, more preferably 1 to ³ m ³ / h, and the inlet The temperature is 200 to 400 ° C, more preferably 300 to 350 ° C, and the air outlet temperature is 50 to 200 ° C, more preferably 50 to 150 ° C.

According to the seventh embodiment of the present invention, the conditions of the plasma thermal spray coating treatment can refer to typical process parameters of the plasma thermal spray coating. However, in order to increase the bonding strength of the non-stick coating layer by improving the degree of flattening of the ceramic particles in the composite coating layer, preferably, the conditions of the plasma spray coating treatment is 30-50 kW of the spraying power of the plasma sprayer, spraying The current is 500 ~ 650A, the flow rate of the main gas in the working gas is 35 ~ 55L / min, the flow rate of the auxiliary gas is 2 ~ 6L / min, and the spraying distance is 80 ~ 120mm. More preferably, the spray power of the plasma atomizer is 35 to 45 kW, the spray current is 560 to 630 A, and more preferably 580 to 620 A, and the flow rate of the main gas in the working gas is 40 to 50 L / min and the flow rate of the auxiliary gas Is 3 to 5 L / min, and the spraying distance is 90 to 110 mm.

According to the seventh embodiment of the present invention, preferably, in the procedure of the plasma spray coating treatment, the sprayer moving speed is 60 to 100 mm / s, preferably 75 to 85 mm / s. The thickness of the non-stick coating layer is 50 to 2000 μm, more preferably 100 to 300 μm.

According to the seventh embodiment of the present invention, preferably, in the plasma spray coating treatment procedure, the spray angle is 70 to 90 °.

According to the seventh embodiment of the present invention, preferably, the ceramic powder is aluminum oxide and / or titanium oxide, and more preferably aluminum oxide and titanium oxide powder. More preferably, the weight ratio of aluminum oxide and titanium oxide is 1: (0.05 to 0.4).

According to a seventh embodiment of the invention, preferably, the fluororesin powder is polytetrafluoroethylene (PTFE) and / or tetrafluoroethylene-perfluoroalkoxy oxy vinyl ether polymer (PFA). Preferably, the melting point of the fluororesin powder is 350 to 420 ° C, more preferably 400 to 420 ° C.

According to the seventh embodiment of the present invention, the method of pre-treatment of the procedure (1) may include sand blasting treatment and degreasing treatment. The sand blasting treatment and the degreasing treatment are not particularly limited, and each is a conventional method in the art. For example, the sand-plating treatment uses sand particles of 60 to 150 mesh (e.g., sand for glass, brown gold sand, black-brown jade, white sand jade, gold sand, etc.), and the airflow pressure is It is controlled at 0.2 to 0.9 MPa, and the obtained roughness (Ra) is about 2 to 8 µm. After the sand blasting treatment, fine powder particles or the like remaining on the inner surface of the base member must be removed. There is no particular limitation on the removal method, and it can be removed with high pressure gas or washed with water, which is familiar to those skilled in the art, and therefore will not be described in detail. For example, the method of degreasing treatment may sequentially include alkali washing, acid washing, water washing and high temperature drying (eg, drying at 200 to 450 ° C. for 10 to 15 minutes).

According to the seventh embodiment of the present invention, preferably, in the procedure (2), the surface of the base member obtained in the procedure (1) is preheated to 80 to 150 ° C, preferably 100 to 120 ° C.

According to the seventh embodiment of the present invention, the present invention further includes a non-stick coating layer obtained by the method.

In the method of manufacturing the non-stick coating layer of the seventh embodiment of the present invention, plasma spray coating is performed using ceramic powder and fluororesin powder as raw materials to form a composite coating layer containing fluororesin material and ceramic particles simultaneously. have. By heat-treating the composite coating layer at a temperature of 0 to 50 ° C higher than the melting point of the fluororesin material, it is advantageous to melt the fluororesin material in the composite coating layer again to form a fluororesin material layer. In the process of melting the fluororesin, the ceramic particles can be relatively uniformly dispersed in the fluororesin material layer because no change occurs, thereby forming the non-stick coating layer of the present invention. The non-stick coating layer formed in this way has the following beneficial effects.

1) Since the coating layer is formed through a special method such as plasma spray coating, in the plasma spray coating process (that is, the process in which molten particles are accumulated), all particles are connected in a molten state, so the coating layer is dense (small porosity). And, the bond between the particles is very strong (high bonding strength), and the non-stick coating layer and the base member are mechanically bonded to a rough surface through high-speed melting particles, and have a much higher strength than the coating layer formed by air spraying and sintering.

2) In the formed non-stick coating layer, since the ceramic particles are relatively uniformly dispersed in the fluororesin particles, the hardness of the non-stick coating layer (mainly indicating the intrinsic properties of the ceramic material) is secured, and the surface of the non-stick coating layer is It improves the hydrophobic non-stick property (the surface has a large wetting angle, mainly representing the intrinsic properties of fluororesin materials), further improves the scratch resistance and corrosion resistance of the non-stick coating layer, and further improves the service life of the non-stick coating layer. It is advantageous to extend.

3) Among the formed non-stick coating layer, since the ceramic particles are relatively uniformly dispersed in the fluororesin particles, the formed non-stick coating layer has a uniform and stable structure from the inside to the outside, and the inner layer even if the surface is partially worn during use. The structure and the outer layer structure are consistent, so it is still possible to maintain the performance of the non-stick coating layer such as hardness, hydrophobic non-stick property, bonding strength, scratch resistance, corrosion resistance, etc. Further, it is advantageous for extending the service life of the coating layer.

The present invention provides a cooking apparatus including the cookware of the present invention. Preferably, the cooking device is a wok, frying pan, air fryer, fryer, bread maker, electric rice cooker, electric pressure cooker or soymilk maker.

Hereinafter, the present invention will be described in detail through production examples and examples. In the following manufacturing examples and examples, unless otherwise specified, each material used is commercially available, and each method used is a conventional method in the art.

The particle size (D50) of the PFA powder particles is measured using a laser particle size analyzer (purchased from Xiamen Kerwang Electronics Co., Ltd., model name: KW510).

The particle shape analyzer (purchased from Zhuhai OMEC Instruments Co., Ltd., model name: PIP8.1) is used to measure the sphericity of PFA powder particles.

The flowability of the PFA powder particles is measured using a flow meter according to GB1482-84.

The purity of the PFA powder particles is measured using an automatic polarimeter (purchased from Atago China (model name: AP ~ 300)).

The melting point of the PFA powder particles is measured using a micro spot meter (purchased by Jinan Hanon Instruments Co., Ltd., model name: MP ~ 300).

The surface roughness (Ra) of PFA powder particles is measured using a surface roughness meter (purchased from Beijing Time High Technology Co., Ltd., model name: TIME3201).

)에서 구매. 모델명: XHSCAZ~2)를 사용하여 원시 접촉각과 마찰후 접촉각을 측정하며, 측정범위는 0~180°이다.Contact angle measuring instrument (Shenzhen Xinxing Trade Co., Ltd.

). Model name: XHSCAZ ~ 2) is used to measure the original contact angle and the contact angle after friction, and the measurement range is 0 to 180 °.

Hereinafter, examples of each embodiment are tested using the following test method.

1. Surface hardness of coating layer:

Vickers hardness of each coating layer is measured using a Vickers hardness tester (available from Shanghai Changfang Optical instrument Co., Ltd., model name: HX ~ 1000) according to GB / T 9790-1988.

2. Cohesion of coating layer:

The bonding strength of the coating layer is measured according to G9 8642-88.

3. Porosity of coating layer:

The porosity of the coating layer is measured in accordance with the People's Republic of China machinery standard JB / T7509-94.

4. Spray efficiency of coating layer:

The spraying efficiency of the coating layer is calculated according to the equation: spraying efficiency = (weight of the workpiece after spraying-weight of the workpiece before spraying) / (powder input amount * deposition rate). Here, the deposition rate is fixed at 70%.

5. Scratch resistance of the coating layer:

Prepare a washing water with a concentration of 5% by weight with a detergent, 3M (7447C) polishing scrubber, weight load 2.5kgf, swing distance to the left and right once, replace the polishing scrubber every 250 times, and check whether the coating layer peels off after each scratch. Check or check the exposure of the base member (stop the test if more than 10 lines are exposed), and record the number of times the wear is withdrawn.

6. Acid resistance, alkali resistance, salt resistance:

Acid resistance: Pour 5% by weight of acetic acid solution to the maximum level of the inner wall of the inner pot, put the inner pot in the container, turn on the power, close the lid, heat continuously for 10 minutes (keep boiling), and boil it. Keep warm and soak for 24 hours at 100 ℃. After the test is over, wash the inner pot cleanly and visually check the change of the coating layer surface.

Alkali resistance: Pour 0.5% by weight of sodium hydroxide solution to the maximum level of the inner wall of the inner pot, put the inner pot in the container, turn on the power, close the lid and heat it for 10 minutes (keep boiling) to boil it, Keep warm and soak for 24 hours at 100 ℃. After the test is over, wash the inner pot cleanly and visually check the change of the coating layer surface.

Salt resistance: Pour 5% by weight of sodium chloride solution to the maximum level of the inner wall of the inner pot, put the inner pot into the container, turn on the power and close the lid for 8 hours continuously (replenish water once every 2 hours to test the liquid level) To maintain the position at the start of the heating), and keeping it warm for 80 hours at 80 ° C for 1 cycle, and after the test is completed for each cycle, the state of the surface of the coating layer is visually checked, and bubbles, protrusions, etc. on the coating layer Record the number of cycles during which defects occur.

7. Wear resistance and wettability:

The friction damage test is conducted according to GB / T 1768 ~ 79 (89). Before and after the friction damage test, the contact angle (raw contact angle and post-friction contact angle) and weight are measured, and the weight loss ratio is calculated by the equation. Here, the weight loss ratio = (weight before friction-weight after friction) / weight before friction.

Here, in each embodiment, as a result of testing for abrasion resistance and wettability, the non-stick coating layer of the present invention still has excellent wettability inside even after the surface is damaged, and wettability continues to be in a good condition as long as the base member is not exposed. The retention was shown. As a result of the friction damage test on the three samples of the PTFE non-stick coating layer, the ceramic non-stick coating layer and the non-stick coating layer of the present invention, the non-stick coating layer of the present invention is only partially peeled off in the friction damage process and affects the use performance However, the PTFE non-stick coating layer and the ceramic non-stick coating layer were found to have a large difference due to the peeling of the sheet-like layer.

Hereinafter, a first embodiment of the present invention will be described through examples.

In the examples below, the raw materials used are as follows.

Usually PFA powder was purchased from Daikin Fluoro Coatings (shanghai) Co.Ltd., The particle size (D50) is 15μm, 95% of the powder has a spherical ratio of 18%, fluidity of 78s / 50g, purity of 94%, melting point of 345 ℃, the surface roughness (Ra) is 0.6㎛.

Polyvinyl alcohol was purchased from Shanghai Fusichun Chemical Technology Co., Ltd. (上海 富 思春 化工 科技 有限公司), model name is PVA1788.

Polyvinyl chloride was purchased from Shanghai Jining Shiye Co., Ltd. (上海 紀 寧 實業 有限公司), and the model name is K55-59.

Polyacrylic ester was purchased from Changzhou Chunjiang Chemistry Co., Ltd. (長 江春江 化學 有限公司), model name SL325.

