Method for producing silica aerogel and silica aerogel produced thereby

Patent metadata

Field	Value
Publication number	US-11242255-B2
Application number	US-202016794771-A
Country	US
Kind code	B2
Filing date	Feb 19, 2020
Priority date	Sep 12, 2016
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

Disclosed herein is a method of preparing a silica aerogel. The silica aerogel is prepared by adding a first water glass solution and an acid catalyst to a reactor to form a first silica wet gel. The method further includes adding a second water glass solution and an acid catalyst to the first silica wet gel. The method further includes adding a surface modifier solution to the first silica wet gel to form a second silica wet gel. The method further includes drying a silica wet gel including the first silica wet gel and the second silica wet gel. The prepared silica aerogel has a tap density of 0.032 to 0.070 g/mL and a carbon content of 11.2 to 12.1 wt %.

First claim

The invention claimed is:

1. A method of preparing a silica aerogel prepared by:
1) adding a first water glass solution and an acid catalyst to a reactor to form a first silica wet gel;
2) adding a second water glass solution and an acid catalyst to the first silica wet gel;
3) adding a surface modifier solution to the first silica wet gel to form a second silica wet gel; and
4) drying a silica wet gel including the first silica wet gel and the second silica wet gel, wherein the silica aerogel has a tap density of 0.032 to 0.070 g/mL and wherein the silica aerogel has a carbon content of 11.2 to 12.1 wt %.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Young Hun
• Lee Je Kyun

Classifications

• C01B33/145 Primary

  Preparation of hydroorganosols, organosols or dispersions in an organic medium · CPC title

• C01B33/1546

  the first formed hydrosol being converted to a hydrogel by introduction into an organic medium immiscible or only partly miscible with water · CPC title

• B01J13/0091

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

• C01B33/1585 Primary

  Dehydration into aerogels · CPC title

• B01J13/0056

  containing inorganic material and water · CPC title