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 thereof.SOLUTION: An outer packaging material for a vacuum heat insulation material including a polyester resin layer and an outgassing prevention layer having a predetermined thickness 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, for the purpose of energy saving of articles, vacuum insulating materials have been used. 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 atmospheric pressure, and since internal heat convection is suppressed, good heat insulation performance can be exhibited. Note that 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, polyethylene terephthalate (PET) films are preferably used as the base materials of gas barrier films. PET films are inexpensive, have high mechanical strength, and also have high heat resistance. These properties lead to high processability in the process of forming a gas barrier layer on the base material, making it easy to manufacture a gas barrier film with high gas barrier properties. Also, toughness is an advantage even when applied to outer packaging materials for vacuum insulation materials.

[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 thermal conductivity of the vacuum insulation material increases and the problem of deterioration of the heat insulation performance occurs.

[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, which has a polyester resin layer and a gas leakage prevention layer having a predetermined thickness.

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

[0010] Another embodiment of the present disclosure provides 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 in which the core material is enclosed, and the outer packaging material is the above-described outer packaging material for a vacuum insulation material.

Advantages 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

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0013] The present disclosure includes, in embodiments, an outer wrapper for a vacuum insulation material, a vacuum insulation material, and an article with a vacuum insulation material. 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 description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the embodiments, but this is merely an example and does not limit the interpretation of the present disclosure. Further, in this specification and each drawing, elements similar to those described above with respect to the previously presented drawings may be denoted by the same reference numerals, and detailed descriptions thereof may be omitted as appropriate. Also, for convenience of explanation, the terms "above" or "below" may be used in the description, but the up and down directions may be reversed.

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

[0015] As described above, conventionally, a PET film has been preferably used as the base material of the gas barrier film in the outer wrapper for a vacuum insulation material. FIG. 8 is a schematic cross-sectional view showing an example of a conventional outer wrapper for a vacuum insulation material. The outer wrapper 60 for a vacuum insulation material shown in FIG. 8 has, in the thickness direction, a heat-sealable layer 61, a first gas barrier film F11, a second gas barrier film F12, and a protective film 65. Adhesive layers 64 are disposed between the heat-sealable layer 61 and the first gas barrier film F11, between the first gas barrier film F11 and the second gas barrier film F12, and between the second gas barrier film F12 and the protective film 65. Each of the first gas barrier film F11 and the second gas barrier film F12 has a PET film 62 and a gas barrier layer 63 disposed on one surface of the PET film 62.

[0016] As shown in FIG. 8, generally, an outer wrapper for a vacuum insulation material has a plurality of gas barrier films. Among the plurality of gas barrier films, the first gas barrier film F11 located on the innermost side (the direction on the core material side in the thickness direction when the vacuum insulation material is considered) 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.

[0017] Also, as shown in FIG. 8, generally, in the first gas barrier film F11 located on the innermost side (the direction on the core material side in the thickness direction when the vacuum insulation material is considered) among the plurality of gas barrier films, the gas barrier layer 63 is disposed on the side opposite to the heat-sealable layer 61 with respect to the PET film 62. This is because, in the first gas barrier film F11, the puncture resistance of the outer wrapper 60 for the vacuum insulation material is better when the gas barrier layer 63 is disposed on the side opposite to the heat-sealable layer 61 with respect to the PET film 62 than when the gas barrier layer 63 is disposed on the side of the heat-sealable layer 61 with respect to the PET film 62, so that a decrease in the heat insulation performance can be suppressed. Further, when laminating the first gas barrier film F11 and the heat-sealable layer 61 via the adhesive layer 64, it is to protect the gas barrier layer 63 of the first gas barrier film F11 and suppress a decrease in the gas barrier property due to damage to the gas barrier layer 63. Furthermore, the lamination strength is higher when laminating the surface on the PET film 62 side of the first gas barrier film F11 and the heat-sealable layer 61 via the adhesive layer 64 than when laminating the surface on the gas barrier layer 63 side of the first gas barrier film F11 and the heat-sealable layer 61 via the adhesive layer 64.

[0018] 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 to which a gas barrier film having a PET film is applied is high, and speculated that it is 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).

[0019] 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 above opening, and seal the opening in a state where the inside of the bag body is decompressed, thereby obtaining a vacuum heat insulating material.

[0020] The movement of the dissolved gas in the conventional outer packaging material for the vacuum heat insulating material during this decompression will be described with reference to FIGS. 9(a) and 9(b). FIG. 9(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 9(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. 10(a) and 10(b). FIG. 10(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 10(a).

[0021] As shown in Fig. 9(a), after inserting the core material 71 through the opening 72 of the bag body 75 obtained from the outer packaging material 60 for the vacuum insulation material, it is inserted into the vacuum chamber C, and the inside of the vacuum chamber C is depressurized. As shown in Fig. 9(a) and Fig. 9(b), during depressurization, the dissolved gas G in the outer packaging 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. 10(a), as shown in Fig. 10(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 the vacuum insulation material is formed), 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.

[0022] To address such problems, the inventor of the present application has found that by disposing a gas leakage prevention layer for suppressing the permeation of the dissolved gas in the PET film inside the outer packaging material (the direction on the core material side in the thickness direction when the vacuum insulation material is formed) rather than the PET film, it is possible to suppress the increase in the thermal conductivity of the vacuum insulation material, and thus the present invention has been completed.

[0023] Hereinafter, the outer packaging 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.

[0024] A. Outer packaging material for vacuum insulation material The outer packaging material for the vacuum insulation material in the present disclosure has a polyester-based resin layer and a gas leakage prevention layer having a predetermined thickness.

