Formulating novel aqueous epoxy(气体）

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Two component, waterbased epoxy coatings can
be classified by the type of epoxy resin employed.
Low molecular weight, liquid epoxy systems are
commonly referred to as Type I, whereas systems
based on higher molecular weight, solid epoxy
dispersions are referred to as Type II.  This paper
will focus on coatings based on both types of
resins.
In the first case, novel curing agent technology for
use with liquid epoxy resins will be discussed.
Benefits of this technology include formation of
high performance, zero VOC coatings, with a visible
end to the pot life and excellent anti-corrosive
properties.  More recently a new  Type II  epoxy
technology has been developed, this technology
offers the unique combination of good film
formation while also providing the option of zero
VOC formulations.
Coatings formulated with this new resin exhibit
properties on metal substrates that are equal in
performance to conventional solvent based
systems.  Advantages include rapid lacquer dry,
fast development of early water resistance and a
long pot life.  Performance properties of both
technologies will be reviewed.
Introduction
Waterborne epoxy coatings have evolved into two
fundamentally different technologies commonly
identified as Type I and Type II systems1
. Type I
systems are based on liquid bisphenol A/F epoxy
resins, with an EEW <250.  The amine curing agent
serves as the emulsifier for the epoxy resin and
the emulsion, which contains both epoxy resin and
amine is readily formed when the two components
of the paint are mixed together.

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http://www.airproducts.com/NR/rd ... l_aqueous_epoxy.pdf