微量PPA对m-LLDPE高速挤出流变性能的影响  

Effect of Trace PPA on Rheology Property of m-LLDPE at High Speed Extrusion

作　　者：刘祥贵[1] 赵贝[1] 孙显茹[1] 吴其晔[1] 

机构地区：[1]青岛科技大学教育部橡塑工程重点试验室,山东青岛266042

出　　处：《现代塑料加工应用》2010年第5期4-7,共4页Modern Plastics Processing and Applications

基　　金：国家自然科学基金资助项目(50573037;50973050)

摘　　要：采用恒速型双毛细管流变仪研究了含氟弹性体(PPA)对茂金属催化线性低密度聚乙烯(m-LLDPE)熔体高速挤出不稳定行为的影响。结果表明,微量PPA的加入能推迟甚至抑制鲨鱼皮畸变,能明显改善粘-滑畸变。加入微量PPA后,挤出压力下降,管壁上应力集中效应减弱,挤出压力振荡现象减弱甚至消失,流动曲线由断裂逐渐变得连续。The effect of PPA on the rheology of metalloeene linear low density polyethylene （m-LLDPE） at high speed extrusion was studied through a double-capillary rheometer working under constant speed. The results show that trace PPA can delay, even inhibit the occurrences of sharkskin, and improve the stick-slip distortion. When trace PPA is added into m-LLDPE, expression pressure decreases, effect of stress concentration on the wall decreases, extrusion pressure oscillation weakens and even disappeares, the fracture flow curves beeome continuous gradually.

关 键 词：含氟弹性体 茂金属催化线性低密度聚乙烯 高速挤出 不稳定流动现象 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]