)에서 구매하였고, 입도(D50)는 25μm, 95%의 분말의 구형율이 95%, 유동성은 12s/50g이다.Aluminum oxide is Beijing Sunyao Technology Development Co., Ltd. (

), The particle size (D50) is 25μm, 95% of the powder has a sphericity of 95%, and fluidity is 12s / 50g.

Titanium oxide was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size (D50) is 22 μm, 95% of the powder has a sphericity of 92%, and fluidity is 18s / 50g.

Preparation Example 1

(1) Usually, a paste was prepared by mixing 47.6 kg of PFA powder, 0.4 kg of polyvinyl alcohol, 2 kg of glycerin, and 50 kg of water.

(2) The paste was air-flow-sprayed and dried to obtain a modified PFA powder (S1). Here, the conditions of the airflow spraying treatment were a spray pressure of 0.4 MPa, a flow rate of the spray airflow of 2 m ³ / h, an inlet temperature of 320 ° C, and an air outlet temperature of 100 ° C. Thus, a modified PFA powder (S1) was obtained.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 52 μm, the spherical modulus of the 96% powder was 95%, the fluidity was 15 s / 50 g, the purity was 99.9%, the melting point was 410 ° C., and the surface roughness (Ra) was 0.2 μm. to be. See FIG. 1 for the microscopic form of the modified PFA powder.

Preparation Example 2

(1) Usually, a paste was prepared by mixing 54.8 kg of PFA powder, 0.2 kg of polyvinyl chloride, 3 kg of paraffin, and 42 kg of water.

(2) The paste was air-flow sprayed and dried to obtain a modified PFA powder (S2). Here, the conditions of the airflow spray treatment were a spray pressure of 0.3 MPa, a flow rate of the spray airflow of 1 m ³ / h, an inlet temperature of 300 ° C., and an air outlet temperature of 60 ° C. Thus, a modified PFA powder (S2) was obtained.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 46 μm, the spherical ratio of the powder of 95% was 93%, the fluidity was 13 s / 50 g, the purity was 99.5%, the melting point was 405 ° C, and the surface roughness (Ra) was 0.15 μm. to be.

Preparation Example 3

(1) Usually, paste was prepared by mixing 38.5 kg of PFA powder, 0.5 kg of polyacrylic ester, 1 kg of graphite, and 60 kg of water.

(2) The paste was air-flow sprayed and dried to obtain a modified PFA powder (S3). Here, the conditions of the airflow spray treatment were a spray pressure of 0.5 MPa, a flow rate of the spray air stream of ³ m ³ / h, an inlet temperature of 350 ° C, and an air outlet temperature of 140 ° C. Thus, a modified PFA powder (S3) was obtained.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 59 μm, the spherical modulus of the 95% powder was 98%, the fluidity was 18 s / 50 g, the purity was 99.9%, the melting point was 418 ° C, and the surface roughness (Ra) was 0.28 μm. to be.

Preparation Example 4

(1) Usually, a paste was prepared by mixing 32.2 kg of PFA powder, 1 kg of polyvinyl alcohol, 1.8 kg of glycerin and 65 kg of water.

(2) The paste was subjected to airflow spray treatment and drying treatment to obtain a modified PFA powder (S4). Here, the conditions of the airflow spray treatment were a spray pressure of 0.58 MPa, a flow rate of the spray airflow of 3.9 m ³ / h, an inlet temperature of 210 ° C., and an air outlet temperature of 52 ° C. Thus, a modified PFA powder (S4) was obtained.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 42 μm, 90% of the powder was 75%, the fluidity was 12 s / 50 g, the purity was 96%, the melting point was 352 ° C., and the surface roughness (Ra) was 0.12 μm. to be.

Preparation Example 5

(1) Usually, paste was prepared by mixing 58 kg of PFA powder, 1.8 kg of polyvinyl alcohol, 0.6 kg of glycerin and 39.6 kg of water.

(2) The paste was air-flow sprayed and dried to obtain a modified PFA powder (S5). Here, the conditions of the airflow spray treatment were a spray pressure of 0.32 MPa, a flow rate of the spray air stream of 3.2 m ³ / h, an inlet temperature of 390 ° C, and an air outlet temperature of 195 ° C. Thus, a modified PFA powder (S5) was obtained.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 98 μm, the sphericity of the 88% powder was 90%, the fluidity was 24 s / 50 g, the purity was 99.7%, the melting point was 415 ° C., and the surface roughness (Ra) was 0.42 μm. to be.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member of the aluminum pot is pretreated. Here, the pretreatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) 60 to 80 mesh brown gold sand After using a sandblasting treatment on the inner surface of the base member of the aluminum pot at a spray airflow pressure of 0.6 MPa, the surface roughness (Ra) was 3 µm, and then the powder particles remaining on the inner surface of the base member of the pot with air flow. And cleanly blown, e) alkali-washed at 80 ° C for 1 minute with 40% by weight NaOH solution, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) 160 kg of aluminum oxide powder, 40 kg of titanium oxide powder and 50 kg of modified PFA powder (S1) were mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture. Plasma spray coating is applied to the powder mixture to form a non-stick coating layer (Q1) on the surface of the base member. Here, the conditions of the plasma spray coating treatment are 40kW spray power, 80mm spray distance, 80 ° ± 1 ° spray angle, 6g / min powder input, 330 ° C PFA spray temperature, spray temperature of aluminum oxide and titanium oxide. Is 3000 ℃, spray voltage is 60V, spray current is 625A, spray thickness is 180μm, main gas is hydrogen gas, auxiliary gas is argon gas, flow rate of hydrogen gas is 4L / min, flow rate of argon gas is 30L / min to be.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member of the stainless steel pot is pretreated. Here, the pretreatment method is a) removing oil at 55 ° C for 8 minutes, b) washing with deionized water, c) drying at 100 ° C for 5 minutes, and d) 60-80 mesh brown gold sand. The powder particles remaining on the inner surface of the base member of the cooker with air flow after making the surface roughness (Ra) 3 μm by sandblasting the inner surface of the base member of the stainless steel pot at a spray air pressure of 0.8 MPa. And cleanly blown, e) alkali-washed at 80 ° C for 1 minute with 40% by weight NaOH solution, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then cooled to 375 ° C. And drying for 11 minutes.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) 125 kg of aluminum oxide powder, 25 kg of titanium oxide powder and 50 kg of modified PFA powder (S2) were mixed and dried at 100 ° C. for 1.5 hours to obtain a powder mixture. Plasma spray coating is applied to the powder mixture to form a non-stick coating layer (Q2) on the surface of the base member. Here, the conditions of the plasma spray coating treatment is a spray power of 35kW, a spray distance of 75mm, a spray angle of 76 ° ± 1 °, a powder input of 7g / min, a PFA spray temperature of 315 ° C, and a spray temperature of aluminum oxide and titanium oxide. A is 2900 ℃, spray voltage is 55V, spray current is 630A, spray thickness is 150μm, main gas is hydrogen gas, auxiliary gas is argon gas, flow rate of hydrogen gas is 3L / min, flow rate of argon gas is 28L / min .

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member of the stainless steel pot is pretreated. Here, the pretreatment method is a) removing oil at 55 ° C for 8 minutes, b) washing with deionized water, c) drying at 100 ° C for 5 minutes, and d) 60-80 mesh brown gold sand. The powder particles remaining on the inner surface of the base member of the cooker with air flow after the surface roughness (Ra) was 4 µm by sandblasting the inner surface of the base member of the stainless steel pot at a spray air pressure of 0.8 MPa. And cleanly blown, e) alkali-washed at 80 ° C for 1 minute with 40% by weight NaOH solution, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then 450 ° C And drying for 10 minutes.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) 192 kg of aluminum oxide powder, 58 kg of titanium oxide powder and 50 kg of modified PFA powder (S3) were mixed and dried at 100 ° C. for 1.5 hours to obtain a powder mixture. Plasma thermal spray coating is applied to the powder mixture to form a non-stick coating layer (Q3) on the surface of the base member. Here, the conditions of the plasma spray coating treatment are 45kW spray power, 85mm spray distance, 84 ° ± 1 ° spray angle, 5g / min powder input, 335 ° C PFA spray temperature, spray temperature of aluminum oxide and titanium oxide. A is 3100 ℃, spray voltage is 65V, spray current is 620A, spray thickness is 250μm, main gas is hydrogen gas, auxiliary gas is argon gas, flow rate of hydrogen gas is 5L / min, flow rate of argon gas is 32L / min .

Example 4

According to the method of Example 1, the difference is that the modified PFA powder (S1) used in the plasma spray coating treatment is replaced with the modified PFA powder (S4).

Example 5

According to the method of Example 1, the difference is that the modified PFA powder (S1) used in the plasma spray coating treatment is replaced with the modified PFA powder (S5).

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the powder mixture uses a mixture of 80 kg of aluminum oxide powder, 20 kg of titanium oxide powder and 50 kg of modified PFA powder (S1).

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the powder mixture uses a mixture of 240 kg of aluminum oxide powder, 60 kg of titanium oxide powder and 50 kg of modified PFA powder (S1).

Example 8

According to the method of Example 1, the difference is that in the procedure (3), the powder mixture uses a mixture of 200 kg of aluminum oxide powder and 50 kg of modified PFA powder (S1).

Example 9

According to the method of Example 1, the difference is that in the procedure (3), the powder mixture uses a mixture of 200 kg of titanium oxide powder and 50 kg of modified PFA powder (S1).

Example 10

According to the method of Example 1, the difference is that in the procedure (3), the conditions of the plasma spray coating treatment are 25kW of spray power, 60mm of spray distance, 71 ° ± 1 ° of spray angle, and 3.5g / min of powder input , PFA spray temperature is 300 ℃, aluminum oxide and titanium oxide spray temperature is 2800 ℃, spray voltage is 50V, spray current is 600A, spray thickness is 100μm, main gas is hydrogen gas, auxiliary gas is argon gas, hydrogen gas The flow rate is 2 L / min, and the flow rate of argon gas is 25 L / min.

Comparative Example 1

According to the method of Example 1, the difference is that the PFA powder used is usually a PFA powder, and usually the PFA powder cannot block the sprayer during the plasma spray coating process, so that the powder cannot be introduced and thus cannot form a coating layer.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer of the procedure (3) to the procedure (4) is a PFA non-stick coating layer ( D1). Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow rate pressure is 0.45 MPa, the spray pressure is 0.4 MPa, and the spray coating layer thickness is 40 μm, spraying After it is finished, it is dried in an infrared furnace, dried for 10 minutes at a low temperature section of 120 ℃, and insulated for 20 minutes at a high temperature section of 400 ℃.

Comparative Example 3

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. The specific procedure

(1) Pre-treatment with respect to the base member of the aluminum pot according to the procedure (1) of Example 1,

(2) Preheat the surface of the base member obtained in the procedure (1) to 85 ° C,

(3) Base oil spray: the spray pressure is 0.3MPa, the spray angle is 70 °, the spray distance is 30cm, the film layer thickness is 25μm, the drying temperature is 130 ℃, and it is kept warm for 12 minutes,

(4) Surface oil spraying: spray pressure is 0.4MPa, spray angle is 70 °, spray distance is 35cm, film layer thickness is 30μm, dry solidification temperature is 420 ℃, and it is kept warm for 15 minutes.

Includes.

