通过红外光谱和热重分析考察了热水浸泡（老化）后热收缩带热熔胶的降解情况，测试了热熔胶在不同温度和经不同时间老化后的吸水率，分析了老化后热收缩带剥离强度与破坏性质、吸水率、热熔胶降解之间的关系，及导致热收缩带补口防腐蚀层失效的关键因素。结果表明：热收缩带黏结失效与其热熔胶降解关联不大，但与剥离试验中破坏性质和热熔胶高温吸水率具有较高的相关性；发生内聚破坏和热熔胶高温长期吸水率低的热收缩带具有更好的长期黏结稳定性。

The degradation of hot melt adhesive in heat shrinkable tapes after immersion in hot water (aging) was investigated by infrared spectroscopy and thermogravimetric analysis. The water absorption of hot melt adhesive at different temperatures and after being aged for different time was tested. The relationship between the peel strength of aged shrinkable tapes and the damage property, water absorption ratio and degradation of hot melt adhesive after aging were analyzed, and the key factors leading to the failure of anti-corrosion coating of heat shrinkable tape joint were also analyzed. The results show that the failure of adhesion of heat shrinkable tapes was irrelevant almost to the degradation of hot melt adhesive, but was relevant to the damage property in peeling test and water absorption of hot melt adhesive at high temperature. The heat shrinkable tape with cohesive failure and low long-term water absorption of hot melt adhesive at high temperature had good long-term bonding stability.