Polyurethanes from dialkyl diaminobenzenes and processes therefor
    3.
    发明授权
    Polyurethanes from dialkyl diaminobenzenes and processes therefor 失效
    来自二烷基二氨基苯的聚氨酯及其工艺

    公开(公告)号:US4526905A

    公开(公告)日:1985-07-02

    申请号:US612965

    申请日:1984-05-23

    摘要: Dialkyl diamines for use with polyols and polyisocyanates in cast elastomer and reaction injection molding polyurethane processes. The dialkyl diamines are prepared by nitration and reduction of dialkylbenzenes or alkylation of meta-phenylenediamine. The chain extenders have the following structure: ##STR1## where R.sub.1 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl and R.sub.2 is C.sub.2 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl.Contrary to the teachings of the prior art the novel diamines have surprisingly good reaction times to form polyurethanes with excellent physical properties. Furthermore, little or no mold release is required in RIM and other processes using the chain extenders of the invention.

    摘要翻译: 用于浇铸弹性体中的多元醇和多异氰酸酯的二烷基二胺和反应注塑聚氨酯工艺。 二烷基二胺通过硝化和还原二烷基苯或间苯二胺的烷基化来制备。 扩链剂具有以下结构:其中R 1是C 1 -C 6烷基或C 3 -C 6环烷基,R 2是C 2 -C 6烷基或C 3 -C 6环烷基。 与现有技术的教导相反,新型二胺具有令人惊奇的良好反应时间以形成具有优异物理性能的聚氨酯。 此外,在使用本发明的扩链剂的RIM和其它方法中,很少或不需要脱模。