Postcure treatment for polyurethanes reaction injection molded.

摘要

PROCESS FOR TREATING polyurethane prepolymers, polyurethane / urea and polyurea MOLDEADOS reaction injection comprising exposing a polyurethane polymer, polyurethane / urea or polyurea injection molding and reaction to an amount of energy INFRARROJA SUFFICIENT TO RAISE THE TEMPERATURE pOLYMER A 180 C AT LEAST AND MAINTAIN The temperature of the polymer at or above that temperature for a sufficient time to increase impact strength of GARDNER, measured according to ASTM D-3029, COMPARED WITH THE SAME polymer It has been heated to the same temperature and maintained it during the same time in a convection oven. With the invention OBTAINED REMARKABLE IMPROVEMENTS AS TO THE PROPERTIES OF SHOCK, Buckling thermal and heat distortion temperature and therefore particularly suitable in rapid PREPARATION PARTS USING A CARRIER OF MASS PRODUCTION AND IS ESPECIALLY SUITABLE FOR THE PREPARATION OF PIECES TO WHICH WILL SUBMIT A PROCEDURES AFTER HIGH TEMPERATURE, AS THE PROCEDURE OF "PLASTER TYPE E".