Fumed Silica
Zhongtian East Fluorine Silicon Material Co., Ltd.,a silicone product supplier, mainly engaged in organic silicon monomer, research and development of fluorine silicon new materials and silicone sealant. If you want to buy fumed silica, you can choose us.
Technical Data of fumed silica for sale
|
Item |
Indexes |
|
The nitrogen adsorption specific surface area/（m2/g） |
Typical values±30 |
|
Loss on ignition/% ≤ |
|
|
Silica content/% ≥ |
|
|
Suspension PH |
|
|
Al2O3 content/（mg/kg） ≤ |
400 |
|
TiO2 content/（mg/kg） ≤ |
200 |
|
Ti2O3 content/（mg/kg） ≤ |
30 |
|
Carbon content/% ≤ |
|
|
Chloride content（mg/kg） ≤ |
250 |
|
105℃ volatiles/% ≤ |
3 |
|
Tap density /（g/dm3） |
30~60 |
|
45μm screenings/（mg/kg） ≤ |
250 |
Applications of fumed silica powder
Due to its small particle size, the specific surface area is big, therefore the surface adsorption power, surface energy, high chemical purity
Package Storage and Transportation
This product's hygroscopicity is strong, with more than three layers of kraft paper valve bag packaging, using vacuum packaging machines, automatic packaging.
Description of Fumed Silica
Fumed silica, molecular formula is SiO2. White fluffy powder, porous, non-toxic, tasteless and pollution-free, high temperature resistant. At the same time it has the chemical inertness and special thixotropy can significantly improve the tensile strength, tear resistance and wear resistance of rubber products, rubber improved strength increased by tens of times. It can be used as rheological and thixotropic control for liquid systems, adhesives, polymers, etc., as an anti-sink, thickening, anti-sagging additive, reinforcement for HCR and RTV-2K silicone rubber, used to regulate free flow and as an anti-caking agent to improve powder properties, etc.
The Role of Fumed Silica in Coatings
Rheology additives
Rheology is an important property of coatings, which directly affects the appearance, construction performance and storage stability of coatings, and the requirements of rheology additives vary from coating system to coating system. For oil-based systems, most of the rheology additives work by forming hydrogen bonds. The untreated fumed silica aggregates on the surface contain multiple, one of which is isolated and undisturbed free, and the other is continuous, forming hydrogen bonds with each other. When the shear force is removed, the three-dimensional structure will recover itself and the viscosity will rise. In completely non-polar liquids, the viscosity recovery time is only a fraction of a second; in polar liquids, the recovery time is longer, depending on the concentration of fumed silica and its degree of dispersion, this characteristic gives oil-based coatings very good storage and construction performance, especially thick paste-shaped coatings, both to ensure that the coating in a certain construction shear has good fluidity, but also to ensure that the coating film of a construction thickness, usually, In the construction process, because the solvent at the edge of the coating evaporates faster, resulting in uneven surface tension, easy to make the coating move to the edge, and the silica network can effectively prevent the movement of the coating and form a thick edge, but also to prevent the coating in the curing process of the hanging phenomenon, so that the coating uniform. At the same time, fumed silica can form hydrogen bonds and increase the low and medium shear viscosity in the system, thus playing a thickening role. Therefore, fumed silica is very widely used in oil-based systems.
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