A high-volume solids water-based epoxy zinc-rich primer and its preparation method

Abstract

This invention discloses a high-volume solids water-based epoxy zinc-rich primer and its preparation method. The raw materials and their weight proportions are as follows: 10-20 parts water-soluble modified epoxy resin, 0.5-1 part dispersant, 0.1-0.5 parts defoamer, 5-15 parts co-solvent, 3-8 parts amphiphilic polysiloxane hollow microspheres, 40-70 parts zinc powder, 1-5 parts rheology modifier, 5-20 parts rust-inhibiting filler, and 5-15 parts amine curing agent. The amphiphilic polysiloxane hollow microspheres have a D50 of 300-500 μm and a wall thickness of 20 μm. The product of this invention can effectively improve the coating rate and construction efficiency, has good adhesion, a short drying time, and exhibits an impact resistance of over 50 g / cm and a salt spray resistance of over 2000 hours.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coatings technology, and in particular to a high-volume solids water-based epoxy zinc-rich primer and its preparation method. Background Technology

[0002] Waterborne epoxy zinc-rich coatings are a widely used green, high-performance anti-corrosion coating in recent years. They can replace solvent-based epoxy zinc-rich coatings and hot-dip galvanizing, achieving the same anti-corrosion effect at room temperature while avoiding the high pollution and energy consumption associated with these methods. However, waterborne epoxy zinc-rich coatings also have some drawbacks. Their higher density results in a lower volume solids content. For projects requiring thicker primer films, multiple coats are needed, leading to reduced efficiency and increased energy consumption. Secondly, some manufacturers increase the volume solids content by adding low-density inorganic fillers. However, due to the low resin content, the excess inorganic fillers cannot fully coat the coating, resulting in reduced anti-corrosion performance and insufficient flexibility, ultimately affecting the anti-corrosion lifespan compared to hot-dip galvanizing and solvent-based epoxy zinc-rich coatings. Summary of the Invention

[0003] To address the issue that existing waterborne epoxy zinc-rich coating primers have low volume solids content and require multiple coats to achieve the designed film thickness, this invention provides a high-volume-solids-content waterborne epoxy zinc-rich primer and its preparation method.

[0004] The technical solution of the present invention is as follows:

[0005] The first objective of this invention is to provide a high-volume solids water-based epoxy zinc-rich primer, wherein the raw materials contained therein and the weight parts of each raw material are as follows:

[0006] The ingredients are: 10-20 parts water-soluble modified epoxy resin, 0.5-1 part dispersant, 0.1-0.5 parts defoamer, 5-15 parts cosolvent, 3-8 parts amphiphilic polysiloxane hollow microspheres, 40-70 parts zinc powder, 1-5 parts rheology modifier, 5-20 parts rust-inhibiting filler, and 5-15 parts epoxy curing agent.

[0007] The amphiphilic polysiloxane hollow microspheres have a D50 of 300-500 μm and a wall thickness of 20 μm.

[0008] In one embodiment of the present invention, the method for preparing amphiphilic polysiloxane hollow microspheres is as follows:

[0009] Mix the pH adjuster, sodium dodecyl sulfonate, and water thoroughly to form an aqueous phase;

[0010] Vinylsiloxane, vinyl monomer, initiator, and hexadecyl alcohol are mixed evenly to form an oil phase;

[0011] The oil phase was added dropwise to the aqueous phase, followed by ultrasonic emulsification, centrifugal washing with water, washing with anhydrous ethanol, and vacuum drying to obtain the amphiphilic polysiloxane hollow microspheres.

[0012] In one embodiment of the present invention, the pH adjuster is one or more of sodium hydroxide, sodium bicarbonate, sodium carbonate, sodium phosphate, sodium dihydrogen phosphate, and potassium hydrogen phosphate.

[0013] In one embodiment of the present invention, the vinylsiloxane is one or more of silane KH-570, vinyltriethoxysilane, and methacryloxypropyltriethoxysilane.

[0014] In one embodiment of the present invention, the vinyl monomer is one or more of methyl methacrylate, styrene, and acrylonitrile.

[0015] In one embodiment of the present invention, the initiator is one or more of azobisisobutyronitrile, benzoyl peroxide, and azobisisoheptanenitrile.

