Graphene modified environment-friendly anticorrosive paint and preparation method thereof

Abstract

The invention relates to a graphene modified environment-friendly anticorrosive paint and a preparation method thereof, the graphene modified environment-friendly anticorrosive paint is composed of 25-35 parts of a modified graphene dispersion liquid, 15-25 parts of waterborne polyurethane, 5-10 parts of an anti-rust pigment, 0.5-2 parts of a disinfectant, 0.5-1 part of a dispersant, 0.1-0.5 part of a defoaming agent, 0.1-0.5 part of a thickening agent and 30-40 parts of water, according to the modified graphene dispersion liquid, through hydrophilic groups on titanium dioxide, the dispersity of graphene is improved, the diffusion path of a corrosive medium is shielded, then the corrosion resistance of the coating is improved, the hydrophilic groups are one or more of hydroxyl, carboxyl, amino or epoxy groups, and the hydrophilic groups are one or more of hydroxyl, carboxyl, amino or epoxy groups. The excellent barrier property of the modified graphene dispersion liquid is utilized in the field of coatings, the diffusion path of a corrosive medium is prolonged, the corrosion resistance of the coating is remarkably improved, and the preparation method is simple, low in emission of organic volatile matters and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to a graphene-modified environmentally friendly anti-corrosion coating and a preparation method thereof, belonging to the field of coatings. Background Art

[0002] With the enhancement of environmental awareness and the pursuit of sustainable development, traditional anti-corrosion coatings, due to containing a large amount of organic solvents and heavy metal pigments, pose hazards to the environment and human health and can no longer meet the needs of modern society. Therefore, the development of environmentally friendly anti-corrosion coatings has become an urgent task.

[0003] Traditional anti-corrosion coatings usually use harmful substances such as chromates as rust-inhibiting pigments. These substances will release toxic substances during production, use, and disposal, polluting the environment and endangering human health. In addition, the film-forming substances of traditional coatings are mostly organic solvent-based resins. The volatilization of these solvents not only causes waste of resources but also leads to air pollution.

[0004] As a new type of two-dimensional nanomaterial, graphene has excellent mechanical, electrical, and thermal properties. However, the dispersibility of graphene is poor. There are strong π-π interactions and van der Waals forces between its lamellae, which are prone to agglomeration. This severely restricts the application of graphene in anti-corrosion coatings. Traditional dispersants such as SDBS and CTAB can disperse graphene to a certain extent, but there are problems such as large dosage and low graphene concentration, which are not conducive to the construction of high-performance composite materials.

[0005] As an environmentally friendly film-forming substance, waterborne polyurethane has good flexibility and adhesion, but its corrosion resistance and antibacterial properties need to be improved. Therefore, how to combine graphene with waterborne polyurethane to give full play to the advantages of both has become the key to the research of environmentally friendly anti-corrosion coatings. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a graphene-modified environmentally friendly anti-corrosion coating to solve the existing problems.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions: A graphene-modified environmentally friendly anti-corrosion coating is composed of a modified graphene dispersion liquid, waterborne polyurethane, a rust-inhibiting pigment, a disinfectant, a dispersant, an antifoaming agent, a thickening agent, and water, and includes the following mass percentages: The modified graphene dispersion liquid is 25 - 35 parts, the waterborne polyurethane is 15 - 25 parts, the rust-inhibiting pigment is 5 - 10 parts, the disinfectant is 0.5 - 2 parts, the dispersant is 0.5 - 1 part, the antifoaming agent is 0.1 - 0.5 part, the thickening agent is 0.1 - 0.5 part, and the water is 30 - 40 parts; Among them, the modified graphene dispersion improves the dispersion of graphene through the hydrophilic groups on titanium dioxide, shields the diffusion path of the corrosive medium, and thus enhances the anti-corrosion performance of the coating. The hydrophilic groups are one or more of hydroxyl groups, carboxyl groups, amino groups or epoxy groups.

