| Tóm tắt |
In this study, the high UV-shielding nanocomposite coatings based on pure acrylic emulsion and R-TiO2\or ZnO nanoparticles were successfully prepared. The effect of the nanoparticles on the photostability and UV shielding efficiency has been studied by using a UV\condensation weathering chamber equipped with UVB-313 fluorescent lamps. The obtained results showed that the coatings with the 2 wt% R-TiO2\or ZnO nanoparticles and a thickness of 45 μm have the highest UV-shielding and photostability. These coatings could shield more than 98% (for R-TiO2) and 85% (for ZnO) of UV radiations in wavelength range from 230 to 380 nm. After 60 cycles of UV\CON exposure, color of coating samples protected by the R-TiO2 and ZnO nanocomposite coatings change insignificantly, their adhesion only decreased slightly, from their initial values of 2.5 and 2.4 to the values of 2.3 and 2.1 N\mm2, respectively. These nanocomposite coatings have possibly a promising potential for UV shielding applications. |