不同牌号LDPE树脂的流变与结构性能  

Rheological and structural properties of different grades of LDPE resins

作　　者：许惠芳 慕雪梅 魏福庆 邸麟婷 罗小城 张海毅 王多鹏 XU Hui-fang;MU Xue-mei;WEI Fu-qing;DI Lin-ting;LUO Xiao-cheng;ZHANG Hai-yi;WANG Duo-peng(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060,China;Lanzhou Petrochemical Company,PetroChina,Lanzhou 730060,China;SouthChina Chemicals Marketing Company,PetroChina,Guangzhou 510630,China)

机构地区：[1]中国石油石油化工研究院兰州化工研究中心,甘肃兰州730060 [2]中国石油兰州石化公司,甘肃兰州730060 [3]中国石油华南化工销售公司,广东广州510630

出　　处：《石化技术与应用》2022年第6期383-386,共4页Petrochemical Technology & Application

基　　金：中国石油炼油与化工分公司基金资助项目(项目编号:19-LH-28-01/02/05)。

摘　　要：采用旋转流变仪、毛细管流变仪、凝胶渗透色谱(GPC)仪及稳态流变下的模型拟合试验,测试分析、比较了3种牌号低密度聚乙烯(LDPE)树脂的流变性能和结构性能。结果表明:LDPE-1,LDPE-2和LDPE-3这3种LDPE树脂的动态流变曲线形状极其相似,其储能模量、损耗模量均随扫描角频率的增加而增大;其在不同剪切速率下的毛细管试验流变行为相似,但相对分子质量最小的LDPE-3树脂加工性能最好,而相对分子质量最大的LDPE-1对剪切敏感;这3种LDPE树脂的动态流变扫描、毛细管流变试验,以及在稳态流变下使用Cross拟合模型拟合试验结果所推断得出的其相对分子质量及其分布排序,与其结构性能的GPC测试结果均呈良好的相关性。The rheological and structural properties of 3 grades of low density polyethylene(LDPE)resins were tested,analyzed and compared by means of rotary rheometer,capillary rheometer,gel permeation chromatography(GPC)and steady-state rheological model fitting test.The results showed that:the dynamic rheological curves of LDPE-1,LDPE-2 and LDPE-3 were very similar,and their storage modulus and loss modulus increased with the increase of scanning angular frequency.The capillary rheological behaviors of such 3 LDPE resins under the different shear rates were similar,but the processability of LDPE-3 resin with the smallest relative molecular mass was better,while LDPE-1with the largest relative molecular mass was sensitive to shear.The dynamic rheological scanning and capillary rheological tests of such 3 LDPE resins,as well as the conclusion that the relative molecular mass ranking and the distribution width of such 3 LDPE resins were deduced by fitting the test results using the Cross model under the steady rheological state,which had good correlation with that of the GPC test results.

关 键 词：低密度聚乙烯(LDPE) 树脂 流变性能 结构性能 储能模量 损耗模量 相对分子质量 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]