水性聚氨酯丙烯酸酯复合乳液的合成研究

采用种子溶胀乳液聚合法,以水性聚氨酯为种子,甲基丙烯酸甲酯和丙烯酸丁酯为单体制备水性聚氨酯丙烯酸酯复合乳液,考察了聚合温度、搅拌速度、引发剂种类、引发剂用量及反应时间对聚合过程的影响.结果表明:适宜的聚合温度控制为85℃;适宜的搅拌速率为150～250 r/min;采用水溶性引发剂时引发效率较高,过硫酸钾的最佳用量为0.8%;随着反应时间的增加,乳液粒径先减小后增大.用红外光谱对聚氨酯丙烯酸酯乳液进行分析,表明丙烯酸酯参与了反应.

Synthesis of Waterborne Polyurethane-acrylate Composite Emulsions

Polyurethane-acrylate composite emulsions were synthesized by seed swelling polymerization with aqueous polyurethane dispersion as seed,methyl methacrylate and butyl acrylate as vinyl monomers.The influences of polymerization temperature,stirring rare,the species and content of initiator and the reaction time on the polymerization process were investigated.The results showed that the suitable polymerization temperature was 85 ℃ and the stirring rare were between the 150～250 r/min;the initiating efficiency of the water-soluble initiator was higher,and the optimum content of potassium persulphate was 0.8%.The latex particle size decreased and then increased with the increase of reaction time.In addition the arylate was found in polyurethane-acrylate emulsion by FT-IR.