Comparative Example 4

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica and aluminum oxide. The specific procedure

(1) Pre-treatment with respect to the base member of the aluminum pot according to the procedure (1) of Example 1,

(2) Preheat the surface of the base member obtained in the procedure (1) to 60 ° C,

(3) Spraying base oil: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes,

(4) Surface oil spraying: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70˚, the film layer thickness is 10㎛, and after completion of spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Includes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

[Table 1]

Note:-indicates that it cannot be measured. Same as below.

[Table 2]

[Table 3]

Looking at the results of Tables 1 to 3, in the method of manufacturing the non-stick coating layer using the plasma spray coating technology of the present invention, a layer of non-stick coating on the surface of the base member using a mixture of specified modified PFA powder and ceramic powder It can be seen that the non-stick coating layer having excellent performance can be obtained by spraying, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when comparing Example 1 with the results of Examples 4 and 5, the particle size (D50) of the modified PFA powder is 45 to 60 μm, the spherical ratio of the powder of 80% or more is 90 to 99%, and the fluidity is 10 to 20 s / In the case of 50 g, it can be seen that the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability and service life of the non-stick coating layer can be further improved.

Here, when Example 1 is compared with Example 10, the specified plasma spray coating treatment conditions (spray power is 35 to 45 kW, spray distance is 75 to 85 mm, spray angle is 75 to 85 °, powder input is 5 to 7 g / min, PFA spray temperature is 315 ~ 335 ℃, aluminum oxide and titanium oxide spray temperature is 2900 ~ 3100 ℃, spray voltage is 55 ~ 65V, spray current is 620 ~ 630A, spray thickness is 150 ~ 300μm, main gas is hydrogen Gas and auxiliary gas are argon gas, the flow rate of hydrogen gas is 3 ~ 5L / min, and the flow rate of argon gas is 28 ~ 32L / min), the surface hardness of the non-stick coating layer, bonding strength, scratch resistance, corrosion resistance, wettability and service life It can be seen that can be further improved.

Hereinafter, a second embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

Aluminum oxide was purchased from Beijing Sunyao Technology Development Co., Ltd., particle size (D50) is 25 μm, and fluidity is 12 s / 50 g.

Titanium oxide was purchased from Beijing Sunyao Technology Development Co., Ltd., with a particle size (D50) of 22 μm and fluidity of 18 s / 50 g.

Usually PFA powder was purchased from Daikin Fluoro Coatings (shanghai) Co.Ltd., The particle size (D50) is 15μm, 95% of the powder has a sphericity of 18%, fluidity of 78s / 50g, purity of 94%, melting point of 345 ℃, the surface roughness (Ra) is 0.6㎛.

The method for preparing the modified PFA powder (A1) includes the following procedures.

(1) A paste is prepared by mixing 0.4 kg of PFA powder, 0.4 kg of polyvinyl alcohol (purchased from Shanghai Fusichun Chemical Technology Co., Ltd., model name PVA1788), 2 kg of glycerin and 50 kg of water.

(2) The paste is subjected to airflow spray treatment and drying treatment to obtain a modified PFA powder (A1). Here, the conditions of the airflow spray drying treatment are: the spray pressure is 0.4 MPa, the flow rate of the spray airflow is 2 m ³ / h, the inlet temperature is 320 ° C, and the air outlet temperature is 100 ° C.

As a result of the measurement, the particle size (D50) of the modified PFA powder (A1) was 52 μm, the fluidity was 15 s / 50 g, the purity was 99.9%, the melting point was 410 ° C., and the surface roughness (Ra) was 0.2 μm.

The method for preparing the modified PFA powder (A2) includes the following procedures.

(1) Usually 54.8 kg of PFA powder, polyvinyl chloride (purchased from Shanghai Jining Shiye Co., Ltd., model name K55 ~ 59) 0.2 kg, 3 kg of paraffin and 42 kg of water are prepared to prepare a paste.

(2) The paste is air-flow-sprayed and dried to obtain a modified PFA powder (A2). Here, the conditions of the air flow spray drying treatment are the spray pressure is 0.3 MPa, the flow rate of the spray air flow is 1 m ³ / h, the inlet temperature is 300 ° C., and the air outlet temperature is 60 ° C.

As a result of the measurement, the particle size (D50) of the modified PFA powder was 46 μm, the fluidity was 13 s / 50 g, the purity was 99.5%, the melting point was 405 ° C., and the surface roughness (Ra) was 0.15 μm.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 Sandblasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa to make the surface roughness (Ra) 3 μm, then blow off the powder particles remaining on the inner surface of the base member of the pot with airflow. , e) Alkali wash at 80 ° C for 1 minute with 40% by weight NaOH solution, f) neutralization for 3 minutes with 20% by weight nitric acid solution, g) wash with deionized water, and then at 300 ° C for 12 minutes Drying.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder and modified PFA powder (A1) as raw materials. Here, the conditions of the plasma spray coating treatment are 40kW spray power, 625A spray current, 45L / min flow rate of argon gas in the working gas, and 4L / min flow rate of hydrogen gas, and the spray distance between the plasma sprayer and the base member is 80mm, the spray angle is 80 ° ± 1 °, the sprayer moving speed is 80mm / s, and among the flame stems formed in the plasma sprayer, aluminum oxide powder is added at a distance D1 (1/4 of the flame stem length) The input amount is 4.2 g / min, and the modified PFA powder (A1) is placed at a distance D2 (half the length of the flame stem) from the outlet of the atomizer, and the input amount is 2.8 g / min. Thus, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S1.

As a result of observing the cross-section and the longitudinal cross-section of the manufactured non-stick coating layer (S1) at different magnifications with an electron microscope, the non-stick coating layer is formed by aggregating particulate materials, and each particulate material includes a core and a coating layer. The lateral diameter and thickness of the particulate material in the non-stick coating layer were measured through the method of measuring the area division (10 areas of each particle are counted and 5 areas are randomly selected). As a result of measurement and statistics, in the non-stick coating layer (S1), the lateral diameter of the particulate material is distributed within the range of 48 to 65 μm, the thickness is distributed within the range of 3.2 to 3.6 μm, and the thickness of one side of the fluororesin material coating layer is It was distributed within the range of 0.5 to 0.8 μm.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using titanium oxide powder and modified PFA powder (A2) as raw materials. Here, the conditions of the plasma spray coating treatment are the spray power of 35 kW, the spray current of 620 A, the flow rate of argon gas in the working gas is 40 L / min, the flow rate of hydrogen gas is 3 L / min, and the spray distance between the plasma sprayer and the base member is 85mm, the spray angle is 80 ° ± 1 °, the sprayer moving speed is 85mm / s, and among the flame stems formed in the plasma sprayer, titanium oxide powder is introduced at a distance D1 (1/3 of the flame stem length) from the sprayer outlet. The input amount is 5 g / min, and the modified PFA powder (A2) is placed at a distance D2 (2/3 of the flame stem length) from the outlet of the atomizer, and the input amount is 2.5 g / min. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S2.

As a result of measurement and statistics, in the non-stick coating layer (S2), the lateral diameter of the particulate material is distributed within the range of 40 to 62 μm, the thickness is distributed within the range of 3.4 to 4.0 μm, and the thickness of one side of the coating layer of the fluororesin material is It was distributed within the range of 0.3 to 0.5 μm.

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The method of Example 1 is pretreated with respect to the base member (thickness of 2.5 mm) of the aluminum pot.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder and modified PFA powder (A1) as raw materials. Here, the conditions of the plasma spray coating treatment are the spray power of 45 kW, the spray current of 630 A, the flow rate of argon gas in the working gas is 50 L / min, the flow rate of hydrogen gas is 5 L / min, and the spray distance between the plasma sprayer and the base member is 75mm, the spray angle is 80 ° ± 1 °, the spraying speed of the sprayer is 75mm / s, and among the flame stems formed in the plasma sprayer, aluminum oxide powder is added at a distance D1 (1/4 of the flame stem length). The input amount is 3.5 g / min, and the modified PFA powder (A1) is introduced at a distance D2 (1/2 of the flame stem length) from the outlet of the atomizer, and the input amount is 3.5 g / min. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S3.

As a result of measurement and statistics, in the non-stick coating layer (S3), the lateral diameter of the particulate matter is distributed within the range of 56 to 75 μm, the thickness is distributed within the range of 2.2 to 2.8 μm, and the thickness of one side of the fluororesin material coating layer is It was distributed within the range of 0.2 to 0.3 μm.

Example 4

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame among the flame stems formed in the plasma sprayer, It is to form a non-stick coating layer having a thickness of 200 µm by introducing modified PFA powder (A1) at a distance D2 (2/3 of the flame stem length) from the exit.

Example 5

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/3 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. It is to form a non-stick coating layer having a thickness of 200 µm by introducing modified PFA powder (A1) at a distance D2 (1/2 of the flame stem length) from the outlet.

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame among the flame stems formed in the plasma sprayer, A non-stick coating layer having a thickness of 200 µm was formed by introducing modified PFA powder (A1) at a distance D2 (5/6 of the flame stem length) from the outlet.

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 600 A, the flow rate of hydrogen gas in the working gas is 2 L / min, and the flow rate of argon gas is 35 L / As a condition of min, a non-stick coating layer having a thickness of 200 μm is formed.

Example 8

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of hydrogen gas in the working gas is 6 L / min, and the flow rate of argon gas is 55 L / As a condition of min, a non-stick coating layer having a thickness of 200 μm is formed.

Comparative Example 1

According to the method of Example 1, the difference is that in step (3), the modified PFA powder (A1) is not added and a non-stick coating layer having a thickness of 200 µm is formed.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer of the procedure (3) to the procedure (4) is a PFA non-stick coating layer ( D1). Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow rate pressure is 0.45 Mpa, the spray pressure is 0.4 Mpa, the spray coating layer thickness is 40 μm, and the spray After it is finished, it is dried in an infrared electric furnace, dried for 10 minutes in a low temperature section at 120 ° C, and insulated for 20 minutes in a high temperature section at 400 ° C.

Comparative Example 3

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: the spray pressure is 0.3 Mpa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4Mpa, spray angle is 70 °, spray distance is 35cm, film layer thickness is 30μm, dry solidification temperature is 420 ℃ and insulated for 15 minutes.

Comparative Example 4

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Spraying base oil: the spray pressure is 0.3 Mpa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3Mpa, the spray distance is 25cm, the spray angle is 70˚, the film layer thickness is 10μm, and after spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

[Table 4]

[Table 5]

[Table 6]

Looking at the results of Tables 4 to 6, during the method of manufacturing the non-stick coating layer using the plasma spray coating technique of the second embodiment of the present invention, a layer of paddy on the surface of the base member using a mixture of PFA powder and ceramic powder By spraying the stick coating layer, it is possible to obtain an excellent non-stick coating layer, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when Example 1 is compared with the results of Examples 4 to 6, the ceramic powder and the fluororesin powder have a specific interval (i.e., 1/6 ≤ D2 to D1 ≤ 1/2 of the flame stem length) , Preferably it is added within 1 / 4≤D2 ~ D1≤1 / 3 of the flame stem length of the flame stem length, so it can be seen that the surface hardness and wettability of the non-stick coating layer can be more comprehensively improved. .

Here, when Example 1 is compared with Examples 7 to 8, the specified plasma spray coating treatment conditions (that is, the spray power is 35 to 45 kW, the spray current is 620 to 630 A, and the flow rate of the main gas in the working gas is 40) It can be seen that the flow rate of the auxiliary gas is ~ 50 L / min, and the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability and service life of the non-stick coating layer can be further improved at 3 to 5 L / min).

