Outer packaging material for vacuum heat insulation material, vacuum heat insulation material and article with vacuum heat insulation material

Abstract

To provide an outer packaging material for a vacuum heat insulation material capable of forming the vacuum heat insulation material enabling suppression of deterioration of heat insulating performance.SOLUTION: An outer packaging material for a vacuum heat insulation material including a polyolefin resin layer is provided.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an outer packaging material for a vacuum insulating material capable of forming a vacuum insulating material, a vacuum insulating material, and an article with a vacuum insulating material.

Background Art

[0002] In recent years, vacuum insulating materials have been used for the purpose of energy saving of articles. A vacuum insulating material is a member in which a core material is disposed in a bag body of an outer packaging material, and the inside of the bag body is maintained in a vacuum state having a pressure lower than the atmospheric pressure, and since internal heat convection is suppressed, good heat insulating performance can be exhibited. Hereinafter, the outer packaging material used for the vacuum insulating material will be described as an outer packaging material for a vacuum insulating material, or simply an outer packaging material.

[0003] In the outer packaging material for a vacuum insulating material, in order to maintain the vacuum state inside the vacuum insulating material for a long period of time, gas barrier properties for suppressing the permeation of gases such as oxygen and water vapor are required. Therefore, generally, a configuration including a gas barrier film is adopted for the outer packaging material for a vacuum insulating material. For example, Patent Document 1 discloses an outer packaging material for a vacuum insulating material including a heat-sealable film and one or more gas barrier films located on the first main surface side of the heat-sealable film and having at least a gas barrier film made of a metal or an inorganic compound.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In conventional outer packaging materials for vacuum insulation materials, a polyethylene terephthalate (PET) film is preferably used as the base material of the gas barrier film. The PET film is inexpensive, has high mechanical strength, and further has high heat resistance. These characteristics lead to high processability in the process of forming a gas barrier layer on the base material, so it is easy to manufacture a gas barrier film having high gas barrier properties. Also, toughness is an advantage even when applied to an outer packaging material for a vacuum insulation material.

[0006] On the other hand, the inventor of the present application newly found that when a gas barrier film having a PET film is applied to an outer packaging material for a vacuum insulation material, the heat conductivity of the vacuum insulation material increases and the heat insulation performance deteriorates.

[0007] The present disclosure is an invention made in view of the above problems, and the main object is to provide an outer packaging material for a vacuum insulation material capable of forming a vacuum insulation material in which a decrease in heat insulation performance is suppressed.

Means for Solving the Problems

[0008] One embodiment of the present disclosure provides an outer packaging material for a vacuum insulation material having a polyolefin resin layer.

[0009] Another embodiment of the present disclosure is a vacuum insulation material having a core material and an outer packaging material enclosing the core material, wherein the outer packaging material is the above-described outer packaging material for a vacuum insulation material.

[0010] Another embodiment of the present disclosure is an article with a vacuum insulation material including an article having a heat insulation region and a vacuum insulation material, wherein the vacuum insulation material has a core material and an outer packaging material enclosing the core material, and the outer packaging material is the above-described outer packaging material for a vacuum insulation material.

Effects of the Invention

[0011] According to the present disclosure, it is possible to provide an outer packaging material for a vacuum insulation material capable of forming a vacuum insulation material in which a decrease in heat insulation performance is suppressed.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

MODE FOR CARRYING OUT THE INVENTION

[0013] The present disclosure includes an outer wrapping material for a vacuum insulating material, a vacuum insulating material, and an article with a vacuum insulating material in embodiments. Hereinafter, embodiments of the present disclosure will be described with reference to the drawings and the like. However, the present disclosure can be implemented in many different modes and is not construed as being limited to the description of the embodiments exemplified below. Also, for the purpose of making the explanation clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the embodiments, but this is merely an example and does not limit the interpretation of the present disclosure. Also, in this specification and each figure, the same elements as those described above with respect to the previously shown figures may be given the same reference numerals, and detailed descriptions may be omitted as appropriate. Also, for convenience of explanation, the terms "upper" or "lower" may be used in the description, but the up and down directions may be reversed.

[0014] In addition, in this specification, when it is stated that a certain component such as a certain member or a certain region is "above (or below)" another component such as another member or another region, unless otherwise specifically limited, this includes not only the case where it is directly above (or below) the other component, but also the case where it is above (or below) the other component, that is, it also includes the case where another component is included in between above (or below) the other component.

[0015] As described above, conventionally, as the base material of the gas barrier film in the outer wrapping material for the vacuum insulation material, a PET film has been preferably used. FIG. 6 is a schematic cross-sectional view showing an example of a conventional outer wrapping material for the vacuum insulation material. The outer wrapping material 60 for the vacuum insulation material shown in FIG. 6 has, in the thickness direction, a heat-sealable layer 61, a first gas barrier film F1, a second gas barrier film F2, and a protective film 65. Adhesive layers 64 are disposed between the heat-sealable layer 61 and the first gas barrier film F1, between the first gas barrier film F1 and the second gas barrier film F2, and between the second gas barrier film F2 and the protective film 65. The first gas barrier film F1 has a PET film 62 and a gas barrier layer 63 disposed on the surface of the PET film 62 opposite to the heat-sealable layer 61. The second gas barrier film F2 has a PET film 62 and a gas barrier layer 63 disposed on the surface of the PET film 62 on the heat-sealable layer 61 side. As shown in FIG. 6, generally, the outer wrapping material for the vacuum insulation material has a plurality of gas barrier films. Among the plurality of gas barrier films, the first gas barrier film F1 located on the innermost side (the direction on the core material side in the thickness direction when the vacuum insulation material is used) is often directly laminated on the heat-sealable layer 61 via the adhesive layer 64. This is a natural design in terms of the manufacturing process and cost if there is no particular reason to dispose another layer other than the adhesive layer between the gas barrier film and the heat-sealable layer.

[0016] The inventor of the present application examined the reason why the thermal conductivity of a vacuum heat insulating material manufactured using an outer packaging material applied with a gas barrier film having a PET film was high, and speculated that it was because the PET film has a high gas solubility coefficient and contains a large amount of dissolved gases such as nitrogen, oxygen, and carbon dioxide in the PET film. For example, the solubility coefficient of carbon dioxide in a PET film (Mylar film) at 25°C is 16.6×10 -3 cc / cc·cmHg (literature value). The solubility coefficient S can be calculated by the permeation coefficient P / diffusion coefficient D. The above literature value is the value described in "Materials and Moisture Handbook - Moisture Absorption, Moisture Prevention, Humidity Control, Drying -" Kyoritsu Shuppan Co., Ltd. 1968 (p. 387).

[0017] The vacuum heat insulating material is manufactured, for example, as follows. Prepare two outer packaging materials for the vacuum heat insulating material, stack them with their heat-weldable layers facing each other, heat-seal the outer edges of three sides, and obtain a bag body with one side open. After putting the core material into this bag body through the opening, insert it into a vacuum chamber, suck air from the opening, and seal the opening in a state where the inside of the bag body is depressurized to obtain a vacuum heat insulating material.

