Environment-friendly metal product anti-rust coating and preparation process

Abstract

The invention discloses a green and environment-friendly metal product anti-rust coating and a preparation process, and aims to solve the problems that a current metal product anti-rust coating contains harmful solvents and heavy metals, seriously pollutes the environment, easily falls off or is abraded in the long-term use process, cannot isolate oxygen, moisture and other corrosive media in the air, and cannot be used for a long time. The metal product comprises the following raw materials in parts by weight: 8-12% of epoxy acrylic resin, 10-20% of a curing agent, 10-20% of a curing agent, 1-3% of a curing agent, and the balance of a solvent. 10%-15% by mass of a waterborne polyurethane emulsion; the modified alkyd resin accounts for 7%-10% by mass; zinc phosphate accounts for 4%-7% by mass; and the mica iron red accounts for 4-7% by mass. Through combined use of the epoxy acrylic resin, the waterborne polyurethane emulsion and the modified alkyd resin, harmful solvents and heavy metals are not contained, pollution to the environment is reduced, meanwhile, deionized water used in the preparation process serves as a solvent, and the environmental protection performance of the product is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-rust coatings, and specifically to a green and environment-friendly anti-rust coating for metal products and a preparation process thereof. Background Art

[0002] Metal products refer to various products made of metal as raw materials, which are widely used, including daily necessities, industrial production products, artworks, etc. The manufacturing of metal products requires multiple processing steps, including metal smelting, casting, rolling, stretching, stamping, welding, etc. Metal products are characterized by good electrical conductivity, thermal conductivity, corrosion resistance, high strength, etc., so they are widely used in various fields. Rust is the corrosion of metal in the atmosphere caused by oxygen, moisture and other impurities, which is called rusting. The corrosion product is called rust. The loss caused by the rust of metal products far exceeds the value of the materials used. Therefore, in order to reduce the loss caused by metal rust, it is very important to study the rusting law of metal products and their protection technologies.

[0003] According to the published patent 202410189915.5, it includes the following components in parts by weight: 30-50 parts of resin, 20-30 parts of nano-aluminum oxide, 1-2 parts of dryer, 30-40 parts of solvent, 2-4 parts of mica powder, 1-3 parts of wintergreen oil, 2-5 parts of nano-carbon, 3-6 parts of anti-cratering agent, 2-6 parts of epoxy accelerator, 0.1-0.5 parts of anti-skinning agent. In the process of realizing the invention, the inventor found that at least the following problems in the prior art have not been solved. By adding an anti-cratering agent, an antistatic agent and a flame retardant, the problems of crater formation in the coating and short service life of the anti-rust coating are solved. During use, traditional anti-rust coatings for metal products contain harmful solvents and heavy metals, which cause relatively serious environmental pollution. They are prone to peeling or wear during long-term use, and cannot isolate corrosive media such as oxygen and moisture in the air, thus greatly shortening the service life of metal products. Therefore, new technical solutions need to be designed to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a green and environment-friendly anti-rust coating for metal products and a preparation process thereof, so as to solve the technical problems that the current anti-rust coating for metal products contains harmful solvents and heavy metals, causes relatively serious environmental pollution, is prone to peeling or wear during long-term use, and cannot isolate corrosive media such as oxygen and moisture in the air, thus greatly shortening the service life of metal products.

[0005] To achieve the above object, the present invention provides the following technical solutions: A green and environment-friendly anti-rust coating for metal products and its preparation process, including the following raw materials and their weight fractions: Epoxy acrylate resin is 8% - 12% by mass; Waterborne polyurethane emulsion is 10% - 15% by mass; Modified alkyd resin is 7% - 10% by mass; Zinc phosphate is 4% - 7% by mass; Mica iron red is 4% - 7% by mass; Talc powder is 4% - 7% by mass; Rare earth phosphate is 4% - 9% by mass; Silicon dioxide is 8% - 15% by mass; Phytic acid is 0.5% - 1.5% by mass; Sodium nitrite solution is 5% - 12% by mass; Plant polyphenols are 2% - 5% by mass; Maleic anhydride is 3% - 6% by mass; Dispersant is 4% - 8% by mass; Defoamer is 1% - 3% by mass; Leveling agent is 0.5% - 2% by mass; pH regulator is 0.5% - 2% by mass; Antioxidant is 1% - 4% by mass; Carboxymethyl cellulose sodium is 2% - 4% by mass; Zinc sulfate is 1% - 5% by mass; Deionized water is 10% - 18% by mass.

