Photoinitiator also known as photosensitizer or photocuring agent, is a type of light that absorbs certain wavelengths in the ultraviolet (250-420 nm) or visible (400-800 nm) regions. Energy, which generates free radicals, cations, etc., thereby initiating polymerization of a monomer by crosslinking. In the photocuring system, including UV glue, UV paint, UV ink, etc., after receiving or absorbing external energy, it undergoes chemical changes and decomposes into radicals or cations, thereby initiating polymerization.
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