[0018] The movement of the dissolved gas in the conventional outer packaging material for the vacuum heat insulating material during this depressurization will be described with reference to FIGS. 7(a) and 7(b). FIG. 7(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 7(a). Also, the movement of the dissolved gas in the conventional outer packaging material for the vacuum heat insulating material in the atmosphere after the manufacture of the vacuum heat insulating material will be described with reference to FIGS. 8(a) and 8(b). FIG. 8(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 8(a).

[0019] As shown in Fig. 7(a), after inserting the core material 71 through the opening 72 of the bag body 75 obtained from the outer wrapping material 60 for the vacuum insulation material, it is inserted into the vacuum chamber C, and the inside of the vacuum chamber C is decompressed. As shown in Figs. 7(a) and 7(b), during decompression, the dissolved gas G in the outer wrapping material 60 moves toward the inside or outside of the bag body 75. The dissolved gas G that has moved inside the bag body 75 is discharged from the opening 72 to the outside of the bag body 75. However, since there is a large amount of dissolved gas G in the PET film 62, the dissolved gas G in the PET film 62 is not completely discharged to the outside of the bag body 75, and a large amount of dissolved gas G remains in the PET film 62. In this state, when the opening 72 is sealed and the vacuum insulation material 70 is formed as shown in Fig. 8(a), as shown in Fig. 8(b), the dissolved gas G in the PET film 62 penetrates into the inside of the vacuum insulation material 70, deteriorating the internal vacuum degree of the vacuum insulation material 70. In particular, from the PET film 62 disposed immediately outside the heat-sealable layer 61 (the direction opposite to the direction (inside) on the core material side in the thickness direction when used as a vacuum insulation material), the dissolved gas G easily penetrates into the inside of the vacuum insulation material 70, and the deterioration of the internal vacuum degree of the vacuum insulation material 70 becomes remarkable.

[0020] In response to such a problem, the inventor of the present application has found that by disposing a polyolefin-based resin layer having a lower solubility coefficient than the PET film in the outer wrapping material, an increase in the thermal conductivity of the vacuum insulation material can be suppressed, and the present invention has been completed.

[0021] Hereinafter, the outer wrapping material for the vacuum insulation material, the vacuum insulation material, and the article with the vacuum insulation material in the present disclosure will be described respectively.

[0022] A. Outer wrapping material for vacuum insulation material The outer wrapping material for the vacuum insulation material in the present disclosure has a polyolefin-based resin layer.

[0023] FIG. 1 is a schematic cross-sectional view showing an example of an outer packaging material for a vacuum insulating material in the present disclosure. As shown in FIG. 1, the outer packaging material 10 for a vacuum insulating material is characterized by having a polyolefin resin layer 1. As shown in FIG. 1, the outer packaging material 10 for a vacuum insulating material preferably has a polyolefin resin layer 1 and a heat-sealable layer 2. Further, the outer packaging material 10 for a vacuum insulating material preferably has at least one gas barrier film (two gas barrier films F1 and F2 in FIG. 1), a polyolefin resin layer 1, and a heat-sealable layer 2 in this order in the thickness direction.

[0024] The outer packaging material 10 for a vacuum insulating material shown in FIG. 1 has two gas barrier films (a first gas barrier film F1 and a second gas barrier film F2). The first gas barrier film F1 and the second gas barrier film F2 each have a resin substrate 3 and a gas barrier layer 4 disposed on the surface of the resin substrate 3 on the heat-sealable layer 2 side. Also, an adhesive layer 5 is disposed between the heat-sealable layer 2 and the polyolefin resin layer 1, between the polyolefin resin layer 1 and the first gas barrier film F1, and between the first gas barrier film F1 and the second gas barrier film F2.

[0025] The outer packaging material for a vacuum insulating material in the present disclosure has a polyolefin resin layer having a lower solubility coefficient than a PET film, that is, a smaller amount of dissolved gas than a PET film. The solubility coefficient of carbon dioxide at 20°C for a polypropylene film (density 0.9083 g / cm 3 , uniaxially oriented) is 4.8×10 -3 cc / cc·cmHg (literature value). Also, the solubility coefficient of carbon dioxide at 24°C for a polyethylene film (density 0.9205 g / cm 3 , non-oriented) is 3.2×10 -3 cc / cc·cmHg (literature value). The above literature values are the values described in "Materials and Moisture Handbook - Moisture Absorption, Moisture Prevention, Humidity Control, Drying -", Kyoritsu Shuppan Co., Ltd., 1968 (pp. 386 - 387).

[0026] The movement of dissolved gas in the outer packaging material for the vacuum insulation material of the present disclosure during decompression in the production of the vacuum insulation material will be described with reference to FIGS. 3(a) and 3(b). FIG. 3(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 3(a). Further, the movement of the dissolved gas in the outer packaging material for the vacuum insulation material of the present disclosure after the production of the vacuum insulation material will be described with reference to FIGS. 4(a) and 4(b). FIG. 4(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 4(a).

[0027] As shown in FIG. 3(a), in the production of the vacuum insulation material, two outer packaging materials 10 for the vacuum insulation material are prepared, the heat-sealable layers thereof are overlapped facing each other, the outer edges of three sides are heat-sealed, and a bag body 15 with one side open is obtained. After the core material 11 is inserted into this bag body 15 through the opening 52, it is inserted into the vacuum chamber C, and air is sucked from the above-mentioned opening 52. By sealing the opening 52 in a state where the inside of the bag body 15 is decompressed, a vacuum insulation material 50 is obtained as shown in FIG. 4(a).

[0028] As shown in FIG. 3(b), during decompression, the dissolved gas G in the outer packaging material 10 moves toward the inside or outside of the bag body 15. The dissolved gas G that has moved inside the bag body 15 is discharged from the opening 52 to the outside of the bag body 15. Since the outer packaging material 10 in the present disclosure has the polyolefin resin layer 1 with less dissolved gas than the PET film, the dissolved gas can be reduced in the entire outer packaging material 10. Even when the outer packaging material 10 has the gas barrier films F1 and F2 in which the resin base material 3 is a PET film, the dissolved gas can be reduced in the entire outer packaging material 10 because the outer packaging material 10 has the polyolefin resin layer 1. Further, since the amount of the dissolved gas G in the polyolefin resin layer 1 is small, most of the dissolved gas G in the polyolefin resin layer 1 is discharged to the outside of the bag body 15 by decompression, and the amount of the dissolved gas G in the polyolefin resin layer 1 decreases. As a result, the amount of the dissolved gas G in the entire outer packaging material 10 decreases. The vacuum insulation material 50 obtained by sealing the opening 52 in this state has less dissolved gas G in the outer packaging material 10 as shown in FIG. 4(b), so that the amount of the dissolved gas that penetrates into the vacuum insulation material 50 also decreases. Therefore, the deterioration of the internal vacuum degree of the vacuum insulation material is suppressed.

