High-temperature-resistant non-stick pan coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of non-stick pan coatings, and provides a high-temperature-resistant non-stick pan coating as well as a preparation method and application thereof. The high-temperature-resistant non-stick pan coating is prepared from the following raw material components in parts by weight: 50 to 60 parts of polytetrafluoroethylene resin, 15 to 20 parts of polyethersulfone resin, 3 to 5 parts of ethylene-tetrafluoroethylene copolymer, 10 to 15 parts of wear-resistant filler, 1 to 2 parts of dispersing agent, 5 to 8 parts of anti-settling agent, 1 to 2 parts of flatting agent and 100 parts of water, the wear-resistant filler comprises modified carbon fibers; the modified carbon fibers are prepared by sequentially acidizing carbon fibers and treating the carbon fibers with 2-(3, 4-dihydroxyphenyl) ethylamine. According to the technical scheme, the problem of poor wear resistance of a high-temperature-resistant non-stick pan coating in the related technology is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-stick pot coating, in particular to a high-temperature-resistant non-stick pot coating and a preparation method and application thereof. BACKGROUND

[0002] As a widely used kitchen appliance in modern kitchens, non-stick pots have become one of the essential kitchen appliances in family cooking and catering industries due to their advantages of food not being easy to stick together during cooking and convenient cleaning. The coating, as the core component of non-stick pots to achieve non-stick function, its high-temperature resistance and wear resistance directly determine the use effect and service life of non-stick pots.

[0003] At present, in order to adapt to high-temperature cooking scenes, the mainstream non-stick pot coating on the market mainly uses polytetrafluoroethylene resin as the main base material. The polytetrafluoroethylene resin has extremely low surface energy, can endow the coating with excellent non-stick properties, and has strong chemical stability and good corrosion resistance. However, the polytetrafluoroethylene resin itself has low hardness, and in the daily cooking process, the friction between the pot and the spatula, the impact of food stirring and other factors will cause continuous wear of the coating. After long-term use, the coating is prone to scratches and peeling. Therefore, there is an urgent need for a wear-resistant and high-temperature-resistant non-stick pot coating. SUMMARY

[0004] The present application provides a high-temperature-resistant non-stick pot coating and a preparation method and application thereof, which solves the problem of poor wear resistance of the high-temperature-resistant non-stick pot coating in the related art.

[0005] The technical scheme of the present application is as follows: The present application provides a high-temperature-resistant non-stick pot coating, the raw materials of which include the following components in parts by weight: polytetrafluoroethylene resin 50-60 parts, polyether sulfone resin 15-20 parts, ethylene-tetrafluoroethylene copolymer 3-5 parts, wear-resistant filler 10-15 parts, dispersing agent 1-2 parts, anti-settling agent 5-8 parts, leveling agent 1-2 parts, and water 100 parts. The wear-resistant filler includes modified carbon fibers.

[0006] As a further technical scheme, the preparation method of the modified carbon fibers includes the following steps: A1, carbon fibers are added to a mixed acid solution, stirred, filtered, and washed to obtain acidized carbon fibers; A2, 2-(3,4-dihydroxyphenyl)ethylamine is dissolved in N,N-dimethylformamide, the acidized carbon fibers are added, stirred, a dehydrating agent is added, stirred and reacted, washed, suction filtered, and dried to obtain modified carbon fibers.

[0007] As a further technical scheme, the mass-volume ratio of carbon fibers to mixed acid solution is 0.2g:150-200mL. In step A1, the stirring time is 20-24 hours.

[0008] As a further technical solution, the dehydrating agent includes N,N'-dicyclohexylcarbodiimide.

[0009] As a further technical solution, the mixed acid is composed of sulfuric acid and nitric acid.

[0010] As a further technical solution, the mass concentration of the sulfuric acid is 96%~98%; the mass concentration of the nitric acid is 65%~68%.

[0011] As a further technical solution, the volume ratio of sulfuric acid to nitric acid is 3:1.

