JP2014035011A - Laminate for vacuum heat insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate for vacuum heat insulation material which has no defective quality such as defective appearance due to "heat shrinkage wrinkle" and "slack" and defective oxygen gas barrier property, and has a new constitution excellent in heat insulation performance, and to provide a vacuum heat insulation material using the laminate for vacuum heat insulation material.SOLUTION: A laminate 1 for vacuum heat insulation material which is used for vacuum heat insulation material made by enclosing heat insulation core material with jacketing wrapping material made of a laminated body and degassing an internal part enclosed by the jacketing wrapping material to make a vacuum state is produced by configuring at least a substrate layer 11, an adhesive layer 10, an oxygen gas barrier layer 12 made of biaxially stretched polyester film which has a vapor deposition layer of an inorganic substance or a metal oxide, on one-side surface, an adhesive layer 10 and a heat-adhesive resin layer 13, in this order. Therein, the adhesive layer 10 on the side contacting with the vapor deposition layer is formed with an adhesive which has a coating amount of 4 g/m. dry thickness and has oxygen gas barrier performance when being measured in measurement conditions of 23°C60%RH, of 90 ml/m.day.MPa or less.

Description

  The present invention relates to a laminate for a vacuum heat insulating material and a vacuum heat insulating material using the same, and more specifically, heat insulation used for a refrigerator, a heat storage, a water heater, a vending machine, a transport container, a system bath, a housing wall, and the like. The present invention relates to a laminate for a vacuum heat insulating material used for a wall or a heat insulating wall used around a heating element such as a car, an airplane, a ship, a train, and an OA device, and a vacuum heat insulating material used therefor.

  Conventionally, vacuum heat insulating materials have been used as heat insulating layers in refrigerators, water heaters, vending machines, and the like. Such a vacuum heat insulating material is usually packaged in a sealed state by encapsulating a heat insulating core material in the outer covering material, degassing the inside of the outer covering material and thermally bonding in a vacuum state. Yes.

  In order to maintain the heat insulating performance of the vacuum heat insulating material for a long period of time, it is necessary to maintain the inside of the outer covering material in a vacuum state for a long period of time. Therefore, the laminated body for vacuum heat insulating material used for the envelope material has excellent gas barrier property for preventing gas from permeating from the outside, and heat bonding for covering and sealing the heat insulating core material. Various functions such as sex are required. Therefore, the laminate for a vacuum heat insulating material is usually configured as a laminate in which a plurality of films having these various functions are laminated.

  Specifically, an outermost layer composed of a biaxially oriented polypropylene layer or a polyamide layer, a second layer composed of a polyethylene terephthalate resin layer deposited with aluminum, an ethylene vinyl alcohol copolymer film layer deposited with aluminum, a linear low density An outer packaging material in which a welding layer made of a polyethylene resin layer or a high-density polyethylene resin layer is sequentially laminated is used (for example, see Patent Document 1).

  The technique disclosed in Patent Document 1 can be used as an outer packaging material that can improve heat insulation performance, and can provide a vacuum heat insulating material that ensures reliability. The vinyl alcohol copolymer film layer is subject to heat shrinkage and sagging due to heat shrinkage of the ethylene vinyl alcohol copolymer film during aluminum deposition, and problems caused by this. In the laminating process when making the outer packaging material, the “heat shrinkage wrinkles” remain wrinkle marks and the “sagging” becomes broken wrinkles, both of which have poor appearance such as poor appearance and oxygen gas barrier property. In addition, there is a problem that it is necessary to remove defective parts, which deteriorates productivity and further increases costs as a result of these various problems. Another problem is that an ethylene vinyl alcohol copolymer film layer on which aluminum is deposited is present. Therefore, in order to maximize the gas barrier performance of the ethylene vinyl alcohol copolymer film layer, ethylene vinyl alcohol is used. From the need to keep the relative humidity of the copolymer film layer low, it is necessary to suppress the permeation of water vapor gas from the external environment, between the outermost layer and the ethylene vinyl alcohol copolymer film layer on which aluminum is deposited, A second layer made of a polyethylene terephthalate resin layer deposited with aluminum must be used as a necessary evil. As a result, there is a problem that the cost increases, and these solutions have been desired.

JP 2012-47210 A

  Therefore, the present invention is free from quality defects such as appearance defects and oxygen gas barrier properties due to “heat shrinkage wrinkles” and “sagging”, and has a structure having an ethylene vinyl alcohol copolymer film layer on which aluminum is deposited, and heat insulation performance comparable to It is providing the laminated body for vacuum heat insulating materials of the new structure which has these, and a vacuum heat insulating material using the same.

