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Wood–phenol adhesives prepared from carboxymethylated wood. I
Author(s) -
Shiraishi Nobuo,
Kishi Hajime
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320124
Subject(s) - adhesive , solvolysis , dissolution , phenol , carboxymethyl cellulose , aqueous solution , materials science , formaldehyde , adhesion , dissolving pulp , wet strength , cellulose , hydrolysis , composite material , chemical engineering , chemistry , organic chemistry , ultimate tensile strength , layer (electronics) , engineering , sodium
Preparation of carboxymethylated wood (CM wood)–phenol resin adhesives has been attempted by two methods, “kneading method” and “solvolysis method,” and their adhesion strength has been studied. The two preparation methods differ in the dissolution step. In the case of the kneading method, CM wood was dissolved in aqueous phenol by kneading at 100–120°C under shear, whereas, in the case of the solvolysis method, the dissolution was facilitated by phenolysis at 80°C in the presence of appropriate amounts of hydrochloric acid. The wood‐based adhesive prepared by the solvolysis method revealed excellent and enhanced applicability compared with that of the adhesive prepared by the kneading method, although the latter can be used as an adhesive for wood. Adhesion strength of these adhesives was enhanced when poorly substituted CM wood and appropriate amounts of formaldehyde were used in the resin preparation. A crosslinking agent for carboxymethyl cellulose, that is, polymeric MDI, was also added just before application. The water‐proof adhesion strength was higher than the JIS specification for phenol resin adhesives for this modification.