To provide a prepreg and a carbon fiber reinforced composite material that are excellent in adhesion between a matrix resin and carbon fibers and long-term storage stability and also excellent in microcrack resistance due to the increased toughness. The present invention provides a prepreg that includes; agent-coated carbon fibers coated with a sizing agent; and a thermosetting resin composition impregnated into the sizing agent-coated carbon fibers. The sizing agent includes an aliphatic epoxy compound (A) and an aromatic epoxy compound (B1). The sizing agent-coated carbon fibers are in a shape of woven fabric or braid. The thermosetting resin composition includes a thermosetting resin (D), a thermoplastic resin (F), and a latent hardener (G). The sizing agent-coated carbon fibers have an (a)/(b) ratio in a certain range where (a) is the height of a component at a binding energy assigned to CHx, C—C, and C═C and (b) is the height of a component at a binding energy assigned to C—O in a C
1s
core spectrum of the surfaces of the sizing agent-coated carbon fibers analyzed by X-ray photoelectron spectroscopy.
提供一种预浸料和碳纤维增强复合材料,其在基体
树脂和碳纤维之间具有优异的附着性和长期储存稳定性,并且由于增加韧性而具有优异的微裂纹抗性。本发明提供一种预浸料,其包括:涂有分散剂的碳纤维;以及浸渍在涂有分散剂的碳纤维中的热固性
树脂组合物。分散剂包括脂肪族环氧化合物(A)和芳香族环氧化合物(B1)。涂有分散剂的碳纤维呈编织物或编织带状。热固性
树脂组合物包括热固性
树脂(D)、热塑性
树脂(F)和潜在硬化剂(G)。涂有分散剂的碳纤维在X射线光电子能谱分析的表面C1s谱中,具有(a)在分配给CHx、C—C和C═C的结合能处的组分高度和(b)在分配给C—O的结合能处的组分高度之间的(a)/(b)比率在一定范围内。