阅读说明：本技术 一种基于石墨烯改性的钢材用功能重防腐水性涂料及其制备方法和使用方法 (Graphene-modified functional heavy-duty water-based paint for steel, and preparation method and application method thereof ) 是由 王俊中 王聪伟 巩向杰 于 2020-04-10 设计创作，主要内容包括：本发明公开了一种基于石墨烯改性的钢材用功能重防腐水性涂料及其制备方法,所述功能防腐涂料由环氧树脂复合底漆、氟碳复合面漆及氟碳金属清漆组成。所述环氧树脂复合底漆是由水性环氧树脂、石墨烯、分散剂、稀释剂、环氧固化剂等组成,所述氟碳复合面漆由氟碳面漆、石墨烯、分散剂、稀释剂、抗菌剂、氟碳固化剂等组成,所述氟碳金属清漆由氟碳漆、金属粉末、稀释剂、氟碳固化剂等组成,环氧树脂复合底漆与氟碳复合面漆、氟碳金属清漆各部分性能互相补充并彼此关联,所形成的重防腐涂料提高了基材的耐腐蚀性能。本发明所公开的石墨烯功能涂层具有防腐、导热、抑菌、阻燃、憎油憎水等多种功能,应用领域广泛,制备方法简单,极易规模化生产、实施。(The invention discloses graphene-modified functional heavy-duty anticorrosive water-based paint for steel and a preparation method thereof. The epoxy resin composite primer is composed of water-based epoxy resin, graphene, a dispersing agent, a diluent, an epoxy curing agent and the like, the fluorocarbon composite finish paint is composed of fluorocarbon finish paint, graphene, a dispersing agent, a diluent, an antibacterial agent, a fluorocarbon curing agent and the like, the fluorocarbon metal varnish is composed of fluorocarbon paint, metal powder, a diluent, a fluorocarbon curing agent and the like, the performances of the epoxy resin composite primer, the fluorocarbon composite finish paint and the fluorocarbon metal varnish are mutually supplemented and associated, and the formed heavy anti-corrosion coating improves the corrosion resistance of the base material. The graphene functional coating disclosed by the invention has multiple functions of corrosion resistance, heat conduction, bacteriostasis, flame retardance, oil repellency, hydrophobicity and the like, is wide in application field, simple in preparation method and easy for large-scale production and implementation.)

1. The functional heavy-duty anticorrosive water-based paint based on graphene modification for steel is characterized by comprising the following components in parts by weight: the heavy-duty anticorrosive water-based paint consists of an epoxy resin composite primer, a fluorocarbon composite finish and a fluorocarbon metal varnish;

the epoxy resin composite primer is composed of water-based epoxy resin, graphene, a dispersing agent, a diluent and an epoxy curing agent, and the prepared water-based epoxy resin has excellent corrosion resistance and heat conductivity;

the fluorocarbon composite finish paint consists of fluorocarbon finish paint, graphene, a dispersing agent, a diluent, an antibacterial agent and a fluorocarbon curing agent, and the prepared fluorocarbon composite finish paint has the performances of corrosion prevention and bacteriostasis;

the fluorocarbon metal varnish consists of fluorocarbon paint, metal powder, diluent and fluorocarbon curing agent, and the prepared fluorocarbon composite varnish has the performances of corrosion resistance, flame retardance, oil repellency and hydrophobicity.

2. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the epoxy resin composite primer coating comprises the following components in parts by weight: 100 parts of water-based epoxy resin, 0.3-1 part of graphene, 0.1-0.2 part of dispersant, 1-10 parts of diluent and 30 parts of epoxy curing agent.

3. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 2, wherein: the graphene is graphene oxide, and the mass ratio of the graphene to the water-based epoxy resin is 3-10: 1000;

the dispersing agent is polyvinyl alcohol, and the molecular weight of the dispersing agent is 16000-200000;

the diluent is water;

the epoxy curing agent is an amine curing agent;

the amine curing agent comprises a polyamide curing agent.

4. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the fluorocarbon composite finish paint comprises the following components in parts by weight: 100 parts of fluorocarbon finish, 0.3-0.5 part of graphene, 0.06-0.1 part of dispersing agent, 80-100 parts of diluent, 3-5 parts of antibacterial agent and 20 parts of fluorocarbon curing agent.

5. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 4, wherein: the graphene is graphene oxide, the dispersing agent is polyvinyl alcohol, and the molecular weight of the dispersing agent is 16000-200000; the diluent is water; the antibacterial agent comprises nano titanium dioxide; the fluorocarbon curing agent is a water-based isocyanate curing agent.

6. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the fluorocarbon composite clear coating comprises the following components in percentage by weight: 100 parts of fluorocarbon varnish, 1-3 parts of metal powder, 30-60 parts of diluent and 20 parts of fluorocarbon curing agent.

7. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 6, wherein: the metal powder comprises one or a mixture of aluminum powder, magnesium hydroxide and aluminum hydroxide; the fluorocarbon curing agent is a water-based isocyanate curing agent.

