The present invention aims to provide an epoxy resin composition that is high in both fast curability and storage stability, a prepreg prepared by using the epoxy resin composition, and a fiber reinforced composite material prepared by curing the prepreg.
The epoxy resin composition contains the following components [A], [B], [C], and [D] and meets the following requirements [a], [b], and [c]:
[A]: epoxy resin,
[B]: dicyandiamide,
[C]: aromatic urea,
[D]: borate ester,
[a]: 0.014≤(content of component [D]/content of component [C])≤0.045,
[b]: 0.9≤(number of moles of active groups in component [A]/number of moles of active hydrogen in component [B])≤1.2, and
[c]: 14≤(content of component [A]/content of component [C])≤25.
本发明旨在提供一种快速固化性和储存稳定性都很高的环氧
树脂组合物、一种使用该环氧
树脂组合物制备的预浸料,以及一种通过固化该预浸料制备的纤维增强复合材料。
环氧
树脂组合物包含以下组分[A]、[B]、[C]和[D],并满足以下要求[a]、[b]和[c]:
[A]:环氧
树脂、
[B]:双
氰胺、
[C]:芳香族
脲
[D]:
硼酸酯、
[a]:0.014≤(组分[D]含量/组分[C]含量)≤0.045、
[b]:0.9≤(组分[A]中活性基团的摩尔数/组分[B]中活性氢的摩尔数)≤1.2,以及
[c]:14≤(组分[A]的含量/组分[C]的含量)≤25。