A heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating and its preparation method

Abstract

The present application discloses a heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating and a preparation method thereof, belonging to the field of anti-corrosion coatings. The coating is a two-component coating, wherein component A consists of a water-based phenolic epoxy emulsion, a water-based epoxy resin dispersion, glass flakes, an anti-rust pigment, titanium dioxide, a wetting dispersant, a film-forming aid, a silane coupling agent, a rheological aid, a substrate wetting agent, an anti-flash rust agent and water; and component B consists of a cardanol-modified phenolic amine water-based curing agent, a modified fatty amine water-based curing agent, a modified polyamide water-based curing agent, propylene glycol methyl ether and water. The coating has good construction properties and can dry itself at room temperature. It has the technical advantages of low VOC content, strong adhesion, excellent water resistance, boiling resistance, chemical resistance, excellent anti-corrosion performance, and a wide source of raw materials and a simple preparation process.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion coatings, and in particular to a heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating and a preparation method thereof. Background Art

[0002] Carbon steel and concrete used in engineering equipment for petrochemicals, ships, ports, and offshore oil and gas platforms are exposed to harsh marine environments for long periods of time, often experiencing corrosion and rust. This severely impacts the performance and service life of the steel, and can pose significant safety hazards over time. Currently, a variety of metal corrosion protection technologies exist, including electrochemical, electroplating, and organic coatings. Organic coatings are a key technology in this area, offering advantages such as convenient construction, low cost, and easy maintenance.

[0003] Epoxy glass flakes are a new type of highly efficient heavy-duty anti-corrosion coating. Because the flaky glass flakes are in a layered overlapping distribution in the epoxy resin, they delay the penetration of corrosive media, making the coating have a smaller curing shrinkage rate, which can increase the service life and adapt to the anti-corrosion requirements in a variety of corrosive environments. As an anti-corrosion coating, epoxy glass flakes can provide better protection than other epoxy coatings, especially in the field of heavy-duty anti-corrosion. With the vigorous development of electricity, petrochemicals, and modern marine industries, the corrosion protection requirements for steel structures and concrete are increasing year by year. Epoxy glass flakes are undoubtedly a durable anti-corrosion coating. In the future, epoxy glass flake coatings will also develop sustainably in the direction of high durability, high corrosion resistance, low VOC, low cost, and easy construction. However, as an inorganic material, the problem of interface bonding between glass flakes and organic resins needs to be solved urgently.

[0004] Phenolic epoxy coating is a two-component coating that can be cured at room temperature and is composed of phenolic epoxy resin and special amine curing agent. The coating has a high glass transition temperature, excellent mechanical properties and chemical stability. It is resistant to a variety of chemicals and has better resistance to a wide range of inorganic acids, organic acids, salts, alkalis, grease, hot water and organic solvents (including crude oil, alcohol, aromatic and aliphatic solvents) than other types of coatings. It has excellent anti-corrosion performance, so its application field is more extensive. It is the latest generation of long-lasting anti-corrosion coatings, but it is still mainly solvent-based and water-based technology is not yet mature.

[0005] Currently, due to growing environmental awareness, water-based products are becoming increasingly popular. While maintaining the traditional properties of epoxy resins, water-based epoxy resins significantly reduce environmental pollution, offering a broad range of applications. In addition to the excellent properties of traditional solvent-based epoxy resins, water-based epoxy resins also offer advantages such as low VOC content, odorlessness, high safety, and easy construction. Therefore, they have gradually become a research hotspot for improving the corrosion resistance of epoxy coatings.

