Abstract
Resins were prepared from resoles andPinus pinaster bark tannins by copolymerization at room temperature. Reducing the moisture content of the tannins to below 60% increased their stability, so allowing preparation of the resin before its application. Various formulations were tested, all of them substituting 50% of phenols by tannins. The resins obtained were used to manufacture 5-ply eucalyptus boards which met BS 1455: 1963 WBP quality standards.
Zusammenfassung
Durch Copolymerisation von Resolen und Rinden-Tannin ausPinus pinaster wurden verschiedene Harze hergestellt. Erniedrigung des Wassergehaltes auf unter 60% erhöht ihre Stabilität, so daß die Harze schon einige Zeit vor der Anwendung hergestellt werden konnten. Verschiedene Zusammensetzungen, wobei jeweils 50% des Phenols durch Tannin ersetzt war, wurden getestet. Mit den so erhaltenen Harzen wurden fünfschichtige Sperrholzplatten aus Eucalyptus verleimt. Die Platten genügten den Anforderungen des Standards BS 1455: 1963 WBP
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This study was subsidised by the Xunta de Galicia. The authors wish to express their gratitude to FORESA for technical assistance.
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Vázquez, G., Antorrena, G., Francisco, J.L. et al. Properties of phenolic-tannin adhesives from pinus pinaster bark extracts as related to bond quality in eucalyptus plywoods. Holz als Roh-und Werkstoff 50, 253–256 (1992). https://doi.org/10.1007/BF02650319
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DOI: https://doi.org/10.1007/BF02650319