Auxiliaries, waterborne acrylic coating and its preparation method and application

Abstract

The application discloses an auxiliary agent, a water-based acrylic coating and a preparation method and application thereof. The water-based acrylic coating comprises the water-based acrylic anti-freezing and anti-flash rust auxiliary agent. The auxiliary agent comprises a dihydroxy carboxylic acid and a strong alkaline substance. The auxiliary agent has the characteristics of a polyol in structure and also has a carboxylate. The auxiliary agent can be used as an auxiliary dispersion and wetting agent. When the auxiliary agent is applied to a water-based acrylic coating system, the auxiliary agent has the functions of auxiliary wetting dispersion, anti-freezing and anti-flash rust. The freezing and thawing stability and the anti-flash rust property of the water-based acrylic coating are solved. In addition, a pH regulator and an anti-flash rust agent do not need to be additionally added in the formula of the water-based acrylic primer, and the amount of a dispersant is reduced.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to additives, waterborne acrylic coatings, their preparation methods and applications. Background Technology

[0002] Water-based acrylic anti-corrosion paints are widely used in fields such as light corrosion protection, machinery, and equipment. Water-based coatings use water as the dispersion medium, and water's freezing point is 0°C. Therefore, the freeze-thaw stability of water-based acrylic anti-corrosion paints is crucial during winter construction.

[0003] Currently, the method to address the freeze-thaw stability of waterborne acrylic coatings from a formulation perspective is to add antifreeze. Commercially available antifreeze is mainly divided into two categories: the first category is polyols (easily soluble in water), such as propylene glycol and glycerol; the second category 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; polyols have a lower freezing point than water, and the addition of polyol-based antifreeze agents can lower the overall freezing point of the solution. The second is chemical interaction; 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 improves freeze-thaw stability is still not fully understood. Surfactants generally have dispersing, wetting, and even thickening effects. Therefore, when adding surfactant-based antifreeze to water-based coatings, they can also be used as wetting and dispersing agents or thickeners; or they can act as both wetting and dispersing agents and antifreeze agents; thickeners (alkali-soluble thickeners of acrylic emulsion type) have antifreeze effects.

[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, used to react emulsion monomers to 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 incorporating surfactant-type antifreeze into acrylic emulsions during synthesis: one method uses the surfactant-type antifreeze 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 as a reactive emulsifier or reactive feedstock in the acrylic acid polymerization reaction.

[0009] Currently, polyol-based antifreeze agents generally have limited functionality. While surfactant-based antifreeze agents offer both antifreeze and flash rust prevention, no additives have yet been found that combine both. Summary of the Invention

[0010] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the object of the present invention is to provide additives, waterborne acrylic coatings, methods for their preparation, and applications.

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

[0012] In a first aspect, the present invention provides an aqueous acrylic antifreeze and anti-flash rust additive, comprising dihydroxycarboxylic acid and a strong alkaline substance.

[0013] In some embodiments of the present invention, the molar ratio of the carboxylic acid group to the strong base substance in the dihydroxycarboxylic acid is 1:1 to 1.5, such as 1:1 to 1.3, 1:1 to 1.2, 1:1 to 1.1, 1:1.025 to 1.1, etc.

[0014] In some embodiments of the present invention, the dihydroxycarboxylic acid includes at least one of dihydroxymethylacetic acid, dihydroxymethylpropionic acid, dihydroxymethylbutyric acid, dihydroxysuccinic acid, dihydroxymethylvalerate, and dihydroxysuccinic acid.

[0015] In some embodiments of the present invention, the dihydroxycarboxylic acid includes at least one of 2,2-dihydroxymethylhexanoic acid, 2,2-dihydroxymethylpropionic acid, 2,2-dihydroxymethylbutyric acid, 2,2-dihydroxymethylvalerate, and 2,3-dihydroxysuccinic acid.

[0016] In some embodiments of the present invention, the strong alkaline substance includes at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, lithium hydroxide, cesium hydroxide, choline, and quaternary ammonium bases.

[0017] In a second aspect, the present invention provides a water-based acrylic coating comprising the aforementioned water-based acrylic antifreeze and anti-flash rust additive.

[0018] 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.

