PH regulator and water-based acrylic coating

Abstract

The invention discloses a pH (Potential of Hydrogen) regulator and a water-based acrylic coating, and the pH regulator comprises N-hydroxyethyl-2-hydroxyethyl aminopropionate and / or N, N-dihydroxyethyl-2-hydroxyethyl aminopropionate and / or N, N-dihydroxyethyl-2-hydroxyethyl aminopropionate. The water-based acrylic coating comprises the pH regulator. The pH regulator has anti-freezing and anti-flash-rust effects at the same time, and the freeze-thaw stability and the anti-flash-rust property of the water-based acrylic coating can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a pH regulator and a water-based acrylic coating. Background Art

[0002] Water-based acrylic anti-corrosion coatings have been widely used in the field of light corrosion protection, especially in the fields of steel structures, grids, mechanical equipment, small parts, etc. There are two types of pH adjusters commonly used in water-based acrylic anti-corrosion coatings. One is inorganic alkali, such as ammonia water, sodium hydroxide, etc.; the other is organic amine, such as N,N-dimethylethanolamine (DMEA), AMP-95, etc.

[0003] The freeze-thaw stability of water-based acrylic anticorrosive coatings is also a particularly important property when constructing in winter. The current method to solve the freeze-thaw stability of water-based acrylic coatings from the perspective of formulation is to add antifreeze. Commercial antifreeze is currently divided into two categories. The first category is polyols (easily soluble in water), such as propylene glycol, glycerol, etc.; the second category is surfactant type.

[0004] The principle of polyol antifreeze to improve freeze-thaw stability is relatively clear, that is, to lower the freezing point of water-based coatings. The principle of polyol antifreeze to lower the freezing point can be summarized into two types. The first is the physical properties of the solution, that is, the addition of polyol antifreeze can lower the freezing point of the overall solution; the second is the chemical force. Polyol antifreeze can form strong hydrogen bonds with water, and hydrogen bonds can reduce the ability of water molecules to form ice crystals; at the same time, this hydrogen bond can also destroy the hydrogen bond network between water molecules, affecting the crystallization of water molecules and lowering the freezing point.

[0005] The principle of surfactant antifreeze to improve freeze-thaw stability is not yet fully understood. Surfactants generally have the function of dispersing, wetting and even thickening. Therefore, surfactant antifreeze added to water-based paint can also be used as a wetting dispersant or thickener; or a wetting dispersant has the function of an antifreeze agent; a thickener (alkali swelling thickener of acrylic emulsion type) has an antifreeze effect.

[0006] It can be seen that polyol type antifreeze agents are generally added to the coating formula in the form of a single-functional additive; surfactant type antifreeze agents are generally added as additives with two functions, such as wetting and dispersing and antifreeze, thickening and antifreeze, etc.

[0007] In addition to being added to the coating formula as an additive, surfactant-type antifreeze agents can also be added to the system during the synthesis stage of water-based acrylic emulsions to enhance the antifreeze-thaw performance of the acrylic emulsion itself. The principle is as follows: During the synthesis of water-based acrylic emulsions, surfactants must be used to emulsify monomers and form latex particles. Surfactant-type antifreeze agents also have an emulsifying effect. Therefore, surfactant-type antifreeze agents are used as one of the emulsifiers in the synthesis of acrylic emulsions to prepare a modified acrylic emulsion with antifreeze properties.

[0008] There are two methods for adding surfactant-type antifreeze to the synthesis process of acrylic emulsion. One is to use surfactant-type antifreeze as a non-reactive emulsifier. This type of technical route often requires functional monomers to participate in polymerization to ensure good anti-freeze-thaw performance. The other is to use surfactant-type antifreeze as a reactive emulsifier or reactive raw material to participate in the acrylic polymerization reaction.

[0009] Existing pH regulators and polyol antifreeze agents are both single-function additives. Summary of the invention

[0010] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the object of the present invention is to provide a pH regulator and a water-based acrylic paint.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] The first aspect of the present invention provides a pH regulator, comprising hydroxyethyl N-hydroxyethyl-2-aminopropionate and / or hydroxyethyl N,N-dihydroxyethyl-2-aminopropionate.

[0013] In the present invention, N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and / or N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester can be used as pH regulators for waterborne acrylic paints, thereby making the paints have freeze-thaw stability and / or flash rust resistance.

[0014] N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester is a secondary amine with a high pH value, which can reduce the reaction rate of electrochemical corrosion and slow down the occurrence of rust. N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester is a tertiary amine. When a tertiary amine is adsorbed on a metal surface, its steric hindrance is greater than that of a secondary amine. Then, N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester is more inclined to adsorb on the metal surface, react chemically with the metal surface, and form a dense protective film. At the same time, the hydrophobic chain will form a hydrophobic layer to isolate water and oxygen from corroding the coated substrate. The protective film and the hydrophobic layer can isolate the surface of the coated substrate from contact with the outside world and prevent the substrate from continuing to be corroded. Tertiary amines tend to disperse in the coating system and form more strong hydrogen bonds with water than secondary amines. A large number of hydrogen bonds can reduce the ability of water molecules to form ice crystals. Hydrogen bonds can also destroy the hydrogen bond network between water molecules themselves, affecting the crystallization of water molecules, thereby lowering the freezing point and improving freeze-thaw stability.

[0015] In some embodiments of the present invention, the pH regulator includes N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester; the molar ratio of N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester to N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester is 1: (0.5-1.5), such as 1: (0.8-1.2), 1: 1, etc. N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester have a very strong synergistic effect, and jointly improve the flash rust resistance and freeze-thaw stability of the water-based acrylic coating.

[0016] In some embodiments of the present invention, the method for preparing the pH regulator comprises: subjecting ethanolamine and / or diethanolamine to a Michael addition reaction with hydroxyethyl acrylate to obtain the pH regulator.

[0017] In some embodiments of the present invention, the temperature of the Michael addition reaction is 35-50°C, such as 35-45°C, 40°C, etc.; the time of the Michael addition reaction is 48-90h, such as 60-80h; and the Michael addition reaction is carried out in an inert atmosphere.

[0018] The second aspect of the present invention provides a water-based acrylic paint, comprising the pH regulator.

[0019] In some embodiments of the present invention, the water-based acrylic paint further comprises a water-based acrylic resin, a filler, a pigment, a film-forming aid and water, and optionally, a defoamer, a thickener, an anti-settling agent and a dispersant.

[0020] In some embodiments of the present invention, the water-based acrylic paint includes the following raw materials in parts by weight: 40 to 45 parts of water-based acrylic resin, 25 to 35 parts of filler, 5 to 20 parts of the pH adjuster, 5 to 10 parts of pigment, 2 to 3 parts of film-forming aid, 0.5 to 1 part of defoamer, 0.1 to 1 part of thickener, 0.1 to 1 part of anti-settling agent, 0.5 to 1.5 parts of dispersant and balance water.

[0021] In some embodiments of the present invention, the water-based acrylic paint includes the following raw materials in parts by weight: 40 to 45 parts of water-based acrylic resin, 25 to 35 parts of filler, 10 to 15 parts of the pH adjuster, 5 to 10 parts of pigment, 2.5 to 3 parts of film-forming aid, 0.5 to 1 part of defoamer, 0.3 to 0.6 part of thickener, 0.1 to 0.5 part of anti-settling agent, 0.5 to 1.5 parts of dispersant and balance water.

[0022] In some embodiments of the present invention, the solid content of the water-based acrylic resin is 45% to 49% (such as 45% to 48%), the minimum film-forming temperature is 20°C to 28°C, such as 20°C to 25°C, such as at least one of Henghe Yongsheng's 2081A, Henghe Yongsheng's 2052, Badufu's 3712, Badufu's 3616, Hengshui Xinguang's 725, Landburg's KG12 resin, Wanhua's 0613 resin, Wanhua's 0620 resin, and Wanhua Chemical's 0628.

[0023] In some embodiments of the present invention, the filler includes at least one of feldspar powder, talc, kaolin, calcium carbonate, wollastonite powder, heavy calcium powder, lithopone, mica powder and hollow glass microspheres, such as talc and heavy calcium powder in a mass ratio of 1: (4 to 6).

[0024] In some embodiments of the present invention, the pigment includes at least one of titanium dioxide, carbon black, black iron oxide, yellow iron oxide, red iron oxide, phthalocyanine blue, and phthalocyanine green. The pigment can be selected according to actual application needs and belongs to conventional technical means in the field.

[0025] In some embodiments of the present invention, the film-forming aid includes at least one of alcohol ester dodecahydrate, alcohol ester hexadecene, propylene glycol phenyl ether (ppH), propylene glycol butyl ether, and dipropylene glycol butyl ether (DPnB).

[0026] In some embodiments of the present invention, the defoamer includes a polyether-modified silicone defoamer, such as at least one of Shenzhu Technology SN-6791, Digao 901W, BYK-024, DT-650, Dow (Dow Corning) AFE-7610, and Dow (Dow Corning) AFE-7820.

