Oily paint for stainless steel and aluminum materials, preparation method and application

Abstract

The present application relates to the field of coating technology, specifically disclosing an oil-based coating for stainless steel and aluminum-breaking materials, a preparation method, and applications. The oil-based coating for stainless steel and aluminum-breaking materials comprises the following components in parts by weight: 60-80 parts of epoxy resin, 8-15 parts of curing agent, 30-50 parts of organic solvent, 10-15 parts of nano-silicon dioxide, 5-10 parts of nano-titanium dioxide, 8-14 parts of halloysite nanotube-aluminum tripolyphosphate complex, 12-21 parts of lignin nanospheres, 2-4 parts of dispersant, 1-3 parts of defoaming agent, and 2-4 parts of leveling agent. The oil-based coating prepared in the present application, which can be used on stainless steel and aluminum-breaking materials, has strong adhesion, good wear resistance, and good corrosion resistance.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to an oily coating for stainless steel and aluminum materials, a preparation method and application thereof. Background Art

[0002] At present, there are many types of oil-based paints on the market, but there are relatively few special paints for stainless steel and broken aluminum materials. Existing paints have deficiencies in adhesion, corrosion resistance, wear resistance, etc., and cannot meet the needs of high-end applications. Traditional oil-based paints usually use organic solvents as diluents and contain a large amount of volatile organic compounds (VOCs), which are harmful to the environment and human health. At the same time, the formula and process of existing paints make it difficult to form strong adhesion and excellent corrosion resistance on the surface of stainless steel and broken aluminum materials. Existing oil-based paints have deficiencies in environmental performance, adhesion and corrosion resistance, and cannot meet the high-end application needs of stainless steel and broken aluminum materials. Summary of the Invention

[0003] In order to solve at least one of the above technical problems, an oily coating for stainless steel and broken aluminum materials with strong adhesion, excellent wear resistance and corrosion resistance and environmental protection is developed. The present application provides an oily coating for stainless steel and broken aluminum materials, a preparation method and application.

[0004] On the one hand, the present application provides an oily coating for stainless steel and broken aluminum materials, comprising the following components by weight: 60-80 parts of epoxy resin, 8-15 parts of curing agent, 30-50 parts of organic solvent, 10-15 parts of nano-silicon dioxide, 5-10 parts of nano-titanium dioxide, 8-14 parts of halloysite nanotube-aluminum tripolyphosphate complex, 12-21 parts of lignin nanospheres, 2-4 parts of dispersant, 1-3 parts of defoaming agent, and 2-4 parts of leveling agent.

[0005] Through the above technical solution, this application uses epoxy resin as the base resin of the coating, which has good adhesion and corrosion resistance;

[0006] Nano-silica as a filler pigment can enhance the hardness and wear resistance of the coating, while improving the scratch resistance. Nano-sized silica can also improve the rheology and thixotropy of the coating;

[0007] Nano-titanium dioxide can provide hiding power and UV protection, while enhancing the weather resistance and anti-chalking ability of the coating. Titanium dioxide is also a common white pigment;

[0008] Lignin nanoparticles are derived from lignin in plant biomass and are a renewable biomass resource. Using lignin nanoparticles can improve the environmental friendliness of coatings. After nano-processing, they can act as a reinforcing agent to increase the overall hardness and density of the coating, thereby enhancing its ability to resist wear and tear, and may provide additional environmentally friendly properties.

[0009] The halloysite nanotube-aluminum tripolyphosphate composite can significantly improve the corrosion resistance of the coating. The halloysite nanotube has a hollow tubular structure that can act as a physical barrier to prevent corrosive media such as oxygen, moisture and electrolytes from penetrating into the substrate surface, thereby delaying the corrosion process. Aluminum tripolyphosphate, as a corrosion inhibitor, can decompose under corrosive conditions to produce phosphate ions. These ions can react with metal ions on the surface of the metal substrate to form a dense protective film, further blocking the corrosive media.

