Journal
JOURNAL OF POLYMER ENGINEERING
Volume 37, Issue 2, Pages 113-123Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/polyeng-2016-0003
Keywords
core-shell structure; epoxy-modified polyurethane-acrylic dispersion; nano-sized particle; waterborne
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Funding
- National Natural Science Foundation of China [51373045]
- National High Technology Research and Development Program (863 Program) of China [2015AA033903]
- Key Project of Anhui Province [1301021016]
- AVIC Beijing Institute of Aeronautical Materials [cxy2012HFGD24]
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Waterborne epoxy-modified polyurethane-acrylate (EPUA) dispersions with nano-sized core-shell structure particles, with polyacrylate (PA) as core and epoxy-modified polyurethane (EPU) as shell, were successfully prepared via a two-step procedure. The waterborne EPU dispersions were first synthesized to serve as seeds, and then the butyl acrylate (BA) and methyl methacrylate (MMA) monomers were introduced into EPU particles to form polymeric core by radical polymerization under the assistance of ultrasonic treatment. Fourier transform infrared (FT-IR) spectroscopy revealed that the epoxy and PA components were successfully incorporated onto the chain of the PU and EPU to form EPU and EPUA, respectively. The transmission electron microscopy (TEM) photograph demonstrated that the EPUA particles have the core-shell structure. The as-prepared EPUA coating films exhibited good thermo-stability and mechanical properties, as revealed by thermogravimetric analysis (TGA) and tensile testing, respectively. The results of potentiodynamic polarization curves and immersion corrosion testing in 5 wt% NaCl aqueous solution both demonstrated that the anticorrosive properties of EPUA mainly depended on the mass content of PA, with the optimized value of 30 wt%.
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