American Coatings Show 2018

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11.3 A New Waterborne Acrylic-Epoxy Hybrid Polymer for Metal Protection (Room 237-239)

10 Apr 18
3:00 PM - 3:30 PM

Tracks: Session 11: Epoxy Coatings, Session 11: Waterbased Coatings

Epoxy coatings are often used in applications over metal substrates due to their excellent performance properties, including corrosion resistance and chemical/solvent resistance. Inadequate properties of epoxy chemistry often include poor UV light durability and brittleness, and epoxy coatings often have poor gloss/color retention and resistance to chalking on exterior exposure as well as poor flexibility and impact resistance. Many epoxy coatings also contain solvents which contribute to high volatile organic content (VOC) levels. Relative to solventborne versions, waterborne epoxy coatings can often be formulated to lower VOC, but exterior durability and flexibility still remain a challenge. Combining excellent corrosion protection and chemical/solvent resistance with exterior durability, flexibility and low VOC in a coating based on epoxy chemistry is not an easy target. This paper will describe a new waterborne acrylic-epoxy hybrid polymer that facilitates formulation of two-component metal primers and direct-to-metal (DTM) finishes with this important balance of properties. The system has versatility in that the acrylic-epoxy hybrid polymer can be cured with either traditional waterborne amine hardeners or with acid-functional acrylic hardeners. Performance of the waterborne acrylic-epoxy hybrid technology in gloss DTM finishes and anticorrosive primers will be described, along with comparisons to traditional waterborne and solventborne epoxy coatings.