A wear-resistant non-stick pan coating, a method for producing the same, and a non-stick pan

Abstract

The present application relates to the technical field of non-stick pot coating, and discloses a wear-resistant non-stick pot coating, a preparation method thereof and a non-stick pot.The wear-resistant non-stick pot coating comprises the following components in parts by weight: 24-36 parts of polytetrafluoroethylene, 7-14 parts of polyimide, 6-10 parts of filler, 0.3-0.9 parts of leveling agent, 0.4-0.8 parts of defoaming agent, 0.2-0.4 parts of wetting agent, 0.8-1.6 parts of silane coupling agent, 0.4-1.0 parts of dispersing agent, and 30-40 parts of solvent.The filler comprises core-shell structure material, the inner core is inorganic material, and the outer shell is organic-inorganic hybrid layer.The core-shell structure material is prepared by a sol-gel method with tetraethyl orthosilicate, polydimethylsiloxane and inorganic material as raw materials.The above technical solution solves the problem of insufficient wear resistance of fluoropolymer non-stick pot coating in the prior art.

Description

Technical Field

[0001] This invention relates to the field of non-stick pan coating technology, specifically to a wear-resistant non-stick pan coating, its preparation method, and a non-stick pan. Background Technology

[0002] Non-stick pans are a common household cookware. The main difference between them and other ordinary metal pans is that the inner surface of the pan is coated with a non-stick coating. This type of coating material has the characteristics of good lubricity, low coefficient of friction and low surface tension, which makes it difficult for substances to adhere to the non-stick pan, so food is not easy to stick to it.

[0003] Common non-stick coatings are mainly divided into two categories: ceramic coatings (such as silica) and fluoropolymer coatings (such as polytetrafluoroethylene). Ceramic coatings offer better scratch resistance but are more expensive and have limited application scenarios. Fluoropolymer coatings offer better non-stick properties and are less expensive. Therefore, fluoropolymer coatings have a wider range of applications, but they lack good abrasion resistance and are prone to wear during use, losing their non-stick properties. Therefore, it is necessary to improve the abrasion resistance of these coatings. Summary of the Invention

[0004] This invention proposes a wear-resistant non-stick pan coating, its preparation method, and a non-stick pan, solving the problem of insufficient wear resistance of fluoropolymer non-stick pan coatings in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a wear-resistant non-stick pan coating, comprising the following components in parts by weight: 24-36 parts polytetrafluoroethylene, 7-14 parts polyimide, 6-10 parts filler, 0.3-0.9 parts leveling agent, 0.4-0.8 parts defoamer, 0.2-0.4 parts wetting agent, 0.8-1.6 parts silane coupling agent, 0.4-1.0 parts dispersant, and 30-40 parts solvent; The filler includes a core-shell structured material; the core of the core-shell structured material is an inorganic material, and the outer shell is an organic-inorganic hybrid layer; The core-shell structure material is prepared by sol-gel method using tetraethyl orthosilicate, polydimethylsiloxane, and inorganic materials as raw materials.

[0006] As a further technical solution, the inorganic material includes one or more of titanium dioxide, aluminum oxide, silicon dioxide, zinc oxide, and zirconium oxide.

[0007] As a further technical solution, the mass ratio of the tetraethyl orthosilicate, polydimethylsiloxane and inorganic materials is 6:3:40~50.

[0008] As a further technical solution, the preparation method of the core-shell structure material includes the following steps: S1. Add tetraethyl orthosilicate and polydimethylsiloxane to ethanol, stir, and adjust the pH to 8.5-9.5 to obtain a modified solution; S2. Add inorganic material to the modified solution, stir, and dry to obtain core-shell structured material.

[0009] As a further technical solution, the mass ratio of the tetraethyl orthosilicate, polydimethylsiloxane and ethanol is 6:3:90~100.

[0010] As a further technical solution, in step S1, the stirring time is 6~7 hours and the rotation speed is 120~150 r / min.

[0011] As a further technical solution, in step S2, the stirring speed is 120~150 r / min and the time is 11~13 h.

[0012] As a further technical solution, the drying temperature is 50~60℃ and the time is 10~12h.

