Non-stick ceramic coating, method of preparation and use thereof

Abstract

The present application relates to a kind of non-stick ceramic coating, preparation method and its application, the ceramic coating is made by A, B, C three components with 100:60~100:6~16 Weight ratio, by weight parts, the A component is made by the following raw materials mixing dispersion: silica sol 20~79 parts, tetramethyl diphenyl disiloxane 2~20 parts, filler 10~29 parts, temperature-resistant pigment 0~30 parts, water 0~30 parts, dispersing agent 0~10 parts, A component raw material total is 100 weight parts;The B component is by the following raw materials mixing: silane 59~85 parts, silane coupling agent 0-10 parts, silicone oil 1~10 parts, catalyst 0~5 parts, B component raw material total is 60~100 weight parts;The C component is by the following raw materials mixing: solvent 0~15 parts, levelling agent 0~10 parts, defoaming agent 0~5 parts, C component raw material total is 6~16 weight parts.

Description

Technical Field

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

[0002] Ceramic coatings are inorganic coatings with a Si-O-Si cross-linked structure, similar to ceramics or glass, formed by the hydrolysis and polymerization of silica sol and siloxanes under the catalysis of organic acids. They exhibit excellent high-temperature resistance, do not decompose at high temperatures, and do not release toxic gases. Furthermore, the coatings possess high hardness, good wear resistance, and good non-stick properties. However, their non-stick durability is slightly inferior to water-based fluorinated coatings. The non-stick properties of ceramic coatings primarily originate from the methyl (-CH3) groups on the coating surface. Since current ceramic coatings rely on silicone oil in their components to provide these methyl (-CH3) groups, the number of these groups gradually decreases under high temperatures, during cooking, or with frequent detergent cleaning. Moreover, the proportion of silicone oil added to ceramic coatings is very low; excessive addition results in oil floating, severely affecting the performance of the ceramic coating. Therefore, the non-stick durability of ceramic coatings is relatively poor compared to water-based fluorinated coatings.

[0003] CN201510954017 discloses a water-based ceramic non-stick coating for kitchenware surfaces and its preparation method. It utilizes a composite of ceramic non-stick coating resin and polytetrafluoroethylene resin, relying on non-stick additives in the ceramic coating to provide initial non-stick properties, while the fluorocarbon resin provides durable non-stick properties. However, this invention suffers from compatibility issues when the ceramic resin and fluorocarbon resin are combined. When two resins with different surface tensions are mixed, delamination easily occurs due to the difference in surface tension.

[0004] CN112759963A discloses a non-stick ceramic coating for cookware and its preparation method. This method utilizes silicone oils of different molecular weights distributed at different locations within the coating to enhance its long-lasting non-stick performance, aiming to replenish the non-stick properties by allowing silicone oil in the lower layers to rise after the upper layer is lost. While this method can improve non-stick performance to some extent, the total amount of silicone oil added is very low. Under high temperatures, during cooking abrasion, or after washing with detergent, the number of methyl (-CH3) groups on the surface gradually decreases rapidly. This is the main reason why the non-stick properties of the ceramic coating decrease after a period of use. Because the main component of detergents is surfactant, which is a compound containing both hydrophilic and lipophilic groups in its molecular structure, the silicone oil is gradually washed away during cleaning and use, thus failing to achieve long-term non-stick performance. Summary of the Invention

[0005] The purpose of this invention is to provide a non-stick ceramic coating that, through a special formula combination, possesses comprehensive non-stick properties such as high-temperature resistance, salt water resistance, detergent resistance, and abrasion resistance.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A non-stick ceramic coating, wherein the ceramic coating is made of three components A, B, and C in a weight ratio of 100:60 to 100:6 to 16, by weight parts,

[0008] The A component is prepared by mixing and dispersing the following raw materials: 20-79 parts of silica sol, 2-20 parts of tetramethyldiphenyldisiloxane, 10-29 parts of filler, 0-30 parts of heat-resistant pigment, 0-30 parts of water, and 0-10 parts of dispersant. The total weight of the A component raw materials is 100 parts.

