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Wetting of soy protein adhesives modified by urea on wood surfaces

Benetzung von Holzoberflächen mit Harnstoff modifizierten Sojaproteinklebstoffen

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Abstract

Wetting of soy protein adhesives modified by urea on wood surfaces was investigated with sessile liquid droplet method. Dynamic contact angles were used to illustrate the wetting process. The effects of wood surface roughness and urea concentration on contact angles were investigated. Moreover, two wetting models were used to describe the dynamic contact angle process, in which the contact angle change rate constant (K) can be used to quantify the adhesive spreading and penetration during the wetting process. The results showed that the wetting models could accurately describe the dynamic wetting process of soy protein adhesives on wood surfaces.

Zusammenfassung

Der Auftrag von mit Harnstoff modifiziertem Sojaproteinklebstoff auf Holzoberflächen wurde mit dem Verfahren des „ruhenden Tropfens“ (Sessile-Drop-Verfahren) untersucht. Der Benetzungsverlauf wurde mittels dynamischer Kontaktwinkelmessung aufgezeigt. Die Einflüsse der Oberflächenrauhigkeit des Holzes sowie der Harnstoffkonzentration auf die Kontaktwinkel wurden untersucht. Anhand zweier Benetzungsmodelle wurde der dynamische Kontaktwinkelverlauf beschrieben, wobei die Konstante (K) der Funktion der Kontaktwinkeländerung zur Bestimmung der Klebstoffverteilung und der Eindringung in das Holz während der Benetzung verwendet wird. Die Ergebnisse zeigten, dass mit den Benetzungsmodellen der dynamische Benetzungsprozess von Sojaproteinklebstoff auf Holzoberflächen zutreffend dargestellt werden kann.

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Acknowledgements

The study was financed by the International Cooperation Fund from Zhejiang Science and Technology Department (No. 2010C34007).

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Authors and Affiliations

  1. State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, 214122, China

    Hua-Neng Xu & Qiu-Yun Shen

  2. School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan, 316004, China

    Xiao-Kun Ouyang & Li-Ye Yang

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  1. Hua-Neng Xu
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  2. Qiu-Yun Shen
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  3. Xiao-Kun Ouyang
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  4. Li-Ye Yang
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Correspondence to Hua-Neng Xu.

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Xu, HN., Shen, QY., Ouyang, XK. et al. Wetting of soy protein adhesives modified by urea on wood surfaces. Eur. J. Wood Prod. 70, 11–16 (2012). https://doi.org/10.1007/s00107-010-0502-2

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  • DOI: https://doi.org/10.1007/s00107-010-0502-2

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