JP2018025300A - External capsule material for vacuum heat insulation material, vacuum heat insulation material and item with vacuum heat insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, as a main object of this invention, an external capsule material for vacuum heat insulation material or the like capable of forming a vacuum heat insulation material enabling a heat insulation performance to be kept for a long period of time even under a high temperature.SOLUTION: This invention accomplishes the prescribed object by providing an external capsule for vacuum heat insulation material having a heat deposition film and a gas barrier film showing a feature that the gas barrier film has a resin base material and a gas barrier layer arranged in at least one surface side of the resin base material, a temperature of atmosphere is varied from 20°C to 145°C when a size of the external capsule for vacuum heat insulation material at the time of 20°C of the temperature of atmosphere is applied as a reference, and after the temperature of the atmosphere is kept at 145°C for one hour, a dimensional change rate of the external capsule for vacuum heat insulation material when the temperature of atmosphere is changed from 145°C to 20°C is less than 1%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outer packaging material for a vacuum heat insulating material and the like that can form a vacuum heat insulating material that can maintain heat insulating performance for a long period of time.

  In recent years, reduction of greenhouse gases has been promoted in order to prevent global warming, and energy saving is required for electrical products, vehicles, equipment, buildings, and the like. For example, from the viewpoint of reducing power consumption, the use of vacuum heat insulating materials for electrical products and the like is being promoted. In equipment that has a heat generating part inside the main body, such as electrical products, and equipment that has a heat retaining function using heat from the outside, it is possible to improve the heat insulation performance of the equipment as a whole by providing a vacuum heat insulating material It becomes. In this way, efforts are being made to reduce the energy of devices such as electrical products by using vacuum heat insulating materials.

  The vacuum heat insulating material is a material in which a core material is disposed in a bag body formed of an outer packaging material, the inside of the bag body in which the core material material is disposed is depressurized to be in a vacuum state, and an end of the bag body is thermally welded. It is formed by sealing. Since the convection of the gas is blocked by making the inside of the heat insulating material a vacuum state, the vacuum heat insulating material can exhibit high heat insulating performance. Moreover, in order to maintain the heat insulation performance of a vacuum heat insulating material for a long period, it is necessary to maintain the inside of the bag body formed using the outer packaging material in a high vacuum state for a long time. Therefore, the outer packaging material has various functions such as gas barrier performance for preventing gas such as water vapor and oxygen from permeating from the outside into the heat insulating material, and thermal bonding performance for covering and sealing the core material. Is required.

  Therefore, the outer packaging material is configured as a laminate having a plurality of films having these functional characteristics. As an aspect of a general outer packaging material, a heat-weldable film, a gas barrier film, and a protective film are laminated, and each layer is bonded through an adhesive or the like (Patent Documents 1 and 2). reference). In Patent Document 1, it is described that two nylon films are used as the outer packaging material for the purpose of preventing the vacuum state from being lowered due to generation of pinholes in the gas barrier film by skewering or the like. Moreover, in patent document 2, when forming a vacuum heat insulating material using the said outer packaging material, it aims at making the influence of a bending | flexion not directly exerting on a gas barrier film in the edge part which bonded the said outer packaging materials together. Further, it is described that protective films having a high tensile elastic modulus are arranged on both surfaces of a gas barrier film.

JP 2003-262296 A JP 2013-103343 A

  However, in the outer packaging materials of Patent Literature 1 and Patent Literature 2, even when it is confirmed that the outer packaging material alone exhibits sufficient barrier performance, a vacuum heat insulating material is formed using the outer packaging material. In such a case, there is a problem that the vacuum state cannot be sufficiently maintained and the long-term heat insulation performance cannot be maintained. In particular, when the vacuum heat insulating material is exposed to a high temperature, there is a problem that the heat insulating performance deteriorates with time even if the vacuum heat insulating material has a low initial thermal conductivity.

  The present invention has been made in view of the above-mentioned problems, and it is a main object of the present invention to provide a vacuum insulation outer packaging material or the like capable of forming a vacuum insulation capable of maintaining a heat insulation performance for a long time even at a high temperature. And

  As a result of repeated research to solve the above problems, the present inventors have found that when the outer packaging material for vacuum heat insulating material contracts when exposed to heat, the gas barrier film becomes wrinkles, cracks occur, and the vacuum heat insulating material When the outer packaging material is stretched, it is pulled by the gas barrier film and cracks are generated, and the heat expansion and contraction of the outer packaging material for vacuum heat insulating material can be a factor of deterioration of the heat insulating performance of the vacuum heat insulating material, and the present invention is completed. It came to.

  That is, the present invention is an outer packaging material for a vacuum heat insulating material having a heat-weldable film and a gas barrier film, and the gas barrier film is disposed on at least one surface side of the resin base material and the resin base material. A temperature of the atmosphere is changed from 20 ° C. to 145 ° C. when the dimension of the outer packaging material for vacuum heat insulating material when the atmosphere temperature is 20 ° C. is used as a reference. Is maintained at 145 ° C. for 1 hour, and then the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less. Providing outer packaging materials.

  According to the present invention, when the temperature of the atmosphere in which the outer packaging material is disposed is changed, the dimensional change rate of the outer packaging material is within a specific range, thereby maintaining high gas barrier performance even at high temperatures. The outer packaging material can be made. Therefore, the outer packaging material can form a vacuum heat insulating material that can maintain the heat insulating performance for a long time even at a high temperature.

  In the present invention, when the storage elastic modulus is measured at a frequency of 10 Hz by a tensile method using a dynamic viscoelasticity measuring device, the storage elastic modulus at 100 ° C. with respect to the value of the storage elastic modulus at 0 ° C. The value ratio is preferably 25% or more. When the change in the storage elastic modulus due to the tensile method accompanying the temperature change is small, the resin base material constituting the gas barrier film and other resin layers constituting the outer packaging material are difficult to be softened by heat. Deterioration of the gas barrier layer due to the dimensional change can be suppressed. Moreover, the fall of the gas barrier performance of the said resin base material or resin layer itself by softening can also be suppressed. This is because the outer packaging material of the present invention can exhibit good dimensional stability and gas barrier performance against temperature changes.

  In the present invention, it is preferable that at least the resin substrate does not contain an ethylene-vinyl alcohol copolymer resin (hereinafter sometimes referred to as EVOH resin). It becomes difficult for the dimensional change of the gas barrier film due to heat to occur, and deterioration of the gas barrier layer due to the dimensional change due to heat can be suppressed. This is because the outer packaging material of the present invention can exhibit good dimensional stability and gas barrier performance against temperature changes.

  In the present invention, the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. when the dimension of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is 20 ° C. is used as a reference. It is preferable that the dimensional change rate of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. after holding at 145 ° C. for 1 hour is 0.5% or less. If the dimensional change rate of the outer packaging material when the temperature of the atmosphere in which the outer packaging material is disposed is changed is within the above range, the outer packaging material can maintain higher gas barrier performance even at high temperatures. Can do. Therefore, the outer packaging material can be an outer packaging material capable of forming a vacuum heat insulating material that can maintain the heat insulating performance for a longer period of time even at a high temperature.

  In the present invention, the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. is 1% or less, and the temperature of the atmosphere is held at 145 ° C. for 1 hour. It is preferable that the dimensional change rate of the outer packaging material for a vacuum heat insulating material is 0.5% or less. If the rate of dimensional change of the outer packaging material is within the above range, the stress applied to the gas barrier layer can be suppressed even when the outer packaging material is exposed to heat, so that the occurrence of cracks in the gas barrier layer is suppressed. This is because an outer packaging material capable of forming a vacuum heat insulating material that can maintain heat insulating performance for a long time even at high temperatures can be obtained.

  In the present invention, it is preferable that at least one of the gas barrier films has an overcoat layer on the surface of the gas barrier layer opposite to the resin substrate. It is because the gas barrier performance of the gas barrier film can be improved by having the overcoat layer.

  In the present invention, it is preferable to have a protective film on the surface of the gas barrier film opposite to the thermally weldable film. This is because the outer packaging material having the protective film can protect other layers of the outer packaging material used together, such as a heat-weldable film and a gas barrier film.

  In the present invention, it is preferable to have two or more gas barrier films. This is because the gas barrier performance of the outer packaging material can be further improved.

  The present invention is a vacuum heat insulating material having a core material and an outer packaging material for vacuum heat insulating material that encloses the core material, wherein the outer packaging material for vacuum heat insulating material includes a heat-weldable film and a gas barrier film. The gas barrier film has a resin base material and a gas barrier layer arranged on at least one surface side of the resin base material, and the dimensions of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is 20 ° C. When the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., the temperature of the atmosphere is held at 145 ° C. for 1 hour, and then the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. The vacuum insulation material is characterized in that the dimensional change rate of the vacuum insulation material is 1% or less.

  According to the present invention, the vacuum heat insulating material envelope can be a vacuum heat insulating material capable of maintaining heat insulating performance for a long period of time even at high temperatures because the vacuum heat insulating material outer packaging material is the above-described vacuum heat insulating material outer packaging material.

  The present invention is an article with a heat insulating region and an article with a vacuum heat insulating material provided with a vacuum heat insulating material, the vacuum heat insulating material having a core material and a vacuum heat insulating material enclosing material enclosing the core material. The outer packaging material for a vacuum heat insulating material has a heat-weldable film and a gas barrier film, and the gas barrier film includes a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material. And the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is 145 ° C. The dimensional change rate of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. after being held for 1 hour is 1% or less. I will provide a.

  According to the present invention, the vacuum heat insulating material provided in the article is a vacuum heat insulating material using the above-described outer packaging material for vacuum heat insulating material, and can maintain heat insulating performance for a long period of time even at a high temperature. An article having performance can be obtained. For example, if the article is a device having a heat source part, by providing the vacuum heat insulating material, it is possible to insulate heat from the heat source part and prevent the temperature of the entire device from becoming high, If the article is a device having a heat retaining part, the temperature of the heat retaining part can be maintained by providing the vacuum heat insulating material. Therefore, it can be set as the apparatus which has the high energy saving characteristic which suppressed power consumption.

  In this invention, there exists an effect that the outer packaging material for vacuum heat insulating materials etc. which can form the vacuum heat insulating material which can maintain heat insulation performance for a long period of time also at high temperature can be provided.

It is a schematic sectional drawing which shows an example of the outer packaging material for vacuum heat insulating materials of this invention. It is a schematic sectional drawing which shows an example of the vacuum heat insulating material of this invention. It is a schematic sectional drawing which shows the other example of the outer packaging material for vacuum heat insulating materials of this invention. It is a graph which shows the time-dependent change of the heat conductivity of the vacuum heat insulating material produced in the Example and the comparative example. It is a graph which shows the correlation with the dimensional change rate before and behind the high temperature holding | maintenance of the envelope material for vacuum heat insulating materials produced in the Example and the comparative example, and the time-dependent thermal conductivity of a vacuum heat insulating material. It is a graph which shows the correlation with the deterioration amount of the water vapor transmission rate after the high temperature storage of the packaging material for vacuum heat insulating materials produced in the Example and the comparative example, and the temporal heat conductivity of a vacuum heat insulating material. It is a graph which shows the correlation with the dimensional change rate in the constant temperature process of the envelope material for vacuum heat insulating materials produced in the Example and the comparative example, and the time-dependent thermal conductivity of a vacuum heat insulating material. It is a graph which shows the correlation with the oxygen permeability of the outer packaging material for vacuum heat insulating materials produced by the Example and the comparative example, and the temporal heat conductivity of a vacuum heat insulating material. It is a graph which shows the correlation with the deterioration amount of the oxygen permeability after the high temperature storage of the packaging material for vacuum heat insulating materials produced in the Example and the comparative example, and the time-dependent thermal conductivity of a vacuum heat insulating material. It is a graph which shows the time-dependent change of the dimensional change rate of an experiment example and a comparative experiment example. It is explanatory drawing explaining the sampling method of the measurement sample for measuring a dimensional change rate.

Hereinafter, the vacuum insulation material outer packaging material, the vacuum insulation material, the article with the vacuum insulation material, the vacuum insulation material design method, and the vacuum insulation material manufacturing method of the present invention will be described in detail.
In the present specification, “external packaging material for vacuum heat insulating material” may be abbreviated as “external packaging material”.

A. Vacuum insulation outer packaging material The vacuum insulation outer packaging material of the present invention can be broadly divided into two modes. Each aspect will be described below.

(A-1) 1st aspect Hereinafter, the outer packaging material for vacuum heat insulating materials of the 1st aspect in this invention is demonstrated.
The outer packaging material for vacuum heat insulating material of this aspect is an outer packaging material for vacuum heat insulating material having a heat-weldable film and a gas barrier film, and the gas barrier film includes a resin base material and at least one surface of the resin base material Gas barrier layer disposed on the side, and when the temperature of the atmosphere is 20 ° C., based on the dimensions of the outer packaging material for vacuum heat insulating material, the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. The dimensional change rate of the outer packaging material for vacuum heat insulating material is 1% or less when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. after holding the temperature of the atmosphere at 145 ° C. for 1 hour. It is a feature.

  The outer packaging material of this aspect is demonstrated with reference to figures. FIG. 1 is a schematic cross-sectional view showing an example of the outer packaging material of this aspect. As illustrated in FIG. 1, the outer packaging material 10 of this embodiment includes a thermally weldable film 1 and a gas barrier film 2, and the gas barrier film 2 includes at least a resin base material 3 and the resin base material 3. And a gas barrier layer 4 disposed on one surface side. In FIG. 1, the gas barrier film 2 includes a resin base material 3 and a gas barrier layer 4 disposed on at least one surface side of the resin base material 3. The outer packaging material 10 has a dimensional change rate within a specific range at a high temperature.

