KR102467470B1 - Manufacturing method for kitchen appliances having excellent heat resistance with discoloration resistance and kitchen appliances prepared using the same - Google Patents

Abstract

The present invention relates to a cookware manufacturing method having excellent discoloration resistance and heat resistance features and cookware manufactured thereby. In one embodiment, the cookware manufacturing method comprises the following steps of: forming a color coating layer by applying a color coating agent having a primary color or mixed color onto at least a portion of a surface of a metal substrate; and forming a top coating layer by applying a transparent top coating agent onto a surface of the color coating layer to maintain light and a color of the color coating layer without changes.

Description

Method for manufacturing cookware with excellent discoloration resistance and heat resistance and cookware manufactured thereby

The present invention relates to a method for manufacturing cookware having excellent discoloration resistance and heat resistance, and to cookware manufactured thereby.

Cooking utensils for heating, such as frypans, grilling plates, and pots, are made of metal materials such as stainless steel, copper, and aluminum. Among them, stainless materials have relatively low thermal conductivity, so copper and aluminum materials are mainly used. When used, it is sometimes used by adding copper and aluminum materials to the part that is in direct contact with the heat source.

Meanwhile, when cooking food by heating cookware made of copper or aluminum, since it is easily oxidized or discolored by a heat source, a coating layer having heat resistance and corrosion resistance is formed on the outer surface of the cookware. However, the appearance of the coating layer in contact with the heat source is damaged or discolored over time, and the adhesion between the coating layer and the material is lowered, causing the coating layer to easily fall off.

Background art related to the present invention is disclosed in Republic of Korea Patent Publication No. 2019-0115243 (published on October 11, 2019, title of the invention: non-stick composition for cooking utensils and non-stick layer bonding method on the surface of cookware using the same).

One object of the present invention is to provide a method for manufacturing cookware with excellent discoloration resistance, heat resistance and cold resistance.

Another object of the present invention is to provide a method for manufacturing cookware having excellent wear resistance, durability and adhesion between coating layers.

Another object of the present invention is to provide a method for manufacturing cookware with excellent mixing and dispersibility of a coating agent, excellent thermal conductivity and antifouling property.

Another object of the present invention is to provide a cookware manufactured by the cookware manufacturing method.

One aspect of the present invention relates to a method for manufacturing a cookware. In one embodiment, the cooking utensil manufacturing method includes forming a color coating layer by applying a color coating agent having a primary color or mixed color to at least a portion of the surface of a metal substrate; and forming a top coating layer by applying a transparent top coating agent to the surface of the color coating layer to maintain the light and color of the color coating layer without change.

In one embodiment, the cooking utensil manufacturing method includes forming a color coating layer by applying a color coating agent containing a first resin, a first pigment, and a first solvent to at least a portion of the surface of the metal substrate; and applying a top coating agent containing a second resin and a second solvent to the surface of the color coating layer and performing heat treatment to form a top coating layer, wherein the first resin and the second resin are each phenyl having a methoxy terminal. Silsesquioxane structures of dimethyl and methoxyphenylsiloxane may be included.

In one embodiment, the heat treatment may be performed at 220 to 330 °C.

In one embodiment, the color coating agent includes 100 parts by weight of a first resin, 5 to 40 parts by weight of a first pigment, and 20 to 80 parts by weight of a first solvent, and the top coating agent includes 100 parts by weight of a second resin and 20 parts by weight of a second solvent. -70 parts by weight.

In one embodiment, the top coating agent further includes at least one of 1 to 30 parts by weight of a brightener and 5 to 25 parts by weight of a functional component based on 100 parts by weight of the second resin, and the functional component is molybdenum oxide, a phosphate ester compound, and an alkoxy group. It may contain one or more of the silane compounds.

In one embodiment, the first solvent and the second solvent may each include one or more of an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent.

In one embodiment, before the step of forming the color coating layer, the step of pre-treating the surface of the metal substrate by grinding with sandpaper; may be further included.

Another aspect of the present invention relates to a cookware manufactured by the cookware manufacturing method. In one embodiment, the cooking utensil is a metal substrate; a color coating layer formed on at least a portion of the surface of the metal substrate and having a primary color or mixed color; and a transparent top coating layer formed on the surface of the color coating layer to maintain light and color of the color coating layer without change.

