CN108624196B - Water-based epoxy precoated primer and preparation method thereof - Google Patents
Water-based epoxy precoated primer and preparation method thereof Download PDFInfo
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- CN108624196B CN108624196B CN201711084934.8A CN201711084934A CN108624196B CN 108624196 B CN108624196 B CN 108624196B CN 201711084934 A CN201711084934 A CN 201711084934A CN 108624196 B CN108624196 B CN 108624196B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention provides a water-based epoxy precoating primer and a preparation method thereof. The primer film has high curing speed, and the surface is dried within 5min at room temperature without baking; the early hardness is high, and the hardness can reach HB after 12 hours; and the paint has good heat-resistant stability, low VOC content and excellent corrosion resistance, and can replace solvent-based waterborne epoxy precoated primer for early corrosion prevention of railway wagons.
Description
Technical Field
The invention relates to the field of coatings, in particular to a water-based epoxy pre-coating primer and a preparation method thereof.
Background
At present, the Volatile Organic Compound (VOC) content of the solvent type epoxy precoating primer used for the railway freight car all the time is 500-850 g/L, a large amount of organic solvent is volatilized during construction, so that serious harm is brought to the environment and human health, and potential safety hazards are buried in the production, storage and transportation construction links. And because the corrosion resistance is not high, the salt spray resistance is not higher than 48h generally, and the steel is corroded after being sprayed with the epoxy precoating primer for 9 months. With the improvement of the environmental protection requirement of the coating industry and the anti-corrosion requirement of the railway wagon, the development of the water-based coating with low VOC content and good anti-corrosion performance becomes a development trend of the anti-corrosion coating of the railway wagon.
Chinese patent CN201610887251.5 discloses a water-based self-curing environment-friendly water-based shop primer. The formula of the coating comprises two components of a base material and a curing agent, wherein the base material comprises zinc powder, ferrophosphorus powder and a filler, and the curing agent comprises lithium potassium silicate and modified emulsion. The water-based workshop primer improves the flexibility and the adhesive force of a paint film, reduces VOC (volatile organic compounds), reduces the content of zinc powder and reduces the harm of zinc fume during welding.
Chinese patent CN201610270947.3 provides a paint film strengthening agent which has the advantages of paint film strengthening performance, corrosion resistance and weldability improvement, and zinc fog and weld pores generated by cutting and welding are reduced. The primer comprises 40-90% of zinc, 10-60% of mica iron oxide, 5-11 parts of water-soluble alkali metal silicate and 0-3 parts of an auxiliary agent.
Chinese patent CN201510253623.4 provides a highly corrosion-resistant water-based shop primer, which comprises the following components in percentage by weight: 38-100% of potassium silicate with the modulus not less than 5, 20-30% of zinc powder, 40-60% of ferrophosphorus powder, 2-5% of mica powder, 1-10% of kaolin, 2-10% of ferric oxide, 2-10% of cellulose and 20-30% of wollastonite powder. The water-based workshop primer has good environmental protection, does not generate volatile organic compounds, and has good adhesive force, weather resistance and strong corrosion and rust resistance.
However, in the prior art, the water-based epoxy pre-coating primer has the defects of slow drying time and low early hardness (the hardness of a paint film is lower than HB at 23 ℃ for 24 hours), and the primer can be stacked after being sprayed for 3-4 hours, so that the construction progress is delayed, and the inconvenience is brought to coating construction.
Disclosure of Invention
The invention aims to provide a water-based epoxy precoated primer which is quick to dry, high in early hardness and excellent in corrosion resistance, so as to comprehensively replace a solvent-based epoxy precoated primer to be used on a railway wagon, and also provides a preparation method of the water-based epoxy precoated primer.
The invention provides a room temperature (greater than or equal to about 5 ℃) quick-drying water-based epoxy precoated primer, which takes water-based epoxy ester resin and water-soluble acrylate resin as base materials, is added with a plurality of anti-rust pigments and auxiliary agents, is cured into a film at room temperature, and has low VOC content and excellent anti-corrosion performance; the water-based epoxy ester resin is combined with the water-soluble acrylate resin, so that the advantage of excellent corrosion resistance of the water-based epoxy ester resin is exerted, the characteristic of quick drying of the water-soluble acrylate resin is combined, the prepared water-based epoxy precoating primer has excellent corrosion resistance, and the quick drying can meet the requirements of field construction processes, and can be used for replacing a solvent-based epoxy precoating primer.