  FIG. 2 is a schematic cross-sectional view showing an example of a vacuum heat insulating material using the outer packaging material of this embodiment. As illustrated in FIG. 2, the vacuum heat insulating material 20 includes a core material 11 and an outer packaging material 10 that encloses the core material 11. The vacuum heat insulating material 20 is configured so that the two outer packaging materials 10 face each other so that the respective heat-weldable films 1 face each other, and the core material 11 is disposed therebetween, and then the outer periphery of the core material 11 is arranged. One end is used as an opening, and the end portions 12 of the remaining three outer packaging materials 10 are joined to prepare a bag body that is formed by two outer packaging materials 10 and in which the core material 11 is arranged. Then, the opening 11 is sealed in a state where the internal pressure of the bag body is reduced, whereby the core material 11 is sealed in the outer packaging material 10. Note that the reference numerals in FIG. 2 indicate the same members as those in FIG.

  According to this aspect, when the temperature of the atmosphere in which the outer packaging material is disposed is changed, the dimensional change rate of the outer packaging material is within a specific range, thereby maintaining high gas barrier performance even at high temperatures. The outer packaging material can be made. Therefore, the outer packaging material can form a vacuum heat insulating material that can maintain the heat insulating performance for a long time even at a high temperature.

  Even if the vacuum heat insulating material has a low initial thermal conductivity, the heat insulating performance generally decreases with time when exposed to high temperatures. There are various reasons for this, but as a result of extensive research, the present inventors have found that outer packaging materials with large dimensional expansion and contraction when exposed to high temperatures have a decrease in heat insulation performance over time at high temperatures. It was found that it was large and resulted in the present invention.

  The deterioration of the heat insulation performance is due to the shrinkage of the outer packaging material exposed to heat, the gas barrier film becomes wrinkled, cracks are generated, and when the outer packaging material for vacuum heat insulating material is stretched, it is pulled by the gas barrier film, It is presumed that expansion and contraction due to heat of the outer packaging material for vacuum heat insulating material such as cracks is caused by lowering the degree of vacuum inside the vacuum heat insulating material. Various resin films are generally used for each film constituting the outer packaging material, and some of such resin films expand in size when exposed to heat, and some contract. When the gas barrier film used for the outer packaging material is composed of a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material, when the dimensions of the resin base material are reduced, the gas barrier layer In addition, when a compressive stress is applied, and when the dimension of the resin base material is increased, a tensile stress is also applied to the gas barrier layer, so that the gas barrier layer is likely to be cracked. Furthermore, even when other layers used together with the gas barrier film in the outer packaging material such as a heat-weldable film and a protective film expand and contract, the gas barrier layer close to the other layer is also subjected to compressive stress and tensile stress, Similarly, cracks are likely to occur. Therefore, in this aspect, by defining the dimensional change rate of the entire outer packaging material when exposed to a high temperature, it is possible to realize an outer packaging material having high gas barrier performance even at a high temperature.

Here, in general, in a laminate including a resin layer or the like, a dimensional change due to an external force load may occur in addition to a dimensional change due to heat (thermal stress). The present inventors have found that there is no correlation between the deterioration of the gas barrier performance due to an external force load and the deterioration of the gas barrier performance due to a temperature change, as shown in Examples and Comparative Examples described later. That is, the dimensional change due to an external force load, and the deterioration of the gas barrier performance caused by it, and the dimensional change due to heat, and the deterioration of the gas barrier performance caused by the same cannot be equated, and the gas barrier derived from the external force load. From the deterioration tendency of performance, it is estimated that it is difficult to specify the deterioration tendency of the heat-derived gas barrier performance.
Therefore, when examining the deterioration tendency of the gas barrier performance due to the dimensional change of the outer packaging material, it is necessary to consider the dimensional change due to heat and the dimensional change due to external force load, respectively. The present invention has been completed by paying attention to deterioration of gas barrier performance caused by dimensional change due to heat. In addition, having gas barrier performance specifically means having at least one of water vapor barrier performance for preventing permeation of water vapor and oxygen barrier performance for preventing permeation of oxygen, and more preferably has both.

  The outer packaging material of this embodiment has at least a heat-weldable film and a gas barrier film. Hereinafter, each structure of the outer packaging material of this aspect is demonstrated.

1. Characteristics of outer packaging material for vacuum heat insulating material (1) Dimensional change rate of outer packaging material for vacuum heat insulating material The outer packaging material of this aspect has a specific dimensional change rate at high temperatures. That is, based on the dimensions of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C., the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is set to 1 at 145 ° C. After holding for a period of time, when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C., the dimensional change rate of the vacuum insulation outer packaging material (hereinafter referred to as “the dimensional change rate of the outer packaging material before and after high temperature holding”) 1) or less, preferably 0.5% or less, more preferably 0.4% or less, and particularly 0.3% or less. If the rate of dimensional change of the outer packaging material before and after holding the high temperature is within the above range, even if the outer packaging material is exposed to heat, the stress applied to the gas barrier layer can be suppressed, and therefore, the generation of cracks in the gas barrier layer This is because an outer packaging material capable of forming a vacuum heat insulating material that can maintain heat insulating performance for a long time even at high temperatures can be obtained.
Among them, the water vapor barrier performance among the gas barrier performance is mainly exerted by the gas barrier layer constituting the gas barrier film, and the physical properties are lowered by the deterioration of the gas barrier layer due to the dimensional change of the surrounding layers. It tends to be easy. In this aspect, since the dimensional change rate of the outer packaging material before and after the high temperature holding is within the above range, the deterioration of the gas barrier layer and the water vapor permeability before and after the high temperature holding can be suppressed. Regardless, it is possible to exhibit high gas barrier performance, particularly high water vapor barrier performance.

  Further, in this embodiment, the dimensional change rate of the outer packaging material when the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. (hereinafter sometimes referred to as “heating process”) is 1% or less. Among these, 0.7% or less, particularly 0.5% or less is preferable. The dimensional change rate of the outer packaging material when the temperature of the outer packaging material is held at 145 ° C. for 1 hour (hereinafter, sometimes referred to as “constant temperature process”) is 0.5% or less, In particular, it is preferably 0.3% or less, particularly preferably 0.1% or less. Furthermore, the dimensional change rate of the outer packaging material when the ambient temperature of the outer packaging material is changed from 145 ° C. to 20 ° C. (hereinafter, sometimes referred to as “temperature lowering process”) is 1% or less, It is preferably 0.7% or less, particularly 0.5% or less. If the rate of dimensional change in each process of the outer packaging material is within the above range, even when the outer packaging material is exposed to heat, the stress applied to the gas barrier layer can be suppressed, so that the cracking in the gas barrier layer is prevented. This is because an outer packaging material capable of forming a vacuum heat insulating material that can be suppressed and can maintain heat insulating performance for a long time even at high temperatures can be obtained.

  The dimensional change rate of the outer packaging material when the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. may be referred to as “the dimensional change rate of the outer packaging material in the temperature rising process”. In addition, the dimensional change rate of the outer packaging material when the temperature of the atmosphere is held at 145 ° C. for 1 hour may be referred to as “the dimensional change rate of the outer packaging material in a constant temperature process”. Further, the dimensional change rate of the outer packaging material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. may be referred to as “the dimensional change rate of the outer packaging material in the temperature lowering process”.

  The dimensions of the outer packaging material, the dimensional change rate of the outer packaging material before and after holding at high temperature, and the dimensional change rate of the outer packaging material in each process can be measured and defined by the following methods. FIG. 11 is an explanatory diagram for explaining a method of collecting a measurement sample for measuring dimensions. First, a test piece of a desired size (within a one-dot broken line region in FIG. 11) is cut out from the outer packaging material 10 before being held at a high temperature. The number N of test pieces may be at least N ≧ 1, and normally N ≧ 3. In the plane of each test piece, a reference point P and a reference axis L extending in any one direction X in the plane starting from the reference point P are set, and on the reference axis L, the reference axis L A rectangular measurement sample S whose longitudinal direction is the one direction X (axial direction) is collected. The measurement sample is a rectangle having a length in the short direction of 5 mm and a length in the long direction of 23 mm. The sampling position of the measurement sample S on the reference axis L can be, for example, a position where the center of the rectangle passes through the reference axis L. Next, the reference axis L is rotated by 22.5 ° with the reference point P as the rotation center, and the measurement sample S is similarly collected at each rotation position. As a result, 16 measurement samples S are collected radially around the reference point P in the plane for each test piece. The measurement samples are all rectangular with the above dimensions.

  For each test piece, the dimensions of the 16 measurement samples collected are measured under the following dimensional measurement conditions when the temperature of the atmosphere before holding at high temperature is 20 ° C., and the 16-point average value is calculated. Here, the “dimension” of the measurement sample to be measured is the “dimension in the longitudinal direction” of the measurement sample. Further, “when the temperature of the atmosphere is 20 ° C.” means when the temperature of the atmosphere is in the range of 20 ° C. ± 0.5 ° C. The dimension of the measurement sample at this time is referred to as “reference dimension”. For each test piece, a 16-point average value of reference dimensions is calculated, and a value obtained by averaging the 16-point average value by the number of test pieces is defined as “size of outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C.”. . The “size of the outer packaging material for vacuum heat insulating material when the ambient temperature is 20 ° C.”, which is a reference for calculating the dimensional change rate, is referred to as “the size of the outer packaging material for vacuum heat insulating material before holding at high temperature”. Sometimes.

  Next, for each test piece, the collected 16 measurement samples are placed in the order of the heating process, the constant temperature process, and the cooling process, respectively. A series of processes of temperature increase, constant temperature, and temperature decrease is performed using a thermomechanical analyzer (TMA) under the following conditions. In each process, the dimension of the measurement sample is continuously measured over time under the following dimension measurement conditions.

(Dimension measurement conditions)
Thermomechanical analyzer: TMA / SS6100 manufactured by Hitachi High-Tech Science Co., Ltd.
Measurement mode: Tensile mode, load 100mN
Measurement sample: 23 mm (longitudinal direction) × 5 mm (short side direction) rectangular distance between chucks: 20 mm
Temperature rise start temperature: 20 ° C
Temperature rise end temperature: 145 ° C (holding time at 145 ° C: 1 hour)
Temperature drop end temperature: 20 ° C
Temperature increase / decrease rate: 10 ° C / min
Measurement atmosphere: Under nitrogen purge Dimension measurement frequency: 0.16 minute increments

For each measurement sample after going through a series of processes of temperature rise, constant temperature, and temperature drop, the longitudinal dimension when the temperature of the atmosphere is 20 ° C. is measured, and the rate of change from the reference dimension, that is, the measurement sample Calculate the dimensional change rate before and after holding at high temperature. The dimensional change rate before and after holding the measurement sample at a high temperature can be defined by the following formula (1).
Dimensional change rate (%) before and after holding high temperature of measurement sample = | L ₀ −L ₁ | / L ₀ × 100 (1)
(Here, L ₀ in the formula (1) is a reference dimension, and L ₁ is a dimension of the measurement sample after going through a series of processes of temperature increase, constant temperature, and temperature decrease.)
Then, for each test piece, a 16-point average value of the dimensional change rate before and after holding at high temperature was calculated, and the average value of the dimensional change rate by the number of test pieces was calculated as “dimensional change rate of outer packaging material for vacuum heat insulating material before and after holding high temperature "

Further, for each of the 16 measurement samples collected for each test piece, the ratio of the dimensional change amount of the measurement sample in each process with respect to the reference dimension in each of the temperature rising process, the constant temperature process, and the temperature falling process, that is, the dimensional change Calculate the rate. For each test piece, a 16-point average value of the dimensional change rate in each step of the measurement sample is obtained, and the value obtained by averaging the dimensional change rate by the number of test pieces is referred to as “the dimensional change rate of the vacuum insulation outer packaging material in each process”. To do. The dimensional change rate of the measurement sample in each process is expressed by the formula (1), where the minimum dimension L _min is the minimum dimension in the longitudinal direction of the target measurement sample and the maximum dimension L _max is the maximum. 2). L ₀ in formula (2) is the same reference dimension as in formula (1).
Dimensional change rate (%) of measurement sample in each step = (L _max −L _min ) / L ₀ × 100 (2)
L _min and L _max correspond to L ₂ and L ₃ in formula (4) in the preliminary method described later.

Specifically, in the temperature rising process, the dimensional change rate of the measurement sample is the minimum dimension L _{min in} the longitudinal direction of the measurement sample and the maximum dimension from 20 ° C. at the start of temperature increase to 145 ° C. at the end. L _max can be specified and calculated from equation (2). Then, the 16-point average of the dimensional change rate of the measurement sample calculated by the equation (2) can be used as the dimensional change rate in the temperature rising process of the test piece. The dimensional change rate of the outer packaging material in the temperature process ”.
In the case of a constant temperature process, the dimensional change rate of the measurement sample is determined by specifying the minimum dimension L _min and the maximum dimension L _max in the longitudinal direction of the measurement sample from the start to the end of holding at 145 ° C. 2). And the dimensional change rate of the outer packaging material in a constant temperature process is computable by the method similar to the case of a temperature rising process.
Similarly, in the case of the temperature lowering process, the dimensional change rate of the measurement sample is calculated from the formula (2) by specifying the minimum dimension L _min and the maximum dimension L _max between 145 ° C. at the start of cooling and 20 ° C. at the end. be able to. Then, the dimensional change rate of the outer packaging material in the temperature lowering process can be calculated by the same method as in the temperature rising process.

  As the dimensional change rate for the outer packaging material of the present aspect described above, an average value of 16 points different from each other by 22.5 ° is used for at least three test pieces (N ≧ 3) sampled from the outer packaging material. It is possible to use an average value of at least 48 dimensional change ratios in total. Note that the number of test pieces is 1 or more (N ≧ 1), and the average value of the dimensional change rates of 16 measurement samples in each test piece is within the range of the dimensional change rates of the outer packaging material described above. It is preferable.

  In addition, the dimensional change rate of the outer packaging material before and after holding at a high temperature and in each process is usually measured using the above-described method, but can be defined using the following preliminary method specifying the film forming direction. It is. The dimensional change rate of the outer packaging material according to the preliminary method means that the measurement sample is heated from 20 ° C. to 145 ° C. under the following conditions using a thermomechanical analyzer (TMA: Thermomechanical Analyzer), followed by 145 ° C. In each of the constant temperature process for 1 hour and the subsequent temperature decrease process from 145 ° C. to 20 ° C., the initial value (temperature increase) of the continuous film forming direction; the direction perpendicular to the film longitudinal direction; the film width direction) Dimensional change rate with respect to the previous dimension at 20 ° C.). As the thermomechanical analyzer, for example, TMA / SS6100 manufactured by Hitachi High-Tech Science Co., Ltd. can be used.

