PRODUCTS FINISHING — PFonline.com
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differences, each provides its own
specific set of characteristics to the
finished product.
Water-emulsion coatings
contain circular-shaped particles
that have a high molecular weight
when dispersed in water. This
increase in molecular weight
provides improved performance
without having an adverse affect
on viscosity. Of the three types
of waterborne formulations,
water-emulsion coatings offer
the most durable coating prop-
erties, including good chemical
and water resistance. Advances in
water-emulsion technology, and
the addition of modified resins and
additives also have produced good
corrosion resistance. These newer
water emulsion coatings also offer
faster cure times, longer pot life,
improved resistance to yellowing,
enhanced application properties
and better gloss retention. With
these capabilities, water-emulsions
have been a popular choice for the
automotive and business-machine
industries.
Water-soluble coatings are
different from water-emulsion
coatings in that the spherical parti-
cles in these formulations (called
colloidal dispersion polymers)
are smaller and swell in water.
Colloidal-dispersion polymers
have characteristics of both emul-
sions and solutions, resulting in a
coating that is easy to apply and
provides good gloss and durability,
as well as water and chemical resis-
tance. Because of these benefits,
water-solubles are most often
specified for industrial product
finishing applications.
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