分子结构对双峰管材专用树脂流变性能的影响  

Influence of Molecular Structure on Rheological Properties of Bimodal Pipe Special Resins

作　　者：李朋朋[1] 李国新[2] 马国平 伍剑[1] Li Pengpeng;Li Guoxin;Ma Guoping;Wu Jian(Lanzhou Petrochemical Research Center,PetroChina,Lanzhou,Gansu,730060;Petrochemical Plant of Lanzhou Petrochemical Company,PetroChina,Lanzhou,Gansu,730060;Southwest Chemicals Marketing Company,PetroChina,Chongqing,401333)

机构地区：[1]中国石油天然气股份有限公司兰州化工研究中心,甘肃兰州730060 [2]中国石油天然气股份有限公司兰州石化公司石油化工厂,甘肃兰州730060 [3]中国石油天然气股份有限公司西南化工销售重庆分公司,重庆401333

出　　处：《现代塑料加工应用》2019年第4期39-42,共4页Modern Plastics Processing and Applications

摘　　要：对3种双峰聚乙烯管材专用树脂进行了结构性能及毛细管流变行为、拉伸流变行为的研究。结果表明:双峰管材专用树脂熔体流动速率低(0.23~0.25 g/10 min),结晶性能好(熔点128℃以上,结晶温度115℃以上,结晶度大于65%),相对分子质量分布宽。不同管材专用树脂的结构差异决定了其流变加工性能。少量低相对分子质量尾端组分对挤出流变行为的影响显著,可以降低低剪切速率下的黏度和压力。提高高相对分子质量组分所占比例,比增大高相对分子质量组分的相对分子质量大小对提高熔体强度的效果更明显。The structural properties,capillary rheological behavior and extensional rheological behavior of three kinds of bimodal pipe resins were studied.The results show that the bimodal pipe resins have low melt flow rate(0.23~0.25 g/10 min),good crystallization performance(melting point above 128℃,crystallization temperature above 115℃,crystallinity above 65%),broad molecular weight distribution.The structural differences of different pipe resins determine their rheological properties.A small number of low molecular weight tail components have a significant effect on extrusion rheological behavior and can reduce viscosity and pressure at low shear rates.It is more effective to increase the proportion than to increase the molecular weight of high molecular weight components to increase the melt strength.

关 键 词：双峰聚乙烯 结构与性能 毛细管流变 拉伸流变 

分 类 号：TQ3[化学工程]