Anticorrosion wear-resistant coating for electromagnetic valve armature core of shock absorber and preparation method thereof

Abstract

This invention relates to the field of protective coating technology, specifically to an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve and its preparation method; it addresses the problems of poor wear resistance and corrosion resistance in existing coatings; the coating is prepared by spraying a mixture of thiazole-piperazine-based triazine modified polyurethane, waterborne epoxy resin emulsion, and styrene-acrylic emulsion onto a stainless steel surface to synthesize thiazole-piperazine-based triazine modified polyurethane. First, a first intermediate containing a triazine ring is prepared, and then piperazine and thiazole are grafted onto the first intermediate and reacted with isophorone diisocyanate to obtain the modified polyurethane. The triazine ring, thiazole, and piperazine heterocyclic structure have good rigidity and chemical stability, improving the coating's hardness and scratch resistance while also enhancing its corrosion resistance, resisting damage to the armature core from external corrosive media and mechanical friction, and enhancing its service life and durability.

Description

Technical Field

[0001] This invention relates to the field of protective coating technology, specifically to an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve and its preparation method. Background Technology

[0002] The armature core is the core component of the shock absorber solenoid valve. However, in the working environment, the armature core is susceptible to external corrosion and wear, leading to a decline in the performance of the solenoid valve and consequently affecting the service life and operational reliability of the shock absorber. While existing coating technologies offer some corrosion resistance, repeated friction and wear can cause the coating to peel off, thus losing its protective function. This invention provides an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve and its preparation method, which can effectively extend the service life of the armature core, improve the operational reliability of the solenoid valve, and thus significantly improve the working performance and service life of the shock absorber. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the present invention aims to provide: an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve and its preparation method, which solves the problems of poor wear resistance and poor corrosion resistance of existing coatings.

[0004] The objective of this invention can be achieved through the following technical solutions: In a first aspect, this application provides an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following parts by weight: The mixture comprises 50-75 parts of waterborne epoxy resin emulsion, 20-40 parts of styrene-acrylic emulsion, 25-30 parts of thiazole-piperazinyltriazine modified polyurethane, 5-7 parts of silicon nitride, 3-5 parts of graphene, 3-5 parts of sodium pyrophosphate, 3-5 parts of ethylenediamine, 0.5-1.2 parts of sodium stannate, and 50-100 parts of water.

[0005] The thiazole-piperazinyltriazine modified polyurethane is prepared by the following steps: Step A1: Add 6-amino-1H-quinazolin-4-one and tetrahydrofuran to a three-necked flask equipped with a thermometer and a mechanical stirrer, purge with nitrogen for protection, transfer to an ice bath, add triethylamine, add melamine chloride-tetrahydrofuran solution dropwise, stir for 1 h, raise the temperature to 24-26℃ and react for 2 h, raise the temperature to 80℃ and stir for 6-8 h, remove tetrahydrofuran and triethylamine by rotary evaporation, add to dichloromethane, extract with deionized water and saturated sodium chloride solution in sequence, remove deionized water with molecular sieve, remove dichloromethane by rotary evaporation at 40℃, dry to obtain the first intermediate;

[0006] Step A2: Add the first intermediate and 1,2-dichloroethane to a three-necked flask equipped with a mechanical stirrer, thermometer and reflux condenser, stir for 10-15 min, add thionyl chloride and N,N-dimethylformamide, heat to reflux and react for 6 h, remove 1,2-dichloroethane, thionyl chloride and N,N-dimethylformamide by vacuum distillation, wash three times with deionized water and saturated sodium chloride solution, dry with anhydrous sodium sulfate, concentrate the organic phase and recrystallize with petroleum ether to obtain the second intermediate;

[0007] Step A3: Add the second intermediate, piperazine, and anhydrous ethanol to a two-necked flask equipped with a thermometer and a reflux condenser, heat to reflux, react for 3 hours, concentrate under reduced pressure, add saturated brine, filter, extract and concentrate the filtrate with dichloromethane, purify with a methanol-dichloromethane mixture, and dry to obtain the third intermediate.

[0008] Step A4: Add 3,5-dihydroxyacetophenone, N-bromosuccinimide, dichloromethane, acetic acid, and anhydrous ethanol to a three-necked flask equipped with a mechanical stirrer and thermometer. Stir for 10-20 min, react at 0-5℃ for 2-3 h, raise the temperature to 24-26℃ and stir for 4 h. After filtration, wash the filter residue with saturated brine, concentrate the organic phase, and add it to a single-necked flask equipped with a reflux condenser along with thiourea, ethanol, and iodine. Reflux for 4 h, concentrate, and filter to obtain the fourth intermediate.

[0009] Step A5: Add the fourth intermediate and N,N-dimethylformamide to a two-necked flask equipped with a mechanical stirrer, stir for 5-10 min, add chloroacetyl chloride dropwise at 0-5℃, heat to 25-30℃ and react for 2-3 h, add to ice water and stir for 1 h, filter, wash the filter residue with deionized water, dry, and obtain the fifth intermediate;

[0010] Step A6: Add the third intermediate, the fifth intermediate, N,N-dimethylformamide and anhydrous potassium carbonate to a three-necked flask equipped with a thermometer and a mechanical stirrer, react at 40-50℃ for 6-8 hours, add deionized water and stir for 30 minutes, filter, separate the filter residue with a methanol-dichloromethane mixture, dry, and obtain thiazolium-piperazinyltriazine;

[0011]

[0012] Step A7: Isophorone diisocyanate, dibutyltin dilaurate, and tetrahydrofuran were added to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Nitrogen gas was introduced for 30 minutes, and polyethylene glycol-tetrahydrofuran solution was added dropwise. The reaction was carried out at 80°C for 2-3 hours. Thiazole-piperazinyltriazine was added and reacted at 80°C for 2-3 hours. The mixture was purified by column chromatography with petroleum ether, precipitated three times, and the precipitate was obtained by rotary evaporation to obtain thiazole-piperazinyltriazine modified polyurethane.

