ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 3, pp. 487!489. + Pleiades Publishing, Ltd., 2008.
Original Russian Text + L.P. Varlamova, V.A. Izvozchikova, A.S. Averchenko, Yu.D. Semchikov, S.A. Ryabov, 2008, published in Zhurnal Prikladnoi
Khimii, 2008, Vol. 81, No. 3, pp. 502!504.
AND POLYMERIC MATERIALS
Effect of Aluminosilicate Microspheres on Physicomechanical
and Rheological Properties of Rigid Foamed Polyurethanes
L. P. Varlamova, V. A. Izvozchikova, A. S. Averchenko,
Yu. D. Semchikov, and S. A. Ryabov
Research Institute of Chemistry, Lobachevsky Nizhni Novgorod State University, Nizhni Novgorod, Russia
Lobachevsky Nizhni Novgorod State University, Nizhni Novgorod, Russia
Received July 5, 2007
Abstract-Possibility of obtaining rigid foamed polyurethanes filled with aluminosilicate microspheres was
analyzed. The physicomechanical and rheological properties of these composites were studied.
Foamed polyurethanes (FPU) are widely used in
building, transportation, and many other fields of
natural economy because of their unique heat- and
sound-insulating properties and simplicity of prepara-
tion and use. Numerous plants in our country and
abroad manufacture on a large scale both FPU sys-
tems and finished articles for various purposes.
At the same time, purely FPU systems have ex-
hausted their potentialities, because it is impossible to
control physicomechanical and other parameters, e.g.,
combustibility and softening point, by only varying
the FPU composition, and, therefore, use of various
organic and inorganic fillers, plasticizers, and fire
retardants opens up wide opportunities of modifica-
tion of their properties .
The post promising in this context is modifica-
tion of properties of FPU systems with ash alumino-
silicate microspheres (AASM), which are formed
as a waste, the so-called ash carryover, at thermal
The unique properties of AASM, such as the mi-
crospherical shape with diameters of 20 to 400 mm,
low bulk density (0.323 0.68 g cm
), low heat con-
ductivity, high strength, and inertness toward organic
solvents, acids, and alkalis predetermined the wide
applicability of this product. The low density of
AASM is the most important property, which enables
their use as a filler for polymeric materials and
provides a low materials consumption without impair-
ing the heat- and sound-insulating properties.
As a filler were used AASM [TU (Technical
Specification) 14.2-25 595 170-00132003]. Composite
FPUs were obtained by a single-stage method consist-
ing in simultaneous mixing of all the components
(A and B). Because single-stage systems are mixed
at room temperature, it is necessary that all the com-
ponents should be in the liquid phase and have a satis-
factory degree of compatibility [2, 3]. When preparing
FPU, microspheres were preliminarily mixed with
component A to obtain a homogeneous mass. The
samples obtained were kept at 20oC for no less than
24 h from the instant of material preparation to its
The kinetic parameters of foam formation (times of
foaming onset, gelation, and foam rise) were moni-
tored using a stopwatch. The apparent density was
determined in conformity with GOST (State Standard)
409377 with a determination error of + 0.5 kg m
The breaking compression stress was determined on
an METEFEM-khr01 machine at room temperature.
The dimensions of the samples for tests were 500 500
50 mm, and the compression rate was 60 mm min
It should be particularly noted that the samples being
tested are only compressed, without crumbling or
brittle fracture. The measurement error was +5%.
The heat conductivity l (W m
) was deter-
mined by measuring the steady heat flux in a mono-
tonic heating mode on an ITP-MG4 instrument in
conformity with its working manual .