A rust-proofing coating of acrylic polyether diol gallic acid ester grafted modified epoxy resin and a preparation method thereof

Abstract

The application provides a rusted acrylic polyether glycol gallate graft modified epoxy resin anticorrosive paint and a preparation method thereof, and belongs to the technical field of anticorrosive paint. The acrylic polyether glycol gallate is used for graft modification of the epoxy resin, and an acrylic polyether glycol gallate graft modified epoxy resin with a special hydrophilic network structure is prepared. The anticorrosive paint prepared by compounding a component A based on the resin emulsion with a component B including a modified amine curing agent and a fatty amine curing agent according to a mass ratio of (5-10):1 has good adhesion and anticorrosive performance, and the paint has the advantages of simple construction and low cost without rust treatment during use.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to an acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating and its preparation method. Background Technology

[0002] Among various anti-corrosion methods currently available, coating protection is the most widely used. This method has advantages such as good protective effect, low cost, and simple operation. However, conventional anti-corrosion coatings often require the removal of rust products from the steel to the Sa2.5 level before coating. In addition, due to construction limitations, some structures can only be derusted manually or with power tools during maintenance, resulting in unsatisfactory rust removal and affecting the anti-corrosion effect and service life of the subsequent anti-corrosion coating. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides an acrylic polyether diol gallate-grafted modified epoxy resin rust-resistant anti-corrosion coating and its preparation method. This invention involves grafting acrylic polyether diol gallate onto epoxy resin to obtain an epoxy resin emulsion containing gallate on its side chains. Diethanolamine is modified with a phenolic benzoic acid compound to obtain an amine curing agent containing phenolic hydroxyl groups. The modified epoxy resin emulsion and the amine curing agent containing phenolic hydroxyl groups are then used together in an anti-corrosion coating to obtain a modified epoxy resin rust-resistant anti-corrosion coating in which the side chains, side chain ends, and main chain all contain several polar groups. Without altering the good physical and mechanical properties of the main chain epoxy resin, the flexible long chains and the polar groups at the ends of the long chains passivate rust and inhibit further corrosion of the steel. During the epoxy resin curing process, the flexible long chains can also synergistically interact with fillers to promote adhesion, exhibiting excellent anti-corrosion performance.

[0004] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0005] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 40-60 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 5-10 parts of pigment, 20-40 parts of filler, 2-4 parts of dispersant, 2-4 parts of defoamer, 2-4 parts of adhesion promoter, 2-4 parts of mildew inhibitor, and 5-15 parts of water;

[0006] Component B comprises: 45-55 parts of aliphatic amine curing agent, 5-10 parts of modified amine curing agent, and 35-50 parts of water;

[0007] The mass ratio of component A to component B is (5~10):1;

[0008] The structural formula of the acrylic polyether diol gallate grafted epoxy resin in the acrylic polyether diol gallate grafted epoxy resin emulsion is as follows:

[0009]

[0010] The modified amine curing agent is obtained by mixing and heating raw materials including p-toluenesulfonic acid, diethanolamine, and phenolic benzoic acid compounds.

[0011] To address the problems of existing anti-corrosion coatings requiring rust removal from steel before application and their poor anti-corrosion effect, this invention employs acrylic polyether diol gallate to graft-modify epoxy resin. The polyether diol possesses a large, flexible, long-chain structure; the larger the molecular weight of the long chain, the longer its length, resulting in better mobility and resin permeability. The flexible long chains of the polyether diol, in conjunction with the gallate at the chain ends and the epoxy resin backbone, form a unique network structure. This network structure significantly improves the adhesion of the anti-corrosion coating. Furthermore, as the length of the flexible long chains of the polyether diol increases, the adhesion of the coating initially increases and then decreases. In addition, the flexible long chains of this network structure can penetrate into the pores of rust, effectively passivating metal ions in deep rust and further enhancing anti-corrosion performance. The anti-corrosion coating based on this resin emulsion, with the synergy of a composite amine curing agent (modified amine curing agent and aliphatic amine curing agent), exhibits excellent adhesion and anti-corrosion performance.