[0010] Optionally, the method for preparing the lignin nanospheres comprises the following steps:

[0011] A1. Mix enzymatically hydrolyzed lignin, γ-valerolactone, and ultrapure water, and ultrasonically disperse for 20-30 minutes to completely dissolve the lignin. Then, centrifuge at 7000-8000 rpm for 20-25 minutes, and collect the supernatant to prepare a lignin solution.

[0012] A2. injecting the prepared lignin solution into ultrapure water to prepare a lignin micro-nanosphere suspension;

[0013] A3. Add the lignin micro-nanosphere suspension into an autoclave, heat it at 160-180° C. for 10-12 hours, and then freeze-dry it to obtain the lignin nanospheres.

[0014] Optionally, in step A1, the weight ratio of the enzymatically hydrolyzed lignin, γ-valerolactone and ultrapure water is (20-25):(8-10):1; in step A2, the volume ratio of the lignin solution to ultrapure water is 1:(3-5).

[0015] Optionally, the preparation method of the halloysite nanotube-aluminum tripolyphosphate composite comprises the following steps:

[0016] B1. Adding a 3-5 mol / L hydrochloric acid solution to the halloysite nanotubes, heating and stirring the solution in a water bath for 4-6 hours, centrifuging, filtering, washing, and grinding to obtain hydrochloric acid-etched halloysite nanotubes;

[0017] B2, mixing the hydrochloric acid-etched halloysite nanotubes obtained in step B1, aluminum tripolyphosphate, and deionized water, ultrasonically dispersing the mixture for 40-60 minutes, and vacuum drying the resulting suspension;

[0018] B3. After vacuum drying, centrifugation is performed to separate the solid phase, and the solid phase is washed, dried, and ground into powder to obtain the halloysite nanotube-corrosion inhibitor composite.

[0019] Optionally, the weight ratio of the halloysite nanotubes to the hydrochloric acid solution in step B1 is (5-7):(60-80); the weight ratio of the aluminum tripolyphosphate and deionized water in step B2 to the halloysite nanotubes in step B1 is (6-8):(50-60):1.

[0020] Optionally, the weight ratio of the halloysite nanotube-aluminum tripolyphosphate composite to the lignin nanospheres is 1:(1-1.8).

[0021] Through the above technical solution, the present application defines the weight ratio between the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate composite, ensuring that the coating has excellent wear resistance and corrosion resistance.

[0022] Optionally, the curing agent is a modified amine curing agent; the organic solvent is butyl acetate; the dispersant is sodium lauryl sulfate; the defoaming agent is BYK024; and the leveling agent is a silicone leveling agent.

[0023] In a second aspect, the present application provides a method for preparing the oily coating for the above-mentioned stainless steel and aluminum materials, comprising the following steps:

[0024] S1, mixing the epoxy resin, organic solvent, defoamer and dispersant uniformly;

[0025] S2, adding the nano-silica, nano-titanium dioxide, lignin nano-microspheres and halloysite nanotube-aluminum tripolyphosphate complex, and stirring at a rotation speed of 700-800 rpm for 1-1.5 hours;

[0026] S3. Add the leveling agent and curing agent, and stir for 4-8 minutes at a rotation speed of 500-600 rpm to prepare the oil-based coating for stainless steel and aluminum materials.

[0027] Through the above technical solution, the oily coating for stainless steel and broken aluminum materials prepared in this application has excellent wear resistance and corrosion resistance, a simple preparation method, and is suitable for industrial production.

[0028] On the third aspect, the present application provides the application of the above-mentioned oily paint for stainless steel and broken aluminum materials in the field of preparing wear-resistant and anti-corrosion coatings. The oily paint for stainless steel and broken aluminum materials is coated on a pretreated substrate and dried to obtain an anti-corrosion and wear-resistant coating.

[0029] Through the above technical solution, the coating prepared in this application can form a coating with excellent wear resistance and corrosion resistance when applied on stainless steel and broken aluminum materials, with good adhesion, and can better provide protection for stainless steel and broken aluminum materials.

