Epoxy resin composition and fiber reinforced composite material using epoxy resin composition
View Patent ↗A composition useful as a matrix for fiber-reinforced composites possesses a viscosity at 25° C. of no more than 1000 mPa·s and provides a cured product displaying a breaking elongation of at least 5%. The composition comprises (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), a polyvalent epoxy resin formed from a mononuclear aromatic backbone (B), an aromatic amine curing agent (C), and a rubber (D).
1. An epoxy resin composition with a viscosity at 25° C. of no more than 1000 mPa·s, comprising (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), a diglycidylaniline resin or a derivative thereof, an aromatic amine curing agent (C), and a rubber constituent (D), wherein a cured product produced by curing said epoxy resin composition displays a breaking elongation of at least 5%.
2. An epoxy resin composition with a viscosity at 25° C. of no more than 1000 mPa·s, comprising 100 parts by weight of (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), 20 to 100 parts by weight of a diglycidylaniline resin or a derivative thereof, no more than 100 parts by weight of a trivalent epoxy resin formed from a mononuclear aromatic backbone (B2), a phenylenediamine derivative represented by a formula (1) shown below as an aromatic amine curing agent (C), and 1 to 20 parts by weight of a rubber constituent (D),
(wherein, R 1 , R 2 and R 3 represent any one of a methyl group, an ethyl group, an oxymethyl group and a thiomethyl group, and R 1 , R 2 and R 3 may be identical or different), wherein a cured product produced by curing said epoxy resin composition displays a breaking elongation of at least 5%.
3. An epoxy resin composition according to claim 1 , wherein said rubber constituent (D) is an acrylic rubber.
4. An epoxy resin composition according to claim 2 , wherein said trivalent epoxy resin formed from a mononuclear aromatic backbone (B2) is a triglycidyl-p-aminophenol epoxy resin.
5. An epoxy resin composition according claim 2 , wherein a fracture toughness value K IC is at least 0.8 MPa m 1/2 .
6. An epoxy resin composition according to claim 2 , wherein a cured product thereof displays a glass transition temperature of at least 100° C. and an elastic modulus of at least 3 GPa.
7. An epoxy resin composition according to claim 2 , wherein said rubber constituent (D) is an acrylic rubber.
8. A fiber reinforced composite material comprising an epoxy resin composition according to claim 2 as a matrix resin.
9. An epoxy resin composition with a viscosity at 25° C. of no more than 1000 mPa·s, comprising (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), a diglycidyl-o-toluidine resin, an aromatic amine curing agent (C), and a rubber constituent (D), wherein a cured product produced by curing said epoxy resin composition displays a breaking elongation of at least 5%.
10. An epoxy resin composition according to claim 9 , wherein said rubber constituent (D) is an acrylic rubber.
11. An epoxy resin composition with a viscosity at 25° C. of no more than 1000 mPa·s, comprising 100 parts by weight of (A) at least one of a bisphenol epoxy resin (A1) and a phenol novolak epoxy resin (A2), 20 to 100 parts by weight of a diglycidyl-o-toluidine resin, no more than 100 parts by weight of a trivalent epoxy resin formed from a mononuclear aromatic backbone (B2), a phenylenediamine derivative represented by a formula (1) shown below as an aromatic amine curing agent (C), and 1 to 20 parts by weight of a rubber constituent (D),
(wherein, R 1 , R 2 and R 3 represent any one of a methyl group, an ethyl group, an oxymethyl group and a thiomethyl group, and R 1 , R 2 and R 3 may be identical or different), wherein a cured product produced by curing said epoxy resin composition displays a breaking elongation of at least 5%.
12. An epoxy resin composition according to claim 11 , wherein said rubber constituent (D) is an acrylic rubber.
13. An epoxy resin composition according to claim 11 , wherein said trivalent epoxy resin formed from a mononuclear aromatic backbone (B2) is a triglycidyl-p-aminophenol epoxy resin.
14. An epoxy resin composition according claim 11 , wherein a fracture toughness value K IC is at least 0.8 MPa m 1/2 .
15. An epoxy resin composition according to claim 11 , wherein a cured product thereof displays a glass transition temperature of at least 100° C. and an elastic modulus of at least 3 GPa.
16. A fiber reinforced composite material which comprises an epoxy resin composition according to claim 2 as a matrix resin.