UV curing technology is an efficient, environment-friendly, energy-saving and high-quality material surface treatment technology, which can rapidly cure and color at the speed of thousands times that of traditional coatings or inks, and form a high-strength protective film. In the UV curing market, the curing effect is determined by the light band, UV curing materials and photoinitiators. At present, UVA-LED is comparable to UV mercury lamps in terms of performance (WPE reaches 55%-70%) and price, but the key factor that has not completely replaced the mercury lamps market is mainly the coordination of UV curing materials and photoinitiators.
As the early material manufacturers mainly cooperated with the development of ultraviolet mercury lamps, the coatings and inks matched with mercury lamps have indeed become quite mature after decades of development. Although the curing principle is similar when they are converted to LED ultraviolet light sources, they will still face some technical problems, that is, the absorption peak of the initiator in traditional UV ink does not match the single wavelength emitted by UV LED lamps, and there will be adverse reactions such as yellowing and drying mismatch. Therefore, it is necessary to cooperate with the development of inks suitable for UV LED light sources, among which the ink is important. In addition, due to the single wavelength band, different wavelength bands of UVLED devices are needed for different wavelength bands of UV materials. Three problems of UV curing materials to be solved From the perspective of products and technologies, LED coatings and ink formulation technologies need to be further developed and solved, among which the three major problems that need to be solved at present are also the trend of materials in the future. An efficient, yellowing-free and economical photoinitiator matched with UVA spectrum. It can be used in food packaging, standard low mobility coatings and inks. UV LED curing coatings which are comparable to thermal curing coatings in adhesion and other physical properties.
However, from the perspective of market and commercial logic, the driving force of material manufacturers has also affected the process of curing application of UVA-LED for many years. But from 2021 to 2022, two new changes began to appear, which will have the opportunity to accelerate the penetration of UVA-LED curing. First, according to the requirements of the state for environmental protection, many local governments have adopted the policy of strengthening ozone emission reduction, and ordered to stop production and rectify the outstanding problems. Those suspected of environmental violations should be investigated and dealt with according to law. In addition, it is advocated to speed up the replacement of low-volatility raw and auxiliary materials, and guide enterprises to give priority to the use of low-volatility coatings, inks, adhesives and other raw and auxiliary materials. Compared with mercury lamp, UV LED has no ozone and mercury pollution, and is more environmentally friendly, which will help UV material manufacturers to move towards LED and develop more materials matching UV LED. Second, under the influence of multiple factors, such as double control of energy consumption and soaring coal prices, last year's "power cut tide" spread to more than 20 provinces across the country. Coupled with the demand of carbon neutrality and peak carbon dioxide emissions, the manufacturing industry has paid more and more attention to energy conservation and consumption reduction. However, mercury lamps need to be preheated and continuously lighted whether they are effectively irradiated or not, and the electricity is always consumed. However, UVA-LED can only be lit during work, which greatly saves energy consumption. This
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