Photodecarboxylation In Uv-curable Waterborne Coating

摘要

The attractive UV-curable waterborne coating, a kink of environment-friendly coating, could be simultaneously improved in water resistance after being UV cured using the photodecarboxylation technique. In present research, the intermolecular photodecarboxylation mechanism between alpha-carboxyl thioether and type II photoinitiator was revealed with GC-MS. Monomethyl thioether (CH3-S-R) and thioethylene ether (R-S-CH2CH2-S-R) were found to be the primary photodecarboxylation products. An acrylated oligomer with alpha-carboxyl thioether was synthesized and formulated into UV-curable waterborne coating, in which ITX was employed as photoinitiator and photodecarboxylation accelerator.