High-hardness scratch-resistant wear-resistant coating for kitchen ware and preparation method of high-hardness scratch-resistant wear-resistant coating

Abstract

The invention relates to the technical field of coatings, and discloses a high-hardness scratch-resistant wear-resistant coating for kitchenware and a preparation method thereof.The high-hardness scratch-resistant wear-resistant coating is obtained by taking polytetrafluoroethylene and organic silicon resin as a resin matrix of paint and silicon carbide micro powder and the like as filler and adding fluorosilicone polyether sulphone resin. The side chain of the fluorosilicone polyether sulphone resin contains a fluorine group, so that the solubility parameter of the polyether sulphone resin in polytetrafluoroethylene is improved, the compatibility of the polyether sulphone resin and the polytetrafluoroethylene is improved, and meanwhile, a siloxane structural unit which is the same as that of organic silicon resin is introduced into the main chain of the polyether sulphone resin; the fluorine-silicon polyether sulphone resin is added into the organic silicon resin, so that the fluorine-silicon polyether sulphone resin has better interfacial compatibility with the polytetrafluoroethylene and the organic silicon resin, the Vickers hardness and the impact resistance of a coating are improved, the friction coefficient and the wear quality are reduced, the scratch resistance and the wear resistance of the coating are improved, and the fluorine-silicon polyether sulphone resin has a wide application prospect in the aspects of kitchen ware and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and specifically to a high-hardness scratch-resistant and wear-resistant coating for kitchen utensils and a preparation method thereof. Background Art

[0002] Polytetrafluoroethylene has excellent high and low temperature resistance, anti-aging performance, acid and alkali resistance, and corrosion resistance. At the same time, it has a low friction coefficient, good self-lubricating performance, and strong scratch resistance, and is widely used in non-stick pans, kitchen utensils, easy-to-clean water pipe coatings, building waterproof materials, etc. Traditional polytetrafluoroethylene coatings have problems such as poor mechanical properties such as hardness and impact resistance, and poor wear resistance, which limit their actual application fields.

[0003] Combining polytetrafluoroethylene with silicone resin, etc., can make materials such as coating coatings with excellent performance. The Chinese patent with the publication number CN114517053B discloses a highly hydrophobic anti-fouling and flashover coating and a preparation method thereof. Using silicone resin, fumed silica, interfacial modifier, polytetrafluoroethylene micropowder, etc. as raw materials, the prepared anti-fouling and flashover coating has excellent hydrophobic performance, dielectric performance, and mechanical performance. However, the coating of this patent does not improve the scratch resistance, wear resistance and other performances of the coating, which is not conducive to the actual application of the coating in the fields of kitchen utensils, non-stick pans, wear-resistant coatings, etc. Polyarylethersulfone is a new type of resin material with strong high temperature resistance, good wear resistance, and high mechanical strength, and has a wide range of applications in materials such as polytetrafluoroethylene and silicone resin. Summary of the Invention

[0004] The present invention solves the problems of poor hardness and impact resistance of traditional polytetrafluoroethylene coating coatings, and at the same time improves the wear resistance and scratch resistance.

[0005] The technical solution of the present invention: a high-hardness scratch-resistant and wear-resistant coating for kitchen utensils and a preparation method thereof. The coating coating includes 75-90 parts by weight of polytetrafluoroethylene, 10-25 parts by weight of silicone resin, 3-10 parts by weight of fluorosilicone polyarylethersulfone resin, 0.5-6 parts by weight of filler, 0.04-0.5 parts by weight of dispersant, and 0.2-0.4 parts by weight of wetting agent.

[0006] The preparation method of the coating is as follows: adding the dispersion liquid of polytetrafluoroethylene, silicone resin, fluorosilicone polyarylethersulfone resin, filler, dispersant, and wetting agent into a grinder for grinding and dispersion to obtain a coating; then spraying the coating on the surface of the substrate, baking and curing at 120-130°C for 10-20 min first, and then baking and curing at 370-385°C for 20-30 min to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0007] Preferably, the high-hardness scratch-resistant and wear-resistant coating can be applied to fields such as kitchen utensils.

