Study on Synthesis of Polysiloxane Urethane Acrylate Prepolymer

Anovel photosensitive polysiloxane urethane acrylate(PSUA) was synthesized from isophorone diisocyanate(IPDI) ,alkylhydroxyl-terminated polydimethysiloxane(SD9134) and hydroxyethyl acrylate(HEA) .The influences of amount of raw materials, dosage of catalyst and temperature on the reaction were investigated.The results showed that the optimal reaction conditions were as follows:taking IPDI and SD9134 as main feedstock with 0.05%～0.1% of DBTDL as catalyst.The reaction temperature should be kept between 20℃ and 40℃ at the former three steps and below 70℃ at the last step.The structure of PSUA was characterized by IR and GPC.