[0025] FIG. 1 is a schematic cross-sectional view showing an example of an outer packaging material for a vacuum insulation material in the present disclosure. As shown in FIG. 1, the outer packaging material 10 for a vacuum insulation material is characterized by having a polyester-based resin layer 1 and a gas leakage prevention layer 2 having a predetermined thickness. As shown in FIG. 1, the outer packaging material 10 for a vacuum insulation material has a laminated film (first laminated film F1), and it is preferable that the laminated film (first laminated film F1) has a polyester-based resin layer 1 and a gas leakage prevention layer 2 disposed on one surface of the polyester-based resin layer 1. That is, it is preferable that the polyester-based resin layer 1 and the gas leakage prevention layer 2 constitute the laminated film (first laminated film F1). Further, the outer packaging material 10 for a vacuum insulation material preferably has a polyester-based resin layer 1, a gas leakage prevention layer 2, and a heat-sealable layer 3 in this order in the thickness direction.

[0026] In FIG. 1, the outer packaging material 10 for a vacuum insulation material has two laminated films (first laminated film F1, second laminated film F2), and each of the first laminated film F1 and the second laminated film F2 has a polyester-based resin layer 1 and a gas leakage prevention layer 2 disposed on one surface of the polyester-based resin layer 1. In each of the first laminated film F1 and the second laminated film F2, the gas leakage prevention layer 2 is disposed on the side of the heat-sealable layer 3 with respect to the polyester-based resin layer 1. Further, an adhesive layer 4 is disposed between the heat-sealable layer 3 and the first laminated film F1, and between the first laminated film F1 and the second laminated film F2.

[0027] The movement of the dissolved gas in the outer packaging material for a vacuum insulation material of the present disclosure during decompression when manufacturing a vacuum insulation material will be described with reference to FIGS. 2(a) and 2(b). FIG. 2(b) is a schematic cross-sectional view for explaining the movement of the dissolved gas within the two-dot chain line frame in FIG. 2(a). Further, the movement of the dissolved gas in the outer packaging material for a vacuum insulation material of the present disclosure after manufacturing a 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).

[0028] The production of the vacuum insulation material is as follows. As shown in Fig. 2(a), two outer packaging materials 10 for the vacuum insulation material are prepared, and the heat-weldable layers thereof are overlapped with each other facing each other. The outer edges of three sides are heat-sealed to obtain a bag body 15 with one side open. After putting the core material 11 into the bag body 15 through the opening 52, it is inserted into the vacuum chamber C, and air is sucked from the 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. 3(a).

[0029] As shown in Fig. 2(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 into the bag body 15 is released from the opening 52 to the outside of the bag body 15. In this state, when the opening 52 is sealed and the vacuum insulation material 50 is formed as shown in Fig. 3(a), in the outer packaging material 10 in the present disclosure, since the gas leakage prevention layer 2 is arranged between the polyester resin layer 1 and the heat-weldable layer 3, that is, since the gas leakage prevention layer 2 is arranged on the inner side (the direction on the core material side in the thickness direction when made into a vacuum insulation material) of the polyester resin layer 1, as shown in Fig. 3(b), the gas leakage prevention layer 2 suppresses the permeation of the dissolved gas G in the polyester resin layer 1, and can suppress the dissolved gas G in the polyester resin layer 1 from entering the inside of the vacuum insulation material 50. Therefore, the deterioration of the internal vacuum degree of the vacuum insulation material is suppressed.

[0030] Conventionally, as shown in Fig. 8, generally, the outer packaging material has a plurality of gas barrier films. Among the plurality of gas barrier films, in the first gas barrier film F11 located on the innermost side (the direction on the core material side in the thickness direction when made into a vacuum insulation material), the gas barrier layer 63 is arranged on the side opposite to the heat-weldable layer 61 with respect to the PET film 62. This is for the heat insulation performance, gas barrier property, and laminate strength as described above.

[0031] On the contrary, in the present disclosure, the gas leakage prevention layer is arranged on the side of the layer that is heat-weldable to the polyester resin layer. By arranging the gas leakage prevention layer in this way, the effects of the present disclosure can be achieved.

[0032] Hereinafter, each component and characteristic of the outer wrapping material for the vacuum insulation material in the present disclosure will be described in detail.

[0033] 1. Gas leakage prevention layer The gas leakage prevention layer in the present disclosure has a predetermined thickness. The thickness of the gas leakage prevention layer is a thickness capable of suppressing the permeation of dissolved gas in the polyester resin layer.

[0034] The gas leakage prevention layer is disposed on one surface of the polyester resin layer. It is preferable that the gas leakage prevention layer is in direct contact with the polyester resin layer. Further, it is preferable that the gas leakage prevention layer and the polyester resin layer constitute a laminated film.

[0035] Examples of the gas leakage prevention layer include an inorganic film and a coating film. The gas leakage prevention layer may have an inorganic film, may have a coating film, or may have both an inorganic film and a coating film.

[0036] (1) Inorganic film Examples of the inorganic film include a metal film and an inorganic compound film.

[0037] (a) Metal film The metal film is a thin film formed of a metal or an alloy. As the metal and alloy used for the metal film, any thin film capable of suppressing the permeation of dissolved gas in the polyester resin layer may be used. For example, metals such as aluminum, stainless steel, titanium, nickel, iron, copper, and alloys containing one or more of the above metals may be mentioned.

[0038] The gas leakage prevention layer may have one metal film or may have two or more metal films. When the gas leakage prevention layer has two or more metal films, metal films having the same composition may be combined, or metal films having different compositions may be combined.

