Abstract
Glycolysis of rigid polyurethane (PU) has been investigated to provide useful data for the recycling of waste refrigerators. The glycolysis experiments were performed under atmospheric pressure in a stirred flask kept at a constant temperature. Diethylene glycol (DEG) and potassium acetate (KAc) were used as the solvent and catalyst in the glycolysis system, respectively. The properties of the glycolysis products were determined by analyzing the hydroxyl value, mass mean molecular weight ( M w), viscosity, and the conversion of the –NCOO– functional group in PU. The results indicate that an adequate concentration of KAc is about 2% of the weight of the PU and an adequate reaction time is about 2 h. The yields of glycolysis products are about 87–95% for our experimental conditions. Thus, the recovery of liquid products containing polyols can be achieved by the distillation of glycolysis products.
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