Thermal insulation sheet and method for producing the same, and electronic device and battery unit
Used is a method for producing a thermal insulation sheet, including: composite-forming including impregnating a nonwoven fabric with a basic sol prepared by adding a carbonate ester to a water glass composition to form a hydrogel-nonwoven fabric composite; surface-modifying including mixing the composite with a silylating agent for surface modification; and drying including removing liquid contained in the composite through drying at a temperature lower than the critical temperature of the liquid under a pressure lower than the critical pressure of the liquid. Used is a thermal insulation sheet including an aerogel and a nonwoven fabric, where the thermal insulation sheet exhibits a compressibility of 40% or lower at 0.30 to 5.0 MPa.
1. A thermal insulation sheet comprising:
an aerogel; and
fibers made of at least one material selected from the group consisting of an inorganic material, a resin material, and a natural material,
wherein a compressibility of the thermal insulation sheet at 5.0 MPa is 40% or lower.
2. The thermal insulation sheet according to claim 1 , wherein a thermal resistance of the thermal insulation sheet in compressing at 5.0 MPa is 0.01 m 2 K/W or higher.
3. The thermal insulation sheet according to claim 1 , wherein:
a specific surface area of the aerogel is 300 m 2 /g or larger and 600 m 2 /g or smaller, and
a pore volume of the aerogel is smaller than 1.5 ml/g.
4. The thermal insulation sheet according to claim 1 , wherein a bulk density of the thermal insulation sheet is 0.3 g/cm 3 or higher and 0.5 g/cm 3 or lower.
5. The thermal insulation sheet according to claim 1 , wherein a weight proportion of the aerogel in the thermal insulation sheet is 50 wt % or higher.
6. The thermal insulation sheet according to claim 1 , wherein a weight proportion of the aerogel in the thermal insulation sheet is 50 wt % or higher and 80 wt % or lower.
7. An electronic device comprising:
the thermal insulation sheet according to claim 1 ;
an electronic part having a heat generating property; and
a housing,
wherein the thermal insulation sheet is disposed between the electronic part and the housing.
8. A battery unit comprising:
the thermal insulation sheet according to claim 1 ; and
a plurality of batteries,
wherein the thermal insulation sheet is disposed between two adjacent batteries among the plurality of batteries.
9. A thermal insulation sheet comprising:
a porous body including silica; and
fibers made of at least one material selected from the group consisting of an inorganic material, a resin material, and a natural material,
wherein a compressibility of the thermal insulation sheet at 5.0 MPa is 40% or lower.
10. The thermal insulation sheet according to claim 9 , wherein a thermal resistance of the thermal insulation sheet in compressing at 5.0 MPa is 0.01 m 2 K/W or higher.
11. The thermal insulation sheet according to claim 9 , wherein:
a specific surface area of the porous body is 300 m 2 /g or larger and 600 m 2 /g or smaller, and
a pore volume of the porous body is smaller than 1.5 ml/g.
12. The thermal insulation sheet according to claim 9 , wherein a bulk density of the thermal insulation sheet is 0.3 g/cm 3 or higher and 0.5 g/cm 3 or lower.
13. The thermal insulation sheet according to claim 9 , wherein a weight proportion of the porous body in the thermal insulation sheet is 50 wt % or higher.
14. The thermal insulation sheet according to claim 9 , wherein a weight proportion of the porous body in the thermal insulation sheet is 50 wt % or higher and 80 wt % or lower.
15. An electronic device comprising:
the thermal insulation sheet according to claim 9 ;
an electronic part having a heat generating property; and
a housing,
wherein the thermal insulation sheet is disposed between the electronic part and the housing.
16. A battery unit comprising:
the thermal insulation sheet according to claim 9 ; and
a plurality of batteries,
wherein the thermal insulation sheet is disposed between two adjacent batteries among the plurality of batteries.
17. A thermal insulation sheet comprising a thermal insulation material having a sheet shape, wherein:
a thickness of the thermal insulation sheet is in a range from 0.03 mm to 3.0 mm, inclusive,
a compressibility of the thermal insulation sheet at 5.0 MPa is 40% or lower, and
a thermal resistance of the thermal insulation sheet in compressing at 5.0 MPa is 0.01 m 2 K/W or higher.
18. The thermal insulation sheet according to claim 17 , wherein a bulk density of the thermal insulation sheet is 0.3 g/cm 3 or higher and 0.5 g/cm 3 or lower.
19. An electronic device comprising:
the thermal insulation sheet according to claim 17 ;
an electronic part having a heat generating property; and
a housing,
wherein the thermal insulation sheet is disposed between the electronic part and the housing.
20. A battery unit comprising:
the thermal insulation sheet according to claim 17 ; and
a plurality of batteries,
wherein the thermal insulation sheet is disposed between two adjacent batteries among the plurality of batteries.