[0013] As a further technical solution, the leveling agent includes leveling agent BNK-LK845.

[0014] As a further technical solution, the defoamer includes an organosilicone defoamer.

[0015] In the wear-resistant non-stick pan coating of the present invention, the defoamer can effectively avoid coating defects caused by the presence of foam, and ensure the uniformity and density of the coating; the defoamer can be one or two of polyether defoamers and silicone defoamers, preferably silicone defoamers.

[0016] As a further technical solution, the wetting agent includes one or both of wetting agent BYK-348 and wetting agent TEGO Wet 270.

[0017] In the wear-resistant non-stick pan coating of this invention, the wetting agent enables the coating to adhere tightly to the surface of the cookware substrate, thereby improving the adhesion of the coating and reducing the risk of coating peeling off.

[0018] As a further technical solution, the solvent includes one or both of N-methylpyrrolidone and dimethylformamide.

[0019] As a further technical solution, the filler also includes fluoride.

[0020] In the wear-resistant non-stick pan coating of this invention, the core-shell structure material and fluoride are used together. The fluorine atoms in the introduced fluoride form stable chemical bonds with the surrounding atoms, which can effectively prevent the thermal decomposition and thermal oxidation reaction of the coating molecules at high temperatures. The organic and inorganic hybrid layer of the core-shell structure material plays a certain role in buffering and isolating at high temperatures, reducing the direct impact of heat on the coating structure. The thermal conductivity of the inorganic material at high temperatures also allows the heat to be quickly dispersed. The two work together to significantly improve the thermal stability of the non-stick pan coating.

[0021] As a further technical solution, the mass ratio of the core-shell structural material to the fluoride is 9:1~1.6.

[0022] In the wear-resistant non-stick pan coating of this invention, when the mass ratio of core-shell structure material to fluoride is 9:1 to 1.6, it can ensure the improvement of the thermal stability of the non-stick pan coating without causing agglomeration due to excessive addition of fluoride, thus preventing coating defects.

[0023] As a further technical solution, the fluoride includes one or more of fluorinated titanium dioxide, fluorinated silicon, and fluorinated graphene, preferably fluorinated graphene.

[0024] This invention also proposes a method for preparing a wear-resistant non-stick pan coating, which includes the following steps: Polytetrafluoroethylene, polyimide and solvent are mixed to obtain a mixture; Add filler, leveling agent, defoamer, wetting agent, silane coupling agent and dispersant to the mixture, stir to obtain non-stick pan coating; apply the non-stick pan coating to the inner surface of the pan, dry to obtain wear-resistant non-stick pan coating.

[0025] The present invention also proposes a non-stick pan, comprising a pan body and a wear-resistant non-stick coating on the inner surface of the pan body; the wear-resistant non-stick coating is the wear-resistant non-stick coating described above or the wear-resistant non-stick coating prepared by the preparation method described above.

[0026] The working principle and beneficial effects of this invention are as follows: In this invention, a core-shell structure material is added as a filler to the non-stick pan coating, improving its wear resistance. The core-shell structure material is prepared using tetraethyl orthosilicate and polydimethylsiloxane as a modifying solvent. Tetraethyl orthosilicate undergoes hydrolysis and polycondensation in an ethanol solution. The silicon-oxygen bonds in polydimethylsiloxane intertwine with the silicon-oxygen network formed by the hydrolysis and polycondensation of tetraethyl orthosilicate, forming an organic-inorganic hybrid structure. Adding the modifying solvent to the inorganic material containing hydroxyl groups allows the hydroxyl groups on the surface of the inorganic material to react with the organic and inorganic bonds of the modifying solvent. The combination of inorganic and inorganic hybrid structures, with organic and inorganic hybrid layers firmly coating the surface of inorganic materials, allows the inorganic materials themselves to exhibit certain wear resistance when added to non-stick cookware coatings. The presence of organic and inorganic hybrid layers enhances the compatibility and dispersibility with other components, enabling the inorganic materials to be more evenly distributed in the coating and better achieving the wear resistance of the inorganic materials. At the same time, when subjected to friction, the organic and inorganic hybrid layers can buffer stress through their own flexibility, reducing coating damage caused by stress concentration, thereby significantly improving the wear resistance of the non-stick cookware coating. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following examples and comparative examples, polytetrafluoroethylene (PTFE) is designated as DF-101 and manufactured by Shandong Huaxia Shenzhou New Material Co., Ltd.; polyimide is designated as TP-8169; silicone defoamer is designated as THIX-278 and manufactured by Yantai Hengxin Chemical Technology Co., Ltd.; titanium dioxide has a particle size of 10,000 mesh; silicon dioxide has a particle size of 10,000 mesh; alumina has a particle size of 9,000 mesh; and fluorinated graphene has a fluorine atom content of 47wt%~58wt%.

