A rust-proof and corrosion-resistant bracket for a washing machine motor and a preparation method thereof

Abstract

The present application relates to the field of metal surface coating film, disclose a kind of anti-rust corrosion-resistant washing machine motor support and preparation method thereof.The present application is designed to synthesize the coating film with anti-rust corrosion resistance, which is coated on the surface of stainless steel used in washing machine motor, and high-temperature curing is prepared to obtain the support with anti-rust corrosion resistance.The film of polyaniline electrochemically polymerized on stainless steel has passivation effect, which protects the stainless steel matrix to some extent, the coating film selects polyaniline and its derivatives as corrosion-resistant material on the basis of water-based epoxy resin as matrix resin, utilizes the hydrophobicity and barrier property of graphene, and reacts with polysaccharide after silane coupling agent grafting to obtain graphene dispersion liquid with stable dispersion performance, which is used as the corrosion-resistant component of water-based epoxy resin, and the washing machine motor support with anti-rust corrosion resistance is prepared after coating.

Description

Technical Field

[0001] This invention relates to the field of metal surface coatings, specifically to a rust-proof and corrosion-resistant support for a washing machine motor and its preparation method. Background Technology

[0002] Corrosion and protection of metals are critical issues that cannot be avoided in the process of modern industrial construction. Carbon steel has become a common base material in many fields due to its excellent mechanical properties and low price. However, carbon steel is extremely easy to oxidize, which leads to a significant decrease in its strength and toughness, affecting its performance. Therefore, rust prevention and corrosion resistance of carbon steel has become a primary issue in the industry.

[0003] Based on this problem, the present invention prepared two anti-corrosion coatings, which were then applied to the brackets of washing machine motors, resulting in coatings with good anti-corrosion performance. Graphene, as a novel material with a single-layer two-dimensional honeycomb lattice structure, possesses good strength and toughness, thus forming a robust barrier and increasing the diffusion path of corrosive media in polymer coatings. Utilizing the properties of graphene, it was reacted with polysaccharides to increase its dispersibility and compatibility with carbon steel materials. By using polyaniline derivatives with anti-corrosion properties as the main anti-corrosion material, a coating with good anti-corrosion properties was prepared. Summary of the Invention

[0004] The purpose of this invention is to provide a rust-proof and corrosion-resistant bracket for a washing machine motor and its manufacturing method, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] The preparation method of a rust-proof and corrosion-resistant bracket for a washing machine motor includes the following steps:

[0007] S1: Mix epoxy resin and triethylenetetramine, heat in a water bath to 40-50℃ and react for 30-40 minutes, add polyethylene glycol diglycidyl ether, heat to 60-70℃ and react for 2-3 hours, add deionized water to dilute and obtain water-based curing agent;

[0008] S2: Take the polysaccharide extract aqueous solution, mix it with cerium nitrate aqueous solution under nitrogen atmosphere, stir evenly, seal and react for 0.5-1h, add silane coupling agent, heat the system to 45-50℃, react for 24-30h, add hydroquinone aqueous solution, filter the precipitate, dry at 40-50℃, add graphene, sonicate for 2-3h to obtain dispersion;

[0009] S3: Mix hydrochloric acid, deionized water, and 2,3-dimethylaniline, stir well, add ferrous sulfate solution and carbon paper, heat to 40-45℃ and add hydrogen peroxide solution dropwise, react for 6-7 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline);

[0010] S4: Coating preparation:

[0011] (1) Take epoxy resin, dispersant, polyaniline, talc powder and cyclohexanone, mix them, stir evenly, and continue to add the prepared poly2,3-dimethylaniline, and stir for 1 to 1.5 hours;

[0012] (2) Add titanium dioxide and dispersion, stir evenly, grind, and filter;

[0013] (3) Take water-based curing agent, xylene and butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0014] S5: Take stainless steel and use it as the support material. First, apply a coating to the surface of the stainless steel substrate and cure it at high temperature to obtain a rust-proof and corrosion-resistant support for washing machine motors.

