Pine tannin based adhesive mixes for plywood

Abstract Pine tannin extract has never been used before as an adhesive for plywood. Interior and exterior grade plywood panels were prepared based on various adhesive formulations with pine tannin extract on both, hardwood and softwood veneers. The best performing formulations appeared to be those in which the pine tannin was added in a proportion of 20–35% to a phenol formaldehyde or a urea formaldehyde resin or to pMDI (4,4′-methylene diphenyl diisocyanate). Mixed adhesive formulations where a small amount of pMDI was added on top of 20% synthetic formaldehyde resin gave plywood with even better performance but with shorter pot life of the adhesive mix.

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