Curing agent for epoxy resins, and epoxy resin composition obtained using same

Patent metadata

Field	Value
Publication number	US-10435583-B2
Application number	US-201515527874-A
Country	US
Kind code	B2
Filing date	Nov 12, 2015
Priority date	Dec 3, 2014
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

Provided are a curing agent for epoxy resins, which is a curing agent capable of curing an epoxy resin at room temperature, and which can form a cured product (cured coating film) having excellent adhesion even to a substrate which is not in an environment completely dried, and an epoxy resin composition obtained using the same. A curing agent for epoxy resins, containing (a1) an aromatic amine, (a2) an aliphatic amine having an aromatic ring or a cycloalkane ring, and (a3) a curing accelerator, and an epoxy resin composition containing the curing agent and an epoxy resin.

First claim

The invention claimed is:

1. A curing agent for epoxy resins, comprising
(a1) an aromatic amine,
(a2) an aliphatic amine having an aromatic ring or a cycloalkane ring,
(a3) a curing accelerator, and
a xylene resin;
wherein the amount of the xylene resin is 5 to 15 parts by mass based on the total amount of the curing agent being 100 parts by mass;
wherein the curing accelerator (a3) is a phenol or a modification product thereof, an aromatic carboxylic acid, or an imidazole, and
wherein the amount of the aromatic amine (a1) is 50 to 60 parts by mass, the amount of the specific aliphatic amine (a2) is 20 to 30 parts by mass, and the amount of the phenol or the modification product thereof is 5 to 15 parts by mass, based on the total amount of the curing agent being 100 parts by mass.

2. The curing agent for epoxy resins according to claim 1 , wherein the aromatic amine (a1) is diaminodiphenylmethane, diethyltoluenediamine, or a modification product thereof.

3. The curing agent for epoxy resins according to claim 1 , wherein the aliphatic amine (a2) having an aromatic ring or a cycloalkane ring is benzylethylenediamine, benzylamine, or metaxylenediamine.

4. The curing agent for epoxy resins according to claim 1 , wherein the ratio of the aromatic amine (a1) and aliphatic amine (a2) used, in terms of a mass ratio represented by (a1)/(a2), is in the range of from 10/90 to 90/10.

5. The curing agent for epoxy resins according to claim 1 , wherein the ratio of the aromatic amine (a1) and aliphatic amine (a2) used, in terms of a mass ratio represented by (a1)/(a2), is in the range of from 50/50 to 80/20.

6. An epoxy resin composition, comprising (A) a curing agent for epoxy resins, and (B) a liquid epoxy resin,
Wherein the curing agent for epoxy resins comprising
(a1) an aromatic amine,
(a2) an aliphatic amine having an aromatic ring or a cycloalkane ring,
(a3) a curing accelerator, and
a xylene resin;
wherein the amount of the xylene resin is 5 to 15 parts by mass based on the total amount of the curing agent being 100 parts by mass;
wherein the liquid epoxy resin (B) contains (b1) a bisphenol epoxy resin, and at least one of (b2) a polyhydric alcohol glycidyl ether and (b3) an aliphatic carboxylic acid glycidyl ester; and
wherein the mass ratio of the bisphenol epoxy resin (b1)/(polyhydric alcohol glycidyl ether (b2)+ polybasic acid glycidyl ester (b3)) is in the range of from 70/30 to 90/10.

7. The epoxy resin composition according to claim 6 , wherein the polyhydric alcohol glycidyl ether (b2) is 1,6-hexanediol diglycidyl ether.

8. The epoxy resin composition according to claim 6 , further comprising (c) a reactive functional group-containing silane coupling agent.

9. The epoxy resin composition according to claim 6 , which is a primer for concrete, a jointing material for concrete, or a repair material for concrete.

10. The epoxy resin composition according to claim 6 , wherein the aromatic amine (a1) is diaminodiphenylmethane, diethyltoluenediamine, or a modification product thereof.

11. The epoxy resin composition according to claim 6 , wherein the curing accelerator (a3) is a phenol or a modification product thereof, an aromatic carboxylic acid, or an imidazole.

12. The epoxy resin composition according to claim 6 , wherein the aliphatic amine (a2) having an aromatic ring or a cycloalkane ring is benzylethylenediamine, benzylamine, or metaxylenediamine.

13. The epoxy resin composition according to claim 6 , wherein the ratio of the aromatic amine (a1) and aliphatic amine (a2) used, in terms of a mass ratio represented by (a1)/(a2), is in the range of from 10/90 to 90/10.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Tomura Tsugio
• Moriyama Hiroshi
• Kawahara Hideaki

Classifications

• C08G59/5026

  cycloaliphatic · CPC title

• C04B41/63

  Macromolecular compounds · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C08G59/5033

  aromatic · CPC title

• C04B41/4853

  Epoxides · CPC title