Technical presentation

Improve Water Resistance with

Rheology Additives

Add a drop of rheology to your paints and coatings

Improve Water Resistance with Coatex

Rheology Additives

China Coat

December 2014

Michelle Shen

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Water resistance: what are we talking about?

As a result of regulatory changes, new paint formulations are required to meet low-VOC regulations.

The reduction in VOC, the lack of coalescent aids are contributing factors to poor water resistance properties.

Water resistance of the film can be increase by the use of use specific binders and a lower pigment volume concentration (PVC) but also by the use of an efficient and hydrophobic dispersing agent.

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World leading designer and producer of waterborne Rheology Additives

Entirely dedicated to water based processes and formulations with minerals

More than 40 years of experience in Rheology

Coatex – Arkema group

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Coat、Ink、adhesive RHEOTECHTM, COAPURTM

VISCOATEXTM, ECODISTM

COADISTM

Paper

TOPSPERSETM, RHEOCOATTM

RHEOCARBTM

Construction

ETHACRYLTM, RHEALISTM

Detergent

RHEOSOLVETM

Our Brand

RHEOSPERSETM

Mineral process

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Content

Dispersing theory

Dispersant introduction

Case studies

Wrap up

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I. Pigment Dispersing Process

Wetting Dispersing Stabilizing

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ZETA Theory : Stabilization

Definition：

Particles surface were coverd with charges. These charges help to increase the

thickness of the double layer charge and the surface ZETA potential. Then bigger

repulsion will occur and result to better dispersion between particles.

Repulsion between particles

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Zeta high

excellent stability

Zeta low

Flocculation

Aggregate

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Steric and Ionic Dispersants

Ionic Dispersants Steric Dispersants

(comb polymers)

d

d

E

+

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+

+

+ d

E

dc

?

Repulsive energy between particles depends on the nature of the dispersant

In can long term pigment

stabilization

Prevents flocculation and

acceleration of settling

Maintains steric spacing and

best pigment positioning for

opacity until the latest phases

of film drying

dc

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Coadis™ and Ecodis™

Fillers Oxide

pigments

Coarse Fine

CaCO3 CLAY TiO2 ZnO Fe2O3

Ecodis™ P 90 Ammonium salt

Wa

ter

Re

sis

tan

ce

Ecodis™ P 30 Sodium salt

Organic pigment

Coadis™ 123 K Potassium salt

Coadis™ BR 3 Potassium salt

Gloss Matt Eggshell Satin Semi gloss

Coadis™ BR 85

+ -

Pigment Paste

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Case Studies

Interior wall paints PVC=40% ● Tinting strength

● Scrub resistance

● Stain resistance

Exterior wall paints PVC=60%

● Early water resistance

● Acid rain resistance

Exterior primer ● Alkali burnout and Salting out resistance

Coadis™ and Ecodis™, the right dispersant for every situation

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Amount/g

Ingredient Function Reference Coadis 123K

grinding Water Water 13.20 13.20

Biocide Biocide 0.17 0.17

AMP 95 pH adjuster 0.46 0.46

Dispersant1 Dispersant1 1.06 0.50

Coadis 123K Dispersant2 0.00 0.50

CF 246 defoamer 0.18 0.18

R996 pigment 17.60 17.60

CC-700 pigment 11.44 11.44

MXK-201 filler 11.44 11.44

Let down Texanol coalescent 1.06 1.06

Encor 662 emulsion 38.71 38.71

CF 246 defoamer 0.18 0.18

Water 水 3.65 3.15

Rheotech 3800 thickener 0.53 0.53

Coapur 2025 thickener 0.35 0.35

Total 100.00 100.00

PV

C=

40%

inte

rior w

all p

ain

t

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Color development

Test results

After finger rub up test, there is no color changing on the panel with 123K for the tested three color

ΔE of paint with 123 K are all lower than 0.5 which are better than that of reference paint.

Tinting strength of formulas with 123K is better than that of general salt dispersant.

Reference Coadis 123K

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Tinting Strength

Tinting Strength

96%

97%

98%

99%

100%

101%

102%

103%

104%

105%

106%

107%

Reference 123 K Reference 123 K Reference 123 K

Reference

123 K

Reference

123 K

Reference

123 K

Tinting strength of reference paint is 100% and as the std., higher than 100% is better and lower than 100% is worse.

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Stain Resistance

Basic processes:

Tests initial whiteness of panels marked as Y0.

Drops 5 liquid stains and brush 1 solid stain on the panels, after 2 hours, moves away stains by water and tissue.

Uses GB scrub machine and 2% washing powder solution as media, brushes 200 times and dries.

Tests whiteness of panels marked as Y1.

Anti stain resistance ability: X=Y1/Y0*100%.

