REGENERATION OF WASTE MATERIAL OF POLYURETHANE RESIN

摘要

PURPOSE:To produce a regenerated polyurethane having excellent physical properties such as high modulus of elasticity and high tensile strength by using a waste liquor of diol-containing polyol as a raw material of binder and molding under a constant condition. CONSTITUTION:Ground material of polyurethane resin waste material is mixed with a blend of diol and isocyanate or a prepolymer prepared from the diol and isocyanate as a binder and molded by heating under pressure at 130-160 deg.C under 160-300kg/cm<2>. The prepolymer is produced from the diol and the isocyanate in order to leave 5-15% unreacted -NCO group and the heating and pressurizing molding is carried out by using the prepolymer under a relatively high-pressure, high-temperature condition. The waste material is ground to preferably 10mu-5mm particle diameters.