Hereinafter, a third embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

Aluminum oxide powder (A1) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 38 ~ 46㎛, and the fluidity is 21s / 50g.

Aluminum oxide powder (A2) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 52 ~ 62㎛, and the fluidity is 23s / 50g.

Titanium oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 42 ~ 54㎛, and the fluidity is 25s / 50g.

Usually, PFA powder, modified PFA powder (A1) and modified PFA powder (A2) were used as those used in the second embodiment.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, B) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using 60 to 80 mesh brown gold wire, 0.6 After sand blasting the inner surface of the base member of the aluminum pot at a spray air pressure of Mpa to make the surface roughness (Ra) 3 μm, the powder particles remaining on the inner surface of the base member of the pot with air flow (air) Blown clean, e) 40% by weight of NaOH solution, alkali washed at 80 ° C for 1 minute, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then at 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder (A1) and modified PFA powder (A1) as raw materials. Here, the conditions of the plasma spray coating treatment are the spray power of 45kW, the spray current of 580A, the flow rate of hydrogen gas in the working gas is 4L / min, the flow rate of argon gas is 45L / min, and the spray distance between the plasma sprayer and the base member is 100mm, spray angle is 80 ° ± 1 °, sprayer moving speed is 80mm / s, and aluminum oxide powder (A1) is located at a distance D1 (1/4 of the length of the flame stem) from the outlet of the spray stem formed in the plasma sprayer. The input amount is 4.2 g / min, and the modified PFA powder (A1) is placed at a distance D2 (1/2 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 2.8 g / min. Thus, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S1.

As a result of observing the cross-section and the longitudinal cross-section of the prepared non-stick coating layer (S1) at different magnifications, the non-stick coating layer is formed by accumulating particulate materials, and each particulate material includes a core and a coating layer. The lateral diameter and thickness of the particulate material in the non-stick coating layer were measured through the method of measuring the area division (10 areas of each particle are counted and 5 areas are randomly selected). As a result of measurement and statistics, in the non-stick coating layer (S1), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 98 to 142 μm, and the thickness (D) is within the range of 3.2 to 3.8 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.48 ~ 0.52μm.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using titanium oxide powder and modified PFA powder (A2) as raw materials. Here, the conditions of the plasma spray coating treatment are the spray power of 40kW, the spray current of 560A, the flow rate of hydrogen gas in the working gas is 3L / min, the flow rate of argon gas is 40L / min, and the spray distance between the plasma sprayer and the base member is 110mm, the spray angle is 80 ° ± 1 °, the sprayer moving speed is 85mm / s, and among the flame stems formed in the plasma sprayer, titanium oxide powder is introduced at a distance D1 (1/3 of the flame stem length) from the sprayer outlet. The input amount is 5 g / min, and the modified PFA powder (A2) is introduced at a distance D2 (2/3 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 2.5 g / min. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S2.

As a result of measurement and statistics, in the non-stick coating layer (S2), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 100 to 154 μm, and the thickness (D) is within the range of 4.5 to 4.8 μm. Distributed, 1 / 4R ² D is distributed in the range of 1.2Х10 ⁴ ~ 2.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer was distributed in the range of 0.45 ~ 0.52μm.

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder (A1) and modified PFA powder (A2) as raw materials. Here, the conditions of the plasma spray coating treatment are 50kW of spray power, 600A of spray current, 5L / min of the flow rate of hydrogen gas in the working gas, and 50L / min of the flow rate of argon gas, and the spray distance between the plasma sprayer and the base member is 90mm, the spray angle is 80 ° ± 1 °, the spray speed of the sprayer is 75mm / s, and the distance between the outlet of the sprayer and the distance D1 (1/4 of the length of the flame stem) formed from the plasma sprayer is aluminum oxide powder (A1). The input amount is 3.5 g / min, and the modified PFA powder (A2) is placed at a distance D2 (1/2 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 3.5 g / min. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S3.

As a result of measurement and statistics, in the non-stick coating layer (S3), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 134 to 162 μm, and the thickness (D) is within the range of 2.0 to 2.5 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.45 ~ 0.48μm.

Example 4

According to the method of Example 1, the difference is that in procedure (3), an aluminum oxide (A1) is replaced with the same amount of aluminum oxide powder (A2) to form a non-stick coating layer having a thickness of 200 µm, denoted S4 do.

As a result of measurement and statistics, in the non-stick coating layer (S4), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 130 to 185 μm, and the thickness is distributed within the range of 4.6 to 5.2 μm, 1 / 4R ² D was distributed in the range of 2.3Х10 ⁴ to 3.9Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer was distributed in the range of 0.54 to 0.58μm.

Example 5

According to the method of Example 1, the difference is that in the procedure (3), aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame stem of the flame stem formed in the plasma sprayer. A modified non-stick coating layer having a thickness of 200 µm is formed by inserting modified PFA powder (A1) at a distance D2 (2/3 of the length of the flame stem) from the outlet, and is designated S5.

As a result of measurement and statistics, in the non-stick coating layer (S5), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 98 to 142 μm, and the thickness (D) is within the range of 3.2 to 3.8 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.42 ~ 0.48μm.

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/3 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. A modified non-stick coating layer having a thickness of 200 µm is formed by inserting modified PFA powder (A1) at a distance D2 (1/2 of the length of the flame stem) from the outlet, and designated S6.

As a result of measurement and statistics, in the non-stick coating layer (S6), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 108 to 150 μm, and the thickness (D) is within the range of 2.8 to 3.2 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.42 ~ 0.46μm.

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame among the flame stems formed in the plasma sprayer, A modified non-stick coating layer having a thickness of 200 µm is formed by inserting modified PFA powder (A1) at a distance D2 (5/6 of the flame stem length) from the exit, and designated S7.

As a result of measurement and statistics, in the non-stick coating layer (S7), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 98 to 142 μm, and the thickness (D) is within the range of 3.2 to 3.8 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , the thickness of one side of the fluororesin material coating layer was distributed in the range of 0.38 ~ 0.42μm.

Example 8

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 500 A, the flow rate of hydrogen gas in the working gas is 2 L / min, and the flow rate of argon gas is 35 L / min. , The spray distance is 80 mm, forming a non-stick coating layer having a thickness of 200 µm, and is designated as S8.

As a result of measurement and statistics, in the non-stick coating layer (S8), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 81 to 115 μm, and the thickness (D) is within the range of 5.0 to 5.6 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.48 ~ 0.52μm.

Example 9

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of hydrogen gas in the working gas is 6 L / min, and the flow rate of argon gas is 55 L / min. , Spraying distance is 80mm to form a non-stick coating layer having a thickness of 200㎛, it is referred to as S9.

As a result of measurement and statistics, in the non-stick coating layer (S9), the lateral diameter (R) of the core (ceramic particles) of the particulate material is distributed within the range of 126 to 166 μm, and the thickness (D) is within the range of 1.6 to 2.0 μm. Distribution, 1 / 4R ² D is distributed in the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , and the thickness of one side of the fluororesin material coating layer is distributed in the range of 0.35 ~ 0.4μm.

Comparative Example 1

According to the method of Example 1, the difference is that in step (3), the modified PFA powder (A1) is not added and a non-stick coating layer having a thickness of 200 µm is formed.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer of the procedures (3) to (4) is usually performed by electrostatic spraying using PFA powder (ACX-33 powder of Daikin PFA). It is to form a PFA non-stick coating layer (D1) on the surface of the base member. Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow pressure is 0.45 MPa, the spray pressure is 0.4 MPa, and the spray coating layer thickness is 40 μm, spraying After the drying is done in an infrared electric furnace, and dried for 10 minutes at a low temperature section of 120 ℃, and insulated for 20 minutes at a high temperature section of 400 ℃.

Comparative Example 3

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: The spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4 MPa, spray angle is 70 °, spray distance is 35 cm, film layer thickness is 30 μm, dry solidification temperature is 420 ° C. and insulated for 15 minutes.

Comparative Example 4

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Base oil spray: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70˚, the film layer thickness is 10μm, and after spraying is completed, sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

[Table 7]

[Table 8]

[Table 9]

Looking at the results of Tables 7 to 9, in the method of manufacturing the non-stick coating layer using the plasma spray coating technology of the present invention, by spraying a layer of non-stick coating on the surface of the base member using a mixture of PFA powder and ceramic powder , It can be seen that a non-stick coating layer having excellent performance can be obtained, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when comparing Example 1 with the results of Examples 4 to 6, the ceramic powder and the fluororesin powder have a specific interval (i.e., 1 / 6≤D2 to D1≤ 1/2 of the flame stem length) , Preferably it is added within 1 / 4≤D2 ~ D1≤1 / 3 of the flame stem length of the flame stem length, so it can be seen that the surface hardness and wettability of the non-stick coating layer can be more comprehensively improved. .

Here, when Example 1 is compared with Examples 7 to 8, the specified plasma spray coating treatment conditions (that is, the spray power is 30-50 kW, the spray current is 560-600 A, and the flow rate of the main gas in the working gas is 40 ~ 50L / min, the flow rate of auxiliary gas is 3 ~ 5L / min, and the spray distance is 90 ~ 110mm), it is possible to further improve the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability and service life of the non-stick coating layer. You can see that there is.

Hereinafter, a fourth embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

Aluminum oxide powder (A1) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 38 ~ 46㎛, and the fluidity is 21s / 50g.

Aluminum oxide powder (A2) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 52 ~ 62㎛, and the fluidity is 23s / 50g.

Titanium oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 42 ~ 54㎛, and the fluidity is 25s / 50g.

Usually, PFA powder, modified PFA powder (A1) and modified PFA powder (A2) were used as those used in the second embodiment.

The manufacturing method of the coated composite powder (A1) includes the following procedures. (1) Aluminum oxide powder (A1) 28.6 kg, titanium oxide powder 9.6 kg, ordinary PFA powder 9.2 kg, polyvinyl alcohol (purchased from Shanghai Fusichun Chemical Technology Co., Ltd., model name PVA1788) 0.6 kg, glycerin 2 kg And 50 kg of water to prepare a paste. (2) The paste is air-flow sprayed and dried to obtain a coated composite powder (A1). Here, the conditions of the airflow spraying treatment are: the spray pressure is 0.4 MPa, the flow rate of the spray airflow is 2 m ³ / h, the inlet temperature is 380 ° C, and the air outlet temperature is 100 ° C. As a result of the measurement, the particle size of the coated composite powder (A1) was distributed at 39 to 48 µm, and the fluidity was 20 s / 50 g.

The manufacturing method of the coated composite powder (A2) includes the following procedures. (1) Aluminum oxide powder (A1) 59.6kg, ordinary PFA powder 5.8kg, polyvinyl chloride (purchased from Shanghai Jining Shiye Co., Ltd., model name K55-59) 0.6kg, paraffin 3kg and water 42kg mixed To prepare a paste. (2) The paste is air-flow-sprayed and dried to obtain a modified PFA powder (A2). Here, the conditions of the air flow spray drying treatment are the spray pressure of 0.3 MPa, the flow rate of the spray air flow is 1 m ³ / h, the inlet temperature is 350 ° C., and the air outlet temperature is 60 ° C. As a result of the measurement, the particle size of the coated composite powder (A2) was distributed at 42 to 56 µm, and the fluidity was 26 s / 50 g.

