Graphene has a profound application in the field of coatings

China Coatings Online News Information:
graphene application range is very broad, coatings are currently an important part of graphene in many applications. With a variety of superior performance, graphene in conductive coatings, anti-corrosion coatings, flame retardant coatings, thermal conductive coatings and high-strength coatings have a very far-reaching application prospects.
graphene is the smallest and most intense type of nanomaterial. The appearance is almost completely transparent due to its low absorption rate of only 2.3%. Graphene has excellent physical properties and higher thermal conductivity than carbon nanotubes and diamonds, at 5300W/m.K. and with an electron migration rate greater than 15,000cm2/vs at room temperature, surpassing nanotubes or silicon crystals. Graphene is the world's best known material conductive material, the resistivity is only 10-8 s cm, lower than copper or silver.
in summary, graphene has the advantages of large surface area, good conductivity, strong chemical stability, strong electrical performance and excellent thermal conductivity, once it comes out, it has attracted wide attention from all over the world. At this stage, China has initially formed graphene industrial production. Graphene applications are very broad, coatings are currently an important part of graphene in many applications. With a variety of superior performance, graphene in conductive coatings, anti-corrosion coatings, flame retardant coatings, thermal conductive coatings and high-strength coatings have a very far-reaching application prospects. Here is a brief introduction and analysis of graphene's main applications in the field of coatings., graphene in the field of conductive coatings
1. Automotive electrostectrical spray light-color primer
automotive is an important industrial products. As an integral part of automobile composition system, automotive plastic parts have a good market space. At present, car plastic parts coating is generally used in conventional air spraying operation. This paint industry is based on the gun as a tool, the use of compressed air as a carrier for production. In the production process, a large number of coatings in the form of atomization into the air, not only expensive, but also will cause more serious air pollution. For this reason, automotive and coating enterprises have been more economical, environmentally friendly new coatings as the main development goals of automotive coatings. Among them, electrostectrectrative spraying is one of the important directions.
electrostectrical spraying with electric field as the coating loader, not only the paint utilization efficiency is high, the cost is relatively low, is conducive to environmental protection, but also has the advantages of fast production speed, high decorative performance. A large part of the automobile components, such as car body, bumper, interior and exterior trim, etc., are plastic products, can not form an electric field. In order to realize the electrostectrical spraying process, it is necessary to first apply a conductive primer on the surface of the processing part, and then carry out electrostectrical spraying. At present, automotive spray conductive primers mainly make the coating conductive by adding conductive carbon black. As a result, the conductive primer color is darker, in order to be beautiful, often to spray a layer of primer to cover, and then carry out formal electrostectrical spraying. This method is complex in process and increases in cost, so it is more difficult to popularize.
the use of graphene as a conductive agent, it is able to avoid the problem of darkening the color of the primer due to the conductive agent, which is very beneficial to the improvement of static spraying in automobiles. Data show that with 2% to 4% graphene added, the primer coating value is 40 to 50, which can fully meet the color requirements of automotive electrostectrical spraying.
2. Conductive electrostectrectrecture coatings
graphene in conductive coatings is another important application area is conductive electrostectrecture coatings. The surface resistance of the coating is usually located between 106 and 109, can effectively prevent the phenomenon of electrostation conduction, so it is generally used in fire prevention, explosion prevention and other high-demanding occasions. For example, oil, chemical, railway, transportation and other industries oil storage tanks, pipelines, tankers and other oil storage, oil transmission equipment inside and outside the wall, coal mines, aviation, textiles, food and other industries equipment anti-corrosion coatings are generally used as anti-corrosion coatings, so as to maximize the prevention of equipment corrosion, but also to avoid the collection of charge to cause static electricity caused by fire accidents. Graphene is both conductive and corrosion-resistant, so it works well in electrostitive coatings., graphene in the field of anti-corrosion coatings
1. epoxy zinc-rich paint
anti-corrosion coatings have been one of the important branches of coatings, in industrial production is widely used. In the national economic production, the use of a large number of metal products make equipment anti-corrosion requirements are very high, anti-corrosion coating market demand shows a continuous upward trend. Statistics show that the global economic losses caused by corrosion each year amount to trillions of dollars, far more than the economic losses caused by natural disasters. Graphene is added to the existing epoxy anti-corrosion coating, and in addition to the original performance, the resistance, adhesion, water resistance, hardness and other indicators are improved. It is widely used in marine engineering, transportation, large-scale industrial equipment and municipal engineering facilities.
2. Water-based anti-corrosion coatings
environmental protection coatings are the main direction of current coating development. Water-based coatings have become an important development goal of environmentally friendly coatings because of their low VOC. Water-based coatings use water as a dispersant, the surface tensor is high, the film-forming film has not been ideal. Adding graphene to water-based anticorrosive coatings can improve this.3. Application of graphene in the field of flame retardant coatings
graphene monolithic secondary structure, dispersed to the lacquer film layer by layer, forming a dense isolation layer, can play a fire retardant role. If the resin is added to the coating, graphene can also be cross-linked with the resin molecules, further strengthening the isolation effect, flame retardant effect is strengthened. In addition, graphene coatings after combustion products in addition to carbon dioxide and water, but also in the original will leave a continuous distribution of carbon layer, thereby improving the flame retardant effect again. For this reason, graphene is also well used in flame retardant coatings., graphene in the field of high thermal thermal dissipation coatings
graphene has a high thermal conductivity. Adding graphene to the coating can significantly improve the thermal conductivity of the coating. Therefore, graphene modified has become an important development direction of thermal coatings. In addition, graphene than the surface area is very large, the paint film contains a certain amount of graphene, can make the paint film cooling area greatly increased, help the paint film surface and internal heat distribution, so that the internal and external temperature tends to be consistent. Graphene coatings are commonly used as thermal coatings for components in many harsh environments due to their mechanical properties, corrosion resistance and aging resistance., graphene in the field of high-strength coatings
because of the high surface area of graphene, so it has a strong adsorption force. After adding graphene to the coating, it forms a mesh structure in the process of curing the paint film, which greatly enhances the bondability of the paint film and substrate, and the paint film is more stable and stronger. The test results show that after adding graphene, the impact resistance, friction resistance, thermal conductivity, weather resistance and corrosion resistance of the coating have been greatly improved.Conclusion
With the development of society, human demand for a variety of high-performance materials will be greater and greater, graphene with its excellent physical and electrochemical properties by people's high attention, the application prospects are broad. In the coatings industry, especially in the article on conductive coatings, anti-corrosion coatings, flame retardant coatings, high-strength coatings and thermal coatings, graphene's excellent performance by manufacturers warmly welcomed the rapid development. We believe that with the graphene performance and in-depth research in the field of coatings, graphene in the field of coatings will certainly get a broader space for development, resulting in more prominent performance, to promote the further upgrading of the coating industry.
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