Highly water-resistant glyoxal-based copolymer resin for wood bonding and method for preparing the same

A highly water-resistant glyoxal-based copolymer resin was prepared by the co-condensation reaction of chitosan, urea, glyoxal, and glycerol, which solved the problem of insufficient water resistance of glyoxal synthetic resin and achieved an environmentally friendly and convenient wood bonding effect.

CN120737293BActive Publication Date: 2026-05-26SOUTHWEST FORESTRY UNIVERSITY
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Patent Information

Application Number
CN202510784385.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2026-05-26
Estimated Expiration
2045-06-12

AI Technical Summary

Technical Problem

The functionality of glyoxal in existing wood adhesives is not fully utilized, resulting in insufficient cross-linking of synthetic resins, making it difficult to form a dense cross-linking system, and resulting in insufficient water resistance and bonding ability. In addition, traditional adhesives have formaldehyde release problems.

Method used

A highly water-resistant glyoxal-based copolymer resin was prepared by the co-condensation reaction of chitosan, urea, glyoxal, and glycerol. By utilizing the structural advantages and functional group characteristics of chitosan, a dual cross-linked network system at both the chemical and physical levels was formed, avoiding the use of harmful substances and simplifying the preparation process.

Benefits of technology

It significantly improves the water resistance and bonding strength of the resin, meets the requirements for high water resistance, simplifies the preparation process, reduces costs, and achieves an environmentally friendly wood bonding effect.

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Abstract

This invention proposes a high water-resistant glyoxal-based copolymer resin for wood bonding and its preparation method, belonging to the field of chemical synthetic resin technology. The high water-resistant glyoxal-based copolymer resin for wood bonding of this invention is prepared through a copolymerization reaction of chitosan, urea, glyoxal, and glycerol. The resulting resin exhibits significantly improved water resistance, far exceeding the requirements for Class II plywood in the national standard. Furthermore, the preparation process is simple and can be easily integrated with existing industrial glue-making equipment, laying a solid foundation for industrial promotion. Moreover, its preparation process does not use harmful substances such as organic solvents, phenols, and formaldehyde, exhibiting outstanding green and environmentally friendly characteristics.
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Citation Information

Patent Citations

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  • Preparation and application of urea (U)-glyoxal (G)-chitosan (CS)-soybean protein copolycondensation resin wood adhesive

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