Process for the partial substitution of ammonium lignosulfonate for phenol in phenolic-aldehyde resin adhesives

摘要

A process for making a phenol-aldehyde resin adhesive is disclosed in which a portion of the phenol ingredient is replaced with ammonium lignosulfonate. Solid ammonia base waste sulfite liquor residue is dissolved or suspended in phenol and the mixture is heated to a temperature range of 150°-300° C under autogenous pressure until the resulting phenol-ammonium lignosulfonate component of the reaction mass is water insoluble but soluble in aqueous sodium hydroxide. The reaction mass may be washed with water to remove soluble wood sugars and their derivatives. The phenol-ammonium lignosulfonate component may then be condensed with an aldehyde resulting in a resin product that is useful as an exterior adhesive, having suitable water insolubility and adhesive characteristics. The ratio of ammonium lignosulfonate to phenol may range from 2:1 to 1:10, depending upon the desired properties of the finished adhesive.