CN111040570B - Water-based epoxy primer-topcoat integrated paint for stainless steel substrate and preparation method thereof - Google Patents
Water-based epoxy primer-topcoat integrated paint for stainless steel substrate and preparation method thereof Download PDFInfo
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- CN111040570B CN111040570B CN201911263380.7A CN201911263380A CN111040570B CN 111040570 B CN111040570 B CN 111040570B CN 201911263380 A CN201911263380 A CN 201911263380A CN 111040570 B CN111040570 B CN 111040570B
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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
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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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention provides a water-based epoxy primer-topcoat in one paint for stainless steel substrates and a preparation method thereof, the water-based epoxy primer-topcoat in one paint comprises a component A and a component B, wherein the raw materials of the component A comprise, by weight, 30-40% of a medium-high molecular weight water-based epoxy emulsion, 4-8% of a medium-low molecular weight water-based epoxy emulsion, 0.5-1% of a dispersing agent, 0-1% of a wetting agent, 0.5-1% of an antifoaming agent, 0.5-1.5% of an anti-flash rust agent, 34-41% of a pigment and filler, 18-25% of water, 0.5-1% of an adhesion promoter and 0.5-1.5% of a thickening agent; the raw material of the component B consists of 30 to 40 percent of water, 10 to 20 percent of film forming additive and curing agent by weight. According to the invention, two water-based epoxy emulsions with epoxy equivalent weights of 450-750 g/Eq and 200-300 g/Eq are matched, so that the adhesive force between the coating and the base material is greatly improved, the coating can be firmly attached to the surface of the stainless steel base material, the stainless steel base material is isolated from corrosive factors in the environment, and the chemical corrosion resistance of the stainless steel base material is improved.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to water-based epoxy primer-topcoat paint for a stainless steel substrate and a preparation method thereof.
Background
The chromium content of the stainless steel is at least 11-12 percent (mass fraction), and a layer of dense inert chromium oxide (Cr) is formed on the surface of the stainless steel under the condition of oxygen2O3) A surface layer, which lends itself to slight corrosion resistance. In a relatively mild environment, the coating composition can be used without surface coating. However, in a severe environment, such as a high-temperature and humid environment where urban rail vehicles (e.g., subways) are located, a high-chlorine environment where indoor swimming pools and equipment thereof are located, and under the conditions that cutting, bending and pickling passivation of stainless steel sections are incomplete, the stainless steel base material is easily corroded, so that it is necessary to perform coating protection on the stainless steel.
Common stainless steel coating methods include an anodic oxidation method, a metal coating method, a corrosion inhibitor adding method and the like, and although the methods are industrially applied, the methods have the defects of complex process, high cost, serious pollution and the like, and do not meet the requirements of energy conservation and environmental protection. Therefore, the development of a novel, efficient, green and environment-friendly stainless steel protective coating has direct practical significance.
The water paint (water paint) is a material formed by adding resin and various auxiliary agents into water serving as a dispersion medium, has the advantages of environmental protection, simple and efficient construction and the like, and is gradually used for the surface anticorrosion coating of the stainless steel substrate. For example, the Chinese patent application with the publication number of CN109777241A utilizes water-based hydroxy acrylic resin and amino resin to prepare water-based acrylic amino baking red paint which can be used for coating stainless steel, has excellent adhesion on a stainless steel base material, and also has excellent performances such as hardness, impact resistance, flexibility and the like, but the corrosion resistance of the product is poor, and the salt spray resistance time is only 300 hours. The Chinese patent application with the publication number of CN109535880A uses aqueous acrylic emulsion, aqueous polyurethane emulsion and other aqueous resins to prepare an aqueous metal industrial coating which can be used for coating various metal substrates such as iron, aluminum, stainless steel and the like. However, the film forming substance system of the product is quite complex, and various resin systems such as aqueous acrylic emulsion, aqueous polyurethane emulsion, aqueous amino resin, aqueous polyester resin and the like are compounded, so that the problems of resin compatibility and the like are easy to occur. The Chinese patent application with publication number CN108912952A uses liquid petroleum resin and epoxy resin emulsion to make a direct red water epoxy heavy-duty anti-corrosive primer, although the anti-corrosive effect is excellent, the primer is only suitable for steel with relatively large roughness, the adhesion force on the surface of a stainless steel substrate with compact and smooth surface is extremely poor, and the primer is easy to depaint, so that the corrosion of water vapor, chloride ions and the like to the stainless steel substrate can not be effectively isolated.
Disclosure of Invention
The invention aims to solve the problem of low adhesive force of the existing water-based epoxy resin coating on the surface of a stainless steel substrate, and provides a water-based epoxy primer-topcoat paint for the stainless steel substrate and a preparation method thereof.
