阅读说明：本技术 耐高温、耐老化型低voc聚氨酯防腐涂料及其制备方法 (High-temperature-resistant aging-resistant low-VOC (volatile organic compound) polyurethane anticorrosive paint and preparation method thereof ) 是由 周学军 于 2021-09-29 设计创作，主要内容包括：本发明属于涂料技术领域。一种耐高温、耐老化型低VOC聚氨酯防腐涂料,包括质量比为为10-15:1的甲组分和乙组分；甲组分包括以下按质量份数计算的组分：高氯化聚乙烯树脂15-30份、含氟丙烯酸酯改性聚氨酯树脂15-20份、聚酯多元醇1-5份、填料1-20份、分散剂0.1-3份、有机溶剂20-30份、助剂0.1-3份；乙组分为固化剂。本发明涂料VOC含量低,成膜性能好,漆膜具有良好的韧性、基材附着力、机械性能、耐化学品性能和耐高温性能,高温条件下漆膜不易开裂起泡,拉伸强度高,抗冲击性能好。(The invention belongs to the technical field of coatings. A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10-15: 1; the component A comprises the following components in parts by mass: 15-30 parts of high chlorinated polyethylene resin, 15-20 parts of fluorine-containing acrylate modified polyurethane resin, 1-5 parts of polyester polyol, 1-20 parts of filler, 0.1-3 parts of dispersant, 20-30 parts of organic solvent and 0.1-3 parts of auxiliary agent; the component B is a curing agent. The paint disclosed by the invention is low in VOC content and good in film forming performance, a paint film has good toughness, substrate adhesion, mechanical performance, chemical resistance and high temperature resistance, the paint film is not easy to crack and bubble under a high-temperature condition, the tensile strength is high, and the impact resistance is good.)

1. The high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint is characterized by comprising a component A and a component B in a mass ratio of 10-15: 1; the component A comprises the following components in parts by mass: 15-30 parts of high chlorinated polyethylene resin, 15-20 parts of fluorine-containing acrylate modified polyurethane resin, 1-5 parts of polyester polyol, 1-20 parts of filler, 0.1-3 parts of dispersant, 20-30 parts of organic solvent and 0.1-3 parts of auxiliary agent; the component B is a curing agent.

2. The high temperature and aging resistant low VOC polyurethane anticorrosive coating of claim 1, characterized in that the polyester polyol is formed by condensation of hexahydrophthalic anhydride and neopentyl glycol hydroxypivalate monoester.

3. The high temperature resistant, aging resistant, low VOC polyurethane anti-corrosive coating according to claim 1, wherein the filler is boron nitride, aluminum chromium phosphate and zirconium oxide.

4. The high temperature resistant, aging resistant, low VOC polyurethane anti-corrosive coating of claim 1, wherein said dispersant is maleic anhydride-vinyl acetate copolymer.

5. The high temperature resistant, aging resistant, low VOC polyurethane anti-corrosive coating according to claim 1, wherein said solvent is at least one of butyl acetate, ethyl acetate, and dimethyl carbonate.

6. The high temperature resistant, aging resistant, low VOC polyurethane anticorrosive coating according to claim 1, characterized in that the curing agent is a solvent-free isocyanate.

7. The high temperature resistant, aging resistant, low VOC polyurethane anti-corrosive coating according to claim 1, wherein said additives comprise at least one of the following components: defoaming agent, preservative, film forming assistant and leveling agent.

8. The high temperature resistant, aging resistant, low VOC polyurethane anticorrosive coating according to claim 7, characterized in that the defoamer is polyether modified polysiloxane; the film-forming additive is alcohol ester twelve; the leveling agent is organic silicon modified polysiloxane.

9. The preparation method of the high-temperature-resistant aging-resistant low-VOC polyurethane anticorrosive paint disclosed by any one of claims 1 to 8 is characterized by comprising the following steps of: mixing the auxiliary agent, the dispersing agent, the polyester polyol and the organic solvent, and stirring for 15-30min at the speed of 500 r/min; adding a filler, and uniformly stirring at 1500-3000 r/min; adding high chlorinated polyethylene resin and fluorine-containing acrylate modified polyurethane resin, stirring for 15-30min at 500r/min with 300-.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a high-temperature-resistant aging-resistant low-VOC (volatile organic compound) polyurethane anticorrosive coating and a preparation method thereof.

