Natural Tannins for Cold-Setting Wood Adhesives

  • Antonio Pizzi

Abstract

Flavonoid tannins, from the bark and wood of trees such as Acacia mearnsii and Pinus radiata, being phenolic in nature, undergo the same well-known reaction of phenols with formaldehyde either base- or acid- catalysed, weakly basic base-catalysed reactions being predominantly used in industrial applications. Increasingly alkaline conditions lead to progressive activation of the phenol as nucleophile, especially above pH 8 where phenate ions are formed.

Keywords

Formaldehyde Hydrolysis Phenol Hydroxyl Aldehyde 

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Antonio Pizzi
    • 1
  1. 1.National Timber Research InstituteCSIRPretoriaSouth Africa

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