JP2002103512A - Heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material capable of covering a continuous curved surface without cutting the same, excellent in water resistance or weatherability and not getting out of shape. SOLUTION: The heat insulating material is obtained by arranging metal foil layers on both surfaces of a bendable sheetlike laminate. In other embodiment, the heat insulating material is obtained by arranging fiber sheet layers on both surfaces of a bendable sheetlike laminate and further arranging metal foil layers on the surfaces of the fiber sheet layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material suitable for heat insulation of a high-temperature portion of an automobile, heat insulation of a heat medium pipe having a complicated shape, heat insulation of a continuous curved surface and a backing material of a building. is there.

[0002]

2. Description of the Related Art Insulating a high-temperature portion of an automobile, which is an assembly of complicated curved surfaces, is performed by cutting and pasting a heat insulating material so as to fit each curved surface. This operation requires several steps, which hinders labor saving.

A heat insulating material having excellent water resistance and weather resistance is hard and must be cut and pasted when wrapping a winding pipe. Further, a heat insulating material having a high degree of freedom in shape is soft and is inferior in water resistance and weather resistance.

[0004] Further, insulating a continuous curved surface requires a great deal of time and effort since a heat insulating material is cut and pasted so as to be fitted to each surface. Is accompanied.

[0005] In order to improve the efficiency of cooling and heating, a heat insulating material is used as a building backing material. Insulation materials used for such purposes include inorganic fibers such as glass wool on the back side of the outer wall and cork-type insulation materials. It takes time to cut and paste in the work such as.

[0006]

If a heat insulating material capable of covering a curved surface without losing its shape can be obtained, it can be easily screwed or simply wound around an exhaust portion or an engine portion of an automobile having a complicated shape. A heat insulating material can be attached, and the process can be labor-saving.

Further, if a heat-insulating material which is excellent in water resistance and weather resistance and has the same heat-insulating performance as that of the conventional product, and which can be fixed without being screwed or simply wound can be used without cutting and pasting the heat-insulating material. Therefore, work in a high place such as a building or a pipe or in a narrow space can be completed safely and quickly.

Accordingly, it is an object of the present invention to provide a heat insulating material which can cover a continuous curved surface without cutting and pasting, and is excellent in water resistance and weather resistance and does not lose its shape.

[0009]

That is, an object of the present invention is to provide a heat insulator characterized in that metal foil layers are provided on both sides of a foldable sheet-like laminate (hereinafter, referred to as a heat-insulating material). "First invention").

[0010] The present invention also provides a heat insulating material comprising a fiber sheet layer provided on both sides of a bendable sheet laminate, and a metal foil layer provided on the surface of the fiber sheet. (Hereinafter, referred to as “second invention”).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The heat insulating material according to the first invention of the present invention is characterized in that metal foil layers are provided on both surfaces of a bendable sheet laminate.

Here, examples of the foldable sheet laminate that can be used for the heat insulating material of the present invention include a ceramic sheet, a mill board, and a sheet laminate obtained by a papermaking method. It is preferable to use a sheet-like laminate obtained by the method.

The sheet-like laminate is made of, for example, 30 to 70% by mass of a water-insoluble or sparingly soluble clay, 20 to 60% by mass of ceramic fibers and / or mineral fibers, and pulp 3 to 1.
0 mass%, alumina 1-10 mass% and latex 1
An aqueous slurry consisting of a mixture of 10% by mass is paper-made, or 0.3 to
A slurry obtained by paper-making an aqueous slurry containing 10 parts by mass of metal soap is preferred.

The amount of the clay which is insoluble or hardly soluble in water used in the sheet laminate is 30 to 70.
%, Preferably from 40 to 60% by mass, more preferably from 40 to 50% by mass. If the amount of the clay which is insoluble or hardly soluble in water is more than 70% by mass, the heat insulating property is good, but the papermaking property is unfavorably deteriorated. On the other hand, if the amount is less than 30% by mass, heat insulation and heat resistance are undesirably reduced. The clay insoluble or hardly soluble in water is one or more selected from the group consisting of diatomaceous earth, heavy calcium carbonate, light calcium carbonate, kaolin, barium sulfate, aluminum hydroxide and magnesium hydroxide. can do. Among them, it is particularly preferable to use diatomaceous earth.

