Anticorrosive coating composition

Abstract

The anticorrosive coating composition comprises a base agent (I) and a curing agent (II), wherein the base agent (I) comprises an epoxy resin (a), the epoxy resin (a) comprises at least one of a bisphenol A type epoxy resin (a-11) and a novolac type epoxy resin (a-12) having a weight average molecular weight of 6000 or more and 12000 or less, the curing agent (II) comprises a polyamine (b) and an alkylphenol (c), the polyamine (b) comprises an alicyclic polyamine (b-1) having a cyclic aliphatic hydrocarbon group to which an amino group is bonded and a non-alicyclic polyamine (b-2) having no cyclic aliphatic hydrocarbon group to which an amino group is bonded, and at least one of the base agent (I) and the curing agent (II) comprises an alkyl (meth)acrylate, an alkyl biphenyl, an alkyl acrylate, an alkyl tertiary amine ... an alkylphenol (c) having a structural unit derived from at least one monomer selected from the group consisting of diphenyl ether and olefin, and a vinyl-based defoaming agent (d) having a number average molecular weight of 30,000 to 100,000, or 300,000 to 2,000,000, wherein the content of the alicyclic polyamine (b-1) is 30% by mass to 80% by mass of the solid content of the curing agent (II), the content of the non-alicyclic polyamine (b-2) is 2% by mass to 45% by mass of the solid content of the curing agent (II), the content of the alkylphenol (c) is 5% by mass to 60% by mass of the solid content of the curing agent (II), and the content of the vinyl-based defoaming agent (d) is 0.005 parts by mass to 3 parts by mass relative to 100 parts by mass of the anticorrosive coating composition.

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