第42卷第3期
2014年3月【材料与性能】
聚氟乙烯 Polyvinyl Chloride
新型PVC片材的力学性能和阻隔性能的研究
李长金·，周星"，史聪"，程肖飞”，杨卫民”（1.北京化工大学机电工程学院，北京100029；
2.江苏金材科技股份有限公司技术中心，江苏扬州225111）
【关键调词】PVC;PVA；片材；力学性能；阻隔性能
Vol.42,No.3 Mar.，2014
【摘要】采用微层挤出技术制备了微层PVC片材，采用涂覆法制备了多层PVC/PVA复合片材，对其力学性能和阻隔性能进行了研究。结果表明：①多层结构有利于提高PVC/PVA复合片材的阻隔性能，涂覆PVA落液增大了片材的拉伸强度。②微层PVC片材的分子链发生取向，沿挤出方向的拉伸强度明显高于垂直挤出方向；微层 PVC片材的层数越多，取向作用越强，越有利于阻隔性能的提高。
【中图分类号】TQ325.3
【文献标志码】B
【文章编号】10097937(2014)03001604
Study on mechanical properties and barrier properties of new PVC sheets
LI Changjin',ZHOU Xing', SHI Cong', CHENG Xiaofei, YANG Weimin
(1. College of Mechanical and Electrical Eengineering,
Bejing University of Chemical Technology, Bejing 100029, China;
2. Technical Center of jiangsu Jincai Science and Technology Co., Ltd., Yangzhou 225111, China) Key words:PVC; PVA; sheet; mechanical property; barrier property
Abstract: Micro-layer PVC sheets were prepared by micro-layer extrusion technology, and PVC/ PVA composite sheets were prepared by coating method. Their mechanical properties and barrier proper-ties were studied. The results showed that: multilayer structure was beneficial to improving the barrier properties of PVC/PVA composite sheet, and the tensile strength of the sheets increased due to coating PVA. ② The molecular chains of micro-layer PVC sheets were oriented, so the tensile strength along the extrusion direction was significantly higher than that along the direction perpendicular to extrusion direc-tion. The more layers of micro-layer PVC sheets had, the stronger the orientation effect was, the more beneficial to improving barrier properties was.
Foundation item: National Natural Science Foundation of China(21174015)
药品较常用的包装方式是用PVC复合材料制备的硬片泡罩包装。虽然PVC材料容易成型和密封，且价格低廉，但其热稳定性差，对水蒸气和氧气的阻隔性能不高，单纯使用PVC材料制得的药品包装的阻隔性能远远达不到包装行业的国家标准。为提高PVC材料的阻隔性能，通常采用在PVC片材上多次涂覆PVDC溶液的方法。但PVDC的价格
【收稿日期】2013-12-10
【基金项目】国家自然科学基金项目（21174015）
较高，大大提高了产品成本，所以PVC/PVDC材料一般只用于价格较高且对氧气敏感和容易吸潮的药品的包装，同时由于PVDC含有氧而一直存在安全隐患(1-]。因而，寻找PVC片材新的制备方法或用其他阻隔性能优异的材料取代PVDC是解决该间题的2种途径。针对前一种途径，笔者利用微层挤出技术制备了新型微层PVC片材来提高其阻隔性
【作者简介】李长金（1985一），男，博士研究生，主要从事高分子材料成型加工等方面的研究。
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