Water-based non-carbon static conductive anticorrosive coating and preparation method thereof

Abstract

The invention provides a water-based non-carbon static conductive anticorrosive coating and a preparation method thereof. The method is simple and convenient, the prepared anticorrosive paint has excellent salt mist resistance and chemical medium resistance, 5% H2SO4 resistance can reach 60 days or above, and the adopted bisphenol A / F copolymerization type water-borne epoxy resin improves the polarity and the water-borne degree of a system and ensures that the paint has the optimal anticorrosive performance; the water-based polyaniline is matched with the conductive mica powder to serve as a non-carbon conductive filler of the system, so that the environment-friendly requirement is met, and the conductivity and the corrosion resistance of the coating are guaranteed; a silane coupling agent containing reactive epoxypropoxy and methoxyl is adopted, so that the adhesive force of a paint film is improved, and the service life is prolonged; the water-based non-carbon static conductive anticorrosive paint can be used for anticorrosive engineering of steel structures such as oil storage tanks, equipment pipelines, ocean platforms and the like.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, and more specifically, to a water-based non-carbon conductive anti-corrosion coating and its preparation method. Background Technology

[0002] Oil storage tanks, as crucial equipment in oil and gas fields and refining enterprises, play a vital role in ensuring production stability and improving energy efficiency. However, oil storage tanks are susceptible to static electricity hazards and complex corrosive media, leading to corrosion of the tank's inner wall or static-induced fires, potentially causing fires or explosions. This impacts the production safety of oil and petrochemical enterprises, creating significant economic and environmental pressures. Conductive coatings can ensure the safe construction of oil storage tanks through corrosion protection and the elimination of static charge accumulation, thereby preventing catastrophic accidents.

[0003] Conventional conductive coatings are mainly solvent-based and solvent-free. Solvent-based conductive coatings pose environmental pollution, harm to workers' health, and safety hazards due to high concentrations of volatile organic compounds during enclosed construction. Solvent-free conductive coatings, due to their high solids content and viscosity, are difficult to apply by roller or brush, reducing coating efficiency. Therefore, the demand for safe, environmentally friendly, and highly efficient conductive coatings is becoming increasingly strong.

[0004] Driven by national safety and environmental protection policies, the water-based coating industry is developing rapidly. GB / T 50393-2017, "Technical Standard for Corrosion Protection Engineering of Steel Petroleum Storage Tanks," specifically mentions and specifies the performance requirements for water-based heavy-duty anti-corrosion coatings. Water-based conductive coatings can replace traditional solvent-based conductive coatings, meeting safety and environmental protection requirements and solving the technical problems of high viscosity and difficult roller / brush application of solvent-free conductive coatings. However, traditional water-based carbon-based conductive coatings suffer from corrosion problems due to potential differences, making it difficult to meet the performance indicators of hot water resistance and chemical media resistance specified in GB / T 50393-2017. Therefore, the development of a water-based non-carbon-based conductive anti-corrosion coating with excellent anti-corrosion performance, stable conductive properties, and good application adaptability has extremely high market promotion value for ensuring safe construction in enclosed spaces, improving coating efficiency, and ensuring the stable operation of petroleum storage tanks. Summary of the Invention

[0005] In view of this, the present invention provides an aqueous non-carbon-based conductive anti-corrosion coating, comprising the following components in parts by weight: Component A comprises: 50-55 parts by weight of waterborne epoxy resin; and 8-10 parts by weight of deionized water. Dispersant, 1-1.5 parts by weight; defoamer, 0.4-0.6 parts by weight; titanium dioxide, 3-5 parts by weight; aluminum tripolyphosphate, 4-6 parts by weight; polyaniline, 10-15 parts by weight; conductive mica powder, 15-20 parts by weight; film-forming aid, 2-3 parts by weight; wetting agent, 0.25-0.4 parts by weight; thickener, 0.3-0.5 parts by weight; silane coupling agent, 0.6-1.0 parts by weight. Component B comprises: epoxy curing agent, 62-65 parts by weight; deionized water, 30-35 parts by weight; and flash rust inhibitor, 0.1-0.2 parts by weight. The weight ratio of component A to component B is 7:1.

