Matt ceramic coating and preparation method thereof

Abstract

The invention belongs to the technical field of ceramic coatings, and relates to a matte ceramic coating and a preparation method thereof. The preparation method of the matte ceramic coating comprises the following steps that S1, a component B containing siloxane and a component C serving as a chemical delustering agent and a catalyst are mixed, the weight ratio of the component B to the component C is 100: 2-100: 8, and the component C is polyacrylic acid; s2, a component A containing silica sol is added into the BC mixed component obtained in the S1 to be fully mixed, and rolling curing is conducted for 6-12 h at the rotating speed of 1000-1600 rpm; and S3, adding a component D containing a solvent into the A, B and C mixed component obtained in the S2, and uniformly mixing for spraying. The coating prepared by the method can meet stable low glossiness and excellent non-stick performance at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic coatings and relates to a matte ceramic coating and a preparation method thereof. Background Art

[0002] Ceramic coatings are produced through a sol-gel process by combining inorganic silica particles in a silica sol with organic siloxanes through a series of condensation reactions, resulting in an inorganic coating with a Si-O-Si cross-linked structure similar to ceramic or glass. High gloss is one of the key characteristics of ceramic coatings. However, achieving a matte finish is challenging, and achieving a matte finish while maintaining the coating's release properties is even more challenging. Currently, two common matting techniques are used on the market. One involves adding a matting agent, such as fumed silica, to disrupt specular reflection by scattering light. The other involves adding a matting agent, such as a wax-based matting agent, to reduce gloss by creating a micro-rough surface. While both techniques share a common characteristic: while achieving a certain matting effect, the gloss can still be somewhat high and unstable, making it difficult to control, with gloss levels fluctuating. In particular, gloss levels can vary significantly with film thickness, and storage time can also lead to significant variations in coating gloss.

[0003] The biggest drawbacks of existing matte ceramic coatings are either unstable gloss, resulting in low pass rates, or poor release properties. Using a single layer of matting powder for matting provides good release properties, but the glossiness of the topcoat is difficult to control, resulting in unstable overall glossiness, fluctuating between high and low, leading to a low pass rate. Using a double layer of matting powder for matting simultaneously mattes both the basecoat and topcoat, resulting in a more stable gloss. However, matting powder achieves its effect by increasing roughness, increasing refraction, and reducing reflection. Therefore, adding matting powder to the topcoat inevitably impacts the release properties of the coating, leading to poor release properties.

[0004] CN117866464A discloses a matte ceramic coating and its preparation method. The method utilizes a double-layer matte process, adding matting powder to both the base coat and the top coat of the ceramic coating. This method can produce a relatively low-gloss, matte ceramic coating with good gloss stability. However, the matting powder increases the micro-roughness of the coating surface, significantly impacting the coating's non-stick properties. This method achieves a matte effect at the expense of the coating's non-stick properties. However, if non-stick properties, the most important performance and biggest selling point of ceramic coatings, are significantly reduced or eliminated, their use in non-stick applications will be limited. Summary of the Invention

[0005] The object of the present invention is to overcome the above-mentioned defects of the prior art and provide a method for preparing a matte ceramic coating, wherein the coating prepared by the method can simultaneously meet the requirements of stable low gloss and excellent non-stick performance.

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

[0007] A method for preparing a matte ceramic coating, the method comprising the following steps:

[0008] S1. Mixing component B containing siloxane and component C serving as a chemical matting agent and catalyst, wherein the weight ratio of component B to component C is 100:2 to 100:8, and component C is polyacrylic acid; S2. Thoroughly mixing component A containing silica sol and the BC mixed component obtained in S1, rolling and aging at a speed of 1000-1600 rpm for 6-12 hours, wherein the amount of component A is calculated based on a weight ratio of component A to component B of 100:40-80;

[0009] S3. Add component D containing a solvent to the ABC mixed component obtained in S2. After mixing evenly, the mixture can be sprayed for use. The amount of component D is added at a ratio of 2% to 10% of the total weight of the ABC mixed component after maturation.