The specific technical scheme of the invention is as follows:
the water-based epoxy pre-coating primer comprises the following components in parts by weight:
preferably, the waterborne epoxy ester resin has a viscosity of 25-35S (Grignard), an acid value of 9-18 mgKOH/g, and synthetic monomers comprising: linoleic acid, dehydrated ricinoleic acid, E-20 or E-12 epoxy resin, synthesized by esterification and other processes, preferably one or more of WAP 5812, YG-EP001, AQ 340.
Preferably, the pH regulator is one or more of N, N-dimethylethanolamine, ammonia water and MA-95.
Preferably, the water-based water-soluble acrylate resin is a fast-drying water-based resin, has a viscosity of Z2-Z6 (Gardner at25 ℃), and comprises the following synthetic monomers: one or more of methacrylic acid, methyl methacrylate, butyl acrylate, butyl methacrylate, polyethylene glycol (600) diacrylate, (3) ethoxylated trimethylolpropane triacrylate and isooctyl methacrylate (initiator such as azobisisobutyronitrile is used) are synthesized by solution polymerization, preferably one or two of AC823G and AWR-2512-60.
Preferably, the antirust pigment is one or more of iron oxide red, zinc phosphate, aluminum tripolyphosphate, water-based nano phosphate, water-based zinc phosphomolybdate, organic modified zinc aluminum molybdenum orthophosphate and strontium chromate, preferably one or more of water-based nano phosphate, water-based zinc phosphomolybdate, zinc phosphate and strontium chromate, and further preferably comprises the zinc phosphate and the water-based zinc phosphomolybdate in a weight ratio of 4: 0.5-1.
Preferably, the defoamer is a silicone defoamer or a fluorine modified siloxane defoamer, preferably one or more of a DF40 defoamer, a 941PL defoamer, a Tego902W defoamer.
Preferably, the flash etching agent is one or more of Raybo 60, Raybo 75, Raybo 80 and FA 179, preferably FA 179.
Preferably, the substrate wetting agent is a polyether siloxane copolymer, preferably one or more of the wetting agents Tego510, Tego4100, WET 270.
Preferably, the anti-settling thixotropic agent is one or more of bentonite LT, BYK-420, PUR-62, fumed silica and RM-8W.
Preferably, the dispersant is polyacrylate and/or polycarboxylate, preferably one or more of polyacrylate sodium salt, polycarboxylate ammonium salt and polyacrylate ammonium salt.
In a second aspect of the present invention, there is provided a method for preparing the above waterborne epoxy pre-coat primer, comprising the steps of:
(1) sequentially putting the water-based epoxy ester resin, the water-soluble acrylate resin, the deionized water, the pH regulator, the dispersant and the anti-rust pigment into a dispersing tank according to the formula amount, uniformly dispersing, and grinding until the fineness is less than or equal to 60 micrometers, preferably less than or equal to 50 micrometers, and further preferably less than or equal to 40 micrometers;
(2) adding the defoaming agent, the flash corrosion agent, the base material wetting agent and the anti-settling thixotropic agent into the mixture obtained in the step a), uniformly stirring and filtering, adjusting the viscosity of the mixture to be more than or equal to 2.0 Pa.S, preferably 4-10 Pa.S, filtering to remove impurities, inspecting and packaging.
The invention has the beneficial effects that:
(1) the invention adopts quick-drying water-based epoxy ester resin and water-soluble acrylate resin, and adds various antirust pigments and water-based additives to prepare the water-based paint with quick drying and excellent corrosion resistance.
(2) The coating film of the paint has high curing speed, and the surface is dried within 5min at room temperature without baking.
(3) The early hardness of the coating film of the paint is high, and the hardness can reach HB after 12 hours; and the heat-resistant stability is good, and the VOC content is low.
(4) The paint can replace solvent type epoxy precoated primer for early corrosion prevention of railway wagons and steel structures.
Detailed Description
For a further understanding of the present invention, reference will now be made to the preferred embodiments of the present invention, which are illustrated in the following examples, which are intended to describe various aspects of the present invention, and which are, unless otherwise specified, commercially available as starting materials; or prepared according to conventional methods in the art. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is to be understood that such description is merely illustrative of the features and advantages of the present invention, and is not intended to limit the scope of the claims.
Unless otherwise indicated, the test methods for paint performance in this application use test methods commonly used in the paint art.
