高温拉伸制备交联聚乙烯微孔膜的探索研究  

Exploratory study on preparation of crosslinked polyethylene microporous membrane by high temperature stretching

作　　者：任冬雪 孙小杰 REN Dongxue;SUN Xiaojie(National Institute of Clean-and-Low-Carbon Energy,Beijing 102209,China)

机构地区：[1]北京低碳清洁能源研究院,北京102209

出　　处：《膜科学与技术》2021年第1期50-56,共7页Membrane Science and Technology

摘　　要：采用热拉伸-高温退火-冷拉的拉伸工艺制备了交联聚乙烯微孔膜,考察了交联聚乙烯的交联度、拉伸温度、退火温度和冷拉等工艺条件对交联聚乙烯微孔膜成孔性能的影响,并对成孔过程和机理进行了探讨.交联聚乙烯的交联度显著影响成孔性能,随着交联度的增加,成孔性增加.拉伸温度在90~120℃时,膜片基本由纤维状晶构成.拉伸温度升至130℃,并在此温度进行高温退火处理,膜片开始出现细缝状微孔.施加冷拉可以调控细缝状微孔形态演变,进一步被拉伸成圆形或椭圆洞状微孔.本文所用拉伸工艺为制备高性能聚乙烯微孔膜提供了一种新的思路,有助于开发自主知识产权的聚乙烯微孔膜技术,突破锂离子电池隔膜等高端聚乙烯微孔膜的国外技术垄断.Cross-linked polyethylene microporous membranes were prepared by a new stretching process including hot stretching,high temperature annealing and cold drawing.The process conditions such as cross-linking degree,stretching temperature,annealing temperature and cold drawing of cross-linked polyethylene were investigated.The effect of the pore-forming performance of polyethylene microporous membrane,the pore-forming process and mechanism were discussed.The degree of cross-linking of crosslinked polyethylene significantly affects the pore-forming performance.As the degree of cross-linking increases,the porosity increases.When the stretching temperature is between 90℃and 120℃,the membrane is basically composed of fibrous crystals.The stretching temperature was raised to 130℃and hightemperature annealing treatment was performed at this temperature,the film began to appear fine slit-shaped micropores.The application of cold-drawing can regulate the morphological evolution of the slit-shaped micropores,which are further stretched into circular or elliptical micropores.The new stretching process provides a new idea for the preparation of high-performance polyethylene microporous membranes.

关 键 词：聚乙烯 微孔膜 交联 

分 类 号：TQ316.6[化学工程—高聚物工业]