[0010] The core technical concept of this invention lies in the creative introduction of polyacrylic acid as a reactive component, which can not only act as a chemical matting agent, but also as a reaction catalyst. Its mechanism of action is that the carboxyl groups on polyacrylic acid can catalyze the hydrolysis of siloxane to form silanols (such as Figure 1 Then, the polyacrylic acid molecular chain undergoes condensation reaction with silanol and hydroxyl groups on the surface of silica sol through its active groups (as shown in Figure 2 (As shown), polypropylene groups with light-absorbing properties are evenly "grafted" onto the Si-O-Si inorganic network skeleton through chemical bonding, achieving matte without increasing surface roughness. By precisely controlling the amount of polyacrylic acid used, the majority of its active groups are ensured to participate in the reaction, preventing excess hydrophilic groups from remaining and affecting non-stick properties.

[0011] Preferably, the component A is prepared by mixing and dispersing the following raw materials in an amount of 100% by mass: 30-79% silica sol, 10-29% filler, 0-30% heat-resistant pigment, 0-20% deionized water, and 0-5% dispersant.

[0012] Preferably, the formula of component A of the ceramic coating is: 48-70% silica sol, 10-20 parts filler, 15-20% heat-resistant pigment, 0-10% deionized water, 0-2% dispersant, and the total mass of all raw material components is 100%.

[0013] Preferably, the preparation process of component A is as follows: after mixing the raw materials of component A according to the ratio, grinding them in a high-speed grinding and dispersing machine to a fineness of less than 20 μm, and filtering them through a 300-mesh filter cloth.

[0014] Preferably, the molecular weight of the polyacrylic acid is 2000-5000.

[0015] Preferably, the B component is formed by mixing the following raw materials, calculated as 100% by mass percentage: 90-99% siloxane and 1-10% silicone oil; the D component is formed by mixing the following raw materials, calculated as 100% by mass percentage: 72-90% solvent, 5-19% leveling agent, and 0-9% defoaming agent; the solvent is one or more of isopropyl alcohol, ethanol, ethylene glycol ethyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether.

[0016] Preferably, the siloxane is one or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, phenyltrimethoxysilane, methylphenyldimethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane;

[0017] The silica sol is alkaline silica sol, the solid mass fraction of the silica sol is 30%-50%, and the particle size is 40-80nm;

[0018] The filler includes one or more of alumina, silicon carbide, ceramic powder, wear-resistant powder, mica, silicon nitride, zirconium oxide, talc, silicon whisker, white carbon black, barite, kaolin, silica powder, and glass flakes;

[0019] The heat-resistant pigment is selected from one or more of titanium dioxide, iron chrome black, iron oxide black, carbon black, copper chrome black, manganese iron black, titanium nickel yellow, iron oxide yellow, titanium chrome brown, phthalocyanine blue, phthalocyanine green, titanium yellow, bismuth yellow, iron oxide red, cadmium red, cobalt blue, cobalt green, iron oxide green, pearlescent pigments, and metallic pigments;

[0020] The dispersant is a water-based dispersant, the defoamer is a water-based defoamer, and the leveling agent is a water-based leveling agent;

[0021] The silicone oil is one or more of dimethyl silicone oil, hydroxy silicone oil, hydrogen silicone oil, phenolic hydroxy silicone oil, amino silicone oil, alcoholic hydroxy silicone oil and mercapto silicone oil.

[0022] Preferably, the weight ratio of component B to component C is 100:4 to 100:6. Under the preferred weight ratio conditions, the ceramic coating can achieve a relatively low gloss and still have relatively good non-stick properties.

[0023] Preferably, the amount of component A is calculated based on a weight ratio of 100:50 to 75. Component A provides the inorganic framework and filler, while component B provides the primary film-forming agent. This ratio ensures an appropriate combination of the inorganic and organic phases in the system. Adjusting this ratio can further adjust the coating's density, hardness, toughness, and wear resistance.

[0024] Component D is preferably added at a ratio of 5% to 8% of the total weight of the cured ABC mixture. Component D primarily serves as a solvent and additive, adjusting the coating's application viscosity and final leveling properties. Too little can impair leveling and easily cause craters and orange peel effects; too much can affect coating performance and gloss. A range of 5% to 8% is the proven optimal application window, ensuring a smooth, defect-free coating surface.

[0025] Preferably, the rolling aging in S2 has a rolling speed of 1200 rpm to 1500 rpm and an aging temperature of 10-30°C.

[0026] A matte ceramic coating prepared by the method of the present invention.

