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Photoinitiator (PI) is the key component of UV curing materials, which plays a decisive role in the speed of UV curing. Photoinitiator is a kind of material which can absorb radiation energy and produce active intermediates (free radicals or cations) with the ability of initiating polymerization. Photoinitiators can be divided into ultraviolet initiators (absorption ultraviolet region 250-420 nm) and visible initiators (absorption visible region 400-700 nm) due to different absorption radiation energy. Photoinitiators can be divided into two types: free radical photoinitiators and cationic photoinitiators. The free radical photoinitiators can be divided into two types: pyrolysis photoinitiators and hydrogen abstraction photoinitiators because of the different mechanism of producing free radicals. At present, the UV curing technology is mainly UV curing, and the photoinitiator used is UV initiator.
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