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China has become a big country in UV curing materials

China has become a big country in UV curing materials

August 28, 2008

[China paint information] radiation curing refers to ultraviolet (UV) and electron beam (EB) curing, which is an advanced material surface treatment technology. It uses uv/eb to initiate the rapid polymerization and cross-linking of chemically active liquid materials, and instantly solidifies into a film. Since then, there has been a hydraulic 4-ball experimental machine. In 1968, Bayer company of Germany first developed light curing wood coatings, and the light curing technology has been industrialized. It has been less than 40 years, but it has a rapid development momentum in the world, and its application fields have been expanding, forming a new industry. Uv/eb curing technology with "5E" characteristics, marked by high efficiency, wide adaptability, economy, energy conservation and environmental friendliness, has become a new green industrial technology in the 21st century. China's UV curable materials were toughened in the early 1970s and industrial production in the 1990s. At the end of the last century, a new industry was initially formed and achieved rapid development; At present, it has become a major manufacturer of UV curing raw materials and products after the United States and Japan. Active diluents and photoinitiators in UV curing raw materials are exported in large quantities, among which photoinitiators have become the largest producer and exporter in the world

as an advanced material surface treatment technology that informs ultraviolet (UV) and electron beam (EB) curing, uv/eb instantly solidifies into a film in the process of initiating rapid polymerization and crosslinking of chemically active liquid materials. This new technology was first developed by Bayer in 1968, and then the UV curing technology was industrialized. It has developed rapidly and its application has been expanding in less than 40 years. At present, it has become a new industry. At the North American International Conference on radiation curing held in May, 2004, uv/eb curing technology was summarized as an industrial technology with "5E" characteristics: efficient, enabling wide adaptability, economic economy, energy saving, environmental friendly. Uv/eb curing technology is known as a new green industrial technology facing the 21st century. In developed countries and regions such as North America, Europe and Japan, enterprises engaged in uv/eb production have developed rapidly and have formed industries with a certain market scale, in which UV curing accounts for about 95% and EB curing accounts for about 5%. At present, the output of radiation curing products in North America, Europe and Japan is 90000 tons respectively, and the tensile testing machine industry is also vigorously exploring this aspect, 90000 tons and 50000 tons

China's UV curing material industry started late and developed rapidly. This industry in China began in the early 1970s and began to realize industrial production in the 1990s; In 1993, the radiation curing branch was established, and now it is the radiation curing Professional Committee of the Chinese Photographic Society; By the end of last century, China had initially formed a new industry and entered a new stage of rapid development. In recent years, although the impact of abnormal raw material price increases due to the rise in oil prices and c-enoic acid anti-dumping with the release of "made in China 2025", the UV curing industry is still developing and growing. In 2004, the total output of UV curing raw materials has reached about 8 tons, and the total output of UV formula products has reached about 5 tons. China has become a major manufacturer of UV curing raw materials and products, second only to the world's leading United States and Japan; Active diluents and photoinitiators in curing raw materials have been exported in large quantities, especially photoinitiators have become the largest producer and exporter in the world

Although UV curing technology and materials have developed rapidly, some problems still affect its application and promotion. There are mainly the following aspects: first, active diluents are irritating to human skin, mucosa and eyes, and some have a bad smell; Second, the viscosity of oligomers is large, so the coating process is special, which requires adding a large amount of active diluents and sometimes organic solvents, which is unsafe and pollutes the environment; Third, the UV curing system is mainly free radical photopolymerization, which is incomplete due to oxygen polymerization inhibition, and there are still active diluents in the cured coating, so the traditional UV curing materials are not suitable for the printing and coating of food hygiene product packaging materials. At present, no UV curing products have been approved by the U.S. Food and Drug Administration (FDA); Fourth, raw materials for UV curing are expensive; Fifth, due to the use of free radical photopolymerization system, the curing speed is fast, and the volume shrinkage after curing is large, which affects the adhesion between the film and the substrate. In addition, the size, density and thickness of the honeycomb can be adjusted through simple hardware or process parameters

in addition, due to the absorption, reflection and scattering of light by the pigment, the curing speed is affected and the curing is difficult, while organic solvents are required for the cleaning of oily UV curing material coating equipment and containers. Of particular concern is the damage of active diluents and volatile organic compounds to human body and environmental pollution. In order to overcome these disadvantages, a novel UV curing system - aqueous UV curing system came into being. Water based UV curing system inherits and develops the advantages of traditional UV curing technology, water-based coating and ink technology. It has become a very active field of UV curing technology research and development, and has been applied in practice. In the future, the development of domestic UV curable materials will move towards waterborne, and the progress of Waterborne UV curable materials will be reflected in four aspects: the application of hyperbranched polymers, mainly for Waterborne UV curable oligomers; Macromolecules and polymerizable photoinitiators mainly solve the problems of appropriate food and sanitary packaging materials; Dual curing system, which mainly realizes the curing of three-dimensional coating, thick coating and colored coating; The application of nano materials is mainly used to modify water-based UV curable coatings, improve and improve coating performance, which is the focus of the application and development of water-based UV curable coatings

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