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

Abstract

The present invention provides a composite material for non-stick cookware, a non-stick cookware, and a manufacturing method thereof. The composite material, based on the total weight of the composite material, comprises: 50 wt% to 80 wt% of a perovskite material and 20 wt% to 50 wt% of a ductile metal material, wherein the perovskite material is represented by ABO3, A comprises at least one of alkaline earth metals, B comprises at least one of transition metals, and wherein the elongation at break of the ductile metal material is greater than or equal to 12%. Therefore, the non-stick cookware including a non-stick coating containing the composite material achieves effects such as stable material, high hardness, high temperature resistance, and long non-stick life.

Description

Technical Field

[0001] The present invention relates to a composite material for non-stick cookware, non-stick cookware and a method for manufacturing the same, and more particularly to a composite material comprising a perovskite material and a ductile metal material, non-stick cookware and a method for manufacturing the same. Background Art

[0002] Currently, non-stick cookware used for cooking food mainly achieves non-stick effect by spraying a layer of fluororesin as a non-stick coating on the surface of the metal substrate. However, non-stick cookware made of fluororesin currently has problems such as short non-stick life, which are mainly reflected in the following aspects:

[0003] 1. Easy to be worn and scratched: Fluororesin polymer materials generally have the characteristics of low hardness and poor wear resistance. When using non-stick cookware made of fluororesin to stir-fry hard food (such as shells, bones, etc.) or using a metal spatula to stir-fry food, the non-stick coating of the non-stick cookware is easily scratched and fuzzed, which in turn causes the non-stick property of the non-stick cookware to fail.

[0004] 2. Not resistant to high temperature aging: When the fluororesin coating is used for a long time at a high temperature of more than 260°C, it is prone to aging, yellowing and other problems. However, when cooking with non-stick cookware in daily life, dry burning is inevitable, which will lead to problems such as short life of the fluororesin non-stick coating.

[0005] Therefore, it is necessary to develop new non-stick coating materials to solve the problems of non-stick cookware's lack of wear resistance, scratch resistance and short lifespan. Summary of the invention

[0006] The present invention aims to solve the above technical problems in the related art. To this end, the purpose of the present invention is to provide a composite material for non-stick cookware, non-stick cookware and a manufacturing method thereof, so as to realize non-stick cookware with excellent characteristics such as wear resistance, scratch resistance and long life.

[0007] According to one aspect of the present invention, a composite material for non-stick cookware is provided, wherein the composite material comprises, based on the total weight of the composite material, 50wt% to 80wt% of a perovskite material and 20wt% to 50wt% of a ductile metal material, wherein the perovskite material is composed of ABO 3 Indicates that A includes at least one of alkaline earth metals, B includes at least one of transition metals, wherein the elongation at break of the ductile metal material is greater than or equal to 12%. By including a predetermined weight of the perovskite material and the ductile metal material, the composite material can have high hardness and high stability, thereby achieving good non-stickiness.

[0008] In an embodiment of the present invention, A can be Ca and B can be Ti. By including a predetermined perovskite material, the composite material can have properties such as high hardness, high stability, and good high-temperature resistance.

[0009] In an embodiment of the present invention, the ductile metal material can include Fe, Al, Cu, Ni, or an alloy thereof. By using a predetermined ductile metal material, the hardness of the composite material can be improved.

[0010] In an embodiment of the present invention, the average particle size of both the perovskite material and the ductile metal material can be 10 μm to 100 μm. By controlling the particle sizes of the perovskite material and the ductile metal material, the composite material can have properties such as high hardness and high stability.

[0011] According to another aspect of the present invention, there is provided a non-stick cooking utensil, which includes: a substrate including an inner surface for carrying an article and an outer surface opposite to the inner surface; and a non-stick coating provided on the inner surface of the substrate and including the above composite material. The non-stick cooking utensil can have characteristics such as high hardness, high wear resistance, and long life, achieving a lasting non-stick use effect.

[0012] In an embodiment of the present invention, the thickness of the non-stick coating can be 20 μm to 100 μm. By controlling the thickness of the non-stick coating, the non-stick cooking utensil can have properties such as high hardness and high stability.

