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DSC application for characterization of Urea/formaldehyde condensates

DSC-Anwendung zur Charakterisierung von UF Harzen

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Abstract

Curing process was investigated for a variety of urea/formaldehyde (UF) resin adhesives suitable for particle boards and/or plywoods using DSC in anisothermal mode. In spite of the very different origins of the adhesives (both commercial and laboratory made) several common features in their thermal behaviour are noticed. The maximum curing reaction rate was detected in the range of 80–85°C. Elimination of formaldehyde was observed at 105–150°C. At temperatures higher than 150°C thermal decomposition of methylene linkage takes place which affects the mechanical properties of the adhesives. According to our results a good compromise can be found between product quality and curing rate (production efficiency) on the one hand, and environmental protection (low formaldehyd emission) on the other.

Zusammenfassung

Der Aushärtungsprozeß verschiedener UF-Harze für Spanplatten und Sperrholz wurde mit Hilfe der anisothermen DSC untersucht. Trotz der äußerst unterschiedlichen Herkunft der kommerziellen und im Labor synthetisierten Harze konnten ähnliche Reaktionen auf die thermische Behandlung festgestellt werden. Die maximale Aushärtungsreaktion lag zwischen 80 und 85°C. Freisetzung von Formaldehyd wurde zwischen 105 und 150°C beobachtet. Über 150°C zerfallen Methylenbindungen, wodurch die mechanischen Eigenschaften der Harze beeinträchtigt werden. Es läßt sich ein guter Kompromiß finden zwischen Produktqualität und Aushärtezeit (Produktivität) auf der einen Seite und Umweltschutz (geringe Formaldehydemission) auf der anderen.

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Authors and Affiliations

  1. Central Research Institute for Chemistry, Hungarian Academy of Sciences, POB 17, H-1525, Budapest, Hungary

    M. Szesztay & Z. László-Hedvig

  2. United Chemical Works, Ujhegyi ut 3, H-1108, Budapest, Hungary

    E. Kovacsovics

  3. Dept. Chemical Technology, Eötvös Loránd University, POB 32, H-1518, Budapest 112, Hungary

    F. Tüdős

Authors
  1. M. Szesztay
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  2. Z. László-Hedvig
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  3. E. Kovacsovics
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  4. F. Tüdős
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Szesztay, M., László-Hedvig, Z., Kovacsovics, E. et al. DSC application for characterization of Urea/formaldehyde condensates. Holz als Roh-und Werkstoff 51, 297–300 (1993). https://doi.org/10.1007/BF02663798

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  • DOI: https://doi.org/10.1007/BF02663798

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