[0006] Preferably, component A comprises: 52 parts by weight of waterborne epoxy resin; 8 parts by weight of deionized water; 1 part by weight of dispersant; 0.4 parts by weight of defoamer; 4 parts by weight of titanium dioxide; 4 parts by weight of aluminum tripolyphosphate; 12 parts by weight of polyaniline; 15 parts by weight of conductive mica powder; 2 parts by weight of film-forming aid; 0.4 parts by weight of wetting agent; 0.5 parts by weight of thickener; and 0.8 parts by weight of silane coupling agent. Component B comprises: 62 parts by weight of epoxy curing agent; 30 parts by weight of deionized water; and 0.2 parts by weight of flash rust inhibitor.

[0007] Furthermore, the waterborne epoxy resin is a bisphenol A / F copolymer waterborne epoxy resin.

[0008] Furthermore, the dispersant is a block copolymer solution containing pigment affinity groups.

[0009] Furthermore, the defoamer is a polysiloxane solution containing hydrophobic particles.

[0010] Furthermore, the titanium dioxide is 800-mesh anatase titanium dioxide.

[0011] Furthermore, the aluminum tripolyphosphate is an aminosilane-modified aluminum tripolyphosphate.

[0012] Furthermore, the polyaniline is an aqueous polyaniline solution.

[0013] Furthermore, the resistivity of the conductive mica powder is less than 150 Ω·cm.

[0014] Furthermore, the film-forming aid is one or more of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

[0015] Furthermore, the thickener is one or more of nonionic low-shear polyurethane thickeners and nonionic medium-shear polyurethane thickeners.

[0016] Furthermore, the wetting agent is a gemini-type organic modified polysiloxane compound.

[0017] Furthermore, the silane coupling agent contains reactive epoxypropoxy and methoxy groups.

[0018] Furthermore, the epoxy curing agent is a self-emulsifying nonionic modified amine epoxy curing agent.

[0019] Furthermore, the anti-flash rust agent is an organozinc chelate.

[0020] This invention provides a water-based non-carbon conductive anti-corrosion coating with the following advantages: The coating exhibits excellent resistance to salt spray and chemical media, withstanding 5% H2SO4 for over 60 days. The use of bisphenol A / F copolymer water-based epoxy resin enhances the system's polarity and water-based nature, ensuring optimal anti-corrosion performance. The use of water-based polyaniline combined with conductive mica powder as a non-carbon conductive filler satisfies environmental requirements while ensuring the coating's conductivity and anti-corrosion properties. The use of a silane coupling agent containing reactive epoxy propoxy and methoxy groups improves film adhesion and extends service life. This water-based non-carbon conductive anti-corrosion coating can be used for anti-corrosion projects of steel structures such as oil storage tanks, equipment pipelines, and offshore platforms.

[0021] Another aspect of the present invention provides a method for preparing a water-based non-carbon-based conductive anti-corrosion coating, comprising: The preparation of water-based non-carbon conductive electrostatic slurry involves first preparing deionized water, then adding dispersant and defoamer sequentially for dispersion, followed by adding titanium dioxide, aluminum tripolyphosphate, polyaniline, and conductive mica powder for further dispersion, and finally grinding to obtain the water-based non-carbon conductive electrostatic slurry. To prepare component A, a predetermined amount of waterborne epoxy resin was added to the electrostatic slurry, followed by the sequential addition of film-forming aid, wetting agent, and silane coupling agent for dispersion. Finally, a thickener was added for further dispersion to obtain component A of the waterborne non-carbon conductive anti-corrosion coating. Component B is prepared by preparing a predetermined amount of modified amine epoxy curing agent, and then adding deionized water and anti-flash rust agent to disperse them, thus obtaining component B of the water-based non-carbon conductive anti-corrosion coating. The water-based non-carbon conductive anti-corrosion coating is prepared by mixing the prepared component A and component B in a predetermined weight ratio to obtain the water-based non-carbon conductive anti-corrosion coating.

[0022] Furthermore, in the preparation of the water-based non-carbon-based conductive electrostatic slurry, deionized water is first added to the feed tank. While stirring, dispersant and defoamer are added in sequence, with the rotation speed controlled at 400-500 r / min and the dispersion time at 5-10 min. After adding titanium dioxide, aluminum tripolyphosphate, polyaniline, and conductive mica powder, the stirring is continued, with the rotation speed controlled at 700-900 r / min and the dispersion time at 20-30 min. When the above mixed solution is transferred to a sand mill for grinding, the grinding fineness is controlled to be less than 20 micrometers.

