A waterproof and corrosion-resistant one-component waterborne paint

Abstract

The present invention relates to a one-component waterborne paint with waterproof and corrosion-resistant properties, belonging to the technical field of waterborne coatings. Based on the benzene ring structure of tannic acid containing multiple adjacent hydroxyl groups, the present invention creatively modifies it. First, a waterborne hydroxyl acrylic emulsion and tannic acid are reacted to overcome the problem that tannic acid itself has poor compatibility with polymer resins. Then, the silane coupling agent is hydrolyzed to form Si-OH bonds, which then undergo a condensation reaction with the hydroxyl groups on tannic acid to prepare an adhesion promoter that can improve adhesion. Since the adhesion promoter of the present invention contains a large number of hydroxyl groups, a large number of hydrogen bonds can be formed with the surface of the substrate. At the same time, the double bonds of tannic acid and the double bonds of the silane coupling agent can both participate in the curing and film-forming of the one-component waterborne paint to form a molecular bridge. Therefore, the adhesion to various substrates is increased, promoting adhesion, and it is not easy to crack, detach, etc., improving the waterproof and corrosion-resistant properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterborne coatings, and particularly relates to a one-component waterborne paint with waterproof and corrosion-resistant properties. Background Art

[0002] One-component waterborne paints are widely used in fields such as construction, automobiles, railways, pipelines, and bridge structures. Compared with solvent-based paints, waterborne paints use water as a solvent, saving a large amount of resources. They can be directly applied and constructed on wet surfaces and in humid environments during use. They not only have good surface adaptability to materials but also can effectively reduce the emission of volatile organic pollutants during the construction process, being very environmentally friendly.

[0003] Nowadays, waterborne acrylic paints are often used as one-component waterborne paints for construction in the market. Due to many advantages such as fast film formation and easy use, they have received increasing attention. However, when existing waterborne acrylic paints are in use, the adhesion on different substrates often varies greatly, and situations such as cracking and stickiness at high temperatures are likely to occur, thereby resulting in poor waterproof and corrosion-resistant effects, leading to their overall comprehensive performance not being high and not being able to meet market demands well.

[0004] Therefore, there are still many defects when the current waterborne acrylic paints are used as one-component waterborne paints, and improvement is urgently needed. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a one-component waterborne paint with waterproof and corrosion-resistant properties. The present invention creatively takes the benzene ring structure of tannic acid containing multiple adjacent hydroxyl groups as the basis and modifies it. First, a waterborne hydroxyl acrylic emulsion and tannic acid are reacted to overcome the problem that tannic acid itself has poor compatibility with polymer resins. Then, the silane coupling agent is hydrolyzed to form Si-OH bonds and then undergoes a condensation reaction with the hydroxyl groups on tannic acid to prepare an adhesion promoter that can improve adhesion. Since the adhesion promoter of the present invention contains a large number of hydroxyl groups, a large number of hydrogen bonds can be formed with the surface of the substrate. At the same time, the double bonds of tannic acid and the double bonds of the silane coupling agent can both participate in the curing and film formation of the one-component waterborne paint to form a molecular bridge. Therefore, the adhesion to each substrate is increased, promoting adhesion, and it is not easy to occur situations such as cracking and detachment, improving the waterproof and corrosion-resistant performance.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A one-component waterborne paint with waterproof and corrosion-resistant properties. The one-component waterborne paint is prepared from 40 - 100 parts by weight of a waterborne hydroxyl acrylic emulsion, 10 - 20 parts by weight of a waterborne color paste, 10 - 20 parts by weight of deionized water, 1 - 2 parts by weight of a waterborne wetting agent, 3 - 5 parts by weight of a film-forming aid, 2 - 3 parts by weight of a waterborne corrosion inhibitor, 3 - 5 parts by weight of an adhesion promoter, 1 - 2 parts by weight of polyethylene glycol, and 0.5 - 2 parts by weight of a waterborne polyurethane thickener.

[0008] As a preferred technical solution of the present invention, the waterborne color paste is composed of a mixture of deionized water, titanium dioxide, talc powder, mica powder, barium sulfate, rust-inhibiting pigment, and a waterborne dispersant.

[0009] As a preferred technical solution of the present invention, the waterborne wetting agent is a polyether-modified silicone.

