摘要
研究了等规聚丙烯(IPP)水相悬浮热氯化,考察了氯化时间和温度、IPP粒径、搅拌转速、通氯速率等条件对氯化反应的影响。发现氯含量随氯化温度的升高而增大,随IPP粒径的减小而呈线性增大;在IPP充分分散条件下搅拌和通氯速率对氯化几无影响。扫描电镜(SEM)照片显示,氯化反应首先发生在粒子表面,氯化产物将粒子表面孔隙填充,增加了氯向粒子内部扩散的阻力,致使粒子内部的氯化反应缓慢。
Isotatic polypropylene(IPP) particles were suspended in aqueous phase and then thermal-chlorinated. The effects of reaction time, temperature, polypropylene particle diameter, agitation speed, chlorine flow rate on the chlorination were studied. It was showed that the reaction time, temperature, polypropylene particle diameter were key factors influencing on the chlorination. The chlorination degree increased with the increase of reaction temperature, and decreased linearly with the increase of polypropylene particle diameter. The influences of the agitation speed and chlorine flow rate on the chlorination were not significant. According to the morphology of chlorinated PP observed by scan electron micrography (SEM), it indicated that the chlorination occurred at the surface of IPP particle at first, and chlorination rate in the internal PP decreased due to the filling of surface layer porosity by the chlorinated product and the increased diffusion resistance of chlorine toward internal particle.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2004年第1期70-74,共5页
Chemical Reaction Engineering and Technology
关键词
聚丙烯
氯化反应
温度
IPP粒径
搅拌转速
polypropylene
chlorinated polypropylene
suspended, thermal-chlorination
