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The formulation and commercialization of glulam pine tannin adhesives in Chile

Produktion und Vertrieb von Klebstoffen aus Kieferntannin für den Holzleimbau in Chile

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Abstract

The results of fingerjointing and glulam industrial trials in Chile using a “honeymoon” fast-set adhesive system manufactured using commercially-produced mildly-sulphited pine tannin extract are reported. The results obtained satisfy the relevant international standards specifications and constitute the first occasion that a commercially produced pine tannin adhesive has been used succesfully in industrial productions runs. This pine tannin adhesive is now available commercially in Chile for fully-exterior, structural-grade, solid timber applications. A new “honeymoon” type adhesive formulation had to be developed due to the peculiar gelling of the pine tannin extract used.

The Chilean pine tannin extracted from a mixture of Pinus insignis and Pinus radiata shows gel times longer than what reported for other conifer tannins with the exception of Pinus brutia. Such differences in curing rate are tentatively reported to be related to the relative branching of the different conifer tannins.

Zusammenfassung

Keilzinkverbindungen und Leimbinder wurden in einem Industrieversuch in Chile mit einem neuen schnellhärtenden Kleber (“Honeymoon”) hergestellt. Der Kiebstoff wurde aus einem kommerziellen, leicht sulphoniertem Kieferntannin hergestellt. Die erzielten Ergebnisse genügen den einschlägigen internationalen Standards. Dies ist das erste Mal, daß ein Klebstoff aus einem handelsüblichen Tanninextrakt erfolgreich unter industriellen Bedingungen getestet wurde. Dieser Klebstoff aus Kieferntannin wird jetzt in Chile für Außenanwendungen im Holz- und Holzleimbau verkauft. Hierzu mußte eine neue “Honeymoon”-Rezeptur entwickelt werden wegen der kritischen Gelierzeiten des verwendeten Kieferntannin-Extraktes. Die Gelierzeiten dieses Tannins aus einem Gemisch von Pinus insignis und Pinus radiata waren länger als die bisher von anderen Koniferen-Tanninen bekannten Zeiten mit Ausnahme des Tannins von Pinus brutia. Diese Unterschiede werden vorläufig mit unterschiedlichen Verzweigungsgraden der einzelnen Tannine erklärt.

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Authors and Affiliations

  1. Diteco Ltda., Concepcion, Chile

    E. von Leyser

  2. CSIR, Pretoria, South Africa

    A. Pizzi

Authors
  1. E. von Leyser
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  2. A. Pizzi
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von Leyser, E., Pizzi, A. The formulation and commercialization of glulam pine tannin adhesives in Chile. Holz als Roh-und Werkstoff 48, 25–29 (1990). https://doi.org/10.1007/BF02607848

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  • DOI: https://doi.org/10.1007/BF02607848

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