[0012] As a further technical solution, in step A1, the stirring time is 20~24h.

[0013] As a further technical solution, in step A1, the stirring temperature is 25°C.

[0014] As a further technical solution, the mass-to-volume ratio of the carbon fiber and N,N-dimethylformamide is 0.2g:150~200mL; The mass ratio of the dehydrating agent to the acidified carbon fiber is 0.5~0.6:0.2; The mass ratio of the carbon fiber to 2-(3,4-dihydroxyphenyl)ethylamine is 0.2:0.6~1.2.

[0015] As a further technical solution, in step A2, the temperature of the stirring reaction is 40~50℃ and the time is 12~16h.

[0016] As a further technical solution, the wear-resistant filler also includes mica powder and / or titanium boride.

[0017] As a further technical solution, when the wear-resistant filler further includes mica powder and titanium boride, the mass ratio of mica powder to titanium boride is 11:5~9.

[0018] In the high-temperature resistant non-stick pan coating of this invention, modified carbon fiber, mica powder, and titanium boride are used in combination. The hard particles of titanium boride bear the main wear, the sheet-like structure of mica provides sliding channels, and the 2-(3,4-dihydroxyphenyl)ethylamine modified carbon fiber macroscopically improves the overall hardness. At the same time, the carbon fiber modified with 2-(3,4-dihydroxyphenyl)ethylamine can also improve the bonding force with mica powder. The three components synergistically improve the wear resistance of the high-temperature resistant non-stick pan coating. Furthermore, when the mass ratio of mica powder to titanium boride is 11:5~9, the wear resistance of the high-temperature resistant non-stick pan coating can be further improved.

[0019] As a further technical solution, the dispersant includes one or both of fatty alcohol polyoxyethylene ether ammonium sulfate and isomeric tridecyl alcohol polyoxyethylene ether.

[0020] In the high-temperature resistant non-stick pan coating of this invention, fatty alcohol polyoxyethylene ether ammonium sulfate and / or isomeric tridecyl alcohol polyoxyethylene ether are used as dispersants. When these dispersants are added, the hydrophobic fatty alcohol groups or isomeric tridecyl alcohol groups are adsorbed on the surface of the wear-resistant filler, while the hydrophilic polyoxyethylene ether segments extend in the aqueous phase, forming a hydrophilic adsorption layer on the surface of the wear-resistant filler particles. This allows the wear-resistant filler particles to be uniformly dispersed, which helps to form a uniform and continuous coating structure and improves the overall performance of the coating.

[0021] As a further technical solution, the anti-settling agent includes one or both of polydimethylsiloxane and fumed silica.

[0022] This invention also proposes a method for preparing a high-temperature resistant non-stick pan coating, comprising the following steps: S1. After mixing the components according to the stated weight proportions, a mixed slurry is obtained; S2. The mixed slurry is coated onto the inner surface of a non-stick pan and dried at 300~350℃ to obtain a high-temperature resistant non-stick pan coating.

[0023] As a further technical solution, the thickness of the high-temperature resistant non-stick coating is 20μm.

[0024] The present invention also proposes the application of the high-temperature resistant non-stick pan coating or the high-temperature resistant non-stick pan coating prepared by the above preparation method in non-stick pans.

[0025] The working principle and beneficial effects of this invention are as follows: In this invention, the wear resistance of the high-temperature resistant non-stick cookware coating is improved by modifying carbon fibers with 2-(3,4-dihydroxyphenyl)ethylamine. Specifically, the amino groups in 2-(3,4-dihydroxyphenyl)ethylamine chemically bond with the acidified carbon fibers, introducing amino and hydroxyl groups onto the carbon fiber surface. This enhances the interaction force between the fluorine atoms in the carbon fibers and the polytetrafluoroethylene resin, resulting in a stronger interfacial bond between the carbon fiber and the polytetrafluoroethylene body. Consequently, the carbon fibers are less likely to peel or detach from the coating. Therefore, by modifying the carbon fibers with 2-(3,4-dihydroxyphenyl)ethylamine, the wear resistance of the high-temperature resistant non-stick cookware coating is improved. Detailed Implementation

[0026] 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.

