SBC热熔压敏胶在热塑性聚烯烃基材上的热老化机理研究  

Study on the thermal aging mechanism of SBC hot melt pressure sensitive adhesive on thermoplastic polyolefin substrate

作　　者：王瑾瑞 姚奕佳 陈楠 曾益龙 丁红梅[1] 方凯 刘志维[1] 王崇 徐大洲 Wang Jinrui;Yao Yijia;Chen Nan;Zeng Yilong;Ding Hongmei;Fang Kai;Liu Zhiwei;Wang Chong;Xu Dazhou(State Key Laboratory of Advanced Waterproof Materials,Beijing Oriental Yuhong Waterproof Technology Co.,Ltd.,Beijing 101300,China)

机构地区：[1]北京东方雨虹防水技术股份有限公司,先进防水材料全国重点实验室,北京101300

出　　处：《中国胶粘剂》2025年第4期18-25,共8页China Adhesives

摘　　要：设计了由苯乙烯嵌段共聚物(SBC)、增黏树脂和环烷油组成的热熔压敏胶(HMPSA)的基础配方,并将其涂布在热塑性聚烯烃(TPO)基材上得到自黏TPO卷材。以增黏树脂的种类作为单一变量,考察了5种软化点均在100℃附近的增黏树脂对HMPSA的黏度、软化点、流变行为、粘接性能的影响,并进一步跟踪了5种增黏树脂配方(HDCPD、A-HDCPD、HC5、HC9和RE)制备的自黏TPO卷材在80℃下热老化7 d过程中粘接性能、流变行为和化学成分的变化。研究结果表明:(1)对比5种不同增黏树脂制备的HMPSA配方老化前后的剥离强度可知,在80℃下热老化7 d后,HDCPD配方的剥离强度衰减程度最大,衰减率为48%;HC5配方衰减程度最小,衰减率为13%;RE配方剥离强度相对无处理反而提升了20%,但相对最高值(热老化1 d后的剥离强度)衰减了26%。(2)红外光谱结果表明,热老化前后HMPSA的化学成分并未发生明显变化,氧化降解并不是造成HMPSA剥离强度下降的主要原因。(3)4种石油树脂(HDCPD、A-HDCPD、HC5和HC9)配方体系的HMPSA,热老化过程中剥离强度持续衰减,同时在流变曲线上表现为玻璃化转变温度(Tg)持续向低温区移动,流动点(Tflow)向高温区移动,储能模量(G')上升;松香树脂RE配方体系的HMPSA较为特殊,剥离强度随热老化进行先上升后下降,且Tg先上升随后趋于稳定,G’持续上升。流变性能和剥离性能的变化规律呈现出良好的相关性,说明配方中增黏树脂和环烷油组分的迁移是热老化剥离强度下降的主要原因。(4)流变分析结果表明,5种增黏树脂向TPO基材中的迁移倾向从小到大依次为:RE<HC5<A-HDCPD<HC9<HDCPD。(5)热老化过程中,HMPSA中的增黏树脂向TPO基材迁移的趋势受树脂与SIS相容性和TPO相容性的共同影响,与SIS相容性越差同时与TPO相容性越好,越容易发生迁移;反之,则越不容易发生迁移。A basic formulation for hot melt pressure sensitive adhesive(HMPSA)composed of styrene block copolymer(SBC),tackifier resin,and cyclic oil was designed,and it was coated on thermoplastic polyolefin(TPO)substrate to obtain the self-adhesive TPO roll.Using the type of tackifier resin as a single variable,the effects of five types of tackifier resins with softening points around 100℃on the viscosity,softening point,rheological behavior,and bonding properties of HMPSA were investigated.Furthermore,the changes in bonding properties,rheological behavior,and chemical composition of self-adhesive TPO rolls prepared with five types of tackifier resin formulations during thermal aging at 80℃for 7 d were further tracked.The research results showed that,(1)Comparing the peel strength of HMPSA formulations prepared with 5 different tackifier resins before and after aging,it could be seen that after thermal aging at 80℃for 7 d,the peel strength of HDCPD formulation decreased the most,with an attenuation rate of 48%.The HC5 formulation had the smallest degree of attenuation,with an attenuation rate of 13%.The peel strength of RE formulation increased by 20%compared to no treatment,but the highest value(peel strength after 1 d of thermal aging)decreased by 26%.(2)The infrared spectroscopy results showed that there was no significant change in the chemical composition of HMPSA before and after thermal aging,and oxidative degradation was not the main reason for the decrease in HMPSA peel strength.(3)The HMPSA of four petroleum resin formulations(HDCPD,A-HDCPD,HC5,and HC9)showed a continuous decrease in peel strength during thermal aging,while the rheological curve showed a continuous shift of glass transition temperature(Tg)towards the low temperature zone,a shift of flow point(Tflow)towards the high temperature zone,and an increase in storage modulus(G').The HMPSA of rosin resin RE formulation system was quite unique,with peel strength first increasing and then decreasing with thermal aging,and Tg first increasing and then

关 键 词：热熔压敏胶 热塑性聚烯烃 热老化 流变行为 迁移 

分 类 号：TQ430[化学工程]