[0008] Furthermore, the preparation method of the modified graphene dispersion comprises the following steps: S1. Mix graphene oxide and titanium dioxide evenly in a certain proportion; S2. Add the mixture obtained in S1 to an appropriate amount of deionized water to form a suspension, and through a chemical bonding reaction, make the hydrophilic groups in titanium dioxide covalently bond with the oxygen-containing groups on the surface of graphene oxide, thereby forming a molecular coating layer on the surface of graphene oxide, and further improving the dispersion and compatibility of graphene; S3. Transfer the suspension after the reaction in S2 to an ultrasonic machine for ultrasonic treatment. The ultrasonic treatment makes graphene oxide have excellent dispersion and stability in water, avoids the agglomeration of graphene oxide sheets, and thus enhances the uniformity and stability of the coating; S4. Let the mixture after ultrasonic treatment in S3 stand for a period of time to ensure its stability, and prepare a modified graphene dispersion with excellent dispersion and stability.

[0009] Furthermore, the modifier is titanium dioxide, the surface of which is rich in hydroxyl groups, which can chemically react with the hydroxyl groups, carboxyl groups or epoxy groups on the surface of graphene oxide, improve the dispersion of graphene oxide in water, and at the same time enhance the compatibility between graphene oxide and waterborne polyurethane.

[0010] Furthermore, the hydroxyl groups on the surface of titanium dioxide can respectively form ether bonds, ester bonds and stable chemical bonds with the hydroxyl groups, carboxyl groups and epoxy groups on the surface of graphene oxide, thereby realizing chemical bonding.

[0011] Furthermore, the thickness of the graphene oxide is 1 - 5 layers, and the diameter of the graphene oxide is 0.5 - 30 μm.

[0012] Furthermore, the disinfectant is IPBC, which can effectively prevent the growth of microorganisms in the coating, thereby prolonging the service life of the coating.

[0013] Furthermore, the rust-inhibiting pigment is composite iron titanate powder, which has excellent corrosion resistance, can effectively prevent the corrosion of the metal surface, and prolong the service life of the metal.

[0014] Furthermore, the defoamer is SN154, the dispersant is sodium lignosulfonate, and the thickener is sodium polyacrylate.

[0015] A preparation method of a graphene-modified environmentally friendly anti-corrosion coating, the preparation method comprising the following steps: S1. Raw material preparation: Weigh the required component raw materials according to mass percentage; S2. Coating mixing: Add the weighed modified graphene dispersion, waterborne polyurethane, rust-inhibiting pigment, disinfectant, dispersant, defoamer, thickener and water into a high-speed mixer in sequence, and stir at 1000 rad / min - 1800 rad / min for 30 - 60 minutes to ensure that each component is evenly mixed; S3. Coating aging: Let the mixed coating stand at room temperature for aging for 24 - 48 hours to ensure that each component reacts fully to form a graphene-modified environmentally friendly anti-corrosion coating.

[0016] The beneficial effects of the present invention are as follows: 1. By utilizing the excellent barrier performance of the modified graphene dispersion and the hydrophilic groups of the modifier, this application extends the diffusion path of the corrosive medium, significantly improves the anti-corrosion performance of the coating, and the use of rust-inhibiting pigments such as composite iron titanate powder further enhances the corrosion resistance of the coating.

[0017] 2. In this application, the modified graphene dispersion ensures excellent dispersion and stability of graphene in water through chemical bonding reaction and ultrasonic treatment, avoiding the agglomeration of graphene sheets, thereby enhancing the uniformity and stability of the coating.

[0018] 3. This application uses waterborne polyurethane as the film-forming substance, which is more environmentally friendly. At the same time, rust-inhibiting pigments such as composite iron titanate powder are selected as environmentally friendly pigments, avoiding the use of traditional chromate pigments, reducing environmental pollution, and the addition of the disinfectant IPBC also meets environmental protection standards, ensuring that the impact of the coating on the environment and human health is minimized during use.

[0019] 4. By optimizing the proportion of each component and the preparation process, this application reduces unnecessary components, lowers the production cost, improves the comprehensive performance of the coating at the same time, has good economic efficiency and market competitiveness. This coating not only provides excellent anti-corrosion performance, but also has multiple functions such as antibacterial and environmental protection, is suitable for a variety of substrates and application scenarios, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious: Figure 1 It is a schematic diagram of the components of a graphene-modified environmentally friendly anti-corrosion coating of the present invention; Figure 2 It is a schematic process diagram of the preparation of the modified graphene dispersion in the present invention; Figure 3 It is a schematic process diagram of the preparation of a graphene-modified environmentally friendly anti-corrosion coating of the present invention. Detailed Implementation Modes

[0021] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.

