Business agency December 16 news today more and more paint varieties, more and more applications. The annual production of coatings in China is about 2 million tons, of which 60% of industrial coatings are industrial. In recent years, the demand has increased at an average rate of 3.4%.
At present, the application of coatings in aviation, shipbuilding, vehicles, machinery, electronic industry and other fields has developed rapidly, and new and higher requirements for coating products are constantly put forward. For example, the aviation industry requires coating industry to provide coating varieties that can adapt to supersonic flight, which have high wear resistance, high temperature resistance and sudden cooling resistance; space technology requires coating resistant to thousands of degrees Celsius high temperature and cosmic ray radiation; electronic industry requires high temperature resistant absolute materials; Shipbuilding industry requires providing marine coatings with high corrosion resistance and longer service life, such as anti pollution coating at the bottom of the ship; automotive industry requires coating suitable for improving driving speed and excellent protection and decoration performance in various climate environment; petrochemical and machinery manufacturing industry requires providing highly chemical resistant coating. The continuous improvement of the technology level also provides a variety of new raw materials and technical equipment for the coating industry, which promotes the rapid improvement of the production and technical level of the coating industry.
In the 1990s, the "green revolution" emerged in the world, which promoted the coating industry to stride forward to the direction of "green". Taking industrial coatings as an example, in North America, the proportion of conventional solvent based coatings in 1992 accounted for 49%, which will be reduced to 26% this year; the proportion of water-based coatings, high solid coatings, light curing coatings and powder coatings will be 51% in 1992 and 74% this year. In Europe, the proportion of conventional solvent coatings is 49% in 1992, and will be reduced to 27% this year; the proportion of water-based coatings, high solid coatings, light curing coatings and powder coatings will be 51% in 1992 and 73% this year. In the next 10 years, the production technology of water-based coatings will be mature, and solvent coatings with solid content of less than 60% will be in decline.
At present, the direction of coating research: first, the application automation of coatings, the products provided are simple and safe to construct, especially the product coating should be automated; the second is to develop towards environmental protection coatings; Third, add new composition to make the coating form a new chemical change after coating, and change from one construction to the thick coating. The number of coating layers will be simplified from Complicated Multi-channel matching to simple construction. The drying process of film will also be greatly shortened by various physical and chemical reactions.
Water based coatings: because of the outstanding advantages of water-based coatings, they have been widely used in the field of general industrial coatings in recent 10 years, and many commonly used solvent coatings have been replaced. With the increasing restrictions on VOCs and toxic substances in various countries, as well as the optimization of resin and formulation and the development of applicable additives, it is expected that the water-based coatings will make breakthrough progress in the field of metal antirust coating, decorative coating, building coating and other alternative solvent coatings. In water-based coatings, latex coatings have advantages, such as the United States of America, which accounts for 90% of architectural coatings. The research results of emulsion coating account for about 20% of the total coatings research results. Water-based polyurethane coating is a kind of water-based coating which has been developed rapidly in recent years. Besides the high strength and wear resistance of general polyurethane coating, it has little risk of pollution, poisoning and fire. The flexibility, mechanical strength, wear resistance, chemical resistance and durability of waterborne polyurethane coatings are excellent. Europe, the United States and Japan all regard it as a high-performance modern coating variety.
Powder coating: in the coating industry, powder coating belongs to the rapid development of a class. Due to the serious air pollution in the world, environmental protection regulations are increasingly strict in pollution control, which requires the development of non pollution and provincial resources of paint varieties. Therefore, the powder coating with comprehensive protection and decoration performance without solvent has been developed rapidly because of its economic and social benefits. The main varieties of powder coating are epoxy resin, polyester, acrylic acid and polyurethane powder coating. In recent years, polyurethane powder coating has attracted great attention for its excellent performance.
High solid coatings: with the increasing environmental protection measures, high-solid coatings have developed rapidly, among which the application of amino, acrylic and amino acrylic coatings is more common. In recent years, moBay company has developed a new type of finishing paint for automobile assembly line. The polymer system with high solid content and single component polyurethane can be used on rigid and flexible base materials, and has excellent acid resistance, hardness and pigment kneading property.
Light curing coating: the light curing coating is also a kind of paint which does not use solvent but saves resources, mainly used for wood furniture, etc. Among the developed wood furniture paint varieties, the market potential of light curing coating is large, and it is very popular with large enterprises. Due to the need of wood furniture flowing in water, there are more than 700 large-scale light curing coating lines in the United States, and about 40% of furniture in Germany and Japan are light curing coating.
Antifouling coating: in recent years, sigma company of the Netherlands has developed a new type of tin free antifouling coating. Its self polishing property is the same as the existing tin containing antifouling coating. Recently, a new marine antifouling coating developed by Guanxi coating company of Japan can effectively prevent biological attachment to the bottom of the ship for up to 5 years.