[0009] The B component is a mixture of the following raw materials: 59-85 parts of silane, 0-10 parts of silane coupling agent, 1-10 parts of silicone oil, 0-5 parts of catalyst, and the total weight of the B component raw materials is 60-100 parts of the weight.

[0010] The C component is composed of the following raw materials: 0-15 parts solvent, 0-10 parts leveling agent, 0-5 parts defoamer, and the total weight of the C component raw materials is 6-16 parts.

[0011] The molecular structural formula of the tetramethyldiphenyldisiloxane described in this invention is as follows: One mol of tetramethyldiphenyldisiloxane hydrolyzes to generate 2 mol of dimethylphenylsilanol. Each dimethylphenylsilanol molecule carries only one silanol hydroxyl group (—Si-OH). This invention is the first to add tetramethyldiphenyldisiloxane to a coating to obtain a ceramic coating containing a large amount of methyl (-CH3) and phenyl groups. The reaction mechanism is as follows: First, tetramethyldiphenyldisiloxane hydrolyzes to generate dimethylphenylsilanol, as shown in the reaction formula.

[0012]

[0013] Then, because there are many hydroxyl groups on the silica sol, dimethylphenylsilanol undergoes a graft copolymerization reaction with the silica sol, as shown in the following reaction formula:

[0014]

[0015] Then, dimethylphenylsilanol undergoes a graft copolymerization reaction with a silane containing multiple hydroxyl groups for crosslinking, as shown in the following reaction formula:

[0016]

[0017] Meanwhile, the silica sol will also undergo a cross-linking reaction with silanes containing multiple hydroxyl groups during this process; finally, a ceramic coating containing a large amount of methyl (-CH3) and phenyl groups at various positions will be obtained.

[0018] First, this invention involves adding tetramethyldiphenyldisiloxane to the coating, allowing silica sol to undergo a graft copolymerization reaction with tetramethyldiphenyldisiloxane, followed by a graft copolymerization reaction between tetramethyldiphenyldisiloxane and silane. Simultaneously, the silica sol and silane undergo a cross-linking reaction under the action of a catalyst, forming a network structure where each contains the other. Second, it involves adding fillers with excellent wear resistance, such as zirconium oxide and silicon carbide with different particle sizes, to the coating. Finally, it involves increasing the amount of cross-linking components to improve the coating density. Ultimately, this results in a ceramic coating that exhibits excellent properties such as high-temperature resistance, salt water resistance, detergent resistance, and wear resistance.

[0019] Preferably, the silica sol is an alkaline silica sol with a solid mass fraction of 15%-40% and a particle size of 5-50 nm.

[0020] Preferably, the formulation of component A of the ceramic coating is as follows: 40-69 parts of silica sol, 6-18 parts of tetramethyldiphenyldisiloxane, 10-29 parts of filler, 0-30 parts of heat-resistant pigment, 0-30 parts of water, and 0-5 parts of dispersant, with a total of 100 parts by weight of raw materials in component A; more preferably, in component A, tetramethyldiphenyldisiloxane is 10-14 parts, i.e., 10-14 wt%.

[0021] Preferably, the filler includes one or a combination of several of the following: mica, zirconium oxide, talc, silicon carbide, alumina powder, silicon whiskers, silica, barite, silica fume or glass flakes.

[0022] The pigment is one or a combination of several of the following: titanium dioxide, iron oxide black, carbon black, copper chromium black, manganese iron black, iron oxide yellow, titanium yellow, bismuth yellow, iron oxide red, cobalt blue, phthalocyanine blue, phthalocyanine green, cobalt green, metallic pigments, iron oxide green, or pearlescent pigments; the dispersant is an aqueous dispersant, the defoamer is an aqueous defoamer, and the leveling agent is an aqueous leveling agent.

[0023] Preferably, based on 100 parts by weight of component A, the silane in component B comprises 75-85 parts. Increasing the amount of crosslinking components such as silane can improve the density of the coating. Under this preferred weight ratio, a denser internal structure of the ceramic coating can be achieved, and the coating will not be too brittle to easily crack.

[0024] As a preferred embodiment, based on a total of 100 parts by weight of raw materials in component A, the silane in component B is 40-42 parts of methyltrimethoxysilane, 15-18 parts of methyltriethoxysilane, and 20-25 parts of tetramethoxysilane.

