Preparation of Water-Borne Self-Crosslinking Polymeric Binder with Flash Rust Resistance

Abstract

This paper deals with a facile fabrication of a self-crosslinking acrylic latex coating binder comprising embedded nanoparticles originated from MgO in the role of a flash rust inhibitor. The incorporation of nanostructured MgO was performed during the latex synthesis carried out by a semi-continuous emulsion polymerization technique. For the covalent self-crosslinking, diacetone acrylamide was copolymerized into the polymer to provide sites for the subsequent reaction with adipic acid dihydrazide. The latex storage stability and coating performance were compared with respect to the concentration of incorporated nanoparticles (0.5–2 wt.% based on monomers). It was found that all coating binder compositions containing inorganic nanoparticles exhibited a long-term shelf-life stability and provided crosslinked smooth transparent coating films of high gloss. The binder compositions synthesized using 1–2 wt.% of nanostructured MgO (related to monomers) provided coatings with enhanced solvent resistance and inhibited flash rust pronouncedly.