Hydrolytic Effects of An Acid-Phenolic Molding Resin on Southern Pine, Red Oak, and Douglas-Fir

A single-stage phenolic molding resin has been found which develops strong and waterproof bonds on wood. It cures with radio-frequency energy without arcing, and could be used for high-speed laminating, finger-jointing, and edge-bonding of wood products. An acid catalyst is used in the cure. Since woods hydrolyze in the presence of strong acids, this study determined what effects this acid had on the strengths of bonds to southern pine, red oak, and Douglas-fir. Accelerated moist-heat aging tests revealed that the phenolic resin could develop highly durable bonds equivalent to phenol-resorcinol-formaldehyde adhesive on southern pine and Douglas-fir. However, susceptibility of red oak to acid hydrolysis appeared to make the acid phenolic riskier to use. Heat-aging in a moist atmosphere proved effective in detecting the effects of acid concentration on the rates of hydrolysis of individual species of wood.

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