Polyurethanes cured with amines and their preparation
    30.
    发明申请
    Polyurethanes cured with amines and their preparation 失效
    用胺固化的聚氨酯及其制备方法

    公开(公告)号:US20090149621A1

    公开(公告)日:2009-06-11

    申请号:US12009873

    申请日:2008-01-23

    IPC分类号: C08G18/10 C08G18/28

    摘要: Polyurethane prepolymers are described which are prepared from 2,4′-diiso-cyanate diphenylmethane (2,4′-MDI), a polyol component and an aliphatic diisocyanate. These prepolymers can be cured with aliphatic, cycloaliphatic and/or aromatic amines to form a cured urethane elastomer. In comparison to cured urethane elastomers based on monomeric 2,4′-MDI, these prepolymers provide elastomers with extended pour life, i.e. they exhibit a slower rate of viscosity buildup after curative and prepolymer are mixed which results in a reduced propensity to crack during the curing process and gives the opportunity to cast larger parts. In comparison to polyurea/urethanes prepared from cured TDI-prepolymers and which optionally include H12-MDI, the prepolymers of the invention have better health and safety aspects.

    摘要翻译: 描述了由2,4'-二异氰酸酯二苯基甲烷(2,4'-MDI),多元醇组分和脂族二异氰酸酯制备的聚氨酯预聚物。 这些预聚物可以用脂肪族,脂环族和/或芳族胺固化以形成固化的聚氨酯弹性体。 与基于单体2,4'-MDI的固化的聚氨酯弹性体相比,这些预聚物提供具有延长的浇注寿命的弹性体,即它们在固化剂和预聚物混合后表现出较慢的粘度增长速率,这导致在 固化过程,给予机会铸造更大的零件。 与由固化的TDI-预聚物制备并且任选地包括H12-MDI的聚脲/聚氨酯相比,本发明的预聚物具有更好的健康和安全性。