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Scrub Resistance

Scrub resistance of 123K is much better than that of general salt dispersant.

Scrub resistance(ASTM,SC-II)

0

100

200

300

400

500

600

700

800

900

reference 123 K

123 K reference

64% PVC interior wall paint

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Amount/g

Ingredient Function Reference Coadis 123K

Grinding Water Water 19.00 19.00

Biocide Biocide 0.15 0.15

Dispersant Dispersant 1 0.60 0.00

Coadis 123K Dispersant 2 0.00 1.50

PG Anti Freeze-thaw

agent 1.60 1.60

Surfactant Surfactant 0.50 0.50

Texanol coalscent 1.50 1.50

CF 246 defoamer 0.40 0.40

R996 pigment 15.00 15.00

KTY-1 filler 8.00 8.00

MXK-201 filler 14.00 14.00

250HBR thickener 0.40 0.40

Let down pH adjuster pH adjuster 0.20 0.20

Water Water 9.05 8.15

Encor 2741 binder 21.00 21.00

Celocor Opaque polymer 8.00 8.00

CF 246 defoamer 0.40 0.40

Rheotech 3800 thickener 0.20 0.20

Total 100.00 100.00

60%

PV

C e

xte

rior w

all p

ain

t

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Color development

Coadis 123K reference

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Performance additives: Coadis™ dispersants

123K Reference

Early rain resistance

Not resistant Highly resistant

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Acid rain resistance Basic processes:

Prepare acid rain solution by nitric acid and sulfuric acid and keep pH value to 3.5.

Mix paint with 4% iron red and brush paint on cement panels with 200um film.

Put panel lying on the wall and drop acid rain solution on the panel for at least 40 times.

And then to find there is any difference on the panel.

123K Ammonium salt

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Tinting strength

Tinting Strength

80%

90%

100%

110%

120%

130%

Reference 123 K Reference 123 K Reference 123 K

Reference

123 K

Reference

123 K

Reference

123 K

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Exterior Primer PVC=40%

Amount/g

Ingredient Function Reference Coadis 123K

Grinding Water Water 20.00 20.00

LXE Biocide 0.10 0.10

Dispersant Dispersant 1 0.50 0.00

Coadis 123K Dispersant 2 0.00 0.80

AMP 95 pH adjuster 0.10 0.10

PG Anti Freeze-thaw

agent 1.99 1.99

Texanol Coalescent 2.30 2.30

CF 246 Defoamer 0.10 0.10

LF-45 Wetting 0.15 0.15

R996 Pigment 4.50 4.50

MS 800 Filler 26.00 26.00

250HBR Thickener 0.60 0.45

Let down Water Water 10.46 10.31

Encor 2470 Binder 33.00 33.00

CF 246 Defoamer 0.20 0.20

Total 100.00 100.00

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Alkali burnout and Salting out resistance

123K Ammonium salt Basic processes:

Brush 0.4 g PVA-iron blue solution on the primer, use paraffin to band the edge.

Put the cement panels into the alkali and salt resistance solution, and solution would not exceed the surface of primer.

After 24hs, to observe the surface of panel, if the iron blue doesn’t turn from blue to white, it is called “no abnormality”.

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Trim paint

Amount/g

Ingredient Function Reference Coadis 123K

Grinding Water Water 49.0 49.0

Reference Dispersant1 3.0

CODIS 123K Dispersant2 7.0

BYK-025 Defoamer 2.0 2.0

R960 Pigment 170.0 170.0

Let down SNAP 2142 Emulsion 570.0 570.0

Rocima 640 Biocide 5.0 5.0

AMP-95 pH adjuster 5.0 5.0

BYK-025 Defoamer 1.0 1.0

texanol Coalescent 13.0 13.0

Water Water 157.0 153.0

Rheotech 3800 Thickener 6.0 6.0

Rheotech 2000 Thickener 19.0 19.0

Total 1000.0 1000.0

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gloss

20° 60° 85° block resistance water resistance

CODIS 123K 34.0 73.9 93.9 A-0 good

ECODIS P90 19.2 65.9 92.0 A-0 good

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Coadis 123 other application

Wood coating

Muti-color paint

Industrial paint

….

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Conclusion

The different concerns linked to water resistance

Scrub resistance

Snail traces

Washability Easy to clean

Early rain resistance

Extending painting season

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Conclusion

How to improve water resistance?

Improve hydrophobicity

Optimize pigment dispersion

by using an efficient and hydrophobic dispersing agent Coadis™ 123 K

Improve the surface of the film

Increase water repellency

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Let’s visit us at the Arkema booth (n°10.2B25-40)

for technical discussions and exchanges.

Chinacoat

December 2014

Thank you for your attention!