The manufacturing method of the coated composite powder (A3) includes the following procedures. (1) Aluminum oxide powder (A2) 43.3 kg, ordinary PFA powder 8.4 kg, polyvinyl chloride (purchased from Shanghai Jining Shiye Co., Ltd., model name K55-59) 0.3 kg, paraffin 2 kg and water 2.5 kg Mix to prepare a paste. (2) The paste is air-flow sprayed and dried. Here, the conditions of the airflow spray drying treatment are: a spray pressure of 0.5 MPa, a flow rate of the spray airflow of 2 m ³ / h, an inlet temperature of 400 ° C., and an air outlet temperature of 120 ° C. to obtain a coated composite powder (A3). As a result of the measurement, the particle size of the coated composite powder (A3) was distributed at 42 to 63 µm, and the fluidity was 24 s / 50 g.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 Sandblasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa to make the surface roughness (Ra) 3 μm, then blow off the powder particles remaining on the inner surface of the base member of the pot with airflow. Sending, e) alkali-washing at 80 ° C for 1 minute with 40% by weight NaOH solution, f) neutralization for 3 minutes with 20% by weight nitric acid solution, g) washing with deionized water, and then 12 minutes at 300 ° C During drying.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) 160 kg of aluminum oxide powder (A1), 40 kg of titanium oxide powder, 150 kg of coated composite powder (A1) and 50 kg of modified PFA powder (A1) were mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the conditions of the plasma spray coating treatment are spray power of 45 kW, spray current of 580 A, flow rate of argon gas in the working gas is 45 L / min, flow rate of hydrogen gas is 4 L / min, and the input amount of the powder mixture is 6 g / min. , The spray distance between the plasma sprayer and the base member is 100 mm, the spray angle is 80 ° ± 1 °, and the sprayer moving speed is 80 mm / s. Thus, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S1.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) With reference to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) 125 kg of aluminum oxide powder (A1), 25 kg of titanium oxide powder, 125 kg of coated composite powder (A1) and 50 kg of modified PFA powder (A2) were mixed and dried at 110 ° C. for 1.5 hours to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the plasma spray coating process includes the following conditions. The spraying power of the plasma sprayer is 40 kW, the spraying current is 560 A, the flow rate of argon gas in the working gas is 40 L / min, the flow rate of hydrogen gas is 3 L / min, and the input amount of the powder mixture is 7 g / min. The spray distance between the plasma sprayer and the base member was 110 mm, the spray angle was 80 ° ± 1 °, and the sprayer moving speed was 85 mm / s. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S2.

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) With reference to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) 192 kg of aluminum oxide powder (A1), 58 kg of titanium oxide powder, 200 kg of coated composite powder (A1) and 50 kg of modified PFA powder (A1) were mixed and dried at 100 ° C. for 1.5 hours to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the spray power of the plasma atomizer is 45 kW, the spray current is 600 A, the flow rate of argon gas in the working gas is 50 L / min, the flow rate of hydrogen gas is 5 L / min, and the input amount of the powder mixture is 5 g / min. The spray distance between the plasma sprayer and the base member is 90 mm, the spray angle is 80 ° ± 1 °, and the spray speed of the sprayer is 75 mm / s. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S3.

Example 4

According to the method of Example 1, the difference is that in procedure (3), 200 kg of aluminum oxide powder (A1), 150 kg of coated composite powder (A2) and 50 kg of denatured PFA powder (A1) are mixed and for 1 hour at 110 ° C. Drying to obtain a powder mixture to form a non-stick coating layer, designated as S4.

Example 5

According to the method of Example 4, the difference is that in the procedure (3), the aluminum oxide powder (A1) is replaced with the same amount of aluminum oxide powder (A2), and the coating is made with the same amount of coated composite powder (A3). The non-stick coating layer is formed by replacing the composite powder (A1), and is designated as S5.

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 500 A, the flow rate of hydrogen gas in the working gas is 2 L / min, and the flow rate of argon gas is 35 L / min. , Spraying distance is 80mm to form a non-stick coating layer having a thickness of 200㎛, it is referred to as S6.

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of hydrogen gas in the working gas is 6 L / min, and the flow rate of argon gas is 55 L / min. And a non-stick coating layer having a thickness of 200 µm under a condition of 80 mm spraying, and designated as S7.

Comparative Example 1

According to the method of Example 1, the difference is that in the procedure (3), a non-stick coating layer having a thickness of 200 µm is formed without adding the coated composite powder (A1).

Comparative Example 2

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: The spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4 MPa, spray angle is 70 °, spray distance is 35 cm, film layer thickness is 30 μm, dry solidification temperature is 420 ° C. and insulated for 15 minutes.

Comparative Example 3

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Base oil spray: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70 °, the film layer thickness is 10μm, and after spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

Table 10

[Table 11]

Table 12

Looking at the results of Tables 10 to 12, in the method of manufacturing the non-stick coating layer using the plasma spray coating technology of the present invention, a layer of paddy on the surface of the base member using a mixture of PFA powder, ceramic powder and coated composite powder By spraying the stick coating layer, it is possible to obtain an excellent non-stick coating layer, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when comparing Example 1 with the results of Examples 4 and 5, the surface of the non-stick coating layer is obtained by using a mixture of aluminum oxide and titanium oxide (in particular, a mixture having a weight ratio of 1: (0.05 to 0.4)) as ceramic powder. It can be seen that it is advantageous to further improve the hardness.

Here, when Example 1 is compared with Examples 6 and 7, the specified plasma spray coating treatment conditions (that is, the spray power is 40-50 kW, the spray current is 560-600 A, and the flow rate of the main gas in the working gas is 40 It can be seen that at ~ 50 L / min, the flow rate of the auxiliary gas is 3 to 5 L / min), the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability, and service life of the non-stick coating layer can be further improved.

Hereinafter, a fifth embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

Aluminum oxide powder (A1) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 38 ~ 46㎛, and the fluidity is 21s / 50g.

Aluminum oxide powder (A2) was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 52 ~ 62㎛, and the fluidity is 23s / 50g.

Titanium oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size is distributed in 42 ~ 54㎛, and the fluidity is 25s / 50g.

Usually, PFA powder, modified PFA powder (A1) and modified PFA powder (A2) were used as those used in the second embodiment.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 After sand blasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa to make the surface roughness (Ra) 3 μm, the powder particles remaining on the inner surface of the base member of the pot with air flow (air) Blown clean, e) 40% by weight of NaOH solution, alkali washed at 80 ° C for 1 minute, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then at 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) 160 kg of aluminum oxide powder (A1), 40 kg of titanium oxide powder and 50 kg of modified PFA powder (A1) were mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the conditions of the plasma spray coating treatment are 45 kW of the spraying power of the plasma sprayer, 580 A of the spraying current, 45 L / min of the flow of argon gas in the working gas, 4 L / min of the flow of hydrogen gas, and 6 g / of the powder mixture. min, the spray distance between the plasma sprayer and the base member is 100 mm, the spray angle is 80 ° ± 1 °, and the sprayer moving speed is 80 mm / s. Thus, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S1.

As a result of observing the cross-section and the longitudinal cross-section of the manufactured non-stick coating layer (S1) at different magnifications with an electron microscope, the non-stick coating layer simultaneously contains ceramic particles and fluororesin particles, and ceramic particles and fluororesin particles are interleaved. (Adhesive) Distributed and integrated to form a non-stick coating layer. The lateral diameter and thickness of the particulate material in the non-stick coating layer were measured through the method of measuring the area division (10 areas of each particle are counted and 5 areas are randomly selected). As a result of measurement and statistics, in the non-stick coating layer (S1), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 98 to 162 μm, and the thickness (D ₁ ) is distributed within the range of 3.2 to 4.2 μm, 1 / 4R ₁ ² D ₁ is distributed within the range of 0.9Х10 ⁴ ~ 2.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed within the range of 134 ~ 198μm, and the thickness (D ₂ ) ranges from 3.3 ~ 3.6μm Within the range, and 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) 125 kg of aluminum oxide powder (A1), 25 kg of titanium oxide powder, and 50 kg of modified PFA powder (A2) were mixed and dried at 100 ° C. for 1.5 hours to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the conditions of the plasma spray coating treatment are 40 kW of spray power of the plasma sprayer, 560 A of spray current, 40 L / min of the flow rate of argon gas in the working gas, and 3 L / min of the flow rate of hydrogen gas, and the input amount of the powder mixture is 7 g. / min, the spray distance between the plasma sprayer and the base member is 110 mm, the spray angle is 80 ° ± 1 °, and the sprayer moving speed is 85 mm / s. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S2.

As a result of measurement and statistics, in the non-stick coating layer (S2), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 92 to 154, and the thickness (D ₁ ) is distributed within the range of 3.6 to 4.8 μm, 1 / 4R ₁ ² D ₁ is distributed in the range of 0.9Х10 ⁴ ~ 2.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed in the range of 92 ~ 154μm, and the thickness (D ₂ ) is 3.5 ~ 4.2μm Within, 1 / 4R ₂ ² D ₂ was distributed within the range of 0.9Х10 ⁴ ~ 2.0Х10 ⁴ .

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) 192 kg of aluminum oxide powder (A1), 58 kg of titanium oxide powder, and 50 kg of modified PFA powder (A1) were mixed and dried at 100 ° C. for 1.5 hours to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the conditions of the plasma spray coating treatment are 45kW of the spraying power of the plasma sprayer, 600A of spraying current, 50L / min of the flow of argon gas in the working gas, 5L / min of the flow of hydrogen gas, and 5g / of the powder mixture min, the spray distance between the plasma sprayer and the base member is 90 mm, the spray angle is 80 ° ± 1 °, and the sprayer moving speed is 75 mm / s. As a result, a non-stick coating layer having a thickness of 200 μm is formed, and is designated as S3.

As a result of measurement and statistics, in the non-stick coating layer (S3), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 108 to 182 μm, and the thickness (D ₁ ) is distributed within the range of 2.6 to 3.8 μm, 1 / 4R ₁ ² D ₁ is distributed in the range of 0.9Х10 ⁴ ~ 2.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed in the range of 138 ~ 216μm, and the thickness (D ₂ ) is 2.9 ~ 3.4μm Within the range, 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Example 4

According to the method of Example 1, the difference is that in the procedure (3), 200 kg of aluminum oxide powder (A1) and 50 kg of modified PFA powder (A1) are mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture to obtain a thickness of 200 A non-stick coating layer having a thickness of µm is formed, and is designated S4.

As a result of measurement and statistics, in the non-stick coating layer (S4), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 98 to 142 μm, and the thickness (D ₁ ) is distributed within the range of 3.2 to 3.8 μm, 1 / 4R ₁ ² D ₁ is distributed within the range of 0.9Х10 ⁴ ~ 1.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed within the range of 132 ~ 200μm, and the thickness (D ₂ ) ranges from 3.3 ~ 3.6μm Within the range, and 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Example 5

According to the method of Example 4, the difference is that in the procedure (3), a nonstick coating layer is formed by replacing the aluminum oxide powder (A1) with the same amount of the aluminum oxide powder (A2), denoted by S5.

