Graphene inorganic anticorrosive paint and preparation method thereof

Abstract

The invention relates to a graphene inorganic anticorrosive coating which is prepared from the following components in percentage by mass: 25-35wt% of graphene dispersion liquid, 10-15wt% of silica sol, 3-5wt% of nano zinc oxide, 8-12wt% of thiabendazole, 10-15wt% of fluazinam, 10-15wt% of pigment, 10-15wt% of sodium polyacrylate, 10-15wt% of talcum powder, 10-15wt% of auxiliaries and the balance of tap water. The graphene inorganic anticorrosive paint is prepared from, by weight, 1-5% of fluazinam, 3-7% of pigment, 0.2-0.6% of sodium polyacrylate, 2-8% of talcum powder, 5-10% of auxiliaries and 30% of tap water, the graphene inorganic anticorrosive paint has excellent oxidation resistance and oxygen diffusion resistance and can effectively block invasion of corrosive substances, a generated coating has long-term stability and durability, the maintenance cost and frequency are reduced, the preparation process is simple, and the graphene inorganic anticorrosive paint is suitable for industrial production. Organic volatile matters are less discharged, and the method is green and environment-friendly.

Description

Technical Field

[0001] The invention discloses a graphene inorganic anticorrosive coating and a preparation method thereof, belonging to the field of coatings. Background Art

[0002] Corrosion has always been the biggest challenge faced by industries such as machinery, chemical industry, construction, and transportation. Compared with conventional anti-corrosion coatings, heavy-duty anti-corrosion coatings can be used in relatively harsh corrosive environments and have a longer protection period than conventional anti-corrosion coatings. Among them, epoxy zinc-rich coatings are the most common type of heavy-duty anti-corrosion coatings and have been widely used in the field of anti-corrosion. However, a large amount of organic solvents volatilized into the atmosphere during the coating process of epoxy zinc-rich coatings pollute the atmospheric environment. At the same time, its high zinc content puts continuous pressure on the cost of coatings. With the increasing requirements for environmental protection, energy conservation, and emission reduction, the modification of epoxy zinc-rich heavy-duty anti-corrosion coatings has been put on the agenda.

[0003] Graphene is a two-dimensional carbon nanomaterial with excellent physical and chemical properties, such as excellent antioxidant properties and oxygen diffusion resistance. It can be used as a filler in anti-corrosion coatings like mica, aluminum powder, glass flakes, etc., and improve the overall physical and chemical properties of the coating. At the same time, graphene with a huge specific surface area can be transformed into graphene oxide rich in epoxy, hydroxyl, and carboxyl groups or re-functionalized as a carrier to introduce other functional materials, such as silicone-acrylic emulsions with passivating anti-corrosion effects, to form multiple physical and chemical protections, which are more suitable for marine environment corrosion protection. At the same time, it replaces heavy metals or toxic substances such as lead, zinc or chromates in traditional coatings. The composite materials formed can not only significantly improve the anti-corrosion effect, but also improve the environmental performance of the coating to a certain extent. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a graphene inorganic anti-corrosion coating and a preparation method thereof, so as to solve the technical problem that the existing anti-corrosion coating lacks a primer with low zinc content, good flexibility and good anti-corrosion effect.

[0005] In order to achieve the above object, the present invention is implemented by the following technical scheme: a graphene inorganic anticorrosion coating, which is composed of graphene dispersion, silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc, additives and tap water, and includes the following mass percentages: The graphene dispersion is 25-35wt%, and the graphene dispersion is used to improve the anti-corrosion and mechanical properties of the coating. The silica sol is 10-15wt%, and the silica sol is used to enhance the adhesion and salt spray resistance of the coating. The nano zinc oxide is 3-5wt%, and the nano zinc oxide is used to absorb ultraviolet rays and improve the conductivity and antibacterial properties of the coating. The thiabendazole is 8-12wt%, and thiabendazole is used as a fungicide to prevent the growth of microorganisms. The fluazinam is 1-5wt%, and the fluazinam is used as a fungicide to prevent the growth of microorganisms. The pigment is 3-7wt%, and the pigment is used to reflect ultraviolet rays and enhance the protective performance. The sodium polyacrylate is 0.2-0.6wt%, and the sodium polyacrylate is used as a dispersant to ensure uniform dispersion of the components. The talc is 2-8wt%, and the talc is used to improve the hardness and wear resistance of the coating. The additive is 5-10wt%, and the additive is used to eliminate bubbles and accelerate the drying speed. The tap water is 30wt%, and the tap water is used to adjust the viscosity of the coating. Among them, the graphene dispersion uses a specific dispersant and graphene to form a covalent bond, so that the graphene is stably and evenly distributed in the coating for a long time, and the shielding effect is good.