[0016] In one embodiment of the present invention, the method for preparing amphiphilic polysiloxane hollow microspheres is as follows:

[0017] NaHCO3, NaH2PO4, sodium dodecyl sulfonate and water are mixed evenly to form an aqueous phase;

[0018] Silane KH-570, methyl methacrylate, azobisisobutyronitrile, and hexadecyl alcohol are mixed evenly to form an oil phase;

[0019] The oil phase was added dropwise to the aqueous phase, followed by ultrasonic emulsification, centrifugal washing with water, washing with anhydrous ethanol, and vacuum drying to obtain the amphiphilic polysiloxane hollow microspheres.

[0020] In one embodiment of the present invention, the method for preparing amphiphilic polysiloxane hollow microspheres is as follows:

[0021] 0.1 parts NaHCO3, 0.1 parts NaH2PO4, 0.1 parts sodium dodecyl sulfonate and 89 parts water were added to a flask and mixed to form an aqueous phase; 10 parts of silane KH-570 mixed in a certain mass ratio were mixed with methyl methacrylate, 0.1 parts azobisisobutyronitrile and 0.4 parts hexadecyl alcohol to form an oil phase.

[0022] The oil phase was added dropwise to the aqueous phase in a flask, and after coarse emulsification by stirring for 0.5 h, it was subjected to ultrasonic fine emulsification (10 min, 25 °C). Polymerization was carried out at 75 °C for 6 h to obtain an emulsion, which was then centrifuged and washed with water to obtain polysiloxane hollow microsphere powder. The polysiloxane hollow microsphere powder was washed with anhydrous ethanol and vacuum dried at 60-75 °C to obtain white powdery amphiphilic polysiloxane hollow microspheres.

[0023] In one embodiment of the present invention, the ultrasonic emulsification conditions are: ultrasonic treatment at 50000Hz for 10 minutes at 25±5℃.

[0024] In one embodiment of the present invention, the water-soluble modified epoxy resin is a water-soluble polyurethane modified epoxy resin with a glass transition temperature of 70-80°C and a molecular weight of 30,000-80,000.

[0025] In one embodiment of the present invention, the dispersant is an aqueous nonionic polyurethane dispersant.

[0026] In one embodiment of the present invention, the defoamer is a polyether-based defoamer.

[0027] In one embodiment of the present invention, the co-solvent is at least two of propylene glycol methyl ether, diethylene glycol butyl ether, isopropanol, propylene glycol methyl ether acetate, and 12-ol ester.

[0028] In one embodiment of the present invention, the rheology modifier is one or more of bentonite, polyamide wax, polyethylene wax, and fumed silica.

[0029] In one embodiment of the present invention, the rust-preventive filler is one or more of the following: iron-titanium powder, aluminum tripolyphosphate, zinc phosphate, silicon micro powder, mica iron oxide, and iron phosphate powder.

[0030] In one embodiment of the present invention, the epoxy curing agent is one or more of aliphatic amines, cycloaliphatic amines, aromatic amines, and polyamide epoxy curing agents.

[0031] A second objective of this invention is to provide a method for preparing the above-mentioned high-volume solids water-based epoxy zinc-rich primer, comprising the following steps:

[0032] (1) Add 10-20 parts of water-soluble modified epoxy resin to 80% cosolvent, add 1-5 parts of rheology modifier at 600-800 rpm, stir for 5-10 min, and then continue stirring at 1000-1500 rpm for 30-60 min to fully activate it.

[0033] (2) Add 0.5-1 part of dispersant to the product after treatment in step (1), then add the remaining 20% ​​of cosolvent, then add 40-70 parts of zinc powder and 5-20 parts of rust-preventive filler in sequence, stir at 800-1000 rpm until the particle size in the mixture is less than 65 μm, and finally add 3-8 parts of amphiphilic polysiloxane hollow microspheres and stir until uniform, as the main agent of high volume solid water-based epoxy zinc-rich primer;

[0034] (3) Take 5-15 parts of epoxy curing agent and mix them evenly with the above-mentioned waterborne epoxy zinc-rich primer to obtain a high volume solids waterborne epoxy zinc-rich primer.