Background

The metal structure is exposed to the environment and is affected by various corrosion factors, and the corrosion of the metal structure can cause huge economic loss. Among the existing anticorrosive coatings, the polyurethane anticorrosive coating is most widely applied, has good adhesion, hydrophobicity, high glossiness, good mechanical property and proper biocompatibility, but has the defects of poor thermal stability, poor water resistance and the like, and is easily influenced by heat, light, air and water in the storage and transportation processes, so that the polymer is degraded, the color of a coating film is changed, the coating film is crisp, and the mechanical property is reduced. Therefore, a polyurethane anticorrosive coating which can resist high temperature and aging, has low VOC content and meets the requirement of environmental protection is needed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive coating which is low in VOC content and good in film forming performance, wherein a paint film has good toughness, base material adhesion, mechanical performance, chemical resistance and high-temperature resistance, the paint film is not easy to crack and bubble under a high-temperature condition, and is high in tensile strength and good in impact resistance.

The technical scheme of the invention is as follows:

a high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10-15: 1; the component A comprises the following components in parts by mass: 15-30 parts of high chlorinated polyethylene resin, 15-20 parts of fluorine-containing acrylate modified polyurethane resin, 1-5 parts of polyester polyol, 1-20 parts of filler, 0.1-3 parts of dispersant, 20-30 parts of organic solvent and 0.1-3 parts of auxiliary agent; the component B is a curing agent.

Further, the polyester polyol is formed by condensing hexahydrophthalic anhydride and neopentyl glycol hydroxypivalate monoester. The hydroxypivalyl hydroxypivalate has good thermal stability, hydrolysis resistance, oxidation resistance and molecular structure flexibility, and the polyester polyol at the supporting point has a good toughening effect on the coating, so that the flexibility, weather resistance, light-oxygen aging resistance, temperature change resistance and impact resistance of a paint film can be improved.

Further, the filler is boron nitride, aluminum chromium phosphate and zirconium oxide. Boron nitride can improve the thermal stability, water resistance and oxidation resistance of the paint film. The aluminum chromium phosphate can improve the compactness, the mechanical strength and the scratch and wear resistance of a paint film. The zirconium oxide can improve the crosslinking strength of a paint film, thereby improving the hardness and mechanical properties of the paint film. The three materials have low expansion coefficients, can reduce the volume shrinkage of the coating when the temperature changes, and improve the high temperature resistance and the ageing resistance of the paint film.

Further, the dispersing agent is maleic anhydride-vinyl acetate copolymer. The maleic anhydride-vinyl acetate copolymer can be adsorbed on the surface of the filler to form a film, so that the filler is prevented from agglomerating, the surface tension is reduced, and the dispersion performance of the filler is improved. Meanwhile, the viscosity of the coating can be reduced, the film-forming property of the coating can be improved, and the flexibility of a paint film and the adhesive force of a base material can be improved.

Further, the solvent is at least one of butyl acetate, ethyl acetate and dimethyl carbonate. The solvent toxicity is low, and the VOC content is low.

Furthermore, the curing agent is solvent-free isocyanate, and the VOC content is low. The isocyanate and the polyester polyol are crosslinked and cured to toughen the paint film, so that the adhesive force, elasticity and compactness of the base material of the paint film are improved, and the high-temperature resistance of the paint film is improved.

Further, the auxiliary agent comprises at least one of the following components: defoaming agent, preservative, film forming assistant and leveling agent.

Further, the defoaming agent is polyether modified polysiloxane; the film-forming additive is alcohol ester twelve; the leveling agent is organic silicon modified polysiloxane.

The preparation method of the high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises the following steps: mixing the auxiliary agent, the dispersing agent, the polyester polyol and the organic solvent, and stirring for 15-30min at the speed of 500 r/min; adding a filler, and uniformly stirring at 1500-3000 r/min; adding high chlorinated polyethylene resin and fluorine-containing acrylate modified polyurethane resin, stirring for 15-30min at 500r/min with 300-.

The invention has the following beneficial effects:

the fluorine-containing acrylate modified polyurethane resin has good base material adhesion, weather resistance, chemical resistance and wear resistance. The high chlorinated polyethylene resin has good film forming property and high curing speed, and a paint film has good corrosion resistance, water resistance, oil resistance, weather resistance and temperature change resistance. The two are used as film forming substances of the paint, and the mechanical property, chemical resistance, high temperature resistance and aging resistance of a paint film can be improved. The addition of the polyester polyol improves the film forming performance of the coating, improves the base material adhesive force, flexibility and compactness of a paint film, and further improves the high temperature resistance and aging resistance of the paint film.

Detailed Description

The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.