[0027] Preferably, the coating formed by curing the matte ceramic coating has a glossiness of less than 20°, and its non-stickiness can reach level II or above when subjected to an egg non-stick test according to GB / T 32095.2-2015 standard.

[0028] Furthermore, the coating formed by curing the matte ceramic paint has a glossiness lower than 10°.

[0029] Preferably, the polyacrylic acid is distributed in the Si-O-Si network structure formed by siloxane and silica sol in a chemically bonded manner, thereby giving the coating a glossiness below 20° and, after multiple tests, its non-stickiness can still reach level II or above.

[0030] The present invention discloses a use of the matte ceramic coating in the preparation of non-stick kitchenware, including frying pans, woks, soup pots, rice cookers, ovens, and range hoods.

[0031] The beneficial effects of the present invention are:

[0032] The present invention successfully achieves a stable deep matte effect as low as 10° or less while maintaining excellent non-stick performance for the first time through the method of chemical matting, breaking the technical bottleneck in the industry that "matte" and "non-stick" cannot be achieved at the same time.

[0033] The polyacrylic acid introduced in this invention not only acts as a chemical matting agent but also replaces traditional acid catalysts, catalyzing the reaction, simplifying the coating formulation and reducing costs and process complexity. Because the matting groups are uniformly distributed throughout the coating network through chemical bonding rather than physical mixing, the resulting coating exhibits extremely stable gloss, unaffected by storage time or application conditions, significantly improving product yield.

[0034] The reaction conditions of the present invention are mild, aging can be completed at room temperature, the preparation process is simple, and large-scale industrial production is easy. In addition, no highly corrosive catalyst is used, and the present invention is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the reaction mechanism diagram of silanols obtained by hydrolysis of siloxanes;

[0036] Figure 2 This is a diagram showing the mechanism of the coating formed by the condensation and dehydration reaction between polyacrylic acid, silica sol and silanol;

[0037] Figure 3 This is a photo of the failed material obtained in Example 1;

[0038] Figure 4 These are photos of glossiness testing of the ceramic coatings prepared in Examples 2-5 and Comparative Example 1. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described in detail below through specific examples. It should be understood that the implementation of the present invention is not limited to the following examples, and any form of modification and / or change made to the present invention will fall within the scope of protection of the present invention.

[0040] In the present 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. The methods in the following examples are all conventional methods in the art unless otherwise specified.

[0041] Unless otherwise specified, the reagents used in the following examples can be purchased from conventional biochemical reagent stores.

[0042] The polyacrylic acid used in the examples was purchased from Hunan Darun Chemical Co., Ltd. and had a molecular weight of 2000-5000;

[0043] The alkaline silica sol is produced by Shandong Better New Materials Co., Ltd., with a pH value of 9-11, a solid content of 35-37%, and a particle size range of 30-40 nm;

[0044] Dispersant BYK-ET3032 was purchased from BYK Chemical Technology Consulting (Shanghai) Co., Ltd.

[0045] Copper chromium black was purchased from Shanghai Jincheng New Materials Co., Ltd.

[0046] Leveling agent BYK-333, purchased from BYK Chemical Technology Consulting (Shanghai) Co., Ltd.;

[0047] Defoamer TEGO 902W was purchased from Bodi Shanghai Trading Co., Ltd.

[0048] Wear-resistant powder, Hebei Yuechao Wear-resistant Materials Co., Ltd.;

[0049] The performance testing methods for ceramic non-stick coatings are as follows:

[0050] 1. The coating thickness test shall refer to the test method in 6.2.3 of GB / T 32095.2-2015.

[0051] 2. Coating adhesion: Use a grid knife to measure according to the method of GB / T9286-1998;

[0052] 3. The coating glossiness shall refer to the test method specified in GB / T 9754:

[0053] 4. The egg non-stick test refers to the test method in 4.2.1 of GB / T 32095.2-2015. The specific test method is:

[0054] Clean the frying pan with warm water above 60°C and a neutral detergent, then rinse thoroughly with clean water and dry. Raise the pan temperature to 150-170°C, crack a fresh egg, and place it in the pan. Once the protein has solidified, remove the egg intact using a silicone spatula. Continue frying the eggs in this manner and evaluate the non-stickiness. A cycle is considered complete when the non-stickiness reaches Level II or higher. The test ends when the non-stickiness no longer meets Level II, and the number of eggs fried is recorded.

