Casein-Dialdehyde Starch Adhesives for Wood

Formulations of casein with the non-volatile polyaldehyde dialdehyde starch (DAS), were evaluated as wood adhesives. Factors studies included the use of dry or solubilized DAS in adhesive formulations, ratio of casein to DAS, and pH of adhesive mixture. Adhesive formulations prepared under acidic conditions with solubilized DAS and applied to yellow birch panels set within 5 minutes under cold-press with development of good dry strength. The plywood showed maximum shear strength at approximately 20 percent moisture content following exposure at 77?F. Original dry shear strength and wet strength following 48 hours continuous soaking in cold water surpassed reported commercial casein-glue bond values. The casein-DAS bond also resisted delamination in boiling water. Glue lines of yellow birch plywood bonded with casein-DAS adhesive were hard and inconspicuous, and the panels were free from stain.

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