硬脂酸钙与硬脂酸锌对双峰HDPE MFR测试值的影响  

Effect of CaSt and ZnSt on melt flow rate measurement of bimodal HDPE

作　　者：张强[1] Zhang Qiang(PetroChina Sichuan Petrochemical Company,Chengdu 611930,China)

机构地区：[1]中国石油四川石化有限责任公司分析测试中心,四川成都611930

出　　处：《合成树脂及塑料》2022年第6期26-29,共4页China Synthetic Resin and Plastics

摘　　要：生产双峰高密度聚乙烯(HDPE)时,熔体流动速率(MFR)随测试次数的增加而增大,为此研究了硬脂酸钙(CaSt)与硬脂酸锌(ZnSt)对双峰HDPE MFR测试值的影响规律。结果表明:CaSt极性强于ZnSt,CaSt与ZnSt同时作用于HDPE时,会在口模内表面形成促进流动的微观润滑膜并且会逐渐积累,肉眼无法观察到这种微观润滑膜,常规操作也不能清理掉微观润滑膜;使用未加润滑剂的纯HDPE“冲洗”一次口模,可清理掉微观润滑膜,消除CaSt和ZnSt的影响。The melt flow rate(MFR)of bimodal high density polyethylene(HDPE)increases with the increase of test times.Therefore,the influence of calcium stearate(CaSt)and zinc stearate(ZnSt)on MFR test value of bimodal HDPE was studied.The results show that the polarity of CaSt is stronger than that of ZnSt.When CaSt and ZnSt act on HDPE at the same time,a micro lubricating film promoting flow is formed on the inner surface of the die and will gradually accumulate.This micro film cannot be observed by naked eyes,and cannot be removed by conventional operation.Pure HDPE without lubricant can be used to“wash”the die once to remove the micro lubricating film and eliminate the influence of CaSt and ZnSt.

关 键 词：高密度聚乙烯 熔体流动速率 硬脂酸钙 硬脂酸锌 润滑膜 聚乙烯蜡 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]