pH adjusters, aqueous acrylic paints

Abstract

The application discloses a pH regulator, a water-based acrylic coating, the pH regulator comprising N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and / or N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester. The water-based acrylic coating comprises the pH regulator. The pH regulator of the application has the effects of antifreezing and anti-flash rusting, and can solve the freeze-thaw stability and anti-flash rusting of the water-based acrylic coating.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and particularly to pH adjusters and water-based acrylic coatings. Background Technology

[0002] Waterborne acrylic anticorrosive coatings are widely used in the field of light corrosion protection, especially in steel structures, space frames, machinery, and small parts. Waterborne acrylic anticorrosive coatings commonly use two types of pH adjusters: inorganic alkalis, such as ammonia and sodium hydroxide; and organic amines, such as N,N-dimethylethanolamine (DMEA) and AMP-95.

[0003] Freeze-thaw stability is a particularly important performance characteristic for waterborne acrylic anti-corrosion coatings, especially during winter application. Currently, the method to address freeze-thaw stability in waterborne acrylic coatings from a formulation perspective is to add antifreeze agents. Commercially available antifreeze agents are mainly divided into two categories: the first is polyols (easily soluble in water), such as propylene glycol and glycerol; the second is surfactants.

[0004] The principle behind polyol-based antifreeze agents improving freeze-thaw stability is relatively clear: they lower the freezing point of water-based coatings. The mechanism by which polyol-based antifreeze agents lower the freezing point can be summarized into two types. The first is the physical property of the solution; the addition of polyol-based antifreeze agents can lower the overall freezing point of the solution. The second is chemical forces; polyol-based antifreeze agents can form strong hydrogen bonds with water, which reduces the ability of water molecules to form ice crystals. Simultaneously, these hydrogen bonds can also disrupt the hydrogen bond network between water molecules, affecting water molecule crystallization and thus lowering the freezing point.

[0005] The mechanism by which surfactant-based antifreeze agents improve freeze-thaw stability is not yet fully understood. Surfactants generally have dispersing, wetting, and even thickening effects. Therefore, when adding surfactant-based antifreeze agents to water-based coatings, they can also be used as wetting and dispersing agents or thickeners; or the wetting and dispersing agents can also function as antifreeze agents; thickeners (alkali-soluble thickeners of acrylic emulsion type) have antifreeze properties.

[0006] It can be seen that polyol-type antifreeze is generally added to the coating formulation as a single-function additive; surfactant-type antifreeze is generally added as an additive that takes into account two functions, such as wetting and dispersing as well as antifreeze, thickening and antifreeze, etc.

[0007] Besides being added to coating formulations as additives, surfactant-type antifreeze agents can also be incorporated into the synthesis stage of aqueous acrylic emulsions to enhance their freeze-thaw resistance. The principle is as follows: Surfactants are essential in the synthesis of aqueous acrylic emulsions to emulsify monomers and form latex particles. Surfactant-type antifreeze agents also possess emulsifying properties. Therefore, using surfactant-type antifreeze agents as emulsifiers in the synthesis of acrylic emulsions results in the preparation of a modified acrylic emulsion with antifreeze capabilities.

[0008] There are two methods for synthesizing acrylic emulsions by incorporating surfactant-type antifreeze agents. One method uses the surfactant-type antifreeze agent as a non-reactive emulsifier; this approach often requires the addition of functional monomers to the polymerization process to ensure good freeze-thaw resistance. The other method uses the surfactant-type antifreeze agent as a reactive emulsifier or reactive feedstock in the acrylic acid polymerization reaction.

[0009] Existing pH adjusters and polyol antifreeze agents are all single-function additives. Summary of the Invention

[0010] The present invention aims to solve at least one of the aforementioned technical problems existing in the prior art. Therefore, the object of the present invention is to provide a pH adjuster and a water-based acrylic coating.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] A first aspect of the invention provides a pH adjuster comprising N-hydroxyethyl-2-aminopropionate hydroxyethyl ester and / or N,N-dihydroxyethyl-2-aminopropionate hydroxyethyl ester.