[0006] Furthermore, the graphene dispersion is composited by silicone-acrylic emulsion, graphene oxide and water, wherein the mass proportion of silicone-acrylic emulsion is 20-28%, the mass proportion of graphene oxide is 0.5-2%, and the rest is water.

[0007] Furthermore, the auxiliary agent is mainly a defoamer and a drying agent, wherein the defoamer is SN154 and the drying agent is a composite of cobalt and calcium in a ratio of 1:1.

[0008] Furthermore, the maximum particle size of the nano zinc oxide is less than 80 nm.

[0009] Furthermore, the thickness of the graphene is 3-7 layers, and the diameter of the graphene sheet is 5 μm to 30 μm.

[0010] Furthermore, the pigment is one of mica iron oxide, titanium dioxide, red iron oxide, and zinc oxide, preferably mica iron oxide.

[0011] A method for preparing a graphene inorganic anti-corrosion coating, the method comprising the following steps: S1. Raw material preparation: weigh the required raw materials according to mass percentage; S2. Preparation of graphene dispersion: mixing graphene with silicone-acrylic emulsion by ultrasonic-assisted solution blending, dispersing and stirring the mixture by ultrasonic, diluting the mixture in water, and stirring to obtain graphene dispersion; S3, preparation of mixed material: pour silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc and additives into water by coating multi-component coupling optimization method, and stir at high speed to fully mix the components to form a uniform mixed material; S4, preparation of anti-corrosion coating: adding graphene dispersion to the mixed material, stirring at high speed to fully blend the graphene dispersion with other components, and finally obtaining a graphene inorganic anti-corrosion coating with excellent performance; S5. Performance testing: performing performance testing on the obtained graphene inorganic anti-corrosion coating.

[0012] Furthermore, the graphene dispersion preparation step further includes the following steps: S21, pouring graphene into silicone-acrylic emulsion, and ultrasonically dispersing for 30 min to 40 min to fully disperse the graphene in the silicone-acrylic emulsion to form a uniform mixed system; S22, stirring the mixed system obtained in S21 at 40° C. to 50° C. and 1000 rad / min to 1200 rad / min for 30 min to fully combine the graphene and the silicone-acrylic emulsion to obtain a stable graphene-silicone-acrylic emulsion; S23, pouring the graphene-silicone acrylic emulsion obtained in S22 into water, and continuing to stir for 30 minutes under the condition of 1000 rad / min to 1200 rad / min to evenly disperse the graphene-silicone acrylic emulsion in the water, and finally obtaining a graphene dispersion.

[0013] Furthermore, in the step of preparing the mixed material, a coating multi-component coupling optimization method is adopted, and through the synergistic effect and efficient mixing of multiple components, the comprehensive performance of the coating is optimized, and its protective effect in practical application is improved.

[0014] The beneficial effects of the present invention are: 1. This application has excellent anti-corrosion performance. Through the covalent bond formed by the specific dispersant and graphene, the graphene is evenly and stably distributed in the coating, exerting its excellent antioxidant and oxygen diffusion resistance, and can effectively block the invasion of corrosive substances. At the same time, nano zinc oxide can absorb ultraviolet rays, improve the conductivity and antibacterial properties of the coating, and significantly improve the corrosion resistance of the coating.

[0015] 2. This application adds graphene to enhance the hardness and wear resistance of the coating, which can better resist external mechanical damage. In addition, graphene can be evenly and stably distributed in the coating for a long time, ensuring the long-term stability and durability of the coating and reducing maintenance costs and frequency.