In order to achieve the above-mentioned object, the inventor of the present invention described in claim 1 encloses a heat insulating core material with an outer envelope material made of a laminate, and removes the interior enclosed with the outer envelope material. In a laminate for vacuum heat insulation used for a vacuum heat insulating material that is in a vacuum state by gas, at least a base material layer, an adhesive layer, an oxygen gas barrier layer, an adhesive layer, and a thermal adhesive resin layer are configured in this order, and the oxygen The gas barrier layer is made of a biaxially stretched polyester film having an inorganic or metal oxide vapor-deposited layer on one surface, and the adhesive layer on the side in contact with the vapor-deposited layer has a coating amount of 4 g / m ² · dry thickness or more. In addition, it is formed of an adhesive having an application amount of 4 g / m ² · dry thickness and an oxygen gas barrier performance of 90 ml / m ² · day · MPa or less when measured at a measurement temperature of 23 ° C. and 60% RH. Also characterized by It is. The oxygen gas barrier performance (oxygen gas permeability) is obtained by applying and drying an adhesive to a 20 μm-thick biaxially stretched polypropylene film (hereinafter referred to as OPP20) to 4 g / m ² · dry. An unstretched polypropylene film (hereinafter referred to as CPP40) having a thickness of 40 μm is laminated on the adhesive surface to form a laminate. After heat drying at 40 ° C. for 2 days, the laminate is used at 23 ° C. and 60% RH. It is a numerical value calculated by subtracting the oxygen gas permeability of each of OPP20 and CPP40 measured in the same manner while measuring with OX-TRAN MODEL 2/21 manufactured by MOCON under the measurement conditions described above.

  Further, in the vacuum heat insulating material of the present invention described in claim 2, the heat insulating core material is enclosed in the outer cover material using the laminate for vacuum heat insulating material described in claim 1, and the inside of the outer cover material is It is degassed and sealed and packaged in a vacuum state.

  According to the present invention, it is possible to eliminate quality defects such as poor appearance and oxygen gas barrier property caused by using an ethylene vinyl alcohol copolymer film deposited with aluminum in a conventional laminate for vacuum heat insulating material, In the heat insulation performance, there is an effect that it is possible to provide a laminated body for vacuum heat insulating material having performance comparable to that of a conventional laminated body for vacuum heat insulating material and a vacuum heat insulating material using the same.

It is a figure which shows the layer structure of one Example of the laminated body for vacuum heat insulating materials concerning this invention schematically. It is sectional drawing which shows schematically one Example of the vacuum heat insulating material concerning this invention.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a diagram schematically showing a layer configuration of one embodiment of a laminate for a vacuum heat insulating material according to the present invention, and FIG. 2 is a cross-sectional view schematically showing one embodiment of a vacuum heat insulating material according to the present invention. In the figure, 1 is a laminate for a vacuum heat insulating material, 1 ′ is an outer covering material, 2 is a vacuum heat insulating material, 11 is a base material layer, 12 is an oxygen gas barrier layer, 13 is a heat-adhesive resin layer, and 20 is heat insulating material. A core material and A each indicate a thermal bonding portion.

  FIG. 1 is a diagram schematically showing a layer structure of one embodiment of a laminate for a vacuum heat insulating material according to the present invention. The laminate for a vacuum heat insulating material 1 includes a base material layer 11, an adhesive layer 10, an oxygen gas barrier layer. 12, the adhesive layer 10, and the thermoadhesive resin layer 13 are laminated | stacked in order.

    First, the base material layer 11 will be described. Since the base material layer 11 is a basic material constituting a laminate for a vacuum heat insulating material, a plastic film made of a synthetic resin having excellent properties in mechanical, physical, chemical and the like can be used. For example, a film made of a resin such as polyester, polyamide, polypropylene, polycarbonate, or polyacetal can be used. As these plastic films, any of an unstretched film or a stretched film stretched in a uniaxial direction or a biaxial direction can be used, but a biaxially stretched film is preferable in terms of mechanical and physical superiority. . The thickness of the base material layer 11 is suitably 9 to 30 μm.

  In FIG. 1, the base material layer 11 is an outer layer so as to be positioned on one outer surface of the laminate 1 for vacuum heat insulating material, and is shown as a single layer configuration. The base material layer 11 may be further interposed between the oxygen gas barrier layer and the thermal adhesive resin layer 14 as necessary.

