JP2019132319A - Laminate for vacuum heat insulation material, and vacuum heat insulation material using the same - Google Patents

Abstract

To provide a laminate for vacuum heat insulation material capable of preventing heat insulation effect from deteriorating even in long-term use under high-temperature environment, and a vacuum heat insulation material using the laminate.SOLUTION: Provided are a laminate for vacuum heat insulation material and a vacuum heat insulation material using the laminate characterized in that the laminate for vacuum heat insulation material has at least a gas barrier layer and a heat fusion layer; the heat fusion layer contains cyclic polyolefin resin; and the amount of a volatile component of the laminate for vacuum heat insulation material is 100 ng/g or less under the following measurement conditions. (Measurement Conditions) After a 100 mm×100 mm laminate is put in a vacuum container with a capacity of about 1 L, brought into a vacuum state, and heated at 90°C for 60 minutes, the amount of the volatile component generated in the vacuum container is measured by gas chromatography.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate for a vacuum heat insulating material and a vacuum heat insulating material using the same.

  In recent years, reduction of greenhouse gases has been promoted due to global warming, and energy saving is demanded for electrical products, vehicles, equipment and buildings.

  Among them, from the viewpoint of reducing power consumption, the use of vacuum heat insulating materials for articles such as electric products, vehicles, and buildings is being promoted. By providing these articles with a vacuum heat insulating material, it becomes possible to improve the heat insulation performance of the whole article, and an energy reduction effect is expected.

  The vacuum heat insulating material is a heat insulating material whose heat insulating performance is improved by wrapping the core material in a laminate, making the periphery of the core material in a vacuum state, and bringing the thermal conductivity of the gas as close to zero as possible.

  In general, vacuum insulation is made by fusing the peripheral edges of two facing exterior materials (laminates) with heat to form a bag, and a core material such as foamed resin or fiber material is placed in it to deaerate. The inside of the bag is formed in a vacuum state, and the opening of the bag body is sealed and sealed.

  Since the inside of the vacuum heat insulating material is in a high vacuum state, heat transfer due to air convection inside is blocked, so that high heat insulating performance can be exhibited.

  In order to maintain the heat insulating performance of the vacuum heat insulating material for a long period of time, it is necessary to maintain the internal vacuum state. Therefore, the exterior material used for the vacuum heat insulating material is required to have various functions such as a gas barrier property for preventing gas from permeating from the outside and a thermal adhesive property for covering and sealing the core material. As the exterior material, usually, a laminate of a plurality of functional layers having these functions is used.

  For example, Patent Documents 1 to 3 disclose an exterior material in which a heat fusion layer, a single-layer or multilayer gas barrier layer, and a single-layer or multilayer protective layer are laminated in this order from the core material side of the vacuum heat insulating material. Has been.

  Moreover, these functional layers which comprise the laminated body which is an exterior material are normally laminated | stacked through an interlayer contact bonding layer.

JP 2010-255938 A JP 2011-89740 A JP 2006-194297 A

  However, when the vacuum heat insulating material is used in a high temperature environment of 100 ° C. or higher for a long period of time, the heat resistance of the laminate as the exterior material is low, and the vacuum state inside the vacuum heat insulating material can be maintained due to the deterioration of the laminate. As a result, there is a problem that the heat insulation performance cannot be exhibited for a long time.

Among them, among the functional layers constituting the laminate, the heat-sealing layer is more likely to deteriorate due to long-term exposure at a higher temperature than the other functional layers, and some constituent materials generate gas by thermal decomposition. The gas generated from the heat-sealing layer stays inside the vacuum heat insulating material and causes a decrease in the degree of vacuum inside. As a result, the heat conductivity as the vacuum heat insulating material is improved and the heat insulating effect is improved. It was causing a decline.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is a vacuum heat insulation in which a heat insulating core material is covered with a laminate for a vacuum heat insulating material, and the inside is deaerated to be in a vacuum state. A laminate for a vacuum heat insulating material used for a material, wherein the laminate for a vacuum heat insulating material has at least a gas barrier layer and a heat fusion layer, and the heat fusion layer contains a cyclic polyolefin resin, The vacuum heat insulating material laminate is characterized in that the volatile component amount of the vacuum heat insulating material laminate is 100 ng / g or less under the following measurement conditions.

(Measurement condition)
A laminated body of 100 mm × 100 mm is put in a vacuum container having a capacity of about 1 L, heated to 90 ° C. for 60 minutes, and then the amount of volatile components generated in the vacuum container is measured by gas chromatography.

