涂料用核壳型纯丙乳液的合成研究

Research on Synthesis of Core-Shell Acrylic Emulsion for Coatings

采用甲基丙烯酸甲酯和丙烯酸正丁酯为核层单体,丙烯酸异辛酯、丙烯酸和甲基丙烯酸正丁酯为壳层单体,合成具有核壳结构的纯丙乳液。通过对丙烯酸羟丙酯对乳液成膜性能影响的讨论,得出丙烯酸羟丙酯用量不能超过聚合单体总量的1.5%。讨论了核层玻璃化转变温度,以及核层/壳层的质量比对乳液力学性能的影响。核层玻璃化转变温度为45℃,核层/壳层的质量比为40∶60时,所得核壳乳液的力学性能最为理想,符合涂料的使用要求。

A core-shell acrylic emulsion was synthesized, with methyl methacrylate and butyl acrylate as core monomer, and ethylhexyl acrylate, acrylic acid and butyl methacrylate as shell monomer. The influence of hydroxypropyl acrylate on emulsion properties showed that fihn would have a good application when the mass fraction of hydroxypropyl acrylate was less than 1.5%. The influence of core＇ s glass transition temperature and the weight ratio of core/shell layer on mechanical properties were discussed. The results showed that emulsion had the excellent mechanical properties when the core＇ s glass transition temperature was 45 ℃ and the mass ratio of core/shell layer was 40 ： 60. The emulsion achieves the application requirements of coatings.