JPH06114979A - Heat-insulating composite material - Google Patents

Abstract

PURPOSE: To obtain excellent heat insulating properties, weatherability, steam permeability and buoyancy characteristics by providing humidity permeable membranes of a thermoplastic material to both surfaces of a weldable heat insulating fiber material based on a thermoplastic material and fusing them to form a large number of air sealed independent spaces. CONSTITUTION: Humidity permeable membranes 2, 3 are superposed on both surfaces of a heat insulating fiber material and two humidity permeable membranes 2, 3 and the heat insulating fiber material are fused at fused parts 4 to form independent spaces 5. The air in the structure of the heat insulating fiber material and the air between the humidity permeable membranes 2, 3 are sealed in these spaces and do not communicate with the adjacent spaces 5. As a result, comfortableness is imparted to a wearer because this composite material has properties not passing water but passing steam and excludes the moisture from the inside thereof as steam while prevents the penetration of water from the outside. By the selection of the outside permeable membranes, weatherability against a wind, rain, snow or water is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to clothing, gloves, winter shoes,
The present invention relates to a heat insulating composite material having a wide range of applications such as jackets, sheets, blankets and hats.

[0002]

2. Description of the Related Art For heat insulating cotton and the like for clothing, a melt blow fine fiber material, a thin insulation heat insulating material in which staple fibers are usually mixed, is well known. Even more commonly used is card cotton, which is composed entirely of staple fibers. However, since these fiber materials are not resistant to rain, wind, snow, water, etc.,
When weather resistance is required, it is indispensable to superimpose it on the outer woven fabric on which a moisture permeable film is attached or a shielding resin is applied. However, this structure often impairs the softness of the outer woven fabric. In fact, in the case of a soft woven cloth, in order to maintain the softness, a strong water-repellent treatment with a fluororesin or a silicone resin is performed instead of the film bonding. However, these water repellent treatments are only satisfactory for light conditions. Moreover, it is difficult to attach a wrinkled material to a film. Therefore, the design of clothes is limited.

Cardboard cotton, melt-blown fine fibers, wool felt and the like are used as heat insulating fiber materials for winter shoes and gloves. In order to withstand water, rain, and snow, a sheet material having a moisture permeable membrane laminated on only one side thereof is sometimes used in combination with a heat insulating fiber material. However, the air heated by the pump action is pushed out to the outside during use, so that there is often a drawback that sufficient heat insulation cannot be exhibited.

Further, as the buoyancy material, closed cell polymer foam, mainly polyethylene foam, is used. Closed-cell foams have excellent buoyancy properties, but have the drawback of being uncomfortable due to humidity from perspiration because they are not water vapor permeable. For this reason, the specific life-saving device is limited to a partial or additional outer apparel such as a jacket or a vest.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a heat insulating fiber material having both surfaces adhered with a moisture permeable membrane has excellent heat insulating properties, impermeability to water, rain, snow, wind, etc., water vapor permeability, It is intended to provide a new type of heat insulating composite material having buoyancy characteristics, water vapor permeability adjusting function and the like.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a heat-insulating fiber material having the above-mentioned characteristics, which is made of a thermoplastic material as a main material, and is capable of being melt-bonded, and the heat-bondable heat-insulating fiber. Comprising at least two fusible, vapor permeable membranes of thermoplastic material disposed on both sides of the material, formed by fusing the at least two permeable membranes and the fusible heat insulating fibrous material An insulating composite material having a large number of air-filled independent spaces is provided.

[0007]

In the heat insulating composite material of the present invention, since both surfaces of the heat insulating fiber material are covered with the moisture permeable film,
Water has a property of not allowing water to pass through, but has a property of allowing water vapor to pass therethrough. Therefore, it is possible to remove water from the inside as water vapor while preventing the intrusion of water from the outside, which gives comfort to the wearer. In addition, wind, rain, snow, and
Climatic resistance to water etc. is obtained. Further, by appropriately selecting the moisture permeability of the outer moisture permeable film and the moisture permeability of the inner moisture permeable film, dew condensation on the inner surface of the outer moisture permeable film can be prevented.

