PREPREG AND FIBER-REINFORCED COMPOSITE MATERIAL

To provide a prepreg that ensures flame retardancy for fiber-reinforced composite materials regardless of their thicknesses, and to provide fiber-reinforced composite materials with superior flame retardancy regardless of their thicknesses.SOLUTION: A prepreg includes a fiber-reinforced substrate impregnated with a matrix resin composition. The matrix resin composition includes an epoxy resin, a curing agent, an organic metal phosphinate represented by the following formula, and a nitrogen flame retardant (where R1 and R2 independently represent an alkyl group or an aryl group, M is at least one selected from the group consisting of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Ni, Li, K, and Na, and m is an integer of 1-4).SELECTED DRAWING: None 【課題】繊維強化複合材料の厚みによらず難燃性を発現できるプリプレグを提供すること、および厚みによらず難燃性に優れた繊維強化複合材料を提供する。【解決手段】強化繊維基材にマトリックス樹脂組成物を含浸させてなるプリプレグであって、前記マトリックス樹脂組成物がエポキシ樹脂、硬化剤、下記式で表される有機ホスフィン酸金属塩、および窒素系難燃剤を含む、プリプレグ。TIFF2024005968000012.tif4287（式中、Ｒ１およびＲ２は各々独立にアルキル基またはアリール基を表す。Ｍは、Ｍｇ、Ｃａ、Ａｌ、Ｓｂ、Ｓｎ、Ｇｅ、Ｔｉ、Ｚｎ、Ｆｅ、Ｚｒ、Ｃｅ、Ｂｉ、Ｓｒ、Ｍｎ、Ｎｉ、Ｌｉ、Ｋ、およびＮａからなる群より選ばれる少なくとも１種であり、ｍは１～４の整数を表す。）【選択図】なし