[0039] The metal film may be a vapor deposition film formed by a vapor deposition method, or may be a coating film formed by a coating method such as coating. Among them, a vapor deposition film is preferable because it has high adhesion to the polyester resin layer and can more effectively suppress the permeation of dissolved gas in the polyester resin layer. When the metal film is a vapor deposition film, the film formed by one vapor deposition is regarded as one metal film. For example, when a metal film having the same composition is formed by two vapor depositions, it is assumed that two metals are laminated.

[0040] When the gas barrier layer has a metal film, the thickness of the gas barrier layer is not particularly limited as long as it can suppress the permeation of dissolved gas in the polyester resin layer. In the above case, the thickness of the gas barrier layer is preferably, for example, 50 nm or more, may be 70 nm or more, and may be 100 nm or more. On the other hand, in the above case, the thickness of the gas barrier layer is, for example, 500 nm or less, may be 400 nm or less, and may be 300 nm or less. Specifically, when the gas barrier layer has a metal film, the thickness of the gas barrier layer is 50 nm or more and 500 nm or less, may be 70 nm or more and 400 nm or less, and may be 100 nm or more and 300 nm or less. If the thickness of the gas barrier layer having a metal film is too thin, the permeation of dissolved gas in the polyester resin layer may not be sufficiently suppressed. Also, the strength may not be ensured, and it may deteriorate over time. On the other hand, if the thickness of the gas barrier layer having a metal film is too thick, it may be difficult to form. For example, when the gas barrier layer has only one metal film, the thickness of one metal film may be within the above range. Also, for example, when the gas barrier layer has only two or more metal films, the total thickness of the two or more metal films may be within the above range. At this time, when the metal film is a vapor deposition film, as described above, the film formed by one vapor deposition is regarded as one metal film. Also, for example, when the gas barrier layer has a metal film and a coating film described later, the thickness of the gas barrier layer preferably satisfies the thickness of the gas barrier layer having the coating film described later.

[0041] (b) Inorganic compound film The inorganic compound film is a thin film mainly composed of an inorganic compound. As the inorganic compound used for the inorganic compound film, it is sufficient to obtain a thin film capable of suppressing the permeation of dissolved gas in the polyester resin layer. For example, oxides or nitrides of metal elements or non-metal elements such as silicon, aluminum, titanium, nickel, iron, copper, magnesium, calcium, potassium, tin, sodium, boron, lead, zinc, zirconium, yttrium, etc. are mentioned. Among them, metal oxides are preferred.

[0042] The gas leakage prevention layer may have one inorganic compound film or may have two or more inorganic compound films. When the gas leakage prevention layer has two or more inorganic compound films, inorganic compound films of the same composition may be combined, or inorganic compound films of different compositions may be combined.

[0043] The inorganic compound film may be a vapor deposition film formed by a vapor deposition method or may be a coating film formed by a coating method such as coating. Among them, a vapor deposition film is preferred because it has high adhesion to the polyester resin layer and can more effectively suppress the permeation of dissolved gas in the polyester resin layer. When the inorganic compound film is a vapor deposition film, the film formed by one vapor deposition is regarded as one inorganic compound film. For example, when an inorganic compound film of the same composition is formed by two vapor depositions, it is considered that two inorganic compound films are laminated.

[0044] When the gas leakage prevention layer has an inorganic compound film, the thickness of the gas leakage prevention layer is not particularly limited as long as it can suppress the permeation of dissolved gas in the polyester resin layer. In the above case, the thickness of the gas leakage prevention layer is preferably, for example, 10 nm or more, may be 15 nm or more, and may be 20 nm or more. On the other hand, in the above case, the thickness of the gas leakage prevention layer is, for example, 200 nm or less, may be 150 nm or less, and may be 100 nm or less. Specifically, when the gas leakage prevention layer has an inorganic compound film, the thickness of the gas leakage prevention layer is 10 nm or more and 200 nm or less, may be 15 nm or more and 150 nm or less, and may be 20 nm or more and 100 nm or less. If the thickness of the gas leakage prevention layer having an inorganic compound film is too thin, the permeation of dissolved gas in the polyester resin layer may not be sufficiently suppressed. Also, the strength may not be ensured, and it may deteriorate over time. On the other hand, if the thickness of the gas leakage prevention layer having an inorganic compound film is too thick, it may be difficult to form. In addition, for example, when the gas leakage prevention layer has only one inorganic compound film, the thickness of one inorganic compound film may be within the above range. Also, for example, when the gas leakage prevention layer has only two or more inorganic compound films, the total thickness of the two or more inorganic compound films may be within the above range. At this time, when the inorganic compound film is a vapor deposition film, as described above, the film formed by one vapor deposition is regarded as one inorganic compound film. Also, for example, when the gas leakage prevention layer has an inorganic compound film and the above metal film, the thickness of the gas leakage prevention layer preferably satisfies the thickness of the gas leakage prevention layer having the above metal film. Also, for example, when the gas leakage prevention layer has an inorganic compound film and the coating film described later, the thickness of the gas leakage prevention layer preferably satisfies the thickness of the gas leakage prevention layer having the coating film described later.

[0045] (2) Coating film Examples of the coating film include 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), a film containing a polyvalent metal salt of a polycarboxylic acid-based polymer, and a mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin.

[0046] (a) 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.

[0047] Examples of the above metal oxides include oxides of metals with 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.

[0048] Examples of the above phosphorus compounds include phosphoric acid, polyphosphoric acid, phosphorous acid, phosphonic acid, and their derivatives. Among them, phosphoric acid is preferable. Specific reaction products of metal oxides and phosphorus compounds are the same as, for example, the reaction products disclosed in JP-A-2011-226644.

