Dow Corning offers improved water
resistance for decorative coatings
Formulators of waterborne and solvent-based exterior architectural coatings can
now develop paints with improved water
resistance using only low levels of new sil-icone-based materials from Dow Corning.
Dow Corning 87 Additive and Dow
Corning 88 Additive create a hydrophobic silicone network in the paint that repels water but is permeable to water
vapor coming from the substrate. Even
when used at levels as low as two percent
by weight of the formulation, these additives improve the water repellency of coatings without causing cracking and
blistering, according to the firm.
Dow Corning 87 Additive is a silicone
resin emulsion designed for use in waterborne paints and is ideal for applications
where visual water beading is desired.
When water reduction is the primary requirement, Dow Corning 88 Additive, a
silane/siloxane blend, is effective and can
be used both in acrylic emulsion paints
containing polar solvents and in solvent-based systems. With access to these two
sustainable solutions, formulators can
leverage the technology for a wide range
of decorative coating products.
Evonik launches surfactant for
waterborne coatings
Evonik Goldschmidt Corp. has introduced Tego Twin 4100, a multi-functional, high surface activity surfactant
that delivers long-term foam stabilization,
compatibility with sensitive resins, and
improves flow and leveling. The reduction
in surface tension enables substrate wetting on difficult-to-wet substrates, with
the added benefit of an anti-crater effect.
Effective defoaming characteristics have
been demonstrated in a variety of waterborne formulations for plastics, wood
and metal.
Rutgers offers Novares LR 600
reactive modifier for high
performance epoxy coatings
Rutgers has launched a new aromatic mod-
ifier, Novares LR 600, which was developed
to improve technical and protective properties of epoxy-based systems. Novares LR
600 is reactive and is chemically built into
the epoxy network. Due to the chemical
bonding Novares LR 600 shows very low
tendency of migration. It is low viscous and
reduces the viscosity of epoxy-based systems.
SunGEM effect pigments
expanded for use in the
automotive industry
Sun Chemical Performance Pigments has
introduced weather resistant grades to its
SunGEM pearlescent effect pigment line,
making this latest extension of the product range applicable to the automotive industry and other exterior coatings
formulations. Automotive designers who
use SunGEM effect pigments can choose
from 10 pigment shades of high chroma
color and pearlescent luster. The product
range expands the realm of color and design by exhibiting deep tones, rich hues,
excellent opacity and exceptional sparkle,
along with magnetic alignment properties
that bring colorful three-dimensional effects to their coatings and end use applications, according to the company. The
SunGEM pearlescent effect pigments line
comes in 10 color shades including: Light
Silver, Gold/Taupe Interference, Orange,
Deep Violet, Rich Blue, Gold/Turquoise
Interference, Green, Rich Gold/Green Interference, Dark Silver and Cherry Red.
Dow Coating Materials
introduces Ecosure LF APEO-free pigment grind surfactant
Dow Coating Materials (DCM) has made
an addition to its product line of APEO-free
surfactants. Ecosurf LF Surfactants are low-foam, high-performance additives for pigment dispersion that offer excellent pigment
wetting and color acceptance, plus additional foam control through cloud point defoaming, according to the company. Cloud
point refers to the temperature at which
ethoxylate surfactants become insoluble in
an aqueous solution. Ecosurf LF Surfactants are initially soluble and offer excellent
wetting with low foam during pigment addition. As temperatures during pigment dispersion rise above cloud points, Ecosurf LF
Surfactants become insoluble.
Union Process manufactures
dry grinding attritor
Union Process, Inc. has built a specially designed attritor for a European customer
that manufactures raw materials for the ceramic industry. The 250SD dry grinding attritor features CE certification and is
powered by a specially engineered 150 HP
motor, which provides 425 percent starting
torque. The mill was designed specifically
for metal-free grinding. The grinding tank
is lined with ceramic tiles and the agitator
arms are sleeved with tungsten carbide. The
250SD attritor is designed to operate in
continuous mode, which allows for high
product throughput. Material is fed into the
attritor at the top, and is reduced in size as
it passes through the agitated media bed.
The finished ground product is discharged
through multiple specially designed dry
grind meter valves positioned at the bottom
of the tank. A dry-grind aid-metering pump
is also included with this mill. Final particle
size of the material can be controlled by
varying the feed and discharge rates.
Michem Guard 7140 improves
rub and abrasion resistance in
wood coatings
Michelman offers Michem Guard 7140, a
water-based, large particle emulsion that improves rub and abrasion resistance in pigmented coatings and semi-gloss coatings. It is
effective at very low addition rates of two to
five percent, making it an economic solution,
according to the company. It can also be
used to matte coatings and varnishes to a
smooth satin finish at five to ten percent addition rates. Michem Guard 7140 is typically
used in coatings that go on exterior wood
and wood composites, interior wood furniture and wood flooring. CW
