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    Process for making aqueous polyurethane dispersions
    7.
    发明授权
    Process for making aqueous polyurethane dispersions 失效
    制备水性聚氨酯分散体的方法

    公开(公告)号：US5717024A

    公开(公告)日：1998-02-10

    申请号：US606370

    申请日：1996-02-23

    申请人： Pravin K. Kukkala ,  Andrew J. Kielbania ,  Andrew P. Full ,  Antonios Tontisakis

    发明人： Pravin K. Kukkala ,  Andrew J. Kielbania ,  Andrew P. Full ,  Antonios Tontisakis

    IPC分类号： C08G18/10 ,  C08G18/08 ,  C08G18/12 ,  C08J3/00 ,  C08K3/20 ,  C08L75/00

    CPC分类号： C08G18/12 ,  C08G18/0823 ,  C08G18/0866

    摘要： A process for preparing aqueous dispersions of polyurethanes comprises dispersing polyurethane prepolymer containing unreacted --NCO functionality in water with moderate agitation at a temperature at or below 65.degree. C., preferably at or below 38.degree. C., and more preferably within the range 38.degree.-25.degree. C.; simultaneously reducing the agitation to a mild rate and maintaining the temperature within the range 38.degree.-85.degree. C., preferably, 60.degree.-65.degree. C., until the reaction of --NCO with water levels off; adding an effective amount of a quenching agent to react with sufficient --NCO functionality to reduce the number of available --NCO groups that can react with water so that the evolution of CO.sub.2 is reduced or eliminated during storage of the polyurethane dispersion; and at any of the previous sequential steps adding an effective amount of a deaerating agent to reduce or eliminate CO.sub.2 foaming or to liberate any dissolved CO.sub.2 gas.

    摘要翻译： 一种制备聚氨酯水分散体的方法包括在温度等于或低于65℃，优选在或低于38℃，更优选在38℃的范围内，在适度搅拌下，将含有未反应的-NCO官能团的聚氨酯预聚物分散在水中。 -25℃。 同时将搅拌减至温和，并将温度保持在38℃-85℃，优选60-65℃的范围内，直到-NCO与水的反应失去水平; 添加有效量的淬灭剂以与足够的-NCO官能团反应以减少可与水反应的可用-NCO基团的数量，从而在聚氨酯分散体储存期间减少或消除CO 2的逸出; 并且在任何先前的顺序步骤中，添加有效量的脱气剂以减少或消除CO 2发泡或释放任何溶解的CO 2气体。