In one embodiment, the cooking utensil is a metal substrate; a color coating layer formed on at least a portion of the surface of the metal substrate; and a top coating layer formed on the surface of the color coating layer, wherein the color coating layer is formed from a color coating agent containing a first resin, a first pigment, and a first solvent, and the top coating layer is formed of a second resin and a second solvent. It is formed from a top coating agent containing, and the first resin and the second resin each include dimethyl and methoxyphenylsiloxane having a methoxy-terminated phenylsilsesquioxane structure.

The cookware manufacturing method of the present invention and the cookware manufactured thereby have excellent discoloration resistance, heat resistance, and cold resistance, and easily prevent discoloration of the color coating layer due to heat during heating by the top coating layer, so that the original color of the color coating layer It can keep its shape fixed, has excellent mixing and dispersibility of color coating agents and top coating agents, has excellent abrasion resistance, durability and adhesion between coating layers, and has excellent thermal conductivity and antifouling properties.

1 shows a method for manufacturing a cookware according to one embodiment of the present invention.
2 is a photograph of a cookware according to Example 1.

In describing the present invention, if it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator, so the definitions should be made based on the content throughout this specification describing the present invention.

Cooking utensil manufacturing method

One aspect of the present invention relates to a method for manufacturing a cookware. 1 shows a method for manufacturing a cookware according to one embodiment of the present invention. Referring to FIG. 1, the cooking utensil manufacturing method includes (S10) color coating layer forming step; and (S20) forming a top coating layer.

In one embodiment, the cooking utensil manufacturing method includes (S10) forming a color coating layer by applying a color coating agent having a primary color or mixed color to at least a portion of the surface of a metal substrate; and (S20) forming a top coating layer by applying a transparent top coating agent to the surface of the color coating layer to keep the color coating layer free of light and color change.

For example, the cookware manufacturing method may include (S10) forming a color coating layer by applying a color coating agent containing a first resin, a first pigment, and a first solvent to at least a portion of the surface of a metal substrate; and (S20) forming a top coating layer by applying a top coating agent containing a second resin and a second solvent to the surface of the color coating layer and performing heat treatment.

More specifically, the cooking utensil manufacturing method (S10) applies a color coating agent containing 100 parts by weight of a first resin, 5 to 40 parts by weight of a first pigment, and 20 to 80 parts by weight of a first solvent on at least a part of the surface of a metal substrate. to form a color coating layer; And (S20) applying a top coating agent containing 100 parts by weight of the second resin and 20 to 60 parts by weight of the second solvent on the surface of the color coating layer and heat-treating to form a top coating layer; 2 The resin may include dimethyl and methoxyphenylsiloxane having a phenylsilsesquioxane structure each having a methoxy terminal.

Hereinafter, a cooking utensil manufacturing method according to the present invention will be described in detail step by step.

(S10) Color coating layer formation step

The step is a step of forming a color coating layer by applying a color coating agent containing 100 parts by weight of a first resin, 5 to 40 parts by weight of a first pigment, and 20 to 80 parts by weight of a first solvent on at least a portion of the surface of a metal substrate.

The metal substrate can be manufactured by a conventional method. For example, the metal substrate may include one or more of aluminum (Al), aluminum alloy, copper (Cu), magnesium (Mg), aluminum-plated steel, iron (Fe), and stainless steel.

In addition, the metal substrate may form irregularities on the surface of the portion in direct contact with the heat source by cold rolling or the like.

The color coating agent may be applied to a portion of an outer circumferential surface of the metal substrate. For example, as shown in FIG. 1(a) below, the color coating layer 110 may be formed by applying a color coating agent to a portion of the surface of the metal substrate 100.

In one embodiment, one color coating layer may be formed by applying one color coating layer to the surface of a metal substrate. In another embodiment, by applying a plurality of color coating agents having different colors to the surface of the metal substrate, it is possible to form different color coating layers.

In one embodiment, prior to the step of forming the color coating layer, a step of pre-treating the surface on which the color coating layer or top coating layer of the metal substrate is applied by grinding with sandpaper may be further included. For example, the surface of the metal substrate may be pretreated by grinding using sandpaper numbered 180 to 220. During the pretreatment, adhesion of the color coating layer and the top coating layer may be excellent.

