Long-acting salt-fog-resistant two-component epoxy zinc-rich primer and preparation method thereof

Abstract

The application discloses a long-acting salt-fog-resistant two-component epoxy zinc-rich primer and a preparation method thereof, and relates to the technical field of coating.The primer is prepared from component A and component B at a mass ratio of 9-11:1;the component A comprises the following components in parts by weight: 6-12 parts of liquid epoxy resin, 2-7 parts of solid epoxy resin, 0.1-0.4 parts of a dispersing agent, 1-3 parts of a thixotropic agent, 0.1-0.4 parts of a defoaming agent, 0.1-0.4 parts of a leveling agent, 70-80 parts of a rust-proof material, 5-12 parts of an organic mixed solvent and 1-3 parts of a resin diluent; and the component B comprises the following components in parts by weight: 60-70 parts of a curing agent, 30-40 parts of a curing agent diluent and 0.5-3 parts of a silane coupling agent.The polyacrylamide oxide is added to the epoxy zinc-rich primer, the primer has excellent adhesion and salt-fog resistance, and problems, such as large-area failure of a coating protection in the prior art, are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a long-lasting salt spray-resistant two-component epoxy zinc-rich primer and a preparation method thereof. Background Art

[0002] Zinc-rich epoxy coatings, with their excellent corrosion resistance, physical properties, and economic advantages, have become one of the most widely used and effective marine steel protection materials. Epoxy zinc-rich paint, prepared by adding ultrafine zinc powder to epoxy resin, exhibits cathodic protection. Zinc-rich primers with higher zinc content also have cathodic protection, providing electrochemical corrosion protection. The zinc salts produced by the reaction also act as a shield and retard corrosion. Epoxy zinc-rich primers also possess strong adhesion. The paint film of the epoxy zinc-rich primer has excellent adhesion to sandblasted steel surfaces, making it difficult to remove and maintaining a very strong adhesion. The coating is also weldable, allowing welding operations to proceed without affecting weld quality, and the coating will not be damaged by external interference from cutting or welding.

[0003] Zinc-rich epoxy paints contain a large amount of zinc powder, which can lead to the following drawbacks: Traditional zinc-rich epoxy coatings require a zinc content of at least 70 wt% to form an effective conductive path, thereby achieving cathodic protection and anti-corrosion effects. However, in practical applications, the formation of non-conductive oxidation products such as zinc oxide produced by corrosion damages the conductive path, resulting in cathodic protection failure, a significant decrease in anti-corrosion performance, waste of zinc resources, and environmental pollution. To overcome the shortcomings of traditional zinc-rich epoxies, the addition of functional conductive fillers such as nanoclays, nanozinc, polypyrrole, and graphene is considered a potential solution to extend the corrosion protection period. These conductive fillers enhance the conductivity between zinc particles, improving the cathodic protection performance of zinc-rich coatings even after localized zinc oxidation. However, during the drying process of zinc-rich epoxy coatings, vapor pores easily form between the filler particles and the resin. This interstitial layer is prone to cracking or collapse due to localized corrosion. This exposes the metal surface to the external corrosive environment. As a result, the corrosion protection of the zinc-rich coating fails over a large area. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a long-lasting salt spray-resistant two-component epoxy zinc-rich primer and a preparation method thereof. Polyacrylamide oxide is added to the epoxy zinc-rich primer, which has excellent adhesion and salt spray resistance, and effectively solves the problems of large-area failure of coating protection in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: providing a long-lasting salt spray resistant two-component epoxy zinc-rich primer, which is prepared from component A and component B in a mass ratio of 9-11:1;

[0006] The A component includes the following components by weight: liquid epoxy resin 6-12 parts, solid epoxy resin 2-7 parts, dispersing agent 0.1-0.4 parts, thixotropic agent 1-3 parts, defoaming agent 0.1-0.4 parts, leveling agent 0.1-0.4 parts, anti-rust material 70-80 parts, organic mixed solvent 5-12 parts, and resin diluent 1-3 parts.

[0007] The B component includes the following components by weight: curing agent 60-70 parts, curing agent diluent 30-40 parts, and silane coupling agent 0.5-3 parts.

[0008] Further, the mass ratio of the A component to the B component is 10:1.

