Thermal insulator, thermal sheet using the same, and method for manufacturing the thermal insulator

Abstract

Provided is an insulator that is easy to align when arranged in an apparatus. At least one face of an insulator (12) that carries a xerogel in the interior of a nonwoven fabric (11) is provided with a plurality of protrusions (13). By so configuring, fine adjustment of position and the like is easy when the insulator (12) is arranged, the insulating effect can be increased by an amount corresponding to the amount of protrusions (13) added to the thickness, and the insulator can be used for the insulation of a wide variety of apparatuses.

Description

Technical Field

[0001] This disclosure relates to an insulation material used as a heat insulation countermeasure, an insulation sheet using the insulation material, and a method for manufacturing the insulation material. Background Technology

[0002] In recent years, energy conservation has been strongly promoted, and one method to achieve this is through equipment insulation to improve energy efficiency. To achieve this insulation, insulating sheets with excellent thermal insulation properties are required. Therefore, sometimes insulating materials with a lower thermal conductivity than air are used, achieved by loading silica dry gel onto nonwoven fabric.

[0003] In addition, prior art literature information related to this technology, for example, is known as Patent Document 1.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-136859 Summary of the Invention

[0007] However, because the aforementioned insulation material has a basically flat structure, even when it is aligned in the equipment, it is sometimes stuck to the original placement location, making alignment difficult.

[0008] To address the aforementioned issues, the insulation body of this disclosure has a nonwoven fabric that carries a dry gel in an internal space, and a plurality of protrusions disposed on at least one side of the nonwoven fabric.

[0009] Based on the above structure, an insulator and an insulating sheet that are easy to align can be obtained, and the protrusion can be further used to improve the insulation effect. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the insulation body in one embodiment of the present disclosure.

[0011] Figure 2 This is a top view of the insulation body in one embodiment of the present disclosure.

[0012] Figure 3 This is a cross-sectional view of another insulation body in one embodiment of this disclosure.

[0013] Figure 4 This is a cross-sectional view of the insulation sheet in one embodiment of the present disclosure.

[0014] Figure 5 This is a cross-sectional view of another insulation sheet in one embodiment of this disclosure. Detailed Implementation

[0015] Hereinafter, an insulation sheet in one embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0016] Figure 1 This is a cross-sectional view of the insulation body according to one embodiment of the present disclosure. Figure 2 This is a top view of the heat insulation body in one embodiment of the present invention.

[0017] The insulation 12 is constructed by loading silica degelatin (not shown) into the spaces of a nonwoven fabric 11 made of polyethylene terephthalate (PET) with internal spaces. The nonwoven fabric 11 is composed of PET fibers with an average fiber thickness of approximately 10 μm, and the space occupies approximately 90% of the nonwoven fabric 11. The silica degelatin has nanoscale spaces within it, therefore the thermal conductivity of the portion filled with the silica degelatin is 0.018–0.024 W / m·K, which is less than the thermal conductivity of air. Furthermore, this silica degelatin is a generalized degelatin in a gel-dried state, and can be obtained not only through conventional drying but also through supercritical drying, freeze-drying, and other methods.

[0018] Here, the insulation 12 has a thickness of approximately 0.3 mm and a size of approximately 100 mm square. It is configured such that a protrusion 13 is provided on one side of the insulation 12, which partially protrudes from the one side. The height of the protrusion 13 from the one side is approximately 0.03 mm, the diameter is approximately 3 mm, and the shortest distance between the centers of the protrusions 13 is approximately 15 mm.

[0019] Therefore, even if the surface with the protrusion 13 is placed in the designated position, contact will only occur through the protrusion, and thus no adhesion will occur. This allows for easy fine-tuning of the position. Furthermore, the insulation effect can be improved by increasing the thickness by the amount of the protrusion 13.

[0020] When the thickness of the insulation 12 is set to t, the height of the protrusion 13 is preferably 0.05t or more and 0.15t or less. This is because if the height is less than 0.05t, the effect of the invention disclosed herein becomes smaller, and if it is greater than 0.15t, it is difficult to maintain the shape.

[0021] Furthermore, when the thickness of the insulation 12 is set to t, the arrangement of the protrusions 13 preferably sets the shortest distance between the protrusions 13 to be 30t or more and 80t or less. This is because if the distance is less than 30t, the contact area increases and the inventive effect of the present disclosure becomes smaller; if it is greater than 80t, the insulation 12 bends and the inventive effect of the present disclosure becomes smaller.

[0022] In addition, such as Figure 3As shown, protrusions 13 can also be provided on both sides of the insulation 12. In this case, it is preferable that the positions of the protrusions 13 are different on the two sides. If protrusions 13 are provided on the insulation 12, deformation is likely to occur near the protrusions 13, so it is preferable that the positions are different on the two sides.

[0023] Figure 4 This is a cross-sectional view of the insulation sheet using an insulation body according to one embodiment of the present disclosure. Insulation body 12 and Figure 1 Similarly, it is constructed by loading silica dry gel into the space of a nonwoven fabric made of PET with internal spacing. The heat insulation body 12 has a thickness of about 0.3 mm and a height of about 0.03 mm. The protrusions 13 are arranged such that the shortest distance between the centers of the protrusions 13 is about 15 mm. The heat insulation body 12 is completely covered by an insulating film 14 made of PET with a thickness of about 0.01 mm to form an insulation sheet 15. By covering the heat insulation body 12 with an insulating film 14 that is thinner than the height of the protrusions 13, the insulating film 14 can be deformed along the surface of the heat insulation body 12, and an insulation sheet 15 that is not easy to stick to the installation position can be formed. In addition, tiny spaces 17 can be formed around the protrusions 13, which are enclosed within the insulating film 14, thereby further improving the heat insulation effect.

