Caffeine and TiO2 Nanoparticles Treatment of Spruce and Beech Wood for Increasing Transparent Coating Resistance against UV-Radiation and Mould Attacks

Coatings

Klára Kobetičová¹  David Novák²  Ondřej Schönfelder²  Přemysl Šedivka²  Kristýna Šimůnková²  Miloš Pánek²  Ondřej Dvořák² 

[1] Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, 166 29 Prague, Czech Republic;Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 129, 165 00 Prague, Czech Republic;

关键词: wood;    caffeine;    TiO₂ nanoparticles;    transparent coatings;    UV-resistance;    mould attack;   

DOI  :  10.3390/coatings10121141

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown