The preparation and bonding property of PET-steel composite sheet with the interlayer of PU film

Abstract The PET-steel composite sheet with the interlayer of PU film has been produced, and the effect of interlayer thickness on the interface bonding strength has been researched. The experimental results indicate that the PET-PU-steel composite sheet would have a good interface bonding strength, which would decrease gradually and finally become stable as the PU film thickness increases. There would always be some residual PU film on the steel surface after the peeling test, no matter what the PU film thickness is, and the interface failure mode would always be the mixed failure mode. However, the quantity of residual PU film on the steel surface following the peeling test decreases progressively and eventually stabilizes as the thickness of the PU film increases.