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Weathering of uncoated and coated wood treated with methylated 1,3-dimethylol-4,5-dihydroxyethyleneurea (mDMDHEU)

Bewitterung von unbeschichtetem und beschichtetem Holz behandelt mit methyliertem 1,3-Dimethylol-4,5-dihydroxyethylenharnstoff (mDMDHEU)

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Abstract

Scots pine (Pinus silvestris L.) sapwood panels were treated with a methylated 1,3-dimethylol-4,5-dihydroxyethyleneurea (mDMDHEU) causing weight gains of approx. 25% and were exposed to weathering for 18 months. Compared to untreated panels, treatment with mDMDHEUreduced surface discoloration mainly caused by staining fungi. Panels treated with mDMDHEU clearly exhibited lower moisture content throughout the exposure time and lower water uptake in periodical submersion tests. The treatment also reduced deformation (cupping) and crack formation of the panels due to weathering (assessed as waviness and surface roughness).

When coated panels were compared, a pre-treatment with mDMDHEU resulted in lower water uptake in periodical submersion tests, less discoloration, minor deformation (cupping) and less crack formation (assessed as waviness and surface roughness). Oil-based coatings did not peel off the mDMDHEU treated panel surfaces as observed for the untreated panel surfaces.

Zusammenfassung

Kiefersplintholzbretter (Pinus silvestris L.) wurden mit einem methylierten 1,3-Dimethylol-4,5-dihydroxyethylenharnstoff (mDMDHEU) behandelt, wobei sich eine Gewichtszunahme von etwa 25% ergab. Die Bretter wurden über 18 Monate der Bewitterung ausgesetzt. Im Vergleich zu unbehandelten Brettern führte eine Behandlung mit mDMDHEU zu einer Verminderung der von Pilzen verursachten Oberflächenverfärbung. Bretter, die mit mDMDHEU behandelt wurden, zeigten über den gesamten Bewitterungszeitraum hinweg deutlich niedrigere Feuchten und niedrigere Wasseraufnahmen bei periodisch durchgeführten Tauchtests. Die Behandlung reduzierte außerdem die Verformung (Schüsseln) und die Rissbildung der Bretter infolge der Bewitterung (gemessen als Welligkeit und Oberflächenrauhigkeit).

Bei beschichteten Brettern ergab die Vorbehandlung mit mDMDHEU eine geringere Wasseraufnahme bei periodisch durchgeführten Tauchtests, eine geringere Verfärbung, weniger Verformung (Schüsseln) und eine geringere Rissbildung (gemessen als Welligkeit und Oberflächenrauhigkeit). Bei ölbasierenden Beschichtungen kam es bei den DMDHEUbehandeltenBrettern nicht zum Abblättern wie dies auf den Oberflächen der unbehandelten Bretter zu beobachten war.

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Correspondence to Carsten Mai.

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Xie, Y., Krause, A., Militz, H. et al. Weathering of uncoated and coated wood treated with methylated 1,3-dimethylol-4,5-dihydroxyethyleneurea (mDMDHEU) . Holz Roh Werkst 66, 455–464 (2008). https://doi.org/10.1007/s00107-008-0270-4

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