Method for manufacturing aerogel blanket

Patent metadata

Field	Value
Publication number	US-12384685-B2
Application number	US-202117920097-A
Country	US
Kind code	B2
Filing date	Oct 29, 2021
Priority date	Nov 9, 2020
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

The present disclosure relates to a method for manufacturing an aerogel blanket. The method includes preparing a wet gel blanket including an organic solvent, introducing the wet gel blanket into a supercritical extraction device, and drying the wet gel blanket using supercritical carbon dioxide, decompressing the pressure of the supercritical extraction device, and supplying gaseous carbon dioxide to the decompressed supercritical extraction device to dry the wet gel blanket.

First claim

The invention claimed is:

1. A method for manufacturing an aerogel blanket, the method comprising:
preparing a wet gel blanket including an organic solvent;
introducing the wet gel blanket into a supercritical extraction device, and drying the wet gel blanket using supercritical carbon dioxide;
decompressing the supercritical extraction device; and
supplying gaseous carbon dioxide to the decompressed supercritical extraction device to dry the wet gel blanket,
wherein in the supplying of the gaseous carbon dioxide, a temperature at which the gaseous carbon dioxide is supplied is 60° C. or higher.

2. The method of claim 1 , wherein the organic solvent is an alcohol.

3. The method of claim 1 , wherein in the preparing of the wet gel blanket, the wet gel blanket is a silica wet gel blanket.

4. The method of claim 1 , wherein the preparing of the wet gel blanket comprises:
preparing a precursor composition including a silica precursor and the organic solvent;
preparing a catalyst composition including the organic solvent, a catalyst, and a surface modifier;
introducing the precursor composition and the catalyst composition into an impregnation tank, and allowing a base material for a blanket to pass through the impregnation tank to prepare the wet gel blanket; and
adding a surface modification solution including a surface modifier to the wet gel blanket and aging the mixture.

5. The method of claim 4 , wherein in the allowing the base material for the blanket to pass through the impregnation tank, the wet gel blanket is a wet gel blanket in which the precursor composition and the catalyst composition are impregnated and gelled in the base material for the blanket when the base material for the blanket passes through the impregnation tank.

6. The method of claim 1 , wherein the drying of the wet gel blanket using the supercritical carbon dioxide includes drying the wet gel blanket, and at the same time, extracting the organic solvent.

7. The method of claim 6 , wherein the extracted organic solvent is recirculated to the preparing of the wet gel blanket.

8. The method of claim 1 , wherein the decompressing of the supercritical extraction device is performed such that a pressure of the supercritical extraction device is to be between 10 bar to 70 bar following the decompressing of the supercritical extraction device.

9. The method of claim 1 , wherein the decompressing of the supercritical extraction device comprises performing a first decompression such that a pressure of the supercritical extraction device is to be 50 bar to 70 bar following a first decompressing of the supercritical extraction device; and performing a second decompression such that the pressure of the supercritical extraction device is to be between 10 bar to 50 bar following a second decompressing of the supercritical extraction device.

10. The method of claim 1 , wherein in the supplying of the gaseous carbon dioxide, a pressure at which the gaseous carbon dioxide is supplied is 10 bar to 70 bar.

11. The method of claim 1 , wherein the supplying of the gaseous carbon dioxide includes drying the wet gel blanket, and at the same time, extracting the organic solvent.

12. The method of claim 11 , wherein the extracted organic solvent is recirculated to the preparing of the wet gel blanket.

13. The method of claim 1 , further comprising decompressing the supercritical extraction device to atmospheric pressure after the supplying of the gaseous carbon dioxide.

14. The method of claim 1 , wherein a recovery rate of the organic solvent extracted in the method for manufacturing an aerogel blanket is 98.00 wt % or greater.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sang Woo
• Baek Se Won

Classifications

• B01D11/0203

  with a supercritical fluid · CPC title

• B01J3/008

  Processes carried out under supercritical conditions · CPC title

• C01B33/159

  Coating or hydrophobisation · CPC title

• B01J13/0091 Primary

  Preparation of aerogels, e.g. xerogels · CPC title

• C01B33/1585 Primary

  Dehydration into aerogels · CPC title