双螺杆挤出机在高比例溶剂POE脱挥及挤压造粒中的应用

Application of twin-screw extruder for high-proportion solvent POE devolatilization and granulation

对双螺杆挤出机在聚烯烃弹性体(POE)制备过程中高比例溶剂脱挥及挤压造粒应用进行了介绍,并经过试验平台验证,探索出“可控分布脱挥技术”,通过脱挥过程中各个区段不同的工艺要求,设置不同的工艺温度和螺杆的组合排列,同时通过合理控制各个区段不同的真空要求;最终利用双螺杆挤出机将POE流体中的高比例溶剂(质量分数为75%的溶剂)脱挥至50~200 ppm;同时,阐述了在脱挥过程中的技术关键点,这对大型双螺杆脱挥机组的设计起到了良好的技术支撑作用。

This paper introduced the application of twin-screw extruder for the high-proportion solvent polyolefin elastomer(POE)devolatilization and granulation. Using an experiment plate,the“controlled stepwise devolatilization process”was investigated through setting a suitable temperature and configuration of twin screw under the different process requirement of different section and controlling different vacuum of every devolatilization section. A high proportion of solvent(75 wt%)in the POE fluid was devolatilized up to 50~200 ppm through the twin-screw extruder. Meanwhile,a key technical point in devolatilization process was described,which provided a design support in the mega-extrusion and devolatilization unit.