[0009] Further, the A component includes the following components by weight: liquid epoxy resin 10 parts, solid epoxy resin 2 parts, dispersing agent 0.2 parts, thixotropic agent 2 parts, defoaming agent 0.1 parts, leveling agent 0.2 parts, anti-rust material 75 parts, organic mixed solvent 9 parts, and resin diluent 2 parts.

[0010] Further, the anti-rust material is a mixture of ordinary anti-rust material and anti-rust material additive in a mass ratio of 60-80:1-10.

[0011] Further, the ordinary anti-rust material is at least one of zinc powder, iron phosphate micro powder, iron-titanium micro powder, zinc oxide micro powder, and zinc phosphate micro powder.

[0012] Further, the anti-rust material additive is at least one of nano clay, polypyrrole nanosheet, graphene, and polyacrylamide oxide.

[0013] Further, the polyacrylamide oxide is prepared by the following method: acrylamide, methyl methacrylate, butyl acrylate, acryloyloxyethyl trimethyl ammonium chloride, glycidyl acrylate, ammonium persulfate, and propylene glycol are added to ethanol for reaction, after the reaction is completed, zinc chloride is added and stirred until the ethanol is completely volatilized, to obtain the polyacrylamide oxide.

[0014] Further, the mass-volume ratio of acrylamide, methyl methacrylate, butyl acrylate, acryloyloxyethyl trimethyl ammonium chloride, glycidyl acrylate, ammonium persulfate, propylene glycol, zinc chloride, and ethanol is 5-7g:10-14g:9-11g:0.1-0.5g:1-3g:0.1-0.3g:1-1.3g:30-40g:50-70mL.

[0015] Further, the mass-volume ratio of acrylamide, methyl methacrylate, butyl acrylate, acryloyloxyethyl trimethyl ammonium chloride, glycidyl acrylate, ammonium persulfate, propylene glycol, zinc chloride, and ethanol is 6g:12g:10g:0.3g:2g:0.2g:1.2g:35g:60mL.

[0016] Further, the rust-proof material is a mixture of zinc powder, iron phosphate powder and polyacrylamide oxide with a mass ratio of 32:41:2.

[0017] Further, the dispersant is BYK-A555, the defoaming agent is AKN-2350 and the leveling agent is BYK-354.

[0018] Further, the liquid epoxy resin is E44 and the solid epoxy resin is E20.

[0019] Further, the thixotropic agent is a mixture of organic bentonite, dehydrocastor oil and montmorillonite with a mass ratio of 1:1:1-3.

[0020] Further, the thixotropic agent is a mixture of organic bentonite, dehydrocastor oil and montmorillonite with a mass ratio of 1:1:2.

[0021] Further, the organic mixed solvent is a mixed solvent of diethylene glycol dibutyl ether, dipropylene glycol methyl ether and dibutyl glyceryl ether with a mass ratio of 1-3:2-3:2-3.

[0022] Further, the resin diluent is at least one of an alcohol solvent, an ether solvent, a ketone solvent and an aromatic hydrocarbon solvent.

[0023] Further, the B component comprises the following components by weight: 65 parts of a curing agent, 34 parts of a curing agent diluent and 1 part of a silane coupling agent.

[0024] Further, the curing agent is a mixture of a small molecule polyamide curing agent and an aliphatic amine curing agent with a mass ratio of 1-3:1.

[0025] Further, the curing agent is a mixture of a small molecule polyamide curing agent and an aliphatic amine curing agent with a mass ratio of 2:1.

[0026] Further, the curing agent diluent is at least one of an aromatic hydrocarbon solvent, an alcohol solvent, an ether solvent and a ketone solvent.

[0027] Further, the silane coupling agent is one of vinyltrimethoxysilane, vinyltri(beta-methoxyethoxy)silane, vinyltriethoxysilane, gamma-aminopropyltrimethoxysilane and gamma-methacryloyloxypropyltrimethoxysilane.

[0028] The application also provides a preparation method of the long-acting salt-fog-resistant two-component epoxy zinc-rich primer.

[0029] (1) liquid epoxy resin, solid epoxy resin, dispersing agent, thixotropic agent, defoaming agent, leveling agent, organic mixed solvent and resin diluent are stirred at 700-900 r / min for 20-40 min, ground to obtain a slurry; then rust-proofing material is added to the slurry, and stirred at 700-900 r / min for 20-40 min to obtain component A;

[0030] (2) curing agent, curing agent diluent and silane coupling agent are stirred at 300-500 r / min for 20-40 min, filtered to obtain component B;

[0031] (3) the component A obtained in step (1) and the component B obtained in step (2) are mixed to obtain a long-acting salt-fog-resistant two-component epoxy zinc-rich primer.

