Heavy-duty water-based epoxy glass flake anticorrosive paint and preparation method thereof

Abstract

The invention discloses a heavy-duty waterborne epoxy glass flake anticorrosive coating and a preparation method thereof, and belongs to the field of anticorrosive coatings. Wherein the component A is composed 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 coalescing agent, a silane coupling agent, a rheological agent, a base material wetting agent, an anti-flash-rust agent and water; the component B consists of a cardanol modified phenolic aldehyde amine water-based curing agent, a modified aliphatic amine water-based curing agent, a modified polyamide water-based curing agent, propylene glycol monomethyl ether and water; the coating is good in constructability, can be self-dried at normal temperature, has the technical advantages of low VOC (volatile organic compound) content, strong adhesive force, excellent water resistance, boiling resistance and chemical resistance, excellent corrosion resistance and the like, and is wide in raw material source and simple in preparation process.

Description

Technical Field

[0001] The present invention relates to the technical field of anticorrosive coatings, and particularly to a waterborne epoxy glass flake anticorrosive coating for heavy corrosion and a preparation method thereof. Background Art

[0002] Carbon steel and concrete used in engineering equipment such as petrochemical, shipbuilding, port terminals, and offshore oil and gas platforms are often in a harsh marine environment for a long time, and corrosion and rusting often occur, seriously affecting the service performance and service life of steel. Over time, it is likely to cause relatively large potential safety hazards. At present, there are various metal corrosion protection technologies such as electrochemistry, electroplating, and organic coatings. Among them, organic coatings are one of the important technologies in metal corrosion protection, and have the advantages of convenient construction, low cost, and easy maintenance.

[0003] Epoxy glass flake is a new type of high-efficiency heavy corrosion coating. Due to the layered overlapping distribution of flaky glass flakes in epoxy resin, the penetration of corrosive media is delayed, the coating has a small curing shrinkage rate, can increase the service life, and meet the anticorrosion requirements in various corrosive environments. As an anticorrosive coating, especially in the field of heavy corrosion, epoxy glass flake can play a better protective role than other epoxy coatings. With the booming development of the power, petrochemical, and modern marine industries, the corrosion protection requirements for steel structures and concrete are increasing year by year. Undoubtedly, epoxy glass flake is a durable anticorrosive coating. In the future, epoxy glass flake coatings will also develop sustainably in the directions of high durability, high anticorrosion, low VOC, low cost, and easy construction. However, as an inorganic material, the interfacial bonding problem 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 relatively high glass transition temperature, excellent mechanical properties and chemical stability, can resist a variety of chemicals, and has better resistance to a wide range of inorganic acids, organic acids, salts, alkalis, oils, hot water, and organic solvents (including crude oil, alcohols, aromatic and aliphatic solvents) than other coating varieties. It has excellent anticorrosion performance, so its application field is wider. It is the latest generation of long-term anticorrosive coating at present, but it is still mainly solvent-based, and the waterborne technology is not yet mature.

[0005] Currently, due to the enhanced environmental awareness, waterborne products are more and more favored. Waterborne epoxy resin greatly reduces environmental pollution while ensuring the traditional properties of epoxy resin, and has a very broad application prospect. In addition to having the excellent properties of traditional solvent-based epoxy resin, waterborne epoxy resin also has the advantages of low VOC content, no odor, high use safety, and convenient construction operation. Therefore, it has gradually become a research hotspot to improve the corrosion resistance of epoxy coatings.

[0006] Although some enterprises have currently launched environmentally friendly waterborne glass flake anticorrosive coatings, which are mainly based on waterborne epoxy resins, there are always a series of drawbacks that are difficult to overcome. For example, they have a slow drying speed, cannot be cured at low temperatures, and there are still significant differences in chemical resistance and anticorrosive performance compared with solvent-based coatings. In actual applications, they are only applicable to carbon steel substrates and have problems such as 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 speed, inability to be cured at low temperatures, significant differences in chemical resistance and anticorrosive performance compared with solvent-based coatings, only being applicable to carbon steel substrates in actual applications, and poor adhesion to non-ferrous metal surfaces. This application provides a waterborne epoxy glass flake anticorrosive coating for heavy corrosion protection and its preparation method, which is applicable to 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 speed, good workability, can be cured at low temperatures, low VOC content, strong adhesion, excellent water resistance, boiling water resistance, chemical resistance, and extremely good anticorrosive performance, and the raw materials are widely sourced and the preparation process is simple.