[0023] Furthermore, in the preparation of component A, when adding the prescribed amount of waterborne epoxy resin to the mixing tank, the stirring speed is controlled at 400-500 r / min; when slowly adding the film-forming aid, wetting agent, and silane coupling agent in sequence, the stirring speed remains unchanged, and the dispersion time is controlled at 20-30 minutes; when slowly adding the prescribed amount of thickener and continuing to stir, the stirring speed needs to be increased to 1000-1100 r / min, and the dispersion time is controlled at 30-40 minutes.

[0024] Furthermore, in the preparation of component B, the modified amine epoxy curing agent is added to the mixing tank and stirred. The stirring speed is controlled at 500-600 r / min. Deionized water and anti-flash rust agent are added during the stirring process, and then stirring is continued for 15-25 min.

[0025] Furthermore, in the preparation of the water-based non-carbon conductive anti-corrosion coating, component A and component B are mixed evenly according to a weight ratio of 7:1.

[0026] This invention provides a method for preparing a water-based non-carbon-based conductive anti-corrosion coating, which can solve the environmental pollution caused by high VOC emissions of traditional solvent-based conductive coatings, the low coating efficiency caused by high viscosity of solvent-free conductive coatings, and the corrosion problems caused by the potential difference of carbon-based conductive fillers in conventional water-based conductive coatings. It not only ensures that the paint film has excellent resistance to hot water, chemical media and stable conductive properties, but also facilitates roller coating and brush coating, improves construction adaptability and coating efficiency, and ensures long-term corrosion protection for oil storage tanks. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 The diagram illustrates the steps of a method for preparing a water-based non-carbon conductive anti-corrosion coating according to an embodiment of the present invention. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] One embodiment of the present invention discloses a water-based non-carbon-based conductive anti-corrosion coating, comprising the following components in parts by weight: Component A comprises: waterborne epoxy resin, 50-55 parts by weight; deionized water, 8-10 parts by weight; dispersant, 1-1.5 parts by weight; defoamer, 0.4-0.6 parts by weight; titanium dioxide, 3-5 parts by weight; aluminum tripolyphosphate, 4-6 parts by weight; polyaniline, 10-15 parts by weight; conductive mica powder, 15-20 parts by weight; film-forming aid, 2-3 parts by weight; wetting agent, 0.25-0.4 parts by weight; thickener, 0.3-0.5 parts by weight; and silane coupling agent, 0.6-1.0 parts by weight. Component B comprises: epoxy curing agent, 62-65 parts by weight; deionized water, 30-35 parts by weight; and flash rust inhibitor, 0.1-0.2 parts by weight. The weight ratio of component A to component B is 7:1.

[0030] In a more preferred embodiment of the present invention, component A comprises: 52 parts by weight of aqueous epoxy resin; 8 parts by weight of deionized water; 1 part by weight of dispersant; 0.4 parts by weight of defoamer; 4 parts by weight of titanium dioxide; 4 parts by weight of aluminum tripolyphosphate; 12 parts by weight of polyaniline; 15 parts by weight of conductive mica powder; 2 parts by weight of film-forming aid; 0.4 parts by weight of wetting agent; 0.5 parts by weight of thickener; and 0.8 parts by weight of silane coupling agent. Component B comprises: 62 parts by weight of epoxy curing agent; 30 parts by weight of deionized water; and 0.2 parts by weight of flash rust inhibitor.

[0031] In this embodiment, the waterborne epoxy resin is a bisphenol A / F copolymer waterborne epoxy resin. Using a bisphenol A / F copolymer waterborne epoxy resin as the film-forming material of the system, the resin's molecular chain incorporates bisphenol A with good skeletal toughness and bisphenol F with low viscosity. The combination of these two ensures the resin's resistance to chemical media and mechanical properties, and also improves the system's polarity and waterborne nature, ensuring the coating has optimal anti-corrosion performance.

[0032] In this embodiment, the dispersant is a block copolymer solution containing pigment affinity groups.

[0033] In this embodiment, the defoamer is a polysiloxane solution containing hydrophobic particles.

[0034] In this embodiment, the titanium dioxide is 800-mesh anatase titanium dioxide.

[0035] In this embodiment, the aluminum tripolyphosphate is aminosilane-modified aluminum tripolyphosphate.

