Formulating novel aqueous epoxy

Two component, waterbased epoxy coatings can be classified by the type of epoxy resin employed. Low molecular weight, liquid epoxy systems are commonly referred to as Type I, whereas systems based on higher molecular weight, solid epoxy dispersions are referred to as Type II. This paper will focus on coatings based on both types of resins. In the first case, novel curing agent technology for use with liquid epoxy resins will be discussed. Benefits of this technology include formation of high performance, zero VOC coatings, with a visible end to the pot life and excellent anti-corrosive properties. More recently a new Type II epoxy technology has been developed, this technology offers the unique combination of good film formation while also providing the option of zero VOC formulations. Coatings formulated with this new resin exhibit properties on metal substrates that are equal in performance to conventional solvent based systems. Advantages include rapid lacquer dry, fast development of early water resistance and a long pot life. Performance properties of both technologies will be reviewed.