[0006] Although some companies have launched environmentally friendly water-based glass flake anti-corrosion coatings, mainly based on water-based epoxy resins, there are still a series of difficult-to-overcome shortcomings, such as slow drying, inability to cure at low temperatures, and significant differences in chemical resistance and anti-corrosion performance compared to solvent-based coatings. In actual applications, they are only suitable for carbon steel substrates and have poor adhesion to non-ferrous metal surfaces. Summary of the Invention

[0007] Technical problems to be solved: The purpose of the present invention is to overcome the technical problems existing in the prior art, such as slow drying, inability to cure at low temperature, large difference in chemical resistance and corrosion resistance compared to solvent-based ones, and poor adhesion to non-ferrous metal surfaces. The present application provides a heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating and a preparation method thereof, which is suitable for the surfaces of various substrates such as carbon steel, aluminum alloy, stainless steel, galvanized sheet and concrete, and has technical advantages such as fast drying, good construction performance, low temperature curing, low VOC content, strong adhesion, excellent water resistance, boiling resistance, chemical resistance, and excellent corrosion resistance, and has a wide source of raw materials and a simple preparation process.

[0008] Technical solution: To achieve the above objectives, this application is implemented through the following technical solutions:

[0009] A heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating, comprising 100 parts of component A and 30-45 parts of component B in proportion by mass, wherein:

[0010] The raw materials of component A are proportioned as follows by mass:

[0011] 20-40 parts of water-based phenolic epoxy emulsion;

[0012] 15-30 parts of waterborne epoxy resin dispersion;

[0013] 15-30 parts of glass flakes;

[0014] 1-10 parts of anti-rust pigment;

[0015] 5-15 parts of titanium dioxide;

[0016] Wetting and dispersing agent 0.1~5 parts;

[0017] 1~10 parts of film-forming aid;

[0018] Silane coupling agent 0.1~5 parts;

[0019] Rheological additive 0.1~5 parts;

[0020] 0.1~3 parts of substrate wetting agent;

[0021] 0.1~3 parts of defoaming agent;

[0022] 0.1~3 parts of anti-flash rust agent;

[0023] 0.1~10 parts of water;

[0024] The raw materials of component B are proportioned as follows by mass:

[0025] 20-40 parts of cardanol-modified phenalkamine water-based curing agent;

[0026] 20-30 parts of modified fatty amine water-based curing agent;

[0027] 30-50 parts of modified polyamide water-based curing agent;

[0028] 1-5 parts of propylene glycol methyl ether;

[0029] 1~10 parts water

[0030] Preferably, the water-based phenolic epoxy emulsion is prepared by the following method:

[0031] S1: Maintaining the temperature at 40-50°C in a water bath, add 55-65 parts of novolac epoxy resin, 5-10 parts of MX-795 liquid epoxy resin emulsifier, and 2-8 parts of propylene glycol methyl ether to a reaction vessel A in order by weight, and disperse at 1200-1400 r / min for 30-40 minutes to obtain a pre-emulsion;

[0032] S2: Adjust the rotation speed to 2600~2800 r / min, add 25~40 parts of distilled water dropwise to the pre-emulsion, and maintain 2600~2800 r / min for 20~30 minutes to obtain a water-based phenolic epoxy emulsion.

[0033] Preferably, the glass flakes in component A are a mixture of 80 mesh glass flakes, 120 mesh glass flakes and 200 mesh glass flakes, with the mass ratio of 80 mesh glass flakes: 120 mesh glass flakes: 200 mesh glass flakes = 1:2:3.

[0034] Preferably, the film-forming aid in component A is dipropylene glycol butyl ether.

[0035] Preferably, the silane coupling agent in component A is γ-methacryloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane, with the mass ratio of γ-methacryloxypropyltrimethoxysilane to γ-aminopropyltriethoxysilane being 1.5-2:1.

[0036] Preferably, the rheological additive in component A is a water-based polyamide rheological additive.

[0037] The present application also discloses a method for preparing any of the above-mentioned heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coatings, comprising the following steps:

[0038] The first step is the preparation of component A in waterborne epoxy glass flake anti-corrosion coating:

[0039] Step a: adding a wetting dispersant, an anti-rust pigment, titanium dioxide, and a defoaming agent to water in sequence under low-speed stirring conditions of 300-500 r / min, adjusting the speed to 3300-3500 r / min, and dispersing them evenly until there is no agglomeration or lumps; adding glass flakes and γ-methacryloxypropyltrimethoxysilane in sequence, adjusting the speed to 1600-1800 r / min, and dispersing them evenly until there is no agglomeration or lumps, and aging at a constant temperature of 23°C for 24 hours to obtain a glass flake mixture slurry;