[0008] Technical solution: To achieve the above purpose, this application is realized through the following technical solutions: A waterborne epoxy glass flake anticorrosive coating for heavy corrosion protection is composed of 100 parts of component A and 30 - 45 parts of component B according to the mass ratio. Among them: The raw materials of component A are proportioned by mass as follows: Waterborne phenolic epoxy emulsion: 20 - 40 parts; Waterborne epoxy resin dispersion: 15 - 30 parts; Glass flake: 15 - 30 parts; Rust-inhibiting pigment: 1 - 10 parts; Titanium dioxide: 5 - 15 parts; Wetting and dispersing agent: 0.1 - 5 parts; Film-forming aid: 1 - 10 parts; Silane coupling agent: 0.1 - 5 parts; Rheology aid: 0.1 - 5 parts; Substrate wetting agent: 0.1 - 3 parts; Defoaming agent: 0.1 - 3 parts; Flash rust inhibitor: 0.1 - 3 parts; Water: 0.1 - 10 parts; The raw materials of component B are proportioned by mass as follows: Cardanol-modified phenolic amine waterborne curing agent: 20 - 40 parts; Modified aliphatic amine waterborne curing agent: 20 - 30 parts; Modified polyamide waterborne curing agent: 30 - 50 parts; 1 - 5 parts of propylene glycol methyl ether; 1 - 10 parts of water.

[0009] Preferably, the aqueous phenolic epoxy emulsion is prepared by the following method: S1: Keep at 40 - 50 °C under water bath conditions. Add 55 - 65 parts of phenolic epoxy resin, 5 - 10 parts of MX - 795 liquid epoxy resin emulsifier, and 2 - 8 parts of propylene glycol methyl ether into reaction vessel A in accordance with the mass ratio, and disperse at 1200 - 1400 r / min for 30 - 40 min 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 keep dispersing at 2600 - 2800 r / min for 20 - 30 min to obtain the aqueous phenolic epoxy emulsion.

[0010] Preferably, the glass flakes in component A are a mixture of 80 - mesh glass flakes, 120 - mesh glass flakes, and 200 - mesh glass flakes, and the mass ratio of 80 - mesh glass flakes: 120 - mesh glass flakes: 200 - mesh glass flakes = 1:2:3.

[0011] Preferably, the film - forming aid in component A is dipropylene glycol butyl ether.

[0012] Preferably, the silane coupling agents in component A are γ - methacryloyloxypropyltrimethoxysilane and γ - aminopropyltriethoxysilane, and the mass ratio of γ - methacryloyloxypropyltrimethoxysilane: γ - aminopropyltriethoxysilane = 1.5 - 2:1.

[0013] Preferably, the rheology additive in component A is an aqueous polyamide rheology additive.

[0014] This application also discloses a preparation method of the above - mentioned heavy - duty anti - corrosion water - borne epoxy glass flake anti - corrosion coating, including the following steps: The first step, preparation of component A in the water - borne epoxy glass flake anti - corrosion coating: Step a: Add a wetting and dispersing agent, a rust - inhibiting pigment, titanium dioxide, and an antifoaming agent to water in sequence under the condition of low - speed stirring at 300 - 500 r / min, adjust the rotation speed to 3300 - 3500 r / min, and disperse evenly until there is no agglomeration or caking; add glass flakes and γ - methacryloyloxypropyltrimethoxysilane in sequence, adjust the rotation speed to 1600 - 1800 r / min, and disperse evenly until there is no agglomeration or caking. After aging at a constant temperature of 23 °C for 24 h, a glass flake mixture slurry is obtained; Step b: adding water-based phenolic epoxy emulsion, water-based epoxy resin dispersion, film-forming aid, substrate wetting agent, γ-aminopropyl triethoxysilane, anti-flash rust agent, and glass flake mixture slurry to reaction container B in sequence under stirring conditions of a rotation speed of 1000-1200 r / min, stirring evenly, adding a rheological aid to adjust the viscosity of the mixture to 95-110 KU, and obtaining component A in a water-based epoxy glass flake anticorrosive coating; The second step is the preparation of component B in the waterborne epoxy glass flake anticorrosive 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: 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 rotation speed to 800-1000 r / min, and stir evenly to obtain component B in the water-based epoxy glass flake anticorrosive 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.

