Silicone compounds have progressed through several decades of advancement in polymer science – but a fundamental problem remains:
How to achieve optimal silicone compounds with improved rheology, flow behavior and desired mechanical properties – an expanded design space.
Fumed silica is commonly incorporated in silicone compounds to lend reinforcement. But, the polar interaction among fumed silica nano-particles – through hydrogen bonding and van der Waals forces – causes fumed silica to aggregate into a flocculated network, a phenomenon referred to as structuring.
This fundamental issue of agglomeration and structuring prevents mass production and wider adoption of advanced nano-filled silicone compounds and products.
The NanoQuan Solution
NanoQuan’s breakthrough mixing and dispersion technology solves the problems of unwanted agglomeration and structuring. So, it solves the problems of poor filler loading control and non-uniform dispersion and distribution of fumed silica in silicone compounds.
New Silicone Compounds Can Have...
• Uniform fumed silica dispersion and distribution
• Reduced viscosity
• Unsurpassed loading levels of fumed silica in silicone formulations
• No polymer damage
NanoQuan Technology Works Effectively With...
|• Room temperature vulcanizing (RTV) silicones
• Liquid silicone rubbers (LSRs)
|• Silicone fluids and greases
A fumed silica-in-silicone compound prepared with NanoQuan processing was compared with the identical compound prepared with high-shear mixing. The improvements in dispersion, loading and viscosity were dramatic in the NanoQuan compound.
Key results: NanoQuan Sample showed a 10X reduction in viscosity (Right) – a liquid-like state similar to unfilled silicone (Middle). The High-Shear-Mixed Sample showed a gum-like state (Left).
TEM Images Of Cured Silica-Silicone Compounds At 40,000 X
Left: High-Shear Sample – shows a large, aggregated fumed silica chain-like network
Right: NanoQuan Sample – shows much smaller, isolated aggregates
Silica type: fumed silica (Aerosil 300 VS)
Filler surface chemistry: untreated (hydrophilic)
Host matrix material: silicone elastomer (RTV 615) (viscosity ~ 3,000 cP)
Silica loading level/concentration: 10 wt. %