Water-based polyurea-based grounding conductive anticorrosive coating film and preparation process thereof

Abstract

The invention relates to the field of grounding conductive anticorrosive coatings and grounding materials thereof, in particular to a water-based polyurea-based grounding conductive anticorrosive coating and a preparation process thereof. The coating film is composed of a water-based polyurea emulsion, graphene with the surface coated with gallic acid doped polypyrrole, graphite, deionized water and an auxiliary agent, and all the components are proportioned according to specific mass parts. By optimizing the formula and the preparation process, the coating film has excellent corrosion resistance and low-resistance conductivity, and can effectively prevent soil corrosion medium from permeating and provide a good diffusion effect. The preparation process is simple, the raw materials are easy to obtain, the cost is low, and the material is suitable for galvanized steel, copper-clad steel and other metal grounding materials. The coating film is compact and uniform, has salt mist resistance of more than or equal to 800h, volume resistivity of less than or equal to 20 omega.cm and adhesive force of less than or equal to grade 1, is environment-friendly, does not release VOCs, and has important industrial application value.

Description

Technical Field

[0001] The present invention relates to the field of grounding conductive anti-corrosion coatings and grounding materials thereof, and in particular to a water-based polyurea-based grounding conductive anti-corrosion coating and a preparation process thereof. Background Art

[0002] Grounding technology is a crucial foundational measure for the safe, reliable, and efficient operation of power grids, and is integrated into every aspect of power generation, transmission, distribution, and consumption. Its core role is reflected in several key areas: When insulation damage causes electrical equipment to become live, grounding quickly diverts leakage current to the earth, ensuring personal safety. By stabilizing grid voltage, grounding prevents abnormal voltage increases in the system under asymmetrical loads or fault conditions. Furthermore, grounding effectively guides lightning current into the ground, protecting equipment from overvoltage breakdown. It also suppresses system operating overvoltage and static electricity accumulation, and provides a low-impedance path for current flow in the event of a short-circuit fault, triggering protective devices.

[0003] However, with the rapid expansion of the power grid, the geographical environment in which grounding materials are located has become increasingly complex, including oceans, lakes, mountains, saline-alkali lands, and deserts. These environments pose severe challenges to traditional metal grounding materials. For example, oceans and saline-alkali areas are highly corrosive, which can easily lead to degradation of the performance of grounding materials; while the soil resistivity in mountainous and desert areas is high, which increases the difficulty of current dispersion. At present, traditional metal grounding electrodes generally have a service life that is far lower than the design life of the power grid. The main reason is that metal materials are prone to corrosion when exposed to the soil environment for a long time, which in turn leads to increased grounding resistance and poor current dispersion, becoming a key problem restricting the safe operation of the power grid. Therefore, the development of new grounding materials with both anti-corrosion and resistance reduction functions is of great significance to improving the service life of the grounding grid.

[0004] In the existing technology, although some coating materials have been attempted to be applied to the surface of metal grounding electrodes to improve their corrosion resistance and conductivity, these materials often have shortcomings. For example, some coatings have poor density and cannot effectively prevent the penetration of corrosive media in the soil, resulting in limited protection effects; other coatings have uneven distribution of conductive fillers or insufficient interfacial bonding, which affects the overall conductivity and mechanical strength. In addition, many traditional coating materials release volatile organic compounds (VOCs) during the preparation and construction process, causing environmental pollution, and their high cost limits large-scale application. In response to the above problems, there is an urgent need for an environmentally friendly, high-performance grounding conductive anti-corrosion coating that can provide long-term corrosion protection and conductive dispersion under complex and harsh actual working conditions to meet the high standards of modern power grids for grounding materials. Summary of the Invention

[0005] This invention addresses the issues of insufficient corrosion resistance, unstable conductivity, and environmental pollution associated with long-term use of existing conductive anticorrosive coatings for grounding in complex soil environments. By developing a water-based polyurea-based conductive anticorrosive coating for grounding and its preparation process, the invention proposes a water-based polyurea-based conductive anticorrosive coating for grounding and its preparation process. Through its specific composition and preparation method, the coating achieves the technical benefits of both excellent corrosion resistance and low-resistance conductivity.