[0036] In this embodiment, the polyaniline is an aqueous polyaniline solution.

[0037] In this embodiment, the resistivity of the conductive mica powder is less than 150 Ω·cm. Specifically, water-based polyaniline combined with conductive mica powder is used as a non-carbon-based conductive filler in the system. Water-based polyaniline, using water as a solvent, contains no organic solvents, reducing VOC emissions and meeting environmental protection requirements. It also effectively reduces the surface resistivity of the coating, thus reducing the amount of conductive mica powder used. The conductive mica powder has excellent conductivity, and its layered structure can physically shield corrosive ions, improving the coating's impermeability. The combination of these two components significantly improves the conductivity, acid and alkali resistance, and salt spray resistance of the coating after film formation.

[0038] In this embodiment, the film-forming aid is one or more of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

[0039] In this embodiment, the thickener is one or more of nonionic low-shear polyurethane thickeners and nonionic medium-shear polyurethane thickeners.

[0040] In this embodiment, the wetting agent is a gemini-type organic modified polysiloxane compound.

[0041] In this embodiment, the silane coupling agent contains reactive epoxy propoxy and methoxy groups, which can solve the problem of hydrolysis of conventional silane coupling agents in water-based coatings. The stable number of silicon-oxygen bonds improves the adhesion between the coating and the substrate by reacting with hydroxyl groups on the surface of the metal substrate. It can also form covalent bonds with the metal surface, effectively preventing the penetration of corrosive media, thereby improving the corrosion resistance of the paint film and extending its service life.

[0042] In this embodiment, the epoxy curing agent is a self-emulsifying nonionic modified amine epoxy curing agent.

[0043] In this embodiment, the anti-flash rust agent is an organozinc chelate.

[0044] The preparation method of the above-mentioned water-based non-carbon conductive anti-corrosion coating includes the following steps: (1) Preparation of water-based non-carbon conductive water slurry: Weigh each component strictly according to the formula weight parts. First, add deionized water to the material tank, then add dispersant and defoamer in sequence. Control the speed at 400-500 r / min and disperse for 5-10 min. Then add titanium dioxide, aluminum tripolyphosphate, polyaniline and conductive mica powder, and control the speed at 700-900 r / min and disperse for 20-30 min. Transfer the above mixed solution to a sand mill for grinding, and control the grinding fineness to be less than 20 microns to obtain water-based non-carbon conductive water slurry.

[0045] (2) Preparation of component A of waterborne non-carbon conductive anti-corrosion coating: Add the prescribed amount of waterborne epoxy resin to the material tank, control the rotation speed at 400-500 r / min, and slowly add the film-forming aid, wetting agent and silane coupling agent in sequence, keep the rotation speed unchanged and disperse for 20-30 minutes, and finally slowly add the prescribed amount of thickener, gradually increase the rotation speed to 1000-1100 r / min and disperse for 30-40 minutes to obtain component A of waterborne non-carbon conductive anti-corrosion coating.

[0046] (3) Preparation of component B of waterborne non-carbon conductive anti-corrosion coating: Weigh each raw material according to the formula amount, add the modified amine epoxy curing agent into the material cylinder, control the rotation speed to 500-600 r / min, then add deionized water and anti-flash rust agent respectively, control the dispersion time to 15-25 min, and obtain component B of waterborne non-carbon conductive anti-corrosion coating.

[0047] (4) Mix the components A and B in a weight ratio of 7:1 to obtain the water-based non-carbon conductive anti-corrosion coating.

[0048] The water-based non-carbon conductive anti-corrosion coating disclosed in the above embodiments will be described in detail with reference to specific embodiments.

[0049] Example 1 formula: Each 10g part by weight contains the following raw materials in parts by weight: 50 parts by weight of waterborne epoxy resin, 8 parts by weight of deionized water, 1.5 parts by weight of dispersant, 0.4 parts by weight of defoamer, 4 parts by weight of titanium dioxide, 4 parts by weight of aluminum tripolyphosphate, 10 parts by weight of polyaniline, 18 parts by weight of conductive mica powder, 2 parts by weight of film-forming aid, 0.25 parts by weight of wetting agent, 0.3 parts by weight of thickener, and 0.8 parts by weight of silane coupling agent; Component B contains the following raw materials in parts by weight: 62 parts by weight of epoxy curing agent, 35 parts by weight of deionized water, and 0.1 parts by weight of flash rust inhibitor.

[0050] Preparation process: Weigh each component strictly according to the formula weight ratio. First, add deionized water to the material tank, then add dispersant and defoamer in sequence, and disperse at 400 r / min for 8 min. Then add titanium dioxide, aluminum tripolyphosphate, polyaniline, and conductive mica powder, and disperse at 800 r / min for 20 min. Transfer the above mixed solution to a sand mill for grinding, and control the grinding fineness to be less than 20 microns to obtain an aqueous non-carbon-based conductive electrostatic slurry.

[0051] Add the formulated amount of waterborne epoxy resin to the material tank, control the rotation speed at 400 r / min, and slowly add the film-forming aid, wetting agent, and silane coupling agent in sequence. Keep the rotation speed constant and disperse for 25 minutes. Finally, slowly add the formulated amount of thickener, gradually increase the rotation speed to 1000 r / min and disperse for 30 minutes to obtain component A of the waterborne non-carbon conductive anti-corrosion coating.

[0052] Weigh each raw material according to the formula, add the modified amine epoxy curing agent to the material cylinder, control the rotation speed at 500 r / min, then add deionized water and anti-flash rust agent respectively, control the dispersion time at 20 min, and obtain component B of the water-based non-carbon conductive anti-corrosion coating.

[0053] The components A and B are mixed evenly in a weight ratio of 7:1 to obtain the water-based non-carbon conductive anti-corrosion coating.

[0054] The comprehensive performance of the water-based non-carbon conductive anti-corrosion coating obtained in this embodiment was tested, and all the properties of the coating and its film are shown in Table 1.

[0055] Example 2 formula: Each 10g part by weight contains the following raw materials in parts by weight: 55 parts by weight of waterborne epoxy resin, 10 parts by weight of deionized water, 1.2 parts by weight of dispersant, 0.5 parts by weight of defoamer, 5 parts by weight of titanium dioxide, 5 parts by weight of aluminum tripolyphosphate, 12 parts by weight of polyaniline, 17 parts by weight of conductive mica powder, 3 parts by weight of film-forming aid, 0.4 parts by weight of wetting agent, 0.5 parts by weight of thickener, and 0.9 parts by weight of silane coupling agent; Component B contains the following raw materials in parts by weight: 65 parts by weight of epoxy curing agent, 35 parts by weight of deionized water, and 0.2 parts by weight of flash rust inhibitor.

[0056] Preparation process: Weigh each component strictly according to the formula weight ratio. First, add deionized water to the material tank, then add dispersant and defoamer in sequence, and disperse at 500 r / min for 10 min. Then add titanium dioxide, aluminum tripolyphosphate, polyaniline, and conductive mica powder, and disperse at 900 r / min for 30 min. Transfer the above mixed solution to a sand mill for grinding, and control the grinding fineness to be less than 20 microns to obtain an aqueous non-carbon-based conductive electrostatic slurry.

[0057] Add the prescribed amount of waterborne epoxy resin to the material tank, control the rotation speed at 500 r / min, and slowly add the film-forming aid, wetting agent, and silane coupling agent in sequence. Keep the rotation speed constant and disperse for 30 minutes. Finally, slowly add the prescribed amount of thickener, gradually increase the rotation speed to 1100 r / min and disperse for 40 minutes to obtain component A of the waterborne non-carbon conductive anti-corrosion coating.

[0058] Weigh each raw material according to the formula, add the modified amine epoxy curing agent to the material cylinder, control the rotation speed at 600 r / min, then add deionized water and anti-flash rust agent respectively, control the dispersion time at 25 min, and obtain component B of the water-based non-carbon conductive anti-corrosion coating.

[0059] The components A and B are mixed evenly in a weight ratio of 7:1 to obtain the water-based non-carbon conductive anti-corrosion coating.

[0060] The comprehensive performance of the water-based non-carbon conductive anti-corrosion coating obtained in this embodiment was tested, and all the properties of the coating and its film are shown in Table 2.

