高耐压HDPE自增强管挤出系统及试样的结构与性能  

Extrusion of High Hoop Strength HDPE Tube by Self reinforcement and the Study of the Structure and Properties of the Sample

作　　者：蒋龙[1] 申开智[1] 吉继亮[1] 

机构地区：[1]四川联合大学塑料工程系高分子材料工程国家重点实验室

出　　处：《高等学校化学学报》1998年第4期638-641,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金;国家教育委员会博士学科点基金

摘　　要：本文针对管件在输送压力流体时的特殊应力状态，提出了管材周向自增强的构想，据此设计出了自增强挤出系统．该系统利用芯棒旋转，使大分子链沿管周向取向并在适当的压力、温度条件下生成串晶结构，从而大大提高了管材的周向强度及模量．利用ＤＳＣ、ＷＡＸＤ和ＳＥＭ等检测手段对试件的凝聚态结构进行分析。This article introduced a new extrusion method to produce HDPE pipes with greatly increased hoop strength. The schematic structure and theory of this extrusion system were discussed. Appropriate melt pressure and temperature fields, in conjunction with rotating mandrel permit the production of PE pipes with high hoop strength and modulus. The morphology of reinforced products has been studied by WAXD, SEM and DSC. The reinforcement is due to the shish kebab structure, which is responsible for the improvement of thermal and mechanical properties. The influence of processing parameter such as melt pressure and speed of mandrel on the strength and modulus of hoop and axis directions has also been investigated. The hoop strength increased with increasing melt pressure and rotating speed of mandrel.

关 键 词：HDPE 管材 自增强 串晶 挤出系统 成型 挤出成型 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]