[0035] The beneficial technical effects of this invention are as follows:

[0036] The hollow polysiloxane microspheres in this invention have a low density due to their hollow structure. When added to water-based zinc-rich epoxy resins, they can effectively reduce the specific gravity of the coating and increase its volumetric solids content. Secondly, their synthesis is simple and readily available, the particle size is adjustable, and their structure exhibits amphiphilicity. During the coating dispersion stage, their oleophilicity helps them integrate well into water-soluble systems and ensures storage stability. During the paint formulation stage, their hydrophilicity enhances the emulsification of the coating and facilitates dilution with water. The low particle size allows the hollow polysiloxane microspheres to be well encapsulated by resin and fill gaps in the coating film. When the coating film is under stress, the hollow structure absorbs stress, enhancing the toughness and strength of the coating film and improving its crack resistance.

[0037] This invention uses water-soluble polyurethane modified epoxy resin as a base, which forms a strong bond with the substrate to be protected and zinc powder. The coating has a short drying time, and the resulting film has an adhesion of more than 5 MPa, an impact resistance of more than 50 g / cm, a water resistance of more than 4000 h, a salt water resistance of more than 3000 h, a damp heat resistance of more than 2000 h, and a salt spray resistance of more than 10000 h. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the preparation process of amphiphilic polysiloxane hollow microspheres. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] In this embodiment of the invention, water-soluble polyurethane-modified epoxy resin of type 330 with an epoxy equivalent of 600-700 was purchased from LianGu New Materials Technology Co., Ltd.

[0041] The dispersant was water-based nonionic polyurethane dispersant 7456F, purchased from Guangzhou Sloco New Materials Co., Ltd.

[0042] The co-solvent is obtained by mixing diethylene glycol butyl ether and propylene glycol methyl ether in a mass ratio of 1:1.

[0043] The zinc powder is 800 mesh, with a total zinc content of 99.9% and a metallic zinc content of over 98%. The particle size is ≤40μm. It was purchased from Hunan Xinweiling Metal New Material Technology Co., Ltd.

[0044] The epoxy curing agent is polyamide curing agent 772, with an active hydrogen equivalent of 150 and a viscosity of 8000-18000 mPas, purchased from LianGu New Materials Technology Co., Ltd.

[0045] Figure 1 This is a schematic diagram of the preparation process of amphiphilic polysiloxane hollow microspheres. The groups on the surface of the polysiloxane hollow microspheres in the figure are silanol groups (Si-OH) or siloxy groups (Si-OCH3).

[0046] Example 1

[0047] A method for preparing amphiphilic polysiloxane hollow microspheres includes the following steps:

[0048] 0.1 parts sodium bicarbonate, 0.1 parts sodium dihydrogen phosphate, 0.1 parts sodium dodecyl sulfonate, and 89 parts water were added to a flask. Then, 7 parts silane KH-570, 3 parts methyl methacrylate, 0.1 parts azobisisobutyronitrile, and 0.4 parts hexadecyl alcohol were mixed evenly. The mixture was then added dropwise to the flask. After coarse emulsification by stirring for 0.5 h, ultrasonic fine emulsification was performed (10 min, 25 °C). Polymerization was carried out at 75 °C for 6 h to obtain an emulsion. After centrifugation and washing with water, polysiloxane hollow microsphere powder was obtained. The polysiloxane hollow microsphere powder was washed with anhydrous ethanol and vacuum dried at 75 °C to obtain white powdered polysiloxane hollow microspheres.

[0049] Example 2

[0050] 0.1 parts sodium bicarbonate, 0.1 parts sodium dihydrogen phosphate, 0.1 parts sodium dodecyl sulfonate, and 87 parts water were added to a flask. Then, 6 parts vinyltriethoxysilane, 6 parts styrene, 0.1 parts azobisisobutyronitrile, and 0.4 parts hexadecyl alcohol were mixed evenly. The mixture was then added dropwise to the flask. After coarse emulsification by stirring for 0.5 h, ultrasonic fine emulsification was performed (10 min, 25 °C). Polymerization was carried out at 75 °C for 6 h to obtain an emulsion. After centrifugation and washing with water, polysiloxane hollow microsphere powder was obtained. The polysiloxane hollow microsphere powder was washed with anhydrous ethanol and vacuum dried at 60 °C to obtain white powdered polysiloxane hollow microspheres.

