基于退火处理的双向拉伸聚丙烯薄膜的结构与性能  

Structures and Properties of Biaxially Oriented Polypropylene Films after Annealing Treatments

作　　者：张博[1] 杨怡[2,3] 钱翠珠 郑闪闪[1] 蔡怀远 刘丹 俞飞 王宝 潘鹏举[2,3] ZHANG Bo;YANG Yi;QIAN Cuizhu;ZHENG Shanshan;CAI Huaiyuan;LIU Dan;YU Fei;WANG Bao;PAN Pengju(China Tobacco Zhejiang Industrial Co.,Ltd.,Hangzhou 310009,China;State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China;Yunnan Kunlene Film Industries Co.,Ltd.,Kunming 650000,China;Suzhou Kunlene Film Industries Co.,Ltd.,Suzhou 215000,China)

机构地区：[1]浙江中烟工业有限责任公司,浙江杭州310009 [2]浙江大学化学工程与生物工程学院,化学工程联合国家重点实验室,浙江杭州310027 [3]浙江大学衢州研究院,浙江衢州324000 [4]云南昆岭薄膜工业有限公司,云南昆明650000 [5]苏州昆岭薄膜工业有限公司,江苏苏州215000

出　　处：《塑料工业》2024年第11期100-105,共6页China Plastics Industry

摘　　要：双向拉伸聚丙烯薄膜(BOPP)具有优异的光学以及力学性能,在包装领域具有重要的用途。然而,在温度较高的南方天气下,BOPP薄膜容易发生收缩,产生褶皱缺陷,严重的甚至导致产品变形。BOPP薄膜的后收缩严重影响了产品的气密性、美观度、成本以及销量。针对该现象,本文结合差示扫描量热仪、广角X射线衍射系统、光泽度仪、雾度仪、摩擦仪、万能拉伸试验机、热封仪、测厚仪等多种技术表征手段研究了BOPP薄膜在40~80℃下退火过程中的结构与性能变化。研究结果表明,退火时间越长、退火温度越高,BOPP薄膜的收缩率越大,退火后的结晶度和晶体取向程度增加。BOPP薄膜的厚度、雾度、摩擦系数、光泽度、热封强度没有发生太大的变化,收缩率减小,拉伸强度变大。该研究为改善BOPP薄膜的后收缩提供了理论指导。Biaxially oriented polypropylene(BOPP)films with excellent optical and mechanical properties play an important role in the packaging field.However,in the southern weather with high temperature,BOPP films tend to shrink,resulting in fold defects and product deformations.The post-shrinkage of BOPP films strongly affects the gas emission,beauty,cost and the sales.The evolutions of structures and properties of BOPP films during the annealing at 40-80°C were systematically investigated by differential scanning calorimetry,wide-angle X-ray diffraction,gloss meter,tribometer,haze meter,tensile testing machine,heat sealer,and thickness gauge.The results show that the longer the annealing time and the higher the annealing temperature,the larger the shrinkage rate of BOPP films,the higher the crystallinity and crystal orientation after annealing.Meanwhile,the thickness,haze,friction coefficient,gloss,and heat seal strength change little,while the shrinkage rate decreases and tensile strength increases.This study provides theoretical guidance for improving the post-shrinkage of BOPP films.

关 键 词：双向拉伸聚丙烯薄膜 收缩 结晶 退火 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]