High-hardness, scratch-resistant, and wear-resistant coating for kitchenware and preparation method thereof

Abstract

The present invention relates to the field of coating technology, and discloses a high-hardness, scratch-resistant, and wear-resistant coating for kitchen utensils and a preparation method thereof. The present invention uses polytetrafluoroethylene and silicone resin as the resin matrix of the coating, silicon carbide micropowder and the like as fillers, and adds fluorosilicone polyarylethersulfone resin to obtain a high-hardness, scratch-resistant, and wear-resistant coating. The side chain of the fluorosilicone polyarylethersulfone resin contains a fluorine group, which is beneficial to improving the solubility parameter of the polyarylethersulfone resin in polytetrafluoroethylene and improving the compatibility between the two. At the same time, the main chain of the polyarylethersulfone is introduced with the same siloxane structural unit as the silicone resin, thereby achieving better interface compatibility between the fluorosilicone polyarylethersulfone resin and the polytetrafluoroethylene and silicone resin, which is beneficial to improving the Vickers hardness and impact resistance of the coating, while reducing the friction coefficient and wear quality, improving the scratch resistance and wear resistance of the coating, and having broad application prospects in kitchen utensils and the like.

Description

Technical Field

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

[0002] Polytetrafluoroethylene (PTFE) boasts excellent resistance to high and low temperatures, aging, acid and alkali, and corrosion. It also boasts a low coefficient of friction, excellent self-lubrication, and strong scratch resistance. It is widely used in non-stick pans, kitchenware, easy-to-clean pipe coatings, and building waterproofing materials. However, traditional PTFE coatings suffer from poor mechanical properties such as hardness and impact resistance, as well as poor wear resistance, which limits their practical applications.

[0003] By combining polytetrafluoroethylene with silicone resins and the like, materials such as coatings with excellent performance can be made. The Chinese patent with the announcement number CN114517053B discloses a highly hydrophobic anti-fouling flashover coating and its preparation method. The anti-fouling flashover coating prepared with silicone resin, fumed silica, interfacial modifier, polytetrafluoroethylene micropowder and the like as raw materials has excellent hydrophobicity, dielectric properties and mechanical properties. However, the coating of this patent does not improve the anti-scratch and wear resistance of the coating. This is not conducive to the practical application of the coating in the fields of kitchenware, non-stick pans, wear-resistant coatings and the like. Polyarylethersulfone is a new type of resin material with strong high temperature resistance, good wear resistance and high mechanical strength. It is widely used in materials such as polytetrafluoroethylene and silicone resins. Summary of the Invention

[0004] The invention solves the problem of poor hardness and impact resistance of traditional polytetrafluoroethylene coatings, and simultaneously improves the wear resistance and scratch resistance.

[0005] The present invention provides a high-hardness, scratch-resistant, and wear-resistant coating for kitchenware and a preparation method. The coating comprises 75-90 parts by weight of polytetrafluoroethylene, 10-25 parts by weight of an organosilicon resin, 3-10 parts by weight of a fluorosilicone polyarylethersulfone resin, 0.5-6 parts by weight of a filler, 0.04-0.5 parts by weight of a dispersant, and 0.2-0.4 parts by weight of a wetting agent.

[0006] The coating preparation method is as follows: 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 the 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.

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

[0008] Preferably, the filler is silicon carbide micropowder, aluminum oxide micropowder or boron nitride nanosheets.

[0009] Preferably, the preparation method of fluorosilicone polyarylethersulfone resin is:

[0010] (1) Add ethanol, bis(4-aminophenoxy)dimethylsilane, and 4-chlorobenzaldehyde to a reaction flask equipped with a condenser, stir and react at 50-65°C for 4-6 hours, add sodium borohydride, stir and react at 20-30°C for 4-5 hours, rotary evaporate, wash with water, and recrystallize the product with chloroform to obtain a silicon dichloride precursor. The preparation reaction formula is:

[0011]

[0012] (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 and reacting at 20-35° C. for 7-12 hours, rotary evaporation, washing the product with water and ethanol, and then recrystallizing with chloroform to obtain a fluorosilicon dichloride monomer.