[0015] Preferably, the stirring time in step b is 95 min.

[0016] Preferably, the stirring time in step 1 is 5 min, and the stirring time in step 2 is 10 min.

[0017] Preferably, the mixing speed in the third step is 400-500 r / min, and the mixing time is 8 min.

[0018] The technical principle of the present invention is: the present application adopts a dual-resin film-forming system with water-based phenolic epoxy emulsion and water-based epoxy dispersion as film-forming materials, and utilizes a compounding method of cardanol-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 regulation technology is adopted 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" between inorganic glass flakes and organic resins is achieved, the interface bonding force is improved to increase the coating's anti-penetration ability, and the adhesion to the metal substrate is enhanced, thereby improving the coating's adhesion and durability; by optimizing the combination of environmentally friendly flash rust inhibitors and environmentally friendly anti-rust pigments, the synergistic effect of organic / inorganic anti-rust pigments is brought into play, providing early-mid-late full life cycle protection performance.

[0019] The present application provides a heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating and a preparation method thereof, which has the following beneficial effects compared to the prior art: 1. The dual-resin film-forming system of the present invention uses water-based phenolic epoxy emulsion and water-based epoxy dispersion as film-forming materials. Compared with the water-based epoxy emulsion commonly used in the market, this solution has the advantages of fast drying, high hardness, strong adhesion, excellent water resistance, boiling resistance, chemical resistance, and excellent anti-corrosion performance. Therefore, it has a wider applicability and a longer protection period, which can greatly reduce the maintenance cost of the entire life cycle; 2. The water-based curing agent is prepared by compounding cardanol-modified phenolic amine, modified fatty amine and modified polyamide curing agent. They can complement each other and give full play to the excellent low-temperature curing function and long application period of cardanol-modified phenolic amine curing agent NX-8401, the excellent adhesion of 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 modified polyamide water-based curing agent EPIKURE 6870-W-53. The performance of the coating system can be optimized by adjusting the ratio of the three to adapt to different corrosive environments; 3. The gradation theory control technology is used to achieve close stacking of three different particle sizes of lamellar glass flakes, giving full play to the shielding effect of the coating similar to the "maze" effect, making the path for the corrosive medium to penetrate into the substrate surface more tortuous and complex, effectively improving the coating's ability to resist the penetration of corrosive media. At the same time, the double silane modification scheme is used. On the one hand, the inorganic glass flakes are modified by γ-methacryloxypropyltrimethoxysilane to achieve a "bridging effect" between the inorganic glass flakes and the organic resin, thereby improving the interface bonding force 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 improved, thereby improving the adhesion and durability of the coating; 4. Optimize the combination of environmentally friendly anti-rust agent and environmentally friendly anti-rust pigment, anti-rust agent HEUCOFLASH TM LQ2 has extremely strong chemical activity and can passivate metals at an early stage, thus avoiding early rust after the water-based coating is applied. The highly active organic corrosion inhibitor HEUCORIN® RZ can be quickly released in the early to mid-term to improve the early protection and wet adhesion of the coating to the substrate. The high-performance polyphosphate HEUCOPHOS® CAPP can achieve strong chelation and passivation effects on the substrate in the mid- to late-term, providing excellent anti-corrosion performance, and can give full play to the synergistic effect of organic / inorganic anti-rust pigments, providing early-mid-term-late-term protection performance throughout the entire life cycle. 5. The waterborne epoxy glass flake coating of the present invention has low VOC content, is safe and environmentally friendly, conforms to the development direction of green coatings, has good workability, 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 implementation mode

