CN114574011A

CN114574011A - Composite material for non-stick cookware, method for manufacturing same and non-stick cookware

Info

Publication number: CN114574011A
Application number: CN202210321976.3A
Authority: CN
Inventors: 瞿义生; 李超; 袁华庭; 张明
Original assignee: Wuhan Supor Cookware Co Ltd
Current assignee: Wuhan Supor Cookware Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-06-03
Anticipated expiration: 2042-03-29
Also published as: CN114574011B

Abstract

The invention provides a composite material for non-stick cookers, a manufacturing method thereof and the non-stick cookers. The composite material comprises a spraying material, silica sol and a fluorinated material, wherein the spraying material comprises at least one of metal powder and ceramic powder, the fluorinated material comprises at least one of graphite fluoride and graphene fluoride, the fluorine content of the graphite fluoride is more than 30%, and the volume ratio of the spraying material to the fluorinated material is 2: 1-6: 1. Therefore, the yield and the production efficiency of the non-stick cooker can be improved, and the performances of non-stick property, hardness, durability and the like of the non-stick cooker are improved.

Description

Composite material for non-stick cookware, method for manufacturing same and non-stick cookware

Technical Field

The present invention relates to a composite material for non-stick cookware and a method of manufacturing the same, and non-stick cookware, and more particularly, to a composite material for non-stick cookware comprising a spray material, a silica sol and a fluorinated material, a method of manufacturing the same, and non-stick cookware.

Background

Since the frying pan, the soup pan or the pan is the most important appliance for conditioning food and is closely related to the health of people and daily life, the pan with good quality is required to be heated evenly, dishes are not stuck to the pan when being fried, and simultaneously, the pan can be rust-proof, corrosion-resistant and can meet the requirements of users.

Non-stick cookware currently used for cooking food is mostly non-stick coated with a non-stick coating (e.g., a fluorine coating, a ceramic coating, etc.) on the surface of a metal substrate. However, the non-stick coating products used at present have the problems of short service life and the like, and are mainly reflected in the following aspects:

1. is easy to be scratched: due to the lower hardness of the non-stick coating, when hard food (such as shells and the like) is stir-fried, the surface of the non-stick coating of the non-stick cooker is easy to scratch, so that the service life of the non-stick cooker is shorter;

2. easy falling: because the metal base material is processed by the sand blasting process, the roughness of the metal base material is smaller, and after the non-stick cooker is used for a period of time, the problem that the bonding force between the non-stick coating and the metal base material is reduced due to long-term expansion and contraction and even falls off in the using process can occur.

In the existing non-stick coating, the fluorine coating has the defects of non-wear resistance, easy scratching and damage, no high temperature resistance and easy aging and discoloration, so that the non-stick cookware comprising the non-stick coating formed by the fluorine coating has the non-stick service life of not more than 1 year on average. In the dupont paint, although silicon carbide powder is added in order to enhance the wear resistance and non-stick life of the non-stick cookware, since silicon carbide itself does not have non-stick properties, the overall non-stick properties of the non-stick cookware are also reduced when the non-stick coating of the non-stick cookware is worn out to leak out the raised silicon carbide particles.

In addition, in the existing non-coating non-stick technology, although a treatment method of firstly thermally spraying metal powder or ceramic powder and then forming a non-stick surface through a post-treatment process is adopted to improve the non-stick life of the non-stick cooker and enhance the scratch resistance and wear resistance of the non-stick cooker, the initial non-stick grade of the non-stick cooker is not enough, and the non-stick requirement of the national standard fried egg cannot be met.

Disclosure of Invention

The present invention is conceived to solve the aforementioned technical problems in the related art. Therefore, the invention aims to provide a composite material for non-stick cookers, a manufacturing method thereof and the non-stick cookers, thereby improving the yield and production efficiency of the non-stick cookers.

