稀土系聚异戊二烯胶乳乳化配方的优化

Optimization of Emulsifier Formula for Polyisoprene Latex Catalyzed by Rare Earth

为了制备稳定的稀土系聚异戊二烯胶乳,研究了不同乳化剂和配比对胶乳稳定性的影响。首先将聚异戊二烯橡胶溶在有机溶剂中,然后加入乳化剂使其乳化,最后蒸馏除去溶剂后制得稀胶乳。结果表明:主乳化剂采用歧化松香酸钾与十二烷基苯磺酸钠复合乳化剂复配且质量比为2∶1,当加入助乳化剂Span 80且用量为水相质量分数的0.2%时胶乳稳定存在且粒径小,为216.2 nm,固形物质量分数可达0.105,胶乳稳定性能和表观形貌好。

In order to prepare stable polyisoprene latex catalyzed by rare earth,the effects of different emulsifiers and their proportions on the stability of latex were studied. Polyisoprene rubber was firstly dissolved in organic solvent,then emulsifier was added to emulsify polyisoprene rubber,and the dilute latex was obtained after distillation of the solvent. The results showed that,when the main emulsifiers were disproportionated potassium rosinate and SDBS and their ratio was 2∶1,and the co-emulsifier was Span 80 and its weight was 0. 2% of water phase weight,the latex was stable,in which the particle size of latex was 216. 2 nm and the solid content was 0. 105. The latex possessed good stability and apparent morphology.