Chapter 28. Dispersant Demand Curves: Effect of PAA on the Viscosity of Several Clays

  1. Willam M. Carty
  1. Michael Brumbach and
  2. W. M. Carty

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294796.ch28

Whitewares and Materials: Ceramic Engineering and Science Proceedings, Volume 24, Issue 2

Whitewares and Materials: Ceramic Engineering and Science Proceedings, Volume 24, Issue 2

How to Cite

Brumbach, M. and Carty, W. M. (2003) Dispersant Demand Curves: Effect of PAA on the Viscosity of Several Clays, in Whitewares and Materials: Ceramic Engineering and Science Proceedings, Volume 24, Issue 2 (ed W. M. Carty), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294796.ch28

Author Information

  1. Whiteware Research Center; Alfred University, Alfred, NY

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375822

Online ISBN: 9780470294796

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Keywords:

  • polymethacrylic acid;
  • polymeric;
  • characterize;
  • intensity;
  • impurities

Summary

Mineral impurities in kaolinitic clays can lead to unpredictable and problematic behavior in whiteware suspensions for industrial applications. In this work, Darvan 811 (a sodium polyacrylate) was evaluated for its effectiveness as a dispersant for five commercial clays: EPK, Weldon Victoria, Huntingdon, TK6, Superstandard Porcelain, and M&D. EPK is a virtually clean kaolinite and represents the standard viscosity curve for the interaction of PAA with a kaolinitic clay. Dispersion behavior indicated significant mineral impurities in Weldon Victoria, Huntingdon, and TK6. The rheology of Superstandard Porcelain was found to correlate with the high K+ levels of the clay. And finally, M&D ball clay was determined to have cation levels sufficiently high to cause coagulation over the entire dispersant range (a problem that can be avoided by working at lower solids loadings). Adjustment of the demand curves to accommodate mineral impurities (i.e., to represent the behavior of the kaolinite fraction alone) result in alignment of the curves at low dispersant levels.