[0025] As a preferred option, in component B,

[0026] The silane is one or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane.

[0027] The silane coupling agent is one or more of γ-(2,3-epoxypropane)propyltrimethoxysilane, γ-(2,3-epoxypropane)propyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-aminopropyltriethoxysilane.

[0028] The silicone oil mentioned is one or more of dimethyl silicone oil, hydroxyl silicone oil, hydrogen-containing silicone oil, phenolic hydroxyl silicone oil, amino silicone oil, alcoholic hydroxyl silicone oil, and mercapto silicone oil;

[0029] The catalyst is one or more of formic acid, acetic acid, propionic acid, hydrochloric acid, and citric acid.

[0030] Preferably, the filler is a combination of zirconium oxide and silicon carbide in a mass ratio of 2-3:1, with zirconium oxide having a particle size of 5-15 μm and silicon carbide having a particle size of 2-5 μm. Combining zirconium oxide and silicon carbide fillers with different particle sizes can improve the wear resistance of the coating.

[0031] A method for preparing the aforementioned non-stick ceramic coating, the method comprising the following steps:

[0032] S1. Mix the raw materials of component A according to the formula, grind them to a fineness of 15μm under a high-speed grinding and dispersing machine, and filter to obtain component A;

[0033] S2, component A and component B are mixed and rolled at 10-30℃ for 4-10 hours at a speed of 1000rpm to 1600rpm. After curing, component C is added according to the formula amount and stirred evenly to obtain a non-stick ceramic coating that can be sprayed.

[0034] As a preferred option, the non-stick ceramic coating formulation by weight is as follows:

[0035] Component A: 60kg silica sol, 10kg tetramethyldiphenyldisiloxane, 1kg dispersant, 3kg silicon carbide, 9kg zirconium oxide, 17kg copper chromium black; zirconium oxide has a particle size of 5-15μm, and silicon carbide has a particle size of 2-5μm.

[0036] Component B: 40 kg methyltrimethoxysilane, 15 kg methyltriethoxysilane, 21 kg tetramethoxysilane, 1 kg silane coupling agent, 2 kg dimethyl silicone oil, 0.4 kg formic acid and 0.6 kg acetic acid;

[0037] Component C: 8 kg isopropanol and 2 kg leveling agent.

[0038] An application of the non-stick ceramic coating of the present invention in the preparation of non-stick cookware, the cookware including frying pans, woks, saucepans, rice cookers, ovens, and range hoods.

[0039] Preferably, the ceramic coating is sprayed onto the kitchenware using a pneumatic spraying method, with the coating thickness controlled to be 30-40 micrometers, and then baked at 280℃±50℃ for 15-30 minutes to obtain a long-term high-temperature resistant non-stick ceramic coating.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The biggest drawback of existing ceramic coatings is that their non-stick properties are not durable enough. With wear and tear at high temperatures or during cooking, or repeated washing with detergent, the number of methyl (-CH3) groups in the ceramic coating, which are provided by adding a small amount of silicone oil, will gradually decrease and be quickly depleted.

[0042] The tetramethyldiphenyldisiloxane added to the coating formulation of this invention provides a large number of methyl (-CH3) groups and phenyl groups. The methyl (-CH3) groups provide non-stick properties, and the phenyl groups provide heat resistance. The zirconium oxide and silicon carbide fillers in the formulation of this invention, when combined with different particle sizes, can improve the wear resistance of the coating. Increasing the amount of crosslinking components such as silane in the formulation of this invention can improve the density of the coating. Experimental verification shows that the ceramic coating obtained by this invention has excellent comprehensive non-stick properties, such as better high-temperature non-stick resistance, salt water non-stick resistance, detergent non-stick resistance, and wear-resistant non-stick resistance. Furthermore, the reaction conditions and preparation process of this invention are simple, environmentally friendly, and easy to mass-produce, thus having high application value. Detailed Implementation

[0043] The technical solution of the present invention will be further described in detail below through specific embodiments. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any modifications and / or alterations made to the present invention will fall within the protection scope of the present invention.

[0044] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0045] Unless otherwise specified, the reagents used in the following examples can be purchased from a regular biochemical reagent store.