[0020] To make the technical solutions, advantages and achieved purposes of the present invention clearer and more definite, the present invention will be described in detail through specific embodiments below. The embodiments are merely illustrative and do not represent a limitation on the protection scope of the invention patent. All non-essential equivalent changes or adjustments made according to the above invention content and spirit essence fall within the protection scope of the present invention.

[0021] In component A of this application: the waterborne epoxy resin dispersion is one or several of Hexion Epikote 6520-WH-53A, Fuqisen AQUAER-3012, and Tongde 3EE104W; The anti-rust pigments are HEUCOPHOS® CAPP and HEUCORIN® RZ, and the mass ratio of HEUCOPHOS® CAPP:HEUCORIN® RZ = 8-10:1; The titanium dioxide is Tianguang TR-33 titanium dioxide; The wetting and dispersing agent is ADDITOL® VXW 6208; The silane coupling agents are Shin-Etsu KBM-503 (γ-methacryloxypropyltrimethoxysilane) and Evonik Dynasylan® SIVO 140 (γ-aminopropyltriethoxysilane), and the mass ratio of γ-methacryloxypropyltrimethoxysilane:γ-aminopropyltriethoxysilane = 1.5-2:1; The rheology additive is DISPARLON AQ-600 waterborne polyamide rheology additive; The substrate wetting agent is Shenzhu SN-4763; The defoaming agent is Ashland Drewplus TS-4481; The anti-flooding and rusting agent is HEUCOFLASH TM LQ2; In component B: the cardanol-modified phenolic amine waterborne curing agent is Cardolite NX-8401; The modified aliphatic amine waterborne curing agent is Huntsman Aradur 35-1; The modified polyamide waterborne curing agent is Hexion EPIKURE 6870-W-53.

[0022] Example 1: A preparation method of a heavy-duty anti-corrosion waterborne epoxy glass flake anti-corrosion coating, comprising the following steps: Step 1: Preparation of Component A in the waterborne epoxy glass flake anticorrosive coating: Step a: Under the condition of low-speed stirring at 300 - 500 r / min, add a wetting and dispersing agent, a rust-inhibiting pigment, titanium dioxide, and an antifoaming agent to water in sequence. Adjust the rotation speed to 3300 - 3500 r / min and disperse evenly until there is no agglomeration or caking. Add glass flakes and γ-methacryloxypropyltrimethoxysilane in sequence, adjust the rotation speed to 1600 - 1800 r / min, and disperse evenly until there is no agglomeration or caking. After aging at a constant temperature of 23°C for 24 h, a glass flake mixture slurry is obtained; Step b: Keep the temperature at 40 - 50°C under the water bath condition. Add 55 - 65 parts of phenolic epoxy resin, 5 - 10 parts of MX-795 liquid epoxy resin emulsifier, and 2 - 8 parts of propylene glycol methyl ether to reaction vessel A in sequence according to the mass ratio. Disperse at 1200 - 1400 r / min for 30 - 40 min to obtain a pre-emulsion; Step c: Adjust the rotation speed to 2600 - 2800 r / min, and gradually add 25 - 40 parts of distilled water dropwise to the pre-emulsion, and keep dispersing at 2600 - 2800 r / min for 20 - 30 min to obtain a waterborne phenolic epoxy emulsion; Step d: Under the stirring condition of 1000 - 1200 r / min, add the waterborne phenolic epoxy emulsion, waterborne epoxy resin dispersion, film-forming aid, substrate wetting agent, γ-aminopropyltriethoxysilane, anti-flash rust agent, and glass flake mixture slurry to reaction vessel B in sequence. The stirring time is 95 min. After stirring evenly, add a rheology aid to adjust the viscosity of the mixture to 95 - 110 KU to obtain Component A in the waterborne epoxy glass flake anticorrosive coating; Step 2: Preparation of Component B in the waterborne epoxy glass flake anticorrosive coating: Step 1: Add propylene glycol methyl ether and water to reaction vessel C in sequence, and stir and mix evenly under the condition of low-speed stirring at 300 - 500 r / min. The stirring time is 5 min; Step 2: Add a cardanol-modified phenolic amine waterborne curing agent, a modified fatty amine waterborne curing agent, and a modified polyamide waterborne curing agent in sequence, adjust the rotation speed to 800 - 1000 r / min, and stir for 10 min to stir evenly to obtain Component B in the waterborne epoxy glass flake anticorrosive coating; Step 3: Preparation of the heavy-duty anticorrosion waterborne epoxy glass flake anticorrosive coating: Mix Component A and Component B in the waterborne epoxy glass flake anticorrosive coating evenly according to the mass ratio of 100:(30 - 45). The mixing and stirring speed is 400 - 500 r / min, and the mixing and stirring time is 8 min to obtain the heavy-duty anticorrosion waterborne epoxy glass flake anticorrosive coating.

