A water-based matt industrial anticorrosive paint, a preparation method and application thereof

Abstract

The application discloses a kind of water-based matte industrial anticorrosive paint and its preparation method and application.The components of the water-based matte industrial anticorrosive paint of the application include self-mattifying acrylic acid modified water-based alkyd resin, polyurethane modified water-based alkyd resin, titanium white, precipitated barium sulfate, drier, defoaming agent, dispersant, thickening agent, pH regulator, anti-settling agent, corrosion inhibitor and water.The preparation method of the water-based matte industrial anticorrosive paint of the application is very simple, and the components are mixed uniformly in batches to obtain the paint.The gloss of the paint film formed by the water-based matte industrial anticorrosive paint of the application can be quickly adjusted, and the paint film has stable gloss, good weather resistance, good corrosion resistance and strong decoration.The preparation method is simple, and the paint is suitable for large-scale industrial production and application.

Description

Technical Field

[0001] This invention relates to the field of industrial anti-corrosion technology, specifically to a water-based matte industrial anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] Anti-corrosion coatings provide protection for substrates, extending their service life, and are widely used in industrial corrosion protection. Compared to solvent-based coatings, water-based coatings effectively reduce volatile organic compound (VOC) emissions and the generation of harmful waste, and are expected to completely replace solvent-based coatings in the future. Currently, with the increasing emphasis on environmental protection and health, the development of water-based industrial anti-corrosion coatings is becoming increasingly mature. In the field of industrial anti-corrosion coatings, in order to reduce the gloss of the paint film and improve its matte finish, smooth feel, and wear and scratch resistance, the following methods are commonly used to reduce the gloss of the paint film: 1) Increasing the pigment-to-binder ratio in the coating formulation. This method easily leads to a decrease in the anti-corrosion and weather resistance of the paint film; 2) Adding raw materials with matting effects (e.g., silica, matting wax, matting powder, etc.). These raw materials are prone to sedimentation and uneven dispersion, resulting in defects such as brittleness and excessive differences in surface gloss of the paint film; 3) Using self-matting resin as the main film-forming substance. This method does not require the addition of external matting agents, but achieves the effect of micro-roughness on the paint film surface by controlling the polymerization process. It does 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 waterborne matte industrial anti-corrosion coating with excellent comprehensive performance based on self-matting resin. Summary of the Invention

[0004] The purpose of this invention is to provide a water-based matte industrial anti-corrosion coating, its preparation method, and its application.

[0005] The technical solution adopted in this invention is:

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

[0007] Self-matte acrylic modified waterborne alkyd resin: 30%–60%;

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

[0009] Titanium dioxide: 10%–25%;

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

[0011] Drying agent: 0.2%–0.8%;

[0012] Defoamer: 0.1%–0.2%;

[0013] Dispersant: 0.3%–0.7%;

[0014] Thickener: 0.2%–1%;

[0015] pH adjuster: 0.1%–0.3%;

[0016] Anti-settling agent: 0.2%–1%;

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

[0018] Water: Balance.

[0019] Preferably, a water-based matte industrial anti-corrosion coating comprises the following components by weight percentage:

[0020] Self-matte acrylic modified waterborne alkyd resin: 40%–55%;

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

[0022] Titanium dioxide: 15%–25%;

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

[0024] Drying agent: 0.3%–0.6%;

[0025] Defoamer: 0.1%–0.2%;

[0026] Dispersant: 0.4%–0.7%;

[0027] Thickener: 0.3%–0.6%;

[0028] pH adjuster: 0.1%–0.3%;

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

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

[0031] Water: Balance.

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

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

[0034] 1) Mix vegetable oil fatty acids, polyols, diacids and xylene, react at 180℃~240℃ until the acid value is <20mgKOH / g, then cool down to 170℃~190℃, add diacids containing double bonds and react until the acid value is <10mgKOH / g, then cool down to ≤150℃, add diluent to dilute, and obtain alkyd resin prepolymer;

[0035] 2) Mix acrylic monomers, waterborne acrylic monomers, initiators and ethylene glycol monobutyl ether to form a mixture. Take a portion of the mixture and react it at 100℃~120℃. Then slowly add the remaining mixture and alkyd resin prepolymer. After the addition is complete, keep the reaction at the temperature and add an additional initiator. Then cool down to ≤80℃ and add a neutralizer to neutralize, thus obtaining the self-matte acrylic modified waterborne alkyd resin.

[0036] Preferably, the mass percentage of each material (vegetable oil fatty acids, polyols, diacids, and diacids containing double bonds) in step 1) is as follows:

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

[0038] Polyols: 10%–30%;

[0039] Dicarboxylic acid: 15%–25%;

[0040] Dicarboxylic acids containing double bonds: 1%–10%.