[0012] Preferably, the mass ratio of p-toluenesulfonic acid, diethanolamine, and phenolic benzoic acid compound is 1:15:10.

[0013] Preferably, the preparation method of the acrylic polyether diol gallate grafted modified epoxy resin emulsion includes the following steps:

[0014] (1) Dissolve the epoxy resin in a blending solvent and heat it to 80~90 ℃ for pre-dissolution;

[0015] (2) Under a nitrogen atmosphere, the initiator and polyether acrylic acid diol gallate are added to the solution in step (1) in sequence, and reacted at 100~120℃ for 2~4 h;

[0016] (3) Cool down to 60~80 ℃ and adjust the pH of the reaction system to 6~8. Continue the reaction at 60~80 ℃ for 0.5~1 h. Disperse the epoxy resin emulsion with a solid content of 45%~52% by using a high-speed disperser at a speed of 8000~12000 r / min for 5~15 min.

[0017] More preferably, the blending solvent is obtained by uniformly mixing n-butanol and ethylene glycol monobutyl ether at a volume ratio of (2~4):1.

[0018] More preferably, the mass ratio of the epoxy resin, initiator, and polyether acrylate diol gallate is 110:1:10.

[0019] More preferably, the mass-to-volume ratio of the epoxy resin to the blending solvent (g / mL) is (100~120):200.

[0020] More preferably, the initiator is a peroxide initiator.

[0021] Preferably, the preparation method of the modified amine curing agent includes the following steps:

[0022] p-Toluenesulfonic acid and diethanolamine are mixed in toluene to obtain a mixed solution. Then, a phenolic benzoic acid compound is added to the mixed solution, and the temperature is raised to 100~120 °C to react. After cooling to room temperature, a modified amine curing agent containing a phenolic hydroxyl structure is obtained.

[0023] Alternatively, the phenolic benzoic acid compound is 2,3-diphenol benzoic acid.

[0024] Alternatively, the mass-to-volume ratio of the diethanolamine to toluene (g / mL) is (60~80):200.

[0025] Preferably, the preparation method of the acrylic polyether diol gallate is as follows:

[0026] (1) Add hydroquinone and p-toluenesulfonic acid to toluene, heat to 80~90 ℃ until completely dissolved, then add to polyether diol gallate and mix evenly;

[0027] (2) Under a nitrogen atmosphere, acrylic acid is added to the solution from step (1), and the reaction is carried out at 75-85 °C for 4-6 h to remove toluene, thereby obtaining polyether diol gallate of acrylic acid; the structural formula of the polyether diol gallate of acrylic acid is as follows:

[0028]

[0029] Preferably, the polyether diol gallate is prepared as follows:

[0030] (1) Mix p-toluenesulfonic acid and polyether diol in toluene to completely dissolve p-toluenesulfonic acid;

[0031] (2) Gallic acid is added to the solution from step (1), and the temperature is raised to 100-110 °C for 4-6 h to obtain polyether diol gallic ester; the structural formula of the polyether diol gallic ester is as follows:

[0032]

[0033] More preferably, the polyether diol has an average molecular weight of 1000 to 8000.

[0034] More preferably, the polyether diol has an average molecular weight of 4000.

[0035] Preferably, the pigment is selected from one or more of titanium dioxide, carbon black, molybdate, and chromate.

[0036] Preferably, the filler is selected from one or more of wollastonite, talc, light calcium carbonate, and barium sulfate.

[0037] Preferably, the dispersant is selected from one or more of modified polycarboxylate salts and modified organosiloxanes.

[0038] Preferably, the defoamer is selected from one or more of silicone-based defoamers and mineral oil-based defoamers.

[0039] Preferably, the adhesion promoter is 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane.

[0040] Preferably, the antifungal agent is an isothiazolinone compound.

