Fluorine-Free Nonisocyanate Polyurethane Antismudge Coating Carrying 4,5-Epoxycyclohexane-1,2-dicarboxylic Acid Diglycidyl Ether Groups

Abstract

4,5-Epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ether cyclic carbonate (EDDC) was synthesized by chemical addition of carbon dioxide with 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidylester (EDD) and then cross-linked with isophorondiamine (IPDA) and amino-modified poly(dimethylsiloxane) (AMPDMS) to prepare a unique fluorine-free antismudge nonisocyanate polyurethane coating (NIPU). Notably, the specific surface energy of NIPU was affected dramatically by the AMPDMS component. When its content was 1.0 wt %, the NIPU demonstrated more than 98% optical transmittance with a surface roughness of about 0.401 nm. Moreover, the NIPU coatings exhibited remarkable repellency toward different liquids, such as pump oil, corn oil, water, milk, cola, orange juice, fingerprint solution, and so on, where the CaCO₃ powders could slide down with water, and no liquid droplets or CaCO₃ powder remained on the coating surface. When applied to different substrate surfaces including glass, tinplate, and ceramics, the NIPU coatings still demonstrated strong antigraffiti performance. Therefore, the NIPU possessed excellent easy-to-clean, antismudge property and wear resistance, showing great application prospects.