Diisocyanate/furfural adhesive for bonding plywood

Plywoods made from southern pine, a major structural species, and from yellow-poplar, a major decorative species, were bonded with polymeric methyl diphenyl diisocyanate adhesives. Furfural was used as a binder diluent to reduce the adhesive costs. These nonformaldehyde-adhesive-bonded plywoods were evaluated by accelerated-aging tests for exterior and interior durability. Extenders and fillers were added to the adhesives to help maintain the adhesive spread on the gluelines. The three diisocyanate-furfural adhesives used in this study to bond southern pine and yellow-poplar plywoods exhibited no delamination after accelerated-aging tests. Most bondline wood failures did not meet exterior requirements of Product Standard PS 1-83 (12) for structural plywoods, but they did approach or exceed requirements for Technical and Type I exterior type plywood per ANSI/HPMA HP-1983 (1) standard for decorative and hardwood plywood.

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