INORGANIC SYNTHESIS AND INDUSTRIAL
Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 2, pp. 179−183.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © I.P. Kazhuro, V.D. Koshevar, G.V. Bychko, O.A. Sycheva, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 2,
Dispersity of Titanium Dioxide
in Medium of Synthetic Latexes and Aggregation Stability
of Mixed Dispersions Formed
I. P. Kazhuro, V. D. Koshevar, G. V. Bychko, and O. A. Sycheva
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Received December 3, 2009
Abstract—Dispersion of titanium dioxide in the presence of synthetic latexes was studied as a function of pH of
the medium, concentration of components of a disperse phase, and stability of the formed systems.
Currently, titanium dioxide is widely used as a basic
and a doping material in composite and ceramic articles,
as an effective pigment in the manufacture of pain-and-
vanish materials, and as UV ﬁ lter in coatings for photo-
catalytic cells and ceramic ﬁ lms.
Therefore, the electrical surface properties and sta-
bility of the dispersions of this compound have been
extensively studied [1–6].
Commonly, aqueous TiO
dispersions are used to
obtain the above products and materials. It was found
that for paints and pigment pastes in particular the qual-
ity depends strongly on the dispersity of TiO
stability of the disperse system as a whole. In [2, 7], water
soluble polymers were used for stabilization of aqueous
dispersions. As known, aqueous ТiO
are stable in strongly acidic [5, 8] and strongly alkaline
 solutions. However, such behavior of the dispersions
is not always observed [10, 11]. This once again conﬁ rms
the need to determine the effect exerted by conditions of
the dispersion preparation and by chemical nature of the
components on their colloid-chemical properties.
The study is concerned with the effect exerted by
chemical nature of latexes and pH of the dispersion
medium on the dispersity and aggregation stability of
dispersions in aqueous and aqueous-polymeric
We used in the study commercial synthetic latexes,
which are widely applied in different areas of construc-
tion industry: acrylic latex (AC) of the Finndisp RSD
20 brand (Finland) and carboxylated styrene–butadiene
(SB) latex of the Lipaton SB 5521 brand (Germany).
Dispersions of these ﬁ lm-forming systems in aqueous
medium are stabilized by surface active agents, salts of
fatty acids, in particular.
As mineral disperse phase (DP) was used titanium
dioxide of the Crimea CR-02 brand produced at the Close
Joint-Stock Company Crimea Titan. The properties of the
substances under study are given in Table 1.
The granulometric composition of the ТiO
sions in water and latexes was determined on an FSKh-4
photosedimentometer (Russia). A computer unit calcu-
lated the integral and differential size distribution func-
tions by the mass and number of particles and a number
of statistical characteristics. Dispersions were placed into
a measuring capacity (working volume 400 cm
intensely agitated three times by a propeller stirrer of the
photosedimentometr for 5 s. Data obtained in measuring
the granulometric composition on the parameters studied
also conﬁ rmed, if particles are in dispersed or aggregated
state. The aggregation stability was determined by the
turbidimetric method by measuring the change in optical