Waterborne Anticorrosion Coating Composition and Process for Providing a Corrosion-Resistant Coating on a Metal Surface

摘要

A waterborne coating composition, a process for providing a corrosion-resistant coating on a corrodible metal surface, an anticorrosion film formed by the composition, as well as an anticorrosive article, are disclosed. The coating composition comprises 10-35% by weight of one or more fluoropolymer; 30-65% by weight of one or more phenoxy resin; one or more crosslinking agent; a liquid carrier medium; and 0-40% by weight of an auxiliary binder consisting of one or more of polyethersulfone, polyphenylene sulfide, polyamide, polyimide, polyamideimide, polyether ether ketone, polyetherimide, polyurethane, alkyd resin, polyester, or acrylic polymers.

主权项

1. Process for providing a corrosion-resistant coating on one or more corrodible metal surface, comprising:
i) forming a layer of a waterborne coating composition on said surface, said composition comprising phenoxy resin, crosslinking agent for said resin, fluoropolymer, and a liquid carrier medium; ii) drying said layer; and iii) heating said layer to a temperature that causes a crosslinking reaction between said phenoxy resin and said crosslinking agent, wherein the heating step is performed at no greater than 290° C., to obtain as a result thereof said corrosion-resistant coating on said metal surface,
wherein the phenoxy resins are polyhydroxyether polymers having a number average molecular weight, Mn, greater than 15,000, and having terminal alpha-glycol groups; and wherein the term phenoxy resin includes modified phenoxy resins.