According to one aspect of the present invention, there is provided a composite material for non-stick cookware, the composite material comprising a spray material, a silica sol and a fluorinated material, wherein the spray material comprises at least one of a metal powder and a ceramic powder, wherein the fluorinated material comprises at least one of graphite fluoride and graphene fluoride having a fluorine content of greater than 30%, and wherein the volume ratio of the spray material to the fluorinated material is from 2:1 to 6: 1. By including the spray material and the fluorinated material in a predetermined volume ratio, the composite material can achieve good non-tackiness.

In an embodiment of the present invention, the metal powder may include one or more of titanium, titanium alloy, iron, stainless steel, low carbon steel, high carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy, and the ceramic powder may include one or more of titanium oxide, titanium nitride, titanium carbide, triiron tetroxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide. By including predetermined metal powder and ceramic powder, the composite material can have high hardness, high stability, and good high temperature resistance, among other properties.

In embodiments of the invention, the volume ratio of fluorinated material to silica sol may be from about 1:5 to about 2: 5. By including a predetermined volume ratio of fluorinated material and silica sol, the non-stick properties of the non-stick coating can be improved.

In an embodiment of the present invention, the particle size of the composite material may be 20 to 100 μm, the particle size of the spray material may be 10 to 40 μm, and the particle size of the fluorinated material may be 5 to 20 μm. By controlling the particle size of the composite material, the spray coating material and the fluorinated material, the composite material can have the properties of high hardness, high stability, good initial non-adhesiveness and the like.

According to another aspect of the present invention there is provided a method of manufacturing a composite material for non-stick cookware, the method comprising the steps of: mixing the dispersion liquid of the fluorinated material with silica sol to obtain a dispersion liquid of fluorinated material sol; atomizing the fluorinated material sol dispersion; and mixing and granulating the atomized dispersion liquid and a spraying material at a predetermined temperature to obtain a composite material, wherein the spraying material comprises at least one of metal powder and ceramic powder, wherein the fluorinated material comprises at least one of graphite fluoride and graphene fluoride containing more than 30% of fluorine, and the volume ratio of the spraying material to the fluorinated material is 2:1 to 6: 1. The composite material prepared by the method can improve the utilization rate of the fluorinated material and the production efficiency.

In the examples of the present invention, the dispersion of the fluorinated material was obtained by mixing the fluorinated material with isopropyl alcohol. By dissolving the fluorinated material in a predetermined solvent, a dispersion of the fluorinated material with stable properties can be obtained.

In an embodiment of the invention, the volume ratio of the dispersion of fluorinated material to the silica sol is from 2:1 to 5: 1. By controlling the volume ratio of the dispersion liquid of the fluorinated material to the silica sol, the process stability can be improved, and the subsequent process treatment is facilitated.

In an embodiment of the invention, the method further comprises adjusting the pH of the fluorinated material sol dispersion to between 5 and 7 by means of metasilicic acid. By controlling the pH value of the fluorinated material sol dispersion, the process efficiency can be improved, and the process cost can be reduced.

In an embodiment of the present invention, the step of mixing and granulating the atomized dispersion and the spray material includes making a nozzle spraying the atomized dispersion and a nozzle spraying the spray material perpendicular to each other, wherein the predetermined temperature is 70 ℃ to 85 ℃. By controlling the technological parameters, the utilization rate of the fluorinated material can be further improved, the technological efficiency is improved, and the technological cost is reduced.

According to another aspect of the present invention, there is provided a non-stick cookware comprising: a substrate including an inner surface for carrying an article and an outer surface facing away from the inner surface; and a non-stick coating disposed on an inner surface of the substrate and comprising the composite material described above. The non-stick cooker has high hardness, high wear resistance, high heat resistance and improved initial non-stick performance, and can reach lasting non-stick effect and improve the yield and production efficiency of the non-stick cooker.

According to embodiments of the present invention, a composite material for non-stick cookware, a method of manufacturing the same, and non-stick cookware are provided. The non-stick cookware comprises a composite material comprising a spray material, a silica sol and a fluorinated material, thereby improving the yield and production efficiency of the non-stick cookware.

Drawings

The above and/or other features and aspects of the present invention will become apparent and appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view of a non-stick cookware according to an embodiment of the present invention.