[0049] 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 or more and 1400 cm -1 or less in the infrared absorption spectrum (measurement wavenumber range). The measurement method of 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 measurement method using a microscopic infrared spectroscopy for the collected sample, etc. can be used. -1 or more and 1130 cm -1 or less.

[0050] (b) Film containing a polyvalent metal salt of a polycarboxylic acid-based polymer A film containing a polyvalent metal salt of a polycarboxylic acid polymer has a cross-linking bond formed by polyvalent metal ions between the carboxyl groups of the polycarboxylic acid polymer. The polyvalent metal salt of the polycarboxylic acid polymer is a reaction product of a polycarboxylic acid polymer and a polyvalent metal compound.

[0051] The presence of the polyvalent metal salt of the polycarboxylic acid polymer is confirmed by the appearance of an absorption peak having an absorption maximum near 1560 cm -1 or more and 1659 cm -1 or less in the infrared absorption spectrum. The above peak is a peak of 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 gives an absorption peak having an absorption maximum near 1560 cm -1 or more and 1659 cm -1 or less in the following infrared light wave number region. 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), etc. -1 or more and 1659 cm -1 or less in the following infrared light wave number region. 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), etc.

[0052] 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 carboxyl groups such as polyacrylic acid, polymethacrylic acid, polymaleic acid, polyitaconic acid, and acrylic acid-methacrylic acid copolymer can be mentioned.

[0053] In addition, the polyvalent metal compound is not particularly limited as long as it can crosslink the carboxyl groups of the polycarboxylic acid-based polymer. For example, metal 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), etc., 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.

[0054] Examples of the polyvalent metal salt of the polycarboxylic acid-based 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.

[0055] 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 selected from these groups can be used as the binder resin.

[0056] A film containing a polyvalent metal salt of a polycarboxylic acid polymer can be formed, for example, by applying a solution for forming a barrier layer in which a carboxylic acid resin, a polyvalent metal compound, and a binder resin are dissolved in a solvent and irradiating with an electron beam. Further, a film containing a polyvalent metal salt of a polycarboxylic acid polymer can be formed by laminating a polycarboxylic acid polymer layer and a polyvalent metal compound-containing layer adjacent to each other and causing an interlayer reaction.

[0057] (c) Mixed compound film containing a metal element, an oxygen element, and a hydrophilic group-containing resin A 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 (However, 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, a film containing 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.

[0058] The sol-gel compound film can have a cross-linking bond C-O-M bond via oxygen between the carbon atom (C) in the hydrophilic group-containing resin and the metal atom (M) in the metal alkoxide.

[0059] The metal alkoxide is represented by 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, or the like. Examples of M include silicon, zirconium, titanium, and aluminum. Further, 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. Also, R2 Examples thereof 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, the (OR 2 ) may be the same or different.

[0060] 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, and the like.

[0061] 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.

[0062] 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).

[0063] 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.

[0064] For other details of the sol-gel compound film, it is the same as the details disclosed in, for example, Japanese Patent No. 5568897 and JP-A-2017-61956.

[0065] (c) Thickness of the coating film When the gas leakage prevention layer has a coating film, the thickness of the gas leakage prevention layer is not particularly limited as long as it can suppress the permeation of dissolved gas in the polyester resin layer. In the above case, the thickness of the gas leakage prevention layer is preferably, for example, 400 nm or more, and may be 450 nm or more, or may be 500 nm or more. On the other hand, in the above case, the thickness of the gas leakage prevention layer is, for example, 1000 nm or less, and may be 900 nm or less, or may be 800 nm or less. Specifically, when the gas leakage prevention layer has a coating film, the thickness of the gas leakage prevention layer is 400 nm or more and 1000 nm or less, and may be 450 nm or more and 900 nm or less, or may be 500 nm or more and 800 nm or less. If the thickness of the gas leakage prevention layer having a coating film is too thin, the permeation of dissolved gas in the polyester resin layer may not be sufficiently suppressed. Also, the strength may not be ensured, and it may deteriorate over time. On the other hand, if the thickness of the gas leakage prevention layer having a coating film is too thick, it may be difficult to form. For example, when the gas leakage prevention layer has only one coating film, the thickness of one coating film may be within the above range. Also, for example, when the gas leakage prevention layer has a coating film and other films, the thickness of the entire gas leakage prevention layer may be within the above range.

[0066] (3) Others The gas leakage prevention layer may have only one layer or may have two or more layers. When the gas leakage prevention layer has two or more layers, layers of the same composition may be combined, or layers of different compositions may be combined.

[0067] The gas leakage prevention layer preferably has two or more inorganic films. It can further suppress the permeation of dissolved gas in the polyester resin layer. Also, if we try to form the required thickness of the gas leakage prevention layer in a single layer, it may be considered that the formation rate will be slow. For example, in the case of physical vapor deposition (PVD), since the amount of heat applied to the polyester resin layer increases, there is a risk that the curl of the polyester resin layer will become stronger. Therefore, it may affect subsequent processes such as the process of laminating a laminated film having a polyester resin layer and a gas leakage prevention layer with a layer that can be heat-sealed. When the gas leakage prevention layer has two or more inorganic films, inorganic films of the same composition may be combined, or inorganic films of different compositions may be combined.

[0068] Also, the gas leakage prevention layer preferably has two or more inorganic films and one or more coating films, and the inorganic films and the coating films are preferably arranged alternately in the thickness direction. Among them, the gas leakage prevention layer preferably has two or more inorganic films and two or more coating films, and the inorganic films and the coating films are preferably arranged alternately in the thickness direction. By arranging the inorganic films and the coating films alternately, the permeation of dissolved gas in the polyester resin layer can be further suppressed. In this case, inorganic films of the same composition may be combined, or inorganic films of different compositions may be combined. Also, coating films of the same composition may be combined, or coating films of different compositions may be combined. For example, in FIG. 4, in the first laminated film F1, the gas leakage prevention layer 2 has, in order from the side of the polyester resin layer 1, an inorganic film 2a, a coating film 2b, an inorganic film 2c, and a coating film 2d.

