TS 720 Application Guide Cab O Sil Fumed Silica In Epoxy Coatings

User Manual: TS-720

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APPLICATION GUIDE
FUMED METAL OXIDES
PRODUCT PERFORMANCE
CABOT PRODUCT OFFERING
Material
Category
CAB-O-SIL
Fumed Silica
Products
Typical
Surface Area
m2/gram
Treatment
Agent Product Characteristics
Hydrophobic
Fumed Silica
TS-720 120
PDMS
CAB-O-SIL TS-720 and TS-710 fumed silicas should be considered for use
in highly polar resin systems. TS-710 fumed silica is somewhat easier to
disperse than TS-720 fumed silica, but delivers lower thickening efficiency.
TS-710 100
TS-610 125 DiMeDi
CAB-O-SIL TS-610 fumed silica should be considered for use in both polar
and non-polar resin systems, especially when ease of dispersion is a
primary formulation consideration.
TS-530 225 HMDZ CAB-O-SIL TS-530 fumed silica should be considered for use as a rheology
control additive in moderately polar resin systems.
Hydrophilic
Fumed Silica M-5 200 N/A
CAB-O-SIL M-5 fumed silica should be considered for use as a rheology
control additive in all resin systems, when hydrophobicity and shelf stability
are of only moderate concern. Other hydrophilic grades may also be used.
Epoxy Coatings that Can Use CAB-O-SIL Fumed Silica Include:
MARINE PRIMERS HEAVY MAINTENANCE COATINGS
LIGHT INDUSTRIAL COATINGS
Application Description
Formulating an epoxy-based coating that delivers protection from corrosion and mechanical stress requires a complex
combination of resins, additives, solvents, and pigments. Formulators are forced to make tradeoffs among rheological
performance, adhesion, corrosion resistance, aesthetic properties, and cost of the final formulation.
CAB-O-SIL fumed silica can help to break these trade-offs by providing sag resistance, anti-settling, anti-corrosive performance,
shelf stability and mechanical reinforcement in epoxy coatings.
In epoxy coatings, achieving excellent sag
resistance and anti-settling performance from a
rheology control additive is desired. CAB-O-SIL
fumed silica also improves resistance to
environmental factors, especially water, humidity,
and corrosion resistance. CAB-O-SIL fumed silica
further provides mechanical reinforcement and
can improve film toughness.
CAB-O-SIL® FUMED SILICA
IN EPOXY COATINGS
Higher
Fumed Silica
Anti-sag/
Anti-settling Effect
Environmental Resistance Improvements
Higher
M-5
TS-610
TS-530
TS-720
TS-710
Surface area measured by BET of product as sold. The data in the table above are typical test values intended as guidance only, and are not product specifications.
Product specifications are available from your Cabot representative.
cabotcorp.com
R02 01/14 ©2013-2014 Cabot Corporation
Technical Support
North America: 1 800 462 2313
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Europe: +31 71 888 4132
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CAB-O-SIL and REGAL are registered trademarks of Cabot Corporation. BYK is a registered trademark of Byk-Chemie GmbH. Dispermat is a
registered trademark of VMA-Getzmann GmbH Verfahrentechnik. Eiger is a registered trademark of Eiger Torrance Limited. Epon and Epikure
are trademarks of Momentive Specialty Chemicals, Inc. Surfynol is a registered trademark of Air Products and Chemicals Inc.
The data and conclusions contained herein are based on work believed to be reliable, however, Cabot cannot and does not guarantee
that similar results and/or conclusions will be obtained by others. This information is provided as a convenience and for informational
purposes only. No guarantee or warranty as to this information, or any product to which it relates, is given or implied. This information
may contain inaccuracies, errors or omissions and CABOT DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED, INCLUDING
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AS TO (i) SUCH INFORMATION, (ii) ANY PRODUCT OR (iii) INTELLECTUAL
