Abstract
Outdoor and artificial weathering tests were performed on specimens of Scots pine sapwood treated with silanes to achieve water repellent properties. During outdoor weathering, the treatment caused a reduction in (liquid) water uptake but the sorption of moisture (air humidity) was not affected by silane treatment. The water repellent effect of vacuum-pressure treated specimens remained stable over the tested exposure period of one year, as was shown in dipping tests.
Evaluation of silane treated specimens did not reveal any reduction of crack formation during exposure to weathering. The application of silanes in combination with UV light stabilizers enhanced the effectiveness of these protectants and led to higher colour stability during artificial weathering in a QUV device.
Zusammenfassung
Zur Erlangung Wasser abweisender Eigenschaften wurden Kiefernsplintholzproben mit Silanen behandelt und einer natürlichen und künstlichen Bewitterung ausgesetzt. Die Behandlungen bewirkten eine verringerte Aufnahme von (flüssigem) Wasser bei der Außenbewitterung; jedoch wurde die Feuchtesorption (durch Interaktion mit der Luftfeuchte) nicht beeinflusst. Im Laufe der Bewitterungszeit von einem Jahr erwies sich der Wasser abweisende Effekt bei Vakuum-Druck-behandelten Proben in Tauchversuchen als stabil. Es wurde kein Einfluss auf die Bildung von Oberflächenrissen während der Bewitterung festgestellt. Die Kombination von Silanen mit UV-Stabilisatoren verstärkte die Wirkung dieser Mittel und führte zu verbesserter Farbstabilität bei künstlicher Bewitterung.
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Donath, S., Militz, H. & Mai, C. Weathering of silane treated wood . Holz Roh Werkst 65, 35–42 (2007). https://doi.org/10.1007/s00107-006-0131-y
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DOI: https://doi.org/10.1007/s00107-006-0131-y