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- Additives: Dispersants
(Ecodis™ P 90, Ecodis™ P 30 + Coadis™ 123 K)
- Application: Water-based matt & flat paints
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> Key Benefits
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Less TiO2 usage
- Better optical properties
- Enhanced storage stability
- Improved opacity and tint strength
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The Challenge
Paints and coatings formulators are struggling with TiO2 pricing. But the main concerns are the availability and getting the best of involved quantity.
In order to anticipate and solve these issues, finding an alternative is crucial for formulators so that their developments won't be impacted.
The Solution
Based on 40 years of expertise Coatex has designed dispersing agents to help formulators achieving better level of performance in their waterbased formulations.
Ecodis™ and Coadis™ dispersants enable the optimization of TiO2 through 2 technologies:
Co-dispersion of TiO2 spaced with filler particles
Below on the left side: smaller sized extender particles particles improve TiO2 spacing effect thanks to super dispersant action.
Below on the right side: due to reduced particle size PVC and solids content are increased, in addition Ecodis™ P 90 clearly improves the storage stability and maintains opacity even in hard conditions.
Figure 1: Reproduction of the TiO2 spacer effect with filler particles |
| Weight(g) |
Control |
Paint with Ecodis™dispersant |
|
Water |
259.0 |
252.5 |
Acrylic Dispersion (40%)
Phosphate based dispersant
ECODIS™ P 90 (40%) |
5.0
1.5
0.0 |
0.0
0.0
5.0 |
|
Binder |
200.0 |
200.0 |
Rutile TIO2
CaCO3 fine extender
CaCO3 1 µm
CaCO3 6 µm |
110.0
0.0
200.0
180.0 |
95.0
248.0
0.0
180.0 |
|
Other |
44.5 |
44.5 |
| Total(g) |
1000.0 |
1025.0 |
|
PVC% |
64.5 |
66.3 |
|
Solid Content % (weight) |
60.2 |
62.0 |
Table 1: 65% PVC matt paint reformulation based on 20% of
styrene acrylic binder with and without dispersant Ecodis™ P 90 |
The reformulation of a 65% PVC matt paint shows that using Ecodis™ P 90 as unique dispersant + fine extenders enables:
- Better performance compared with the control
- opacity is maintained
- storage stability is improved
- total paint weight and volume can be increased
- A significant increase of PVC and solids content
- by increasing extenders and water amounts
- by reducing by 14% the TiO2 needed
Co-dispersant solution for fine tune balance between ionic & steric dispersing effect
Below on the left side: stable formulations, storage stability and longer shelf life are ensured thanks to well dispersed, sterically protected and ionically stabilized mineral particles.
Below on the right side: Coatex dispersing agents demonstrate higher performance as opacity, tint strength and optical properties are improved.
Figure 2: Demonstration of how the dispersion process allows to get separation against Van der Waals forces and stabilization against weight |
| |
Control |
Formula with Coatex dispersants |
Dispersant |
Benchmark on the market |
Ecodis™P 30 Coadis™123 K |
lbs |
11 |
5.55 2.2 |
%Rutile TIO2 slurry |
100 |
90 |
Opacity |
96.25 |
99.58 |
| |
100% |
100% |
| Wet-to-dry hiding (opacity value) |
Black hiding |
+0.21 |
-0.47 |
White hiding |
+0.09 |
-0.75 |
Table 2: 50 VOC flat interior paint formulation with and without the use of Coatex system of dispersants (Ecodis™ P 30 + Coadis™ 123 K) |
In a 50 VOC flat white interior paint, by replacing the dispersing agent by a co-dispersant approach (Ecodis™ P 30 + Coadis™ 123 K), you are able to:
- Achieve equal rheology properties and improved opacity and tint strength
- Reduce the TiO2 level by 10% and still offer better or equal optical properties versus control paint
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