水性含氟丙烯酸树脂的合成大学论文.docVIP

水性含氟丙烯酸树脂的合成 PAGE   PAGE 14 水性含氟丙烯酸树脂的合成 摘要 水性丙烯酸涂料的研制和应用始于20世纪50年代，70年代初得到了迅速发展。与传统的溶剂型涂料相比，水性涂料具有价格低、使用安全、节省资源和能源、减少环境污染和公害等优点，已成为当前丙烯酸涂料的主要发展方向。针对普通丙烯酸乳液耐沾污性不足的缺陷，我们采用种子乳液聚合技术合成了内软外硬型丙烯酸核壳复合乳液和含氟的丙烯酸核壳复合乳液。 研究了核壳乳液聚合法，制备水性含氟丙烯酸乳液的配方设计，利用单因素实验法得到官能单体用量不能超过6%，否则乳液不能正常聚合，会产生破乳现象；乳化剂在核壳内的配比低于1/2时，乳液性能不稳定；MMA/BA的配比为1：1左右时性能较优；氟碳乳液含量在10—20%耐污性好。通过正交试验法得到各因素对乳液转化率的影响程度关系为：官能单体用量乳化剂在核壳内的配比MMA/BA的配比，其优化配方为：AA的量为2%，乳化剂在核壳内的配比为3：2，MMA/BA的配比为2：3。 关键词：含氟丙烯酸乳液 核壳乳液聚合法 配方 耐污性  FLUORINE-CONTAINING ACRYLIC WATER-BASED ABSTRACT Water-based acrylic paint was researched and applied at the beginning of 1950s, it has been developing rapidly at early 1970s . And compared to traditional solvent-based coatings, waterborne coatings have many advantages of low price, safety, saving resources and energy, reducing environmental pollution and hazards, so it has become the main developing direction of the acrylic paint. Against ordinary acrylic latex is lack of stain resistance, we have adopted the technology of the seed emulsion polymerization to synthesis the outside and inside soft-hard core-shell composite latex and acrylic acrylic core-shell fluorine-containing compound emulsion. By studying the method of the core-shell emulsion polymerization and preparing the formulation of fluorine-containing acrylic water-based emulsion, though the use of single-factor experiment that we find the amount of functional monomer can not exceed 6%, or emulsion polymerization can not be normal, it would have produced the phenomenon of emulsion-breaking; emulsifiers in the nuclear shell ratio less than 1 / 2 that the emulsion is instable; MMA / BA ratio during1:1 maybe better performance; fluorocarbon emulsion content in the 10-20% tolerance is good. By obtaining orthogonal conversion of various factors on the degree of influence emulsion relationship is: the amount of functional monomer greater to emulsifier within the core-shell ratio great