[0029] Hereinafter, each configuration and characteristic of the outer packaging material for a vacuum insulation material in the present disclosure will be described in detail.

[0030] 1. Polyolefin resin layer The outer packaging material for a vacuum insulation material in the present disclosure has a polyolefin resin layer.

[0031] It is preferable that no layer having gas barrier properties is disposed on either surface of the polyolefin resin layer. In this regard, the polyolefin resin layer is distinguished from the resin base material in the gas barrier film described later.

[0032] The polyolefin resin layer is positioned closer to the core material side (inner side) in the thickness direction when used as a vacuum insulation material, so that the deterioration of the internal vacuum degree of the vacuum insulation material is suppressed. Therefore, the polyolefin resin layer is preferably disposed in direct contact with a heat-sealable layer, or directly laminated on a heat-sealable layer via an adhesive layer.

[0033] For the above reasons, when the outer packaging material for a vacuum insulation material in the present disclosure has a gas barrier film and a heat-sealable layer described later, the polyolefin resin layer is preferably disposed between the gas barrier film and the heat-sealable layer. By disposing the polyolefin resin layer in the direction (inner side) of the core material side in the thickness direction when used as a vacuum insulation material rather than the gas barrier film, the deterioration of the internal vacuum degree due to dissolved gas can be further suppressed.

[0034] Furthermore, when the outer packaging material for a vacuum insulation material in the present disclosure has two or more gas barrier films, the polyolefin resin layer is preferably disposed between the gas barrier film located on the side closest to the heat-sealable layer among the two or more gas barrier films and the heat-sealable layer.

[0035] In the present disclosure, the "polyolefin resin layer" means a layer containing a polyolefin resin as a main component. The polyolefin resin may be a homopolymer of an olefin or a copolymer of an olefin. The copolymer of an olefin may be a copolymer of two or more olefins or a copolymer of an olefin and a monomer other than an olefin. Examples of the polyolefin resin include polyethylene-based resins and polypropylene-based resins. Among them, polypropylene-based resins are preferred.

[0036] The polyethylene-based resin refers to a polymer in which the content ratio of the constituent units derived from ethylene is 50 mol% or more in all the repeating constituent units. In this polymer, the content ratio of the constituent units derived from ethylene is preferably 70 mol% or more, more preferably 80 mol% or more, still more preferably 90 mol% or more, and particularly preferably 95 mol% or more. The polyethylene-based resin may be a homopolymer of ethylene or a copolymer of ethylene. The copolymer of ethylene may be a copolymer of ethylene and an olefin other than ethylene, or a copolymer of ethylene and a monomer other than an olefin. The polyethylene-based resin may be used alone or in combination of two or more.

[0037] Examples of the polyethylene-based resin include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and ultra-low density polyethylene.

[0038] The polypropylene-based resin refers to a polymer in which the content ratio of the constituent units derived from propylene is 50 mol% or more in all the repeating constituent units. In this polymer, the content ratio of the constituent units derived from propylene is preferably 70 mol% or more, more preferably 80 mol% or more, still more preferably 90 mol% or more, and particularly preferably 95 mol% or more. The polypropylene-based resin may be a homopolymer of propylene or a copolymer of propylene. The copolymer of propylene may be a copolymer of propylene and an olefin other than propylene, or a copolymer of propylene and a monomer other than an olefin. The polypropylene-based resin may be used alone or in combination of two or more.

[0039] As the polyolefin-based resin layer, a film can be used. The film may be an unstretched film or a stretched film. Further, the stretched film may be a uniaxially stretched film or a biaxially stretched film. Among them, a polypropylene film is preferable, and a stretched polypropylene film is more preferable. This is because when used as a vacuum heat insulating material, the strength against piercing of the core material (piercing strength) can be increased.

[0040] That the polyolefin resin layer is a stretched polypropylene film is confirmed by using the X-ray diffraction method. In the method by the X-ray diffraction method (CuKα ray, wavelength = 1.5418 Å), for example, the target film is rotated by 15° in the plane direction, and in-plane measurement is performed at each angle. In the case of a stretched polypropylene film, a peak indicating the 110 plane of polypropylene crystals is strongly observed at a position where 2θ (deg) = 13.0 to 15.0 in measurement from a specific direction. On the other hand, in the case of an unstretched polypropylene film, such a peak is observed with a constant intensity regardless of the measurement direction. Thus, by using the X-ray diffraction method, a stretched polypropylene film and an unstretched polypropylene film can be discriminated.

[0041] The thickness of the polyolefin resin layer is not particularly limited, but is preferably 10 μm or more, more preferably 20 μm or more, and particularly preferably 30 μm or more. When the thickness of the polyolefin resin layer is within the above range, the piercing strength is improved. On the other hand, the thickness of the polyolefin resin layer is, for example, 200 μm or less, and may be 100 μm or less. When the thickness of the polyolefin resin layer is within the above range, sufficient flexibility can be maintained. Specifically, the thickness of the polyolefin resin layer is preferably 10 μm or more and 200 μm or less, more preferably 20 μm or more and 200 μm or less, and particularly preferably 30 μm or more and 100 μm or less.

[0042] The outer wrapping material for the vacuum heat insulating material in the present disclosure may have at least one layer of a polyolefin resin layer, or may have two or more layers.

[0043] 2. Heat-sealable layer The outer packaging material for the vacuum insulation material in the present disclosure preferably has a heat-weldable layer on one main surface side. The heat-weldable layer is a layer that can be welded by heating. The heat-weldable layer is a member that covers one surface in the thickness direction of the outer packaging material for the vacuum insulation material. When manufacturing a vacuum insulation material using the outer packaging material for the vacuum insulation material in the present disclosure, it comes into contact with the core material. Also, when sealing the core material, it is a member that joins the ends of the opposing outer packaging materials for the vacuum insulation material to each other.

[0044] As the material of the heat-weldable layer, for example, since it can be melted and fused by heating, for example, thermoplastic resins, hot-melt resins, etc. can be used. Specifically, polyolefin resins such as polyethylene, polypropylene, and cyclic polyolefin, polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyvinyl acetate resins, polyvinyl chloride resins, poly(meth)acrylic resins, and urethane resins can be mentioned. Among them, polyolefin resins are preferred. As described above, since the layer containing a polyolefin resin has a small amount of dissolved gas, when used as a vacuum insulation material, the amount of dissolved gas that penetrates inside can be reduced, and the deterioration of the internal vacuum degree can be more effectively suppressed.

[0045] The heat-weldable layer may contain additives such as an anti-blocking agent, a lubricant, a flame retardant, and a filler, if necessary.

[0046] The thickness of the heat-weldable layer may be any thickness that can obtain a desired adhesive force when the outer packaging materials for the vacuum insulation material are joined. For example, it is preferably 15 μm or more and 100 μm or less, more preferably 25 μm or more and 90 μm or less, and even more preferably 30 μm or more and 80 μm or less.

