Method for producing a molded heat-insulating element
AssigneeEvonik Degussa GmbH
InventorsMatthias Geisler, Frank Menzel
Life of this patent
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Abstract
A process for producing an ammonia-treated hydrophilic thermal insulation molding which includes treating a thermal insulation molding containing hydrophilic silica with ammonia by introducing the thermal insulation molding into a chamber and supplying gaseous ammonia until a pressure difference Δp of ≥20 mbar is achieved. A process for producing a thermal insulation molding containing hydrophobic silica which includes treating the ammonia-treated hydrophilic thermal insulation molding with an organosilicon compound.
Claims14
A process for producing an ammonia-treated hydrophilic thermal insulation molding, comprising treating a thermal insulation molding comprising hydrophilic silica with ammonia, such that the thermal insulation molding is introduced into a chamber and gaseous ammonia is supplied until a pressure difference Δp of ≥20 mbar is achieved.
A process for producing a thermal insulation molding comprising hydrophobic silica, the process comprising:
- a) treating a thermal insulation molding comprising hydrophilic fumed silica with ammonia by introducing the molding into a chamber and supplying gaseous ammonia until a pressure difference Δp of ≥20 mbar is achieved,
- b) subsequently treating the thus treated thermal insulation molding with (CH3)3Si—NH—Si(CH3)3 thus forming ammonia, and
- c) supplying the thus obtained ammonia, optionally with further ammonia, to another chamber in which a thermal insulation molding comprising hydrophilic fumed silica is disposed, wherein ammonia is supplied until a pressure difference Δp of ≥20 mbar is achieved.
Dependencies are inferred from the claim text.