[0006] The technical solution of the present invention is: The present invention provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of an organic film-forming substance, a filler, a diluent and an auxiliary agent, and the components are specifically as follows in parts by mass: the organic film-forming substance is a water-based polyurea emulsion, with a mass fraction of 100 parts; the filler comprises graphene with a surface coated with gallic acid-doped polypyrrole and graphite, wherein the mass fraction of the graphene with a surface coated with gallic acid-doped polypyrrole is 0.1-1 parts, and the mass fraction of the graphite is 60-105 parts; the diluent is deionized water, with a mass fraction of 5-65 parts; the auxiliary agent comprises a defoamer, a leveling agent, a wetting and dispersing agent and a film-forming auxiliary agent, wherein the mass fraction of the defoamer is 0.2-1 parts, the mass fraction of the leveling agent is 0.3-0.8 parts, the mass fraction of the wetting and dispersing agent is 0.5-1.5 parts, and the mass fraction of the film-forming auxiliary agent is 0.5-2 parts. The filler is uniformly dispersed in the organic film-forming matrix to form a continuous and dense conductive network structure.

[0007] Furthermore, in the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating, the solid content of the water-based polyurea emulsion is in the range of 45%-60%, the tensile strength is 25-30 MPa, and the elongation at break is greater than 300%, thereby ensuring that the coating has good mechanical properties and flexibility.

[0008] Furthermore, in the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating, the surface-coated graphene powder with gallic acid-doped polypyrrole has a fineness of 300-500 mesh.

[0009] Furthermore, in the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating, the carbon content of the graphite is not less than 99%, and the powder fineness is between 500-2000 mesh.

[0010] Furthermore, in the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating, the conductivity of the deionized water is not greater than 0.1ms / m, so as to reduce the influence of impurities on the coating performance.

[0011] Furthermore, in the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating, among the additives, the defoaming agent is TEGO-902W, the leveling agent is BYK-381, the wetting and dispersing agent is Anjeka-6070, and the film-forming additive is alcohol ester hexadecene. The above-mentioned additives adjust the physical and chemical properties of the coating, so that the coating has excellent construction performance and stability.

[0012] Furthermore, the above-mentioned water-based polyurea-based grounding conductive anti-corrosion coating film has a preparation process comprising the following steps: S1, preparing graphene powder coated with gallic acid-doped polypyrrole, dispersing 1 part of monolayer or multilayer graphene in 100 parts of deionized water, adding 1 part of polypyrrole monomer and 1 part of gallic acid, stirring at 0°C for 1 hour, then heating to 25°C and continuing stirring for 3 hours, washing with deionized water, filtering 3 times, and drying in a 120°C oven to constant weight, and crushing to 300-500 mesh using a grinder to obtain the target powder; S2, prepare a slurry by adding 100 parts of aqueous polyurea emulsion into a coating disperser, then adding 0.1-1 parts of graphene with surface-coated gallic acid-doped polypyrrole, 60-105 parts of graphite, 0.5-1.5 parts of wetting and dispersing agent Anjeka-6070 and 5-65 parts of deionized water, and stirring to form a slurry; S3, preparing a coating film, adding 0.2-1 parts of defoaming agent TEGO-902W, 0.3-0.8 parts of leveling agent BYK-381, and 0.5-2 parts of film-forming auxiliary agent alcohol ester hexadecane to the slurry obtained in step S2, and stirring evenly to obtain a coating film; S4, applying the coating film, applying the coating film to a clean and impurity-free galvanized steel or copper-clad steel surface by brushing or spraying, and curing it at room temperature, and controlling the coating film thickness to be 50-120 μm.

[0013] Furthermore, the present invention addresses the risk of galvanic corrosion caused by traditional carbon materials on metal substrates by introducing graphene with a surface coating of gallic acid-doped polypyrrole. The gallic acid-doped polypyrrole layer coated on the graphene surface not only improves the compatibility of the graphene with the aqueous polyurea emulsion but also significantly reduces the potential difference between the carbon material and the metal substrate, thereby inhibiting the occurrence of galvanic corrosion. In addition, the graphite and the graphene with a surface coating of gallic acid-doped polypyrrole synergistically form a continuous conductive network in the coating film, effectively reducing the volume resistivity of the coating film.

[0014] Furthermore, the coating film of the present invention has the following performance indicators: Adhesion (cross-hatch method) ≤ Grade 1; Drying time at 23°C: Surface dry ≤ 4 hours, through dry ≤ 24 hours; Impact strength ≥ 50 kg·cm; Salt spray resistance ≥ 800 hours; Volume resistivity ≥ 20 Ω·cm. These performance indicators demonstrate that the coating film of the present invention possesses excellent mechanical properties, corrosion resistance, and electrical conductivity, capable of meeting the requirements of long-term use in complex soil environments.