In one embodiment, before applying the color coating agent, the surface on which the color coating layer or top coating layer of the metal substrate is applied may be pretreated by grinding and then sand blasting. During the pretreatment by sand blasting, the surface area of the metal substrate is increased, so that the adhesion of the color coating layer and the top coating layer may be excellent.

The first resin includes dimethyl, methoxyphenyl siloxane with phenyl silsesquioxane (methoxy-terminated) having a methoxy-terminated phenylsilsesquioxane structure. When the first resin is included, heat resistance, cold heat resistance, and discoloration resistance of the color coating layer are excellent, and the discoloration prevention effect may be excellent even when heated by a heat source.

The first pigment may include at least one of an organic pigment, an inorganic pigment, and carbon black.

In one embodiment, the organic pigment may include one or more of color index (C.I.) Pigment Yellow, C.I. Pigment Orange, C.I. Pigment Yellow, C.I. Pigment Blue, C.I. Pigment Green, and C.I. Pigment Red.

In one embodiment, the inorganic pigment may include one or more of perylene red, manganese ferrite black, copper chromite black, bismuth vanadate, iron hydroxide yellow, chromium oxide green, and cobalt aluminate blue.

In one embodiment, the first pigment is included in an amount of 5 to 40 parts by weight based on 100 parts by weight of the first resin. When the first pigment is included in an amount of less than 5 parts by weight, the appearance of the color coating layer is deteriorated, and when it is included in an amount exceeding 40 parts by weight, mixing properties and heat resistance of the color coating agent are reduced and the color may be easily discolored when heated.

In one embodiment, the first solvent may include at least one of an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent. When the above type of solvent is included, mixing and dispersibility of the first resin and the first pigment may be excellent.

The alcohol-based solvent may include methanol, ethanol, isopropyl alcohol and isobutyl alcohol.

The aromatic hydrocarbon-based solvent may include one or more of benzene, toluene, and xylene.

The ketone-based solvent may include methyl isobutyl ketone.

In one embodiment, the first solvent may include an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent in a weight ratio of 1:0.5 to 1.5:1 to 3. When included within the above range, mixing and dispersibility of the color coating agent may be excellent, and control of curing speed and workability may be excellent.

In one embodiment, the first solvent is included in an amount of 20 to 80 parts by weight based on 100 parts by weight of the first resin. When the first solvent is included in an amount of less than 20 parts by weight, the mixing and dispersibility of the color coating agent is reduced, and when applied in an amount exceeding 80 parts by weight, the curing time of the color coating layer is delayed, and after curing of the color coating layer, defects in appearance occur or , adhesion and heat resistance may be deteriorated.

In one embodiment, the color coating agent may be dried after pad printing or application. The drying may be carried out under conditions of 40 to 150 ° C. Under the above conditions, durability of the color coating layer may be excellent. For example, it can be carried out at 40 to 60°C.

In one embodiment, the color coating layer may have a thickness of 1 to 50 μm. Adhesion, appearance, heat resistance and durability of the color coating layer may be excellent under the above thickness conditions. For example, it may be 25 to 35 μm.

Forming a primer layer by applying a primer to the surface of the pretreated metal substrate before applying the color coating agent in one sphere; may further include.

In one embodiment, the primer layer may be formed from a primer containing a fluorine-based resin.

In one embodiment, the fluorine-based resin is polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoro alkylvinyl ether copolymer (PFA) and polyvinylidene fluoride (PVDF). ) may include one or more of When the fluorine-based resin is applied, the primer layer may have excellent chemical resistance, abrasion resistance, durability and heat resistance. For example, it may include at least one of polytetrafluoroethylene (PTFE) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

In one embodiment, the primer agent may further include a solvent. The solvent may include one or more of water, alcohol having 1 to 10 carbon atoms, and the like. In one embodiment, the alcohol having 1 to 10 carbon atoms may include at least one of methanol and ethanol, but is not limited thereto.

The solvent may be included in an amount of 10 to 500 parts by weight based on 100 parts by weight of the fluorine-based resin. When included within the above range, it is easy to control the viscosity of the components of the primer, and the dispersibility and workability may be excellent.

In one embodiment, the primer may further include additives such as a surfactant, a leveling agent, and an antifoaming agent. The additive may be included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the fluorine-based resin.

In one embodiment, the thickness of the primer layer may be 5 to 30 μm. Under the above thickness conditions, the durability of the primer layer may be excellent.

