JP7011887B2 - Laminate - Google Patents

Description

The present invention relates to a laminate capable of realizing excellent energy saving.

In recent years, energy issues such as power supply issues have been highlighted, and efforts to address energy conservation issues have become even more important.

For example, efforts for energy saving are increasing in living spaces such as houses and offices, and building materials used for houses and offices are also required to contribute to energy saving.

Conventionally, heat insulating materials are examples of materials that have contributed to energy saving. (For example, Patent Document 1 etc.)

JP-A-2007-56485

However, the heat insulating panel as in the above patent document has a limit in energy saving effect, and recently, a material that can contribute to further energy saving is required.

As a result of diligent studies in order to solve the above problems, the present invention selects a heat storage layer having an optimum temperature range for both sides of the heat storage body by laminating two or more heat storage layers having different phase change temperatures. The present invention has been completed by finding that excellent energy saving can be exhibited for a long period of time by laminating a heat storage material migration prevention layer between heat storage layers. I let you.

That is, the present invention has the following features.
1. 1. A laminated body in which two or more heat storage layers having different phase change temperatures are laminated.
The heat storage layer contains a heat storage material and a metal salt hydrate, and contains a heat storage material and a metal salt hydrate.
The heat storage material is one or more selected from long-chain fatty acid esters having 8 or more carbon atoms and 36 or less carbon atoms .
A laminated body characterized in that a heat storage material migration prevention layer is laminated between the heat storage layers.
2. 2. A laminated body in which two or more heat storage layers having different phase change temperatures are laminated.
The heat storage layer with the highest phase change temperature is stacked in order from the heat storage layer with the lowest phase change temperature.
The heat storage layer contains a heat storage material and a metal salt hydrate, and contains a heat storage material and a metal salt hydrate.
The heat storage material is one or more selected from long-chain fatty acid esters having 8 or more carbon atoms and 36 or less carbon atoms .
A laminated body characterized in that a heat storage material migration prevention layer is laminated between the heat storage layers.
3. 3. The heat storage layer contains a heat storage material, a metal salt hydrate, and a resin, and the heat storage material is immobilized by the resin. Or 2. The laminate described in.

The laminated body of the present invention can realize excellent energy saving.

It is a model diagram of the laminated body structure of this invention. It is a model diagram of the test example of this invention.

1-1: Surface layer 2-1 and 2-2: Heat storage layer 3-1: Heat storage material migration prevention layer 4: Expanded polystyrene foam 5: Infrared lamp 6: Thermocouple

Hereinafter, embodiments for carrying out the present invention will be described in detail.

The present invention is characterized in that two or more heat storage layers having different phase change temperatures are laminated, and a heat storage material migration prevention layer is laminated between the heat storage layers. ..
Such a laminated body can store a wide range of heat, can select a heat storage layer in an optimum temperature range on both sides of the laminated body, can exhibit better energy saving, and can be used between heat storage layers. By laminating a heat storage material migration prevention layer on the surface, excellent energy saving can be maintained for a long period of time.

For example, when the laminate of the present invention is applied to a living space such as a wall, a ceiling, or a floor, the heat storage layer having the lowest phase change temperature is formed on the living space side, and the heat storage layer having the highest phase change temperature is formed on the outside. It is preferable to stack them on the ceiling. When stacking three or more heat storage layers, it is preferable to stack them so that the phase change temperature increases in order from the living space side to the outside. By stacking in this way, the cold heat on the living space side (internal space) can be easily stored in the heat storage layer on the living space side, making it difficult for the cold heat to diffuse to the outside, and the heat storage layer other than the heat storage layer on the living space side can be used outside. It is possible to store heat and suppress the movement to the living space side (internal space), and it is possible to realize excellent cooling efficiency and excellent energy saving.

Specifically, the heat storage layer having the lowest phase change temperature preferably has a phase change temperature of around 15 ° C to 35 ° C. The heat storage layer having the highest phase change temperature preferably has a phase change temperature of 25 ° C to 40 ° C. The difference between the phase change temperature of the lowest heat storage layer and the phase change temperature of the highest heat storage layer is preferably 3 ° C. or higher, more preferably 5 ° C. or higher.
In such a case, the cold heat generated by air conditioning or the like is stored in the heat storage layer on the living space side, and the stored cold heat is difficult to move to the outside, and excellent energy saving can be realized. In addition, the heat of the outside air is repeatedly stored and dissipated in the outer heat storage layer, suppressing the heat of the outside air from moving to the living space, and excellent energy saving can be realized.