[0022] As Figure 1 、 Figure 2 shown, the present invention provides a technical solution for a graphene-modified environmentally friendly anti-corrosion coating: a graphene-modified environmentally friendly anti-corrosion coating, which is composed of a modified graphene dispersion, waterborne polyurethane, anti-rust pigment, disinfectant, dispersant, defoamer, thickener and water, and includes the following mass percentages: The modified graphene dispersion is 25 - 35 parts, the waterborne polyurethane is 15 - 25 parts, the anti-rust pigment is 5 - 10 parts, the disinfectant is 0.5 - 2 parts, the dispersant is 0.5 - 1 part, the defoamer is 0.1 - 0.5 part, the thickener is 0.1 - 0.5 part, and the water is 30 - 40 parts; Among them, the modified graphene dispersion improves the dispersion of graphene through the hydrophilic groups on titanium dioxide, shields the diffusion path of the corrosive medium, and thus enhances the anti-corrosion performance of the coating. The hydrophilic groups are one or more of hydroxyl, carboxyl, amino or epoxy groups.

[0023] In order to extend the diffusion path of the corrosive medium, the preparation method of the modified graphene dispersion includes the following steps: S1. Mix graphene oxide and titanium dioxide evenly in a certain proportion; S2. Add the mixture obtained in S1 to an appropriate amount of deionized water to form a suspension, and through a chemical bonding reaction, make the hydrophilic groups in titanium dioxide covalently bond with the oxygen-containing groups on the surface of graphene oxide, thereby forming a molecular coating layer on the surface of graphene oxide, and then improving the dispersion and compatibility of graphene; S3. Transfer the suspension after the reaction in S2 to an ultrasonic machine for ultrasonic treatment. The ultrasonic treatment makes graphene oxide have excellent dispersion and stability in water, avoids the aggregation of graphene oxide sheets, and thus enhances the uniformity and stability of the coating; S4. Let the mixture after ultrasonic treatment in S3 stand for a period of time to ensure its stability, and prepare a modified graphene dispersion with excellent dispersion and stability.

[0024] In order to improve the dispersion and compatibility of graphene oxide, the modifier is titanium dioxide, the surface of which is rich in hydroxyl groups, which can chemically react with the hydroxyl, carboxyl and epoxy groups on the surface of graphene oxide, improve the dispersion of graphene oxide in water, and at the same time enhance the compatibility between graphene oxide and waterborne polyurethane.

[0025] In order to achieve chemical bonding, the hydroxyl groups on the surface of titanium dioxide can respectively form ether bonds, ester bonds and stable chemical bonds with the hydroxyl groups, carboxyl groups and epoxy groups on the surface of graphene oxide, thereby realizing chemical bonding.

[0026] In order to optimize the distribution and properties of graphene in the coating, the thickness of the graphene oxide is 1-5 layers, and the diameter of the graphene oxide is 0.5-30 μm.

[0027] In order to achieve antibacterial properties of the coating, the disinfectant is IPBC, which can effectively prevent the growth of microorganisms in the coating, thereby extending the service life of the coating.

[0028] In order to increase the corrosion resistance of the coating, the rust-inhibiting pigment is composite iron titanium powder, which has excellent corrosion resistance and can effectively prevent the corrosion of the metal surface and extend the service life of the metal.

[0029] In order to improve the rheological properties of the coating, the defoamer is SN154, the dispersant is sodium lignosulfonate, and the thickener is sodium polyacrylate.