[0041] The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating includes the following steps:

[0042] Preparation of Component A: Weigh each raw material according to the weight proportions, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry, heat the mixed slurry at 40~80 ℃ for 1~2 h to obtain Component A;

[0043] Preparation of Component B: Mix fatty amine curing agent, modified amine curing agent and water evenly to obtain Component B;

[0044] Component A and component B are mixed evenly according to the mass ratio to obtain acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating.

[0045] Preferably, the fineness of the mixed slurry is 20~50 μm.

[0046] Compared with the prior art, the advantages of the present invention are:

[0047] The acrylic polyether diol gallate grafted modified epoxy resin anti-corrosion coating provided by this invention has good adhesion and anti-corrosion performance. The acrylic polyether diol gallate grafted modified epoxy resin in the coating can penetrate into the pores of the rust, fully passivating the metal ions in the rust and inhibiting further corrosion of the steel. When using this coating, there is no need to treat the rust, which has the advantages of simple construction and low cost. Detailed Implementation

[0048] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] This invention provides an acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating, comprising component A and component B; by weight, component A comprises: 40-60 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 5-10 parts of pigment, 20-40 parts of filler, 2-4 parts of dispersant, 2-4 parts of defoamer, 2-4 parts of adhesion promoter, 2-4 parts of mildew inhibitor, and 5-15 parts of water;

[0050] Component B comprises: 45-55 parts of aliphatic amine curing agent, 5-10 parts of modified amine curing agent, and 35-50 parts of water;

[0051] The mass ratio of component A to component B is (5~10):1;

[0052] The structural formula of the acrylic polyether diol gallate grafted epoxy resin in the acrylic polyether diol gallate grafted epoxy resin emulsion is as follows:

[0053]

[0054] The modified amine curing agent is obtained by mixing and heating raw materials including p-toluenesulfonic acid, diethanolamine, and phenolic benzoic acid compounds.

[0055] In some examples, the pigment is selected from one or more of titanium dioxide, carbon black, molybdate, and chromate.

[0056] In some examples, the filler is selected from one or more of wollastonite, talc, light calcium carbonate, and barium sulfate.

[0057] In some examples, the dispersant is selected from one or more of modified polycarboxylate salts and modified organosiloxanes.

[0058] In some examples, the defoamer is selected from one or more of silicone defoamers and mineral oil defoamers.

[0059] The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating includes the following steps:

[0060] Preparation of Component A: Weigh each raw material according to the weight proportions, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry with a fineness of 20~50 μm, heat the mixed slurry at 40~80 ℃ for 1~2 h to obtain Component A;

[0061] Preparation of Component B: Mix fatty amine curing agent, modified amine curing agent and water evenly to obtain Component B;

[0062] Component A and component B are mixed evenly according to the mass ratio to obtain acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating.

[0063] In the following specific embodiments, unless otherwise specified, the pigment is titanium dioxide; the filler is wollastonite; the dispersant is modified polycarboxylate TH-2000; the defoamer is polydimethylsiloxane; the adhesion promoter is 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane; the mildew inhibitor is isothiazolinone; the fatty amine curing agent is hexamethylenediamine; and the initiator is benzoyl peroxide.

[0064] Example 1

[0065] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 50 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 7 parts of pigment, 25 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 10 parts of water.

[0066] Component B comprises: 50 parts of aliphatic amine curing agent, 7.5 parts of modified amine curing agent, and 42.5 parts of water;

[0067] The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin emulsion is as follows:

[0068] S1. 2 g of p-toluenesulfonic acid and 200 mL of polyether diol (the average molecular weight of the polyether diol is 1000, 2000, 4000, 6000, or 8000) were stirred and mixed in 40 mL of toluene for 1 h. Then, 10 g of gallic acid was added, and the mixture was heated to 105 °C and stirred for 5 h. Toluene was removed by vacuum distillation to obtain polyether diol gallic ester.

[0069] S2. Add 0.1 g hydroquinone and 1 g p-toluenesulfonic acid to 20 mL of toluene solvent, heat in an oil bath to 80 °C until completely dissolved, then add to 200 mL of polyether diol gallate and stir until homogeneous; under a nitrogen atmosphere, add 3.4 g acrylic acid to the reaction system, stir and react at 80 °C for 5 h, remove toluene by vacuum distillation to obtain acrylic polyether diol gallate.

[0070] S3. Dissolve 110 g of E51 epoxy resin in 200 mL of a blended solvent (the volume ratio of n-butanol and ethylene glycol monobutyl ether is 2:1), heat to 90 °C for pre-dissolution, and then add 1 g of initiator and 10 g of acrylic polyether diol gallate in sequence, and react at 110 °C for 3 h.

[0071] S4. Cool to 70 ℃, add a small amount of water and dimethylethanolamine to adjust the pH of the reaction system to 7, continue the reaction at 70 ℃ for 40 min, and disperse for 10 min at 10000 r / min using a high-speed disperser to obtain an acrylic polyether diol gallate grafted modified epoxy resin emulsion with a solid content of 47%.

[0072] The modified amine curing agent is prepared as follows:

[0073] 5 g of p-toluenesulfonic acid and 75 g of diethanolamine were mixed in 200 mL of toluene to obtain a mixed solution. Then, 50 g of 2,3-bisphenol benzoic acid was added to the mixed solution, and the mixture was heated to 120 °C and stirred for 12 h. After cooling to room temperature, a modified amine curing agent containing a phenolic hydroxyl structure was obtained.

[0074] The preparation method of the anti-corrosion coating is as follows:

[0075] (1) Preparation of component A: Weigh each raw material according to the weight parts, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry with a fineness of 20~50 μm, stir the mixed slurry at 1000 r / min for 1.5 h at 60 ℃ to obtain component A;

[0076] (2) Preparation of component B: Mix fatty amine curing agent, modified amine curing agent and water evenly to obtain component B;

[0077] (3) Mix component A and component B at a mass ratio of 7.5:1 to obtain acrylic polyether diol gallate grafted modified epoxy resin anti-corrosion coating.

[0078] Example 2

[0079] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 60 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 10 parts of pigment, 20 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 15 parts of water;

[0080] Component B comprises: 55 parts of aliphatic amine curing agent, 10 parts of modified amine curing agent, and 35 parts of water;

[0081] The preparation methods of the acrylic polyether diol gallate grafted modified epoxy resin emulsion, modified amine curing agent, and anti-corrosion coating in this embodiment are basically the same as those in Example 1. The difference is that in the preparation process of the anti-corrosion coating, component A and component B are mixed evenly at a mass ratio of 10:1 to obtain the acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating.

[0082] Example 3

[0083] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 40 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 5 parts of pigment, 40 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 5 parts of water;

[0084] Component B comprises: 45 parts of aliphatic amine curing agent, 5 parts of modified amine curing agent, and 50 parts of water;

[0085] The preparation methods of the acrylic polyether diol gallate grafted modified epoxy resin emulsion, modified amine curing agent, and anti-corrosion coating in this embodiment are basically the same as those in Example 1. The difference is that in the preparation process of the anti-corrosion coating, component A and component B are mixed evenly at a mass ratio of 5:1 to obtain the acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating.

[0086] Comparative Example 1

[0087] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 50 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 7.5 parts of pigment, 30 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 10 parts of water;

[0088] Component B comprises: 57.5 parts of aliphatic amine curing agent and 42.5 parts of water;

[0089] The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin emulsion described in this comparative example is the same as that in Example 1;

[0090] The preparation method of the anti-corrosion coating is as follows:

[0091] (1) Preparation of component A: Weigh each raw material according to the weight parts, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry with a fineness of 20~50 μm, stir the mixed slurry at 1000 r / min for 1.5 h at 60 ℃ to obtain component A;

[0092] (2) Preparation of component B: Mix fatty amine curing agent and water evenly to obtain component B;

[0093] (3) Mix component A and component B at a mass ratio of 7.5:1 to obtain acrylic polyether diol gallate grafted modified epoxy resin anti-corrosion coating.