8. The preparation method of the functional heavy-duty water-based paint for graphene-modified steel products, which is based on any one of claims 1 to 7, is characterized by comprising the following steps:

the preparation method of the epoxy resin composite primer coating comprises the following steps: mixing and stirring 3-10 parts of graphene slurry and 1-2 parts of polyvinyl alcohol solution for 24 hours to form a mixture; slowly dropping the mixture into 1000 parts of epoxy resin solution, and stirring for 24 hours to form a mixture; slowly dripping 300 parts of epoxy curing agent into the mixture, curing for 15 min to form the epoxy resin composite primer coating;

the preparation method of the fluorocarbon composite finish paint comprises the following steps: uniformly mixing the fluorocarbon finish paint and a diluent to form a fluorocarbon diluted mixture for later use; mixing and stirring 3-5 parts of graphene slurry and a polyvinyl alcohol solution for 24 hours to form a mixture; slowly dripping the mixture into 1000 parts of fluorocarbon diluted mixture, and stirring for 24 hours to form a mixture; then adding 30-50 parts of an antibacterial agent into the mixture and uniformly mixing; slowly dripping 200 parts of fluorocarbon curing agent into the mixture, curing for 15 min to form fluorocarbon composite finish paint;

the preparation method of the fluorocarbon metal varnish coating comprises the following steps: uniformly mixing 100 parts of fluorocarbon paint and 30-60 parts of diluent, and sieving with a 200-target cone sieve; mixing and stirring 1-3 parts of metal powder and fluorocarbon diluted paint for 24 hours to form a mixture; and slowly dripping 20 parts of fluorocarbon curing agent into the mixture, and curing for 15 min to form the fluorocarbon metal varnish coating.

9. The use method of the functional heavy-duty water-based paint for graphene-modified steel products, which is set forth in any one of claims 1 to 7, is characterized in that:

performing surface treatment on the anticorrosive base material, and removing rust and oil; then spraying the epoxy resin composite primer coating, wherein the thickness of the coating is 30-50 mu m, and drying at room temperature for 48 h; then spraying the fluorocarbon composite finish paint, wherein the thickness of the coating is 20-30 mu m, and drying for 48 h at room temperature; and finally, spraying the fluorocarbon varnish coating, wherein the thickness of the coating is 10-20 microns, and drying for 48 hours to obtain the functional heavy-duty anticorrosive water-based coating for the steel based on graphene modification.

Technical Field

The invention relates to a graphene-modified functional heavy-duty water-based paint for steel, a preparation method and a use method thereof, and belongs to the field of paints.

Background

The metal corrosion wastes resources and energy, and the economic loss caused by the metal corrosion in China is estimated to occupy about 4% of the total production value of China every year, so that the corrosion prevention problem is imminent. However, foreign enterprises account for over 60% of the market share of domestic anticorrosive coatings, and the development of domestic anticorrosive coating technology is to be improved. Especially in the field of heavy duty corrosion protection. The heavy-duty anticorrosive paint is suitable for chemical industry atmosphere and marine environment. However, most of the existing heavy-duty anticorrosive coatings have single functionality, and the chemical atmosphere and marine environment are changeable. Various problems such as bacteria and fire are easy to breed in the changeable environment. Therefore, to protect against various problems, different coatings need to be applied. The mixed use of these different coatings not only consumes manpower and material resources but also reduces the effect thereof, so that the equipment cannot be protected for a long time. In order to achieve comprehensive corrosion resistance of equipment, it is extremely necessary to develop a functional comprehensive heavy-duty composite coating.

Disclosure of Invention

The invention aims to provide a graphene-modified functional heavy-duty anticorrosive water-based paint for steel and a preparation method thereof.

The invention also aims to provide a using method of the functional heavy-duty anticorrosive paint consisting of the epoxy resin composite primer, the fluorocarbon composite finish paint and the fluorocarbon metal varnish.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:

the invention provides a graphene-modified functional heavy-duty water-based paint for steel, which consists of an epoxy resin composite primer, a fluorocarbon composite finish and a fluorocarbon metal varnish.

Furthermore, the epoxy resin composite primer is composed of water-based epoxy resin, graphene, a dispersing agent, a diluent, an epoxy curing agent and the like, and the prepared water-based epoxy resin has excellent corrosion resistance and heat conductivity.

Further, the epoxy resin composite primer coating comprises the following components in percentage by weight: 100 parts of epoxy resin, 0.3-1 part of graphene, 0.1-0.2 part of dispersant, 1-10 parts of diluent and 30 parts of epoxy curing agent.

Further, the epoxy resin is a water-based epoxy resin.

Further, the graphene is graphene oxide, and the mass ratio of the graphene to the epoxy resin is 3-10: 1000.

Furthermore, the dispersing agent is polyvinyl alcohol, and the molecular weight of the dispersing agent is 16000-200000. The polyvinyl alcohol and the graphene are functionally modified through pi-pi bonds, so that the formed modified graphene can keep high dispersibility and conductivity in a solvent.

