高流动性聚丙烯的熔融剪切流动行为  

Melt shear flow behavior of high flowability polypropylene

作　　者：陈智能[1] 黄峰[1] 李延亮[1] 贾秀丽[1] 

机构地区：[1]中国石油化工股份有限公司齐鲁分公司研究院,山东省淄博市255400

出　　处：《合成树脂及塑料》2013年第6期28-30,共3页China Synthetic Resin and Plastics

摘　　要：利用熔体流动速率仪、毛细管流变仪研究了氢调法聚丙烯(简称A)、可控流变法聚丙烯(简称B)及其经过双螺杆挤出机挤出的一次产物(分别记作A-1,B-1)在熔融剪切流动过程中的熔体流动行为。结果表明:A,A-1,B,B-1均为假塑性流体,随剪切速率增大,温度敏感性下降,当剪切速率高于1 000 s-1后剪切黏度趋于稳定;与A相比,A-1的剪切敏感性高、熔体流动速率基本不变;而B-1的剪切敏感性、熔体流动速率均比B低,且当温度高于230℃时,B的熔体流动速率大幅增加。The melt flow behaviors during melt shear flow process of polypropylene produced by hydrogen-regulating method and controllable rheological method （called A and B respectively）, and their first extrusion products extruded through twin-screw extruder（called A-1 and B-1 respectively） were studied by melt flow rate indicator and capillary rheometer. The results showed that A, A-1, B and B-1 were all pseudoplastic fluid. The temperature sensitivity decreased with the increase of shear rate. When the shear rate was over 1 000 s-1, the shear viscosity tended to be stable. The shear sensitivity of A-1 was higher than that of A and their melt flow rates were similar. But both the shear sensitivity and the melt flow rate of B-1 were lower than those of B. And the melt flow rate of B increased significantly when the temperature exceeded 230 ℃.

关 键 词：聚丙烯 高流动性 氢调法 可控流变法 剪切流动 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]