As a result of measurement and statistics, in the non-stick coating layer (S5), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 130 to 185 μm, and the thickness (D ₁ ) is distributed within the range of 4.6 to 5.2 μm, 1 / 4R ₁ ² D ₁ is distributed in the range of 2.3Х10 ⁴ ~ 3.9Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed in the range of 134 ~ 200μm, and the thickness (D ₂ ) is 3.3 ~ 3.6μm Within the range, and 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 500 A, the flow rate of hydrogen gas in the working gas is 2 L / min, and the flow rate of argon gas is 35 L / min. , Spraying distance is 80, to form a non-stick coating layer having a thickness of 200㎛, it is denoted as S6.

As a result of measurement and statistics, in the non-stick coating layer (S6), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 80 to 135 μm, and the thickness (D ₁ ) is distributed within the range of 5.0 to 6.4 μm, 1 / 4R ₁ ² D ₁ is distributed in the range of 0.9Х10 ⁴ ~ 2.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed in the range of 108 ~ 165μm, and the thickness (D ₂ ) is in the range of 4.9 ~ 5.4μm Within the range, and 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of hydrogen gas in the working gas is 6 L / min, and the flow rate of argon gas is 55 L / min. , Spraying distance is 80mm to form a non-stick coating layer having a thickness of 200㎛, it is referred to as S7.

As a result of measurement and statistics, in the non-stick coating layer (S7), the lateral diameter (R ₁ ) of the ceramic particles is distributed within the range of 134 to 225 μm, and the thickness (D ₁ ) is distributed within the range of 1.6 to 2.4 μm, 1 / 4R ₁ ² D ₁ is distributed within the range of 0.9Х10 ⁴ ~ 2.6Х10 ⁴ , the lateral diameter (R ₂ ) of the fluororesin particles is distributed within the range of 180 ~ 285μm, and the thickness (D ₂ ) ranges from 1.6 ~ 2.0μm Within the range, and 1 / 4R ₂ ² D ₂ was distributed within the range of 1.6Х10 ⁴ ~ 3.2Х10 ⁴ .

Comparative Example 1

According to the method of Example 1, the difference is that in step (3), the modified PFA powder (A1) is not added and a non-stick coating layer having a thickness of 200 µm is formed.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer of the procedures (3) to (4) is usually performed by electrostatic spraying using PFA powder (ACX-33 powder of Daikin PFA). It is to form a PFA non-stick coating layer (D1) on the surface of the base member. Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow pressure is 0.45 MPa, the spray pressure is 0.4 MPa, and the spray coating layer thickness is 40 μm, spraying After the drying is done in an infrared electric furnace, and dried for 10 minutes at a low temperature section of 120 ℃, and insulated for 20 minutes at a high temperature section of 400 ℃.

Comparative Example 3

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: The spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4 MPa, spray angle is 70 °, spray distance is 35 cm, film layer thickness is 30 μm, dry solidification temperature is 420 ° C. and insulated for 15 minutes.

Comparative Example 4

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Base oil spray: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70 °, the film layer thickness is 10μm, and after completion of spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

[Table 13]

Table 14

Table 15

Looking at the results of Tables 13 to 15, in the method of manufacturing a non-stick coating layer using the plasma spray coating technology of the present invention, by spraying a layer of non-stick coating on the surface of the base member using a mixture of PFA powder and ceramic powder , It can be seen that a non-stick coating layer having excellent performance can be obtained, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when comparing Example 1 with the results of Examples 4 and 5, the surface of the non-stick coating layer is obtained by using a mixture of aluminum oxide and titanium oxide (in particular, a mixture having a weight ratio of 1: (0.05 to 0.4)) as ceramic powder. It can be seen that it is advantageous to further improve the hardness.

Here, when comparing Example 1 with Examples 7 and 8, the specified plasma spray coating treatment conditions (that is, the spray power is 40-50 kW, the spray current is 560-600 A, and the flow rate of the main gas in the working gas is 40 ~ 50L / min, the flow rate of the auxiliary gas is 3 ~ 5L / min), it can be seen that the surface hardness of the non-stick coating layer, bonding strength, scratch resistance, corrosion resistance, wettability and service life can be further improved.

Hereinafter, a sixth embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

The aluminum oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size (D50) is 32 μm, and the fluidity is 12 s / 50 g.

The titanium oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size (D50) is 38 µm, and the fluidity is 18 s / 50 g.

Usually, PFA powder, modified PFA powder (A1) and modified PFA powder (A2) were used as those used in the second embodiment.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 After sand blasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa to make the surface roughness (Ra) 3 μm, the powder particles remaining on the inner surface of the base member of the pot with air flow (air) Blown clean, e) 40% by weight of NaOH solution, alkali washed at 80 ° C for 1 minute, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then at 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through a plasma spray coating treatment using a mixture having a weight ratio of 5: 1 of aluminum oxide powder and titanium oxide powder and a modified PFA powder (A1) as a raw material. Here, the conditions of the plasma spray coating treatment are 40kW of the spraying power of the plasma sprayer, 625A of the spraying current, 45L / min of the flow rate of argon gas in the working gas, and 4L / min of the flow rate of the hydrogen gas, between the plasma sprayer and the base member. The spray distance is 80mm, the spray angle is 80 ° ± 1 °, the spray speed of the sprayer is 80mm / s, and among the flame stems formed in the plasma sprayer, the aluminum oxide powder is located at a distance D1 (1/4 of the flame stem length) from the outlet of the sprayer. A mixture of and titanium oxide powder is introduced, and the input amount is 6 g / min, and the modified PFA powder (A1) is added at a distance D2 (1/2 of the flame stem length) from the outlet of the atomizer, and the input amount is 1.2 g / min. Thus, a non-stick coating layer having a thickness of 200 μm is formed.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through a plasma spray coating treatment using a mixture in which the weight ratio of aluminum oxide powder and titanium oxide powder is 2.5: 1 and modified PFA powder (A2) as raw materials. Here, the conditions of the plasma spray coating treatment are 35kW of the spraying power of the plasma sprayer, 620A of the spraying current, 40L / min of the flow rate of argon gas in the working gas, and 3L / min of the flow rate of the hydrogen gas, between the plasma sprayer and the base member. The spray distance is 85mm, the spray angle is 80 ° ± 1 °, the spray speed of the sprayer is 85mm / s, and among the flame stems formed in the plasma sprayer, the distance between the outlet of the sprayer and the distance D1 (1/3 of the flame stem length) is aluminum oxide powder. A mixture of and titanium oxide powder is introduced, and the input amount is 5 g / min, and the modified PFA powder (A2) is added at a distance D2 (1/3 of the flame stem length) from the outlet of the atomizer, and the input amount is 1.5 g / min. Thus, a non-stick coating layer having a thickness of 200 μm is formed.

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through a plasma spray coating treatment using a mixture in which the weight ratio of the aluminum oxide powder and the titanium oxide powder is 10: 1 and the modified PFA powder (A1) as a raw material. Here, the conditions of the plasma spray coating treatment are 45 kW of spray power of the plasma sprayer, 630 A of spray current, 50 L / min of the flow rate of argon gas in the working gas, and 5 L / min of the flow rate of the hydrogen gas, between the plasma sprayer and the base member. The spray distance of 75mm, the spray angle of 80 ° ± 1 °, the spray speed of the sprayer is 75mm / s, and among the flame stems formed in the plasma sprayer, the distance between the outlet of the sprayer and the distance D1 (1/4 of the flame stem length) is aluminum oxide powder. A mixture of and titanium oxide powder is introduced, and the input amount is 7 g / min, and the modified PFA powder (A1) is introduced at a distance D2 (1/2 of the flame stem length) from the outlet of the atomizer, and the input amount is 1 g / min. Thus, a non-stick coating layer having a thickness of 200 μm is formed.

Example 4

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. A modified non-stick coating layer having a thickness of 200 µm is formed by introducing modified PFA powder (A1) at a distance D2 (2/3 of the flame stem length) from the outlet.

Example 5

According to the method of Example 1, the difference is that, in the procedure (3), aluminum oxide powder is introduced at a distance D1 (1/3 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. A modified non-stick coating layer having a thickness of 200 µm is formed by introducing modified PFA powder (A1) at a distance D2 (1/2 of the flame stem length) from the outlet.

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. A modified non-stick coating layer having a thickness of 200 µm is formed by introducing modified PFA powder (A1) at a distance D2 (5/6 of the flame stem length) from the outlet.

Example 7

According to the method of Example 1, the difference is that in the procedure (3), a mixture of aluminum oxide powder and titanium oxide powder is replaced with an aluminum oxide powder of the same input amount to form a non-stick coating layer having a thickness of 200 μm.

Example 8

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 600 A, the flow rate of argon gas in the working gas is 35 L / min, and the flow rate of hydrogen gas is 2 L / min. As it forms a non-stick coating layer having a thickness of 200㎛.

Example 9

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of argon gas in the working gas is 55 L / min, and the flow rate of hydrogen gas is 6 L / min. As it forms a non-stick coating layer having a thickness of 200㎛.

Comparative Example 1

According to the method of Example 1, the difference is that in step (3), the modified PFA powder (A1) is not added and a non-stick coating layer having a thickness of 200 µm is formed.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer of the procedures (3) to (4) is usually performed by electrostatic spraying using PFA powder (ACX-33 powder of Daikin PFA). It is to form a PFA non-stick coating layer (D1) on the surface of the base member. Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow pressure is 0.45 MPa, the spray pressure is 0.4 MPa, and the spray coating layer thickness is 40 μm, spraying After the drying is done in an infrared electric furnace, and dried for 10 minutes at a low temperature section of 120 ℃, and insulated for 20 minutes at a high temperature section of 400 ℃.

Comparative Example 3

The PTFE non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: The spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4 MPa, spray angle is 70 °, spray distance is 35 cm, film layer thickness is 30 μm, dry solidification temperature is 420 ° C. and insulated for 15 minutes.

Comparative Example 4

A ceramic non-stick coating layer is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Base oil spray: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70 °, the film layer thickness is 10μm, and after spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

Table 16

Table 17

Table 18

Looking at the results of Tables 16 to 18, in the method of manufacturing a non-stick coating layer using the plasma spray coating technology of the present invention, by spraying a layer of non-stick coating on the surface of the base member using a mixture of PFA powder and ceramic powder , It can be seen that a non-stick coating layer having excellent performance can be obtained, and the obtained non-stick coating layer has high surface hardness and bonding strength, good scratch resistance, corrosion resistance and wettability, and long service life.

Here, when comparing Example 1 with the results of Examples 4 to 6, the ceramic powder and the fluororesin powder have a specific interval (i.e., 1 / 6≤D2 to D1≤ 1/2 of the flame stem length) , Preferably it is added within 1 / 4≤D2 ~ D1≤1 / 3 of the flame stem length of the flame stem length, so it can be seen that the surface hardness and wettability of the non-stick coating layer can be more comprehensively improved. .

Here, when comparing Example 1 with the results of Example 7, the surface hardness of the non-stick coating layer is determined by using a mixture of aluminum oxide and titanium oxide (especially, a mixture having a weight ratio of (2.5 to 10): 1) as a ceramic powder. It can be seen that it is advantageous for further improvement.

Here, when comparing Example 1 with Examples 8 to 9, the specified plasma spray coating treatment conditions (that is, the spray power is 35 to 45 kW, the spray current is 620 to 630 A, and the flow rate of the main gas in the working gas is 40) It can be seen that ~ 50L / min, and the flow rate of the auxiliary gas is 3 ~ 5L / min), which can further improve the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability and service life of the non-stick coating layer.