[0015] Ideally, in S1, the solid content of the water-based curing agent diluted with deionized water is 30-35%.

[0016] In an optimized manner, the mass ratio of epoxy resin, triethylenetetramine, and polyethylene glycol diglycidyl ether in S1 is 8:1:(1-1.2).

[0017] In an optimized manner, in S2, the polysaccharide extract is okra extract with an aqueous solution concentration of 2-5%, the cerium nitrate aqueous solution concentration is 1-1.5 mol / L, and the silane coupling agent is KH570.

[0018] In a more optimized form, S2 contains the following components by weight: 50-60 parts of polysaccharide extract aqueous solution, 40-50 parts of cerium nitrate aqueous solution, 10-20 parts of silane coupling agent, and 5-10 parts of graphene.

[0019] In a more optimized configuration, in S3, the hydrochloric acid solution concentration is 5–10%, the carbon paper size is 5 mm × 15 mm, and the hydrogen peroxide solution concentration is 10–15%.

[0020] In a more optimized form, S3 contains the following components by weight: 5-10 parts hydrochloric acid, 2-3 parts 2,3-dimethylaniline, 3-5 parts ferrous sulfate solution, and 10-12 parts hydrogen peroxide solution.

[0021] In a more optimized manner, in S4(1), the dispersant is 4310 dispersant.

[0022] In a more optimized form, S4 contains the following components by weight: 40-50 parts epoxy resin, 0.1-0.5 parts dispersant, 2-3 parts polyaniline, 1-10 parts talc, 2-4 parts cyclohexanone, 1-5 parts poly-2,3-dimethylaniline, 1-10 parts titanium dioxide, 5-10 parts dispersion, 10-12 parts water-based curing agent, 4-6 parts xylene, and 1-2 parts butanol.

[0023] In an optimized version, the stainless steel material in S4 is 304.

[0024] In a more optimized manner, in S4, the temperature is raised to 60-70°C for curing.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0026] (1) Using graphene as one of the components of the coating to improve the anti-corrosion performance of the coating; graphene has excellent anti-corrosion performance. Due to its ultra-high cross-linking density and unique layered structure, it ensures the penetration of corrosive factors and forms a new diffusion path for corrosive media; on this basis, the graphene is used to continue to react with the grafted polysaccharide to increase the reaction sites and ensure the anti-corrosion performance of the graphene-added coating; this invention selects okra polysaccharide extract, which ensures that it has good biocompatibility. At the same time, its surface contains a large number of hydroxyl groups. After the silane coupling agent is modified, a grafted product with anti-corrosion performance is prepared. It is used as a surface modification component to react with graphene. After being mixed with matrix resin and other components, a coating with excellent anti-corrosion performance is obtained.

[0027] (2) Using polyaniline derivatives as the main additive raw materials, it is mixed with waterborne epoxy resin and other additives. In this invention, poly2,3-dimethylaniline is selected. The methyl group on the benzene ring can ensure its good dispersion performance in epoxy resin, and the anti-corrosion performance of the prepared coating film can be effectively exerted.

[0028] (3) A water-based curing agent was prepared, which shortened the drying time while ensuring effective curing, ensuring the bonding strength between the coating and carbon steel, improving the water resistance of the system, and enhancing the corrosion resistance of the coating. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The manufacturing method of the bracket for the washing machine motor used for rust and corrosion prevention includes the following chemicals:

[0031] Carbon paper: Model: CF-CP, Jiaxing Nako New Materials Co., Ltd.; Epoxy resin: Item No.: LJ072107, Langfang Lanjia Anticorrosion Materials Co., Ltd.; Polyethylene glycol diglycidyl ether: Model: DW3432, Wuhan Huaxiang Kejie Biotechnology Co., Ltd.; Dispersant: Model: BASF EFKA PX4310, Suzhou Jingyan New Materials Co., Ltd.; Polyaniline: Item No.: lnb-1109, Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; Talc powder: Particle size: 200-1250, Shijiazhuang Chenjin Mineral Products Co., Ltd.; Polysaccharide extract: Mesh size: 80-100, Shaanxi Junhe Biotechnology Co., Ltd.; Silane coupling agent: Model: KH-570, Dongguan Changhe Chemical Co., Ltd.; Graphene: Model: W03, Dongguan Chunliang Craft Materials Co., Ltd.; Stainless steel: Specifications: Thickness: 0.8~8.0mm, Material: 304, Zhejiang Guorui Steel Co., Ltd.

[0032] Example 1:

[0033] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0034] S2: Take 50 parts of polysaccharide extract aqueous solution, mix it with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 10 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃ constant temperature.

[0035] S3: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0036] S4: Mix 8 parts hydrochloric acid, deionized water and 3 parts 2,3-dimethylaniline, stir well and then add 4 parts ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts hydrogen peroxide solution dropwise. After reacting for 6 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0037] S5: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc, and 4 parts cyclohexanone, mix them, stir evenly, and then add 3 parts poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0038] S6: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0039] S7: Take 10 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0040] S8: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0041] Example 2:

[0042] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0043] S2: Take 50 parts of polysaccharide extract aqueous solution, mix with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 5 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃.

[0044] S3: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0045] S4: Mix 8 parts hydrochloric acid, deionized water and 3 parts 2,3-dimethylaniline, stir well and then add 4 parts ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts hydrogen peroxide solution dropwise. After reacting for 6 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0046] S5: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc, and 4 parts cyclohexanone, mix them, stir evenly, and then add 3 parts poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0047] S6: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0048] S7: Take 10 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0049] S8: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0050] Example 3:

[0051] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0052] S2: Take 50 parts of polysaccharide extract aqueous solution, mix it with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 10 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃ constant temperature.

[0053] S3: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0054] S4: Mix 8 parts hydrochloric acid, deionized water and 3 parts 2,3-dimethylaniline, stir well and then add 4 parts ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts hydrogen peroxide solution dropwise. After reacting for 6 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0055] S5: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc, and 4 parts cyclohexanone, mix them, stir evenly, and then add 3 parts poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0056] S6: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0057] S7: Take 5 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0058] S8: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0059] Example 4:

[0060] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0061] S2: Take 50 parts of polysaccharide extract aqueous solution, mix it with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 10 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃ constant temperature.

[0062] S3: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0063] S4: Mix 8 parts hydrochloric acid, deionized water and 3 parts 2,3-dimethylaniline, stir well and then add 4 parts ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts hydrogen peroxide solution dropwise. After reacting for 6 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0064] S5: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc, and 4 parts cyclohexanone, mix them, stir evenly, and then add 1 part poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0065] S6: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0066] S7: Take 10 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0067] S8: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0068] Comparative Example 1: The preparation of the water-based curing agent was omitted, and triethylenetetramine was used as the curing agent. All other conditions remained the same as in Example 1.

[0069] S1: Take 50 parts of polysaccharide extract aqueous solution, mix it with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 10 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃.

[0070] S2: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0071] S3: Take 8 parts of hydrochloric acid, deionized water and 3 parts of 2,3-dimethylaniline and mix them. After stirring evenly, add 4 parts of ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts of hydrogen peroxide solution dropwise. After reacting for 6 hours, take out the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0072] S4: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc powder, and 4 parts cyclohexanone, mix them, stir evenly, and then add 3 parts poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0073] S5: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0074] S6: Take 10 parts of triethylenetetramine, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0075] S7: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0076] Comparative Example 2: The modification step of the polysaccharide extract with the silane coupling agent was omitted, and the remaining conditions were kept the same as in Example 1:

[0077] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0078] S2: 50 parts of polysaccharide extract aqueous solution and 8 parts of graphene were mixed and stirred, and sonicated for 2 hours to obtain a dispersion.