[0006] As a preferred embodiment of the present invention, the green and environment-friendly anti-rust coating for metal products includes the following raw materials and their weight fractions: Epoxy acrylate resin is 12% by mass; Waterborne polyurethane emulsion is 15% by mass; Modified alkyd resin is 10% by mass; Zinc phosphate is 4% by mass; Mica iron red is 4% by mass; Talc powder is 4% by mass; Rare earth phosphate is 4% by mass; Silicon dioxide is 8% by mass; Phytic acid is 0.5% by mass; Sodium nitrite solution is 5% by mass; Plant polyphenols are 2% by mass; Maleic anhydride is 3% by mass; Dispersant is 4% by mass; Defoamer is 1% by mass; Leveling agent is 0.5% by mass; pH regulator is 1% by mass; Antioxidant is 1% by mass; Carboxymethyl cellulose sodium is 2% by mass; Zinc sulfate is 1% by mass; Deionized water is 18% by mass.

[0007] As a preferred embodiment of the present invention, the green and environment-friendly anti-rust coating for metal products includes the following raw materials and their weight fractions: Epoxy acrylate resin is 8% by mass; Waterborne polyurethane emulsion is 9% by mass; Modified alkyd resin is 9% by mass; Zinc phosphate is 5% by mass; Mica iron red is 5% by mass; Talc powder is 5% by mass; Rare earth phosphate is 5% by mass; Silicon dioxide is 9% by mass; Phytic acid is 1% by mass; Sodium nitrite solution is 5% by mass; Plant polyphenols are 4% by mass; Maleic anhydride is 5% by mass; Dispersant is 6% by mass; Defoamer is 2% by mass; Leveling agent is 1% by mass; pH regulator is 1% by mass; Antioxidant is 1% by mass; Carboxymethyl cellulose sodium is 4% by mass; Zinc sulfate is 5% by mass; Deionized water is 10% by mass.

[0008] As a preferred embodiment of the present invention, the dispersant used is silicate or carbonate;

[0009] The defoamer is prepared by mixing dimethyl silicone oil, silica white and emulsifier;

[0010] The emulsifier used is sodium dodecyl sulfate;

[0011] The leveling agent used is aqueous leveling agent BYK-333;

[0012] The pH regulator used is citric acid, acetic acid and plant-based regulator;

[0013] The antioxidant used is 2,5-di-tert-butylhydroquinone.

[0014] As a preferred embodiment of the present invention, the preparation process of a green environmental protection metal product rust-proof coating includes the following preparation steps:

[0015] S1. First, add deionized water, zinc phosphate, mica iron oxide red, talcum powder, rare earth phosphate, silicon dioxide, phytic acid, sodium nitrite solution and dispersant into a high-speed dispersion tank for stirring and dispersing. After the raw materials are stirred and dispersed evenly, put them into a grinding machine and grind until the fineness is <30μm to obtain a mixed raw material A;

[0016] S2. Then put epoxy acrylate resin, aqueous polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing to obtain a mixed raw material B;

[0017] S3. Then add the mixed raw material A to the mixed raw material B for stirring and mixing to obtain a mixed raw material C;

[0018] S4. Then sequentially add plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate into the mixed raw material C, stir at low speed until uniform, and then filter the stirred raw materials and conduct natural cooling to finally obtain a green environmental protection metal product rust-proof coating;

[0019] S5. Coat the green environmental protection metal product rust-proof coating on the metal surface, and a green environmental protection metal product rust-proof coating will be formed on the metal surface.

