Carbon fiber bundles with sizing agent and their manufacturing method, carbon fiber reinforced composite materials and pressure vessels

Abstract

The carbon fiber bundle with sizing agent of the present invention is designed to improve the morphological stability, abrasion resistance and resin impregnation of the carbon fiber bundle. It consists of carbon fiber bundles with a count of 6,000 to 50,000, a thickness of 0.10 mm to 0.20 mm, a thickness variation coefficient of 6.5% or less, a sag value of 6 cm to 9 cm, and using resin formulation A. The tensile strength of the strand (strand tensile strength A') evaluated according to JIS R7608 (2007) is 4.9 GPa or more and 6.7 GPa or less.

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