[0019] In waterborne acrylic coatings, a certain amount of surfactant needs to be added during the acrylic emulsion polymerization process to stabilize the synthesized waterborne acrylic resin. Simultaneously, in the selection of monomers for synthesizing the acrylic emulsion, acrylic acid is added and neutralized with alkali, resulting in the formation of a large amount of carboxylates, which improves the hydrophilicity and stability of the acrylic emulsion. For waterborne acrylic coating systems, using only surfactant-type antifreeze without a dispersant is insufficient for stabilizing the system. This is because surfactant-type antifreeze cannot completely disperse the powder and form a homogeneous system, easily causing powder particles to agglomerate and precipitate. The principle by which dispersants stably and uniformly disperse powder in the system is twofold: one is the charge repulsion stabilization of the electric double layer; the other is the synergistic effect of anchoring groups and hydrophilic groups. After the hydrophilic groups are solvated, the powder is stabilized through steric hindrance. Therefore, whether it is the powder particles coated by the dispersant or the latex particles in the acrylic emulsion, their surfaces will have an electric double layer or a solvated layer with hydrophilic groups solvated; or both. Surfactants operate in a dynamic process within a system; a surfactant molecule may be at point A one moment and at point B the next. If the amount of dispersant is insufficient, a complete electric double layer and solvation layer cannot be formed. During the surfactant's movement, insufficient surfactant to stabilize and disperse the powder particles leads to particle aggregation due to insufficient repulsive forces or steric hindrance, thus compromising stability. In this invention, the waterborne acrylic coating does not contain pH adjusters or antifreeze systems such as antifreeze agents and freeze-thaw stabilizers. The dihydroxycarboxylic acid and strong alkaline substances are uniformly distributed in the system. Both the surface of the powder particles coated by the dispersant and the surface of the latex particles contain a large number of hydrophilic groups. These hydrophilic groups form numerous hydrogen bonds with the hydroxyl groups and carboxylate ions in the dihydroxycarboxylate formed by the dihydroxycarboxylic acid and strong alkaline substances. These hydrogen bonds firmly bind the dihydroxycarboxylate, causing it to adhere to the surface of the powder particles and latex particles coated by the dispersant, increasing the electric double layer and solvation layer, and increasing the repulsive forces and steric hindrance between each dispersed powder particle. Simultaneously, the stability of the powder and the latex particles is improved, which means the stability of the water-based acrylic coating is improved. On the other hand, after the amount of dispersant or surfactant in the whole system is reduced, there are a large number of pores in the double electric layer or solvation layer between the powder particles. The powder particles or latex particles coated by the dispersant have anions such as carboxylate ions on their own surface. These surface hydrophilic groups can also be firmly combined with the dihydroxycarboxylate salt formed by dihydroxycarboxylic acid and strong alkaline substances and exist in the above-mentioned pores, thereby expanding the double electric layer and / or solvation layer.However, directly adding dihydroxycarboxylic acid to waterborne acrylic coating systems will cause a significant drop in the system's pH, falling below 7, changing the system from alkaline to acidic, leading to demulsification. If an alkaline substance is added first, followed by dihydroxycarboxylic acid, the pH will be too high after adding the strong alkaline substance, causing the latex particles to become highly ionized, increasing hydrophilicity, and resulting in rapid swelling and a rapid increase in viscosity, accompanied by demulsification. Directly adding dihydroxycarboxylic acid cannot effectively maintain the alkalinity of the system, nor can it increase the pH value of the coating, resulting in weak system stability and no anti-flash rust properties. Therefore, neutralizing the dihydroxycarboxylic acid with a strong alkaline substance and maintaining an excess of the strong alkaline substance, while keeping the waterborne acrylic coating system alkaline, can improve the system's stability, increase the pH value of the coating, reduce the reaction rate of the electrochemical corrosion reaction, and improve the coating's anti-flash rust properties. Finally, the water-based acrylic antifreeze and anti-flash rust additive of the present invention is distributed in the coating. When it comes into contact with water, it can form a large number of hydrogen bonds. Hydrogen bonds can reduce the ability of water molecules to form ice crystals, destroy the hydrogen bond network between water molecules, affect the crystallization of water molecules, lower the freezing point, and thus improve the freeze-thaw stability of the coating system.

[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, 3-20 parts of the aforementioned waterborne acrylic 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, 0.01-0.5 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, 5-15 parts the aforementioned waterborne acrylic antifreeze and anti-flash rust additive, 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, 0.03-0.1 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 2052, Badifu's 3616, 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 polymeric dispersants, such as Gaotai 790, Dow 731A, Shenzhu Chemical SN-1798, and BYK-190.

[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, the water-based acrylic antifreeze and anti-flash rust additive, water-based 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 water-based acrylic antifreeze and flash rust inhibitor of this invention is readily soluble in water, has the structural characteristics of polyols, and also contains carboxylates. It can be used as an auxiliary dispersant and wetting agent. When applied to water-based acrylic coating systems, it simultaneously provides auxiliary wetting and dispersion, antifreeze, and flash rust prevention, solving the freeze-thaw stability and flash rust prevention issues of water-based acrylic coatings. At the same time, the formulation of water-based acrylic primers does not require the addition of pH adjusters and flash rust inhibitors, reducing the amount of dispersant used. 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 describes the preparation of a water-based acrylic antifreeze and anti-flash rust additive, the specific process of which is as follows:

[0042] Add 100g of water to a beaker, and while stirring magnetically, add 1 mol of 2,2-dimethylolpropionic acid (DMPA), followed by 41g of sodium hydroxide powder. Stir until homogeneous to obtain the multifunctional additive. The molar ratio of 2,2-dimethylolpropionic acid (DMPA) to sodium hydroxide is 1:1.025.