[0010] As a preferred technical solution of the present invention, the film-forming aid is at least one of dodecyl alcohol ester, dipropylene glycol butyl ether, dipropylene glycol methyl ether, and diethylene glycol butyl ether.

[0011] As a preferred technical solution of the present invention, the waterborne corrosion inhibitor is at least one of triethanolamine oleate, diethanolamine, and benzotriazole.

[0012] As a preferred technical solution of the present invention, the adhesion promoter is prepared through the following steps:

[0013] Step a: Mix 8 - 10 parts by weight of tannic acid and 5 - 7 parts by weight of a waterborne hydroxyl acrylic emulsion, and stir at room temperature for 5 - 10 min to obtain solution a;

[0014] Step b: Add 0.5 - 1 part by weight of pyridine and 10 - 20 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 200 - 300 W for 10 - 15 min to obtain solution b;

[0015] Step c: React solution b at a temperature of 70 - 90 °C with stirring for 6 - 8 h to obtain solution c;

[0016] Step d: Add 0.5 - 1 part by weight of massive metallic platinum to solution c, and then dropwise add 5 - 7 parts by weight of a silane coupling agent while stirring at 40 - 45 °C. After the dropping is completed, continue to stir and react for 1 - 2 h, and then filter to obtain solution d;

[0017] Step e: Subject solution d to vacuum distillation at 120 - 130 °C for 30 - 45 min to remove volatiles, and thus the preparation is completed.

[0018] Further, the dropping speed in step d is controlled at 1 - 3 drops / s.

[0019] Furthermore, the silane coupling agent described in step d is at least one of silane coupling agent A-171 and silane coupling agent KH-570.

[0020] A preparation method of a waterproof and corrosion-resistant one-component waterborne paint, the preparation method comprising the following steps:

[0021] (1) Mix the waterborne hydroxyl acrylic emulsion, waterborne color paste, deionized water, film-forming aid, waterborne corrosion inhibitor and adhesion promoter, and stir at room temperature for 5-10 min to obtain solution A;

[0022] (2) Under the action of microwave, stir and mix the waterborne wetting agent and polyethylene glycol for 5-10 min to obtain solution B;

[0023] (3) Mix solution A and solution B, stir at room temperature for 5-10 min, then add a waterborne polyurethane thickener, continue to stir for 20-30 min, and filter to complete the preparation.

[0024] Furthermore, the power of the microwave in step (2) is 400-500 W.

[0025] Advantages of the present invention:

[0026] (1) Based on the benzene ring structure of tannic acid containing multiple adjacent hydroxyl groups, the present invention creatively modifies it. First, the waterborne hydroxyl acrylic emulsion and tannic acid are used for reaction to overcome the problem that tannic acid itself has poor compatibility with polymer resins. Then, the silane coupling agent is hydrolyzed to form Si-OH bonds, and then undergoes a condensation reaction with the hydroxyl groups on tannic acid to prepare an adhesion promoter that can improve adhesion. Since the adhesion promoter of the present invention contains a large number of hydroxyl groups, a large number of hydrogen bonds can be formed with the surface of the substrate. At the same time, the double bonds of tannic acid and the silane coupling agent can both participate in the curing and film formation of the one-component waterborne paint to form a molecular bridge. Therefore, the adhesion to each substrate is increased, the adhesion is promoted, and it is not easy to crack or detach, improving the waterproof and corrosion-resistant performance.

[0027] (2) Compared with the silane coupling agent in the prior art, the adhesion promoter prepared by the present invention has more active groups. It can not only form intermolecular forces with the strong polar groups in the one-component waterborne paint, but also be well applicable to the adhesion under different substrates to promote adhesion, with stronger universality. At the same time, it overcomes the problem of poor stability of the silane coupling agent itself, extends the constructible duration of the waterborne paint, and does not become sticky even when used at high temperatures, which can well meet the market demand.

[0028] (3) The present invention also blends polyethylene glycol and a water-based wetting agent under the action of microwave. Both are surfactants and can synergistically enhance the effect, promoting the leveling property of the one-component water-based paint of the present invention during application, reducing the occurrence of pores, pits, etc. during application, forming a smooth surface, and thus further improving the waterproof and corrosion-resistant performance. Detailed Embodiments

[0029] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with embodiments, details the specific embodiments, structures, features and their effects of the present invention as follows.

