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    • 1. 发明授权
    • Carbodiimide-modified polymethylene polyphenylene polyisocyanates for
use in the preparation of polyisocyanurate-polyurethane foams
    • 用于制备聚异氰脲酸酯 - 聚氨酯泡沫的碳二亚胺改性聚亚甲基多亚苯基多异氰酸酯
    • US4424288A
    • 1984-01-03
    • US334158
    • 1981-12-24
    • John T. Patton, Jr.Peter T. KanThirumurti Narayan
    • John T. Patton, Jr.Peter T. KanThirumurti Narayan
    • C08G18/48C08G18/79C08G18/14C08G18/78
    • C08G18/797C08G18/4829C08G2105/02Y10S521/901Y10S521/902
    • Liquid carbodiimide-modified organic polyisocyanates are prepared by reacting a crude polymethylene polyphenylene polyisocyanate containing no more than 70 weight percent diphenylmethane diisocyanate with an isomer mixture of 40 to 100 weight percent 4,4'-, 0 to 50 weight percent 2,4- and 0 to 10 weight percent 2,2'-diphenylmethane diisocyanate and having an average functionality of 2.1 to 2.7 and a free NCO content of at least 30 percent weight percent in the presence of an effective amount of carbodimidization catalyst. Polyisocyanurate-polyurethane foams prepared by reacting the modified polyisocyanates and polyols selected from the group consisting of diethylene glycol and ethylene oxide adducts of trimethylolpropane, trimethylolethane, glycerine, pentaerythritol, .alpha.-methylglucoside, sucrose, toluene diamine and methylene dianiline in the presence of trimerization catalysts exhibit improved compression strengths and K-factors with low friability and smoke density.
    • 液体碳二亚胺改性的有机多异氰酸酯通过使含有不超过70重量%的二苯基甲烷二异氰酸酯的粗多亚甲基多亚苯基多异氰酸酯与40至100重量%的4,4'-,0至50重量%的2,4-和 0至10重量%的2,2'-二苯基甲烷二异氰酸酯,并且在有效量的碳二亚胺化催化剂存在下,其平均官能度为2.1至2.7,游离NCO含量为至少30重量%。 通过在三聚催化剂存在下,使改性多异氰酸酯和选自二甘醇和三羟甲基丙烷,三羟甲基乙烷,甘油,季戊四醇,α-甲基葡糖苷,蔗糖,甲苯二胺和亚甲基二苯胺的环氧乙烷加成物反应制备的聚异氰脲酸酯聚氨酯泡沫 表现出改善的压缩强度和具有低脆性和烟密度的K因子。