Furthermore, since a large number of independent spaces are formed by fusing the two moisture permeable membranes and the heat insulating fiber material inside, the air is not convected, the heat insulating property is enhanced, and the independent spaces are formed. There is also an advantage that buoyancy is given as a whole because of the enclosed air. Since it has the above-mentioned properties, it is used, for example, in the following applications. (1) Clothing that requires climate resistance. As described above, since the heat insulating material of the present invention itself has climate resistance, it is possible to completely freely select and stack the outer fabric material on this outer surface, and the ski wear, the sports wear having the desired appearance and feel, It is possible to make a motorbike suit and the like.

(2) Applications requiring water resistance, heat insulation under pressure, and bulkiness. The heat insulating material of the present invention prevents water from entering, and on the other hand, since air is enclosed in the independent space and does not move, cold weather shoes, gloves, blankets, livestock and plants requiring heat resistance and bulk under pressure. Suitable for use as cover sheet for etc. (3) Applications that require buoyancy. The heat insulating material of the present invention has a buoyancy property because it uniformly contains a large amount of air, and since it has moisture retention and moisture permeability, for example, buoyancy clothes, buoyancy pants, buoyancy underwear, buoyancy work clothes, Can be used for life jacket etc.

[0010]

DETAILED DESCRIPTION FIG. 1 is a cross-sectional view of an example of a heat insulating composite material of the present invention, in which a moisture permeable film 2 is formed on both sides of a heat insulating fiber material 1.
And 3 are overlapped, and the two moisture-permeable membranes 2 at 4
3 and the heat insulating fiber material 1 are fused together to form the independent space 5. The space is filled with the air in the tissue of the heat insulating fiber material 1 and the air between the heat insulating fiber material and the moisture permeable membranes 2 and 3, and does not communicate with the adjacent space 6.

FIG. 2 shows various embodiments A to D of one independent space of the heat insulating composite material of the present invention. A is the same as that shown in FIG. 2A to 2D have the same basic structure in which the heat insulating fiber material 1 and the moisture permeable membranes 2 and 3 sandwiching the heat insulating fiber material 1 are fused at 4 to form an independent space, but the heat insulating fiber material is common. Two sheets 1 are stacked, and a reinforcing material 7 is inserted between them. In C, two reinforcements 8
And 9 are disposed between the heat insulating fiber material 1 and the moisture permeable membranes 2 and 3. In some cases only one of the reinforcements 8 and 9 may be present. In D, the reinforcing materials 10 and 11 are arranged outside the moisture permeable membranes 2 and 3. Also in this case, only one of the reinforcing members 10 and 11 may be present.

Incidentally, the plane shape of the independent space can take various shapes as shown in FIG. The volume of the independent space can be various sizes, and is usually 0.1 to 200 cm ³ , though it depends on the thickness of the heat insulating cotton, the use of the final product and the like. If the volume is too large, there are problems that the adiabaticity deteriorates due to the convection of air in the independent space, and the uniform thickness cannot be maintained due to the movement of air under pressure. Further, if the volume is too small, manufacturing difficulties will occur.

The moisture permeable film used in the present invention is a film made of a thermoplastic resin having a melting property, or a composite film of this film and another film, which is measured by the TAPPI T-460 method or JIS P 8117 method. The breathable resistance is 1,800 seconds / 6.45 cm ² · 100 ml or more, J
500 when measured according to IS Z 0280 B
Those having a water vapor permeability of g / m ² · 24 hr (40 ° C., relative humidity 90%) or more, a film thickness of 5 to 50 μm, and flexibility and stretchability are preferable. As long as the film has such properties, a thermoplastic polyurethane film, natural rubber, ethylene-maleic anhydride (EMA), ethylene-
Membranes made of various materials such as methacrylic acid copolymer (EMMA), polyvinyl alcohol (PVA), polyolefins such as polypropylene, polytetrafluoroethylene (PTFE) membranes can be used. this house,
In particular, a thermoplastic polyurethane film is preferable, and a thermoplastic polyurethane having improved moisture permeability by introducing a hydrophilic segment is particularly preferable. It is convenient to use a polyol component, especially polyglycol, as the hydrophilic component. Such a thermoplastic polyurethane is usually 10 to 30.
μm film thickness and 500g-8,000g / m ² · 24hr
It has a water vapor permeability of.

