Accelerated ageing-induced effects on surface properties of wood veneers treated with a modified water-based coating system
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2017, Vol 98, Issue
Abstract
Accelerated ageing-induced effects on surface properties of wood veneers treated with a modified water-based coating system. This work investigates accelerated ageing-induced effects on quality of tree-of-heaven veneer surfaces finished with a water-based coating system applied in several colour hues. This coating system has been modified for surface treatment intended for outdoor exposure. The issues studied were: colour stability, morphological changes in the treated wood expressed through its roughness parameters, and its resistance against wetting with liquids. The results demonstrate that the coating system had a high resistance against photo-degradation. Under the wet mode (UV radiation with rainfall simulation), some colour changes were present, and the coating turned darker and more matt. These changes, however, were not immediately observable visually. The ageing induced a moderate increase in roughness and it also enhanced the variability of the roughness parameters. Higher values of roughness and waviness parameters were obtained perpendicular to the grain course. The experimental results confirmed an appropriate water-resistance of the coating system tested. The contact angles occurring during wetting with water exceeded 90°. This ensured effective protection for wood surface against water during ageing, and the overall stability of the system wood solid-coating.
Authors and Affiliations
JOZEF KÚDELA
Keywords
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