[0069] As described above, the thickness of the gas barrier layer is such that it can suppress the permeation of dissolved gas in the polyester resin layer. The thickness of the gas barrier layer is appropriately set according to the type and layer configuration of the gas barrier layer. The upper limit of the thickness of the gas barrier layer is, for example, 1000 nm or less, may be 800 nm or less, or may be 600 nm or less. If the thickness of the gas barrier layer is too thick, defects may easily occur when it is subjected to mechanical stress such as bending, or the flexibility may decrease.

[0070] 2. Polyester resin layer The polyester resin layer in the present disclosure contains a polyester resin. Examples of the polyester resin include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT). Among them, polyethylene terephthalate (PET) is preferable. As described above, the PET film is inexpensive, has high mechanical strength, and further has high heat resistance. In addition, the PET film has a high solubility coefficient of gas and contains a large amount of dissolved gases such as nitrogen, oxygen, and carbon dioxide in the PET film, so the present disclosure is useful.

[0071] As the polyester resin layer, a film is preferably used. Therefore, as the polyester resin layer, a PET film is preferably used. When the polyester resin layer 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.

[0072] The polyester resin layer may or may not have transparency.

[0073] The polyester resin layer may contain various plastic compounding agents and additives, etc. Examples of the additives include lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and modifying resins.

[0074] The thickness of the polyester resin layer is not particularly limited, and is, for example, 6 μm or more and 100 μm or less, preferably 9 μm or more and 50 μm or less.

[0075] 3. Laminated Film In the present disclosure, it is preferable that the gas leakage prevention layer and the polyester resin layer constitute a laminated film. In the laminated film, the gas leakage prevention layer is disposed on one surface of the polyester resin layer. As described above, it is preferable that the polyester resin layer and the gas leakage prevention layer are in direct contact with each other.

[0076] In the laminated film, the gas leakage prevention layer is disposed on the inner side (the direction toward the core material side in the thickness direction when used as a vacuum heat insulating material) of the polyester resin layer. The laminated film may further have a gas barrier layer on the surface of the polyester resin layer opposite to the gas leakage prevention layer. Note that the gas barrier layer is the same as the gas barrier layer in the gas barrier film described later.

[0077] In the present disclosure, since the gas leakage prevention layer is disposed on the inner side (the direction toward the core material side in the thickness direction when used as a vacuum heat insulating material) of the polyester resin layer, deterioration of the internal vacuum degree of the vacuum heat insulating material is suppressed. Therefore, it is preferable that no layer containing a large amount of dissolved gas is disposed between the laminated film having the polyester resin layer and the gas leakage prevention layer and the heat-sealable layer. Thus, it is preferable that the laminated film is directly laminated to the heat-sealable layer via an adhesive layer.

[0078] The outer packaging material for the vacuum insulation material in the present disclosure may have one laminated film or two or more laminated films. When the outer packaging material for the vacuum insulation material has two or more laminated films, in all the laminated films, a gas leakage prevention layer is disposed inside the polyester resin layer (the direction that becomes the core material side in the thickness direction when a vacuum insulation material is formed). For example, in FIG. 1, the outer packaging material 10 for the vacuum insulation material has two laminated films (the first laminated film F1 and the second laminated film F2), and in the first laminated film F1 and the second laminated film F2, a gas leakage prevention layer 2 is disposed inside the polyester resin layer 1, respectively. Thereby, it is possible to suppress the dissolved gas in the polyester resin layer from entering the inside of the vacuum insulation material.

[0079] 4. Heat-sealable layer The outer packaging material for the vacuum insulation material in the present disclosure preferably has a heat-sealable layer on one main surface side. The heat-sealable layer is a layer that can be welded by heating. The heat-sealable layer is a member that covers one surface in the thickness direction of the outer packaging material for the vacuum insulation material, contacts the core material when producing a vacuum insulation material using the outer packaging material for the vacuum insulation material in the present disclosure, and is a member that joins the ends of the opposing outer packaging materials for the vacuum insulation material when sealing the core material.

[0080] As the material of the heat-sealable layer, since it can be melted and fused by heating, 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.

[0081] Here, the polyolefin resin has a low solubility coefficient. 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 -3cc / cc·cmHg (literature value). Also, the solubility coefficient of carbon dioxide in a polyethylene film (density 0.9205 g / cm 3 , unoriented) at 24°C is 3.2×10 -3 cc / cc·cmHg (literature value). The above literature values are the values described in "Materials and Moisture Handbook - Hygroscopicity, Moisture Prevention, Humidity Control, Drying -" published by Kyoritsu Shuppan Co., Ltd. in 1968 (pp. 386 - 387). Therefore, since the layer containing the polyolefin - based resin has a small amount of dissolved gas, when used as a vacuum insulation material, the amount of dissolved gas that penetrates into the interior can be reduced, and the deterioration of the internal vacuum degree can be more effectively suppressed.

[0082] The heat - weldable layer may contain additives such as antiblocking agents, lubricants, flame retardants, fillers, etc., if necessary.

[0083] The thickness of the heat - weldable layer may be any thickness that can obtain a desired adhesive force when the outer packages 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.

