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Environmentally friendly mixed tannin/lignin wood resins
Author(s) -
Lei Hong,
Pizzi A.,
Du Guanben
Publication year - 2007
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.27011
Subject(s) - formaldehyde , adhesive , lignin , tannin , glyoxal , phenol formaldehyde resin , environmentally friendly , phenol , synthetic resin , materials science , aldehyde , chemistry , organic chemistry , fiberboard , pulp and paper industry , composite material , food science , catalysis , ecology , layer (electronics) , engineering , biology
Abstract We obtained lignin‐based wood adhesives satisfying the requirements of relevant international standards for the manufacture of wood particleboard. These were based on two different low‐molecular‐mass lignins. These lignin‐based wood adhesives did not use any formaldehyde in their formulation; formaldehyde was substituted with a nonvolatile nontoxic aldehyde, namely, glyoxal. The last formaldehyde present, contributed by a fortifying synthetic phenol–formaldehyde resin, was also eliminated by the substitution of the phenol–formaldehyde resin with a natural, vegetable polyflavonoid tannin extract to which no aldehyde was added. This substitution brought the total content of natural material up to 80 wt % of the total adhesive. The adhesives yielded good internal bond strength results of the panels, enough to pass relevant international standard specifications for interior‐grade panels. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008