ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 4, pp. 631−638. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © E.V. Shinkareva, O.A. Sycheva, 2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 4, pp. 519−526.
ORGANIC SYNTHESIS AND INDUSTRIAL
Abstract—The behavior of neat ED-20 epoxy resin and of its aqueous emulsions in the course of heating in the
temperature interval 20–500°С in the presence of cross-linking agents of different structures (NC-558, polyeth-
ylenepolyamine, Telalit 180, Epilink 701) was studied. The water absorption, hardness, and microstructure of
coatings prepared from these epoxy systems were examined.
Curing of Neat ED-20 Epoxy Resin
and of Its Aqueous Emulsions
E. V. Shinkareva and O. A. Sycheva
Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus,
ul. Surganova 9/1, Minsk, 220072 Belarus
Received February 11, 2016
Commercial organic-dilutable epoxy oligomers
(EOs) are very important for economy. They serve as a
basis for preparing a wide range of composite polymer
materials for various purposes . Aqueous emulsions
(AEs) of commercial oligomers are a new generation
of aqueous ﬁ lm-forming agents. Their advantages over
solutions of resins in organic solvents are environmental
safety, possibility of dilution with water, ﬁ re and
explosion safety, simplicity of application, high adhesion
to moist substrates, and good protective properties [2, 3].
It should be noted that epoxy compound based on
liquid resins cannot be used in coatings without using
special curing agents, which are in most cases aqueous
amine- or amide-containing formulations. The proper-
ties of coatings largely depend on the chemical compo-
sition and structure of curing agents and on the curing
conditions. Therefore, one of the most important prob-
lems in the development of epoxy composite materi-
als is the choice of an effective curing (cross-linking)
agent. The chemical nature and structure of curing
agents largely determine the structure of the 3D network
formed and inﬂ uence not only the processing properties
of compounds, but also the operation characteristics of
coatings obtained from them. The use of different types
of curing agents for epoxy resins (ERs) allows prepara-
tion of compounds with a wide range of properties .
Therefore, one of key problems in the development of
epoxy composite materials is the choice of an effective
cross-linking agent. It is known that water present in ep-
oxy systems can alter the curing process, e.g., the tem-
perature conditions of drying [3, 4].
In this study, we compare the behavior of neat ER and
AE based on it in the course of heating in the presence of
cross-linking agents of different structures and examine
the properties of coatings prepared from the ER.
As curing agents we used NC-558 phenalkamine
product (Cardolite), polyethylenepolyamine [PEPA,
TU (Technical Speciﬁ cation) 2413-214-00203312–
2002], and water-dilutable adducts Epilink 701 (Air
Products, the United States) and Telalit 180 (Spolche-
mie, Czech Republic). As objects to be cured we used
ED-20 liquid epoxy–4,4'-isopropylidenediphenol res-
in with 20% content of epoxy groups and molecular
= 500 [GOST (State Standard) 10587–84,
Russia) and oil-in-water AE with 60% content of the
dispersed phase (resin), obtained by direct emulsiﬁ -
cation of the ER in the presence of a nonionic emulsi-
ﬁ er and a stabilizer (organic microparticles (TU BY
100029049.060–2011, developed by the Institute of
General and Inorganic Chemistry, National Academy
of Sciences of Belarus) .