When the laminate of the present invention is used as an interior material for a vehicle or the like, the heat storage layer having the lowest phase change temperature preferably has a phase change temperature of around 15 ° C to 35 ° C, and has the highest phase change temperature. For the high heat storage layer, the phase change temperature is preferably 25 ° C to 40 ° C.
When the laminate of the present invention is used as a refrigerator, the heat storage layer having the lowest phase change temperature preferably has a phase change temperature of around 0 ° C. to 15 ° C., and is used as the heat storage layer having the highest phase change temperature. The phase change temperature is preferably 10 ° C to 25 ° C.
When the laminate of the present invention is used as a freezer, the heat storage layer having the lowest phase change temperature preferably has a phase change temperature of around -30 ° C to -10 ° C, and has the highest phase change temperature. The layer preferably has a phase change temperature of −20 ° C. to 0 ° C.

The total thickness of the heat storage layer is preferably 1 mm or more and 10 mm or less (further, 2 mm or more and 7 mm or less). The thickness of each layer may be different or the same, and is preferably 0.5 mm or more and 5 mm or less (further, 1 mm or more and 3.5 mm or less). With such a thickness, sufficient heat storage performance can be obtained and a thin film can be realized.

The heat storage layer of the present invention contains a heat storage material, and examples thereof include a heat storage material immobilized with a resin.

Examples of the heat storage material include an inorganic latent heat storage material and an organic latent heat storage material, and one or more of these heat storage materials can be used. In the present invention, organic latent heat storage materials such as aliphatic hydrocarbons, long-chain alcohols, long-chain fatty acids, long-chain fatty acid esters, fatty acid triglycerides, and polyether compounds can be preferably used. The phase change temperature of the organic latent heat storage material can be easily set according to the application. For example, the phase change temperature can be easily set by mixing two or more kinds of organic latent heat storage materials having different phase change temperatures (melting points). Is possible. The phase change temperature of the heat storage layer of the present invention is determined by the phase change temperature (melting point) of the heat storage material used.

In particular, in the present invention, as the heat storage material, an aliphatic hydrocarbon having 8 or more and 36 or less carbon atoms, a long-chain alcohol having 8 or more and 36 or less carbon atoms, a long-chain fatty acid having 8 or more and 36 or less carbon atoms, and 8 or more and 36 or less carbon atoms. It is preferable to use the long-chain fatty acid ester of.
Examples of the aliphatic hydrocarbons include n-decane (melting point -30 ° C), n-undecane (melting point -25 ° C), n-dodecane (melting point -8 ° C), n-tridecane (melting point -5 ° C), and pentadecane. (Melting point 6 ° C), n-tetradecane (melting point 8 ° C), n-hexadecane (melting point 17 ° C), n-heptadecane (melting point 22 ° C), n-octadecane (melting point 28 ° C), n-nonadecan (melting point 32 ° C) , Eikosan (melting point 36 ° C.), dokosan (melting point 44 ° C.), and n-paraffin or paraffin wax composed of a mixture thereof.
Examples of the long-chain alcohol include capryl alcohol (melting point 7 ° C.), lauryl alcohol (melting point 24 ° C.), myristyl alcohol (melting point 38 ° C.), stearyl alcohol (melting point 58 ° C.), and the like.
Examples of long-chain fatty acids include octanic acid (melting point 17 ° C.), decanoic acid (melting point 32 ° C.), dodecanoic acid (melting point 44 ° C.), tetradecanoic acid (melting point 50 ° C.), hexadecanoic acid (melting point 63 ° C.), and octadecanoic acid. Examples thereof include fatty acids (melting point 70 ° C.) and the like.
Examples of the long-chain fatty acid ester include methyl laurate (melting point 5 ° C.), methyl myristate (melting point 19 ° C.), methyl palmitate (melting point 30 ° C.), methyl stearate (melting point 38 ° C.), and butyl stearate (melting point 38 ° C.). 25 ° C.), methyl arachidic acid (melting point 45 ° C.) and the like.
Further, in the selection of the heat storage material, only one type of heat storage material may be used, or two or more types of heat storage materials having different melting points may be mixed and selected.

