Composite thermal insulation sheet including aerogel

Patent metadata

Field	Value
Publication number	US-11312103-B2
Application number	US-201816631375-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Nov 28, 2017
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Provided is a composite thermal insulation sheet including an aerogel and a method for manufacturing the same. The methods yield an ultra-thin aerogel composite sheet having characteristics of low dust, high strength and high thermal insulation, thereby having an increased applicability thereof to an electronic device.

First claim

The invention claimed is:

1. A composite thermal insulation sheet comprising:
an aerogel sheet;
a coating layer impermeable to a sol formed on one surface of the aerogel sheet; and
one or more functional layers formed on the other surface of the aerogel sheet,
wherein a thickness of the coating layer is from 30 μm or less, and
wherein a thickness of the composite thermal insulation sheet is 3 mm or less.

2. The composite thermal insulation sheet of claim 1 , wherein the coating layer comprises one or more than one polymer selected from the group consisting of Polyamide (PA), Polyethylene (PE), Polyethylene Terephthalate (PET), Polyimide (PI) and silicone.

3. The composite thermal insulation sheet of claim 1 , wherein the sol comprises one or more than one material selected from the group consisting of zirconia, yttrium oxide, hafnia, alumina, titania, ceria, silica, magnesium oxide, calcium oxide, magnesium fluoride and calcium fluoride.

4. The composite thermal insulation sheet of claim 1 , wherein the functional layer exhibits one or more functions selected from the group consisting of thermal diffusion, insulation, sound absorption, vibration resistance, impermeability to water and permeability to water vapor.

5. The composite thermal insulation sheet of claim 1 , wherein the aerogel sheet comprises an inorganic fiber, an organic fiber, or a combination thereof.

6. The composite thermal insulation sheet of claim 1 , wherein the thickness of the sol-impermeable coating layer is 10 μm to 30 μm.

7. The composite thermal insulation sheet of claim 1 , wherein the thickness of the aerogel sheet is 2 mm or less.

8. A method for manufacturing a composite thermal insulation sheet, the method comprising:
forming a sol-impermeable coating layer on one surface of a fiber sheet;
impregnating the other surface of the fiber sheet with a sol and a catalyst to form an impregnated sheet;
forming a wet gel sheet by gelling the impregnated sheet;
forming an aerogel sheet by drying the wet gel sheet; and
forming one or more functional layers on the aerogel sheet,
wherein the sol comprises one or more than one material selected from the group consisting of zirconia, yttrium oxide, hafnia, alumina, titania, ceria, silica, magnesium oxide, calcium oxide, magnesium fluoride and calcium fluoride,
wherein a thickness of the coating layer is from 30 μm or less, and
wherein a thickness of the composite thermal insulation sheet is 3 mm or less.

9. The method of claim 8 , wherein the one or more functional layers are formed on the other surface on which the sol-impermeable coating layer of the composite thermal insulation sheet is not formed.

10. The method of claim 8 , wherein the sol-impermeable coating layer is formed on one surface of the fiber sheet by placing a fiber on a coating material of a release paper comprising the coating material and then performing a heat treatment.

11. The method of claim 10 further comprising removing the release paper from the coating layer after the completion of gelation.

Assignees

• Lg Chemical Ltd
• Lg Electronics Inc

Inventors

• Oh Kyoung Shil
• Lee Je Kyun
• Han Byoung Wook
• Jeon Yong Seog
• Park Sang Woo
• Kim Joong Nyon

Classifications

• B32B2266/126

  Aerogel, i.e. a supercritically dried gel · CPC title

• B32B9/046

  of foam · CPC title

• D06N3/0095

  by inversion technique; by transfer processes · CPC title

• B32B2262/0261

  Polyamide fibres · CPC title

• B32B9/007

  comprising carbon, e.g. graphite, composite carbon · CPC title