1. Caffeine and TiO2 Nanoparticles Treatment of Spruce and Beech Wood for Increasing Transparent Coating Resistance against UV-Radiation and Mould Attacks
- Author
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Ondřej Schönfelder, Klára Kobetičová, Kristýna Šimůnková, Ondřej Dvořák, David Novák, Miloš Pánek, and Přemysl Šedivka
- Subjects
0106 biological sciences ,TiO2 nanoparticles ,Materials science ,02 engineering and technology ,engineering.material ,UV-resistance ,01 natural sciences ,Contact angle ,chemistry.chemical_compound ,Coating ,010608 biotechnology ,Materials Chemistry ,Composite material ,Beech ,caffeine ,Acrylate ,biology ,Tio2 nanoparticles ,transparent coatings ,Surfaces and Interfaces ,021001 nanoscience & nanotechnology ,biology.organism_classification ,mould attack ,Gloss (optics) ,Surfaces, Coatings and Films ,chemistry ,lcsh:TA1-2040 ,Service life ,engineering ,0210 nano-technology ,Caffeine ,lcsh:Engineering (General). Civil engineering (General) ,wood - 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.
- Published
- 2020