  The invention according to claim 2 is characterized in that a protective layer is disposed on the surface of the gas barrier layer opposite to the surface on which the heat-fusible layer is located via an adhesive layer. Item 2. The laminate for a vacuum heat insulating material according to Item 1.

  The invention according to claim 3 is characterized in that, in the vacuum heat insulating material using the laminated body for vacuum heat insulating material, the laminated body for vacuum heat insulating material according to either claim 1 or claim 2 is used. It is a vacuum insulation material.

  In the laminated body for vacuum heat insulating materials of this invention, heat resistance can be improved with the composition of a layer, and there exists an effect that long-term use in a high temperature environment is possible.

  That is, according to the first aspect of the present invention, a high degree of vacuum is maintained even when the vacuum heat insulating material using the laminate for a vacuum heat insulating material of the present invention is exposed in a high temperature environment for a long time. This makes it possible to maintain a low thermal conductivity.

  Further, according to the invention described in claim 2, functional layers such as a gas barrier layer and a heat fusion layer can be protected by the protective layer.

  Furthermore, according to invention of Claim 3, it has the laminated body arrange | positioned facing so that the core material and the said core material may be covered, and the vacuum heat insulating material by which the periphery of the said exterior material facing was sealed And at least one of the said laminated body which opposes provides the vacuum heat insulating material which has at least a gas barrier layer and a heat-fusion layer, and it is laminated even if a vacuum heat insulating material is exposed under high temperature for a long period of time. Since the deterioration of the body is suppressed, the overall heat resistance of the vacuum heat insulating material can be improved.

It is a cross-sectional schematic diagram for demonstrating one Embodiment of the vacuum heat insulating material which concerns on this invention. It is a cross-sectional schematic diagram for demonstrating one Embodiment of the laminated body for vacuum heat insulating materials which concerns on this invention.

Hereinafter, a detailed description will be given of embodiments for carrying out the present invention with reference to the drawings.
However, the present invention is not limited to these examples.

  It should be noted that the same reference numerals are given to the constituent elements that exhibit the same or similar functions throughout the drawings, and redundant descriptions are omitted.

  FIG. 1 is a schematic cross-sectional view for explaining an embodiment of a vacuum heat insulating material according to the present invention. A core material (3) is coat | covered and enclosed with the laminated body (2) for vacuum heat insulating materials, and comprises a vacuum heat insulating material (1).

  At this time, the inside is deaerated and is in a vacuum state. Moreover, the laminated body (2) for vacuum heat insulating materials is used by thermally fusing the heat fusion layers so as to face each other.

  FIG. 2 is a schematic cross-sectional view for explaining one embodiment of a laminate for a vacuum heat insulating material according to the present invention.

  In the example of the embodiment for carrying out the invention shown here, as the gas barrier layer (21), the gas barrier layer A (21A) and the gas barrier layer B (21B) are laminated via the adhesive (24). An example of a two-layer configuration is shown.

  The heat barrier layer (22) is provided on one surface of the gas barrier layer (21) via an adhesive (24), and the other surface is protected via an adhesive (24). A layer (23) is provided.

  The laminate for a vacuum heat insulating material is required to have a gas barrier property in order to maintain an internal vacuum state. Therefore, a gas barrier layer is provided in a layer constituting the laminate for a vacuum heat insulating material to provide gas barrier properties. As the gas barrier layer, a metal foil such as aluminum can be used, and a gas barrier layer is provided on the surface. The provided gas barrier film can also be used.

  The gas barrier film is formed, for example, by using a film made of a plastic material and providing a vapor-deposited thin film on one side thereof. Alternatively, a film obtained by sequentially laminating a vapor-deposited thin film layer and a coating layer may be used.

  Examples of plastic materials include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin films such as polyethylene and polypropylene, polystyrene films, polyamide films, polycarbonate films, polyacrylonitrile films, polyimide films, and ethylene-vinyl. An alcohol copolymer (EVOH) film, a polyvinyl alcohol film, or the like can be used.

  These may be stretched or unstretched as long as they have mechanical strength and dimensional stability.

  Usually, these are processed into a film and used. In particular, a polyethylene terephthalate film or a polyamide film arbitrarily stretched in the biaxial direction from the viewpoint of heat resistance or the like is preferably used.

