木质素环氧化接枝物及其制备大豆蛋白胶黏剂研究

doi:10.11896/cldb.20080166

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Abstract In this work, enzymatic lignin was demethylated to improve its hydroxyl content, so as to increase the degree of epoxidation of lignin and ethy-lene glycol diglycidyl ether.The epoxy graft polymer of lignin (EPDL) with high epoxy value was synthesized by the reaction of lignin with ethy-lene glycol diglycidyl ether (EGDE) in alkaline condition, and which was used as a crosslinking agent to prepare high-performance green soy protein-based adhesive. Demethylated lignin (DL) and EPDL were characterized by ³¹P-NMR and FTIR. Hydroxyl content of lignin before and after demethylation, epoxy value and chemical structure of epoxy graft copolymer were discussed. The effect of soybean protein adhesives modified by EPDL on the wet bonding strength was investigated. The results showed that the content of hydroxyl group in lignin was increased by demethylation. Microwave heating significantly shortened the demethylation time of lignin and increased the hydroxyl content by 29% compared with the original lignin (L). More epoxy groups were grafted onto lignin and the epoxy value reached 0.350 mol/100 g by demethylation, which increased the cross-linking reaction activity between EPDL and SPI molecule. The water-resistant chemical structure could be formed by the crosslinking reaction of EPDL with hydroxyl group and amino group of soybean protein, which could improve the heat resistance and bonding strength of soy protein-based adhesive. When the amount of EPDL was 7%, the wet bonding strength of EPDL-SPI adhesive reached to the maximum value of 1.14 MPa, that far outstrips the requirements of class Ⅱ plywood specified in GB/T9846-2015 national standard.

Key words： enzymatic hydrolysis lignin soy-based adhesives demethylation epoxy graft polymer bonding strength

Published: 12 November 2021

CLC number:

TQ432

Fund:Cooperation Project of Zhejiang Province and China Academy of Forestry(2018SY02).

Corresponding Authors: fandongbin8@163.com

About author:: Huan Chen received his bachelor’s degree in June 2019 from Southwest Forestry University in wood science and engineering. He has studied in the Wood Industry Research Institute of Chinese Academy of Forestry (CAF) since September 2019, focusing on the research of wood chemistry and adhesives.
Dongbin Fan is currently an associate professor and master instructor in the Wood Industry Research Institute of Chinese Academy of Forestry (CAF). His research interests are the technology development and application of environmental friendly wood adhesives and wood resource utilization. More than 40 papers have been published in academic journals at home and abroad, including more than 20 SCI papers, and 10 invention patents have been applied.

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	CHEN Huan
	WANG Zongtao
	CHEN Shiqing
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Cite this article:

CHEN Huan,WANG Zongtao,CHEN Shiqing, et al. Synthesis of Epoxy Graft Copolymer of Lignin and Its Application in Preparing Soy Protein-based Adhesives[J]. Materials Reports, 2021, 35(20): 20190-20194.

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http://www.mater-rep.com/EN/10.11896/cldb.20080166 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20190

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