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    • 2. 发明授权
    • Hot-foamable, thermosetting epoxy resin mixture
    • 热发泡,热固性环氧树脂混合物
    • US4798848A
    • 1989-01-17
    • US190326
    • 1988-05-05
    • Hermann Diethelm
    • Hermann Diethelm
    • C08J9/10
    • C08J9/10C08J2363/00
    • Cured foams with a high degree of closed cellular structure, good stability under prolonged heat exposure and good compressive strength can be produced from a hot-foamable, thermosetting epoxy resin mixture containing (a) an epoxy resin or a mixture of epoxy resins with an average epoxide content of 4.4 to 5.0 equivalents/kg and an average epoxide functionality of more than 2.0, (b) a novolak with a hydroxyl equivalent weight of 90 to 120, 0.8 to 0.95 hydroxyl equivalents of component (b) being present in the epoxy resin mixture per 1 epoxide equivalent of component (a), (c) 1.0 to 1% by weight, based on the amount of components (a) and (b), of a curing accelerator, (d) 0.5 to 10% by weight, based on the amount of components (a) and (b), of a blowing agent which splits off nitrogen above 100.degree. C. with decomposition, (e) 0.3 to 1% by weight, based on the total amount of the epoxy resin mixture, of an emulsifier, and if appropriate (f) foam modifiers.
    • 具有高度封闭的细胞结构的固化泡沫体,在长时间的热曝光下具有良好的稳定性和良好的抗压强度可以由含有(a)环氧树脂或环氧树脂与平均混合物的热可发泡热固性环氧树脂混合物 环氧化物含量为4.4〜5.0当量/平均环氧官能度大于2.0,(b)羟基当量为90〜120的酚醛清漆,(b)成分的羟基当量为0.8〜0.95,存在于环氧树脂 基于组分(a)和(b)的量,组分(a),(c)为1.0至1重量%的混合物,(d)0.5至10重量% 基于组分(a)和(b)的量,分解出100℃以上的氮分解发泡剂,(e)基于环氧树脂混合物的总量为0.3〜1重量% 的乳化剂,如果合适的话(f)泡沫改性剂。