[0032] The present application has the following beneficial effects:

[0033] 1. The two-component epoxy zinc-rich primer of the present application uses polyacrylamide oxide with conductivity, which can be uniformly dispersed in the epoxy zinc-rich paint to improve the overall conductivity of the coating, can easily expand to form a network structure in the coating, effectively reduces the sedimentation of zinc powder, and can support the strength of the epoxy resin to prevent the collapse of the coating caused by zinc corrosion during the corrosion process.

[0034] 2. The polyacrylamide oxide improves the conductivity of the rust-proofing material, reduces the production of non-conductive zinc oxide during the corrosion process, and reduces the corrosion resistance; it also forms a network structure to improve the flexibility of the coating, reduces the pores between the filler particles and the resin during the drying process, thereby reducing the rupture or collapse caused by local corrosion, and exposing the metal surface to the external corrosion environment.

[0035] 3. In the present application, organic bentonite and montmorillonite are used in the thixotropic agent, and the addition of the two has a synergistic effect, which can increase the viscosity of the primer and form a network film and a three-dimensional network structure on the surface of the rust-proofing material particles to support and prevent particle sedimentation, improve the density of the bottom coating, and even when the coating is thick, it will not shrink and crack.

[0036] 4. The present application uses a combination of solid resin and liquid resin, which is beneficial to adjusting the hardness and anti-sticking of the primer. DETAILED DESCRIPTION

[0037] The principles and characteristics of the present application are described below, and the examples are only used to explain the present application and are not used to limit the scope of the present application. If the specific conditions are not specified in the examples, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0038] Example 1

[0039] A long-lasting salt spray-resistant two-component epoxy zinc-rich primer, made from component A and component B in a mass ratio of 10:1;

[0040] Component A includes the following components by weight: 10 parts of liquid epoxy resin, 2 parts of solid epoxy resin, 0.2 parts of dispersant, 2 parts of thixotropic agent, 0.1 parts of defoaming agent, 0.2 parts of leveling agent, 75 parts of rust-proof material, 9 parts of organic mixed solvent and 2 parts of resin diluent;

[0041] Component B includes the following components in parts by weight: 65 parts of curing agent, 34 parts of curing agent diluent and 1 part of silane coupling agent.

[0042] The dispersant is BYK-A555, the defoamer is Qianyou Chemical AKN-2350, and the leveling agent is BYK-354. The liquid epoxy resin is E44, and the solid epoxy resin is E20. The thixotropic agent is a mixture of organic bentonite, dehydrogenated castor oil, and montmorillonite in a mass ratio of 1:1:2. The organic mixed solvent is a mixture of diethylene glycol dibutyl ether, dipropylene glycol methyl ether, and dibutyl glycidyl ether in a mass ratio of 1:3:2. The resin diluent is n-butanol.

[0043] The rust preventive material is a mixture of zinc powder, iron phosphate powder, and polyacrylamide oxide in a mass ratio of 32:41:2. The polyacrylamide oxide is prepared by the following method: 6g of acrylamide, 12g of methyl methacrylate, 10g of butyl acrylate, 3g of acryloyloxyethyltrimethylammonium chloride, 2g of glycidyl acrylate, 0.2g of ammonium persulfate, and 1.2g of propylene glycol are added to 60mL of ethanol for reaction. After the reaction, 35g of zinc chloride is added and stirred until the ethanol is completely evaporated to obtain the polyacrylamide oxide.

[0044] The curing agent is a mixture of a small molecule polyamide curing agent and an aliphatic amine curing agent in a mass ratio of 2:1. The curing agent diluent is a mixture of diethylene glycol dibutyl ether, dipropylene glycol methyl ether, and dibutyl glycol glycidyl ether in a mass ratio of 1:3:2. The silane coupling agent is γ-aminopropyltrimethoxysilane.

[0045] The preparation method of the above-mentioned long-lasting salt spray resistant two-component epoxy zinc-rich primer comprises the following steps:

[0046] (1) stirring liquid epoxy resin, solid epoxy resin, dispersant, thixotropic agent, defoamer, leveling agent, organic mixed solvent and resin diluent at 800 r / min for 30 min, grinding to obtain slurry; then adding rust preventive material to the slurry, stirring at 800 r / min for 30 min, to obtain component A;

[0047] (2) stirring the curing agent, curing agent diluent and silane coupling agent at 400 r / min for 30 min, filtering and obtaining component B;

[0048] (3) Component A obtained in step (1) and component B obtained in step (2) are mixed to obtain a long-lasting salt spray-resistant two-component epoxy zinc-rich primer.