The invention provides a water-based epoxy primer-topcoat paint for a stainless steel substrate, which comprises a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
30 to 40 percent of water;
10 to 20 percent of film forming auxiliary agent;
the rest of the curing agent;
the epoxy equivalent of the medium and high molecular weight waterborne epoxy emulsion is 450-750 g/Eq, and the epoxy equivalent of the medium and low molecular weight waterborne epoxy emulsion is 200-300 g/Eq.
Preferably, the medium and high molecular weight aqueous epoxy emulsion is selected from 6520-WH-53A of Hansen corporation, 3EE104W, 3EE102W, 3EE106Y of Gaoming chemical Limited in Foshan city, and the like. The medium and low molecular weight water-based epoxy emulsion is selected from E128-4 of Gaoming and same chemical company Limited in Fushan City, AB-EP-51(W70) of New Material development Limited in Zhejiang Anbang, 3515-W-60A of Vast, 128 of Nanya, and the like.
Further, the mass ratio of the component A to the component B is 4.2: 1-6.8: 1.
Further, the dispersant in the A component is at least one selected from the group consisting of a modified polyether dispersant, an acetylene glycol dispersant and a copolymer dispersant, and preferably Windigaku
Dispers 757, Yingchuangdi Gao
Dispers 655, winning
104BC and BYK-190 of Pico, Germany.
Further, the wetting agent in the A component is selected from polyether siloxane copolymer type wetting agents, preferablyChuangdi height of winning
Wet 270, Yingchuangdi Gao
Wet 280, BYK-346 of Pyk chemical Germany and BYK-345 of Pyk chemical Germany.
Further, the antifoaming agent in the component A is selected from an organic silicon type antifoaming agent or a mineral oil type antifoaming agent, preferably Yingchuangdi high
901W, AfCONA 2507, common coded DF-810, Blackbook
CF1536 and adentol VXW 6393.
Further, the flash rust inhibitor in the component A is selected from inorganic salt or organic rust inhibitor, preferably Raybo 60 of American Rebao, Raybo 75 of American Rebao high-efficiency antirust agent, sodium nitrite of Fochen chemical reagent GmbH, and Heloshi of American sea
330 and Haloshi, USA
515。
Further, the pigment and filler in the component A is selected from at least one of mica powder, silicon powder, barium sulfate, phosphate and black iron oxide, preferably wet-process mica powder GA-2 of Chuzhou keen mining industry Limited liability company, silicon micropowder GSF-1 of Chuzhou keen mining industry Limited liability company, barium sulfate HY-A03 of Hayan powder, and zinc orthophosphate hydrate of Hangzhou Haibo pigment Limited company
ZP-10 strontium polyphosphate, aluminum hydrate of Hangzhou Haibo pigment Co., Ltd
GXB-727 of SAPP and Hunan Tan ancient nonferrous metal products Co.
Further, the thickener in the component A is selected from polyurethane type thickeners, preferably BYK-425, BYK-430 and Clay's malacisTMMalhun of RM-12W, DowTM RM-2020。
Further, the adhesion promoter in the A component is any one selected from COATOSIL MP 200 from Mayer corporation, CoatOSIl 2287 from Mayer corporation, Lubrizol 2062H from Roche chemical company, and SYNTHRO-BOND AP 811 from pioneer chemical company.
Further, the curing agent in the component B is selected from waterborne modified amine adduct curing agents, preferably 6870 of Vast, 3EC151W of Gaoming chemical Co., Ltd, 3EC154W of Huangshan and BANCO 901 of synthetic materials Co., Ltd.
Further, the coalescent in the B component is selected from propylene glycol ethers, preferably dipropylene glycol n-propyl ether DPnP of Dow, propylene glycol n-butyl ether PnB of Dow, propylene glycol phenyl ether PPH of Dow and propylene glycol methyl ether PM of Dow.
The preparation method of the water-based epoxy primer-topcoat in one paint for the stainless steel substrate comprises the following steps:
(1) adding pigment and filler into a mixed solution of water, a dispersing agent, a wetting agent and a defoaming agent, and grinding until the fineness is less than or equal to 40 mu m to obtain slurry;
(2) adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion, water, the flash rust inhibitor, the adhesion promoter and the defoaming agent into the slurry, uniformly mixing, finally adding the thickening agent, stirring at room temperature until the viscosity is 110-115 KU, and uniformly mixing to obtain a component A;
(3) and uniformly mixing the curing agent, the film-forming assistant and water to obtain the component B.
