A low mobility UV-LED benzophenone photoinitiator

With the increase frequency of food safety incidents caused by migrating photoinitiators over the past few years, as well as people's growing awareness of safety and environmental protection, the development of low-migration UV-LED photoinitiators has become increasingly crucial. A photoinitiator 3-vinyl-4-dimethylaminobenzophenone (NVBP) with both hydrogen donor and polymerizable double bond group was prepared and characterized by 1H NMR and 13C NMR. A systematic study of the photopolymerization kinetics of NVBP was explored by the Real-Time Fourier Transform Infrared Spectrometer. The results showed a good initiation efficiency of acrylate monomers under 365 nm/405 nm light source with double bond conversion up to 94.6 % and 79.7 %. In addition, NVBP has low mobility, which is important to facilitate photoinitiator applications. This work proves that NVBP is an excellent UV-LED photoinitiator.