For the purpose of improving the strength, a composite film of the above-mentioned film and other materials can be used. As such a material, a porous film, a perforated film, a non-woven fabric, a polymer network film, or the like can be used, and these are, for example, GORE-TEX (trademark).
(Manufactured by Gore-Tex Japan), Tyvek (trademark)
(Made by DuPont Japan), Telnet (Appliea Es
trusion technologies Inc.) and other trade names. Such a composite membrane is effective when a membrane having high moisture permeability but insufficient strength is used.

The moisture-permeable film can be produced by a conventional method, for example, an extrusion film-forming method using a T-die, an inflation method, casting on a release paper, direct coating on a substrate, and the like. Techniques such as polymer blending, polymer alloying, graft polymerization, block polymerization, and interpenetrating polymer networks (IPN) can also be used to improve the properties of the membrane material polymer. Also,
Partial cross-linking, chemical or physical surface modification such as antifouling treatment, water repellent treatment, hydrophilic treatment, corona discharge treatment, vapor deposition,
Surface roughening can also be performed.

Other functions can be added by kneading many kinds of powders of inorganic, organic, metal, etc. into this film. For example, carbon powder or ceramic powder can be used to improve the heat radiation characteristics from the film surface. Low emissivity metal powders such as gold, silver and aluminum powders impart low emissivity and heat reflectivity. Pigments can be used for coloring. An antibacterial material, a copper powder, or a zeolite powder into which copper or silver is introduced imparts antibacterial properties. Deodorants, fillers, fungicides, fragrances, etc. can also be used. The hydrophilic gel powder also serves as a support for improving the moisture permeability and for sustained release of the drug. As long as a film can be formed and melt adhesion is retained, the mixing amount of these is not particularly limited, but usually 50% or less (weight fraction) of an organic compound,
For heavy metals having a high specific gravity, 75% or less can be adopted. The diameter of the powder must be smaller than the film thickness in that diameter. That is, it is 50 microns or less, preferably in the range of submicron to several microns. The membrane can also be swollen with chemicals such as fragrances, chemicals and insect repellents.

As the heat insulating fiber material, most fiber materials made of thermoplastic resin can be used in the present invention.
For example, polyester, polyamide, polyolefin, polyurethane, etc. are typical. Preferably, card non-woven cotton made of staple fibers, melt blown non-woven fabric mixed with staple fibers known as Thinsulate (trademark) heat insulating material, and the like can be used. Such staple fibers are usually crimped and their size is approximately 0.5 to 100 denier. Usually, a diameter of 1 to 6 denier is often used, but recently, a fiber of ½ to 3/4 denier is being developed because of its soft texture.

Some other amount of natural fibers, such as wool, silk, pulp, etc., metal fibers, inorganic fibers, carbon fibers, etc., may be mixed with the above-mentioned thermoplastic fiber materials to such an extent that the melt adhesion of cotton is retained. it can. However, pure natural fibers, metal fibers, inorganic fibers, carbon fibers, etc. are not suitable for this invention. This is because they cannot melt bond with the permeable membrane.

The density of the heat insulating fiber material is usually 2 kg / m ³ to 300 kg / m ³ . Relatively light 2kg / m ³ to 3
A fiber material of 0 kg / m ³ is preferable as a heat insulating material for clothing,
A high-density fiber material of 30 kg / m ³ to 300 kg / m ³ is convenient as a compression-resistant fiber material for cold weather shoes and the like. The heat insulating property of the fiber material is relatively light, for example, 0.1-1.0 claw may be used when it is used as a town wear or a sports jacket, but under severe conditions, that is, ski wear and winter mountain climbing. , 1.0 for polar expeditions
-5.0 Claw required. Since these heat insulating fiber materials usually have a heat insulating rate of 0.3-2.3 claws / cm per unit thickness, the thickness of the heat insulating fiber material is determined by its use and heat insulating rate. Here, it was measured by a claw calorimeter, a claw meter (manufactured by 3M).

When the heat-insulating composite material does not have sufficient strength only with the heat-insulating fiber material and the two moisture-permeable membranes constituting the heat-insulating composite material, an additional reinforcing sheet material is added in the laminating step or the welding step. It may be further laminated. The location may be in the center of the fibrous material, on both sides, or on one side, or on both sides, on one side, on the outside of the moisture permeable membrane, and combinations thereof. This structure is schematically shown in FIG. As the material of this reinforcing material, spunbonded non-woven fabric, polymer net, perforated film, knitted fabric, thread or the like is used.