[0015] The design concept of the present invention is to use water-based polyurea emulsion as a flexible organic film-forming matrix, and to construct a coating system with both anti-corrosion and conductive functions by adding conductive fillers and additives. The water-based polyurea emulsion acts as an organic framework to play a load-bearing and adhesive role, ensuring good interfacial bonding between the coating and the metal substrate. The conductive filler adjusts the volume resistivity of the coating through synergistic action to form a continuous conductive network, thereby realizing the conductive dispersion function of the coating. The additive further improves the construction performance and service life of the coating by improving the wetting, dispersion and integrity of the coating. In addition, the deionized water is used as a diluent to adjust the viscosity of the coating to facilitate construction operations.

[0016] Advantages and beneficial effects of the present invention: 1. The preparation process of the coating film of the present invention is simple, and the required raw materials can be directly purchased from the market, which is low in cost and is suitable for various metal grounding electrode materials such as galvanized steel and copper-clad steel; 2. The coating film of the present invention is dense and free of holes, the film-forming material and filler are evenly distributed, and it has high impact toughness and mechanical properties; 3. The coating of the present invention can provide excellent corrosion resistance for a long time in complex soil environments, meeting the long-term protection requirements of grounding materials; 4. The volume resistivity of the coating film of the present invention is significantly reduced, which can provide good conductive dispersion effect for the metal grounding electrode; 5. The coating film of the present invention adopts a water-based environmentally friendly system, and no VOCs are released during the manufacturing, transportation, storage and construction links, avoiding pollution to the atmosphere, soil and water bodies.

[0017] 6. The present invention achieves a comprehensive improvement in coating performance by optimizing the coating formula and preparation process. The aqueous polyurea emulsion, as the core film-forming substance, ensures the stability and durability of the coating in complex environments through its high solid content and excellent mechanical properties. The graphene with gallic acid-doped polypyrrole on the surface acts synergistically with graphite, not only reducing the volume resistivity of the coating but also significantly increasing the conductive network density of the coating. The additive further enhances the integrity and uniformity of the coating by improving the wetting, dispersion and leveling properties of the coating. 7. The preparation process of the coating film of the present invention has strong controllability and operability. In step S1, the compatibility of graphene and aqueous polyurea emulsion is ensured by precisely controlling the preparation conditions of the graphene surface coating layer. In step S2, the uniformity and stability of the slurry are ensured by optimizing the addition sequence and ratio of fillers and additives. In step S3, the construction performance and service performance of the coating film are further improved by rationally selecting the type and amount of additives. In step S4, the reliability and consistency of the coating film in actual application are ensured by controlling the coating film thickness and curing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The surface micromorphology of the water-based polyurea-based grounding conductive anti-corrosion coating; Figure 2 This is the cross-sectional micromorphology of the water-based polyurea-based grounding conductive anti-corrosion coating. DETAILED DESCRIPTION

[0019] The present invention provides a water-based polyurea-based grounding conductive anti-corrosion coating and its preparation process, and its specific implementation is described in detail with reference to the accompanying drawings and examples. Figure 1 The surface microstructure of the waterborne polyurea-based grounding conductive anti-corrosion coating is shown. Figure 2 The cross-sectional microscopic morphology of the coating film is shown, and the specific implementation process of the present invention is further explained by combining the accompanying drawings with the actual technical solution. Example 1

[0020] The present embodiment provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of the following components in parts by mass: 100 parts of water-based polyurea emulsion, 1 part of graphene with surface coated gallic acid-doped polypyrrole, 60 parts of graphite, 5 parts of deionized water, 0.2 parts of defoaming agent, 0.3 parts of leveling agent, 0.5 parts of wetting and dispersing agent, and 0.5 parts of film-forming aid.

[0021] The preparation method comprises the following steps: (1) Preparation of graphene powder with surface coating of gallic acid doped polypyrrole: 1 part of single-layer graphene was dispersed in 100 parts of deionized water, followed by adding 1 part of polypyrrole monomer and 1 part of gallic acid, stirring at 0°C for 1 hour, heating to 25°C and stirring for 3 hours, washing with deionized water and filtering 3 times, then drying in a 120°C oven to constant weight, and then crushing it to 500 mesh using a grinder to obtain graphene with surface coating of gallic acid doped polypyrrole.