[0030] Optionally, the substrate is one of stainless steel and aluminum; the pretreatment includes degreasing, rust removal, and polishing; the drying temperature is 60-80° C., and the drying time is 1-1.5 hours.

[0031] In summary, the present invention includes at least one of the following beneficial technical effects:

[0032] 1. This application uses epoxy resin as the base resin of the coating, which has good adhesion and corrosion resistance; nano-silica is used as a filler pigment to enhance the hardness and wear resistance of the coating, while improving the scratch resistance. Nano-sized silica can also improve the rheology and thixotropy of the coating; nano-titanium dioxide can provide hiding power and UV protection, while enhancing the weather resistance and anti-powdering ability of the coating. Titanium dioxide is also a common white pigment; lignin nano-microspheres are derived from lignin in plant biomass, which is a renewable biomass resource. The use of lignin nano-microspheres can improve the environmental friendliness of the coating. After nano-processing, After treatment, it can act as a reinforcing agent to increase the overall hardness and density of the coating, thereby enhancing its ability to resist wear and may provide additional environmentally friendly properties; the halloysite nanotube-aluminum tripolyphosphate composite can significantly improve the corrosion resistance of the coating. The halloysite nanotube has a hollow tubular structure and can act as a physical barrier to prevent corrosive media such as oxygen, moisture and electrolytes from penetrating into the surface of the substrate, thereby delaying the corrosion process; aluminum tripolyphosphate, as a corrosion inhibitor, can decompose under corrosive conditions to produce phosphate ions. These ions can react with metal ions on the surface of the metal substrate to form a dense protective film to further block the corrosive media.

[0033] 2. The oily coating for stainless steel and aluminum materials prepared in this application has excellent wear resistance and corrosion resistance, a simple preparation method, and is suitable for industrial production.

[0034] 3. The coating prepared in this application can form a coating with excellent wear resistance and corrosion resistance when applied on stainless steel and broken aluminum materials, with good adhesion, and can better provide protection for stainless steel and broken aluminum materials. DETAILED DESCRIPTION

[0035] The present application is further described in detail below with reference to the embodiments.

[0036] Preparation Examples 1-3

[0037] Preparation Example 1

[0038] This preparation example provides a lignin nanoparticle, and the preparation method includes the following steps:

[0039] A1. Enzymatically hydrolyzed lignin, γ-valerolactone, and ultrapure water were mixed and ultrasonically dispersed for 20 minutes to completely dissolve the lignin. The mixture was then centrifuged at 8000 rpm for 20 minutes, and the supernatant was collected to prepare a lignin solution.

[0040] A2. injecting the prepared lignin solution into ultrapure water to prepare a lignin micro-nanosphere suspension;

[0041] A3. Add the lignin micro-nanosphere suspension into an autoclave, heat it at 160° C. for 12 hours, and then freeze-dry it to obtain the lignin nanospheres.

[0042] Wherein, in step A1, the weight ratio of the enzymatically hydrolyzed lignin, γ-valerolactone and ultrapure water is 20:10:1; and in step A2, the volume ratio of the lignin solution to ultrapure water is 1:3.

[0043] Preparation Example 2

[0044] This preparation example provides a lignin nanoparticle, and the preparation method includes the following steps:

[0045] A1. Enzymatically hydrolyzed lignin, γ-valerolactone, and ultrapure water were mixed and ultrasonically dispersed for 25 minutes to completely dissolve the lignin. The mixture was then centrifuged at 7500 rpm for 23 minutes, and the supernatant was collected to prepare a lignin solution.

[0046] A2. injecting the prepared lignin solution into ultrapure water to prepare a lignin micro-nanosphere suspension;

[0047] A3. Add the lignin micro-nanosphere suspension into an autoclave, heat it at 170° C. for 11 hours, and then freeze-dry it to obtain the lignin nanospheres.

[0048] Wherein, in step A1, the weight ratio of the enzymatically hydrolyzed lignin, γ-valerolactone and ultrapure water is 22:9:1; and in step A2, the volume ratio of the lignin solution to ultrapure water is 1:4.

