Plastic moulded parts made of polyurethane and their usage

摘要

Polyurethane based compact plastic molding comprises (a) organic polyisocyanates and/or polyisocyanate prepolymers; (b) filler free polyol components; (c) at least one catalyst; (d) optionally stabilizers; and (e) additives. The component (b) contains: (b1) polyether polyol (21-70 wt.%) with a functionality of 2-6, an equivalent weight of 210-2100, an portion of ethylene oxide group of 10-74 wt.% and a portion of primary hydroxyl group of greater than 50, preferably greater than 70; and (b2) a polyol (30-79 wt.%) having an equivalent weight of 210-2100 and a functionality of 2-6.