FIG. 2 is a flow diagram of a method of manufacturing a composite material according to an embodiment of the invention.

Fig. 3 is a schematic view of a mixing manner in performing mixing granulation according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below. While exemplary embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Fluorinated materials such as graphite fluoride or graphene fluoride have received wide attention from the industry due to their excellent non-stick effect. However, since such a fluorinated material is very light, when it is sprayed with a spray material to prepare a non-stick cookware, such as granulation or coating, the spray material is likely to settle at the bottom and the fluorinated material powder floats on the upper layer due to the large specific gravity difference between the spray material and the fluorinated material, and thus, the yield and production efficiency of a general granulation or coating process are low.

Based on the above, the invention provides a composite material and a manufacturing method thereof, so as to further improve the yield and production efficiency of the non-stick cooker, thereby improving the performances of non-stick property, hardness, durability and the like of the non-stick cooker.

In the embodiment of the present invention, fluorinated material powder such as graphite fluoride or graphene fluoride is prepared into low-viscosity fluoride colloid by a sol-gel method, then the low-viscosity fluoride colloid is atomized by high-pressure spraying, and finally the atomized fluoride colloid and the spray material are mixed and granulated. The composite material formed by the granulation mode can improve the utilization rate of the fluorinated material, and can obtain good non-stickiness by utilizing the low surface energy of the fluorinated material, thereby effectively improving the non-stickiness performance of the non-stickiness cooker. Meanwhile, due to the high hardness of the spraying material, the problem that the fluorinated material powder is not wear-resistant can be effectively solved, so that the finally obtained non-stick coating has excellent initial non-stick and durable non-stick effects.

Among fluorinated materials, graphite fluoride, which is generated by direct reaction of carbon and fluorine, is an interlayer compound of graphite because graphite is a typical hexagonal system and has a layered structure, and thus has low surface free energy and good thermal and chemical stability. For example, graphite fluoride can have a long hydrophobic property in an aqueous solution of an acid and/or a base, and the contact angle of graphite fluoride with water can be 145 degrees (even higher than that of polytetrafluoroethylene) and thus is extremely difficult to wet. Meanwhile, the graphite fluoride has good high-temperature stability, and the temperature resistance of the graphite fluoride can reach 450 ℃ at most. Therefore, graphite fluoride having a low surface energy and a good hydrophobic effect may have excellent non-stick properties.

In addition, in addition to excellent low surface energy and non-stick properties, compared to graphite fluoride, graphene fluoride may also have very good toughness and thermal stability since it is a two-dimensional flaky graphite fluoride.

In embodiments of the invention, the composite material for the non-stick cookware may include spray material, silica sol, and fluorinated material. Specifically, the spray material may include at least one of a metal powder and a ceramic powder, the fluorinated material may include at least one of graphite fluoride and graphene fluoride having a fluorine content of greater than 30% and less than or equal to 61%, and a volume ratio of the spray material to the fluorinated material may be 2:1 to 6: 1. Here, the fluorine content refers to a mass percentage of fluorine atoms in the fluorinated material.

In an embodiment of the present invention, the metal powder included in the spray material may include one or more of titanium, titanium alloy, iron, stainless steel, low-carbon steel, high-carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy.

In an embodiment of the present invention, the ceramic powder included in the spray material may include one or more of titanium oxide, titanium nitride, titanium carbide, triiron tetroxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide.

In an embodiment of the present invention, the content of fluorine contained in the fluorinated material such as graphite fluoride or graphene fluoride may be more than 30%. Here, it is mainly considered that when the content of fluorine contained in the fluorinated material is less than 30%, the non-stick effect of the fluorinated material is insignificant.

In embodiments of the invention, the volume ratio between the spray material and the fluorinated material in the composite material may be 2:1 to 6: 1. Here, it is mainly considered that when the volume ratio between the spray material and the fluorinated material is less than 2:1, since the proportion of the fluorinated material included in the composite material is too large, problems such as a decrease in strength, poor wear resistance, and the like of the composite material may be caused; when the volume ratio between the spray material and the fluorinated material is greater than 6:1, the fluorinated material included in the composite material to perform the non-stick function is less, and thus the non-stick property of the finally formed composite material is poor.