[0013] The reaction formula is:

[0014]

[0015] (3) Add N-methylpyrrolidone and toluene in a volume ratio of 1:(0.3-0.6) and potassium carbonate, hydroquinone, 4,4'-dichlorodiphenyl sulfone, and fluorosilicon dichloride monomer in a molar ratio of (150-180):100:(70-90):(10-30) to a reaction flask equipped with a water separator and a condenser. In a nitrogen atmosphere, stir the reaction at 150-160°C for 3-4 hours, then stir the reaction at 185-200°C for 8-10 hours. After cooling, pour the solution into ethanol, filter, and wash the precipitate with ethanol. Then, add the solution to water, boil, filter, dry, and crush to obtain fluorosilicon polyarylethersulfone resin.

[0016] 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).

[0017] Preferably, 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.

[0018] Beneficial technical effects: The present invention uses bis(4-aminophenoxy)dimethylsilane, 4-chlorobenzaldehyde, perfluorobutyryl chloride, etc. as raw materials to prepare fluorosilicon dichloro monomer, and then carries out condensation reaction with hydroquinone and 4,4'-dichlorodiphenyl sulfone to obtain fluorosilicon polyarylethersulfone resin; further, polytetrafluoroethylene and silicone resin are used as the resin matrix of the coating, silicon carbide micropowder, etc. are used as fillers, and fluorosilicon polyarylethersulfone resin is added to obtain a high-hardness, scratch-resistant and wear-resistant coating.

[0019] The fluorosilicone polyarylethersulfone resin of the present invention has fluorine groups introduced into its side chains, which helps to increase the solubility parameter of the polyarylethersulfone resin in polytetrafluoroethylene and improve the compatibility between the two. At the same time, the polyarylethersulfone main chain also introduces a siloxane structural unit identical to that of the organosilicon resin, thereby achieving better interfacial compatibility between the fluorosilicone polyarylethersulfone resin and the polytetrafluoroethylene and organosilicon resin, and allowing the fluorosilicone polyarylethersulfone resin to be evenly dispersed in the coating group. After the addition of the high-performance polyarylethersulfone resin, the Vickers hardness and impact resistance of the coating are increased, while the friction coefficient and wear quality are reduced, and the scratch resistance and wear resistance of the coating are improved. The invention has broad application prospects in kitchenware, non-stick pans, wear-resistant coatings, and the like. DETAILED DESCRIPTION

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0021] The following polytetrafluoroethylene dispersion has a solid content of 60%, model DISP 40LX, purchased from Shanghai Haosucheng New Materials Co., Ltd. The organic silicone resin, model SILRES MPF52, was purchased from Nanjing Qinghai Trading Co., Ltd.

[0022] Example 1

[0023] (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 reduce 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:

[0024] (2) Add 30 mmol of silicon dichloride precursor, 72 mmol of perfluorobutyryl chloride, and 78 mmol of triethylamine to 200 mL of tetrahydrofuran in a reaction flask, stir and react at 35°C for 7 hours, rotary evaporate, wash the product with water and ethanol, and then recrystallize it with chloroform to obtain fluorosilicon dichloride monomer. The structural formula is:

[0025] (3) To a reaction flask equipped with a water separator and a condenser, 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 were added. In a nitrogen atmosphere, the mixture was stirred at 150°C for 4 h, and then at 190°C for 10 h. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 60 min, filtered, dried, and crushed to obtain a fluorosilicon polyarylethersulfone resin.

[0026] (4) A dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of fluorosilicone polyarylethersulfone 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) were added into a grinder for grinding and dispersion to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 130°C for 20 min, and then baked and cured at 380°C for 30 min to obtain a high-hardness, scratch-resistant, and wear-resistant coating.

[0027] Comparative Example 1

[0028] (1) 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) were added to a grinder and ground and dispersed to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 130°C for 20 min, and then baked and cured at 380°C for 30 min to obtain a coating.

[0029] Comparative Example 2

[0030] (1) To a reaction flask equipped with a water separator and a condenser, 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 were added. The mixture was stirred at 150°C for 4 h and then at 190°C for 10 h in a nitrogen atmosphere. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 60 min, filtered, dried, and crushed to obtain a polyarylethersulfone resin.

[0031] (2) A dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of polyarylethersulfone 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) were added into a grinder and ground and dispersed to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 130°C for 20 min, and then baked and cured at 380°C for 30 min to obtain a coating.

[0032] Comparative Example 3

[0033] (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, rotary evaporate, and recrystallize the product with chloroform to obtain silicon dichloride monomer. The structural formula is as follows:

[0034]

[0035] (2) To a reaction flask equipped with a water separator and a condenser, 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 were added. In a nitrogen atmosphere, the mixture was stirred at 150°C for 4 h, and then at 190°C for 10 h. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 60 min, filtered, dried, and crushed to obtain silicon polyarylethersulfone resin.