[0043] Example 2

[0044] This embodiment describes the preparation of a water-based acrylic antifreeze and anti-flash rust additive, the specific process of which is as follows:

[0045] Add 100g of water to a beaker, and while stirring magnetically, add 1 mol of dimethylolbutyric acid (DMBA), followed by 42g of sodium hydroxide powder. Stir until homogeneous to obtain the multifunctional additive. The molar ratio of DMBA to sodium hydroxide is 1:1.05.

[0046] Example 3

[0047] This embodiment describes the preparation of a water-based acrylic antifreeze and anti-flash rust additive, the specific process of which is as follows:

[0048] Add 100g of water to a beaker, and while stirring magnetically, add 1 mol of a mixture of 2,2-dimethylolpropionic acid (DMPA) and dimethylolbutyric acid (DMBA) (molar ratio 1:1), then add 44g of sodium hydroxide powder. Stir until homogeneous to obtain the multifunctional additive. The molar ratio of the mixture to sodium hydroxide is 1:1.1.

[0049] Example 4

[0050] This embodiment describes the preparation of a water-based acrylic antifreeze and anti-flash rust additive, the specific process of which is as follows:

[0051] Add 100g of water to a beaker, and while stirring magnetically, add a mixture of 1 mol of 2,2-dimethylolpropionic acid (DMPA) and dimethylolbutyric acid (DMBA) (molar ratio 1:1), then add 41g of sodium hydroxide powder. Stir until homogeneous to obtain the multifunctional additive. The molar ratio of the mixture to sodium hydroxide is 1:1.025.

[0052] Example 5

[0053] This embodiment describes the preparation of a water-based acrylic antifreeze and anti-flash rust additive, the specific process of which is as follows:

[0054] Add 100g of water to a beaker, and while stirring magnetically, add a mixture of 1 mol of 2,2-dimethylolpropionic acid (DMPA) and dimethylolbutyric acid (DMBA) (molar ratio 3:1), followed by a certain amount of sodium hydroxide powder. Stir until homogeneous to obtain the multifunctional additive. The molar ratio of the mixture to sodium hydroxide is 1:1.05.

[0055] Example 6

[0056] This embodiment prepares a water-based acrylic coating, and the specific process is as follows:

[0057] Add 5 parts water, 0.1 parts anti-settling agent, 0.05 parts dispersant, 6 parts of the additives prepared in Example 1, 45 parts water-based acrylic resin, 0.5 parts defoamer, 5 parts pigment, 35 parts filler, 3 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.

[0058] 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; the waterborne acrylic resin is Henghe Yongsheng 2052; the pigment is Shandong Dongjia titanium dioxide SR237; 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.

[0059] Example 7

[0060] This embodiment prepares a water-based acrylic coating, and the specific process is as follows:

[0061] Add the following ingredients sequentially to a dispersion tank: 10 parts water, 0.3 parts anti-settling agent, 0.05 parts dispersant, 15 parts additives prepared in Example 2, 40 parts waterborne acrylic resin, 0.8 parts defoamer, 6 parts pigment, 25 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 waterborne acrylic coating.

[0062] Among them, the anti-settling agent is Ashland's hydroxyethyl cellulose 3KB; the defoamer is DIGIC's 901W; the waterborne acrylic resin is BADEFU's 3616; 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.

[0063] Example 8

[0064] This embodiment prepares a water-based acrylic coating, and the specific process is as follows:

[0065] Add 15 parts water, 0.5 parts anti-settling agent, 0.05 parts dispersant, 5 parts of the additives prepared in Example 3, 40.7 parts waterborne acrylic resin, 1 part defoamer, 10 parts pigment, 25 parts filler, 2.5 parts film-forming aid, and 0.3 parts thickener to a dispersion tank in sequence. Stir at high speed until homogeneous, and filter through a 200-mesh screen to obtain the waterborne acrylic coating.

[0066] Among them, the anti-settling agent is Huihong Chemical's polyamide wax 7022; the dispersant is Gaotai's 790; the defoamer is BYK-024 from BYK Chemical; the waterborne acrylic resin is Wanhua Chemical's 0628; 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.

[0067] Example 9

[0068] This embodiment prepares a water-based acrylic coating, and the specific process is as follows:

[0069] Add 5 parts water, 0.1 parts anti-settling agent, 6 parts additives prepared in Example 4, 45 parts water-based acrylic resin, 0.5 parts defoamer, 5 parts pigment, 35 parts filler, 3 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 screen to obtain water-based acrylic coating.