  Next, the oxygen gas barrier layer 12 will be described. As the oxygen gas barrier layer 12, in the present invention, an inorganic substance typified by silicon oxide or a metal oxide typified by aluminum oxide is used on one side rather than a plastic film in which a metal typified by aluminum is deposited on one side. A plastic film deposited on is suitable. The reason for this is that there is little deterioration over time, there are few cracks even when bent, and when the laminate for vacuum heat insulating material is used as the outer covering material of the vacuum heat insulating material, the heat through the outer covering material is reduced. It is because there is little conductivity and sufficient heat insulation performance is obtained.

  In addition, the plastic film constituting the oxygen gas barrier layer 12 is excellent in processability for imparting oxygen gas barrier properties and can be well maintained without impairing the oxygen gas barrier properties. It is required to be excellent in various physical properties such as processability and heat resistance at the time of bag making as an outer packaging material, and any material that satisfies these requirements may be used. For example, the base material layer 11 described above Among them, polyester-based, polyamide-based, and polypropylene-based plastic films are particularly preferable, and the thickness is suitably 9 to 30 μm.

  Next, the thermal adhesive resin layer 13 will be described. The heat-adhesive resin layer 13 may be any thermoplastic resin that can be melted by heat and fused to each other. For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear ( Linear) low-density polyethylene, ethylene-vinyl acetate copolymer, acid copolymer of ethylene and acrylic acid, ester copolymer of ethylene and acrylic acid ester, etc., polypropylene, ethylene-propylene copolymer, A methylpentene polymer or the like can be used. The thickness of the adhesive resin layer 14 may be 10 μm or more, and may be determined in consideration of required physical properties and costs.

  As described above, the oxygen gas barrier layer 12 is made of a plastic film having a vapor deposition layer formed on one surface, but the position of the vapor deposition layer of the oxygen gas barrier layer 12 in the laminate 1 for vacuum heat insulating material. Is preferably located far from the heat-adhesive resin layer 13, that is, the vapor deposition layer is located on the substrate layer 11 side. The reason for this is that when the vapor-deposited layer is positioned on the thermal adhesive resin layer 13 side, the vacuum heat insulating material laminate is used when the vacuum heat insulating material 2 described later is used, compared to the case where the deposited layer is positioned on the base material layer 11 side. Although the bodies 1 are thermally bonded to each other, the heat-adhesive resin layer 13 undergoes a process of melting and solidifying (expanding and shrinking) during this processing, and in this process, the vapor deposition layer may crack. This is because the sex is higher.

Next, the adhesive layer 10 will be described. As the adhesive layer 10, the adhesive layer on the side where the vapor deposition layer of the oxygen gas barrier layer 12 is located, and in FIG. 1, the adhesive layer 10 (the base material layer 11 and the oxygen gas barrier layer 12 on the base material layer 11 side). The adhesive layer 10) is formed at a coating amount of 4 g / m ² · dry thickness or more, and the coating amount is 4 g / m ² · dry thickness and the measurement condition is 23 ° C. and 60% RH It is formed with an adhesive having an oxygen gas permeability of 90 ml / m ² · day · MPa or less (hereinafter referred to as an adhesive excellent in oxygen gas barrier performance) as measured by (1).

  An adhesive having excellent oxygen gas barrier performance for forming the adhesive layer 10 is disclosed in Japanese Patent Application Laid-Open No. 2003-300201 and Japanese Patent Application Laid-Open No. 2010-012769. A non-bisphenol A-based polyepoxy resin is used as a main agent and a polyamine resin is cured. It is an adhesive used as an agent, and “MAXIVE (registered trademark)” marketed as a gas barrier adhesive by Mitsubishi Gas Chemical Co., Ltd. can be suitably used, and is laminated by a well-known dry lamination method. The gas barrier adhesive “MAXIVE (registered trademark)” provides the barrier performance as an adhesive, and also has the effect of preventing the gas barrier performance from being deteriorated by preventing the deposition layer from cracking due to bending.

  By forming the adhesive layer 10 (the adhesive layer 10 between the base material layer 11 and the oxygen gas barrier layer 12) in contact with the vapor deposition layer in FIG. 1 with a gas barrier adhesive, the required gas barrier performance, and consequently When the gas barrier performance is required, the adhesive layer 10 between the oxygen gas barrier layer 12 and the thermal adhesive resin layer 13 in FIG. Similarly to the adhesive layer 10 between the material layer 11 and the oxygen gas barrier layer 12, the gas barrier adhesive “MAXIVE (registered trademark)” described above may be used.