[0049] Preparation Example 3

[0050] This preparation example provides a lignin nanoparticle, and the preparation method includes the following steps:

[0051] A1. Enzymatically hydrolyzed lignin, γ-valerolactone, and ultrapure water were mixed and ultrasonically dispersed for 30 minutes to completely dissolve the lignin. The mixture was then centrifuged at 7000 rpm for 25 minutes, and the supernatant was collected to prepare a lignin solution.

[0052] A2. injecting the prepared lignin solution into ultrapure water to prepare a lignin micro-nanosphere suspension;

[0053] A3. Add the lignin micro-nanosphere suspension into an autoclave, heat it at 180° C. for 10 h, and then freeze-dry it to obtain the lignin nanospheres.

[0054] Wherein, in step A1, the weight ratio of the enzymatically hydrolyzed lignin, γ-valerolactone and ultrapure water is 25:8:1; and in step A2, the volume ratio of the lignin solution to ultrapure water is 1:5.

[0055] Preparation Example 4

[0056] This preparation example provides a halloysite nanotube-aluminum tripolyphosphate composite, and the preparation method includes the following steps:

[0057] B1, adding a 4 mol / L hydrochloric acid solution to the halloysite nanotubes, heating and stirring in a water bath for 5 h, centrifuging, filtering, washing, and grinding to obtain hydrochloric acid-etched halloysite nanotubes;

[0058] B2, mixing the hydrochloric acid-etched halloysite nanotubes obtained in step B1, aluminum tripolyphosphate, and deionized water, ultrasonically dispersing the mixture for 50 minutes, and vacuum drying the resulting suspension;

[0059] B3. After vacuum drying, centrifugation is performed to separate the solid phase, and the solid phase is washed, dried, and ground into powder to obtain the halloysite nanotube-corrosion inhibitor composite.

[0060] The weight ratio of the halloysite nanotubes to the hydrochloric acid solution in step B1 is 5:60; the weight ratio of the aluminum tripolyphosphate and deionized water in step B2 to the halloysite nanotubes in step B1 is 6:50:1.

[0061] Preparation Example 5

[0062] This preparation example provides a halloysite nanotube-aluminum tripolyphosphate composite, and the preparation method includes the following steps:

[0063] B1, adding a 4 mol / L hydrochloric acid solution to the halloysite nanotubes, heating and stirring in a water bath for 5 h, centrifuging, filtering, washing, and grinding to obtain hydrochloric acid-etched halloysite nanotubes;

[0064] B2, mixing the hydrochloric acid-etched halloysite nanotubes obtained in step B1, aluminum tripolyphosphate, and deionized water, ultrasonically dispersing the mixture for 50 minutes, and vacuum drying the resulting suspension;

[0065] B3. After vacuum drying, centrifugation is performed to separate the solid phase, and the solid phase is washed, dried, and ground into powder to obtain the halloysite nanotube-corrosion inhibitor composite.

[0066] The weight ratio of the halloysite nanotubes to the hydrochloric acid solution in step B1 is 6:70; the weight ratio of the aluminum tripolyphosphate and deionized water in step B2 to the halloysite nanotubes in step B1 is 7:55:1.

[0067] Preparation Example 6

[0068] This preparation example provides a halloysite nanotube-aluminum tripolyphosphate composite, and the preparation method includes the following steps:

[0069] B1, adding a 4 mol / L hydrochloric acid solution to the halloysite nanotubes, heating and stirring in a water bath for 5 h, centrifuging, filtering, washing, and grinding to obtain hydrochloric acid-etched halloysite nanotubes;

[0070] B2, mixing the hydrochloric acid-etched halloysite nanotubes obtained in step B1, aluminum tripolyphosphate, and deionized water, ultrasonically dispersing the mixture for 50 minutes, and vacuum drying the resulting suspension;

[0071] B3. After vacuum drying, centrifugation is performed to separate the solid phase, and the solid phase is washed, dried, and ground into powder to obtain the halloysite nanotube-corrosion inhibitor composite.