  Further, various well-known additives and stabilizers such as an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant may be used on the surface of the film opposite to the surface on which the deposited thin film layer is provided.

In addition, in order to improve the adhesion to the deposited thin film layer, the substrate side is subjected to any treatment such as corona treatment, low temperature plasma treatment, ion bombardment treatment, chemical treatment, solvent treatment as a pretreatment. Also good.

  The thickness of the film is not particularly limited, and in consideration of suitability as a film, a film in which films having different properties other than a single film are laminated can also be used. In consideration of workability, the range of 3 to 200 μm is preferable, and 6 to 30 μm is particularly preferable.

  In consideration of mass productivity, it is desirable to use a long continuous film capable of continuously forming each layer.

  Next, the deposited thin film layer is made of a deposited film of a metal such as aluminum, copper, silver, or an inorganic oxide such as yttrium tantalum oxide, aluminum oxide, silicon oxide, magnesium oxide, or a mixture thereof, such as oxygen, water vapor, etc. It has a gas barrier property.

  Among these, aluminum, aluminum oxide, silicon oxide, and magnesium oxide are particularly preferable.

  Note that the material is not limited to the above-described metals and inorganic oxides, and any material having gas barrier properties such as oxygen and water vapor can be used.

  The optimum thickness of the vapor-deposited thin film layer varies depending on the type and configuration of the compound used, but is preferably in the range of 5 to 300 nm, and the thickness can be appropriately selected. This is because when the film thickness is less than 5 nm, a uniform film cannot be obtained and a sufficient function cannot be exhibited. In the case of an inorganic oxide, when the film thickness exceeds 300 nm, This is because the thin film may be cracked due to external factors such as bending and pulling after film formation. More preferably, it can be in the range of 10 to 150 nm.

  As a method of forming the deposited thin film layer on the film, it can be formed by a normal vacuum deposition method. Further, as other thin film forming methods, a sputtering method, an ion plating method, a plasma vapor deposition method (PCVD), or the like can be used. Considering productivity, it can be said that the vacuum deposition method is the best at present.

  As a heating means of the vacuum deposition method, any of an electron beam heating method, a resistance heating method, and an induction heating method is preferable.

  Moreover, in order to improve the adhesiveness of a vapor deposition thin film layer and a base material, and the denseness of a vapor deposition thin film layer, it is also possible to vapor-deposit using a plasma assist method or an ion beam assist method.

  Moreover, in order to improve the transparency of a vapor deposition thin film layer, you may perform the reactive vapor deposition which blows in oxygen gas etc. in the case of vapor deposition.

  Furthermore, in order to form a gas barrier layer, a film layer by coating may be provided on the deposited thin film layer.

In the case of forming a coating layer by coating, for example, at least one of water-soluble polymer, (a) one or more alkoxides or hydrolysates thereof, or (b) tin chloride is added. It can be formed using an aqueous solution containing water or a coating agent mainly composed of a water / alcohol mixed solution.

  For example, a solution in which a water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which a metal alkoxide is treated directly or hydrolyzed beforehand is mixed. A coating agent is prepared by adjusting, and this coating agent is coated on a vapor-deposited thin film layer made of an inorganic oxide and then heated and dried.

  Examples of the water-soluble polymer used in the coating agent include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate.

  In particular, when polyvinyl alcohol (PVA) is used, the gas barrier property is most excellent. This PVA is generally obtained by saponifying polyvinyl acetate, and it ranges from so-called partially saponified PVA in which several tens percent of acetic acid groups remain to complete PVA in which only several percent of acetic acid groups remain. Including, but not limited to.

The tin chloride used for the coating agent may be stannous chloride (SnCl ₂ ), stannic chloride (SnCl ₄ ), or a mixture thereof.

Furthermore, the metal alkoxide used for the coating agent is a compound represented by a general formula, M (OR) _n (M: metal such as Si, Ti, Al, Zr, R: alkyl group such as CH ₃ , C ₂ H ₅ ). It is.

Specific examples include tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ], triisopropoxyaluminum [Al (O-2′-C ₃ H ₇ ) ₃ ] and the like. Propoxyaluminum is preferable because it is relatively stable in an aqueous solvent after hydrolysis.

  As long as the gas barrier property of the coating agent is not impaired, known additives such as isocyanate compounds, silane coupling agents, dispersants, stabilizers, viscosity modifiers, and colorants can be added as necessary.