In the present invention, a large number of independent spaces are formed by fusing the moisture permeable membrane, the heat insulating fiber material and the reinforcing agent, if present, together. In this case, the above-mentioned materials may be directly fused or may be fused after being bonded with an adhesive. The latter method is adopted when forming a relatively large independent space (rough shape) or when durability is required. In this case, for example, a moisture-curable polyurethane adhesive is used, and it is preferable to apply the adhesive in spots so as not to impair the moisture permeability of the moisture-permeable film. This can be easily done with a gravure roll coater or the like.

The fusion can be performed by ultrasonic fusion or thermal fusion. Ultrasonic fusion can be performed by, for example, a pinlinic machine (manufactured by Nikko Techno Co., Ltd.). The heat fusion is performed under heat and pressure using, for example, two heated embossing rolls, an embossing roll consisting of a rubber roll and a heated roll, or an engraved hot plate.
Appropriate conditions are determined depending on the type of moisture permeable membrane, the type of heat insulating fiber material, etc., but are generally performed at a temperature of 75 ° C to 200 ° C.

[0023]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples.
explain.Example 1. (Example) Commercially available thermoplastics for coatings
A retan solution was used. This is an isocyanate component
MDI, PTMG and polyol as polyol components
Made of ren glycol. The solution is rare with MEK
Then, 10% by weight of aluminum powder was mixed. this
It was coated on a release paper and dried in an oven at 80 ° C. Mold release
The film obtained on the paper had a thickness of 10 μm. Next
The membrane is made of polyester staple fiber.
76 g / m2 per square meter ²Card non-woven cotton
And moisture-crosslinkable polyurethane adhesive on both sides of the fiber material.
The adhesive was applied in spots and bonded. Then release paper
Remove and cure at room temperature for 48 hours as shown in Figure 4- (1).
A laminated composite sheet having a structure was obtained. The paste is silver
Opaque in color and very soft in texture
It was Next, the bonded product is 5 mm wide for buoyancy test.
Heat sealer in a 10x10 cm square room with a line
-I divided it.

For other tests, a 45 cm × 45 cm sample was used. The air in the fibrous material was trapped in a separate room, resulting in a fluffy insulating material with a moisture permeable membrane attached. 0.00 of the paste
The fiber material density obtained by dividing the fiber material weight by the thickness under a pressure of 2 psi (pounds per square inch) 1
1.52 kg / m ³ is common as a heat insulating fiber material.

Its breathability resistance is 1,800 seconds / 100cc
That was all. Water vapor transmission rate is 1,789 g / m ² ·
It was 24 hours. The water vapor permeability of this moisture permeable membrane is 3,
Since it was 690 g / m ² · 24 hr, this bonded product having a moisture permeable film bonded to both sides had a water vapor permeability of about half. The buoyancy was 7.53 kg / m ² . This is N in Table 2
o. This corresponds to a buoyancy per cubic meter of the fiber material of 965 kg / m ³ as shown in the first line. The durability test of dry cleaning was evaluated by conducting actual commercial dry cleaning five times with a petroleum solvent. The thickness retention, claw value, claw / mm, appearance and shrinkage were very good.

Example 2. EXAMPLE Two sheets of Thinsulate ™ KS-type insulating fiber material, a relatively dense cotton, embossed with a hexagonal mold, after removing the scrim of one fiber material,
They were attached to each other on the scrim side. The three-layer fiber material having a reinforcing material in the center thus obtained was further laminated with a moisture-permeable polyurethane film having a thickness of 10 μm on both sides thereof using a polyurethane adhesive. This polyurethane film is the same as that of Experiment-1 except that it does not contain aluminum powder. The laminating and heat sealing steps were performed in the same manner as in Experiment-1. The obtained five-layer laminated composite [Fig. 4- (2)] was a soft and thin heat insulating sheet having transparent films on both sides thereof.

The characteristics were good as shown in Tables 2 and 3. This laminate has a buoyancy of 2.45 kg / m ² , which is smaller than that of Example 1, but the thickness of this laminate is as thin as 2.9 mm under a pressure of 0.0002 psi. This is because. The numerical value of the buoyant 845 kg / m ³ per 1 m ³ of heat-insulating material indicates that this cotton is an excellent buoyant material. The water vapor permeability was 2,855 gr / m ² · 24 hr (the moisture permeable membrane itself was 5,800 g / m ² · 24 hr). Since this moisture-permeable film contains no aluminum powder, it shows better permeability than that of Example 1.