[0046] The alkaline silica sol used in the examples was produced by Qingdao Fusang Refined Processing Co., Ltd., with a pH value of 9-11, a solid content of 29-31%, and a particle size range of 9-15 nm.

[0047] Dispersant BYK-2012 was purchased from BYK Chemical Technology Consulting (Shanghai) Co., Ltd.

[0048] Copper chromium black, purchased from Shanghai Jincheng New Materials Co., Ltd.;

[0049] Silane coupling agent KH560 was purchased from Hangzhou Jessica Chemical Co., Ltd.

[0050] The leveling agent BYK-333 was purchased from Shanghai Jincheng New Materials Co., Ltd.

[0051] The testing methods for various properties of ceramic non-stick coatings are as follows:

[0052] 1. The coating thickness test shall be performed in accordance with the test method in 6.2.3 of GB / T 32095.2-2015.

[0053] 2. The egg non-stick test shall be performed according to the test method in 4.2.1 of GB / T 32095.2-2015. The specific test method is as follows:

[0054] Clean the frying pan with warm water above 60℃ and add neutral detergent, then rinse it with clean water and dry it. Heat the frying pan to 150-170℃, crack the fresh egg and put it into the frying pan. After the protein has basically solidified, use a silicone spatula to remove the egg completely.

[0055] For evaluation methods, please refer to section 5.1.1 of GB / T 32095.2-2015.

[0056]

[0057] 3. High-Temperature Non-stick Coating Test Method: Place a frying pan in an oven preheated to 300℃ and leave for 1 hour. Then allow it to cool slowly at room temperature. After cleaning, perform an egg non-stick test to evaluate the non-stick properties. A non-stick performance of Grade II or higher is considered a completed cycle. Repeat the test until the non-stick performance can no longer reach Grade II. End the test and record the number of cycles.

[0058] 4. Saltwater Resistance Non-stick Test Method for Coating: Prepare a 5% salt solution using purified water, boil for 2 hours, then discard the solution. Perform an egg non-stick test to evaluate the non-stick properties. A non-stick performance of Grade II or higher is considered a completed cycle. Repeat the test until the non-stick performance can no longer reach Grade II. End the test and record the number of cycles.

[0059] 5. Detergent Resistance Non-stick Test Method for Coating: Prepare a 2% detergent powder solution using purified water, keep it at 80℃ for 1 hour, then discard the solution, rinse thoroughly with clean water, and then perform an egg non-stick test to evaluate the non-stick performance. A non-stick performance of Grade II or higher is considered a completed cycle. Repeat the test until the non-stick performance can no longer reach Grade II, then end the test and record the number of cycles.

[0060] 6. The abrasion resistance test of the coating shall be conducted in accordance with the test method 4.3.1 of GB / T 32095.2-2015. The specific test method is as follows: place the frying pan on the abrasion tester, set the frequency to 33 times / min, apply a downward force of 15N, and use a scouring pad (3M7447B) with a length of 70±5mm and a width of 30±5mm to move back and forth for 100mm as one friction cycle. Replace the scouring pad once every 500 friction cycles.

[0061] 7. Coating Abrasion Resistance and Non-stick Test Method: Place the frying pan on the abrasion tester, set the frequency to 33 times / min, apply a downward force of 15N, and use a scouring pad (3M 7447B) with a length of 70±5mm and a width of 30±5mm to move back and forth 100mm as one cycle of friction. After every 500 cycles of friction, clean the pan and perform an egg non-stick test to evaluate the non-stick performance. A non-stick performance of Grade II or above is considered a completed cycle. Replace the scouring pad and begin the next 500 cycles of friction, then clean the pan again and perform the egg non-stick test to evaluate the non-stick performance. Repeat this test until the non-stick performance can no longer reach Grade II, then end the test and record the number of cycles.

[0062] Examples 1-4

[0063] A method for preparing a non-stick ceramic coating, the specific steps of which are as follows:

[0064] 1. Preparation of components A, B, and C:

[0065] Preparation of Component A: The amounts of silica sol and tetramethyldiphenyldisiloxane shown in Table 1, along with 1 kg of dispersant BYK2012, 3 kg of silicon carbide, 9 kg of zirconium oxide, and 17 kg of copper chromium black, were sequentially added to a mixing container and stirred at 1000-2000 rpm for 30 min. The mixture was then ground to a fineness below 15 μm and filtered through a 300-mesh filter cloth to obtain Component A. The particle size of zirconium oxide is 5–15 μm, and the particle size of silicon carbide is 2–5 μm.