[0040] Step b: adding a water-based phenolic epoxy emulsion, a water-based epoxy resin dispersion, a film-forming aid, a substrate wetting agent, γ-aminopropyltriethoxysilane, an anti-flash rust agent, and a glass flake mixture slurry to a reaction vessel B in sequence under stirring conditions at a rotation speed of 1000 to 1200 r / min, stirring evenly, and then adding a rheological additive to adjust the viscosity of the mixture to 95 to 110 KU to obtain component A in a water-based epoxy glass flake anti-corrosion coating;

[0041] The second step is the preparation of component B in the waterborne epoxy glass flake anti-corrosion coating:

[0042] Step 1: Add propylene glycol methyl ether and water to the reaction vessel C in sequence, and mix them evenly under low-speed stirring at 300-500 r / min;

[0043] Step 2: adding the cardanol-modified phenolic amine water-based curing agent, the modified fatty amine water-based curing agent, and the modified polyamide water-based curing agent in sequence, adjusting the rotation speed to 800-1000 r / min, and stirring evenly to obtain component B in the water-based epoxy glass flake anti-corrosion coating;

[0044] The third step is the preparation of heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating: Mix component A in the water-based epoxy glass flake anti-corrosion coating and component B in the water-based epoxy glass flake anti-corrosion coating in a mass ratio of 100: (30~45) to obtain heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating.

[0045] Preferably, the stirring time in step b is 95 min.

[0046] Preferably, the stirring time in step 1 is 5 minutes, and the stirring time in step 2 is 10 minutes.

[0047] Preferably, the mixing speed in the third step is 400-500 r / min, and the mixing time is 8 min.

[0048] The technical principle of the present invention is: this application adopts a dual-resin film-forming system with water-based phenolic epoxy emulsion and water-based epoxy dispersion as film-forming materials, and uses a compounding method of cashew phenol modified phenolic amine, modified fatty amine and modified polyamide curing agent to achieve synergistic complementarity, and optimizes the performance of the coating system by regulating the ratio of the three to adapt to different corrosion environments; the gradation theory control technology is used to enable three types of lamellar structure glass flakes with different particle sizes to be tightly stacked, effectively improving the coating's ability to resist corrosion medium penetration; by using a double silane modification scheme, on the one hand, a "bridging effect" is achieved between inorganic glass flakes and organic resins, thereby improving the interfacial bonding force and thus increasing the coating's anti-penetration ability, and enhancing the adhesion to the metal substrate, thereby improving the coating's adhesion and resistance; by optimizing the combination of environmentally friendly anti-flash rust agents and environmentally friendly anti-rust pigments, the synergistic effect of organic / inorganic anti-rust pigments is brought into play, providing early-mid-late life cycle protection performance.

[0049] This application provides a heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating and a preparation method thereof, which has the following beneficial effects compared to the prior art:

[0050] 1. The dual-resin film-forming system of the present invention, which uses a water-based phenolic epoxy emulsion and a water-based epoxy dispersion as film-forming materials, has the advantages of fast drying, high hardness, strong adhesion, excellent water resistance, boiling resistance, chemical resistance, and excellent corrosion resistance compared to the water-based epoxy emulsion commonly used in the market. Therefore, it has a wider applicability, a longer protection lifespan, and can significantly reduce maintenance costs throughout the entire life cycle;

[0051] 2. A water-based curing agent is prepared by compounding cardanol-modified phenalkamine, modified fatty amine, and modified polyamide curing agents. These agents complement each other synergistically, leveraging the excellent low-temperature curing and long pot life of the cardanol-modified phenalkamine curing agent NX-8401, the excellent adhesion of the modified fatty amine water-based curing agent Aradur 35-1 to various substrates (carbon steel, aluminum alloy, stainless steel, galvanized sheet, and concrete), and the excellent flexibility and chemical resistance of the modified polyamide water-based curing agent EPIKURE 6870-W-53. By adjusting the ratio of the three, the coating system performance can be optimized to adapt to different corrosive environments.