[0029] Example 1 A wear-resistant non-stick pan coating comprises the following components in parts by weight: 24 parts polytetrafluoroethylene, 7 parts polyimide, 6 parts filler, 0.3 parts leveling agent BNK-LK845, 0.4 parts silicone defoamer, 0.2 parts wetting agent BYK-348, 1 part silane coupling agent KH550, 0.4 parts dispersant BYK-163, 15 parts N-methylpyrrolidone, and 15 parts dimethylformamide; The filler is a core-shell structure material; The preparation method of core-shell structured materials includes the following steps: Tetraethyl orthosilicate and polydimethylsiloxane (mass ratio of tetraethyl orthosilicate, polydimethylsiloxane and ethanol is 6:3:90) were added to ethanol, and the mixture was stirred at 120 r / min for 7 h. The pH was adjusted to 8.5 to obtain the modified solvent. Then, titanium dioxide (the mass ratio of tetraethyl orthosilicate and polydimethylsiloxane to titanium dioxide is 6:3:40) is added to the modified solvent, and the mixture is stirred at 120 r / min for 13 h. Finally, it is dried at 50 °C for 12 h to obtain the core-shell structure material. A method for preparing a wear-resistant non-stick pan coating includes the following steps: Polytetrafluoroethylene, polyimide, N-methylpyrrolidone and dimethylformamide were mixed at 2000 rpm for 1 hour to obtain a mixture; Add filler, leveling agent BNK-LK845, silicone defoamer, wetting agent BYK-348, silane coupling agent KH550 and dispersant BYK-163 to the mixture, stir for 3 hours to obtain non-stick pan coating; The non-stick coating was sprayed onto the inner surface of the pan and dried at 350°C for 35 minutes to obtain a wear-resistant non-stick coating with a thickness of 30 μm.

[0030] Example 2 A wear-resistant non-stick pan coating comprises the following components in parts by weight: 36 parts polytetrafluoroethylene, 14 parts polyimide, 10 parts filler, 0.9 parts leveling agent BNK-LK845, 0.8 parts silicone defoamer, 0.4 parts wetting agent TEGO Wet 270, 1.6 parts silane coupling agent KH550, 1.0 part dispersant BYK-163, 18 parts N-methylpyrrolidone, and 22 parts dimethylformamide; The filler is a core-shell structure material; The preparation method of core-shell structured materials includes the following steps: Tetraethyl orthosilicate and polydimethylsiloxane (mass ratio of tetraethyl orthosilicate and polydimethylsiloxane to ethanol is 6:3:100) were added to ethanol, and the mixture was stirred at 150 r / min for 6 h. The pH was adjusted to 9.5 to obtain the modified solvent. Then, silica (the mass ratio of tetraethyl orthosilicate and polydimethylsiloxane to silica is 6:3:50) is added to the modified solvent, and the mixture is stirred at 150 r / min for 11 h. Finally, it is dried at 60 °C for 10 h to obtain the core-shell structure material. A method for preparing a wear-resistant non-stick pan coating includes the following steps: Polytetrafluoroethylene, polyimide, N-methylpyrrolidone and dimethylformamide were mixed at 2000 rpm for 1 hour to obtain a mixture; Add filler, leveling agent BNK-LK845, silicone defoamer, wetting agent TEGO Wet 270, silane coupling agent KH550 and dispersant BYK-163 to the mixture, stir for 3 hours to obtain non-stick pan coating; The non-stick coating was sprayed onto the inner surface of the pan and dried at 350°C for 35 minutes to obtain a wear-resistant non-stick coating with a thickness of 30 μm.