[0027] In the following examples and comparative examples, the polytetrafluoroethylene resin was DF-102; the polyethersulfone resin was 3601GL30; the ethylene-tetrafluoroethylene copolymer was FS-40; the polydimethylsiloxane was Dow Corning DC184; the fumed silica had a particle size of 30 nm; the silicone leveling agent was BYK-348; the carbon fiber had a length of 20 mm and a diameter of 5 μm; the mica powder had an average particle size of 5 μm; the titanium boride had an average particle size of 80 nm; the sulfuric acid had a mass concentration of 98%; and the nitric acid had a mass concentration of 68%.

[0028] Example 1 The high-temperature resistant non-stick pan coating comprises the following components in parts by weight: 50 parts polytetrafluoroethylene resin, 15 parts polyethersulfone resin, 3 parts ethylene-tetrafluoroethylene copolymer, 10 parts modified carbon fiber, 1 part lauryl alcohol polyoxyethylene ether ammonium sulfate, 5 parts polydimethylsiloxane, 1 part organosilicon leveling agent, and 100 parts water. The preparation method of modified carbon fiber includes the following steps: A1. Add 0.2g of carbon fiber to 150mL of mixed acid solution (sulfuric acid and nitric acid in a volume ratio of 3:1), stir at 25℃ for 20h, filter and wash to obtain acidified carbon fiber; A2. Dissolve 0.6g of 2-(3,4-dihydroxyphenyl)ethylamine in 350mL of N,N-dimethylformamide, add acidified carbon fiber, stir at 40℃ for 30min under nitrogen atmosphere, add 0.5g of N,N'-dicyclohexylcarbodiimide, continue stirring at 40℃ under nitrogen atmosphere for 16h, wash, filter, and dry to obtain modified carbon fiber; A method for preparing a high-temperature resistant non-stick pan coating includes the following steps: S1. After mixing the components evenly according to the above weight proportions, a mixed slurry is obtained; S2. The mixed slurry is coated on the inner surface of the aluminum non-stick pan and dried at 300℃ for 30 minutes to obtain a high-temperature resistant non-stick pan coating with a thickness of 20μm.

[0029] Example 2 The high-temperature resistant non-stick pan coating comprises the following components in parts by weight: 60 parts polytetrafluoroethylene resin, 20 parts polyethersulfone resin, 5 parts ethylene-tetrafluoroethylene copolymer, 15 parts modified carbon fiber, 1 part lauryl alcohol polyoxyethylene ether ammonium sulfate, 1 part isotridecyl alcohol polyoxyethylene ether, 4 parts polydimethylsiloxane, 4 parts fumed silica, 2 parts organosilicon leveling agent, and 100 parts water. The preparation method of modified carbon fiber includes the following steps: A1. Add 0.2g of carbon fiber to 200mL of mixed acid solution (sulfuric acid and nitric acid in a volume ratio of 3:1), stir at 25℃ for 24h, filter and wash to obtain acidified carbon fiber; A2. Dissolve 1.2g of 2-(3,4-dihydroxyphenyl)ethylamine in 400mL of N,N-dimethylformamide, add acidified carbon fiber, stir at 40℃ for 30min under nitrogen atmosphere, add 0.6g of N,N'-dicyclohexylcarbodiimide, continue stirring at 50℃ under nitrogen atmosphere for 12h, wash, filter, and dry to obtain modified carbon fiber; A method for preparing a high-temperature resistant non-stick pan coating includes the following steps: S1. After mixing the components evenly according to the above weight proportions, a mixed slurry is obtained; S2. The mixed slurry is coated on the inner surface of the aluminum non-stick pan and dried at 350℃ for 30 minutes to obtain a high-temperature resistant non-stick pan coating with a thickness of 20μm.