[0049] Example 2

[0050] A long-lasting salt spray-resistant two-component epoxy zinc-rich primer, made from component A and component B in a mass ratio of 9-11:1;

[0051] Component A includes the following components by weight: 6 parts of liquid epoxy resin, 2 parts of solid epoxy resin, 0.1 parts of dispersant, 1 part of thixotropic agent, 0.1 parts of defoaming agent, 0.1 parts of leveling agent, 70 parts of rust-proof material, 5 parts of organic mixed solvent and 1 part of resin diluent;

[0052] Component B includes the following components in parts by weight: 60 parts of a curing agent, 30 parts of a curing agent diluent, and 0.5 parts of a silane coupling agent.

[0053] The dispersant is BYK-A555, the defoamer is Qianyou Chemical AKN-2350, and the leveling agent is BYK-354. The liquid epoxy resin is E44, and the solid epoxy resin is E20. The thixotropic agent is a mixture of organic bentonite, dehydrogenated castor oil, and montmorillonite in a mass ratio of 1:1:2. The organic mixed solvent is a mixture of diethylene glycol dibutyl ether, dipropylene glycol methyl ether, and dibutyl glycidyl ether in a mass ratio of 1:3:2. The resin diluent is n-butanol.

[0054] The rust preventive material is a mixture of zinc powder, iron phosphate powder, and polyacrylamide oxide in a mass ratio of 32:41:2. The polyacrylamide oxide is prepared by the following method: 6g of acrylamide, 12g of methyl methacrylate, 10g of butyl acrylate, 3g of acryloyloxyethyltrimethylammonium chloride, 2g of glycidyl acrylate, 0.2g of ammonium persulfate, and 1.2g of propylene glycol are added to 60mL of ethanol for reaction. After the reaction, 35g of zinc chloride is added and stirred until the ethanol is completely evaporated to obtain the polyacrylamide oxide.

[0055] The curing agent is a mixture of a small molecule polyamide curing agent and an aliphatic amine curing agent in a mass ratio of 2:1. The curing agent diluent is a mixture of diethylene glycol dibutyl ether, dipropylene glycol methyl ether, and dibutyl glycidyl ether in a mass ratio of 1:3:2. The silane coupling agent is gamma-aminopropyltrimethoxysilane.

[0056] The preparation method of the above-mentioned long-lasting salt spray resistant two-component epoxy zinc-rich primer comprises the following steps:

[0057] (1) Liquid epoxy resin, solid epoxy resin, dispersant, thixotropic agent, defoaming agent, leveling agent, organic mixed solvent and resin diluent were stirred at 800 r / min for 30 min, ground to obtain a slurry; then rust-proof material was added to the slurry, and stirred at 800 r / min for 30 min to obtain component A;

[0058] (2) The curing agent, curing agent diluent and silane coupling agent were stirred at 400 r / min for 30 min, and filtered to obtain component B;

[0059] (3) The component A obtained in step (1) and the component B obtained in step (2) were mixed to obtain a long-acting salt spray resistant two-component epoxy zinc-rich primer.

[0060] Example 3

[0061] A long-acting salt spray resistant two-component epoxy zinc-rich primer was prepared from component A and component B at a mass ratio of 9-11:1.

[0062] The component A comprises the following components by weight: liquid epoxy resin 12 parts, solid epoxy resin 7 parts, dispersant 0.4 parts, thixotropic agent 3 parts, defoaming agent 0.4 parts, leveling agent 0.4 parts, rust-proof material 80 parts, organic mixed solvent 12 parts and resin diluent 3 parts.

[0063] The component B comprises the following components by weight: curing agent 70 parts, curing agent diluent 40 parts and silane coupling agent 3 parts.

[0064] The dispersant is BYK-A555, the defoaming agent is Qianyou Chemical AKN-2350, and the leveling agent is BYK-354; the liquid epoxy resin is E44, the solid epoxy resin is E20, the thixotropic agent is a mixture of organic bentonite, dehydrocastor oil and montmorillonite at a mass ratio of 1:1:2. The organic mixed solvent is a mixed solvent of diethylene glycol dibutyl ether, dipropylene glycol methyl ether and dibutyl glycidyl ether at a mass ratio of 1:3:2. The resin diluent is n-butanol.

