Southern Pine Wood and Strands Impregnated with Low Levels of Butanetetracarboxylic Acid as Stabilizing Agent for Oriented Strandboard
Keywords:Butanetetracarboxylic acid, acid wood stabilization, dimensionally stable oriented strandboard
AbstractSouthern pine wood specimens were impregnated with butanetetracarboxylic (BTCA) acid at 1.0-5.0% levels using a vacuum/pressure method and hot-pressing at 150°-210°C in the radial direction. The acid treatments gave anti-swelling efficiency (ASE) values up to 57% in an exhaustive first water-soak cycle. The ASE values were higher in the radial than tangential direction, and higher for irreversible than reversible components. Laboratory strandboards made with wood strands impregnated with 0.5°-1.0% BTCA levels under vacuum showed ASE values of up to 53%, but internal bond and modulus of elasticity and rupture values decreased somewhat excessively. The strength values of boards were modest, higher than the minimum industry requirements for commodity-type oriented strandboard. The various effects of BTCA on wood and board properties were discussed. Use of BTCA at less than 0.5% level and optimization of hot-pressing and resin binder and wax levels may result in a method of manufacturing oriented strandboard with significantly improved dimensional stability.
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