Abstract
With the aim to utilize the waste biomass of mulberry branches, an injection-moulded wood-based composite was produced by a two-step physical method. Firstly, the thermoplastic wood flour was prepared by kneading wood flour in NaOH/urea solution. Secondly, the injection-moulded wood-based composite was produced by extruding kneaded wood flour with plasticizer. Through the interactions of the hydrogen bonds with NaOH/urea solution and plasticizer during the process of kneading and extrusion, wood flour was efficiently utilized as thermoplastic composite. The whole preparation process was simple and feasible. The mechanical properties of wood-based composites prepared using glycerol triacetate (GT) as plasticizer were much better than that of glycerin. At a GT content of 14 wt%, screw rotating speed of 60 r/min and extrusion temperature of 155 °C, the as-prepared wood-based composite exhibited satisfactory performance in terms of flexural strength (56.14 MPa), tensile strength (26.56 MPa) and elongation at break (3.96%). The thermostability of the wood-based composite decreased after kneading and extrusion.
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Acknowledgements
The authors are grateful for the financial support from the State Forestry Administration (No. 201204803), the National Key R&D Program of China (No. 2020YFE0100100) and the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Li, X., Ye, J., Hong, J. et al. A two-step physical method for fabrication of injection-moulded wood-based composite with NaOH/urea solution. Eur. J. Wood Prod. 80, 923–931 (2022). https://doi.org/10.1007/s00107-022-01812-8
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DOI: https://doi.org/10.1007/s00107-022-01812-8