[0052] 3. The use of gradation theory control technology enables the close stacking of three types of lamellar glass flakes with different particle sizes, giving full play to the shielding effect of the coating similar to the "maze" effect, making the path for the corrosive medium to penetrate the substrate surface more tortuous and complex, effectively improving the coating's ability to resist the penetration of corrosive media. At the same time, using a double silane modification solution, on the one hand, the inorganic glass flakes are modified by γ-methacryloxypropyltrimethoxysilane, achieving a "bridging effect" between the inorganic glass flakes and the organic resin, improving the interfacial bonding strength and thus increasing the coating's anti-penetration ability; on the other hand, by introducing the silane coupling agent Dynasylan® SIVO 140 containing γ-aminopropyltriethoxy, the adhesion to the metal substrate is enhanced, thereby improving the adhesion and resistance of the coating;

[0053] 4. Optimize the combination of environmentally friendly anti-rust agent and environmentally friendly anti-rust pigment, anti-flash rust agent HEUCOFLASH TM LQ2 has strong chemical activity and can passivate metals early on, preventing premature rust after water-based coating application. The highly active organic corrosion inhibitor HEUCORIN® RZ is rapidly released in the early to mid-stage, improving the coating's early protection and wet adhesion to the substrate. The high-performance polyphosphate HEUCOPHOS® CAPP effectively chelates and passivates the substrate in the mid- to late-stage, providing excellent corrosion protection. It also fully leverages the synergistic effects of organic and inorganic anti-rust pigments, delivering full lifecycle protection from early to mid-stage.

[0054] 5. The present invention provides a heavy-duty anti-corrosion water-based epoxy glass flake coating, which has a low VOC content, is safe and environmentally friendly, and is in line with the development direction of green coatings. In addition, the product has good construction properties, is applicable to a variety of substrates, and has excellent comprehensive performance. It can completely replace traditional solvent-based coatings and has broad application prospects. DETAILED DESCRIPTION

[0055] In order to make the technical solutions, advantages and objectives of the present invention clearer and more specific, the present invention is described in detail below through specific embodiments. The embodiments are merely illustrative and do not limit the scope of protection of the patent of the present invention. Any non-essentially equivalent changes or adjustments made based on the above-mentioned invention content and spirit are within the scope of protection of the present invention.

[0056] In component A of the present application: the waterborne epoxy resin dispersion is one or more of Hansen Epikote 6520-WH-53A, Fuqisen AQUAER-3012, and Tongde 3EE104W;

[0057] The anti-rust pigments are HEUCOPHOS® CAPP and HEUCORIN® RZ, with a mass ratio of HEUCOPHOS® CAPP:HEUCORIN® RZ of 8-10:1.

[0058] The titanium dioxide is Tianguang TR-33 titanium dioxide;

[0059] The wetting and dispersing agent is ADDITOL® VXW 6208;

[0060] The silane coupling agents are Shin-Etsu KBM-503 (γ-methacryloxypropyltrimethoxysilane) and Evonik Dynasylan® SIVO 140 (γ-aminopropyltriethoxysilane), with a mass ratio of γ-methacryloxypropyltrimethoxysilane to γ-aminopropyltriethoxysilane of 1.5-2:1.

[0061] The rheological additive is DISPARLON AQ-600 water-based polyamide rheological additive;

[0062] The substrate wetting agent is Shenzhu SN-4763;

[0063] The defoamer was Ashland Drewplus TS-4481;

[0064] Anti-flash rust agent is HEUCOFLASH TM LQ2;

[0065] In component B: the cardanol-modified phenalkamine water-based curing agent is Cardolite NX-8401;

[0066] The modified fatty amine waterborne curing agent was Huntsman Aradur 35-1;

[0067] The modified polyamide water-based curing agent is Hexion EPIKURE 6870-W-53.