[0051] Example 3

[0052] 0.1 parts sodium bicarbonate, 0.1 parts sodium dihydrogen phosphate, 0.1 parts sodium dodecyl sulfonate, and 88 parts water were added to a flask. Then, 4 parts silane KH-570, 7 parts acrylonitrile, 0.1 parts benzoyl peroxide, and 0.6 parts hexadecyl alcohol were mixed evenly. The mixture was then added dropwise to the flask. After coarse emulsification by stirring for 0.5 h, ultrasonic fine emulsification was performed (10 min, 25 °C). Polymerization was carried out at 75 °C for 6 h to obtain an emulsion. After centrifugation and washing with water, polysiloxane hollow microsphere powder was obtained. The polysiloxane hollow microsphere powder was washed with anhydrous ethanol and vacuum dried at 70 °C to obtain white powdered polysiloxane hollow microspheres.

[0053] Example 4

[0054] 0.1 parts sodium bicarbonate, 0.1 parts potassium hydrogen phosphate, 0.1 parts sodium dodecyl sulfonate, and 88 parts water were added to a flask. Then, 9 parts of methacryloxypropyltriethoxysilane, 2 parts styrene, 0.1 parts azobisisobutyronitrile, and 0.6 parts hexadecyl alcohol were mixed evenly. The mixture was then added dropwise to the flask. After coarse emulsification by stirring for 0.5 h, ultrasonic fine emulsification was performed (10 min, 25 °C). Polymerization was carried out at 75 °C for 6 h to obtain an emulsion. After centrifugation and washing with water, polysiloxane hollow microsphere powder was obtained. The polysiloxane hollow microsphere powder was washed with anhydrous ethanol and vacuum dried at 75 °C to obtain white powdered polysiloxane hollow microspheres.

[0055] Example 5

[0056] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 4.5 parts polysiloxane hollow microspheres, 63 parts zinc powder, 2.5 parts rheology modifier, 10 parts rust-inhibiting filler, and 10 parts epoxy curing agent;

[0057] The preparation method includes the following steps:

[0058] (1) Weigh each component according to the mass fractions;

[0059] (2) Take 5.5 parts of cosolvent, add 13 parts of epoxy resin to the cosolvent and stir at 600 r / min for 20 min. After mixing evenly, add 2.5 parts of rheology modifier while stirring and continue stirring to fully activate.

[0060] (3) Add 0.5 parts of dispersant to step (2), stir and add the remaining 1 part of cosolvent, then add 63 parts of zinc powder, 6 parts of iron-titanium powder and 4 parts of aluminum tripolyphosphate in sequence to accelerate stirring until the particle size in the mixture is less than 65 μm, and finally add polysiloxane hollow microspheres to obtain the high volume solid water-containing epoxy zinc-rich primer component A.

[0061] (4) Take 10 parts of epoxy curing agent to make component B of high volume solid water-based epoxy zinc-rich primer. Mix component A and component B evenly to obtain high volume solid water-based epoxy zinc-rich primer.

[0062] Example 6

[0063] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 18 parts of water-soluble polyurethane modified epoxy resin, 0.5 parts of dispersant, 1.5 parts of co-solvent, 6 parts of polysiloxane hollow microspheres, 63 parts of zinc powder, 2.5 parts of rheology modifier, 8 parts of rust-inhibiting filler, and 10 parts of epoxy curing agent.

[0064] The preparation method is the same as in Example 5.

[0065] Example 7

[0066] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 10 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 8.5 parts co-solvent, 9 parts polysiloxane hollow microspheres, 63 parts zinc powder, 2.5 parts rheology modifier, 8.5 parts rust-inhibiting filler, and 10 parts epoxy curing agent;

[0067] The preparation method is the same as in Example 5.

[0068] Example 8

[0069] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 10 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 4.5 parts cosolvent, 10 parts polysiloxane hollow microspheres, 70 parts zinc powder, 2.5 parts rheology modifier, 2.5 parts rust-inhibiting filler, and 10 parts amine curing agent;

[0070] The preparation method is the same as in Example 5.

