Improving Weathering Performance of Beech Wood Coated with Acrylic Paint by nano zinc oxide and nano cellulose

Clear coatings, such as transparent acrylic paint, have a relatively short life in outdoor exposure because solar radiation can readily penetrate through such coatings and reach the wood surfaces and cause degradation in cell walls of wood tissues. This phenomenon can be reduced by using suitable UV absorbers in the structure of coatings. Therefore, in this study, the transparent acrylic coatings were modified with nano cellulose (1 wt%) and nano zinc oxide (0 and 0.5 wt%) and then applied on Beech wood specimens by brush.Subsequently, these specimens were exposed to natural weathering for six months. The results of pull-off adhesion, contact angle, colorimeter, ATR-FTIR spectroscopy and microscopy images showed that the use of nano zinc oxide and nano cellulose increased weathering resistance of coated samples where the weathering degradations of these samples were minimum in compare to others.