[0066] Preparation of component B: Mix 30 kg of methyltrimethoxysilane, 10 kg of methyltriethoxysilane, 16 kg of tetramethoxysilane, 1 kg of silane coupling agent, 2 kg of dimethyl silicone oil, 0.4 kg of formic acid and 0.6 kg of acetic acid until homogeneous to obtain component B.

[0067] Preparation of component C: Mix 8 kg of isopropanol and 2 kg of leveling agent BYK-333 evenly to obtain component C.

[0068] The formulation dosages for each embodiment are shown in Table 1.

[0069] 2. Preparation of ceramic coating: Mix components A and B (weight ratio of 5:3) according to the formula. At room temperature, stir using a high-speed disperser at 1200-1500 rpm for 6 hours to allow for complete hydrolysis of the silane and moderate cross-linking and maturation with the silica sol. Before use, add component C to the AB mixture and stir until homogeneous to obtain a non-stick ceramic coating. The amount of component C added is 10% of the weight of component A.

[0070] 3. Preparation of ceramic coating: The prepared ceramic coating is sprayed onto the pan using a pneumatic spraying method, and the coating thickness is controlled to be 30-40 micrometers. Then, it is baked at 280℃ for 15 minutes to obtain a non-stick ceramic coating.

[0071] Comparative Example 1

[0072] Component A contains 70 kg of silica sol, without the addition of tetramethyldiphenyldisiloxane, and the amounts of other components and the preparation method are the same as in Examples 1-4.

[0073] Table 1 Raw Material Proportions

[0074]

[0075] The ceramic coatings prepared in Examples 1-4 and Comparative Example 1 were subjected to relevant performance tests, and the test results are shown in Table 2.

[0076] Table 2 shows the performance indicators of the ceramic coatings obtained in Examples 1-4 and Comparative Example 1.

[0077] performance Film thickness High temperature resistant non-stick Salt water resistant non-stick Detergent resistant and non-stick Wear-resistant and non-stick Comparative Example 1 35-40μm 37 cycles 15 cycles 17 cycles 9 cycles Example 1 35-40μm 48 cycles 12 cycles 18 cycles 11 cycles Example 2 35-40μm 57 cycles 10 cycles 20 cycles 11 cycles Example 3 35-40μm 55 cycles 8 cycles 20 cycles 10 cycles Example 4 35-40μm 51 cycles 5 cycles 19 cycles 8 cycles

[0078] As shown in Table 2, compared with Comparative Example 1, the high-temperature non-stick properties of the ceramic coating in Examples 1-4 are significantly improved. This is because tetramethyldiphenyldisiloxane introduces a large number of methyl (-CH3) and phenyl groups. However, the salt water non-stick properties of the ceramic coating are significantly reduced. Analysis suggests this may be because the dimethylphenylsilanol generated from the hydrolysis of tetramethyldiphenyldisiloxane has only one hydroxyl group (-OH). In this polymerization reaction, besides providing a large number of methyl (-CH3) and phenyl groups, it also plays a certain role in end-capping the polymerization reaction, resulting in insufficient cross-linking strength and a less dense coating, thus reducing the salt water non-stick properties.

[0079] Examples 5-8

[0080] Based on the above embodiments, the formulation of component B was redesigned to increase the amount of silane that plays a cross-linking role in component B.

[0081] A method for preparing a non-stick ceramic coating, the specific steps of which are as follows:

[0082] 1. Preparation of components A, B, and C:

[0083] Preparation of Component A: The amounts of silica sol and tetramethyldiphenyldisiloxane shown in Table 3, along with 1 kg of dispersant BYK2012, 3 kg of silicon carbide, 9 kg of zirconium oxide, and 17 kg of copper chromium black, were sequentially added to a mixing container and stirred at 1000-2000 rpm for 30 min. The mixture was then ground to a fineness below 15 μm and filtered through a 300-mesh filter cloth to obtain Component A. The particle size of zirconium oxide is 5–15 μm, and the particle size of silicon carbide is 2–5 μm.

