Synthesis of tri-functional polyurethane acrylates containing phosphorus and properties of their UV cured films

The tri-functional polyurethane acrylates containing phosphorus were obtained by the reaction of trieth-ylene glycol phosphate prepared from phosphorus oxychloride and ethylene glycol,and polyurethane acrylates with isocyanate group prepared from isophorone disocyante,hydroxyl-terminated polypropylene glycol or poly( 1,4-butylene dipate) and hydoxyethyl acrylate. The products were characterized by FT-IR. The properties of coatings prepared from the products and tripropylene glycol diacrylate were also investigated. The results showed that the coatings from two products had certain performance difference,but they all had good UV curing properties. The various physical properties of the cured films were excellent and the thermal stability was good. The char yield of the films was above 7. 8% at 480 ℃.