Measurement mode: Tensile mode, load 100mN
Sample length: 20mm
Sample width: 5mm
Temperature rise start temperature: 20 ° C
Temperature rise end temperature: 145 ° C (holding time at 145 ° C: 1 hour)
Temperature drop end temperature: 20 ° C
Temperature increase / decrease rate: 10 ° C / min
Measurement atmosphere: under nitrogen purge

The dimensional change rate before and after the high temperature holding by the preliminary method is defined by the following formula (3). However, the dimension of the outer packaging material at 20 ° C. before the temperature rise is defined as L ₀ in the formula (3), and the dimension of the outer packaging material that has undergone the temperature rising process, the constant temperature process, and the temperature lowering process is defined as L _{1 in the} formula (3).
Dimensional change rate before and after holding at high temperature (%) = | L ₀ −L ₁ | / L ₀ × 100 (3)
Moreover, the dimensional change rate in each process of the temperature raising process, the constant temperature process, and the temperature lowering process by the preliminary method is defined by the following formula (4). However, the dimension of the outer packaging material at 20 ° C. before the temperature rise is set to L ₀ in the formula (4), and the minimum dimension of the outer packaging material obtained in the measurement process is set to L ₂ in the formula (4). the maximum dimension of the outer cover material and L ₃ of formula (4).
Dimensional change rate (%) in each process = (L ₃ −L ₂ ) / L ₀ × 100 (4)

(2) Water vapor permeability of outer packaging material for vacuum heat insulating material The water vapor permeability of the outer packaging material of this embodiment in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH is 0.01 g / (m ² · day) or less. 0.008g ^/ (m 2 · day) or less, and particularly preferably at 0.005g ^/ (m 2 · day) or less. This is because, by setting the water vapor permeability of the outer packaging material within the above range, an increase in the thermal conductivity of the vacuum heat insulating material can be suppressed due to the penetration of water vapor from the outside of the outer packaging material. The water vapor permeability of the outer packaging material for vacuum heat insulating material at this time may be referred to as “water vapor permeability before high-temperature storage”.

In addition, the water vapor transmission rate of the outer packaging material is ISO-15106-5: 2015 using a water vapor transmission rate measuring device (manufactured by Technolox Ltd., DELTAPERRM) in an atmosphere of a measurement temperature of 40 ° C. and a humidity of 90% RH. It can be measured according to (differential pressure method). The measurement is carried out so that the surface located on the gas barrier film side of the surface of the outer packaging material on the gas barrier film side is the high humidity side (water vapor supply side) with respect to the film that can be thermally welded in the thickness direction of the outer packaging material. It is mounted between the upper chamber and the lower chamber, and the conditions are such that the transmission area is 64 cm ² . At least three samples are measured under one condition, and the average of these measured values is taken as the value of water vapor transmission rate under that condition. Hereinafter, the water vapor permeability described in the present specification can be measured using the same method as described above.

(3) Oxygen permeability of outer packaging material for vacuum heat insulating material The oxygen permeability of the outer packaging material of this embodiment in an atmosphere of temperature 100 ° C. and humidity 0% RH is 0.05 cc / (m ² · day · atm) or less. In particular, it is preferably 0.03 cc / (m ² · day · atm) or less, particularly preferably 0.01 cc / (m ² · day · atm) or less. This is because by setting the oxygen permeability of the outer packaging material within the above range, an increase in the thermal conductivity of the vacuum heat insulating material can be suppressed due to the intrusion of oxygen from the outside of the outer packaging material. The oxygen permeability of the outer packaging material for vacuum heat insulating material at this time may be referred to as “oxygen permeability before high-temperature storage”.

The oxygen permeability of the outer packaging material is JIS K7126-2A: 2006 (plastic-film and sheet-gas permeability test method-part 2: isobaric method, Appendix A: oxygen gas permeability measured by electrolytic sensor method). With reference to the test method, measurement can be performed using an oxygen gas permeability measuring apparatus (manufactured by MOCON, USA, OXTRAN) under the conditions of a measurement temperature of 100 ° C. and a humidity of 0% RH. The measurement is carried out by mounting in the apparatus such that the surface located on the gas barrier film side is in contact with oxygen gas with respect to the film that can be heat-welded in the thickness direction of the outer packaging material among the surfaces of the outer packaging material. It carries out on the conditions of 50 cm < ² >. The said measurement is performed in the following procedures. First, the carrier gas is purged by supplying the carrier gas at a flow rate of 10 cc / min for 60 minutes or more. As the carrier gas, nitrogen gas containing about 5% hydrogen can be used. After purging, the test gas is allowed to flow through the apparatus, and after the start of the flow, 12 hours are secured as the time from the start of the flow until the equilibrium state is reached, and then the measurement is started. The test gas uses at least 99.5% dry oxygen. In one condition, at least three samples are measured, and the average of the measured values is taken as the oxygen permeability value for that condition. Hereinafter, the oxygen permeability described in this specification can be measured using the same method as described above.

(4) Deterioration amount of water vapor permeability of outer packaging material for vacuum heat insulating material In this embodiment, the deterioration amount of water vapor permeability of the outer packaging material after storage for 500 hours in an atmosphere at a temperature of 145 ° C. May be referred to as “degradation amount of water vapor transmission rate”) of 0.01 g / (m ² · day) or less, especially 0.008 g / (m ² · day) or less, particularly 0.005 g / (m ² -Day) It is preferable that it is below. Outer packaging materials whose water vapor permeability deterioration amount after high temperature storage is within the above range can keep the water vapor permeability low even when exposed to high temperature environment, so long-term insulation performance even in high temperature environment It is because it can be set as the outer packaging material which can form the vacuum heat insulating material which can maintain this.

  In this embodiment, the amount of water vapor permeability deterioration after high temperature storage is measured by the following procedure. First, two outer packaging materials (dimensions: 360 mm × 450 mm) are prepared, and a vacuum heat insulating material is produced by a general procedure. That is, the two outer packaging materials are stacked and heat sealed in the three directions of the rectangle to produce a bag body in which only one direction is opened. Glass wool (dimensions: 300 mm × 300 mm × 30 mm) is used as a core material, and after drying, calcium oxide (amount used: 5 g) is stored in the bag body as the core material and a desiccant. The inside of the body is evacuated, and the opening of the bag is sealed by heat welding to produce a vacuum heat insulating material (attainable pressure: 0.05 Pa). The heat welding temperature at the time of heat-sealing the outer packaging material and the size of the region to be heat-sealed can be appropriately set depending on the melting point of the heat-weldable film of the outer packaging material used, the size of the outer packaging material, and the like. The temperature can be the same as the heat welding temperature and the size of the region when forming a general vacuum heat insulating material.

  After the vacuum heat insulating material produced by the above method is stored for 500 hours under a temperature of 145 ° C. and no humidity control, the outer packaging material of the vacuum heat insulating material that is not thermally welded is cut out, and the cut out portion The water vapor transmission rate of the outer packaging material is measured under the same method and conditions as the measurement method and measurement conditions of the water vapor transmission rate described in "(2) Water vapor transmission rate of the outer packaging material for vacuum heat insulating material" above. Hereinafter, the water vapor permeability of the outer packaging material after storing the vacuum heat insulating material in the atmosphere at 145 ° C. for 500 hours as described above may be referred to as “water vapor permeability after high temperature storage”.

The deterioration amount of water vapor permeability after high-temperature storage in this embodiment is the same as the water vapor permeability after high-temperature storage of the outer packaging material measured by the method as described above, in the production of a vacuum heat insulating material and stored in a high-temperature atmosphere. This is an increase from the water vapor transmission rate of the outer packaging material that is not manufactured and stored in a high temperature atmosphere when compared with the water vapor transmission rate of the outer packaging material. That is, the deterioration amount can be calculated by the following equation.
Deterioration amount of water vapor permeability after high temperature storage of outer packaging materials = (Water vapor permeability after high temperature storage)-(Water vapor permeability before high temperature storage)

(5) Deterioration amount of oxygen permeability of outer packaging material for vacuum heat insulating material In this aspect, the deterioration amount of oxygen permeability of the outer packaging material after storage for 500 hours in an atmosphere at a temperature of 145 ° C. May be referred to as “degradation amount of oxygen permeability”) of 0.1 cc / (m ² · day · atm) or less, especially 0.05 cc / (m ² · day · atm) or less, particularly 0.01 cc / (M ² · day · atm) or less is preferable. Outer packaging materials whose oxygen permeability deterioration amount after storage at high temperature is within the above range can maintain low oxygen permeability even when exposed to high temperature environments, so long-term insulation performance even in high temperature environments It is because it can be set as the outer packaging material which can form the vacuum heat insulating material which can maintain this.

  In this embodiment, the deterioration amount of oxygen permeability after high temperature storage is measured by the following procedure. That is, the vacuum heat insulating material produced by the same method as described in “(4) Deterioration amount of water vapor transmission rate of outer packaging material for vacuum heat insulating material” and stored in an atmosphere at a temperature of 145 ° C. for 500 hours, Cut out the outer packaging material of the part not thermally welded, and measure the oxygen permeability of the outer packaging material of the cut-out part as described in "(3) Oxygen permeability of the outer packaging material for vacuum heat insulating material". Measure in the same method and conditions as the method and measurement conditions. Hereinafter, the oxygen permeability of the outer packaging material after storing the vacuum heat insulating material in the atmosphere at 145 ° C. for 500 hours as described above may be referred to as “oxygen permeability after high temperature storage”.

In this embodiment, the deterioration amount of oxygen permeability after high temperature storage is the oxygen permeability after high temperature storage of the outer packaging material measured by the method as described above, and the vacuum insulation material is prepared and stored in a high temperature atmosphere. This is an increase from the oxygen permeability of the outer packaging material that is not manufactured and stored in a high temperature atmosphere when compared with the oxygen permeability of the outer packaging material that is not present. That is, the deterioration amount can be calculated by the following equation.
Degradation amount of oxygen permeability after high temperature storage = (Oxygen permeability after high temperature storage)-(Oxygen permeability before high temperature storage)

(6) Storage elastic modulus It is preferable that the outer packaging material of this aspect has a small change in storage elastic modulus due to a temperature change. Usually, when the amount of change in storage elastic modulus due to temperature change is large even in one layer of each layer constituting the laminate, the amount of change in storage elastic modulus due to temperature change also tends to increase in the entire laminate, and the dimensions due to heat Changes are likely to occur. Similarly, in the case of the outer packaging material of this aspect, it is presumed that when the storage elastic modulus changes greatly due to temperature change, dimensional change due to heat is likely to occur, and as a result, deterioration of the gas barrier layer is likely to occur.
Specifically, the change in the storage elastic modulus due to the temperature change of the outer packaging material of this aspect is small. Specifically, for the outer packaging material of this aspect, a dynamic viscoelasticity measurement (DMA) apparatus is used at a frequency of 10 Hz by a tensile method. When the storage elastic modulus is measured, the ratio of the storage elastic modulus value at 100 ° C. to the storage elastic modulus value at 0 ° C. is preferably 25.0% or more, and more preferably 25.5% or more. In particular, 26.0% or more is preferable. The storage elastic modulus measured by the tensile method is “tensile storage elastic modulus value”, the storage elastic modulus value at 0 ° C. and the storage elastic modulus value at 100 ° C. are “0 ° C.”, respectively. May be referred to as “tensile storage modulus value at 100 ° C.” and “tensile storage modulus value at 100 ° C.”.

  The outer packaging material of this aspect has a smaller difference between the tensile storage elastic modulus value at 0 ° C. and the tensile storage elastic modulus value at 100 ° C., that is, the amount of change in the tensile storage elastic modulus due to a temperature change is larger as the ratio is larger. Mean small. Since the outer packaging material of this aspect has such characteristics, it can exhibit good dimensional stability against temperature changes, and can prevent deterioration of the gas barrier layer accompanying dimensional changes. In addition, when the resin base material constituting the gas barrier film and other resin layers constituting the outer packaging material of the present embodiment are softened at a high temperature, the gas barrier performance exhibited by the resin base material and the resin layer alone is lowered. It is presumed to cause a decrease in the overall gas barrier performance. In contrast, the outer packaging material of this aspect has a small amount of change in the tensile storage modulus due to temperature change, that is, the resin base material and resin layer contained in the outer packaging material are not easily softened by heat. It becomes possible to maintain the gas barrier performance of the base material and the resin layer itself. As a result, the outer packaging material of this aspect can exhibit good gas barrier performance against temperature changes.

