2-propylimidazole as a reactive diluent and catalyst in waterborne epoxy formulations: a comprehensive review abstract: waterborne epoxy resin systems are gaining prominence as environmentally benign alternatives to solvent-borne coatings. this article comprehensively reviews the application of 2-propylimidazole (2-pi) in waterborne epoxy formulations, focusing on its dual role as a reactive diluent and a catalyst for...