农膜用聚乙烯树脂分子结构与耐老化性能的关系  

Relation Between the Molecular Structure of Polyethylene for Agricultural Film and Its Anti-aging Property

作　　者：崔海龙[1,2] 秦立洁 焦红文 陈虎生[2] 徐文国[1] 

机构地区：[1]北京理工大学理学院,北京100081 [2]北京华盾雪花塑料集团有限责任公司,北京100070

出　　处：《中国塑料》2007年第4期58-63,共6页China Plastics

摘　　要：通过对低密度聚乙烯（PE_LD）、线形低密度聚乙烯（PE-LLD）、茂金属线形低密度聚乙烯（m-PE—LLD）、乙烯-乙酸乙烯酯共聚物（EVA）等原料直接吹塑农用棚膜进行农田扣棚试验和力学性能测试，分析了各种树脂对生产PE功能性农用棚膜的适用性，并尝试从各种树脂基础分子结构角度对农膜的耐老化性能进行解释。试验结果表明：m—PE-LLD附脂的力学性能明显优于PE-LD和EVA树脂，EVA树脂在透明性方面占有优势；在耐老化性能方面，m-PE-LLD和EVA树脂无论扣棚时间还是测试数据均比PE-LD要好，从连续取样测试数据看出PE-LD断裂伸长保留率下降趋势明显，而m-PE-LLD和EVA树脂则是拉伸强度保留率下降趋势明显。PE-LD, m-PE-LLD, and EVA were compared as agricultural film in their weathering resistance. The mechanical properties of m-PE-LLD were better than PE-LD and EVA, however, the haze of EVA was lower than PE-LD and m-PE-LLD. The aging behavior was tested with tensile property reservation. The agricultural films made of m-PE-LLD and EVA exhibited a higher reservation in elongation at break but a lower in tensile strength than that of PE-LD.

关 键 词：农膜 聚乙烯 相对分子质量 相对分子质量分布 耐老化性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]