[0008] Preferably, the filler is silicon carbide micropowder, alumina micropowder or boron nitride nanosheet.

[0009] Preferably, the preparation method of the fluorosilicon polyarylether sulfone resin is as follows: (1) Add ethanol, bis(4-aminophenoxy)dimethylsilane, and 4-chlorobenzaldehyde into a reaction flask equipped with a condenser, stir and react at 50-65 °C for 4-6 h, add sodium borohydride, and stir and carry out a reduction reaction at 20-30 °C for 4-5 h. Rotate and evaporate, wash with water, and recrystallize the product with chloroform to obtain a silicon dichloride precursor. The preparation reaction formula is: .

[0010] (2) Add the silicon dichloride precursor, perfluoroyl chloride compound, and triethylamine with a molar ratio of 1:(2.4-3):(2.2-2.6) to tetrahydrofuran in the reaction flask, stir and react at 20-35 °C for 7-12 h, rotate and evaporate, wash the product with water and ethanol, and then recrystallize with chloroform to obtain a fluorosilicon dichloride monomer. The reaction formula is: .

[0011] (3) Add N-methylpyrrolidone and toluene with a volume ratio of 1:(0.3-0.6), potassium carbonate, hydroquinone, 4,4'-dichlorodiphenyl sulfone, and fluorosilicon dichloride monomer with a molar ratio of (150-180):100:(70-90):(10-30) into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, first stir and react at 150-160 °C for 3-4 h, then stir and react at 185-200 °C for 8-10 h. After cooling, pour the solution into ethanol, filter and wash the precipitate with ethanol, then add it to water, boil, filter, dry, and pulverize to obtain the fluorosilicon polyarylether sulfone resin. The preparation reaction formula is: .

[0012] Preferably, in (1), the molar ratio of bis(4-aminophenoxy)dimethylsilane, 4-chlorobenzaldehyde, and sodium borohydride is 1:(2-2.2):(2.4-2.8).

[0013] Preferably, in (2), the structural formula of the perfluoroyl chloride compound is C n F 2n+1 COCl, and n is any integer from 2 to 7.

[0014] Beneficial technical effects: Using bis(4-aminophenoxy)dimethylsilane, 4-chlorobenzaldehyde, perfluorobutyryl chloride, etc. as raw materials, a fluorosilicon dichloride monomer was prepared, and then polycondensation reaction was carried out with hydroquinone and 4,4'-dichlorodiphenyl sulfone to obtain a fluorosilicon polyarylether sulfone resin; further using polytetrafluoroethylene and silicone resin as the resin matrix of the coating, silicon carbide micropowder, etc. as fillers, and adding the fluorosilicon polyarylether sulfone resin to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0015] In the fluorosilicon polyarylether sulfone resin of the present invention, fluorine groups are introduced into its side chain, which is beneficial to improving the solubility parameter of the polyarylether sulfone resin in polytetrafluoroethylene and improving the compatibility between the two. At the same time, siloxane structural units identical to those of the silicone resin are introduced into the main chain of the polyarylether sulfone, so that there is better interfacial compatibility between the fluorosilicon polyarylether sulfone resin and polytetrafluoroethylene and silicone resin, enabling the fluorosilicon polyarylether sulfone resin to be evenly dispersed in the coating group. After adding the high-performance polyarylether sulfone resin, the Vickers hardness and impact resistance of the coating are improved, while the friction coefficient and wear mass are reduced, and the scratch-resistant and wear-resistant properties of the coating are improved. It has broad application prospects in kitchenware, non-stick pans, wear-resistant coatings, etc. Specific embodiments

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0017] The solid content of the following dispersion of polytetrafluoroethylene is 60%, model DISP 40LX, purchased from Shanghai Haosucheng New Materials Co., Ltd. The silicone resin, model SILRES MPF52, is purchased from Nanjing Qinghai Trading Co., Ltd.

