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US 9,233,986 B2Granted
Method for producing hydrophobic, heat-insulating mouldings
AssigneeEvonik Degussa GmbH
InventorsGuenter Kratel, Gerd Borchert, Frank Menzel
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Abstract
Process for hydrophobizing a microporous thermal insulation molding comprising hydrophilic silica, in which the molding is treated with at least one organosilane and in which one or more organosilanes which are gaseous under the reaction conditions are introduced into a chamber containing the microporous thermal insulation molding comprising hydrophilic silica until the pressure difference Δp is ≧20 mbar.
Claims17
A process for hydrophobizing a molding, the method comprising:
- perforating a microporous thermal insulation molding comprising hydrophilic silica, to obtain a perforated, microporous molding;
- and
- treating the perforated, microporous molding with at least one organosilane in a chamber, thereby obtaining a hydrophobized molding,
- wherein:
- the at least one organosilane is gaseous under said treating and is introduced into the chamber until a pressure difference Δp is ≧20 mbar, wherein Δp=p2−p1, where p1=pressure in the chamber before introduction of the organosilane, p2=pressure in the chamber at which the introduction of the organosilane is stopped.
2 more elements
Dependencies are inferred from the claim text.