Compared with the prior art, the invention combines two aqueous epoxy emulsions with the epoxy equivalent weight of 450-750 g/Eq and 200-300 g/Eq respectively, utilizes the epoxy emulsion with medium and high molecular weight to provide rigid structure support for a paint film, provides flexibility for the paint film, can enable the paint film to be in closer contact with a base material, is assisted with a corresponding adhesion promoter, and can be firmly attached to the surface of the stainless steel base material, thereby isolating the stainless steel base material from corrosive factors in the environment and improving the chemical corrosion resistance of the stainless steel base material.
Detailed Description
The invention discloses a two-component water-based epoxy primer-topcoat in-one paint with strong adhesive force to a stainless steel substrate, which is prepared by matching water-based epoxy emulsions with different molecular weights, and comprises a component A and a component B in a mass ratio of 4.2: 1-6.8: 1, wherein the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
30 to 40 percent of water;
10 to 20 percent of film forming auxiliary agent;
the rest of the curing agent;
wherein the epoxy equivalent of the medium and high molecular weight water-based epoxy emulsion is 450-750 g/Eq, and the epoxy equivalent of the medium and low molecular weight water-based epoxy emulsion is 200-300 g/Eq.
The preparation method of the water-based epoxy primer-topcoat in one paint for the stainless steel substrate comprises the following steps:
(1) adding pigment and filler into a mixed solution of water, a dispersing agent, a wetting agent and a defoaming agent, and grinding until the fineness is less than or equal to 40 mu m to obtain slurry;
(2) adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion, water, an anti-flash rust agent, an adhesion promoter and a defoaming agent into the slurry, uniformly mixing, finally adding a thickening agent, stirring at room temperature until the viscosity is 110-115 KU, and uniformly mixing to obtain a component A;
(3) and uniformly mixing the curing agent, the film-forming assistant and water to obtain the component B.
The technical solution of the present invention will be described in detail with reference to specific examples.
Example 1
The waterborne epoxy primer-topcoat paint for stainless steel substrates of the embodiment comprises the raw materials shown in Table 1, and the preparation method comprises the following steps:
(1) 7 percent of water, a dispersant, a wetting agent and 0.5 percent of a defoaming agent in the raw materials of the component A
901W, stirring at the speed of 1000r/min for 5min, and uniformly mixing to obtain a mixed solution. And then adding all pigments and fillers into the mixed solution, dispersing at a high speed of 1500r/min for 15-20 min, and grinding until the fineness is less than or equal to 40 mu m to obtain the slurry.
(2) Adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion and the rest water into the slurry, and stirring at the speed of 800r/min for 20 min; then adding an anti-flash rust agent, an adhesion promoter and 0.3 percent of defoaming agent
CF1536, stirring at 650r/min for 15 min. And finally, adding a thickening agent, stirring at the speed of 700r/min, and adjusting the viscosity to 110-115 KU (material temperature) to obtain the component A of the water-based epoxy primer-topcoat integrated paint.
(3) And mixing the curing agent, the film-forming assistant and water, and stirring at the stirring speed of 900r/min for 15min to obtain the component B of the water-based epoxy primer-topcoat in one paint.
And filtering the component A and the component B by using a 100-mesh filter screen respectively, discharging and packaging.
During construction, the component A and the component B are mixed according to the mass ratio of 4.2: 1-6.8: 1, the mixture is uniformly stirred, deionized water is added to adjust the viscosity of a paint sample to be proper, and the paint sample is cured for 30min to be used.
TABLE 1 example 1 raw materials and amounts of waterborne epoxy primer-topcoat paint
Example 2
The waterborne epoxy primer-topcoat paint for stainless steel substrates of the embodiment comprises the raw materials shown in Table 2, and the preparation method comprises the following steps:
(1) mixing 7% of water, a dispersing agent, a wetting agent and all defoaming agents in the component A raw materials, stirring for 5min at the speed of 1000r/min, and uniformly mixing to obtain a mixed solution. And then adding all pigments and fillers into the mixed solution, dispersing at a high speed of 1500r/min for 15-20 min, and grinding until the fineness is less than or equal to 40 mu m to obtain the slurry.
(2) Adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion and the rest water into the slurry, and stirring at the speed of 800r/min for 20 min; then adding the flash rust inhibitor and the adhesion promoter, and stirring for 15min at the speed of 650 r/min. And finally, adding a thickening agent, stirring at the speed of 700r/min, and adjusting the viscosity to 110-115 KU (material temperature) to obtain the component A of the water-based epoxy primer-topcoat integrated paint.
