Rheological properties of modified dispersions of montmorillonite





rheological properties, modification, montmorillonite, aluminum compounds, viscosity, dermis structure.


Background. A special crystal lattice and a characteristic surface of clay mineralsmakes them widely used in various industries, including leather. As a result of modification, the mineral particles change the sign and the magnitude of charge of the surface, which makes it possible to form the structure of the dermis during the technological process of producing the skin of various intended purposes.
The aim of the work is to determine the rheological properties of dispersions of modified montmorillonite to produce tannery materials and to effectively form the structure of the dermis.
Materials and methods. Bentonite clays of Dashukivsky deposit (Cherkasy region, Ukraine) were used for the study. The content of montmorillonite in bentonite clays was 85 %. The modification was carried out in stages by sodium carbonate or alumina-potassium braids.
The study of rheological properties of modified dispersions included the determi­nation of kinematic viscosity, pH, dynamic and plastic viscosity, velocity and shear stress.
Results. The results of studies of the influence of Al2O3 consumption for the modification of montmorillonite dispersions indicate that, with an increase in Al2O3 consumption up to 3.5 %, the displacement of the rheological curves into the zone of high shear stress occurs. These changes point to strengthening the structure and coagulation in the system. A further increase in the concentration of Al2O3 to the level of 7–20 % is characterized by a sharp decrease in the curves, and their displacement in the zone of lower values of shear stress, indicating the dilution of the dispersion and the complete peptization of the dispersion.
Conclusion. The ion exchange substitution of Na+-ions by the complex of aluminum ions substantially affects the rheological properties of mineral dispersions.
The obtaining of the most stable dispersions of montmorillonite occurs at the expense of aluminum compounds in terms of Al2O3 in the range of 5–7 %, which are characterized by a stable pH 3.0–3.5.
An increase in the concentration of aluminum compounds leads to significant dilution of dispersions and to a sharp drop in the viscosity of modified dispersions.
The positively charged modified dispersions of montmorillonite MMTAl can be used for further studies.

Author Biographies

Maryna ZHALDAK, Kyiv National University of Trade and Economics

Postgraduate student at the Department of Commodity and Customs Affairs

Olena MOKROUSOVA, Kyiv National University of Trade and Economics

Doctor of Sciences (Technical), Professor at the Department of Commodity and Customs Affairs


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How to Cite

ZHALDAK М., & MOKROUSOVA О. (2019). Rheological properties of modified dispersions of montmorillonite. "INTERNATIONAL·SCIENTIFIC-·PRACTICAL·JOURNAL·COMMODITIES·AND·MARKETS", 29(1), 52–60. https://doi.org/10.31617/tr.knute.2019(29)05