[0055] For the evaluation method, see 5.1.1 of GB / T 32095.2-2015.

[0056] Serial number Evaluation requirements Evaluation level 1 Use a silicone spatula to remove eggs without damaging them and leaving no residue Level I 2 Using a silicone spatula will not remove the egg without damage, but gently wiping with a damp sponge or rag will remove any residue. Level II 3 Wiping with a damp sponge or rag will not remove the residue Level III

[0057] 5. The boiling milk non-stick test refers to PFL-CTS-01. The specific test method is:

[0058] Put 20ml of milk in the sample pot, turn on the gas stove and boil the milk over medium-low heat until it becomes brown and burnt. Rinse the sample pot with tap water. If it can be rinsed up or a large area can be rinsed up, and a small part can be wiped off with a sponge, it is one cycle. If the sponge cannot wipe it off, record the number of times the milk is boiled.

[0059] This invention introduces polyacrylic acid into a conventional ceramic coating system. The polyacrylic acid crosslinks and solidifies with siloxane and the hydroxyl-bearing silica particles in the silica sol. The resulting surface is uniformly distributed with a large number of polypropylene groups, which absorb light with little reflection, thus achieving a matte finish. Furthermore, the polyacrylic acid acts as a catalyst in the ceramic coating system, catalyzing the crosslinking and curing of the ceramic coating without the need for additional catalysts. Finally, by controlling the amount of polyacrylic acid, the problem of reduced coating release due to an excess of polyacrylic acid, i.e., an excess of hydrophilic groups such as carboxyl groups, is avoided.

[0060] In the present invention, on the one hand, polyacrylic acid reacts chemically with siloxane and silica sol, thereby uniformly distributing the polypropylene group in the coating. The characteristic of the polypropylene group is that it can absorb light, which is also the principle of using polyacrylic acid for matting. Therefore, the matting stability of this chemical method is good, the gloss is stable, and the qualified rate is high. Secondly, polyacrylic acid is matted by absorbing light by the polypropylene group rather than by increasing roughness, so the non-stick property is not greatly affected. Thirdly, by controlling the amount of polyacrylic acid added, it is possible to avoid excessive active groups affecting the non-stick property of the coating.

[0061] Examples 1-5

[0062] A method for preparing a matte ceramic coating, the specific steps are as follows:

[0063] 1. Preparation of components A, B, C and D:

[0064] Preparation of component A: 67 kg of silica sol, 14 kg of filler (4 kg of wear-resistant powder, 3 kg of alumina, 5 kg of barite, 2 kg of mica), 1 kg of dispersant BYK-ET3032, and 18 kg of heat-resistant pigment (3 kg of titanium dioxide, 15 kg of copper chrome black) were added to a stirring container in sequence, stirred and dispersed at a speed of 1000-1600 rpm for 30 minutes, and then ground in a grinder to a fineness of less than 20 μm, and filtered through a 300-mesh filter cloth to obtain component A.

[0065] Preparation of component B: Mix 55 kg of methyltrimethoxysilane, 14 kg of phenyltrimethoxysilane, and 3 kg of dimethyl silicone oil and stir evenly to obtain component B;

[0066] Component C: Take different amounts of polyacrylic acid, see Table 1 for details;

[0067] Preparation of component D: Mix 8 kg of isopropyl alcohol, 1 kg of leveling agent BYK-333, and 1 kg of defoaming agent TEGO 902W evenly to prepare component D.

[0068] The dosage of each embodiment is shown in Table 1.

[0069] 2. Preparation of Ceramic Coating: Mix components B and C. Mix components A and B / C. Stir in a high-speed disperser at room temperature at 1400 rpm for 10 hours to allow for complete hydrolysis, polycondensation, crosslinking, and maturation of the siloxane, silica sol, and polyacrylic acid. Before use, add component D to the A / B / C mixture and stir thoroughly to obtain a matte ceramic coating.

[0070] 3. Preparation of ceramic coating: The prepared ceramic coating was sprayed onto the pan by pneumatic spraying, with the coating thickness controlled to be 36-50 μm, and then baked at 280° C. for 10 min to obtain a matte non-stick ceramic coating.

[0071] Comparative Example 1

[0072] Except that the polyacrylic acid in component C was replaced with 2 kg of formic acid, the addition amounts of other components and the preparation method were the same as those in Example 1-5.