(S20) Top coating layer formation step

This step is a step of forming a top coating layer by applying a top coating agent containing a second resin and a second solvent to the surface of the color coating layer and performing heat treatment, as shown in FIG. 1(b).

For example, a top coating agent containing 100 parts by weight of a second resin and 20 to 70 parts by weight of a second solvent may be applied to the surface of the color coating layer and subjected to heat treatment to form a top coating layer.

In one embodiment, the top coating layer 120 may be formed on the surface of the color coating layer 110 or on the surface of the color coating layer 110 and the metal substrate 100 as shown in FIG. 1(b) below. In another embodiment, the top coating layer 120 may be formed on the surface of the primer layer (not shown), the color coating layer 110 and the top coating layer 120 .

When the top coating layer is formed, it is possible to easily prevent discoloration of the color coating layer due to heat when cooking utensils are heated.

The second resin includes dimethyl, methoxyphenyl siloxane with phenyl silsesquioxane (methoxy-terminated) having a methoxy-terminated phenylsilsesquioxane structure. When the second resin is included, durability, heat resistance, cold resistance, and discoloration resistance of the top coating layer are excellent, and the effect of preventing discoloration may be excellent even when heated by a heat source.

In one embodiment, the second solvent may include at least one of an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent. When the solvent of the above type is included, mixing and dispersibility of the components of the top coating agent may be excellent.

The alcohol-based solvent may include methanol, ethanol, isopropyl alcohol and isobutyl alcohol.

The aromatic hydrocarbon-based solvent may include one or more of benzene, toluene, and xylene.

The ketone-based solvent may include methyl isobutyl ketone.

In one embodiment, the second solvent may include an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent in a weight ratio of 1:0.5 to 1.5:1 to 3. When included within the above range, mixing and dispersibility of the top coating agent may be excellent, and control of curing speed and workability may be excellent.

In one embodiment, the second solvent is included in an amount of 20 to 70 parts by weight based on 100 parts by weight of the second resin. When the second solvent is included in an amount of less than 20 parts by weight, the mixability and dispersibility of the top coating agent deteriorates, and when it is applied in an amount exceeding 70 parts by weight, the curing time of the top coating layer is delayed, and appearance defects occur after the top coating layer is cured. , adhesion and heat resistance may be deteriorated.

In one embodiment, the top coating agent may further include at least one of 1 to 30 parts by weight of a brightener and 5 to 25 parts by weight of a functional component based on 100 parts by weight of the second resin.

Conventional brighteners may be used.

In one embodiment, the brightener may be included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the second resin. When included in the above content, the mixability, heat resistance, and appearance of the top coating agent may be excellent.

The functional component may be included to further improve durability and scratch resistance such as interlayer adhesion and hardness of the top coating agent.

In one embodiment, the functional component may include at least one of molybdenum oxide (MoO ₃ ), a phosphoric acid ester compound, and an alkoxy silane compound.

The molybdenum oxide may be included to improve heat resistance and adhesion. In one embodiment, the molybdenum oxide may have an average particle diameter (D50) of 1 to 50 μm. Within this range, dispersibility and mixability may be excellent.

The phosphoric acid ester-based compound may be included for the purpose of improving durability and adhesion to a substrate of the top coating layer of the present invention. The phosphoric acid ester-based compound may be a phosphoric acid ester-based compound including at least one of a hydroxy group and a carboxyl group.

The alkoxy silane compound may be included to improve adhesion and durability between the metal substrate, the color coating layer and the top coating layer.

In one embodiment, the alkoxy silane is glycidoxypropyltrimethoxysilane, mercaptopropyltrimethoxysilane, methacryloylpropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, methacryloyl It may include at least one of ylpropyltriethoxysilane and glycidoxypropyltriethoxysilane.

In one embodiment, the functional component may include molybdenum oxide (MoO ₃ ), a phosphoric acid ester compound, and an alkoxy silane compound in a weight ratio of 1:2 to 3:2 to 5. When included in the weight ratio range, the mixability and dispersibility of the top coating agent may be excellent, and the heat resistance, adhesion, and durability of the top coating layer may be excellent.

In one embodiment, the top coating agent may be dried after pad printing or application. In one embodiment, the drying may be carried out under conditions of 50 to 150 ° C. Under these conditions, the durability of the top coating layer may be excellent.

