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Evaluating the wettability of MUF resins and pMDI on two different OSB raw materials

Ermittlung der Benetzbarkeit von MUF Harz und pMDI auf zwei unterschiedlichen Rohstoffen für die OSB Produktion

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Abstract

In this paper, the wettability of two different wood species as raw material for Oriented Strand Board (OSB) is analyzed. One species is pine, a common material for the production of OSB; the other species, poplar, and especially hybrid poplar, is newly used in OSB and might require a modified board production process compared to pine. Therefore, strands of hybrid poplar obtained from a central European poplar plantation were compared to pine strands in terms of surface characteristics and contact angles after application of the adhesives. For the contact angle measurement droplets of two types of adhesives, melamine urea formaldehyde (MUF) resin and polymeric methylene diphenyl diisocyanate (pMDI), were applied onto the surface of the strands. pMDI exhibited larger contact angles on poplar than on pine; but for both wood species the contact angles were low when compared to MUF. MUF values were much higher, but relatively similar numbers were measured for both wood species.

Zusammenfassung

In dieser Arbeit wird die Benetzbarkeit von zwei unterschiedlichen Holzarten, welche als Rohstoffe für die Erzeugung von OSB in Frage kommen, untersucht. Zum einen wurde Kiefer, ein gängiges Rohmaterial für die Erzeugung von OSB, zum anderen Pappel, die speziell in Form von Hybridpappelholz zunehmend Verwendung in der OSB-Herstellung untersucht Pappel, die speziell in Form von Hybridpappelholz zunehmend Verwendung in der OSB-Herstellung findet. Zu diesem Zweck wurden im Rahmen dieser Arbeit OSB-Späne (Strands) einer zentraleuropäischen Pappelplantage mit Kieferspänen hinsichtlich Oberflächenenergie und Benetzungsverhalten verglichen. Für die Kontaktwinkelmessung wurden die Harze Melaminharnstoff Formaldehyd (MUF) und polymeres Diphenylmethandiisocyanat (pMDI) in Tropfenform auf die Späne aufgetragen und die Kontaktwinkel gemessen. Das pMDI-Harz zeigte größere Kontaktwinkel auf Pappel als auf Kiefer, jedoch waren die Kontaktwinkel auf beiden Holzarten gering im Vergleich zu jenen von MUF. Die mit MUF gemessenen Kontaktwinkel zeigten im Vergleich zu pMDI wesentlich höhere Werte mit geringen Unterschieden zwischen den beiden Holzarten.

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Authors and Affiliations

  1. Wood K plus, Competence Centre for Wood Composites and Wood Chemistry, Altenberger Straße 69, 4020, Linz, Austria

    Jörn Rathke

  2. Department of Material Sciences and Process Engineering, Institute of Physics and Material Sciences, BOKU, University of Natural Resources and Life Sciences, Peter Jordan Straße 82, T-1190, Vienna, Austria

    Gerhard Sinn

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  1. Jörn Rathke
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  2. Gerhard Sinn
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Correspondence to Jörn Rathke.

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Rathke, J., Sinn, G. Evaluating the wettability of MUF resins and pMDI on two different OSB raw materials. Eur. J. Wood Prod. 71, 335–342 (2013). https://doi.org/10.1007/s00107-013-0675-6

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  • DOI: https://doi.org/10.1007/s00107-013-0675-6

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