Anticorrosive coating: foreign countries attach great importance to the development of long-term anti-corrosion coating, mainly including inorganic zinc rich paint, epoxy asphalt, vinyl resin, thick slurry chlorinated rubber, solvent-free epoxy polyamide and solvent-free epoxy mortar coating. The long-term anti-corrosion coating composed of bisphenol A epoxy resin, m-benzoic acid unsaturated polyester and epoxy acrylic resin was filled with 20% - 30% sheet glass powder. The anticorrosive life of the coating was over 10 years.
Cathodic electrophoresis coating: this kind of coating has developed rapidly abroad and has made many new achievements. Among them, the thick film type, low temperature curing and color negative electrophoresis coatings have been developed. Thick film negative electrophoresis coating is a new type of negative electrophoresis coating developed by PPG company in the United States. It has thick film formation, smooth appearance and excellent performance. Low temperature curing anionic electrophoresis coating is a new type developed by Shendong coating company and Japanese oil company in the late 1980s. The standard curing conditions of the coating are 130 / 20 minutes or 160 / 5min. The color negative electrophoresis coating is developed by Kansai coating company of Japan. Based on epoxy resin, it is crosslinked with special isocyanate and is combined with third component acrylic resin, which can be uniformly deposited in electrophoresis to form composite coating. The technology can make the epoxy resin anion killing electrophoresis coating color, and improve the weather resistance of the coating. The edge rust proof cathodic electrophoresis coating requires reducing the fluidity of the film melting and improving the edge coverage of the film, so as to improve the corrosion resistance of the edge edges of the coating. In China, we should focus on the development of thick film type and ordinary type of electro swimming paint with thickness of 30-40 microns and salt fog resistance of 1000h and ordinary ones with salt fog resistance of 720h or more.
Coating accessories: in order to meet the needs of improving the performance of coating products and increasing varieties, we should constantly improve the performance of the required pigments, and make more extensive use of organic pigments, such as azo, phthalocyanine and anthraquinone pigments with excellent sun and solvent resistance. It is also more and more important to expand the use of auxiliary materials in coatings. For example, UV absorbers can improve the light resistance; antioxidants can improve the aging resistance; with the development of water-based coatings, the varieties of wetting agents will be expanded; in the use of UV drying coatings, the use of photocuring agents is needed. These auxiliary materials will be used more widely in the future.
At present, the application of coatings in aviation, shipbuilding, vehicles, machinery, electronic industry and other fields has developed rapidly, and new and higher requirements for coating products are constantly put forward. For example, the aviation industry requires coating industry to provide coating varieties that can adapt to supersonic flight, which have high wear resistance, high temperature resistance and sudden cooling resistance; space technology requires coating resistant to thousands of degrees Celsius high temperature and cosmic ray radiation; electronic industry requires high temperature resistant absolute materials; Shipbuilding industry requires providing marine coatings with high corrosion resistance and longer service life, such as anti pollution coating at the bottom of the ship; automotive industry requires coating suitable for improving driving speed and excellent protection and decoration performance in various climate environment; petrochemical and machinery manufacturing industry requires providing highly chemical resistant coating. The continuous improvement of the technology level also provides a variety of new raw materials and technical equipment for the coating industry, which promotes the rapid improvement of the production and technical level of the coating industry.
In the 1990s, the "green revolution" emerged in the world, which promoted the coating industry to stride forward to the direction of "green". Taking industrial coatings as an example, in North America, the proportion of conventional solvent based coatings in 1992 accounted for 49%, which will be reduced to 26% this year; the proportion of water-based coatings, high solid coatings, light curing coatings and powder coatings will be 51% in 1992 and 74% this year. In Europe, the proportion of conventional solvent coatings is 49% in 1992, and will be reduced to 27% this year; the proportion of water-based coatings, high solid coatings, light curing coatings and powder coatings will be 51% in 1992 and 73% this year. In the next 10 years, the production technology of water-based coatings will be mature, and solvent coatings with solid content of less than 60% will be in decline.
At present, the direction of coating research: first, the application automation of coatings, the products provided are simple and safe to construct, especially the product coating should be automated; the second is to develop towards environmental protection coatings; Third, add new composition to make the coating form a new chemical change after coating, and change from one construction to the thick coating. The number of coating layers will be simplified from Complicated Multi-channel matching to simple construction. The drying process of film will also be greatly shortened by various physical and chemical reactions.