[0020] As a preferred embodiment of the present invention, in the step S1, the rotation speed of the high-speed dispersion tank is 1200 - 3000 r / min, the dispersion time is 15 - 20 min, the rotation speed of the grinding machine is 1200 - 2000 r / min, and the dispersion time is 35 - 60 min.

[0021] As a preferred embodiment of the present invention, in step S2, epoxy acrylate resin, aqueous polyurethane emulsion and modified alkyd resin are put into a stirrer for stirring and mixing. The rotation speed of the stirrer is 500 - 1500 r / min, the dispersion time is 35 - 60 min, and the temperature is 20°C - 25°C.

[0022] As a preferred embodiment of the present invention, when the mixed raw material A is added to the mixed raw material B for stirring and mixing in step S3, the rotation speed of the stirrer is 1000 - 1200 r / min, the dispersion time is 30 - 45 min, and the temperature is 35°C - 55°C.

[0023] As a preferred embodiment of the present invention, in step S4, plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate are successively added to the mixed raw material C, and stirred at a low speed until uniform. The rotation speed of the stirrer is 500 - 700 r / min, the dispersion time is 60 - 120 min, and the temperature is 45°C - 50°C.

[0024] As a preferred embodiment of the present invention, in step S5, the green environmental protection metal product rust-proof coating is coated on the metal surface, and a green environmental protection metal product rust-proof coating is formed on the metal surface. The number of coating times is 2 - 3 times, the time interval between each coating is 24 h, and the temperature is 20°C - 30°C.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] By the combined use of epoxy acrylate resin, aqueous polyurethane emulsion and modified alkyd resin in the present invention, it does not contain harmful solvents and heavy metals, reducing environmental pollution. At the same time, deionized water used as a solvent in the preparation process further improves the environmental protection performance of the product;

[0027] Moreover, it has good adhesion and film-forming properties, and can be tightly combined with the metal surface. At the same time, the addition of fillers such as silica and talcum powder enhances the hardness and wear resistance of the coating, making the coating not easy to fall off or wear during long-term use.

[0028] Through rust-proof pigments such as zinc phosphate, mica iron oxide red, and rare earth phosphate, as well as corrosion inhibitors such as phytic acid and sodium nitrite solution, a dense rust-proof layer can be formed on the metal surface, effectively isolating corrosion media such as oxygen and moisture in the air, thereby greatly extending the service life of metal products, reducing the frequency of maintenance and replacement, and thus reducing the overall use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[0030] Figure 1 This is the flowchart of the present invention. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] The present invention provides a technical solution: a rust-proof coating for green environmental protection metal products and a preparation process, including the following raw materials and their weight fractions: epoxy acrylate resin is 8% - 12% by mass; waterborne polyurethane emulsion is 10% - 15% by mass; modified alkyd resin is 7% - 10% by mass; zinc phosphate is 4% - 7% by mass; mica iron red is 4% - 7% by mass; talcum powder is 4% - 7% by mass; rare earth phosphate is 4% - 9% by mass; silicon dioxide is 8% - 15% by mass; phytic acid is 0.5% - 1.5% by mass; sodium nitrite solution is 5% - 12% by mass; plant polyphenols are 2% - 5% by mass; maleic anhydride is 3% - 6% by mass; dispersant is 4% - 8% by mass; defoamer is 1% - 3% by mass; leveling agent is 0.5% - 2% by mass; pH regulator is 0.5% - 2% by mass; antioxidant is 1% - 4% by mass; carboxymethyl cellulose sodium is 2% - 4% by mass; zinc sulfate is 1% - 5% by mass; deionized water is 10% - 18% by mass.