[0013] In this invention, N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and / or N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester can be used as pH adjusters for waterborne acrylic coatings, thereby enabling them to possess freeze-thaw stability and / or flash rust prevention.

[0014] N-Hydroxyethyl-2-aminopropionic acid hydroxyethyl ester is a secondary amine with a high pH, ​​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 tertiary amines are adsorbed on the metal surface, their steric hindrance is greater than that of secondary amines. Therefore, N-Hydroxyethyl-2-aminopropionic acid hydroxyethyl ester tends to adsorb on the metal surface and react chemically with the metal surface to form a dense protective film. At the same time, the hydrophobic chains form a hydrophobic layer, which isolates 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 being further 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, affecting water molecule crystallization and thus lowering the freezing point and improving freeze-thaw stability.

[0015] In some embodiments of the present invention, the pH adjuster comprises hydroxyethyl N-hydroxyethyl-2-aminopropionate and hydroxyethyl N,N-dihydroxyethyl-2-aminopropionate; the molar ratio of hydroxyethyl N-hydroxyethyl-2-aminopropionate to hydroxyethyl N,N-dihydroxyethyl-2-aminopropionate is 1:(0.5-1.5), such as 1:(0.8-1.2), 1:1, etc. Hydroxyethyl N-hydroxyethyl-2-aminopropionate and hydroxyethyl N,N-dihydroxyethyl-2-aminopropionate have a very strong synergistic effect, jointly improving the flash rust resistance and freeze-thaw stability of waterborne acrylic coatings.

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

[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] A second aspect of the present invention provides an aqueous acrylic coating comprising the aforementioned pH adjuster.

[0019] In some embodiments of the present invention, the waterborne acrylic coating further includes waterborne acrylic resin, filler, pigment, film-forming aid and water, and optionally, defoamer, thickener, anti-settling agent and dispersant.

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

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

[0022] In some embodiments of the present invention, the waterborne acrylic resin has a solid content of 45% to 49% (e.g., 45% to 48%) and a minimum film-forming temperature of 20°C to 28°C (e.g., 20°C to 25°C), such as at least one of Henghe Yongsheng's 2081A, Henghe Yongsheng's 2052, Badifu's 3712, Badifu's 3616, Hengshui Xinguang's 725, Landeburg'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 powder, kaolin, calcium carbonate, wollastonite powder, heavy calcium carbonate powder, lithopone, mica powder and hollow glass microspheres, such as talc powder and heavy calcium carbonate powder in a mass ratio of 1:(4-6).

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

[0025] In some embodiments of the present invention, the film-forming aid includes at least one of alcohol ester dodecyl, alcohol ester hexadecyl, 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 at least one of polyether-modified silicone defoamers, such as Deep Bamboo Technology SN-6791, DIGIC 901W, BYK-024, DT-650, Dow Corning AFE-7610, and Dow Corning AFE-7820.

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

[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 component 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 Gaotai'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 active ingredient mass ratio 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 at least one of acrylate dispersants, such as Dow's 731A, Arkema's BR85, and BYK-154 from BYK Chemical.

[0033] A third aspect of the present invention provides a method for preparing the waterborne acrylic coating, comprising the following steps: mixing the various raw materials to obtain the waterborne acrylic coating.

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

[0035] A fourth aspect of the present invention provides an application of the aforementioned waterborne acrylic coating in material protection.

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

[0037] The beneficial effects of this invention are:

[0038] The pH adjuster of this invention has both antifreeze and anti-flash rust functions, which can solve the freeze-thaw stability and anti-flash rust properties of water-based acrylic coatings. Detailed Implementation

[0039] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0040] Example 1

[0041] This embodiment prepares a pH adjuster, 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 flask and reacted at 40 °C in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH adjuster.

[0043] Example 2

[0044] This embodiment prepares a pH adjuster, 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 flask and reacted at 40 °C in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH adjuster.

[0046] Example 3

[0047] This embodiment prepares a pH adjuster, 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 flask and reacted at 40 °C in the dark for 72 h under magnetic stirring and nitrogen protection to obtain a pH adjuster.

