申请人:HERCULES INCORPORATED
公开号:EP0604909A2
公开(公告)日:1994-07-06
Epoxy resin compositions having improved storage stability before curing and improved thermal and mechanical performance after curing comprise a mixture of a polyepoxide and a curing agent that is reactive with the polyepoxide. The epoxy resin composition is characterized by a glass transition temperature of less than 20°C, measured under standard conditions, after subjecting the epoxy resin composition to a specified thermal cycle. For attaining this, the curing agent should possess a melting point and a heat of fusion lying in area A of fig.1. The preferred curing agents are aromatic diamines, for example, 3,7-diaminodibenzothiophene-5,5-dioxide; 3,7-diaminophenothiazine sulfone, 3,7-diamino-N-methylphenothiazine sulfone; 2,7-diamino-9-fluorenone and 2,4,6,8-tetramethyl-3,7-diaminothioxanthene sulfone. Also claimed are prepregs and composites made therefrom containing the epoxy compositions in combination with reinforcing agents.
环氧树脂组合物在固化前具有更好的储存稳定性,在固化后具有更好的热性能和机械性能,该组合物包括一种聚环氧化物和一种与聚环氧化物反应的固化剂的混合物。环氧树脂组合物的特点是,在标准条件下,将环氧树脂组合物置于特定的热循环中后,玻璃化转变温度小于 20°C。为此,固化剂的熔点和熔融热应在图 1 的 A 区域内。首选的固化剂是芳香族二胺,例如:3,7-二氨基二苯并噻吩-5,5-二氧化物;3,7-二氨基吩噻嗪砜;3,7-二氨基-N-甲基吩噻嗪砜;2,7-二氨基-9-芴酮和 2,4,6,8-四甲基-3,7-二氨基噻吨砜。此外,还要求获得含有环氧树脂组合物和增强剂的预浸料及其复合材料。