[0030] Example 1

[0031] A one-component water-based paint with waterproof and corrosion-resistant properties, the one-component water-based paint is prepared from 40 parts by weight of a water-based hydroxyl acrylic emulsion, 10 parts by weight of a water-based color paste, 10 parts by weight of deionized water, 1 part by weight of a water-based wetting agent, 3 parts by weight of a film-forming aid, 2 parts by weight of a water-based corrosion inhibitor, 3 parts by weight of an adhesion promoter, 1 part by weight of polyethylene glycol and 0.5 part by weight of a water-based polyurethane thickener.

[0032] The water-based color paste is composed of a mixture of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of an anti-rust pigment and 2 parts by weight of a water-based dispersant. Among them, the anti-rust pigment consists of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the water-based dispersant is preferably sodium polyacrylate.

[0033] The water-based wetting agent is a polyether-modified silicone.

[0034] The film-forming aid is lauryl alcohol ester.

[0035] The water-based corrosion inhibitor is triethanolamine oleate.

[0036] The adhesion promoter is prepared through the following steps:

[0037] Step a: Mix 8 parts by weight of tannic acid and 5 parts by weight of a water-based hydroxyl acrylic emulsion, and stir at room temperature for 5 min to obtain solution a;

[0038] Step b: Add 0.5 part by weight of pyridine and 10 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 200 W for 10 min to obtain solution b;

[0039] Step c: React solution b at a temperature of 70 °C with stirring for 6 h to obtain solution c;

[0040] Step d: Add 0.5 parts by weight of massive metallic platinum into solution c, then dropwise add 5 parts by weight of silane coupling agent while stirring at 40°C. After the dropping is completed, continue stirring for 1 h for reaction, and then filter to obtain solution d;

[0041] Step e: Distill solution d under reduced pressure at 120°C for 30 min to remove volatiles, thus completing the preparation.

[0042] The dropping speed in step d is controlled at 1 drop / s.

[0043] The silane coupling agent in step d is silane coupling agent A-171.

[0044] A preparation method of a waterproof and corrosion-resistant one-component waterborne paint, the preparation method comprising the following steps:

[0045] (1) Mix an aqueous hydroxy acrylic emulsion, an aqueous color paste, deionized water, a film-forming aid, an aqueous corrosion inhibitor and an adhesion promoter, and stir at room temperature for 5 min to obtain solution A;

[0046] (2) Under the action of microwave, stir and mix an aqueous wetting agent and polyethylene glycol for 5 min to obtain solution B;

[0047] (3) Mix solution A and solution B, stir at room temperature for 5 min, then add an aqueous polyurethane thickener, continue stirring for 20 min, and filter to complete the preparation.

[0048] The power of the microwave in step (2) is 400 W.

[0049] Example 2

[0050] A waterproof and corrosion-resistant one-component waterborne paint, the one-component waterborne paint is prepared from 100 parts by weight of an aqueous hydroxy acrylic emulsion, 20 parts by weight of an aqueous color paste, 20 parts by weight of deionized water, 2 parts by weight of an aqueous wetting agent, 5 parts by weight of a film-forming aid, 3 parts by weight of an aqueous corrosion inhibitor, 5 parts by weight of an adhesion promoter, 2 parts by weight of polyethylene glycol and 2 parts by weight of an aqueous polyurethane thickener.

[0051] The aqueous color paste is composed of a mixture of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of a rust-inhibitive pigment and 2 parts by weight of an aqueous dispersant. Among them, the rust-inhibitive pigment consists of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the aqueous dispersant is preferably sodium polyacrylate.

[0052] The aqueous wetting agent is a polyether-modified silicone.

[0053] The film-forming aid is dodecyl alcohol ester.

[0054] The aqueous corrosion inhibitor is triethanolamine oleate.

[0055] The adhesion promoter is prepared by the following steps:

[0056] Step a: Mix 10 parts by weight of tannic acid and 7 parts by weight of aqueous hydroxy acrylic emulsion, and stir at room temperature for 10 min to obtain solution a;

[0057] Step b: Add 1 part by weight of pyridine and 20 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 300 W for 15 min to obtain solution b;

[0058] Step c: React solution b by stirring at a temperature of 90 °C for 8 h to obtain solution c;

[0059] Step d: Add 1 part by weight of massive platinum metal to solution c, and then dropwise add 7 parts by weight of silane coupling agent while stirring at 45 °C. After the dropping is completed, continue to stir and react for 2 h, and then filter to obtain solution d;

[0060] Step e: Distill solution d under reduced pressure at 130 °C for 45 min to remove volatiles, and thus the preparation is completed.