[0047] 3. Gas barrier film The outer wrapping material for the vacuum insulation material in the present disclosure preferably has a gas barrier film. The gas barrier film is disposed outside the heat-sealable layer and serves as a barrier against gases such as oxygen and water vapor, suppressing the intrusion of gases from the outside to the inside of the vacuum insulation material. In the outer wrapping material in the present disclosure, it is preferable that the gas barrier film is disposed outside the polyolefin resin layer. That is, the outer wrapping material in the present disclosure preferably has a gas barrier film on the surface opposite to the heat-sealable layer of the polyolefin resin layer. This is because when the polyolefin resin layer is disposed inside the gas barrier film, the effect of suppressing the intrusion of dissolved gas into the vacuum insulation material is more effectively exerted.

[0048] The outer wrapping material for the vacuum insulation material in the present disclosure may have one gas barrier film or may have two or more gas barrier films. Among them, it is preferable that the outer wrapping material for the vacuum insulation material in the present disclosure has two or more gas barrier films. This is to improve the gas barrier property. When the outer wrapping material has two or more gas barrier films, it is preferable that all the gas barrier films are disposed outside the polyolefin resin layer.

[0049] The gas barrier film has, for example, a resin base material and a gas barrier layer disposed on at least one surface of the resin base material. When the outer packaging material has one gas barrier film, in the gas barrier film, it is preferable that the gas barrier layer is disposed on the layer side heat-sealable to the resin base material. This is because it can suppress the gas dissolved in the resin base material from entering the inside of the vacuum insulation material. Further, when the outer packaging material has two or more gas barrier films, in the gas barrier film located innermost among the two or more gas barrier films, it is preferable that the gas barrier layer is disposed on the layer side heat-sealable to the resin base material. Similarly to the above, it can suppress the gas dissolved in the resin base material from entering the inside of the vacuum insulation material. Further, when the outer packaging material has two or more gas barrier films, in the gas barrier film located outermost among the two or more gas barrier films, it is preferable that the gas barrier layer is disposed on the layer side heat-sealable to the resin base material. The gas barrier layer can be protected by the resin base material.

[0050] (1) Resin base material As the resin base material, a film is preferably used. When the resin base material is a film, the film may be an unstretched film or a stretched film. Further, the stretched film may be a uniaxially stretched film or a biaxially stretched film.

[0051] The resin base material may or may not have transparency. As the material of the resin base material, for example, polyolefin resins such as polyethylene, polypropylene, and cyclic polyolefin, polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), poly(meth)acrylic resin, polycarbonate resin, ethylene-vinyl ester copolymer and its saponified product, polyamide resins such as various nylons, polyimide resin, urethane resin, acetal resin, and cellulose resin can be used.

[0052] The resin substrate may contain various plastic compounding agents, additives, etc. Examples of the additives include lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and modifying resins.

[0053] The thickness of the resin substrate is not particularly limited, but is, for example, 6 μm or more and 200 μm or less, preferably 9 μm or more and 100 μm or less.

[0054] (2) Gas barrier layer The gas barrier film in the present disclosure has a gas barrier layer disposed on at least one surface of the resin substrate. It is preferable that the gas barrier layer is in direct contact with the resin substrate. Examples of the gas barrier layer include inorganic films and coating films. The gas barrier layer may have an inorganic film, may have a coating film, or may have both an inorganic film and a coating film.

[0055] (a) Inorganic film Examples of the inorganic film include metal films and inorganic compound films.

[0056] The metal film is a thin film formed of a metal or an alloy, and a metal film known as a gas barrier film can be used. For example, thin films containing metals such as aluminum, stainless steel, titanium, nickel, iron, and copper, and thin films containing alloys containing one or more of the above metals are included.

[0057] The inorganic compound film is a thin film mainly composed of an inorganic compound. For example, thin films containing oxides or nitrides of metal elements or non-metal elements such as silicon (silica), aluminum, stainless steel, titanium, nickel, iron, copper, magnesium, calcium, potassium, tin, sodium, boron, lead, zinc, zirconium, and yttrium are included.

[0058] The inorganic film may be a vapor deposition film formed by a vapor deposition method or a coating film formed by a coating method such as coating. Among them, a vapor deposition film is preferable from the viewpoint of high adhesion to the resin substrate and the ability to exhibit high gas barrier properties. The vapor deposition film may be formed by a single vapor deposition or by multiple vapor depositions. That is, one inorganic film may be a single film formed by a single vapor deposition or a multilayer film formed by multiple vapor depositions. When the inorganic film is a multilayer film, films having the same composition may be combined, or films having different compositions may be combined.

[0059] The thickness of the inorganic film is not particularly limited as long as it can exhibit the desired gas barrier properties and can be appropriately set according to the type of the inorganic film. The thickness of the gas barrier layer will be described later. When the inorganic film is formed by multiple vapor depositions, the thickness of the inorganic film refers to the total thickness after multiple vapor depositions.

[0060] (b) Coating film Examples of the coating film include (b1) a film having an M-O-P bond (where M represents an inorganic atom, O represents an oxygen atom, and P represents a phosphorus atom), (b2) a film containing a polyvalent metal salt of a polycarboxylic acid-based polymer, and (b3) a mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin.

[0061] (b1) Film having an M-O-P bond Examples of the film having an M-O-P bond (where M represents a metal atom, O represents an oxygen atom, and P represents a phosphorus atom) include a film containing a reaction product of a metal oxide and a phosphorus compound.

[0062] Examples of the above metal oxides include oxides of metals having a valence of 2 or more. Specifically, oxides of metals in Group 2 of the periodic table such as magnesium and calcium, oxides of metals in Group 12 of the periodic table such as zinc, oxides of metals in Group 13 of the periodic table such as aluminum, oxides of metals in Group 14 of the periodic table such as silicon, and oxides of transition metals such as titanium and zirconium can be mentioned. Among them, aluminum oxide (alumina) is preferable.

[0063] In addition, examples of the phosphorus compound include phosphoric acid, polyphosphoric acid, phosphorous acid, phosphonic acid, and their derivatives. Among them, phosphoric acid is preferable. Specific reaction products of the metal oxide and the phosphorus compound are the same as those disclosed in, for example, JP-A-2011-226644.

[0064] The presence of the M-O-P bond is confirmed by the appearance of a maximum infrared absorption peak in the range of 800 cm -1 to 1400 cm -1 or less (in the following range) at 1080 cm -1 to 1130 cm -1 or less in the infrared absorption spectrum. The method for measuring the infrared absorption spectrum is not particularly limited. For example, a measurement method by the total reflection measurement method (ATR method), a method of scraping a sample from the gas barrier layer of the outer packaging material and measuring its infrared absorption spectrum by the KBr method, a method of measuring the collected sample by microscopic infrared spectroscopy, etc. can be used.

