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US 2019/0375942 A1Published application
Method for producing hydrophobic silica granules
AssigneeWacker Chemie AG
InventorsKonrad HINDELANG, Dominik JANTKE, Richard WEIDNER
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Abstract
Granular and/or shaped hydrophobic silica useful for thermal insulation materials are prepared by mixing hydrophilic silica with a hydrophobicizing agent at low temperature so the hydrophobicizing agent does not appreciably react, followed by deaeration and compaction.
Claims9
-8. (canceled)
A process for producing hydrophobic silica granular materials, comprising:
- i) coating a mixture comprising hydrophilic silica with at least one hydrophobicizing agent at a temperature of not more than 55° C.,
- ii) after a storage time of not more than 24 hours, deaerating the mixture from step i),
- iii) compacting the mixture from step ii) to a target bulk density, and
- iv) granulating during the compaction in step iii).
1 more element
Dependencies are inferred from the claim text.