[0094] Comparative Example 2

[0095] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 50 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 7.5 parts of pigment, 30 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 10 parts of water;

[0096] Component B comprises: 50 parts of aliphatic amine curing agent, 7.5 parts of modified amine curing agent, and 42.5 parts of water;

[0097] The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin emulsion described in this comparative example is the same as that in Example 1;

[0098] The preparation method of the modified amine curing agent is as follows:

[0099] p-Toluenesulfonic acid and diethanolamine were mixed in toluene to obtain a mixed solution. Then, 2,3-bisphenol benzoic acid was added to the mixed solution and mixed evenly to obtain a modified amine curing agent containing a phenolic hydroxyl structure.

[0100] The preparation method of the anti-corrosion coating is as follows:

[0101] (1) Preparation of component A: Weigh each raw material according to the weight parts, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry with a fineness of 20~50 μm, stir the mixed slurry at 1000 r / min for 1.5 h at 60 ℃ to obtain component A;

[0102] (2) Preparation of component B: Mix fatty amine curing agent and water evenly to obtain component B;

[0103] (3) Mix component A and component B at a mass ratio of 7.5:1 to obtain acrylic polyether diol gallate grafted modified epoxy resin anti-corrosion coating.

[0104] Comparative Example 3

[0105] A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted modified epoxy resin, comprising component A and component B; by weight, component A comprises: 50 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 7.5 parts of pigment, 30 parts of filler, 3 parts of dispersant, 3 parts of defoamer, 3 parts of adhesion promoter, 3 parts of mildew inhibitor, and 10 parts of water;

[0106] Component B comprises: 57.5 parts of modified amine curing agent and 42.5 parts of water;

[0107] The preparation methods of the acrylic polyether diol gallate grafted modified epoxy resin emulsion and the modified amine curing agent in this comparative example are the same as those in Example 1.

[0108] The preparation method of the anti-corrosion coating is as follows:

[0109] (1) Preparation of component A: Weigh each raw material according to the weight parts, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry with a fineness of 20~50 μm, stir the mixed slurry at 1000 r / min for 1.5 h at 60 ℃ to obtain component A;

[0110] (2) Preparation of component B: Mix the modified amine curing agent and water evenly to obtain component B;

[0111] (3) Mix component A and component B at a mass ratio of 7.5:1 to obtain acrylic polyether diol gallate grafted modified epoxy resin anti-corrosion coating.

[0112] Performance testing:

[0113] The hardness, adhesion, and salt spray resistance of the anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-3 were tested. The coating hardness was determined according to standard GB / T6739-2022; the bending performance was determined according to standard GB / T6742-2007; the rust adhesion was determined according to standard GB / T5210-2006; and the neutral salt spray resistance was determined according to standard GB / T1771-2007. The test results are shown in Table 1.

[0114] Table 1: Performance test results of the anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-3

[0115]

[0116] As shown in Table 1, the anti-corrosion coating prepared in Example 1 exhibits excellent performance. Specifically, when the average molecular weight of the polyether diol is 4000, the coating shows the highest hardness, adhesion, and salt spray resistance time. This indicates that the long-chain structure of the polyether diol has a significant impact on the coating's adhesion and anti-corrosion performance. Furthermore, the flexible long chains of the polyether diol and the polar gallic acid groups at the chain ends passivate rust, forming metal complexes that tightly bond with the rusted steel surface, inhibiting further corrosion. Conversely, excessively long or short flexible long chains of the polyether diol are detrimental to improving the coating's adhesion. The coatings prepared in Comparative Examples 1-3 all show inferior performance compared to the coating in Example 1, demonstrating that the performance of the coating can be significantly improved by using acrylic polyether diol gallate grafted modified epoxy resin emulsion, synergistically modified amine curing agents and aliphatic amine curing agents.