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

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

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

[0044] Preferably, the polybasic acid containing double bonds 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 waterborne acrylic monomer) in step 2) is as follows:

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

[0048] Acrylic monomers: 35%–55%;

[0049] Waterborne acrylic monomers: 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 waterborne 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 benzoyl peroxide (BPO), tert-butyl peroxide-2-ethylhexanoate (TBPO), tert-amyl peroxide acetate (TAPB), and tert-butyl peroxide (TBPB).

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

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

[0055] Preferably, step 2) includes: mixing acrylic monomers, water-based acrylic monomers, initiators, and ethylene glycol monobutyl ether to form a mixture; taking a portion of the mixture and reacting it at 100℃~120℃ for 1.5h~2.5h; then slowly adding the remaining mixture and alkyd resin prepolymer, controlling the addition time to 2h~6h; after the addition is complete, maintaining the temperature for 1.5h~2.5h, adding an initiator, then cooling to ≤80℃, and adding a neutralizing agent for neutralization.

[0056] Preferably, the polyurethane-modified waterborne alkyd resin is at least one of the following: polyurethane-modified waterborne alkyd resin 9288 (solid content of 39% to 40%) from Zhuhai Wanli New Material Technology Co., Ltd., and PUA-1642 waterborne polyurethane dispersion (solid content of 39% to 40%) from 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 defoamer 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 organobentonite, magnesium aluminum silicate, and polyamide wax.

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

[0064] A method for preparing a water-based matte industrial anti-corrosion coating as described above includes the following steps: mixing a portion of self-matte acrylic modified water-based alkyd resin, defoamer, dispersant, pH adjuster, anti-settling agent and water, then adding titanium dioxide and precipitated barium sulfate and grinding to a fineness ≤30μm, then adding the remaining self-matte acrylic modified water-based alkyd resin, polyurethane modified water-based alkyd resin, drier and corrosion inhibitor and mixing, then adding a thickener to adjust the viscosity, thus obtaining the water-based matte industrial anti-corrosion coating.

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

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

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

[0068] Specifically:

[0069] 1) The waterborne matte industrial anti-corrosion coating of the present invention can achieve different gloss levels by adjusting the addition ratio of self-matting acrylic modified waterborne alkyd resin and polyurethane modified waterborne alkyd resin in the coating without changing the pigment-to-binder ratio (PVC) of the coating. The coating film has stable gloss, good weather resistance and corrosion resistance, which solves the problems of unstable gloss caused by the direct introduction of matting powder in existing waterborne matte industrial anti-corrosion coatings or the decrease in corrosion resistance and weather resistance caused by changing the pigment-to-binder ratio of the coating.

[0070] 2) The self-matte acrylic modified waterborne alkyd resin in the waterborne matte industrial anti-corrosion coating of the present invention is a polymer with acrylic acid as the core and acrylic acid-alkyd copolymer as the shell. During the resin drying and film formation process, the hydrophobic long alkyl chains of vegetable oil fatty acids can cause uneven shrinkage of the paint film on the paint film surface to form a rough surface, thereby achieving self-matte finish of the paint film.

[0071] 3) The water-based matte industrial anti-corrosion 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 to a variety of substrates, is odorless and environmentally friendly, dries quickly, and has adjustable gloss, high stability, strong decorative properties, good weather resistance and good anti-corrosion properties. Attached Figure Description

[0073] Figure 1 The infrared spectrum of the self-masking acrylic modified waterborne alkyd resin in Example 1 is shown. Detailed Implementation

[0074] The present invention will be further explained and described below with reference to specific embodiments.

[0075] Example 1:

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

[0077] Table 1. Composition of a water-based matte industrial anti-corrosion coating

[0078]

[0079] Note:

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

[0081] 1) Add 314g of soybean oil fatty acids, 151.5g of trimethylolpropane, 120.5g of phthalic anhydride and 30g of xylene to a 1L four-necked flask equipped with a stirrer, thermometer, condenser and oil-water separator. Stir at 180℃ for 1h, then raise the temperature to 240℃ and stir until the acid value is <20mgKOH / g. Then lower the temperature to 170℃, add 13.5g of maleic anhydride and stir until the acid value is <10mgKOH / g. Then lower the temperature to 150℃ and add ethylene glycol monobutyl ether to dilute to a solid content of 75% to obtain alkyd resin prepolymer.

[0082] 2) Mix 100g of styrene, 100g of butyl methacrylate, 20g of acrylic acid, and 8g of benzoyl peroxide to form a mixture. Add 30wt% of the mixture to a 1L four-necked flask and stir at 120℃ for 2 hours. Then, slowly add the remaining mixture and 200g of alkyd resin prepolymer dropwise to the four-necked flask over a period of 4 hours. After the addition is complete, keep the mixture warm and stir for 2 hours. Add 0.8g of benzoyl peroxide twice more, stirring for 2 hours each time. Then, cool the mixture to 80℃ and add triethylamine to neutralize it until the pH of the reaction solution is 7-8. This yields the self-matte acrylic acid modified waterborne alkyd resin.

