可聚合琥珀酸双酯磺酸钠乳化合成聚丙烯酸酯纳米乳液

采用半连续种子乳液聚合工艺,在可聚合乳化剂十六烷基烯丙基琥珀酸双酯磺酸钠(Ⅰ)和辛基酚聚氧乙烯醚烯丙基琥珀酸双酯磺酸钠(Ⅱ)存在下,合成了聚丙烯酸酯纳米乳液,探讨了可聚合乳化剂种类及用量、聚合温度、引发剂用量、聚合时间对丙烯酸酯乳液聚合及性能的影响,通过FTIR、TEM和DSC对聚合产物进行了表征分析。结果表明,可聚合乳化剂参与了与丙烯酸酯的共聚反应,所得聚合物乳胶膜的玻璃化温度为23.5℃;与传统乳化剂十二烷基硫酸钠(SDS)相比,可聚合乳化剂可提高乳胶膜的耐水性;当m(Ⅰ)∶m(Ⅱ)=1∶2,乳化剂质量分数2%,聚合温度85℃,引发剂质量分数0.5%,聚合时间2 h时,所得乳液的固体分质量分数为32.70%,平均粒径72.3 nm,分布指数0.143,吸水率4.57%。

Systhesis of Nanometer Polyacrylate Emulsion with Polymerizable Emulsifier

Nanometer polyacrylate emulsion was systhesized by semi-continuous seeding emulsion polymerization with sodium cetyl allyl sulfosuccinic diester(Ⅰ) and sodium octyphenol polyoxyethylene ether allyl sulfosuccinic diester(Ⅱ).Polyacrylate emulsion was determined and analyzed by FTIR,TEM and DSC.The results suggested that polymerizable emulsifier Ⅰ and Ⅱ could participate in polymerization with the monomers,and the vitrification temperature of resulting latex film was 23.5 ℃.Compared with conventional emulsifier SDS,water-fast performance of the latex film could be enhanced obvious by using polymerizable emulsifiers when the mass ratio of Ⅰ and Ⅱ was 1∶2,emulsifier content was 2%,polymerization temperature was 85 ℃,initiator content was 0.5% and polymerization time was 2 h.The solid content of the emulsion was 32.70 %,the average diameter of the emulsion particles was 72.3 nm.PDI of the particle size was 0.143,and the water absorbing ratio was 4.57%.