The heat storage layer in which the heat storage material is immobilized with a resin can be obtained by mixing the heat storage material and the resin and curing the resin.
Examples of the resin include acrylic resin, silicon resin, polyester resin, alkyd resin, epoxy resin, urethane resin, phenol resin, melamine resin, amino resin, polycarbonate resin, fluororesin, vinyl acetate resin, acrylic / vinyl acetate resin, and acrylic.・ Solvent-soluble type such as urethane resin, acrylic / silicon resin, silicon-modified acrylic resin, ethylene / vinyl acetate / versatic acid vinyl ester resin, ethylene / vinyl acetate resin, vinyl chloride resin, ABS resin, AS resin, synthetic rubber, etc. Examples thereof include NAD type, water-soluble type, water-dispersed type, solvent-free type and the like, and one or more of these can be used.
In the present invention, it is preferable to use a resin that forms a crosslinked structure such as polyol-isocyanate and amine-epoxy, and if such a resin is used, the heat storage material is supported and held in the crosslinked structure and immobilized. A heat storage layer can be obtained.
It should be noted that when the encapsulated heat storage material is fixed with a resin, the heat storage property is deteriorated due to the capsule wall, which is not preferable.

In addition to heat storage materials and resins, clay minerals, surfactants, heat conductive substances, metal salt hydrates, compatibilizers, reaction accelerators, flame retardants, pigments, aggregates, viscosity modifiers, plasticizers, buffers, etc. Dispersants, cross-linking agents, pH adjusters, preservatives, fungicides, antibacterial agents, algae-proofing agents, wetting agents, defoaming agents, foaming agents, leveling agents, pigment dispersants, anti-settling agents, anti-sagging agents, freezing Mixing additives such as inhibitors, lubricants, dehydrating agents, matting agents, UV absorbers, antioxidants, light stabilizers, fibers, fragrances, chemical adsorbents, photocatalysts, moisture-absorbing and desorbing powders and granules. You can also.

In the present invention, it is particularly preferable to include metal salt hydrate. By containing the metal salt hydrate, it is possible to exhibit excellent heat resistance while maintaining excellent heat storage property. In addition, excellent heat conduction efficiency can be imparted.
Examples of the metal salt hydrate include hydrates of metal salts of metal and acid.
Examples of the metal include sodium, potassium, magnesium, calcium, strontium, titanium, zirconium, manganese, iron, cobalt, nickel, copper, zinc, aluminum and the like, and particularly from sodium, potassium, magnesium, calcium and aluminum. One or more selected species are suitable.
Examples of the acid include silicic acid, boric acid, phosphoric acid, hydrochloric acid, hydrogen sulfide acid, sulfuric acid, nitrate, carbonic acid, oxalic acid, benzoic acid, phthalic acid, maleic acid, succinic acid, salicylic acid, citric acid and the like, and particularly silicic acid. , One or more selected from boric acid, phosphoric acid, sulfuric acid and carbonic acid, and further one or more selected from boric acid and phosphoric acid are suitable.
The metal salt hydrate is represented by a metal salt / n hydrate, and n is preferably an integer of 2 or more and 20 or less, further 3 or more and 17 or less, and further 3 or more and 11 or less. Within such a range, excellent heat resistance can be exhibited and heat can be efficiently stored in a short time. If n is less than 2, the heat resistance may be insufficient, and if n is larger than 20, it may be difficult to maintain excellent heat resistance and heat storage for a long period of time.
Specifically, sodium dihydrogen phosphate (dihydrate), magnesium hydrogen phosphate (trihydrate), magnesium dihydrogen phosphate (tetrahydrate), tetrasodium diphosphate (tenhydrate). ), Disodium hydrogen phosphate (12 hydrate), Sodium tetraborate / 10 hydrate, Sodium tetraborate / pentahydrate, Potassium tetraborate / tetrahydrate, Potassium tetraborate / 8 Hydrate, Strontium tetraborate / tetrahydrate, magnesium metaborate / octahydrate, disodium octaborate / tetrahydrate, sodium metasilicate / pentahydrate, potassium sodium carbonate / hexahydrate Manganese oxalate dihydrate, aluminum sulfate 16 hydrate, aluminum sulfate 18 hydrate, potassium aluminum sulfate dodecahydrate, copper sulfate pentahydrate, cobalt sulfate heptahydrate Examples thereof include substances, sodium sulfate, decahydrate and the like, and one or a mixture of two or more of these can be used.
When a metal and an alloy thereof, or a metal compound such as a metal oxide containing these metals, a metal hydroxide, a metal nitride, a metal carbide, or a metal phosphate is used instead of the metal salt hydrate, It is difficult to improve heat resistance.
The particle size of the metal salt hydrate is not particularly limited, but is preferably 30 μm or more and 600 μm or less, and more preferably 50 μm or more and 250 μm or less in terms of exhibiting the effect of the present invention. The particle size is a value obtained by sieving using a metal net sieve specified in JIS Z8801-1: 2000.
In the present invention, when the metal salt hydrate is contained, it is preferable to use a resin containing polyol-isocyanate as the resin because the metal salt hydrate is efficiently and uniformly dispersed.
The mixing amount of the metal salt hydrate and the heat storage material is 10 parts by weight or more and 120 parts by weight or less, preferably 15 parts by weight or more and 90 parts by weight or less, more preferably 20 parts by weight, based on 100 parts by weight of the heat storage material. It is preferably 7 parts by weight or more and 60 parts by weight or less.