[0049] Example 4

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

[0051] Add the following ingredients sequentially to a dispersion tank: 5 parts water, 0.4 parts anti-settling agent, 0.5 parts dispersant, 10 parts pH adjuster prepared in Example 1, 45 parts water-based acrylic resin, 0.5 parts defoamer, 5 parts pigment, 30 parts filler, 3 parts film-forming aid, and 0.6 parts thickener. Stir at high speed until homogeneous, then filter through a 200-mesh sieve to obtain the water-based acrylic coating.

[0052] Among them, the anti-settling agent is Haidis bentonite 603; the defoamer is Shenzhu Technology SN-6791; the dispersant is BYK-190 from BYK Chemical and 731A from Dow Chemical; the waterborne acrylic resin is Henghe Yongsheng 2081A; the pigment is titanium dioxide; the filler is heavy calcium carbonate 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 coating, and the specific process is as follows:

[0055] Add 7 parts water, 0.3 parts anti-settling agent, 1 part dispersant, 15 parts pH adjuster prepared in Example 1, 40 parts water-based acrylic resin, 0.8 parts defoamer, 8 parts pigment, 25 parts filler, 2.5 parts film-forming aid, and 0.4 parts thickener to a dispersion tank in sequence. Stir at high speed until homogeneous, and filter through a 200-mesh sieve to obtain the water-based acrylic primer.

[0056] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoamer is DIGIC's 901W; the dispersant is Arkema's BR85; the waterborne acrylic resin is BADEFU's 3712; the pigment is iron oxide red; the filler is feldspar powder and talc powder; the film-forming aid is alcohol ester twelve; and the thickener is PUBLE's low-shear alkali-soluble swelling thickener H-120.

[0057] Example 6

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

[0059] Add the following ingredients sequentially to a dispersion tank: 10 parts water, 0.5 parts anti-settling agent, 1.5 parts dispersant, 12 parts pH adjuster prepared in Example 1, 42 parts waterborne acrylic resin, 1 part defoamer, 10 parts pigment, 20 parts filler, 2.7 parts film-forming aid, and 0.3 parts thickener. Stir at high speed until homogeneous, then filter through a 200-mesh sieve to obtain the waterborne 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 790 from Gaotai; the defoamer is BYK-024 from BYK Chemical; the waterborne acrylic resin is Hengshui Xinguang's 725; the pigments are iron oxide black and iron oxide yellow; the fillers are silica powder and heavy calcium carbonate powder; the film-forming aid is dipropylene glycol butyl ether (DPnB); and the thickener is Gaotai's low-shear polyurethane thickener XS-83.

[0061] Example 7

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

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

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

[0065] Example 8

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

[0067] Add 5 parts water, 0.4 parts anti-settling agent, 0.5 parts dispersant, 10 parts pH adjuster prepared in Example 2, 45 parts water-based acrylic resin, 0.5 parts defoamer, 5 parts pigment, 30 parts filler, 3 parts film-forming aid, and 0.6 parts thickener to a dispersion tank in sequence. Stir at high speed until homogeneous, and filter through a 200-mesh sieve to obtain the water-based acrylic coating.

[0068] Among them, the anti-settling agent is Haidis bentonite 603; the defoamer is Shenzhu Technology SN-6791; the dispersant is Dow's 731A; the waterborne acrylic resin is Henghe Yongsheng's 2081A; the pigment is titanium dioxide; the filler is feldspar powder and talc 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 coating, and the specific process is as follows:

[0071] Add 7 parts water, 0.3 parts anti-settling agent, 1 part dispersant, 15 parts pH adjuster prepared in Example 3, 40 parts water-based acrylic resin, 0.8 parts defoamer, 8 parts pigment, 25 parts filler, 2.5 parts film-forming aid, and 0.4 parts thickener to a dispersion tank in sequence. Stir at high speed until homogeneous, and filter through a 200-mesh sieve to obtain the water-based acrylic coating.

[0072] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoamer is DIGIC's 901W; the dispersant is Arkema's BR85; the waterborne acrylic resin is BADEFU's 3712; the pigment is iron oxide red; the filler is feldspar powder and talc powder; the film-forming aid is alcohol ester twelve; and the thickener is PUBLE's low-shear alkali-soluble swelling thickener H-120.