The storage elastic modulus of the outer packaging material of this embodiment is measured at a temperature of 0 ° C. and 100 ° C. at a frequency of 10 Hz using a dynamic viscoelasticity measuring device. Each temperature at which the tensile storage modulus is measured can be allowed within a range of ± 1.0 ° C. As the dynamic viscoelasticity measuring device, for example, Rheogel-E4000 manufactured by UBM can be used. The measurement is performed under the following conditions in accordance with JIS K7244-4: 1999 (Plastic—Dynamic Mechanical Properties Test Method Part 4: Tensile Vibration—Non-Resonance Method). First, both ends of the measurement sample are attached to the chuck so that the tensile direction is the longitudinal direction of the measurement sample, a tensile load (static load 150 mg) is applied, and a constant frequency of 10 Hz and a heating rate of 5 ° C. are applied by a tensile mode sine wave. The tensile storage modulus is measured from 0 ° C. to 200 ° C. per minute. The measured value at each temperature of 0 ° C. and 100 ° C. at this time is taken as the value of the tensile storage elastic modulus at 0 ° C. and the value of the tensile storage elastic modulus at 100 ° C., respectively. The measurement sample used for the measurement was obtained by sampling a desired size test piece from the outer packaging material, and 16 points from each test piece by the method described in the above section “(1) Dimensional change rate of outer packaging material for vacuum heat insulating material”. A measurement sample is collected, a 16-point average value of the tensile storage elastic modulus of the measurement sample is calculated for each test piece, and a value obtained by averaging the 16-point average value by the number of test pieces is taken as the storage elastic modulus of the outer packaging material. Specifically, the average value of the tensile storage elastic modulus of a total of 48 measurement samples when the number of test pieces N = 3 can be set as the storage elastic modulus of the outer packaging material. In addition, it is preferable that the number of test pieces is N ≧ 1, and the average value of the tensile storage modulus of 16 measurement samples in each test piece is within the above range.
(Measurement condition)
・ Measurement sample: 40 mm (longitudinal direction, including grip part by chuck) × 5 mm (short direction) rectangle ・ Measurement mode: Tensile method (sine wave strain tension mode)
・ Raising rate: 5 ° C / min
・ Frequency: 10Hz
・ Measurement temperature range: 0 ℃ ～ 200 ℃
・ Distance between chucks: 20mm
・ Static load: 150mg
・ Distortion amount: Automatic distortion

The ratio of the tensile storage modulus value (E ′ ₁₀₀ ) at 100 ° C. to the tensile storage modulus value (E ′ ₀ ) at ₀ ° C. can be obtained from the following formula.
Ratio of tensile storage modulus value (E ′ ₁₀₀ ) at 100 ° C. to tensile storage modulus value (E ′ ₀ ) at ₀ ° C. = (E ′ ₁₀₀ / E ′ ₀ ) × 100 (%)

(7) Dimensional change rate of outer packaging material constituent material In order to realize the outer packaging material having the above-described dimensional change rate, in this aspect, a material having a low dimensional change rate at a high temperature is used for each layer constituting the outer packaging material. It is preferable. When each layer constituting the outer packaging material shrinks, compressive stress is also applied to the adjacent gas barrier layer, and cracks are likely to occur.In this aspect, when the temperature of the atmosphere rises or when it is maintained at a high temperature. It is preferable to configure the outer packaging material using a material that does not easily shrink. In general, an inorganic substance such as a metal generally used for the gas barrier layer increases in size when the temperature of the atmosphere increases, and returns to the original size when the temperature of the atmosphere returns. Therefore, a material having the same dimensional change as that of the inorganic material described above, that is, if the temperature of the atmosphere is increased, the material is extended, if the temperature of the atmosphere is maintained, the size is maintained, and if the temperature of the atmosphere is restored, the original size is restored. It is preferable to configure the outer packaging material using the returning material.

  About the dimensional change rate when the resin film generally used for each layer which comprises an outer packaging material is exposed to heat, it can classify to some extent by the manufacturing method of those resin films. For example, nylon films and polyethylene terephthalate (PET) films, which are widely used in various technical fields, are distributed in a variety of products with different production methods, but are called biaxially stretched “PET films”. Even in such a case, the dimensional change rate depending on the temperature differs depending on whether the biaxially stretched simultaneously, sequentially stretched, or stretched twice in the manufacturing process. Therefore, in this embodiment, it is preferable to select a material having a low dimensional change rate at a high temperature and use it as a material constituting the outer packaging material from the viewpoint of a difference in orientation derived from the manufacturing method.

  From the viewpoint as described above, in this embodiment, it is preferable that a biaxially stretched polyvinyl alcohol film or an ethylene-vinyl alcohol copolymer (EVOH) resin film is not included as each layer constituting the outer packaging material. . Since the polyvinyl alcohol film and EVOH resin are films having low oxygen permeability, they have been frequently used as a film of each layer constituting the outer packaging material. However, since these are films having a high dimensional change rate at a high temperature, particularly a large shrinkage rate, when such a film is used as an outer packaging material, the overall outer packaging material has an increased dimensional change rate at a high temperature, and the gas barrier layer This is because it may lead to the generation of cracks.

Especially, it is preferable that the outer packaging material of this aspect does not contain EVOH resin at least in the said resin base material. When the resin base material contains an EVOH resin, as described above, the dimensional change rate and shrinkage rate of the gas barrier film increase under a high temperature environment, and cracks and the like are likely to occur in the gas barrier layer. Moreover, since EVOH resin itself is inferior in heat resistance and the tensile storage elastic modulus at high temperature is lowered, there is a possibility that gas barrier performance, particularly oxygen barrier performance may be lowered due to temperature change. Furthermore, since the EVOH resin itself has a low water vapor barrier performance, it may be difficult to compensate for the decrease in the water vapor barrier performance due to the deterioration of the gas barrier layer with the EVOH resin-containing resin base material. There is a problem that it tends to decrease.
For such a problem, the outer packaging material of this aspect can suppress deterioration of the gas barrier layer due to dimensional changes due to heat, because at least the resin base material constituting the gas barrier film does not contain EVOH resin. It becomes possible to improve the dimensional stability against the temperature change and the gas barrier performance.

  Here, the phrase “resin substrate does not contain EVOH resin” includes not only the case where the resin substrate does not contain EVOH resin at all, but also the case where the resin substrate does not contain EVOH resin as a main component. The resin base material "does not contain EVOH resin as a main component" means that the EVOH resin content in the resin base material is the dimensional change rate of the resin base material before and after the high temperature holding and the resin base material in each process. It means that the dimensional change rate is an amount that can be within the range of various dimensional change rates of the outer packaging material defined above. Specifically, the EVOH resin content in the resin base material is 50% by mass or less, preferably 25% by mass or less, and particularly preferably 0% by mass. When the resin substrate is a laminate composed of a plurality of layers, the EVOH resin content in the resin substrate is the EVOH resin content relative to the total amount of the laminate as the resin substrate. Can do. The presence and content of the EVOH resin in the resin substrate can be specified using, for example, infrared absorption (FT-IR) analysis, X-ray photoelectron analyzer (XPS), or the like. In addition, it can prescribe | regulate similarly to the case of a resin base material also about layers other than the resin base material mentioned later that EVOH resin is not included.

  Moreover, when the outer packaging material of this aspect has a layer (EVOH resin-containing layer) containing an EVOH resin, the thickness of the EVOH resin-containing layer is 10% or less with respect to the entire thickness (100%) of the outer packaging material. 0%, that is, it is preferable that the outer packaging material does not include the EVOH resin-containing layer in the structure. When the outer packaging material of this embodiment has a plurality of the EVOH resin-containing layers, the total thickness of the EVOH resin-containing layers is preferably in the above range with respect to the thickness of the entire outer packaging material. This is because the influence of the EVOH resin-containing layer on the gas barrier performance of the outer packaging material can be suppressed by the heat described above. Here, the layer containing the EVOH resin means a layer containing only the EVOH resin as a main component in addition to a layer composed only of the EVOH resin, and specifically, a layer in which the content of the EVOH resin is greater than 50% by mass. Say. In addition, when the EVOH resin-containing layer is included in a part of the constituent member of the outer packaging material, specifically, the resin base material in the gas barrier film that constitutes the outer packaging material is a laminate including a plurality of layers, of which When one layer is an EVOH resin-containing layer, the thickness of the EVOH resin-containing layer alone in the laminate relative to the thickness of the entire outer packaging material is preferably within the above range.

2. Gas barrier film The gas barrier film has a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material. The gas barrier layer is usually formed on at least one surface of the resin base material, and the gas barrier layer may be formed on both surfaces of the resin base material.

  A metal foil or the like may be used alone as the gas barrier film of the outer packaging material. However, since such a metal foil or the like has high gas barrier performance, the degree of vacuum inside the vacuum heat insulating material can be maintained high for a long period of time. it can. However, since inorganic materials such as the metal have high thermal conductivity and heat bridges are generated, it is difficult to reduce the thermal conductivity of the vacuum heat insulating material having such a gas barrier film. In this aspect, in view of the above problems, by configuring the gas barrier film from a resin base material and a gas barrier layer, the amount of inorganic material used in the gas barrier film can be reduced, and heat conduction by the inorganic material can be suppressed.

(1) Gas barrier layer A gas barrier layer is arrange | positioned at the at least one surface side of the said resin base material. Specifically, the gas barrier layer is formed on one surface of the resin base material and contributes mainly to the gas barrier performance of the gas barrier film. The gas barrier layer is not particularly limited as long as a desired gas barrier performance can be exhibited, and examples thereof include a layer containing a metal or an inorganic compound. Specific examples of the layer containing a metal or an inorganic compound include a metal thin film and an inorganic compound film. The gas barrier layer may or may not have transparency.

  As a metal which forms the said metal thin film, what is necessary is just a metal which can exhibit desired gas barrier performance, for example, aluminum, stainless steel, titanium, nickel, iron, copper etc. are mentioned.

  On the other hand, the inorganic compound forming the inorganic compound film may be any material that can exhibit a desired gas barrier performance. For example, inorganic oxide, inorganic oxynitride, inorganic nitride, inorganic oxide carbide, inorganic oxycarbonitride 1 or 2 or more inorganic compounds selected from the above and silicon oxide zinc. Specifically, inorganic compounds containing one or more elements selected from silicon (silica), aluminum, magnesium, calcium, potassium, tin, sodium, titanium, boron, yttrium, zirconium, mucerium, and zinc Can be mentioned. More specifically, silicon oxide, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, silicon zinc alloy oxide, indium alloy oxide, silicon nitride, aluminum nitride, titanium nitride, oxidation Examples thereof include silicon nitride. The said inorganic compound may be used independently, and the said material may be mixed and used for arbitrary ratios.

  The metal thin film and inorganic compound film used as the gas barrier layer are only required to have a desired thickness, and may be, for example, a coating (coating) film or a vapor deposition film. Among these, in this embodiment, the gas barrier layer is preferably a vapor deposition film, and particularly preferably an aluminum vapor deposition film, an aluminum oxide vapor deposition film, or a silicon oxide vapor deposition film. This is because these vapor-deposited films have high adhesion to a resin base material to be described later and can exhibit high gas barrier performance when used as a gas barrier layer.

  The thickness of the gas barrier layer is not particularly limited as long as the desired gas barrier performance can be exhibited. Although it depends on the type of the gas barrier layer, it is preferably in the range of 5 nm to 200 nm, for example. Especially, it is preferable that it exists in the range of 10 nm-100 nm. If the thickness of the gas barrier layer is less than the above range, film formation may be insufficient and the desired gas barrier performance may not be exhibited. If the thickness exceeds the above range, cracks are likely to occur and flexibility may be reduced. Alternatively, when the gas barrier layer is a metal thin film, a heat bridge may occur in the vacuum heat insulating material formed using the outer packaging material of this aspect.

  The gas barrier layer may be a single layer, or two or more gas barrier layers may be laminated so that the total thickness is within the above range. When two or more gas barrier layers are used, gas barrier layers having the same composition may be combined, or gas barrier layers having different compositions may be combined. The gas barrier layer may be subjected to surface treatment such as corona discharge treatment from the viewpoint of improving gas barrier performance and adhesion with other layers.

  As a method for forming the gas barrier layer on the resin substrate, a conventionally known method can be used according to the type of the gas barrier layer. If the gas barrier layer is a metal thin film, for example, a method of forming a film on a resin substrate using a dry film forming method such as a physical vapor deposition (PVD) method or a chemical vapor deposition (CVD) method, specifically In this case, a vacuum deposition method using an electron beam (EB) heating method can be used. Moreover, the method of using a ready-made metal thin film and thermocompression bonding the resin base material and the metal thin film heated previously, the method of bonding on a resin base material or a metal thin film through an adhesive layer, etc. are mentioned. On the other hand, if the gas barrier layer is an inorganic compound film, the inorganic compound film can be formed on the resin substrate using, for example, a dry film forming method such as a PVD method or a CVD method. As a specific method for forming a gas barrier layer by the PVD method and the CVD method, for example, a method disclosed in JP 2011-5835 A can be used.

(2) Resin base material The resin base material is not particularly limited as long as it can support the gas barrier layer. For example, a resin film or a resin sheet is preferably used. When the resin substrate is a resin film, the resin film may be unstretched or uniaxially or biaxially stretched. The resin base material may or may not have transparency.

  The resin used for the resin substrate is not particularly limited. For example, a polyolefin resin such as polyethylene or polypropylene, a polyester resin such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polybutylene terephthalate (PBT). , Cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), poly (meth) acrylic resin, polycarbonate resin, ethylene-vinyl ester copolymer and Various resins such as saponified products, polyamide resins such as various nylons, polyimide resins, polyurethane resins, acetal resins, and cellulose resins can be used. In this embodiment, among the above resins, PET, PBT, nylon and the like are more preferably used.

  As described in the above section “1. Characteristics of outer packaging material for vacuum heat insulating material, (7) Dimensional change rate of outer packaging material constituent material”, even if it is the same product called “PET film”, the manufacturing method Therefore, the dimensional change rate at a high temperature differs. In this embodiment, the dimensional change rate due to heat of the PET film used as the resin base material is 1% or less when the ambient temperature is changed from 20 ° C. to 145 ° C. When the temperature is kept at 145 ° C. for 1 hour, the dimensional change rate is 0.5% or less, and the dimensional change rate when the ambient temperature is changed from 145 ° C. to 20 ° C. is within 1% or less. Is preferred. Moreover, it is preferable that the dimensional change rate before and behind the high temperature holding | maintenance of a resin base material is 2% or less. This is because by using such a PET film as a resin substrate, it is possible to suppress the occurrence of cracks in the gas barrier layer when exposed to high temperatures. From the viewpoint as described above, it is preferable that a biaxially stretched polyvinyl alcohol film or an ethylene-vinyl alcohol copolymer (EVOH) resin film is not used for the resin base material. This is because these are films having a high dimensional change rate at a high temperature, in particular, a large shrinkage rate, and thus may increase the dimensional change rate at a high temperature as the entire outer packaging material.