[0013] According to another aspect of the present invention, there is provided a method for manufacturing a non-stick cooking utensil, the method including the following steps: preparing the above composite material; and spraying the composite material on the substrate of the non-stick cooking utensil by plasma spraying to form a non-stick coating. The non-stick cooking utensil obtained by this method using the above composite material has high stability, high hardness, and improved life.

[0014] In an embodiment of the present invention, plasma spraying can be performed under the following conditions: the flow rate of the main gas supply is 1500 L / H to 2000 L / H, the flow rate of the hydrogen supply is 80 L / H to 120 L / H, the voltage is 40 V to 60 V, the current is 450 A to 550 A, and the rate of feeding the composite material is 30 g / min to 70 g / min. By controlling the conditions of plasma spraying, the process efficiency can be improved and the process cost can be reduced.

[0015] In an embodiment of the present invention, the diameter of the nozzle used for plasma spraying can be 3 mm to 7 mm and the distance between the nozzle and the substrate of the non-stick cooking utensil can be 80 mm to 130 mm. By controlling the conditions of plasma spraying, the process efficiency can be improved and the process cost can be reduced.

[0016] In an embodiment of the present invention, the method may further include sanding the non-stick coating. By reasonably selecting the process steps for preparing the non-stick cookware, the process efficiency can be improved and the process cost can be reduced.

[0017] According to an embodiment of the present invention, there is provided a composite material for a non-stick cookware, a non-stick cookware, and a manufacturing method thereof. The non-stick cookware includes a composite material comprising a perovskite material and a ductile metal material, thereby having properties such as high hardness, high wear resistance, high heat resistance, and improved lifespan, achieving a non-stick effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By combining the description of the embodiments with the drawings, the above and / or other features and aspects of the present invention will become clear and easy to understand.

[0019] Figure 1 is a schematic diagram of a non-stick cookware according to an embodiment of the present invention.

[0020] Figure 2 is a flowchart of a method for manufacturing a non-stick cookware according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Hereinafter, exemplary embodiments of the present invention will be described in more detail. Although the exemplary embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0022] As described above, the non-stick coatings included in the prior art non-stick cookware more or less have certain functional defects. Therefore, the present invention proposes a composite material for a non-stick coating with more optimized performance.

[0023] In an embodiment of the present invention, in order to solve the problems such as low hardness, poor wear resistance, and poor scratch resistance of fluororesins in the field of composite materials for non-stick cookware, a composite material comprising a perovskite material and a ductile metal material is innovatively used to prepare a non-stick cookware, thereby improving the non-stick effect, wear resistance, and scratch resistance of the non-stick cookware while improving the toughness of the composite material.

[0024] In an embodiment of the present invention, the composite material for a non-stick cookware may include a perovskite material and a ductile metal material. Specifically, the composite material for a non-stick cookware may include 50 wt% to 80 wt% of the perovskite material and 20 wt% to 50 wt% of the ductile metal material based on the total weight of the composite material.

[0025] In an embodiment of the present invention, the perovskite material may be composed of ABO 3It is shown that A can include at least one of alkaline earth metals, and B can include at least one of transition metals. In an embodiment, A is Ca and B is Ti. The perovskite material (specifically, calcium titanate ceramic material) has special properties. Specifically, the perovskite material can have a typical ABX 3 crystal structure. As a representative of perovskite materials, calcium titanate can have a large number of oxygen vacancies and crystal defects in its 113 structure. In the ABX 3 crystal structure of the perovskite material, the A site can be a Ca metal cation, and the B site can be a Ti metal cation. When heated, the metal cations at the A site and the B site will displace, resulting in lattice distortion, reducing the symmetry and order of the crystal structure, and reducing the surface energy, thus showing a certain non-stick effect. Specifically, as the most typical representative among perovskite materials, calcium titanate is currently commonly used in the photovoltaic industry and has excellent photoelectric conversion efficiency. Calcium titanate belongs to the cubic crystal system. Since the calcium titanate crystal is extremely easy to cause lattice distortion through TiO 6 rotation or cation displacement, thus reducing the symmetry of the crystal structure, calcium titanate often undergoes a phase change between the cubic, tetragonal, and orthorhombic crystal systems. During the lattice distortion of calcium titanate, the order of the material crystal structure decreases, and the surface free energy decreases. Therefore, calcium titanate can show a certain non-stick property, and the magnitude of the non-stick property can be related to the degree of lattice distortion of calcium titanate. Therefore, the perovskite material can be used as a composite material for non-stick cookware. Mixing the perovskite material with a ductile metal material to prepare a composite material can further make up for the problem of insufficient toughness of the perovskite material, thereby further increasing the non-stick property of the composite material.