[0061] The dropping speed in step d is controlled at 3 drops / s.

[0062] The silane coupling agent in step d is silane coupling agent A-171.

[0063] A preparation method of a waterproof and corrosion-resistant one-component aqueous paint, the preparation method comprising the following steps:

[0064] (1) Mix aqueous hydroxy acrylic emulsion, aqueous color paste, deionized water, film-forming aid, aqueous corrosion inhibitor and adhesion promoter, and stir at room temperature for 10 min to obtain solution A;

[0065] (2) Mix aqueous wetting agent and polyethylene glycol under the action of microwave for 10 min to obtain solution B;

[0066] (3) Mix solution A and solution B, stir at room temperature for 10 min, then add aqueous polyurethane thickener, continue to stir for 30 min, and filter to complete the preparation.

[0067] The power of the microwave in step (2) is 500 W.

[0068] Example 3

[0069] A waterproof and corrosion-resistant one-component waterborne paint, which is prepared from 60 parts by weight of a waterborne hydroxyl acrylic emulsion, 15 parts by weight of a waterborne color paste, 15 parts by weight of deionized water, 1.5 parts by weight of a waterborne wetting agent, 4 parts by weight of a film-forming aid, 2.5 parts by weight of a waterborne corrosion inhibitor, 4 parts by weight of an adhesion promoter, 1.5 parts by weight of polyethylene glycol and 1.5 parts by weight of a waterborne polyurethane thickener.

[0070] The waterborne color paste is composed of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of a rust-inhibitive pigment and 2 parts by weight of a waterborne dispersant. Among them, the rust-inhibitive pigment is composed of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the waterborne dispersant is preferably sodium polyacrylate.

[0071] The waterborne wetting agent is a polyether-modified silicone.

[0072] The film-forming aid is dodecyl alcohol ester.

[0073] The waterborne corrosion inhibitor is triethanolamine oleate.

[0074] The adhesion promoter is prepared by the following steps:

[0075] Step a: Mix 9 parts by weight of tannic acid and 6 parts by weight of the waterborne hydroxyl acrylic emulsion, and stir at room temperature for 8 min to obtain solution a;

[0076] Step b: Add 0.8 parts by weight of pyridine and 15 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 250 W for 13 min to obtain solution b;

[0077] Step c: React solution b at a temperature of 80 °C with stirring for 7 h to obtain solution c;

[0078] Step d: Add 0.8 parts by weight of massive platinum metal to solution c, and then dropwise add 6 parts by weight of a silane coupling agent while stirring at 43 °C. After the dropping is completed, continue to stir and react for 1.5 h, and then filter to obtain solution d;

[0079] Step e: Distill solution d under reduced pressure at 125 °C for 40 min to remove volatiles, and thus the preparation is completed.

[0080] The dropping speed in step d is controlled at 2 drops / s.

[0081] The silane coupling agent in step d is silane coupling agent A-171.

[0082] A preparation method of a waterproof and corrosion-resistant one-component waterborne paint, the preparation method comprising the following steps:

[0083] (1) Mix the aqueous hydroxy acrylic emulsion, aqueous color paste, deionized water, film-forming aid, aqueous corrosion inhibitor and adhesion promoter, and stir at room temperature for 8 min to obtain Solution A;

[0084] (2) Under the action of microwave, stir and mix the aqueous wetting agent and polyethylene glycol for 8 min to obtain Solution B;

[0085] (3) Mix Solution A and Solution B, stir at room temperature for 8 min, then add the aqueous polyurethane thickener and continue to stir for 25 min, and filter to complete the preparation.

[0086] The power of the microwave described in step (2) is 450 W.

[0087] Example 4

[0088] On the basis of Example 1, change the silane coupling agent described in step d from silane coupling agent A-171 to silane coupling agent KH-570.

[0089] The rest remain unchanged.