The invention provides a water-based epoxy pre-coating primer, which comprises the following components in parts by weight:
20 to 40 portions of water-based epoxy ester resin, 3 to 12 portions of water-based acrylic resin, 0.1 to 5 portions of pH regulator, 0.1 to 4 portions of base material wetting agent, 1 to 8 portions of dispersant, 5 to 100 portions of antirust pigment, 0.1 to 3 portions of defoaming agent, 0.2 to 5 portions of anti-flash agent, 0.5 to 5 portions of anti-settling thixotropic agent and 50 to 140 portions of deionized water.
The base material of the paint is water-based epoxy ester resin or water-soluble acrylate resin.
The waterborne epoxy ester resin has the advantages of large average relative molecular weight, quick drying, strong adhesion of a coating film to metal, excellent water resistance, alkali resistance and chemical corrosion resistance, toughness in coating and strong impact resistance. Preferably one or two or more of WAP 5812, YG-EP001, AQ 340.
The water-soluble acrylate resin has the advantages of quick drying, good water dilutability, strong adhesion of a coating film to metal, good wettability and dispersibility to pigments and fillers, and excellent water resistance, alcohol resistance and chemical corrosion resistance. One or two of AC823G and AWR-2512-60 are preferred.
The antirust pigment preferably comprises zinc phosphate and water-based zinc phosphomolybdate in a weight ratio of 4: 0.5-4, preferably 4:0.5-1, and can also comprise iron oxide red and the like. After the zinc phosphate is compounded and modified with zinc and molybdenum, the electrochemical antirust performance of the pigment is improved, and the compatibility of the pigment and a coating, the shielding effect of the coating and the adhesive force of the coating and a base material are improved. The organic modified aluminum molybdenum zinc orthophosphate has short time for forming an effective protective film, is beneficial to preventing the coating from rusting and bubbling, wherein the zinc content is 38-40.5 percent, the aluminum content is about 4.0 percent, and a small amount of molybdenum can be compounded with other pigments for use, thereby effectively enhancing the chemical adsorption capacity, preventing the corrosion of the metal surface and providing a hydrophobic layer for preventing the water vapor erosion, and further improving the water resistance and the corrosion resistance of the coating.
Preferably, the coating contains 5 to 15% of a rust-preventive pigment based on the total weight.
The flash rust inhibitor or flash corrosion inhibitor is a polar substance, can be adsorbed on the surface of a metal substrate, and is arranged between a coating and a metal to form a monomolecular film, so that the chemical adsorption capacity of the surface of steel is effectively enhanced, flash rust on the surface of the metal in the self-drying process of a paint film is prevented, and the early water resistance and the salt spray resistance can be improved. Such as one or two or more of Raybo 60, Raybo 75, Raybo 80, FA 179.
Preferably, the coating contains 0.5-1% of corrosion inhibitor based on the total weight.
The waterborne epoxy pre-coating primer is prevented from generating bubbles in the production and construction processes, and a defoaming agent is required to be added in the production process. The defoamer should have the following characteristics: 1. the surface tension of the defoaming agent is less than the surface tension of the liquid needing defoaming; 2. solubility in the paint is as low as possible; 3. good dispersibility; 4. strong diffusion force is required; 5. the performance of the finished water-based paint cannot be influenced; 6. safe and environment-friendly. The defoaming agent in the invention is preferably a silicone defoaming agent or a fluorine modified siloxane defoaming agent, and is preferably one or two or more of DF40 defoaming agent, 941PL defoaming agent and Tego902W defoaming agent.
Preferably, the coating material contains 0.5-1% of defoaming agent based on the total weight.
The substrate wetting agent can help the coating to wet various substrate surfaces, reduce the surface tension of the water-based paint, and prevent surface defects such as shrinkage cavities or shrinkage edges and the like, thereby improving the paint film adhesion and the corrosion resistance. The substrate wetting agent in the invention is polyether siloxane copolymer, and preferably one or two or more wetting agents Tego510, Tego4100 and WET 270.
Preferably, the coating contains 0.3 to 0.5 percent of substrate wetting agent by total weight.
The dispersant is polyacrylate and/or polycarboxylate, preferably one or two or more of polyacrylate sodium salt, polycarboxylate ammonium salt and polyacrylate ammonium salt; they are characterized by that on the surface of pigment and filler a strong adsorption or anchoring action is produced, and said invented product possesses longer molecular chain to form steric hindrance, and its chain end possesses water-solubility, and some also are equipped with electrostatic repulsion so as to obtain stable result. The waterborne polyurethane coating has a good dispersing effect, can reduce the viscosity of the coating, improves the storage stability of the coating, and increases the gloss and the leveling property, such as one or two or more of Tego760W, Tego752W and BYK190 of Degussa.
Preferably, the coating contains 0.5 to 1.5 percent of dispersant based on the total weight.
The invention also includes an anti-settling thixotropic agent. After the anti-settling thixotropic agent is added into the water-based epoxy pre-coating primer, the viscosity of the paint is temporarily reduced when the paint is subjected to shearing force (such as stirring or brushing), and the paint gradually recovers to the original viscosity when the paint is not subjected to the shearing force. This feature prevents the pigment from settling during storage of the paint, and improves workability. The anti-settling thixotropic agent used in the invention is preferably one or two or more of bentonite LT, BYK-420, PUR-62, fumed silica and RM-8W.
Preferably, the coating material contains 0.2 to 0.5 percent of anti-settling thixotropic agent based on the total weight.
The invention also provides a preparation method of the waterborne epoxy pre-coating primer, which comprises the following steps:
(1) sequentially putting the water-based epoxy ester resin, the water-soluble acrylate resin, the deionized water, the pH regulator, the dispersant and the anti-rust pigment into a dispersing tank according to the formula amount, uniformly dispersing, and grinding until the fineness is less than or equal to 60 micrometers, preferably less than or equal to 50 micrometers, and further preferably less than or equal to 40 micrometers;
(2) adding the defoaming agent, the flash corrosion agent, the base material wetting agent and the anti-settling thixotropic agent into the mixture obtained in the step a), uniformly stirring and filtering, adjusting the viscosity of the mixture to be more than or equal to 2.0 Pa.S, preferably 4-10 Pa.S, filtering to remove impurities, inspecting and packaging.
The invention also provides the application of the water-based epoxy pre-coating primer or the water-based paint prepared by the preparation method as the early-stage anticorrosion primer of a steel structure, in particular as the early-stage anticorrosion primer of a wagon body. Other aspects of the invention will be apparent to those skilled in the art in view of the disclosure herein.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer. All percentages are by weight unless otherwise indicated, the molecular weight of the polymer is number average molecular weight, and the solvents used are technical grade.
Example 1:
weighing 32Kg of sunlight Virginia AQ340 waterborne epoxy ester resin, 8Kg of AWR-2512-60 water-soluble acrylate resin of Shenzhen Jiashenda, 110Kg of deionized water, MA-953 Kg of PH regulator, 5Kg of Tego752W dispersant of Degussa company, 2.5Kg of BYK420 (Pico chemical) anti-settling thixotropic agent, 25Kg of iron oxide red, 30Kg of zinc phosphate, 25Kg of waterborne phosphomolybdate, dispersing for 15-20 min at 1500r/min, and then grinding until the fineness is less than or equal to 40 mu m; then adding 1.5Kg of defoaming agent Degussa Tego902W, 602.5 Kg of flash rust inhibitor Raybo of American Rebao company, 1.2Kg of WET270 base material wetting agent of Degussa company, 2Kg of PUR-62 anti-settling thixotropic agent, dispersing at 1500r/min for 15-20 min, filtering and packaging.
Example 2:
weighing 28Kg of sunlight Virginia AQ340 waterborne epoxy ester resin, 10Kg of AWR-2512-60 water-soluble acrylate resin of Shenzhen Jiashenda, 100Kg of deionized water, MA-952 Kg of pH regulator, 4Kg of Tego752W dispersant of Degussa company, 1.5Kg of BYK420 (Pico chemical) anti-settling thixotropic agent, 20Kg of iron oxide red, 40Kg of zinc phosphate, 10Kg of waterborne phosphomolybdate zinc, dispersing for 15-20 min at 1500r/min, and then grinding until the fineness is less than or equal to 40 mu m; then adding 1Kg of defoaming agent of Texo 902W of Degussa, 602.5 Kg of flash rust inhibitor Raybo of Rebao company of America, 1.5Kg of wetting agent of WET270 base material of Degussa, 2.5Kg of PUR-62 anti-settling thixotropic agent, dispersing at 1500r/min for 15-20 min, filtering and packaging.