[0030] Example 3 The high-temperature resistant non-stick coating comprises the following components in parts by weight: 55 parts polytetrafluoroethylene resin, 18 parts polyethersulfone resin, 4 parts ethylene-tetrafluoroethylene copolymer, 14 parts modified carbon fiber, 1.5 parts isomeric tridecyl alcohol polyoxyethylene ether, 6 parts fumed silica, 1.5 parts organosilicon leveling agent, and 100 parts water. The preparation method of modified carbon fiber includes the following steps: A1. Add 0.2g of carbon fiber to 150mL of mixed acid solution (sulfuric acid and nitric acid in a volume ratio of 3:1), stir at 25℃ for 24h, filter and wash to obtain acidified carbon fiber; A2. Dissolve 1.0 g of 2-(3,4-dihydroxyphenyl)ethylamine in 380 mL of N,N-dimethylformamide, add acidified carbon fiber, stir at 40 °C for 30 min under nitrogen atmosphere, add 0.55 g of N,N'-dicyclohexylcarbodiimide, continue stirring at 45 °C under nitrogen atmosphere for 14 h, wash, filter, dry to obtain modified carbon fiber; A method for preparing a high-temperature resistant non-stick pan coating includes the following steps: S1. After mixing the components evenly according to the above weight proportions, a mixed slurry is obtained; S2. The mixed slurry is coated on the inner surface of the aluminum non-stick pan and dried at 320℃ for 30 minutes to obtain a high-temperature resistant non-stick pan coating with a thickness of 20μm.

[0031] Example 4 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber and 8 parts of mica powder.

[0032] Example 5 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber and 8 parts of titanium boride.

[0033] Example 6 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber, 5.5 parts of mica powder, and 2.5 parts of titanium boride.

[0034] Example 7 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber, 4.4 parts of mica powder, and 3.6 parts of titanium boride.

[0035] Example 8 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber, 6 parts of mica powder, and 2 parts of titanium boride.

[0036] Example 9 The only difference between this embodiment and Embodiment 3 is that 14 parts of modified carbon fiber are replaced with 6 parts of modified carbon fiber, 3 parts of mica powder, and 5 parts of titanium boride.

[0037] Comparative Example 1 The only difference between this comparative example and Example 3 is that the modified carbon fiber is replaced with carbon fiber.

[0038] Comparative Example 2 The only difference between this comparative example and Example 3 is that no modified carbon fiber is added.

[0039] Experimental Example 1 The abrasion resistance of the high-temperature resistant non-stick pan coatings prepared in Examples 1-9 and Comparative Examples 1-2 were tested respectively: Abrasion resistance: The mass loss of the non-stick pan coating was tested using the method specified in standard GB / T 1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method". The load was 300g and the number of rubber grinding wheel rotations was set to 200. The results are shown in Table 1 below.

[0040] Table 1 Abrasion resistance test results

[0041] By comparing the data of Example 3 and Comparative Examples 1-2, the high-temperature resistant non-stick pan coating prepared by adding 2-(3,4-dihydroxyphenyl)ethylamine modified carbon fiber in Example 3 had a smaller mass loss than that in Comparative Examples 1-2. This indicates that the wear resistance of the high-temperature resistant non-stick pan coating can be improved by adding 2-(3,4-dihydroxyphenyl)ethylamine modified carbon fiber.

[0042] Comparing the data from Examples 4-9, Examples 6-9, which used modified carbon fiber, mica powder, and titanium boride in combination, showed that the mass loss of the high-temperature resistant non-stick pan coating was smaller than that of Examples 4-5. This indicates that the use of modified carbon fiber, mica powder, and titanium boride in combination further improved the wear resistance of the high-temperature resistant non-stick pan coating. Comparing the data from Examples 6-9, Examples 6-7, by further optimizing the mass ratio of mica powder and titanium boride, achieved a wear resistance of 11:5-9.