Next, the compounding amount of the ceramic fiber and / or mineral fiber used in the sheet laminate is 20 to 6%.
0 mass%, preferably 30 to 50 mass%, more preferably 40 to 50 mass%. When the amount of the ceramic fiber and / or the mineral fiber exceeds 60% by mass,
Although the occurrence of cracks at the time of bending is reduced, the drainage becomes too good and the papermaking property is lowered, which is not preferable.
If the amount is less than 20% by mass, clay insoluble or hardly soluble in water cannot be adsorbed, which is not preferable. It is preferable to use ceramic fibers rather than mineral fibers. Here, examples of the ceramic fiber include alumina fiber, silica fiber, silica alumina fiber, zirconia fiber, rock wool, and the like, and among these, silica alumina fiber is preferably used. Examples of mineral fibers include sepiolite and wollastonite, and among these, it is preferable to use sepiolite.

The amount of the pulp used in the sheet laminate is in the range of 3 to 10% by mass, preferably 4 to 8% by mass, and more preferably 5 to 7% by mass. When the blending amount of the pulp exceeds 10% by mass, the amount of clay insoluble or hardly soluble in water increases, the papermaking property becomes good, and the strength of the sheet laminate increases, but the heat resistance decreases. Not preferred. On the other hand, if the amount is less than 3% by mass, the strength of the sheet laminate is undesirably reduced.

Next, the compounding amount of alumina used in the sheet laminate is in the range of 1 to 10% by mass, preferably 2 to 8% by mass, more preferably 4 to 6% by mass. If the amount of alumina exceeds 10% by mass, the sheet-like laminate becomes hard, and cracks may occur at the time of bending, which is not preferable. On the other hand, if the amount is less than 1% by mass, the heat resistance of the sheet-like laminate deteriorates, which is not preferable. In addition, normal alumina can be used as alumina.

Further, the compounding amount of the latex used in the sheet-like laminate is 1 to 10% by mass, preferably 2 to 8% by mass.
% By mass, more preferably in the range of 3 to 5% by mass.
If the compounding amount of the latex exceeds 10% by mass, the heat resistance of the sheet-like laminate deteriorates, which is not preferable. Also,
If the compounding amount is less than 1% by mass, the strength of the sheet-like laminate is reduced or delamination occurs, which is not preferable. As latex, natural latex,
Synthetic latex such as SBR, polystyrene, polyvinyl acetate, acrylate resin and the like can be used.

The sheet-like laminate is prepared by adding water to a mixture having the components and the proportions as described above, and adding a solid content of 0.2 to 0.8% by mass, preferably 0.3 to 0.6% by mass. % Of an aqueous slurry, and the obtained aqueous slurry is formed into a sheet-like laminate by papermaking so as to have a predetermined thickness by a papermaking method. Here, when the solid content concentration of the aqueous slurry at the time of papermaking is less than 0.2% by mass, the papermaking efficiency is deteriorated, which is not preferable.
Exceeding the mass% is not preferable because the dispersion of the fibers becomes worse. The sheet-like laminate obtained by the papermaking method can be used as an inorganic sheet of the heat insulating material according to the first invention of the present invention if it is dried by a conventional method.

According to another aspect of the sheet-like laminate which is preferably used as the inorganic sheet of the heat insulating material according to the first invention of the present invention, the amount of the outer layer is 0.1 to 100 parts by mass of the mixture. 3 to 10 parts by mass, preferably 0.5 to 6 parts
Water resistance can also be imparted by adding 1 part by weight, more preferably 1 to 5 parts by weight of a metal soap. Here, if the amount of the metal soap exceeds 10 parts by mass with respect to 100 parts by mass of the mixture, it is not preferable because the interlayer strength of the sheet-like laminated pair decreases. On the other hand, if the amount is less than 0.3 parts by mass, it is not preferable because the addition effect is not exhibited. Examples of the metal soap include stearic acid-based metal soaps such as aluminum stearate, zinc stearate, calcium stearate, and barium stearate, and oleic acid-based metal soaps such as calcium oleate. Or two or more of them may be used in combination. It is particularly preferable to use calcium stearate as the metal soap.

