Water-based matte industrial anticorrosive paint as well as preparation method and application thereof

Abstract

The invention discloses a water-based matte industrial anticorrosive coating as well as a preparation method and application thereof. The water-based matte industrial anticorrosive paint comprises the following components: self-extinction acrylic acid modified water-based alkyd resin, polyurethane modified water-based alkyd resin, titanium dioxide, precipitated barium sulphate, a drier, a defoaming agent, a dispersing agent, a thickening agent, a pH regulator, an anti-settling agent, a corrosion inhibitor and water. The preparation method of the water-based matte industrial anticorrosive paint is very simple, and the water-based matte industrial anticorrosive paint is obtained by uniformly mixing the components in batches. The glossiness of a paint film formed by the water-based matte industrial anticorrosive paint can be rapidly adjusted, the paint film is stable in glossiness, good in weather resistance, good in corrosion resistance and high in decoration performance, and the preparation method is simple and suitable for large-scale industrial production and application.

Description

Technical Field

[0001] The invention relates to the technical field of industrial anticorrosion, and in particular to a water-based matte industrial anticorrosion coating and a preparation method and application thereof. Background Art

[0002] Anti-corrosion coatings can provide a certain degree of protection for substrates, thereby extending the service life of the substrates. They are widely used in the field of industrial anti-corrosion. Compared with solvent-based coatings, water-based coatings can effectively reduce the emission of volatile organic compounds (VOCs) and the generation of hazardous wastes. In the future, they are expected to completely replace solvent-based coatings. At present, as modern humans pay more and more attention to the environment and health, water-based industrial anti-corrosion coatings are becoming more and more mature. In the field of industrial anti-corrosion coatings, in order to reduce the gloss of the paint film and improve the matte, smooth feel, wear resistance and scratch resistance of the paint film, the following methods are usually used to reduce the gloss of the paint film: 1) Increasing the pigment-to-base ratio of the coating formula. This method is likely to lead to a decrease in the corrosion resistance and weather resistance of the paint film; 2) Adding raw materials with a matting effect (for example: gas silicone, matting wax, matting powder, etc.). These raw materials are prone to sedimentation and uneven dispersion, resulting in defects such as brittle paint film and excessive surface gloss difference; 3) Using self-matting resin as the main film-forming substance. This method does not require the addition of a matting agent, but instead controls the polymerization process to achieve a micro-rough effect on the paint film surface. It will not affect the performance of the paint film itself and has the broadest application prospects.

[0003] Therefore, it is of great significance to develop a water-based matte industrial anti-corrosion coating based on self-matting resin with excellent comprehensive performance. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based matte industrial anticorrosive coating and a preparation method and application thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A water-based matte industrial anti-corrosion coating, comprising the following components in percentage by mass:

[0007] Self-matting acrylic modified waterborne alkyd resin: 30% to 60%;

[0008] Polyurethane modified waterborne alkyd resin: 5% to 30%;

[0009] Titanium dioxide: 10% to 25%;

[0010] Precipitated barium sulfate: 5% to 30%;

[0011] Drier: 0.2%~0.8%;

[0012] Defoaming agent: 0.1%~0.2%;

[0013] Dispersant: 0.3%~0.7%;

[0014] Thickener: 0.2%~1%;

[0015] pH regulator: 0.1% to 0.3%;

[0016] Anti-settling agent: 0.2%~1%;

[0017] Corrosion inhibitor: 0.1% to 0.5%;

[0018] Water: Balance.

[0019] Preferably, a water-based matte industrial anticorrosive coating comprises the following components in percentage by mass:

[0020] Self-matting acrylic modified waterborne alkyd resin: 40% to 55%;

[0021] Polyurethane modified waterborne alkyd resin: 5% to 15%;

[0022] Titanium dioxide: 15% to 25%;

[0023] Precipitated barium sulfate: 5% to 15%;

[0024] Drier: 0.3%~0.6%;

[0025] Defoaming agent: 0.1%~0.2%;

[0026] Dispersant: 0.4%~0.7%;

[0027] Thickener: 0.3%~0.6%;

[0028] pH regulator: 0.1% to 0.3%;

[0029] Anti-settling agent: 0.2%~0.5%;

[0030] Corrosion inhibitor: 0.2%~0.4%;

[0031] Water: Balance.

