A waterborne amino-acrylate baking paint, its preparation method and application

Abstract

The application discloses a kind of water-based acrylic amino baking varnish and preparation method and application thereof.The water-based acrylic amino baking varnish of the application includes the following components: water-based hydroxyl acrylic acid dispersion, water-based anticorrosive paste, film-forming aid, pH regulator, adhesion promoter, anti-flash rust aid, thickening agent, curing agent and water, the water-based anticorrosive paste includes the following components: precipitated barium sulfate, mica powder, aluminum tripolyphosphate, strontium polyphosphate hydrate, carbon black, dispersant, defoaming agent, wetting agent, thickening agent and water, and the curing agent is compounded from high imino high methyl etherified melamine resin and blocked aliphatic isocyanate according to mass ratio 1-3:1.The water-based acrylic amino baking varnish of the application has the advantages of low VOC content, simple preparation method, low production cost, etc., and the crosslinking density of paint film after film formation is high, the physical and mechanical properties are excellent, the corrosion resistance is excellent, and it can be used for the corrosion protection of steel structure, and is suitable for large-scale industrial application.

Description

Technical Field

[0001] This invention relates to the field of water-based metallic baking paint technology, specifically to a water-based acrylic amino baking paint, its preparation method, and its application. Background Technology

[0002] Traditional solvent-based acrylic-amino baking varnishes release large amounts of toxic and harmful gases during production and application, polluting the environment and endangering the health of construction workers. In recent years, with increasingly stringent environmental regulations and heightened public awareness of environmental protection, water-based acrylic-amino baking varnishes with low VOC content have gradually become a research hotspot in the industry, showing promising market prospects. However, existing water-based acrylic-amino baking varnishes generally suffer from low crosslinking density and poor corrosion resistance after film formation, making it difficult to fully meet practical application requirements.

[0003] Therefore, it is of great significance to develop a water-based acrylic amino baking paint with high crosslinking density, excellent physical and mechanical properties, and excellent corrosion resistance after film formation. Summary of the Invention

[0004] The purpose of this invention is to provide a water-based acrylic amino baking paint, its preparation method, and its application.

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

[0006] A water-based acrylic amino baking varnish comprises the following components in weight percentages:

[0007] Aqueous hydroxyacrylic acid dispersion: 40%–55%;

[0008] Water-based anti-corrosion pigments: 14%–40%;

[0009] Film-forming aids: 6%–10%;

[0010] pH adjuster: 0.3%–0.5%;

[0011] Adhesion promoter: 1%–2%;

[0012] Anti-flash rust additive: 0.3%–0.5%;

[0013] Thickener: 0.4%–1%;

[0014] Hardener: 8%–12%;

[0015] Water: Balance;

[0016] The water-based anti-corrosion pigment comprises the following components by weight percentage:

[0017] Precipitated barium sulfate: 24%–29%;

[0018] Mica powder: 5%–8%;

[0019] Aluminum tripolyphosphate: 8%–12%;

[0020] Strontium aluminum polyphosphate hydrate: 11%–15%;

[0021] Carbon black slurry: 15%–18%;

[0022] Dispersant: 1.5%–2.5%;

[0023] Defoamer: 0.7%–1.3%;

[0024] Wetting agent: 0.5%–0.9%;

[0025] Thickener: 0.2%–0.4%;

[0026] Water: Balance;

[0027] The curing agent is a compound of high imino-high methyl etherified melamine resin and blocked aliphatic isocyanate in a mass ratio of 1 to 3:1.

[0028] Preferably, the hydroxyl content of the aqueous hydroxyl acrylic dispersion is 3% to 4%.

[0029] More preferably, the aqueous hydroxy acrylic dispersion is aqueous hydroxy acrylic dispersion 2136H from Guangzhou Liangu Fine Chemical Co., Ltd. (hydroxyl content 3.5%, VOC content 100g / L~150g / L). Compared with commonly used water-soluble resins (VOC content usually 250g / L~350g / L), aqueous hydroxy acrylic dispersion 2136H not only has a lower VOC content, but also produces a film with high gloss and flexibility after film formation.

[0030] Preferably, the film-forming aid is at least one of propylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol butyl ether, and dodecyl alcohol ester.

[0031] Preferably, the pH adjuster is at least one of N,N-dimethylethanolamine (DMEA) and 2-amino-2-methyl-1-propanol (AMP-95).

[0032] More preferably, the pH adjuster is N,N-dimethylethanolamine. N,N-dimethylethanolamine can not only adjust the pH value, but also act as a catalyst to accelerate the curing rate.

