Uv curing principle       
The first patent for ultraviolet (UV) curable coatings was born in 1947. After half a century of development, UV curable coatings have become a relatively mature technology, especially with the improvement of people's environmental awareness, production and researchers pay more attention to the development and application of UV curable coatings. UV curable coating is a kind of green and environmental protection coating, which fully conforms to the "4E" principle. Generally, the energy consumption of UV curable coating is 1/5 of that of thermal curable coating, and UV curable coating contains less volatile components and less pollution. The most attractive thing for researchers and developers is that UV curable coating can reduce the consumption of raw materials, which is conducive to reducing economic costs.
UV curable coatings are mainly composed of oligomers, monomers, photoinitiators and auxiliaries. The main reaction process of UV curable is the decomposition of photoinitiator caused by radiation, which generates active free radical triggering monomer/oligomer polymerization crosslinking.     

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