[0032] Preferably, the self-matting acrylic acid-modified waterborne alkyd resin is a core-shell structure polymer, wherein the core is acrylic acid and the shell is an acrylic acid-alkyd copolymer.

[0033] Preferably, the self-matting acrylic modified waterborne alkyd resin is prepared by a preparation method comprising the following steps:

[0034] 1) Mixing vegetable oil fatty acid, polyol, dibasic acid and xylene, reacting at 180° C. to 240° C. to an acid value of <20 mgKOH / g, then cooling to 170° C. to 190° C., adding dibasic acid containing double bonds to react to an acid value of <10 mgKOH / g, then cooling to a temperature of ≤150° C., adding a diluent to dilute, and obtaining an alkyd resin prepolymer;

[0035] 2) Mixing acrylic monomer, water-based acrylic monomer, initiator and ethylene glycol monobutyl ether to prepare a mixture, taking a portion of the mixture to react at 100° C. to 120° C., slowly adding the remaining mixture and alkyd resin prepolymer, keeping the temperature for reaction after the addition, adding the initiator, cooling to a temperature of ≤80° C., adding a neutralizer for neutralization, and obtaining a matte acrylic modified water-based alkyd resin.

[0036] Preferably, the mass percentage of each material (vegetable oil fatty acid, polyol, dibasic acid and dibasic acid containing double bonds) in step 1) is:

[0037] Vegetable oil fatty acids: 45% to 60%;

[0038] Polyol: 10% to 30%;

[0039] Dibasic acid: 15% to 25%;

[0040] Dibasic acids containing double bonds: 1% to 10%.

[0041] Preferably, the vegetable oil fatty acid in step 1) is at least one of linseed oil fatty acid, soybean oil fatty acid, sunflower oil fatty acid, tall oil fatty acid, and dehydrated castor oil fatty acid.

[0042] Preferably, the polyol in step 1) is at least one of glycerol, trimethylolpropane, trimethylolethane, pentaerythritol and dipentaerythritol.

[0043] Preferably, the dibasic acid in step 1) is at least one of phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, adipic acid, suberic acid, azelaic acid and sebacic acid.

[0044] Preferably, the double-bond-containing polyacid in step 1) is at least one of maleic anhydride and fumaric acid.

[0045] Preferably, the diluent in step 1) is at least one of ethylene glycol monobutyl ether, propylene glycol methyl ether and ethanol.

[0046] Preferably, the mass percentage of each material (alkyd resin prepolymer, acrylic monomer and water-based acrylic monomer) in step 2) is:

[0047] Alkyd resin prepolymer: 40% to 60%;

[0048] Acrylic monomer: 35% to 55%;

[0049] Water-based acrylic monomer: 4%~6%.

[0050] Preferably, the acrylic monomer in step 2) is at least one of styrene, methyl methacrylate, butyl acrylate and butyl methacrylate.

[0051] Preferably, the aqueous acrylic monomer in step 2) is at least one of acrylic acid and methacrylic acid.

[0052] Preferably, the initiator in step 2) is at least one of dibenzoyl peroxide (BPO), tert-butyl peroxy-2-ethylhexanoate (TBPO), tert-amyl peroxyacetate (TAPB), and tert-butyl peroxybenzoate (TBPB).

[0053] Preferably, the mass percentage of the initiator in step 2) is 1% to 3%.

[0054] Preferably, the neutralizing agent in step 2) is at least one of triethylamine (TEA), N,N-dimethylethanolamine (DMEA), and ammonia water.

[0055] Preferably, the operation of step 2) includes: mixing an acrylic monomer, an aqueous acrylic monomer, an initiator and ethylene glycol monobutyl ether to form a mixture, taking a portion of the mixture and reacting it at 100° C. to 120° C. for 1.5 h to 2.5 h, and then slowly dropping the remaining mixture and alkyd resin prepolymer, the dropping time is controlled to be 2 h to 6 h, and after the addition is completed, the reaction is kept warm for 1.5 h to 2.5 h, and the initiator is added, and then the temperature is lowered to ≤80° C., and a neutralizer is added for neutralization.

[0056] Preferably, the polyurethane modified waterborne alkyd resin is at least one of the polyurethane modified waterborne alkyd resin 9288 (solid content of 39% to 40%) of Zhuhai Wanli New Material Technology Co., Ltd. and the PUA-1642 waterborne polyurethane dispersion (solid content of 39% to 40%) of Zhuhai Wanli New Material Technology Co., Ltd.

