低密度聚乙烯的毛细管流变性能

纺织学报 ›› 2013, Vol. 34 ›› Issue (6): 13-15.

低密度聚乙烯的毛细管流变性能

冯松¹焦晓宁^1，2

1. 天津工业大学纺织学院
2. 天津工业大学先进纺织复合材料教育部重点实验室

收稿日期:2012-06-14 修回日期:2012-09-21 出版日期:2013-06-15 发布日期:2013-06-19
通讯作者: 焦晓宁 E-mail:xiaoningj@tjpu.edu.cn

Rheological properties during capillary extrusion of linear low density polyethylene

FENG SONG,

Received:2012-06-14 Revised:2012-09-21 Online:2013-06-15 Published:2013-06-19

摘要/Abstract

摘要： 为研制LDPE纤维, 确定合理的纺丝工艺参数,利用德国GOETTFERT公司RHEOGRAPH25 75型毛细管流变仪研究了低密度聚乙烯(LDPE)材料的流变性能，研究表明LDPE剪切粘度随剪切速率的增大而降低，随温度的升高而降低，非牛顿指数n 小于1，随温度的升高而变大，当LDPE在加工温度为205℃进行挤出时, 非牛顿指数为0.498,最接近牛顿流体。在150~250℃ 范围内，LDPE的黏流活化能在10~13J/mol之间,且黏流活化能随剪切速率增加而降低,稠度系数K随温度升高而降低，属于假塑性流体，在纺丝过程中可以通过调节温度和剪切速率来改变LDPE熔体的可纺性。

关键词: LDPE树脂, 毛细管流变仪, 流变性能, 可纺性

Abstract: A series of studies on the rheological behavior of LDPE melt were carried on, so as to provide the optimal spinning parameters to prepare the LDPE fiber. The study used RHEOGRAPH 25 75 of by GOETTFERT company of the Germany. The influences of shear rate，shear stress and temperature on the flow properties of LDPE pipe were investigated by using capillary rheometer at different temperature． The research result is that: the melt shear flow obeyed roughly the power law; the dependence of the melt apparent shear viscosity on the temperature corresponded approximately with the Arrhenius equation; The non-Newton exponent of LDPE is 0.498 when extrusionspinning is carried out at the temperature of 205 oC , which is most close to the Newton liquid . The activation energy of LDPE is between 10 and 13 J/P mol, when spinning performed at 150~250 oC , which decreases with the increasing of the shear rate. the melt apparent shear viscosity of LDPE pipes decreased nonlinearly with the increase of shear rate and shear stress?.

Key words: LDPE resin, capillary rheometer, rheological proterty, spinnability

中图分类号:

TQ3421206

冯松焦晓宁. 低密度聚乙烯的毛细管流变性能[J]. 纺织学报, 2013, 34(6): 13-15.

FENG SONG. Rheological properties during capillary extrusion of linear low density polyethylene[J]. JOURNAL OF TEXTILE RESEARCH, 2013, 34(6): 13-15.

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