Method for producing hydrophobic silica aerogel blanket, and silica aerogel blanket

Patent metadata

Field	Value
Publication number	US-2026091981-A1
Application number	US-202318878633-A
Country	US
Kind code	A1
Filing date	Jul 21, 2023
Priority date	Jul 22, 2022
Publication date	Apr 2, 2026
Grant date	—

Abstract

The present invention relates to a method for producing a silica aerogel blanket having excellent surface modification efficiency and high hydrophobicity while not containing residual chlorine, and to a silica aerogel blanket produced thereby and not containing residual chlorine.

First claim

1 . A method for producing a silica aerogel blanket, the method comprising:
preparing a silica sol containing a water glass solution; impregnating the silica sol into a substrate for a blanket; preparing a wet gel by gelling the silica sol while the silica sol is impregnated into the substrate for a blanket; immersing the wet gel in an acid mixture aqueous solution containing acetic acid and a nitric acid aqueous solution; surface modifying the wet gel with an alkyldisiloxane-based compound to prepare a surface modified wet gel; and drying the surface-modified wet gel, wherein after the immersing the wet gel, an acetic acid concentration (w/w) is 30% to 90%, and a nitric acid concentration (w/w) is 5% to 10%.

2 . The method for producing a silica aerogel blanket of claim 1 , wherein the acetic acid concentration (w/w %) is 35% to 80%.

3 . The method for producing a silica aerogel blanket of claim 1 , wherein the nitric acid concentration (w/w %) is 5.5% to 8%.

4 . The method for producing a silica aerogel blanket of claim 1 , wherein after the immersing the wet gel in the acid mixture aqueous solution is completed, the surface modifying with the alkyldisiloxane-based compound is sequentially performed.

5 . The method for producing a silica aerogel blanket of claim 1 , wherein the acid mixture aqueous solution and the alkyldisiloxane-based compound are sequentially introduced into the wet gel, or the acid mixture aqueous solution and the alkyldisiloxane-based compound are simultaneously introduced into the wet gel.

6 . The method for producing a silica aerogel blanket of claim 1 , wherein the alkyldisiloxane-based compound is added in a volume ratio of 1 to 3 times based on a total volume of the wet gel.

7 . The method for producing a silica aerogel blanket of claim 1 , wherein the alkyldisiloxane-based compound comprises hexa(C 1-8 alkyl)disiloxane.

8 . The method for producing a silica aerogel blanket of claim 1 , wherein the method is performed under a chlorine-free condition.

9 . A silica aerogel blanket having a thermal conductivity of 12 mW/mK to 19 mW/mK, and a Cl content of 0 ppm to 500 ppm.

10 . The silica aerogel blanket of claim 9 , wherein the silica aerogel blanket has a CI content of 0 ppm to 200 ppm.

11 . The method for producing a silica aerogel blanket of claim 1 , wherein the acetic acid concentration (w/w %) is 36% to 78%.

12 . The method for producing a silica aerogel blanket of claim 1 , wherein the nitric acid concentration (w/w %) is 5.5% to 7.3%.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Kyu Reon
• Kim Mi Ri
• Oh Myung Eun
• Oh Kyoung Shil

Classifications

• C01B33/159 Primary

  Coating or hydrophobisation · CPC title

• C01B33/152

  Preparation of hydrogels · CPC title

• C01B33/146

  After-treatment of sols ({preparation of hydrosols or aqueous dispersions from hydroorganosols, organosols or dispersions in an organic medium C01B33/141}; preparation of hydroorganosols, organosols or dispersions in an organic medium from hydrosols {or aqueous dispersions} C01B33/145) · CPC title

• C01B33/1417

  an aqueous dispersion being obtained · CPC title

• C01P2006/80

  Compositional purity · CPC title