The sheet-like laminate of this embodiment can be obtained by the same papermaking operation as that of the above-mentioned sheet-like laminate except that an aqueous slurry obtained by adding and blending a metal soap to the above mixture is used.

The heat insulating material according to the first invention of the present invention is obtained by arranging metal foil layers on both sides of a foldable sheet-like laminate, wherein the metal foil is, for example, aluminum foil, stainless steel or the like. Foil, gold foil, silver foil, brass foil, copper foil and tin foil can be used, and the use of aluminum foil is particularly preferred. In addition, it is preferable to use a metal foil having gloss in order to efficiently reflect radiant heat. The thickness of the metal foil is not particularly limited, but is, for example, 5 to 200 μm, preferably 50 to 200 μm.
It is within the range of 200 μm. The metal foil may be embossed.

The disposition of the metal foil layers on both sides of the foldable sheet-like laminate can be performed by bonding to both sides of the sheet-like laminate using a heat-resistant adhesive. In addition, as the heat resistant adhesive, for example, a phenol-based adhesive can be used.

Alternatively, the metal foil may be formed in a bag shape,
It is also possible to adopt a configuration in which the sheet laminate is simply inserted therein. When the sheet-like laminate is inserted into the bag-like metal foil, an adhesive may be applied to both surfaces of the laminate to bond the metal foil and the laminate. Further, the bag-shaped metal foil may have a configuration in which the ends may be completely bonded, and the ends are intermittently bonded to such an extent that the inserted sheet-like laminate does not protrude outside. can do. However, if all the ends are completely bonded, when the heat insulating material is exposed to heat, the air inside the bag may expand due to heat and the bag made of metal foil may burst. Preferably, at least a part of the inside of the bag is configured to communicate with the external atmosphere.

Next, the heat insulating material of the second invention of the present invention comprises a fiber sheet layer provided on both sides of a bendable sheet laminate, and a metal foil layer provided on the surface of the fiber sheet. It is characterized by becoming. By providing a fiber sheet between the bendable sheet laminate and the metal foil layer, the heat insulating property of the heat insulating material of the first invention can be further enhanced. Here, the foldable sheet-like laminate and metal foil that can be used in the second invention of the present invention are the same as in the first invention.

Further, the fiber sheet usable in the second invention of the present invention is a metal fiber sheet or an inorganic fiber sheet. Here, as the metal fiber sheet, for example, iron fiber,
Examples include sheets made of stainless steel fiber, copper fiber, or aluminum fiber. Examples of the inorganic fiber sheet include a sheet made of carbon fiber, glass fiber, or silica fiber.
Although the thickness of the fiber sheet is not particularly limited, for example, 0.1 to 2 mm, preferably 0.5 to 1 mm
Is within the range.

In the second invention of the present invention, the fiber sheet layers are provided on both sides of the foldable sheet-like laminate, and the metal foil layer is provided on the surface of the fiber sheet. It can be performed by bonding using a heat-resistant adhesive, or by inserting a bendable sheet laminate and a fiber sheet into a bag-shaped metal foil. In addition, when inserting the sheet-like laminate and the fiber sheet into the bag-like metal foil, the metal foil and the fiber sheet and / or the fiber sheet and the sheet-like laminate are bonded using an adhesive as necessary. You can also.

[0028]

EXAMPLES The heat insulating material of the present invention will be further described below with reference to examples. Preparation of bendable sheet laminate (1): diatomaceous earth 4
8 mass%, silica alumina fiber 38 mass%, alumina 6
Water was added to a mixture having a blending ratio of 5% by mass, 5% by mass of pulp, and 3% by mass of SBR latex to prepare an aqueous slurry having a solid concentration of 0.4%. Next, using the obtained aqueous slurry, papermaking is repeated 3 to 4 times with a round-mesh type papermaking machine to make the paper 500 mm x 2000 mm x 1 m thick.
m of the sheet-like laminate was obtained. The obtained sheet-like laminate was dried in a dryer at 100 to 180 ° C for about 15 to 20 minutes to obtain a bendable sheet-like laminate (1).

