Abstract
A laboratory method was used to evaluate the protective effect of 23 different paint systems on Norway spruce wood against decay fungi. Weather-o-meter treated and non-treated paint films on wood were tested. Results were compared to those obtained on unprotected spruce wood. Finishes included in the study were primer oils, solvent-borne alkyd paints, water-borne acrylic paints, water-borne mixed alkyd/acrylic paints, alkyd emulsions and stains in different paint system combinations with one to four coats. The growth of the decay fungi of the paint films was estimated by visual inspection. After 5 months of incubation, microbial activity in the wood below the paint films was evaluated. Growth of the fungi in the wood below the paint film was measured by an indirect chemical method for estimation of microbial activity. Paint systems including a solvent-borne alkyd coat usually had a good performance when tested without prior weathering but degenerated most during the weathering process as judged from the altered water absorption and fungal growth rate. Paint systems including a treatment with a primer oil exhibited low moisture uptake also after weathering. A clear effect of fungicide additions was also seen. A water-borne penetrating oil with an acrylic top coat exhibited no visual surface attack before weathering, and low microbial activity in wood for all decay fungi before and after weathering.
Zusammenfassung
Die Resistenz von 23 Oberflächenbehandlungen gegen Rotfäulepilze wurde vor und nach Bewitterung mit einer Laboratoriumsprüfmethode getestet. Die untersuchten Oberflächenbehandlungen waren: Grundierungsöl, Alkydanstrich in orgenischem Lösungsmittel. Acryl-Dispersion, Lasurfarben und gemischte Alkyd/Latex-Emulsionsfarben mit ein bis vier Schichten. Holzqualitätsfaktoren wurden auch mit einigen Oberflächenbehandlungen geprüft. Der Zuwachs der Fäulepilze auf den Oberflächenschichten wurde visuell geschätzt. Der Zuwachs im Holzmaterial unter den Anstrichschichten wurde mit einer chemischen Methode bestimmt. Die Wasserfarben haben die größte Durchlässigkeit für Wasser. Die Oberflächenbehandlungen mit einer konventionellen Alkydharzschicht weisen gute Eigenschaften vor der Bewitterung auf. Nach der Bewitterungsbehandlung hat sich die Durchlässigkeit für Wasser und der Zuwachs an Pilzen erhöht. Oberflächenbehandlungen mit einem Grundierungsöl zeigen gute Resistenz auch nach Bewitterung. Auch eine Ölemulsion mit einem Latexdeckanstrich beweist eine gute Resistenz gegen Rotfäulepilze und Wasseraufnahme vor und nach Bewitterung.
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Bjurman, J. The protective effect of 23 paint systems on wood against attack by decay fungi. Holz als Roh-und Werkstoff 50, 201–206 (1992). https://doi.org/10.1007/BF02663287
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DOI: https://doi.org/10.1007/BF02663287