(3) And mixing the curing agent, the film-forming assistant and water, and stirring at the stirring speed of 900r/min for 15min to obtain the component B of the water-based epoxy primer-topcoat in one paint.
And filtering the component A and the component B by using a 100-mesh filter screen respectively, discharging and packaging.
TABLE 2 raw materials and amounts of the waterborne epoxy primer-topcoat paint of example 2
Example 3
The waterborne epoxy primer-topcoat paint for stainless steel substrates of the embodiment comprises the raw materials shown in Table 3, and the preparation method comprises the following steps:
(1) mixing 9% of water, a dispersing agent, a wetting agent and 0.7% of defoaming agent Coadd DF-810 in the raw materials of the component A, stirring for 5min at the speed of 1000r/min, and uniformly mixing to obtain a mixed solution. And then adding all pigments and fillers into the mixed solution, dispersing at a high speed of 1500r/min for 15-20 min, and grinding until the fineness is less than or equal to 40 mu m to obtain the slurry.
(2) Adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion and the rest water into the slurry, and stirring at the speed of 800r/min for 20 min; then, the flash rust inhibitor, the adhesion promoter and 0.3 percent of defoamer Additol VXW 6393 are added, and the mixture is stirred for 15min at the speed of 650 r/min. And finally, adding a thickening agent, stirring at the speed of 700r/min, and adjusting the viscosity to 110-115 KU (material temperature) to obtain the component A of the water-based epoxy primer-topcoat integrated paint.
(3) And mixing the curing agent, the film-forming assistant and water, and stirring at the stirring speed of 900r/min for 15min to obtain the component B of the water-based epoxy primer-topcoat in one paint.
And filtering the component A and the component B by using a 100-mesh filter screen respectively, discharging and packaging.
TABLE 3 example 3 raw materials and amounts of waterborne epoxy primer-topcoat paint
Comparative example 1
In contrast, the comparative example provides a two-component waterborne epoxy primer-topcoat paint, which omits the medium and high molecular weight waterborne epoxy emulsion compared with example 1.
Specifically, the two-component aqueous epoxy primer-topcoat two-in-one paint comprises a component A and a component B, wherein the raw materials of the component A comprise a medium-low molecular weight aqueous epoxy emulsion, a dispersing agent, a wetting agent, a defoaming agent, an anti-flash rust agent, pigment and filler, water, an adhesion promoter and a thickening agent, wherein the medium-low molecular weight aqueous epoxy emulsion is E128-4, and the mass percentage of the medium-low molecular weight aqueous epoxy emulsion in the component A is 41%. The products and the amounts of the dispersant, the wetting agent, the defoamer, the flash rust inhibitor, the pigment and filler, the water, the adhesion promoter and the thickener are the same as those of the component B in the embodiment 1.
Meanwhile, the preparation method of the two-component waterborne epoxy primer-topcoat paint in the comparative example is the same as that of example 1.
Comparative example 2
As another comparison, the present comparative example provides a two-component waterborne epoxy primer-topcoat paint, which omits the low-or medium-molecular-weight waterborne epoxy emulsion compared with example 1.
Specifically, the two-component aqueous epoxy primer-topcoat in one paint of the comparative example comprises a component A and a component B, wherein raw materials of the component A comprise a medium-high molecular weight aqueous epoxy emulsion, a dispersing agent, a wetting agent, a defoaming agent, an anti-flash rust agent, a pigment and filler, water, an adhesion promoter and a thickening agent, the medium-high molecular weight aqueous epoxy emulsion is 6520-WH-53A, the mass percentage of the medium-high molecular weight aqueous epoxy emulsion in the component A is 41%, and products and the using amounts of the dispersing agent, the wetting agent, the defoaming agent, the anti-flash rust agent, the pigment and filler, the water, the adhesion promoter and the thickening agent are specifically selected, and the component B is the same as in example 1.
Meanwhile, the preparation method of the two-component waterborne epoxy primer-topcoat paint in the comparative example is the same as that of example 1.
Uniformly mixing the component A and the component B of the waterborne epoxy primer-topcoat integrated paints of the embodiments 1-3, the comparative examples 1 and the comparative examples 2 according to the mass ratio of 4.2: 1-6.8: 1, adding deionized water to adjust to a proper viscosity, curing for 30min to obtain paint samples, spraying the paint samples to the surface of a stainless steel plate with a compact and smooth surface by using an airless spray gun to prepare corresponding test samples, and curing for 7d to perform performance tests, wherein the results are shown in Table 4.