[0090] Example 5

[0091] On the basis of Example 1, change the film-forming aid from dodecyl alcohol ester to dodecyl alcohol ester, dipropylene glycol butyl ether, dipropylene glycol methyl ether and diethylene glycol butyl ether, and the mass ratio is 1:1:1:1.

[0092] Change the aqueous corrosion inhibitor from triethanolamine oleate to triethanolamine oleate, diethanolamine and benzotriazole, and the mass ratio is 1:1:1.

[0093] Change the silane coupling agent described in step d from silane coupling agent A-171 to silane coupling agent A-171 and silane coupling agent KH-570, and the mass ratio is 1:1.

[0094] The rest remain unchanged.

[0095] Comparative Example 1

[0096] A single-component waterborne paint with waterproof and corrosion-resistant properties. The single-component waterborne paint is prepared from 40 parts by weight of aqueous hydroxy acrylic emulsion, 10 parts by weight of aqueous color paste, 10 parts by weight of deionized water, 1 part by weight of aqueous wetting agent, 3 parts by weight of film-forming aid, 2 parts by weight of aqueous corrosion inhibitor, 3 parts by weight of adhesion promoter, 1 part by weight of polyethylene glycol and 0.5 part by weight of aqueous polyurethane thickener.

[0097] The water-based color paste is composed of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of rust-inhibitive pigment and 2 parts by weight of water-based dispersant. Among them, the rust-inhibitive pigment is composed of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the water-based dispersant is preferably sodium polyacrylate.

[0098] The water-based wetting agent is polyether-modified silicone.

[0099] The film-forming auxiliary agent is lauryl alcohol ester.

[0100] The water-based corrosion inhibitor is triethanolamine oleate.

[0101] The adhesion promoter is silane coupling agent A-171.

[0102] A preparation method of a water-proof and corrosion-resistant one-component water-based paint, the preparation method comprising the following steps:

[0103] (1) Mix the water-based hydroxyl acrylic emulsion, water-based color paste, deionized water, film-forming auxiliary agent, water-based corrosion inhibitor and adhesion promoter, and stir at room temperature for 5 min to obtain solution A;

[0104] (2) Under the action of microwave, stir and mix the water-based wetting agent and polyethylene glycol for 5 min to obtain solution B;

[0105] (3) Mix solution A and solution B, stir at room temperature for 5 min, then add the water-based polyurethane thickener, continue to stir for 20 min, and filter to complete the preparation.

[0106] The power of the microwave in step (2) is 400 W.

[0107] Comparative Example 2

[0108] A water-proof and corrosion-resistant one-component water-based paint, the one-component water-based paint is prepared from 40 parts by weight of water-based hydroxyl acrylic emulsion, 10 parts by weight of water-based color paste, 10 parts by weight of deionized water, 1 part by weight of water-based wetting agent, 3 parts by weight of film-forming auxiliary agent, 2 parts by weight of water-based corrosion inhibitor, 3 parts by weight of adhesion promoter, 1 part by weight of polyethylene glycol and 0.5 part by weight of water-based polyurethane thickener.

[0109] The water-based color paste is composed of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of rust-inhibitive pigment and 2 parts by weight of water-based dispersant. Among them, the rust-inhibitive pigment is composed of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the water-based dispersant is preferably sodium polyacrylate.

[0110] The aqueous wetting agent is a polyether-modified siloxane.

[0111] The film-forming auxiliary agent is dodecyl alcohol ester.

[0112] The aqueous anti-corrosion agent is triethanolamine oleate.

[0113] The adhesion promoter is silane coupling agent KH-570.

[0114] A preparation method of a waterproof and corrosion-resistant one-component aqueous paint, the preparation method comprising the following steps:

[0115] (1) Mix the aqueous hydroxyl acrylic emulsion, aqueous color paste, deionized water, film-forming auxiliary agent, aqueous anti-corrosion agent and adhesion promoter, and stir at room temperature for 5 min to obtain solution A;

[0116] (2) Under the action of microwave, stir and mix the aqueous wetting agent and polyethylene glycol for 5 min to obtain solution B;

[0117] (3) Mix solution A and solution B, stir at room temperature for 5 min, then add the aqueous polyurethane thickener, continue to stir for 20 min, and filter to complete the preparation.

[0118] The power of the microwave in step (2) is 400 W.