The content ratio of the heat storage material in each heat storage layer is preferably 30% by weight or more, more preferably 40% by weight or more, and further preferably 50% by weight or more and 90% by weight or less with respect to the total amount of each heat storage layer.

The heat storage material migration prevention layer used in the present invention prevents the heat storage material from migrating from the heat storage layer to the heat storage layer and maintains the performance of each heat storage layer.
Since the heat storage material changes its state from liquid to solid and solid to liquid before and after the melting point, it easily moves inside the heat storage material and easily shifts from the heat storage layer to the heat storage layer. Therefore, not only the heat storage performance of each heat storage layer is deteriorated, but also the heat storage layer is likely to be deteriorated.
In the present invention, by laminating a heat storage material migration prevention layer between the heat storage layers, it is possible to prevent deterioration of the heat storage performance in each heat storage layer and further prevent deterioration of the heat storage layer, resulting in excellent energy saving. Can last for a period of time.
Examples of the heat storage material migration prevention layer include resin films such as nylon, polyester, polyethylene terephthalate, vinylidene chloride, and ethylene / vinyl acetate copolymers, woven fabrics, non-woven fabrics, and glass cloths. In the present invention, it is particularly preferable to use a resin film, and the resin film alone may be used, a metal vapor-deposited resin film in which a metal is vapor-deposited on the resin film, a laminated resin film in which a glass cloth or a metal foil is laminated on the resin film, or a resin. A metal composite resin film in which metal particles or the like are embedded in the film may be used.
The thickness of the heat storage material migration prevention layer is preferably 0.01 mm or more and 3 mm or less (further, 0.02 mm or more and 2 mm or less).

The laminated body of the present invention is one in which two or more heat storage layers and a heat storage material migration prevention layer are laminated, and the laminating method is not particularly limited.
For example, a method in which each heat storage layer and heat storage material migration prevention layer are manufactured in advance, and the heat storage layer is laminated with an adhesive or the like via the heat storage material migration prevention layer between the heat storage layers to obtain a laminated body.
Alternatively, by laminating a component (heat storage layer precursor) that forms a heat storage layer on one side of the heat storage material migration prevention layer, a heat storage layer formed on the heat storage material migration prevention layer is prepared, and these are laminated. , How to get the laminate,
Alternatively, components (heat storage layer precursors) that form heat storage layers having different phase change temperatures are laminated on both sides of the heat storage material migration prevention layer, and a heat storage layer is formed on the heat storage material migration prevention layer to obtain a laminated body. Method,
And so on.
Further, in the present invention, the heat storage material migration prevention layer may be laminated on both sides of the laminated body.

The laminated body thus obtained can be used as wall materials for buildings such as houses, ceiling materials, interior / exterior materials such as floor materials, partitions, partitions, doors / doors, interior materials such as vehicles, and refrigerators / freezers. , Can be applied as a material for vending machines, bathtubs / bathrooms, refrigerators, cooler boxes, etc.
For example, wood board, slate board, concrete board, gypsum board, ALC board, calcium silicate board, siding board, glass board, metal board, flat plate such as wood wool cement board, metal film, film molded body such as glass fiber, fire protection. Materials, flame-retardant materials, heat insulating materials, waterproof materials, natural fibers such as cotton, linen, wool, and silk, organic fibers such as nylon, tetron, acrylic, polyester, polyurethane, vinylon, rayon, aramid, and azole, and inorganic fibers such as glass. It can be used in combination with fibers and the like.

