目的 研究支化单体对丙烯酸酯乳液的影响。 方法 以顺丁烯二酸酐和季戊四醇为原料，通过酯化反应制备聚酯型四臂支化单体，将其水分散液与甲基丙烯酸甲酯等单体进行乳液聚合，得到支化丙烯酸酯乳液。测定不同比例分散液对乳液基本性能的影响。 结果 制备乳液粒径分布 100~200 nm，表面张力稳定在 30~35 mN/m，增加分散液的比例可适当降低乳液粘度，降低吸水率。 结论 将支化聚合物引入乳液聚合体系，可有效降低乳液粘度和吸水率。

This work aimed to study the effects of branched monomer on the polyacrylate emulsion. A branched polymer (HBP4) was synthesized by esterification using maleic anhydride and pentaerythrite. And then it was neutralized with ammonia water. And the emulsion was synthesized by emulsion polymerization using methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA) and the branched polymer aqueous dispersions as comonomer. The particle size distribution of the branched polyacrylate emulsion was in the range of 100-200nm, surface tension stabilized at 30~35 mN/m, and it had film-forming property and the emulsion had good stability. This branched polyacrylate emulsion had low viscosity and high stability. Adding branched polymer as monomer to the polyacrylate emulsion could decrease the viscosity of emulsion and the water absorption of latex film.