[0065] (b2) A film containing a polyvalent metal salt of a polycarboxylic acid-based polymer The film containing the polyvalent metal salt of the polycarboxylic acid-based polymer has a cross-linking bond by polyvalent metal ions between the carboxyl groups of the polycarboxylic acid-based polymer. The polyvalent metal salt of the polycarboxylic acid-based polymer is a reaction product of a polycarboxylic acid-based polymer and a polyvalent metal compound.

[0066] The presence of the polyvalent metal salt of the polycarboxylic acid-based polymer is confirmed by the appearance of an absorption peak having an absorption maximum near 1560 cm -1 to 1659 cm -1 or less in the infrared absorption spectrum. The above peak is a peak of the C=O stretching vibration attributed to the carboxyl group (-COO-) forming a salt with the polyvalent metal. Usually, the C=O stretching vibration attributed to the salt (-COO-) of the carboxyl group is in the range of 1490 cm -1 to 1659 cm -1 or less. -1In the following infrared wave number region, an absorption peak having an absorption maximum near 1560 cm -1 is provided. The infrared absorption spectrum can be measured by a transmission method, an ATR method (attenuated total reflection method), a KBr pellet method, a diffuse reflection method, a photoacoustic method (PAS method), or the like.

[0067] Examples of the polycarboxylic acid polymer include polymers having two or more carboxyl groups in the molecule. For example, homopolymers or copolymers of monomers having a carboxyl group such as polyacrylic acid, polymethacrylic acid, polymaleic acid, polyitaconic acid, and acrylic acid-methacrylic acid copolymer can be mentioned.

[0068] The polyvalent metal compound is not particularly limited as long as it can crosslink the carboxyl group of the polycarboxylic acid polymer. For example, hydroxides, carbonates, and carboxylates of metals such as alkaline earth metals, Group 8 metals of the periodic table, Group 11 metals of the periodic table, Group 12 metals of the periodic table, and Group 13 metals of the periodic table can be mentioned. Specifically, divalent or higher metals such as magnesium (Mg), calcium (Ca), barium (Ba), zinc (Zn), copper (Cu), cobalt (Co), nickel (Ni), aluminum (Al), iron (Fe), oxides, hydroxides, halides, carbonates, phosphates, phosphites, hypophosphites, sulfates, and sulfites of these metals can be mentioned. These may be used alone or in combination of two or more.

[0069] Examples of the polyvalent metal salt of the polycarboxylic acid polymer include zinc acrylate, zinc methacrylate, sodium acrylate, potassium acrylate, magnesium acrylate, calcium acrylate, aluminum acrylate, sodium methacrylate, potassium methacrylate, magnesium methacrylate, and calcium methacrylate.

[0070] The film containing the polyvalent metal salt of the polycarboxylic acid-based polymer can further contain a binder resin. As the above binder resin, a hydrophilic binder or a hydrophobic binder can be used. Examples of the hydrophilic binder include polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium alginate, ethylene-vinyl alcohol copolymer, starch, dextran, gelatin, and modified products thereof. At least one kind selected from these groups can be used as the binder resin.

[0071] The film containing the polyvalent metal salt of the polycarboxylic acid-based polymer can be formed, for example, by applying a barrier layer-forming solution in which a carboxylic acid-based resin, a polyvalent metal compound, and a binder resin are dissolved in a solvent and irradiating with an electron beam. Further, a film containing the polyvalent metal salt of the polycarboxylic acid-based polymer can be formed by laminating the polycarboxylic acid-based polymer layer and the polyvalent metal compound-containing layer adjacent to each other and causing an interlayer reaction.

[0072] (b3) Mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin The mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin has the general formula R 1 n M(OR 2 ) m (wherein, in the formula, R 1 , R 2 represents an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents the valence of M). It contains at least one or more metal alkoxides represented by the formula and a hydrophilic group-containing resin, and further contains a sol-gel compound obtained by polycondensation by the sol-gel method. Hereinafter, the mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin is referred to as a sol-gel compound film.

[0073] The sol-gel compound film can have a cross-linking bond C-O-M bond via oxygen (O) between the carbon atom (C) in the hydrophilic group-containing resin and the metal atom (M) in the metal alkoxide.

[0074] The metal alkoxide has the general formula R 1 n M(OR 2 ) m and may be a partial hydrolyzate of the alkoxide, a hydrolysis condensate of the alkoxide, etc. Examples of M include silicon, zirconium, titanium, and aluminum. Also, examples of R 1 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a t-butyl group, an n-hexyl group, and an n-octyl group. Examples of R 2 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and a sec-butyl group. When there are a plurality of (OR 2 ) in the same molecule, (OR 2 ) may be the same or different.

[0075] Among them, the metal alkoxide is preferably an alkoxysilane containing silicon. Examples of the alkoxysilane include tetramethoxysilane Si(OCH3)4, tetraethoxysilane Si(OC2H5)4, tetrapropoxysilane Si(OC3H7)4, tetrabutoxysilane Si(OC4H9)4, etc.

[0076] The hydrophilic group-containing resin is a resin having a hydrophilic group such as a hydroxy group (-OH), a carboxy group (-COOH), an amino group (-NH2), a carbonyl group (>CO), a sulfo group (-SO3H), etc. Examples of the hydrophilic group-containing resin include a polyvinyl alcohol resin and an ethylene-vinyl alcohol copolymer. These may be used alone or in combination of two or more.

[0077] Examples of the sol-gel compound include a sol-gel compound containing Si, O, and PVA, which is a polycondensate of tetraethoxysilane (TEOS) and polyvinyl alcohol (PVA).

[0078] The sol-gel compound film can be formed, for example, by applying a solution for forming a barrier layer prepared by mixing a metal alkoxide, a hydrophilic group-containing resin, a silane coupling agent, a sol-gel method catalyst, an acid, water, an organic solvent, etc., and performing a heat treatment after drying.

[0079] For other details of the sol-gel compound film, it is made the same as the details disclosed in, for example, Japanese Patent No. 5568897 and JP-A-2017-61956.

[0080] (c) Others The gas barrier layer may be disposed on only one side of the resin substrate, or may be disposed on both sides of the resin substrate, respectively.

[0081] The gas barrier layer may have a single-layer structure or a multilayer structure. In the case of a multilayer structure, films having the same composition may be combined, or films having different compositions may be combined. When the gas barrier layer has a multilayer structure, the entire multilayer structure is regarded as one gas barrier layer. When the gas barrier layer has the above inorganic film, the gas barrier layer may further have a coating film on the surface opposite to the surface of the inorganic film on the resin substrate side.

