SIZING-AGENT-COATED CARBON FIBRE BUNDLE, CARBON-FIBRE-BUNDLE PRODUCTION METHOD, AND PREPREG

摘要

The present invention provides a sizing-agent-coated carbon fibre bundle obtained by coating a carbon fibre bundle with a sizing agent including an aliphatic epoxy compound (C) and an aromatic epoxy compound (D). When measured using a single-fibre-composite fragmentation method, carbon fibres included in the carbon fibre bundle exhibit a fibre breakage number of at least 2.0/mm when single-fibre apparent stress is 15.3 GPa, and a fibre breakage number of not more than 1.7/mm when single-fibre apparent stress is 12.2 GPa. Furthermore, in a separate embodiment of the present invention, a prepreg includes the sizing-agent-coated carbon fibre bundle, an epoxy compound (A), and an aromatic amine curing agent (B). The present invention provides: a prepreg for preparing a carbon fibre composite material exhibiting an excellent tensile modulus, and an excellent perforated plate tensile strength; and a sizing-agent-coated carbon fibre bundle used as a staring material for said prepreg.