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UV varnish consists of three parts: photosensitive resin, reactive diluent and photoinitiator. Under UV irradiation, free radical chain reaction can occur. All components of the coating component participate in the reaction and crosslink polymerization quickly, and the film is cured. Therefore, UV varnish has no VOC emissions; at the same time, due to the high density of intermolecular crosslinking during the curing of UV varnish, the film formation performance is excellent, not only the gloss is high, but also the wear resistance, water and oil resistance, film fullness, film strength All other coatings are incomparable.
The most prominent problem when using UV varnish is the viscosity problem, and the high viscosity was once the main reason for the limited application of UV varnish. The UV varnish consists of three parts, the main component of which is the photosensitive oligomer resin. Due to the reasons of synthesis, the viscosity of the oligomer is generally higher, so the active diluent is used for dilution and viscosity reduction, although the active diluent is cured. Participate in the cross-linking reaction, but the amount of addition can only be controlled within a certain range of the ratio. The increase in the amount of over-conference will affect or even change the film forming performance.
In paper printing decoration, the most commonly used UV coating method is silk screen coating and offset printing. UV screen printing general screen mesh number 350-450 mesh, light oil viscosity of 1100 ± 100CPS (25 °C). Offset varnish printing viscosity is generally required in 30-40 seconds (25 °C, coated -4 cups), the maximum not more than 50 seconds, the viscosity is too high will affect the leveling properties of varnish. General UV Varnish can meet the printing requirements at room temperature, but when the temperature is low, the viscosity of UV Varnish is too large, and it must be reduced by heating. Now the general UV coating machine is equipped with a heating device. Varnish heated to 45-55 °C, the viscosity can generally be adjusted to the scope of use. Unfortunately, in order to reduce the cost, many manufacturers add a certain amount of solvent to UV varnish to reduce the use of varnish. One way to do this is to increase environmental pollution and secondly to affect the effect of glazing. The addition of solvent will affect the gloss and curing time, and also have some influence on the adhesion.
At present, the use of water-based glazing in gravure printing and less use of UV varnish are the main reasons for this. There are two main reasons. First, UV varnish is difficult to achieve a lower viscosity, and the second is curing. It is difficult to meet the high-speed printing requirements of 120 meters/minute or more. The gravure printing process is not only fast, but also has a low light oil consumption and a lower cost, and is more suitable for the printing of large-volume prints. As UV Varnish has a better gloss finish, people have been looking for UV Varnish that can meet gravure printing process requirements. In the past two years, foreign related products have entered China, but large-scale applications have not yet begun.
Wuhan University and Wuhan Desai High-tech Research and Development Co., Ltd., after many years of research, have overcome the difficulties in synthesizing ultra-low-viscosity oligo-oligomer resins. This technology has greatly reduced the viscosity of UV-varnishes. The curing rate of oil is nearly 4 times higher than that of general UV varnish. The gravure UV varnish synthesized in this way has achieved very satisfactory results in gravure printing applications. The quality of the product has completely met the quality standards of imported products, and has made outstanding contributions to the development of gravure UV coating in China.
Wuhan Desai High-Tech Research and Development Co., Ltd. is a professional company specializing in the research and development of special acrylic resins and various modified acrylic resins. The company's Desaiite series of printing varnishes has three major categories of more than twenty varieties. The company is led by several doctors returning from the United States to study abroad. Through extensive cooperation with Wuhan University and Peking University, the company has always been at the forefront in the development of special resins and special printing coatings. The company developed and produced non-slip wear resistant waterborne varnishes and high temperature resistant flexo waterborne varnishes that completely exceeded the imported products. The technology of the products is at the leading international level, making China's high-end packaging production enter the international advanced ranks. Desai Company is also at the international advanced level in the research and development of super weathering resist waterborne varnish, wet/wet high speed varnish waterborne varnish. In the production of cigarette packaging, food packaging, pharmaceutical packaging, alcoholic beverage packaging, and electrical packaging, Desaite products have been well received by customers for its complete range, stable performance and excellent technical services.
Wuhan Desai High-tech Research and Development Co., Ltd. has achieved remarkable success in the research and development of UV photosensitive resins and UV-curable coating oils. The most outstanding research results are DS1201 waterborne UV varnish and DS102 gravure UV varnish. The water-based UV varnish reduces the irritation of the UV varnish to the human body and can be washed with water during use, which reduces the use of cleaning solvents during the use of the product and further improves the environmental health level. Gravure printing UV varnish with viscosity of 18-20 seconds (25 °C, coated - 4 cups), curing time can meet the printing requirements of 120-160 meters / minute, good product leveling, high gloss, strong adhesion , is the ideal product of imported products.
Wuhan Desai High-Tech Research and Development Co., Ltd. establishes a technology research center at Wuhan University. Through cooperation with professors and professors at Wuhan University, the company continuously innovates and strives to forge ahead to "continually improve product performance, strengthen technical services, help customers create value, and The aim is to establish a lasting partnership and continuously improve customer satisfaction. Each year, a large amount of funds are spent on the development of new products and technologies to improve the performance of products and grasp the pulsation of customer needs; creative improvements in sales, technical services, and supply have ensured that the company can always solve problems for customers. Provide timely, effective and comprehensive solutions. According to the needs of customers, the company dispatches professional and technical personnel to provide on-site service at any time to provide guidance for product use and actively assists customers in solving problems encountered in the printing process.
Wuhan Disai R&D Special Gravure UV Curing Varnish
UV light curing glazing coating is one of the three most popular environmental protection coatings that have been accepted and respected by waterborne coatings and powder coatings. Because of its unique low-temperature fast curing properties and superior decorative effects, it has become more widely used in many industries. . The application of UV Varnish on paper printing has been in the country for nearly a decade, and has become an important means of post-press decoration. After the plastic laminating process was phased out due to environmental issues, UV glazing was the only process that could achieve the texture of the lamination. UV Varnish can not only be filled with light, but it can also be applied locally. But also according to the need for printing on the part of the thickening modification, the formation of a special accumulation effect, which is the other coating oil can not be achieved. In today's pursuit of quality and artistic effects, the amount of UV Varnish is becoming wider and wider, with more and more varieties of special functions and decorative effects becoming more and more abundant.