[0016] 3. The present invention has low emission of volatile organic matter during the preparation process, is green and environmentally friendly, reduces pollution to the environment, has a simple preparation process, and has low cost, is suitable for large-scale production and application, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of components of a graphene inorganic anti-corrosion coating of the present invention; Figure 2 The figure is a schematic flow chart of a method for preparing a graphene inorganic anti-corrosion coating according to the present invention; Figure 3 It is a schematic diagram of the detailed process of preparing the graphene dispersion in the present invention. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0019] like Figure 1 As shown, the present invention provides a technical solution of a graphene inorganic anticorrosive coating: the graphene inorganic anticorrosive coating is composed of a graphene dispersion, silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc, additives and tap water, and includes the following mass percentages: The graphene dispersion is 25-35wt%, and the graphene dispersion is used to improve the anti-corrosion and mechanical properties of the coating. The silica sol is 10-15wt%, and the silica sol is used to enhance the adhesion and salt spray resistance of the coating. The nano zinc oxide is 3-5wt%, and the nano zinc oxide is used to absorb ultraviolet rays and improve the conductivity and antibacterial properties of the coating. The thiabendazole is 8-12wt%, and thiabendazole is used as a fungicide to prevent the growth of microorganisms. The fluazinam is 1-5wt%, and the fluazinam is used as a fungicide to prevent the growth of microorganisms. The pigment is 3-7wt%, and the pigment is used to reflect ultraviolet rays and enhance the protective performance. The sodium polyacrylate is 0.2-0.6wt%, and the sodium polyacrylate is used as a dispersant to ensure uniform dispersion of the components. The talc is 2-8wt%, and the talc is used to improve the hardness and wear resistance of the coating. The additive is 5-10wt%, and the additive is used to eliminate bubbles and accelerate the drying speed. The tap water is 30wt%, and the tap water is used to adjust the viscosity of the coating. Among them, the graphene dispersion uses a specific dispersant and graphene to form a covalent bond, so that the graphene is stably and evenly distributed in the coating for a long time, and the shielding effect is good.

[0020] In order to ensure the stability and performance of the graphene dispersion, the graphene dispersion is composed of a silicone-acrylic emulsion, graphene oxide and water, wherein the mass proportion of the silicone-acrylic emulsion is 20-28%, the mass proportion of the graphene oxide is 0.5-2%, and the rest is water.

[0021] In order to improve the construction performance and drying efficiency of the coating, the auxiliary agents are mainly defoamers and drying agents, wherein the defoamer is SN154 and the drying agent is a 1:1 composite of cobalt and calcium.

[0022] In order to enhance the dispersibility of nano zinc oxide in the coating, the maximum particle size of the nano zinc oxide is less than 80 nm.

[0023] In order to optimize the distribution and performance of graphene in the coating, the thickness of the graphene is 3-7 layers, and the diameter of the graphene sheet is 5 μm to 30 μm.

[0024] In order to improve the hiding power and protective properties of the pigment, the pigment is one of mica iron oxide, titanium dioxide, red iron oxide, and zinc oxide, and the pigment is preferably mica iron oxide.

[0025] like Figure 2 and Figure 3 As shown, in order to provide an efficient preparation method, the present application also provides a method for preparing a graphene inorganic anti-corrosion coating, the method comprising the following steps: S1. Raw material preparation: weigh the required raw materials according to mass percentage; S2. Preparation of graphene dispersion: mixing graphene with silicone-acrylic emulsion by ultrasonic-assisted solution blending, dispersing and stirring the mixture by ultrasonic, diluting the mixture in water, and stirring to obtain graphene dispersion; S3, preparation of mixed material: pour silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc and additives into water by coating multi-component coupling optimization method, and stir at high speed to fully mix the components to form a uniform mixed material; S4, preparation of anti-corrosion coating: adding graphene dispersion to the mixed material, stirring at high speed to fully blend the graphene dispersion with other components, and finally obtaining a graphene inorganic anti-corrosion coating with excellent performance; S5. Performance testing: performing performance testing on the obtained graphene inorganic anti-corrosion coating.

[0026] In order to obtain the graphene dispersion, the graphene dispersion preparation step further includes the following steps: S21, pouring graphene into silicone-acrylic emulsion, and ultrasonically dispersing for 30 min to 40 min to fully disperse the graphene in the silicone-acrylic emulsion to form a uniform mixed system; S22, stirring the mixed system obtained in S21 at 40° C. to 50° C. and 1000 rad / min to 1200 rad / min for 30 min to fully combine the graphene and the silicone-acrylic emulsion to obtain a stable graphene-silicone-acrylic emulsion; S23, pouring the graphene-silicone acrylic emulsion obtained in S22 into water, and continuing to stir for 30 minutes under the condition of 1000 rad / min to 1200 rad / min to evenly disperse the graphene-silicone acrylic emulsion in the water, and finally obtaining a graphene dispersion.