[0018] Example 1 (1) Add 150 mL of ethanol, 20 mmol of bis(4-aminophenoxy)dimethylsilane, and 40 mmol of 4-chlorobenzaldehyde to a reaction flask equipped with a condenser, stir and react at 65 °C for 4 h, add 48 mmol of sodium borohydride, stir and carry out a reduction reaction at 30 °C for 5 h, rotary evaporate, wash with water, and recrystallize the product with chloroform to obtain a silicon dichloride precursor; the structural formula is: .

[0019] (2) Add 30 mmol of the silicon dichloride precursor, 72 mmol of perfluorobutyryl chloride, and 78 mmol of triethylamine to 200 mL of tetrahydrofuran in the reaction flask, stir and react at 35 °C for 7 h, rotary evaporate, wash the product with water and ethanol, and then recrystallize with chloroform to obtain a fluorosilicon dichloride monomer. The structural formula is: .

[0020] (3) Add 200 mL of N-methylpyrrolidone, 80 mL of toluene, 160 mmol of potassium carbonate, 100 mmol of hydroquinone, 90 mmol of 4,4'-dichlorodiphenyl sulfone, and 10 mmol of fluorosilicon dichloride monomer into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, first stir and react at 150 °C for 4 h, then stir and react at 190 °C for 10 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 60 min, filter, dry, and pulverize to obtain fluorosilicon polyarylether sulfone resin.

[0021] (4) Add a dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of fluorosilicon polyarylether sulfone resin, 18 g of silicon carbide micropowder (average particle size 4000 mesh), 1.4 g of dispersant BASF EFKA PX4310, and 3 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, first bake and cure at 130 °C for 20 min, and then bake and cure at 380 °C for 30 min to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0022] Comparative Example 1 (1) Add a dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 18 g of silicon carbide micropowder (average particle size 4000 mesh), 1.4 g of dispersant BASF EFKA PX4310, and 3 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, first bake and cure at 130 °C for 20 min, and then bake and cure at 380 °C for 30 min to obtain a coating.

[0023] Comparative Example 2 (1) Add 200 mL of N-methylpyrrolidone, 80 mL of toluene, 160 mmol of potassium carbonate, 100 mmol of hydroquinone, and 100 mmol of 4,4'-dichlorodiphenyl sulfone into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, first stir and react at 150 °C for 4 h, then stir and react at 190 °C for 10 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 60 min, filter, dry, and pulverize to obtain polyarylether sulfone resin.

[0024] (2) Add a dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of polyarylether sulfone resin, 18 g of silicon carbide micropowder (average particle size 4000 mesh), 1.4 g of dispersant BASF EFKA PX4310, and 3 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, bake and cure it at 130 °C for 20 min first, and then bake and cure it at 380 °C for 30 min to obtain a coating.

[0025] Comparative Example 3 (1) Add 150 mL of ethanol, 20 mmol of bis(4-aminophenoxy)dimethylsilane, and 40 mmol of 4-chlorobenzaldehyde into a reaction flask equipped with a condenser, stir and react at 65 °C for 4 h, perform rotary evaporation, and recrystallize the product with chloroform to obtain a silicon dichloride monomer. The structural formula is as follows: .

[0026] (2) Add 200 mL of N-methylpyrrolidone, 80 mL of toluene, 160 mmol of potassium carbonate, 100 mmol of hydroquinone, 90 mmol of 4,4'-dichlorodiphenyl sulfone, and 10 mmol of silicon dichloride monomer into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, first stir and react at 150 °C for 4 h, then stir and react at 190 °C for 10 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 60 min, filter, dry, and crush to obtain a silicon-containing polyarylether sulfone resin.

