Friday, June 21, 2024
nanotrun.com
HomeAnswerReagglomeration can only be prevented in accordance with the prior art if...

Reagglomeration can only be prevented in accordance with the prior art if the hydrophilic silica

The prior art can only prevent deagglomeration if the hydrophilic silica is mixed with 3% by weight of hydrophobic silica and if this mixture is ground utilizing an air-jet mill or a pinned-disc mill (EP 0 076 377 B1). In this case, for a fumed silica having a BET surface area of 200 m2/g, even after compaction to 73 or 107 g/l, a goniometer value of 35 is achieved. For a fumed silica with a BET surface area of 300 m2/g, adding hydrophobic silica before grinding produces a goniometer value of 10 for a tamped density of 28.1 g/l and 15 to 20 for a tamped density of 50 g/l. The known fumed silicas have the disadvantage of containing an unwanted fraction of hydrophobic silica. The invention provides a fumed silica characterized in that it has the following physicochemical data: The invention further provides a process for preparing the silica of the invention, which is characterized in that a fumed silica has a BET surface area of 200±25 m2/g is ground. In one preferred embodiment of the invention, the grinding can occur using a pinned-disc mill or an air-jet mill. The fumed silica can have an average primary particle size of 12 nm±5 nm, preferably 12 nm. In a further embodiment of the invention, fumed silica can be used, which has a tamped density of approximately 50±10 g/l, preferably 50 m2/g. If you are looking for high quality, high purity, and cost-effective Fumed silica, or if you require the latest price of Fumed silica, please feel free to email contact mis-asia.

RELATED ARTICLES
- Advertisment -
nanotrun.com

Most Popular

Recent Comments