[0068] Example 1: A method for preparing a heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating, comprising the following steps:

[0069] The first step is the preparation of component A in waterborne epoxy glass flake anti-corrosion coating:

[0070] Step a: adding a wetting dispersant, an anti-rust pigment, titanium dioxide, and a defoaming agent to water in sequence under low-speed stirring conditions of 300-500 r / min, adjusting the speed to 3300-3500 r / min, and dispersing them evenly until there is no agglomeration or lumps; adding glass flakes and γ-methacryloxypropyltrimethoxysilane in sequence, adjusting the speed to 1600-1800 r / min, and dispersing them evenly until there is no agglomeration or lumps, and aging at a constant temperature of 23°C for 24 hours to obtain a glass flake mixture slurry;

[0071] Step b: maintaining the temperature at 40-50° C. in a water bath, sequentially adding 55-65 parts of a novolac epoxy resin, 5-10 parts of an MX-795 liquid epoxy resin emulsifier, and 2-8 parts of propylene glycol methyl ether to a reaction vessel A in a proportion by mass, and dispersing the mixture at 1200-1400 r / min for 30-40 minutes to obtain a pre-emulsion;

[0072] Step c: adjusting the rotation speed to 2600-2800 r / min, adding 25-40 parts of distilled water dropwise to the pre-emulsion, and maintaining the speed at 2600-2800 r / min for 20-30 minutes to obtain a water-based phenolic epoxy emulsion;

[0073] Step d: adding a water-based phenolic epoxy emulsion, a water-based epoxy resin dispersion, a film-forming aid, a substrate wetting agent, γ-aminopropyltriethoxysilane, an anti-flash rust agent, and a glass flake mixture slurry to the reaction vessel B in sequence under stirring conditions at a speed of 1000-1200 r / min for 95 minutes. After stirring evenly, a rheological additive was added to adjust the viscosity of the mixture to 95-110 KU to obtain component A in the water-based epoxy glass flake anti-corrosion coating;

[0074] The second step is the preparation of component B in the waterborne epoxy glass flake anti-corrosion coating:

[0075] Step 1: Add propylene glycol methyl ether and water to the reaction vessel C in sequence, and stir to mix evenly under low-speed stirring conditions of 300-500 r / min for 5 minutes;

[0076] Step 2: Add the cardanol-modified phenolic amine water-based curing agent, the modified fatty amine water-based curing agent, and the modified polyamide water-based curing agent in sequence, adjust the speed to 800-1000 r / min, stir for 10 minutes, and stir evenly to obtain component B in the water-based epoxy glass flake anti-corrosion coating;

[0077] The third step is the preparation of heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating: evenly mix component A in the water-based epoxy glass flake anti-corrosion coating and component B in the water-based epoxy glass flake anti-corrosion coating in a mass ratio of 100: (30~45), with a mixing speed of 400~500 r / min and a mixing time of 8 minutes to obtain heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating.

[0078] Example 2, Example 3 and Example 4: A method for preparing a heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating. The preparation method is the same as that of Example 1. The specific dosage is shown in Table 1-1.

[0079] Table 1-1 Amount of each component used in Examples 1 to 4 (g): .

[0080] Comparative Examples 1 to 7: A method for preparing an anti-corrosion coating. The preparation method is the same as that of Example 1, and the specific amounts are shown in Table 1-2.

[0081] Table 1-2 Amount of each component in Comparative Examples 1 to 7 (g): .

[0082] Table 2-1 Main technical indicators of coatings: .

[0083] Table 2-2 Main technical indicators of coatings: .

[0084] The test results show that Examples 1 to 4 all obtained heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coatings suitable for the surfaces of various substrates such as carbon steel, aluminum alloy, stainless steel, galvanized sheet and concrete, with fast drying, good workability and low-temperature curing. The coating is a two-component, water-based, room-temperature self-drying product with low VOC content, strong adhesion, excellent water resistance, boiling resistance, chemical resistance, and excellent anti-corrosion performance.

[0085] As can be seen from the results of Comparative Example 1 and Example 1, the preparation process of the aqueous epoxy dispersion is crucial to the performance of the coating. The aqueous phenolic epoxy emulsion prepared by phase inversion with an appropriate amount of propylene glycol methyl ether as a cosolvent has a smaller particle size, better film-forming property, and better adhesion, resistance, and corrosion resistance of the coating. As can be seen from the results of Comparative Example 2 and Example 2, the dual-resin film-forming system using aqueous phenolic epoxy emulsion and aqueous epoxy dispersion as film-forming materials has stronger adhesion, excellent water resistance, boiling resistance, chemical resistance, and excellent corrosion resistance than the single aqueous epoxy emulsion. Therefore, it has a wider applicability and a longer protection life.