  The resin base material preferably does not contain an ethylene-vinyl alcohol copolymer resin (EVOH resin). This is because, when the dimensions of the resin base material are greatly changed at high temperatures, the gas barrier layer is likely to be deteriorated, and the dimensional stability and gas barrier properties of the outer packaging material against temperature changes may be deteriorated. The detailed reason and the definition that the resin base material does not contain EVOH resin are as described above.

  The resin base material may contain various plastic compounding agents and additives. Examples of the additive include a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing agent, an antistatic agent, a pigment, and a modifying resin.

  The resin base material may be subjected to a surface treatment. This is because the adhesion to the gas barrier layer can be improved. Examples of the surface treatment include oxidation treatment, roughening treatment (roughening treatment), easy adhesion coating treatment and the like disclosed in Japanese Patent Application Laid-Open No. 2014-180837.

  Although the thickness of a resin base material is not specifically limited, For example, it exists in the range of 6 micrometers-200 micrometers, More preferably, it is 9 micrometers-100 micrometers. Further, the resin base material may be a single layer or a multilayer body formed by laminating a plurality of resin layers. In the multilayer body, each resin layer may be composed of different resins or may be composed of the same resin.

(3) Overcoat layer In this aspect, it is preferable that at least one said gas barrier film has an overcoat layer so that the surface side of the said gas barrier layer on the opposite side to the said resin base material may be covered. It is because the gas barrier performance of the gas barrier film can be improved by having the overcoat layer. Such an overcoat layer is not particularly limited, and those generally used as an overcoat agent can be used. For example, a mixed compound containing an organic portion and an inorganic portion can be used as the main component of the overcoat layer.

There are various types of mixed compounds, such as, for example, alumina phosphate based mixed compounds such as Clarista CF (registered trademark) manufactured by Kuraray Co., Ltd., Besera (registered trademark) manufactured by Toppan Printing Co., Ltd. A gas barrier resin composition comprising a zinc acrylate-based mixed compound, a resin and an inorganic layered compound, or a general formula R ¹ _n M (OR ² ) _m (where R ¹ and R ² are the number of carbon atoms) 1 to 8 organic groups, 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 is possible to use a sol-gel compound containing a raw material liquid containing at least one alkoxide and a water-soluble polymer and further polycondensed by a sol-gel method. Examples of the water-soluble polymer include polyvinyl alcohol resins, ethylene-vinyl alcohol copolymers, acrylic acid resins, natural polymer methyl cellulose, carboxymethyl cellulose, cellulose nanofibers, and polysaccharides. Regarding the above-mentioned alumina phosphate mixed compound, Japanese Patent No. 4961044, about the above zinc acrylate mixed compound, Japanese Patent No. 4373797, about the gas barrier resin composition comprising the above resin and inorganic layered compound Since it can be the same as that disclosed in Japanese Patent Laid-Open No. 11-257574, description thereof is omitted here.

In this embodiment, among the mixed compounds, the general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, and M is a metal An atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence of M.) and a polyvinyl alcohol system A compound obtained by polycondensation by a sol-gel method in the presence of, for example, a sol-gel method catalyst, an acid, water, and an organic solvent, which contains a resin and / or an ethylene-vinyl alcohol copolymer; Hereinafter, the “sol-gel compound” may be used as the overcoat layer. This is because the sol-gel compound has a high adhesive strength at the interface and can perform a film-forming process at a relatively low temperature, thereby suppressing deterioration of the resin base material due to heat.

  The mixed compound is applied, for example, on the gas barrier layer of the gas barrier film, and is heat-treated at a temperature within the range of 20 ° C. to 180 ° C. and below the melting point of the resin substrate for 30 seconds to 10 minutes. The overcoat layer can be formed so as to cover the surface of the gas barrier layer opposite to the resin base.

The mixed compound is applied twice or more on the gas barrier layer of the gas barrier film, and heated for 30 seconds to 10 minutes at a temperature within the range of 20 ° C. to 180 ° C. and below the melting point of the resin substrate. Two or more overcoat layers may be formed by treatment.
Hereinafter, the overcoat layer containing the sol-gel compound as a main component will be described in detail.

(A) Metal oxide component of sol-gel compound As the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m , at least one of alkoxide partial hydrolyzate and alkoxide hydrolysis condensate is used. In addition, the partial hydrolyzate of the alkoxide is not limited to those in which all of the alkoxy groups are hydrolyzed, and those in which one or more are hydrolyzed, and mixtures thereof. Further, as the hydrolysis condensate, a dimer or more of a partially hydrolyzed alkoxide, specifically, a dimer or hexamer may be used.

In the general formula R ¹ _n M (OR ² ) _m , R ¹ is an alkyl group having 1 to 8, preferably 1 to 5, more preferably 1 to 4 carbon atoms which may have a branch. For example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group, etc. Can be mentioned.

In the general formula R ¹ _n M (OR ² ) _m , R ² is an alkyl group having 1 to 8 carbon atoms, more preferably 1 to 5, and particularly preferably 1 to 4 which may have a branch. Yes, for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a sec-butyl group, and the like. When a plurality of (OR ² ) are present in the same molecule, (OR ² ) may be the same or different.

Examples of the metal atom represented by M in the general formula R ¹ _n M (OR ² ) _m include silicon, zirconium, titanium, aluminum, and the like. In this embodiment, the metal atom is preferably silicon. In this case, as an alkoxide that can be preferably used in this embodiment, when n = 0 in the general formula R ¹ _n M (OR ² ) _m , the general formula Si (ORa) ₄ (wherein Ra is Represents an alkyl group having 1 to 5 carbon atoms). In the above, Ra includes a methyl group, an ethyl group, an n-propyl group, an n-butyl group, and the like. Specific examples of such an alkoxysilane include tetramethoxysilane Si (OCH ₃ ) ₄ , tetraethoxysilane Si (OC ₂ H ₅ ) ₄ , tetrapropoxysilane Si (OC ₃ H ₇ ) ₄ , tetrabutoxysilane Si ( OC ₄ H ₉₎ can be exemplified ₄ like.

When n is 1 or more, the general formula Rb _n Si (ORc) _4-m (wherein m represents an integer of 1, 2, 3; Rb and Rc are methyl, ethyl, Group, n-propyl group, n-butyl group, etc.) can be used. Examples of such an alkylalkoxysilane include methyltrimethoxysilane CH ₃ Si (OCH ₃ ) ₃ , methyltriethoxysilane CH ₃ Si (OC ₂ H ₅ ) ₃ , dimethyldimethoxysilane (CH ₃ ) ₂ Si (OCH). _{3) 2,} dimethyl diethoxy silane _{(CH 3) 2 Si (OC} 2 H 5) 2, may use other like. In this embodiment, the above alkoxysilane, alkylalkoxysilane, etc. may be used alone or in combination of two or more.

  In this embodiment, a polycondensation product of the above alkoxysilane can also be used. Specifically, for example, polytetramethoxysilane, polytetraethoxysilane, and the like can be used.

In this embodiment, a zirconium alkoxide in which M is Zr can also be suitably used as the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m . For example, tetramethoxy zirconium Zr (OCH _{3) 4,} tetraethoxy zirconium _{Zr (OC 2 H 5) 4} , tetraisopropoxy zirconium _{Zr (iso-OC 3 H 7} ) 4, tetra-n-butoxy zirconium Zr (OC ₄ H _{9) 4} , etc. can be exemplified.

Further, as the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m , a titanium alkoxide in which M is Ti can be preferably used. For example, tetramethoxytitanium Ti (OCH ₃ ) ₄ , tetra Examples include ethoxytitanium Ti (OC ₂ H ₅ ) ₄ , tetraisopropoxytitanium Ti (iso-OC ₃ H ₇ ) ₄ , tetra-n-butoxytitanium Ti (OC ₄ H ₉ ) ₄ , and others.

As the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m , an aluminum alkoxide in which M is Al can be used. For example, tetramethoxyaluminum Al (OCH ₃ ) ₄ , tetraethoxyaluminum _{Al (OC 2 H 5) 4} , tetraisopropoxy aluminum _{Al (iso-OC 3 H 7} ) 4, tetra-n-butoxy aluminum _{Al (OC 4 H 9) 4} , may use other like.

  In this embodiment, the alkoxide may be used in combination of two or more. For example, when alkoxysilane and zirconium alkoxide are mixed and used, the toughness and heat resistance of the resulting overcoat layer can be improved, and a decrease in retort resistance of the film during stretching can be avoided. Under the present circumstances, the usage-amount of a zirconium alkoxide exists in the range of 10 mass parts or less with respect to 100 mass parts of said alkoxysilanes. When the amount exceeds 10 parts by mass, the overcoat layer to be formed is easily gelled, the brittleness of the film is increased, and the overcoat layer tends to peel off when the gas barrier layer is coated. It is not preferable.

  In addition, when alkoxysilane and titanium alkoxide are mixed and used, the thermal conductivity of the resulting overcoat layer is lowered, and the heat resistance is remarkably improved. Under the present circumstances, the usage-amount of a titanium alkoxide exists in the range of 5 mass parts or less with respect to 100 mass parts of said alkoxysilane. If it exceeds 5 parts by mass, the overcoat layer formed becomes brittle, and the overcoat layer may be easily peeled off when the gas barrier layer is coated.

(B) Organic polymer component of sol-gel compound As the polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer used in this embodiment, a polyvinyl alcohol resin or an ethylene / vinyl alcohol copolymer is used individually. Alternatively, a polyvinyl alcohol resin and an ethylene-vinyl alcohol copolymer can be used in combination. As the polyvinyl alcohol resin, those obtained by saponifying polyvinyl acetate can be generally used. Polyvinyl alcohol resins include partially saponified polyvinyl alcohol resins in which several tens of percent of acetic acid groups remain, completely saponified polyvinyl alcohols in which no acetic acid groups remain, or modified polyvinyl alcohol resins in which OH groups have been modified. Well, not particularly limited. In this embodiment, by using a polyvinyl alcohol resin and / or an ethylene-vinyl alcohol copolymer, physical properties such as gas barrier properties, water resistance, weather resistance, and others can be remarkably improved.

  When a polyvinyl alcohol-based resin and an ethylene-vinyl alcohol copolymer are used in combination, the mixing ratio thereof is, as a mass ratio, polyvinyl alcohol-based resin: ethylene-vinyl alcohol copolymer = 10: 0. It is preferably within the range of 05 to 10: 6.

  The content of the polyvinyl alcohol-based resin and / or ethylene-vinyl alcohol copolymer is in the range of 5 to 500 parts by mass, preferably 20 parts by mass with respect to 100 parts by mass of the total amount of the alkoxide. It is a mixture ratio in the range of 200 parts by mass. If it exceeds 500 parts by mass, the brittleness of the overcoat layer increases, and the water resistance and weather resistance of the resulting overcoat layer may be lowered. On the other hand, if it is less than 5 parts by mass, the gas barrier property may be lowered.

  In the polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer, as the polyvinyl alcohol resin, generally obtained by saponifying polyvinyl acetate can be used. Polyvinyl alcohol resins include partially saponified polyvinyl alcohol resins in which several tens of percent of acetate groups remain, completely saponified polyvinyl alcohols in which no acetate groups remain, and modified polyvinyl alcohol resins in which OH groups have been modified. Well, not particularly limited. Examples of such a polyvinyl alcohol resin include “RS-110 (degree of saponification = 99%, degree of polymerization = 1,000)” manufactured by Kuraray Co., Ltd., and “Kuraray Poval LM-20SO ( “Saponification degree = 40%, polymerization degree = 2,000)”, “GOHSENOL NM-14 (degree of saponification = 99%, polymerization degree = 1,400)” manufactured by Nippon Synthetic Chemical Industry Co., Ltd. Can do.

  Moreover, as an ethylene-vinyl alcohol copolymer, the saponification thing of the copolymer of ethylene and vinyl acetate, ie, the thing obtained by saponifying an ethylene-vinyl acetate random copolymer, can be used. For example, it is not particularly limited, and includes a partially saponified product in which several tens mol% of acetic acid groups remain to a complete saponified product in which only several mol% of acetic acid groups remain or no acetic acid groups remain. However, it is preferable to use a saponification degree that is preferably 80 mol% or more, more preferably 90 mol% or more, and still more preferably 95 mol% or more from the viewpoint of gas barrier properties. The content of repeating units derived from ethylene in the ethylene-vinyl alcohol copolymer (hereinafter also referred to as “ethylene content”) is usually in the range of 0 mol% to 50 mol%, preferably 20 mol%. It is preferable to be within a range of ˜45 mol%. As such an ethylene-vinyl alcohol copolymer, “Eval EP-F101 (ethylene content; 32 mol%)” manufactured by Kuraray Co., Ltd., “Soarnol D2908 (ethylene content; 29 mol) manufactured by Nippon Synthetic Chemical Industry Co., Ltd.” %) "And the like.

(C) Others In preparing the raw material liquid for forming the overcoat layer containing the sol-gel compound as a main component, a silane coupling agent or the like may be added.

  As the silane coupling agent that can be suitably used in the present embodiment, known organic reactive group-containing organoalkoxysilanes can be widely used. For example, an organoalkoxysilane having an epoxy group is suitable. For example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β- (3,4-epoxy). (Cyclohexyl) ethyltrimethoxysilane or the like can be used. Such silane coupling agents may be used alone or in combination of two or more. In addition, the usage-amount of a silane coupling agent exists in the range of 1 mass part-20 mass parts with respect to 100 mass parts of said alkoxysilanes. When 20 parts by mass or more is used, the rigidity and brittleness of the overcoat layer to be formed increase, and the insulation and workability of the overcoat layer may be deteriorated.

  The sol-gel catalyst is a catalyst mainly used as a polycondensation catalyst, and a basic substance such as a tertiary amine that is substantially insoluble in water and soluble in an organic solvent is used. . For example, N, N-dimethylbenzylamine, tripropylamine, tributylamine, tripentylamine, etc. can be used. In this embodiment, N, N-dimethylbenzylamine is particularly suitable. The usage-amount is in the range of 0.01 mass part-1.0 mass part per 100 mass parts of total amounts of an alkoxide and a silane coupling agent.