[0027] In order to optimize the preparation process of the mixed material, a coating multi-component coupling optimization method is adopted in the mixed material preparation step. Through the synergistic effect and efficient mixing of multiple components, the comprehensive performance of the coating is optimized and its protective effect in practical applications is improved.

[0028] According to the preparation method of a graphene inorganic anticorrosive coating presented in this application, it is divided into the following embodiments according to the different component contents, and the specific contents are as follows: A preparation process of graphene inorganic anti-corrosion coating is as follows: 1. Coating preparation: The preparation of the anti-corrosion coating includes the following steps: (1) Preparation of graphene dispersion: Graphene and silicone-acrylic emulsion are mixed by ultrasonic-assisted solution blending, and after ultrasonic dispersion and stirring, the obtained mixture is diluted in water and stirred to obtain a graphene dispersion; (2) Preparation of mixed materials: silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc, and additives are poured into water by using a coating multi-component coupling optimization method, and the components are fully mixed by high-speed stirring to form a uniform mixed material; (3) Preparation of anti-corrosion coating: Add graphene dispersion to the mixed material and stir at high speed to allow the graphene dispersion and other components to fully blend, ultimately obtaining a graphene inorganic anti-corrosion coating with excellent performance.

[0029] 2. Performance testing: The performance of graphene inorganic anti-corrosion coatings is tested. The main test items include surface morphology test, adhesion, flexibility, hardness, salt spray resistance, conductivity, and elastic impact.

[0030] Example 1: As a basic formula, the synergistic effect of graphene dispersion, silica sol and other components is verified to ensure the basic anti-corrosion performance and construction performance of the coating. The proportion of additives (defoaming agent, drying agent, etc.) is relatively high, and the influence of additives on the construction performance of the coating (such as defoaming, drying speed) can be verified. The proportion of thiabendazole and fluazinam is relatively low, which can be used to verify whether a low content of antifouling agent is sufficient to meet the antifouling requirements of the marine environment. This Example 1 has good basic anti-corrosion performance, but the antifouling performance and pigment hiding power may be relatively weak. Among them, the mixing ratio of graphene to silicone acrylic emulsion is 1:12, and the mixing ratio of defoaming agent to drying agent is 1:1.

[0031] Example 2: Based on Example 1, the ratio of thiabendazole and fluazinam is increased, which further optimizes the improvement of antifouling performance. The proportion of additives is reduced from 10% to 7%, which can verify the necessity of additives and the impact on costs. The pigment ratio is increased from 3% to 3.6%, which can verify the improvement of pigments on coating hiding power and aesthetics. In this Example 2, the antifouling performance and pigment hiding power are improved. At the same time, the reduction of additives can reduce costs, but may have a certain impact on construction performance. Among them, the mixing ratio of graphene and silicone acrylic emulsion is 1:12, and the mixing ratio of defoaming agent and drying agent is 1:1.

[0032] Example 3: On the basis of Example 2, the proportion of graphene dispersion was increased to 26%. In order to verify the effect of graphene content on the shielding performance of the coating, the proportion of silica sol was reduced from 15% to 10%. In order to verify whether the reduction of silica sol would affect the adhesion and salt spray resistance of the coating, the proportion of thiabendazole and fluazinam was further increased. In order to verify whether a higher content of antifouling agent could significantly improve the antifouling performance, the pigment proportion was increased from 3.6% to 4%. In order to further optimize the covering power and aesthetics of the coating, the increase in graphene content in this Example 3 can improve the shielding performance, and the antifouling performance is further enhanced, but the reduction of silica sol may have a certain effect on the adhesion and salt spray resistance. Among them, the mixing ratio of graphene to silicone acrylic emulsion is 1:12, and the mixing ratio of defoamer and drying agent is 1:1.

[0033] Example 4: On the basis of Example 2, the proportion of graphene dispersion reaches 28%. In order to verify the improvement of shielding performance and conductivity of coating by high content of graphene, the proportion of silica sol is reduced from 15% to 11%. In order to verify whether the reduction of silica sol will affect the adhesion and salt spray resistance of coating, the proportion of thiabendazole and fluazinam is further reduced. In order to verify the effect of lower content of antifouling agent on antifouling performance, the proportion of pigment is increased from 3.6% to 5.4%. In order to further optimize the covering power and aesthetics of coating, the increase of graphene content in this Example 4 can improve shielding performance, and antifouling performance is further enhanced, but the reduction of silica sol may have a certain effect on adhesion and salt spray resistance. Among them, the mixing ratio of graphene and silicone acrylic emulsion is 1:12, and the mixing ratio of defoamer and drying agent is 1:1.