[0119] Comparative Example 3

[0120] A waterproof and corrosion-resistant one-component aqueous paint, the one-component aqueous paint is prepared from 40 parts by weight of aqueous hydroxyl acrylic emulsion, 10 parts by weight of aqueous color paste, 10 parts by weight of deionized water, 1 part by weight of aqueous wetting agent, 3 parts by weight of film-forming auxiliary agent, 2 parts by weight of aqueous anti-corrosion agent, 3 parts by weight of adhesion promoter, 1 part by weight of polyethylene glycol and 0.5 part by weight of aqueous polyurethane thickener.

[0121] The aqueous color paste is composed of a mixture of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of anti-rust pigment and 2 parts by weight of aqueous dispersant. Among them, the anti-rust pigment consists of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the aqueous dispersant is preferably sodium polyacrylate.

[0122] The aqueous wetting agent is a polyether-modified siloxane.

[0123] The film-forming auxiliary agent is dodecyl alcohol ester.

[0124] The aqueous anti-corrosion agent is triethanolamine oleate.

[0125] The adhesion promoter is prepared by the following steps:

[0126] Step a: Mix 8 parts by weight of tannic acid and 5 parts by weight of aqueous hydroxyl acrylic emulsion, and stir for 5 min at room temperature to obtain solution a;

[0127] Step b: Add 0.5 part by weight of pyridine and 10 parts by weight of deionized water to solution a, and then stir and mix in ultrasonic with a power of 200 W for 10 min to obtain solution b;

[0128] Step c: React solution b by stirring at 70 °C for 6 h to obtain solution c;

[0129] Step d: Add 40 parts by weight of ethyl acetate to solution c for extraction, let it stand for 5 min to separate layers, and take the lower layer, then the preparation is completed.

[0130] A preparation method of a waterproof and corrosion-resistant one-component waterborne paint, the preparation method comprising the following steps:

[0131] (1) Mix aqueous hydroxyl acrylic emulsion, aqueous color paste, deionized water, film-forming aid, aqueous corrosion inhibitor and adhesion promoter, and stir at room temperature for 5 min to obtain solution A;

[0132] (2) Mix aqueous wetting agent and polyethylene glycol under the action of microwave for 5 min to obtain solution B;

[0133] (3) Mix solution A and solution B, stir at room temperature for 5 min, then add aqueous polyurethane thickener, continue to stir for 20 min, and filter, then the preparation is completed.

[0134] The power of the microwave in step (2) is 400 W.

[0135] Comparative Example 4

[0136] A waterproof and corrosion-resistant one-component waterborne paint, the one-component waterborne paint is prepared from 40 parts by weight of aqueous hydroxyl acrylic emulsion, 10 parts by weight of aqueous color paste, 10 parts by weight of deionized water, 1 part by weight of aqueous wetting agent, 3 parts by weight of film-forming aid, 2 parts by weight of aqueous corrosion inhibitor, 3 parts by weight of adhesion promoter, 1 part by weight of polyethylene glycol and 0.5 part by weight of aqueous polyurethane thickener.

[0137] The aqueous color paste is composed of a mixture of 50 parts by weight of deionized water, 6 parts by weight of titanium dioxide, 4 parts by weight of talc powder, 3 parts by weight of mica powder, 2 parts by weight of barium sulfate, 15 parts by weight of rust-inhibitive pigment and 2 parts by weight of aqueous dispersant. Among them, the rust-inhibitive pigment is composed of 25% zinc phosphate and 75% aluminum tripolyphosphate, and the aqueous dispersant is preferably sodium polyacrylate.

[0138] The aqueous wetting agent is polyether-modified silicone.

[0139] The film-forming auxiliary is dodecyl alcohol ester.

[0140] The water-based corrosion inhibitor is triethanolamine oleate.

[0141] The adhesion promoter is prepared by the following steps:

[0142] Step a: Mix 8 parts by weight of tannic acid and 5 parts by weight of water-based hydroxyl acrylic emulsion, and stir at room temperature for 5 min to obtain solution a;

[0143] Step b: Add 0.5 part by weight of pyridine and 10 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 200 W for 10 min to obtain solution b;

[0144] Step c: React solution b by stirring at a temperature of 70 °C for 6 h to obtain solution c;

[0145] Step d: Add 0.5 part by weight of massive platinum metal to solution c, and then dropwise add 5 parts by weight of silane coupling agent while stirring at 40 °C. After the dropping is completed, continue to stir and react for 1 h, and then filter to obtain solution d;

[0146] Step e: Distill solution d under reduced pressure at 120 °C for 30 min to remove volatiles, and thus the preparation is completed.