FIG. 1 shows one of the embodiments for carrying out the laminated body of the present invention.
The surface layer 1-1 shown in FIG. 1 is a calcium silicate plate having a thickness of 6 mm.
The heat storage layer 2-1 shown in FIG. 1 includes 55 parts by weight of a heat storage material (methyl palmitate (melting point 30 ° C.)), 20 parts by weight of a polyether polyol, 0.5 parts by weight of a catalyst (dibutyltin laurate), and sodium tetraborate.・ 15 parts by weight of pentahydrate and 5.5 parts by weight of additives (clay mineral, surfactant) were mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form (containing heat storage material). Ratio: 55% by weight). The thickness of the heat storage layer 2-1 is 2 mm.
The heat storage layer 2-2 shown in FIG. 1 has 55 parts by weight of a heat storage material (methyl stearate (melting point 38 ° C.)), 20 parts by weight of a polyether polyol, 0.5 parts by weight of a catalyst (dibutyltin laurate), and sodium tetraborate.・ 15 parts by weight of pentahydrate and 5.5 parts by weight of additives (clay mineral, surfactant) were mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form (containing heat storage material). Ratio: 55% by weight). The thickness of the heat storage layer 2-2 is 2 mm.
The heat storage material migration prevention layer 3-1 shown in FIG. 2 is an aluminum-deposited resin film having a thickness of 0.07 mm.
FIG. 1A shows the morphology before laminating, and FIG. 1B shows the morphology after laminating.

An experimental example is shown below to clarify the features of the present invention, but the present invention is not limited to this experimental example.

(Experimental Example 1)
As shown in FIG. 2, a framework is assembled using expanded polystyrene foam (thickness 30 mm) so that the inner dimensions are 280 mm in height × 280 mm in width × 280 mm in depth, and the surface layer of the laminate shown in FIG. 1 is on the lower side. The test piece box was prepared. A space of 10 mm was provided between the upper surface of the laminate and the expanded polystyrene foam. Furthermore, a thermocouple was installed to measure the temperature on the surface of the surface layer and the temperature at the center of the test piece box.
In the experiment, an infrared lamp was irradiated from a position 220 mm above the upper surface of the test piece box, and the temperature of the surface layer surface and the temperature (space temperature) of the center of the test piece box were measured.
In addition, only the surface layer was measured as a blank instead of the laminate of the present invention.
As a result, the surface temperature of the surface layer after 1 hour was 4.8 ° C lower than that of the blank. In addition, the space temperature after 1 hour was 1.3 ° C. lower than that of the blank.

(Experimental Example 2)
In FIG. 2, the same test as in Experimental Example 1 except that the following heat storage layer 2-3 is used instead of the heat storage layer 2-1 and the following heat storage layer 2-4 is used instead of the heat storage layer 2-2. Was done.
As a result, the surface temperature of the surface layer after 1 hour was 5.0 ° C. lower than that of the blank. In addition, the space temperature after 1 hour was 1.6 ° C. lower than that of the blank.
Heat storage layer 2-3: Heat storage material (methyl palmitate (melting point 30 ° C.)) 55 parts by weight, polyether polyol 20 parts by weight, catalyst (dibutyltin laurate) 0.5 parts by weight, sodium tetraborate / tetrahydrate 15 parts by weight of an additive (clay mineral, surfactant) was mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form the product (heat storage material content ratio: 55% by weight). ). The thickness of the heat storage layer 2-3 is 2 mm.
Heat storage layer 2-4: 55 parts by weight of heat storage material (methyl stearate (melting point 38 ° C.)), 20 parts by weight of polyether polyol, 0.5 parts by weight of catalyst (dibutyltin laurate), sodium tetraborate / tetrahydrate 15 parts by weight of an additive (clay mineral, surfactant) was mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form the product (heat storage material content ratio: 55% by weight). ). The thickness of the heat storage layer 2-4 is 2 mm.