Example 3. (Example) Thinsulate (registered trademark) CDS having a weight per unit area of 40 g / m ² and reinforcing material made of spunbonded nonwoven fabric on both sides thereof is ultrasonically welded in a small square shape.
A 30-μm thick Syntec moisture permeable membrane was attached to both sides of a − type heat insulating material. Other steps were the same as in Example 1. The obtained five-layer laminated product [Fig. 4- (3)] was plump and had a glossy surface. And the characteristics were very good. The Syntec moisture permeable membrane is a porous polyolefin membrane with a highly moisture permeable polyurethane resin impregnated in its voids. Therefore, in spite of the film having a thickness of 30 μm, this bonded product has a value of 2,885 g / m ²
Showed good water vapor permeability.

Example 4. EXAMPLE A membrane similar to that of Example 1 was laminated to both sides of a Thinsulate (TM) Y-type insulation material mixed with ceramic kneaded resin fibers for absorption of heat radiation. The other steps were the same as in Example 1. A soft and plaque soft laminate having a silver surface [Fig. 4- (4)] was obtained. And it showed good properties.

Example 5. (Example) The moisture permeable membrane described in Example 1 was attached to one side of a reinforcing material composed of a spunbonded nonwoven fabric using a polyurethane adhesive. Then, it was applied to both sides of a Thinsulate (trademark) Y-type heat insulating material having a basis weight of 300 g / m ² and thermocompression-bonded with an embossing roll of the Thinsulate (trademark) heat insulating material logo. The obtained bonded product [Fig. 4- (5)] showed good properties.

[0031]Example 6. (Example) 42.2 kg / m²100% meltblown with a density of
-Fiber material made by inflation process 2
Polyurethane film with a thickness of 0 μm (Nippon Polyurethane Industry
It is a product name of Silk Ron) and is covered on both sides with
In addition, both sides of the sponge bonded nonwoven fabric are reinforced
Covered. Next, the five-layer laminate is bonded by ultrasonic welding.
Embodied. The obtained bonded composite is a material with a sense of mass.
Yes, it showed excellent characteristics. However, its water vapor permeability
Transparency is relatively low, 789 g / m ²・ It was 24 hours.
This is because the water vapor permeability of this membrane itself is 1,400 g.
/ M²・ Because it is as low as 24 hours. The advantage of this membrane is simple
It is possible to make it at low cost by various processes. If like this membrane
A lower water vapor permeable membrane is used as the inner membrane
Then the outer membrane will pass water vapor more quickly,
This keeps the humidity low and prevents condensation on the outer membrane.
You can

Example 7. (Comparative Example) As shown in FIG. 4- (7), a 12 μm thick porous polyethylene membrane having a 60% open area was used to cover both sides of a Thinsulate (trademark) C-type heat insulating material. Heat sealed. This laminated product had no breathability resistance. And the air could not be trapped in the room created by the heat-sealing process. Water vapor permeability and buoyancy were obtained, but dry cleaning resistance was not obtained.

[0033]Example 8. (Example) From heat crimping staple fiber of polyester
Made, 38g / m ²Stretchable thermal insulation with unit weight
The fibrous material is coated on one side with the membrane described in Example 1 already.
0.75 denier pasted with urethane adhesive
Made from staple fiber of 22g /
m²I covered both sides with this card cotton. And same as above
It was heat-sealed in the same manner. Very soft, bulky and stretched
A crimped and more prudent laminated composite [Fig. 4-
(8)] was obtained. Its properties were very good.

Example 9. (Example) A non-woven fabric having a basis weight of 24 g / m ² produced by the hydroentangling method,
Sontara (trademark) (manufactured by DuPont) was covered with a reinforcing material of spunbonded non-woven fabric, and both surfaces were similarly laminated with the film described in Example 1. Thin and strong laminating compound [Fig. 4-
(9)] was obtained. Then, as shown in Tables 2 and 3, very good characteristics were exhibited.