[0084] Preparation of Component B: Mix 40 kg of methyltrimethoxysilane, 15 kg of methyltriethoxysilane, 21 kg of tetramethoxysilane, 1 kg of silane coupling agent, 2 kg of dimethyl silicone oil, 0.4 kg of formic acid and 0.6 kg of acetic acid until homogeneous to obtain Component B.

[0085] Preparation of component C: Mix 8 kg of isopropanol and 2 kg of leveling agent BYK-333 evenly to obtain component C.

[0086] The formulation dosages for each embodiment are shown in Table 3.

[0087] 2. Preparation of ceramic coating: Mix components A and B (weight ratio of 5:4) according to the formula. At room temperature, stir using a high-speed disperser at 1200-1500 rpm for 6 hours to allow for complete hydrolysis of the silane and moderate cross-linking and maturation with the silica sol. Before use, add component C to the AB mixture and stir until homogeneous to obtain a non-stick ceramic coating. The amount of component C added is 10% of the weight of component A.

[0088] 3. Preparation of ceramic coating: The prepared ceramic coating is sprayed onto the pan using a pneumatic spraying method, and the coating thickness is controlled to be 30-40 micrometers. Then, it is baked at 280℃ for 15 minutes to obtain a non-stick ceramic coating.

[0089] Comparative Example 2

[0090] The preparation method is the same as Comparative Example 5, and components A and C are also the same as in Comparative Example 5. The only difference is the amount of siloxane in component B. Preparation of component B: Mix 40 kg of methyltrimethoxysilane, 15 kg of methyltriethoxysilane, 21 kg of tetramethoxysilane, 1 kg of silane coupling agent, 2 kg of dimethyl silicone oil, 0.4 kg of formic acid, and 0.6 kg of acetic acid until homogeneous to obtain component B. The formulation and dosage of Comparative Example 2 are shown in Table 3.

[0091] Table 3 Raw material ratio

[0092]

[0093]

[0094] The ceramic coatings prepared in Examples 5-8 and Comparative Example 2 were subjected to relevant performance tests, and the test results are shown in Table 4.

[0095] Table 4 shows the performance indicators of the ceramic coatings obtained in Examples 5-8 and Comparative Example 2.

[0096] performance Film thickness High temperature resistant non-stick Salt water resistant non-stick Detergent resistant and non-stick Wear-resistant and non-stick Comparative Example 2 35-40μm 37 cycles 17 cycles 17 cycles 9 cycles Example 5 35-40μm 52 loops 20 cycles 21 cycles 12 cycles Example 6 35-40μm 61 cycles 25 cycles 27 cycles 14 cycles Example 7 35-40μm 60 cycles 22 cycles 26 cycles 14 cycles Example 8 35-40μm 59 cycles 19 cycles 20 cycles 11 cycles

[0097] As shown in Table 4, compared with Examples 1-4 in Table 2, by increasing the amount of silane that plays a cross-linking role in component B, the ceramic coating in Examples 5-8 overcomes the problem of poor salt water resistance and non-stick properties while maintaining high-temperature resistance and non-stick properties, and the salt water resistance and non-stick properties are significantly improved. In addition, the detergent resistance and abrasion resistance of the ceramic coating are also significantly improved. Compared with Comparative Example 2, Examples 5-8 show significant improvements in high-temperature resistance, salt water resistance, detergent resistance, and abrasion resistance of the ceramic coating.

[0098] This invention introduces a large amount of methyl (-CH3) and phenyl groups into the ceramic coating by adding tetramethyldiphenyldisiloxane to component A, thereby increasing the methyl (-CH3) content and phenyl content on the surface of the ceramic coating and thus greatly improving the temperature resistance and non-stick properties of the ceramic coating.

[0099] This invention significantly improves the wear resistance of ceramic coatings by adding zirconium oxide and silicon carbide fillers with different particle sizes to component B.

[0100] This invention significantly improves the density of the ceramic coating by increasing the amount of silane that plays a crosslinking role in component B, thereby enhancing the coating's resistance to salt water.