TABLE 4 waterborne epoxy primer-topcoat one-in-one paint Performance
As can be seen from Table 4, the two-component water-based epoxy primer-topcoat paint has high viscosity which can reach 88-95 KU; meanwhile, the adhesive force is very strong, and particularly, the adhesive force of the two-component water-based epoxy primer-topcoat paint in the embodiment 1 is 0 grade no matter the two-component water-based epoxy primer-topcoat paint is cured under the standard conditions of being self-dried at normal temperature for 48 hours, baked at 60 ℃ for 30 minutes, and water-resistant for 20 days or water-resistant for 20 days for 24 hours. Meanwhile, the two-component water-based epoxy primer-topcoat paint has the neutral salt spray resistance time of 500 hours and has excellent chemical corrosion resistance. Due to the excellent adhesive force, the material can be used as a primer of a stainless steel base material and is firmly combined with the stainless steel base material; meanwhile, the paint can be used as finish paint due to the strong chemical corrosion resistance; the material can be used as primer-topcoat paint of stainless steel base materials by combining the overall properties.
In contrast, if a single medium-low molecular weight aqueous epoxy emulsion is adopted, as in comparative example 1, although the neutral salt spray resistance is good up to 500 hours due to the high molecular crosslinking density of the paint film, the wet adhesion performance is obviously reduced compared with the embodiment due to the brittle paint film; if a single medium-high molecular weight water-based epoxy emulsion is adopted as in comparative example 2, the neutral salt spray resistance of the paint film is poor due to small molecular crosslinking density, and the wet adhesion is also obviously reduced compared with the examples.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The water-based epoxy primer-topcoat in one paint for the stainless steel substrate is characterized in that: the paint comprises a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass:
30 to 40 percent of middle and high molecular weight waterborne epoxy emulsion;
4 to 8 percent of middle and low molecular weight waterborne epoxy emulsion;
0.5 to 1 percent of dispersant;
0-1% of a wetting agent;
0.5 to 1 percent of defoaming agent;
0.5 to 1.5 percent of flash rust inhibitor;
34 to 41 percent of color filler;
18 to 25 percent of water;
0.5 to 1 percent of adhesion promoter;
0.5 to 1.5 percent of thickening agent;
the component B comprises the following raw materials in percentage by mass:
30 to 40 percent of water;
10 to 20 percent of film forming auxiliary agent;
the rest of the curing agent;
wherein the epoxy equivalent of the medium and high molecular weight waterborne epoxy emulsion is 450-750 g/Eq, and the epoxy equivalent of the medium and low molecular weight waterborne epoxy emulsion is 200-300 g/Eq; the medium and high molecular weight water-based epoxy emulsion is selected from one of 6520-WH-53A of Vast, 3EE104W, 3EE102W and 3EE106Y of Gaoming Hoodda chemical industry Co., Ltd; the medium-low molecular weight aqueous epoxy emulsion is selected from E128-4 of Gaoming and Dude chemical industry Co., Ltd, AB-EP-51(W70) of New Material development Co., Ltd, Vast 3515-W-60A, and 128 of south Asia.
2. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the mass ratio of the component A to the component B is 4.2: 1-6.8: 1.
3. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the dispersant in the component A is at least one selected from modified polyether type dispersants, acetylene glycol type dispersants and copolymer type dispersants.
4. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the wetting agent in the A component is selected from polyether siloxane copolymer type wetting agents.
5. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the defoaming agent in the component A is selected from an organic silicon type defoaming agent or a mineral oil type defoaming agent.
6. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the flash rust inhibitor in the component A is selected from inorganic salt or organic rust inhibitor.
7. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the pigment and filler in the component A is selected from at least one of mica powder, silicon powder, barium sulfate, phosphate and iron oxide black.
8. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the thickener in the component A is selected from polyurethane type thickeners.
9. The waterborne epoxy primer-surfacer for stainless steel substrates according to claim 1, characterized in that: the curing agent in the component B is selected from a waterborne modified amine adduct curing agent.
10. A method for preparing the water-based epoxy primer-topcoat paint for stainless steel substrates according to any one of claims 1 to 9, wherein: the method comprises the following steps:
(1) adding pigment and filler into a mixed solution of water, a dispersing agent, a wetting agent and a defoaming agent, and grinding until the fineness is less than or equal to 40 mu m to obtain slurry;
(2) adding the medium-high molecular weight aqueous epoxy emulsion, the medium-low molecular weight aqueous epoxy emulsion, water, the flash rust inhibitor, the adhesion promoter and the defoaming agent into the slurry, uniformly mixing, finally adding the thickening agent, stirring at room temperature until the viscosity is 110-115 KU, and uniformly mixing to obtain a component A;
(3) and uniformly mixing the curing agent, the film-forming assistant and water to obtain the component B.
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