[0024] Figure 5 This is a cross-sectional view of another insulation sheet using the insulation body in one embodiment of the present disclosure. The insulation sheet 15 is constructed by stacking two insulation bodies 12 and covering the entire sheet with an insulating film 14. Protrusions 13 are provided on opposite surfaces of the insulation bodies 12, and an insulating sheet 16 is sandwiched between the insulation bodies 12. More preferably, the positions of the protrusions 13 on the opposite surfaces are different from each other. The insulating sheet 16 is preferably made of a sheet that does not allow air to pass through, such as PET. With this configuration, the space in the area sandwiched between the insulation bodies 12 is divided by the insulating sheet 16, which can hinder heat conduction caused by air convection and further improve the insulation effect.

[0025] Next, a method for manufacturing the heat insulation body according to one embodiment of the present disclosure will be described.

[0026] First, prepare a nonwoven fabric made of PET with a thickness of approximately 0.3 mm. Immerse the nonwoven fabric in a sol solution, for example, formed by adding hydrochloric acid to an aqueous solution of sodium silicate, allowing the sol solution to permeate the internal spaces of the nonwoven fabric. Gel the sol solution, hydrophobize it, and dry it, thereby filling the internal spaces of the nonwoven fabric with silica dry gel. Before the sol solution is completely dry, only a portion of the surface of the nonwoven fabric is vacuum-adsorbed, causing the adsorbed portion to bulge and become protrusions. By allowing it to dry completely, an insulation material with multiple protrusions on its surface can be obtained.

[0027] The size, configuration, and height of the protrusions can be determined by the shape and configuration of the holes in the vacuum adsorption plate and the intensity of the vacuum pumping.

[0028] Next, two heat insulation sheets 12 are stacked on top of each other, and the whole structure is covered with an insulating film 14. This results in a heat insulation sheet 15.

[0029] Furthermore, in the above embodiment, the materials of the nonwoven fabric 11, the protrusions 13, and the insulating film 14 are all PET, but they can also be resin materials other than PET. In addition, the materials of the nonwoven fabric 11, the protrusions 13, and the insulating film 14 can be different from each other.

[0030] Industrial availability

[0031] The heat insulation body and the heat insulation sheet using the heat insulation body disclosed herein can be easily aligned and are useful in industry.

[0032] Explanation of reference numerals in the attached figures

[0033] 11. Non-woven fabric

[0034] 12 Insulators

[0035] 13. Protrusion

[0036] 14 Insulating film

[0037] 15 heat insulation sheets

[0038] 16 Insulating sheets

[0039] 17. Space.

Claims

1. A heat insulation sheet, comprising: Insulators; and An insulating film covers the entire heat insulation body. The insulation body comprises: a nonwoven fabric that carries a dry gel in its internal space; and a plurality of protrusions disposed on at least one side of the nonwoven fabric. When the thickness of the nonwoven fabric is set to t, the shortest distance between the protrusions is set to be more than 30t and less than 80t, and the height of the protrusions is set to be more than 0.05t and less than 0.15t. The heat insulation sheet has multiple heat insulation elements and includes an insulating sheet. The plurality of insulating bodies are stacked with the protruding surfaces facing each other. The insulating sheet is sandwiched between the surfaces of the plurality of heat insulators where the protrusions are located. The insulating film is used to cover the side of the plurality of heat insulators opposite to the side where the protrusion is located.

2. A type of heat insulation sheet, The device comprises multiple heat insulators and an insulating sheet covering the entire heat insulator. Each heat insulator includes: a nonwoven fabric carrying a dry gel within its internal space; and multiple protrusions disposed on at least one side of the nonwoven fabric. The plurality of insulating bodies are stacked with the protruding surfaces facing each other. The insulating sheet is sandwiched between the surfaces of the plurality of heat insulators where the protrusions are located. The side of the plurality of heat insulators opposite to the side where the protrusions are located is covered with an insulating film.

3. The heat insulation sheet according to claim 2, wherein, When the thickness of the nonwoven fabric is set to t, the height of the protrusion is set to be more than 0.05t and less than 0.15t.

4. The heat insulation sheet according to claim 2, wherein, When the thickness of the nonwoven fabric is set to t, the shortest distance between the protrusions is set to be more than 30t and less than 80t.

5. The heat insulation sheet according to claim 1 or 2, wherein, The protrusions are disposed on both sides of the nonwoven fabric, such that the positions of the protrusions on the two sides are different when viewed from above.

6. A method for manufacturing a heat insulation material, comprising the following steps: The nonwoven fabric with internal space is impregnated with a specified sol solution, so that the dry gel permeates the internal space of the nonwoven fabric; The nonwoven fabric impregnated with the dry gel is dried to obtain an insulation material; While the dry gel is not completely dry, a portion of at least one side of the nonwoven fabric is vacuum-adsorbed, thereby forming multiple protrusions; and The surface of the heat insulation body is covered with an insulating film.

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