[0022] (2) Preparation of slurry: add 100 parts of aqueous polyurea emulsion (solid content 50%, tensile strength 25MP, elongation at break 350%) into a paint disperser, then add 1 part of graphene powder with surface coated gallic acid doped polypyrrole, 60 parts of graphite (carbon content ≥99%, powder fineness 2000 mesh), 0.5 parts of wetting dispersant Anjeka-6070, and 5 parts of deionized water and stir to form a slurry.

[0023] (3) Preparation of coating film: add 0.2 parts of defoaming agent TEGO-902W, 0.3 parts of leveling agent BYK-381, and 0.5 parts of film-forming aid alcohol ester hexadecane to the slurry of step (2), and stir evenly to obtain a coating film.

[0024] (4) Coating: Apply the coating by brushing on a clean copper-clad steel surface free of impurities and solidify it at room temperature, controlling the coating thickness to 50 μm.

[0025] (5) The performance indicators of the water-based polyurea-based grounding conductive anti-corrosion coating of this embodiment are as follows: adhesion (cross-hatch method) ≤ Level 1; drying time at 23°C: surface drying ≤ 4 hours, and actual drying ≤ 24 hours; impact strength ≥ 50kg·cm; salt spray resistance time = 870h, volume resistivity = 17Ω·cm. Example 2

[0026] The present embodiment provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of the following components in parts by mass: 100 parts of water-based polyurea emulsion, 0.1 parts of graphene with surface coated with gallic acid-doped polypyrrole, 105 parts of graphite, 65 parts of deionized water, 1 part of defoaming agent, 0.8 parts of leveling agent, 1.5 parts of wetting and dispersing agent, and 2 parts of film-forming aid.

[0027] The preparation method comprises the following steps: (1) Preparation of graphene powder with surface coating of gallic acid doped polypyrrole: 1 part of multilayer graphene was dispersed in 100 parts of deionized water, followed by adding 1 part of polypyrrole monomer and 1 part of gallic acid. The mixture was stirred at 0°C for 1 hour, heated to 25°C and stirred for 3 hours, washed with deionized water and filtered three times, and then dried in a 120°C oven to constant weight. The mixture was then crushed to 300 mesh using a pulverizer to obtain graphene with surface coating of gallic acid doped polypyrrole.

[0028] (2) Preparation of slurry: add 100 parts of aqueous polyurea emulsion (solid content 45%, tensile strength 30MP, elongation at break 450%) into a paint disperser, then add 0.1 parts of graphene powder with surface coated gallic acid doped polypyrrole, 105 parts of graphite (carbon content ≥99%, powder fineness 500 mesh), 1.5 parts of wetting dispersant Anjeka-6070, and 65 parts of deionized water and stir to form a slurry.

[0029] (3) Preparation of coating film: add 1 part of defoamer TEGO-902W, 0.8 part of leveling agent BYK-381, and 2 parts of film-forming aid, alcohol ester hexadecene, to the slurry of step (2), and stir evenly to obtain a coating film.

[0030] (4) Coating: Spray the coating onto a clean, impurity-free galvanized steel surface and solidify it at room temperature, controlling the coating thickness to 120 μm.

[0031] (5) The performance indicators of the water-based polyurea-based grounding conductive anti-corrosion coating of this embodiment are as follows: adhesion (cross-hatch method) ≤ Level 1; drying time at 23°C: surface drying ≤ 4 hours, and actual drying ≤ 24 hours; impact strength ≥ 50kg·cm; salt spray resistance time = 800h, volume resistivity = 19Ω·cm. Example 3

[0032] The present embodiment provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of the following components in parts by mass: 100 parts of water-based polyurea emulsion, 0.9 parts of graphene with surface coated gallic acid-doped polypyrrole, 100 parts of graphite, 58 parts of deionized water, 1 part of defoaming agent, 0.8 parts of leveling agent, 1.5 parts of wetting and dispersing agent, and 1.5 parts of film-forming aid.

[0033] The preparation method comprises the following steps: (1) Preparation of graphene powder with surface coating of gallic acid doped polypyrrole: 1 part of multilayer graphene was dispersed in 100 parts of deionized water, followed by adding 1 part of polypyrrole monomer and 1 part of gallic acid. The mixture was stirred at 0°C for 1 hour, heated to 25°C and stirred for 3 hours, washed with deionized water and filtered 3 times, and then dried in a 120°C oven to constant weight. The mixture was then crushed to 400 mesh using a pulverizer to obtain graphene with surface coating of gallic acid doped polypyrrole.

