The chemistry and development of tannin‐based weather‐ and boil‐proof cold‐setting and fast‐setting adhesives for wood

摘要

AbstractCondensed tannins, being phenolic in nature, can be chemically modified to undergo reaction with formaldehyde in such a way that the adhesives formed harden at ambient temperature in industrially meaningful times. Resorcinol,m‐hydroxyaniline, and their condensation products with formaldehyde and/or tannin resoles have been used for this purpose. The optimum conditions of application, such as paraformaldehyde amount, pH, and open and close assembly times, were used when comparing the different resins prepared. Results satisfying the requirements of international standard specifications and comparable to those of phenol/resorcinol/formaldehyde cold‐setting resins were obtai