In embodiments of the invention, the volume ratio between the spray material and the fluorinated material in the composite material may be 2:1 to 6: 1. For example, the volume ratio between the spray material and the fluorinated material may be 3:1 to 6:1, 3:1 to 5:1, 2:1 to 5:1, 3:1 to 4:1, 2:1 to 4:1, and the like. For example, the volume ratio between the spray material and the fluorinated material may be 2:1, 3:1, 4:1, 5:1, 6:1, and the like.

Specifically, in the composite material, the volume ratio between the spray material and the fluorinated material may be: the spray material is 20 to 30 parts, and the fluorinated material is 5 to 10 parts. For example, in the composite material, the spray material may be 20 parts and the fluorinated material may be 5 parts, the spray material may be 25 parts and the fluorinated material may be 5 parts, the spray material may be 30 parts and the fluorinated material may be 5 parts, the spray material may be 20 parts and the fluorinated material may be 10 parts, the spray material may be 25 parts and the fluorinated material may be 10 parts, the spray material may be 30 parts and the fluorinated material may be 10 parts, and the like.

In embodiments of the invention, the volume ratio of fluorinated material to silica sol may be from about 1:5 to about 2: 5. For example, the volume ratio of fluorinated material to silica sol can be about 1:5 to about 1.5:5, about 1:5 to about 1.8:5, about 1.2:5 to about 1.5:5, about 1.5:5 to about 1.9:5, about 1.5:5 to about 2:5, and the like. For example, the volume ratio of fluorinated material to silica sol can be about 1:5, about 1.2:5, about 1.5:5, about 1.9:5, about 2:5, and the like.

In an embodiment of the present invention, in the composite material, the particle size of the composite material may be 20 μm to 100 μm. Here, it is mainly considered that when the particle size of the composite material is smaller than 20 μm, the problems of blockage of the powder feeding pipe and the like in the spraying matching equipment used in the subsequent spraying process are easily caused, and the production is not smooth; when the particle size of the composite material is larger than 100 mu m, the granulated powder of the composite material has poor strength, low qualification rate and high cost, and is not beneficial to production control.

In an embodiment of the present invention, in the composite material, the particle size of the composite material may be 20 μm to 100 μm. For example, in the granulation process of the composite material, the particle size of the composite material may be 20 μm to 90 μm, 30 μm to 90 μm, 20 μm to 80 μm, 30 μm to 70 μm, 30 μm to 60 μm, 40 μm to 50 μm, or the like. Specifically, in the granulation process of the composite material, the particle size of the composite material may be 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or the like.

In the embodiment of the invention, the particle size of the spraying material in the composite material can be 10-40 μm, and mainly considering that when the particle size of the spraying material is less than 10 μm, the fine powder in the composite material formed by final granulation is more, the composite material powder which can really meet the process requirement is relatively less, and the overall qualified rate is low; when the particle size of the spraying material is larger than 40 μm, the particle size of the composite material formed by final granulation is relatively large, and thus, the power required in the subsequent spraying process is large, which easily causes problems such as increase of production cost.

In an embodiment of the present invention, the particle size of the spray material may be 10 μm to 40 μm in the composite material. For example, in the composite material, the particle size of the spray material may be 10 μm to 35 μm, 15 μm to 35 μm, 20 μm to 40 μm, 20 μm to 35 μm, 20 μm to 30 μm, 20 μm to 25 μm, 30 μm to 40 μm, 30 μm to 35 μm, or the like. For example, in the composite material, the particle size of the spray material may be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, or the like.

In embodiments of the invention, the particle size of the fluorinated material in the composite material may be 5 μm to 20 μm. Here, it is mainly considered that, when the particle diameter of the fluorinated material is less than 5 μm, the powder of the composite material formed by final granulation is too fine, the difficulty of the preparation process increases, and the cost becomes high; when the particle size of the fluorinated material is larger than 20 μm, the particles of the fluorinated material are large in the composite material formed by final granulation, which may cause problems such as a decrease in strength of the composite material.

