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Recent Developments in Epoxy Coatings

Summary:
Epoxy coatings are the workhorses of the protective coatings industry. They have excellent chemical and corrosion resistance, high mechanical strength, good
adhesion to a variety of substrates and a combination of other properties that have made them a material of choice for providing cost effective, long termprotection on industrial, marine and offshore structures.
The major limitations of epoxy coatings are their relatively slow cure in cold climates and poor exterior color and gloss retention. The issue of color stability and chalking is typically addressed by topcoating with
aliphatic polyurethane, acrylic-siloxane, epoxysiloxane or other inherently weatherable coating (1, 2). Slow cure at low temperatures is a continuing problem. This paper briefly reviews some of the approaches used by protective coatings suppliers to address this limitation and presents information on a new epoxy coating. Application and performance property test data on the next generation of fast curing,
surface tolerant epoxy coatings is discussed and compared to state-of-the-art.
BACKGROUND ON SURFACE TOLERANT COATINGS
Coatings that can be applied over damp, chemically contaminated or rusty steel, old paint and other minimally prepared substrates are described as surface tolerant. Generic types include red lead alkyd, epoxy and aluminum epoxy mastic, urethane, coal tar mastic, modified wax and grease based coatings, chlorinated rubber, modified acrylic latex, calcium sulfonate alkyd and modified vinyl chloride latex (3, 4, 5). Another category of surface tolerant coating is the “rust
converter”.

Format:
Pages : 9
Size: 139 kb
Author : Norman R. Mowrer , Caroline Aviki: Ameron International Protective Coatings Group Brea, CA


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