逆凝聚包覆法制备硫黄调节型粉末氯丁橡胶 Ⅰ.粒径分布

采用逆凝聚包覆法制备硫黄调节型粉末氯丁橡胶(PCR)并考察加料方式、搅拌转速和胶乳加人流速对产物粒径分布的影响。建立氯丁胶乳的逆凝聚粉末化模型并采用均匀试验设计的方法对该模型进行了验证。验证结果表明，该模型可以有效地模拟PCR的逆凝聚包覆氯丁胶乳的粉末化过程。PCR产物中粒径1～3mm的中等粒子的质量分数仅与搅拌转速有关，表明湍流爆裂是产生中等粒子的主要原因，而带状拉伸则是产生较粗颗粒和细小粒子的主要原因。扫描电子显微镜观察发现，采用逆凝聚包覆法制备的PCR粒子为单颗连续粒子，即产物粒子由单颗胶乳液滴凝聚而成。

Preparation of sulfur-modified powdered CR by reverse-coagulation cover method:Ⅰ.Particle size distribution

A sulfur-modified powdered CR (PCR-121) was prepared by reverse-coagulation cover method and the effect of the latex adding procedure and speed,and the stirring speed on the particle size distribution of product was investigated.A reverse-coagulation powder model of CR latex was established.The model was verified by uniform experimental design method.The results showed that the model could be used to simulate the reverse coagulation powdering process of CR latex effectively;the mass fraction of medium particle (1 to 3 mm) was only related to the stirring speed,i.e. the medium particles were generated mainly by the turbulent decrepitation of latex drop and the large and small particles were generated mainly by the ribbon tension.It was found by SEM that the PCR-121 particles were continuous single particles,which were coagulated from the single CR latex drops.