Product Overview
SHP SERIES?
Opaque polymers are non-film-forming synthetic pigments engineered
to provide dry hiding in water-based coatings.
They consist of spherical styrene/acrylic beads supplied as emulsions.
In wet paints the beads are filled with water. As the paints dry, water permanently
diffuses from the center of the beads and is replaced by air, resulting in discrete
encapsulated air voids uniformly dispersed throughout the dry paint film.
The encapsulated air voids provide optimal hiding when the paint film dries and
light is scattered as it passes from the exterior of the beads to the interior micro
voids.
Properties
The use of SHP SERIES opaque polymer can have a beneficial impact on
the performance properties of both interior and exterior paints. Substituting
opaque polymer for some of the titanium dioxide and pigment extender in an
interior paint makes it less vulnerable to damage from cleaning
(see Interior Scrub Panel).
In an exterior paint, on the other hand, exchanging opaque polymer for a
portion of nondurable pigment extender such as calcium carbonate can
improve durability (see Exterior Exposure Panel).
Interior Scrub Panel
The use of SHP SERIES? Opaque polymer in paints formulated above the
critical pigment volume content (CPVC) level significantly improves their
wash ability.
The panel above contains two versions of a high-PVC paint,
one conventionally extended (left), the other made with SHP SERIES
opaque polymer (right).
When cheesecloth dipped in either water or a household cleaner is rubbed
back and forth across the panel to simulate washing, the conventionally
pigmented paint is abraded; its SHP SERIES opaque polymer counterpart
remains intact.
Exterior Exposure Panel
The use of SHP SERIES?
Opaque polymer can significantly improve paint durability in cases where
the extenders are not durable. Even in paints containing durable extenders,
SHP SERIES opaque polymer can help improve durability.
The panels above contain conventionally pigmented (left side) and opaque
polymer (right side) versions of a flat paint.
The formulations on the top panel contain Minex 4 nepheline syenite,
a durable extender; those on the bottom, a clay.
The opaque polymer version on the bottom panel retains its color
significantly better because the opaque polymer is more durable than
the clay it replaced.
Even in the more durable formulations on the top panel, the paint
containing opaque polymer shows better color retention.
Formulation guide
BASIC PROTOCOL
1.Reduce 5 PVC of Titanium dioxide
2.Add Opaque Polymer (SHP-40, SHP-60) 4 times
Titanium dioxide PVC reduction
3.Increase total PVC
4.Decrease Extender proportionally or Remove
5.Remove a small amount of binder
(Solid volume of paint should be remained constant)
6.Adjust coalescent and dispersant level
7.Fine tune to the desired properties
INTERIOR FLAT PAINT Guide Formulation
|
|
Control paint |
SHP-40 Modified paint |
|
Paint PVC |
65 |
68.3 |
|
TiO2 PVC |
20 |
14.4 |
|
Extender PVC |
45 |
40.5 |
|
SHP-40 PVC |
- |
13.4 |
|
Hiding power |
0.985 |
0.986 |
|
Washability |
Above 800cycle |
Above 1000cycle |
|
RMC($)/liter |
2.6 |
2.34 |
|
Cost Saving (%) |
Control |
10% |
|
TiO2 PVC reduction |
Control |
5.6 |
INTERIOR SEMI GLOSS PAINT Guide Formulation
|
|
Control paint |
SHP-40 Modified paint |
|
Paint PVC |
29.0 |
34.0 |
|
TiO2 PVC |
26.0 |
21.0 |
|
Extender PVC |
3.0 |
- |
|
SHP-40 PVC |
- |
13.0 |
|
Hiding power |
0.988 |
0.987 |
|
Washability |
Above 2000cycle |
Above 2000cycle |
|
RMC($)/liter |
3.2 |
2.90 |
|
Cost Saving (%) |
Control |
10% |
|
TiO2 PVC reduction |
Control |
5.0 |
Applications
- Exterior Flat Paint
- Interior Flat Paint
- Gloss Paint
- Semi Gloss Paint
Properties
- Reducing Raw Material Cost in latex paint
- Reinforcing Film integrity properties in latex paint
- Improving gloss
Background of the plastic pigment
It is well-known in paint industry that the so-called plastic pigment has
played an important role to reduce the cost of high quality water-borne
paints without sacrificing performance by replacing part of titanium dioxide
which has been mainly used as a white pigment.
In general, the methods to increase the hiding power of paint film can be
divided into two categories ; one is based on the use of the open cell of
microvoids and the other is based on the use of the closed cell of microvoids.
The typical example of utilizing microvoids open cell type may be seen in
the water-borne paint of low cost and low quality. In which the pigment
volume concentration of the paints is formulated above critical pigment
volume concentration by highly loading the so-called extender and hence
the hiding power of the paint film is increased by the formation of
interfaces between pigment and air instead of interfaces between pigment
and binder.
Regardless of the increased hiding efficiency, this method suffers from
inferior gloss and relatively poor resistances to water, soap solution and
stain because of the presence of the inter -connected large voids in the
dried film In order to overcome the problems mentioned above, fine non-film
forming emulsion polymer whose glass transition temperature is above 90
and has particle size is below 1.0 micron, e.g. polystyrene latexes, is
formulated into the water-borne paint to reduce the size and quantity of
continuous voids and to improve water resistance and washability with
the help of the coalescing solvent added to partly sinter the non-film
forming particles.
However, this method and suffers from the fact that the hiding power of
the paint films can not be maximized because of the lack of ability to scatter
light ray by the emulsion polymer particles which has almost same reflective
index as that of film-forming latex binder In recent years in order to overcome
the problems mentioned previously a new preparation method has been
developed where microvoid-containing polymer particles.
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