Abstract:
Powdered epoxy coatings capable of rapid cure and flexibility are obtained by adding hydroxy pyridines to epoxy powder coatings hardened with aromatic anhydrides. Even faster cures can be obtained if the epoxy resin is prebranched with aromatic amines. Better cathodic protection under-cutting resistance is achieved by adding small amounts of 2,3-Epoxy-1-propanol to the prebranched epoxy resin.
Abstract:
A process for coating a steel substrate with a corrosion resistant film. This process consists of applying a liquid phenolic epoxy film to the heated substrate allowing this film to dry for a very short time, then applying a secondary coat consisting of a powdered epoxy resin containing a suitable crosslinking agent, and baking both at an elevated temperature to complete the cure.