[0057] Preferably, the drying agent is at least one of Borchi Octa-Soligen 421Aqua composite drying agent and Borchi OXYCoat 1101 iron drying agent.

[0058] Preferably, the defoaming agent is at least one of BYK-028 and TEGO-810.

[0059] Preferably, the dispersant is at least one of BYK-190, TEGO-760W, and Dow OROTAN 731A.

[0060] Preferably, the thickener is at least one of Borchi Gel 0620 and Borchi Gel 0625.

[0061] Preferably, the pH adjuster is at least one of N,N-dimethyldiethanolamine and isobutanolamine.

[0062] Preferably, the anti-settling agent is at least one of organic bentonite, magnesium aluminum silicate and polyamide wax.

[0063] Preferably, the corrosion inhibitor is at least one of the rust inhibitor NALZIN FA 179 from Hemingway and HALOX 750 from HALOX Corporation of the United States.

[0064] A preparation method of the above-mentioned water-based matte industrial anticorrosive coating comprises the following steps: mixing a part of a self-matting acrylic modified water-based alkyd resin, a defoamer, a dispersant, a pH regulator, an anti-settling agent and water, adding titanium dioxide and precipitated barium sulfate and grinding to a fineness of ≤30 μm, adding the remaining self-matting acrylic modified water-based alkyd resin, a polyurethane modified water-based alkyd resin, a drying agent and a corrosion inhibitor and mixing, and adding a thickener to adjust the viscosity to obtain the water-based matte industrial anticorrosive coating.

[0065] Preferably, the target viscosity for adjusting the viscosity is 90KU to 100KU.

[0066] The water-based matte industrial anti-corrosion coating as described above is used for metal anti-corrosion applications.

[0067] The beneficial effects of the present invention are: the glossiness of the paint film formed by the water-based matte industrial anti-corrosion coating of the present invention can be quickly adjusted, the paint film has stable gloss, good weather resistance, good anti-corrosion and strong decorative properties, and the preparation method is simple, which is suitable for large-scale industrial production and application.

[0068] Specifically:

[0069] 1) The water-based matte industrial anticorrosive coating of the present invention can adjust different glossiness by adjusting the addition ratio of the self-matting acrylic acid modified water-based alkyd resin and the polyurethane modified water-based alkyd resin in the coating without changing the pigment-to-base ratio (PVC) of the coating. The paint film has stable gloss, good weather resistance and corrosion resistance, and solves the problem of unstable paint film gloss caused by directly introducing matting powder or the problem of decreased corrosion resistance and weather resistance of the paint film caused by changing the pigment-to-base ratio of the coating in the existing water-based matte industrial anticorrosive coating;

[0070] 2) The self-matting acrylic acid-modified water-based alkyd resin in the water-based matte industrial anticorrosive coating of the present invention is a polymer with acrylic acid as a core and acrylic acid-alkyd copolymer as a shell. During the resin drying and film-forming process, the hydrophobic long alkyl chain of the vegetable oil fatty acid on the surface of the paint film can promote uneven shrinkage of the paint film to form a rough surface, thereby achieving self-matting of the paint film;

[0071] 3) The water-based matte industrial anticorrosive coating of the present invention contains a compounded resin system, which can regulate the spatial network structure of the paint film and improve the density of the paint film;

[0072] 4) The water-based matte industrial anti-corrosion coating of the present invention has good adhesion on the surfaces of various substrates, is odorless, environmentally friendly, dries quickly, has adjustable gloss of the paint film, high stability, strong decorativeness, good weather resistance, and good anti-corrosion properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 This is the infrared spectrum of the self-matting acrylic modified waterborne alkyd resin in Example 1. DETAILED DESCRIPTION

[0074] The present invention will be further explained and illustrated below in conjunction with specific embodiments.

