含氟丙烯酸酯核壳乳液的合成与性能

Synthesis and Property of Fluorine-Containing Polyacrylate Latex with Core-Shell Structure

采用三阶段种子半连续乳液聚合,制得了以BA(丙烯酸丁酯)-MMA(甲基丙烯酸甲酯)共聚物为核,BA-MMA-TFEA(甲基丙烯酸三氟乙酯)共聚物为壳的核壳型含氟丙烯酸酯乳液。对乳液聚合过程中单体转化率的变化,特别是乳胶粒子的增长及分布的演变进行了测试和分析,证实了乳胶粒子核壳结构的形成。乳液聚合物膜的性能测试结果表明,与相同含氟单体用量的常规乳液相比,含氟聚合物富集于壳层的核壳形态有利于含氟结构单元在聚合物膜表面的分布,使用少量的含氟单体即可显著降低聚合物膜的表面能,提高其耐水性。

The core-shell fluorine-containing polyacrylate latex with poly （butyl acrylate-co- methyl methacrylate） core and poly （butyl acrylate-co-methyl methacrylate-co-trifluoroethyl methacrylate） shell was prepared by three-stage semicontinuous emulsion polymerization. The good defined core-shell morphology of the latex particles were confirmed by the measurement and analysis of the growth process of particles, the evolution of particle size distribution, as well as the variation of the monomer conversion. The surface property and hydroscopycity of the latex films were investigated and the results show that, compared with the film of normal latex and the same content of fluorinated monomer （TFEA）, the film of core -shell latex with fluorinated copolymer in the shell is of advantage to obtain most of the fluorinated groups at the surface of the final film, which then has a low surface energy and better water-resistance.