[0027] (3) Add a dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of silicon-containing polyarylether sulfone resin, 18 g of silicon carbide micropowder (average particle size 4000 mesh), 1.4 g of dispersant BASF EFKA PX4310, and 3 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, bake and cure it at 130 °C for 20 min first, and then bake and cure it at 380 °C for 30 min to obtain a coating.

[0028] Comparative Example 4 (1) Add 200 mL of N-methylpyrrolidone, 80 mL of toluene, 160 mmol of potassium carbonate, 100 mmol of hydroquinone, 90 mmol of 4,4'-dichlorodiphenyl sulfone, and 10 mmol of 3,5-dichlorobenzotrifluoride (structural formula is , with a CAS number of 54773-20-5), in a nitrogen atmosphere, first stir and react at 150 °C for 4 h, then stir and react at 190 °C for 10 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 60 min, filter, dry, and pulverize to obtain the fluorinated polyarylether sulfone resin.

[0029] (2) Add a dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of fluorinated polyarylether sulfone resin, 18 g of silicon carbide fine powder (average particle size 4000 mesh), 1.4 g of dispersant BASF EFKA PX4310, and 3 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, first bake and cure at 130 °C for 20 min, and then bake and cure at 380 °C for 30 min to obtain a coating.

[0030] Example 2 (1) Add 180 mL of ethanol, 20 mmol of bis(4-aminophenoxy)dimethylsilane, and 44 mmol of 4-chlorobenzaldehyde to a reaction flask equipped with a condenser, stir and react at 50 °C for 6 h, add 56 mmol of sodium borohydride, and stir for a reduction reaction at 20 °C for 5 h. Rotate and evaporate, wash with water, and recrystallize the product with chloroform to obtain the silicon dichloride precursor.

[0031] (2) Add 30 mmol of the silicon dichloride precursor, 90 mmol of perfluorooctanoyl chloride, and 66 mmol of triethylamine to 200 mL of tetrahydrofuran in the reaction flask, stir and react at 20 °C for 12 h, rotate and evaporate, wash the product with water and ethanol, and then recrystallize with chloroform to obtain the fluorosilicon dichloride monomer. The structural formula is: .

[0032] (3) Add 200 mL of N-methylpyrrolidone, 120 mL of toluene, 150 mmol of potassium carbonate, 100 mmol of hydroquinone, 70 mmol of 4,4'-dichlorodiphenyl sulfone, and 30 mmol of the fluorosilicon dichloride monomer to a reaction flask equipped with a water separator and a condenser. In a nitrogen atmosphere, first stir and react at 150 °C for 4 h, then stir and react at 200 °C for 8 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 40 min, filter, dry, and pulverize to obtain the fluorosilicon-containing polyarylether sulfone resin.

[0033] (4) Add a dispersion containing 850 g of polytetrafluoroethylene, 150 g of silicone resin, 50 g of fluorosilicon polyarylether sulfone resin, 60 g of alumina fine powder (average thickness 200 nm) (average particle size 6000 mesh), 5 g of dispersant BASF EFKA PX4310, and 4 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, bake and cure it at 120 °C for 20 min first, and then bake and cure it at 385 °C for 20 min to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0034] Example 3 (1) Add 200 mL of N-methylpyrrolidone, 60 mL of toluene, 180 mmol of potassium carbonate, 100 mmol of hydroquinone, 80 mmol of 4,4'-dichlorodiphenyl sulfone, and 20 mmol of fluorosilicon dichloride monomer (prepared in Example 1) into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, stir and react at 160 °C for 3 h first, then stir and react at 185 °C for 10 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 60 min, filter, dry, and crush to obtain fluorosilicon polyarylether sulfone resin.