PROPERTY INFRINGEMENT. In no event is Cabot responsible for, and Cabot does not accept and hereby disclaims liability for, any
damages whatsoever in connection with the use of or reliance on this information or any product to which it relates.
CAB-O-SIL® FUMED SILICA
IN EPOXY COATINGS APPLICATION GUIDE
Part A
Product Name Description Amount (%)
Epon 828 Epoxy resin 50.97
Propylene Glycol Ether Co-solvent 20.66
BYK® 348 Wetting agent 0.58
Surfynol® 104DPM Wetting agent 1.35
Dipropylene Glycol Normal Butyl Ether Co-solvent 8.34
REGAL® R400R Black pigment 1.16
CAB-O-SIL Fumed Silica 2.23
Epon 828 Epoxy resin 14.71
Total % 100.00
Part B
Epikure® 3292-FX-60 Curing agent 39.15
Part A Dispersion 60.85
Total % 100.00
1. Premix
a. Premix the Epon 828 epoxy resin (50.97%), Propylene Glycol Ether, BYK
348 wetting agent, Surfynol 104DPM wetting agent, and Dipropylene
Glycol Normal Butyl Ether together under good agitation, mix for 5 minutes.
b. Add REGAL 400R carbon black followed by CAB-O-SIL fumed silica under
good agitation, mix for 5 minutes at 4000RPM.
2. Milling
a. Mill the above in a horizontal mill for 5 minutes at 10 m/s tip speed.
b. After 5 minutes milling, add the rest of Epon 828 epoxy resin (14.71%) into
the mill then collect the dispersion (part A).
c. Measure viscosity and solids content.
3. Finish
a Premix part A and Epikure 3292-FX-60 curing agent under agitation for 15
minutes.
b. Discharge the premix, wait 15 minutes for the foam to break then apply.
Recommended Equipment
Premix
– Dispermat high speed mixer
– Maximum speed: 4000 RPM
– Blade: 3 cm Cowles-type
Milling
– Eiger Horizontal mill
– Maximum speed: 10 m/s tip speed
– Media: 1.0 mm Yttrium Stabilized Zirconia (YTZ)
Rheology Control
CAB-O-SIL TS-720 fumed silica delivers an ideal rheological profile. At low shear, the model epoxy formulation exhibits high viscosity, which prevents
pigment settling and promotes excellent sag resistance. Under high shear conditions, such as mixing, spraying, or rolling, model formulations
incorporating CAB-O-SIL TS-720 fumed silica exhibit low viscosity, facilitating application of the coating.
Enhanced Protection
The addition of a hydrophobic silica particle improves the mechanical strength of the coating and enhances the coating’s ability to repel water.
Adding CAB-O-SIL TS-720 fumed silica increases
hardness to the point where the coating
withstands a 6H pencil versus a 5H pencil for
the neat epoxy control. This increase in hardness
can be attributed to the presence of silica
particles on the surface of the cured coating
and the network that they form within it.
Incorporating CAB-O-SIL TS-720
into a 1.5 mil dry film coating
inhibits blistering after 400
hours of salt spray corrosion
testing. The hydrophobicity of
CAB-O-SIL TS-720 fumed silica
inhibits water from penetrating
the coating and reacting with
the substrate.
Formulation Formulation Processing
PRODUCT PERFORMANCE
MODEL FORMULATION The epoxy formulation below represents a typical simple black pigmented epoxy industrial coating.
CAB-O-SIL TS-720 fumed silica allows the
liquid coating to retain its vertical edge
CAB-O-SIL TS-720 fumed silica retards
pigments from settling when at rest
Sag Resistance
Reduced Blistering
Shear Thinning EffectAnti-Settling
Control
Control
ControlTS-720 fumed silica
TS-720 fumed silica
TS-720 fumed silica 0
1000
10 RPM
Viscosity (CPS)
Shear rate
20 RPM 50 RPM 100 RPM
2000
3000
4000
5000
6000
TS-610
TS-530
M-5
TS-720
Fumed Silica Products:
Control (no silica)
2.3% loadin
g
Pencil Hardness
5H
6H
Control
TS-720
fumed
silica
The product performance results above were obtained using the model formulation that follows. Only the fumed silica was changed.
6B 2B H
4B HB 3H 5H5B B 2H3B F4H 6H
Softer HarderPencil Hardness Scale

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