THE USE OF EVAPORATIVE COOLANTS TO MANUFACTURE FILLED POLYURETHANE COMPOSITES

摘要

Polyurethane composites and methods of preparation are described herein. The methods of making the polyurethane composite can include mixing (1) at least one isocyanate selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, (2) at least one polyol, (3) an inorganic filler, and (4) an evaporative coolant in an extruder to form a mixture. The method also include extruding the mixture into a mold cavity, generating heat in the mold cavity from the reaction of the at least one isocyanate and the at least one polyol, and allowing the evaporative coolant to migrate to an interface between the mixture and the interior mold surface. The temperature of the mixture causes evaporation of the evaporative coolant at the interface thereby removing heat at the interface. Suitable evaporative coolants for use in the methods of making the polyurethane composites include hydrofluorocarbons and hydrochlorofluorocarbons.

主权项

1. A method of making a polyurethane composite comprising:
mixing (1) at least one isocyanate selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, (2) at least one polyol, (3) an inorganic filler, and (4) an evaporative coolant in an extruder to form a mixture; extruding the mixture into a mold cavity, said mold cavity formed by at least an interior mold surface; generating heat in the mold cavity from the reaction of the at least one isocyanate and the at least one polyol; allowing the evaporative coolant to migrate to an interface between the mixture and the interior mold surface; forming a molded article from the mold; and removing the molded article from the mold. wherein the temperature of the mixture causes evaporation of the evaporative coolant at the interface thereby removing heat at the interface.