[0013] As a further aspect of the present invention: the ratio of 6-amino-1H-quinazolin-4-one, tetrahydrofuran, triethylamine, melamine-tetrahydrofuran solution and dichloromethane used in step A1 is 0.05-0.1 mol: 100-200 mL: 8-16 mL: 50-100 mL: 150-300 mL.

[0014] As a further aspect of the present invention: the ratio of cyanochloride to tetrahydrofuran in the cyanochloride-tetrahydrofuran solution in step A1 is 27.1-54.2 mmol: 50-100 mL.

[0015] As a further aspect of the present invention: in step A2, the ratio of the first intermediate, 1,2-dichloroethane, thionyl chloride and N,N-dimethylformamide is 34.2-68.4 mmol: 50-100 mL: 12-24 mL: 1-2 mL.

[0016] As a further aspect of the present invention: in step A3, the ratio of the second intermediate, piperazine, anhydrous ethanol and saturated saline solution is 30.4-60.8 mmol: 45.6-91.2 mmol: 150-300 mL: 150-300 mL.

[0017] As a further aspect of the present invention: the volume ratio of methanol to dichloromethane in the methanol-dichloromethane mixture in step A3 is 40:1.

[0018] As a further embodiment of the present invention: the ratio of 3,5-dihydroxyacetophenone, N-bromosuccinimide, dichloromethane, acetic acid, anhydrous ethanol, thiourea, ethanol and iodine in step A4 is 2.2-4.4 mmol: 2.4-4.8 mmol: 50-100 mL: 0.22-0.44 mmol: 5-10 mL: 2.2-4.4 mmol: 10-20 mL: 10-20 mg.

[0019] As a further aspect of the present invention: the ratio of the fourth intermediate, N,N-dimethylformamide, chloroacetyl chloride and ice water in step A5 is 2-4 mmol: 8-16 mL: 2.2-4.4 mmol: 100-200 mL.

[0020] As a further embodiment of the present invention: the ratio of the third intermediate, the fifth intermediate, N,N-dimethylformamide, anhydrous potassium carbonate and deionized water used in step A6 is 1.5-3 mmol: 1.5-3 mmol: 10-20 mL: 1.8-3.6 mmol: 100-200 mL.

[0021] As a further aspect of the present invention: the volume ratio of methanol to dichloromethane in the methanol-dichloromethane mixture in step A6 is 70:1.

[0022] As a further embodiment of the present invention: the ratio of isophorone diisocyanate, dibutyltin dilaurate, tetrahydrofuran, polyethylene glycol-tetrahydrofuran solution and thiazole-piperazinyl triazine in step A7 is 0.0252-0.0504 mol: 0.09-0.18 g: 50-100 mL: 200-400 mL: 0.0084-0.0168 mol.

[0023] As a further aspect of the present invention: the ratio of polyethylene glycol to tetrahydrofuran in the polyethylene glycol-tetrahydrofuran solution in step A7 is 20-40g: 200-400mL.

[0024] As a further aspect of the present invention: the polyethylene glycol mentioned in step A7 is of type PEG2000.

[0025] Secondly, a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve includes the following steps: Step 1: Weigh out 50-75 parts by weight of waterborne epoxy resin emulsion, 20-40 parts by weight of styrene-acrylic emulsion, 25-30 parts by weight of thiazole-piperazinyltriazine modified polyurethane, 5-7 parts by weight of silicon nitride, 3-5 parts by weight of graphene, 3-5 parts by weight of sodium pyrophosphate, 3-5 parts by weight of ethylenediamine, 0.5-1.2 parts by weight of sodium stannate, and 50-100 parts by weight of water, and set aside. The waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm. Step 2: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, thiazole-piperazinyltriazine modified polyurethane and water at 500-800 r / min for 20-30 min, then add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 500-800 r / min for 30-40 min to obtain a mixture. Step 3: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0026] The beneficial effects of this invention are: The present invention relates to an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve. The coating is a polyurethane with a triazine ring as the core and quinazoline, thiazole, and piperazine rings in the side chains. The coating is mixed with an aqueous epoxy resin emulsion and a styrene-acrylic emulsion and then sprayed onto the stainless steel surface to prevent the performance and service life from being reduced due to corrosion and wear in the operating environment.