[0084] 5. Gas - barrier film The outer package for the vacuum insulation material in the present disclosure may have a gas - barrier film on the surface of the polyester - based resin layer side of the laminated film. The gas - barrier film suppresses the intrusion of gases such as oxygen and water vapor from the outside to the inside of the vacuum insulation material as a barrier for gases. Also, even when the resin base material constituting the gas - barrier film contains a large amount of dissolved gas, the gas leakage prevention layer is arranged inside the gas - barrier film, so that the permeation of the dissolved gas into the interior of the vacuum insulation material can be suppressed.

[0085] The outer packaging 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. When the outer packaging material has two or more gas barrier films, it is preferable that all the gas barrier films are arranged on the surface of the polyester resin layer side of the laminated film. Further, when the outer packaging material has two or more of the laminated films, it is preferable that the gas barrier film is arranged outside all the laminated films.

[0086] The gas barrier film has, for example, a resin base material and a gas barrier layer arranged 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 arranged on the layer side capable of heat welding to the resin base material. The gas barrier layer can be protected by the resin base material. Further, when the outer packaging material has two or more gas barrier films, in the gas barrier film located on the outermost side among the two or more gas barrier films, it is preferable that the gas barrier layer is arranged on the layer side capable of heat welding to the resin base material. The gas barrier layer can be protected by the resin base material.

[0087] For example, in FIG. 5, a gas barrier film F3 is arranged on the surface of the polyester resin layer 1 side of the laminated film F1. The gas barrier film F3 has a resin base material 5 and a gas barrier layer 6 arranged on one surface of the resin base material 5, and the gas barrier layer 6 is arranged on the layer 3 side capable of heat welding to the resin base material 5.

[0088] (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.

[0089] The resin substrate may or may not have transparency. Examples of the material of the resin substrate include 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.

[0090] The resin substrate may contain various plastic compounding agents and additives. Examples of the additives include lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and modifying resins.

[0091] The thickness of the resin substrate is not particularly limited, and is, for example, 6 μm or more and 200 μm or less, preferably 9 μm or more and 100 μm or less.

[0092] (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.

[0093] The inorganic film and the coating film are the same as the inorganic film and the coating film in the gas leakage prevention layer described above, respectively.

[0094] 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.

[0095] The gas barrier layer may have one layer or two or more layers. When the gas barrier layer has two or more layers, layers having the same composition may be combined, or layers having different compositions may be combined. When the gas barrier layer has two or more layers, the two or more layers are regarded as one gas barrier layer as a whole. For example, the gas barrier layer may have an inorganic film and a coating film in order from the resin base material side.

[0096] The thickness of the gas barrier layer is not particularly limited as long as it can exhibit the desired gas barrier property, and is 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. 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. If the thickness of the gas barrier layer is too thin, the desired gas barrier property may not be exhibited. Also, the strength may not be ensured and deterioration over time may occur. On the other hand, if the thickness of the gas barrier layer is too thick, defects are likely to occur when mechanical stress such as bending is applied, or the flexibility may decrease.

[0097] (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 for the gas barrier film include foils of aluminum, nickel, stainless steel, iron, copper, and titanium. The metal foil has good gas barrier properties and excellent flex 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 other layers may be laminated on the metal foil.

[0098] The thickness of the gas barrier film having a metal foil is not particularly limited, and for example, it may be 4 μm or more and 9 μm or less, or may be 5 μm or more and 7 μm or less.

[0099] 6. Adhesive layer In the outer packaging material for the vacuum insulation 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.

[0100] Examples of the adhesive used for the adhesive layer include pressure-sensitive adhesives, thermoplastic adhesives, curable adhesives, etc. 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.

[0101] Specifically, as the adhesive, epoxy adhesives, polyvinyl acetate adhesives, polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol 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.

[0102] Among them, polyacrylate adhesives and polyurethane adhesives are preferred as the adhesive. 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.

[0103] 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.

[0104] The thickness of the adhesive layer may be any thickness that can exhibit the desired adhesive strength, and is appropriately set according to the composition of the adhesive layer and the like. 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.

[0105] 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.

[0106] 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.

[0107] 7. Protective Film In the outer wrapping material 10 for a vacuum insulation material in the present disclosure, for example, as shown in FIG. 6, a protective film 7 may be disposed on the main surface side opposite to the heat-sealable layer 3. The protective film is a member that is disposed on the surface opposite to the heat-sealable layer of the laminated film and protects the laminated film. Further, when the outer wrapping material for a vacuum insulation material has a gas barrier film on the surface of the polyester resin layer side of the laminated film, the protective film also protects the gas barrier film. Note that the protective film is distinguished from the laminated film and the gas barrier film in that no gas escape prevention layer or gas barrier layer is disposed on either surface.

[0108] 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.

[0109] 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.

[0110] 8. Characteristics The outer wrapping material for a vacuum insulation material in the present disclosure preferably has gas barrier properties.

[0111] In the outer packaging material for the vacuum insulation material in the present disclosure, the 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.

[0112] The water vapor permeability is measured using a water vapor permeability measuring device in accordance with ISO 15106-5:2015 (differential pressure method) under the conditions of a temperature of 40°C and a relative humidity difference of 90%RH. First, a sample of the outer packaging material for the vacuum insulation material cut to a desired size is mounted between the upper chamber and the lower chamber of the above device such that the outermost surface layer located on the side opposite to the heat-sealable layer, which is one of the outermost surfaces facing in the thickness direction, becomes the high-humidity side (water vapor supply side), and the measurement is carried out under the conditions of a temperature of 40°C and a relative humidity difference of 90%RH with a permeation area of about 50 cm 2 (permeation region: a circle with a diameter of 8 cm). As the water vapor permeability measuring device, for example, "DELTAPERM" manufactured by Technolox, UK is used. The measurement of the water vapor permeability is carried out for 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.