[0082] The thickness of the gas barrier layer is not particularly limited as long as the desired gas barrier property can be exhibited throughout the outer packaging material, and can be appropriately set according to the type and layer structure of the gas barrier layer. When the gas barrier layer has only an inorganic film, the thickness of the gas barrier layer is, for example, 1 nm or more and 1000 nm or less, and may be 5 nm or more and 500 nm or less, may be 10 nm or more and 400 nm or less, or may be 20 nm or more and 300 nm or less. In addition, when the gas barrier layer is an inorganic film, the upper limit of the thickness of the gas barrier layer can be made thinner. The thickness of the inorganic film is, for example, 5 nm or more and 200 nm or less, and may be 10 nm or more and 150 nm or less. When the gas barrier layer has an inorganic film and a coating film, the thickness of the gas barrier layer is, for example, 100 nm or more and 1000 nm or less, and may be 200 nm or more and 400 nm or less. When the gas barrier layer has a multilayer structure, the thickness of the gas barrier layer refers to the thickness of the entire multilayer structure. If the thickness of the above gas barrier layer is too thin, the desired gas barrier property may not be exhibited. In addition, the strength may not be ensured, and deterioration over time may occur. On the other hand, if the thickness of the above gas barrier layer is too thick, defects may easily occur when subjected to mechanical stress such as bending, or the flexibility may decrease.

[0083] The method for forming the gas barrier layer may be any method capable of forming a film with a desired thickness on one or both sides of the resin substrate, and conventionally known methods can be used according to the type of the gas barrier layer, such as a coating method, a vapor deposition method, a pressure bonding method, etc.

[0084] (3) Others The gas barrier film is not limited to the gas barrier film having the resin base material and the gas barrier layer described above, and may be a gas barrier film having a metal foil. Examples of the metal foil used in the gas barrier film include foils of aluminum, nickel, stainless steel, iron, copper, and titanium. The metal foil has good gas barrier properties and is excellent in bend resistance and puncture resistance. Furthermore, aluminum foil is easy to process and inexpensive. The gas barrier film having a metal foil may be composed of only the metal foil, may be composed of a plurality of metal foils, or may have other layers laminated on the metal foil.

[0085] The thickness of the gas barrier film having a metal foil is not particularly limited, but for example, it is 4 μm or more and 9 μm or less, and may be 5 μm or more and 7 μm or less.

[0086] 4. Adhesive layer In the outer packaging material for the vacuum heat insulating material in the present disclosure, each layer constituting the outer packaging material may be arranged in direct contact by heat welding or the like, or may be arranged via an adhesive layer.

[0087] Examples of the adhesive used for the adhesive layer include a pressure-sensitive adhesive, a thermoplastic adhesive, and a curable adhesive. As the adhesive, for example, a two-component curable adhesive containing a main agent and a curing agent is used. Also, a one-component curable adhesive containing a main agent and a latent curing agent blocked by a known method so as not to react even when mixed with the main agent, or a one-component curable adhesive containing a curing agent and a latent main agent blocked by a known method so as not to react even when mixed with the curing agent may be used.

[0088] As the adhesive, specifically, epoxy adhesives, polyvinyl acetate adhesives, polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives, phenolic resin adhesives, polyurethane adhesives, reactive (meth)acrylic acid adhesives, inorganic rubber adhesives, silicone adhesives, inorganic adhesives composed of alkali metal silicates, low melting point glasses, etc. can be used.

[0089] Among them, polyacrylate adhesives and polyurethane adhesives are preferred as the adhesives. In particular, it is preferable that the adhesive contains a compound having an isocyanate group as a functional group, and specifically, it is preferably a polyurethane adhesive.

[0090] The adhesive may contain any materials such as a curing accelerator, a catalyst, an antioxidant, a stabilizer, an ultraviolet absorber, a light stabilizer, an antistatic agent, etc.

[0091] The thickness of the adhesive layer may be any thickness that can exhibit a desired adhesive strength, and can be appropriately set according to the composition of the adhesive layer, etc. The thickness of the adhesive layer is, for example, 0.1 μm or more and less than 10 μm, and may be 1 μm or more and 4 μm or less.

[0092] The adhesive layer may or may not have transparency. When transparency is required for the outer wrapping material of the vacuum insulation material, the adhesive layer preferably has transparency.

[0093] As the adhesive layer, a sheet-like or film-like adhesive may be used, or an adhesive composition may be applied, dried, and cured to form it.

[0094] 5. Protective Film In the outer packaging material 10 for a vacuum insulating material according to the present disclosure, for example, as shown in FIG. 2, a protective film 6 may be disposed on the main surface side opposite to the heat-weldable layer 2. The protective film is disposed on the side opposite to the heat-weldable layer of the gas barrier film and protects the gas barrier film. Note that the protective film is distinguished from the gas barrier film in that no layer having gas barrier properties is disposed on either surface.

[0095] Examples of the material of the protective film include polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), and polyamide resins such as nylon.

[0096] The thickness of the protective film is not particularly limited, and is, for example, 5 μm or more and 200 μm or less, and may be 10 μm or more and 100 μm or less.

[0097] 6. Characteristics The outer packaging material for a vacuum insulating material according to the present disclosure has excellent gas barrier properties. In the outer packaging material for a vacuum insulating material according to the present disclosure, the initial water vapor permeability is, for example, preferably 0.5 g / (m 2 ·day) or less, more preferably 0.3 g / (m 2 ·day) or less, and even more preferably 0.1 g / (m 2 ·day) or less. Thus, the outer packaging material for a vacuum insulating material according to the present disclosure has excellent water vapor gas barrier properties.

[0098] The water vapor permeability is measured using a water vapor permeability measuring device under the conditions of a temperature of 40° C. and a relative humidity difference of 90% RH in accordance with ISO 15106-5:2015 (differential pressure method). First, a sample of the outer packaging material for a vacuum insulating material cut to a desired size is mounted between the upper chamber and the lower chamber of the above-described apparatus such that the outermost surface layer located on the side opposite to the heat-weldable layer, which is one of the outermost surfaces facing in the thickness direction, is the high-humidity side (water vapor supply side), and the permeation area is about 50 cm 2(Transmission area: a circle with a diameter of 8 cm) Measure under the conditions of a temperature of 40 °C and a relative humidity difference of 90% RH. As the water vapor permeability measuring device, for example, "DELTAPERM" manufactured by Technolox, UK is used. The measurement of the water vapor permeability is performed on at least three samples for one outer packaging material for the vacuum insulation material, and the average of those measured values is taken as the value of the water vapor permeability under those conditions.

[0099] Also, in the outer packaging material for the vacuum insulation material in the present disclosure, the initial oxygen permeability is preferably, for example, 0.5 cc / (m 2 ·day·atm) or less, and more preferably 0.1 cc / (m 2 ·day·atm) or less.

