Sustainable biocarbon/tung oil coatings with hydrophobic and UV-shielding properties for outdoor wood substrates

With wood regaining substantial interest as a construction material due to sustainability concerns and aesthetics trends, efficient safe protection methods are needed prevent the discouloration loss of mechanical properties this renewable UV-sensitive material. In study, sustainable coatings comprising 0 20 wt% biocarbon (BC) dispersed in tung oil were developed for protection. BC particles added ultraviolet (UV) absorbers produced by various carbonization routes. The powders characterized terms particle size surface functional groups Fourier-Transform infrared, UV visible absorbance water solutions related these characteristics. Two wooden substrates (beech oak) coated with samples underwent six months onsite weathering. While total colour change uncoated oil-coated without kept increasing over time resulted clear alteration aesthetics, an increased content led enhanced stability, close 2 both species after weathering 10 BC. Coating made substrates, initially hydrophilic, become hydrophobic, further introduction hydrophobicity. However, increase was not correlated repellence, highest contact angle being observed 5 % BC, no improvement hydrophobicity higher content. negatively affected repellence all (i.e., reference content). best protected decrease induced