[0035] (2) Add a dispersion containing 800 g of polytetrafluoroethylene, 200 g of silicone resin, 75 g of fluorosilicon polyarylether sulfone resin, 25 g of silicon carbide fine powder (average particle size 4000 mesh), 2.2 g of dispersant BASF EFKA PX4310, and 2 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, bake and cure it at 120 °C for 20 min first, and then bake and cure it at 370 °C for 30 min to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0036] Example 4 (1) Add 200 mL of N-methylpyrrolidone, 80 mL of toluene, 160 mmol of potassium carbonate, 100 mmol of hydroquinone, 80 mmol of 4,4'-dichlorodiphenyl sulfone, and 20 mmol of fluorosilicon dichloride monomer (prepared in Example 1) into a reaction flask equipped with a water separator and a condenser. Under a nitrogen atmosphere, stir and react at 150 °C for 3 h first, then stir and react at 200 °C for 8 h. After cooling, pour the solution into ethanol, filter, wash the precipitate with ethanol, then add it to water, boil for 40 min, filter, dry, and crush to obtain fluorosilicon polyarylether sulfone resin.

[0037] (2) Add a dispersion containing 750 g of polytetrafluoroethylene, 250 g of silicone resin, 100 g of fluorosilicone polyarylether sulfone resin, 5 g of boron nitride nanosheets (), 0.4 g of dispersant BASF EFKA PX4310, and 2.7 g of wetting agent FC-4430 (fluorocarbon surfactant) into a grinder for grinding and dispersion to obtain a coating; then spray the coating on the surface of the substrate, bake and cure it at 120 °C for 15 min first, and then bake and cure it at 380 °C for 30 min to obtain a high-hardness scratch-resistant and wear-resistant coating.

[0038] Use a microhardness tester to test the Vickers hardness of the coating. The test load is 0.5 N and the test time is 15 s. Test the Vickers hardness at 5 different positions of the coating and take the average value.

[0039] Test the impact resistance of the coating according to the standard of GB / T 1732-2020.

[0040] Test the friction coefficient and wear amount of the coating according to the standard of GB / T 3960-2016.

[0041] Table 1 Coating Performance Test As can be seen from Table 1, in Comparative Example 1, using polytetrafluoroethylene and silicone resin as the resin matrix of the coating and silicon carbide micropowder as the filler, the prepared coating has low Vickers hardness and impact resistance, poor mechanical properties, and large friction coefficient and wear amount, with low scratch-resistant and wear-resistant performance. In Example 1, fluorosilicone polyarylether sulfone resin is added to the coating, and fluorine groups are introduced into its side chain, which is beneficial to increasing the solubility parameter of polyarylether sulfone resin in polytetrafluoroethylene and improving the compatibility between the two. At the same time, siloxane structural units identical to those of silicone resin are introduced into the main chain of polyarylether sulfone, so that there is better interfacial compatibility between fluorosilicone polyarylether sulfone resin, polytetrafluoroethylene, and silicone resin, making the fluorosilicone polyarylether sulfone resin evenly dispersed in the coating groups, significantly enhancing the performance of the coating, increasing the Vickers hardness and impact resistance of the coating, while reducing the friction coefficient and wear quality, and improving the scratch-resistant and wear-resistant performance of the coating.

[0042] Compared with Comparative Example 1 and Example 1, in Comparative Example 2, the side chain of the prepared polyarylether sulfone resin does not contain fluorine groups and the main chain does not contain siloxane structural units, resulting in low compatibility with polytetrafluoroethylene and silicone resin and poor dispersibility in the coating, leading to lower Vickers hardness and impact resistance of the coating. At the same time, it does not significantly reduce the friction coefficient and wear quality of the coating, and the scratch-resistant and wear-resistant performance of the coating is poor.