[0023] 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, and the specific amounts are shown in Table 1-1.

[0024] Table 1-1 Amount of each component used in Example 1 to Example 4 (g): .

[0025] 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.

[0026] Table 1-2 Amount of each component in Comparative Examples 1 to 7 (g): .

[0027] Table 2-1 Main technical indicators of coatings: .

[0028] Table 2-2 Main technical indicators of coatings: .

[0029] 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 construction performance 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.

[0030] From the results of Comparative Example 1 and Example 1, it can be seen that the preparation process of the water-based epoxy dispersion is crucial to the performance of the coating. The water-based phenolic epoxy emulsion prepared by phase inversion with an appropriate amount of propylene glycol methyl ether as a solvent has a smaller particle size, better film-forming property, and better adhesion, resistance and anti-corrosion performance of the coating. From the results of Comparative Example 2 and Example 2, it can be seen that the dual-resin film-forming system using water-based phenolic epoxy emulsion and water-based epoxy dispersion as film-forming materials has strong adhesion, excellent water resistance, water boiling resistance, chemical resistance, and excellent anti-corrosion performance compared to the single use of water-based epoxy emulsion. Therefore, it has a wider applicability and a higher protection period.

[0031] As can be seen from the results of Comparative Example 3 and Example 3, the compounded cardanol-modified phenolic amine water-based curing agent NX-8401 can be synergistically complementary, and can bring into play the excellent low-temperature curing and long application period of the phenolic amine curing agent. As can be seen from the results of Comparative Example 4 and Example 4, the compounded 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 is prepared by compounding cardanol-modified phenolic amine, modified fatty amine and modified polyamide curing agent, and the coating system performance can be optimized by adjusting the ratio of the three to adapt to different corrosive environments.

[0032] It can be seen from the results of Comparative Example 5 and Example 1 that by adopting the grading theory control technology, three 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, and the coating's ability to resist the penetration of corrosive media is effectively improved, so that the paint film has better heat resistance, chemical resistance and salt spray resistance.

[0033] From the results of Comparative Example 6 and Example 1, it can be seen that by modifying the inorganic glass flakes with γ-methacryloxypropyltrimethoxysilane, the "bridging effect" between the inorganic glass flakes and the organic resin is achieved, the interfacial bonding strength is improved, and thus the anti-penetration ability of the coating is increased. In the experiment, it was found that adding an appropriate amount of γ-aminopropyltriethoxy silane coupling agent Dynasylan® SIVO 140 can improve the adhesion and durability of the coating on the metal substrate.

