To maintain stabilized adhesion to a galvanized surface for a long period of time without being affected by the surface conditions, for example, the difference between the new and old galvanized surfaces or the degree of surface treatment which the galvanized surface has undergone by incorporating an epoxy resin, a modified aliphatic polyamine compound blended therewith in a specific ratio and a phenol- modified hydrocarbon resin into a coating composition.
A base resin component comprises an epoxy resin (A) constituting the main skeleton of a bisphenol A type, a bisphenol F type or a bisphenol AD type and having an epoxy equivalent of 350-650 and a phenol-modified hydrocarbon resin (B) having a phenolic hydroxyl group with a hydroxyl number in a range of 50-100 mgKOH/g in an amount of 50-100% by weight in terms of a solids content, based on the weight of the component A, and other pigments, additives and solvents which may be optionally blended. A modified epoxy resin-based coating composition is provided as a two-pack coating composition by blending the base resin component with a curing agent comprising a modified aliphatic polyamine compound having an equivalent ratio of the polyamine compound to the component A of 0.5-0.7, and other pigments, additives and solvents which may be optionally blended. The composition is suitable for coating onto a galvanized surface.
HASHIMOTO YASUKI
YASUKAWA ICHIRO
| JPH09263713A | 1997-10-07 | |||
| JPH05202318A | 1993-08-10 | |||
| JPH0320375A | 1991-01-29 | |||
| JPS63183966A | 1988-07-29 | |||
| JPH01172466A | 1989-07-07 |
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