Hereinafter, a seventh embodiment of the present invention will be described through examples.

In the examples below, a description of the raw materials used is as follows.

The aluminum oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size (D50) is 35 µm, and the fluidity is 14 s / 50 g.

The titanium oxide powder was purchased from Beijing Sunyao Technology Development Co., Ltd., the particle size (D50) is 42 μm, and the fluidity is 20s / 50g.

Usually, PFA powder, modified PFA powder (A1) and modified PFA powder (A2) were used as those used in the second embodiment.

Example 1

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 After sand blasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa to make the surface roughness (Ra) 3 μm, the powder particles remaining on the inner surface of the base member of the pot with air flow (air) Blown clean, e) 40% by weight of NaOH solution, alkali washed at 80 ° C for 1 minute, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then at 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder and modified PFA powder (A1) as raw materials. Here, the conditions of the plasma spray coating treatment are 40 kW of the spraying power of the plasma sprayer, 600 A of spraying current, 45 L / min of the flow rate of argon gas in the working gas, and 4 L / min of the flow rate of the hydrogen gas, between the plasma sprayer and the base member. The spray distance is 100mm, the spray angle is 80 ° ± 1 °, the spray speed of the sprayer is 80mm / s, and among the flame stems formed in the plasma sprayer, the aluminum oxide powder is located at a distance D1 (1/4 of the flame stem length) from the outlet of the sprayer. The input amount is 4.2 g / min, and the modified PFA powder (A1) is placed at a distance D2 (1/2 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 2.8 g / min. Thus, a composite coating layer having a thickness of 200 µm is formed, and is designated as P1.

(4) The base member of the aluminum pot on which the composite coating layer is formed is heat-treated at 430 ° C. for 15 minutes to form a non-stick coating layer having a thickness of 200 μm, denoted by S1.

Example 2

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 100 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using titanium oxide powder and modified PFA powder (A2) as raw materials. Here, the conditions of the plasma spray coating treatment are the plasma sprayer's spraying power is 35 kW, the spraying current is 580 A, the flow rate of argon gas in the working gas is 40 L / min, and the flow rate of hydrogen gas is 3 L / min, between the plasma sprayer and the base member. The spray distance of 110mm, the spray angle of 80 ° ± 1 °, the spray speed of the sprayer is 85mm / s, and among the flame stems formed in the plasma sprayer, the titanium oxide powder is located at a distance D1 (1/3 of the flame stem length) from the outlet of the sprayer. The input amount is 5 g / min, and the modified PFA powder (A2) is placed at a distance D2 (2/3 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 2.5 g / min. Thus, a composite coating layer having a thickness of 200 μm is formed, and is designated as P2.

(4) The base member of the aluminum pot on which the composite coating layer is formed is heat treated at 405 ° C. for 30 minutes to form a non-stick coating layer having a thickness of 200 μm, which is denoted as S2.

Example 3

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) According to the method of Example 1, the base member (thickness is 2.5 mm) of the aluminum pot is pretreated.

(2) The base member surface obtained in the procedure (1) is preheated to 150 ° C.

(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using aluminum oxide powder and modified PFA powder (A1) as raw materials. Here, the conditions of the plasma spray coating treatment are 45 kW of the spraying power of the plasma sprayer, 620 A of spraying current, 50 L / min of the flow rate of argon gas in the working gas, and 5 L / min of the flow rate of the hydrogen gas, between the plasma sprayer and the base member. The spray distance is 90mm, the spray angle is 80 ° ± 1 °, the spray speed of the sprayer is 75mm / s, and among the flame stems formed in the plasma sprayer, the distance between the outlet of the sprayer and the distance D1 (1/4 of the flame stem length) is aluminum oxide powder. The input amount is 3.5 g / min, and the modified PFA powder (A1) is placed at a distance D2 (1/2 of the length of the flame stem) from the outlet of the atomizer, and the input amount is 3.5 g / min. Thus, a composite coating layer having a thickness of 200 µm is formed, and is designated as P3.

(4) The base member of the aluminum pot on which the composite coating layer is formed is heat treated at 440 ° C. for 5 minutes to form a non-stick coating layer having a thickness of 200 μm, which is denoted as S3.

Example 4

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame among the flame stems formed in the plasma sprayer, A modified non-stick coating layer having a thickness of 200 µm is formed by inserting modified PFA powder (A1) at a distance D2 (2/3 of the length of the flame stem) from the exit, and is designated as S4.

Example 5

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/3 of the length of the flame stem) from the outlet of the atomizer among the flame stems formed in the plasma atomizer. A modified non-stick coating layer having a thickness of 200 µm is formed by introducing modified PFA powder (A1) at a distance D2 (1/2 of the length of the flame stem) from the outlet, and is designated S5.

Example 6

According to the method of Example 1, the difference is that in the procedure (3), the aluminum oxide powder is introduced at a distance D1 (1/4 of the length of the flame stem) from the outlet of the flame among the flame stems formed in the plasma sprayer, A modified non-stick coating layer having a thickness of 200 µm is formed by inserting modified PFA powder (A1) at a distance D2 (5/6 of the flame stem length) from the exit, and designated S6.

Example 7

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 30 kW, the spray current is 500 A, the flow rate of hydrogen gas in the working gas is 2 L / min, and the flow rate of argon gas is 35 L / min. As a phosphorus condition, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S7.

Example 8

According to the method of Example 1, the difference is that in the procedure (3), the spray power of the plasma atomizer is 50 kW, the spray current is 650 A, the flow rate of hydrogen gas in the working gas is 6 L / min, and the flow rate of argon gas is 55 L / min. As a phosphorus condition, a non-stick coating layer having a thickness of 200 µm is formed, and is designated as S8.

Example 9

This embodiment is intended to describe a method of manufacturing a non-stick coating layer using plasma spray coating.

(1) The base member (thickness is 2.5 mm) of the aluminum pot is pretreated. Here, the pre-treatment method is a) removing oil at 55 ° C. for 8 minutes, b) washing with deionized water, c) drying at 100 ° C. for 5 minutes, d) using a brown gold wire of 60 to 80 mesh, 0.6 Powder particles remaining on the inner surface of the base member of the pot by airflow (air) after the surface roughness (Ra) is 3 µm by sand blasting the inner surface of the base member of the aluminum pot at a spray air pressure of MPa. And cleanly blown, e) alkali-washed at 40 ° C for 1 minute with 40% by weight NaOH solution, f) neutralized with 20% by weight nitric acid solution for 3 minutes, g) washed with deionized water, and then 300 ° C And drying for 12 minutes.

(2) The surface of the base member obtained in the procedure (1) is preheated to 120 ° C.

(3) 160 kg of aluminum oxide powder, 40 k of titanium oxide powder and 50 kg of modified PFA powder (A1) were mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture. Using the powder mixture as a raw material, a non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment. Here, the conditions of the plasma spray coating treatment are 45 kW of the spraying power of the plasma atomizer, 600 A of spraying current, 45 L / min of the flow rate of argon gas in the working gas, 4 L / min of the flow rate of the hydrogen gas, and the input amount of the powder mixture is 6 g / min, the spray distance between the plasma sprayer and the base member is 100 mm, the spray angle is 80 ° ± 1 °, and the sprayer moving speed is 80 mm / s, forming a composite coating layer having a thickness of 200 μm, and is designated as P9.

(4) The base member of the aluminum pot on which the composite coating layer is formed is heat treated at 425 ° C. for 10 minutes to form a non-stick coating layer having a thickness of 200 μm, which is denoted as S9.

Example 10

According to the method of Example 1, the difference is that in the procedure (3), 200 kg of aluminum oxide powder and 50 kg of modified PFA powder (A1) are mixed and dried at 110 ° C. for 1 hour to obtain a powder mixture to form a non-stick coating layer. , S10.

Comparative Example 1

According to the method of Example 1, the difference is that in the procedure (3), a non-stick coating layer having a thickness of 200 μm is formed without adding the modified PFA powder (A1), and is designated as D1.

Comparative Example 2

According to the method of Example 1, the difference is that the method of forming the non-stick coating layer (denoted as D2) of the procedures (3) to (4) is usually performed on the surface of the base member by electrostatic spraying using PFA powder. It is to form the PFA non-stick coating layer (D2). Here, the conditions of the electrostatic spray treatment are spraying the powder using an electrostatic sprayer, the voltage is 35 kV, the electrostatic current is 15 μA, the flow pressure is 0.45 MPa, the spray pressure is 0.4 MPa, and the spray coating layer thickness is 40 μm, spraying After the drying is done in an infrared electric furnace, and dried for 10 minutes at a low temperature section of 120 ℃, and insulated for 20 minutes at a high temperature section of 400 ℃.

Comparative Example 3

The PTFE non-stick coating layer (labeled D3) is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include fluororesins, adhesives, pigments and auxiliaries, and surface oils include fluororesins, abrasion resistant particles and film forming aids. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 85 ° C.

(3) Spraying base oil: The spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 30 cm, the film layer thickness is 20 μm, the drying temperature is 130 ° C. and insulated for 12 minutes.

(4) Surface oil spraying: spray pressure is 0.4 MPa, spray angle is 70 °, spray distance is 35 cm, film layer thickness is 30 μm, dry solidification temperature is 420 ° C. and insulated for 15 minutes.

Comparative Example 4

A ceramic non-stick coating layer (designated as D4) is spray-formed using an air pressure spraying method. The coating layer includes a base layer and a surface layer. Base oils include adhesives, pigments and auxiliaries, and surface oils include silica oxide and aluminum oxide. Specific procedures include the following procedures.

(1) According to the procedure (1) of Example 1, the base member of the aluminum pot is pretreated.

(2) The surface of the base member obtained in the procedure (1) is preheated to 60 ° C.

(3) Base oil spray: the spray pressure is 0.3 MPa, the spray angle is 70 °, the spray distance is 25 cm, the film layer thickness is 25 μm, the pre-drying temperature is 70 ° C. and insulated for 10 minutes.

(4) Surface oil spray: the spray pressure is 0.3MPa, the spray distance is 25cm, the spray angle is 70 °, the film layer thickness is 10μm, and after completion of spraying, it is sintered at 280 ℃ and kept warm for 15 minutes.

Test example

The coating method was used to test the surface hardness of the coating layer, bonding strength, porosity, spray efficiency, scratch resistance, acid resistance, alkali resistance, salt resistance and abrasion resistance and wettability, and the results are shown in the following table.

Table 19

Table 20

Table 21

Looking at the results of Tables 19 to 21, the composite coating layer itself manufactured using the plasma spray coating technology of the present invention has high surface hardness and bonding strength, has good scratch resistance, corrosion resistance and wettability, and has long service life advantages, and the composite coating layer It can be seen that the heat treatment is performed to maintain the hardness of the surface of the coating layer, and to further improve the bonding strength and wettability (hydrophobic nonstick property) of the coating layer.

Here, when comparing Example 1 with the results of Examples 4 to 6, the ceramic powder and the fluororesin powder have a specific interval (i.e., 1 / 6≤D2 to D1≤ 1/2 of the flame stem length) , Preferably it is added within 1 / 4≤D2 ~ D1≤1 / 3 of the flame stem length of the flame stem length, so it can be seen that the surface hardness and wettability of the non-stick coating layer can be more comprehensively improved. .