Example 1

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 15 parts of high chlorinated polyethylene resin, 20 parts of fluorine-containing acrylate modified polyurethane resin, 5 parts of polyester polyol, 5 parts of boron nitride, 8 parts of aluminum chromium phosphate, 3 parts of zirconium oxide, 3 parts of maleic anhydride-vinyl acetate copolymer, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate;

wherein the polyester polyol is prepared by condensing hexahydrophthalic anhydride and hydroxypivalic acid neopentyl glycol monoester.

Example 2

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 15 parts of high chlorinated polyethylene resin, 20 parts of fluorine-containing acrylate modified polyurethane resin, 5 parts of polyester polyol, 8 parts of zirconium oxide, 8 parts of aluminum chromium phosphate, 3 parts of maleic anhydride-vinyl acetate copolymer, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate;

wherein the polyester polyol is prepared by condensing hexahydrophthalic anhydride and hydroxypivalic acid neopentyl glycol monoester.

Example 3

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 15 parts of high chlorinated polyethylene resin, 20 parts of fluorine-containing acrylate modified polyurethane resin, 5 parts of polyester polyol, 5 parts of boron nitride, 8 parts of aluminum chromium phosphate, 3 parts of zirconium oxide, 3 parts of polyvinylpyrrolidone, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate;

wherein the polyester polyol is prepared by condensing hexahydrophthalic anhydride and butanediol.

Comparative example 1

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 35 parts of fluorine-containing acrylate modified polyurethane resin, 5 parts of polyester polyol, 5 parts of boron nitride, 8 parts of aluminum chromium phosphate, 3 parts of zirconium oxide, 3 parts of maleic anhydride-vinyl acetate copolymer, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate;

wherein the polyester polyol is prepared by condensing hexahydrophthalic anhydride and hydroxypivalic acid neopentyl glycol monoester.

Comparative example 2

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 35 parts of high chlorinated polyethylene resin, 5 parts of polyester polyol, 5 parts of boron nitride, 8 parts of aluminum chromium phosphate, 3 parts of zirconium oxide, 3 parts of maleic anhydride-vinyl acetate copolymer, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate;

wherein the polyester polyol is prepared by condensing hexahydrophthalic anhydride and hydroxypivalic acid neopentyl glycol monoester.

Comparative example 3

A high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10: 1; the component A comprises the following components in parts by mass: 20 parts of high chlorinated polyethylene resin, 20 parts of fluorine-containing acrylate modified polyurethane resin, 5 parts of boron nitride, 8 parts of aluminum chromium phosphate, 3 parts of zirconium oxide, 3 parts of maleic anhydride-vinyl acetate copolymer, 20 parts of dimethyl carbonate and 0.1 part of polyether modified polysiloxane; the component B is solvent-free isocyanate.

The preparation method of the high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint comprises the following steps: mixing the auxiliary agent, the dispersing agent, the polyester polyol and the organic solvent, and stirring for 30min at the speed of 300 r/min; adding a filler, and uniformly stirring at 1500 r/min; adding high chlorinated polyethylene resin and fluorine-containing acrylate modified polyurethane resin, and stirring at 300r/min for 30min to obtain component A.

The performances of the high-temperature-resistant and aging-resistant low-VOC polyurethane anticorrosive paint in examples 1-3 and comparative examples 1-3 are tested, the components A and B are mixed and applied, an equal amount of sample is coated on a low-carbon steel plate with the surface being subjected to oil removal and polishing treatment, and the performances are tested after the low-carbon steel plate is placed at room temperature for 7 days, and the test results are shown in the following table:

test items	Test standard	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2	Comparative example 3
								Adhesion/grade	GB/T 5210-2006	0	0	0	1	1	1
Flexibility/mm	GB/T 1731-1993	1	1	1	2	1	2
								Heat resistance/h (220 ℃ C.)	/	6000	5500	5800	5000	5000	5500
Hardness of pencil	GB/T 6739-2006	5H	6H	6H	6H	2H	4H
								Aging resistance (3000h)	State of paint film	Normal paint film	Normal paint film	Normal paint film	Slight cracking	Cracking and blistering	Normal paint film
Acid-resistant salt mist/h	GB/T T1771-91	4500	4300	4200	3000	2500	3500
								Adhesion/grade after salt spray test	GB/T 5210-2006	0	0	1	2	3	2

Therefore, the coating disclosed by the invention has good base material adhesion, flexibility, heat resistance, aging resistance and acid salt fog resistance.

The paint disclosed by the invention is low in VOC content and good in film forming performance, a paint film has good toughness, substrate adhesion, mechanical performance, chemical resistance and high temperature resistance, the paint film is not easy to crack and bubble under a high-temperature condition, the tensile strength is high, and the impact resistance is good.