[0036] (3) A dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of silicon polyethersulfone 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) were added into a grinder and ground and dispersed to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 130°C for 20 min, and then baked and cured at 380°C for 30 min to obtain a coating.

[0037] Comparative Example 4

[0038] (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, 10 mmol of 3,5-dichlorotrifluorotoluene (structural formula: The CAS number is 54773-20-5), and the reaction is stirred at 150°C for 4 hours and then at 190°C for 10 hours in a nitrogen atmosphere. After cooling, the solution is poured into ethanol, filtered, and the precipitate is washed with ethanol, then added to water, boiled for 60 minutes, filtered, dried, and crushed to obtain a fluoropolyaryl ether sulfone resin.

[0039] (2) A dispersion containing 900 g of polytetrafluoroethylene, 100 g of silicone resin, 30 g of fluoropolyarylethersulfone 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) were added into a grinder and ground and dispersed to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 130°C for 20 min, and then baked and cured at 380°C for 30 min to obtain a coating.

[0040] Example 2

[0041] (1) To a reaction flask equipped with a condenser, 180 mL of ethanol, 20 mmol of bis(4-aminophenoxy)dimethylsilane, and 44 mmol of 4-chlorobenzaldehyde were added, and the mixture was stirred at 50°C for 6 h. 56 mmol of sodium borohydride was added, and the mixture was stirred at 20°C for 5 h for reduction reaction. The mixture was rotary evaporated, washed with water, and the product was recrystallized with chloroform to obtain a silicon dichloride precursor.

[0042] (2) Add 30 mmol of silicon dichloride precursor, 90 mmol of perfluorooctanoyl chloride, and 66 mmol of triethylamine to 200 mL of tetrahydrofuran in a reaction flask, stir and react at 20°C for 12 hours, rotary evaporate, wash the product with water and ethanol, and then recrystallize it with chloroform to obtain fluorosilicon dichloride monomer. The structural formula is:

[0043] (3) To a reaction flask equipped with a water separator and a condenser, 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 fluorosilicon dichloride monomer were added. In a nitrogen atmosphere, the mixture was stirred at 150°C for 4 h, then at 200°C for 8 h. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 40 min, filtered, dried, and crushed to obtain a fluorosilicon polyarylethersulfone resin.

[0044] (4) A dispersion containing 850 g of polytetrafluoroethylene, 150 g of silicone resin, 50 g of fluorosilicone polyarylethersulfone resin, 60 g of alumina 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) were added to a grinder for grinding and dispersion to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 120° C. for 20 min, and then baked and cured at 385° C. for 20 min to obtain a high-hardness, scratch-resistant, and wear-resistant coating.

[0045] Example 3

[0046] (1) To a reaction flask equipped with a water separator and a condenser, 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) were added. In a nitrogen atmosphere, the mixture was stirred at 160° C. for 3 h, then at 185° C. for 10 h. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 60 min, filtered, dried, and crushed to obtain a fluorosilicon polyarylethersulfone resin.

[0047] (2) A dispersion containing 800 g of polytetrafluoroethylene, 200 g of silicone resin, 75 g of fluorosilicone polyarylethersulfone resin, 25 g of silicon carbide micropowder (average particle size 4000 mesh), 2.2 g of dispersant BASF EFKA PX4310, and 2 g of wetting agent FC-4430 (fluorocarbon surfactant) were added into a grinder for grinding and dispersion to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 120° C. for 20 min, and then baked and cured at 370° C. for 30 min to obtain a high-hardness, scratch-resistant, and wear-resistant coating.

[0048] Example 4

[0049] (1) To a reaction flask equipped with a water separator and a condenser, 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) were added. In a nitrogen atmosphere, the mixture was stirred at 150° C. for 3 h, then at 200° C. for 8 h. After cooling, the solution was poured into ethanol, filtered, and the precipitate was washed with ethanol. The precipitate was then added to water, boiled for 40 min, filtered, dried, and crushed to obtain a fluorosilicon polyarylethersulfone resin.

[0050] (2) A dispersion containing 750 g of polytetrafluoroethylene, 250 g of silicone resin, 100 g of fluorosilicone polyarylethersulfone 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) were added to a grinder for grinding and dispersion to obtain a coating; the coating was then sprayed on the surface of the substrate, first baked and cured at 120° C. for 15 min, and then baked and cured at 380° C. for 30 min to obtain a high-hardness, scratch-resistant, and wear-resistant coating.