[0073] Table 1 Raw material ratio

[0074] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Component A 100 kg 100 kg 100 kg 100 kg 100 kg 100 kg Component B 72kg 72kg 72kg 72kg 72kg 72kg C component 1kg polyacrylic acid 2kg polyacrylic acid 3kg polyacrylic acid 4kg polyacrylic acid 5kg polyacrylic acid 2kg formic acid D component 10 kg 10 kg 10 kg 10 kg 10 kg 10 kg

[0075] In the above test, Example 1 was scrapped because too little polyacrylic acid was added during the mixing and curing process of the coating components, resulting in gel formation. The ceramic coatings prepared in Examples 1-5 and Comparative Example 1 were tested for relevant properties, and the test results are shown in Table 2. Figure 3 This is a photo of the failed material obtained in Example 1; Figure 4 These are photos of glossiness testing of the ceramic coatings prepared in Examples 2-5 and Comparative Example 1.

[0076] Table 2 Performance indicators of the ceramic coatings obtained in Examples 1-5 and Comparative Example 1

[0077] performance Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Gloss ° / 15-20 6-10 3-7 1-3 55-65 Film thickness (um) / 35-40 35-40 35-40 35-40 35-40 Adhesion / Level 1 Level 1 Level 1 Level 1 Level 1 Non-stick eggs / 74 72 61 36 77 No milk / 79 cycles 78 cycles 63 cycles 37 cycles 82 cycles Glossiness (after aging, leave it for 24 hours before spraying again) / 13-19 6-10 3-6 1-3 53-62

[0078] As shown in Table 2, Comparative Example 1 is a conventional ceramic coating with a high gloss of approximately 60° and relatively good non-stick properties. In Examples 2-5, the addition of polyacrylic acid significantly reduces the coating's gloss. Only when the polyacrylic acid addition reaches a certain level can the coating achieve a matte gloss, as in Examples 3-5 (gloss below 10°). Furthermore, as the amount of polyacrylic acid added increases, the coating's non-stick properties actually deteriorate. This also shows that polyacrylic acid can replace formic acid as a catalyst, eliminating the need for a separate catalyst. Compared to the conventional ceramic coating in Comparative Example 1, Examples 4-5 exhibit significantly lower non-stick properties, demonstrating that excessive amounts of polyacrylic acid, while achieving a matte finish, significantly impact the coating's non-stick properties.

[0079] As can be seen from Example 2, when the amount of polyacrylic acid added is relatively low, the coating's non-stick properties remain relatively good and are barely affected. It also exhibits a certain matte effect, but the glossiness is still high and does not fully achieve a matte finish. As can be seen from Example 3, when the amount of polyacrylic acid added is moderate, the coating not only achieves a matte finish but also maintains its non-stick properties. Examples 2-5 also show that the glossiness of the coating after aging for 24 hours and then spraying it again is almost identical to that of the coating sprayed directly after aging, demonstrating that the matte effect achieved by adding polyacrylic acid to the coating is relatively stable.

[0080] Specifically, when the B:C ratio was 100:2.78 (Example 2), gloss decreased (15-20°), but the desired deep matte effect was still not achieved. When the ratio was increased to 100:6.94 (Example 5), gloss was extremely low (1-3°), but non-stickiness began to decline significantly (36 fried eggs). However, at a ratio of 100:4.17 (Example 3), an optimal balance between gloss (6-10°) and non-stickiness (72 fried eggs) was achieved. At a ratio of 100:5.56 (Example 4), both gloss (3-7°) and non-stickiness (61 fried eggs) were achieved, demonstrating excellent performance. Therefore, a weight ratio of component B to component C of 100:4 to 100:6 is preferred to ensure that the resulting coating possesses a deep matte texture while retaining excellent non-stick properties to the greatest extent possible.