  For example, the isocyanate compound added to the coating agent is preferably one having two or more isocyanate groups in the molecule. For example, monomers such as tolylene diisocyanate, triphenylmethane triisocyanate, tetramethylxylene diisocyanate, and polymers and derivatives thereof can be mentioned.

  As a method for applying the coating agent, conventionally known means such as a dipping method, a roll coating method, a screen printing method, a spray method, and a gravure printing method which are usually used can be used.

  The thickness of the coating layer varies depending on the type of coating agent, processing machine, and processing conditions. When the thickness after drying is less than 0.01 μm, a uniform coating film may not be obtained and sufficient gas barrier properties may not be obtained. Further, when the thickness exceeds 50 μm, there is a problem because cracks are likely to be generated in the film.

  Therefore, it can be preferably in the range of 0.01 to 50 μm, more preferably in the range of 0.1 to 10 μm.

In addition, it is also possible to provide a vapor deposition thin film layer and a coating layer similarly on a vapor deposition thin film layer and a coating layer, and can laminate | stack and provide a multiple layer as needed.

  As a method of laminating each layer of the laminate for a vacuum heat insulating material using the adhesive (24), conventionally known adhesives and laminating methods can be used. For example, a two-component curable urethane adhesive is used. A dry lamination method or an extrusion lamination method can be used, but is not particularly specified.

  As a structural example of the gas barrier layer (21) as shown in FIG. 2, for example, a transparent vapor-deposited polyethylene terephthalate film provided with an inorganic oxide as a vapor-deposited thin film is used as the gas barrier layer A (21A), and a dry adhesive which is an adhesive (24). The structure etc. which laminate | stack an aluminum vapor deposition ethylene-vinyl alcohol copolymer film as gas barrier layer B (21B) through a laminate layer, and make it a gas barrier layer (21) can be mentioned.

  As a material of the heat-fusible layer (22), a cyclic polyolefin-based resin is included. A heat-fusion layer (22) is a layer which bears the outermost layer in one side of the lamination direction of the laminated body for vacuum heat insulating materials of this invention normally.

  Cyclic polyolefin resin is a low water-absorbing and amorphous hydrocarbon polymer with an alicyclic structure. It has higher heat stability than ordinary polyolefin resins and is used for a long time at high temperatures. It can be said that the material is suitable for the application.

  The thickness of the heat-fusible layer (22) may be any thickness as long as it can have a desired adhesive force. For example, the thickness is in the range of 20 μm to 100 μm, in particular in the range of 25 μm to 90 μm, particularly 30 μm to 80 μm. Within the range of is preferable.

  If the thickness of the heat-fusible layer (22) is larger than the above range, the gas barrier property and appearance as the whole laminate for vacuum heat insulating material of the present invention may be deteriorated. In some cases, the desired adhesive strength cannot be obtained, and peeling may occur during long-term use at high temperatures.

  The heat-sealable layer (22) may be a commercially available film or sheet, or may be formed by applying a composition of the heat-sealable layer.

  The protective layer (23) is a layer that becomes an outermost layer when the vacuum heat insulating material (1) is formed. The protective layer (23) has excellent properties in mechanical, physical, chemical, and the like. In addition, it is possible to use a plastic film that has excellent strength, heat resistance, moisture resistance, pinhole resistance, puncture resistance, and the like.

  Examples of such plastics include polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc. It is appropriately selected according to the application.

  Among these, for example, when a polyamide film or the like is used, it can be said that it is more preferable in terms of strength as an outermost layer material covering the vacuum heat insulating material.

  It is important that the laminate (2) for a vacuum heat insulating material obtained as described above has few volatile components generated when held in a high temperature environment, thereby producing the vacuum heat insulating material (1). When this is done, it is possible to prevent a decrease in the degree of vacuum inside the vacuum heat insulating material (1) and maintain a low thermal conductivity.

  Specifically, the laminate for vacuum heat insulating material (2) is cut into a size of 100 mm × 100 mm, put into a vacuum collection bottle, which is a vacuum container having a capacity of about 1 L, and heated at 90 ° C. for 60 minutes. After that, when the amount of volatile components generated in the vacuum collection bottle is measured by a gas chromatography method or the like, the amount of volatile components is desirably 100 ng / g or less, more preferably 50 ng / g or less. More preferably, it is desirably 20 ng / g or less.

