Granular thermal insulation material and method for producing the same

Patent metadata

Field	Value
Publication number	US-11565974-B2
Application number	US-201816478169-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Jan 18, 2017
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

The present invention relates to a granular thermal insulation material comprising hydrophobized silicon dioxide and at least one IR opacifier, having a tamped density of up to 250 g/l and a compressive strength according to DIN EN 826:2013 at 50% compression of 150 to 300 kPa or greater than 300 kPa, to processes for production thereof and to the use thereof for thermal insulation.

First claim

The invention claimed is:

1. A granular material comprising hydrophobized silicon dioxide and at least one IR opacifier, wherein said granular material comprises:
a) a tamped density of up to 250 g/l; and
b) a compressive strength according to DIN EN 826:2013 at 50% compression of greater than 300 kPa, wherein the compressive strength is measured on a bed with a square face having an edge length of 200 mm and bed height 20 mm.

2. The granular material of claim 1 , wherein the IR opacifier is selected from the group consisting of: silicon carbide; titanium dioxide; zirconium dioxide; ilmenites; iron titanates; iron oxides; zirconium silicates; manganese oxides; graphites; carbon blacks; and mixtures thereof.

3. The granular material of claim 1 , wherein said granular material comprises a BET surface area of 50 to 400 m 2 /g.

4. The granular material of claim 1 , wherein said granular material comprises a tamped density of 100 to 240 g/l.

5. The granular material of claim 1 , wherein said granular material comprises a compressive strength according to DIN EN 826:2013 at 50% compression of greater than 300 kPa to 2000 kPa, wherein the compressive strength is measured on a bed with a square face having an edge length of 200 mm and bed height 20 mm.

6. The granular material of claim 1 , wherein said granular material comprises a thermal conductivity of less than 50 mW/(m*K) according to EN 12667:2001, measured in the bed, at a mean measurement temperature of 10° C., a contact pressure of 250 Pa under an air atmosphere and at standard pressure.

7. The granular material of claim 1 , wherein the silicon dioxide has been produced by pyrogenic means.

8. The granular material of claim 1 , wherein said granular material comprises a methanol wettability of methanol content 10% to 60% by weight in a methanol/water mixture.

9. The granular material of claim 2 , wherein said granular material comprises a BET surface area of 50 to 400 m 2 /g.

10. The granular material of claim 2 , wherein said granular material comprises a tamped density of 100 to 240 g/l.

11. The granular material of claim 2 , wherein said granular material comprises a compressive strength according to DIN EN 826:2013 at 50% compression of greater than 300 kPa to 2000 kPa, wherein the compressive strength is measured on a bed with a square face having an edge length of 200 mm and bed height 20 mm.

12. The granular material of claim 2 , wherein said granular material comprises a thermal conductivity of less than 50 mW/(m*K) according to EN 12667:2001, measured in the bed, at a mean measurement temperature of 10° C., a contact pressure of 250 Pa under an air atmosphere and at standard pressure.

13. The granular material of claim 12 , wherein said granular material comprises a compressive strength according to DIN EN 826:2013 at 50% compression of greater than 300 kPa to 2000 kPa, wherein the compressive strength is measured on a bed with a square face having an edge length of 200 mm and bed height 20 mm.

14. The granular material of claim 13 , wherein said granular material comprises a tamped density of 100 to 240 g/l.

15. The granular material of claim 2 , wherein said granular material comprises a methanol wettability of methanol content 10% to 60% by weight in a methanol/water mixture.

16. A process for producing the granular material of claim 1 , comprising the following steps:
a) mixing a hydrophilic silicon dioxide with at least one IR opacifier;
b) densifying the mixture obtained in step a) to give a granular material;
c) either:
i) subjecting the granular material produced in step b) to thermal treatment at a temperature of 200 to 1200° C.; or
ii) treating the granular material produced in step b) with ammonia;

d) hydrophobizing the granular material produced in step c) with a hydrophobizing agent.

17. The process of claim 16 , wherein step c)i) is conducted at 800-1100° C.

18. The process of claim 16 wherein, step b) and/or c) and/or d) is followed by a separation of fractions of the granular material of different size from one another.

19. The process of claim 16 , wherein the hydrophobizing agent used in step d) is selected from the group consisting of halosilanes, alkoxysilanes, silazanes and siloxanes.

20. The process of claim 16 , wherein the granular material comprises a thermal conductivity of less than 50 mW/(m*K) according to EN 12667:2001, measured in the bed, at a mean measurement temperature of 10° C., a contact pressure of 250 Pa under an air atmosphere and at standard pressure.

Assignees

• Evonik Operations Gmbh

Inventors

• Geisler Matthias
• Herr Ann-Kathrin
• Moers Christian
• Gärtner Gabriele

Classifications

• C04B30/00

  Compositions for artificial stone, not containing binders · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C04B40/0071

  making use of a rise in pressure · CPC title

• C04B2103/56

  Opacifiers · CPC title

• C04B35/14 Primary

  based on silica · CPC title