Polyurethane reaction mixts. contg. three poly-ol reactants - for mfr. of car components with variable wall thickness

摘要

Polyol component comprises (a) 15-96 pt. of a polyether polyol grafted with styrene and/or acrylonitrile; (b) 2-75 pt. of a trifunctional polyether polyol of mol. wt. 4000-7000 and OH value 23-35; (c) 2-60 pt. of a difunctional polyether polyol of mol. wt. 3000-6000 and OH value 23-28. Blowing agent is used in amt. of 10-25% and may be partially replaced by air. Reinforcing fibres may be present. Used for externally located vehicle components having thinner walls and lower specific wt. without affecting the structural strength and heat resistance. The surface of the component is pore-free and suitable for painting.