Key Factors Affecting Bonding Stability of Heat Shrinkable Tape Joint Anti-Corrosion Coating

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.