[0072] The weight ratio of the halloysite nanotubes to the hydrochloric acid solution in step B1 is 7:80; the weight ratio of the aluminum tripolyphosphate and deionized water in step B2 to the halloysite nanotubes in step B1 is 8:60:1.

[0073] Example 1

[0074] This embodiment provides an oil-based coating for stainless steel and aluminum materials, comprising the following components by weight: 60 parts of epoxy resin, 8 parts of curing agent, 30 parts of organic solvent, 10 parts of nano-silicon dioxide, 5 parts of nano-titanium dioxide, 15 parts of lignin nano-microspheres, 10 parts of halloysite nanotube-aluminum tripolyphosphate complex, 2 parts of dispersant, 1 part of defoaming agent, and 2 parts of leveling agent.

[0075] The preparation method of the oil-based coating for stainless steel and aluminum materials in this preparation example comprises the following steps:

[0076] S1, mixing the epoxy resin, organic solvent, defoamer and dispersant uniformly;

[0077] S2, adding the nano-silica, nano-titanium dioxide, lignin nano-microspheres and halloysite nanotube-aluminum tripolyphosphate complex, and stirring at a rotation speed of 750 rpm for 1.2 hours;

[0078] S3. Add the leveling agent and curing agent, and stir for 5 minutes at a rotation speed of 550 rpm to prepare the oil-based coating for the stainless steel and aluminum materials.

[0079] The lignin nanospheres used in this embodiment were prepared by Preparation Example 1, the halloysite nanotube-aluminum tripolyphosphate composite was prepared by Preparation Example 4, the curing agent was a modified amine curing agent, the organic solvent was butyl acetate, the dispersant was sodium lauryl sulfate, the defoaming agent was BYK024, and the leveling agent was a silicone leveling agent.

[0080] Examples 2-4

[0081] Example 2

[0082] The difference between this embodiment and Example 1 is that when preparing the oily coating for stainless steel and broken aluminum materials, the total weight of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is 25 parts, and the weight ratio of the lignin nanospheres to the halloysite nanotube-aluminum tripolyphosphate complex is 1:1.

[0083] Example 3

[0084] The difference between this embodiment and Example 1 is that, when preparing the oily coating for stainless steel and broken aluminum materials, the total weight of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is 25 parts, and the weight ratio of the lignin nanospheres to the halloysite nanotube-aluminum tripolyphosphate complex is 1.2:1.

[0085] Example 4

[0086] The difference between this embodiment and Example 1 is that, when preparing the oily coating for stainless steel and broken aluminum materials, the total weight of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is 25 parts, and the weight ratio of the lignin nanospheres to the halloysite nanotube-aluminum tripolyphosphate complex is 1.8:1.

[0087] Comparative Examples 1-3

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 1 is that the halloysite nanotube-aluminum tripolyphosphate complex is not added when preparing the oily coating for stainless steel and aluminum materials.

[0090] Comparative Example 2

[0091] The difference between this comparative example and Example 1 is that no lignin nanoparticles were added when preparing the oily coating for stainless steel and aluminum.

[0092] Comparative Example 3

[0093] The difference between this comparative example and Example 1 is that, when preparing the oily coating for stainless steel and aluminum materials, no lignin nanospheres and halloysite nanotube-aluminum tripolyphosphate complex were added.

[0094] The oily coating for stainless steel and broken aluminum materials prepared in the examples and comparative examples of the present application is used in the field of preparing wear-resistant and anti-corrosion coatings. The prepared oily coating for stainless steel and broken aluminum materials is applied to a pretreated substrate and dried to obtain a corrosion-resistant and wear-resistant coating.

[0095] The base material is one of stainless steel and broken aluminum; the pretreatment includes degreasing, rust removal, and polishing; the drying temperature is 70° C. and the drying time is 1.2 hours.

[0096] The performance of the prepared anti-corrosion coating was tested.

