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Rheological Properties of Organophilic Synthetic Hectorites and Saponites

Published online by Cambridge University Press:  02 April 2024

Takashi Iwasaki ,
Yoshio Onodera  and
Kazuo Torii
Takashi Iwasaki
Affiliation:
Government Industrial Research Institute, Tohoku, Nigatake 4-2-1, Sendai 983 Japan
Yoshio Onodera
Affiliation:
Government Industrial Research Institute, Tohoku, Nigatake 4-2-1, Sendai 983 Japan
Kazuo Torii
Affiliation:
Government Industrial Research Institute, Tohoku, Nigatake 4-2-1, Sendai 983 Japan
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Abstract

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To determine the dependency of rheological properties on mineralogical characteristics, eleven organophilic hectorite and nine organophilic saponite samples were prepared from hydrothermally synthesized smectites and a quaternary ammonium salt containing mainly octadecyl groups as alkyl chains and were examined by X-ray powder diffraction (XRD), particle size, chemical, and rheological procedures. The rheological properties of the organophilic products dispersed in toluene were found to depend chiefly on (1) particle size, (2) the expansion behavior of the stacked clay platelets, in which the amount and location of negative charge of the silicate layer affected the expandability, and (3) the amount of methanol added as a polar activator. By the addition of 2–4% methanol, apparent viscosities of the hectorite clays were drastically increased at low shear rate, although even a 10% addition did not significantly affect the saponite clays. Under the most suitable gellation conditions, the saponite clays showed lower apparent viscosity than the hectorite clays. Inasmuch as the former had its negative charge near the surface of the silicate layer and formed strong bonds to the organic ion, the expansion of the platelets was apparently difficult. An optimum layer charge for increasing the viscosity was found; specifically 0.45–0.50 and 0.50–0.55 equivalents per half unit cell for saponite and hectorite clays, respectively. Because the saponite clays contained a denser population of organic ions than the hectorite clays, the ion density in the interlayer of both clays was considered to be the same, i.e., about 0.4 organic ions per unit ab area.

Keywords

HectoriteOrganophilicParticle aggregationRheologySaponiteSmectiteViscosityX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 248 - 257
Copyright
Copyright © 1989, The Clay Minerals Society

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