In embodiments of the invention, the particle size of the fluorinated material in the composite material may be 5 μm to 20 μm. For example, in the composite, the particle size of the fluorinated material may be 5 μm to 18 μm, 5 μm to 15 μm, 6 μm to 20 μm, 8 μm to 20 μm, 10 μm to 15 μm, 12 μm to 20 μm, 12 μm to 18 μm, 12 μm to 15 μm. For example, in the composite material, the particle size of the fluorinated material may be 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, or the like.

Non-stick cookware comprising the above-described composite will be described in detail below with reference to FIG. 1.

FIG. 1 shows a schematic structural view of a non-stick cookware 100 according to one embodiment of the present invention.

As shown in FIG. 1, the non-stick cookware 100 includes a base 120 and a non-stick coating 140 on a surface of the base.

The base 120 may be the body of a non-stick cookware, for example, when the non-stick cookware is a pan, the base may be a pan body. The substrate 120 may be made of any suitable material commonly used in the art. The substrate 120 may include an inner surface for carrying the article and an outer surface facing away from the inner surface.

The non-stick coating 140 may be located on the inner surface of the substrate 120. The non-stick coating 140 may comprise a composite material as described above, such that the non-stick coating 140 may have improved initial non-stick properties.

It should be understood that the non-stick cookware 100 according to the present invention may also have a common cookware structure such as a cookware handle (e.g., pan handle), with only the body portion of the non-stick cookware illustratively shown in FIG. 1, and the other portions not shown.

The non-stick cookware according to the invention comprises the non-stick coating formed by the composite material, so that the non-stick cookware has improved initial non-stick property, high hardness and high stability, and the yield and the production efficiency of the non-stick cookware are improved.

In the embodiment of the present invention, the above composite material can be manufactured by mixing-atomizing-mixing granulation.

A method of manufacturing a composite material according to an embodiment of the present invention will be described below in detail with reference to fig. 2 and 3.

FIG. 2 is a flow diagram of a method of manufacturing a composite material according to an embodiment of the invention. Fig. 3 is a schematic view of a mixing manner in performing mixing granulation according to an embodiment of the present invention.

Referring to fig. 2, a method of manufacturing a composite material according to an embodiment of the present invention includes mixing (step S310), atomization (step S320), and mixing granulation (step S330).

In step S310, a mixing step is performed. Specifically, a fluorinated material such as graphite fluoride and/or graphene fluoride is first mixed with isopropyl alcohol to obtain a dispersion liquid of the fluorinated material. Then, the resulting dispersion of the fluorinated material is sufficiently mixed with a silica sol to form a fluorinated material sol dispersion. Wherein the volume ratio of the dispersion of the fluorinated material to the silica sol may be 2:1 to 5: 1. Here, it is mainly considered that when the volume ratio of the dispersion of the fluorinated material to the silica sol is within this range, the dispersion of the fluorinated material sol can have a more suitable viscosity. For example, the volume ratio of the dispersion of fluorinated material to silica sol can be 2:1 to 4:1, 2:1 to 3:1, 3:1 to 5:1, 3:1 to 4:1, and the like. For example, the volume ratio of the dispersion of the fluorinated material to the silica sol may be 2:1, 3:1, 4:1, 5:1, or the like.

In addition, in the process of preparing the fluorinated material sol dispersion, the pH of the fluorinated material sol dispersion may be adjusted to be maintained between 5 and 7 by adding metasilicic acid. Here, it is mainly considered that when the pH of the fluorinated material sol dispersion is within this range, the fluorinated material sol dispersion may have better stability and may slow down the progress of the gel reaction.

In step S320, an atomization step is performed. Specifically, the fluorinated material sol dispersion liquid obtained in step S310 is atomized by compressed air.