[0034] The present application performs performance tests on the graphene inorganic anticorrosive coatings prepared in Example 1, Example 2, Example 3 and Example 4, and the test items are: surface morphology test, adhesion, flexibility, hardness, salt spray resistance, conductivity, elastic impact resistance, wherein the surface morphology test is to observe the surface and cross-sectional morphology of the coating by means of scanning electron microscopy (SEM) and the like, and evaluate the uniformity, density and presence of defects such as pores and cracks in the coating; the adhesion is tested according to GB1720-1979 standard, by the cross-hatch method to test the adhesion between the coating and the substrate, to ensure that the coating can be firmly Adhere to the metal surface to prevent the coating from peeling off due to insufficient adhesion; flexibility is based on GB / T1731-1993 standard, testing the deformation ability of the coating under bending conditions, evaluating the flexibility and crack resistance of the coating; hardness is based on GB / T6739-2006 standard, using the pencil hardness method to test the hardness of the coating, evaluating the wear resistance and scratch resistance of the coating, and ensuring that the coating can resist external mechanical damage; salt spray resistance is based on GB / T10834-2008 standard, and the corrosion resistance of the coating in a high salinity environment is evaluated through a salt spray test; conductivity is based on ASTM D257-2007 standard, testing the surface resistivity of the coating, and evaluating the conductivity of the coating; elastic impact is based on GB / T 1732-1993 standard, testing the elastic recovery ability of the coating under impact conditions, and evaluating the toughness and impact resistance of the coating. These test items comprehensively evaluate the physical, chemical and mechanical properties of graphene inorganic anti-corrosion coatings to ensure that they can provide long-term and effective anti-corrosion protection in practical applications. The specific test results are as follows: In summary, the test results according to these embodiments show that the graphene inorganic anti-corrosion coating of the present application not only fully complies with national standards, but also performs well in key performance indicators, and can provide long-term and reliable anti-corrosion protection for steel structures in marine environments.

[0035] In the preparation of graphene dispersion in the present application, ultrasound-assisted solution blending plays a vital role. Through the cavitation effect and mechanical vibration of ultrasound, graphene can be evenly dispersed in the silicone-acrylic emulsion to form a stable mixed system. Specifically, the high-frequency vibration of ultrasound enables the graphene to be dispersed at the molecular level in the silicone-acrylic emulsion, effectively avoiding agglomeration and significantly improving the dispersion efficiency and quality. At the same time, the action of ultrasound also enhances the interaction between graphene and silicone-acrylic emulsion molecules, making the two more closely combined. The resulting graphene-silicone-acrylic emulsion has good stability and long-term storage performance. Furthermore, the mixed solution is diluted in water and stirred, and the resulting graphene dispersion can fully maintain the physical and chemical properties of graphene, such as antioxidant properties, diffusion resistance, etc., thereby significantly improving the corrosion resistance and mechanical properties of the coating. In summary, the ultrasound-assisted solution blending method ensures the high quality and high performance of the graphene dispersion, laying a solid foundation for the subsequent preparation of coatings.

[0036] The present application adopts a coating multi-component coupling optimization method in the preparation of the mixed material, and adds multiple functional components such as silica sol, nano zinc oxide, thiophanate-methyl, fluazinam, pigments, sodium polyacrylate, talc and additives into water at the same time, and fully mixes them through high-speed stirring to ensure the uniform dispersion of each component in the water, avoid the sedimentation and aggregation of the components, ensure the stability and construction performance of the coating, and enable these components to play their own specific functions in the coating. For example, silica sol and nano zinc oxide improve the adhesion and salt spray resistance of the coating, the bactericide prevents the growth of microorganisms, and the pigment provides covering power and protective performance. Through the synergistic effect of multiple components, the comprehensive performance of the coating is significantly improved.

[0037] This application has excellent anti-corrosion performance. Through the covalent bond formed by a specific dispersant and graphene, the graphene is evenly and stably distributed in the coating, exerting its excellent antioxidant and oxygen diffusion resistance, and can effectively block the invasion of corrosive substances. At the same time, nano zinc oxide can absorb ultraviolet rays, improve the conductivity and antibacterial properties of the coating, and significantly improve the corrosion resistance of the coating.

