Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 1, pp. 114−118.
Pleiades Publishing, Ltd., 2014.
Original Russian Text V.P. Zakharov, V.Z. Mingaleev, E.M. Zakharova, I.Sh. Nasyrov, D.A. Zhavoronkov, V.Yu. Faizov, 2014, published in Zhurnal
Prikladnoi Khimii, 2014, Vol. 87, No. 1, pp. 120−124.
Preparation of an Adhesion-Reducing Agent for Synthetic
Caoutchouc in a Tubular Turbulent Apparatus
V. P. Zakharov
, V. Z. Mingaleev
, E. M. Zakharova
, I. Sh. Nasyrov
D. A. Zhavoronkov
, and V. Yu. Faizova
Bashkir State University, ul. Zaki Validi 32, Ufa, Bashkortostan, 450076 Russia
Institute of Organic Chemistry, Ufa Scientiﬁ c Center, Russian Academy of Sciences, pr. Oktyabrya 71,
Ufa, Bashkortostan, 450054 Russia
Sintez-Kauchuk OAO, ul. Tekhnicheskaya 14, Sterlitamak, Bashkortostan, 453110 Russia
Received January 13, 2014
Abstract—Results of a study of the fundamental aspects of preparation of an adhesion-reducing agent for synthetic
caoutchouc, based on commercial calcium stearate, are presented. A method for preparing an adhesion-reducing
agent in a turbulent apparatus is suggested. The method yields SKI-3 isoprene caoutchouc satisfying the require-
ments to the content of stearic acid, with the content of chlorine ionsa in wastewater diminished by a factor of 1.8.
When synthetic caoutchoucs are manufactured by the
method of solvent polymerization, adhesion-reducing
agents are used in the stage of polymer isolation from
the reaction mixture by aqueous degassing in order to
preclude adherence of the polymer ﬂ ake by creating
a structural-mechanical barrier on its surface. This fa-
cilitates removal of residual amounts of the unreacted
monomer and solvent from synthesis products. Finely
dispersed aqueous suspensions of insoluble stearic acid
salts and, in particular, calcium stearate are widely used
as adhesion-reducing agents in manufacture of synthetic
A uniform distribution of ﬁ ne particles on the surface
of polymer ﬂ akes is provided by freshly prepared calcium
stearate with a concentration of 1–7 wt %, produced by
the two-stage scheme :
COOH + KОН → C
COOK + Н
COOK + СаCl
Ca↓ + 2 KCl.
In the second stage, there occurs, irreversibly and at a
high rate, the reaction in which a solid phase is formed,
which makes it possible to affect the dispersity of particles
via dilution of the starting reagents and intensiﬁ cation of
the turbulent agitation.
To disadvantages of this method belongs the com-
plicated dosage of the starting reagents, which favors
an increase in the residual amounts of calcium stearate
(stearic acid) in the ﬁ nished product.
If an excess amount of calcium chloride is taken
to completely convert calcium stearate to the water-
insoluble calcium stearate, a considerable amount of
chlorine-containing wastewater is formed. Application of
an adhesion-reducing agent in manufacture of synthetic
caoutchoucs can be made more technologically conve-
nient by use of a commercial powdered calcium stearate
available in the market of chemical products.
At the same time, the poor wettability of the calcium
stearate powder with water results in that a coarsely
dispersed suspension is obtained. In this case, the key
stage is that in which an aqueous suspension is prepared
from the powder and particles are dispersed immediately
before being used in the degassing stage. It was shown
in [2, 3] that the dispersity of aqueous suspensions can
be effectively affected both in their preparation (freshly
prepared) and in treatment upon a preliminary preparation