  In general, the adhesive layer 10 between the oxygen gas barrier layer 12 and the thermal adhesive resin layer 13 is a well-known dry lamination using a urethane two-component curable adhesive composed of polyester polyol and isocyanate. It may be laminated by a method such as a sandwich lamination method through an adhesive layer made of melt-extruded resin. In any of the lamination methods, the necessary surface is subjected to corona discharge treatment, plasma treatment, anchor agent coating treatment, etc., or any easy adhesion treatment as necessary, and the adhesion strength between the layers. It is natural to secure this.

  Further, although not shown, in order to further improve the oxygen gas barrier performance, or between the base material layer 11 and the oxygen gas barrier layer 12 of the laminate 1 for vacuum heat insulating material shown in FIG. A plastic film in which a metal typified by aluminum is vapor-deposited between the layer 12 and the heat-adhesive resin layer 13; a plastic film in which an inorganic material typified by silicon oxide or a metal oxide typified by aluminum oxide is vapor-deposited; Alternatively, a plastic film coated with an oxygen gas barrier composition typified by polyvinyl alcohol or polyvinylidene chloride, or a polyvinylidene chloride film, an ethylene-vinyl alcohol copolymer film (EVOH), an MXD nylon film [Toyobo Co., Ltd. )], Or has an aluminum deposition layer on one side A film having an oxygen gas barrier performance such as a biaxially stretched three-layer coextruded film (polyamide layer having a thickness of 5.5 μm / EVOH layer having a thickness of 4.0 μm / polyamide layer having a thickness of 5.5 μm) may be used. As the plastic film, the same plastic film as described for the oxygen gas barrier layer 12 can be used, and the description thereof is omitted.

  FIG. 2 is a cross-sectional view schematically showing an embodiment of the vacuum heat insulating material according to the present invention. The vacuum heat insulating material 2 is heat-insulated in the envelope material 1 ′ using the laminate 1 for vacuum heat insulating material. The core material 20 is enclosed, and the inside of the outer covering material 1 ′ is deaerated to be in a vacuum state. The said vacuum heat insulating material 2 can be manufactured as follows, for example. That is, a pair of rectangular laminates for vacuum heat insulating material 1 are stacked with the heat-adhesive resin layer 13 facing each other and thermally bonded to form a heat-bonding portion A on three peripheral edges, and an opening is formed on one side. The outer covering material 1 ′ is made in a bag, and after the heat insulating core material 20 is received from the opening of the outer covering material 1 ′, the inside of the outer covering material 1 ′ is evacuated to a vacuum state, By thermally bonding the opening in the state, the vacuum heat insulating material 2 made of a four-side seal type packaging bag can be obtained. The form of the packaging bag is not limited to the four-side seal type, but is a three-side seal type, and can be an appropriate form such as a gusset type or a pillow type.

  As the heat insulating core material 20, an inorganic material such as silica, pearlite, calcium silicate, or an organic material such as polyurethane foam is used. Further, examples of the form of the heat insulating core material 20 include fine powder, porous material, and fibrous material.

  The inside of the vacuum heat insulating material 2 is normally in a vacuum state of 5 Pa or less, and is configured so that heat conduction by convection is minimized. If the degree of vacuum is higher than 5 Pa, the air remaining inside convects and the heat insulation performance deteriorates, which is not preferable.

Hereinafter, the present invention will be described in more detail with reference to examples.
[Example 1]
A two-part curable gas barrier adhesive “Mitsubishi Gas Chemical Co., Ltd .: MAXIVE” (registered trademark) consisting of a main agent and a curing agent on the corona discharge treated surface of a 25 μm thick biaxially stretched polyamide film (hereinafter abbreviated as ON25) ”(4 g / m ² dry), one side of a 12 μm thick biaxially stretched polyethylene terephthalate film (hereinafter abbreviated as PET12) having a silicon oxide vapor deposition layer on one side is laminated, and then the PET12 A laminate of the present invention is obtained by laminating a corona discharge-treated surface of a 50 μm-thick linear low-density polyethylene film (hereinafter abbreviated as LLDPE50) with an adhesive on the other surface (corona discharge-treated surface). It was.
Laminate structure: ON25 / gas barrier adhesive / silicon oxide deposited layer / PET12 / adhesive / LLDPE50

