Study on Preparation and Performance of Polyurethane Hot Melt Adhesive Films

Polyurethane hot melt adhesive films (PHMAFs) are green adhesives without any solvent. In this study, a series of polyurethane hot melt adhesive films with different crosslinking agent content were successfully synthesized. The melting temperature, water absorption, mechanical properties, and adhesion properties were studied. The results illustrate that the introduction of crosslinking agent could endow PHMAFs with better final adhesion strengths and water resistance ability, but also lead to decrease of tensile stress at break and elongation at break. The final T-peel strength of the films was in the range of 76.54-114.53 N/cm, which could meet the requirements of the industrial gluing in footwear.