[0097] Experimental testing:

[0098] The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0099] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3

[0100]

[0101]

[0102] Analysis of results: The difference between Examples 2-4 and Example 1 is that, when preparing the oily coating for stainless steel and broken aluminum materials, the total weight of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is 25 parts, and the weight ratio of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is different. Combined with the experimental test results in Table 1, it can be seen that when the weight ratio of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex is 1.5:1, the obtained oily coating for stainless steel and broken aluminum materials has good adhesion, excellent wear resistance and corrosion resistance. The difference between Comparative Example 1 and Example 1 is that, when preparing the oily coating for stainless steel and broken aluminum materials, the halloysite nanotube-aluminum tripolyphosphate complex is not added. The difference between Comparative Example 2 and Example 1 is that, when preparing the oily coating for stainless steel and broken aluminum materials, the lignin nanospheres are not added. Comparative Example 3 differs from Example 3 in that neither the lignin nanospheres nor the halloysite nanotube-aluminum tripolyphosphate complex were added during the preparation of the oil-based coating for stainless steel and aluminum-breaking materials. Combined with the experimental test results in Table 1, it can be seen that the combined use of the lignin nanospheres and the halloysite nanotube-aluminum tripolyphosphate complex during the preparation of the oil-based coating for stainless steel and aluminum-breaking materials significantly improves the overall performance of the resulting oil-based coating for stainless steel and aluminum-breaking materials.

[0103] Examples 5-6

[0104] The difference between Example 5-6 and Example 3 is that the weight percentages of some components are changed when preparing the oil-based coating for stainless steel and aluminum. See Table 2 for the differences.

[0105] Table 2 - Differences between Examples 5-6 and Example 3

[0106]

[0107] The experimental test results of Examples 5-6 are shown in Table 3.

[0108] Table 3 - Experimental test results of Examples 5-6

[0109]

[0110] Result analysis: The difference between Example 5-6 and Example 1 is that when preparing the oil-based coating for stainless steel and broken aluminum materials, the weight proportions of some components are different. Combined with the experimental test results in Table 3, it can be seen that when preparing the oil-based coating for stainless steel and broken aluminum materials, the oil-based coating for stainless steel and broken aluminum materials prepared in Example 5 has better comprehensive performance.

[0111] Examples 7-8

[0112] Example 7

[0113] The difference between this embodiment and embodiment 5 is that different preparation parameters of the lignin nanoparticles are used in preparing the oil-based coating for stainless steel and aluminum materials. The lignin nanoparticles in this embodiment are prepared by Preparation Example 2.

[0114] Example 8

[0115] The difference between this embodiment and embodiment 5 is that different preparation parameters of the lignin nanoparticles are used in preparing the oil-based coating for stainless steel and aluminum materials. The lignin nanoparticles in this embodiment are prepared by preparation example 3.

[0116] Examples 9-10

[0117] Example 9

[0118] The difference between this embodiment and Example 7 is that the preparation parameters of the halloysite nanotube-aluminum tripolyphosphate complex used in the preparation of the oily coating for stainless steel and aluminum materials are different. The halloysite nanotube-aluminum tripolyphosphate complex in this embodiment is prepared by Preparation Example 5.

[0119] Example 10

[0120] The difference between this embodiment and Example 7 is that the preparation parameters of the halloysite nanotube-aluminum tripolyphosphate complex used in the preparation of the oily coating for stainless steel and aluminum materials are different. The halloysite nanotube-aluminum tripolyphosphate complex in this embodiment is prepared by Preparation Example 6.

[0121] The experimental test results of Examples 7-10 are shown in Table 4.

[0122] Table 4 - Experimental test results of Examples 7-10

[0123]

[0124] Result analysis: When preparing oil-based coatings for stainless steel and aluminum-breaking materials, the lignin nanospheres prepared in Preparation Example 2 and the halloysite nanotube-aluminum tripolyphosphate complex prepared in Preparation Example 5 can better improve the comprehensive performance of oil-based coatings for stainless steel and aluminum-breaking materials.