[Example 2]
A biaxially stretched polyethylene terephthalate film (hereinafter abbreviated as PET12) having an aluminum vapor deposition layer on one surface via an adhesive on a corona discharge treated surface of a 25 μm thick biaxially stretched polyamide film (hereinafter abbreviated as ON25) One side is laminated, and then the other side (corona discharge treatment side) of PET 12 having the aluminum vapor deposition layer is placed on one side via a gas barrier adhesive “MAXIVE (registered trademark)” (4 g / m ² dry). One surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter abbreviated as PET12) having a silicon oxide vapor deposition layer on the surface is laminated, and then the other surface of the PET12 having the silicon oxide vapor deposition layer (corona discharge) Corona release of 30 μm-thick unstretched polypropylene film (hereinafter abbreviated as CPP30) via an adhesive on the treated surface) By laminating treated surface to obtain a laminate of the present invention.
Laminate structure: ON25 / adhesive / aluminum deposited layer / PET12 / gas barrier adhesive / silicon oxide deposited layer / PET12 / adhesive / CPP30

Example 3
Silicon oxide is deposited on one surface of a 20 μm-thick biaxially stretched polypropylene film (hereinafter abbreviated as OPP20) via a gas barrier adhesive “MAXIVE®” (4 g / m ² dry) on the corona discharge treated surface. Laminate one side of a 12 μm thick biaxially stretched polyethylene terephthalate film (hereinafter abbreviated as PET12) having a layer, and then adhere to the other side (corona discharge treated surface) of PET12 having the silicon oxide vapor deposition layer 15 μm-thick biaxially stretched three-layer coextruded film (5.5 μm-thick polyamide layer / 4.0 μm-thick EVOH layer / 5.5 μm-thick) Of the aluminum layer) (hereinafter abbreviated as ON5.5 // EVOH4.0 // ON5.5), and then the three-layer coextrusion film is laminated. A laminate of the present invention is obtained by laminating the corona discharge treated surface of an unstretched high-density polyethylene film (hereinafter abbreviated as HDPE50) having a thickness of 50 μm on the other surface (corona discharge treated surface) of the film with an adhesive. It was.
Laminate structure: OPP20 / gas barrier adhesive / silicon oxide vapor deposition layer / PET12 / adhesive / aluminum vapor deposition layer / ON5.5 // EVOH4.0 // ON5.5 / adhesive / HDPE50
(// indication indicates the laminated part by coextrusion method)

[Comparative Example 1]
A 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET12) having an aluminum deposited layer on one surface of the corona discharge treated surface of a 25 μm thick biaxially stretched polyamide film (hereinafter referred to as ON25) via an adhesive. The other surface (corona discharge treatment surface) is laminated, and then 12 μm-thick ethylene having an aluminum vapor deposition layer on one surface of the PET 12 with an adhesive on one surface (aluminum vapor deposition layer surface). -One surface (aluminum vapor deposition layer surface) of a vinyl alcohol copolymer film (hereinafter abbreviated as EVOH12) is laminated, and then the other surface of the EVOH12 is a linear low density of 50 μm thickness via an adhesive. A corona discharge treated surface of a polyethylene film (hereinafter abbreviated as LLDPE50) was laminated to obtain a laminate as a comparative example.
Laminate structure: ON25 / adhesive / PET12 / aluminum vapor deposition layer / adhesive / aluminum vapor deposition layer / EVOH12 / adhesive / LLDPE50

[Comparative Example 2]
A biaxially stretched polyethylene terephthalate film (hereinafter abbreviated as PET12) having a silicon oxide vapor-deposited layer on one surface of a corona discharge treated surface of a 25 μm thick biaxially stretched polyamide film (hereinafter abbreviated as ON25) via an adhesive. The 15 μm-thick ethylene-vinyl alcohol copolymer having the other surface (corona discharge-treated surface) and an aluminum vapor-deposited layer on one surface of the PET 12 with an adhesive on one surface (silicon oxide vapor-deposited layer surface). One side (aluminum vapor deposition layer side) of a polymer film (hereinafter abbreviated as EVOH15) is laminated, and then an unstretched polypropylene film (hereinafter referred to as CPP30) having a thickness of 30 μm via an adhesive on the other side of the EVOH15. A laminated body as a comparative example was obtained by laminating the abbreviated corona discharge treated surfaces.
Laminate structure: ON25 / adhesive / PET12 / silicon oxide vapor deposition layer / adhesive / aluminum vapor deposition layer / EVOH15 / adhesive / CPP30