Preparation of bendable sheet laminate (2): 100% by weight of a composition comprising 48% by weight of diatomaceous earth, 38% by weight of silica-alumina fiber, 6% by weight of alumina, 5% by weight of pulp and 3% by weight of SBR latex Water was added to a mixture having 3.5 parts by weight of calcium stearate on a part-by-part basis to prepare an aqueous slurry having a solid content concentration of 0.4%. Next, using the obtained aqueous slurry, papermaking is repeated 3 to 4 times with a round-mesh papermaking machine to form a paper.
A sheet laminate having a size of mm × 2000 mm × thickness 1 mm was obtained. The obtained sheet laminate was dried in a dryer at 100 to 180 ° C. for about 15 to 20 minutes to obtain a bendable sheet laminate (2).

Example 1 A bag made of aluminum foil having a shape of 60 mm × 110 mm × 0.1 mm in thickness was placed in a bag of 50 mm × 100 mm × 1 thickness.
The heat insulating material (1) of the present invention was produced by inserting four sheet-like laminates (1) that can be bent and having a part of the opening of the bag bonded. 800 of the obtained heat insulating material (1)
The surface layer on the heat source side from the heat source of ° C. was placed so as to be 15 mm, and after 180 minutes, the temperature of the heat source side and the surface of the aluminum foil surface on the back surface were measured. Table 1 shows the obtained results.

Example 2 A bag made of aluminum foil having a shape of 60 mm × 110 mm × 0.1 mm in thickness was placed in a bag of 50 mm × 100 mm × 1 thickness.
4 mm foldable sheet-like laminate (1) and a laminate of 50 mm x 100 mm x 0.2 mm thick carbon fiber sheets on both sides are inserted and a part of the opening of the bag is bonded. Thus, the heat insulating material (2) of the present invention was produced.
Various characteristics of the obtained heat insulating material (2) were measured in the same manner as in Example 1. Table 1 also shows the obtained results.

Example 3 A bag made of aluminum foil having a shape of 60 mm × 110 mm × 0.1 mm in thickness was placed in a bag of 50 mm × 100 mm × 1 thickness.
4 mm foldable sheet-like laminate (2) and 50 mm x 100 mm x 0.3 mm thick carbon fiber sheets laminated on both sides are inserted, and a part of the opening of the bag is bonded. Thus, the heat insulating material (3) of the present invention was produced.
Various characteristics of the obtained heat insulating material (3) were measured in the same manner as in Example 1. Table 1 also shows the obtained results.

Comparative Example 1 A carbon fiber sheet of 50 mm × 100 mm × 0.4 mm in thickness was inserted into a bag made of aluminum foil having a shape of 60 mm × 110 mm × 0.1 mm in thickness. A comparative heat insulating material was produced by bonding. Various properties of the obtained heat insulating material of the comparative product were measured in the same manner as in Example 1. Table 1 also shows the obtained results.

[0034]

[Table 1]

REFERENCE EXAMPLE The heat insulating materials (1) to (3) obtained in the above Examples 1 to 3 are wound around a pencil for three layers, and then returned to the original state to remove the aluminum foil and form an inner sheet. Observation of the state of the laminate showed no occurrence of cracks or the like. The heat insulating materials (1) to (3) could be wound around the pencil without any gap. In addition, heat insulating materials (1) to (3) are
After repeating the 0-degree bending 10 times, the aluminum foil was removed, and the state of the internal sheet-like laminate was observed. As a result, no cracks or the like occurred.