[0073] Comparative Example

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

[0075] Add the following ingredients sequentially to a dispersion tank: 10 parts water; 0.3 parts anti-settling agent; 1.5 parts dispersant; 5 parts pH adjuster; 45 parts water-based acrylic resin; 0.8 parts defoamer; 10 parts pigment; 24.3 parts filler; 2.5 parts film-forming aid; and 0.6 parts thickener. Stir at high speed until homogeneous, then filter through a 200-mesh sieve to obtain the water-based acrylic primer.

[0076] 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 defoamer is Digo's 901W; the dispersant is BYK-154 from BYK Chemicals; the waterborne acrylic resin is 3712 from BADEF; the pigment is iron oxide red; the filler is heavy calcium carbonate powder; the film-forming aid is alcohol ester dodecyl; and the thickener is Gaotai low-shear polyurethane thickener XS-83.

[0077] Test case

[0078] This experimental example tests the performance of water-based acrylic coatings. The specific procedure is as follows:

[0079] Freeze-thaw stability test method: The finished water-based acrylic coating is placed in a freezer at -5℃ for 16 hours, and then placed at room temperature for 8 hours. This constitutes one cycle, and a total of three cycles are tested. If demulsification or gelation occurs, the coating fails the test.

[0080] Flash rust resistance test method: Apply the finished water-based acrylic coating to a standard sandblasted plate (150*70*3mm) using air spraying, with a wet film thickness of 100 micrometers. Then place it in a standard curing environment (relative humidity 50±5%RH, temperature 23±2℃) and observe whether flash rust occurs.

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

[0082] Table 1

[0083] freeze-thaw stability pass pass pass Breast breaking pass Breast breaking pass Is there any 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 waterborne acrylic coatings; while the N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester has an anti-freeze-thaw effect in waterborne acrylic coatings. The N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and the N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester have a good synergistic effect, providing both anti-freeze-thaw and anti-flash rust effects in waterborne acrylic coatings. The comparative example uses diethanolamine and triethanolamine, but lacks hydrophobic segments, and can only improve the anti-freeze-thaw effect, but cannot improve the anti-flash rust effect.

[0085] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. Use of an anti-icing and anti-spalling adjuvant in an aqueous acrylic paint, characterized in that: The antifreeze and anti-flash rust additives include 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 and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester is 1:(0.5~1.5). Each 100 parts by weight of the waterborne acrylic coating contains 5 to 20 parts by weight of the antifreeze and anti-flash rust additive.

2. The application according to claim 1, characterized in that: The molar ratio of N-hydroxyethyl-2-aminopropionic acid hydroxyethyl ester and N,N-dihydroxyethyl-2-aminopropionic acid hydroxyethyl ester is 1:(0.8~1.2).

3. The application according to claim 1, characterized in that: The method for preparing the antifreeze and anti-flash rust additive includes: reacting ethanolamine and diethanolamine with hydroxyethyl acrylate via a Michael addition reaction to obtain the antifreeze and anti-flash rust additive.

4. A water-based acrylic coating, characterized in that: Includes the antifreeze and anti-flash rust additive as described in any one of claims 1 to 3.

5. The water-based acrylic coating according to claim 4, characterized in that: The waterborne acrylic coating further includes waterborne acrylic resin, fillers, pigments, film-forming aids and water, and optionally, defoamers, thickeners, anti-settling agents and dispersants.

6. The water-based acrylic coating according to claim 5, characterized in that: The waterborne acrylic coating comprises the following raw materials in parts by weight: 40-45 parts waterborne acrylic resin, 25-35 parts filler, 5-20 parts of the aforementioned antifreeze and anti-flash rust additive, 5-10 parts pigment, 2-3 parts film-forming aid, 0.5-1 part defoamer, 0.1-1 part thickener, 0.1-1 part anti-settling agent, 0.5-1.5 parts dispersant, and the balance being water, totaling 100 parts by weight.

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

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

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

10. The application of the waterborne acrylic coating according to any one of claims 4 to 8 in material protection.