In step S330, a mixing granulation step is performed. The atomized dispersion liquid obtained in step S320 is mixed with a spray material and granulated to obtain a composite material. As shown in fig. 3, the mixing manner in the mixing granulation step may be 90-degree opposite spraying. Specifically, the nozzle spraying the atomized dispersion may be placed horizontally and the nozzle spraying the spray material may be placed vertically upward (i.e., the nozzle spraying the atomized dispersion and the nozzle spraying the spray material are perpendicular to each other) so that the two are uniformly mixed together in the air. In the mixing and granulating step, the ambient temperature may be controlled to be 70 ℃ to 85 ℃ so that the pH value of the particle interface after the atomized dispersion liquid is mixed with the spray material is changed. Here, it is mainly considered that when the ambient temperature in the mixing granulation step is within this temperature interval, a gel reaction may occur to firmly bond the fluorinated material and the spray material together, eventually forming a composite material.

Further, step S320 and step S330 may be performed simultaneously.

According to the embodiment of the invention, in the final composite material, as the composite material comprises the spray coating material, the silica sol and the fluorinated material, the non-stick coating formed by the composite material has the characteristics of stable material quality, high hardness, high temperature resistance, long non-stick service life and the like. Meanwhile, the process method for forming the composite material can effectively avoid the problem of sedimentation caused by large specific gravity difference between the fluorinated material and the spraying material, thereby improving the yield and the production efficiency of the composite material and the non-stick cooker.

The composite material and the method for producing the composite material of the present invention will be described in detail below with reference to examples and comparative examples.

Example 1

Graphite fluoride (fluorine content 50%) as a fluorinated material was mixed with isopropyl alcohol at a volume ratio of 1:10 to obtain an isopropyl alcohol dispersion of graphite fluoride.

An isopropyl alcohol dispersion of graphite fluoride in a volume ratio of 2:1 was sufficiently mixed with a silica sol to form a sol dispersion of graphite fluoride. Wherein, the pH value is adjusted by adding metasilicic acid into the sol dispersion liquid of the graphite fluoride, so that the pH value is kept at 5.

Then, the sol dispersion of graphite fluoride was atomized by compressed air. Meanwhile, a nozzle spraying the atomized dispersion was placed horizontally, and a nozzle spraying titanium as a spray material was vertically upward so as to be perpendicular to each other, and 90-degree opposite spraying was performed at an ambient temperature of 70 ℃ to prepare a composite material, in which the volume ratio of the spray material to the fluorinated material was 2: 1.

The composite material is sprayed on the surface of the pan body through a thermal spraying process to form a non-stick coating with the thickness of 70 mu m.

Example 2

The difference from example 1 is that the volume ratio of the isopropyl alcohol dispersion of graphite fluoride to the silica sol was 3: 1.

Example 3

The difference from example 1 is that the volume ratio of the isopropyl alcohol dispersion of graphite fluoride to the silica sol was 5: 1.

Example 4

The difference from example 1 is that graphite fluoride was replaced with graphene fluoride, and the volume ratio of the isopropyl alcohol dispersion of graphene fluoride to the silica sol was 3: 1.

Example 5

The difference from example 1 is that the pH of the sol dispersion of graphite fluoride was 7.

Example 6

The difference from example 1 is that the ambient temperature of the atomization spray during the preparation of the composite was 80 ℃.

Example 7

The difference from example 1 is that the volume ratio of spray material to fluorinated material is 6: 1.

Comparative example 1

The difference from example 1 is that the volume ratio of the isopropyl alcohol dispersion of graphite fluoride to the silica sol was 1: 1.

Comparative example 2

The difference from example 1 is that pH was not adjusted with metasilicic acid in the sol dispersion of graphite fluoride, and that the sol dispersion of graphite fluoride had pH 8.

Comparative example 3

The difference from example 1 is that the ambient temperature of the atomization spray during the preparation of the composite was 40 ℃.

Comparative example 4

The difference from example 1 is that the ambient temperature of the atomization spray during the preparation of the composite was 100 ℃.

