Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 10, pp. 1624−1628.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © N.P. Nikolaeva, M.V. Kuz’min, N.I. Kol’tsov, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 10, pp. 1673−1676.
Fast-Curing Epoxyurethane Coatings
N. P. Nikolaeva, M. V. Kuz’min, and N. I. Kol’tsov
I.N. Ulyanov Chuvash State University, Cheboksary, Chuvash Republic, Russia
Received September 27, 2013
Abstract—Fundamental aspects of synthesis and the properties of fast-curing epoxyurethane polymeric coatings
based on ED-20 (Russia), Epikote 862 (Great Britain), and Der 331 (USA) epoxy resins, industrially manufac-
tured domestic polyesters PDA 800 and PS, polyisocyanate, and Lapramol 294 were studied. It is shown that the
foreign epoxy resins can be replaced with ED-20 resin and this resin can be used to obtain high-quality fast-curing
epoxyurethane polymeric coatings that can be used to protect metal surfaces.
Epoxyurethane polymeric coatings (EPCs) are
produced from formulations based on epoxy resins
(ERs), polyesters, and polyisocyanates (PICs) [1–3].
The coatings have god physicomechanical properties
and chemical stability. Formulations of this kind are
mostly produced from foreign epoxy resins Epikote 862
(Great Britain) and Der 331 (United States), which are
analogs of the domestic epoxydiane resin ED-20 [4,
5]. Replacement of foreign ERs with those of domestic
origin in formulations of paint-and-varnish materials
poses a difﬁ cult problem [6, 7] because foreign ERs
strongly differ from those of domestic manufacture in
rheological characteristics and especially in reactivity.
Therefore, a topical task is to develop EPCs based
on domestic ERs and study of their properties and to
determine their formulation and synthesis conditions. It
has been shown previously  that EPCs that compare
well with those based on imported ERs can be obtained
using ED-20 resin. However, the EPCs deposited by this
method require a prolonged curing.
This communication is concerned with the
fundamental aspects of synthesis and the properties of
fast-curing two-can EPCs based on ED-20, Epikote 862,
and Der 331 epoxy resins.
As the starting substances served industrially
manufactured products: liquid epoxy resins ED-20
[GOST (State Standard) 10587–84, 20.9% epoxy
= 410, 1.7% OH groups), Epikote 862
(Resolution Performance Products, Great Britain,
= 339, 25.4% epoxy groups), and Der 331 (Dow
Chemical, United States, 23.0% epoxy groups, M
1.8% OH groups); polyesters PDA 800 [TU (Technical
Speciﬁ cation) 38.103287–80, M
= 806, 4.2% OH
groups), and PS (TU 38.103260–80, M
= 1405, 2.6%
OH groups) based on diethylene glycol and adipic
acid; Lapramol 294, oxypropylated ethylenediamine
(N,N'-tetrapropanolethylenediamine, TU 2226-010-
= 290, 23.4% OH groups; all treated
in a vacuum for 1 h prior to being used; polyisocyanate
(PIC) based on 4,4'-diphenylmethanediisocyanate
(TU 113-03-29-22–84, 33% NCO groups) and toluene
(GOST 14710–78, M = 92, bp = 110.6°C, n
used without additional puriﬁ cation.
The epoxyurethane polymeric coatings were obtained
in two stages. In the ﬁ rst stage, tetrapolyfunctional
epoxypolyesters were produced by reacting polyesters
with epoxy resins at temperatures of 160–180°C
and permanent vacuum treatment (residual pressure
3–5 mm Hg). Then, epoxypolyesters cooled to 20°C
and Lapramol 294 were dissolved in toluene to give
component A containing 30 to 50 wt % epoxypolyester
and 3 to 7 wt % Lapramol 294. As component B
served PIC mixed with component A at 1 : (0.9–1.2)