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

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

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

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

[0087] In summary, this embodiment has indeed successfully synthesized a self-matting acrylic modified waterborne alkyd resin (core-shell structure polymer, with an acrylic core and an acrylic-alkyd copolymer) with the expected structure and composition.

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

[0089] Mix 60wt% of self-matte acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant BYK-190, N,N-dimethyldiethanolamine, magnesium aluminum silicate, and deionized water until homogeneous. Then add titanium dioxide R595 and precipitated barium sulfate and mix until homogeneous. Grind the mixture using a sand mill until the fineness is ≤30μm. Add the remaining self-matte acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat 1101 iron drier, and rust inhibitor NALZINFA 179 and mix until homogeneous. Finally, add thickener Borchi Gel 0620 to adjust the viscosity to 90KU~100KU to obtain a waterborne matte industrial anti-corrosion coating.

[0090] Example 2:

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

[0092] Table 2. Composition of a water-based matte industrial anti-corrosion coating

[0093]

[0094]

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

[0096] Mix 60wt% of self-matte acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant TEGO-760W, AMP-95, organic bentonite, and deionized water until homogeneous. Then add titanium dioxide R595 and precipitated barium sulfate and mix until homogeneous. Grind the mixture to a fineness ≤30μm using a sand mill. Add the remaining self-matte acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi Octa-Soligen 421Aqua composite drier, and rust inhibitor NALZIN FA 179 and mix until homogeneous. Finally, add thickener Borchi Gel 0620 to adjust the viscosity to 90KU~100KU to obtain a waterborne matte industrial anti-corrosion coating.

[0097] Example 3:

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

[0099] Table 3. Composition of a water-based matte industrial anti-corrosion coating

[0100]

[0101]

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

[0103] Mix 75wt% of self-matte acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant Dow OROTAN 731A, AMP-95, polyamide wax, and deionized water until homogeneous. Then add titanium dioxide R595 and precipitated barium sulfate and mix until homogeneous. Grind the mixture using a sand mill until the fineness is ≤30μm. Add the remaining self-matte acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat 1101 iron drier, and rust inhibitor NALZIN FA179 and mix until homogeneous. Finally, add thickener Borchi Gel 0620 to adjust the viscosity to 90KU~100KU to obtain a waterborne matte industrial anti-corrosion coating.

[0104] Comparative Example 1:

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

[0106] Table 4. Composition of a water-based industrial anti-corrosion coating

[0107]

[0108]

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

[0110] Mix 60wt% of self-matting acrylic modified waterborne alkyd resin, defoamer BYK-028, dispersant BYK-190, N,N-dimethyldiethanolamine, magnesium aluminum silicate, and deionized water until homogeneous. Then add titanium dioxide R595 and precipitated barium sulfate and mix until homogeneous. Grind the mixture to a fineness ≤30μm using a sand mill. Add the remaining self-matting acrylic modified waterborne alkyd resin, Borchi OXY Coat 1101 iron drier, and rust inhibitor NALZIN FA 179 and mix until homogeneous. Finally, add thickener Borchi Gel 0620 to adjust the viscosity to 90KU~100KU to obtain the waterborne industrial anti-corrosion coating.

[0111] Comparative Example 2:

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

[0113] Table 5. Composition of a water-based industrial anti-corrosion coating

[0114]

[0115] The preparation method of the above-mentioned water-based industrial anti-corrosion 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. Then, titanium dioxide R595 and precipitated barium sulfate are added and stirred evenly. The mixture is then ground to a fineness ≤30μm using a sand mill. Next, polyurethane modified waterborne alkyd resin 9288, Borchi Octa-Soligen 421 Aqua composite drier, and rust inhibitor NALZIN FA 179 are added and stirred evenly. Finally, thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU, thus obtaining the waterborne industrial anti-corrosion coating.

[0117] Comparative Example 3:

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

[0119] Table 6. Composition of a water-based industrial anti-corrosion coating

[0120]

[0121] The preparation method of the above-mentioned water-based industrial anti-corrosion 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. Then, titanium dioxide R595 and precipitated barium sulfate are added and stirred evenly. The mixture is then ground to a fineness ≤30μm using a sand mill. Next, polyurethane modified waterborne alkyd resin 9288, Borchi OXY Coat 1101 iron drier, and rust inhibitor NALZIN FA 179 are added and stirred evenly. Finally, thickener Borchi Gel 0620 is added to adjust the viscosity to 90KU~100KU, thus obtaining the waterborne industrial anti-corrosion coating.