[0086] As shown in the results of Comparative Example 3 and Example 3, the compounding of the cardanol-modified phenalkamine water-based curing agent NX-8401 can synergistically complement each other and give full play to the excellent low-temperature curing and long pot life of the phenalkamine curing agent. As shown in the results of Comparative Example 4 and Example 4, the compounding of the modified fatty amine water-based curing agent Aradur 35-1 can improve the adaptability of the coating substrate and improve the adhesion, so that the coating exhibits excellent adhesion on carbon steel, aluminum alloy, stainless steel, galvanized sheet and concrete. The water-based curing agent solution prepared by compounding the cardanol-modified phenalkamine, modified fatty amine and modified polyamide curing agent can optimize the performance of the coating system by regulating the ratio of the three to adapt to different corrosive environments.

[0087] It can be seen from the results of Comparative Example 5 and Example 1 that by adopting the gradation theory control technology, three types of lamellar glass flakes with different particle sizes are selected to achieve tight stacking, and the shielding effect of the coating similar to the "maze" effect is fully utilized, so that the path for the corrosive medium to penetrate into the surface of the substrate becomes more tortuous and complex, effectively improving the coating's ability to resist the penetration of corrosive media, and making the paint film have better heat resistance, chemical resistance and salt spray resistance.

[0088] The results of Comparative Example 6 and Example 1 demonstrate that modifying the inorganic glass flakes with γ-methacryloxypropyltrimethoxysilane creates a "bridging effect" between the inorganic glass flakes and the organic resin, enhancing interfacial bonding and thus increasing the coating's anti-penetration capabilities. Experiments have also shown that adding an appropriate amount of the γ-aminopropyltriethoxysilane coupling agent Dynasylan® SIVO 140 can improve the coating's adhesion and durability on metal substrates.

[0089] The results of Comparative Example 7 and Example 1 demonstrate that adding an appropriate amount of the highly active organic corrosion inhibitor HEUCORIN® RZ, combined with the high-performance polyphosphate HEUCOPHOS® CAPP, significantly enhances the coating's corrosion resistance. The flash rust inhibitor HEUCOFLASH™ LQ2 exhibits strong chemical activity, enabling early metal passivation and preventing premature corrosion after water-based coating application. The organic corrosion inhibitor rapidly releases during the early to mid-stages, enhancing the coating's early protection and wet adhesion to the substrate. The inorganic anti-rust pigment effectively chelates and passivates the substrate during the mid- to late-stages, providing excellent corrosion resistance. This combined approach, while leveraging the synergistic effects of the organic and inorganic anti-rust pigments, provides comprehensive protection throughout the entire lifecycle, from early to mid-stage.

[0090] The above description of the examples is intended to facilitate understanding and application of the invention by those skilled in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made and the general principles described herein can be applied to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating, characterized by: The heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating is composed of 100 parts of component A and 30-45 parts of component B in proportion by mass, wherein: The raw materials of component A are proportioned as follows by mass: 20-40 parts of water-based phenolic epoxy emulsion; 15-30 parts of waterborne epoxy resin dispersion; 15-30 parts of glass flakes; 1-10 parts of anti-rust pigment; 5-15 parts of titanium dioxide; Wetting and dispersing agent 0.1~5 parts; 1~10 parts of film-forming aid; Silane coupling agent 0.1~5 parts; Rheological additive 0.1~5 parts; 0.1~3 parts of substrate wetting agent; 0.1~3 parts of defoaming agent; 0.1~3 parts of anti-flash rust agent; 0.1~10 parts of water; The glass flakes in component A are a mixture of 80 mesh glass flakes, 120 mesh glass flakes and 200 mesh glass flakes; The anti-rust pigments in component A are HEUCOPHOS® CAPP and HEUCORIN® RZ, with a mass ratio of HEUCOPHOS® CAPP:HEUCORIN® RZ of 8-10:1; The silane coupling agent in component A is γ-methacryloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane, with a mass ratio of γ-methacryloxypropyltrimethoxysilane to γ-aminopropyltriethoxysilane of 1.5-2:

1. The raw materials of component B are proportioned as follows by mass: 20-40 parts of cardanol-modified phenalkamine water-based curing agent; 20-30 parts of modified fatty amine water-based curing agent; 30-50 parts of modified polyamide water-based curing agent; 1-5 parts of propylene glycol methyl ether; 1-10 parts water; The water-based phenolic epoxy emulsion is prepared by the following method: S1: Maintaining the temperature at 40-50°C in a water bath, add 55-65 parts of novolac epoxy resin, 5-10 parts of MX-795 liquid epoxy resin emulsifier, and 2-8 parts of propylene glycol methyl ether to a reaction vessel A in order by weight, and disperse at 1200-1400 r / min for 30-40 minutes to obtain a pre-emulsion; S2: Adjust the rotation speed to 2600~2800 r / min, add 25~40 parts of distilled water dropwise to the pre-emulsion, and maintain 2600~2800 r / min for 20~30 minutes to obtain a water-based phenolic epoxy emulsion.

2. The heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating according to claim 1, characterized in that: The mass ratio of 80 mesh glass flakes: 120 mesh glass flakes: 200 mesh glass flakes is 1:2:

3.

3. The heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating according to claim 1, characterized in that: The film-forming aid in the component A is dipropylene glycol butyl ether.

4. The heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating according to claim 1, characterized in that: The rheological additive in the component A is a water-based polyamide rheological additive.

5. A method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to any one of claims 1 to 4, characterized in that: The following steps are involved: The first step is the preparation of component A in waterborne epoxy glass flake anti-corrosion coating: Step a: adding a wetting dispersant, an anti-rust pigment, titanium dioxide, and a defoaming agent to water in sequence under low-speed stirring conditions of 300-500 r / min, adjusting the speed to 3300-3500 r / min, and dispersing them evenly until there is no agglomeration or lumps; adding glass flakes and γ-methacryloxypropyltrimethoxysilane in sequence, adjusting the speed to 1600-1800 r / min, and dispersing them evenly until there is no agglomeration or lumps, and aging at a constant temperature of 23°C for 24 hours to obtain a glass flake mixture slurry; Step b: adding a water-based phenolic epoxy emulsion, a water-based epoxy resin dispersion, a film-forming aid, a substrate wetting agent, γ-aminopropyltriethoxysilane, an anti-flash rust agent, and a glass flake mixture slurry to a reaction vessel B in sequence under stirring conditions at a rotation speed of 1000 to 1200 r / min, stirring evenly, and then adding a rheological additive to adjust the viscosity of the mixture to 95 to 110 KU to obtain component A in a water-based epoxy glass flake anti-corrosion coating; The second step is the preparation of component B in the waterborne epoxy glass flake anti-corrosion coating: Step 1: Add propylene glycol methyl ether and water to the reaction vessel C in sequence, and mix them evenly under low-speed stirring at 300-500 r / min; Step 2: adding the cardanol-modified phenolic amine water-based curing agent, the modified fatty amine water-based curing agent, and the modified polyamide water-based curing agent in sequence, adjusting the rotation speed to 800-1000 r / min, and stirring evenly to obtain component B in the water-based epoxy glass flake anti-corrosion coating; The third step is the preparation of heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating: Mix component A in the water-based epoxy glass flake anti-corrosion coating and component B in the water-based epoxy glass flake anti-corrosion coating in a mass ratio of 100: (30~45) to obtain heavy-duty anti-corrosion water-based epoxy glass flake anti-corrosion coating.

6. The method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to claim 5, characterized in that: The stirring time in step b is 95 min.

7. The method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to claim 5, characterized in that: The stirring time in step 1 is 5 min, and the stirring time in step 2 is 10 min.

8. The method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to claim 5, characterized in that: The mixing speed in the third step is 400-500 r / min, and the mixing time is 8 min.