摘要
研究了丙烯酸甲酯水包油型微乳液聚合中 ,引发剂的种类、用量。反应温度、反应时间、乳化剂的不同、乳化剂含量对聚合反应的影响 ,用偶氮二异丁腈比用过硫酸钾 ,单体转化率高 ,引发剂一次加入与分次加入 ,单体转化率变化不大 ,引发剂的最佳用量应为单体含量的 1%～ 2 %之间 ;最佳反应温度在 6 0℃左右 ;反应时间为 6h ;用反应性乳化剂十一烯酸钠代替十二烷基硫酸钠 ,同时与十六烷基三甲基溴化铵 (CTAB)作比较 ,发现用反应性乳化剂十一烯酸钠 ,不论是单体转化率还是聚合产物的稳定性都比其它两者强。用电子透镜观察聚合得到的聚丙烯酸甲酯微乳液乳胶粒 ,发现用反应性乳化剂十一烯酸钠反应得到的聚合物的颗粒 ,平均粒径在 30nm ,分布呈双峰。测得最低成膜温度为 10 8℃。
In this paper,the kind and dosage of the initiator of polymerization of methacrylate in ternary oil-in-water microemulsions were studied.The four other factors that influenced the conversion-temperature,reaction time,emulsifier and its dosage were also studied.The general emulsifier(SDS) was replaced by the reactive emulsifier(sodium undecylenate) and the monomer pericent conversion was improved. And it almost didn't whether the initiator was added directly or in atches.Among some definite scope,the monomer conversion will improve with the rising of temperature、initiator content and the downing of the emulsifier content.The optimal conditions were obtained as follows:the dosage ratio of initiator and monomer was 1%～2%;reaction temperature was 60℃;reaction time was 6h and sodium undecylenate was used as emulsifier.When the reative emulsifier was employed instead of sodium lauryl sulface or CTAB, the monomer percent conversion and the stability of product was higher.The emulsoid particles obtained by the polymerization of reactive emulsifier were observed by TEM.The microlatex indicated the mean particles diameter was 30 nm.The MFT is 10.8℃.
出处
《化工时刊》
CAS
2004年第7期28-30,33,共4页
Chemical Industry Times
