Preparation and artificial weathering properties of Ce/TiO2/BTA-HALS coating on heat-treated wood surface

Abstract

Heat-treated wood has only short-term weathering resistance, while wood cracking, discoloring and other problems will appear in long-term outdoor environments. Therefore, it is necessary to enhance the anti-weathering properties of heat-treated wood. In this study, organic ultraviolet absorbers, light stabilizers and inorganic Cerium/Titanium dioxide (Ce/TiO₂) ultraviolet shielding agents were compounded by the simple physical blending method, and the modifiers were loaded on the surface of heat-treated wood by brushing method. The UV-Vis spectrum showed the high transparency and UV shielding of the composite coating. After artificial weathering, the color difference (ΔE) of Ce/TiO₂/BTA-HALS coated sample was only 1.64 and 2.68, which is significantly lower than 2.3 and 6.1 of the heat-treated sample. The surface roughness, scanning electron microscope and X-ray energy spectrum also showed that the stability of the coating was significantly improved, and the loss of inorganic particles has decreased. Fourier transform infrared spectroscopy and electron paramagnetic resonance proved that the modifier was successfully grafted on the surface of heat-treated wood. The composite coating has a certain synergistic effect in improving the weathering resistance of heat-treated wood and improves the film-forming property of the modifier and the stability of the coating during weathering.