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Holz als Roh- und Werkstoff

, 65:35 | Cite as

Weathering of silane treated wood

  • S. Donath
  • H. Militz
  • C. MaiEmail author
ORIGINALARBEITEN ORIGINALS

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.

Keywords

Lignin Wood Surface Water Repellent Hinder Amine Light Stabilizer Weight Percent Gain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Bewitterung von mit Silanen behandeltem Holz

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.

References

  1. 1.
    Brinker CF, Scherer GW (1990) Sol-Gel-Science. Academic Press, San DiegoGoogle Scholar
  2. 2.
    Donath S, Militz H, Mai C (2004) Wood modification with alkoxysilanes. Wood Sci Technol 38:555–566CrossRefGoogle Scholar
  3. 3.
    Donath S, Militz H, Mai C (2005) Creating water repellent effects on wood by treatment with silanes. Holzforschung 60:40–46CrossRefGoogle Scholar
  4. 4.
    Evans PD, Donnelly C, Cunningham RB (2003) Checking of CCA-treated radiata pine decking timber exposed to natural weathering. For Prod J 53(4):66–71Google Scholar
  5. 5.
    Feist WC, Hon DN-S (1984) Chemistry of weathering and protection. In: Rowell R (ed) The chemistry of solid wood. Advances in Chemistry Series No. 207. American Chemical Society, , pp 401–451Google Scholar
  6. 6.
    Hon DN-S (2001) Weathering and photochemistry of wood. In: Hon DN-S, Shiraishi N (eds) Wood and cellulosic chemistry. Marcel Dekker, New York, pp 513–546Google Scholar
  7. 7.
    Hon DN-S, Feist WC (1992) Hydroperoxidation in photoirradiated wood surfaces. Wood Fiber Sci 24:448-455Google Scholar
  8. 8.
    Hon DN-S, Minemura N (2001) Color and discoloration. In: Hon DN-S, Shiraishi N (eds) Wood and cellulosic chemistry. Marcel Dekker, New York, pp 385–442Google Scholar
  9. 9.
    Kabir FR, Nicholas DD, Vasishth RC, Barnes HM (1992) Laboratory methods to predict the weathering characteristics of wood. Holzforschung 46:395–401CrossRefGoogle Scholar
  10. 10.
    Kamdem DP, Grelier S (2002) Surface roughness and color change of copper amine and UV absorber-treated red maple (Acer rubrum) exposed to artificial ultraviolet light. Holzforschung 56:473–478CrossRefGoogle Scholar
  11. 11.
    Mai C, Militz H (2004a) Modification of wood with silicon compounds. Inorganic silicon compounds and sol-gel systems: a review. Wood Sci Technol 37:339–348CrossRefGoogle Scholar
  12. 12.
    Mai C, Militz H (2004b) Modification of wood with silicon compounds. Treatment systems based on organic silicon compounds – a review. Wood Sci Technol 37:453–461CrossRefGoogle Scholar
  13. 13.
    Müller U, Steiner M, Rätzsch M (2002) Photostabilization of wood without topcoat- influence of UV-absorber and radical scavenger. In: Proceedings of the international symposium on wood based materials, 19–20 September 2002, ViennaGoogle Scholar
  14. 14.
    Rowell R, Banks B (1985) Water repellency and dimensional stability of wood. United States Department of Agriculture, Technical Report FPL 50Google Scholar
  15. 15.
    Saka S, Miyafuji H, Tanno F (2001) Wood-inorganic composites prepared by the sol-gel process. J Sol-Gel Sci Technol 20:213–217CrossRefGoogle Scholar
  16. 16.
    Saka S, Tanno F (1996) Wood-Inorganic Composites Prepared by Sol-Gel Processing VI. Effects of a property-enhancer on fire-resistance in SiO2-P2O5 and SiO2-B2O3 wood-inorganic composites. Mokuzai Gakkaishi 42:81–86Google Scholar
  17. 17.
    Saka S, Ueno T (1997) Several SiO2 wood-inorganic composites and their fire-resisting properties. Wood Sci Technol 31:457–466Google Scholar
  18. 18.
    Schulte Y, Donath S, Krause A, Militz H (2004) Evaluation of outdoor weathering performance of modified wood. IRG-Document IRG/WP/0420296, StockholmGoogle Scholar
  19. 19.
    Tanno F, Saka S, Yamamoto A, Takabe K (1998) Antimicrobial TMSAH-added wood-inorganic composites prepared by sol-gel process. Holzforschung 52:365–370CrossRefGoogle Scholar
  20. 20.
    Treu A, Militz H, Habicht J, Klaucke R (2003) Kombinationsverfahren von bioziden Holzschutzmitteln und Hydrophobierungsmitteln. Proceedings of the 23. Holzschutztagung der DGFH, Augsburg, Germany, 26.–27. March 2003Google Scholar
  21. 21.
    Tshabalala MA, Gangstad JE (2003) Accelerated weathering of wood surfaces coated with multifunktional alkoxysilanes by sol-gel deposition. J Coat Technol 75:37–42Google Scholar
  22. 22.
    Tshabalala MA, Kingshott P, VanLandingham MR, Plackett D (2003) Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol-gel process. J Appl Polym Sci 88:2828–2841CrossRefGoogle Scholar
  23. 23.
    Williams RS, Feist WC (1999) Water repellents and water-repellent preservatives for wood. United States Department of Agriculture. Technical Report FPL-GTR-109Google Scholar
  24. 24.
    Zahora A (1991) Interactions between water-borne preservatives and emulsion additives that influence the water repellency of wood. IRG-Document IRG/WP/2374, StockholmGoogle Scholar
  25. 25.
    Zahora A (1992) A water repellent additive’s influence on field performance of southern yellow pine lumber. Proceedings of the Annual Meeting of American Wood-Preservers’ Association 88, pp 148-159Google Scholar
  26. 26.
    Zahora A (2000) Long-term performance of a “wax” type additive for use with water-borne pressure preservative treatments. IRG-Document IRG/WP/00-40159, StockholmGoogle Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Institute of Wood Biology and TechnologyUniversity of GöttingenGöttingenGermany

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