ZEOCROS CG180A HIGH PERFORMANCE

TiO2 EXTENDER

Zeocros CG180 is a unique zeolite (alumino-silicate) exclusive to PQ Corporation. Through particle engineering we havebeen able to control its particle size, morphology and molecular framework. The jagged angular shape of Zeocros CG180, itsfine particle size and tight particle size distribution helps scatter light efficiently, making it a high performance, costeffective extender for titanium dioxide.

BENEFITS OF ZEOCROS CG180 FOR TiO2 EXTENSION:

Good optical properties:High opacity attributable to small particle size and jagged angular shape, high whiteness of product results in little or no impact on whiteness of final coating.

Fine particle size:Low gloss reduction (due to poor matting efficiency of small particles). Suitable for use with thin films.

Low oil absorption: Lower binder demand.

High hydrophilicity:Aids ease of dispersion.

pH buffers:Allows the replacement of ammonia or caustic soda, thus reducing exposure to toxic gases/corrosive liquids.

Low specific gravity:Results in lower paint density, offering further cost savings.

Ion exchange properties:Allows the replacement of water softening agents.

ZEOCROS CG180 -A HIGH PERFORMANCE TiO2 EXTENDER

Proposed mechanism for TiO2 extension Typical properties of Zeocros CG180

Average particle size, microns (Sedigraph) 1.2

Colour (Harrison Reflectometer), % 99

pH (5% aqueous suspension) 11.2

Specific gravity, g/ml 2

Oil absorption (Linseed), g/100g 60

Anhydrous solids content, % 90

Hegman gauge, microns 2

Mohs hardness 2-3

A

a) Calcium carbonate b) Titanium dioxide c) Zeocros CG180

B

C

2

WATER BASED PAINT

Zeocros CG180’s small particle size allows cost effective extension in water based paints.

A low cost matt emulsion paint (Formulation 1) has been used to demonstrate the effectiveness of Zeocros CG180 as aTiO2 extender. 10, 20 and 30% respectively of the weight of TiO2 was replaced by Zeocros, and the resulting formulationstested for wet and dry properties (see Table 1).

The replacement of TiO2 with Zeocros CG180 does not significantly affect the opacity of the film or its colour. It was alsoobserved that the scrub resistance of the film dried for 28 days showed a marked improvement at all replacement levels.

*PVC: Pigment volume concentrationa) Coatex b) BK Ladenburg c) Riedel-de-Haen d) Clariant e) Tego Chemie f) Omya g) Mondo Minerals Org Helsinki h) Millenium

*125µm Wet Film Thickness (WFT) ‡Brookfield, Spindle 6, 100rpm

Formulation 1. TiO2 = 4% *PVC = 75%

Water Omyalite 90f (calcium carbonate)

%

17

%

36.1

Coatex PE650a (dispersant) Omyacarb 2 GUf (calcium carbonate) 200.2

Calgon Nb (water softener) Finntalc M 30g (talc) 100.05

Mergal K6Nc (bactericide) Tiona RCL-535h (titanium dioxide) 40.2

Tylose MH 30000 Yd (cellulosic thickener) NaOH 10% 0.20.35

Coatex PE 625a (dispersant) Mowlith LDM 1871d (polymer emulsion) 11.50.3

Foamex KSe (antifoam) 0.1

Table 1. Replacement of TiO2 by Zeocros CG180 in Formulation 1 (low cost matt emulsion)

Reference

% TiO2 Replacement

93.9

Contrast Ratio (%)*

87.3

Whiteness

5.4

Yellowness

4130

10% 93.5 87.2 5.4 4470

20% 93.8 87.0 5.5 4230

30% 94.8 87.1 5.5 4340

Viscosity (cps)‡

Formulation 2. TiO2 = 13.6% PVC = 62%

Water China clay

%

8.8

%

30.1

Bactericide Calcium carbonate 7.50.1

Antifoam Monopropylene glycol 1.00.14

Cellulose Texanol 1.40.54

Dispersant Ammonia (0.89) 0.140.25

Ammonia (0.89) Polymer emulsion 16.90.05

TiO2 Opaque polymer 8.713.6

Talc Acrylic thickener 0.510.4

3

*on B/W card, 80µm WFT #100µm WFT ‡ICI cone and plate viscometer, 750rpm

a) Cray Valley

Table 2. Replacement of TiO2 by Zeocros CG180 in Formulation 2

Reference

% TiO2 Replacement

97.2

Contrast Ratio (%)*

83.9

Whiteness#

2.8

10% 96.4 83.5 1.8

20% 96.3 83.5 1.7

20% (+thicker) 97.2 83.2 2.7

30% 96.2 83.4 1.7

Viscosity (poise)‡

Zeocros CG180 has also been used to replace 10, 20 and 30% by weight of TiO2 in a matt emulsion system containing13.6% TiO2 (Formulation 2). The replacement results in a decrease in the high shear viscosity as well as a slight drop inopacity. However on adjustment of the viscosity back to the reference level, by the addition of a thickener, the opacity of the film increases to that of the reference (see Table 2).

A comparison in the scrub resistance of the reference formulation with the ‘20% Zeocros’ and the ‘20% Zeocros withoutammonia’ formulations resulted in the expected increase in performance.

SOLVENT BASED PAINT

Zeocros CG180’s small particle size allows cost effective extension in solvent based paints (see Formulation 3).

Formulation 3. TiO2 = 30%

White spirit 16% Zirconium drier

%

0.36

%

14.53

Synolac 60Wa (alkyd resin) 10% Calcium drier 0.7553.90

TiO2 M.E. Ketoxime 0.1030.20

12% Cobalt drier 0.16

#120µm WFT

Table 3. Replacement of TiO2 by Zeocros CG180 in Formulation 3 (a solvent based paint)

Reference

% TiO2 Replacement

99.7

Contrast Ratio (%)*

97.48

L*

-0.71

a*

3.27

10% 99.3 97.83 -0.76 3.92

20% 99.0 97.30 -0.77 3.87

30% 99.0 97.13 -0.82 3.81

b*

4

RECOMMENDATIONS

PQ Corporation recommend Zeocros CG180 as a cost-effective extender for titanium dioxide in emulsion paint formulations.The benefits of this product have been demonstrated in matt emulsion formulations for interior application where areplacement of up to 30% in weight of TiO2 with Zeocros CG180 results in no loss of opacity or whiteness. Alongside itsgood optical characteristics the product’s buffering properties allow the omission of ammonia or caustic soda from theformulation. Improvements in scrub resistance have also been observed in some formulations.

In silk and semi-gloss emulsion formulations Zeocros CG180 can be used as both a TiO2 dioxide extender and pH buffer.Some reformulation may be necessary to allow for gloss adjustment.

Zeocros CG180 can replace up to 30% of TiO2 by weight in solvent based paints with minimal influence on opacity andcolour. Partial reformulation (omission of matting agent) may be necessary for gloss adjustment.

PIGMENT PASTES

Zeocros CG180 can also be used to replace titanium dioxide in pigment concentrates/pastes. Please contact us if youwould like further information.

HEALTH & SAFETY

Material Safety Data Sheets providing detailed toxicological and handling information on all products including Zeocros CG180 are available upon request.

5

September 2008 PQ102-1

ZEOCROS® is a registered trademark

TECHNICAL SERVICEPQ Corporation offers a high standard of technical and analytical service to ensure optimum performance of its products.For assistance, contact us via e-mail: techsupport@pqcorp.com

All information contained in this publication is believed to be accurate and is given in good faith. PQ Corporation would be very pleased to co-operate with organisations who wish to explore further anyresulting possibilities. However, readers must satisfy themselves as to the suitability of such information for their own particular purpose. This applies equally to recommendations or suggestions madeby PQ Corporation relating to the use of information from this publication or offered in response to specific enquiries or otherwise. No warranty is given as to the fitness of the information for anyparticular purpose and any implied warranty or condition (statutory or otherwise) is excluded except insofar as such exclusion is prevented by law. PQ Corporation accepts no liability for loss or damage(including liability for negligence or other tortuous act or omission) other than that causing death or personal injury arising from reliance on the information provided. Freedom from patent, copyright ordesign protection must not be assumed.

For further information please contact:

www.pqcorp.com

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