Preparation of the water-resistant eco-friendly carbohydrate wood adhesives by Schiff base reaction

ABSTRACT

To prepare biomass-based wood adhesives with good bonding properties and water resistance is still a challenge and meaningful work in the field of the wood industry. Thus in this present study, under low reaction temperature conditions (50°C), sodium periodate was used as an oxidant to treat carbohydrates such as glucose, sucrose and starch to form biomass-derived aldehydes solutions. Then oxidized glucose- hexamethylenediamine (OGLH), oxidized sucrose- hexamethylenediamine (OSUH) and oxidized strarch-hexamethylenediamine (OSTH) resins were prepared via Schiff base reaction from these solutions with hexamethylenediamine. The resins obtained were applied to the preparation of three-layer laboratory plywood. The whole synthesis was a simple process and low energy consumption; meanwhile, OGLH and OSUH resins show excellent bonding performance, allowing them to be able to consider as a substitute for the current widely used urea-formaldehyde (UF) and its modified resin wood adhesives. Furthermore, this study provides a new process reference for the preparation of carbohydrate-based adhesives.

GRAPHICAL ABSTRACT

KEYWORDS:

• Oxidized carbohydrates
• Schiff base reaction
• wood adhesives
• water resistance

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [32160346], the Natural Science Foundation of Yunnan Province [202101AT070135, 202101BD070001-074, 202201AS070152], Scientific Research Fund Project of Yunnan Provincial Department of Education [2022J0490] and 111 Project [D21027].