[0043] Experimental Example 2 The high-temperature resistance of the non-stick coatings prepared in Examples 1-3 was tested respectively: High temperature resistance: Place the high temperature resistant non-stick pan coating in a constant temperature oven at 300℃ and bake for 2 hours. Observe whether the coating changes color or peels off, bubbles, or cracks to test its high temperature resistance.

[0044] The results are shown in Table 2 below.

[0045] Table 2 High Temperature Resistance Test Results

[0046] According to the data in Table 2, the high-temperature resistant non-stick pan coatings prepared in Examples 1-3 of the present invention showed no color change, peeling, blistering, or cracking after baking at 300℃ for 2 hours, indicating that the high-temperature resistant non-stick pan coatings prepared by the present invention have good high-temperature resistance.

[0047] 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 high-temperature resistant non-stick pan coating, characterized in that, The raw materials include the following components by weight: 50-60 parts of polytetrafluoroethylene resin, 15-20 parts of polyethersulfone resin, 3-5 parts of ethylene-tetrafluoroethylene copolymer, 10-15 parts of wear-resistant filler, 1-2 parts of dispersant, 5-8 parts of anti-settling agent, 1-2 parts of leveling agent, and 100 parts of water. The wear-resistant filler includes modified carbon fiber; the modified carbon fiber is prepared by sequentially acidifying and treating carbon fiber with 2-(3,4-dihydroxyphenyl)ethylamine.

2. The high-temperature resistant non-stick pan coating according to claim 1, characterized in that, The method for preparing the modified carbon fiber includes the following steps: A1. Add carbon fiber to a mixed acid solution, stir, filter, and wash to obtain acidified carbon fiber; A2. Dissolve 2-(3,4-dihydroxyphenyl)ethylamine in N,N-dimethylformamide, add the acidified carbon fiber, stir, add a dehydrating agent, stir to react, wash, filter, and dry to obtain modified carbon fiber.

3. The high-temperature resistant non-stick pan coating according to claim 2, characterized in that, The mass-to-volume ratio of the carbon fiber to the mixed acid solution is 0.2g:150~200mL; In step A1, the stirring time is 20-24 hours.

4. The high-temperature resistant non-stick pan coating according to claim 2, characterized in that, The mass-to-volume ratio of the carbon fiber and N,N-dimethylformamide is 0.2 g: 150~200 mL; The mass ratio of the dehydrating agent to carbon fiber is 0.5~0.6:0.2; The mass ratio of the carbon fiber to 2-(3,4-dihydroxyphenyl)ethylamine is 0.2:0.6~1.

2.

5. The high-temperature resistant non-stick pan coating according to claim 2, characterized in that, In step A2, the temperature of the stirring reaction is 40~50℃ and the time is 12~16h.

6. The high-temperature resistant non-stick pan coating according to claim 1, characterized in that, The wear-resistant filler also includes mica powder and / or titanium boride.

7. The high-temperature resistant non-stick pan coating according to claim 6, characterized in that, When the wear-resistant filler comprises mica powder and titanium boride, the mass ratio of mica powder to titanium boride is 11:5~9.

8. The high-temperature resistant non-stick pan coating according to claim 1, characterized in that, The dispersant includes one or both of fatty alcohol polyoxyethylene ether ammonium sulfate and isotridecyl alcohol polyoxyethylene ether; The anti-settling agent includes one or both of polydimethylsiloxane and fumed silica.

9. A method for preparing a high-temperature resistant non-stick pan coating, used to prepare the high-temperature resistant non-stick pan coating according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. After mixing the components according to the stated weight proportions, a mixed slurry is obtained; S2. The mixed slurry is coated onto the inner surface of a non-stick pan and dried at 300~350℃ to obtain a high-temperature resistant non-stick pan coating.

10. The application of a high-temperature resistant non-stick pan coating according to any one of claims 1 to 8 or a high-temperature resistant non-stick pan coating prepared by the preparation method according to claim 9 in a non-stick pan.

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