  The “acid” used in the preparation of the sol-gel compound is mainly used as a catalyst for hydrolysis of an alkoxide, a silane coupling agent or the like in the sol-gel method. For example, mineral acids such as sulfuric acid, hydrochloric acid and nitric acid, organic acids such as acetic acid and tartaric acid, and the like can be used. The amount of the acid used is preferably in the range of 0.001 mol to 0.05 mol relative to the total molar amount of the alkoxide and the alkoxide content of the silane coupling agent (for example, silicate moiety).

  Furthermore, in the preparation of the sol-gel compound, water in a proportion within the range of 0.1 mol to 100 mol, preferably within the range of 0.8 mol to 2 mol, with respect to 1 mol of the total molar amount of the alkoxide. Can be used. When the amount of water exceeds 2 mol, the polymer obtained from the alkoxysilane and the metal alkoxide becomes spherical particles, and the spherical particles are three-dimensionally crosslinked to form a porous polymer having a low density, Such a porous polymer cannot improve the gas barrier properties of the overcoat layer. Moreover, when the amount of the water is less than 0.8 mol, the hydrolysis reaction may hardly proceed.

  Furthermore, as an organic solvent used in the preparation of the sol-gel compound, for example, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butanol, and the like can be used. The polyvinyl alcohol-based resin and / or ethylene-vinyl alcohol copolymer is preferably handled in a state of being dissolved in a coating solution containing the alkoxide, silane coupling agent, or the like. You can choose. For example, when a polyvinyl alcohol-based resin and an ethylene-vinyl alcohol copolymer are used in combination, it is preferable to use n-butanol. An ethylene-vinyl alcohol copolymer solubilized in a solvent can also be used. For example, trade name “Soarnol” manufactured by Nippon Synthetic Chemical Industry Co., Ltd. can be preferably used. The amount of the organic solvent used is usually 30 with respect to 100 mass of the total amount of the alkoxide, silane coupling agent, polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer, acid and sol-gel method catalyst. It is in the range of mass parts to 500 mass parts.

(D) Method for forming overcoat layer containing sol-gel compound as main component In this embodiment, the overcoat layer containing the sol-gel compound as a main component can be produced by the following method.
First, an alkoxide such as alkoxysilane, a silane coupling agent, a polyvinyl alcohol resin and / or an ethylene-vinyl alcohol copolymer, a sol-gel method catalyst, an acid, water, an organic solvent, and, if necessary, A metal alkoxide etc. are mixed and a raw material liquid is prepared. By mixing, the raw material liquid (coating liquid) starts and proceeds with a polycondensation reaction.

  Next, the raw material liquid is applied onto the gas barrier layer of the gas barrier film by a conventional method and dried. By this drying step, polycondensation of the alkoxide such as alkoxysilane, metal alkoxide, silane coupling agent, polyvinyl alcohol resin and / or ethylene-vinyl alcohol copolymer further proceeds, and a coating film is formed. . On the first coating film, the above coating operation may be further repeated to form a plurality of coating films composed of two or more.

  Next, the resin base material coated with the raw material liquid is 0.05 minutes at a temperature within the range of 50 ° C. to 300 ° C. and below the melting point of the resin base material, preferably within the range of 70 ° C. to 200 ° C. Heat for ~ 60 minutes. As a result, a gas barrier film in which one or more overcoat layers of the raw material liquid are formed on the gas barrier layer can be manufactured.

  An overcoat layer obtained using an ethylene-vinyl alcohol copolymer alone or a mixed composition of a polyvinyl alcohol-based resin and an ethylene-vinyl alcohol copolymer is excellent in gas barrier properties after hydrothermal treatment. On the other hand, when an overcoat layer mainly composed of a polyvinyl alcohol-based resin is provided, an overcoat layer containing an ethylene-vinyl alcohol copolymer is laminated on the overcoat layer. It is possible to improve the gas barrier property.

  Further, both or any of an overcoat layer mainly composed of an ethylene-vinyl alcohol copolymer and an overcoat layer mainly composed of a mixed composition of a polyvinyl alcohol resin and an ethylene-vinyl alcohol copolymer. Even if a plurality of these are laminated, it becomes an effective means for improving the gas barrier performance of the gas barrier film.

  Since the more detailed manufacturing method of the overcoat layer can be the same as that disclosed in Japanese Patent No. 5568897, description thereof is omitted here.

(E) Others As described above, the overcoat layer may contain an EVOH resin, but preferably does not contain an EVOH resin. This is because the dimensions of the overcoat layer are likely to change greatly due to temperature changes, and the dimensional stability of the outer packaging material may be reduced, and the gas barrier performance may be deteriorated due to deterioration of the gas barrier layer. The detailed reason is as described above. Note that the overcoat layer does not contain EVOH resin includes not only the case where the overcoat layer contains no EVOH resin but also the case where the overcoat layer does not contain EVOH resin as a main component. The content of the EVOH resin is as described above.

(4) Gas barrier film As the gas barrier performance of the above gas barrier film alone (one), the oxygen permeability is preferably 0.1 cc / (m ² · day · atm) or less, especially 0.05 cc / (m ² · Day · atm) or less. It is preferable that the steam permeability is 0.1g ^/ (m 2 · day) or less, is preferably Among them, 0.05g ^/ (m 2 · day) or less. When the oxygen and water vapor permeability of the gas barrier film is within the above-described range, it is possible to make it difficult for moisture, gas, or the like that has permeated from the outside to penetrate into the core material inside the vacuum heat insulating material. Moreover, the gas barrier performance as an outer packaging material can be further improved by using a plurality of gas barrier films having such gas barrier performance. The oxygen permeability and water vapor permeability can be measured by the same method as described in the above section “1. Characteristics of vacuum insulation outer packaging material”.

  In this aspect, the outer packaging material preferably has two or more gas barrier films as described above. This is because the gas barrier performance of the outer packaging material can be further improved. When the outer packaging material has two or more gas barrier films, the structure of each gas barrier film may be the same or different, such as the material of the gas barrier layer of the gas barrier film, the material of the resin base material, and the presence or absence of the overcoat layer. A plurality of gas barrier films having the same functions and characteristics may be used, and by using gas barrier films having different functions and characteristics in an arrangement corresponding to each function and characteristics, the functions and characteristics of each gas barrier film are used. Can be demonstrated.

  For example, when the outer packaging material has two gas barrier films and a resin base material of ethylene-vinyl alcohol copolymer (EVOH) is used, when the EVOH resin base material is a vacuum heat insulating material, It is preferable that the gas barrier film is disposed inside the other gas barrier film. EVOH has a very low oxygen permeability, but a relatively high water vapor permeability, and the oxygen barrier performance of the EVOH is easily deteriorated by water vapor. Therefore, the oxygen barrier performance of EVOH can be exhibited more by arranging another gas barrier film outside the vacuum heat insulating material to limit the amount of water vapor reaching EVOH. In addition, it is preferable that an ethylene-vinyl alcohol copolymer (EVOH) and a polyvinyl alcohol-type film are not used for the said gas barrier film from a viewpoint of the dimensional change rate in high temperature, especially shrinkage | contraction rate. In addition, that an ethylene-vinyl alcohol copolymer (EVOH) is not used for the said gas barrier film means that a gas barrier film does not contain ethylene-vinyl alcohol copolymer (EVOH) resin.

  Further, the order of the resin base material and the gas barrier layer is not particularly limited, and may be appropriately set according to the layer configuration of each layer other than the gas barrier film, the number of the gas barrier films, etc. used together with the outer packaging material. it can. For example, as illustrated in FIG. 1, the gas barrier layer 4 may be disposed inside the resin base material 3 when the vacuum heat insulating material is formed using the outer packaging material 10. That is, the outer packaging material 10 of this embodiment has a film 1 and a gas barrier film 2 that can be thermally welded, and has a gas barrier layer 4 and a resin base material 3 in this order from the side of the film 1 to which the gas barrier film 2 can be thermally welded. You may do it. Moreover, as illustrated in FIG. 3A, when the outer packaging material 10 includes the protective film 5, the gas barrier layer 4 may be disposed outside the resin base material 3. That is, the outer packaging material 10 of this aspect is opposite to the heat-weldable film 1, the gas barrier film 2 disposed on one surface of the heat-weldable film 1, and the heat-weldable film 1 of the gas barrier film 2. A protective film 5 disposed on the side surface, and the resin base material 3 and the gas barrier layer 4 may be provided in this order from the film 1 side on which the gas barrier film 2 can be thermally welded.

  When the outer packaging material 10 has two or more gas barrier films 2, as illustrated in FIG. 3B, the gas barrier layers 4 of two adjacent gas barrier films may be arranged so as to face each other. As shown in FIG. 3C, both gas barrier layers 4 of two adjacent gas barrier films may be disposed inside the resin base material 3, as shown in FIG. As illustrated, both gas barrier layers 4 of two adjacent gas barrier films may be disposed outside the resin substrate 3.

That is, as shown in FIG. 3 (b), the outer packaging material 10 of this embodiment includes a heat-weldable film 1, a first gas barrier film 2 a disposed on one surface of the heat-weldable film 1, The second gas barrier film 2b disposed on the opposite side of the heat-weldable film 1 of the 1 gas barrier film 2a and the protection disposed on the opposite side of the second gas barrier film 2b from the first gas barrier film 2a The first gas barrier film 2a has the resin base material 3 and the gas barrier layer 4 in this order from the thermally weldable film 1 side, and the second gas barrier film 2b is a thermally weldable film. You may have the gas barrier layer 4 and the resin base material 3 in this order from the 1 side.
Moreover, as shown in FIG.3 (c), the outer packaging material 10 of this aspect is the film 1 which can be heat-welded, the 1st gas barrier film 2a arrange | positioned on one surface of the film 1 which can be heat-welded, The second gas barrier film 2b disposed on the opposite side of the heat-weldable film 1 of the 1 gas barrier film 2a and the protection disposed on the opposite side of the second gas barrier film 2b from the first gas barrier film 2a The first gas barrier film 2a has the gas barrier layer 4 and the resin base material 3 in this order from the thermally weldable film 1 side, and the second gas barrier film 2b is a thermally weldable film. You may have the gas barrier layer 4 and the resin base material 3 in this order from the 1 side.
Further, as shown in FIG. 3 (d), the outer packaging material 10 of this embodiment includes a heat-weldable film 1, a first gas barrier film 2a disposed on one surface of the heat-weldable film 1, and a first 2nd gas barrier film 2b arrange | positioned on the surface on the opposite side to the heat-weldable film 1 of the gas barrier film 2a, and the protective film arrange | positioned on the surface on the opposite side to the 1st gas barrier film 2a of the 2nd gas barrier film 2b. 5, the first gas barrier film 2 a has the resin base material 3 and the gas barrier layer 4 in this order from the thermally weldable film 1 side, and the second gas barrier film 2 b is the thermally weldable film 1. The resin base material 3 and the gas barrier layer 4 may be provided in this order from the side.

  From the viewpoint of protecting the gas barrier layer 4 when the gas barrier film 2c is disposed in the outermost layer of the vacuum heat insulating material as illustrated in FIGS. 3 (e) and 3 (f). The outermost gas barrier film 2 c is preferably arranged so that the gas barrier layer 4 is inside the resin base material 3.

That is, as shown in FIG. 3 (e), the outer packaging material 10 of this aspect includes a heat-weldable film 1, a first gas barrier film 2a disposed on one surface of the heat-weldable film 1, and a first The first gas barrier film 2a is disposed on the surface opposite to the thermally weldable film 1, and the second gas barrier film 2b is disposed on the surface opposite to the first gas barrier film 2a. 3 gas barrier film 2c, first gas barrier film 2a has resin base material 3 and gas barrier layer 4 in this order from the thermally weldable film 1 side, and second gas barrier film 2b can be thermally welded. The gas barrier layer 4 and the resin base material 3 are provided in this order from the film 1 side, and the third gas barrier film 2c is formed of the gas barrier layer 4 and the resin base material from the thermally weldable film 1 side. Door may have in this order.
In addition, as shown in FIG. 3 (f), the outer packaging material 10 of this aspect includes a heat-weldable film 1, a first gas barrier film 2 a disposed on one surface of the heat-weldable film 1, The first gas barrier film 2a is disposed on the surface opposite to the thermally weldable film 1, and the second gas barrier film 2b is disposed on the surface opposite to the first gas barrier film 2a. 3 gas barrier film 2c, first gas barrier film 2a has gas barrier layer 4 and resin base material 3 in this order from the heat-weldable film 1 side, and second gas barrier film 2b can be heat-welded. The gas barrier layer 4 and the resin base material 3 are provided in this order from the film 1 side, and the third gas barrier film 2c includes the gas barrier layer 4 and the resin base material 3 from the thermally weldable film 1 side. It may have in this order.
Note that the outermost gas barrier film can function as a protective film in the outer packaging material of this embodiment.

It is preferable that the outer packaging material of this aspect has a resin base material and a gas barrier layer in this order from the film side which can be heat-welded especially the gas barrier film which contact | connects one surface of the film which can be heat-welded. Because the heat-weldable film and the resin base material are in contact with each other, the stress on the gas barrier layer is buffered by the resin base material due to the thermal deformation of the heat-weldable film, resulting in a dimensional change due to heat of the heat-weldable film. This is because it is possible to suppress the deterioration of the gas barrier layer.
In addition, the outer packaging material of this aspect includes a heat-weldable film, a first gas barrier film disposed on one surface of the heat-weldable film, and a heat-weldable film on the opposite side of the first gas barrier film. A first gas barrier film having a resin base material and a gas barrier layer in this order from the thermally weldable film side, and the second gas barrier film is thermally welded. It is preferable to have a gas barrier layer and a resin base material in this order from the possible film side. When an external stress occurs, if the resin base material of the first gas barrier film and the resin base material of the second gas barrier film are different, the stress related to the gas barrier layer of the first gas barrier film and the gas barrier layer of the second gas barrier film Since the stress is different, the deterioration of both gas barrier layers may be more likely to occur. Further, when the resin base material of one gas barrier film is interposed between the gas barrier layer of the first gas barrier film and the gas barrier layer of the second gas barrier film, due to the dimensional change due to the thermal stress of the interposed resin base material, There is a possibility that the gas barrier layer of the gas barrier film is more easily deteriorated. On the other hand, the arrangement mode in which the gas barrier layers of both gas barrier films are in contact (opposite) can suppress deterioration of the gas barrier layer due to external stress, and the resin base material is disposed between both gas barrier layers. Since it does not intervene, it is possible to suppress the influence of the stress due to the dimensional change due to the thermal stress of the intervening resin substrate and the deterioration of the gas barrier layer.

