How will China's architectural coatings develop in the next few years? A clear direction of development can now be seen. Nowadays, there are more and more types of coatings, and the range of applications is wider and wider In 2009, China's total coating production reached 7,554,400 tons, ranking first in the world for the first time, with a year-on-year growth of 14.1%; and architectural coatings production was 3.661 million tons, an increase of 21.19% over the same period last year. In 2009, the industrial enterprises above designated size achieved a total industrial output value of 183.5 billion yuan, a year-on-year increase of 15.8%. At present, the most widely applied areas for coating, such as aviation, shipbuilding, vehicles, machinery, and electronics industries, are rapidly developing, and new and higher requirements are constantly put forward for coating products. For example, the aviation industry requires the paint industry to provide coatings that are suitable for supersonic flight, with high abrasion resistance, high temperature resistance and quenching resistance; space technology requirements provide coatings resistant to high temperature and resistance to cosmic ray radiation of thousands of degrees Celsius; the requirements of the electronics industry Provides high temperature resistant insulating materials; shipbuilding industry requires marine coatings with a high degree of corrosion resistance and longer life, such as long-lasting non-toxic bottom antifouling paints, etc.; automotive industry requirements to provide adaptability in improving driving speed and in various climate environments Both have excellent protection and decorative properties; petrochemical and machinery manufacturing industries require highly chemically resistant coatings.
The continuous improvement in the level of science and technology has also provided a variety of new raw materials and technical equipment for the paint industry, prompting the coating industry to rapidly increase its production and technology levels. In the 1990s, the “green buzz†emerged internationally, which promoted the paint industry to make big strides toward the “green†direction. Taking industrial coatings as an example, in North America, conventional solvent-based paints accounted for 49% in 1992 and will be reduced to 26% this year; the proportions of water-based paints, high-solids coatings, photocurable coatings, and powder coatings were 51% in 1992. Increased to 74%. In Europe, the proportion of conventional solvent-based coatings was 49% in 1992 and will drop to 27% this year; the proportion of waterborne coatings, high solids coatings, photocurable coatings and powder coatings was 51% in 1992 and will increase to 73% this year. . In the next 10 years, the production technology of waterborne coatings will mature, and the solid content of solvent coatings below 60% will decline. At present, the direction of scientific research and development of coatings: First, the application of paint automation, the construction of the provided products is simple and safe, in particular, the product coating should be automated; the second is the development of environmentally friendly coatings; the third is to add new components, so that the paint is After coating, new chemical changes occur to form a coating film, and only a thin coating can be converted to a thick coating in a single application. The number of coating layers will also be simplified by simple and complicated construction and the coating film drying process. It will also greatly reduce the use of various physical and chemical reactions.
Water-based paint. Due to the outstanding advantages of waterborne coatings, its application in general industrial coatings has been expanding for the past 10 years and has replaced many commonly used solvent-based coatings. With the increasingly stringent restrictions on volatile organic compounds and toxic substances in various countries, as well as the optimization of resins and formulations and the development of suitable additives, waterborne coatings are expected to be used as substitute solvents for metal antirust coatings, decorative coatings, and architectural coatings. Type coatings will make breakthrough progress. In waterborne coatings, latex paints have an absolute advantage. For example, American latex paint accounts for 90% of architectural paints. The research results of latex paints account for about 20% of all paint research results. Waterborne polyurethane coatings are one type of waterborne coatings that have been rapidly developed in recent years. Except for the high strength and wear resistance of ordinary polyurethane coatings, they have little risk of environmental pollution, poisoning, and fire. Water-based polyurethane coatings are excellent in flexibility, mechanical strength, abrasion resistance, chemical resistance, and durability. Europe, the United States, and Japan have all regarded it as a high-performance, modern coating product. Photocurable coatings are also very resource-saving coatings that use no solvents. They are mainly used for wood furniture. Among the varieties of paints for wood furniture used in developed countries, the market for photocurable paints has great potential and is very popular among large companies. Due to the need for streamlining of wood furniture, there are currently more than 700 large-scale photo-curing coating lines in the United States, and about 40% of high-grade furniture in Germany, Japan, etc. use light-cured coatings.
