arkema coatex presentation coadis 123 k hidrophobic dispersant.pdf
TRANSCRIPT
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Possibilities offered by a unique hydrophobic dispersant
Add drops of vitamins to your formulations
European Coatings Show NrembergApril 2015
Dr. Denis Ruhlmann
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Unique hydrophobic dispersant
water resistance and much more
New paint formulations are required to meet low-VOC or 0-VOC regulations.
Associated risks are loosing in terms of film resistance against wet scrub, stain, earlyrain, acid, alkali burn out
Possible impact on paint properties such as color acceptance and glossdevelopment
Such issues can be addressed thanks to the use of an efficient and hydrophobicdispersing agent.
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Content
Dispersing theory
Dispersant introduction
Case studies
Wrap up
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Steric and Ionic Dispersants
Ionic Dispersants Steric Dispersants(comb polymers)
d
d
E
+
+
+
+
+
+
+d
E
dc
?
Repulsive energy between particles depends on the nature of the dispersant
In can long term pigment stabilizationPrevents flocculation andacceleration of settling
Maintains steric spacing and bestpigment positioning for opacity untilthe latest phases of film drying
dc
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Dispersing technologies
FillersOxide
pigments
Coarse Fine
CaCO3 CLAY TiO2 ZnO Fe2O3
Ecodis P 90Ammonium salt
WaterResistance
Ecodis P 50Sodium salt
Ecodis P 30Sodium salt
Organicpigment
Coadis 123 KPotassium salt
Coadis BR 3Potassium salt
GlossMatt Eggshell Satin Semi gloss
Coadis BR 85
+
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PigmentPaste
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Case Studies
Interior wall paints PVC=40% Scrub resistance
Stain resistance
Tint strength
Exterior wall paints PVC=60% Early water resistance
Acid rain resistance
Tint strength
Exterior primer
Alkali burnout and Salting out resistance
High gloss alkyd emulsion paints
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Ingredient Reference Coadis 123 K
Millbase
Water 132 132
Biocide 1,7 1,7
Neutralizing agent 4,6 4,6Polyacrylate dispersant 10,6 5
Coadis 123 K 0 5
Defoamer 1,8 1,8
Rutile TiO2 176 176
CaCO3 114,4 114,4
Calcined clay 114,4 114,4
Letdown
Texanol 10,6 10,6
Encor 662 (styrene acrylic) 387 387
Defoamer 1,8 1,8
Water 36,3 36,9
Rheotech 3800 5,3 5,3
Coapur 3025 3,5 3,5
Total 1000 1000
PVC=40% interior wall paint
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The scrub resistance obtained with Coadis 123 K is much higher thanwith the current polyacrylate
0
500
1000
1500
2000
reference Coadis 123 K Coadis 123 Kreference
PVC=40% interior wall paint
Scrub Resistance
1600 cycles
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Hydrophilic dispersant : Water
easily penetrates into the paintfilm
Poor scrub resistance
Water + detergent
Binder
Substrate
Water + detergent
Binder
Substrate
Hydrophobicbarrier
Hydrophobic dispersant : Water stays
at the paint film surface
Better scrub resistance
PVC=40% interior wall paint
Scrub Resistance
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5 liquid stains drops and 1 brushed solid stain are applied on the panels
After 2 hours, they are moved away by water rinsing and by tissue absorption
Using a scrub machine and 2% of washing powder solution, panels are brushed 200 timesand dried
Anti stain resistance is expressed as a score
PVC=40% interior wall paint
Scrub Resistance
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96%
98%
100%
102%
104%
106%
108%
Reference 123 K Reference 123 K Reference 123 K
Tinting strength of reference paint is set at 100%.
Higher than 100% means a higher tint strength
Red pigment
Blue pigmentBlack pigment
PVC=40% interior wall paint
Tint Strength
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No color change after finger rubup with Coadis 123 K for the
tested three color,
E of paint with Coadis 123 Kall lower than 0.5,
Tinting strength of formulas with
Coadis 123 K is better.
Reference Coadis 123 K
PVC=40% interior wall paint
Tint Strength
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Ingredient ReferenceCoadis 123 Kuse
Millbase
Water 190 181
Biocide 1,5 1,5
Polyacrylic dispersant 6 0Coadis 123 K 0 15
Propylene glycol 16 16
Surfactant 5 5
Texanol 15 15
Defoamer 4 4
Rutile TiO2 150 150Hydreous clay 80 80
Calcined clay 140 140
HEC 4 4
Letdow
n
Neutralizing agent 2 2
Water 90,5 90,5
Encor 2741 (acrylic) 210 210Celocor 80 80
Defoamer 4 4
Rheotech 3800 2 2
Total 1000 1000
60% PVC exterior wall paint
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1 - White paint is applied on a black surface
2 wait 30 minutes
3 - Water is sprayed on the fresh coating
60% PVC exterior wall paint
Early rain resistance
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With Coadis 123 KReference with
polyacrylate
Not resistantResistant
60% PVC exterior wall paint
Early rain resistance
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Experimental
Acid rain solutionmade of nitric acidand sulfuric acid for apH value of 3.5
Paint tinted with 4%of iron red and
applied on cementpanels at 200 m wet
Panel held verticallyand poured with acidrain solution 40 times
Note visual differencebetween panels
Coadis 123 K Ammonium polyacrylate
60% PVC exterior wall paint
Acid rain resistance
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80%
90%
100%
110%
120%
130%
Reference 123 K Reference 123 K Reference 123 K
Coadis 123 K reference
Red pigment
Blue pigment
Black pigment
60% PVC exterior wall paint
Tint strength
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Ingredient ReferenceCoadis 123 Kuse
M
illbase
Water 200 197
Biocide 1 1Polyacrylic dispersant 5 0
Coadis 123 K 0 8
Neutralizing agent 1 1
Propylene glycol 20 20
Texanol 23 23
Defoamer 1 1
Surfactant 1,5 1,5
Rutile TiO2 45 45
Talc 260 260
HEC 6 6
Letdow
n Water 104,5 104,5
Encor 2740 (styrene acrylic) 330 330
Defoamer 2 2
Total 1000 1000
Exterior Primer PVC=40%
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Coadis 123 K
Experimental
0.4 g of 2% PVA/iron bluesolution is brushed on the
primer, paraffin is used to sealto edges
Coated cement panels aredipped into a blend made of 2%
NaOH water solution (alkalinesolution) and a salt solutionmade of Na2SO4 / NaCl / water(5:10:85)
After 24 hours, theappearance of the surface isexamined to detect any ironblue area having turned white,what would characterize a weak
resistance
Exterior Primer PVC=40%
Alkali burnout and Salting out resistanceAmmonium salt
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Ingredient
Millbase
Water 68,6 62,8
Multipurpose dispersant (40%) 8,8 /
Coadis 123 K (24%) / 14,6Biocide 2 2
Neutralizing agent 0,5 0,5
Coapur XS 22 (25%) 35 35
Defoamer 2 2
Rutile TiO2 265 265
LetdownSynaqua 4804 615 615Water based drier 3,1 3,1
Total (g) 1000 1000
Leveling (ASTM D4062) 9 9
Sag resistance (ASTM D4400) 10 10
Gloss after 3 days
20 89.5 89.0
60 95.0 95.8
High gloss alkyd emulsion paint
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Conclusion
The different possibilities offered by the unique hydrophobicdispersant Coadis 123 K
Stain resistance
Surfactant leaching
Scrub resistance
Acid and alkali resistance
Early rain resistance
Extending painting season
Gloss
Color acceptance
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Thanks for your attention
and for your questions
Visit us on the Arkema booth 328 Hall 4A