[0061] Comparative Example 1 The comprehensive performance of conventional water-based conductive coatings was tested, and the properties of the coatings and their films are shown in Table 3. From Examples 1-2 and Comparative Example 1 above, it can be seen that the water-based non-carbon-based conductive anti-corrosion coating disclosed in the embodiments of the present invention exhibits better application performance in many aspects. Compared with conventional water-based conductive coatings, the coating of the present invention exhibits superior performance in terms of thermal stability and adhesion, with significantly enhanced adhesion; outstanding heat resistance in hot water, and significantly enhanced resistance to gasoline and salt spray; and excellent resistance to chemical media, including resistance to 5% H2SO4 for up to 1500h, and resistance to 10% H2SO4, 10% NaOH, and 10% NaCl for 720h, with performance comparable to oil-based conductive coatings. The water-based non-carbon conductive anti-corrosion coating disclosed in this invention exhibits excellent resistance to chemical media and mechanical properties, while also improving the polarity and water-based nature of the system, ensuring optimal anti-corrosion performance. This water-based non-carbon conductive anti-corrosion coating reduces VOC emissions, meeting environmental protection requirements, and effectively lowers the surface resistivity of the coating, reducing the amount of conductive mica powder required. Conductive mica powder possesses excellent conductivity, and its layered structure can physically shield corrosive ions, improving the coating's impermeability. The combination of these two components significantly enhances the conductivity, acid and alkali resistance, and salt spray resistance of the coating after film formation. This water-based non-carbon conductive anti-corrosion coating solves the hydrolysis problem of conventional silane coupling agents in water-based coatings. A stable number of silicon-oxygen bonds react with hydroxyl groups on the metal substrate surface to improve the adhesion between the coating and the substrate. It can also form covalent bonds with the metal surface, effectively preventing the penetration of corrosive media, thereby improving the corrosion resistance of the paint film and extending its service life. This water-based non-carbon conductive anti-corrosion coating withstands 1500°C of neutral salt spray. The coating is rust-free, bubble-free, crack-free, and delaminated. It is resistant to 10% H2SO4 for 720 hours, 10% NaOH for 720 hours, 10% NaCl for 720 hours, and gasoline for 1000 hours. Its corrosion resistance is significantly improved compared to conventional water-based conductive coatings.

[0062] In summary, the water-based non-carbon conductive anti-corrosion coating disclosed in this invention has the following beneficial technical effects: This invention uses bisphenol A / F copolymer water-based epoxy resin as the film-forming material of the system. The resin's molecular chain incorporates bisphenol A with good skeleton toughness and bisphenol F with low viscosity. The combination of these two ensures the resin's resistance to chemical media and mechanical properties, and improves the system's polarity and water-based nature, ensuring the coating has optimal anti-corrosion performance. Water-based polyaniline combined with conductive mica powder is used as the non-carbon conductive filler in the system. Water-based polyaniline, using water as a solvent, does not contain organic solvents, reducing VOC emissions and meeting environmental protection requirements. It also effectively reduces the surface resistivity of the coating, reducing the amount of conductive mica powder required. Conductive mica powder has good conductivity, and its layered structure can physically shield corrosive ions to improve the coating's impermeability. The combination of these two components significantly improves the conductivity, acid and alkali resistance, and salt spray resistance of the coating film after formation. The introduction of a silane coupling agent containing reactive epoxy-propylene and methoxy groups solves the hydrolysis problem of conventional silane coupling agents in water-based coatings. A stable number of silicon-oxygen bonds enhance the adhesion between the coating and the substrate by reacting with hydroxyl groups on the metal substrate surface. It can also form covalent bonds with the metal surface, effectively preventing the penetration of corrosive media, thereby improving the corrosion resistance of the paint film and extending its service life. The water-based non-carbon-based conductive anti-corrosion coating of this invention exhibits the following properties: resistance to neutral salt spray for 1500 hours without rusting, blistering, cracking, or delamination; resistance to 10% H₂SO₄ for 720 hours without rusting, blistering, cracking, or delamination; resistance to 10% NaOH for 720 hours without rusting, blistering, cracking, or delamination; and resistance to 10% NaCl for 720 hours. The coating is rust-free, bubble-free, crack-free, and delaminated. It is resistant to gasoline for 1000 hours. The water-based non-carbon conductive anti-corrosion coating of this invention can be used for anti-corrosion projects of steel structures such as oil storage tanks, equipment pipelines, and offshore platforms, and has a wide range of applications.