[0075] Embodiment 1:

[0076] A water-based matte industrial anti-corrosion coating, the composition of which is shown in the following table:

[0077] Table 1 Composition of a water-based matte industrial anticorrosive coating

[0078]

[0079] Note:

[0080] The preparation method of self-matting acrylic acid modified waterborne alkyd resin is as follows:

[0081] 1) 314 g of soybean oil fatty acid, 151.5 g of trimethylolpropane, 120.5 g of phthalic anhydride and 30 g of xylene were added to a 1 L four-necked flask equipped with a stirrer, a thermometer, a condenser and an oil-water separator, stirred at 180° C. for 1 h, then heated to 240° C. and stirred under heat until the acid value was <20 mgKOH / g, then cooled to 170° C., 13.5 g of maleic anhydride was added and stirred under heat until the acid value was <10 mgKOH / g, then cooled to 150° C., ethylene glycol monobutyl ether was added and diluted to a solid content of 75%, to obtain an alkyd resin prepolymer;

[0082] 2) 100 g of styrene, 100 g of butyl methacrylate, 20 g of acrylic acid and 8 g of dibenzoyl peroxide were mixed to prepare a mixture, and 30 wt % of the mixture was added to a 1 L four-necked flask, and stirred at 120° C. for 2 h. The remaining mixture and 200 g of alkyd resin prepolymer were pre-mixed and then slowly added dropwise to the four-necked flask, and the dropping time was controlled to 4 h. After the addition, the mixture was stirred for 2 h at a temperature of 4 h. Dibenzoyl peroxide was added twice, and each time 0.8 g of dibenzoyl peroxide was added. The mixture was cooled to 80° C., and triethylamine was added to neutralize the reaction solution until the pH value was 7-8, thereby obtaining a matte acrylic acid-modified waterborne alkyd resin.

[0083] The infrared spectrum of the self-matting acrylic modified waterborne alkyd resin in this embodiment is as follows: Figure 1 shown.

[0084] Depend on Figure 1 It can be seen that:

[0085] Characteristic peak of acrylate: 1732cm -1 (Acrylate carbonyl C=O) and 1170 cm -1 ~1165cm -1 (COC of acrylates), while alkyds also contain these two functional groups, which mostly overlap;

[0086] Characteristic peak of styrene: 701cm -1 and 761cm -1 (monosubstituted benzene ring), 1493cm -1 (benzene ring skeleton), 3004cm -1 、3026cm -1 、3060cm -1 and 3082cm -1 (benzene ring CH);

[0087] In summary, the self-matting acrylic modified waterborne alkyd resin (core-shell structure polymer, the core is acrylic acid, the shell is acrylic acid-alkyd copolymer) with the expected structure and composition was indeed synthesized in this example.

[0088] The preparation method of the above-mentioned water-based matte industrial anticorrosive coating is as follows:

[0089] A self-matting acrylic modified waterborne alkyd resin with a formula amount of 60wt%, a defoamer BYK-028, a dispersant BYK-190, N,N-dimethyldiethanolamine, magnesium aluminum silicate and deionized water are mixed evenly, titanium dioxide R595 and precipitated barium sulfate are added and mixed evenly, and then ground with a sand mill to a fineness of ≤30μm, and then the remaining self-matting acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat 1101 iron drier and rust inhibitor NALZINFA 179 are added and mixed evenly, and then a thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU to obtain a waterborne matte industrial anticorrosive coating.

[0090] Embodiment 2:

[0091] A water-based matte industrial anti-corrosion coating, the composition of which is shown in the following table:

[0092] Table 2 Composition of a water-based matte industrial anticorrosive coating

[0093]

[0094]

[0095] The preparation method of the above-mentioned water-based matte industrial anticorrosive coating is as follows:

[0096] A self-matting acrylic modified waterborne alkyd resin with a formula amount of 60wt%, a defoamer BYK-028, a dispersant TEGO-760W, an AMP-95, an organic bentonite and deionized water are mixed evenly, titanium dioxide R595 and precipitated barium sulfate are added and mixed evenly, and then ground with a sand mill to a fineness of ≤30μm, and then the remaining self-matting acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi Octa-Soligen 421Aqua composite drier and rust inhibitor NALZIN FA 179 are added and mixed evenly, and then a thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU-100KU to obtain a waterborne matte industrial anticorrosive coating.