[0030] As Figure 3 shown, in order to provide a method that is easy to prepare, the present application also provides a preparation method of a graphene-modified environmentally friendly anticorrosive coating, and the preparation method includes the following steps: S1. Raw material preparation: Weigh the required component raw materials according to the mass percentage. S2. Coating mixing: Add the weighed modified graphene dispersion, waterborne polyurethane, rust-inhibiting pigment, disinfectant, dispersant, defoamer, thickener and water into a high-speed mixer in sequence, and stir at 1000 rad / min to 1800 rad / min for 30-60 minutes to ensure that each component is evenly mixed. S3. Coating aging: Let the mixed coating stand at room temperature for aging for 24-48 hours to ensure that each component reacts fully to form a graphene-modified environmentally friendly anticorrosive coating.

[0031] According to the requirements of the present application for dispersibility, compatibility and environmental friendliness, the applications of several types of modifiers such as titanium dioxide, polyethylene glycol, chitosan, polyethyleneimine and epoxy resin in the present application are compared, and the comparison results are as follows: To sum up, titanium dioxide shows the best performance in terms of dispersibility, compatibility and environmental friendliness, and is particularly suitable for coating systems that require high dispersibility, stability and environmental protection performance. In contrast, other modifiers may have advantages in certain specific applications, but their comprehensive performance is inferior to that of titanium dioxide. Therefore, the modifier selected in the present application is titanium dioxide.

[0032] The preparation of the modified graphene dispersion in the present application adopts the following steps: S1. Mix graphene oxide and titanium dioxide in a ratio of 20:3; S2. Add the mixture obtained in S1 to an appropriate amount of deionized water (the ratio of deionized water to the mixture of graphene oxide and titanium dioxide is 3:1) to form a suspension, and through a chemical bonding reaction, make the hydrophilic groups in titanium dioxide covalently bond with the oxygen-containing groups on the surface of graphene oxide, thereby forming a molecular coating layer on the surface of graphene oxide; S3. Transfer the suspension after the reaction in S2 to an ultrasonic machine for ultrasonic treatment; S4. Let the mixture after ultrasonic treatment in S3 stand for a period of time to prepare a modified graphene dispersion liquid with excellent dispersibility and stability, Among them, the chemical bonding reaction in S2 can be one or more of the following three reactions, which include: the hydroxyl groups (-OH) on the surface of titanium dioxide and the hydroxyl groups (-OH) on the surface of graphene oxide undergo a dehydration condensation reaction to form an ether bond (TiO 2 -O-GO), thereby realizing chemical bonding; the hydroxyl groups (-OH) on the surface of titanium dioxide and the carboxyl groups (-COOH) on the surface of graphene oxide undergo an esterification reaction to form an ester bond (TiO 2 -O-COOH-GO), thereby realizing chemical bonding; the hydroxyl groups (-OH) on the surface of titanium dioxide and the epoxy groups (-O-) on the surface of graphene oxide undergo a ring-opening reaction to form a stable chemical bond (TiO 2 -O-CH 2 -CH 2 -O-GO), thereby realizing chemical bonding, where GO represents graphene oxide.

[0033] According to a preparation method of a graphene-modified environmentally friendly anti-corrosion coating shown in this application, it is divided into the following examples according to different component contents, and the specific contents are as follows: This application conducts performance tests on the modified environmentally friendly anti-corrosion coatings prepared in Example 1, Example 2, Example 3, Example 4, Example 5, and Example 6. The test items are: surface morphology test, adhesion, flexibility, hardness, salt spray resistance, conductivity, and elastic impact resistance. These test items comprehensively evaluate the physical, chemical, and mechanical properties of the graphene inorganic anti-corrosion coating to ensure that it can provide long-term and effective anti-corrosion protection in practical applications. The specific test results are as follows: In the surface topography test of the detection items of this application, means such as a scanning electron microscope (SEM) are used to observe the surface and cross-section topography of the coating, evaluate the uniformity, density of the coating, and whether there are defects such as pores and cracks; the adhesion is tested by the cross-cut method in accordance with the GB1720-1979 standard to ensure that the coating can firmly adhere to the metal surface and prevent the coating from peeling off due to insufficient adhesion; the flexibility is tested according to the GB / T1731-1993 standard to test the deformation ability of the coating under bending conditions and evaluate the flexibility and crack resistance of the coating; the hardness is tested by the pencil hardness method in accordance with the GB / T6739-2006 standard to evaluate the wear resistance and scratch resistance of the coating and ensure that the coating can resist external mechanical damage; the salt spray resistance is evaluated by the salt spray test in accordance with the GB / T10834—2008 standard to evaluate the corrosion resistance of the coating in a high-salinity environment; the conductivity is tested by measuring the surface resistivity of the coating in accordance with the ASTM D257—2007 standard to evaluate the conductive performance of the coating; the elastic impact resistance is tested according to the GB / T1732—1993 standard to test the elastic recovery ability of the coating under impact conditions and evaluate the toughness and impact resistance of the coating.