[0063] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0064] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A water-based non-carbon-based conductive anti-corrosion coating, characterized in that, The components include the following parts by weight: Component A comprises: 50-55 parts by weight of waterborne epoxy resin; and 8-10 parts by weight of deionized water. Dispersant, 1-1.5 parts by weight; defoamer, 0.4-0.6 parts by weight; titanium dioxide, 3-5 parts by weight; aluminum tripolyphosphate, 4-6 parts by weight; polyaniline, 10-15 parts by weight; conductive mica powder, 15-20 parts by weight; film-forming aid, 2-3 parts by weight; wetting agent, 0.25-0.4 parts by weight; thickener, 0.3-0.5 parts by weight; silane coupling agent, 0.6-1.0 parts by weight. Component B comprises: epoxy curing agent, 62-65 parts by weight; deionized water, 30-35 parts by weight; Anti-flash rust agent: 0.1-0.2 parts by weight; The weight ratio of component A to component B is 7:

1.

2. The water-based non-carbon conductive anti-corrosion coating according to claim 1, characterized in that, Component A includes: waterborne epoxy resin, 52 parts by weight; deionized water, 8 parts by weight; dispersant, 1 part by weight; defoamer, 0.4 parts by weight; titanium dioxide, 4 parts by weight; aluminum tripolyphosphate, 4 parts by weight; polyaniline, 12 parts by weight; conductive mica powder, 15 parts by weight; film-forming aid, 2 parts by weight; wetting agent, 0.4 parts by weight; thickener, 0.5 parts by weight; silane coupling agent, 0.8 parts by weight. Component B includes: epoxy curing agent, 62 parts by weight; deionized water, 30 parts by weight; flash rust inhibitor, 0.2 parts by weight.

3. The water-based non-carbon-based conductive anti-corrosion coating according to claim 1, characterized in that, The waterborne epoxy resin is a bisphenol A / F copolymer waterborne epoxy resin; the dispersant is a block copolymer solution containing pigment affinity groups.

4. The water-based non-carbon-based conductive anti-corrosion coating according to claim 1, characterized in that, The defoamer is a polysiloxane solution containing hydrophobic particles; the titanium dioxide is 800-mesh anatase titanium dioxide.

5. The water-based non-carbon conductive anti-corrosion coating according to claim 1, characterized in that, The aluminum tripolyphosphate is an aminosilane-modified aluminum tripolyphosphate; the polyaniline is an aqueous polyaniline solution.

6. The water-based non-carbon-based conductive anti-corrosion coating according to claim 1, characterized in that, The resistivity of the conductive mica powder is less than 150 Ω·cm.

7. The water-based non-carbon conductive anti-corrosion coating according to claim 1, characterized in that, The film-forming aid is one or more of dipropylene glycol methyl ether and dipropylene glycol butyl ether; the thickener is one or more of nonionic low-shear polyurethane thickener and nonionic medium-shear polyurethane thickener.

8. The water-based non-carbon conductive anti-corrosion coating according to claim 1, characterized in that, The wetting agent is a gemini-type organic modified polysiloxane compound; the silane coupling agent contains reactive epoxypropoxy and methoxy groups.

9. The method for preparing the water-based non-carbon-based conductive anti-corrosion coating according to claim 1, characterized in that, The epoxy curing agent is a self-emulsifying nonionic modified amine epoxy curing agent; the flash rust inhibitor is an organozinc chelate.

10. A method for preparing a water-based non-carbon-based conductive anti-corrosion coating as described in any one of claims 1 to 9, characterized in that, include: The preparation of water-based non-carbon conductive electrostatic slurry involves first preparing deionized water, then adding dispersant and defoamer sequentially for dispersion, followed by adding titanium dioxide, aluminum tripolyphosphate, polyaniline, and conductive mica powder for further dispersion, and finally grinding to obtain the water-based non-carbon conductive electrostatic slurry. To prepare component A, a predetermined amount of waterborne epoxy resin was added to the above water slurry, followed by the sequential addition of film-forming aid, wetting agent, and silane coupling agent for dispersion. Finally, a thickener was added for further dispersion to obtain component A of the waterborne non-carbon conductive anti-corrosion coating. Component B is prepared by preparing a predetermined amount of modified amine epoxy curing agent, and then adding deionized water and anti-flash rust agent to disperse them, thus obtaining component B of the water-based non-carbon conductive anti-corrosion coating. The water-based non-carbon conductive anti-corrosion coating is prepared by mixing the prepared component A and component B in a predetermined weight ratio to obtain the water-based non-carbon conductive anti-corrosion coating.

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