Water based coatings: because of the outstanding advantages of water-based coatings, they have been widely used in the field of general industrial coatings in recent 10 years, and many commonly used solvent coatings have been replaced. With the increasing restrictions on VOCs and toxic substances in various countries, as well as the optimization of resin and formulation and the development of applicable additives, it is expected that the water-based coatings will make breakthrough progress in the field of metal antirust coating, decorative coating, building coating and other alternative solvent coatings. In water-based coatings, latex coatings have advantages, such as the United States of America, which accounts for 90% of architectural coatings. The research results of emulsion coating account for about 20% of the total coatings research results. Water-based polyurethane coating is a kind of water-based coating which has been developed rapidly in recent years. Besides the high strength and wear resistance of general polyurethane coating, it has little risk of pollution, poisoning and fire. The flexibility, mechanical strength, wear resistance, chemical resistance and durability of waterborne polyurethane coatings are excellent. Europe, the United States and Japan all regard it as a high-performance modern coating variety.
Powder coating: in the coating industry, powder coating belongs to the rapid development of a class. Due to the serious air pollution in the world, environmental protection regulations are increasingly strict in pollution control, which requires the development of non pollution and provincial resources of paint varieties. Therefore, the powder coating with comprehensive protection and decoration performance without solvent has been developed rapidly because of its economic and social benefits. The main varieties of powder coating are epoxy resin, polyester, acrylic acid and polyurethane powder coating. In recent years, polyurethane powder coating has attracted great attention for its excellent performance.
High solid coatings: with the increasing environmental protection measures, high-solid coatings have developed rapidly, among which the application of amino, acrylic and amino acrylic coatings is more common. In recent years, moBay company has developed a new type of finishing paint for automobile assembly line. The polymer system with high solid content and single component polyurethane can be used on rigid and flexible base materials, and has excellent acid resistance, hardness and pigment kneading property.
Light curing coating: the light curing coating is also a kind of paint which does not use solvent but saves resources, mainly used for wood furniture, etc. Among the developed wood furniture paint varieties, the market potential of light curing coating is large, and it is very popular with large enterprises. Due to the need of wood furniture flowing in water, there are more than 700 large-scale light curing coating lines in the United States, and about 40% of furniture in Germany and Japan are light curing coating.
Antifouling coating: in recent years, sigma company of the Netherlands has developed a new type of tin free antifouling coating. Its self polishing property is the same as the existing tin containing antifouling coating. Recently, a new marine antifouling coating developed by Guanxi coating company of Japan can effectively prevent biological attachment to the bottom of the ship for up to 5 years.
Anticorrosive coating: foreign countries attach great importance to the development of long-term anti-corrosion coating, mainly including inorganic zinc rich paint, epoxy asphalt, vinyl resin, thick slurry chlorinated rubber, solvent-free epoxy polyamide and solvent-free epoxy mortar coating. The long-term anti-corrosion coating composed of bisphenol A epoxy resin, m-benzoic acid unsaturated polyester and epoxy acrylic resin was filled with 20% - 30% sheet glass powder. The anticorrosive life of the coating was over 10 years.
Cathodic electrophoresis coating: this kind of coating has developed rapidly abroad and has made many new achievements. Among them, the thick film type, low temperature curing and color negative electrophoresis coatings have been developed. Thick film negative electrophoresis coating is a new type of negative electrophoresis coating developed by PPG company in the United States. It has thick film formation, smooth appearance and excellent performance. Low temperature curing anionic electrophoresis coating is a new type developed by Shendong coating company and Japanese oil company in the late 1980s. The standard curing conditions of the coating are 130 / 20 minutes or 160 / 5min. The color negative electrophoresis coating is developed by Kansai coating company of Japan. Based on epoxy resin, it is crosslinked with special isocyanate and is combined with third component acrylic resin, which can be uniformly deposited in electrophoresis to form composite coating. The technology can make the epoxy resin anion killing electrophoresis coating color, and improve the weather resistance of the coating. The edge rust proof cathodic electrophoresis coating requires reducing the fluidity of the film melting and improving the edge coverage of the film, so as to improve the corrosion resistance of the edge edges of the coating. In China, we should focus on the development of thick film type and ordinary type of electro swimming paint with thickness of 30-40 microns and salt fog resistance of 1000h and ordinary ones with salt fog resistance of 720h or more.
Coating accessories: in order to meet the needs of improving the performance of coating products and increasing varieties, we should constantly improve the performance of the required pigments, and make more extensive use of organic pigments, such as azo, phthalocyanine and anthraquinone pigments with excellent sun and solvent resistance. It is also more and more important to expand the use of auxiliary materials in coatings. For example, UV absorbers can improve the light resistance; antioxidants can improve the aging resistance; with the development of water-based coatings, the varieties of wetting agents will be expanded; in the use of UV drying coatings, the use of photocuring agents is needed. These auxiliary materials will be used more widely in the future.
