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Acid-Catalyzed Phenolic Bonding of Wood,
FOREST PRODUCTS LAB MADISON WI
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Strong acids could be used as catalysts for several wood adhesives, including some from renewable resources. In the past, however, strong acids were found to migrate from the cured glueline and attack and the wood nearby, thus destroying the joint. Because of the potential usefulness of acid-catalyzed adhesives, two concepts for potentially reducing the acid attack were tested Chemical entrapment of phenolic-like acids in the growing adhesive molecules, and physical entrapment of bulky acid molecules--including polymeric acids--within the cured resin matrix. The kinetics of these acid catalysts were determined and compared to resins containing standard catalysts. Other tests assessed the amount of acid that could be extracted and the durability of actual panels bonded with acid-cured gluelines. Present results indicate that acid migration has not been decreased by either of the two methods. Author
APPROVED FOR PUBLIC RELEASE