[0027] In some embodiments of the present invention, the thickener includes a polyurethane thickener or an alkali swelling thickener, such as L344 of Shenzhe New Materials and alkali swelling thickener H-120 of Puwei Low Shear.

[0028] In some embodiments of the present invention, the polyurethane thickener is a water-insoluble low-shear polyurethane thickener; preferably, the mass ratio of the non-volatile components of the water-insoluble low-shear polyurethane thickener is 40% to 50%.

[0029] In some embodiments of the present invention, the polyurethane thickener includes Wanhua Chemical's low-shear polyurethane thickener U-905 and Gotai's low-shear polyurethane thickener XS-83.

[0030] In some embodiments of the present invention, the alkali swelling thickener is a low shear alkali swelling thickener; preferably, the mass proportion of the active component of the low shear alkali swelling thickener is 28% to 32%.

[0031] In some embodiments of the present invention, the anti-settling agent includes at least one of bentonite, hydroxyethyl cellulose, and polyamide wax.

[0032] In some embodiments of the present invention, the dispersant includes an acrylate dispersant, such as at least one of Dow's 731A, Arkema's BR85, and BYK-154.

[0033] The third aspect of the present invention provides a method for preparing the water-based acrylic paint, comprising the following steps: mixing various preparation raw materials to obtain the water-based acrylic paint.

[0034] In some embodiments of the present invention, in the preparation method, the mixing order of the preparation raw materials is water, anti-settling agent, dispersant, the pH adjuster, water-based acrylic resin, defoaming agent, pigment, filler, film-forming aid, and thickener.

[0035] The fourth aspect of the present invention provides a use of the water-based acrylic paint in material protection.

[0036] In some embodiments of the present invention, the material is selected from metal materials.

[0037] The beneficial effects of the present invention are:

[0038] The pH regulator of the invention has the functions of antifreeze and anti-flash rust, and can solve the freeze-thaw stability and anti-flash rust property of water-based acrylic paint. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0040] Example 1

[0041] This embodiment prepares a pH regulator, and the specific process is as follows:

[0042] Ethanolamine (0.1 mol, 6.1 g), diethanolamine (10.5 g), and hydroxyethyl acrylate (23.2 g) were weighed into a 100 mL two-necked bottle, and reacted at 40° C. in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH regulator.

[0043] Example 2

[0044] This embodiment prepares a pH regulator, and the specific process is as follows:

[0045] Diethanolamine (10.5 g) and hydroxyethyl acrylate (11.6 g) were weighed into a 100 mL two-necked bottle, and the mixture was reacted at 40° C. in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH regulator.

[0046] Example 3

[0047] This embodiment prepares a pH regulator, and the specific process is as follows:

[0048] Ethanolamine (6.1 g) and hydroxyethyl acrylate (11.6 g) were placed in a 100 mL two-necked bottle, and reacted at 40° C. in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH regulator.

[0049] Example 4

[0050] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0051] 5 parts of water, 0.4 parts of anti-settling agent, 0.5 parts of dispersant, 10 parts of pH regulator prepared in Example 1, 45 parts of water-based acrylic resin, 0.5 parts of defoamer, 5 parts of pigment, 30 parts of filler, 3 parts of film-forming aid, and 0.6 parts of thickener were added to the dispersion tank in sequence. The mixture was stirred evenly at high speed and filtered through 200 mesh to obtain a water-based acrylic paint.

[0052] Among them, the anti-settling agent is Heidi bentonite 603; the defoaming agent is Shenzhen Zhu Technology SN-6791; the dispersant is BYK-190 from BYK Chemical and Dow's 731A; the water-based acrylic resin is 2081A from Henghe Yongsheng; the pigment is titanium dioxide; the filler is heavy calcium powder; the film-forming aid is propylene glycol phenyl ether (ppH); and the thickener is Wanhua Chemical's low-shear polyurethane thickener U-905.

[0053] Example 5

[0054] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0055] 7 parts of water, 0.3 parts of anti-settling agent, 1 part of dispersant, 15 parts of pH regulator prepared in Example 1, 40 parts of water-based acrylic resin, 0.8 parts of defoamer, 8 parts of pigment, 25 parts of filler, 2.5 parts of film-forming aid, and 0.4 parts of thickener were added to the dispersion tank in sequence. The mixture was stirred evenly at high speed and filtered through 200 mesh to obtain a water-based acrylic primer.

