US 7,018,715 B2 · Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal

Abstract

Provided are an organic coated steel having an epoxy resin layer coated on the surface of the steel product, which is formed by curing an epoxy resin composition comprising an epoxy resin and an epoxy resin curing agent as principal components and which has an oxygen permeability coefficient of 2 ml-mm/m2·day·MPa or less at a temperature of 23° C. and a relative humidity of 60% RH, an organic coated steel having the above epoxy resin layer and a polymer resin layer laminated in order on the surface of a steel product and a rust preventing method for metal in which a coating layer of the above epoxy resin layer is formed on the surface of metal. The above epoxy resin layer has a high gas barrier property and a good adhesive property even under wide temperature and humidity environment, and therefore the organic coated steel and the rust preventing method for metal according to the present invention make it possible to provide a steel product having a high rust preventive and corrosion preventive effect even under severe environment and extend the life of the steel product.

Claims24

Dependent claims

An organic coated steel having an epoxy resin layer and a polymer resin layer laminated in order on the surface of a steel product, wherein said epoxy resin layer is formed by curing an epoxy resin composition comprising an epoxy resin and an epoxy resin curing agent as principal components and said epoxy resin layer has an oxygen permeability coefficient of 2 ml-mm/m2·day·MPa or less at a temperature of 23° C. and a relative humidity of 60% RH,

wherein said epoxy resin layer comprises 30% by weight or more of a skeletal structure represented by the following Formula (1)

An organic coated steel having an epoxy resin layer coated on the surface of a steel product, wherein said epoxy resin layer is formed by curing an epoxy resin composition comprising an epoxy resin and an epoxy resin curing agent as principal components and said epoxy resin layer has an oxygen permeability coefficient of 2 ml-mm/m2·day·MPa or less at a temperature of 23° C. and a relative humidity of 60% RH,

wherein said epoxy resin layer includes 30% by weight or more of a skeletal structure represented by the following Formula (1)
and said epoxy resin curing agent comprises a reaction product of (A) and (B) or a reaction product of (A), (B) and (C) described below:
(A) a polyamine selected from the group consisting of aliphatic amines, aliphatic amines having aromatic ring, alicyclic amines and aromatic amines,
(B) a multifunctional compound having at least one acyl group which can form an amide group part by reacting with the polyamine to form an oligomer, and
(C) monovalent carboxylic acid having 1 to 8 carbon atoms and/or a derivative thereof.

2 more elements

A rust preventing method for metal in which a coating layer is formed on the surface of metal, wherein said coating layer is formed by curing an epoxy resin composition comprising an epoxy resin and an epoxy resin curing agent as principal components, and said coating layer has an oxygen permeability coefficient of 2 ml-mm/m2·day·MPa or less at a temperature of 23° C. and a relative humidity of 60% RH,

wherein said coating layer includes 30% by weight or more of a skeletal structure represented by the following Formula (1)
and said epoxy resin curing agent comprises a reaction product of (A) and (B) or a reaction product of (A), (B) and (C) described below:
(A) a polyamine selected from the group consisting of aliphatic amines, aliphatic amines having aromatic ring, alicyclic amines and aromatic amines,
(B) a multifunctional compound having at least one acyl group which can form an amide group part by reacting with the polyamine to form an oligomer, and
(C) monovalent carboxylic acid having 1 to 8 carbon atoms and/or a derivative thereof.

2 more elements

Dependencies are inferred from the claim text.

Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal

Life of this patent

Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal

Life of this patent

Abstract

Claims24