Intensity of colour changes of spruce wood treated with selected coatings for windows during natural and xenotest weathering
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2015, Vol 89, Issue
Abstract
In this work was searched colour stability of spruce wood (Picea abies Karst L.) painted with fine yellow-brown “pinia” pigmented (3 types) or transparent (4 types) coating systems recommended for wooden windows. Natural weathering was performed in accordance with the EN 927-3:2000 during 12, 24 and 36 months under a slope of 45° or 90° in smog environment of Zvolen, and accelerated weathering in Xenotest in accordance with the EN 927-6:2006 lasting from 1 to 12 weeks. Colour parameters of painted wood have been measured in the CIE-L*a*b* system using the Color Reader CR10. Finally the total colour differences ΔE were calculated. Colour stability of the pigmented coating systems was evidently better in comparison to the transparent ones. Comparing the total colour changes ΔE at the natural and accelerated weathering the following knowledge were determined: (1) by the accelerated ageing in Xenotest can be modeled the natural ageing under a slope of 90°; (2) on the other hand, higher total colour differences in exterior under a slope of 45° can be caused by a more intensive absorption of UV-light and by a more evident catching of emissions on surfaces of tested samples already in the first times of exposure.
Authors and Affiliations
MILOŠ PÁNEK, LADISLAV REINPRECHT
Keywords
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