[0036]

As described above, according to the present invention, the radiant heat can be efficiently reflected by arranging the metal foil layers on both sides of the bendable sheet laminate, and the water resistance and the water resistance can be improved. Despite being a heat insulating material with excellent weather resistance, it can freely respond to curved surfaces of various shapes and does not require cutting and pasting,
It is possible to provide a heat insulating material suitable for heat insulation of a high temperature part of an automobile, heat insulation of a heat medium pipe having a complicated shape, and heat insulation of a surface having a continuous curved surface and a backing material of a building.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kanji Hiraguri 1488, Kawadaimoncho, Ichihashiro-gun, Nishi-Yatsushiro-gun, Yamanashi Pref. Inventor Mariko Yamamoto 1488 Kawadaimon-cho, Nishi-Yatsushiro-gun, Yamanashi Pref. Inside Askecnica Co., Ltd. HA32 HA34 HB03 HB04 HB05 JA00 JA06 JA21 JA28 JC02 3D038 BA07 BC20 4F100 AA00B AA00D AA00E AA07B AA08B AA18B AA19B AA20B AA20D AA20E AA27B AA33B AB01A AB01C AB01D AB01E AB02D AB02E AB04A AB04C AB04D AB04E AB10A AB10C AB10D AB10E AB17A AB17C AB17D AB17E AB18A AB18C AB24A AB24C AB25A AB25C AB31A AB31C AB33A AB33C AC00B AC02B AC0 3B AC10B AD00B AD11D AD11E AG00D AG00E AH08B AJ04B AK01B BA03 BA05 BA06 BA10A BA10C DG01B DG01D DG01E EH41B GB07 GB32 JB07 JB11B JJ02 JL09 JM01B 4L055 AF05 AF09 AG17 AG25 AG34 A63 AG01

Claims (13)

[Claims] 1. A heat insulating material comprising metal foil layers disposed on both sides of a bendable inorganic sheet. 2. A heat insulating material comprising: a fiber sheet layer provided on both sides of a bendable inorganic sheet; and a metal foil layer provided on the surface of the fiber sheet. 3. The heat insulating material according to claim 1, wherein the foldable inorganic sheet is a sheet-like laminate obtained by a papermaking method. 4. A sheet-like laminate comprising 30 to 70% by mass of a clay insoluble or hardly soluble in water, ceramic fiber and / or
Alternatively, 0.3 to 10 parts by mass of metal soap is externally contained in 100 parts by mass of a mixture of 20 to 60% by mass of mineral fiber, 3 to 10% by mass of pulp, 1 to 10% by mass of alumina and 1 to 10% by mass of latex. The heat insulating material according to claim 3, which is obtained by paper-making the aqueous slurry thus obtained. 5. A sheet-like laminate comprising 30 to 70% by mass of a water-insoluble or poorly-soluble clay, ceramic fiber and / or
Alternatively, 0.3 to 10 parts by mass of metal soap is externally contained in 100 parts by mass of a mixture of 20 to 60% by mass of mineral fiber, 3 to 10% by mass of pulp, 1 to 10% by mass of alumina and 1 to 10% by mass of latex. The heat insulating material according to claim 3, which is obtained by paper-making the aqueous slurry thus obtained. 6. The water-insoluble or hardly-soluble clay is one or more selected from the group consisting of diatomaceous earth, heavy calcium carbonate, light calcium carbonate, kaolin, barium sulfate, aluminum hydroxide and magnesium hydroxide. The heat insulating material according to claim 4 or 5, wherein 7. The ceramic fiber according to claim 4, wherein the ceramic fiber is at least one member selected from the group consisting of alumina fibers, silica-alumina fibers, silica fibers, zirconia fibers, and rock wool. Insulation as described. 8. The heat insulating material according to claim 4, wherein the mineral fibers are one or more selected from the group consisting of sepiolite and wollastonite. 9. The metal soap is aluminum stearate,
The heat insulating material according to any one of claims 5 to 8, wherein the heat insulating material is at least one member selected from the group consisting of zinc stearate, calcium stearate, barium stearate, and calcium oleate. 10. The metal foil is one or more kinds selected from the group consisting of an aluminum foil, a stainless steel foil, a gold foil, a silver foil, a brass foil, a copper foil and a tin foil. The heat insulating material according to claim 1. 11. The heat insulating material according to claim 2, wherein the fiber sheet is a metal fiber sheet or an inorganic fiber sheet. 12. The heat insulating material according to claim 11, wherein the metal fiber sheet is made of iron fiber, stainless fiber, copper fiber or aluminum fiber. 13. The heat insulating material according to claim 11, wherein the inorganic fiber sheet is made of carbon fiber, glass fiber or silica fiber.