Journals / JRM / Vol.9, No.2


Research Article

BEST PAPER 2021

Study on the Soy Protein-Based Adhesive Cross-Linked by Glyoxal

Zhigang Wu1,2,#, Jiankun Liang3,#, Hong Lei1,*, Bengang Zhang1, Xuedong Xi1, Lifen Li2
1 Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, 650224, China
2 College of Forestry, Guizhou University, Guiyang, 550025, China
3 Kaili University, Qiandongnan, 556011, China
* Corresponding Author: Hong Lei. Email:
(This article belongs to this Special Issue: Renewable and Biosourced Adhesives)

Abstract

Based on the ESI-MS and 13C-NMR analysis of the forms of glyoxal in acidic and alkaline solutions, the soy-based adhesive cross-linked by glyoxal was prepared in this work. The results showed that glyoxal existed in water in different forms at different pH levels. Under alkaline conditions, glyoxal transformed to glycolate through the intramolecular disproportionation reaction. Under acidic conditions, although some of glyoxal transformed to glycolate as what happened under alkaline conditions, most of glyoxal molecules existed in the form of five- or six-membered cyclic ether structure. No ethylene tetraol or free aldehyde group was actually detected under these conditions. Although glyoxal reacted with soy protein under both acidic and alkaline conditions, alkaline conditions were more favorable for the improvement of mechanical performance and water resistance of soy-based adhesives than acid conditions.

Keywords

Glyoxal; soy protein-based adhesive; cross-link
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