Further, the diluent is water.

Further, the epoxy curing agent is an amine curing agent.

Further, the preparation method of the epoxy resin composite primer coating comprises the following steps: and mixing and stirring 3-10 parts of graphene slurry and a polyvinyl alcohol solution for 24 hours to form a mixture. The mixture was slowly dropped into 1000 parts of an epoxy resin solution, and after stirring for 24 hours, a mixture was formed. And slowly dripping 300 parts of epoxy curing agent into the mixture, and curing for 15 min to form the epoxy resin composite primer coating.

Furthermore, the fluorocarbon composite finish paint is composed of fluorocarbon finish paint, graphene, a dispersing agent, a diluent, an antibacterial agent, a fluorocarbon curing agent and the like, and the prepared fluorocarbon composite finish paint has the performances of corrosion prevention and bacteriostasis.

Further, the fluorocarbon composite finish paint comprises the following components in percentage by weight: 100 parts of fluorocarbon finish, 0.3-0.5 part of graphene, 0.06-0.1 part of dispersing agent, 80-100 parts of diluent, 3-5 parts of antibacterial agent and 20 parts of fluorocarbon curing agent.

Further, the antibacterial agent includes nano titanium dioxide.

Further, the preparation method of the fluorocarbon composite finish paint comprises the following steps: and uniformly mixing the fluorocarbon finish paint and the diluent to form a fluorocarbon diluted mixture for later use. And mixing and stirring 3-5 parts of graphene slurry and a polyvinyl alcohol solution for 24 hours to form a mixture. The mixture was slowly dropped into 1000 parts of the fluorocarbon diluted mixture, and after stirring for 24 hours, a mixture was formed. Then adding a certain amount of antibacterial agent into the mixture and uniformly mixing. And slowly dripping 200 parts of fluorocarbon curing agent into the mixture, and curing for 15 min to form the fluorocarbon composite finish paint.

Furthermore, the fluorocarbon metal varnish consists of fluorocarbon paint, metal powder, a diluent and a fluorocarbon curing agent, and the prepared fluorocarbon composite varnish has the performances of corrosion resistance, flame retardance, oil repellency and hydrophobicity.

Further, the fluorocarbon composite finish paint comprises the following components in percentage by weight: 100 parts of fluorocarbon varnish, 1-3 parts of metal powder, 30-60 parts of diluent and 20 parts of fluorocarbon curing agent.

Further, the metal powder includes two or a mixture of aluminum powder, magnesium hydroxide, and aluminum hydroxide.

Further, the preparation method of the fluorocarbon metal varnish coating comprises the following steps: and (3) uniformly mixing 100 parts of fluorocarbon paint and 30-60 parts of diluent, and sieving with a 200-target cone sieve. And mixing and stirring 1-3 parts of metal powder and fluorocarbon diluted paint for 24 hours to form a mixture. And slowly dripping 20 parts of fluorocarbon curing agent into the mixture, and curing for 15 min to form the fluorocarbon metal varnish coating.

Further, the use method of the functional heavy-duty water-based paint for the graphene-modified steel comprises the following steps: and (4) carrying out surface treatment on the anticorrosive base material, and removing rust and oil. Then spraying the epoxy resin composite primer coating prepared by the method, wherein the thickness of the coating is about 30-50 mu m, and drying for 48 h at room temperature; then spraying the fluorocarbon composite finish paint prepared by the method, wherein the thickness of the coating is about 20-30 mu m, and drying for 48 h at room temperature; and finally, spraying the fluorocarbon varnish paint prepared by the method to obtain a coating with the thickness of about 10-20 microns, and drying for 48 hours to obtain the functional heavy-duty anticorrosive water-based coating for the steel based on graphene modification.

The invention has the beneficial effects that:

(1) the water-based paint and the water-based curing agent are adopted, so that the pollution to the environment is reduced, and the paint belongs to an environment-friendly paint.

(2) Modified graphene is added into the epoxy resin composite primer and the fluorocarbon composite finish paint, so that a labyrinth effect can be formed to prevent the external environment from contacting with equipment.

(3) The functional modification of the pi-pi bonds of the polyvinyl alcohol and the graphene is utilized, the dispersibility of the modified graphene in water is improved, the using amount of the dispersing agent is low, and the modification operation is simple and effective.

(4) The graphene is densely dispersed, so that the anticorrosive effect of the coating is improved, and the coating also has flame-retardant and fireproof performances.

(5) The graphene adopted by the invention is similar to graphene, and has simple preparation process and low cost.

(6) The graphene heavy-duty anticorrosive water-based paint provided by the invention not only keeps the main characteristics of each component, but also improves various performances of the coating through a composite effect, belongs to a comprehensive functional anticorrosive material, and has the advantages of simple preparation, convenience in operation and high applicability.

Drawings

FIG. 1 shows the spraying effect of the functional heavy-duty water-based paint for steel modified by graphene obtained in example 2 of the present invention.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following examples.