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Particleboard bio-adhesive by glyoxalated lignin and oxidized dialdehyde starch crosslinked by urea

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Abstract

A new bio-sourced adhesive system is presented based on urea crosslinked glyoxalated lignin and dialdehyde starch obtained by hydrogen peroxide oxidation of starch. The molecular species formed and the reactions mechanism involved were identified by FTIR, 13C NMR, and MALDI-ToF mass spectrometry. Urea appears to react with both, glyoxalated lignin and dialdehyde starch. The adhesives based on this reaction were tested by means of laboratory particleboards, differential scanning calorimetry (DSC), and thermomechanical analysis (TMA). The results obtained for internal bond (IB) strength with this adhesive system are acceptable for producing particleboard according to the relevant European standards. Additionally, chemical crosslinking by using 5% on resin solids of partially bio-sourced glycerol glycidyl ether (GDE) improves the bonding strength of the resins so formed; the main crosslinking sites were also determined.

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Acknowledgements

This work was in part supported by the National Natural Science Foundation of China (NSFC 31971595), Scholarship from China Scholarship Council (CSC) and by the LERMAB, University of Lorraine. The LERMAB of the University of Lorraine is supported by a grant overseen by the French National Research Agency (ANR) as part of the Laboratory of Excellence (Labex) ARBRE. Special thanks to Mr. Haizhu Wu and Mrs.Yuhong Rong for their help in the DSC testing and the sample freeze-drying.

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Correspondence to Antonio Pizzi.

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Chen, X., Pizzi, A., Zhang, B. et al. Particleboard bio-adhesive by glyoxalated lignin and oxidized dialdehyde starch crosslinked by urea. Wood Sci Technol 56, 63–85 (2022). https://doi.org/10.1007/s00226-021-01344-z

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  • DOI: https://doi.org/10.1007/s00226-021-01344-z

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