[0033] Further, the dispersant used is silicate or carbonate;

[0034] The defoamer is prepared by mixing dimethyl silicone oil, silica and emulsifier;

[0035] The emulsifier used is sodium dodecyl sulfate;

[0036] The leveling agent used is aqueous leveling agent BYK-333;

[0037] The pH regulator used is citric acid, acetic acid and plant-based regulator;

[0038] The antioxidant used is 2,5-di-tert-butylhydroquinone.

[0039] Further, a preparation process of a rust-proof coating for green environmental protection metal products includes the following preparation steps:

[0040] S1. First, add deionized water, zinc phosphate, mica iron oxide red, talcum powder, rare earth phosphate, silicon dioxide, phytic acid, sodium nitrite solution and dispersant into a high-speed dispersion tank for stirring and dispersion. After the raw materials are stirred and dispersed evenly, put them into a grinding machine and grind until the fineness is <30μm to obtain the mixed raw material A;

[0041] S2. Then, put epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing to obtain the mixed raw material B;

[0042] S3. Then, add the mixed raw material A to the mixed raw material B for stirring and mixing to obtain the mixed raw material C;

[0043] S4. Then, add plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate to the mixed raw material C in sequence, stir at low speed until uniform, and then filter the stirred and uniform raw materials and conduct natural cooling to finally obtain the green environmental protection metal product rust-proof coating;

[0044] S5. Coat the green environmental protection metal product rust-proof coating on the metal surface, and a green environmental protection metal product rust-proof coating will be formed on the metal surface.

[0045] Further, in step S1, the rotation speed of the high-speed dispersion tank is 1200 - 3000 r / min, the dispersion time is 15 - 20 min, the rotation speed of the grinding machine is 1200 - 2000 r / min, and the dispersion time is 35 - 60 min.

[0046] Further, in step S2, when epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin are put into a stirrer for stirring and mixing, the rotation speed of the stirrer is 500 - 1500 r / min, the dispersion time is 35 - 60 min, and the temperature is 20°C - 25°C.

[0047] Further, in step S3, when the mixed raw material A is added to the mixed raw material B for stirring and mixing, the rotation speed of the stirrer is 1000 - 1200 r / min, the dispersion time is 30 - 45 min, and the temperature is 35°C - 55°C.

[0048] Further, in step S4, when adding plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate to the mixed raw material C in sequence, stir at low speed until uniform, the rotation speed of the stirrer is 500 - 700 r / min, the dispersion time is 60 - 120 min, and the temperature is 45°C - 50°C.

[0049] Further, in step S5, the green environmental protection metal product rust preventive coating is applied to the metal surface, i.e., a green environmental protection metal product rust preventive coating is formed on the metal surface. The number of coating times is 2 - 3 times, the time interval between each coating is 24 h, and the temperature is 20°C - 30°C.

[0050] Example 1

[0051] The green environmental protection metal product rust preventive coating includes the following raw materials and their weight fractions: epoxy acrylate resin is 12% by mass; waterborne polyurethane emulsion is 15% by mass; modified alkyd resin is 10% by mass; zinc phosphate is 4% by mass; micaceous iron oxide red is 4% by mass; talc powder is 4% by mass; rare earth phosphate is 4% by mass; silicon dioxide is 8% by mass; phytic acid is 0.5% by mass; sodium nitrite solution is 5% by mass; plant polyphenols are 2% by mass; maleic anhydride is 3% by mass; dispersant is 4% by mass; defoamer is 1% by mass; leveling agent is 0.5% by mass; pH regulator is 1% by mass; antioxidant is 1% by mass; sodium carboxymethyl cellulose is 2% by mass; zinc sulfate is 1% by mass; deionized water is 18% by mass.

