ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 11, pp. 1976–1980. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © A.V. Kulikov, A.I. Kurkin, Ya.D. Samuilov, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 11, pp. 1861–1865.
Influence of the Nature of Curing Agents on Properties
of Polyetherurethanethiol Composites
A. V. Kulikov, A. I. Kurkin, and Ya. D. Samuilov
Kazan State Technological University, Kazan, Tatarstan, Russia
Received February 29, 2008
Abstract—The effect of the nature of curing agents on the properties of sealants based on polyetherure-
thanethiols was examined.
HS-Terminal oligomers are widely applied for pre-
paring mastics and sealants used in machine and ship
building, aviation industry, and construction [1–4].
However, preparation of such oligomers, Thiokols, is
extremely hazardous for the environment. Production
of 1 t of Thiokol involves formation of 60 t of highly
toxic aqueous–organic salt solutions requiring utiliza-
tion. Therefore, of increased interest are procedures for
preparing SH-containing oligomers that do not involve
formation of so large amounts of wastewater. Princi-
pally, such routes exist. For example, the reaction of
polyetherdiols or –triols with diisocyanates yields
ties of sealants prepared on the basis of PEUT, in par-
ticular, to reveal the dependences of the physicome-
chanical properties of the vulcanizates on the nature
of the curing agents, because it is well known that
this factor strongly affects the properties of sealants
AND POLYMERIC MATERIALS
–OH + O=C=N–R–N=C=O → ~O–CO–NH–R–N=C=O.
The reaction of preisocyanates with mercapto
alcohols allows preparation of polyetherurethanethiols
~O–CO–NH–R–N=C=O + HO–CH
These compounds contain terminal mercapto
groups, which can be oxidized to disulfide groups or
converted to metal mercaptides. In so doing, the mate-
rial will be cured with the formation of a 3D structure.
This procedure is environmentally clean. The PEUT
synthesis process is single-step. All these advantages
attract attention. However, until now, only scarce pat-
ent information concerning this approach was avail-
able, and there are virtually no data on the properties
of sealants based on PEUT [5, 6].
The goal of this study was to examine the proper-
The substances used in this study met the require-
ments indicated in Table 1.
Laprol used for preparing PEUT was preliminarily
dried in a vacuum at a residual pressure of 2600 Pa and
Table 1. Grades of substances used
Name GOST, TU no.
Laprol 3603-2-12 TU 2226-015-10488057–94
2-Mercaptoethanol BASF product (Germany), 99.99%
Finely dispersed chalk
Manganese dioxide TU 6-09-01-775–90
Sodium bichromate GOST 2651–78
Zinc oxide GOST 202–84
(TU) Technical specification and (GOST) State standard.