(Experimental Example 3)
In FIG. 2, the same test as in Experimental Example 1 except that the following heat storage layer 2-5 is used instead of the heat storage layer 2-1 and the following heat storage layer 2-6 is used instead of the heat storage layer 2-2. Was done.
As a result, the surface temperature of the surface layer after 1 hour was 5.2 ° C. lower than that of the blank. In addition, the space temperature after 1 hour was 1.7 ° C. lower than that of the blank.
Heat storage layer 2-5: The same component as the heat storage layer 2-1 with a thickness of 3 mm.
Heat storage layer 2-6: The same component as the heat storage layer 2-2, with a thickness of 3 mm.

(Experimental Example 4)
In FIG. 2, the same test as in Experimental Example 1 except that the following heat storage layer 2-7 is used instead of the heat storage layer 2-1 and the following heat storage layer 2-8 is used instead of the heat storage layer 2-2. Was done.
As a result, the surface temperature of the surface layer after 1 hour was 4.9 ° C. lower than that of the blank. In addition, the space temperature after 1 hour was 1.4 ° C. lower than that of the blank.
Heat storage layer 2-7: The same component as the heat storage layer 2-1 with a thickness of 3 mm.
Heat storage layer 2-8: The same component as the heat storage layer 2-2, with a thickness of 1 mm.

(Experimental Example 5)
In FIG. 2, the same test as in Experimental Example 1 except that the following heat storage layer 2-9 was used instead of the heat storage layer 2-1 and the following heat storage layer 2-10 was used instead of the heat storage layer 2-2. Was done.
As a result, the surface temperature of the surface layer after 1 hour was 5.3 ° C. lower than that of the blank. In addition, the space temperature after 1 hour was 1.7 ° C. lower than that of the blank.
Heat storage layer 2-9: Heat storage material (methyl palmitate (melting point 30 ° C.)) 60 parts by weight, polyether polyol 20 parts by weight, catalyst (dibutyltin laurate) 0.5 parts by weight, sodium tetraborate tenhydrate 10 parts by weight of an additive (clay mineral, surfactant) was mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form the product (heat storage material content ratio: 60% by weight). ). The thickness of the heat storage layer 2-9 is 2 mm.
Heat storage layer 2-10: Heat storage material (methyl stearate (melting point 38 ° C.)) 60 parts by weight, polyether polyol 20 parts by weight, catalyst (dibutyltin laurate) 0.5 parts by weight, sodium tetraborate / tetrahydrate 10 parts by weight of an additive (clay mineral, surfactant) was mixed and stirred, and 4 parts by weight of hexamethylene diisocyanate was added and stirred to form the product (heat storage material content ratio: 60% by weight). ). The thickness of the heat storage layer 2-10 is 2 mm.

(Experimental Example 6)
In FIG. 2, the same test as in Experimental Example 1 was performed except that a polyethylene terephthalate resin film having a thickness of 0.08 mm was used instead of the heat storage material migration prevention layer 3-1.
As a result, the surface temperature of the surface layer after 1 hour was 4.9 ° C. lower than that of the blank. In addition, the space temperature after 1 hour was 1.2 ° C. lower than that of the blank.

Claims (3)

A laminated body in which two or more heat storage layers having different phase change temperatures are laminated.
The heat storage layer contains a heat storage material and a metal salt hydrate, and contains a heat storage material and a metal salt hydrate.
The heat storage material is one or more selected from long-chain fatty acid esters having 8 or more carbon atoms and 36 or less carbon atoms .
A laminated body characterized in that a heat storage material migration prevention layer is laminated between the heat storage layers. A laminated body in which two or more heat storage layers having different phase change temperatures are laminated.
The heat storage layer with the highest phase change temperature is stacked in order from the heat storage layer with the lowest phase change temperature.
The heat storage layer contains a heat storage material and a metal salt hydrate, and contains a heat storage material and a metal salt hydrate.
The heat storage material is one or more selected from long-chain fatty acid esters having 8 or more carbon atoms and 36 or less carbon atoms .
A laminated body characterized in that a heat storage material migration prevention layer is laminated between the heat storage layers. The laminate according to claim 1 or 2, wherein the heat storage layer contains a heat storage material, a metal salt hydrate, and a resin, and the heat storage material is immobilized by the resin.

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