[0123] Performance testing:

[0124] The performance test results of the industrial anti-corrosion coatings in Examples 1-3 and Comparative Examples 1-3 are shown in the table below:

[0125] Table 7 Performance test results of industrial anti-corrosion coatings

[0126]

[0127] Note:

[0128] Gloss, water resistance and thermal storage stability: tested according to "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] As shown in Table 7, the present invention uses self-matting acrylic modified waterborne alkyd resin as the main film-forming substance, resulting in a paint film with low gloss and good uniformity. It is combined with polyurethane modified waterborne alkyd resin 9288 with good compatibility. By 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 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. A water-based matte industrial anti-corrosion coating, characterized in that, Includes the following components by mass percentage: Self-matte acrylic modified waterborne alkyd resin: 40%–50%; Polyurethane-modified waterborne alkyd resin: 5%–15%; Titanium dioxide: 10%–25%; Precipitated barium sulfate: 5%–30%; Drying agent: 0.2%–0.8%; Defoamer: 0.1%–0.2%; Dispersant: 0.3%–0.7%; Thickener: 0.2%–1%; pH adjuster: 0.1%–0.3%; Anti-settling agent: 0.2%–1%; Corrosion inhibitor: 0.1%–0.5%; Water: Balance; The self-matte acrylic modified waterborne alkyd resin is a core-shell structure polymer, with an acrylic acid core and an acrylic acid-alkyd copolymer shell. The self-matte acrylic modified waterborne alkyd resin is prepared by a method including the following steps: 1) Mix vegetable oil fatty acids, polyols, diacids and xylene, react at 180℃~240℃ until the acid value is <20mgKOH / g, then cool down to 170℃~190℃, add diacids containing double bonds and react until the acid value is <10mgKOH / g, then cool down to ≤150℃, add diluent to dilute, and obtain alkyd resin prepolymer; 2) Mix acrylic monomers, waterborne acrylic monomers, initiators and ethylene glycol monobutyl ether to form a mixture. Take a portion of the mixture and react it at 100℃~120℃. Then slowly add the remaining mixture and alkyd resin prepolymer. After the addition is complete, keep the reaction at the temperature and add an initiator. Then cool down to ≤80℃ and add a neutralizer to neutralize. This gives the self-matte acrylic modified waterborne alkyd resin. Step 2) The acrylic monomer is at least one of styrene, methyl methacrylate, butyl acrylate, and butyl methacrylate; Step 2) The water-based acrylic monomer is at least one of acrylic acid and methacrylic acid.

2. The water-based matte industrial anti-corrosion coating according to claim 1, characterized in that: The percentage of each material's mass in step 1) is as follows: Vegetable oil fatty acids: 45%–60%; Polyols: 10%–30%; Dicarboxylic acid: 15%–25%; Dicarboxylic acids containing double bonds: 1%–10%.

3. The water-based matte industrial anti-corrosion coating according to claim 1 or 2, characterized in that: Step 1) The vegetable oil fatty acid is at least one of linseed oil fatty acid, soybean oil fatty acid, sunflower seed oil fatty acid, tall oil fatty acid, and dehydrated castor oil fatty acid; Step 1) The polyol is at least one of glycerol, trimethylolpropane, trimethylolethane, pentaerythritol, and dipentaerythritol; Step 1) The dicarboxylic acid is at least one of phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, adipic acid, octanoic acid, azelaic acid, and sebacic acid; Step 1) The polycarboxylic acid containing a double bond is at least one of maleic anhydride and fumaric acid.

4. The water-based matte industrial anti-corrosion coating according to claim 1, characterized in that: The percentage of each material's mass in step 2) is as follows: Alkyd resin prepolymer: 40%–60%; Acrylic monomers: 35%–55%; Waterborne acrylic monomer: 4%–6%.

5. The water-based matte industrial anti-corrosion coating according to claim 1 or 2, characterized in that: The polyurethane-modified waterborne alkyd resin is at least one of the following: polyurethane-modified waterborne alkyd resin 9288 from Zhuhai Wanli New Material Technology Co., Ltd., and PUA-1642 waterborne polyurethane dispersion from Zhuhai Wanli New Material Technology Co., Ltd.

6. A method for preparing a water-based matte industrial anti-corrosion coating as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Mix a portion of the self-matte acrylic modified waterborne alkyd resin, defoamer, dispersant, pH adjuster, anti-settling agent, and water. Then add titanium dioxide and precipitated barium sulfate and grind until the fineness is ≤30μm. Then add the remaining self-matte acrylic modified waterborne alkyd resin, polyurethane modified waterborne alkyd resin, drier, and corrosion inhibitor and mix well. Finally, add a thickener to adjust the viscosity to obtain a waterborne matte industrial anti-corrosion coating.

7. The application of a water-based matte industrial anti-corrosion coating as described in any one of claims 1 to 5 for metal corrosion protection.

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