[0027] To prepare an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, the process begins with the synthesis of a first intermediate containing a triazine ring and a quinazoline ring using 6-amino-1H-quinazolin-4-one and cyanuric chloride. This first intermediate reacts with thionyl chloride to obtain a second intermediate. The second intermediate then reacts with piperazine to yield a third intermediate containing a piperazine ring and a triazine ring. 3,5-dihydroxyacetophenone reacts with N-bromosuccinimide to introduce bromine, followed by a reaction with thiourea to generate a fourth intermediate containing an aminothiazole. This fourth intermediate reacts with chloroacetyl chloride to generate a fifth intermediate containing chloroacetamide thiazole. The chloroacetyl group in the fifth intermediate reacts with the secondary amino group in the piperazine ring to yield a thiazole-piperazinyltriazine and isophorone. The isocyanate groups in diisocyanate react with the hydroxyl groups in polyethylene glycol and thiazole-piperazinyltriazine to obtain thiazole-piperazinyltriazine modified polyurethane. Thiazole-piperazinyltriazine contains multiple hydroxyl groups, which can improve the degree of crosslinking, thereby increasing the density of the coating and enhancing its corrosion resistance and wear resistance. The polyurethane matrix itself has excellent wear resistance. After introducing triazine rings, thiazole, and piperazine heterocyclic structures, the rigidity of the heterocycles can improve the coating's hardness and scratch resistance, reduce the propagation of microcracks, and provide chemical stability, thus improving the coating's corrosion resistance. Corrosion-resistant and wear-resistant coatings can greatly improve the durability of armature cores and prevent them from being rapidly corroded and damaged by environmental factors. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0029] This embodiment describes a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: 0.05 mol of 6-amino-1H-quinazolin-4-one and 100 mL of tetrahydrofuran were added to a three-necked flask equipped with a thermometer and a mechanical stirrer. Nitrogen gas was introduced for protection, and the mixture was transferred to an ice bath. 8 mL of triethylamine was added, and 50 mL of cyanochlorotetrahydrofuran solution was added dropwise. The mixture was stirred for 1 h, heated to 24 °C and reacted for 2 h, then heated to 80 °C and stirred for 6 h. Tetrahydrofuran and triethylamine were removed by rotary evaporation. The mixture was added to 150 mL of dichloromethane and extracted successively with deionized water and saturated sodium chloride solution. Deionized water was removed with a molecular sieve, and dichloromethane was removed by rotary evaporation at 40 °C. The mixture was dried to obtain the first intermediate. Step A2: 34.2 mmol of the first intermediate and 50 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a mechanical stirrer, thermometer and reflux condenser. The mixture was stirred for 10 min, then 12 mL of thionyl chloride and 1 mL of N,N-dimethylformamide were added. The mixture was heated to reflux and reacted for 6 h. The 1,2-dichloroethane, thionyl chloride and N,N-dimethylformamide were removed by vacuum distillation. The mixture was washed three times with deionized water and saturated sodium chloride solution, dried with anhydrous sodium sulfate, concentrated the organic phase and recrystallized with petroleum ether to obtain the second intermediate. Step A3: Add 30.4 mmol of the second intermediate, 45.6 mmol of piperazine, and 150 mL of anhydrous ethanol to a two-necked flask equipped with a thermometer and a reflux condenser. Heat to reflux and react for 3 h. Concentrate under reduced pressure, add 150 mL of saturated saline solution, filter, extract and concentrate the filtrate with dichloromethane, purify with a methanol-dichloromethane mixture, and dry to obtain the third intermediate. Step A4: 2.2 mmol of 3,5-dihydroxyacetophenone, 2.4 mmol of N-bromosuccinimide, 50 mL of dichloromethane, 0.22 mmol of acetic acid, and 5 mL of anhydrous ethanol were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. The mixture was stirred for 10 min and reacted at 0 °C for 2 h. The temperature was then raised to 24 °C and stirred for 4 h. After filtration, the residue was washed with saturated brine. The organic phase was concentrated and added to a single-necked flask equipped with a reflux condenser with 2.2 mmol of thiourea, 10 mL of ethanol, and 10 mg of iodine. The mixture was refluxed for 4 h. After concentration, the mixture was filtered to obtain the fourth intermediate. Step A5: Add 2 mmol of the fourth intermediate and 8 mL of N,N-dimethylformamide to a two-necked flask equipped with a mechanical stirrer, stir for 5 min, add 2.2 mmol of chloroacetyl chloride dropwise at 0 °C, heat to 25 °C and react for 2 h, add to 100 mL of ice water and stir for 1 h, filter, wash the residue with deionized water and dry to obtain the fifth intermediate; Step A6: Add 1.5 mmol of the third intermediate, 1.5 mmol of the fifth intermediate, 10 mL of N,N-dimethylformamide and 1.8 mmol of anhydrous potassium carbonate to a three-necked flask equipped with a thermometer and a mechanical stirrer. React at 40 °C for 6 h. Add 100 mL of deionized water and stir for 30 min. Filter and separate the residue with a methanol-dichloromethane mixture. Dry to obtain thiazolium-piperazinyltriazine. Step A7: Add 0.0252 mol isophorone diisocyanate, 0.09 g dibutyltin dilaurate, and 50 mL tetrahydrofuran to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Purge with nitrogen for 30 min, add 200 mL polyethylene glycol-tetrahydrofuran solution dropwise, and react at 80 °C for 2 h. Add 0.0084 mol thiazole-piperazinyltriazine and react at 80 °C for 2 h. Purify by column chromatography with petroleum ether, precipitate three times, and then evaporate the precipitate by rotary evaporation to obtain thiazole-piperazinyltriazine modified polyurethane. Step A8: Weigh out 50 parts by weight of waterborne epoxy resin emulsion, 20 parts by weight of styrene-acrylic emulsion, 25 parts by weight of thiazole-piperazinyltriazine modified polyurethane, 5 parts by weight of silicon nitride, 3 parts by weight of graphene, 3 parts by weight of sodium pyrophosphate, 3 parts by weight of ethylenediamine, 0.5 parts by weight of sodium stannate, and 50 parts by weight of water, and set aside for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A9: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, thiazole-piperazinyltriazine modified polyurethane and water at 500 r / min for 20 min, add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 500 r / min for 30 min to obtain a mixture. Step A10: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm. Example 2:

[0030] This embodiment describes a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: 0.075 mol of 6-amino-1H-quinazolin-4-one and 150 mL of tetrahydrofuran were added to a three-necked flask equipped with a thermometer and a mechanical stirrer. Nitrogen gas was introduced for protection, and the mixture was transferred to an ice bath. 12 mL of triethylamine was added, and 75 mL of cyanochlorotetrahydrofuran solution was added dropwise. The mixture was stirred for 1 h, heated to 25 °C and reacted for 2 h, then heated to 80 °C and stirred for 7 h. Tetrahydrofuran and triethylamine were removed by rotary evaporation. The mixture was added to 225 mL of dichloromethane and extracted successively with deionized water and saturated sodium chloride solution. Deionized water was removed with a molecular sieve, and dichloromethane was removed by rotary evaporation at 40 °C. The mixture was dried to obtain the first intermediate. Step A2: 51.3 mmol of the first intermediate and 75 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a mechanical stirrer, thermometer and reflux condenser. The mixture was stirred for 13 min, then 18 mL of thionyl chloride and 1.5 mL of N,N-dimethylformamide were added. The mixture was heated to reflux and reacted for 6 h. The 1,2-dichloroethane, thionyl chloride and N,N-dimethylformamide were removed by vacuum distillation. The mixture was washed three times with deionized water and saturated sodium chloride solution, dried with anhydrous sodium sulfate, concentrated the organic phase and recrystallized with petroleum ether to obtain the second intermediate. Step A3: Add 45.6 mmol of the second intermediate, 68.4 mmol of piperazine, and 225 mL of anhydrous ethanol to a two-necked flask equipped with a thermometer and a reflux condenser. Heat to reflux and react for 3 h. Concentrate under reduced pressure, add 225 mL of saturated saline solution, filter, extract and concentrate the filtrate with dichloromethane, purify with a methanol-dichloromethane mixture, and dry to obtain the third intermediate. Step A4: 3.3 mmol of 3,5-dihydroxyacetophenone, 3.6 mmol of N-bromosuccinimide, 75 mL of dichloromethane, 0.33 mmol of acetic acid, and 7 mL of anhydrous ethanol were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. The mixture was stirred for 15 min and reacted at 3 °C for 2.5 h. The temperature was then raised to 25 °C and stirred for 4 h. After filtration, the residue was washed with saturated brine. The organic phase was concentrated and added to a single-necked flask equipped with a reflux condenser with 3.3 mmol of thiourea, 15 mL of ethanol, and 15 mg of iodine. The mixture was refluxed for 4 h. After concentration, the mixture was filtered to obtain the fourth intermediate. Step A5: Add 3 mmol of the fourth intermediate and 12 mL of N,N-dimethylformamide to a two-necked flask equipped with a mechanical stirrer, stir for 7 min, add 3.3 mmol of chloroacetyl chloride dropwise at 3 °C, heat to 27 °C and react for 2.5 h, add to 150 mL of ice water and stir for 1 h, filter, wash the residue with deionized water and dry to obtain the fifth intermediate; Step A6: Add 2.25 mmol of the third intermediate, 2.25 mmol of the fifth intermediate, 15 mL of N,N-dimethylformamide and 2.7 mmol of anhydrous potassium carbonate to a three-necked flask equipped with a thermometer and a mechanical stirrer. React at 45 °C for 7 h. Add 150 mL of deionized water and stir for 30 min. Filter and separate the residue with a methanol-dichloromethane mixture. Dry to obtain thiazolium-piperazinyltriazine. Step A7: Add 0.0378 mol isophorone diisocyanate, 0.135 g dibutyltin dilaurate, and 75 mL tetrahydrofuran to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Purge with nitrogen for 30 min, add 300 mL polyethylene glycol-tetrahydrofuran solution dropwise, and react at 80 °C for 2.5 h. Add 0.0126 mol thiazole-piperazinyltriazine and react at 80 °C for 2.5 h. Purify by column chromatography with petroleum ether, precipitate three times, and then evaporate the precipitate by rotary evaporation to obtain thiazole-piperazinyltriazine modified polyurethane. Step A8: Weigh out 62.5 parts by weight of waterborne epoxy resin emulsion, 30 parts by weight of styrene-acrylic emulsion, 27.5 parts by weight of thiazole-piperazinyltriazine modified polyurethane, 6 parts by weight of silicon nitride, 4 parts by weight of graphene, 4 parts by weight of sodium pyrophosphate, 4 parts by weight of ethylenediamine, 0.85 parts by weight of sodium stannate, and 75 parts by weight of water, and set aside for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A9: The aqueous epoxy resin emulsion, styrene-acrylic emulsion, thiazole-piperazinyltriazine modified polyurethane and water are stirred at 650 r / min for 25 min. Silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate are added and stirred at 650 r / min for 35 min to obtain a mixture. Step A10: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm. Example 3:

[0031] This embodiment describes a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: 0.1 mol of 6-amino-1H-quinazolin-4-one and 200 mL of tetrahydrofuran were added to a three-necked flask equipped with a thermometer and a mechanical stirrer. Nitrogen gas was introduced for protection, and the mixture was transferred to an ice bath. 16 mL of triethylamine was added, and 100 mL of cyanochlorotetrahydrofuran solution was added dropwise. The mixture was stirred for 1 h, heated to 26 °C and reacted for 2 h, then heated to 80 °C and stirred for 8 h. Tetrahydrofuran and triethylamine were removed by rotary evaporation. The mixture was added to 300 mL of dichloromethane and extracted successively with deionized water and saturated sodium chloride solution. Deionized water was removed with a molecular sieve, and dichloromethane was removed by rotary evaporation at 40 °C. The mixture was dried to obtain the first intermediate. Step A2: 68.4 mmol of the first intermediate and 100 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a mechanical stirrer, thermometer and reflux condenser. The mixture was stirred for 15 min, then 24 mL of thionyl chloride and 2 mL of N,N-dimethylformamide were added. The mixture was heated to reflux and reacted for 6 h. The 1,2-dichloroethane, thionyl chloride and N,N-dimethylformamide were removed by vacuum distillation. The mixture was washed three times with deionized water and saturated sodium chloride solution, dried with anhydrous sodium sulfate, concentrated the organic phase and recrystallized with petroleum ether to obtain the second intermediate. Step A3: Add 60.8 mmol of the second intermediate, 91.2 mmol of piperazine, and 300 mL of anhydrous ethanol to a two-necked flask equipped with a thermometer and a reflux condenser. Heat to reflux and react for 3 h. Concentrate under reduced pressure, add 300 mL of saturated saline solution, filter, extract and concentrate the filtrate with dichloromethane, purify with a methanol-dichloromethane mixture, and dry to obtain the third intermediate. Step A4: 4.4 mmol of 3,5-dihydroxyacetophenone, 4.8 mmol of N-bromosuccinimide, 100 mL of dichloromethane, 0.44 mmol of acetic acid, and 10 mL of anhydrous ethanol were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. The mixture was stirred for 20 min, reacted at 5 °C for 3 h, heated to 26 °C and stirred for 4 h. After filtration, the residue was washed with saturated brine, the organic phase was concentrated, and then added to a single-necked flask equipped with a reflux condenser with 4.4 mmol of thiourea, 20 mL of ethanol, and 20 mg of iodine. The mixture was refluxed for 4 h, concentrated, and then filtered to obtain the fourth intermediate. Step A5: Add 4 mmol of the fourth intermediate and 16 mL of N,N-dimethylformamide to a two-necked flask equipped with a mechanical stirrer, stir for 10 min, add 4.4 mmol of chloroacetyl chloride dropwise at 5 °C, heat to 30 °C and react for 3 h, add to 200 mL of ice water and stir for 1 h, filter, wash the residue with deionized water and dry to obtain the fifth intermediate; Step A6: Add 3 mmol of the third intermediate, 3 mmol of the fifth intermediate, 20 mL of N,N-dimethylformamide and 3.6 mmol of anhydrous potassium carbonate to a three-necked flask equipped with a thermometer and a mechanical stirrer. React at 50 °C for 8 h. Add 200 mL of deionized water and stir for 30 min. Filter and separate the residue with a methanol-dichloromethane mixture. Dry to obtain thiazolium-piperazinyltriazine. Step A7: Add 0.0504 mol isophorone diisocyanate, 0.18 g dibutyltin dilaurate, and 100 mL tetrahydrofuran to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Purge with nitrogen for 30 min, add 400 mL polyethylene glycol-tetrahydrofuran solution dropwise, and react at 80 °C for 3 h. Add 0.0168 mol thiazole-piperazinyltriazine and react at 80 °C for 3 h. Purify by column chromatography with petroleum ether, precipitate three times, and then evaporate the precipitate by rotary evaporation to obtain thiazole-piperazinyltriazine modified polyurethane. Step A8: Weigh out 75 parts by weight of waterborne epoxy resin emulsion, 40 parts by weight of styrene-acrylic emulsion, 30 parts by weight of thiazole-piperazinyltriazine modified polyurethane, 7 parts by weight of silicon nitride, 5 parts by weight of graphene, 5 parts by weight of sodium pyrophosphate, 5 parts by weight of ethylenediamine, 1.2 parts by weight of sodium stannate, and 100 parts by weight of water for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A9: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, thiazole-piperazinyltriazine modified polyurethane and water at 800 r / min for 30 min, add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 800 r / min for 40 min to obtain a mixture. Step A10: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0032] Comparative Example 1: This comparative example illustrates a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: 0.1 mol of 6-amino-1H-quinazolin-4-one and 200 mL of tetrahydrofuran were added to a three-necked flask equipped with a thermometer and a mechanical stirrer. Nitrogen gas was introduced for protection, and the mixture was transferred to an ice bath. 16 mL of triethylamine was added, and 100 mL of cyanochlorotetrahydrofuran solution was added dropwise. The mixture was stirred for 1 h, heated to 26 °C and reacted for 2 h, then heated to 80 °C and stirred for 8 h. Tetrahydrofuran and triethylamine were removed by rotary evaporation. The mixture was added to 300 mL of dichloromethane and extracted successively with deionized water and saturated sodium chloride solution. Deionized water was removed with a molecular sieve, and dichloromethane was removed by rotary evaporation at 40 °C. The mixture was dried to obtain the first intermediate. Step A2: 4.4 mmol of 3,5-dihydroxyacetophenone, 4.8 mmol of N-bromosuccinimide, 100 mL of dichloromethane, 0.44 mmol of acetic acid, and 10 mL of anhydrous ethanol were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. The mixture was stirred for 20 min, reacted at 5 °C for 3 h, and then heated to 26 °C and stirred for 4 h. After filtration, the residue was washed with saturated brine, the organic phase was concentrated, and then added to a single-necked flask equipped with a reflux condenser with 4.4 mmol of thiourea, 20 mL of ethanol, and 20 mg of iodine. The mixture was refluxed for 4 h, concentrated, and then filtered to obtain the fourth intermediate. Step A3: Add 4 mmol of the fourth intermediate and 16 mL of N,N-dimethylformamide to a two-necked flask equipped with a mechanical stirrer, stir for 10 min, add 4.4 mmol of chloroacetyl chloride dropwise at 5 °C, heat to 30 °C and react for 3 h, add to 200 mL of ice water and stir for 1 h, filter, wash the residue with deionized water and dry to obtain the fifth intermediate; Step A4: Add 3 mmol of the first intermediate, 3 mmol of the fifth intermediate, 20 mL of N,N-dimethylformamide and 3.6 mmol of anhydrous potassium carbonate to a three-necked flask equipped with a thermometer and a mechanical stirrer. React at 50 °C for 8 h. Add 200 mL of deionized water and stir for 30 min. Filter and separate the residue with a methanol-dichloromethane mixture. Dry to obtain thiazolium-quinazolinyl triazine. Step A5: Add 0.0504 mol isophorone diisocyanate, 0.18 g dibutyltin dilaurate, and 100 mL tetrahydrofuran to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Purge with nitrogen for 30 min, add 400 mL polyethylene glycol-tetrahydrofuran solution dropwise, and react at 80 °C for 3 h. Add 0.0168 mol thiazole-quinazoline triazine and react at 80 °C for 3 h. Purify by column chromatography with petroleum ether, precipitate three times, and then evaporate the precipitate by rotary evaporation to obtain thiazole-quinazoline triazine modified polyurethane. Step