Cornstarch and tannin in phenol–formaldehyde resins for plywood production

Published Date
September 2009, Vol.30(2):188–193, doi:10.1016/j.indcrop.2009.03.005

Author 

Amine Moubarik ^a,c,,

Antonio Pizzi ^b

Ahmed Allal ^c

Fatima Charrier ^a

Bertrand Charrier ^a

• aSylvadour, IUT des Pays de l’Adour, Mont de Marsan, France
• bENSTIB, Université de Nancy 1, Epinal, France
• cIPREM-EPCP (UMR 5254), Université de Pau et des Pays de l’Adour, 2, avenue Pierre Angot, 64053 Pau cedex 9, France

Received 31 October 2008. Revised 9 March 2009. Accepted 9 March 2009. Available online 17 April 2009.

Abstract

The aim of this work is to demonstrate the performances of cornstarch–quebracho tannin-based resins designed as adhesive in the plywood production. In this way, the cornstarch and quebracho tannin was introduced in the classic adhesive formulation in order to supply a part of phenol–formaldehyde (PF). The physical properties (rheological characterization, thermogravimetric analysis and solid phase ¹³C NMR analysis) of the formulated resins were measured. In order to evaluate the mechanical performances of optimal cornstarch–quebracho tannin-based resins, plywood panels were produced and mechanical properties were investigated. These mechanical properties included tensile strength, wood failure and 3-point bending strength. The performance of these panels is comparable to those of plywood panels commercial PF made.

The results showed that plywood panels bonded with cornstarch–quebracho tannin–PF resins (15:5:80, w/w/w) exhibited better mechanical properties than plywood panels commercial PF made. The introduction of small proportions of cornstarch and quebracho tannin in PF resins contributes to the improvement of the boiling water performance of these adhesives. The formaldehyde emission levels obtained from panels bonded with cornstarch–quebracho tannin–PF were lower to those obtained from panels bonded with control PF. Solid state CPMAS NMR spectra indicates that no reaction at all between PF resins and cornstarch and quebracho tannin. Even when reaction does evidently not occur, the addition of cornstarch and quebracho tannin improves markedly the water resistance of PF resins.

Keywords

Cornstarch

Quebracho tannin

Phenol formaldehyde

Plywood

Wood adhesive

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  Corresponding author at: Laboratoire Sylvadour, IUT des Pays de l’Adour, 371 rue du Ruisseau, BP 201, 40004 Mont de Marsan, France. Fax: +33 5 58 51 37 37.

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