[0113] Also, in the outer packaging material for the vacuum insulation material in the present disclosure, the oxygen permeability is, for example, preferably 0.5 cc / (m 2 ·day·atm) or less, and more preferably 0.1 cc / (m 2 ·day·atm) or less.

[0114] 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 with 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, in contact with oxygen gas, and installed in the above device, with a permeation area of about 50 cm 2 (Permeation area: a circle with a diameter of 8 cm), and the measurement is carried out with 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, a carrier gas is supplied 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, a test gas is flowed into the above device, and the measurement is carried out 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 carried out for 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.

[0115] 9. Others The outer packaging material for the vacuum insulation material in the present disclosure may or may not have transparency, and is 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. The transparency of the above outer packaging material for the vacuum insulation material is not defined by a strict transmittance and is appropriately determined according to the use and the like.

[0116] When the outer packaging material for the vacuum insulation material in the present disclosure has transparency, the vacuum insulation material using the above outer packaging material for the vacuum insulation material enables visual recognition of its interior. Therefore, by putting a detector together with the core material inside the vacuum insulation material, it becomes possible to visually confirm the internal vacuum state from the change in the detector.

[0117] As a method for manufacturing an outer packaging material for a vacuum insulating material in the present disclosure, for example, a method of bonding each previously manufactured film via the above-described adhesive layer can be mentioned. Further, the outer packaging material for a vacuum insulating material in the present disclosure may be manufactured by sequentially extruding and laminating the raw materials of each heat-melted film using a T-die or the like.

[0118] The outer packaging material for a vacuum insulating material in the present disclosure can be used for a vacuum insulating material. In the vacuum insulating material, the outer packaging material for a vacuum insulating material in the present disclosure can be disposed opposite to each other via a core material such that the heat-weldable layer faces the core material side.

[0119] B. Vacuum Insulating Material The vacuum insulating material in the present disclosure is a vacuum insulating material having a core material and an outer packaging material that encloses the core material, and the outer packaging material is the above-described outer packaging material for a vacuum insulating material.

[0120] FIG. 7(a) is a schematic perspective view showing an example of the vacuum insulating material in the present disclosure, and FIG. 7(b) is a cross-sectional view taken along the line X-X of FIG. 7(a). The vacuum insulating material 50 illustrated in FIG. 7 has a core material 11 and an outer packaging material 10 that encloses the core material 11, and the outer packaging material 10 is the outer packaging material for a vacuum insulating material described with reference to FIG. 1. The vacuum insulating material 50 is a bag body in which two outer packaging materials 10 face each other such that their respective heat-weldable layers face each other, and the ends 12 are joined by heat welding. The core material 11 is enclosed in the bag body, and the inside of the bag body is depressurized.

[0121] According to the present disclosure, since the outer packaging material that encloses the core material is the above-described outer packaging material for a vacuum insulating material, a vacuum insulating material capable of maintaining good heat insulation performance can be obtained.

[0122] Hereinafter, the vacuum insulating material in the present disclosure will be described for each component.

[0123] 1. Outer Packaging Material for Vacuum Insulating Material The outer packaging material for a vacuum insulating material in the present disclosure is a member that encloses the core material, and since it is the same as the outer packaging material for a vacuum insulating material described in the section of "A. Outer Packaging Material for Vacuum Insulating Material" above, the description here is omitted.

[0124] 2. Core material The core material in the present disclosure is a member enclosed by an outer wrapping material for a vacuum insulation material. Note that being enclosed means being sealed inside a bag formed using the outer wrapping material for a vacuum insulation material.

[0125] The core material preferably has a low thermal conductivity. Also, the core material can be a porous material having a porosity of 50% or more, particularly 90% or more.

[0126] As the material constituting the core material, powders, foams, fibrous bodies, etc. can be used. The above 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 the internal pressure rises because the decrease in heat insulation performance due to the increase in the 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 materials as a radiation suppression material, the infrared absorption rate of the core material can be reduced.

[0127] As the above foam, urethane foam, styrene foam, phenol foam, etc. can be used. Among them, a foam that forms continuous bubbles is preferable.

[0128] The above fibrous body 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.

[0129] The core material may be used alone with the materials described above, or may be a composite material in which two or more materials are mixed.

[0130] 3. Others The vacuum insulation material in the present disclosure has a core material encapsulated inside an outer wrapping 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.

[0131] The lower the thermal conductivity of the vacuum insulation material, the more preferable it is. For example, the thermal conductivity (initial thermal conductivity) is preferably 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 these, the above-mentioned initial thermal conductivity is more preferably 4 mW / (m·K) or less. The thermal conductivity is a 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.

[0132] Also, in the vacuum insulation material in 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.

[0133] As for 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-sealable layers facing each other are overlapped, 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 depressurized, thereby obtaining a vacuum insulation material.

[0134] 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.

[0135] C. Article with Vacuum Insulation Material The article with a vacuum insulation material in the present disclosure is an article with a heat insulation region and a vacuum insulation material, and the above-mentioned vacuum insulation material has a core material and an outer wrapping material in which the core material is encapsulated, and the above-mentioned outer wrapping material is the above-mentioned outer wrapping material for the vacuum insulation material.

[0136] According to the present disclosure, since the vacuum insulation material used for an article has the above-described outer packaging material for a vacuum insulation material, the vacuum insulation material can exhibit good heat insulation performance. By providing such a vacuum insulation material in the article, it is possible to achieve energy saving for the article in a high-temperature environment or a high-temperature and high-humidity environment, or for the object to which the article is applied.