[0100] The oxygen permeability is measured under the conditions of a temperature of 23 °C and a humidity of 60% RH using an oxygen gas permeability measuring device with reference to JIS K7126-2:2006 (Plastics - Films and Sheets - Gas Permeability Test Methods - Part 2: Isobaric Method, Annex A: Test Method for Oxygen Gas Permeability by Electrolytic Sensor Method). As the oxygen gas permeability measuring device, for example, "OXTRAN" manufactured by MOCON, USA is used. The measurement is carried out by mounting in the above device such that the outermost surface on the side opposite to the heat-sealable layer, which is one of the two outermost surfaces facing each other in the thickness direction of the outer packaging material for the vacuum insulation material cut to the desired size, is in contact with the oxygen gas. With a transmission area of about 50 cm 2 (Transmission area: a circle with a diameter of 8 cm), measure the states of the carrier gas and the test gas under the conditions of a temperature of 23 °C and a humidity of 60% RH. During the above measurement, supply the carrier gas into the above device at a flow rate of 10 cc / min for 60 minutes or more for purging. As the above carrier gas, nitrogen gas containing about 5% hydrogen can be used. After purging, flow the test gas into the above device, and measure after ensuring 12 hours as the time from the start of flowing until reaching the equilibrium state. At least 99.5% dry oxygen is used as the test gas. The measurement of the oxygen permeability is performed on at least three samples under one condition, and the average of those measured values is taken as the value of the oxygen permeability under that condition.

[0101] 7. Others The outer packaging material for the vacuum insulation material in the present disclosure may or may not have transparency, and can be appropriately set according to the use of the vacuum insulation material in which the outer packaging material for the vacuum insulation material in the present disclosure is used. Regarding the transparency of the outer packaging material for the vacuum insulation material, it is not defined by a strict transmittance and can be appropriately determined according to the use and the like.

[0102] When the outer packaging material for the vacuum insulation material in the present disclosure has transparency, the vacuum insulation material using the outer packaging material for the vacuum insulation material enables visual recognition of its interior. Therefore, by putting a detection agent together with the core material inside the vacuum insulation material, it becomes possible to visually confirm the internal vacuum state from the change of the detection agent.

[0103] As a manufacturing method of the outer packaging material for the vacuum insulation material in the present disclosure, for example, a method of laminating each previously manufactured film through the above-described adhesive layer can be mentioned. Further, the outer packaging material for the vacuum insulation material in the present disclosure may be manufactured by sequentially extruding and laminating the raw materials of each heat-melted film with a T-die or the like.

[0104] The outer packaging material for the vacuum insulation material in the present disclosure can be used for a vacuum insulation material. In the vacuum insulation material, the outer packaging material for the vacuum insulation material in the present disclosure can be used by being arranged opposite to each other through the core material with the heat-weldable layer on the core material side.

[0105] B. Vacuum Insulation Material The vacuum insulation material in the present disclosure is a vacuum insulation material having a core material and an outer packaging material for enclosing the core material, and the outer packaging material is the above-described outer packaging material for the vacuum insulation material.

[0106] Fig. 5(a) is a schematic perspective view showing an example of the vacuum insulation material in the present disclosure, and Fig. 5(b) is a cross-sectional view taken along the line X-X of Fig. 5(a). The vacuum insulation material 50 illustrated in Fig. 5 has a core material 11 and an outer wrapping material 10 that encloses the core material 11, and the outer wrapping material 10 is the outer wrapping material for the vacuum insulation material described in Fig. 1. The vacuum insulation material 50 is a bag body in which two outer wrapping materials 10 face each other with their respective heat-weldable layers facing each other, and the ends 12 are joined by heat fusion. The core material 11 is enclosed in the bag body, and the inside of the bag body is depressurized.

[0107] According to the present disclosure, since the outer wrapping material that encloses the core material is the outer wrapping material for the vacuum insulation material described above, a vacuum insulation material capable of maintaining good heat insulation performance is obtained.

[0108] Hereinafter, the vacuum insulation material in the present disclosure will be described for each component.

[0109] 1. Outer Wrapping Material for Vacuum Insulation Material The outer wrapping material for the vacuum insulation material in the present disclosure is a member that encloses the core material, and since it is the same as the outer wrapping material for the vacuum insulation material described in the section of "A. Outer Wrapping Material for Vacuum Insulation Material" above, the description here is omitted.

[0110] 2. Core Material The core material in the present disclosure is a member enclosed by the outer wrapping material for the vacuum insulation material. Note that being enclosed means being sealed inside a bag body formed using the outer wrapping material for the vacuum insulation material.

[0111] The core material preferably has a low thermal conductivity. Further, the core material can be a porous material having a porosity of 50% or more, particularly 90% or more.

[0112] As materials constituting the core material, powders, foams, fibrous materials, etc. can be used. The above-mentioned powders can be either inorganic or organic. For example, dry silica, wet silica, aggregated silica powder, conductive powder, calcium carbonate powder, perlite, clay, and talc can be used. Among them, a mixture of dry silica and conductive powder is advantageous when used in the temperature range where an increase in internal pressure occurs because the decrease in heat insulation performance due to the increase in internal pressure of the vacuum insulation material is small. Furthermore, when a substance with a low infrared absorption rate such as titanium oxide, aluminum oxide, or indium-doped tin oxide is added to the above-mentioned materials as a radiation suppression material, the infrared absorption rate of the core material can be reduced.

[0113] As the above-mentioned foam, urethane foam, styrene foam, phenol foam, etc. can be used. Among them, a foam that forms continuous bubbles is preferable.

[0114] The above-mentioned fibrous material may be an inorganic fiber or an organic fiber, but it is preferable to use an inorganic fiber from the viewpoint of heat insulation performance. Examples of such inorganic fibers include glass fibers such as glass wool and glass fiber, alumina fiber, silica alumina fiber, silica fiber, ceramic fiber, and rock wool. These inorganic fibers are preferable in that they have a low thermal conductivity and are easier to handle than powders.

[0115] The core material may be used alone with the above-mentioned materials, or may be a composite material in which two or more materials are mixed.

[0116] 3. Others In the vacuum insulation material in the present disclosure, the core material is enclosed inside an outer package material for the vacuum insulation material, and the inside is depressurized to a vacuum state. The degree of vacuum inside the vacuum insulation material is preferably, for example, 5 Pa or less. This is because heat conduction due to convection of the air remaining inside can be reduced, and excellent heat insulation performance can be exhibited.

[0117] The lower the thermal conductivity of the vacuum insulation material, the more preferable it is. For example, it is preferable that the thermal conductivity (initial thermal conductivity) is 5 mW / (m·K) or less. This is because the vacuum insulation material becomes less likely to conduct heat to the outside and can exhibit a high heat insulation effect. Among them, it is more preferable that the above-mentioned initial thermal conductivity is 4 mW / (m·K) or less. The thermal conductivity shall be the value measured in accordance with JIS A1412-2:1999 under the conditions of 30°C on the high-temperature side, 10°C on the low-temperature side, and an average temperature of 20°C.

[0118] Moreover, in the vacuum insulation material of the present disclosure, since the above-mentioned outer wrapping material for the vacuum insulation material is used, deterioration of the heat insulation performance is suppressed.