[0043] Compared with Example 1, in Comparative Example 3, the silicon dichloride monomer was used as the polymerization monomer, and the prepared silicon polyarylether sulfone resin does not contain fluorine groups, and has poor compatibility with polytetrafluoroethylene. In Comparative Example 4, 3,5-dichlorobenzotrifluoride was used as the polymerization monomer, and the prepared fluorinated polyarylether sulfone resin does not contain siloxane structural units, and has poor compatibility with silicone resin. The dispersibility of the polyarylether sulfone resins of both in the coating is lower than that of the fluorosilicon polyarylether sulfone resin of Example 1, resulting in the Vickers hardness and impact resistance of the coating being lower than those of Example 1, the mechanical properties being poor, the friction coefficient and wear mass being greater than those of Example 1, and the scratch resistance and wear resistance of the coating being poor.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A high-hardness, scratch-resistant and wear-resistant coating for kitchenware and a preparation method thereof, characterized in that: The coating comprises 75-90 parts by weight of polytetrafluoroethylene, 10-25 parts by weight of silicone resin, 3-10 parts by weight of fluorosilicone polyarylethersulfone resin, 0.5-6 parts by weight of filler, 0.04-0.5 parts by weight of dispersant, and 0.2-0.4 parts by weight of wetting agent; The preparation method of the fluorosilicone polyarylethersulfone resin comprises: adding N-methylpyrrolidone, toluene, potassium carbonate in a molar ratio of (150-180):100:(70-90):(10-30), hydroquinone, 4,4'-dichlorodiphenylsulfone, and fluorosilicone dichloro monomer into a reaction bottle equipped with a water separator and a condenser, reacting in a nitrogen atmosphere, cooling the solution, pouring the solution into ethanol, filtering, washing the precipitate with ethanol, and then adding the solution into water, boiling, filtering, drying, and crushing to obtain the fluorosilicone polyarylethersulfone resin; The fluorosilicon dichloride monomer has the following structural formula (I): Formula (I); n is any integer from 2 to 7.

2. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 1, characterized in that: The volume ratio of the N-methylpyrrolidone to toluene is 1:(0.3-0.6).

3. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 1, characterized in that: The reaction was first stirred at 150-160°C for 3-4 h, and then at 185-200°C for 8-10 h.

4. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 1, characterized in that: The filler is silicon carbide micropowder, aluminum oxide micropowder or boron nitride nanosheet.

5. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 1, characterized in that: The preparation method of the fluorosilicon dichloro monomer is as follows: (1) Add ethanol, bis(4-aminophenoxy)dimethylsilane and 4-chlorobenzaldehyde to a reaction bottle equipped with a condenser, stir to react, then add sodium borohydride to perform a reduction reaction, perform rotary evaporation, wash, and recrystallize the product to obtain a silicon dichloride precursor; (2) Adding a silicon dichloride precursor, a perfluoroacyl chloride compound, and triethylamine in a molar ratio of 1:(2.4-3):(2.2-2.6) to tetrahydrofuran into a reaction flask, stirring for reaction, and then rotary evaporating, washing, and recrystallizing the product to obtain a fluorosilicon dichloride monomer.

6. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 5, characterized in that: In the above (1), the reaction is stirred at 50-65°C for 4-6 hours; the reduction reaction is stirred at 20-30°C for 4-5 hours.

7. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 5, characterized in that: In the above (1), the molar ratio of bis(4-aminophenoxy)dimethylsilane, 4-chlorobenzaldehyde and sodium borohydride is 1:(2-2.2):(2.4-2.8).

8. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 5, characterized in that: The reaction in (2) is stirred at 20-35°C for 7-12 hours.

9. The high-hardness anti-scratch and wear-resistant coating for kitchenware according to claim 5, characterized in that: The structural formula of the perfluoroacyl chloride compound in (2) is C n F 2n+1 COCl, n is any integer from 2 to 7.

10. A method for preparing a high-hardness anti-scratch and wear-resistant coating for kitchenware according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: adding polytetrafluoroethylene dispersion, silicone resin, fluorosilicone polyarylethersulfone resin, filler, dispersant and wetting agent into a grinder for grinding and dispersion to obtain a coating; then spraying the coating on the surface of a substrate, first baking and curing at 120-130° C. for 10-20 minutes, and then baking and curing at 370-385° C. for 20-30 minutes to obtain a high-hardness, scratch-resistant and wear-resistant coating.

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