[0026] In an embodiment of the present invention, based on the total weight of the composite material, the weight of the perovskite material can be 50 wt% to 80 wt%. Here, it is mainly considered that when the weight of the perovskite material is less than 50 wt%, the non-stick effect of the non-stick coating prepared from the composite material including the perovskite material is not obvious; when the weight of the perovskite material is higher than 80 wt%, the non-stick coating prepared from the composite material including the perovskite material is too brittle, and problems such as the peeling off of the non-stick coating caused by the accumulation of thermal stress are likely to occur during the spraying process. Specifically, in an embodiment of the present invention, based on the total weight of the composite material, the weight of the perovskite material can be 50 wt% to 75 wt%, 55 wt% to 80 wt%, 60 wt% to 80 wt%, 70 wt% to 80 wt%, 60 wt% to 75 wt%, 62 wt% to 75 wt%, 65 wt% to 75 wt%, 65 wt% to 78 wt%, 70 wt% to 75 wt%, etc. Specifically, based on the total weight of the composite material, the weight of the perovskite material can be 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, 55 wt%, 56 wt%, 57 wt%, 58 wt%, 59 wt%, 60 wt%, 61 wt%, 62 wt%, 63 wt%, 64 wt%, 65 wt%, 66 wt%, 67 wt%, 68 wt%, 69 wt%, 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt%, 80 wt%, etc.

[0027] In an embodiment of the present invention, based on the total weight of the composite material, the weight of the ductile metal material may be 20 wt% to 50 wt%. Here, it is mainly considered that when the weight of the ductile metal material is lower than 20 wt%, the non-stick coating prepared from the composite material including the ductile metal material is too brittle; when the weight of the ductile metal material is higher than 50 wt%, the non-stick effect of the non-stick coating prepared from the composite material including the ductile metal material is not obvious. Specifically, in an embodiment of the present invention, based on the total weight of the composite material, the weight of the ductile metal material may be 20 wt% to 45 wt%, 25 wt% to 50 wt%, 30 wt% to 50 wt%, 40 wt% to 50 wt%, 30 wt% to 45 wt%, 32 wt% to 45 wt%, 35 wt% to 45 wt%, 35 wt% to 48 wt%, 40 wt% to 45 wt%, etc. Specifically, based on the total weight of the composite material, the weight of the ductile metal material may be 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, 49 wt%, 50 wt%, etc.

[0028] In an embodiment of the present invention, the elongation at break of the ductile metal material can be greater than or equal to about 12% and less than or equal to about 20%. For example, the elongation at break of the ductile metal material can be greater than or equal to about 13% and less than or equal to about 20%, greater than or equal to about 14% and less than or equal to about 20%, greater than or equal to about 15% and less than or equal to about 20%, greater than or equal to about 16% and less than or equal to about 20%, greater than or equal to about 17% and less than or equal to about 20%, greater than or equal to about 18% and less than or equal to about 20%, greater than or equal to about 19% and less than or equal to about 20%, greater than or equal to about 13% and less than or equal to about 19%, greater than or equal to about 14% and less than or equal to about 19%, greater than or equal to about 15% and less than or equal to about 19%, greater than or equal to about 16% and less than or equal to about 19%, greater than or equal to about 17% and less than or equal to about 19%, greater than or equal to about 18% and less than or equal to about 19%, greater than or equal to about 13% and less than or equal to about 18%, greater than or equal to about 14% and less than or equal to about 18%, greater than or equal to about 15% and less than or equal to about 18%, greater than or equal to about 16% and less than or equal to about 18%, greater than or equal to about 17% and less than or equal to about 18%, greater than or equal to about 13% and less than or equal to about 17%, greater than or equal to about 14% and less than or equal to about 17%, greater than or equal to about 15% and less than or equal to about 17%, greater than or equal to about 16% and less than or equal to about 17%, greater than or equal to about 13% and less than or equal to about 16%, greater than or equal to about 14% and less than or equal to about 16%, greater than or equal to about 15% and less than or equal to about 16%, greater than or equal to about 13% and less than or equal to about 15%, greater than or equal to about 14% and less than or equal to about 15%, greater than or equal to about 13% and less than or equal to about 14%, etc. Specifically, the elongation at break of the ductile metal material can be 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0029] In an embodiment of the present invention, the ductile metal material can include Fe, Al, Cu, Ni, or an alloy thereof.