[0079] S3: Take 8 parts of hydrochloric acid, deionized water and 3 parts of 2,3-dimethylaniline and mix them. After stirring evenly, add 4 parts of ferrous sulfate solution and carbon paper. Heat to 40℃ and add 10 parts of hydrogen peroxide solution dropwise. After reacting for 6 hours, take out the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline).

[0080] S4: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc powder, and 4 parts cyclohexanone, mix them, stir evenly, and then add 3 parts poly2,3-dimethylaniline. Stir for 1.5 hours at 3000 rad / min.

[0081] S5: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0082] S6: Take 10 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0083] S7: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0084] Comparative Example 3: The modification step of epoxy resin by poly(2,3-dimethylaniline) was omitted, and the remaining conditions were kept the same as in Example 1:

[0085] S1: Mix 16 parts epoxy resin and 2 parts triethylenetetramine, heat in a water bath to 40°C and react for 30 minutes, add 2 parts polyethylene glycol diglycidyl ether, heat to 60°C and react for 2.5 hours, add deionized water to dilute and obtain water-based curing agent;

[0086] S2: Take 50 parts of polysaccharide extract aqueous solution, mix it with 50 parts of cerium nitrate aqueous solution under nitrogen atmosphere protection, stir evenly and seal to react for 0.5h, add 10 parts of silane coupling agent, heat the system to 45℃, react for 24h, add hydroquinone aqueous solution, filter the precipitate, and dry at 40℃ constant temperature.

[0087] S3: Take the dried product obtained from the preparation, dissolve it in deionized water and disperse it, add 8 parts of graphene, and sonicate for 2 hours to obtain a dispersion;

[0088] S4: Take 40 parts epoxy resin, 0.3 parts dispersant, 2 parts polyaniline, 5 parts talc powder, and 4 parts cyclohexanone, mix them, stir evenly, add 3 parts 2,3-dimethylaniline, and stir for 1.5 hours at 3000 rad / min.

[0089] S5: Add 5 parts titanium dioxide and 5 parts dispersion, stir evenly, grind, and filter;

[0090] S6: Take 10 parts of water-based curing agent, 5 parts of xylene, and 2 parts of butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film;

[0091] S7: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at 60°C to obtain a rust-proof and corrosion-resistant bracket for washing machine motors.

[0092] Experiment: (1) Neutral salt spray resistance test was conducted according to standard GB / T 1771-2007. A cut of 0.3mm to 1.0mm was made in the center of the coated stainless steel plate and placed in the salt spray chamber. A sodium chloride solution with a mass concentration of (50±5)g / L was used for testing and the foaming time was observed.

[0093] (2) Adhesion tests were conducted on the paint film according to standard GB / T 1720-1979. Stainless steel plates were cut into pieces of 50mm × 100mm × 0.2~0.3mm. The prepared coating film was applied, with a width of 25~35mm. A 200g weight was used. After high-temperature curing and complete drying, a circular arc was drawn on the steel plate using an adhesion tester. The scratches were inspected and rated. The obtained data are shown in the table below:

[0094] Table 1 Performance Test Data

[0095]

[0096]

[0097] Conclusion: By comparing the data in Table 1, it can be seen that the stainless steel prepared in Example 1 has good corrosion resistance, indicating that the stainless steel prepared by the present invention has good rust prevention and corrosion resistance. The product data obtained from the other examples show that the component dosage and reaction time should be based on the conditions given in the present invention.

[0098] The comparative analysis shows that the modification steps of the curing agent and silane coupling agent, as well as the polymer-modified epoxy resin, are important factors affecting the rust and corrosion resistance performance.

[0099] In summary, the stainless steel coating prepared by this invention has good rust and corrosion resistance.