[0031] Example 3 A wear-resistant non-stick pan coating comprises the following components in parts by weight: 30 parts polytetrafluoroethylene, 10 parts polyimide, 8 parts filler, 0.5 parts leveling agent BNK-LK845, 0.6 parts silicone defoamer, 0.3 parts wetting agent BYK-348, 1.2 parts silane coupling agent KH550, 0.7 parts dispersant BYK-163, 15 parts N-methylpyrrolidone, and 20 parts dimethylformamide; The filler is a core-shell structure material; The preparation method of core-shell structured materials includes the following steps: Tetraethyl orthosilicate and polydimethylsiloxane (mass ratio of tetraethyl orthosilicate, polydimethylsiloxane and ethanol is 6:3:95) were added to ethanol, and the mixture was stirred at 130 r / min for 6.5 h. The pH was then adjusted to 9.0 to obtain the modified solvent. Then, alumina (the mass ratio of tetraethyl orthosilicate and polydimethylsiloxane to alumina is 6:3:46) is added to the modified solvent, and the mixture is stirred at 130 r / min for 12 h. Finally, it is dried at 55 °C for 11 h to obtain the core-shell structure material. A method for preparing a wear-resistant non-stick pan coating includes the following steps: Polytetrafluoroethylene, polyimide, N-methylpyrrolidone and dimethylformamide were mixed at 2000 rpm for 1 hour to obtain a mixture; Add filler, leveling agent BNK-LK845, silicone defoamer, wetting agent BYK-348, silane coupling agent KH550 and dispersant BYK-163 to the mixture, stir for 3 hours to obtain non-stick pan coating; The non-stick coating was sprayed onto the inner surface of the pan and dried at 350°C for 35 minutes to obtain a wear-resistant non-stick coating with a thickness of 30 μm.

[0032] Example 4 The only difference between this embodiment and Embodiment 3 is that the filler is a core-shell structure material with a mass ratio of 9:2 and fluorinated graphene.

[0033] Example 5 The only difference between this embodiment and Embodiment 3 is that the filler is a core-shell structure material with a mass ratio of 9:1.6 and fluorinated graphene.

[0034] Example 6 The only difference between this embodiment and Embodiment 3 is that the filler is a core-shell structure material with a mass ratio of 9:1 and fluorinated graphene.

[0035] Example 7 The only difference between this embodiment and Embodiment 3 is that the filler is a core-shell structure material with a mass ratio of 9:0.8 and fluorinated graphene.

[0036] Comparative Example 1 The only difference between this comparative example and Example 3 is that the filler is fluorinated graphene.

[0037] Comparative Example 2 The only difference between this comparative example and Example 3 is that the filler is alumina.

[0038] Comparative Example 3 The only difference between this comparative example and Example 3 is that the filler is tetraethyl orthosilicate, polydimethylsiloxane, and alumina in a mass ratio of 6:3:46.

[0039] Comparative Example 4 The only difference between this comparative example and Example 3 is that the filler is silane coupling agent modified alumina; A method for preparing silane coupling agent modified alumina includes the following steps: The silane coupling agent KH550 was dissolved in a mixed solution of ethanol and deionized water (the volume ratio of ethanol to water was 1:1.8, and the mass ratio of silane coupling agent KH550 to the mixed solution was 1:30); it was hydrolyzed at 55℃ for 1 h, and the pH was adjusted to 5 to obtain the coupling agent solution. Then, alumina (the mass ratio of alumina to silane coupling agent KH550 is 1:0.05) is added to the coupling agent solution, and the mixture is stirred at 130 r / min for 6 h. Finally, it is dried in an oven at 80 ℃ for 12 h to obtain silane coupling agent modified alumina.