[Comparative Example 3]
A 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter, referred to as a 20 μm thick biaxially stretched polypropylene film (hereinafter abbreviated as OPP20) having a silicon oxide vapor-deposited layer on one surface via an adhesive on the corona discharge treated surface. The other surface (corona discharge treated surface) of PET12 is laminated, and then a 15 μm-thick biaxially stretched polyamide film (hereinafter abbreviated as ON15) is bonded to the silicon oxide deposition surface of PET12 via an adhesive. A 12 μm-thick ethylene-vinyl alcohol copolymer film (hereinafter referred to as “on”) having one corona discharge treatment surface laminated, and then having an aluminum vapor deposition layer on one surface through an adhesive on the other corona discharge treatment surface of the ON15. , EVOH12 is abbreviated as one surface (aluminum deposition layer surface), and then the other surface of the EVOH12 (corona discharge) Unstretched high density polyethylene film 50μm thick over the adhesive to bedding plane) (hereinafter, to obtain a laminate of the comparative example by laminating a corona discharge treated surface of the abbreviated HDPE50).
Laminate structure: OPP20 / adhesive / PET12 / silicon oxide vapor deposition layer / adhesive / ON15 / adhesive / aluminum vapor deposition layer / EVOH12 / adhesive / HDPE50

  Examples 1-3 are the structures which do not use "the ethylene vinyl alcohol copolymer film layer which vapor-deposited aluminum" used in Comparative Examples 1-3, and "the ethylene vinyl alcohol copolymer film layer which vapor-deposited aluminum" The occurrence of “heat shrinkage wrinkles” and “sagging” due to the above-mentioned causes can be eliminated, so that quality defects (15.5%) occurring in Comparative Examples 1 to 3 can be eliminated. As a result, Examples 1 to 3 are comparative examples. The yield could be improved by 15.5% with respect to 1-3.

Further, the moisture permeability and oxygen gas permeability of the laminates of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated, and the results are shown in Tables 1 to 3. The moisture permeability test was measured in an environment of 40 ° C. and 90% RH, and the oxygen gas permeability was measured in an environment of 23 ° C. and 60% RH.
Moisture permeability:
Measured according to JIS Z 0208 [moisture permeability test (cup method)] Unit: g / m ² · day
Oxygen gas permeability:
Measured with MOCON OX-TRAN MODEL 2/21 Unit is ml / m ² · day · MPa

As is clear from Tables 1 to 3, Examples 1 and 2 are Comparative Examples 1 and 2 corresponding to each.
Although the moisture permeability is slightly inferior to the above, the laminate for a vacuum heat insulating material is at a level where there is no problem if the moisture permeability is 0.5 g / m ² · day or less, and the oxygen gas permeability is the same level. As a result, both were preferable results as a laminate for a vacuum heat insulating material.

DESCRIPTION OF SYMBOLS 1 Laminated body for vacuum heat insulating materials 1 'Outer covering material 2 Vacuum heat insulating material 10 Adhesive layer 11 Base material layer 12 Oxygen gas barrier layer 13 Thermal adhesive resin layer 20 Thermal insulation core material A Thermal bonding part

Claims (2)

In a laminated body for vacuum insulation used in a vacuum insulation material in which a heat insulation core material is enclosed by an outer envelope material made of a laminate, and the inside enclosed by the outer envelope material is evacuated to be in a vacuum state. A biaxially stretched polyester film comprising a material layer, an adhesive layer, an oxygen gas barrier layer, an adhesive layer, and a heat-adhesive resin layer in this order, and the oxygen gas barrier layer having an inorganic or metal oxide vapor deposition layer on one surface The adhesive layer on the side in contact with the vapor deposition layer has a coating amount of 4 g / m ² · dry thickness or more and a coating amount of 4 g / m ² · dry thickness at 23 ° C. and 60%. A laminate for a vacuum heat insulating material, characterized by being formed of an adhesive having an oxygen gas barrier performance of 90 ml / m ² · day · MPa or less when measured under RH measurement conditions. A heat insulating core material is enclosed in an outer envelope material using the laminate for a vacuum heat insulating material according to claim 1, and the inner envelope material is degassed and hermetically packaged in a vacuum state. Vacuum insulation material.

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