A6: Weigh out 75 parts by weight of waterborne epoxy resin emulsion, 40 parts by weight of styrene-acrylic emulsion, 30 parts by weight of thiazole-quinazolinyl triazine modified polyurethane, 7 parts by weight of silicon nitride, 5 parts by weight of graphene, 5 parts by weight of sodium pyrophosphate, 5 parts by weight of ethylenediamine, 1.2 parts by weight of sodium stannate, and 100 parts by weight of water, and set aside for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A7: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, thiazole-quinazolinyl triazine modified polyurethane and water at 800 r / min for 30 min, add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 800 r / min for 40 min to obtain a mixture. Step A8: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0033] Comparative Example 2: This comparative example illustrates a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: 0.1 mol of 2-amino-4-hydroxymethylthiazole and 200 mL of tetrahydrofuran were added to a three-necked flask equipped with a thermometer and a mechanical stirrer. Nitrogen gas was introduced for protection, and the mixture was transferred to an ice bath. 16 mL of triethylamine was added, and 100 mL of cyanochlorotetrahydrofuran solution was added dropwise. The mixture was stirred for 1 h, heated to 26 °C and reacted for 2 h, then heated to 80 °C and stirred for 8 h. Tetrahydrofuran and triethylamine were removed by rotary evaporation. The mixture was added to 300 mL of dichloromethane and extracted successively with deionized water and saturated sodium chloride solution. Deionized water was removed with a molecular sieve, and dichloromethane was removed by rotary evaporation at 40 °C. The mixture was dried to obtain the first intermediate. Step A2: 0.0252 mol of isophorone diisocyanate, 0.09 g of dibutyltin dilaurate, and 50 mL of tetrahydrofuran were added to a three-necked flask equipped with a mechanical stirrer, a reflux condenser, and a thermometer. Nitrogen gas was introduced for 30 min, and 200 mL of polyethylene glycol-tetrahydrofuran solution was added dropwise. The reaction was carried out at 80 °C for 3 h. 0.0168 mol of the first intermediate was added and the reaction was carried out at 80 °C for 3 h. The mixture was purified by column chromatography with petroleum ether, precipitated three times, and the precipitate was obtained by rotary evaporation to obtain thiazolyl triazine modified polyurethane. Step A3: Weigh out 75 parts by weight of waterborne epoxy resin emulsion, 40 parts by weight of styrene-acrylic emulsion, 30 parts by weight of thiazolyl triazine modified polyurethane, 7 parts by weight of silicon nitride, 5 parts by weight of graphene, 5 parts by weight of sodium pyrophosphate, 5 parts by weight of ethylenediamine, 1.2 parts by weight of sodium stannate, and 100 parts by weight of water, and set aside for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A4: The aqueous epoxy resin emulsion, styrene-acrylic emulsion, thiazolyl triazine modified polyurethane and water are stirred at 800 r / min for 30 min. Silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate are added and stirred at 800 r / min for 40 min to obtain a mixture. Step A5: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0034] Comparative Example 3: This comparative example illustrates a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: Add 0.1 mol 1-hydroxypiperazine and 200 mL tetrahydrofuran to a three-necked flask equipped with a thermometer and a mechanical stirrer. Purge with nitrogen for protection, transfer to an ice bath, add 16 mL triethylamine, add 100 mL cyanochloro-tetrahydrofuran solution dropwise, stir for 1 h, raise the temperature to 26 °C and react for 2 h, raise the temperature to 80 °C and stir for 8 h, remove tetrahydrofuran and triethylamine by rotary evaporation, add to 300 mL dichloromethane, extract with deionized water and saturated sodium chloride solution successively, remove deionized water with molecular sieve, remove dichloromethane by rotary evaporation at 40 °C, dry to obtain the first intermediate; Step A2: 0.0252 mol of isophorone diisocyanate, 0.09 g of dibutyltin dilaurate, and 50 mL of tetrahydrofuran were added to a three-necked flask equipped with a mechanical stirrer, reflux condenser, and thermometer. Nitrogen gas was introduced for 30 min, and 200 mL of polyethylene glycol-tetrahydrofuran solution was added dropwise. The reaction was carried out at 80 °C for 3 h. 0.0168 mol of the first intermediate was added and the reaction was carried out at 80 °C for 3 h. The mixture was purified by column chromatography with petroleum ether, precipitated three times, and the precipitate was obtained by rotary evaporation to obtain piperazine-triazine modified polyurethane. Step A3: Weigh out 75 parts by weight of waterborne epoxy resin emulsion, 40 parts by weight of styrene-acrylic emulsion, 30 parts by weight of piperazine-triazine modified polyurethane, 7 parts by weight of silicon nitride, 5 parts by weight of graphene, 5 parts by weight of sodium pyrophosphate, 5 parts by weight of ethylenediamine, 1.2 parts by weight of sodium stannate, and 100 parts by weight of water for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A4: The aqueous epoxy resin emulsion, styrene-acrylic emulsion, piperazine triazine modified polyurethane and water are stirred at 800 r / min for 30 min. Silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate are added and stirred at 800 r / min for 40 min to obtain a mixture. Step A5: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0035] Comparative Example 4: This comparative example illustrates a method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, comprising the following steps: Step A1: Add 0.1 mol of p-aminophenol and 200 mL of tetrahydrofuran to a three-necked flask equipped with a thermometer and a mechanical stirrer. Purge with nitrogen for protection, transfer to an ice bath, add 16 mL of triethylamine, add 100 mL of cyanochlorotetrahydrofuran solution dropwise, stir for 1 h, raise the temperature to 26 °C and react for 2 h, raise the temperature to 80 °C and stir for 8 h, remove tetrahydrofuran and triethylamine by rotary evaporation, add to 300 mL of dichloromethane, extract with deionized water and saturated sodium chloride solution successively, remove deionized water with molecular sieve, remove dichloromethane by rotary evaporation at 40 °C, dry to obtain the first intermediate; Step A2: 0.0252 mol of isophorone diisocyanate, 0.09 g of dibutyltin dilaurate and 50 mL of tetrahydrofuran were added to a three-necked flask equipped with a mechanical stirrer, reflux condenser and thermometer. Nitrogen gas was introduced for 30 min, 200 mL of polyethylene glycol-tetrahydrofuran solution was added dropwise and reacted at 80 °C for 3 h. 0.0168 mol of the first intermediate was added and reacted at 80 °C for 3 h. The mixture was purified by column chromatography with petroleum ether, precipitated 3 times, and the precipitate was obtained by rotary evaporation to obtain triazine modified polyurethane. Step A3: Weigh out 75 parts by weight of waterborne epoxy resin emulsion, 40 parts by weight of styrene-acrylic emulsion, 30 parts by weight of triazine-modified polyurethane, 7 parts by weight of silicon nitride, 5 parts by weight of graphene, 5 parts by weight of sodium pyrophosphate, 5 parts by weight of ethylenediamine, 1.2 parts by weight of sodium stannate, and 100 parts by weight of water for later use; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step A4: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, triazine-modified polyurethane and water at 800 r / min for 30 min, add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 800 r / min for 40 min to obtain a mixture. Step A5: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