  FIG. 3 is a schematic cross-sectional view showing another example of the outer packaging material of this aspect. When forming a vacuum heat insulating material, normally, two outer packaging materials are arrange | positioned so that each film 1 which can be heat-welded faces each other. The outer packaging material 10 illustrated in FIGS. 1 and 3 described above has the heat-weldable film 1 disposed in the lowermost layer. Therefore, when a vacuum heat insulating material is formed, the lower layer in these drawings. Is inside the vacuum heat insulating material, and the upper layer is arranged outside the vacuum heat insulating material.

3. Heat-weldable film The heat-weldable film in this aspect is a part which contacts a core material when forming a vacuum heat insulating material using the said outer packaging material. Moreover, it is a site | part which forms the heat welding surface which heat-welds the edge part of the outer packaging materials which oppose.

The material of the heat-weldable film is preferably a thermoplastic resin because it can be melted and fused by heating. For example, linear short-chain branched polyethylene (LLDPE), high-density polyethylene (HDPE) Polyolefin resins such as polyethylene and unstretched polypropylene (CPP), etc., polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyvinyl acetate resins, polyvinyl chloride Resin, poly (meth) acrylic resin, urethane resin, polyvinyl alcohol resin and ethylene-vinyl alcohol copolymer (EVOH) resin, polyphenylene sulfide (PPS) resin, tetrafluoroethylene (C ₂ F ₄ ) -ethylene ( C ₂ H ₄ ) Copolymer (ETFE) resin and the like.

  In this aspect, it can select from said resin suitably according to the preset melting | fusing point of the film in which heat welding is possible. For example, linear short-chain branched polyethylene (LLDPE) has high versatility and can be thermally welded at a relatively low temperature. However, since LLDPE has a low melting point, the gas barrier film may be deteriorated due to heat. In addition, a resin having a melting point of 145 ° C. or higher such as PP resin, EVOH resin, PET resin, PBT resin, ETFE resin, or PPS resin has a melting point of 145 ° C. or higher. Since it can be set, it is possible to prevent thermal deterioration of the heat-weldable film, and to obtain a vacuum heat insulating material that can withstand use in a higher temperature environment.

  In addition, although it depends on the use environment temperature of the outer packaging material, ethylene-vinyl alcohol copolymer (EVOH) is not used for the heat-weldable film from the viewpoint of dimensional change rate at high temperature, particularly shrinkage rate. Is preferred. That is, it is preferable that the heat-weldable film does not contain EVOH resin. This is because the size of the film that can be heat-welded due to a temperature change is greatly changed, so that the gas barrier layer is likely to be deteriorated, and the dimensional stability and gas barrier property of the outer packaging material against the temperature change may be deteriorated. The detailed reason and details of “not including EVOH resin” are as described above.

  The melting point of the heat-weldable film is preferably 50 ° C. or higher, more preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and particularly preferably 145 ° C. or higher. The melting point is preferably 300 ° C. or lower, more preferably 290 ° C. or lower, more preferably 280 ° C. or lower.

  The melting point of the heat-weldable film is preferably, for example, in the range of 50 ° C. to 300 ° C., more preferably in the range of 80 ° C. to 250 ° C., and particularly in the range of 100 ° C. to 200 ° C. preferable. If the melting point of the heat-weldable film is less than the above range, the sealing surface of the outer packaging material may be peeled off in the usage environment of the vacuum heat insulating material formed using the outer packaging material of this aspect. In addition, if the melting point of the heat-weldable film exceeds the above range, it is necessary to heat-weld the outer packaging material at a high temperature, so that the gas barrier film and protective film used together as the outer packaging material may be deteriorated due to heat. There is.

  The heat-weldable film has a melting point of 145 ° C. or higher, so that the heat-weldable film itself is thermally deteriorated and changes in dimensions even when the outer packaging material of this embodiment is exposed to a high temperature environment for a long time. It is possible to suppress the dimensional change of the entire outer packaging material due to the dimensional change of the heat-weldable film. Furthermore, the higher the melting point of the heat-weldable film, the more the peeling of the sealing surface due to exposure to the ambient environmental temperature when the outer packaging material of this embodiment is used for manufacturing a vacuum heat insulating material. For this reason, the vacuum heat insulating material which can endure the use in a higher temperature environment can be obtained. As melting | fusing point of the said heat weldable film set from such a viewpoint, it can be set, for example in the range of 145 degreeC-300 degreeC, The range of 145 degreeC-290 degreeC, The range of 145 degreeC-280 degreeC Can be inside.

  The melting point of the heat-weldable film in the outer packaging material can be measured by the following method. First, a heat-weldable film is peeled off from the outer packaging material to obtain a measurement sample of about 10 mg. This measurement sample was put in an aluminum cell, and the temperature was raised from 20 ° C. to 20 ° C. at a heating rate of 10 ° C./min under a nitrogen atmosphere using a differential scanning calorimeter (DSC204 manufactured by NETZSCH). Hold for 10 minutes. Furthermore, after cooling to 20 ° C. at a temperature lowering rate of 10 ° C./min and holding at that temperature for 10 minutes, the temperature is raised again to 300 ° C. at a temperature rising rate of 10 ° C./min (second temperature increase). The intersection of the tangent at the melting point observed at the second temperature rise and the baseline of the DSC curve on the lower temperature side than the melting point can be the melting point of the heat-weldable film.

  The heat-weldable film may contain other materials such as an antiblocking agent, a lubricant, a flame retardant, and an organic filler in addition to the above-described resin.

  The thickness of the heat-weldable film is preferably in the range of 20 μm to 100 μm, for example, preferably in the range of 25 μm to 90 μm, and particularly preferably in the range of 30 μm to 80 μm. When the thickness of the heat-weldable film is larger than the above range, the gas barrier performance of the outer packaging material may be deteriorated. When the thickness is smaller than the above range, a desired adhesive force may not be obtained.

4). Protective film The outer packaging material of this embodiment preferably has a protective film in addition to the heat-weldable film and the gas barrier film. The arrangement position of the protective film in the outer packaging material is not particularly limited, but the outermost layer (outermost layer) is formed when forming the vacuum heat insulating material such as the surface of the gas barrier film opposite to the heat-weldable film. It is preferable that a protective film is disposed at a position to be a surface layer.

  The protective film may be any film using a resin having a higher melting point than a heat-weldable film, and may be in the form of a sheet or film. As such a protective film, for example, a sheet or film comprising a nylon resin, a polyester resin, a polyamide resin, a polypropylene resin, or the like as a constituent material can be given. Among them, as a constituent material of the protective film, a nylon resin or PET, in particular nylon resin, is preferably used.

  As described in the section of “1. Characteristics of outer packaging material for vacuum heat insulating material, (7) Dimensional change rate of outer packaging material constituent material”, even if it is a product called the same “nylon film”, the manufacturing method Therefore, the dimensional change rate at a high temperature differs. In this embodiment, when the nylon film is used as a protective film, the dimensional change rate due to heat of the nylon film is 2% or less when the ambient temperature is changed from 20 ° C. to 145 ° C. The dimensional change rate when the atmosphere temperature is held at 145 ° C. for 1 hour is 0.5% or less, and the dimensional change rate when the atmosphere temperature is changed from 145 ° C. to 20 ° C. is 0.5% or less. It is preferable to be within the range. Further, the dimensional change rate before and after holding at high temperature is preferably 2% or less. This is because by using such a nylon film as a protective film, cracks in the nylon film itself can be suppressed when exposed to high temperatures.

  Moreover, it is preferable that an ethylene-vinyl alcohol copolymer (EVOH) is not used for the said protective film. That is, it is preferable that the protective film does not contain EVOH resin. This is because EVOH resin is a material having a high dimensional change rate at a high temperature, in particular, a large shrinkage rate, and thus may increase the dimensional change rate at a high temperature as the entire outer packaging material. Moreover, it is because the gas barrier performance of the whole outer packaging material may deteriorate due to the deterioration of the gas barrier layer due to the protective film containing the EVOH resin. The detailed reason and details of “not including EVOH resin” are as described above.

  When a PET film is used for the protective film, the PET having a dimensional change rate within a preferable range listed as a dimensional change rate at a high temperature in the section “2. Gas barrier film, (2) Resin substrate”. Preferably a film is used.

  The protective film has sufficient strength to protect the inside of the vacuum heat insulating material when the vacuum heat insulating material is formed using the outer packaging material of this aspect, and has heat resistance, pin hole resistance, and puncture resistance. It is preferable that it is excellent in property etc. The protective film preferably has gas barrier performance such as oxygen barrier performance and water vapor barrier performance. Such gas barrier performance may be exhibited by a resin film or the like used for the protective film, or may be exhibited by a film having gas barrier performance formed on the resin film. As the film having the gas barrier performance, the same film as the gas barrier layer and the overcoat layer described in the section “2. Gas barrier film” can be used.

  The protective film may be a single layer or may be a multilayer formed by laminating layers made of the same material or layers made of different materials. The protective film may be subjected to a surface treatment such as a corona discharge treatment from the viewpoint that the adhesion with other layers can be improved.

  Although the thickness of the said protective film will not be specifically limited if it is the thickness which can protect the film and gas barrier film which can be thermally welded, Generally it is a grade in the range of 5 micrometers-80 micrometers.

The protective film may have a gas barrier layer on one surface. That is, the protective film may be a gas barrier film having a resin base material and a gas barrier layer disposed on one surface of the resin base material. This is because the gas barrier performance of the protective film alone can be improved by having such a configuration. The gas barrier layer may be the same as the gas barrier layer described in the above section “2. Gas barrier film”.
In the outer packaging material of this aspect, when a protective film having a gas barrier layer on one surface is used, the protective film is such that the surface of the protective film on which the gas barrier layer is disposed is the heat-weldable film side. Preferably they are arranged.

5. The outer packaging material for vacuum heat insulating material The thickness of the outer packaging material is not particularly limited as long as desired gas barrier performance and strength can be obtained. For example, it may be in the range of 30 μm to 200 μm. Among them, it is preferable that the thickness is in the range of 50 μm to 150 μm. Further, the tensile strength of the outer packaging material is preferably 50 N or more, and more preferably 80 N or more. This is because breakage or the like is less likely to occur when the vacuum heat insulating material formed using the outer packaging material of this aspect is bent. The tensile strength is a value measured based on JIS Z1707.

  The method for laminating the outer packaging material is not particularly limited as long as an outer packaging material having a desired configuration can be obtained, and a known method can be used. For example, a dry lamination method in which the layers formed in advance are bonded using the above-described interlayer adhesive, and each material of the heat-melted gas barrier film is extruded and bonded using a T-die or the like, and the obtained lamination Examples include a method of bonding a heat-weldable film to the body via an interlayer adhesive.

(A-2) 2nd aspect Hereinafter, the outer packaging material for vacuum heat insulating materials of the 2nd aspect in this invention is demonstrated.
The outer packaging material for vacuum heat insulating material of this aspect is an outer packaging material for vacuum heat insulating material having a heat-weldable film and a gas barrier film, and the gas barrier film includes a resin base material and at least one surface of the resin base material A water vapor permeability of the outer packaging material for a vacuum heat insulating material in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH is 0.01 g / (m ² · day) or less. The oxygen permeability of the outer packaging material for a vacuum heat insulating material in an atmosphere of a temperature of 100 ° C. and a humidity of 0% RH is 0.05 cc / (m ² · day · atm) or less, and stored in an atmosphere at a temperature of 145 ° C. for 500 hours. The amount of deterioration of water vapor permeability of the above-described outer packaging material for vacuum heat insulating material is 0.01 g / (m ² · day) or less.

  In this aspect, the water vapor permeability and oxygen permeability of the outer packaging material are within a specific range, and the deterioration amount of the water vapor permeability after high temperature storage is within a specific range, so that high gas barrier performance is achieved even at high temperatures. It can be set as the outer packaging material which can be maintained. Therefore, the outer packaging material can form a vacuum heat insulating material that can maintain the heat insulating performance for a long time even at a high temperature.

  The above “deterioration amount of water vapor permeability of the outer packaging material after storing for 500 hours in an atmosphere at a temperature of 145 ° C.”, that is, the deterioration amount of water vapor permeability after high temperature storage, The water vapor permeability of the outer packaging material not manufactured and stored in the high temperature atmosphere as compared with the water vapor permeability of the outer packaging material not manufactured and stored in the high temperature atmosphere. For the measurement method and more preferable values, the above-mentioned “(A-1) First aspect, 1. Characteristics of vacuum insulation material outer packaging material, (4) Vacuum insulation material packaging material” This is the same as the description of the “deterioration amount of water vapor permeability”, and the description is omitted here. Moreover, about the water vapor permeability of the said outer packaging material, description of said "(A-1) 1st aspect 1. The characteristic of the outer packaging material for vacuum heat insulating materials, (2) Water vapor permeability of the outer packaging material for vacuum heat insulating materials". As for the oxygen permeability of the outer packaging material, the description of “(A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (3) Oxygen permeability of outer packaging material for vacuum heat insulating material”. The description is omitted here.