Comparative example 1 (coating commonly used in the art):
the base material water-based epoxy ester resin and the water-based soluble acrylate resin are replaced by a certain domestic water-based epoxy ester resin (different from the base material of the invention), and the rest components and contents of the components of the water-based epoxy precoating primer are as follows:
weighing 40Kg of common waterborne epoxy ester resin (manufacturer: Dubo new material Co., Ltd., Zhou province) produced in a country, 110Kg of deionized water, MA-953 Kg of PH regulator, 5Kg of Tego752W dispersant of Degussa, 2.5Kg of BYK420 (Pico chemical) anti-settling thixotropic agent, 25Kg of iron oxide red, 30Kg of zinc phosphate, 25Kg of waterborne phosphomolybdic acid zinc, dispersing for 15-20 min at 1500r/min, and then grinding until the fineness is less than or equal to 40 mu m; then adding 1.5Kg of defoaming agent Degussa Tego902W, 602.5 Kg of flash rust inhibitor Raybo of American Rebao company, 1.2Kg of WET270 base material wetting agent of Degussa company, 2Kg of PUR-62 anti-settling thixotropic agent, dispersing at 1500r/min for 15-20 min, filtering and packaging.
Comparative example 2
The procedure was carried out in analogy to example 1, except that no water-soluble acrylate resin was used, the amount of the aqueous epoxy ester resin being 40 Kg.
Comparative example 3
The procedure was carried out in analogy to example 1, except that the aqueous epoxy ester resin was not used and the amount of the water-soluble acrylate resin was 40 Kg.
Comparative example 4
The procedure was carried out analogously to example 1, except that 20Kg of the waterborne epoxy ester resin and 20Kg of the water-soluble acrylate resin were used.
The waterborne shop primers prepared in example 1 and comparative examples 1 to 4 were sprayed on steel plate samples and then tested, and the data are shown in table 1:
TABLE 1 Primary Performance test results for waterborne shop primers
Compared with the coating prepared from the waterborne epoxy ester resin produced in a country in the comparative example 1 and the coatings prepared in the comparative examples 2 to 4, the waterborne precoating primer disclosed by the invention has the advantages of high drying speed, good corrosion resistance, good heat-resistant stability, excellent adhesive force and low VOC (volatile organic compound) content.
The coating of the invention is particularly suitable for the early corrosion prevention of steel structures, in particular wagon bodies.
The water-based shop primer and the preparation method thereof provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A water-based epoxy precoated primer is characterized in that: the primer comprises the following components in parts by weight:
the antirust pigment comprises zinc phosphate and water-based zinc phosphomolybdate in a weight ratio of 4: 0.5-4;
the water-based epoxy ester resin is quick-drying water-based epoxy ester resin, and the water-soluble acrylate resin is quick-drying water-based resin;
the viscosity of the latticed tube of the water-based epoxy ester resin is 25-35S, the acid value is 9-18 mgKOH/g, and the synthetic monomer comprises: linoleic acid, dehydrated ricinoleic acid, E-20 epoxy resin or E-12 epoxy resin;
the water-soluble acrylate resin has a Gardner viscosity of Z2-Z6 at25 ℃, and the synthetic monomer comprises: one or more of methacrylic acid, methyl methacrylate, butyl acrylate, butyl methacrylate, polyethylene glycol (600) diacrylate, ethoxylated trimethylolpropane triacrylate and isooctyl methacrylate, by solution polymerization.
2. The waterborne epoxy shop primer according to claim 1, characterized in that: the primer comprises the following components in parts by weight:
3. the waterborne epoxy shop primer according to claim 1 or 2, characterized in that: the rust-preventive pigment further comprises iron oxide red.
4. The waterborne epoxy shop primer according to claim 1 or 2, characterized in that: the pH regulator is one or two of N, N-dimethylethanolamine and ammonia water;
the defoaming agent is an organic silicon defoaming agent or a fluorine modified siloxane defoaming agent;
the substrate wetting agent is a polyether siloxane copolymer;
the dispersant is polyacrylate and/or polycarboxylate.
5. A method of making the waterborne epoxy shop primer of any one of claims 1-4, the method comprising the steps of:
(1) sequentially putting the water-based epoxy ester resin, the water-soluble acrylate resin, the pH regulator, the deionized water, the base material wetting agent, the dispersing agent and the anti-rust pigment into a dispersing tank according to the formula amount, uniformly dispersing, and grinding until the fineness is less than or equal to 60 mu m;
(2) adding the defoaming agent, the anti-flash agent and the anti-settling thixotropic agent into the mixture obtained in the step (1), uniformly stirring and filtering, adjusting the viscosity of the mixture to be more than or equal to 4.0 Pa.S, filtering to remove impurities, inspecting and packaging.
6. Use of the waterborne epoxy shop primer according to any one of claims 1-4 or the primer prepared by the method according to claim 5 as early corrosion protection primer for steel structures.
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