[0030] In an embodiment of the present invention, the average particle size of the perovskite material can be from 10 μm to 100 μm. Specifically, the average particle size of the perovskite material can be from 10 μm to 90 μm, from 10 μm to 80 μm, from 10 μm to 70 μm, from 10 μm to 60 μm, from 10 μm to 50 μm, from 10 μm to 40 μm, from 10 μm to 30 μm, from 10 μm to 20 μm, from 20 μm to 90 μm, from 20 μm to 80 μm, from 20 μm to 70 μm, from 20 μm to 60 μm, from 20 μm to 50 μm, from 20 μm to 40 μm, from 20 μm to 30 μm, from 30 μm to 90 μm, from 30 μm to 80 μm, from 30 μm to 70 μm, from 30 μm to 60 μm, from 30 μm to 50 μm, from 30 μm to 40 μm, from 40 μm to 90 μm, from 40 μm to 80 μm, from 40 μm to 70 μm, from 40 μm to 60 μm, from 40 μm to 50 μm, from 50 μm to 90 μm, from 50 μm to 80 μm, from 50 μm to 70 μm, from 50 μm to 60 μm, from 60 μm to 90 μm, from 60 μm to 80 μm, from 60 μm to 70 μm, from 70 μm to 90 μm, from 70 μm to 80 μm, from 80 μm to 90 μm, etc. Specifically, the average particle size of the perovskite material can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, etc.

[0031] In an embodiment of the present invention, the average particle size of the ductile metal material can be from 10 μm to 100 μm. Specifically, the average particle size of the ductile metal material can be from 10 μm to 90 μm, from 10 μm to 80 μm, from 10 μm to 70 μm, from 10 μm to 60 μm, from 10 μm to 50 μm, from 10 μm to 40 μm, from 10 μm to 30 μm, from 10 μm to 20 μm, from 20 μm to 90 μm, from 20 μm to 80 μm, from 20 μm to 70 μm, from 20 μm to 60 μm, from 20 μm to 50 μm, from 20 μm to 40 μm, from 20 μm to 30 μm, from 30 μm to 90 μm, from 30 μm to 80 μm, from 30 μm to 70 μm, from 30 μm to 60 μm, from 30 μm to 50 μm, from 30 μm to 40 μm, from 40 μm to 90 μm, from 40 μm to 80 μm, from 40 μm to 70 μm, from 40 μm to 60 μm, from 40 μm to 50 μm, from 50 μm to 90 μm, from 50 μm to 80 μm, from 50 μm to 70 μm, from 50 μm to 60 μm, from 60 μm to 90 μm, from 60 μm to 80 μm, from 60 μm to 70 μm, from 70 μm to 90 μm, from 70 μm to 80 μm, from 80 μm to 90 μm, etc. Specifically, the average particle size of the ductile metal material can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, etc.

[0032] In an embodiment of the present invention, the thickness of the non-stick coating finally formed may be 20 μm to 100 μm. Specifically, the thickness of the non-stick coating finally formed may be 20 μm to 90 μm, 20 μm to 80 μm, 20 μm to 70 μm, 20 μm to 60 μm, 20 μm to 50 μm, 20 μm to 40 μm, 20 μm to 30 μm, 30 μm to 90 μm, 30 μm to 80 μm, 30 μm to 70 μm, 30 μm to 60 μm, 30 μm to 50 μm, 30 μm to 40 μm, 4 ... 0μm to 90μm, 40μm to 80μm, 40μm to 70μm, 40μm to 60μm, 40μm to 50μm, 50μm to 90μm, 50μm to 80μm, 50μm to 70μm, 50μm to 60μm, 60μm to 90μm, 60μm to 80μm, 60μm to 70μm, 70μm to 90μm, 70μm to 80μm, 80μm to 90μm, etc. Specifically, the thickness of the non-stick coating finally formed can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc.

