“Split-phase” Glycolysis of Flexible PUF Wastes and Application of Recovered Phases in Rigid and Flexible Foams Production

Abstract

Abstract The uses of polyurethane foams have been increased too much as new abilities are known for these polymers. This increments lead to an ecological problem. They have low density, occupying large spaces and not easy degradable. This causes environmental pollution that is a disadvantage of artificial materials. In this study, waste flexible polyurethane foams based on MDI with a trans-esterification process were converted to new material containing OH functional groups in “split-phase glycolysis” (SPG) condition. In this process, products are separated in two phases that could be reused in the production process of new PUFs. This process is one of the best solutions for ecological problem and applicable for every PU structure polymer with its proper variations. This process has the capability to produce flexible and rigid polyols which can be used to make PU foams with high recyclate content. The similarity of upper and lower phases to the virgin one has been characterized, using FTIR, GPC, and other instrumental methods. Both phases of recyclate were introduced in new PUF formulation, comparing the results with original foam. Keywords: Cold cureFlexibleGlycolysisPolyurethane foamRecyclingRigid