[0137] The vacuum insulation material and the outer packaging material for a vacuum insulation material used therefor in the present disclosure have been described in detail in the above-mentioned sections of "B. Vacuum Insulation Material" and "A. Outer Packaging Material for Vacuum Insulation Material", and thus the description here is omitted.

[0138] The article in the present disclosure has a heat insulation region. Here, the heat insulation region is a region thermally insulated by a vacuum insulation material, and for example, it is a region that is heat-insulated or cold-insulated, a region surrounding a heat source or a cooling source, or a region isolated from a heat source or a cooling source. These regions may be a space or an object.

[0139] Examples of the above article include electric 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.

[0140] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are examples, and any configuration that has substantially the same configuration 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.

[0141] In the present disclosure, for example, the following inventions are provided. [1] An outer packaging material for a vacuum insulation material, comprising a polyester-based resin layer and a gas leakage prevention layer having a predetermined thickness. [2] The outer packaging material for a vacuum insulation material according to [1], wherein the gas leakage prevention layer has an inorganic film, the inorganic film has an inorganic compound film, and the thickness of the gas leakage prevention layer is 10 nm or more. [3] The outer wrapping material for a vacuum heat insulating material according to [1] or [2], wherein the gas leakage prevention layer has an inorganic film, the inorganic film has a metal film, and the thickness of the gas leakage prevention layer is 50 nm or more. [4] The outer wrapping material for a vacuum heat insulating material according to any one of [1] to [3], wherein the gas leakage prevention layer has a coating film, and the thickness of the gas leakage prevention layer is 400 nm or more. [5] The outer wrapping material for a vacuum heat insulating material according to any one of [1] to [4], wherein the gas leakage prevention layer has two or more layers. [6] The outer wrapping material for a vacuum heat insulating material according to [5], wherein the gas leakage prevention layer has two or more inorganic films. [7] The outer wrapping material for a vacuum heat insulating material according to [6], wherein the gas leakage prevention layer has two or more coating films, and the inorganic film and the coating film are alternately arranged. [8] The outer wrapping material for a vacuum heat insulating material according to any one of [1] to [7], wherein the polyester resin layer is a polyethylene terephthalate film. [9] The outer wrapping material for a vacuum heat insulating material according to any one of [1] to [8], having a heat weldable layer on the surface of the gas leakage prevention layer opposite to the polyester resin layer.

[10] The outer wrapping material for a vacuum heat insulating material according to any one of [1] to [9], wherein the outer wrapping material for a vacuum heat insulating material has a laminated film, and the laminated film has the polyester resin layer and the gas leakage prevention layer disposed on one surface of the polyester resin layer.

[11] The outer wrapping material for a vacuum heat insulating material according to

[10] , having two or more of the laminated films.

[12] The outer wrapping material for a vacuum heat insulating material according to

[10] or

[11] , having a gas barrier film on the surface of the laminated film on the polyester resin layer side.

[13] A vacuum heat insulating material having a core material and an outer wrapping material in which the core material is enclosed, wherein the outer wrapping material is the outer wrapping material for a vacuum heat insulating material according to any one of [1] to

[12] .

[14] An article having a heat insulation region and an article with a vacuum heat insulating material including the vacuum heat insulating material, The above-mentioned vacuum insulation material has a core material and an outer wrapping material in which the core material is encapsulated. An article with a vacuum insulation material, wherein 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... Polyester resin layer 2... Gas leakage prevention layer 3... Heat-sealable layer 4... Adhesive layer 5... Resin substrate 6... Gas barrier layer 7... Protective film 10... Outer wrapping material for vacuum insulation material 11... Core material 50... Vacuum insulation material F1... First laminated film F2... Second laminated film

Claims

1. An outer package material for a vacuum heat insulating material, comprising a polyester resin layer and a gas leakage prevention layer having a predetermined thickness.

2. The outer package material for a vacuum heat insulating material according to claim 1, wherein the gas leakage prevention layer has an inorganic film, the inorganic film has an inorganic compound film, and the thickness of the gas leakage prevention layer is 10 nm or more.

3. The outer package material for a vacuum heat insulating material according to claim 1, wherein the gas leakage prevention layer has an inorganic film, the inorganic film has a metal film, and the thickness of the gas leakage prevention layer is 50 nm or more.

4. The outer package material for a vacuum heat insulating material according to claim 1, wherein the gas leakage prevention layer has a coating film, and the thickness of the gas leakage prevention layer is 400 nm or more.

5. The outer package material for a vacuum heat insulating material according to claim 1, wherein the gas leakage prevention layer has two or more layers.

6. The outer package material for a vacuum heat insulating material according to claim 5, wherein the gas leakage prevention layer has two or more inorganic films.

7. The outer package material for a vacuum heat insulating material according to claim 6, wherein the gas leakage prevention layer has two or more coating films, and the inorganic film and the coating film are alternately arranged.

8. The outer package material for a vacuum heat insulating material according to claim 1, wherein the polyester resin layer is a polyethylene terephthalate film.

9. The outer package material for a vacuum heat insulating material according to claim 1, having a heat weldable layer on the surface of the gas leakage prevention layer opposite to the polyester resin layer.

10. The outer package material for a vacuum heat insulating material according to claim 1, wherein the outer package material for a vacuum heat insulating material has a laminated film, and the laminated film has the polyester resin layer and the gas leakage prevention layer disposed on one surface of the polyester resin layer.

11. The outer packaging material for a vacuum insulation material according to claim 10, having two or more of the laminated films.

12. The outer packaging material for a vacuum insulation material according to claim 10, having a gas barrier film on the surface of the laminated film on the polyester resin layer side.

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

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