[0034] (2) Preparation of slurry: add 100 parts of aqueous polyurea emulsion (solid content 60%, tensile strength 25MP, elongation at break 300%) into a paint disperser, then add 0.9 parts of graphene powder with surface coated gallic acid doped polypyrrole, 100 parts of graphite (carbon content ≥99%, powder fineness 800 mesh), 1.5 parts of wetting dispersant Anjeka-6070, and 58 parts of deionized water and stir to form a slurry.

[0035] (3) Preparation of coating film: add 1 part of defoaming agent TEGO-902W, 0.8 part of leveling agent BYK-381, and 1.5 parts of film-forming aid alcohol ester hexadecane to the slurry of step (2), and stir evenly to obtain a coating film.

[0036] (4) Coating: Apply the coating by brushing on a clean, impurity-free galvanized steel surface and solidify it at room temperature, controlling the coating thickness to 80 μm.

[0037] (5) The performance indicators of the water-based polyurea-based grounding conductive anti-corrosion coating of this embodiment are as follows: adhesion (cross-hatch method) ≤ Level 1; drying time at 23°C: surface drying ≤ 4 hours, and actual drying ≤ 24 hours; impact strength ≥ 50 kg·cm; salt spray resistance time = 810 h, volume resistivity = 15 Ω·cm. Example 4

[0038] The present embodiment provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of the following components in parts by mass: 100 parts of water-based polyurea emulsion, 0.7 parts of graphene with surface coated with gallic acid-doped polypyrrole, 85 parts of graphite, 60 parts of deionized water, 0.8 parts of defoaming agent, 0.7 parts of leveling agent, 1.3 parts of wetting and dispersing agent, and 1.3 parts of film-forming aid.

[0039] The preparation method comprises the following steps: (1) Preparation of graphene powder with surface coating of gallic acid doped polypyrrole: 1 part of single-layer graphene was dispersed in 100 parts of deionized water, followed by adding 1 part of polypyrrole monomer and 1 part of gallic acid. The mixture was stirred at 0°C for 1 hour, heated to 25°C and stirred for 3 hours, washed with deionized water and filtered three times, and then dried in a 120°C oven to constant weight. The mixture was then crushed to 450 mesh using a pulverizer to obtain graphene with surface coating of gallic acid doped polypyrrole.

[0040] (2) Preparation of slurry: add 100 parts of aqueous polyurea emulsion (solid content 50%, tensile strength 25MP, elongation at break 500%) into a paint disperser, then add 0.7 parts of graphene powder with surface coated gallic acid doped polypyrrole, 85 parts of graphite (carbon content ≥99%, powder fineness 1200 mesh), 1.3 parts of wetting dispersant Anjeka-6070, and 60 parts of deionized water and stir to form a slurry.

[0041] (3) Preparation of coating film: add 0.8 parts of defoaming agent TEGO-902W, 0.7 parts of leveling agent BYK-381, and 1.3 parts of film-forming aid alcohol ester hexadecane to the slurry of step (2), and stir evenly to obtain a coating film.

[0042] (4) Coating: Apply the coating by brushing on a clean, impurity-free galvanized steel surface and solidify it at room temperature, controlling the coating thickness to 70 μm.

[0043] (5) The performance indicators of the water-based polyurea-based grounding conductive anti-corrosion coating of this embodiment are as follows: adhesion (cross-hatch method) ≤ Level 1; drying time at 23°C: surface drying ≤ 4 hours, actual drying ≤ 24 hours; impact strength ≥ 50kg·cm; salt spray resistance time = 800h, volume resistivity = 18Ω·cm. Example 5

[0044] The present embodiment provides a water-based polyurea-based grounding conductive anti-corrosion coating, which is composed of the following components in parts by mass: 100 parts of water-based polyurea emulsion, 0.8 parts of graphene with surface coated with gallic acid-doped polypyrrole, 100 parts of graphite, 60 parts of deionized water, 1 part of defoaming agent, 0.5 parts of leveling agent, 1.2 parts of wetting and dispersing agent, and 2 parts of film-forming aid.

[0045] The preparation method comprises the following steps: (1) Preparation of graphene powder with surface coating of gallic acid doped polypyrrole: 1 or more monolayer graphene was dispersed in 100 parts of deionized water, followed by the addition of 1 part of polypyrrole monomer and 1 part of gallic acid, stirred at 0°C for 1 hour, heated to 25°C and stirred for 3 hours, washed with deionized water and filtered three times, then dried in a 120°C oven to constant weight, and then crushed to 450 mesh using a grinder to obtain graphene with surface coating of gallic acid doped polypyrrole.

