三层共挤聚乙烯流延膜的热封强度与组成关系  

Effect of compositions on seal strength of three-layer co-extruded PE cast ?lms

作　　者：姚雪容[1] 孟鸿诚[2] 任敏巧[1] 任毅[1] 唐毓婧[1] 李娟[1] 郑萃 张韬毅[1] Yao Xuerong;Meng Hongcheng;Ren Minqiao;Ren Yi;Tang Yujing;Li Juan;Zheng Cui;Zhang Taoyi(SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013,China;SINOPEC Zhenhai Refining & Chemical Company,Ningbo 315207,China)

机构地区：[1]中国石油化工股份有限公司北京化工研究院,北京市100013 [2]中国石油化工股份有限公司镇海炼化分公司,浙江省宁波市315207

出　　处：《合成树脂及塑料》2019年第1期6-11,共6页China Synthetic Resin and Plastics

摘　　要：通过差示扫描量热法(DSC)和升温淋洗分级研究了3种三层共挤聚乙烯流延膜的热封强度与组成的关系。结果表明:不同热封层组成的薄膜起封温度主要与热封层的非晶比例有关,可用热封层树脂的DSC熔融行为来推测薄膜起封温度大致范围;当热封温度高时,薄膜在热封后的冷却结晶过程中形成高的结晶度和晶体熔点,有利于形成高的热封强度;热封层相同但芯层不同的薄膜其高温热封性能也有差异,说明在高温时芯层也部分参与到热封层的形成;3种薄膜在高温时的热封强度大,足以抗衡薄膜的拉伸屈服和一定程度的应变硬化。The effect of compositions on the seal strengths of three different three-layer co-extruded polyethylene(PE)cast films were observed by differential scanning calorimeter(DSC)and temperature rising elution fractionation(TREF).The results indicate that the initial sealing temperature depends on the ratio of the non-crystalline phase in the sealing layer,which can be estimated from the melt behaviors of the sealing layer resins by DSC.The crystallinity and crystal melting point of the films are high at a high sealing temperature during cooling and crystallization process after heat sealing,which is in favor of higher seal strength.The films with same sealing layer and different compositions in the middle layer show different sealing properties,indicating the involvement of the middle layer resins in the sealing processes.The heat sealing strengths of the three-layer films at high sealing temperature are strong enough to resist the yielding and strain hardening to some extent.

关 键 词：聚乙烯流延薄膜 三层共挤 热封强度 组成 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ322.2