Here, when comparing Example 1 with Examples 7 and 8, the specified plasma spray coating treatment conditions (that is, the spray power is 35 to 45 kW, the spray current is 620 to 630 A, and the flow rate of the main gas in the working gas is 40) It can be seen that at ~ 50 L / min, the flow rate of the auxiliary gas is 3 to 5 L / min), the surface hardness, bonding strength, scratch resistance, corrosion resistance, wettability, and service life of the non-stick coating layer can be further improved.

Here, when Example 9 is compared with the result of Example 10, a mixture of aluminum oxide and titanium oxide (especially, the weight ratio is used) when plasma spray coating is performed using a mixed powder of ceramic powder and fluororesin powder as a raw material. It can be seen that it is advantageous to further improve the surface hardness of the non-stick coating layer by using 1: (a mixture of (0.05 to 0.4)) as a ceramic powder.

Although preferred embodiments of the present invention have been described above in detail, the present invention is not limited thereto. Various simple modifications to the technical solutions of the present invention are possible within the scope of the technical idea of the present invention, and can be combined in any other suitable manner including each technical feature, and such simple modifications and combinations are disclosed in the present invention. It should be regarded as contents, and all belong to the protection scope of the present invention.

1 Non-stick coating layer 2 Base member
10 Particulate matter 11 Ceramic particle core
12 Fluororesin material coating layer 13 Coated composite particles
13a ceramic particle core 13b fluororesin material coating layer
14 Ceramic particles 15 Fluororesin particles
16 Fluoro resin material layer 16 'Fluoro resin material coating layer
16 ′ ′ fluororesin material particles 17, 17 ′, 17 ′ ′ ceramic particles

Claims (31)

A non-stick coating layer formed on the base member and the base member and comprising a mixed layer of a ceramic material and a fluororesin material,
The non-stick coating layer includes a mixed layer of ceramic and PFA,
The manufacturing method of the non-stick coating layer
(1) The base member 2 is pretreated,
(2) heat treatment to the surface of the base member obtained in procedure (1),
(3) mixing the ceramic powder and the modified PFA powder to obtain a powder mixture, and performing a plasma spray coating process on the powder mixture to include a procedure for forming a non-stick coating layer 1 on the surface of the base member,
Here, 80% or more of the modified PFA powder has a sphericity of 70% or more,
The non-stick coating layer is an integrated layer of particulate matter,
The particulate material includes a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core. According to claim 1,
In the non-stick coating layer, the ceramic particles and PFA particles are cookware, characterized in that arranged in a manner that is interspersed and distributed. According to claim 1,
The weight ratio of PFA and ceramic is 1: (2 ~ 6),
The ceramic is cookware, characterized in that at least one of aluminum oxide and titanium oxide. According to claim 1,
The particulate material has a flat structure,
Cookware, characterized in that the thickness direction of each of the particulate materials is basically perpendicular to the plane having the non-stick coating layer. According to claim 1,
The thickness of the particulate material is 1 ~ 10㎛,
Cookware, characterized in that the maximum cross-sectional diameter of the particulate material perpendicular to the thickness direction is 50-120 μm. According to claim 1,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Selectable preheating of the surface of the base member obtained in procedure (1),
(3) a procedure of forming a non-stick coating layer on the surface of the base member through plasma spray coating treatment using ceramic powder and fluororesin powder as raw materials,
Here, in the plasma spray coating treatment procedure, a flame stem is formed using a plasma sprayer, and the ceramic powder is placed at a distance D1 from the outlet of the sprayer among the formed flame stems, and a distance D2 from the outlet of the sprayer Injecting the fluoro resin powder,
Here, D2 is a cookware characterized in that it is larger than D1. According to claim 1,
The non-stick coating layer is an integrated layer of a particulate material having a flat structure,
The particulate material includes a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core,
The thickness D of the ceramic particle core is distributed in the range of 1 to 10 μm, the transverse diameter R is distributed in the range of 50 to 400 μm, and the 1 / 4R²D is distributed in the range of 8000 to 40000 μm³. The method of claim 7,
Cookware, characterized in that the thickness D of the ceramic particle core is distributed in the range of 2 to 5 μm, and the lateral diameter R is distributed in the range of 80 to 280 μm. The method of claim 7,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Preheat the base member surface obtained in the procedure (1) to 80-150 ° C,
(3) a procedure of forming a non-stick coating layer on the surface of the base member through plasma spray coating treatment using ceramic powder and fluororesin powder as raw materials,
Here, the particle size of the ceramic powder is distributed in the range of 35 ~ 65μm, the conditions of the plasma spray coating treatment is 30 ~ 50Kw of the spraying power of the plasma sprayer, 500 ~ 650A spraying current, the flow rate of the main gas in the working gas is 35 ~ 55L / min, the flow rate of the auxiliary gas is 2 ~ 6L / min, the spraying distance is 80 ~ 120mm, and among the flame stems formed in the plasma sprayer, ceramic powder is introduced at a distance D1 from the outlet of the sprayer and the outlet of the sprayer The cookware characterized in that the fluororesin powder is introduced at a distance from D2, where D2 is greater than D1. The method of claim 1 or 7,
The thickness of one side of the fluororesin material coating layer in the particulate material is 0.2 to 2 μm,
The non-stick coating layer contains 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of itself,
In the ceramic particle core, the ceramic material is at least one of aluminum oxide and titanium oxide, and the fluororesin material in the coating layer of the fluororesin material is at least one of PTFE and PFA. According to claim 1,
The non-stick coating layer is an integrated layer of particulate matter,
The particulate material includes ceramic particles, fluororesin particles and coated composite particles,
The coated wearable composite particles include a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core. The method of claim 11,
The particulate material has a flat structure,
Cookware, characterized in that the thickness direction of each of the particulate materials is basically perpendicular to the plane having the non-stick coating layer. The method of claim 11,
In the non-stick coating layer, ceramic particles, fluororesin particles, and coated composite particles are interposed by being interposed and cooked. The method of claim 11,
The thickness of the particulate material is 1 ~ 10㎛,
Cookware, characterized in that the diameter of the largest cross-section perpendicular to the thickness direction of the particulate material is 30 ~ 500㎛. The method of claim 11,
Among the coated composite particles, the thickness of one side of the fluororesin material coating layer is 0.2 to 2 μm,
The non-stick coating layer is an integrated layer of particulate material formed through plasma spray coating,
The ceramic material in the ceramic particle core of the ceramic particle and the coated composite particle is at least one of aluminum oxide and titanium oxide, and the fluororesin material in the fluororesin particle and the coated composite particle is at least one of PTFE and PFA. Cookware characterized by being. The method of claim 11,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Preheat the surface of the base member obtained in the procedure (1) to 80 ~ 150 ℃,
(3) mixing the ceramic powder, the fluororesin powder and the coated composite powder to form a powder mixture, and using the powder mixture as a raw material, a procedure of forming a non-stick coating layer on the surface of the base member through plasma spray coating treatment And
Here, the powder mixture is a cookware, characterized in that it comprises a ceramic particle core and a fluororesin material coating layer covering the outer peripheral surface of the ceramic particle core. According to claim 1,
The non-stick coating layer is an integrated layer of a particulate material having a flat structure,
The particulate material includes ceramic particles and fluororesin particles interspersed and distributed,
The cookware, characterized in that the thickness D of the particulate material is 1-10 μm, the transverse diameter R is 40-530 μm, and the 1 / 4R²D is 5000-70000 μm³. The method of claim 17,
The thickness D ₁ of the ceramic particles is 2 to 5 μm, the transverse diameter R ₁ is 80 to 280 μm, and the 1/4 R ₁ ²D ₁ is 8000 to 40000 μm³,
Cookware, characterized in that the thickness D ₂ of the fluororesin particles is 1-5 μm, the transverse diameter R ₂ is 60-500 μm, and the 1 / 4R ₂ ²D ₂ is 5000-70000 μm³. The method of claim 17,
The weight ratio of the fluororesin particles and the ceramic particles in the non-stick coating layer is 1: (2-6),
Cookware, characterized in that the fluororesin material in the fluororesin particles is at least one of PTFE and PFA. The method of claim 17,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Preheat to 80-150 ° C on the surface of the base member obtained in the procedure (1),
(3) a process of forming a non-stick coating layer on the surface of the base member by mixing a ceramic powder and a fluororesin powder to obtain a powder mixture, and subjecting the powder mixture to a plasma spray coating treatment,
Here, the particle size of the ceramic powder is distributed in the range of 35 ~ 65μm, the particle size of the fluoro resin powder is distributed within the range of 30 ~ 80μm, the conditions of the plasma spray coating treatment is 30 ~ 50kW, the spray power of the plasma sprayer, Cookware characterized in that the spray current is 500 ~ 650A, the main gas flow rate of 35 ~ 55L / min, the auxiliary gas flow rate is 2 ~ 6L / min, the spray distance is 80 ~ 120mm. According to claim 1,
The non-stick coating layer
Contains fluororesins dispersed between ceramic particles and ceramic particles,
Cookware, characterized in that it comprises 80 to 95% by weight of ceramic particles and 5 to 20% by weight of fluoro polyester material based on the total weight of the non-stick coating layer. The method of claim 21,
The ceramic particles include at least one of aluminum oxide particles and titanium oxide particles,
The cookware, characterized in that the fluororesin material is at least one of PTFE and PFA. The method of claim 21,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Selective preheating is performed on the surface of the base member obtained in the procedure (1),
(3) a procedure of forming a non-stick coating layer on the surface of the base member by performing plasma spray coating treatment using ceramic powder and fluororesin powder as raw materials,
Here, in the plasma spray coating treatment procedure, a flame stem is formed using a plasma sprayer, and among the formed flame stems, ceramic powder is introduced at a distance D1 from the outlet of the sprayer, and a fluororesin powder at a distance D2 from the outlet of the sprayer And
Here, D2 is larger than D1, and the weight ratio of the amount of the fluororesin powder to the amount of the ceramic powder is (0.14 to 0.3): 1, cookware. According to claim 1,
The non-stick coating layer is a cookware, characterized in that it comprises a fluororesin material layer and ceramic particles dispersed inside the fluororesin material layer. The method of claim 24,
The ceramic particles have a flat structure, the thickness of the ceramic particles is 1 ~ 10㎛, the lateral diameter is 50 ~ 200㎛,
The non-stick coating layer contains 55 to 90% by weight of ceramic particles and 10 to 45% by weight of fluororesin material based on the total weight of the non-stick coating layer,
The ceramic material in the ceramic particles is at least one of aluminum oxide and titanium oxide, and the fluororesin material in the fluororesin material layer is at least one of PTFE and PFA. The method of claim 24,
The manufacturing method of the non-stick coating layer
(1) The base member is pretreated,
(2) Selective preheating is performed on the surface of the base member obtained in the procedure (1),
(3) A non-stick coating layer is formed on the surface of the base member through plasma spray coating treatment using ceramic powder and fluororesin powder as raw materials,
(4) includes a procedure of heat treatment for the composite coating layer formed on the surface of the base member,
Here, the heat treatment temperature of the cookware, characterized in that 0 ~ 50 ℃ greater than the melting point of the fluororesin. The method of claim 1, 7, 11, 17, 21 or 24,
Cookware, characterized in that the thickness of the base member is 0.5 ~ 6mm, the thickness of the non-stick coating layer is 50 ~ 2000㎛. A cooking apparatus comprising the cookware of any one of claims 1 to 9. delete delete delete

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