[0056] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoaming agent is Digo's 901W; the dispersant is Arkema's BR85; the water-based acrylic resin is Badful's 3712; the pigment is red iron oxide; the filler is feldspar powder and talcum powder; the film-forming aid is alcohol ester dodecahydrate; and the thickener is Puwei's low-shear alkali swelling thickener H-120.

[0057] Example 6

[0058] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0059] 10 parts of water, 0.5 parts of anti-settling agent, 1.5 parts of dispersant, 12 parts of pH regulator prepared in Example 1, 42 parts of water-based acrylic resin, 1 part of defoamer, 10 parts of pigment, 20 parts of filler, 2.7 parts of film-forming aid, and 0.3 parts of thickener were added to the dispersion tank in sequence. The mixture was stirred evenly at high speed and filtered through 200 meshes to obtain a water-based acrylic primer.

[0060] Among them, the anti-settling agent is Huihong Chemical's polyamide wax 7022; the dispersant is BYK-154 from BYK Chemical and Gotech's 790; the defoamer is BYK-024 from BYK Chemical; the water-based acrylic resin is Hengshui Xinguang's 725; the pigments are black iron oxide and yellow iron oxide; the fillers are silica powder and heavy calcium powder; the film-forming aid is dipropylene glycol butyl ether (DPnB); and the thickener is Gotech's low-shear polyurethane thickener XS-83.

[0061] Example 7

[0062] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0063] Add 11 parts of water, 0.3 parts of anti-settling agent, 1.5 parts of dispersant, 4 parts of pH regulator prepared in step 1, 45 parts of water-based acrylic resin, 0.8 parts of defoamer, 10 parts of pigment, 24.3 parts of filler, 2.5 parts of film-forming aid, and 0.6 parts of thickener into the dispersion tank in sequence. Stir evenly at high speed and filter through 200 meshes to obtain a water-based acrylic primer.

[0064] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoaming agent is Digo's 901W; the dispersant is BYK-154 from BYK Chemical; the water-based acrylic resin is Badful's 3712; the pigment is red iron oxide; the filler is heavy calcium powder, the film-forming aid is alcohol ester twelve, and the thickener is Gotai low-shear polyurethane thickener XS-83.

[0065] Example 8

[0066] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0067] 5 parts of water, 0.4 parts of anti-settling agent, 0.5 parts of dispersant, 10 parts of pH regulator prepared in Example 2, 45 parts of water-based acrylic resin, 0.5 parts of defoamer, 5 parts of pigment, 30 parts of filler, 3 parts of film-forming aid, and 0.6 parts of thickener were added to the dispersion tank in sequence. The mixture was stirred evenly at high speed and filtered through 200 mesh to obtain a water-based acrylic paint.

[0068] Among them, the anti-settling agent is Hedis bentonite 603; the defoaming agent is SN-6791 from Shenzhen Zhu Technology; the dispersant is Dow's 731A; the water-based acrylic resin is 2081A from Henghe Yongsheng; the pigment is titanium dioxide; the filler is feldspar powder and talcum powder; the film-forming aid is propylene glycol phenyl ether (ppH); and the thickener is Wanhua Chemical's low-shear polyurethane thickener U-905.

[0069] Example 9

[0070] This embodiment prepares a water-based acrylic paint, and the specific process is as follows:

[0071] 7 parts of water, 0.3 parts of anti-settling agent, 1 part of dispersant, 15 parts of pH regulator prepared in Example 3, 40 parts of water-based acrylic resin, 0.8 parts of defoamer, 8 parts of pigment, 25 parts of filler, 2.5 parts of film-forming aid, and 0.4 parts of thickener were added to the dispersion tank in sequence. The mixture was stirred evenly at high speed and filtered through 200 mesh to obtain a water-based acrylic paint.

[0072] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoaming agent is Digo's 901W; the dispersant is Arkema's BR85; the water-based acrylic resin is Badful's 3712; the pigment is red iron oxide; the filler is feldspar powder and talcum powder; the film-forming aid is alcohol ester dodecahydrate; and the thickener is Puwei's low-shear alkali swelling thickener H-120.

[0073] Comparative Example

[0074] This comparative example prepared a water-based acrylic paint, and the specific process was as follows:

[0075] Add 10 parts of water, 0.3 parts of anti-settling agent, 1.5 parts of dispersant, 5 parts of pH adjuster, 45 parts of water-based acrylic resin, 0.8 parts of defoamer, 10 parts of pigment, 24.3 parts of filler, 2.5 parts of film-forming aid, and 0.6 parts of thickener into the dispersion tank. Stir evenly at high speed and filter through 200 mesh to obtain water-based acrylic primer.