In one embodiment, the top coating layer may have a thickness of 5 to 25 μm. Durability of the top coating layer may be excellent under the above thickness conditions. For example, it may be 10 to 15 μm.

In one embodiment, the heat treatment may be performed at 220 to 330 °C. Under the above conditions, the color coating agent and the top coating agent can be easily cured and have excellent durability, adhesion, discoloration resistance and heat resistance. For example, it may be made at 250 ~ 320 ℃. For example, it may be made at 280 ~ 320 ℃.

Cookware manufactured by the cooking utensil manufacturing method

Another aspect of the present invention relates to a cookware manufactured by the cookware manufacturing method. In one embodiment, the cooking utensil is a metal substrate; a color coating layer formed on at least a portion of the surface of the metal substrate and having a primary color or mixed color; and a transparent top coating layer formed on the surface of the color coating layer to maintain light and color of the color coating layer without change.

For example, the cooking utensil is a metal substrate; a color coating layer formed on at least a portion of the surface of the metal substrate; and a top coating layer formed on the surface of the color coating layer, wherein the color coating layer is formed from a color coating agent containing a first resin, a first pigment, and a first solvent, and the top coating layer is formed of a second resin and a second solvent. It is formed from a top coating agent containing, and the first resin and the second resin each include dimethyl and methoxyphenylsiloxane having a methoxy-terminated phenylsilsesquioxane structure.

For example, the color coating layer is formed from a color coating agent containing 100 parts by weight of a first resin, 5 to 40 parts by weight of a first pigment, and 20 to 80 parts by weight of a first solvent, and the top coating layer comprises 100 parts by weight of a second resin and It is formed from a top coating agent containing 20 to 70 parts by weight of a second solvent, and the first resin and the second resin may each include dimethyl or methoxyphenylsiloxane having a methoxy-terminated phenylsilsesquioxane structure. .

In one embodiment, the top coating layer may be formed on the surface of the color coating layer. In another embodiment, the top coating layer may be formed on the color coating layer and the surface of the metal substrate.

Since the color coating agent and the top coating agent may be the same as those described above, a detailed description thereof will be omitted.

In one embodiment, the color coating layer may have a thickness of 1 to 50 μm. Adhesion, appearance, heat resistance and durability of the color coating layer may be excellent under the above thickness conditions. For example, it may be 25 to 35 μm.

In one embodiment, the top coating layer may have a thickness of 5 to 25 μm. Durability of the top coating layer may be excellent under the above thickness condition. For example, it may be 10 to 15 μm.

In one embodiment, the top coating agent may further include at least one of 1 to 30 parts by weight of a brightener and 5 to 25 parts by weight of a functional component based on 100 parts by weight of the second resin.

The brightener may be used without limitation as long as it expresses a gloss effect without impairing the transparency of the top coating agent.

In one embodiment, the brightener may be included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the second resin. When included in the above content, the appearance may be excellent without impairing the mixability, heat resistance, and transparency of the top coating agent.

The functional component may be included to further improve durability and scratch resistance such as interlayer adhesion and hardness of the top coating agent.

In one embodiment, the functional component may include at least one of molybdenum oxide (MoO ₃ ), a phosphoric acid ester compound, and an alkoxy silane compound.

In one embodiment, the functional component may include molybdenum oxide (MoO ₃ ), a phosphoric acid ester compound, and an alkoxy silane compound in a weight ratio of 1:2 to 3:2 to 5. When included in the above weight ratio range, durability such as heat resistance, adhesion and hardness of the top coating layer may be excellent.

In one embodiment, a primer layer is further formed on the surface of the metal substrate, and at least one of a color coating layer and a top coating layer may be formed on the surface of the primer layer.

In one embodiment, the primer layer may be formed from a primer containing a fluorine-based resin.

In one embodiment, the thickness of the primer layer may be 5 to 30 μm. Under the above thickness conditions, the durability of the primer layer may be excellent.

The cookware manufacturing method of the present invention and the cookware produced thereby have excellent discoloration resistance and heat resistance, and the top coating layer easily prevents discoloration of the color coating layer due to heat when the cookware is heated, and the color coating agent and the top coating agent It has excellent mixing and dispersibility, excellent abrasion resistance, durability and adhesion between coating layers, and may have excellent thermal conductivity and antifouling properties.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention by this in any sense. Contents not described herein can be technically inferred by those skilled in the art, so descriptions thereof will be omitted.