  The laminate for vacuum heat insulating material (2) in the present invention is arranged so that the heat-sealing layer (22) is in contact with the core material (3). Moreover, since the laminated body (2) for vacuum heat insulating materials arrange | positioned facing so that a core material (3) may be covered, since both show the outstanding heat resistance, the vacuum heat insulating material (1) of this invention is high temperature. Even if it is exposed for a long time in the environment, it is possible to suppress the occurrence or deterioration of peeling between the end of the vacuum heat insulating material (1) and the layers of the laminate, and the inside of the vacuum heat insulating material (1) of the present invention. Can be maintained in a high vacuum state for a long time.

  In addition, the presence or absence of transparency of the said laminated body for vacuum heat insulating materials (2) is not ask | required.

  The core material (3) in the present invention is covered and encapsulated by the opposing laminate (2) for vacuum heat insulating material.

  As a material of the core material (3), any material can be used as long as it is a material generally used for a core material of a vacuum heat insulating material. Examples thereof include powders such as silica, foams such as urethane polymers, and porous bodies such as fiber states such as glass wool.

  The porous body preferably has a porosity of 50% or more, particularly 90% or more. Thereby, it is because it can be set as the core material (3) with low thermal conductivity when enclosed in the vacuum heat insulating material (1) and decompressed.

  The core material (3) may contain a getter agent for adsorbing a small amount of gas entering from the outside. Examples of the getter agent include general materials used for vacuum heat insulating materials such as silica, alumina, zeolite, activated carbon and the like.

  The thickness of the core material (3) is not particularly limited as long as it can provide a desired heat insulating effect. For example, it is preferably in the range of 1 mm to 30 mm in a state after decompression.

  The degree of vacuum inside the vacuum heat insulating material (1) of the present invention is preferably 5 Pa or less. It is because the convection of the air inside a vacuum heat insulating material (1) can be interrupted | blocked and heat insulation performance can be improved.

The heat conductivity (initial heat conductivity) of the vacuum heat insulating material (1) of the present invention is, for example, 10 mW · m ⁻¹ · K ⁻¹ or less, particularly 5 mW · m ⁻¹ · K ⁻¹ or less in a 25 ° C. environment. In particular, it is preferably 3 mW · m ⁻¹ · K ⁻¹ or less.

  This is because the vacuum heat insulating material (1) is less likely to conduct heat to the outside, so that a high heat insulating effect can be achieved. In addition, the said heat conductivity is the value measured by the heat flow meter method using the heat conductivity measuring apparatus (Eihiro Seiki Co., Ltd. product HC-074) according to JIS-A-1412-3.

  The manufacturing method of the vacuum heat insulating material (1) of the present invention encloses the core material (3) using the above-mentioned laminate (2) for vacuum heat insulating material as at least one exterior material, and deaerates the inside to form a vacuum. The method is not particularly limited as long as it can be sealed in a state, and a known method can be used.

  The vacuum heat insulating material (1) of the present invention is used in any place where heat insulation is required, such as a vacuum heat insulating material for electric appliances, a vacuum heat insulating material for construction, a vacuum heat insulating material for a cold insulation box, and a vacuum heat insulating material for automobiles. be able to.

  Hereinafter, the present invention will be described more specifically based on Example 1 and Comparative Examples 1 and 2, but the present invention is not limited to these examples.

Example 1
The material structure is as follows and will be described with reference to FIG.

  A 25 μm thick polyamide film (product name: Bonile RX, manufactured by Kojin Film & Chemicals Co., Ltd.) is prepared as the protective layer (23), and a transparent vapor-deposited polyethylene having a thickness of 12 μm as the gas barrier layer A (21A). A terephthalate film (manufactured by Toppan Printing Co., Ltd., product name: GL-EDC) was laminated and bonded using a urethane adhesive as an adhesive (24) as a dry laminate layer.

  Next, an aluminum-deposited ethylene-vinyl alcohol copolymer film (product name: VM-XL, manufactured by Kuraray Co., Ltd.) having a thickness of 12 μm is used as a gas barrier layer B (21B) on the outer surface of the transparent vapor-deposited polyethylene terephthalate film. Were used as a dry laminate layer.

  Furthermore, on the outer surface of the aluminum-deposited ethylene-vinyl alcohol copolymer film, a urethane-based adhesive is used as a dry laminate layer, and a 30 μm-thick cyclic polyolefin film (manufactured by Kurashiki Boseki Co., Ltd., product) Name: ME-1) was bonded to obtain a laminate (2) for vacuum heat insulating material.

