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    • 47. 发明授权
    • Process for the preparation of elastic polyurethane flexible foams
usable in cold-mold techniques to produce molded articles
    • 用于制备可用于冷模技术的弹性聚氨酯软质泡沫塑料的制备方法来生产模塑制品
    • US4668708A
    • 1987-05-26
    • US869199
    • 1986-05-30
    • Gerhard MuellerMatthias MarxWolfgang JarreEdwin BaumannIngolf Buethe
    • Gerhard MuellerMatthias MarxWolfgang JarreEdwin BaumannIngolf Buethe
    • C08G18/10C08G18/14
    • C08G18/10Y10S521/914
    • The invention is a process for the preparation of elastic polyurethane flexible foams having densities from approximately 25 to 60 kg/m.sup.3, and producing molded articles in closed molds at temperatures from 25.degree. to 80.degree. C., comprising reacting(A) an organic polyisocyanate prepolymer having an isocyanate content from 6 to 20 percent by weight prepared by reacting a toluene diisocyanate and/or a diphenylmethane diisocyanate with a di- to tetrafunctional polyether polyol having a hydroxyl number from 20 to 50 and oxyethylene terminal group content of at least 10 to 30 percent by weight(B) a mixture of compounds containing reactive hydrogen atoms, comprising a mixture of(a) from 55 to 89.5 parts by weight of at least one di- to tetrafunctional polyether polyol having a hydroxyl number of from 20 to 80 and less than 10 percent by weight terminal oxyethylene groups,(b) from 0.5 to 20 parts by weight of at least one alkanolamine, and(c) from 10 to 25 parts by weight water, in the presence of(C) a blowing agent,(D) a catalyst, and optionally(E) auxiliaries and/or additives.
    • 本发明是制备密度为约25至60kg / m 3的弹性聚氨酯柔性泡沫体的方法,并且在封闭模具中在25℃至80℃的温度下生产模制品,其包括使(A)有机多异氰酸酯 预聚物的异氰酸酯含量为6〜20重量%,其通过使甲苯二异氰酸酯和/或二苯基甲烷二异氰酸酯与羟基数为20至50的二至四官能团聚醚多元醇反应制备,氧乙烯基端基含量为至少10至 30重量%(B)含有反应性氢原子的化合物的混合物,其包含(a)55至89.5重量份的至少一种羟基数为20至80的二官能或四官能团聚醚多元醇的混合物,以及 末端氧乙烯基少于10重量%,(b)0.5至20重量份的至少一种链烷醇胺,和(c)10至25重量份的水, (C)发泡剂,(D)催化剂和任选的(E)助剂和/或添加剂。