Examples and Comparative Examples

Components used in Examples and Comparative Examples are as follows.

(1) Color coating agent

(A) First resin: Dimethyl, methoxyphenyl siloxane with phenyl silsesquioxane, methoxy-terminated, CAS number: 68957-04-0 having a methoxy-terminated phenylsilsesquioxane structure was used .

테트라하이드로-3,6-다이옥소피롤로[3,4c]피롤-1,4-다이일)비스벤조나이트릴)를 사용하였다.(B) First pigment: CI Pigment Orange 71 (3,3 as the first pigment)

tetrahydro-3,6-dioxopyrrolo[3,4c]pyrrole-1,4-diyl)bisbenzonitrile) was used.

(C) First solvent: Isobutyl alcohol, xylene, and methyl isobutyl ketone were mixed in a weight ratio of 1:1 to 1.5:1 to 1.5.

(2) Top coating agent

(D) Second Resin: (D1) Dimethyl, methoxyphenyl siloxane with phenyl silsesquioxane, methoxy-terminated, CAS number: 68957-04-0 was used. (D2) Polytetrafluoroethylene (PTFE) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP) were used.

(E) Second solvent: Isobutyl alcohol, xylene, and methyl isobutyl ketone were mixed in a weight ratio of 1:1 to 1.5:1 to 1.5.

(F) Functional component: Molybdenum oxide (MoO ₃ ), a phosphoric acid ester compound containing a carboxyl group, and an alkoxy silane compound (glycidoxypropyltriethoxysilane) were mixed and used in a weight ratio of 1:2:3.

Examples 1-2 and Comparative Examples 1-7

(1) Metal substrate preparation and pretreatment: A metal substrate was formed by a known method to form a frame portion by bending a bottom portion and an edge of the bottom portion, and a handle member was fixedly coupled to one side of the frame portion to form a handle portion. At this time, the center of the bottom part directly in contact with the heat source for heating was molded to form a plurality of circular irregularities. Then, the bottom part and the outside of the edge part of the metal substrate were pretreated by grinding with sandpaper (No. 180 to 220).

(2) Formation of a color coating layer: A color coating agent of the condition of Table 1 is applied and dried to a part of the bottom and edge of the pretreated metal substrate to form a color coating layer having a thickness of 25 to 30 μm as shown in FIG. 1 (a). formed.

(3) Formation of top coating layer: A top coating agent according to the conditions in Table 1 is applied to the pretreated bottom portion of the metal substrate and the surface of the color coating layer, and dried at 40 to 60° C. A top coating layer of 15 μm was formed.

(4) Heat treatment: The areas where the color coating layer and the top coating layer were formed were cured by heat treatment at 280 to 320° C. for 20 to 25 minutes.

Property evaluation method

With respect to Examples 1 to 2 and Comparative Examples 1 to 7, the physical properties of the composite coating layer were evaluated according to the following items, and the results are shown in Table 2 below.

(1) Appearance: Visual discoloration and cracking of the color coating layer and top coating layer of Examples and Comparative Examples were visually observed and evaluated according to the following four criteria (◎: no abnormality, ○: cracking in a very small part, △ : Some cracks X: Severe cracks).

(2) Mixability and dispersibility evaluation: Mixability and dispersibility of the color coating agents and top coating agents of Examples and Comparative Examples were visually observed and evaluated according to the following four criteria (◎: very good, ○: good, Δ: partially undispersed, X: not dispersed).

(3) Corrosion resistance evaluation: The cookware of Examples and Comparative Examples was immersed in 5% NaCl solution for 3000 hours, then taken out, and the corrosion state of the top coating layer of Examples and Comparative Examples was visually observed to determine the following four criteria It was evaluated as (◎: no coating film corrosion, ○: very little corrosion, △: some corrosion, X: severe corrosion).

(4) Coating hardness: The coating hardness of the top coating layer of Examples and Comparative Examples was evaluated using an MIT-UNI Pencil (manufactured by Mitsubishi Corporation).

(5) Adhesion evaluation: For the coating layers of Examples and Comparative Examples, adhesion between the metal substrate, the color coating layer, and the top coating layer was evaluated by a cross-cut tape peel test in accordance with JIS K 5400. The number of non-peeled crosscuts is shown with respect to the total number of crosscuts (100 pieces) formed in a size of 1.5 mm x 1.5 mm.

