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Organosolv wheat straw lignin as a phenol substitute for green phenolic resins

Tachon, Nadine and Benjelloun-Mlayah, Bouchra and Delmas, Michel Organosolv wheat straw lignin as a phenol substitute for green phenolic resins. (2016) BioResources, 11 (3). 5797-5815. ISSN 1930-2126

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Official URL: https://doi.org/10.15376/biores.11.3.5797-5815

Abstract

Organosolv wheat straw lignin extracted using the CIMV processTM is a linear, low molecular weight, and natural phenolic oligomer. In this study, organosolv wheat straw lignin was tested as a substitute for 50% to 70% of the phenol in a phenol-formaldehyde-resol resin. The lignin was used without any chemical modification in a one-step synthesis reaction. Parameters such as reaction time and formaldehyde-to-phenol sources (phenol + lignin) mass ratios were optimized to achieve the requirements for industrial wood adhesives in terms of pH, viscosity, and dry matter. For the first time, the formaldehyde ratio was studied in order to reduce resin residual free formaldehyde below 1%. Lignin-phenol-formaldehyde resins were successfully synthesized up to a phenol substitution rate of 70% and showed physico-chemical properties close to standard phenol-formaldehyde resins. The thermo-mechanical properties analyzed in dynamic load thermo mechanical analysis were similar to those of the reference resins. Plywood panels manufactured using these lignin-based resins reached the specifications for industrial panels according to the French standard for exterior plywood panels. Moreover, the formaldehyde content of these plywoods was low enough to satisfy even the most rigorous legislation.

Item Type:Article
HAL Id:hal-02134873
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Compagnie Industrielle de la Matière Végétale - CIMV (FRANCE)
Laboratory name:
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Deposited By: Loetitia MOYA
Deposited On:26 Oct 2018 08:31

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