Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 11, pp. 1978−1982.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © N.V. Kryuchkova, Yu.N. Orlov, S.V. Levanova, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 11, pp. 1893−1897.
AND POLYMERIC MATERIALS
Recovery of Emulsion Butadiene–(α-Methyl)styrene
Rubbers Using a Cationic Polyelectrolyte,
N. V. Kryuchkova
, Yu. N. Orlov
, and S. V. Levanova
Tol’yattikauchuk Limited Liability Company, Togliatti, Samara oblast, Russia
Samara State Technical University, Samara, Russia
Received March 11, 2011
Abstract—The coagulating power of Reagent EPAM cationic polyelectrolyte in the course of rubber recovery
from SKMS-30ARK butadiene–(α-methyl)styrene latex was studied, and the efﬁ ciency of the commercial use of
this polyelectrolyte was examined.
One of the main lines of improving processes
for emulsion rubber production is making them
environmentally safer by introducing green technologies.
Particular attention has been given recently to salt-
free coagulation of synthetic latex in the step of the
rubber recovery. With replacement of the traditionally
used electrolyte (sodium chloride) by cationic
polyelectrolytes (CPEs), the discharge of chlorides
into water bodies is considerably reduced, and the
discharge of nonbiodegradable Leukanol dispersant into
the enterprise wastewater is fully excluded. As a result,
the environmental impact is mitigated. In addition, the
use of CPEs as ﬂ occulants is economically expedient,
because it ensures complete rubber recovery at minimal
Numerous organic coagulants of different nature
are known today [1–3], but data on their effect on the
process of the rubber recovery from latex and on the
properties of the ready rubbers are fragmentary. In this
respect, of much interest are quaternary ammonium
salts, which are highly reactive and relatively available
and cheap .
In this study we examined the ﬂ occulating activity
chloride (PDMHPAC) having the following structure:
The commercial name of the product is Reagent
EPAM. It is a water-soluble cationic polymer prepared by
the condensation of dimethylamine with epichlorohydrin
. The use of this polymer as ﬂ occulant for synthetic
latexes was not studied previously in detail.
In this study, the ﬂ occulating action of PDMHPAC
in the course of the rubber recovery from synthetic latex
was examined in a wide range of dispersed phase concen-
trations, pH values of the serum, and temperatures. The
effect of the coagulant on the properties of the recovered
rubber was also analyzed.
The initial commercial 50% solution of the reagent
(density 1.150–1.155 g cm
, pH 5–6) was used in this
study after the dilution to a concentration of 1–2 wt %.
Experiments were performed with a commercial sample
of SKMS-30ARK butadiene–α-methylstyrene latex
prepared using anionic emulsiﬁ ers (potassium soaps of
diproportionated resin and fatty acids, EDiSKAN 1010-