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CAB-O-SIL ® ULTRABONDFUMED SILICA FOR EPOXY ADHESIVES FUMED METAL OXIDES

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CAB-O-SIL® ULTRABOND™ FUMED SILICA FOR EPOXY ADHESIVES

FUMED METAL OXIDES

IntroductionWe have a long history of supporting adhesive and sealant manufacturers to meet new performance requirements. Fumed silica provides rheology and reinforcement to adhesive and sealant formulations. Our CAB-O-SIL® fumed silica products meet and exceed the challenging requirements of our global customers. CAB-O-SIL ULTRABOND™ fumed silica sets a new standard of performance for epoxy adhesives when it entered the market.

CAB-O-SIL ULTRABOND fumed silica is our highest performing surface treated fumed silica. Compared to other polydimethylsiloxane (PDMS) treated silicas, CAB-O-SIL ULTRABOND fumed silica improves adhesives systems by reducing the viscosity in the application without compromising sag resistance.

CAB-O-SIL ULTRABOND fumed silica is best suited for epoxy adhesives with loading levels greater than 5% and those that require high sag resistance and excellent storage stability.

Structural adhesivesCAB-O-SIL ULTRABOND fumed silica improves adhesive performance in epoxy formulations for use in a wide range of industries including automotive, aerospace, construction, electronics and flooring.

The transportation industry now requires structural adhesives that can replace traditional welding or riveting to bond two vehicle parts together. The use of structural adhesives in transportation manufacturing has steadily increased over the years, as it offers advantages over classic bonding techniques, including the ability to use lightweight design components with improved mechanical strength. These lightweight components help the transportation industry achieve more aggressive weight-reduction goals and improve vehicle fuel efficiency.

Sag resistance and storage stabilityIn epoxy resins, CAB-O-SIL ULTRABOND fumed silica provides excellent sag resistance and storage stability compared to other PDMS treated silicas. Figure 1 shows the sag resistance in epoxy resin, as assessed by a yield stress measurement, upon manufacture and after 28 days of accelerated aging at 60 °C. The epoxy resins containing CAB-O-SIL ULTRABOND fumed silica were shown to provide higher yield stress both initially and after aging than epoxies made with competitive PDMS-treated silicas.

Wind bonding paste, used to manufacture wind blades, is a critical component with strict performance requirements. As a result of collaboration between our adhesives applications development team and wind blade producers, CAB-O-SIL ULTRABOND fumed silica enables significant improvements in sag resistance and storage stability of bonding paste. This enables bonding paste to have an extended shelf life, allowing producers to ship paste to blade manufacturers around the world. CAB-O-SIL ULTRABOND fumed silica can be added to bonding paste at lower loadings, while still maintaining sag resistance and reduced viscosity.

Delivers better performance at lower loadingAs shown in Figure 2, instead of the typical fumed silica loading of 8% in epoxy based bonding paste, CAB-O-SIL ULTRABOND fumed silica loading could be reduced by 10 – 15% versus competitive products, while still maintaining the same sag resistance performance. This can effectively reduce the processing time, allowing bonding paste producers to decrease their respective manufacturing costs while increasing their manufacturing capacity.

To generate the data shown in Figure 3, equal amounts of silica were incorporated into an epoxy resin. The relative amount of time to incorporate the competitive silicas was 1.5 times that of ULTRABOND fumed silica. In formulations with high silica loadings, the faster incorporation of ULTRABOND fumed silica can translate into shorter batch times and higher throughput.

Figure 3: Total relative processing time

using fumed silica in epoxy resin

Figure 1: Sag resistance of Hexion EPON 828 epoxy resin

containing PDMS-treated fumed silicas after 28 days of

accelerated aging at 60 °C

Figure 2: Fumed silica required to achieve a yield stress in

epoxy resin

0 0

40 2.0

80 4.0

120 6.0

160 8.0

20

60

100

140

180

200 10.0

6.0

6.97.2 6.9

CAB-O-SIL ULTRABOND fumed silica

CAB-O-SIL ULTRABOND fumed silica Competitor A

CAB-O-SIL TS-720 fumed silica Competitor B

Day 1 Day 28

CAB-O-SILTS-720

fumed silica

CompetitorA

CompetitorB

CAB-O-SIL ULTRABOND fumed silica

CompetitorA

CompetitorB

Yiel

d st

ress

(Pa

)

Sili

ca lo

adin

g (w

t. %

)

Fumed silica at 6% in epoxy resinYield stress (Pa)

After 28 days at 60 °C

6.8

8.08.37.9

0

0.5

1.0

1.5

2.0

200 300

CAB-O-SIL® ULTRABOND™ FUMED SILICA FOR EPOXY ADHESIVES

The CAB-O-SIL and ULTRABOND names are trademarks of Cabot Corporation. The EPON name is a trademark of Hexion Inc. The Ancamide name is a trademark of Air Products and Chemicals, Inc. The Jeffamine name is a

trademark of Huntsman International LLC.

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.

cabotcorp.com ©2016 Cabot Corporation.

R02 09/16

NORTH AMERICA Cabot Corporation Business

and Technical Center

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0.4 sec-10.4 sec-1

Figure 4: Shear thinning behavior of epoxy resin and polyamide

curing agent at 5.4% silica loading

Figure 5: Shear thinning behavior of epoxy resin and

polyetheramine curing agent at 6.2% silica loading

8% silica by weight in Hexion EPON® 828 epoxy resin mixed with Air Products and Chemicals, Inc. Ancamide® 351A curing agent (52 parts curative to 100 parts resin)

8% silica by weight in Hexion EPON 828 epoxy resin mixed with Huntsman Performance Products Jeffamine® D-230 curing agent (32 parts curative to 100 parts resin)

Viscosity of epoxy adhesives

Shear thinning and recovery rateThe thixotropic (shear thinning) behavior imparted by PDMS-treated silica in an epoxy system is important to the adhesive formulator and user. At high shear rates equivalent to those imparted during mixing or bead application, the viscosity decreases, facilitating processing, pumping and dispensing of the adhesive. This is illustrated in Figures 4 and 5.

Following high shear mixing, viscosity recovers quickly to comparable levels exhibited by the formulation prior to high shear. During use, this can prevent an adhesive bead from slumping or sagging and fillers from settling.

CAB-O-SIL ULTRABOND fumed silica imparts higher viscosity than CAB-O-SIL TS-720 fumed silica, our other leading PDMS-treated silica, yet is equally shear thinning and provides a faster rate of viscosity recovery.

CAB-O-SIL TS-720 fumed silica CAB-O-SIL ULTRABOND fumed silica CAB-O-SIL TS-720 fumed silica CAB-O-SIL ULTRABOND fumed silica

0 0200 200400 400600 600800 8001000 10001200 12000 0

500 1000

1000 2000

1500 3000

2000 5000

2500 5000

Visc

osit

y (P

a-se

c)

Visc

osit

y (P

a-se

c)

Time (sec) Time (sec)

Shear rate = 0.4 sec-1 Shear rate = 0.4 sec-1

80 sec-1 80 sec-1

CAB-O-SIL® ULTRABOND™ FUMED SILICA FOR EPOXY ADHESIVES