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1 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

1 2018

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Visual properties of spruce wood coated with lacquers, changed under impact of UV radiation in indoor conditions

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Kúdela J. , Sikora A. , Svocák J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

tom No. 103

84--89

This work evaluates accelerated-ageing-induced effects imposed on colour stability of spruce wood coated with colourless polyurethane lacquers proposed for surface treatment for wood artefacts intended for the indoor. There were explored the colour and gloss variations at an accelerated ageing process representing 500 hours. Simultaneously, there was also examined the protective performance of pre-treatment with a UV radiation absorbent agent. The experimental results give evidence that in all cases, during accelerated ageing process, the influence of UV radiation on photo-degradation of the surface-treated spruce wood was significant. The tested lacquers, however, manifested diverse degrees of protective efficacy against UV radiation-induced effects to the wood surface in indoor conditions. The colour stability was found poorer for the surface treatment with lacquers without protective agents against UV radiation. The UV protective substance admixed into the coating material had an obvious decelerating effect on the photo-degradation in the surface-treated wood, but this degradation had not been inhibited absolutely. In all cases, the lightness decreased and the coordinates a* and b* increased. The result was that the treated wood surface attained yellow-brownish hue of various intensities. On the other hand, the gloss quality was preserved in all treatments.