Epoxy resin composition for fiber-reinforced composite material

Patent metadata

Field	Value
Publication number	US-9353256-B2
Application number	US-201214116296-A
Country	US
Kind code	B2
Filing date	Apr 11, 2012
Priority date	May 9, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

The present technology is an epoxy resin composition for a fiber-reinforced composite material comprising a phosphorus-containing epoxy resin containing phosphorus in the skeleton thereof, a dicyandiamide, and a curing promoter containing at least one selected from 1,1′-(4-methyl-1,3-phenylene)bis(3,3-dimethylurea), phenyl-dimethylurea represented by the following formula (1), and methylene-diphenyl-bisdimethylurea represented by the following formula (2); wherein the phosphorus content of the phosphorus-containing epoxy resin is at least 1.0 mass % and at most 5.0 mass % in the epoxy resin composition.

First claim

What is claimed is:

1. An epoxy resin composition for a fiber-reinforced composite material comprising:
a phosphorus-containing epoxy resin containing phosphorus in a skeleton thereof;
at least one epoxy resin other than the phosphorus-containing epoxy resin;
a dicyandiamide; and
a curing accelerator containing at least one member selected from the group consisting of 1,1′-(4-methyl-1,3-phenylene)bis(3,3-dimethylurea), phenyl-dimethylurea represented by the following formula (1), and methylene-diphenyl-bisdimethylurea represented by the following formula (2);

wherein the phosphorus-containing epoxy resin is present in an amount of at least 75 parts by mass and at most 95 parts by mass with respect to 100 parts by mass of the total amount of the epoxy resins; and
wherein, the epoxy resin composition has a phosphorus content of at least 1.0 mass % and at most 5.0 mass %.

2. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , wherein the content of the curing accelerator is at least 1 part by mass and at most 15 parts by mass with respect to 100 parts by mass of a sum of the mass of the phosphorus-containing epoxy resin and other epoxy resins.

3. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 2 .

4. The epoxy resin composition for a fiber-reinforced composite material according to claim 2 , further comprising a phenoxy resin.

5. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 4 .

6. The epoxy resin composition for a fiber-reinforced composite material according to claim 4 , wherein the content of the phenoxy resin is at least 5 parts by mass and at most 40 parts by mass with respect to 100 parts by mass of a sum of the mass of the phosphorus-containing epoxy resin and other epoxy resins.

7. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 6 .

8. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , further comprising a phenoxy resin.

9. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 8 .

10. The epoxy resin composition for a fiber-reinforced composite material according to claim 8 , wherein the content of the phenoxy resin is at least 5 parts by mass and at most 40 parts by mass with respect to 100 parts by mass of a sum of the mass of the phosphorus-containing epoxy resin and the other epoxy resins.

11. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 10 .

12. A prepreg obtained by impregnating reinforcing fibers with the epoxy resin composition for a fiber-reinforced composite material according to claim 1 .

13. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , wherein a phosphorus content of the phosphorus-containing epoxy resin is at least 1.3 mass % and at most 3.0 mass % in the epoxy resin composition.

14. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , wherein the at least one epoxy resin other than the phosphorus-containing epoxy resin comprises a bisphenol epoxy resin.

15. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , wherein a compounded amount of the dicyandiamide is such that a ratio of equivalents of active hydrogen in the dicyandiamide to equivalents of epoxy in the epoxy resin composition excluding the dicyandiamide is at least 0.5 and at most 1.

16. The epoxy resin composition for a fiber-reinforced composite material according to claim 15 , wherein a compounded amount of the dicyandiamide is such that a ratio of equivalents of active hydrogen in the dicyandiamide to equivalents of epoxy in the epoxy resin composition excluding the dicyandiamide is at least 0.6 and at most 0.8.

17. The epoxy resin composition for a fiber-reinforced composite material according to claim 1 , wherein the content of the curing accelerator is at least 3 part by mass and at most 10 parts by mass with respect to 100 parts by mass of a sum of the mass of the phosphorus-containing epoxy resin and other epoxy resins.

Assignees

• Iwata Mitsuhiro
• Ito Tomohiro
• Yokohama Rubber Co Ltd

Inventors

• Iwata Mitsuhiro
• Ito Tomohiro

Classifications

• C08G59/304

  containing phosphorus · CPC title

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08G59/686

  containing nitrogen · CPC title

• C08L63/00 Primary

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C08G59/4021

  Ureas; Thioureas; Guanidines; Dicyandiamides · CPC title