TS 720 Application Guide Cab O Sil Fumed Silica In Epoxy Coatings
User Manual: TS-720
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FUMED METAL OXIDES APPLICATION GUIDE CAB-O-SIL FUMED SILICA IN EPOXY 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. Epoxy Coatings that Can Use CAB-O-SIL Fumed Silica Include: LIGHT INDUSTRIAL COATINGS MARINE PRIMERS HEAVY MAINTENANCE COATINGS CABOT PRODUCT OFFERING Material Category Hydrophobic Fumed Silica Hydrophilic Fumed Silica CAB-O-SIL Fumed Silica Products Typical Surface Area m2/gram TS-720 120 TS-710 100 TS-610 Treatment Agent Product Characteristics 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. 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. 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. 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. PRODUCT PERFORMANCE Fumed Silica Anti-sag/ Anti-settling Effect Higher TS-720 TS-710 M-5 TS-530 TS-610 Environmental Resistance Improvements Higher 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 APPLICATION GUIDE PRODUCT PERFORMANCE 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. Sag Resistance Anti-Settling Shear Thinning Effect 6000 Fumed Silica Products: Viscosity (CPS) 5000 TS-720 fumed silica Control TS-720 fumed silica Control 4000 3000 2000 1000 0 10 RPM CAB-O-SIL TS-720 fumed silica allows the liquid coating to retain its vertical edge TS-720 M-5 2.3% loading TS-530 TS-610 Control (no silica) CAB-O-SIL TS-720 fumed silica retards pigments from settling when at rest 20 RPM 50 RPM 100 RPM Shear rate The product performance results above were obtained using the model formulation that follows. Only the fumed silica was changed. 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. Pencil Hardness 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. 6B 5B 4B 3B 2B B Softer HB F H 2H Pencil Hardness Scale MODEL FORMULATION 3H 4H 5H 6H 6H 5H Control TS-720 fumed silica Control TS-720 fumed silica The epoxy formulation below represents a typical simple black pigmented epoxy industrial coating. Formulation Processing Part A Product Name Description 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 Co-solvent 8.34 Dipropylene Glycol Normal Butyl Ether Amount (%) 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 Part A Reduced Blistering Harder Formulation REGAL® R400R 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. Curing agent Dispersion Total % 39.15 60.85 100.00 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) 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. cabotcorp.com R02 01/14 ©2013-2014 Cabot Corporation Technical Support North America: 1 800 462 2313 South America: +55 11 2144 6400 Europe: +31 71 888 4132 Asia Pacific: +86 21 5175 8800 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.
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