Preparation and properties of novel high performance UV-curable epoxy acrylate/hyperbranched polysiloxane coatings

摘要

Novel high performance UV-curable coatings based on epoxy acrylate (EA) oligomer and hyperbranched polysiloxane (HPSi) were prepared, the effect of HPSi on the processing of uncured EA/HPSi system and integrated performance of cured resins is evaluated. Results show that a small addition of HPSi can greatly decrease the viscosity of EA oliogmer, while the viscosity almost does not reduces as the content of HPSi continuously increases owing to the interaction between HPSi and EA oligomer. The integrated performance of cured resins is closely related with the content of HPSi, those resins with suitable contents of HPSi have significantly improved toughness and stiffness as well as thermal and moisture resistance. The origin of all these changes in macro-performance are investigated and proved to be resulted from the variety in the chemical structure and crosslinking density induced by the addition of HPSi. These attractive features of EA/HPSi resins suggest that HPSi is an effective multi-functional diluent for UV-curable EA resin, and the method proposed herein is a new approach to develop high performance UV-curable coatings, solvent-free resins, etc., for cutting-edge industries.