Download pdf - ARKEMA COATEX Presentation COADIS 123 K Hidrophobic dispersant.pdf

7/24/2019 ARKEMA COATEX Presentation COADIS 123 K Hidrophobic dispersant.pdf

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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

+

-

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


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


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


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


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


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


Early rain resistance


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With Coadis 123 KReference with

polyacrylate

Not resistantResistant




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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


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


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


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