High‐strength, water‐resistant, formaldehyde‐free cellulose‐based thermosetting resin for wood bonding

Author:

Li Zhi1,Du Guanben12,Liu Tongda1,Li Hongshan1,Zhang Xu1,Deng Shuduan1,Ran Xin1,Gao Wei1,Yang Long12ORCID

Affiliation:

1. Yunnan Province Key Lab of Wood Adhesives and Glued Products, International Joint Research Center for Biomass Materials Southwest Forestry University Kunming China

2. Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains, Ministry of Education Southwest Forestry University Kunming China

Abstract

AbstractDespite the continued dominance of detrimental formaldehyde‐based binders in the wood reconstituted products, there is a growing push to develop more environmentally friendly alternatives. Cellulose‐based biomass adhesives have been extensively researched and documented. However, their industrial application is limited due to inadequate water resistance and suboptimal coating ability. In this study, a cellulose‐derived wood binder with a hyperbranched entangling structure was synthesized by covalently cross‐linking branched polyethylenimine and oxycellulose through Schiff base formation. The dry/wet bonding strength of the prepared plywood was 2.07 and 1.52 MPa, respectively, exhibiting a remarkable increase and breakthrough compared to that of pure oxidized cellulose binder. This can be attributed to the formation of a water‐resistant Schiff base tangle network, which enhances the toughness of the adhesive. Notably, the pure cellulose adhesive tends to agglomerate on the wood surface, whereas the hyperbranched modified cellulose adhesive exhibits a more uniform coating ability. This study further demonstrates the reliable potential of tangle structures based on Schiff base reactions in the development of biomass‐based adhesives.Highlights A high bonding strength cellulose‐based wood adhesive was prepared. The Schiff base reactions have been used to construct cross‐linked structures. The cross‐linked network structure provides excellent water resistance. The cured cellulose‐based adhesive has excellent dry/wet bonding strength.

Funder

National Natural Science Foundation of China

Higher Education Discipline Innovation Project

Publisher

Wiley

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