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    • 7. 发明授权
    • Process for the preparation of fluorochlorohydrocarbon-free, low-density
polyurethan soft foams and soft elastic polyurethan molding foams and
polyisocyanate mixtures modified with urethan groups on
diphenylmethane-diisocyanate base
    • 用于制备氟代氯代烃,低密度聚氨酯软泡沫和柔性弹性聚氨酯成型泡沫的方法和在二苯基甲烷二异氰酸酯基础上用氨基甲酸酯基团改性的多异氰酸酯混合物
    • US5374667A
    • 1994-12-20
    • US24589
    • 1993-03-01
    • Werner HinzRuth ZschiescheHeinz-Dieter LutterBernd Bruchmann
    • Werner HinzRuth ZschiescheHeinz-Dieter LutterBernd Bruchmann
    • C08G18/10C08G18/48C08G18/76C08G18/80C08G18/00
    • C08G18/8035C08G18/10C08G18/4837C08G18/7664C08G2101/0008C08G2101/005C08G2101/0083Y10S521/914
    • The invention provides a method for the preparation of fluorochlorohydrocarbon(FCHC)-free polyurethane soft (molded) foam materials with low density, by reactingA) liquid polyisocyanate mixtures containing bound urethane groups, containing 22 to 30 weight percent of NCO groups, which in turn are prepared by reacting a mixture of diphenylmethane-diisocyanate and polyphenyl-polymethylene-polyisocyanates (raw MDI) with at least one polyoxypropylene-polyoxyethylene-polyol with a functionality between 2.5 and 3.5, a hydroxyl number between 50 and 90 and a polymerized ethylene oxide group concentration ranging from more than 30 to less than 50 weight percent, relative to the weight of the polymerized ethylene oxide and 1,2 propylene oxide groups, or by reacting of 4,4'diphenylmethane-diisocyanate (MDI) or and MDI-isomeric mixture with the above-named polyoxypropylene-polyoxyethylene-polyol to an NCO-group-containing quasi-prepolymer, and diluting this quasi-prepolymer with raw-MDI, withB) higher-molecular polyhydroxyl compounds and, if appropriateC) low-molecular chain lengthening and/or cross-linkage-promoting materialsD) propellants,E) catalysts as well as if appropriate,F) auxiliary materials and/or additives, as well as the polyisocyanate mixtures modified with urethane groups (A) which are utilizable in accordance with the process of the invention.
    • 本发明提供了一种通过使含有22-30%(重量)NCO基团的结合的氨基甲酸酯基团的液体多异氰酸酯混合物反应来制备低密度的氟氯烃(FCHC) - 软质(模塑)泡沫材料的方法, 通过使二苯基甲烷 - 二异氰酸酯和聚苯基 - 多亚甲基多异氰酸酯(原MDI)与至少一种官能度在2.5和3.5之间,羟基数在50和90之间的聚氧化丙烯 - 聚氧乙烯 - 多元醇与聚合的环氧乙烷 相对于聚合的环氧乙烷和1,2-环氧丙烷基团的重量,或通过4,4'-二苯基甲烷二异氰酸酯(MDI)或MDI异构体(MDI)的反应,组浓度范围从大于30至小于50重量% 与上述聚氧丙烯 - 聚氧乙烯 - 多元醇的混合物与含有NCO基的准预聚物混合,并用B-MDI稀释该准预聚物,B) 高分子量多羟基化合物,如果合适C)低分子链延长和/或交联促进材料D)推进剂,E)催化剂以及适当的F)辅助材料和/或添加剂,以及 用氨基甲酸酯基团(A)改性的多异氰酸酯混合物,其可根据本发明的方法使用。