[0038] The present application adds graphene to enhance the hardness and wear resistance of the coating, which can better resist external mechanical damage. In addition, graphene can be evenly and stably distributed in the coating for a long time, ensuring the long-term stability and durability of the coating and reducing maintenance costs and frequency.

[0039] The present invention has low emission of volatile organic matter during the preparation process, is green and environmentally friendly, reduces pollution to the environment, has a simple preparation process, is low in cost, is suitable for large-scale production and application, and has significant economic and social benefits.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A graphene inorganic anticorrosion coating, characterized in that: The graphene inorganic anticorrosive coating is composed of graphene dispersion, silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talcum powder, additives and tap water, and includes the following mass percentages: Graphene dispersion is 25-35wt%, silica sol is 10-15wt%, nano zinc oxide is 3-5wt%, thiabendazole is 8-12wt%, fluazinam is 1-5wt%, pigment is 3-7wt%, sodium polyacrylate is 0.2-0.6wt%, talc is 2-8wt%, additives are 5-10wt%, and tap water is 30wt%; Among them, the graphene dispersion uses a specific dispersant to form a covalent bond with graphene, so that the graphene is stably and evenly distributed in the coating for a long time, and the shielding effect is good; The graphene dispersion is composed of a silicone-acrylic emulsion, graphene and water, wherein the mass proportion of the silicone-acrylic emulsion is 20-28%, the mass proportion of the graphene is 0.5-2%, and the rest is water.

2. The graphene inorganic anticorrosion coating according to claim 1, characterized in that: The auxiliary agents are mainly defoamers and drying agents, wherein the defoamer is SN154 and the drying agent is a composite of cobalt and calcium in a ratio of 1:

1.

3. The graphene inorganic anticorrosive coating according to claim 1, characterized in that: The maximum particle size of the nano zinc oxide is less than 80 nm.

4. The graphene inorganic anticorrosive coating according to claim 1, characterized in that: The thickness of the graphene is 3-7 layers, and the diameter of the graphene sheet is 5 μm to 30 μm.

5. The graphene inorganic anticorrosive coating according to claim 1, characterized in that: The pigment is one of mica iron oxide, titanium dioxide, red iron oxide and zinc oxide.

6. A method for preparing a graphene inorganic anticorrosion coating, for preparing the graphene inorganic anticorrosion coating as described in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1. Raw material preparation: weigh the required raw materials according to mass percentage; S2. Preparation of graphene dispersion: mixing graphene with silicone-acrylic emulsion by ultrasonic-assisted solution blending, dispersing and stirring the mixture by ultrasonic, diluting the mixture in water, and stirring to obtain graphene dispersion; S3, preparation of mixed material: pour silica sol, nano zinc oxide, thiabendazole, fluazinam, pigment, sodium polyacrylate, talc and additives into water by coating multi-component coupling optimization method, and stir at high speed to fully mix the components to form a uniform mixed material; S4, preparation of anti-corrosion coating: adding graphene dispersion to the mixed material, stirring at high speed to fully blend the graphene dispersion with other components, and finally obtaining a graphene inorganic anti-corrosion coating with excellent performance; S5. Performance testing: performing performance testing on the obtained graphene inorganic anti-corrosion coating.

7. The method for preparing the graphene inorganic anticorrosive coating according to claim 6, characterized in that: The graphene dispersion preparation step further comprises the following steps: S21, pouring graphene into silicone-acrylic emulsion, and ultrasonically dispersing for 30 min to 40 min to fully disperse the graphene in the silicone-acrylic emulsion to form a uniform mixed system; S22, stirring the mixed system obtained in S21 at 40° C. to 50° C. and 1000 rad / min to 1200 rad / min for 30 min to fully combine the graphene and the silicone-acrylic emulsion to obtain a stable graphene-silicone-acrylic emulsion; S23, pouring the graphene-silicone acrylic emulsion obtained in S22 into water, and continuing to stir for 30 minutes under the condition of 1000 rad / min to 1200 rad / min to evenly disperse the graphene-silicone acrylic emulsion in the water, and finally obtaining a graphene dispersion.

8. The method for preparing the graphene inorganic anticorrosive coating according to claim 6, characterized in that: In the mixed material preparation step, a coating multi-component coupling optimization method is adopted.

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