Wattle-Base Adhesives for Exterior Grade Particleboards

Different types of wattle-based adhesives were used to produce particleboards of exterior grade quality. Reduction of the viscosity of wattle extract was achieved by acid and subsequent alkaline hydrolysis of its high molecular weight gums and the use of aromatic hydrogen bond-breakers. The improvements achieved by treating wattle-base adhesives with organic anhydrides are discussed. Hydrolysis of the high molecular weight gums to sugars improved strength and water resistance of wattle-base adhesive boards. Improved strength was also obtained by increasing cross-linking of tannin/formaldehyde adhesives with a small amount of PF resin. No detrimental effects on the water resistance of the adhesive was observed. A similar result was obtained by fortifying tannin/formaldehyde adhesives with a simple phenol/resorcinol/formaldehyde resin.

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