(6) Evaluation of abrasion resistance: Whether the surface of the cooking utensils of the above examples and comparative examples was rotated 15,000 times at a load of 3 kg and a speed of 60 rpm using a taber abrasion tester using a taber, and whether or not the coating film was damaged was confirmed and evaluated according to the following four criteria ((◎: no damage occurred, ○: a very small portion of the coating film was damaged, △: a portion of the coating film was damaged, X: most of the coating film was damaged).

(7) Evaluation of heat resistance: After heating the cookware of the Examples and Comparative Examples at 260 ° C. for 10 minutes and rapidly cooling to room temperature, the damage of the coating layer was checked and evaluated according to the following 4 criteria ((◎: damage occurred) Not, ○: A very small portion of the coating film is cracked or damaged, △: A portion of the coating film is cracked or damaged, X: Most of the coating film is cracked or damaged).

(8) Evaluation of cold resistance: After repeating 100 cycles by leaving the cookware of the above examples and comparative examples at -20 ° C for 2 hours and then leaving them at 60 ° C for 2 hours as one cycle, the coating layer was checked for damage. It was evaluated based on the following four criteria ((◎: no damage, ○: cracks or damage to a very small part of the coating film, △: cracking or damage to a part of the coating film, X: cracking or damage to most of the coating film) ).

2 shows a cookware manufactured according to Example 1. Referring to the results of FIG. 2 and Table 2, Examples 1 and 2 of the present invention had excellent dispersibility and mixing properties of the coating agent, and excellent physical properties such as appearance, corrosion resistance, adhesion, heat resistance and abrasion resistance, and the cooking While the top coating layer easily prevented discoloration of the color coating layer due to heat during heating of the appliance, in the case of Comparative Examples 1 to 7 applied outside the conditions of the present invention, the mixing and dispersibility of the coating agent were lowered compared to Examples 1 to 2. or, discoloration or cracks occurred on the exterior, and it was found that physical properties such as corrosion resistance, adhesion, heat resistance, and abrasion resistance were deteriorated.

So far, the present invention has been looked at mainly through embodiments. Those skilled in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

100: metal substrate 110: color coating layer
120: top coating layer

Claims (8)

Forming a color coating layer by applying a color coating agent having a primary color or mixed color to at least a portion of the surface of the metal substrate; and
Forming a top coating layer by applying a transparent top coating agent to the surface of the color coating layer to maintain the light and color of the color coating layer without change;
The cooking utensil manufacturing method,
forming a color coating layer by applying a color coating agent containing a first resin, a first pigment, and a first solvent to at least a portion of the surface of the metal substrate; and
Forming a top coating layer by applying a top coating agent containing a second resin and a second solvent to the surface of the color coating layer and performing heat treatment;
The first resin and the second resin are cookware manufacturing method, characterized in that each comprises dimethyl, methoxyphenylsiloxane of the phenylsilsesquioxane structure having a methoxy terminal.
delete The method of claim 1, wherein the heat treatment is performed at 220 to 330 °C.
The method of claim 1, wherein the color coating agent comprises 100 parts by weight of a first resin, 5 to 40 parts by weight of a first pigment, and 20 to 80 parts by weight of a first solvent,
Wherein the top coating agent comprises 100 parts by weight of the second resin and 20 to 70 parts by weight of the second solvent.
The method of claim 4, wherein the top coating agent is based on 100 parts by weight of the second resin,
Further comprising at least one of 1 to 30 parts by weight of a brightener and 5 to 25 parts by weight of a functional component,
The functional component is a cooking utensil manufacturing method characterized in that it comprises at least one of molybdenum oxide, phosphoric acid ester compound and alkoxy silane compound.
The method of claim 1, wherein the first solvent and the second solvent each contain at least one of an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent.
metal base;
a color coating layer formed on at least a portion of the surface of the metal substrate and having a primary color or mixed color; and
A transparent top coating layer formed on the surface of the color coating layer to maintain the color coating layer without light and color change;
The color coating layer is formed from a color coating agent containing a first resin, a first pigment, and a first solvent,
The top coating layer is formed from a top coating agent containing a second resin and a second solvent,
The first resin and the second resin are cookware, characterized in that each comprises dimethyl, methoxyphenylsiloxane of a phenylsilsesquioxane structure having a methoxy terminal.
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