Waterborne epoxy-modified polyurethane-acrylate dispersions with nano-sized core-shell structure particles: synthesis, characterization, and their coating film properties

• DOI: 10.1515/polyeng-2016-0003
• Publication Date: 2016-06-15T16:55:50Z
• Authors: Jing Sun; Huagao Fang; Haili Wang; Shanzhong Yang; Shengrong Xiao; Yunsheng Ding
• Keywords: Thermogravimetric analysis

Abstract Waterborne epoxy-modified polyurethane-acrylate (EPUA) dispersions with nano-sized core-shell structure particles, polyacrylate (PA) as core and polyurethane (EPU) shell, were successfully prepared via a two-step procedure. The waterborne EPU first synthesized to serve seeds, then the butyl acrylate (BA) methyl methacrylate (MMA) monomers introduced into particles form polymeric by radical polymerization under assistance of ultrasonic treatment. Fourier transform infrared (FT-IR) spectroscopy revealed that epoxy PA components incorporated onto chain PU EPUA, respectively. transmission electron microscopy (TEM) photograph demonstrated EPUA have structure. as-prepared coating films exhibited good thermo-stability mechanical properties, thermogravimetric analysis (TGA) tensile testing, results potentiodynamic polarization curves immersion corrosion testing in 5 wt% NaCl aqueous solution both anticorrosive properties mainly depended on mass content PA, optimized value 30 wt%.