Heat insulating material, method for manufacturing same, and electronic equipment and automobile using same

Patent metadata

Field	Value
Publication number	US-11577490-B2
Application number	US-201916586858-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Oct 5, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A heat insulating material includes an aerogel that has macro-pores and meso-pores. A method for manufacturing a heat insulating material, including: a sol preparation step of adding a gelling agent into sodium silicate such that a molar ratio of the gelling agent relative to NaO2 is 0.1 to 0.75, and adjusting a sol into which macro-pores are introduced by leaving unreacted Na and non-cross-linked oxygen in a siloxane skeleton; an impregnating and gelling step of impregnating a nonwoven fabric fiber structure with the sol to form a composite of hydrogel-nonwoven fabric fiber; a hydrophobizating step of mixing the formed composite of hydrogel-nonwoven fabric fiber with a silylating agent to modify a surface thereof; and a drying step of removing a liquid contained in the surface modified composite of hydrogel-nonwoven fabric fiber by drying under a temperature and pressure lower than respective critical values.

First claim

What is claimed is:

1. A heat insulating material comprising:
an aerogel that has macro-pores and meso-pores, wherein:
a fine pore distribution of the macro-pores is 1 to 10 μm and of the meso-pores is 2 to 50 nm,
the aerogel further includes pores having a fine pore distribution other than the macro-pores being 1 to 10 μm and the meso-pores being 2 to 50 nm, and
a peak of a fine pore distribution of a total pore volume is located between 50 nm and 10 μm.

2. The heat insulating material according to claim 1 , comprising:
the aerogel, wherein
an average fine pore diameter of the meso-pores is 20 to 40 nm, and
an average fine pore diameter of the macro-pores is 2 to 6 μm.

3. The heat insulating material according to claim 1 , wherein
the aerogel has 7 to 60 vol % of the macro-pores relative to a total fine pore volume, and 15 to 60 vol % of the meso-pores relative to the total fine pore volume.

4. The heat insulating material according to claim 1 , wherein
the aerogel is retained in a nonwoven fabric fiber.

5. The heat insulating material according to claim 1 , wherein
a thermal conductivity after compression is decreased by 5% or more relative to an initial thermal conductivity.

6. The heat insulating material according to claim 5 , wherein
a thermal conductivity after compression under 5 MPa is decreased by 5% or more relative to the initial thermal conductivity.

7. The heat insulating material according to claim 1 , wherein
the aerogel is a silica aerogel.

8. A piece of electronic equipment that uses the heat insulating material according to claim 1 between an electronic component with heat generation and a housing.

9. An automobile that uses the heat insulating material according to claim 1 between batteries.

10. A heat insulating material comprising:
an aerogel that has macro-pores and meso-pores, wherein:
a fine pore distribution of the macro-pores is 1 to 10 μm and of the meso-pores is 2 to 50 nm,
the aerogel further includes pores having a fine pore distribution other than the macro-pores being 1 to 10 μm and the meso-pores being 2 to 50 nm, and
a thermal conductivity after compression is decreased by 5% or more relative to an initial thermal conductivity.

11. The heat insulating material according to claim 10 , wherein
a thermal conductivity after compression under 5 MPa is decreased by 5% or more relative to the initial thermal conductivity.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Oikawa Kazuma
• Sakatani Shigeaki
• Nishikawa Kazuhiro
• Komyoji Daido

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• C04B2201/30

  for heat transfer properties such as thermal insulation values, e.g. R-values · CPC title

• B32B38/08

  Impregnating · CPC title

• C04B41/68

  Silicic acid; Silicates · CPC title

• D06N3/128

  with silicon polymers · CPC title