Stability and Colloid-Chemical Properties of Latex-Stabilized
Emulsions of Epoxy Resins in the Presence
of a Nonionic Surfactant
E. V. Shinkareva and V. D. Koshevar
Institute of General and Inorganic Chemistry, State Scientific Institution,
National Academy of Sciences of Belarus, Minsk, Belarus
Received February 27, 2010
Abstract—The stability of oil-in-water emulsions of ED-20 epoxy–4,4'-isopropylidenediphenol resin was
studied in relation to the emulsifier and stabilizer concentrations. The curing kinetics of coatings prepared from
this resin was studied.
AND POLYMERIC MATERIALS
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 12, pp. 2186–2192. © Pleiades Publishing, Ltd., 2010.
Original Russian Text © E.V. Shinkareva, V.D. Koshevar, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 12, pp. 2060–2066.
Paint-and-varnish formulations containing epoxy
resins and organic solvents are widely used for
preparing high-quality corrosion-protecting chemically
resistant coatings . However, organic-based paint-
and-varnish materials have, along with indubitable
advantages, also serious drawbacks. They exert
negative effect on the environment and human body.
Furthermore, such materials are inflammable and
dangerously explosive, and large capital investments
are required for construction of purification and
ventilation equipment. Therefore, the European Union
(European Parliament Directive 2004/42/ЕС) adopted
restrictions on production and use of paint-and-varnish
materials containing low-boiling organic solvents. In
particular, the share of organic-based paint-and-varnish
materials in world’s production during the past 5 years
decreased by 3%, whereas the share of environ-
mentally friendly water-dispersible paint-and-varnish
materials increased by 2.8% .
In accordance with this directive, procedures for
preparing film-forming systems by emulsification of
resins in water using a surfactant (emulsifier) and, if
necessary, stabilizing additives find growing use today
One of major problems in preparation of aqueous
emulsions of resins is to ensure their aggregative
stability (in storage, transportation, application) by
proper choice of emulsifier and stabilizer and of their
ratio. Nonionic, anionic, and cationic surfactants are
suggested as emulsifiers [3, 4]. The surfactant per-
formance is determined by the surface and adsorption
activity on phase boundaries and is characterized by
the hydrophilic–lipophilic balance (HLB). The use of
nonionic surfactants, most of which are nontoxic and
biodegradable, is of particular interest for industrial
The particle size in emulsions determines their
stability in storage and the area of the contact surface
of the reactants. In curing, the mobility of
macromolecules is insufficient, and the contact with
the cross-linking agent can occur only at the boundary
of contact of component particles. The completeness of
cross-linking increases with an increase in the elastic
modulus of particles and with a decrease in their size.
Thus, the sufficient degree of dispersity of epoxy
resins in aqueous emulsions is the major requirement
to these systems .
It should be noted that emulsions of epoxy resins
cannot be used for preparing coatings without special
curing agents. In most cases, these are aqueous amine-
containing formulations. Specifically the chemical
composition and structure of curing agents largely
determine the properties of coatings.
In this study we examined the influence exerted by
the emulsifier and stabilizer concentrations on the