[0033] The following will be combined Figure 1 The non-stick cookware including the composite material will be described in detail.

[0034] Figure 1 A schematic structural diagram of a non-stick cooker 100 according to an embodiment of the present invention is shown.

[0035] like Figure 1 As shown in FIG. 1 , the non-stick cookware 100 includes a substrate 120 and a non-stick coating 140 located on the surface of the substrate.

[0036] The substrate 120 may be the main body of the non-stick cookware, for example, when the non-stick cookware is a pot, the substrate may be a pot 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 items and an outer surface facing away from the inner surface.

[0037] The non-stick coating 140 may be located on the inner surface of the substrate 120. The non-stick coating 140 may include the composite material described above, so that the non-stick coating 140 may have improved hardness, wear resistance, scratch resistance, and lifespan.

[0038] 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., a pot handle). Figure 1 Only the main body of the non-stick cookware is exemplarily shown in the figure, and other parts are not shown.

[0039] The non-stick cookware according to the present invention includes a non-stick coating formed by a composite material, so that the non-stick cookware has high hardness, high stability, and improved lifespan.

[0040] The following will be described in detail with reference to Figure 2 a method for manufacturing a non-stick cookware according to an embodiment of the present invention.

[0041] Figure 2 is a flowchart of a method for manufacturing a non-stick cookware according to an embodiment of the present invention.

[0042] Referring to Figure 2 , a method for manufacturing a non-stick cookware according to an embodiment of the present invention includes preparing a composite material (step S310); spraying the composite material on a substrate of the non-stick cookware by plasma spraying (step S320); and sanding the non-stick coating (step S330).

[0043] In step S310, first, the steps of grinding a perovskite material and a ductile metal material are performed. The perovskite material and the ductile metal material are ground to obtain perovskite material powder with an average particle size of 10 μm to 100 μm and ductile metal powder with an average particle size of 10 μm to 100 μm. The grinding method can adopt any existing technology, and the present invention places no restrictions thereon. Optionally, perovskite material powder with an average particle size of 10 μm to 100 μm and ductile metal powder with an average particle size of 10 μm to 100 μm can be directly purchased commercially. Then, the perovskite material powder and the ductile metal powder are uniformly mixed in a mass ratio of 4:1 to 1:1 to obtain a composite material.

[0044] In step S320, a spraying step is performed. Specifically, first, the composite material is preheated to improve the fluidity of the composite material powder and prevent problems such as gun jamming during the spraying step. Then, the preheated composite material is sprayed on the substrate of the non-stick cookware by a plasma spraying process to form a non-stick coating. In the plasma spraying step, the plasma spraying can be performed according to the following parameters: the flow rate of the main gas (specifically, argon) supplied is 1500 L / H to 2000 L / H; the flow rate of hydrogen supplied is 80 L / H to 120 L / H; the voltage is 40 V to 60 V; the current is 450 A to 550 A; the rate of feeding the composite material is 30 g / min to 70 g / min; the straight hole of the straight hole nozzle is 3 mm to 7 mm (preferably, 5 mm); and the distance between the nozzle and the substrate of the non-stick cookware is 80 mm to 130 mm. Through the above steps, a non-stick cookware with a non-stick coating having a thickness of 20 μm to 100 μm can be prepared.

[0045] In step S330, a sanding process is performed. The method of the sanding process can adopt any existing technology, and the present invention does not limit this.

[0046] By coating the composite material of the present invention on the surface of a non-stick cookware, the finally formed non-stick cookware can have improved non-stick properties, achieving effects such as stable material, high hardness, high temperature resistance, and long non-stick life.

[0047] Hereinafter, the composite material of the present invention and the method for manufacturing a non-stick cookware will be described in detail with reference to examples and comparative examples.