[0147] The dropping speed in step d is controlled at 1 drop / s.

[0148] The silane coupling agent in step d is silane coupling agent A-171.

[0149] A preparation method of a waterproof and corrosion-resistant one-component water-based paint, the preparation method comprising the following steps:

[0150] (1) Mix water-based hydroxyl acrylic emulsion, water-based color paste, deionized water, film-forming auxiliary, water-based corrosion inhibitor and adhesion promoter, and stir at room temperature for 5 min to obtain solution A;

[0151] (2) Mix water-based wetting agent and polyethylene glycol by stirring for 5 min to obtain solution B;

[0152] (3) Mix solution A and solution B, stir at room temperature for 5 min, then add water-based polyurethane thickener, continue to stir for 20 min, and filter to complete the preparation.

[0153] Test Example 1

[0154] Performance test:

[0155] The one-component waterborne paints prepared in Example 1, Example 4 and Comparative Examples 1-4 were used immediately after preparation, applied on a glass mold coated with a release agent, and after drying to form a film, the thickness was measured to be (1 ± 0.1) mm. After peeling off after 24 h and leaving it for 3 days, the appearance was observed for pinholes and pits, and after stretching 100% to both sides, cracks and air holes were checked for appearance.

[0156] The one-component waterborne paints prepared in Example 1, Example 4 and Comparative Examples 1-4 were used immediately after preparation, applied on a smooth surface (aluminum material), and then brush marks were made in the middle of the coating film with a brush respectively, and the disappearance speed of the brush marks was observed.

[0157] Table 1. Performance test results

[0158]

[0159] Test Example 2

[0160] Adhesion test:

[0161] The one-component waterborne paints prepared in Example 1, Example 4 and Comparative Examples 1-4 were used immediately after preparation, and the cross-cut adhesion test was carried out according to GB / T 9286-1998. The substrates were: electrophoretic paint, cast aluminum, cast iron, tinplate and ABS plastic, and the adhesion of the coating film decreased in turn from grade 0 to grade 5.

[0162] Table 2. Adhesion test results

[0163]

[0164]

[0165] Test Example 3

[0166] Boiling water test:

[0167] The one-component waterborne paints prepared in Example 1, Example 4 and Comparative Examples 1-4 were used immediately after preparation, applied on the surface with cast iron as the substrate, and after drying to form a film, the thickness was measured to be (1 ± 0.1) mm, and then placed in boiling water at 100 °C for 2 h. After boiling, the film surface was observed for blistering, peeling, stickiness, cracking and other conditions.

[0168] Table 3. Boiling water test results

[0169] Surface condition Example 1 No blistering, peeling, stickiness, or cracking Example 4 No blistering, peeling, stickiness, or cracking Comparative Example 1 Partial blistering and stickiness, no peeling or cracking Comparative Example 2 Substantial blistering, stickiness, peeling, and cracking Comparative Example 3 Very few blisters and peeling, no stickiness or cracking Comparative Example 4 Very few blisters, peeling, and cracking, no stickiness

[0170] From the comparison of the above Example 1, Example 4, Comparative Examples 1-4 and Test Examples 1-3, it can be seen that:

[0171] The difference between Comparative Example 1 and Example 1 is that the adhesion promoter is silane coupling agent A-171.

[0172] The difference between Comparative Example 2 and Example 1 is that the adhesion promoter is silane coupling agent KH-570.

[0173] The difference between Comparative Example 3 and Example 1 is that tannic acid was not further modified with silane coupling agent.

[0174] The difference between Comparative Example 4 and Example 1 is that the aqueous wetting agent and polyethylene glycol were not compounded under the action of microwave.

[0175] Comparing Example 1, Example 4, Comparative Examples 1-4 and Test Example 1, it can be seen that the single-component waterborne paint prepared by the present invention has excellent performance. Whether in the natural state or under tension, there are no phenomena such as pores, pinholes, cracking, etc., and it has good leveling property, which promotes the waterproof and corrosion-resistant performance.