[0100] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor, characterized in that: The steps are as follows: S1: Mix epoxy resin and triethylenetetramine, heat in a water bath to 40-50℃ and react for 30-40 minutes, add polyethylene glycol diglycidyl ether, heat to 60-70℃ and react for 2-3 hours, add deionized water to dilute and obtain water-based curing agent. S2: Take the polysaccharide extract aqueous solution, mix it with cerium nitrate aqueous solution under nitrogen atmosphere, stir evenly, seal and react for 0.5~1h, add silane coupling agent, heat the system to 45~50℃, react for 24~30h, add hydroquinone aqueous solution, filter the precipitate, dry at 40~50℃, add graphene, sonicate for 2~3h to obtain dispersion; S3: Mix hydrochloric acid, deionized water, and 2,3-dimethylaniline, stir well, add ferrous sulfate solution and carbon paper, heat to 40-45℃ and add hydrogen peroxide solution dropwise, react for 6-7 hours, remove the carbon paper, filter, wash, dry and grind to obtain poly(2,3-dimethylaniline); S4: Coating preparation: (1) Take epoxy resin, dispersant, polyaniline, talc powder and cyclohexanone, mix them, stir evenly, and continue to add the prepared poly2,3-dimethylaniline, stir for 1~1.5h; (2) Add titanium dioxide and the prepared dispersion, stir evenly, grind, and filter; (3) Take water-based curing agent, xylene and butanol, mix them evenly, add the filtered product and mix evenly to obtain a coating film; S5: Take stainless steel and use it as the bracket material. First, apply a coating to the surface of the stainless steel substrate and cure it at high temperature to obtain a rust-proof and corrosion-resistant bracket for washing machine motors. In S2, the polysaccharide extract is okra extract, and its aqueous solution has a concentration of 2-5%. The concentration of the cerium nitrate aqueous solution is 1-1.5 mol / L, and the silane coupling agent is KH570.

2. The method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor according to claim 1, characterized in that: In S1, the solid content of the water-based curing agent after dilution with deionized water is 30-35%.

3. The method for preparing a rust-proof and corrosion-resistant support for a washing machine motor according to claim 1, characterized in that: In S1, the mass ratio of epoxy resin, triethylenetetramine, and polyethylene glycol diglycidyl ether is 8:1:(1~1.2).

4. The method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor according to claim 1, characterized in that: S2 contains the following components by weight: 50-60 parts of polysaccharide extract aqueous solution, 40-50 parts of cerium nitrate aqueous solution, 10-20 parts of silane coupling agent, and 5-10 parts of graphene.

5. The method for preparing a rust-proof and corrosion-resistant support for a washing machine motor according to claim 1, characterized in that: In S3, the hydrochloric acid solution concentration is 5~10%, the carbon paper size is 5mm×15mm, and the hydrogen peroxide solution concentration is 10~15%.

6. The method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor according to claim 1, characterized in that: S3 contains the following components by weight: 5-10 parts hydrochloric acid, 2-3 parts 2,3-dimethylaniline, 3-5 parts ferrous sulfate solution, and 10-12 parts hydrogen peroxide solution.

7. The method for preparing a rust-proof and corrosion-resistant support for a washing machine motor according to claim 1, characterized in that: In S4(1), the dispersant is 4310 dispersant.

8. The method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor according to claim 1, characterized in that: S4 contains the following components by weight: 40-50 parts epoxy resin, 0.1-0.5 parts dispersant, 2-3 parts polyaniline, 1-10 parts talc, 2-4 parts cyclohexanone, 1-5 parts poly-2,3-dimethylaniline, 1-10 parts titanium dioxide, 5-10 parts dispersion, 10-12 parts water-based curing agent, 4-6 parts xylene, and 1-2 parts butanol.

9. The method for preparing a rust-proof and corrosion-resistant bracket for a washing machine motor according to claim 1, characterized in that: In S5, the stainless steel material is 304, and it is cured by heating to 60~70℃.

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