[0048] Example 1

[0049] A composite material for a non-stick cookware is prepared using a perovskite material and a ductile metal material. Specifically, calcium titanate material powder with an average particle size of 20 μm and FeTi 30 alloy powder with an average particle size of 20 μm are uniformly mixed in a mass ratio of 4:1 to obtain a composite material. Then, the composite material is preheated and plasma sprayed after the preheating.

[0050] In the step of preparing the blank of the non-stick cookware, an aluminum alloy blank is used as the spraying substrate, and a sandblasting treatment is used for the substrate treatment. Among them, brown fused alumina with 40 to 60 meshes is used to sandblast the blank so that the blank has a roughness (Rz) of 30 μm to 50 μm.

[0051] In the plasma spraying process, the specific parameters are as follows: the flow rate of supplied argon is 1500 L / H; the flow rate of supplied hydrogen is 100 L / H; the voltage is 50 V; the current is 500 A; the feeding rate of the composite material is 30 g / min; the diameter of the straight-hole nozzle is 5 mm; and the distance between the spray gun and the blank is 80 mm.

[0052] The average thickness of the finally formed non-stick coating is 50 μm.

[0053] After the plasma spraying is completed, the formed non-stick coating is sanded to obtain a non-stick cookware with a smooth inner surface.

[0054] Example 2

[0055] The difference from Example 1 is that Calcium titanate material powder and FeTi 30 The mass ratio of the alloy powder is 2:1.

[0056] Example 3

[0057] The difference from Example 1 is that Calcium titanate material powder and FeTi 30 The mass ratio of the alloy powder is 1:1.

[0058] Comparative Example 1

[0059] A composite material for non-stick cookware is prepared using a fluororesin. Specifically, polytetrafluoroethylene is used as the coating material, and the non-stick cookware is prepared by air spraying and sintering curing. Among them, the composition of polytetrafluoroethylene is 45wt% polytetrafluoroethylene resin, 35wt% water, 5wt% diethylene glycol monoethyl ether, 5wt% glycerol, and 10wt% polyoxyethylene glycol alkyl ether.

[0060] In the air spraying process, the specific parameters are as follows: the spraying distance is 160mm; the air pressure is 0.3MPa; the flow rate is 8L / min.

[0061] In the sintering curing process, the specific parameters are as follows: the sintering temperature is 420°C and the heat preservation time is 6min.

[0062] The average thickness of the non-stick coating finally formed by the above steps is 20μm.

[0063] Comparative Example 2

[0064] A composite material for non-stick cookware is prepared using a non-stick ceramic material. Specifically, non-stick ceramic is used as the coating material, and the non-stick cookware is prepared by air spraying and sintering curing. Among them, the composition of non-stick ceramic is 45wt% polydimethylsiloxane, 25wt% silica sol, 10wt% butyl acetate, 5wt% ethanol, and 15wt% deionized water.

[0065] In the air spraying process, the specific parameters are as follows: the spraying distance is 160mm; the air pressure is 0.3MPa; the flow rate is 10L / min.

[0066] In the sintering curing process, the specific parameters are as follows: the sintering temperature is 270°C and the heat preservation time is 4min.

[0067] The average thickness of the non-stick coating finally formed by the above steps is 20μm.

[0068] Testing of the performance of non-stick cookware

[0069] Accelerated simulation testing and persistent non-stickiness testing are used to test the non-stick effects of the non-stick coatings of the non-stick cookware prepared in Examples 1 to 3 and Comparative Examples 1 and 2. Specifically, the testing method is as follows:

[0070] (1) Testing of accelerated simulation (non-stick life)

[0071] Referring to the accelerated simulation test procedure for non-stick frying pans, the non-stick lives of the non-stick cookware prepared in Examples 1 to 3 and Comparative Examples 1 and 2 are evaluated. The testing process is as follows:

[0072] The non-stick cookware prepared in Examples 1 to 3 and Comparative Examples 1 and 2 was successively subjected to vibration abrasion resistance test, dry burning of mixed sauce test, boiling of brine test, frying of quartz stone (iron spatula) test, and fried egg evaluation of non-stick grade test. When all the above test steps were completed, it marked the end of a test cycle.