[0033] Preferably, the adhesion promoter is at least one of epoxy phosphate type adhesion promoter and polyester phosphate type adhesion promoter.

[0034] More preferably, the adhesion promoter is epoxy phosphate type adhesion promoter 25046 from Jiangxi Longhai Chemical Co., Ltd.

[0035] Preferably, the anti-flash rust additive is an organozinc chelate anti-flash rust additive.

[0036] More preferably, the anti-flash rust additive is anti-flash rust additive 340A from Jiangxi Longhai Chemical Co., Ltd. (the main component is an organic zinc chelate, which does not contain nitrite).

[0037] Preferably, the thickener is a polyurethane associative thickener.

[0038] More preferably, the thickener is polyurethane associative thickener 6299 from Jinan Chennuo Chemical Co., Ltd.

[0039] Preferably, the precipitated barium sulfate is precipitated barium sulfate M-101A from Yunfu Hongzhi New Materials Co., Ltd.

[0040] Preferably, the mica powder is HY-TM1 mica powder from Shenzhen Haiyang Powder Technology Co., Ltd.

[0041] Preferably, the aluminum tripolyphosphate is aluminum tripolyphosphate APW-II from Jiangsu Hesanhong Nanotechnology Co., Ltd.

[0042] Preferably, the aluminum strontium polyphosphate hydrate is SAPP aluminum strontium polyphosphate from German company Hybo.

[0043] Preferably, the carbon black paste is water-based carbon black paste BK9007-SI from Index Pigment Technology Co., Ltd.

[0044] Preferably, the dispersant is a polyether-modified siloxane dispersant.

[0045] More preferably, the dispersant is TEGO 760W.

[0046] Preferably, the defoamer is an organosilicon defoamer.

[0047] More preferably, the defoamer is defoamer DF910D (main component is polysiloxane copolymer) from Foshan Shunde Caiqi Chemical Co., Ltd.

[0048] Preferably, the wetting agent is an organosilicon wetting agent.

[0049] More preferably, the wetting agent is RG4100 (the main component of which is a polysiloxane copolymer) from Jiangsu Changzhou Rongguan Chemical Co., Ltd.

[0050] Preferably, the high-imino, high-methyl etherified melamine resin is high-imino, high-methyl etherified melamine resin 325 from Guangzhou Jiafucheng Materials Technology Co., Ltd.

[0051] Preferably, the blocked aliphatic isocyanate is ET6664, a blocked aliphatic isocyanate from Silicon Carbide Cat (Guangzhou) Technology Co., Ltd.

[0052] A method for preparing a water-based acrylic amino baking paint as described above includes the following steps:

[0053] 1) Disperse the dispersant, defoamer and wetting agent evenly with water, then add precipitated barium sulfate, mica powder, aluminum tripolyphosphate, strontium aluminum polyphosphate hydrate and carbon black, then add thickener to adjust the viscosity of the system, then add glass microspheres and grind until the fineness of the slurry is less than 20μm, filter, and obtain water-based anti-corrosion color paste.

[0054] 2) Mix the water-based hydroxy acrylic dispersion, water-based anti-corrosion pigment, film-forming aid, pH adjuster, adhesion promoter, anti-flash rust aid, curing agent and water evenly, then add thickener to adjust the viscosity of the system, filter, and the water-based acrylic amino baking paint is obtained.

[0055] Preferably, the dispersion method in step 1) is mechanical stirring.

[0056] Preferably, the mechanical stirring is carried out at a mixer speed of 500 r / min to 1000 r / min.

[0057] Preferably, the grinding in step 1) is carried out at a grinding mill speed of 2000 r / min to 3000 r / min.

[0058] Preferably, the mixing method in step 2) is mechanical stirring.

[0059] Preferably, the mechanical stirring is carried out at a mixer speed of 500 r / min to 1000 r / min.

[0060] Application of a water-based acrylic amino baking paint as described above in the corrosion protection of steel structures.

[0061] The beneficial effects of the present invention are: the water-based acrylic amino baking paint of the present invention has the advantages of low VOC content, simple preparation method and low production cost, and the paint film after film formation has high crosslinking density, excellent physical and mechanical properties and excellent corrosion resistance. It can be used for corrosion protection of steel structures and is suitable for large-scale industrial application.

[0062] Specifically:

[0063] 1) The water-based acrylic amino baking paint of the present invention contains a curing agent composed of high imino-high methyl etherified melamine resin and blocked aliphatic isocyanate. The synergistic effect between the two components improves the physical and mechanical properties of the paint film and significantly enhances the paint film's resistance to media.

