Material for molding, shaped product therefrom, and method for manufacturing shaped product

摘要

There is a material for molding including carbon fiber bundles to be easily impregnated, including carbon fibers and at least one impregnation aid in an amount of 3 to 15 parts by mass based on 100 parts by mass of the carbon fibers and satisfying a specific requirement, wherein 50 to 2,000 parts by mass of a thermoplastic polyamide is adhered to the carbon fiber bundles to be easily impregnated.

主权项

1. A material for molding comprising:
carbon fiber bundles including carbon fibers and at least one impregnation aid in an amount of 3 to 15 parts by mass based on 100 parts by mass of the carbon fibers, wherein the at least one impregnation aid is a p-hydroxybenzoic acid alkyl ester in which an alkyl group thereof has 14 or more carbon atoms, the at least one impregnation aid satisfying the following requirements 1 to 3; and a thermoplastic polyamide in an amount of 50 to 2000 parts by mass based on 100 parts by mass of the carbon fibers, the thermoplastic polyamide adhered to the carbon fiber bundles: Requirement 1: liquid at 280° C. has a viscosity of 10 Pa·s or less; Requirement 2: a reduction ratio in a glass transition temperature (ΔTg) of larger than 0.2 (° C./%), the reduction ratio in glass transition temperature (ΔTg) being defined by the following expression (A) including a glass transition temperature Tg1 (° C.) of a resin composition obtained by incorporating the impregnation aid in an amount of 1 part by mass to 100 parts by mass based on 100 parts by mass of the thermoplastic polyamide, the glass transition temperature Tg0 (° C.) of the thermoplastic polyamide, and a content (%) of the impregnation aid:
Reduction ratio in glass transition temperature (ΔTg) (° C./%)=((Tg0 (° C.))−(Tg1 (° C.))/(content of impregnation aid (%))  (A) wherein the content of impregnation aid (%) is defined by the following expression (B):
Content of impregnation aid (%)=100×(amount of impregnation aid (parts by mass))/(amount of the thermoplastic polyamide (parts by mass))  (B); and Requirement 3: a boiling point under normal pressure is 340° C. or more and a heating loss at 300° C. under a nitrogen atmosphere is 2%/minute or less.