The present invention addresses the problem of providing: an epoxy resin composition which enables the production of a fiber-reinforced composite material having an excellent tensile strength utilization factor; a fiber-reinforced composite material which is produced using the epoxy resin composition; a molded article; and a pressure vessel. The present invention also addresses the problem of providing a pressure vessel which has a high weight reduction effect and is highly resistant to repeated loading upon the charging of a high-pressure gas and the pressure discharge. In order to achieve the problems, the epoxy resin composition according to the present invention comprises components [A] to [C] as mentioned below, wherein the component [C] is a component [c1] or [c2] as mentioned below and the rubbery state elastic modulus of a cured article produced by curing the epoxy resin composition in a dynamic viscoelasticity evaluation is 10 MPa or less: [A] phenyl glycidyl ether substituted by a tert-butyl group, a sec-butyl group, an isopropyl group or a phenyl group; [B] a bifunctional or higher aromatic epoxy resin; [C] a curing agent; [c1] an acid anhydride-type curing agent; and [c2] an aliphatic amine-type curing agent.
本发明所要解决的问题是:提供一种环氧
树脂组合物,该组合物能够生产出具有优异拉伸强度利用系数的纤维增强复合材料;提供一种使用该环氧
树脂组合物生产的纤维增强复合材料;提供一种模制件;以及提供一种压力容器。本发明还解决了提供一种压力容器的问题,该压力容器具有很高的减重效果,并且在充入高压气体和压力释放时具有很强的抗反复加载能力。为了实现上述问题,根据本发明的环氧
树脂组合物包括如下所述的组分[A]至[C],其中组分[C]为如下所述的组分[c1]或[c2],通过在动态粘弹性评估中固化环氧
树脂组合物而产生的固化物的橡胶态弹性模量为 10 兆帕或以下:[A] 被叔丁基、仲丁基、异丙基或苯基取代的
苯基缩水甘油醚;[B] 双官能度或更高的芳香族环氧
树脂;[C] 固化剂;[c1] 酸酐型固化剂;[c2] 脂肪胺型固化剂。