[0097] Embodiment 3:

[0098] A water-based matte industrial anti-corrosion coating, the composition of which is shown in the following table:

[0099] Table 3 Composition of a water-based matte industrial anticorrosive coating

[0100]

[0101]

[0102] The preparation method of the above-mentioned water-based matte industrial anticorrosive coating is as follows:

[0103] A self-matting acrylic modified waterborne alkyd resin with a formula amount of 75wt%, a defoamer BYK-028, a dispersant Dow OROTAN 731A, AMP-95, a polyamide wax and deionized water are stirred evenly, titanium dioxide R595 and precipitated barium sulfate are added and stirred evenly, and then ground with a sand mill to a fineness of ≤30μm, and then the remaining self-matting acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat 1101 iron drier and rust inhibitor NALZIN FA179 are added and stirred evenly, and then a thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU to obtain a waterborne matte industrial anticorrosive coating.

[0104] Comparative Example 1:

[0105] A water-based industrial anti-corrosion coating, the composition of which is shown in the following table:

[0106] Table 4 Composition of a water-based industrial anticorrosive coating

[0107]

[0108]

[0109] The preparation method of the above-mentioned water-based industrial anticorrosive coating is as follows:

[0110] A self-matting acrylic modified waterborne alkyd resin with a formula amount of 60wt%, a defoamer BYK-028, a dispersant BYK-190, N,N-dimethyldiethanolamine, magnesium aluminum silicate and deionized water are mixed evenly, titanium dioxide R595 and precipitated barium sulfate are added and mixed evenly, and then ground with a sand mill to a fineness of ≤30μm, and then the remaining self-matting acrylic modified waterborne alkyd resin, Borchi OXY Coat 1101 iron drier and rust inhibitor NALZIN FA 179 are added and mixed evenly, and then a thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU to obtain a waterborne industrial anticorrosive coating.

[0111] Comparative Example 2:

[0112] A water-based industrial anti-corrosion coating, the composition of which is shown in the following table:

[0113] Table 5 Composition of a water-based industrial anticorrosive coating

[0114]

[0115] The preparation method of the above-mentioned water-based industrial anticorrosive coating is as follows:

[0116] The self-matting acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant TEGO-760W, AMP-95, organic bentonite and deionized water are stirred evenly, titanium dioxide R595 and precipitated barium sulfate are added and stirred evenly, and then ground with a sand mill to a fineness of ≤30μm, and then polyurethane modified waterborne alkyd resin 9288, Borchi Octa-Soligen421Aqua composite drying agent and rust inhibitor NALZIN FA 179 are added and stirred evenly, and then thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU to obtain a waterborne industrial anticorrosive coating.

[0117] Comparative Example 3:

[0118] A water-based industrial anti-corrosion coating, the composition of which is shown in the following table:

[0119] Table 6 Composition of a water-based industrial anticorrosive coating

[0120]

[0121] The preparation method of the above-mentioned water-based industrial anticorrosive coating is as follows:

[0122] The self-matting acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant BYK-190, N,N-dimethyldiethanolamine, magnesium aluminum silicate and deionized water are stirred evenly, titanium dioxide R595 and precipitated barium sulfate are added and stirred evenly, and then ground with a sand mill to a fineness of ≤30μm, and then polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat1101 iron drier and rust inhibitor NALZIN FA 179 are added and stirred evenly, and then thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU to obtain a waterborne industrial anticorrosive coating.

[0123] Performance Testing:

[0124] The performance test results of the industrial anticorrosion coatings in Examples 1 to 3 and Comparative Examples 1 to 3 are shown in the following table:

[0125] Table 7 Performance test results of industrial anticorrosion coatings

[0126]

[0127] Note:

[0128] Gloss, water resistance and thermal storage stability: Tested in accordance with "HG / T 4847-2015 Waterborne Alkyd Resin Coatings".

[0129] Salt spray resistance: Tested in accordance with "GB / T 1771-2007 Determination of neutral salt spray resistance of paints and varnishes".

[0130] It can be seen from Table 7 that the present invention adopts self-matting acrylic modified water-based alkyd resin as the main film-forming substance, and the formed paint film has low gloss and good uniformity. It is matched with polyurethane modified water-based alkyd resin 9288 with good compatibility. By independently adjusting the ratio between the two resins, the gloss and corrosion resistance of the paint film can be directionally adjusted, which can effectively improve the water resistance and salt spray performance of the paint film.

