Silica molded bodies having low thermal conductivity

Patent metadata

Field	Value
Publication number	US-2019016634-A1
Application number	US-201615754394-A
Country	US
Kind code	A1
Filing date	Aug 9, 2016
Priority date	Aug 28, 2015
Publication date	Jan 17, 2019
Grant date	—

Abstract

Hydrophobic shaped silica bodies having low density and low thermal conductivity are produced by forming a dispersion of silica in a solution of binder and organic solvent, and removing the solvent and shaping to form a shaped body. The shaped bodies retain their hydrophobicity, are stable with regards to shape, and are useful in acoustic and thermal insulation.

First claim

1 .- 7 . (canceled)

8 . A process for producing shaped silica bodies having a C content of less than 8% by weight,
a density, determined by Hg porosimetry, of less than 0.30 g/cm 3 , a pore volume for pores smaller than 4 μm, determined by Hg porosimetry, of more than 2.0 cm 3 /g, a proportion of the pores smaller than 4 μm, based on the total pore volume, of at least 60% and a thermal conductivity, determined by a non-steady-state method, of less than 30 mW/K*m, comprising:
i) producing a dispersion containing silica, at least one binder and an organic solvent, and
ii) evaporating the solvent from the dispersion, and shaping to form the shaped silica bodies.

9 . The process of claim 8 , wherein hydrophilic silica or a mixture of hydrophilic silica and partially hydrophobic silica is as the silica.

10 . The process of claim 8 , wherein silanes containing a C 1 -C 3 -alkyl group, C 2-3 alkenyl group, methoxy group, ethoxy group, or a mixture thereof are used as a binder.

11 . The process of claim 8 , wherein at least one solvent is selected from the group consisting of alkanes, ethers, alcohols, and mixtures thereof.

12 . A shaped silica body produced by the process of claim 8 .

13 . Acoustic or thermal insulation comprising shaped silica bodies of claim 12 .

Assignees

• Wacker Chemie Ag

Inventors

• Jantke Dominik
• Weidner Richard
• Hindelang Konrad

Classifications

• C04B2111/52

  Sound-insulating materials · CPC title

• C04B26/32 Primary

  containing silicon · CPC title

• G10K11/162

  Selection of materials · CPC title

• C04B38/009 Primary

  Porous or hollow ceramic granular materials, e.g. microballoons (C04B18/027, C04B20/002 take precedence) · CPC title

• C04B38/00

  Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536}) · CPC title