Thermal insulation and method of producing the same

Patent metadata

Field	Value
Publication number	US-2016305597-A1
Application number	US-201615192194-A
Country	US
Kind code	A1
Filing date	Jun 24, 2016
Priority date	Oct 16, 2009
Publication date	Oct 20, 2016
Grant date	—

Abstract

Provided is a thermal insulation having both excellent thermal insulating performance and excellent strength, and a method of producing the same. A method of producing a thermal insulation according to the present invention includes curing (S 2 ) a dry-pressed compact, including silica fine particles each having an average particle diameter of 50 nm or less and a reinforcement fiber, at a relative humidity of 70% or more.

First claim

What is claimed is:

1 . A method of producing a thermal insulation, comprising curing a dry-pressed compact containing silica fine particles each having an average particle diameter of 50 nm or less and a reinforcement fiber, at a relative humidity of 70% or more.

2 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact is free of a binder.

3 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact comprises 50 to 98 mass % of the silica fine particles and 2 to 20 mass % of the reinforcement fiber.

4 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact comprises at least one selected from the group consisting of an alkaline-earth metal hydroxide and an alkali metal hydroxide.

5 . The method of producing a thermal insulation according to claim 4 , wherein the dry-pressed compact comprises at least one selected from the group consisting of the alkaline-earth metal hydroxide and the alkali metal hydroxide, each at 0.1 to 10 parts by weight with respect to 100 parts by weight of a raw material for the thermal insulation comprising the silica fine particles, and the reinforcement fiber.

6 . The method of producing a thermal insulation according to claim 1 , wherein the thermal insulation has a bulk density of 190 to 600 kg/m 3 and has a compressive strength of 0.65 MPa or more.

7 . The method of producing a thermal insulation according to claim 1 , wherein the thermal insulation has a thermal conductivity at 600° C. of 0.05 W/(m·K) or less.

8 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact comprises Ca(OH) 2 .

9 . The method of producing a thermal insulation according to claim 8 , wherein the dry-pressed compact comprises the Ca (OH) 2 at 0.1 to 10 parts by weight with respect to 100 parts by weight of a raw material for the thermal insulation comprising the silica fine particles, and the reinforcement fiber.

10 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact is cured at a temperature of 40° C. to 95° C. and a duration of 2 hours or more.

11 . The method of producing a thermal insulation according to claim 8 , wherein the dry-pressed compact comprises the Ca (OH) 2 at 1 to 10 parts by weight with respect to 100 parts by weight of a raw material for the thermal insulation comprising the silica fine particles, and the reinforcement fiber.

12 . The method of producing a thermal insulation according to claim 1 , wherein the curing is conducted in an autoclave.

13 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact is cured at 40° C. to 200° C. for 2 hours or more under a pressurized condition.

14 . The method of producing a thermal insulation according to claim 1 , wherein the method further comprises drying the cured dry-pressed compact.

15 . The method of producing a thermal insulation according to claim 1 , wherein the dry-pressed compact further comprises a thermal radiation scattering material.

16 . The method of producing a thermal insulation according to claim 15 , wherein the thermal radiation scattering material is at least one selected from the group consisting of silicon carbide, zirconia and titania.

17 . The method of producing a thermal insulation according to claim 15 , wherein the dry-pressed compact comprises 50 to 93 mass % of the silica fine particles, 2 to 20 mass % of the reinforcement fiber, and 5 to 40 mass % of the thermal radiation scattering material.

18 . The method of producing a thermal insulation according to claim 4 , wherein the dry-pressed compact is obtained by subjecting a raw material for the thermal insulation comprising the silica fine particles and the reinforcement fiber, and at least one of the alkaline-earth metal hydroxide and the alkali metal hydroxide to dry mixing, and subjecting the dry mixture to dry-press forming.

Assignees

• Nichias Corp

Inventors

• Ito Yasuo
• Goto Yoshihiko
• Abe Isami
• Nakama Shigeru
• Ohmura Takahiro

Classifications

• F16L59/028 Primary

  Compositions for or methods of fixing a thermally insulating material · CPC title

• E04B2001/742

  Use of special materials; Materials having special structures or shape · CPC title

• C04B30/02 Primary

  containing fibrous materials · CPC title

• C04B2201/50

  for the mechanical strength · CPC title

• E04B1/80

  slab-shaped · CPC title