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Process for preparing open-cell, cold-mouldable, rigid polyurethane-foams and their use for procuding roof linings of cars
Process for preparing open-cell, cold-mouldable, rigid polyurethane-foams and their use for procuding roof linings of cars
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机译:制备开孔,可冷模制的硬质聚氨酯泡沫的方法及其在生产汽车车顶衬里中的用途
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摘要
Prodn of cold-formable, open-cell rigid polyurethane foam (I) involves reacting (a) polyisocyanates with (b) a polyol component of cpds. with at least 2 OH gps. and mol. wt. 187-10000, chain extenders and crosslinker with OH gps, and mol wt. 32-186 deg C, water as blowing agent, tert, maine catalysts (II) and opt. silicone foam stabilisers (III). The novel features are that (a) is a mixt. (crude MDI) of 70-90 (wt.)% diphenylmethane diisocyanate, 12-30 (15-25)% of which is 2,4'-isomer, and 10-30% polyphenyl-polymethylene polyisocyanates and (b) is a mixt. of 50-70% di- and/or trifunctional polyether polyols with OH number 28-600, 20-35% phthalate polyester diola with OH mnumber 150-440, 2-10% glycerol, 3.5-7% water, 0.3-1% (II), which can be included in (I) and opt 0.1-2% (III).
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