The Use of Maleated Lignin based Polyacid as Catalyst in Urea-Lignin-Glyoxal Wood Adhesive

Document Type : Research Paper

Author

Department of wood science and technology, Semnan University, Semnan, Iran

Abstract

Nowadays, finding a catalyst with high quality and eco-friendly thermoset resins is very valuable. This study aimed to investigate the effect of maleated lignin-based polyacid (MA-PL) as a catalyst in urea-lignin-glyoxal (ULG) resin. For this reason, a phenolate reaction was done to increase the hydroxyl groups of lignin. Then the modified lignin was reacted with maleic anhydride to obtain polyacid based on maleated lignin. In the next step, different content of MA-PL catalyst (0, 1, 2, and 3 wt%) was added to ULG resin and prepared resins were used in particleboard panels production. Different properties of synthesized resins and panels were measured according to standard methods and were compared with those using ammonium chloride as the control sample. In addition, the thermal behavior of resin before and after adding catalyst was analyzed with Differential Scanning Calorimetry (DSC). Generally, the results of this research indicated that polyacids based lignin could be used as a suitable catalyst for ULG resin. Physical and mechanical test analysis indicated that the addition of catalyst from zero to 3 wt% continuously decrease pH and gelation time. DSC analysis showed that adding extra MA-PL reduces the curing temperature of resin compared with ammonium chloride. Based on the obtained results from manufactured panels, mechanical strength (MOE, MOR, and IB strength) and dimensional stability of the panels was improved by adding 3 wt% MA-PL.

Keywords

References

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Iranian Journal of Wood and Paper Industries
Volume 12, Issue 3
December 2021
Pages 351-361

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