水溶性单体共聚法制备无皂苯丙乳液的研究

以苯乙烯(St)、丙烯酸(AA)、甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为共聚单体,制备了无皂苯丙乳液;然后以AA含量、中和度、引发剂含量和软/硬单体配比等为试验因素,以乳液稳定性和粒径为考核指标,采用单因素试验法优选出制备无皂苯丙乳液的最佳工艺条件。结果表明:当w(引发剂)=1.2%和w(AA)=4.5%(均相对于单体总质量而言)、中和度为0.8、m(BA)∶m(St+MMA)=4∶6和反应温度为78℃时,可制得粒径为纳米级的高固含量稳定乳液。

Study on preparation of soap-free styrene-acrylate emulsion by water-soluble monomer copolymerization

With styrene(St),acrylic acid(AA),methyl methacrylate(MMA) and butyl acrylate(BA) as comonomers,a soap-free St-acrylate emulsion was prepared.Then,with AA contents,neutralisation degree,initiator contents and soft monomer/hard monomer ratios as experimental factors,emulsion stability and particle size as evaluation indices,the optimal process conditions of preparing soap-free St-acrylate emulsion were preferred by single-factor experiment.The results showed that the stable emulsion with nano-level size and high solid content was prepared when mass fractions of initiator and AA were 1.2% and 4.5% in total monomers respectively,neutralisation degree was 0.8,mass ratio of m(BA)∶m(St+MMA) was 4∶6 and reaction temperature was 78 ℃.