[0036] Performance testing The wear-resistant and corrosion-resistant coatings of Examples 1-3 and Comparative Examples 1-4 were immersed in a 3.5% sodium chloride solution for 7 days, and the corrosion of the coatings was observed. The wear-resistant and anti-corrosion coatings of Examples 1-3 and Comparative Examples 1-4 were subjected to a 1000-rotation wear test using a Taber abrasion tester to measure the amount of wear on the coatings.

[0037]

[0038] Referring to the table above, based on the comparison between Examples 1-3 and Comparative Examples 1-4, it can be seen that the coating modified with thiazole-piperazinyltriazine has good wear resistance and corrosion resistance. Based on the comparison between Example 3 and Comparative Example 1, it can be seen that the wear amount of the coating modified with thiazole-piperazinyltriazine is less than that of the coating modified with thiazole-quinazolinyltriazine, indicating that the coating modified with thiazole-piperazinyltriazine has excellent wear resistance. Based on the comparison between Example 3 and Comparative Example 2, it can be seen that the wear amount of the coating with added thiazole-piperazine-triazine modified polyurethane is less than that of the coating with added thiazole-triazine modified polyurethane, indicating that the coating with added thiazole-piperazine-triazine modified polyurethane has excellent wear resistance. Based on the comparison between Example 3 and Comparative Example 3, it can be seen that the wear amount of the coating with added thiazole-piperazine-triazine modified polyurethane is less than that of the coating with added piperazine-triazine modified polyurethane, indicating that the coating with added thiazole-piperazine-triazine modified polyurethane has excellent wear resistance. Based on the comparison between Example 3 and Comparative Example 4, it can be seen that the wear amount of the coating with added thiazole-piperazinyltriazine modified polyurethane is less than that of the coating with added triazine modified polyurethane, indicating that the coating with added thiazole-piperazinyltriazine modified polyurethane has excellent wear resistance.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant and wear-resistant coating for the armature core of a shock absorber solenoid valve, characterized in that, Includes the following components by weight: The mixture comprises 50-75 parts of waterborne epoxy resin emulsion, 20-40 parts of styrene-acrylic emulsion, 25-30 parts of thiazole-piperazinyltriazine modified polyurethane, 5-7 parts of silicon nitride, 3-5 parts of graphene, 3-5 parts of sodium pyrophosphate, 3-5 parts of ethylenediamine, 0.5-1.2 parts of sodium stannate, and 50-100 parts of water. The thiazole-piperazinyltriazine modified polyurethane is prepared by the following steps: Step A1: Stir the solution of 6-amino-1H-quinazolin-4-one, tetrahydrofuran, triethylamine and melamine-tetrahydrofuran, extract with dichloromethane and dry to obtain the first intermediate; Step A2: Stir the first intermediate and 1,2-dichloroethane, add thionyl chloride and N,N-dimethylformamide and reflux to obtain the second intermediate; Step A3: Reflux the second intermediate, piperazine, and anhydrous ethanol, add saturated brine, and obtain the third intermediate; Step A4: Stir 3,5-dihydroxyacetophenone, N-bromosuccinimide, dichloromethane, acetic acid and anhydrous ethanol, and reflux with thiourea, ethanol and iodine to obtain the fourth intermediate; Step A5: Stir the fourth intermediate and N,N-dimethylformamide, add chloroacetyl chloride to react, add ice water and stir to obtain the fifth intermediate; Step A6: React the third intermediate, the fifth intermediate, N,N-dimethylformamide and anhydrous potassium carbonate, add deionized water and stir to obtain thiazolium-piperazinyltriazine; Step A7: React isophorone diisocyanate, dibutyltin dilaurate, tetrahydrofuran, polyethylene glycol-tetrahydrofuran solution and thiazole-piperazinyltriazine to obtain thiazole-piperazinyltriazine modified polyurethane.

2. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, In step A1, the ratio of 6-amino-1H-quinazolin-4-one, tetrahydrofuran, triethylamine, melamine chloride-tetrahydrofuran solution, and dichloromethane is 0.05-0.1 mol: 100-200 mL: 8-16 mL: 50-100 mL: 150-300 mL; the ratio of melamine chloride to tetrahydrofuran in the melamine chloride-tetrahydrofuran solution is 27.1-54.2 mmol: 50-100 mL.

3. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, In step A2, the ratio of the first intermediate, 1,2-dichloroethane, thionyl chloride, and N,N-dimethylformamide is 34.2-68.4 mmol: 50-100 mL: 12-24 mL: 1-2 mL.

4. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, In step A3, the ratio of the second intermediate, piperazine, anhydrous ethanol, and saturated saline is 30.4-60.8 mmol: 45.6-91.2 mmol: 150-300 mL: 150-300 mL.

5. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, The ratio of 3,5-dihydroxyacetophenone, N-bromosuccinimide, dichloromethane, acetic acid, anhydrous ethanol, thiourea, ethanol, and iodine used in step A4 is 2.2-4.4 mmol: 2.4-4.8 mmol: 50-100 mL: 0.22-0.44 mmol: 5-10 mL: 2.2-4.4 mmol: 10-20 mL: 10-20 mg.

6. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, The ratio of the fourth intermediate, N,N-dimethylformamide, chloroacetyl chloride, and ice water in step A5 is 2-4 mmol: 8-16 mL: 2.2-4.4 mmol: 100-200 mL.

7. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, The ratio of the third intermediate, the fifth intermediate, N,N-dimethylformamide, anhydrous potassium carbonate, and deionized water used in step A6 is 1.5-3 mmol: 1.5-3 mmol: 10-20 mL: 1.8-3.6 mmol: 100-200 mL.

8. The anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve according to claim 1, characterized in that, In step A7, the ratio of isophorone diisocyanate, dibutyltin dilaurate, tetrahydrofuran, polyethylene glycol-tetrahydrofuran solution, and thiazole-piperazinyl triazine is 0.0252-0.0504 mol : 0.09-0.18 g : 50-100 mL : 200-400 mL : 0.0084-0.0168 mol; the ratio of polyethylene glycol to tetrahydrofuran in the polyethylene glycol-tetrahydrofuran solution is 20-40 g : 200-400 mL; and the polyethylene glycol is of type PEG2000.

9. A method for preparing an anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve, characterized in that, The method for preparing the anti-corrosion and wear-resistant coating for the armature core of a shock absorber solenoid valve as described in any one of claims 1-8 comprises the following steps: Step 1: Weigh out 50-75 parts by weight of waterborne epoxy resin emulsion, 20-40 parts by weight of styrene-acrylic emulsion, 25-30 parts by weight of thiazole-piperazinyltriazine modified polyurethane, 5-7 parts by weight of silicon nitride, 3-5 parts by weight of graphene, 3-5 parts by weight of sodium pyrophosphate, 3-5 parts by weight of ethylenediamine, 0.5-1.2 parts by weight of sodium stannate, and 50-100 parts by weight of water, and set aside; wherein, the waterborne epoxy resin emulsion is of type AB-EP-20; the styrene-acrylic emulsion is of type SA-212; the silicon nitride has a particle size of 20 nm; and the graphene has a thickness of 0.9-1.2 nm and a diameter of 1-3 μm; Step 2: Stir the waterborne epoxy resin emulsion, styrene-acrylic emulsion, thiazole-piperazinyltriazine modified polyurethane and water at 500-800 r / min for 20-30 min, then add silicon nitride, graphene, sodium pyrophosphate, ethylenediamine and sodium stannate and stir at 500-800 r / min for 30-40 min to obtain a mixture. Step 3: Polish the armature core of the shock absorber solenoid valve with sandpaper, clean it with anhydrous ethanol and deionized water and dry it. Preheat it at 90℃ for 5 minutes and spray the mixture to obtain an anti-corrosion and wear-resistant coating for the armature core of the shock absorber solenoid valve. The coating thickness is 20-35μm.

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