[0046] (2) Preparation of slurry: add 100 parts of aqueous polyurea emulsion (solid content 48%, tensile strength 28MP, elongation at break 570%) into a paint disperser, then add 0.8 parts of graphene powder with surface coated gallic acid doped polypyrrole, 100 parts of graphite (carbon content ≥99%, powder fineness 1000 mesh), 1.2 parts of wetting dispersant Anjeka-6070, and 65 parts of deionized water and stir to form a slurry.

[0047] (3) Preparation of coating film: add 1 part of defoamer TEGO-902W, 0.5 part of leveling agent BYK-381, and 2 parts of film-forming aid, alcohol ester hexadecane, to the slurry of step (2), and stir evenly to obtain a coating film.

[0048] (4) Coating: Apply the coating by brushing on a clean, impurity-free galvanized steel surface and solidify it at room temperature, controlling the coating thickness to 100 μm.

[0049] (5) The performance indicators of the water-based polyurea-based grounding conductive anti-corrosion coating of this embodiment are as follows: adhesion (cross-hatch method) ≤ Level 1; drying time at 23°C: surface drying ≤ 4 hours, actual drying ≤ 24 hours; impact strength ≥ 50kg·cm; salt spray resistance time = 900h, volume resistivity = 19Ω·cm.

[0050] The above examples demonstrate the significant technical advantages of the coating of the present invention in practical applications. The coating's low volume resistivity and high salt spray resistance provide excellent electrical conductivity, current dispersion, and corrosion resistance in complex soil environments. The coating's dense structure and high adhesion effectively prevent the penetration of soil corrosive media, extending the service life of grounding materials. The coating's water-based, environmentally friendly properties prevent secondary pollution during manufacturing and construction, meeting modern industry's requirements for green manufacturing.

[0051] In summary, the present invention successfully developed a water-based polyurea-based conductive anticorrosive grounding coating with both anticorrosion and electrical conductivity through a specific composition design and preparation process. This coating not only addresses the corrosion resistance and electrical conductivity issues of traditional grounding materials in complex soil environments, but also achieves environmentally friendly protection through an environmentally friendly formulation design, thus possessing significant industrial application value and technological promotion prospects.

Claims

1. A water-based polyurea-based grounding conductive anti-corrosion coating, characterized in that: The invention is composed of the following components in parts by mass: 100 parts of aqueous polyurea emulsion, 0.1-1 parts of graphene with surface coated with gallic acid doped with polypyrrole, 60-105 parts of graphite, 5-65 parts of deionized water, 0.2-1 parts of defoaming agent, 0.3-0.8 parts of leveling agent, 0.5-1.5 parts of wetting and dispersing agent, and 0.5-2 parts of film-forming aid.

2. The waterborne polyurea-based grounding conductive anti-corrosion coating according to claim 1, characterized in that: The water-based polyurea emulsion has a solid content of 45%-60%, a tensile strength of 25-30 MPa, and an elongation at break greater than 300%.

3. The water-based polyurea-based grounding conductive anti-corrosion coating according to claim 2, characterized in that: The fineness of the graphene powder with surface coated gallic acid doped with polypyrrole is 300-500 meshes.

4. The waterborne polyurea-based grounding conductive anti-corrosion coating according to claim 1, characterized in that: The carbon content of the graphite is not less than 99%, and the powder fineness is 500-2000 mesh.

5. The waterborne polyurea-based ground conductive anti-corrosion coating according to claim 1, characterized in that: The electrical conductivity of the deionized water is no greater than 0.1 ms / m.

6. The waterborne polyurea-based ground conductive anti-corrosion coating according to claim 1, characterized in that: The defoaming agent is TEGO-902W, the leveling agent is BYK-381, the wetting and dispersing agent is Anjeka-6070, and the film-forming aid is alcohol ester hexadecane.

7. The waterborne polyurea-based ground conductive anti-corrosion coating according to claim 1, characterized in that: The preparation process of the coating film comprises the following steps: preparing graphene powder with gallic acid-doped polypyrrole coated on the surface; preparing slurry; preparing the coating film; applying the coating film and curing it.

8. The waterborne polyurea-based ground conductive anti-corrosion coating according to claim 7, characterized in that: The coating film has a thickness of 50-120 μm, and the curing condition is room temperature.

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