[0064] 2) The water-based acrylic amino baking paint of the present invention contains a water-based anti-corrosion pigment composed of precipitated barium sulfate, mica powder, aluminum tripolyphosphate, strontium aluminum polyphosphate hydrate and carbon black slurry. The interaction between various pigments and fillers greatly improves the paint film's resistance to neutral salt spray and liquid media.

[0065] 3) The water-based acrylic amino baking paint of the present invention has a low VOC content, and its preparation method is simple and the production cost is low. It meets the basic requirements of water-based anti-corrosion coatings for steel structures and can play a good decorative and protective role for metal products. Detailed Implementation

[0066] The present invention will be further explained and described below with reference to specific embodiments.

[0067] Example 1:

[0068] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0069] Table 1. Composition of a water-based acrylic amino baking varnish

[0070]

[0071]

[0072] Note:

[0073] The composition of water-based anti-corrosion pigments is shown in the table below:

[0074] Table 2 Composition of Water-Based Anticorrosive Pigments

[0075] Precipitated Barium Sulfate M-101A 26.5 Mica Powder HY-TM1 6.5 Aluminum tripolyphosphate APW-II 10 SAPP (Strontium aluminum polyphosphate) 13 Waterborne carbon black paste BK9007-SI 16.5 Dispersant TEGO 760W 2 Defoamer DF910D 1 wetting agent RG4100 0.7 Polyurethane Associative Thickener 6299 0.3 water 23.5

[0076] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0077] 1) Mix dispersant TEGO 760W, defoamer DF910D, wetting agent RG4100 and water, and stir for 5 minutes at 700 r / min in a mixer. Then add precipitated barium sulfate M-101A, mica powder HY-TM1, aluminum tripolyphosphate APW-II, aluminum strontium polyphosphate hydrate SAPP and water-based carbon black paste BK9007-SI. Add polyurethane associative thickener 6299 to adjust the viscosity of the system. After adding glass microspheres, grind the paste at 2500 r / min in a grinder until the fineness of the paste is less than 20 μm. Filter to obtain water-based anti-corrosion color paste.

[0078] 2) Mix waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, blocked aliphatic isocyanate ET6664 and water, and then stir for 15 minutes at a speed of 800 r / min in a mixer. Then add polyurethane associative thickener 6299 to adjust the viscosity of the system, filter, and the waterborne acrylic amino baking paint is obtained.

[0079] Example 2:

[0080] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0081] Table 3. Composition of a water-based acrylic amino baking varnish

[0082]

[0083] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0084] A mixture of waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, blocked aliphatic isocyanate ET6664, and water is mixed and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, waterborne acrylic amino baking paint is obtained.

[0085] Example 3:

[0086] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0087] Table 4. Composition of a water-based acrylic amino baking varnish

[0088]

[0089]

[0090] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0091] A mixture of waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, blocked aliphatic isocyanate ET6664, and water is mixed and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, waterborne acrylic amino baking paint is obtained.

[0092] Example 4:

[0093] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0094] Table 5. Composition of a water-based acrylic amino baking varnish

[0095]

[0096]

[0097] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0098] Aqueous hydroxy acrylic dispersion 2136H, aqueous anti-corrosion colorant, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino-high methyl etherified melamine resin 325, and blocked aliphatic isocyanate ET6664 were mixed and stirred for 15 minutes at 800 rpm. Polyurethane associative thickener 6299 was then added to adjust the viscosity of the system. After filtration, the water-based acrylic amino baking paint was obtained. Comparative Example 1:

[0099] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0100] Table 6. Composition of a water-based acrylic amino baking varnish

[0101]

[0102] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0103] A mixture of waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, and water is prepared and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, waterborne acrylic amino baking paint is obtained.

[0104] Comparative Example 2:

[0105] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0106] Table 7. Composition of a water-based acrylic amino baking varnish

[0107]

[0108] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0109] A mixture of waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, blocked aliphatic isocyanate ET6664, and water is mixed and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, waterborne acrylic amino baking paint is obtained.

[0110] Comparative Example 3:

[0111] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0112] Table 8. Composition of a water-based acrylic amino baking varnish

[0113]

[0114]

[0115] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0116] A mixture of waterborne hydroxy acrylic dispersion 2136H, waterborne anti-corrosion pigment, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, blocked aliphatic isocyanate ET6664, and water is mixed and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, waterborne acrylic amino baking paint is obtained.