[0052] It includes the following preparation steps:

[0053] S1. First, add deionized water, zinc phosphate, micaceous iron oxide red, talc powder, rare earth phosphate, silicon dioxide, phytic acid, sodium nitrite solution and dispersant into a high-speed dispersion tank for stirring and dispersion. The rotation speed is 2500 r / min, and the dispersion time is 20 min. After the raw materials are stirred and dispersed evenly, they are put into a grinding machine and ground to a fineness < 30 μm. The rotation speed of the grinding machine is 1500 r / min, and the dispersion time is 50 min to obtain a mixed raw material A;

[0054] S2. Then, put the epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing. The rotation speed is 800 r / min, the dispersion time is 40 min, and the temperature is 23°C to obtain a mixed raw material B;

[0055] S3. Then, add the mixed raw material A to the mixed raw material B for stirring and mixing. The rotation speed is 1000 r / min, the dispersion time is 35 min, and the temperature is 35°C to obtain a mixed raw material C;

[0056] S4. Then, sequentially add plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate to the mixed raw material C, and stir at a low speed until uniform. The rotation speed is 500 r / min, the dispersion time is 90 min, and the temperature is 45°C. Then, filter the stirred raw materials and cool them naturally to finally obtain the green environmental protection metal product rust preventive coating;

[0057] S5. Coat the rust preventive coating for green environmental protection metal products on the metal surface, i.e., a rust preventive coating for green environmental protection metal products is formed on the metal surface. The coating is applied 3 times, with a time interval of 24 h between each coating, and the temperature is 25 °C.

[0058] Example 2

[0059] The rust preventive coating for green environmental protection metal products includes the following raw materials and their weight fractions: epoxy acrylate resin is 8% by mass; waterborne polyurethane emulsion is 9% by mass; modified alkyd resin is 9% by mass; zinc phosphate is 5% by mass; micaceous iron oxide red is 5% by mass; talcum powder is 5% by mass; rare earth phosphate is 5% by mass; silicon dioxide is 9% by mass; phytic acid is 1% by mass; sodium nitrite solution is 5% by mass; plant polyphenols are 4% by mass; maleic anhydride is 5% by mass; dispersant is 6% by mass; defoamer is 2% by mass; leveling agent is 1% by mass; pH regulator is 1% by mass; antioxidant is 1% by mass; sodium carboxymethyl cellulose is 4% by mass; zinc sulfate is 5% by mass; deionized water is 10% by mass.

[0060] It includes the following preparation steps:

[0061] S1. First, add deionized water, zinc phosphate, micaceous iron oxide red, talcum powder, rare earth phosphate, silicon dioxide, phytic acid, sodium nitrite solution and dispersant into a high-speed dispersion tank for stirring and dispersion. The rotation speed is 2500 r / min, and the dispersion time is 20 min. After the raw materials are stirred and dispersed evenly, they are put into a grinding machine and ground to a fineness < 30 μm. The rotation speed of the grinding machine is 1500 r / min, and the dispersion time is 50 min to obtain the mixed raw material A;

[0062] S2. Then, put the epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing. The rotation speed is 800 r / min, and the dispersion time is 40 min, and the temperature is 23 °C to obtain the mixed raw material B;

[0063] S3. Then, add the mixed raw material A to the mixed raw material B for stirring and mixing. The rotation speed is 1000 r / min, and the dispersion time is 35 min, and the temperature is 35 °C to obtain the mixed raw material C;

[0064] S4. Then, sequentially add plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate to the mixed raw material C, and stir at a low speed until evenly distributed. The rotation speed is 500 r / min, and the dispersion time is 90 min, and the temperature is 45 °C. Then, filter the stirred raw materials and cool them naturally to finally obtain the rust preventive coating for green environmental protection metal products;

[0065] S5. Coating the rust-proof coating for green environmental protection metal products on the metal surface forms a rust-proof coating for green environmental protection metal products on the metal surface. The number of coating times is 3 times, the time interval between each coating is 24 h, and the temperature is 25 °C.