[0051] The Vickers hardness of the coating was tested using a microhardness tester with a test load of 0.5 N and a test time of 15 s. The Vickers hardness of the coating was tested at 5 different positions and the average value was taken.

[0052] The impact resistance of the coating is tested according to GB / T 1732-2020.

[0053] The friction coefficient and wear volume of the coating were tested according to GB / T 3960-2016.

[0054] Table 1 Coating performance test

[0055]

[0056] As shown in Table 1, the coating prepared in Comparative Example 1 has low Vickers hardness and impact resistance, poor mechanical properties, large friction coefficient and wear, and low scratch resistance and wear resistance. Fluorosilicone polyarylethersulfone resin is added to the coating of Example 1, and a fluorine group is introduced into its side chain, which is conducive to improving the solubility parameter of polyarylethersulfone resin in polytetrafluoroethylene and improving the compatibility of the two. At the same time, the same siloxane structural unit as the organosilicon resin is introduced into the main chain of polyarylethersulfone, thereby achieving better interfacial compatibility between the fluorosilicone polyarylethersulfone resin and the polytetrafluoroethylene and organosilicon resin, and making the fluorosilicone polyarylethersulfone resin uniformly dispersed in the coating group, significantly enhancing the performance of the coating, improving the Vickers hardness and impact resistance of the coating, while reducing the friction coefficient and wear quality, and improving the scratch resistance and wear resistance of the coating.

[0057] Compared with Comparative Example 1 and Example 1, the side chain of the polyarylethersulfone resin prepared in Comparative Example 2 does not contain a fluorine group, the main chain does not contain a siloxane structural unit, and has low compatibility with polytetrafluoroethylene and silicone resin. The dispersibility in the coating is very poor, resulting in 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 resistance and wear resistance of the coating are poor.

[0058] Compared with Example 1, Comparative Example 3 uses silicon dichloromonomer as the polymerization monomer, and the prepared silicon polyarylethersulfone resin does not contain a fluorine group and has poor compatibility with polytetrafluoroethylene. Comparative Example 4 uses 3,5-dichlorotrifluorotoluene as the polymerization monomer, and the prepared fluoropolyarylethersulfone resin does not contain a siloxane structural unit and has poor compatibility with the silicone resin. The dispersibility of the polyarylethersulfone resins of the two in the coating is lower than that of the fluorosilicone polyarylethersulfone resin of Example 1, resulting in the Vickers hardness and impact resistance of the coating being lower than that of Example 1, the mechanical properties being poor, the friction coefficient and wear quality being greater than that of Example 1, and the scratch resistance and wear resistance of the coating being poor.

[0059] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. A high-hardness, scratch-resistant, and wear-resistant coating for kitchenware, 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 the following steps: 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 to 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, then adding the solution to water, boiling, filtering, drying, and crushing the solution to obtain the fluorosilicone polyarylethersulfone resin; The fluorosilicon dichloride monomer has the following structural formula (I): n is any integer from 2 to 7.

2. The high-hardness, scratch-resistant, 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, scratch-resistant, 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, scratch-resistant, 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 nanosheets.

5. The high-hardness, scratch-resistant, and wear-resistant coating for kitchenware according to claim 1, characterized in that: The preparation method of the fluorosilicon dichloride monomer is as follows: (1) adding ethanol, bis(4-aminophenoxy)dimethylsilane, and 4-chlorobenzaldehyde to a reaction flask equipped with a condenser, stirring the reaction, and then adding sodium borohydride to carry out a reduction reaction, rotary evaporation, washing, and recrystallizing 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 the reaction, and then rotary evaporation, washing, and recrystallizing the product to obtain a fluorosilicon dichloride monomer.

6. The high-hardness, scratch-resistant, and wear-resistant coating for kitchenware according to claim 5, characterized in that: In the step (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, scratch-resistant, 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, scratch-resistant, 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, scratch-resistant, 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, scratch-resistant, 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 a polytetrafluoroethylene dispersion, an organic silicone resin, a fluorosilicone polyarylethersulfone resin, a filler, a dispersant, and a wetting agent into a grinder, grinding and dispersing the mixture to obtain a coating; then spraying the coating onto a surface of a substrate, first baking and curing the coating at 120-130° C. for 10-20 minutes, and then baking and curing the coating at 370-385° C. for 20-30 minutes to obtain a high-hardness, scratch-resistant, and wear-resistant coating.

Images