[0117] Comparative Example 4:

[0118] A water-based acrylic amino baking paint, the composition of which is shown in the table below:

[0119] Table 9. Composition of a water-based acrylic amino baking varnish

[0120]

[0121]

[0122] The preparation method of the above-mentioned water-based acrylic amino baking paint is as follows:

[0123] Aqueous hydroxy acrylic dispersion 2136H, propylene glycol methyl ether, diethylene glycol butyl ether, N,N-dimethylethanolamine, defoamer DF910D, wetting agent RG4100, epoxy phosphate type adhesion promoter 25046, anti-flash rust additive 340A, high imino high methyl etherified melamine resin 325, blocked aliphatic isocyanate ET6664 and water are mixed and stirred for 15 minutes at a speed of 800 r / min. Then, polyurethane associative thickener 6299 is added to adjust the viscosity of the system. After filtration, the water-based acrylic amino baking paint is obtained.

[0124] Performance testing:

[0125] The water-based acrylic amino baking paints of Examples 1-4 and Comparative Examples 1-4 were sprayed onto the sanded tinplate, then baked in an oven at 80°C for 5-10 minutes, and then baked in a forced-air dryer at 150°C for 30 minutes to obtain a paint film with a thickness of 30μm ± 2μm (the paint film thickness was measured according to "GB / T 13452.2-2008 Paint and Varnish Film Thickness"). Performance tests were then conducted, and the results are shown in the table below.

[0126] Table 10 Performance test results of waterborne acrylic amino baking paints of Examples 1-4 and Comparative Examples 1-4

[0127]

[0128] Note:

[0129] Surface finish: Visual inspection;

[0130] 60° gloss: The test was conducted in accordance with "GB / T 9754-2007 Determination of 20°, 60° and 85° specular gloss of paint films without metallic pigments".

[0131] Adhesion: Tested according to "GB / T 9286-2021 Paints and Varnishes Cross-cut Test";

[0132] Hardness: The test was conducted in accordance with "GB / T 6739-2006 Determination of Hardness of Paints and Varnishes by Pencil Method";

[0133] Impact resistance: Tested according to "GB / T 1732-2020 Test Method for Impact Resistance of Coating Film";

[0134] Resistance to liquid media / 5% NaCl solution: Test according to "GB / T 9274-1988 Determination of resistance to liquid media for varnishes and paints";

[0135] Resistance to neutral salt spray: Tested according to "GB / T 1771-2007 Determination of resistance to neutral salt spray of paints and varnishes".

[0136] As shown in Table 10:

[0137] 1) The pigment-to-binder ratios of the water-based acrylic amino baking varnishes in Examples 1 to 4 are different. As the pigment-to-binder ratio increases, the specular reflection ability of the paint film gradually weakens and the gloss decreases.

[0138] 2) The pigment-to-binder ratios of the waterborne acrylic amino baking varnishes in Examples 1 to 4 are different. When the pigment-to-binder ratio is less than 0.8, the mechanical properties of the paint film do not change much, but its resistance to liquid media is reduced due to the influence of pinholes. When the pigment-to-binder ratio is greater than 0.8, the pigments and fillers play a certain reinforcing role in the system, and the hardness of the paint film increases to 2H. However, the porosity inside the paint film increases, the resistance to external corrosive media is weakened, and the resistance to liquid media and neutral salt spray is reduced.

[0139] 3) The pigment-to-binder ratios of the water-based acrylic amino baking varnishes in Examples 1-4 are different. When the pigment-to-binder ratio is 0.8, the paint film surface is smooth and flat, the interior is relatively dense, the coating between the resin and the pigments and fillers is good, and the performance is relatively excellent. Its adhesion is grade 0, its hardness is 2H, and its impact strength reaches 50 kg·cm. 2 It has the best overall decorative and protective effects, with resistance to neutral salt spray and liquid media for 500 hours and 720 hours respectively.

[0140] 4) Compared with the waterborne acrylic amino baking paint of Comparative Example 1 (only high-imino-high-methyl-etherified melamine resin 325 added) and Comparative Example 2 (only blocked aliphatic isocyanate ET6664 added), the waterborne acrylic amino baking paint of Example 3 (with added high-imino-high-methyl-etherified melamine resin 325 added) has superior gloss, hardness, resistance to liquid media and resistance to neutral salt spray. This indicates that high-imino-high-methyl-etherified melamine resin 325 and blocked aliphatic isocyanate ET6664 have a synergistic effect in the paint film (high-imino-high-methyl-etherified melamine resin 325 can ensure the hardness and strength of the paint film, while blocked aliphatic isocyanate ET6664 has excellent internal elasticity and gloss retention, which can effectively improve the gloss and mechanical properties of the paint film). The presence of both significantly improves the performance of the paint film.

