摘要
以不同均化方式得到微悬浮分散液,再经微悬浮聚合制备了PVC糊树脂。首先以三氯乙烯为氯乙烯单体的模拟液,研究了十二烷基硫酸钠乳化剂/十六、十八混合醇助稳定剂复合胶束和单体亚微液滴的形成过程,发现复合胶束的形成过程和三氯乙烯溶胀进入复合胶束形成亚微液滴的过程均受扩散动力学控制,延长溶胀时间及施加高速剪切分散可以强化溶胀过程,复合胶束对单体具有"超级溶胀"能力。然后采用搅拌溶胀和高速剪切微悬浮聚合得到PVC乳胶粒子,发现两者形貌相同,而前者粒径略大、分布略宽;延长搅拌溶胀时间,可使粒度分布更接近高速剪切均化微悬浮聚合得到的PVC乳胶粒子的粒度分布。
Poly（vinyl chloride） paste resin was prepared by micro-suspension polymerization of dis- persion formed by different homogenization ways. First, the formation of sodium dodecyl sulfate/cetyl alcohol and stearyl alcohol complex micelle and the formation of monomer submicro-droplets were studied through using trichloroethylene as the model of vinyl chloride. It was found that the formation of com- plex micelle and the formation of submicro-droplets via swelled trichloroethylene into the complex micelle were both diffusion-controlled process, the swelling process was intensified as swelling time increased or as high speed shear dispersion was applied, and the complex micelle exhibited super capacity to swell mono- mer. Then PVC latex particles were prepared by agitation and by high-speed shearing homogenization. It was found that PVC latex particles prepared by the above two methods exhibited similar morphology, while the average size of the PVC latex particles prepared by the first method was larger and the size distri- bution was wider. By prolonging swelling time, the size distribution of PVC latex particles could ap- proach that of PVC latex particles prepared by high-speed shearing homogenization.
出处
《聚氯乙烯》
CAS
2016年第11期7-12,共6页
Polyvinyl Chloride
关键词
氯乙烯
微悬浮聚合
成粒
溶胀
粒度分布
vinyl chloride
micro-suspension polymerization
particle formation
swelling
size distribution