[0125] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An oily paint for stainless steel and aluminum materials, characterized in that: The invention comprises the following components in parts by weight: 60-80 parts of epoxy resin, 8-15 parts of curing agent, 30-50 parts of organic solvent, 10-15 parts of nano-silicon dioxide, 5-10 parts of nano-titanium dioxide, 8-14 parts of halloysite nanotube-aluminum tripolyphosphate complex, 12-21 parts of lignin nano-microspheres, 2-4 parts of dispersant, 1-3 parts of defoaming agent, and 2-4 parts of leveling agent; The method for preparing the lignin nanospheres comprises the following steps: A1. Mix enzymatically hydrolyzed lignin, γ-valerolactone, and ultrapure water, and ultrasonically disperse for 20-30 minutes to completely dissolve the lignin. Then, centrifuge at 7000-8000 rpm for 20-25 minutes, and collect the supernatant to prepare a lignin solution. A2. injecting the prepared lignin solution into ultrapure water to prepare a lignin micro-nanosphere suspension; A3, adding the lignin micro-nanosphere suspension into an autoclave, heating at 160-180° C. for 10-12 hours, and freeze-drying to obtain the lignin nano-microspheres; The preparation method of the halloysite nanotube-aluminum tripolyphosphate composite comprises the following steps: B1. Add a (3-5) mol / L hydrochloric acid solution to the halloysite nanotubes, heat and stir in a water bath for 4-6 hours, centrifuge, filter, wash, and grind to obtain hydrochloric acid-etched halloysite nanotubes; B2, mixing the hydrochloric acid-etched halloysite nanotubes obtained in step B1, aluminum tripolyphosphate, and deionized water, ultrasonically dispersing the mixture for 40-60 minutes, and vacuum drying the resulting suspension; B3. After vacuum drying, centrifugation is performed to separate the solid phase, and the solid phase is washed, dried, and ground into powder to obtain the halloysite nanotube-corrosion inhibitor composite; Wherein, the weight ratio of the halloysite nanotube-aluminum tripolyphosphate complex to the lignin nanospheres is 1:(1.2-1.8).

2. The oil-based paint for stainless steel and aluminum materials according to claim 1, characterized in that: In the step A1, the weight ratio of the enzymatically hydrolyzed lignin, γ-valerolactone and ultrapure water is (20-25): (8-10): 1; in the step A2, the volume ratio of the lignin solution to ultrapure water is 1: (3-5).

3. The oily paint for stainless steel and aluminum materials according to claim 1, characterized in that: The weight ratio of the halloysite nanotubes to the hydrochloric acid solution in step B1 is (5-7): (60-80); the weight ratio of the aluminum tripolyphosphate and deionized water in step B2 to the halloysite nanotubes in step B1 is (6-8): (50-60):

1.

4. The oil-based paint for stainless steel and aluminum materials according to claim 1, characterized in that: The curing agent is a modified amine curing agent; the organic solvent is butyl acetate; the dispersant is sodium lauryl sulfate; the defoaming agent is BYK024; and the leveling agent is an organic silicone leveling agent.

5. A method for preparing an oily paint for stainless steel and aluminum materials according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, mixing the epoxy resin, organic solvent, defoamer and dispersant uniformly; S2, adding the nano-silica, nano-titanium dioxide, lignin nano-microspheres and halloysite nanotube-aluminum tripolyphosphate complex, and stirring at a rotation speed of 700-800 rpm for 1-1.5 hours; S3. Add the leveling agent and curing agent, and stir for 4-8 minutes at a rotation speed of 500-600 rpm to prepare the oil-based coating for stainless steel and aluminum materials.

6. An application of the oily paint for stainless steel and aluminum materials according to any one of claims 1 to 4 in the preparation of wear-resistant and anti-corrosion coatings, characterized in that: The oily paint for stainless steel and aluminum materials is coated on the pretreated substrate and dried to obtain an anti-corrosion and wear-resistant coating.

7. The use of the oily paint for stainless steel and aluminum materials according to claim 6 in the field of preparing wear-resistant and anti-corrosion coatings, characterized in that: The substrate is one of stainless steel and aluminum; the pretreatment includes degreasing, rust removal, and polishing; the drying temperature is 60-80° C., and the drying time is 1-1.5 hours.

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