[0176] Comparing Example 1, Example 4, Comparative Examples 1-4 and Test Example 2, it can be seen that the single-component waterborne paint prepared by the present invention can greatly improve the adhesion between each substrate (electrophoretic paint, cast aluminum, cast iron, tinplate and ABS plastic), promote adhesion, and ensure the waterproof and corrosion-resistant performance.

[0177] Comparing Example 1, Example 4, Comparative Examples 1-4 and Test Example 3, it can be seen that the single-component waterborne paint prepared by the present invention does not show blistering, peeling, stickiness, cracking even after being boiled in water, and can well meet the market demand.

[0178] The above is only the preferred embodiment of the present invention, and it is not intended to limit the present invention in any form. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content without departing from the technical solution of the present invention. However, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A one-component waterborne paint with waterproof and corrosion-resistant properties, characterized in that: The one-component waterborne paint is prepared from 40 - 100 parts by weight of waterborne hydroxyl acrylic emulsion, 10 - 20 parts by weight of waterborne color paste, 10 - 20 parts by weight of deionized water, 1 - 2 parts by weight of waterborne wetting agent, 3 - 5 parts by weight of film-forming aid, 2 - 3 parts by weight of waterborne corrosion inhibitor, 3 - 5 parts by weight of adhesion promoter, 1 - 2 parts by weight of polyethylene glycol, and 0.5 - 2 parts by weight of waterborne polyurethane thickener; The adhesion promoter is prepared by the following steps: Step a: Mix 8 - 10 parts by weight of tannic acid and 5 - 7 parts by weight of waterborne hydroxyl acrylic emulsion, and stir at room temperature for 5 - 10 min to obtain solution a; Step b: Add 0.5 - 1 part by weight of pyridine and 10 - 20 parts by weight of deionized water to solution a, and then stir and mix in an ultrasonic wave with a power of 200 - 300 W for 10 - 15 min to obtain solution b; Step c: React solution b at a temperature of 70 - 90 °C with stirring for 6 - 8 h to obtain solution c; Step d: Add 0.5 - 1 part by weight of massive metallic platinum to solution c, and then dropwise add 5 - 7 parts by weight of silane coupling agent while stirring at 40 - 45 °C. After the dropping is completed, continue to stir and react for 1 - 2 h, and filter to obtain solution d; Step e: Distill solution d under reduced pressure at 120 - 130 °C for 30 - 45 min to remove volatiles, and thus the preparation is completed.

2. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The waterborne color paste is composed of a mixture of deionized water, titanium dioxide, talc powder, mica powder, barium sulfate, rust-inhibiting pigment, and waterborne dispersant.

3. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The waterborne wetting agent is polyether-modified silicone.

4. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The film-forming aid is at least one of lauryl alcohol ester, dipropylene glycol butyl ether, dipropylene glycol methyl ether, and diethylene glycol butyl ether.

5. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The waterborne corrosion inhibitor is at least one of triethanolamine oleate, diethanolamine, and benzotriazole.

6. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The dropping speed in step d is controlled at 1 - 3 drops / s.

7. A one-component waterborne paint with waterproof and corrosion-resistant properties according to claim 1, characterized in that: The silane coupling agent in step d is at least one of silane coupling agent A-171 and silane coupling agent KH-570.

8. A preparation method of a one-component waterborne paint with waterproof and corrosion-resistant properties according to any one of claims 1 - 7, characterized in that: The preparation method includes the following steps: (1) Mix the waterborne hydroxyl acrylic emulsion, waterborne color paste, deionized water, film-forming aid, waterborne corrosion inhibitor, and adhesion promoter, and stir at room temperature for 5 - 10 min to obtain solution A; (2) Under the action of microwave, stir and mix the aqueous wetting agent and polyethylene glycol for 5 - 10 min to obtain Solution B; (3) Mix Solution A and Solution B, stir at room temperature for 5 - 10 min, then add the aqueous polyurethane thickener, continue to stir for 20 - 30 min, and filter to complete the preparation.

9. The preparation method of a single-component waterborne paint with waterproof and corrosion-resistant properties according to Claim 8, characterized in that: the power of the microwave in step (2) is 400 - 500 W.

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