Abstract
The effect of the initial modification of beech and spruce wood using a solution of caffeine and of a commercial product FN-NANO® FN-1 containing a water dispersion of TiO2 nanoparticles for increasing the service life of a transparent oil and acrylate coatings during 6 weeks of artificial accelerated weathering was tested. Changes in colour, gloss, and the contact angle of water were monitored. Degradation of the coating film was also evaluated visually and microscopically. The resistance of the coatings to mould growth was also subsequently tested. Based on the results, it is possible to recommend the initial treatment of spruce and beech wood with a 2% caffeine solution or 15% solution of FN-NANO® dispersion to increase the overall life of a transparent acrylic coating in exterior applications. No positive effect of the applied treatments was observed with the oil coating. In addition, lower concentrations of FN-NANO® did not have a sufficient effect, and the synergistic effect of using FN-NANO® in a mixture with a 1% caffeine solution was also not confirmed.
Highlights
Wood is a material of natural origin which is subject to a relatively rapid loss of its original appearance in exterior applications [1]
Ultraviolet (UV) stabilisers, hindered amine light stabilisers (HALS), and nanoparticles [1,2,3,4,5,6,7,8,9,10,11,12,13] are most often used as additives, and substances based on triazoles, carbamates, and others are most often used as fungicides [14,15]
Based on visual evaluation supplemented by a microscopic analysis of the surfaces of the tested samples after artificial accelerated aging, positive effect of certain types of pre-treatments improving the durability of the acrylate coating (Figure 1) were evident
Summary
Wood is a material of natural origin which is subject to a relatively rapid loss of its original appearance in exterior applications [1]. Transparent coatings can preserve the original design and partly the colour of the base wood; their long-term stability is reduced compared to pigmented coatings by deeper and more intense penetration of sunlight into the coating film and base wood [6,7]. Another factor causing faster defoliation of coatings is the growth of fungal hyphae on their surface and in the zone between the coating and the wood surface [8,9]. Ultraviolet (UV) stabilisers, hindered amine light stabilisers (HALS), and nanoparticles [1,2,3,4,5,6,7,8,9,10,11,12,13] are most often used as additives, and substances based on triazoles, carbamates, and others are most often used as fungicides [14,15]
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