Abstract
In this study, the effect of UV stabilizers (dihydroxy benzophenone and nano zinc oxide) on the weathering degradation of water-based acrylic coating on beech wood was investigated. The wood specimens were coated by brush and then weathered naturally for six months. The obtained results showed that the use of nano zinc oxide reduced color changes and mold growth on the surface of weathered samples. However, the results of contact angle, pull-off adhesion, colorimeter and FTIR revealed that the dihydroxyl benzophenone was not effective in preventing weathering degradation of coated wood.
Highlights
Some studies have shown that the use of zinc oxide (ZnO) as a UV absorber in coatings improves weathering performance of coated wood samples
This study aimed to compare the efficiency of dihydroxy benzophenone and ZnO nanoparticles against weathering of coated wood
Raw wood as a control sample (CS) unmodified (UN), modified with 0.5 wt% of dihydroxy benzophenone (UA) and 0.5 wt% of ZnO nano particles (ZN) coatings were applied on wooden surfaces by brush and allowed to dry for 48 hours
Summary
Incorporation of organic and inorganic UV absorbers and hindered amine light stabilizers (HALS) is necessary due to the development of transparent coatings. These compounds are used for the retardation and elimination of photochemical processes in polymers (Malanowski, 2009). Among the inorganic UV absorbers, zinc oxide has a long history of color protection It has the advantage of a higher photo permanence compared to organic stabilizers (Saha et al, 2011; Wang and Tooley, 2011).
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