Current situation and development of steel drum pa

Current situation and development of steel drum packaging coatings in China continued

IV. progress of UV curable coatings

UV curable coatings are also a solvent-free and energy-saving coating. Originally, they were mainly used for wood and furniture. At present, they have been widely used in the coating field of wood and plastic packaging products. In Europe and developed countries, the UV curing type has great market potential and is favored by large enterprises, mainly due to the needs of flow operations. There are more than 700 large UV curing coating lines in the United States, and about 40% of wood or plastic packaging materials in Germany and Japan use UV curing coatings. Recently, polyurethane acrylic acid light curing coating has been developed, which is made by dissolving polyurethane oligomer with acrylate end group in active diluent (photopolymerizable acrylic monomer). It not only maintains the characteristics of acrylic resin UV curing coating, but also has particularly good flexibility, adhesion, chemical corrosion resistance and wear resistance

v. the trend and development of several special coatings

1. Antifouling coatings

in recent years, sigma company in the Netherlands has successfully developed a new type of antifouling coating without Tin. Its self polishing property is the same as that of the existing antifouling coatings with tin, but its anti shrinkage and anti cracking properties are much better than other antifouling coatings without Tin. Recently, Kansai coating company in Japan developed a non-toxic antifouling coating called captain crystal, which does not contain organic tin and cuprous oxide. As a source of this kind of painting to improve the earth's environment: MIT materials can effectively prevent the pollution of packaging, and the duration can be up to 5 years. The Japanese oil company has successfully developed a new type of anti pollution and acid rain resistant PCM coating by using super crosslinking technology. Experiments have proved that this technology can make automotive coatings have excellent pollution resistance, its weather resistance is eight times that of acrylic resin series coatings, and its film hardness can reach 3 ~ 4H

2. Anticorrosive coatings

foreign countries attach great importance to the development of long-term anticorrosive coatings. The main varieties include inorganic zinc rich paint, epoxy asphalt, vinyl resin, thick paste chlorinated rubber, solventless epoxy polyamide, solventless epoxy mortar and spguard coating. A long-term anti-corrosion coating composed of bisphenol A epoxy resin, isophthalic acid unsaturated polyester, epoxy acrylic resin and other base materials filled with 20% - 30% flake glass powder is used for the coating of marine facilities, and its anti-corrosion life is more than 10 years. In recent years, the development of anticorrosive coatings in China is relatively fast. For example, the epoxy coal tar pitch anticorrosive coating has been successfully developed by Shaanxi Yuanyuan Chemical Co., Ltd. the coating has strong adhesion and can be directly painted on the steel with rust layer, with good anticorrosive effect. The oil field anti-corrosion coating was successfully developed by Zhengzhou Institute of technology and Zhongyuan Oilfield Exploration and Design Institute. The coating has excellent corrosion resistance and good low-temperature moisture curing characteristics. As a high-tech technology, organic titanium coating is usually produced for Shanghai Vientiane Automobile Manufacturing Co., Ltd. according to the measured brittleness of the material. The corrosion resistance of this non-toxic organic titanium coating has reached the level of similar foreign products, and can be used for anti-corrosion equipment in chemical, marine and other fields

nowadays, coating products for packaging are widely used as raw materials from petroleum industry, coking industry, organic synthetic chemical industry and other departments. There are more and more varieties, and the scope of application is also expanding. The coating industry has become an important independent production industrial department in the chemical industry. At present, the output of coatings in China is more than 2million tons, of which industrial coatings account for 60%. In recent years, the demand has increased at an average rate of 3.4%

with the continuous improvement of scientific and technological level, a variety of new raw materials and technical equipment are provided for the coating industry, which promotes the rapid improvement of the production level and technical level of the coating industry. At present, the packaging industry using paint is developing at a high speed, which constantly puts forward higher requirements for paint products as protective and decorative materials

in the early 1990s, the developed countries in the world carried out a "green revolution", which was a challenge to the coating industry and promoted the development of the coating industry to stride forward in the direction of "green" coating. Taking industrial coatings as an example, in North America, conventional solvent based coatings accounted for 49% in 1992 and 26% in 2000; Water based coatings, high solid coatings, UV curable coatings and powder coatings will increase from 51% in 1992 to 74% in 2002. In Europe, conventional solvent based coatings will drop from 49% in 1992 to 27% in 2002; Water based coatings, high solid coatings, UV curable coatings and powder coatings will increase from 51% in 1992 to 73% in 2002. In the next decade, water-based coatings are mature technologies, while solvent based coatings with a solid content of less than 60% are declining technologies

at present, one of the directions of coating research is the automation of coating application, which provides products with simple and safe construction, especially the automation of product brushing; The second is to develop in the direction of environmental friendly coatings; The third is to add new components, so that the coating will have new chemical changes after coating to form the film, and will change from a single construction can only get a thin coating to a thick coating. The number of film layers will also be simplified from cumbersome multi-channel supporting to simple construction. The drying process of the film will also use all kinds of physical and chemical reverse Universal Experimental machines. The most common items tested are tensile strength and tensile modulus The flexural strength and modulus should be greatly shortened