[0076] Among them, the pH adjuster is diethanolamine and triethanolamine in a molar ratio of 1:1; the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoaming agent is Digo's 901W; the dispersant is BYK-154 from BYK Chemical; the water-based acrylic resin is Badful's 3712; the pigment is red iron oxide; the filler is heavy calcium powder; the film-forming aid is alcohol ester twelve; and the thickener is Gotai low-shear polyurethane thickener XS-83.

[0077] Test example

[0078] This test example tests the performance of water-based acrylic paint. The specific process is as follows:

[0079] Freeze-thaw stability test method: The finished water-based acrylic paint is placed in a refrigerator at -5°C for 16 hours, and then placed at room temperature for 8 hours. This is one cycle, and a total of three cycles are tested. If demulsification or gelation occurs, it will fail.

[0080] Anti-flash rust test method: spray the finished water-based acrylic paint onto the industry standard sandblasting plate (specification is 150*70*3mm) with a wet film thickness of 100 microns. Then place it in a standard curing environment for curing (relative humidity 50±5%RH, temperature is 23±2℃), and observe whether flash rust occurs.

[0081] The test results are shown in the following table:

[0082] Table 1

[0083] Test items Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative Example Freeze-thaw stability pass pass pass Demulsification pass Demulsification pass Flash rust? no no no no Flash Rust no Flash Rust

[0084] It can be seen that the N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester of the present invention has an anti-flash rust effect in water-based acrylic paint; while N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester has an anti-freeze-thaw effect in water-based acrylic paint, and N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester have a good synergistic effect, and have anti-freeze-thaw and anti-flash rust effects in water-based acrylic paint. The comparative example uses diethanolamine and triethanolamine, but does not have a hydrophobic segment, and can only improve the anti-freeze-thaw effect, but cannot achieve the effect of improving the anti-flash rust effect.

[0085] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A pH adjusting agent, characterized in that: Including N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and / or N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester.

2. The pH adjusting agent according to claim 1, characterized in that: The pH regulator includes N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester; the molar ratio of N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester to N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester is 1: (0.5-1.5).

3. The pH adjusting agent according to claim 1, characterized in that: The preparation method of the pH regulator comprises: subjecting ethanolamine and / or diethanolamine to Michael addition reaction with hydroxyethyl acrylate to obtain the pH regulator.

4. A water-based acrylic paint, characterized in that: The pH regulator comprises the pH regulator according to any one of claims 1 to 3.

5. The water-based acrylic paint according to claim 4, characterized in that: The water-based acrylic paint further comprises a water-based acrylic resin, a filler, a pigment, a film-forming aid and water, and optionally, a defoamer, a thickener, an anti-settling agent and a dispersant.

6. The water-based acrylic paint according to claim 5, characterized in that: The water-based acrylic paint comprises the following raw materials in parts by weight: 40 to 45 parts of water-based acrylic resin, 25 to 35 parts of filler, 5 to 20 parts of the pH adjuster, 5 to 10 parts of pigment, 2 to 3 parts of film-forming aid, 0.5 to 1 part of defoamer, 0.1 to 1 part of thickener, 0.1 to 1 part of anti-settling agent, 0.5 to 1.5 parts of dispersant and balance water.

7. The water-based acrylic paint according to claim 5, characterized in that: The water-based acrylic paint meets at least one of the following conditions: (I) the water-based acrylic resin has a solid content of 45% to 49% and a minimum film-forming temperature of 20° C. to 28° C.; (II) the film-forming aid comprises at least one of alcohol ester dodecahydrate, alcohol ester hexahydrate, propylene glycol phenyl ether, propylene glycol butyl ether, and dipropylene glycol butyl ether; (III) The defoaming agent includes a polyether-modified silicone defoaming agent.

8. The water-based acrylic paint according to claim 5, characterized in that: The water-based acrylic paint meets at least one of the following conditions: (I) the filler comprises at least one of feldspar powder, talc, kaolin, calcium carbonate, wollastonite powder, heavy calcium powder, lithopone, mica powder and hollow glass microspheres; (II) the pigment comprises at least one of titanium dioxide, carbon black, black iron oxide, yellow iron oxide, red iron oxide, phthalocyanine blue and phthalocyanine green; (III) The thickener includes a polyurethane thickener or an alkali swelling thickener.

9. A method for preparing a water-based acrylic paint according to any one of claims 4 to 8, characterized in that: The following steps are involved: The prepared raw materials are mixed to obtain the water-based acrylic paint.

10. Use of the water-based acrylic paint according to any one of claims 4 to 8 in material protection.