[0040] The wear-resistant non-stick coatings obtained in Examples 1-7 and Comparative Examples 1-4 were tested according to the following method: 1. Mass loss: According to the test method specified in GB / T 1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotary rubber grinding wheel method", the total load is 750g and the number of grinding revolutions is 400. 2. Thermal stability: According to the test method specified in GB / T 1735-2009 "Determination of heat resistance of paints and varnishes", the heat preservation time is 5 hours, and the standard is that there is no obvious softening or damage when the specified temperature is reached; The test results are shown in Table 1: Table 1. Performance test results of the wear-resistant non-stick coatings obtained in Examples 1-7 and Comparative Examples 1-4

[0041] 1. Compared with Comparative Examples 1 to 4, the wear amount of the wear-resistant non-stick pan coatings prepared in Examples 1 to 7 is much lower than that in Comparative Examples 1 to 4, indicating that the addition of core-shell structure materials to the coating in this invention can significantly improve the wear resistance of the non-stick pan coating.

[0042] 2. Compared with Examples 3-7 and Comparative Example 1, the thermal stability of the wear-resistant non-stick pan coatings prepared in Examples 4-7 is better than that in Examples 3 and Comparative Example 1, indicating that the thermal stability of the wear-resistant non-stick pan coating is improved when the core-shell structure material and fluorinated graphene are used together. The thermal stability of the wear-resistant non-stick pan coatings prepared in Examples 5-6 is better than that in Examples 3-4, Example 7 and Comparative Example 1, indicating that further limiting the mass ratio of the core-shell structure material to fluorinated graphene to 9:1-1.6 can further improve the thermal stability of the wear-resistant non-stick pan coating.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wear-resistant non-stick pan coating, characterized in that, The product comprises the following components in parts by weight: 24-36 parts polytetrafluoroethylene, 7-14 parts polyimide, 6-10 parts filler, 0.3-0.9 parts leveling agent, 0.4-0.8 parts defoamer, 0.2-0.4 parts wetting agent, 0.8-1.6 parts silane coupling agent, 0.4-1.0 parts dispersant, and 30-40 parts solvent; The filler includes a core-shell structured material; the core of the core-shell structured material is an inorganic material, and the outer shell is an organic-inorganic hybrid layer; The core-shell structure material is prepared by sol-gel method using tetraethyl orthosilicate, polydimethylsiloxane and inorganic materials as raw materials. The inorganic material includes one or more of titanium dioxide, aluminum oxide, silicon dioxide, zinc oxide, and zirconium oxide; The mass ratio of tetraethyl orthosilicate, polydimethylsiloxane and inorganic material is 6:3:40~50; The method for preparing the core-shell structured material includes the following steps: S1. Add tetraethyl orthosilicate and polydimethylsiloxane to ethanol, stir, and adjust the pH to 8.5-9.5 to obtain a modified solution; S2. Add inorganic material to the modified solution, stir, and dry to obtain core-shell structured material; The mass ratio of tetraethyl orthosilicate, polydimethylsiloxane and ethanol is 6:3:90~100.

2. The wear-resistant non-stick pan coating according to claim 1, characterized in that, The leveling agent includes leveling agent BNK-LK845; The defoamer includes silicone defoamers; The wetting agent includes one or both of wetting agent BYK-348 and wetting agent TEGO Wet 270; The solvent includes one or both of N-methylpyrrolidone and dimethylformamide.

3. The wear-resistant non-stick pan coating according to claim 1, characterized in that, The filler also includes a fluoride; the fluoride is fluorinated graphene.

4. The wear-resistant non-stick pan coating according to claim 3, characterized in that, The mass ratio of the core-shell structural material to the fluoride is 9:1 to 1.

6.

5. A method for preparing a wear-resistant non-stick pan coating, characterized in that, The preparation of a wear-resistant non-stick pan coating according to any one of claims 1 to 4 includes the following steps: Polytetrafluoroethylene, polyimide and solvent are mixed to obtain a mixture; Add filler, leveling agent, defoamer, wetting agent, silane coupling agent and dispersant to the mixture, stir to obtain non-stick pan coating; apply the non-stick pan coating to the inner surface of the pan, dry to obtain wear-resistant non-stick pan coating.

6. A non-stick pan, characterized in that, The invention includes a pot body and a wear-resistant non-stick coating on the inner surface of the pot body; the wear-resistant non-stick coating is the wear-resistant non-stick coating according to any one of claims 1 to 4 or the wear-resistant non-stick coating prepared by the preparation method according to claim 5.

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