Carbon fiber reinforced composite and production method of carbon fiber reinforced composite
The present invention provides a carbon-fiber-reinforced composite that can reduce the curing time and achieve high mechanical strength while reducing resin bleeding, and a method for producing a carbon-fiber-reinforced composite. Provided is a carbon-fiber-reinforced composite containing: carbon fibers, an epoxy resin, a curing agent, and a thermoplastic resin, wherein a mixture of the epoxy resin and the thermoplastic resin has a ratio of viscosity at 30° C. to viscosity at 90° C. (viscosity at 30° C./viscosity at 90° C.) of less than 100.
1 . A carbon-fiber-reinforced composite comprising:
carbon fibers;
an epoxy resin;
a curing agent; and
a thermoplastic resin,
wherein a mixture of the epoxy resin and the thermoplastic resin has a ratio of viscosity at 30° C. to viscosity at 90° C. (viscosity at 30° C./viscosity at 90° C.) of less than 100,
the thermoplastic resin is a polyvinyl acetal resin, and
the polyvinyl acetal resin has a hydroxy group content of 16.0 mol % or more and 45.0 mol % or less.
2 . The carbon-fiber-reinforced composite according to claim 1 ,
wherein the thermoplastic resin has a glass transition temperature of 60° C. or higher.
3 . The carbon-fiber-reinforced composite according to claim 1 ,
wherein the polyvinyl acetal resin has structural units represented by the following formula (1):
wherein each R 1 represents an alkyl group having a carbon number of 1 or greater, and R 1 s may be the same as or different from each other.
4 . The carbon-fiber-reinforced composite according to claim 1 , which is used as a prepreg.
5 . The carbon-fiber-reinforced composite according to claim 1 ,
wherein the epoxy resin contains a bisphenol A epoxy resin.
6 . The carbon-fiber-reinforced composite according to claim 1 , which contains 0.01 parts by weight or more and 40 parts by weight or less of the thermoplastic resin relative to 100 parts by weight of the epoxy resin.
7 . The carbon-fiber-reinforced composite according to claim 1 , which contains 0.5 parts by weight or more and 300 parts by weight or less of the epoxy resin relative to 100 parts by weight of the carbon fibers.
8 . A method for producing a carbon-fiber-reinforced composite, comprising at least the steps of:
forming a resin composition containing an epoxy resin, a curing agent, and a thermoplastic resin; and
forming a composite of the resin composition with carbon fibers,
wherein a mixture of the epoxy resin and the thermoplastic resin has a ratio of viscosity at 30° C. to viscosity at 90° C. (viscosity at 30° C./viscosity at 90° C.) of less than 100,
the thermoplastic resin is a polyvinyl acetal resin, and
the polyvinyl acetal resin has a hydroxy group content of 16.0 mol % or more and 45.0 mol % or less.