Abstract
The effects of hydroxymethylated resorcinol (HMR) on the tensile shear strength of wood joints treated with montan ester wax were studied with polyvinyl acetate (PVAc) and melamine formaldehyde (MF) adhesives. Untreated specimens which were bonded with MF and PVAc had similar bond strength properties under dry conditions, but MF bonded specimens’ tensile shear strength values were higher than that of PVAc glued specimens under wet conditions. With both adhesives tested, dry tensile shear strengths of wax-treated specimens were in a comparable range to those of untreated wood, while under wet conditions the strength values of wax-treated specimens were significantly lower than those of the controls.
HMR priming increased the shear strength of PVAc bonded specimens under wet conditions and of MF-bonded specimens under dry and wet conditions. The effect on MF-bonded specimens, however, was much more pronounced under wet conditions.
Zusammenfassung
Die Wirkung von hydroxymethyliertem Resorcin (HMR) auf die Scherzugfestigkeit von mit Montanesterwachs behandelten, verklebten Holzproben wurde anhand von Bindemitteln auf Polyvinylacetat- (PVAc) und Melamin-Formaldehyd-Basis (MF) untersucht. Unbehandelte, mit MF und PVAc verklebte Proben hatten unter trockenen Bedingungen ähnliche Bindefestigkeitseigenschaften, während die Scherzugfestigkeit der mit MF verklebten Proben bei nassen Bedingungen höher war als die der PVAc-verleimten Proben. Bei beiden untersuchten Klebstoffen lag die Trockenscherzugfestigkeit der wachsbehandelten Proben in einem ähnlichen Bereich wie die der unbehandelten Proben, während die Festigkeitswerte der wachsbehandelten Proben unter nassen Bedingungen signifikant niedriger waren als die der Kontrollen.
Die Grundierung mit HMR erhöhte die Scherfestigkeit der PVAc-gebundenen Proben im nassen Zustand und die der MF-gebundenen Proben sowohl unter trockenen als auch unter nassen Bedingungen. Die Wirkung auf die MF-gebundenen Proben war jedoch unter nassen Bedingungen sehr viel ausgeprägter.
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Kurt, R., Krause, A., Militz, H. et al. Hydroxymethylated resorcinol (HMR) priming agent for improved bondability of wax-treated wood . Holz Roh Werkst 66, 333–338 (2008). https://doi.org/10.1007/s00107-008-0265-1
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DOI: https://doi.org/10.1007/s00107-008-0265-1