[0065] The rust-proof material is a mixture of zinc powder, iron phosphate powder and polyacrylamide oxide at a mass ratio of 32:41:2. The polyacrylamide oxide is prepared by the following method: 6 g of acrylamide, 12 g of methyl methacrylate, 10 g of butyl acrylate, 3 g of acryloyloxyethyl trimethyl ammonium chloride, 2 g of glycidyl acrylate, 0.2 g of ammonium persulfate and 1.2 g of propylene glycol are added to 60 mL of ethanol and reacted. After the reaction is completed, 35 g of zinc chloride is added and stirred until the ethanol is completely volatilized to obtain polyacrylamide oxide.

[0066] The curing agent is a mixture of a small molecule polyamide curing agent and an aliphatic amine curing agent in a mass ratio of 2:1. The curing agent diluent is a mixture of diethylene glycol dibutyl ether, dipropylene glycol methyl ether, and dibutyl glycidyl ether in a mass ratio of 1:3:2. The silane coupling agent is vinyl triethoxysilane.

[0067] The preparation method of the above-mentioned long-lasting salt spray resistant two-component epoxy zinc-rich primer comprises the following steps:

[0068] (1) stirring liquid epoxy resin, solid epoxy resin, dispersant, thixotropic agent, defoamer, leveling agent, organic mixed solvent and resin diluent at 800 r / min for 30 min, grinding to obtain slurry; then adding rust preventive material to the slurry, stirring at 800 r / min for 30 min, to obtain component A;

[0069] (2) stirring the curing agent, curing agent diluent and silane coupling agent at 400 r / min for 30 min, filtering and obtaining component B;

[0070] (3) Component A obtained in step (1) and component B obtained in step (2) are mixed to obtain a long-lasting salt spray-resistant two-component epoxy zinc-rich primer.

[0071] Comparative Example 1

[0072] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain polyacrylamide oxide, and the rust-proof material is a mixture of zinc powder, iron phosphate powder and nanoclay in a mass ratio of 32:41:2.

[0073] Comparative Example 2

[0074] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain polyacrylamide oxide, and the rust-proof material is a mixture of zinc powder, iron phosphate powder and polypyrrole nanosheets in a mass ratio of 32:41:2.

[0075] Comparative Example 3

[0076] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not contain polyacrylamide oxide, and the rust-proof material is a mixture of zinc powder, iron phosphate powder and graphene in a mass ratio of 32:41:2.

[0077] Comparative Example 4

[0078] The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 does not contain polyacrylamide oxide, and the rust-proof material is a mixture of zinc powder and iron phosphate powder in a mass ratio of 34:41.

[0079] Test example

[0080] The primers obtained in Example 1 and Comparative Examples 1-4 were applied to the surface of a tinplate and allowed to air dry at room temperature. The coatings had a thickness of 30±3 μm. A copper salt-accelerated acetate salt spray test was conducted at 50°C±2°C for 96 hours in accordance with "GB / T 10125 Artificial Atmosphere Corrosion Test," and the films were observed for surface defects. While the surface appearance of the paint films of Examples 1-3 remained essentially unchanged, the paint films of Comparative Examples 1-3 exhibited blisters, spots, and shedding. The paint film of Comparative Example 4 exhibited dense blisters and shedding.

[0081] The primers obtained in Example 1 and Comparative Examples 1-4 were applied to the surface of the tinplate by brushing and dried at room temperature. The thickness of the coating was 20±3 μm. Performance tests were carried out in accordance with the provisions of GB / T3668 2009 Zinc-rich Primer. The results are shown in Table 1.

[0082] The performance test method is carried out according to the following standards:

[0083] Adhesion is tested according to GB5210 2006 “Adhesion test for paints and varnishes by pull-off method”;

[0084] Flexibility is measured according to GB1731 1993 "Determination of paint film flexibility";

[0085] Impact resistance is carried out according to GB / T1732-1993 "Impact resistance of paint films";

[0086] The salt spray resistance is tested according to GB1771 2007 “Determination of neutral salt spray resistance of paints and varnishes”.

