The Preparation and Properties of Polyurethane/Nano-CeO2 Hybrid Aqueous Coating

To improve the ultraviolet resistance and thermal stability of waterborne polyurethane, stable waterborne polyurethane/nano-cerium oxide hybrid dispersions were obtained by adding nano-cerium colloids to previously synthesized waterborne polyurethane dispersions. The dried ceria colloid was characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The XRD results indicated the prepared CeO2 was a face-centered cubic structure. The prepared polyurethane/CeO2 dispersions were studied by dynamic light scattering (DLS), transmission electron microscopy (TEM), UV-Vis spectroscopy and accelerated weathering test. The dried polyurethane/CeO2 films were characterized using thermogravimetric analysis (TGA). The DLS analysis indicated the particles average diameter of hybrids emulsion was bigger than that of the pure waterborne polyurethane dispersion. TG analysis and accelerated weathering test suggested the hybrid latex films had better thermal stability and mechanical properties than those of the pure waterborne polyurethane. The UV-Vis absorption capacity of the dispersions prepared was increasing with the amount of CeO2 colloid increased.