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Journal of Materials Science

, Volume 41, Issue 21, pp 6978–6983 | Cite as

Production of rice husks composites with Acacia mimosa tannin-based resin

  • B. Ndazi
  • J. V. Tesha
  • S. Karlsson
  • E. T. N. Bisanda
Article

Abstract

Rice husks are amongst the typical agricultural residues, which are easily available in huge amounts. They have been considered as raw material for composites panels’ production. However, the major hindrance in rice husks utilization for composite manufacture lies in the lack of direct interaction with most adhesive binders to form the anticipated interfacial bonds. Rice husks are highly siliceous and have poor resistance to alkaline and acidic conditions. Manufacture of rice husks composites panels having good interface bond is difficult and largely dependent on a proper understanding of the interaction between the husks and the binder. This paper presents and discusses results on the production of composites boards from a mixture of rice husks and wattle (Acacia mimosa) tannin based resin. The experimental results have shown that the ‘as received rice husks’ when blended with alkali-catalyzed tannin resin do not result in optimum composite panel properties. However, it was found that a slight physical modification of the rice husk particles by hammer-milling resulted in drastic improvements in the interfacial bond strength and stiffness of the composites panels from 0.041 MPa to 0.200 MPa and 1039 MPa to 1527 MPa, respectively.

Keywords

Tannin Impact Strength Rice Husk Condensed Tannin Lignocellulosic Material 

Notes

Acknowledgements

We are very grateful for the financial support from Sida-SAREC, and the technical assistance from The Royal Institute of Technology (KTH), Sweden.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • B. Ndazi
    • 1
  • J. V. Tesha
    • 1
  • S. Karlsson
    • 2
  • E. T. N. Bisanda
    • 3
  1. 1.University of Dar es SalaamDar es SalaamTanzania
  2. 2.Kungliga Tekniska Högskolan (KTH)StockholmSweden
  3. 3.Technology and ManagementKigali Institute of ScienceKigaliRwanda

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