[0071] Comparative Example 1

[0072] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 63 parts zinc powder, 2.5 parts rheology modifier, 14.5 parts rust-inhibiting filler, and 10 parts epoxy curing agent.

[0073] The preparation method is the same as in Example 5.

[0074] Comparative Example 2

[0075] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 4.5 parts commercially available hydrophilic hollow glass microspheres, 63 parts zinc powder, 2.5 parts rheology modifier, 10 parts rust-inhibiting filler, and 10 parts epoxy curing agent;

[0076] The preparation method is the same as in Example 5.

[0077] Comparative Example 3

[0078] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble polyurethane modified epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 4.5 parts commercially available oleophilic hollow glass microspheres, 63 parts zinc powder, 2.5 parts rheology modifier, 10 parts rust-inhibiting filler, and 10 parts epoxy curing agent;

[0079] The preparation method is the same as in Example 5.

[0080] Comparative Example 4

[0081] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 4.5 parts polysiloxane hollow microspheres, 63 parts zinc powder, 2.5 parts rheology modifier, 10 parts rust-inhibiting filler, and 10 parts epoxy curing agent.

[0082] The preparation method is the same as in Example 5.

[0083] Comparative Example 5

[0084] A high-volume solids water-based epoxy zinc-rich primer comprises the following components by weight: 13 parts water-soluble epoxy resin, 0.5 parts dispersant, 6.5 parts co-solvent, 63 parts zinc powder, 2.5 parts rheology modifier, 14.5 parts rust-inhibiting filler, and 10 parts epoxy curing agent;

[0085] The preparation method is the same as in Example 5.

[0086] The performance of the high volume solids water-based epoxy zinc-rich primers obtained in Example 5 and Comparative Examples 1-4 was tested, and the results are shown in Table 1.

[0087] Table 1

[0088]

[0089] As shown in Table 1, the high-volume-solids waterborne epoxy zinc-rich primer prepared by the method of this invention in Example 5 exhibits excellent adhesion and a volume solids content exceeding 70%, thus improving the coating coverage and construction efficiency. Furthermore, the addition of amphiphilic polysiloxane hollow microspheres ensures both the storage stability of the coating and good workability, with salt spray resistance exceeding 2000 hours. It also demonstrates excellent anti-corrosion properties.

[0090] In Comparative Example 1, without the addition of polysiloxane hollow microspheres, the coating had a higher specific gravity and a volume solids content of only 49%, requiring nearly 30% more construction time for the same film thickness. Furthermore, due to the lack of hollow microspheres in the system, the shrinkage stress of the epoxy system during film formation could not be fully released, resulting in poor impact resistance and thick-film crack resistance.

[0091] Comparative Example 2 used commercially available hydrophilic hollow glass microspheres, which also had a significant effect on reducing specific gravity and increasing volumetric solids content. However, due to the large particle size of the hollow glass microspheres, the resin could not completely coat the powder under the same addition amount, resulting in a certain decrease in anti-corrosion performance. On the other hand, since the main paint is a water-soluble system, the hydrophilic microspheres alone have poor compatibility with the system, resulting in poor storage stability and precipitation after one week of hot storage.

[0092] Comparative Example 3 uses commercially available oleophilic hollow glass microspheres, which have good compatibility in water-soluble systems. However, due to the need to dilute with water during construction, the compatibility is poor, the viscosity is too high, and the atomization of airless spraying is poor.

[0093] In Comparative Example 4, ordinary waterborne epoxy resin was used. However, the flexibility and corrosion resistance of ordinary epoxy resin are significantly inferior to those of polyurethane-modified epoxy resin.

[0094] In Comparative Example 5, no polysiloxane hollow microspheres or water-soluble polyurethane modified epoxy resin were added, resulting in a volume solids content of less than 50%. This significantly reduced the construction efficiency, and the water resistance and salt spray resistance of the coating were noticeably reduced, making the coating prone to cracking.

[0095] The embodiments provided above are not intended to limit the scope of the invention, nor are the described steps intended to limit the order of execution. Any obvious modifications made to the invention by those skilled in the art based on existing common knowledge also fall within the scope of protection defined by the claims.

