水性聚氨酯-丙烯酸酯共聚乳液的制备及性能研究

摘要

以甲苯二异氰酸酯 (TDI) , 聚醚二元醇 (N220) 、二羟甲基丙酸 (DMPA) 反应得到异氰酸根封端的聚氨酯, 并用丙烯酸羟丙酯 (HPA) 对其部分封端得到双键封端的聚氨酯预聚体, 加入甲基丙烯酸甲酯 (MMA) , 使其与聚氨酯预聚体自由基聚合以制得聚氨酯-丙烯酸酯 (PUA) 共聚乳液.研究了PUA薄膜的力学性能和玻璃化温度, 发现加入MMA可以使薄膜的拉伸强度提高, 玻璃化温度有两个, 分别为-43. 32℃和123. 37℃.最后, 将PUA杂化薄膜的拉伸强度和PUA共聚薄膜的拉伸强度进行比较, 发现PUA共聚薄膜的拉伸强度在MMA含量10％-40％范围内明显强于PUA杂化薄膜.%Double bond end-coupled polyurethane was prepared with toluene diisocyanate ( TDI) , polyether diol (N220) , dimethylol propionic acid (DMPA) andhydroxypropyl acrylate (HPA) . Waterborne polyurethane-acrylate (PUA) copolymeric emulsionwas prepared by copolymerization of double bond end-coupled polyurethane with methyl methacrylate ( MMA) . Themechanical properties and glass transition temperature of PUA thin films were studied.Results showed that the PUA hadhigher tensile strength than those of PU. PUA showed two glass transition temperatures-43. 32℃ and 123. 37℃. Tensile strengthsof PUA hybrid thin films and the PUA copolymer films were compared. It was found that the tensile strength of PUA copolymerthin films on the MMA content in the range of 10％～ 40％ were markedly improved.