[0070] Among them, the anti-settling agent is polyamide wax 7022 from Huihong Chemical; the defoamer is BYK-024 from BYK Chemical; the water-based acrylic resin is 0628 from Wanhua Chemical; 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 alkali-soluble thickener H-120 from Puwei low-shear.

[0071] Comparative Example 1

[0072] This comparative example prepared a water-based acrylic coating, and the specific process is as follows:

[0073] Add the following ingredients sequentially to a dispersion tank: 15 parts water, 0.5 parts anti-settling agent, 0.05 parts dispersant, 42 parts water-based acrylic resin, 1 part defoamer, 10 parts pigment, 28.5 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 water-based acrylic coating.

[0074] 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; the waterborne acrylic resin is Henghe Yongsheng 2052; the pigment is Shandong Dongjia titanium dioxide SR237; 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.

[0075] Comparative Example 2

[0076] This comparative example prepared a water-based acrylic coating, and the specific process is as follows:

[0077] Add the following ingredients sequentially to a dispersion tank: 10 parts water, 0.5 parts anti-settling agent, 5 parts dispersant, 42 parts water-based acrylic resin, 1 part defoamer, 10 parts pigment, 28.5 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 water-based acrylic coating.

[0078] 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; the waterborne acrylic resin is Henghe Yongsheng 2052; the pigment is Shandong Dongjia titanium dioxide SR237; 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.

[0079] Test case

[0080] This experimental example tests the performance of water-based acrylic coatings. The specific procedure is as follows:

[0081] The sedimentation test method is as follows: The finished coating is uniformly thickened to a viscosity of 80-85 kcal, and then subjected to heat storage at 50°C for one month. Observe for any hardening, sedimentation, or gelation. If any of these occur, the test fails.

[0082] Freeze-thaw stability test method: The finished coating is placed in a -5℃ freezer for 16 hours, then left at room temperature for 8 hours. This constitutes one cycle, and a total of three cycles are tested. Observe whether there is any demulsification or mud-like phenomenon; if so, it fails the test.

[0083] Flash rust resistance test method: The finished coating is sprayed onto a standard sandblasted plate (150*70*3mm) with an air spray, and the wet film thickness is 100 microns. Then it is placed in a standard curing environment (relative humidity 50±5%RH, temperature 23±2℃) and observed for flash rust.

[0084] The test results are shown in Table 1.

[0085] Table 1

[0086] Whether it settles no no no Hard and heavy Hard and heavy no freeze-thaw stability pass pass pass pass Breast breaking pass Is there any rust? no no no no yes yes

[0087] 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. The application of antifreeze and anti-flash rust additives in water-based acrylic coatings, characterized in that, The antifreeze and anti-flash rust additive includes dihydroxycarboxylic acid and a strong alkaline substance, wherein the dihydroxycarboxylic acid and the strong alkaline substance neutralize and maintain an excess of the strong alkaline substance; the molar ratio of the carboxylic acid group to the strong alkaline substance in the dihydroxycarboxylic acid is 1:1.025~1.5; the dihydroxycarboxylic acid is at least one of dimethylolpropionic acid, dimethylolbutyric acid or dimethylolvalerate.

2. The application according to claim 1, characterized in that: The molar ratio of the carboxylic acid group to the strong base substance in the dihydroxycarboxylic acid is 1:1.025~1.

3.

3. The application according to claim 1, characterized in that: The strongly alkaline substance includes at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, lithium hydroxide, cesium hydroxide, and quaternary ammonium bases.

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, 3-20 parts antifreeze and anti-flash rust additive as described in any one of claims 1-4, 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, 0.01-0.5 parts dispersant, and the balance being water, wherein the total parts by weight of the waterborne acrylic resin, filler, antifreeze and anti-flash rust additive, pigment, and water are 96 parts.

7. The waterborne acrylic coating according to claim 5, characterized in that: The waterborne acrylic resin has a solid content of 45% to 49% and a minimum film-forming temperature of 20°C to 28°C.

8. The water-based acrylic coating according to claim 5, characterized in that: The film-forming aid includes at least one of the following: alcohol ester twelve, alcohol ester sixteen, propylene glycol phenyl ether, propylene glycol butyl ether, and dipropylene glycol butyl ether.

9. 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, lithopone, 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 defoamer includes a polyether-modified silicone defoamer; (IV) The thickener includes a polyurethane thickener or an alkali-soluble thickener; (V) The anti-settling agent includes at least one of bentonite, hydroxyethyl cellulose, and polyamide wax.

10. The application of the waterborne acrylic coating according to any one of claims 4 to 9 in material protection.