Adhesive Technologies using Recycled/Renewable Based Polyester Polyols

摘要

Each year, millions of tons of spent molecules are deposited in landfills and any further use they might offer is lost. At Resinate, we have developed proprietary technology that allows us to harvest those valuable molecules and extend their lifecycle by upcycling them into higher value applications, including polyester polyols. For this study, a series of recycled and renewable content polyester polyols were designed and synthesized for adhesive technologies such as reactive hot melt adhesives (RHMA) and solventless adhesives. The target number average molecular weight (Mn) of polyester polyols was ranging from 400 to 4,000 g/mole, and selected isocyanates (eg. MDI or HDI trimer) were used for prepolymer synthesis of RHMA or as a component of 2K adhesive system. Standard lap shear (ASTM D1002) adhesion performances of the adhesives were evaluated with several different substrates (e.g. polycarbonate, polyvinyl chloride, etc.) with environmentally controlled curing conditions (i.e. 25°C, RH 50%), and also high temperature/high humidity aging condition (i.e. 70°C and 95 %RH for 7 days) was applied to monitor aging performances of the adhesives for selective substrates. Thermal behaviors (i.e. crystallization, glass transition, and melting point) of the polyester polyols were assessed by differential scanning calorimetry (DSC), and it was determined that adhesion performance of three RHMA can be customized by changing crystallization behavior and characteristics of these polyester polyols.