1070-4272/05/7808-1312 + 2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 8, 2005, pp. 1312!1315. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 8, 2005,
Original Russian Text Copyright + 2005 by Chursin.
AND INDUSTRIAL ORGANIC CHEMISTRY
Colloid-Chemical Properties of Organic!Aqueous Surfactants
V. I. Chursin
Research Institute of Tanning Industry, Federal State Unitary Enterprise, Moscow, Russia
Received March, 24, 2005
Abstract-The colloid-chemical properties of organic3aqueous formulations including a nonionic surfactant,
an organic solvent, and polyethylenepolyamine were studied. The most efficient methods for preparation of
a new degreasing material, Skianol, were determined.
Efficient degreasing of leather and fur raw ma-
terial implies use of surfactants with high dispers-
ing and washing properties, whose components pro-
mote dissolution of natural skin fats. We suggested
the compositions for such formulations in . How-
ever, development of a universal organic!aqueous
composition affording the maximum extent of fat re-
moval requires optimization of both the method of its
preparation and its composition.
In this study, we examined how an organic solvent
and an amine-containing additive affect the colloid-
chemical properties of an organic!aqueous formula-
tion and its preparation in the optimal, from the view-
point of the technological use, consistency, namely,
as a gel. We showed in  that introduction of an or-
ganic solvent into aqueous solutions of surfactants
decreases the surface tension of the system formed. It
can be assumed that other properties of these systems
will change as well. Organic-aqueous systems are of
both scientific and practical interest. It is known that
the nature of the intermolecular interactions and mor-
phological structures formed in such systems depends
on the content of the organic solvent . A study of
the electrical conductivity of organic!aqueous for-
mulations can facilitate the choice of the optimal com-
We studied the properties of aqueous solutions
of Neonol 9-10 and Neonol 9-12 in the presence of
an organic solvent (turpentine) and an amine-con-
taining compound (polyethylenepolyamine, PEPA).
The concentration of the surfactant in the aqueous
solutions was 50%, and that of PEPA, 2 %. The elec-
trical conductivity of the solutions was measured on
a Hanna conductometer.
Figure 1 shows the results of conductometric titra-
tion of an aqueous solution of the surfactant with
an organic solvent in the presence of an auxiliary
amine-containing additive. It is seen from Fig. 1 that,
upon addition of the organic component to the aqueous
solution of the surfactant, the electrical conductivity
of the latter decreases. This is due to a decrease in
the dielectric constant of the system. On the whole,
the electrical conductivity of the solutions in the pres-
ence of the amine-containing compound is higher than
that in the systems containing solely the surfactant.
Introduction of the solvent into the system without
a surfactant also causes the electrical conductivity to
decrease; but this process is characterized by the lack
of kinetic stability of the system owing to a nonuni-
form distribution of the organic component through-
out of the system.
When a certain amount of the organic solvent was
introduced into the system during conductometric ti-
tration of the surfactant solutions, the system turned
Fig. 1. Electrical conductivity ? of the surfactant solu-
tions vs. the volume V of the solvent. (1) PEPA!Neonol
9-10, (2) PEPA!Neonol 9-12, and (3) Neonol 9-12.