[0073] In the vibration abrasion resistance test , and the specific parameters are as follows:

[0074] Instrument: Vibration abrasion resistance tester.

[0075] Test method: 1) Put 1 Kg of quartz stone (particle size 9 mm to 12 mm) into the non-stick cookware; 2) Place the non-stick cookware on the heating furnace; 3) Set the vibration time of the instrument to 15 minutes, the heating temperature to 150 °C to 180 °C, and the rotation speed to 300 revolutions per minute; 4) Turn on the vibration button to make the quartz stone vibrate in the non-stick cookware for 15 minutes; and 5) After the test, pour out the quartz stone in the non-stick cookware, and use dishwashing liquid to clean and dry the inner surface of the non-stick cookware.

[0076] Replacement cycle of quartz stone: 1 time / month.

[0077] In the dry burning of mixed sauce test , and the specific parameters are as follows:

[0078] Ingredients: soy sauce, vinegar, cooking wine, monosodium glutamate, salt, sugar, cooking oil.

[0079] Test procedures and steps: 1) Prepare the mixed sauce according to the following weight ratio: completely dissolve all the ingredients in soy sauce: vinegar: cooking wine: monosodium glutamate: salt: sugar: cooking oil = 4:3:2:1:1:2:2 (mass ratio), and mix them evenly to form a special mixed sauce; 2) Take 50 g of the mixed sauce and put it into the non-stick cookware, and shake the non-stick cookware until the sauce evenly covers the bottom of the non-stick cookware; 3) Place the non-stick cookware on the gas stove and dry burn it to 250 °C to 270 °C and keep it warm for 2 min, then stop heating; and 4) Rinse the non-stick cookware with water, and then use dishwashing liquid and a dishcloth to scrub the contaminated area inside the non-stick cookware clean.

[0080] In the boiling of brine test , and the specific parameters are as follows:

[0081] Ingredients: 50 g of table salt, 950 g of water.

[0082] Test procedures and steps: 1) Weigh 50 g of table salt and 950 g of water to prepare 5 wt% brine, and pour the brine into the non-stick cookware; 2) Start timing after the water boils, and keep it slightly boiling for 10 min. During this period, add water according to the situation to keep the concentration constant; and 3) After boiling for the specified time, clean and dry the non-stick cookware with tap water.

[0083] In the frying of quartz stone (iron spatula) test , the specific parameters are as follows:

[0084] Ingredients: 1 Kg of quartz stones with a particle size of 9 mm to 12 mm, oil, vinegar, cooking wine, soy sauce, a little salt.

[0085] Test procedures and steps: 1) Pour 15 g of cooking oil into a non-stick cooking utensil, shake well until the entire inner surface is impregnated, heat until fumes are generated, then pour 1 Kg of quartz stones into the non-stick cooking utensil, add a small amount of vinegar, cooking wine, soy sauce, water, and salt, and stir-fry evenly for 10 min; 2) After completion, clean and dry the inner surface of the non-stick cooking utensil with dishwashing liquid; and 3) Filter the soup stock after each cycle and leave the quartz stones for use in the next cycle.

[0086] Replacement cycle of quartz stones: 1 time / month

[0087] When conducting the accelerated simulation test, at the end of each cycle, determine the non-stick life of the non-stick cooking utensil. When the non-stick cooking utensil exhibits one of the following phenomena, the test end point can be determined: (1) Decrease in non-stickiness: The non-stick grade for frying eggs is grade III for two consecutive cycles; and (2) Appearance damage: The coating shows a fuzzing phenomenon; the diameter of the coating peeling area is greater than 3 mm 2 ; Obvious wear reveals the substrate; The coating has more than 3 piercing scratches (revealing the substrate); Or there is dirt that cannot be washed off with a wet cloth.

[0088] The number of accelerated simulation test cycles experienced when recording the test to the end point is the non-stick life of the non-stick cooking utensil. The more the number of cycles, the longer the non-stick life of the non-stick coating of the non-stick cooking utensil. Generally, when the number of cycles is greater than or equal to 3 cycles, it is considered qualified.