Scheme(s)	Feasibility of the process	Particle size of composite material
			Example 1	Feasible	35-100 μm, uniform particle size
Example 2	Is feasible	20-100 μm, uniform particle size
			Example 3	Is feasible	50-100 μm, uniform particle size
Example 4	Feasible	25-90 μm, uniform particle size
			Example 5	Feasible	25-100 μm, uniform particle size
Example 6	Feasible	25-75 μm, uniform particle size
			Example 7	Feasible	25 mu m-100um, uniform granularity
Comparative example 1	Feasible	50-150 μm, large particle size
			Comparative example 2	It is not feasible that the sol dispersion precipitates	---
Comparative example 3	Is not feasible, and agglomeration occurs in the atomization process	---
			Comparative example 4	Impracticable, excessive porosity of the composite powder	---

As can be seen from the data in table 1, comparative example 1 has a large particle size of the composite material thus prepared, although it has process feasibility, while comparative examples 2 to 4 have no process feasibility. Therefore, compared with comparative examples 1 to 4, the composite materials prepared according to examples 1 to 7 of the present invention have good process feasibility and uniform particle size, and can improve the yield and production efficiency of the non-stick cookware, thereby improving the non-stick property, hardness, durability, etc. of the non-stick cookware.

In summary, according to the embodiment of the present invention, since the composite material for the non-stick coating may include the spray material, the silica sol, and the fluorinated material, the non-stick property and the non-stick durability of the non-stick coating may be improved, and the effects of stable material, long non-stick life, and the like may be achieved. Meanwhile, the composite material is formed by the granulation method according to the embodiment of the invention, so that the yield and the production efficiency of the composite material and the non-stick cooker can be improved.

The invention manufactures the non-stick coating with optimized performance by reasonably optimizing the components of the composite material for the non-stick coating and the production method thereof. The non-stick cooker manufactured by using the composite material realizes multiple performances such as stable material quality, durable non-stick performance and the like, thereby greatly improving the user experience.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. The embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

Claims

1. A composite material for non-stick cookware, the composite material comprising a spray material, a silica sol and a fluorinated material,

wherein the spray material includes at least one of a metal powder and a ceramic powder,

wherein the fluorinated material comprises at least one of graphite fluoride and graphene fluoride containing fluorine of more than 30%, and

wherein the volume ratio of the spray coating material to the fluorinated material is 2:1 to 6: 1.

2. The composite of claim 1, wherein the metal powder comprises one or more of titanium, titanium alloy, iron, stainless steel, low carbon steel, high carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy, and

wherein the ceramic powder comprises one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, ferric oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide.

3. The composite material of claim 2, wherein the volume ratio of the fluorinated material to the silica sol is from 1:5 to 2: 5.

4. The composite material of claim 1, wherein the particle size of the composite material is 20 to 100 μ ι η, the particle size of the spray material is 10 to 40 μ ι η, and the particle size of the fluorinated material is 5 to 20 μ ι η.

5. A method of making a composite material for non-stick cookware, the method comprising the steps of:

mixing the dispersion liquid of the fluorinated material with silica sol to obtain a dispersion liquid of fluorinated material sol;

atomizing the fluorinated material sol dispersion; and

mixing and granulating the atomized dispersion liquid and the spraying material at a preset temperature to obtain a composite material,

6. The method of claim 5, wherein the dispersion of fluorinated material is obtained by mixing the fluorinated material with isopropanol.

7. The method of claim 5, wherein the volume ratio of the dispersion of fluorinated material to the silica sol is from 2:1 to 5: 1.

8. The method of claim 5, further comprising adjusting the pH of the fluorinated material sol dispersion to between 5 and 7 with metasilicic acid.

9. The method according to claim 5, wherein the step of mixing and granulating the atomized dispersion and the spray material comprises making a nozzle spraying the atomized dispersion and a nozzle spraying the spray material perpendicular to each other, wherein the predetermined temperature is 70 ℃ to 85 ℃.

10. A non-stick cookware, comprising:

a substrate comprising an inner surface for carrying an article and an outer surface facing away from the inner surface; and

a non-stick coating disposed on said inner surface of said substrate and comprising a composite material according to any one of claims 1 to 4.