Granular mixed oxide material and thermal insulating composition on its basis

Patent metadata

Field	Value
Publication number	US-11958981-B2
Application number	US-201917260345-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Jul 17, 2018
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Hydrophobized granular material comprising from 30 to 95% by weight of a pyrogenic mixed oxide based on silica and at least one oxide of metal M selected from of Al, Ti and Fe with the content of metal M oxide in the mixed oxide being from 01 to 10% by weight, and from 5 to 70% by weight of at least one IR-opacifier selected from the group consisting of silicon carbide, zirconium dioxide, ilmenites, iron titanates, zirconium silicates, manganese oxides, graphites, carbon blacks and mixtures thereof.

First claim

The invention claimed is:

1. A hydrophobized granular material comprising from 30 to 95% by weight of a mixed oxide based on silica and at least one oxide of metal M selected from the group consisting of: Al; Ti; and Fe; wherein the mixed oxide comprises from 0.1 to 10% by weight of the metal M oxide, and from 5 to 70% by weight of at least one IR-opacifier selected from the group consisting of: silicon carbide; zirconium dioxide; ilmenites; iron titanates; zirconium silicates; manganese oxides; graphites; carbon blacks; and mixtures thereof.

2. The hydrophobized granular material of claim 1 , wherein the mixed oxide is a pyrogenic silica-alumina mixed oxide.

3. The hydrophobized granular material of claim 1 , wherein the granular material has a methanol wettability of 10% to 80% methanol by volume in a methanol/water mixture.

4. The hydrophobized granular material of claim 1 , wherein the granular material has a numerical median particle size d 50 of greater than 10 μm.

5. The hydrophobized granular material of claim 1 , wherein the granular material is essentially free of particles smaller than 200 μm.

6. The hydrophobized granular material of claim 1 , wherein the hydrophobized granular material has a BET surface area of 50 to 400 m 2 /g.

7. The hydrophobized granular material of claim 1 , wherein the granular material has a tamped density of 50 to 300 g/L.

8. The hydrophobized granular material of claim 1 , wherein the granular material has a hydroxyl group density of no greater than 0.3 mmol OH/g.

9. The hydrophobized granular material of claim 2 , wherein the granular material has a methanol wettability of 10% to 80% methanol by volume in a methanol/water mixture.

10. The hydrophobized granular material of claim 9 , wherein the granular material has a numerical median particle size d 50 of greater than 10 μm.

11. The hydrophobized granular material of claim 4 , wherein the granular material is essentially free of particles smaller than 200 μm.

12. The hydrophobized granular material of claim 11 , wherein the hydrophobized granular material has a BET surface area of 50 to 400 m 2 /g.

13. The hydrophobized granular material of claim 11 , wherein the granular material has a tamped density of 50 to 300 g/L.

14. The hydrophobized granular material of claim 13 , wherein the granular material has a hydroxyl group density of no greater than 0.3 mmol OH/g.

15. A process for producing a hydrophobized granular material of claim 1 , comprising the following steps:
a) mixing a hydrophilic silica based mixed oxide with at least one IR opacifier;
b) densifying the mixture obtained in step a) to give a hydrophilic granular material;
c) either subjecting the hydrophilic granular material produced in step b) to thermal treatment at a temperature of 200 to 1200° C. or treating the hydrophilic granular material produced in step b) with ammonia;
d) hydrophobizing the hydrophilic granular material subjected to thermal treatment in step c) with a hydrophobizing agent.

16. The process of claim 15 , wherein, in step c), the hydrophilic granular material produced in step b) is subjected to thermal treatment at a temperature of 200 to 1200° C.

17. The process of claim 15 , wherein, in step c), the hydrophilic granular material produced in step b) is treated with ammonia.

18. A thermal insulating composition comprising the hydrophobized granular material of claim 1 .

19. The thermal insulating composition of claim 18 , comprising at least one organic binder selected from the group consisting of: (meth)acrylates; alkyd resins; epoxy resins; gum Arabic; casein; vegetable oils; polyurethanes; silicone resins; wax; cellulose glue; and mixtures thereof.

20. The thermal insulating composition of claim 18 , comprising at least one inorganic binder selected from the group consisting of: calcium lime; Dolomitic lime; gypsum; anhydrite; hydraulic limes; cements; masonry cements; and mixtures thereof.

Assignees

• Evonik Operations Gmbh

Inventors

• Numrich Uwe
• Moers Christian
• Gerharz-Kalte Bettina
• Lazar Björn
• Geisler Matthias

Classifications

• C09C1/309 Primary

  Combinations of treatments provided for in groups C09C1/3009 - C09C1/3081 · CPC title

• B01J2/30

  using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic · CPC title

• C04B26/06

  Acrylates · CPC title

• C04B26/32

  containing silicon · CPC title

• C04B40/0263

  Hardening promoted by a rise in temperature (C04B40/024 takes precedence) · CPC title