[0034] Example 1: Example 1 of this application is used as the basic formula to verify the basic anti-corrosion performance and environmental protection performance of the modified graphene dispersion in the coating, providing a control for subsequent optimization. The test results show that the formula has good adhesion of grade 0, flexibility of 2 mm, and salt spray resistance of 720 hours, further indicating the feasibility of using it as the basic formula.

[0035] Example 2: In Example 2 of this application, the content of the modified graphene dispersion is increased to 30 parts on the basis of the basic formula, and the other components are adjusted accordingly to study its effect on improving the anti-corrosion performance of the coating. The test results show that the adhesion remains at grade 0, the flexibility is improved to 1.5 mm, and the salt spray resistance is increased to 840 hours, indicating a significant improvement in anti-corrosion performance.

[0036] Example 3: In Example 3 of this application, the content of the waterborne polyurethane is increased to 22 parts on the basis of the basic formula, and at the same time, the content of the modified graphene dispersion is adjusted to 28 parts, and the other components are adjusted accordingly to study its effect on the film-forming performance and adhesion of the coating. The test results show that the adhesion slightly decreases to grade 1, but the flexibility is optimized to 1 mm, and the salt spray resistance is further increased to 960 hours, indicating that both the film-forming performance and corrosion resistance have been improved.

[0037] Example 4: In Example 4 of this application, the content of the rust inhibitor pigment was increased to 8 parts on the basis of the basic formulation, and the other components were adjusted accordingly to study its effect on improving the corrosion resistance of the coating. The test results showed that the salt spray resistance was significantly improved to 1080 hours, the adhesion remained at Grade 1, and the flexibility was maintained at 1 mm, proving that the rust prevention performance was significantly enhanced.

[0038] Example 5: In Example 5 of this application, the content of the disinfectant was increased to 1 part on the basis of the basic formulation, and the other components were adjusted accordingly to study its effect on improving the antibacterial performance of the coating. The test results showed that the surface resistivity was optimized to 7×10 5 Ω, the adhesion remained at Grade 0, the flexibility was 1.5 mm, and the salt spray resistance was 840 hours, indicating that both the antibacterial performance and the conductivity were improved.

[0039] Example 6: In Example 6 of this application, the contents of each component were comprehensively optimized to study its effect on improving the comprehensive performance of the coating (such as anti-corrosion, antibacterial, environmental protection, construction performance, etc.) to find the best formulation. The test results showed that the adhesion remained at Grade 0, the flexibility was optimized to 1 mm, the hardness was increased to 4H, the salt spray resistance was as high as 1200 hours, the surface resistivity was reduced to 2×10 5 Ω, and the impact resistance was increased to 70 kg·cm, indicating that this formulation performed excellently in terms of anti-corrosion, antibacterial, environmental protection and construction performance, and was the best formulation at present.

[0040] This application will perform ultrasonic treatment on the mixture after the reaction of graphene oxide and the modifier to obtain a modified graphene dispersion. Among them, ultrasonic treatment can not only break the van der Waals force between the graphene oxide sheets to prevent sheet agglomeration, but also further enhance the chemical bonding between the modifier and graphene oxide, improving the stability of the dispersion. In this processing, an ultrasonic power of 200 - 500 W can be used, and the treatment time is 30 - 60 minutes. And the temperature should be controlled well during the treatment to avoid performance degradation of the material caused by overheating.

[0041] This application utilizes the excellent barrier performance of the modified graphene dispersion and the hydrophilic groups of the modifier to extend the diffusion path of the corrosive medium, significantly improving the anti-corrosion performance of the coating. The use of rust inhibitor pigments such as composite iron-titanium powder further enhances the corrosion resistance of the coating.