[0034] From the results of Comparative Example 7 and Example 1, it can be seen that adding an appropriate amount of highly active organic corrosion inhibitor HEUCORIN® RZ and compounding it with high-performance polyphosphate HEUCOPHOS® CAPP can greatly improve the anti-corrosion performance of the coating. The flash rust inhibitor HEUCOFLASHTM LQ2 has extremely strong chemical activity and can achieve metal passivation in the early stage, avoiding early rust after the construction of the water-based coating; the organic corrosion inhibitor can be quickly released in the early-middle stage to improve the early protection and wet adhesion of the coating to the substrate; the inorganic anti-rust pigment can achieve strong chelation and passivation of the substrate in the middle-late stage, providing excellent anti-corrosion performance in the late stage. Through the combination scheme, the synergistic effect of organic / inorganic anti-rust pigments can be fully exerted to provide early-middle-late full life cycle protection performance.

[0035] The above description of the examples is provided to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating, characterized in that: The heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating is composed of 100 parts of component A and 30-45 parts of component B in terms of mass fraction, wherein: The raw materials of component A are proportioned by mass as follows: 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; Titanium dioxide 5-15 parts; 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; Defoaming agent 0.1~3 parts; Anti-flash rust agent 0.1~3 parts; 0.1~10 parts of water; The raw materials of component B are proportioned by mass as follows: 20-40 parts of cardanol modified phenolic amine 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; Propylene glycol methyl ether 1-5 parts; 1~10 parts water 2. The heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating according to claim 1, characterized in that: The water-based phenolic epoxy emulsion is prepared by the following method: S1: Keep the temperature at 40-50°C in a water bath, add 55-65 parts of phenolic epoxy resin, 5-10 parts of MX-795 liquid epoxy resin emulsifier, and 2-8 parts of propylene glycol methyl ether in the reaction vessel A in order by mass, and disperse at 1200-1400 r / min for 30-40 minutes to obtain a pre-emulsion; S2: Adjust the rotation speed to 2600~2800r / min, add 25~40 parts of distilled water dropwise to the pre-emulsion, and maintain 2600~2800r / min for dispersion for 20~30min to obtain a water-based phenolic epoxy emulsion.

3. The heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating according to claim 1, characterized in that: 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.

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

5. The heavy-duty anticorrosion water-based epoxy glass flake anticorrosion coating according to claim 1, characterized in that: The silane coupling agent in the component A is γ-methacryloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane, and the mass ratio of γ-methacryloxypropyltrimethoxysilane to γ-aminopropyltriethoxysilane is 1.5-2:

1.

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

7. A method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: The first step is the preparation of component A in waterborne epoxy glass flake anticorrosive coating: Step a: under the condition of low-speed stirring at 300-500 r / min, add a wetting dispersant, an anti-rust pigment, titanium dioxide, and a defoaming agent to water in sequence, adjust the speed to 3300-3500 r / min, and disperse evenly until there is no agglomeration or lumps; add glass flakes and γ-methacryloxypropyltrimethoxysilane in sequence, adjust the speed to 1600-1800 r / min, disperse evenly until there is no agglomeration or lumps, and obtain a glass flake mixture slurry after constant temperature aging at 23°C for 24 hours; Step b: adding water-based phenolic epoxy emulsion, water-based epoxy resin dispersion, film-forming aid, substrate wetting agent, γ-aminopropyl triethoxysilane, anti-flash rust agent, and glass flake mixture slurry to reaction container B in sequence under stirring conditions of a rotation speed of 1000-1200 r / min, stirring evenly, adding a rheological aid to adjust the viscosity of the mixture to 95-110 KU, and obtaining component A in a water-based epoxy glass flake anticorrosive coating; The second step is the preparation of component B in the waterborne epoxy glass flake anticorrosive 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: 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 rotation speed to 800-1000 r / min, and stir evenly to obtain component B in the water-based epoxy glass flake anticorrosive 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.

8. The method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to claim 7, characterized in that: The stirring time in step b is 95 min.

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

10. The method for preparing the heavy-duty anticorrosive water-based epoxy glass flake anticorrosive coating according to claim 7, characterized in that: The mixing speed in the third step is 400-500 r / min, and the mixing time is 8 min.