[0101] Testing revealed that the final ceramic coating exhibits excellent overall non-stick properties, including high-temperature resistance, salt water resistance, detergent resistance, and wear resistance. Both its non-stick performance and durability are also very good.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0103] The foregoing has provided a detailed description of the non-stick ceramic coating, its preparation method, and its applications provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A non-stick ceramic coating, characterized in that: The ceramic coating is made of three components, A, B, and C, in a weight ratio of 100:80:6 to 16. (Based on parts by weight) Component A is prepared by mixing and dispersing the following raw materials: The raw materials of component A consist of 40-69 parts silica sol, 10-14 parts tetramethyldiphenyldisiloxane, 10-29 parts filler, 0-30 parts heat-resistant pigment, 0-30 parts water, and 0-5 parts dispersant, totaling 100 parts by weight. The filler is a combination of zirconium oxide and silicon carbide in a mass ratio of 2-3:1, with zirconium oxide having a particle size of 5-15 μm and silicon carbide having a particle size of 2-5 μm. Component B is a mixture of the following raw materials: 76 parts silane, 0-10 parts silane coupling agent, 1-10 parts silicone oil, and 0-5 parts catalyst, totaling 80 parts by weight; the silane is 40 parts methyltrimethoxysilane, 15 parts methyltriethoxysilane, and 21 parts tetramethoxysilane; the silane coupling agent is one or more of γ-(2,3-epoxypropane)propyltrimethoxysilane, γ-(2,3-epoxypropane)propyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ-aminopropyltriethoxysilane. Component C is composed of the following raw materials: 0-15 parts solvent, 0-10 parts leveling agent, 0-5 parts defoamer, and the total weight of the raw materials in Component C is 6-16 parts. The preparation method of this non-stick ceramic coating includes the following steps: S1. Mix the raw materials of component A according to the formula, grind them to a fineness of 15μm under a high-speed grinding and dispersing machine, and filter to obtain component A; S2, component A and component B are mixed and rolled at 10-30℃ for 4-10 hours at a speed of 1000rpm to 1600rpm. After curing, component C is added according to the formula amount and stirred evenly to obtain a non-stick ceramic coating for spraying.

2. The non-stick ceramic coating according to claim 1, characterized in that: The silica sol is an alkaline silica sol with a solid mass fraction of 15%-40% and a particle size of 5-50 nm.

3. The non-stick ceramic coating according to claim 1, characterized in that: The filler includes one or a combination of several of the following: mica, zirconium oxide, talc, silicon carbide, alumina powder, whisker silicon, silica, barite, silica fume or glass flakes. The pigment is one or a combination of several of the following: titanium dioxide, iron oxide black, carbon black, copper chromium black, manganese iron black, iron oxide yellow, titanium yellow, bismuth yellow, iron oxide red, cobalt blue, phthalocyanine blue, phthalocyanine green, cobalt green, metallic pigments, iron oxide green, or pearlescent pigments. The dispersant is an aqueous dispersant, the defoamer is an aqueous defoamer, and the leveling agent is an aqueous leveling agent.

4. The non-stick ceramic coating according to claim 1, characterized in that: In component B, The silicone oil mentioned is one or more of dimethyl silicone oil, hydroxyl silicone oil, hydrogen-containing silicone oil, phenolic hydroxyl silicone oil, amino silicone oil, alcoholic hydroxyl silicone oil, and mercapto silicone oil; The catalyst is one or more of formic acid, acetic acid, propionic acid, hydrochloric acid, and citric acid.

5. A method for preparing the non-stick ceramic coating according to claim 1, characterized in that... The method includes the following steps: S1. Mix the raw materials of component A according to the formula, grind them to a fineness of 15μm under a high-speed grinding and dispersing machine, and filter to obtain component A; S2, component A and component B are mixed and rolled at 10-30℃ for 4-10 hours at a speed of 1000rpm to 1600rpm. After curing, component C is added according to the formula amount and stirred evenly to obtain a non-stick ceramic coating for spraying.

6. The application of the non-stick ceramic coating of claim 1 in the preparation of non-stick cookware, the cookware including frying pans, woks, saucepans, rice cookers, ovens, and range hoods.

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