Use of Carbopol 980 and carboxymethyl cellulose polymers as rheology modifiers of sodium-bentonite water dispersions

V. C. Kelessidis, E. Poulakakis, V. Chatzistamou

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The effects of polymer addition on the rheological parameters of sodium bentonite water dispersions at ambient conditions were studied using high molecular mass carboxymethylcellulose (CMC) and Carbopol 980. Adsorption isotherms using the batch equilibrium technique of the polymers onto the bentonite particles were Langmuir isotherms of the L1 type, indicating monolayer adsorption of the polymers onto the surface of the bentonite particles. The aqueous dispersions of 3% and 4% sodium bentonite exhibited Herschel-Bulkley rheological behavior. Addition of CMC up to 1.5% by mass to the 3% sodium bentonite dispersions decreased the yield stress and the flow consistency index because of the steric effects caused by the adsorption of the polymer. This state was then followed by a plateau of the yield stress and a considerable increase of the flow consistency index, indicating that after a particular polymer concentration, further addition merely increased the liquid viscosity of the mixture. The flow behavior index was not affected by CMC addition. Addition of Carbopol 980 to the 3% and 4% sodium bentonite dispersions up to 0.15% by mass again firstly decreased the yield stress and the flow consistency index, then increased the yield stress and the flow consistency index with increasing polymer concentration. The high shear viscosity of bentonite-Carbopol dispersions showed also a minimum followed by a drastic increase. The flow behavior index was not affected significantly by the polymer addition.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalApplied Clay Science
Volume54
Issue number1
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

Fingerprint

Bentonite
Carboxymethylcellulose Sodium
bentonite
rheology
Dispersions
Rheology
cellulose
Polymers
polymer
Sodium
sodium
Water
Yield stress
water
adsorption
isotherm
viscosity
Adsorption
Viscosity of liquids
Shear viscosity

Keywords

  • Adsorption
  • Bentonite dispersion
  • Carbopol
  • Carboxymethylcellulose
  • Drilling fluids
  • Rheology

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

Use of Carbopol 980 and carboxymethyl cellulose polymers as rheology modifiers of sodium-bentonite water dispersions. / Kelessidis, V. C.; Poulakakis, E.; Chatzistamou, V.

In: Applied Clay Science, Vol. 54, No. 1, 11.2011, p. 63-69.

Research output: Contribution to journalArticle

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