[0117] The above detailed embodiments describe the implementation of the present invention; however, the present invention is not limited to the specific details described in the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A rust-resistant and corrosion-resistant coating made of acrylic polyether diol gallate grafted with epoxy resin, characterized in that, The product comprises components A and B. By weight, component A comprises: 40-60 parts of acrylic polyether diol gallate grafted modified epoxy resin emulsion, 5-10 parts of pigment, 20-40 parts of filler, 2-4 parts of dispersant, 2-4 parts of defoamer, 2-4 parts of adhesion promoter, 2-4 parts of mildew inhibitor, and 5-15 parts of water; component B comprises: 45-55 parts of fatty amine curing agent, 5-10 parts of modified amine curing agent, and 35-50 parts of water. The mass ratio of component A to component B is (5~10):1; The structural formula of the acrylic polyether diol gallate grafted epoxy resin in the acrylic polyether diol gallate grafted epoxy resin emulsion is as follows: ； The modified amine curing agent is obtained by mixing and heating raw materials including p-toluenesulfonic acid, diethanolamine, and phenolic benzoic acid compounds; the mass ratio of p-toluenesulfonic acid, diethanolamine, and phenolic benzoic acid compounds is 1:15:

10.

2. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 1, characterized in that, The preparation method of the acrylic polyether diol gallate grafted modified epoxy resin emulsion includes the following steps: (1) Dissolve the epoxy resin in a blending solvent and heat it to 80~90 ℃ for pre-dissolution; (2) The initiator and polyether acrylic acid diol gallate are added sequentially to the solution in step (1), and the reaction is carried out at 100~120℃; (3) Cool down to 60~80 ℃ and adjust the pH of the reaction system to 6~8. Continue the reaction at 60~80 ℃ to obtain acrylic polyether diol gallate grafted modified epoxy resin emulsion.

3. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 1, characterized in that, The preparation method of the modified amine curing agent includes the following steps: p-Toluenesulfonic acid and diethanolamine are mixed in a solvent to obtain a mixed solution. Then, a phenolic benzoic acid compound is added to the mixed solution, and the temperature is raised to 100~120 °C to react. After cooling to room temperature, a modified amine curing agent containing a phenolic hydroxyl structure is obtained.

4. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 1, characterized in that, The preparation method of the acrylic polyether diol gallate is as follows: (1) Add hydroquinone and p-toluenesulfonic acid to the solvent, heat to dissolve, and then add to polyether diol gallate and mix well; (2) Add acrylic acid to the solution in step (1) and react at 75~85 °C to remove the solvent and obtain acrylic polyether diol gallate.

5. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 4, characterized in that, The preparation method of the polyether diol gallate is as follows: (1) Mix p-toluenesulfonic acid and polyether diol evenly in a solvent; (2) Add gallic acid to the solution in step (1) and heat to 100~110 °C to react and obtain polyether diol gallic acid ester.

6. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 5, characterized in that, The average molecular weight of the polyether diol is 1000~8000.

7. The acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 6, characterized in that, The average molecular weight of the polyether diol is 4000.

8. The method for preparing an acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Preparation of Component A: Weigh each raw material according to the weight proportions, mix the acrylic polyether diol gallate grafted modified epoxy resin emulsion and water evenly, then add pigment, filler, dispersant, defoamer, adhesion promoter and mildew inhibitor in sequence, mix and grind to obtain a mixed slurry, and heat the mixed slurry to obtain Component A. Preparation of Component B: Mix fatty amine curing agent, modified amine curing agent and water evenly to obtain Component B; Component A and component B are mixed evenly according to the mass ratio to obtain acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating.

9. The method for preparing an acrylic polyether diol gallate grafted modified epoxy resin rust-resistant anti-corrosion coating according to claim 8, characterized in that, The fineness of the mixed slurry is 20~50 μm.

Images