四段式单螺杆反应挤出机的研制  

AN INVESTIGATION ON THE REACTION SINGLE SCREW EXTRUDER WITH 4-STAGES STRUCTURE

作　　者：吴大呜 丁玉梅[1] 龙文保[1] 王伟明[1] 刘颖[1] 陈自卫[1] 

机构地区：[1]北京化工大学,北京100029

出　　处：《高分子材料科学与工程》2000年第3期145-147,共3页Polymer Materials Science & Engineering

摘　　要：反应挤出机除了塑化功能外 ,在设计上应充分考虑反应挤出工艺的要求。虽然不同反应体系的反应类型和工艺要求有很大的差别 ,但它们对挤出机反应功能的要求 ,主要包括能量传递、物料停留时间及其分布。在对乙烯基硅烷 -聚乙烯体系熔融接枝反应动力学深入研究的基础上 ,我们对三段式单螺杆挤出机进行了改进 ,增设了反应段 ,首次提出了适于聚乙烯硅烷接枝反应过程的四段式单螺杆反应挤出机的设计原理和方法。所设计的四段式单螺杆反应挤出机成功地用于硅烷交联聚乙烯管的生产过程 ,经生产运行考核 ,证明四段式反应挤出机的接枝反应效率明显提高。文中还提出了挤出机中熔体停留时间的简化计算方法 ,可以为确定反应工艺条件、控制反应时间提供参考数据。Besides plasticizing capacity, the reaction function should be taken into account when a reaction extruder is being designed. The main demands on reaction extruder refer to the delivering of energy, the residence time and distribution of residence time of the polymer through the extruder. Based on the dynamic analysis of the silane grafting reaction, a 4 stage single screw reaction extruder was proposed. The especially designed reaction stage follows the homogenizing stage. The purpose of introducing the reaction stage is explained to increase residence time of the polymer and decrease excessive shearing of the grafted polymer. Experiments indicate that by introducing reaction stage the grafting efficiency of the extruder is enhanced evidently. In this paper the design principle of the 4 stage single screw reaction extruder was discussed. In addition, a simplified formulation for estimating the residence time of the melt polymer was proposed.

关 键 词：反应挤出 四段式 螺杆挤出机 塑料 挤出成型 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]