[0066] The data parameter table 1 of the traditional rust-proof coating is as follows:

[0067] Test Items Environmental Protection Level Adhesion Film Forming Property Service Life Parameter Index Low Poor Poor 3 years

[0068] The data parameter table 2 of the rust-proof coating in Example 1 is as follows:

[0069] Test Items Environmental Protection Level Adhesion Film Forming Property Service Life Parameter Index Average Average Average 6 years

[0070] The data parameter table 3 of the rust-proof coating in Example 2 is as follows:

[0071] Test Items Environmental Protection Level Adhesion Film Forming Property Service Life Parameter Index High Good Good 10 years

[0072] In summary, by referring to the data comparison in Table 1, Table 2 and Table 3, it is obtained that through the combined use of epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin, it does not contain harmful solvents and heavy metals, reducing environmental pollution. At the same time, deionized water used as a solvent in the preparation process further improves the environmental protection performance of the product;

[0073] Moreover, it has good adhesion and film-forming properties, and can be closely combined with the metal surface. At the same time, the addition of fillers such as silica and talcum powder enhances the hardness and wear resistance of the coating, making the coating not easy to fall off or wear during long-term use.

[0074] Through rust-proof pigments such as zinc phosphate, mica iron oxide red, rare earth phosphate, as well as phytic acid and sodium nitrite solution corrosion inhibitors, a dense rust-proof layer can be formed on the metal surface, effectively isolating corrosion media such as oxygen and moisture in the air, thereby greatly extending the service life of metal products, reducing the frequency of maintenance and replacement, and thus reducing the overall use cost.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0076] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rust-proof coating for green environmental protection metal products, characterized in that: It includes the following raw materials and their weight fractions: epoxy acrylate resin is 8% - 12% by mass; waterborne polyurethane emulsion is 10% - 15% by mass; modified alkyd resin is 7% - 10% by mass; zinc phosphate is 4% - 7% by mass; mica iron oxide red is 4% - 7% by mass; talcum powder is 4% - 7% by mass; rare earth phosphate is 4% - 9% by mass; silicon dioxide is 8% - 15% by mass; phytic acid is 0.5% - 1.5% by mass; sodium nitrite solution is 5% - 12% by mass; plant polyphenols are 2% - 5% by mass; maleic anhydride is 3% - 6% by mass; dispersant is 4% - 8% by mass; defoamer is 1% - 3% by mass; leveling agent is 0.5% - 2% by mass; pH regulator is 0.5% - 2% by mass; antioxidant is 1% - 4% by mass; sodium carboxymethyl cellulose is 2% - 4% by mass; zinc sulfate is 1% - 5% by mass; deionized water is 10% - 18% by mass.

2. The anti-rust coating for green environmental protection metal products according to claim 1, wherein: It includes the following raw materials and their weight fractions: epoxy acrylate resin is 12% by mass; waterborne polyurethane emulsion is 15% by mass; modified alkyd resin is 10% by mass; zinc phosphate is 4% by mass; mica iron oxide red is 4% by mass; talcum powder is 4% by mass; rare earth phosphate is 4% by mass; silicon dioxide is 8% by mass; phytic acid is 0.5% by mass; sodium nitrite solution is 5% by mass; plant polyphenols are 2% by mass; maleic anhydride is 3% by mass; dispersant is 4% by mass; defoamer is 1% by mass; leveling agent is 0.5% by mass; pH regulator is 1% by mass; antioxidant is 1% by mass; sodium carboxymethyl cellulose is 2% by mass; zinc sulfate is 1% by mass; deionized water is 18% by mass.

3. A rust-proof coating for green environmental protection metal products according to claim 1, characterized in that: It includes the following raw materials and their weight fractions: epoxy acrylate resin is 8% by mass; waterborne polyurethane emulsion is 9% by mass; modified alkyd resin is 9% by mass; zinc phosphate is 5% by mass; mica iron oxide red is 5% by mass; talcum powder is 5% by mass; rare earth phosphate is 5% by mass; silicon dioxide is 9% by mass; phytic acid is 1% by mass; sodium nitrite solution is 5% by mass; plant polyphenols are 4% by mass; maleic anhydride is 5% by mass; dispersant is 6% by mass; defoamer is 2% by mass; leveling agent is 1% by mass; pH regulator is 1% by mass; antioxidant is 1% by mass; sodium carboxymethyl cellulose is 4% by mass; zinc sulfate is 5% by mass; deionized water is 10% by mass.