[0119] As the manufacturing method of the vacuum insulation material in the present disclosure, a general method can be used. For example, two sheets of the above-mentioned outer wrapping material for the vacuum insulation material are prepared, the heat-weldable layers thereof are overlapped facing each other, the outer edges of three sides are heat-sealed, and a bag body with one side open is obtained. After putting the core material into this bag body through the opening, air is sucked from the opening, and the opening is sealed in a state where the inside of the bag body is decompressed, whereby a vacuum insulation material can be obtained.

[0120] The vacuum insulation material in the present disclosure can be used, for example, for articles that require heat insulation. The above-mentioned articles will be described later.

[0121] C. Article with Vacuum Insulation Material The article with a vacuum insulation material in the present disclosure is an article with a vacuum insulation material having a heat insulation region and a vacuum insulation material, wherein the vacuum insulation material has a core material and an outer wrapping material in which the core material is enclosed, and the outer wrapping material is the above-mentioned outer wrapping material for the vacuum insulation material.

[0122] According to the present disclosure, since the vacuum insulation material used for the article has the above-mentioned outer wrapping material for the vacuum insulation material, the vacuum insulation material can exhibit good heat insulation performance. By providing such a vacuum insulation material to the article, energy saving of the article that becomes a high-temperature environment or a high-temperature and high-humidity environment or the object to which the article is used can be achieved.

[0123] The vacuum insulating material and the outer packaging material for the vacuum insulating material used in the present disclosure have been described in detail in the above-mentioned sections of "B. Vacuum Insulating Material" and "A. Outer Packaging Material for Vacuum Insulating Material", so the description here is omitted.

[0124] The article in the present disclosure has a heat insulation region. Here, the heat insulation region is a region thermally insulated by a vacuum insulating material. For example, it is a region that is heat-insulated or cold-insulated, a region that surrounds a heat source or a cooling source, or a region that is isolated from a heat source or a cooling source. These regions may be a space or an object.

[0125] Examples of the above article include electrical appliances such as refrigerators, freezers, warmers, and coolers, containers such as heat-insulated containers, cold-insulated containers, transport containers, containers, and storage containers, vehicles such as cars, airplanes, and ships, buildings such as houses and warehouses, and building materials such as wall materials and floor materials.

[0126] The present disclosure is not limited to the above embodiments. The above embodiments are examples, and any article that has a configuration substantially the same as the technical idea described in the claims of the present disclosure and exhibits the same operational effects is included in the technical scope of the present disclosure.

[0127] Thus, in the present disclosure, for example, the following inventions are provided.

[0128] [1] An outer packaging material for a vacuum insulating material having a polyolefin resin layer.

[0129] [2] Furthermore, the outer packaging material for a vacuum insulating material according to [1], which has a heat-sealable layer.

[0130] [3] The outer packaging material for a vacuum insulating material according to [2], which has a gas barrier film on the surface of the polyolefin resin layer opposite to the heat-sealable layer.

[0131] [4] The above polyolefin resin layer contains a polypropylene resin and is an outer package material for a vacuum insulation material as described in any one of [1] to [3].

[0132] [5] The above polyolefin resin layer is a stretched polypropylene film and is an outer package material for a vacuum insulation material as described in any one of [1] to [4].

[0133] [6] The above gas barrier film has a resin substrate and a gas barrier layer disposed on at least one surface of the resin substrate, and is an outer package material for a vacuum insulation material as described in [3].

[0134] [7] The above resin substrate is a polyester resin film, and is an outer package material for a vacuum insulation material as described in [6].

[0135] [8] The above polyester resin film is a polyethylene terephthalate (PET) film, and is an outer package material for a vacuum insulation material as described in [7].

[0136] [9] The above gas barrier layer has an inorganic film, and is an outer package material for a vacuum insulation material as described in any one of [6] to [8].

[0137]

[10] The above gas barrier layer has a coating film, and is an outer package material for a vacuum insulation material as described in any one of [6] to [8].

[0138]

[11] The above gas barrier film has the gas barrier layer on the surface of the resin substrate on the heat-weldable layer side, and is an outer package material for a vacuum insulation material as described in any one of [6] to

[10] .

[0139]

[12] The thickness of the above polyolefin resin layer is 10 μm or more, and is an outer package material for a vacuum insulation material as described in any one of [1] to

[11] .

[0140]

[13] A vacuum insulation material having a core material and an outer wrapping material encapsulating the core material, wherein the outer wrapping material is the outer wrapping material for a vacuum insulation material described in any one of [1] to

[12] .

[0141]

[14] An article having a heat insulation region and an article with a vacuum insulation material comprising the vacuum insulation material, wherein the vacuum insulation material has a core material and an outer wrapping material encapsulating the core material, and the outer wrapping material is the outer wrapping material for a vacuum insulation material described in any one of [1] to

[12] .

Explanation of reference numerals

[0142] 1... Polyolefin resin layer 2... Heat-sealable layer 3... Resin substrate 4... Gas barrier layer 5... Adhesive layer 6... Protective film 10... Outer wrapping material for vacuum insulation material 11... Core material 50... Vacuum insulation material

Claims

1. An outer package material for a vacuum heat insulating material, having a polyolefin resin layer.

2. The outer package material for a vacuum heat insulating material according to Claim 1, further having a heat-sealable layer.

3. The outer package material for a vacuum heat insulating material according to Claim 2, having a gas barrier film on the surface of the polyolefin resin layer opposite to the heat-sealable layer.

4. The outer package material for a vacuum heat insulating material according to Claim 1, wherein the polyolefin resin layer contains a polypropylene resin.

5. The outer package material for a vacuum heat insulating material according to Claim 1, wherein the polyolefin resin layer is a stretched polypropylene film.

6. The outer package material for a vacuum heat insulating material according to Claim 3, wherein the gas barrier film has a resin substrate and a gas barrier layer disposed on at least one surface of the resin substrate.

7. The outer package material for a vacuum heat insulating material according to Claim 6, wherein the resin substrate is a polyester resin film.

8. The outer package material for a vacuum heat insulating material according to Claim 7, wherein the polyester resin film is a polyethylene terephthalate film.

9. The outer package material for a vacuum heat insulating material according to Claim 6, wherein the gas barrier layer has an inorganic film.

10. The outer package material for a vacuum heat insulating material according to Claim 6, wherein the gas barrier layer has a coating film.

11. The outer package material for a vacuum heat insulating material according to Claim 6, wherein the gas barrier film has the gas barrier layer on the surface of the resin substrate on the heat-sealable layer side.

12. The outer package material for a vacuum heat insulating material according to Claim 1, wherein the thickness of the polyolefin resin layer is 10 μm or more.

13. A vacuum insulation material having a core material and an outer wrapping material enclosing the core material, wherein the outer wrapping material is the outer wrapping material for a vacuum insulation material according to any one of claims 1 to 12.

14. An article with a vacuum insulation material, comprising an article having a heat insulation region and a vacuum insulation material, wherein the vacuum insulation material has a core material and an outer wrapping material enclosing the core material, and the outer wrapping material is the outer wrapping material for a vacuum insulation material according to any one of claims 1 to 12.

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