Claims

1. A high-build water reducible epoxy zinc-rich primer, characterized in that, The weight parts of the raw materials and each raw material are as follows: The water-soluble modified epoxy resin 10-20 parts, dispersant 0.5-1 part, defoaming agent 0.1-0.5 part, cosolvent 5-15 parts, amphiphilic polysiloxane hollow microspheres 3-8 parts, zinc powder 40-70 parts, rheological additive 1-5 parts, anti-rust filler 5-20 parts and epoxy curing agent 5-15 parts; The specification of the amphiphilic polysiloxane hollow microspheres is D50=300-500 μm, and the wall thickness is 20 μm; The preparation method of the amphiphilic polysiloxane hollow microspheres is as follows: The pH regulator, sodium dodecyl sulfonate and water are mixed uniformly to form an aqueous phase; The vinyl siloxane, vinyl monomer, initiator and cetyl alcohol are mixed uniformly to form an oil phase; the vinyl siloxane is one or more of silane KH-570, vinyl triethoxysilane and methyl methacryloyloxypropyl triethoxysilane; the vinyl monomer is one or more of methyl methacrylate, styrene and acrylonitrile; The oil phase is added dropwise into the aqueous phase, and the amphiphilic polysiloxane hollow microspheres are prepared by ultrasonic fine emulsification, polymerization, centrifugal water washing, anhydrous ethanol washing and vacuum drying; The water-soluble modified epoxy resin is a water-soluble polyurethane modified epoxy resin, the glass transition temperature thereof is 70-80 ℃, and the molecular weight thereof is 3-80 thousand.

2. The high-build water reducible epoxy zinc-rich primer according to claim 1, characterized in that, The pH regulator is one or more of sodium hydroxide, sodium bicarbonate, sodium carbonate, sodium phosphate, sodium dihydrogen phosphate and potassium hydrogen phosphate; the initiator is one or more of azobisisobutyronitrile, benzoyl peroxide and azobisisoheptyl nitrile.

3. The high-build water reducible epoxy zinc-rich primer according to claim 1, characterized in that, The ultrasonic fine emulsification conditions are as follows: ultrasonic treatment at 50000 Hz for 10 min at 25±5 ℃.

4. The high-build water reducible epoxy zinc-rich primer of claim 1, wherein, The dispersant is a water-based non-ionic polyurethane dispersant; the defoaming agent is a polyether defoaming agent; and the cosolvent is at least two of propylene glycol methyl ether, diethylene glycol butyl ether, isopropyl alcohol, propylene glycol methyl ether acetate and alcohol ester twelve.

5. The high-build water reducible epoxy zinc-rich primer of claim 1, wherein, The rheological additive is one or more of bentonite, polyamide wax, polyethylene wax and fumed silica.

6. The high-build water reducible epoxy zinc-rich primer of claim 1, wherein, The anti-rust filler is one or more of iron-titanium powder, aluminum tripolyphosphate, zinc phosphate, silicon powder, mica iron oxide and phosphorus iron powder.

7. The high-build water reducible epoxy zinc-rich primer of claim 1, wherein, The epoxy curing agent is one or more of aliphatic amine, alicyclic amine, aromatic amine and polyamide epoxy curing agent.

8. A process for the preparation of the high-build water reducible epoxy zinc rich primer of claim 1, characterized by, The method comprises the following steps: (1) 10-20 parts of the water-soluble modified epoxy resin are added into 80% of the cosolvent, 1-5 parts of the rheological additive are added at a speed of 600-800 rpm, stirring is carried out for 5-10 min, then 1000-1500 rpm stirring is continued for 30-60 min to fully activate; (2) 0.5-1 part of the dispersant is added into the product after step (1), the remaining 20% of the cosolvent is added, then 40-70 parts of the zinc powder and 5-20 parts of the anti-rust filler are sequentially added, stirring is carried out at a speed of 800-1000 rpm until the particle size in the mixed solution is less than 65 μm, finally 3-8 parts of the amphiphilic polysiloxane hollow microspheres are added and stirred until uniform, thereby obtaining the high-volume solid water-based epoxy zinc-rich primer main agent. (3) 5-15 parts of the epoxy curing agent is taken and mixed with the above waterborne epoxy zinc-rich primer main agent uniformly, and a high volume solid waterborne epoxy zinc-rich primer is obtained.

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