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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Literature
Ayla C. 1984: Pinus brutia Tannin Adhesives, in Wood Adhesives: Present and Future (Ed. A. Pizzi), J. Appl. Polym. Sci, Applied Polymer Symposium Nr. 40:69–78
ASTM, American standard test methods specification for structural laminated wood products for use under exterior (wet use) exposure conditions, 1972: ASTM D2559-72 (AITC 107 and 110)
Baeza, J. 1989: Personal communication, Concepcion, Chile.
Diteco Ltda.; Baeza J. 1989: Personal communication. Concepcion, Chile
Gollob, L. 1989: The correlation between preparation and properties in phenolic resins, in Wood Adhesives Chemistry and Technology, Vol 2 (Ed. A. Pizzi), Marcel Dekker Inc, New York, 121–154
Hergert, H.L. 1989: Condensed tannins in Adhesives: Introduction and Hystorical Perspective, Chapter 12, in Adhesives from Renewable Resources (Eds. R.W. Hemingway and A.H. Conner), ACS symposium series Nr. 385, 155–171
Pizzi, A. 1979: Sulphited Tannins for Exterior Wood Adhesives. Colloid and Polym. Sci. 257:37–40
Pizzi, A. 1989: Research vs. Industrial Practice with Tannin-based Adhesive, Chapter 19, in Adhesives from Renewable Resources (Eds. R.W. Hemingway and A.H. Conner), ACS symposium series Nr. 385, 254–267
Pizzi, A.; Cameron, F.A. 1984: Fast-set Adhesives for Glulam. Forest Prod. J. 34:61–68
Pizzi, A.; Rossouw, D. du T.; Knuffel, W. E.; Singmin, M. 1980: “Honeymoon” Phenolic and Tannin—based Fast—setting Adhesive Systems for Exterior—grade Fingerjoints. Holzforsch Holzverwert. 32(6):140–150
Rossonw, D. du T.; Schrocder, H. 1976: unpublished work, Pretoria, South Africa
Scharfetter, H.; Pizzi, A.; Rossouw, D. du T. 1977: Some new ideas on tannin adhesives for wood, paper presented at the IUFRO Wood glueing working party S5.04–07. Merida. Venezuelar:1 16
South African Bureau of Standards specification for the manufacture of fingerjointed structural timber, 1976: SABS 096-1976:1–18
South African Bureau of Standards specification for laminated timber (glulam): SABS 1460–1988:1–30 and SABS 876–1976:1–30
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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