[0141] 5) Compared with the water-based acrylic amino baking paint of Example 3, the amount of water-based hydroxy acrylic dispersion 2136H and curing agent in Comparative Example 3 was reduced. Due to the decrease in film-forming ability, the paint film showed an orange peel phenomenon on the surface. Correspondingly, the viscosity of the paint liquid was low, resulting in uneven dispersion of pigments and fillers, which could not completely coat the resin to form a complete and continuous paint film. The coating crosslinking degree was insufficient, and the mechanical properties and impact resistance were poor.

[0142] 6) Comparative Example 4's waterborne acrylic amino baking paint served as a blank control group for the waterborne acrylic amino baking paint of Example 3. No pigments or fillers were added. Since the paint film was not affected by the matting effect of pigments and fillers, it exhibited high gloss. Its mechanical properties were consistent with those of the paint film formed by the waterborne acrylic amino baking paint of Example 3. However, its resistance to neutral salt spray and liquid media was far inferior to that of the paint film formed by the waterborne acrylic amino baking paint of Example 3. This is because pigments and fillers can use their own physical properties or chemical activity to inhibit corrosion, thereby improving the corrosion resistance of the paint film.

[0143] 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 acrylic amino baking paint, characterized in that, Includes the following components by mass percentage: Aqueous hydroxyacrylic acid dispersion: 40%–55%; Water-based anti-corrosion pigments: 14%–40%; Film-forming aids: 6%–10%; pH adjuster: 0.3%–0.5%; Adhesion promoter: 1%–2%; Anti-flash rust additive: 0.3%~0.5%; Thickener: 0.4%–1%; Hardener: 8%–12%; Water: Balance; The water-based anti-corrosion pigment comprises the following components by weight percentage: Precipitated barium sulfate: 24%–29%; Mica powder: 5%–8%; Aluminum tripolyphosphate: 8%–12%; Strontium aluminum polyphosphate hydrate: 11%–15%; Carbon black slurry: 15%–18%; Dispersant: 1.5%–2.5%; Defoamer: 0.7%–1.3%; Wetting agent: 0.5%–0.9%; Thickener: 0.2%–0.4%; Water: Balance; The aqueous hydroxy acrylic acid dispersion is aqueous hydroxy acrylic acid dispersion 2136H from Guangzhou Liangu Fine Chemical Co., Ltd. The curing agent is a compound of high imino-high methyl etherified melamine resin and blocked aliphatic isocyanate in a mass ratio of 1 to 3:

1. The blocked aliphatic isocyanate is ET6664, a blocked aliphatic isocyanate from Silicon Carbide Cat (Guangzhou) Technology Co., Ltd.

2. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The film-forming aid is at least one of propylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol butyl ether, and dodecyl alcohol ester.

3. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The pH adjuster is at least one of N,N-dimethylethanolamine and 2-amino-2-methyl-1-propanol.

4. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The adhesion promoter is at least one of epoxy phosphate type adhesion promoter and polyester phosphate type adhesion promoter.

5. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The anti-flash rust additive is an organozinc chelate anti-flash rust additive.

6. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The thickener is a polyurethane associative thickener.

7. The water-based acrylic amino baking varnish according to claim 1, characterized in that: The dispersant is a polyether-modified siloxane dispersant; the defoamer is an organosilicon defoamer; and the wetting agent is an organosilicon wetting agent.

8. A method for preparing a water-based acrylic amino baking varnish as described in any one of claims 1 to 7, characterized in that, Includes the following steps: 1) Disperse the dispersant, defoamer and wetting agent evenly with water, then add precipitated barium sulfate, mica powder, aluminum tripolyphosphate, strontium aluminum polyphosphate hydrate and carbon black slurry, then add thickener to adjust the viscosity of the system, then add glass microspheres and grind until the fineness of the slurry is less than 20μm, filter, and obtain water-based anti-corrosion color paste. 2) Mix the water-based hydroxy acrylic dispersion, water-based anti-corrosion pigment, film-forming aid, pH adjuster, adhesion promoter, anti-flash rust aid, curing agent and water evenly, then add thickener to adjust the viscosity of the system, filter, and the water-based acrylic amino baking paint is obtained.

9. The application of a water-based acrylic amino baking paint as described in any one of claims 1 to 7 in the corrosion protection of steel structures.

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