[0042] In this application, the modified graphene dispersion ensures excellent dispersibility and stability of graphene in water through chemical bonding reaction and ultrasonic treatment, avoiding the agglomeration of graphene sheets, thereby enhancing the uniformity and stability of the coating.

[0043] This application uses waterborne polyurethane as the film-forming substance, which is more environmentally friendly. At the same time, environmentally friendly pigments such as composite iron titanate powder are selected as the rust-inhibiting pigments, avoiding the use of traditional chromate pigments and reducing environmental pollution. The addition of the disinfectant IPBC also meets environmental protection standards, ensuring that the impact of the coating on the environment and human health is minimized during use.

[0044] By optimizing the proportions of each component and the preparation process, this application reduces unnecessary components, lowers production costs, and at the same time improves the comprehensive performance of the coating, having good economic efficiency and market competitiveness. This coating not only provides excellent anti-corrosion performance but also has multiple functions such as antibacterial and environmental protection, and is applicable to a variety of substrates and application scenarios, having a broad application prospect.

[0045] The foregoing has shown and described 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-described exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. 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, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0046] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an 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 graphene-modified environmentally friendly anti-corrosion coating, characterized in that: The graphene-modified environmentally friendly anti-corrosion coating is composed of modified graphene dispersion, water-based polyurethane, anti-rust pigment, disinfectant, dispersant, defoamer, thickener and water, which include the following mass percentages: The modified graphene dispersion is 25-35 parts, the water-based polyurethane is 15-25 parts, the anti-rust pigment is 5-10 parts, the disinfectant is 0.5-2 parts, the dispersant is 0.5-1 parts, the defoamer is 0.1-0.5 parts, the thickener is 0.1-0.5 parts, and the water is 30-40 parts; The preparation method of the modified graphene dispersion comprises the following steps: S1. Mixing graphene oxide and titanium dioxide in a certain proportion; S2, adding the mixture obtained in S1 to an appropriate amount of deionized water to form a suspension, and causing the hydrophilic groups in the titanium dioxide to covalently bond with the oxygen-containing groups on the surface of the graphene oxide through a chemical bonding reaction, thereby forming a molecular coating layer on the surface of the graphene oxide; S3, transferring the suspension after the reaction in S2 to an ultrasonic machine for ultrasonic treatment; S4. Let the mixture after ultrasonic treatment in S3 stand for a period of time to prepare a modified graphene dispersion with excellent dispersibility and stability.

2. The graphene-modified environmentally friendly anti-corrosion coating according to claim 1, characterized in that: The titanium dioxide is a modifier, and its surface is rich in hydroxyl groups that can chemically react with hydroxyl groups, carboxyl groups or epoxy groups on the surface of graphene oxide.

3. The graphene-modified environmentally friendly anti-corrosion coating according to claim 1, characterized in that: The thickness of the graphene oxide is 1-5 layers, and the diameter of the graphene oxide is 0.5-30 μm.

4. The graphene-modified environmentally friendly anti-corrosion coating according to claim 1, characterized in that: The disinfectant is IPBC.

5. The graphene-modified environmentally friendly anti-corrosion coating according to claim 1, characterized in that: The anti-rust pigment is composite iron-titanium powder.

6. The graphene-modified environmentally friendly anti-corrosion coating according to claim 1, characterized in that: The defoamer is SN154, the dispersant is sodium lignin sulfonate, and the thickener is sodium polyacrylate.

7. A method for preparing a graphene-modified environmentally friendly anti-corrosion coating, for preparing the graphene-modified environmentally friendly anti-corrosion coating as described in any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Raw material preparation: weigh the required raw materials according to mass percentage; S2, coating mixing: add the weighed modified graphene dispersion, waterborne polyurethane, anti-rust pigment, disinfectant, dispersant, defoamer, thickener and water into a high-speed mixer in sequence, and stir at 1000rad / min to 1800rad / min for 30-60 minutes to ensure that the components are evenly mixed; S3. Paint aging: The mixed paint is left to mature at room temperature for 24-48 hours to ensure that all components react fully to form a graphene-modified environmentally friendly anti-corrosion paint.

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