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    • 5. 发明授权
    • Catalyzed one-shot system for molding thermoset polyurethanes
    • 催化一次性成型热固性聚氨酯的系统
    • US4119594A
    • 1978-10-10
    • US802139
    • 1977-05-31
    • Stanley A. IobstHoward W. Cox
    • Stanley A. IobstHoward W. Cox
    • C08G18/22C08G18/66
    • C08G18/222C08G18/6674
    • According to a preferred practice of the invention, thermoset polyurethanes are molded from a mixture of solid particles of hydroquinone di-(beta-hydroxyethyl)ether (HQEE) and zinc stearate dispersed in a liquid mixture of a polyether polyol and a liquid form of diphenylmethane diisocyanate. The use of the HQEE chain extender and the zinc stearate catalyst provides a unique one-shot molding mixture that is relatively unreactive at room temperature, but polymerizes and cures rapidly upon heating. It has a pot life of at least several hours and is suitable for use in injection molding equipment generally used in processing thermoplastic material.
    • 根据本发明的优选实践,热固性聚氨酯由分散在聚醚多元醇和液体形式的二苯基甲烷的液体混合物中的氢醌二(β-羟乙基)醚(HQEE)和硬脂酸锌的固体颗粒的混合物形成 二异氰酸酯。 使用HQEE扩链剂和硬脂酸锌催化剂提供了独特的一次性模塑混合物,其在室温下相对不反应,但在加热时聚合并快速固化。 它具有至少几个小时的适用期,适用于通常用于加工热塑性材料的注塑设备。