Example 10. (Comparative Example) As shown in FIG. 4- (10), rayon cotton, which was needle punched after being carded, was covered with a Tyvek (trademark) non-woven fabric sheet (manufactured by Dubon) having a basis weight of 55 g / m ² , and similarly. Heat sealed. This laminated product did not show breathability resistance. Also, air could not be trapped in the room created by the heat-sealing process. In the buoyancy test, the cotton of this laminate got wet. This is because water has passed through Tyvek (trademark).

The structures of the heat insulating materials obtained in Examples 1 to 10 are shown in FIG. 4 and Table 1, and their characteristics are shown in Tables 2 and 3.
Shown in.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

[Table 3]

The buoyancy was measured as follows. A beaker containing water is placed on the scale, and a downward hemispherical net attached to the tip of a bar is immersed in water in the beaker to set the scale of the scale to zero. A 10 cm × 20 cm sample is rolled up and placed in the hemispherical net and submerged at a depth of about 10 cm from the water surface. Read the buoyancy (W) directly from the scale scale.

The buoyancy per sample m ^{2 is obtained} by the buoyancy = W / 0.02 (g / m ² ). Example 11. (Example) The bonded article of Example 1 before heat-sealing was molded into a mold shown in FIG. 5-A (circle having a diameter of 3 mm, 4 mm pitch, 51% non-embossing rate).
Hot embossed by a press machine at 160 ° C.
The obtained bonded product was finely fractionated and was plump.

Example 12. (Example) The bonded product of Example 2 before heat sealing was heat embossed at 140 ° C with an embossing roll having a hexagonal pattern (a hexagonal pattern having a side of 2 mm and an embossed line width of 0.4 mm) shown in Fig. 5-B. The obtained bonded product was soft and plump. Example 13. (Example) The bonded product of Example 3 before heat-sealing was subjected to an ultrasonic welding machine to obtain a structure shown in FIG.
-C shape (checkerboard pattern, 1/2 inch pitch, 1/1
6 inch line width). The obtained bonded product was strongly sealed, and the strength of the film gave it a puffiness with good pressure resistance.

Example 14. (Example) The 1 / 16-inch square dots were further mixed with the bonded product of Example 13 by an ultrasonic welding machine as shown in Fig. 5-D7.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat insulating material of the present invention.

FIG. 2 is a sectional view of one independent space of the heat insulating material of the present invention.

FIG. 3 shows various planar shapes of multiple independent spaces of the insulating material of the present invention.

FIG. 4 is a cross-sectional view of one independent space of the heat insulating material produced in Examples 1-10.

FIG. 5 shows the planar shapes of a large number of independent spaces of the heat insulating material of the present invention produced in Examples 11-14.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating cotton 2, 3 ... Moisture permeable film 4 ... Fusion part 5, 6 ... Independent space 7, 8, 9, 10, 11 ... Reinforcing material

Claims (5)

[Claims] 1. A fusible heat-insulating fibrous material made mainly of a thermoplastic material, and at least two fusible fusible materials comprising a thermoplastic material disposed on both sides of the fusible heat-insulating fibrous material. A sheet of moisture permeable membrane, the at least 2
A heat insulating composite material having a large number of air-filled independent spaces formed by fusing a sheet of moisture permeable film and a heat insulating and heat insulating fiber material. 2. The fusible heat insulating fiber material is 0.1-5.
The heat insulating composite material according to claim 1, having a heat insulating property of 0 claw. 3. The fusible heat insulating fiber material is a fusible heat insulating fiber material selected from a thermoplastic resin selected from the group consisting of polyester, polyamide, polyolefin and polyurethane. The heat insulating composite material according to. 4. The permeable membrane is TAPPI F 460.
18 when measured by the method or JIS P8117 method
It has a breathability resistance of 00 seconds / 6.45 cm ² · 100 ml or more, and when measured by JIS Z 0280 B method, it is 500 g / m ² · 24 hr or more (40 ° C, relative humidity 90
%) The heat insulating composite material according to claim 1, having a water vapor permeability of (%). 5. The moisture-permeable film is thermoplastic polyurethane,
A membrane comprising natural rubber, ethylene-maleic anhydride (EMA), ethylene-methacrylic acid copolymer (EMMA), polyvinyl alcohol (PVA), polyolefin, polytetrafluoroethylene (PTFE), or a combination thereof. The heat insulating composite material as described in 1 or 4.