[0081] In summary, the present invention produces a ceramic coating containing a polypropylene radical by adding polyacrylic acid to an ordinary ceramic coating. Because the polypropylene radical has the property of absorbing light, the resulting coating is a matte coating. Furthermore, because the polypropylene radical is uniformly distributed throughout the coating through a chemical reaction, the coating's gloss is very stable. By controlling the amount of polyacrylic acid added, a matte finish can be achieved without affecting the coating's non-stick properties. If the amount of polyacrylic acid added is small, all the active groups on the polyacrylic acid are fully reacted, so the non-stick properties are not affected. However, because the number and density of the polypropylene radicals are not large enough, complete matting cannot be achieved, only partial matting can be achieved, and the coating's gloss will still be slightly high. If the amount of polyacrylic acid added is large, the number and density of the polypropylene radicals are large enough, so complete matting can be achieved. However, due to the large amount of polyacrylic acid, many incompletely reacted active groups remain, resulting in poor non-stick properties.

[0082] In general, the present invention prepares a matte ceramic coating by adding polyacrylic acid to an ordinary ceramic coating, and by controlling the amount of polyacrylic acid added, a matte ceramic coating with good matting effect, good non-stick properties and stable gloss is prepared.

Claims

1. A method for preparing a matte ceramic coating, characterized in that: The method comprises the following steps: S1. Mixing component B containing siloxane and component C serving as a chemical matting agent and catalyst, wherein the weight ratio of component B to component C is 100:2 to 100:8, and component C is polyacrylic acid; S2. Thoroughly mixing component A containing silica sol and the BC mixed component obtained in S1, rolling and aging at a speed of 1000-1600 rpm for 6-12 hours, wherein the amount of component A is calculated based on a weight ratio of component A to component B of 100:40-80; S3. Add component D containing a solvent to the ABC mixed component obtained in S2. After mixing evenly, the mixture can be sprayed for use. The amount of component D is added at a ratio of 2% to 10% of the total weight of the ABC mixed component after maturation.

2. The preparation method according to claim 1, wherein: The component A is prepared by mixing and dispersing the following raw materials in 100% by mass: 30-79% silica sol, 10-29% filler, 0-30% heat-resistant pigment, 0-20% deionized water, and 0-5% dispersant.

3. The preparation method according to claim 1, wherein: The molecular weight of the polyacrylic acid is 2000-5000.

4. The preparation method according to claim 1, wherein: Based on the mass percentage of 100%, the B component is mixed with the following raw materials: 90-99% of siloxane and 1-10% of silicone oil; The D component is formed by mixing the following raw materials based on 100% by mass: 72-90% solvent, 5-19% leveling agent, and 0-9% defoaming agent; the solvent is one or more of isopropyl alcohol, ethanol, ethylene glycol ethyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether.

5. The preparation method according to claim 1, wherein: The siloxane is one or more of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, phenyltrimethoxysilane, methylphenyldimethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane; The silica sol is alkaline silica sol, the solid mass fraction of the silica sol is 30%-50%, and the particle size is 40-80nm; The filler includes one or more of alumina, silicon carbide, ceramic powder, wear-resistant powder, mica, silicon nitride, zirconium oxide, talc, silicon whisker, white carbon black, barite, kaolin, silica powder, and glass flakes; The heat-resistant pigment is selected from one or more of titanium dioxide, iron chrome black, iron oxide black, carbon black, copper chrome black, manganese iron black, titanium nickel yellow, iron oxide yellow, titanium chrome brown, phthalocyanine blue, phthalocyanine green, titanium yellow, bismuth yellow, iron oxide red, cadmium red, cobalt blue, cobalt green, iron oxide green, pearlescent pigments, and metallic pigments; The dispersant is a water-based dispersant, the defoamer is a water-based defoamer, and the leveling agent is a water-based leveling agent; The silicone oil is one or more of dimethyl silicone oil, hydroxy silicone oil, hydrogen silicone oil, phenolic hydroxy silicone oil, amino silicone oil, alcoholic hydroxy silicone oil and mercapto silicone oil.

6. The preparation method according to claim 1, wherein: The weight ratio of the B component to the C component is 100:4 to 100:

6.

7. A matte ceramic coating prepared by the method according to any one of claims 1 to 6.

8. The matte ceramic coating according to claim 7, characterized in that: The matte ceramic coating formed after curing has a glossiness of less than 20°, and its non-stickiness can reach level II or above when subjected to an egg non-stick test according to the GB / T 32095.2-2015 standard.

9. The matte ceramic coating according to claim 7, characterized in that: The polyacrylic acid is distributed in the Si-O-Si network structure formed by siloxane and silica sol in a chemically bonded manner.

10. Use of the matte ceramic coating according to claim 7 in the preparation of non-stick cookware.

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