管式法挤出涂层专用LDPE的性能及质量改进  

Improvement of Properties and Quality of Special LDPE for Extrusion Coating by Tubular Process

作　　者：彭绍洪[1] 宋国胜[2] 尹丽华 

机构地区：[1]茂名学院化学与生命科学学院,广东茂名525000 [2]华南理工大学分析测试中心,广东广州510640 [3]中国石油化工股份有限公司茂名分公司化工分部,广东茂名525021

出　　处：《塑料科技》2009年第9期43-46,共4页Plastics Science and Technology

摘　　要：针对管式工艺生产的挤出涂层专用低密度聚乙烯(LDPE)产品存在涂层与基材的黏结强度低、淋膜缩幅大等问题,通过与同类釜式产品的性能和结构的对比研究发现,管式产品的分子支化程度过低是造成其性能不佳的主要原因。分析了影响产品长链支化程度的工艺因素,并提出了增加产品长支链含量的方法。初步试生产表明:适当提高反应温度、降低反应压力并改变分子量调节剂的注入速度,可以有效地改善挤出涂层产品的性能。Aiming at the problems of low density polyethylene （LDPE） resin produced by tubular process with low adhesive strength between coating film and substrate,and serious neck-in during extrusion coating,the properties and structure of the tubular LDPE and kettle-type LDPE for extrusion coating were studied and compared,it was found that the lower long chain branch degree is the main reason causing poor performances of tubular LDPE. The influencing factors on branch extent of long chain of LDPE resin were analyzed,and the method to increase the content of long branched chain is pointed out A preliminary experiment was carried, and the results showed that the properties of product for extrusion coating can be improved by elevating reaction temperature, reducing reaction pressure and adjusting injection rate of molecular weight regulator.

关 键 词：涂层 低密度聚乙烯 缩幅 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]