Performance of Some Commercial Adhesives for Gluing Wood-Plastic Combinations

Nine hundred and sixty shear blocks of monomer-treated white pine and sugar maple were conditioned at 72?F. and 50 percent R. H. and glued with polyvinyl, urea formaldehyde, resorcinol-phenol, and casein adhesives. Experimental details are carefully outlined and results analyzed. In general the samples with low polymer loading had superior glue bond strength. The resorcinol-phenol type adhesive generally gave the best glue bonds. Polyvinyl acetate, urea formaldehyde, and casein will bond wood-plastic combinations but some formulation adjustments to match the moisture diffusion rate of the glue to the WPC are suggested to improve the adhesive bonding properties. Monomer systems used for the treatment were methyl methacrylate, vinyl acetate, and a 60-40 by weight solution of styrene and acrylonitrile.

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