[0089] (2) Test for persistent non-stickiness

[0090] Refer to the persistent non-stickiness test method in 5.6.9 of the national standard GB / T32388 - 2015 to evaluate the persistent non-stickiness of the non-stick cooking utensils prepared in Examples 1 to 3 and Comparative Examples 1 and 2.

[0091] The test results of the non-stick life and persistent non-stickiness of the non-stick cooking utensils prepared in Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1.

[0092] Table 1

[0093] Sample Non-stick property LNE life Permanent non-stick life Comparative Example 1 Ⅰ 2 8000 Comparative Example 2 Ⅰ 1 2000 Example 1 Ⅰ 15 28000 Example 2 Ⅱ 10 20000 Example 3 Ⅱ 7 12000

[0094] Generally, when the LNE life of the non-stick coating is greater than or equal to 5, and the persistent non-stick life of the non-stick coating is greater than or equal to 10000, it can be considered that the non-stick cooking utensil has improved non-stick performance.

[0095] As can be seen from the data in Table 1, compared with Comparative Example 1 and Comparative Example 2, the non-stick coatings of Examples 1 to 3 according to the present invention have improved non-stick life and persistent non-stick property.

[0096] In summary, according to the embodiments of the present invention, since the composite material for the non-stick coating can include a perovskite material and a ductile metal material, the wear resistance, hardness, non-stick life and persistent non-stick property of the non-stick coating can be improved, achieving effects such as stable material and long non-stick life.

[0097] The present invention rationally optimizes the composition of the composite material for the non-stick coating to manufacture a non-stick coating with optimized performance. The non-stick cookware manufactured by using this composite material achieves multiple performances such as spatula resistance performance and persistent non-stick performance, thus greatly improving the user experience.

[0098] Although the present invention has been specifically shown and described with reference to the embodiments of the present invention, those of ordinary skill in the art will understand that various changes in form and details can be made herein without departing from the spirit and scope of the present invention as defined by the claims and their equivalents. The embodiments should be considered only in a descriptive sense and not for the purpose of limitation. Therefore, the scope of the present invention is not defined by the specific embodiments of the present invention, but by the claims, and all differences within this scope will be construed as being included in the present invention.

Claims

1. A composite material for non-stick cookware, characterized in that, the composite material comprises, based on the total weight of the composite material: a mixture of 50 wt% to 80 wt% of a perovskite material and 20 wt% to 50 wt% of a ductile metal material, Among them, the perovskite material is represented by ABO 3 and is a non-sticky molecule. A includes at least one of alkaline earth metals, and B includes at least one of transition metals. wherein the elongation at break of the ductile metal material is greater than or equal to 12%.

2. The composite material according to claim 1, characterized in that, A is Ca and B is Ti.

3. The composite material according to claim 1, characterized in that, the ductile metal material comprises Fe, Al, Cu, Ni or an alloy thereof.

4. The composite material according to claim 1, characterized in that, the average particle size of both the perovskite material and the ductile metal material is 10 μm to 100 μm.

5. A non-stick cookware, characterized in that, the non-stick cookware comprises: a substrate including an inner surface for carrying an article and an outer surface opposite to the inner surface; and a non-stick coating provided on the inner surface of the substrate and comprising the composite material according to any one of claims 1 to 4.

6. The non-stick cookware according to claim 5, characterized in that, the thickness of the non-stick coating is 20 μm to 100 μm.

7. A method for manufacturing a non-stick cookware, characterized in that, the method comprises the following steps: preparing the composite material according to any one of claims 1 to 4; and spraying the composite material onto the substrate of the non-stick cookware by plasma spraying to form a non-stick coating.

8. The method according to claim 7, characterized in that, the plasma spraying is performed under the following conditions: the flow rate of the main gas supply is 1500 L / H to 2000 L / H, the flow rate of the hydrogen supply is 80 L / H to 120 L / H, the voltage is 40 V to 60 V, the current is 450 A to 550 A, and the rate of feeding the composite material is 30 g / min to 70 g / min.

9. The method according to claim 7, characterized in that, the diameter of the nozzle used for plasma spraying is 3 mm to 7 mm and the distance between the nozzle and the substrate of the non-stick cookware is 80 mm to 130 mm.

10. The method according to claim 7, characterized in that, the method further comprises sanding the non-stick coating.

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