  Next, using the laminate for vacuum heat insulating material (2) produced as described above, a three-sided bag constituting the vacuum heat insulating material was created (200 mm × 200 mm).

  Glass fiber (190mm x 190mm) is sealed in this three-sided bag, the pressure inside the bag is set to 1.0 Pa with a vacuum packaging device, and then the opening of the packaging bag is heated and fused to a thickness of 5 mm. A vacuum heat insulating material (1) having a length of 200 mm and a width of 200 mm was obtained.

(Comparative Example 1)
For the vacuum heat insulating material in the same manner as in Example 1 except that the heat-fusible layer (22) was replaced with a 30 μm-thick cyclic polyolefin film, and a polypropylene film (product name: SC, manufactured by Mitsui Chemicals, Inc.) was used. A laminate (2) and a vacuum heat insulating material (1) were obtained.

(Comparative Example 2)
The same as in Example 1 except that a linear low-density polyethylene film (product name: FCD-NP, manufactured by Mitsui Chemicals, Inc.) was used in place of the 30 μm-thick cyclic polyolefin film for the heat-fusible layer (22). Thus, a laminate (2) for vacuum heat insulating material and a vacuum heat insulating material (1) were obtained.

(Evaluation)
<Analysis of volatile components>
Each sample of the laminate for vacuum heat insulating material (2) 100 mm × 100 mm was put in a vacuum collection bottle of about 1 liter to obtain a vacuum. The vacuum collection bottle was heated in an oven at 90 ° C. for 60 minutes and then taken out and allowed to stand at room temperature.

  Thereafter, the vacuum was released, and volatile components generated in the vacuum bottle were collected using an air sampler, and analyzed by gas chromatography mass spectrometry (GC / MS).

<Measurement of thermal conductivity>
Measurement was performed according to JIS-A-1412-3.

  The vacuum heat insulating material was held at a temperature of 90 ° C. for 8 weeks, and the thermal conductivity was measured using a thermal conductivity measuring device (HC-074 manufactured by Eihiro Seiki Co., Ltd.).

(Evaluation results)
The evaluation results of Example 1 and Comparative Examples 1 and 2 are shown in Table 1.

  From Table 1, it was found that Example 1 had less volatile components than Comparative Examples 1 and 2. That is, it has been found that the cyclic polyolefin film has higher stability under a high temperature environment than the polypropylene film and the linear low density polyethylene, and can suppress the generation of volatile components.

  As a result, it can be considered that Example 1 has lower thermal conductivity after storage at 90 ° C. than Comparative Examples 1 and 2, and heat insulation performance is maintained.

  As described above, by using the laminate for a vacuum heat insulating material of the present invention and the vacuum heat insulating material using the same, a vacuum capable of maintaining low thermal conductivity even when held for a long time in a high temperature environment. Thermal insulation can be provided.

DESCRIPTION OF SYMBOLS 1 ... Vacuum heat insulating material 2 ... Laminated body for vacuum heat insulating materials 3 ... Core material 21 ... Barrier layer 21A ... Barrier layer A
21B ... Barrier layer B
22 ... Heat-fusion layer 23 ... Protective layer 24 ... Adhesive

Claims (3)

A laminate for a vacuum heat insulating material used for a vacuum heat insulating material, in which a heat insulating core material is covered with a laminate for a vacuum heat insulating material, and the inside is deaerated to be in a vacuum state,
The laminate for a vacuum heat insulating material has at least a gas barrier layer and a heat fusion layer,
The heat fusion layer includes a cyclic polyolefin resin,
The laminated body for vacuum heat insulating materials, wherein the amount of volatile components of the laminated body for vacuum heat insulating materials is 100 ng / g or less under the following measurement conditions.
(Measurement condition)
A laminated body of 100 mm × 100 mm is put in a vacuum container having a capacity of about 1 L, heated to 90 ° C. for 60 minutes, and then the amount of volatile components generated in the vacuum container is measured by gas chromatography.   2. The vacuum heat insulating material according to claim 1, wherein a protective layer is disposed on the surface of the gas barrier layer opposite to the surface on which the heat-fusible layer is located via an adhesive layer. Laminated body.   The vacuum heat insulating material using the laminated body for vacuum heat insulating materials WHEREIN: The vacuum heat insulating material formed using the laminated body for vacuum heat insulating materials in any one of Claim 1 or Claim 2.

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