4. A rust-proof coating for green environmental protection metal products according to claim 1, characterized in that: The dispersant used is silicate or carbonate; The defoamer is prepared by mixing dimethyl silicone oil, silica and emulsifier; The emulsifier used is sodium dodecyl sulfate; The leveling agent used is aqueous leveling agent BYK - 333; The pH regulator used is citric acid, acetic acid and plant - based regulator; The antioxidant used is 2,5 - di - tert - butylhydroquinone.

5. The preparation process of an anti-rust coating for a green and environmentally friendly metal product according to claims 1 to 4, characterized in that: It includes the following preparation steps: S1. First, add deionized water, zinc phosphate, mica iron oxide red, talc powder, rare earth phosphate, silicon dioxide, phytic acid, sodium nitrite solution and dispersant into a high-speed dispersion tank for stirring and dispersion. After the raw materials are stirred and dispersed evenly, put them into a grinder and grind until the fineness is <30 μm to obtain the mixed raw material A; S2. Then, put epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing to obtain the mixed raw material B; S3. Then, add the mixed raw material A to the mixed raw material B for stirring and mixing to obtain the mixed raw material C; S4. Then, sequentially add plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate into the mixed raw material C, and stir at low speed until uniform. Then, filter the stirred and uniform raw materials and conduct natural cooling to finally obtain the green environmental protection metal product rust-proof coating; S5. Coat the green environmental protection metal product rust-proof coating on the metal surface, and a green environmental protection metal product rust-proof coating will be formed on the metal surface.

6. The preparation process of an anti-rust coating for a green and environmentally friendly metal product according to claim 5, characterized in that: In the step S1, the rotation speed of the high-speed dispersion tank is 1200 - 3000 r / min, the dispersion time is 15 - 20 min, the rotation speed of the grinder is 1200 - 2000 r / min, and the dispersion time is 35 - 60 min.

7. The preparation process of an anti-rust coating for a green environmental protection metal product according to claim 5, characterized in that: In the step S2, when putting epoxy acrylate resin, waterborne polyurethane emulsion and modified alkyd resin into a stirrer for stirring and mixing, the rotation speed of the stirrer is 500 - 1500 r / min, the dispersion time is 35 - 60 min, and the temperature is 20°C - 25°C.

8. The preparation process of an anti-rust coating for a green environmental protection metal product according to claim 5, characterized in that: In the step S3, when adding the mixed raw material A to the mixed raw material B for stirring and mixing, the rotation speed of the stirrer is 1000 - 1200 r / min, the dispersion time is 30 - 45 min, and the temperature is 35°C - 55°C.

9. The preparation process of an anti-rust coating for a green and environmentally friendly metal product according to claim 5, characterized in that: In the step S4, when sequentially adding plant polyphenols, maleic anhydride, dispersant, defoamer, leveling agent, pH regulator, antioxidant, sodium carboxymethyl cellulose and zinc sulfate into the mixed raw material C and stirring at low speed until uniform, the rotation speed of the stirrer is 500 - 700 r / min, the dispersion time is 60 - 120 min, and the temperature is 45°C - 50°C.

10. The preparation process of an anti-rust coating for a green environmental protection metal product according to claim 5, characterized in that: In the step S5, when coating the green environmental protection metal product rust-proof coating on the metal surface, a green environmental protection metal product rust-proof coating will be formed on the metal surface. The number of coating times is 2 - 3 times, the time interval between each coating is 24 h, and the temperature is 20°C - 30°C.

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