Prepreg
AssigneeToray Industries, Inc.
InventorsTakashi Ochi, Ryohei Watari, Atsuhito Arai
Life of this patent
Estimating the term…
Abstract
The present invention addresses the problem of providing a prepreg that yields a carbon fiber composite material that has exceptional tensile strength, heat resistance, and impact resistance and is suitable as a structural material of an aircraft body, wherein the resin composition used in the prepreg furthermore has exceptional viscosity stability, the prepreg containing a resin composition that contains carbon fibers and at least the constituent elements [A]-[D] as defined.
Claims10
A prepreg comprising carbon fiber and a resin composition comprising components [A] to [D]
- [A]:
- an epoxy resin containing [A1] and [A2],
- [A1]:
- a dicyclopentadiene type epoxy resin,
- [A2]:
- an epoxy resin containing [A2-1] and [A2-2],
- [A2-1]:
- a tetrafunctional liquid type epoxy resin,
- [A2-2]:
- a bifunctional liquid type epoxy resin,
- [B]:
- diaminodiphenyl sulfone,
- [C]:
- polyethersulfone, and
- [D]:
- perfect spherical polymer particles,
- wherein:
- the epoxy resin of component [A] contains [A1] and [A2], with [A1] having an epoxy equivalent of 200 g/eq or more and 253 g/eq or less and accounting for 5 parts by mass or more and 45 parts by mass or less relative to 100 parts by mass of the epoxy resin of component [A], and with [A2] accounting for 55 parts by mass or more and 95 parts by mass or less relative to 100 parts by mass of the epoxy resin of component [A],
- [A2] includes at least [A2-1] and [A2-2], the mass ratio of [A2-1]/[A2-2] being 0.7 or more and 4.0 or less,
- the resin composition shows a viscosity increase rate of 20% or less when maintained at 80° C. for 2 hours, and
- component [C] has a weight average molecular weight of 10,000 to 30,000 g/mol and accounts for 2 parts by mass or more and 11.3 parts by mass or less relative to 100 parts by mass of the epoxy resin of component [A].
A prepreg comprising component [E] impregnated with a resin composition comprising components [A] to [D-2]
- [A]:
- an epoxy resin containing [A1] and [A2],
- [A1]:
- a dicyclopentadiene type epoxy resin,
- [A2]:
- an epoxy resin containing [A2-1] and [A2-2],
- [A2-1]:
- a tetrafunctional liquid type epoxy resin,
- [A2-2]:
- a bifunctional liquid type epoxy resin,
- [B] diaminodiphenyl sulfone,
- [C] polyethersulfone,
- [D-2] thermoplastic resin particles, and
- [E] carbon fiber,
- wherein:
- [A1] has an epoxy equivalent of 200 g/eq or more and 253 g/eq or less and accounts for 45 parts by mass or more and 80 parts by mass or less relative to 100 parts by mass of the epoxy resin of component [A], and [A2-1] accounts for 10 parts by mass or more and 40 parts by mass or less relative to 100 parts by mass of the epoxy resin of component [A], and
- component [C] has a weight average molecular weight of 10,000 to 30,000 g/mol.
A prepreg comprising carbon fiber and a resin composition comprising components [A] to [D]
- [A]:
- an epoxy resin containing [A1], [A2-1], [A3], and [A4],
- [A1]:
- a dicyclopentadiene type epoxy resin,
- [A2-1]:
- a tetrafunctional liquid type epoxy resin,
- [A3]:
- a bifunctional glycidyl aniline type epoxy resin,
- [A4]:
- an epoxy resin other than [A1], [A2-1], and [A3],
- [B]:
- diaminodiphenyl sulfone,
- [C]:
- polyethersulfone, and
- [D]:
- perfect spherical polymer particles,
- wherein:
- the epoxy resin of component [A] contains 2 parts by mass or more and 15 parts by mass or less of [A1], 45 parts by mass or more and 65 parts by mass or less of [A2-1], 15 parts by mass or more and 35 parts by mass or less of [A3], and 0 parts by mass or more and 35 parts by mass or less of [A4], relative to 100 parts by mass of the epoxy resin of component [A], and
- [A1] has an epoxy equivalent of 200 g/eq or more and 253 g/eq or less.
Dependencies are inferred from the claim text.