[0087] Table 1 Performance test results statistics

[0088]

[0089]

[0090] The primers obtained in Example 1 and Comparative Examples 1 to 4 were applied to the surface of the corroded hot-rolled plate substrate by brushing and dried at room temperature. The thickness of the coating film was 90±10 μm. Performance tests were carried out in accordance with the provisions of "GB / T3668 2009 Zinc-rich Primer". The results are shown in Table 2.

[0091] Each performance test is carried out in the following manner:

[0092] Adhesion is tested in accordance with GB9268 1998 "Cross-cut test for paint and varnish films";

[0093] The salt spray resistance is carried out in accordance with GB1771 2007 “Determination of resistance of paints and varnishes to neutral salt spray”.

[0094] Table 2 Performance test results

[0095] project Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Blank example Adhesion, grade 0 0 0 1 1 Salt spray resistance h 962 866 900 924 515

[0096] As can be seen from Table 1-2, the polyacrylamide oxide added to the long-lasting salt spray resistant two-component epoxy zinc-rich primer of the present invention improves the adhesion and flexibility of the epoxy zinc-rich paint, and also highlights excellent performance in long-term corrosion protection, which is better than the currently common anti-rust additives.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A long-lasting salt spray resistant two-component epoxy zinc-rich primer, characterized in that: Made of component A and component B in a mass ratio of 9-11:1; The component A is made of the following components by weight: 6-12 parts of liquid epoxy resin, 2-7 parts of solid epoxy resin, 0.1-0.4 parts of dispersant, 1-3 parts of thixotropic agent, 0.1-0.4 parts of defoaming agent, 0.1-0.4 parts of leveling agent, 70-80 parts of rust-proof material, 5-12 parts of organic mixed solvent and 1-3 parts of resin diluent; The B component is made of the following components by weight: 60-70 parts of curing agent, 30-40 parts of curing agent diluent and 0.5-3 parts of silane coupling agent; The rust-proof material is a mixture of zinc powder, iron phosphate powder and polyacrylamide oxide in a mass ratio of 32:41:

2. The polyacrylamide oxide is prepared by the following method: acrylamide, methyl methacrylate, butyl acrylate, acryloyloxyethyltrimethylammonium chloride, glycidyl acrylate, ammonium persulfate and propylene glycol are added to ethanol for reaction, and zinc chloride is added after the reaction is completed and stirred until the ethanol is completely volatilized to obtain the polyacrylamide oxide.

2. The long-lasting salt spray resistant two-component epoxy zinc-rich primer according to claim 1, characterized in that: The mass ratio of component A to component B is 10:

1.

3. The long-lasting salt spray resistant two-component epoxy zinc-rich primer according to claim 1, characterized in that: The component A is made of the following components in parts by weight: 10 parts of liquid epoxy resin, 2 parts of solid epoxy resin, 0.2 parts of dispersant, 2 parts of thixotropic agent, 0.1 parts of defoaming agent, 0.2 parts of leveling agent, 75 parts of rust-proof material, 9 parts of organic mixed solvent and 2 parts of resin diluent.

4. The long-lasting salt spray resistant two-component epoxy zinc-rich primer according to claim 1, characterized in that: The mass volume ratio of acrylamide, methyl methacrylate, butyl acrylate, acryloyloxyethyltrimethylammonium chloride, glycidyl acrylate, ammonium persulfate, propylene glycol, zinc chloride and ethanol is 6g:12g:10g:3g:2g:0.2g:1.2g:35g:60mL.

5. The long-lasting salt spray resistant two-component epoxy zinc-rich primer according to claim 1, characterized in that: The B component is made of the following components in parts by weight: 65 parts of curing agent, 34 parts of curing agent diluent and 1 part of silane coupling agent.

6. The method for preparing the long-lasting salt spray resistant two-component epoxy zinc-rich primer according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Stir liquid epoxy resin, solid epoxy resin, dispersant, thixotropic agent, defoaming agent, leveling agent, organic mixed solvent and resin diluent at 700-900 r / min for 20-40 min, grind to obtain slurry; then add rust preventive material to the slurry, stir at 700-900 r / min for 20-40 min, and obtain component A; (2) Stir the curing agent, curing agent diluent and silane coupling agent at 300-500 r / min for 20-40 min, filter and obtain component B; (3) Component A obtained in step (1) and component B obtained in step (2) are mixed to obtain a long-lasting salt spray-resistant two-component epoxy zinc-rich primer.

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