[0131] 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 water-based matte industrial anti-corrosion coating, characterized in that: The following components are included in mass percentage: Self-matting acrylic modified waterborne alkyd resin: 30% to 60%; Polyurethane modified waterborne alkyd resin: 5% to 30%; Titanium dioxide: 10% to 25%; Precipitated barium sulfate: 5% to 30%; Drier: 0.2%~0.8%; Defoaming agent: 0.1%~0.2%; Dispersant: 0.3%~0.7%; Thickener: 0.2%~1%; pH regulator: 0.1% to 0.3%; Anti-settling agent: 0.2%~1%; Corrosion inhibitor: 0.1%~0.5%; Water: Balance.

2. The water-based matte industrial anticorrosive coating according to claim 1, characterized in that: The self-matting acrylic acid modified water-based alkyd resin is a core-shell structure polymer, wherein the core is acrylic acid and the shell is an acrylic acid-alkyd copolymer.

3. The water-based matte industrial anticorrosive coating according to claim 2, characterized in that: The self-matting acrylic acid modified waterborne alkyd resin is prepared by a preparation method comprising the following steps: 1) Mixing vegetable oil fatty acid, polyol, dibasic acid and xylene, reacting at 180° C. to 240° C. to an acid value of <20 mgKOH / g, then cooling to 170° C. to 190° C., adding dibasic acid containing double bonds to react to an acid value of <10 mgKOH / g, then cooling to a temperature of ≤150° C., adding a diluent to dilute, and obtaining an alkyd resin prepolymer; 2) Mixing acrylic monomer, water-based acrylic monomer, initiator and ethylene glycol monobutyl ether to prepare a mixture, taking a portion of the mixture to react at 100° C. to 120° C., slowly adding the remaining mixture and alkyd resin prepolymer, keeping the temperature for reaction after the addition, adding the initiator, cooling to a temperature of ≤80° C., adding a neutralizer for neutralization, and obtaining a matte acrylic modified water-based alkyd resin.

4. The water-based matte industrial anticorrosive coating according to claim 3, characterized in that: The mass percentage of each material in step 1) is: Vegetable oil fatty acids: 45% to 60%; Polyol: 10% to 30%; Dibasic acid: 15% to 25%; Dibasic acids containing double bonds: 1% to 10%.

5. The water-based matte industrial anticorrosive coating according to claim 3 or 4, characterized in that: The vegetable oil fatty acid in step 1) is at least one of linseed oil fatty acid, soybean oil fatty acid, sunflower oil fatty acid, tall oil fatty acid, and dehydrated castor oil fatty acid; the polyol in step 1) is at least one of glycerol, trimethylolpropane, trimethylolethane, pentaerythritol, and dipentaerythritol; the dibasic acid in step 1) is at least one of phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, adipic acid, suberic acid, azelaic acid, and sebacic acid; the double-bond-containing polyacid in step 1) is at least one of maleic anhydride and fumaric acid.

6. The water-based matte industrial anticorrosive coating according to claim 3, characterized in that: The mass percentage of each material in step 2) is: Alkyd resin prepolymer: 40% to 60%; Acrylic monomer: 35% to 55%; Water-based acrylic monomer: 4%~6%.

7. The water-based matte industrial anticorrosive coating according to claim 3 or 6, characterized in that: The acrylic monomer in step 2) is at least one of styrene, methyl methacrylate, butyl acrylate and butyl methacrylate; the water-based acrylic monomer in step 2) is at least one of acrylic acid and methacrylic acid.

8. The water-based matte industrial anticorrosive coating according to any one of claims 1 to 4, characterized in that: The polyurethane modified waterborne alkyd resin is at least one of the polyurethane modified waterborne alkyd resin 9288 of Zhuhai Wanli New Material Technology Co., Ltd. and the PUA-1642 waterborne polyurethane dispersion of Zhuhai Wanli New Material Technology Co., Ltd.

9. A method for preparing a water-based matte industrial anticorrosive coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: Mix part of the self-matting acrylic modified water-based alkyd resin, defoamer, dispersant, pH adjuster, anti-settling agent and water, add titanium dioxide and precipitated barium sulfate and grind to a fineness of ≤30μm, add the remaining self-matting acrylic modified water-based alkyd resin, polyurethane modified water-based alkyd resin, drying agent and corrosion inhibitor and mix, then add thickener to adjust the viscosity to obtain a water-based matte industrial anti-corrosion coating.

10. Use of the water-based matte industrial anticorrosion coating according to any one of claims 1 to 8 for metal anticorrosion.

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