Powder coating. In the coatings industry, powder coatings are the fastest growing category. Due to the serious air pollution in the world, environmental protection regulations have increasingly strict pollution control and require the development of pollution-free, resource-saving paints. Therefore, powder coatings without solvents and with comprehensive protection and decorative properties have achieved rapid development due to their unique economic and social benefits. The main varieties of powder coatings are epoxy, polyester, acrylic and polyurethane powder coatings. Polyurethane powder coatings have attracted attention in recent years for their outstanding performance. High-solids coatings are also developing: With the strengthening of environmental protection measures, high solids coatings have developed rapidly, of which the application of amino, acrylic and amino-acrylic coatings is more common. In recent years, U.S. Mobay has developed a new type of top coat for automotive assembly lines. This solids-divided, one-component polyurethane-modified polymer system can be used on rigid and flexible substrates, and has excellent acid resistance, hardness, and pigment kneadability. There are also anti-fouling coatings: In recent years, the Netherlands Sigma company developed a new type of tin-free anti-fouling paint. Its self-polishing properties are the same as those of existing tin-containing antifouling paints. Recently, Kansai Coatings Co., Ltd. of Japan developed a non-organic anti-fouling paint for marine organisms that is non-toxic to aquatic organisms and can effectively prevent organisms from attaching to the bottom of the ship for a duration of up to five years.
Cathodic electrodeposition coating. Such coatings have developed rapidly abroad and have made many new achievements. Among them, the most representative is the development of thick-film cathodic electrophoretic coatings, low-temperature curing and color cathode electrophoretic coatings. Thick-film cathodic electrodeposition coating is a new type of cathodic electrodeposition coating developed by PPG of the United States. It has a relatively thick film with a smooth appearance and excellent performance. The low-temperature-curing anion electrophoretic coating is a new product jointly developed by Japan's Shinto Paint Co., Ltd. and Nippon Oil Co., Ltd. in the late 1980s. The standard curing conditions of the paint are 130/20min or 160/5min. Color cathodic electrodeposition coating was developed by Kansai Paint Co., Japan. It is based on epoxy resin, cross-linked with special isocyanate, and accompanied by a third component acrylic resin, which can be uniformly deposited in electrophoresis to form a composite coating film. This technique can colorize the epoxy cathodic electrophoretic coating and also improve the weatherability of the coating. The edge rust-proof cathodic electrodeposition coating requires reducing the flowability of the coating film during melting and improving the edge coverage of the coating film to improve the corrosion resistance of the edge of the cathodic electrodeposition coating. China should focus on the development of thick-film cathodic electrophoretic paints with a film thickness of 30 to 40 μm, salt spray resistance of 1000 h, and ordinary cathodic electrophoretic paints with a salt spray resistance of 720 h or more.
The last is anti-corrosion coating. Foreign countries attach great importance to the development of long-term anti-corrosion coatings, the main varieties are inorganic zinc-rich paint, epoxy asphalt, vinyl resin, high-density chlorinated rubber, solvent-free epoxy polyamide and solvent-free epoxy mortar coating. Use 20%～30% flake glass powder to fill in long-term anti-corrosion coating consisting of bisphenol A epoxy resin, isophthalic acid unsaturated polyester, epoxy acrylic resin and other base materials for marine facilities coating Its antiseptic life is more than 10 years. The development of paint accessories is also worthy of attention: In order to meet the needs of improved performance and increased varieties of paint products, it is necessary to continuously improve the performance of the required pigments, and more extensive use of organic pigments, such as azo, phthalocyanine and has excellent light, Solvent-resistant lanthanide pigments. The expansion of the use of auxiliary materials in coatings has also become increasingly important for the development of coatings. Such as UV absorbers used in coatings, can improve lightfastness; antioxidants can improve the aging resistance; with the development of waterborne coatings, wetting agents will continue to expand; in the use of UV drying coatings, the need to use light curing agents. These auxiliary materials will be more widely used in the future.