In this embodiment, the oxygen permeability deterioration amount of the outer packaging material after storage for 500 hours in an atmosphere at a temperature of 145 ° C., that is, the oxygen permeability deterioration amount after high temperature storage is 0.1 cc / (m ² · day). -Preferably atm) or less. Outer packaging materials whose oxygen permeability deterioration amount after storage at high temperature is within the above range can maintain low oxygen permeability even when exposed to high temperature environments, so long-term insulation performance even in high temperature environments It is because it can be set as the outer packaging material which can form the vacuum heat insulating material which can maintain this. Degradation amount of oxygen permeability after high-temperature storage is as follows: oxygen permeability after high-temperature storage of the outer packaging material is compared with oxygen permeability of outer packaging material that is not stored in a high-temperature atmosphere. The amount of increase from the oxygen permeability of the outer packaging material that has not been prepared and stored in a high-temperature atmosphere, and the measurement method, more preferable values, and the like are described above in “(A-1)”. Since it is the same as the description of "1st aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, and (5) Deterioration amount of oxygen permeability of outer packaging material for vacuum heat insulating material", description here is omitted.

  About each layer which comprises the outer packaging material of this aspect, such as the said heat weldable film and a gas barrier film, since it is the same as that of the description of said (A-1) 1st aspect, description here is abbreviate | omitted.

B. Next, the vacuum heat insulating material of the present invention will be described. The vacuum heat insulating material according to the first aspect of the present invention is a vacuum heat insulating material having a core material and an outer packaging material for vacuum heat insulating material that encloses the core material, and the outer packaging material for vacuum heat insulating material can be thermally welded. The gas barrier film has a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material, and the atmosphere temperature is 20 ° C. Based on the dimensions of the outer packaging material for vacuum heat insulating material, the temperature of the atmosphere was changed from 20 ° C. to 145 ° C., the temperature of the atmosphere was held at 145 ° C. for 1 hour, and then the temperature of the atmosphere was changed to 145 ° C. The dimensional change rate of the outer packaging material for a vacuum heat insulating material when changed from 1 to 20 ° C. is 1% or less.

The vacuum heat insulating material according to the second aspect of the present invention is a vacuum heat insulating material having a core material and an outer packaging material for vacuum heat insulating material that encloses the core material. A gas barrier film having a weldable film and a gas barrier film, the gas barrier film having a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material, temperature 40 ° C., humidity 90% RH Of the outer packaging material for a vacuum heat insulating material in an atmosphere of the above is 0.01 g / (m ² · day) or less, and the outer packaging material for a vacuum heat insulating material in an atmosphere at a temperature of 100 ° C. and a humidity of 0% RH. The oxygen permeability is 0.05 cc / (m ² · day · atm) or less, and the amount of deterioration of the water vapor permeability of the outer packaging material for vacuum heat insulating material after being stored in an atmosphere at a temperature of 145 ° C. for 500 hours is 0.01 g. / (M ² · day) or less It is characterized by.

  About the vacuum heat insulating material of this invention, it can be set to be the same as that of what was already illustrated in FIG. According to the present invention, the vacuum heat insulating material envelope can be a vacuum heat insulating material capable of maintaining heat insulating performance for a long period of time even at high temperatures because the vacuum heat insulating material outer packaging material is the above-described vacuum heat insulating material outer packaging material.

The vacuum heat insulating material of the present invention has at least a vacuum heat insulating material envelope and a core material.
Hereinafter, the vacuum heat insulating material of this invention is demonstrated for every structure.

1. Vacuum insulation material outer packaging material The vacuum insulation material outer packaging material of the present invention encloses the core material. Moreover, the said outer packaging material for vacuum heat insulating materials is the above-mentioned outer packaging material for vacuum heat insulating materials of this invention. About the outer packaging material for such a vacuum heat insulating material, the content described in the section “(A-1) first aspect” or “(A-2) second aspect” of “A. outer packaging material for vacuum heat insulating material”. The description here is omitted. In addition, enclosing means sealing inside the bag formed using the said outer packaging material.

2. Core material The core material in this invention is enclosed with the said outer packaging material for vacuum heat insulating materials. The core material preferably has a low thermal conductivity. The core material is preferably a porous material having a porosity of 50% or more, particularly 90% or more.

As a material constituting the core material, powder, foam, fiber, or the like can be used.
The powder may be either inorganic or organic, and for example, dry silica, wet silica, agglomerated silica powder, conductive powder, calcium carbonate powder, perlite, clay, talc and the like can be used. Among these, a mixture of dry silica and conductive powder is advantageous when used in a temperature range in which an increase in internal pressure occurs because deterioration in heat insulation performance associated with an increase in internal pressure of the vacuum heat insulating material is small. Furthermore, when a substance having a small infrared absorptance such as titanium oxide, aluminum oxide or indium-doped tin oxide is added as a radiation suppressing material to the above-described material, the infrared absorptivity of the core material can be reduced.

  Examples of the foam include urethane foam, styrene foam, phenol foam, and the like. Among these, a foam that forms open cells is preferable.

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

  The core material may be the above-mentioned material alone or a composite material in which two or more materials are mixed.

3. Vacuum heat insulating material The vacuum heat insulating material of this invention seals the inside enclosed with the said outer packaging material for vacuum heat insulating materials under reduced pressure, and makes it a vacuum state. The degree of vacuum inside the vacuum heat insulating material is preferably 5 Pa or less. By setting the degree of vacuum inside the vacuum heat insulating material within the above range, heat conduction due to convection of air remaining inside can be reduced, and excellent heat insulation can be exhibited.

Moreover, it is preferable that the heat conductivity of the said vacuum heat insulating material is low, for example, it is preferable that the heat conductivity (initial heat conductivity) in 25 degreeC of the said vacuum heat insulating material is 5 mW / m * K or less. It is preferably 4 mW / m · K or less, and particularly preferably 3 mW / m · K or less. This is because by setting the heat conductivity of the vacuum heat insulating material within the above range, the vacuum heat insulating material is less likely to conduct heat to the outside, and therefore, a high heat insulating effect can be achieved. In addition, the said thermal conductivity is based on JIS A1412-2: 1999 (The measuring method of the thermal resistance and thermal conductivity of a heat insulating material-2nd part: Heat flow meter method (HFM method)), and a thermal conductivity measuring apparatus The value measured by the heat flow meter method can be used. Examples of the thermal conductivity measuring device include a thermal conductivity measuring device Auto Lambda (product name: HC-074, manufactured by Eihiro Seiki Co., Ltd.). The measurement is performed under the following conditions so that both main surfaces of the measurement sample are directed in the vertical direction. Before measuring the thermal conductivity, it is preferable to measure in advance using a heat flow meter or the like whether the temperature of the measurement sample is equal to the measurement environment temperature. Under one condition, at least three samples are measured, and the average of the measured values is taken as the thermal conductivity value of the condition.
(Measurement conditions for thermal conductivity)
・ Measurement sample: width 29 ± 0.5cm, length 30 ± 0.5cm
・ Time required for steady state of test: 15 minutes or more ・ Type of standard plate: EPS
・ Hot surface temperature: 30 ℃
・ Cold surface temperature: 10 ℃
-Average temperature of measurement sample: 20 ° C

  The vacuum heat insulating material preferably has high gas barrier performance. This is because it is possible to prevent a decrease in the degree of vacuum due to intrusion of moisture, oxygen, and the like from the outside. Regarding the gas barrier performance of the vacuum heat insulating material, the oxygen permeability described in the above-mentioned sections of “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material”. Since it is the same as the water vapor transmission rate, description thereof is omitted here.

4). Manufacturing method As a manufacturing method of the vacuum heat insulating material of the present invention, a general method can be used. For example, the outer packaging material of the present invention described above is prepared in advance, the two outer packaging materials are opposed to each other so that the respective heat-weldable films face each other, and the core material is disposed between them, and a bag making machine or the like A bag body in which one of the outer peripheries of the core material is used as an opening and the end portions of the remaining three outer packaging materials are thermally welded to form the two outer packaging materials, and the core material is disposed inside And then mounting the bag body on a vacuum sealing machine and sealing the opening in a state where the internal pressure of the bag body is reduced, whereby the core material is sealed with the outer packaging material. A heat insulating material is obtained.

  In addition, the above manufacturing method is such that one outer packaging material is opposed so that a heat-weldable film faces the inside, and the core material is arranged therebetween, and one of the outer circumferences of the core material is placed by a bag making machine or the like. By forming the opening and thermally welding the ends of the remaining two outer packaging materials, a bag body is prepared which is formed of one outer packaging material and in which the core material is arranged, and then The bag body is attached to a vacuum sealing machine, and the opening is sealed in a state in which the internal pressure of the bag body is reduced, thereby obtaining a vacuum heat insulating material in which the core material is sealed with the outer packaging material. May be.

5. Applications The vacuum heat insulating material of the present invention has low thermal conductivity and is excellent in heat insulating properties and durability even at high temperatures. Therefore, the said vacuum heat insulating material can be used for the site | part which has a heat source and generate | occur | produces heat | fever, or the site | part which becomes high temperature by being heated from the outside. Applications of the present invention include, for example, articles, equipment, cooler boxes, transport containers, fuel tanks such as hydrogen, system baths, hot water tanks, heat insulation boxes, residential walls, and the like described in “C. Examples include automobiles, airplanes, ships, trains and the like.

C. Next, the article with a vacuum heat insulating material of the present invention will be described. The article with a vacuum heat insulating material according to the first aspect of the present invention is an article with a heat insulating region and an article with a vacuum heat insulating material provided with a vacuum heat insulating material, wherein the vacuum heat insulating material encloses the core material and the core material. A vacuum insulation material packaging material, the vacuum insulation material packaging material includes a heat-weldable film and a gas barrier film, and the gas barrier film comprises at least one of a resin base material and the resin base material. Gas barrier layer disposed on the surface side of the substrate, and when the atmosphere temperature is 20 ° C., the atmosphere temperature is from 20 ° C. to 145 ° C. After changing the temperature of the atmosphere to 145 ° C. for 1 hour, the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less. Characterized by A.

Moreover, the article with a vacuum heat insulating material of the second aspect of the present invention is an article with a heat insulating region and an article with a vacuum heat insulating material provided with the vacuum heat insulating material, wherein the vacuum heat insulating material includes a core material and the core material. An outer packaging material for a vacuum heat insulating material that encloses the gas, and the outer packaging material for a vacuum heat insulating material includes a heat-weldable film and a gas barrier film, and the gas barrier film includes a resin base material and a resin base material. A gas barrier layer disposed on at least one surface side, and a water vapor permeability of the outer packaging material for a vacuum heat insulating material in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH is 0.01 g / (m ² · day) The oxygen permeability of the outer packaging material for vacuum heat insulating material in an atmosphere of temperature 100 ° C. and humidity 0% RH is 0.05 cc / (m ² · day · atm) or less, and in an atmosphere of temperature 145 ° C. The above true after 500 hours storage It is characterized in that the deterioration amount of the water vapor permeability of the heat-insulating material for outer material is 0.01g / (m 2 · ^day) or less.

  According to the present invention, the vacuum heat insulating material provided in the article is a vacuum heat insulating material using the outer packaging material described in the section of “A. Outer packaging material for vacuum heat insulating material”, and maintains the heat insulating performance for a long time even at a high temperature. Therefore, an article having good heat insulation performance can be obtained.

  Here, the heat insulating region is a region thermally insulated by a vacuum heat insulating material, for example, a region where heat is kept or cooled, a region surrounding a heat source or a cooling source, a region isolated from a heat source or a cooling source. It is. These areas may be spaces or objects.

  As articles, for example, electric devices such as refrigerators, freezers, heat insulators, and coolers, heat insulation containers, cold insulation containers, transport containers, containers, containers for storage containers, vehicles, aircraft, ships and other vehicles, houses, warehouses, etc. Examples include building materials such as buildings, wall materials, and flooring materials.

  Specific examples of the article with a vacuum heat insulating material of the present invention include a device having a heat source portion or a heat retaining portion in the main body or inside, and a device with a vacuum heat insulating material provided with a vacuum heat insulating material. Here, the “heat source section” refers to a portion that generates heat in the device main body or inside the device when the device itself is driven, and refers to, for example, a power source or a motor. The “insulated part” refers to a part that does not have a heat source part in the apparatus main body or inside, but the apparatus is heated by receiving heat from an external heat source.

  According to the present invention, the vacuum heat insulating material is the above-described vacuum heat insulating material, and can maintain heat insulating performance for a long time even at a high temperature. In the device having the heat retaining portion, the temperature of the heat retaining portion can be maintained by the vacuum heat insulating material. Thereby, it can be set as the apparatus which has the high energy saving characteristic which suppressed power consumption.

  About the vacuum heat insulating material in this invention, since it is the same as that of the content demonstrated by the term of the above-mentioned "B. Vacuum heat insulating material", description here is abbreviate | omitted.

  The device in the present invention has a main body or a heat source part or a heat-retained part inside the main body. Examples of the device in the present invention include, for example, natural refrigerant heat pump water heater (registered trademark “Ecocute”), refrigerator, vending machine, rice cooker, pot, microwave oven, commercial oven, IH cooking heater, electrical appliances such as OA equipment, Examples include automobiles. Especially in this invention, it is preferable that the said apparatus uses the vacuum heat insulating material in the above-mentioned this invention for a natural refrigerant | coolant heat pump water heater, a commercial oven, a microwave oven, and a motor vehicle.

  The said vacuum heat insulating material may be affixed directly on articles | goods, and may be arrange | positioned in the space provided between the members which comprise articles | goods. For example, as an aspect in which the vacuum heat insulating material is attached to a device, a vacuum heat insulating material may be directly attached to a heat source portion or a heat retaining portion of the device, and a vacuum is applied between the heat retaining portion and the heat source portion or an external heat source. You may install so that a heat insulating material may be inserted | pinched.

D. Next, a method for designing the outer packaging material for vacuum heat insulating material according to the present invention will be described. The method for designing an outer packaging material for a vacuum heat insulating material according to the first aspect of the present invention includes a thermally weldable film, a gas barrier film having a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material. The method of designing the outer packaging material for a vacuum heat insulating material having a temperature of 20 ° C. to 145 ° C. when the temperature of the atmosphere is 20 ° C. And after maintaining the temperature of the atmosphere at 145 ° C. for 1 hour, the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less. Thus, the layer structure of the outer packaging material for a vacuum heat insulating material is designed.

Moreover, the design method of the outer packaging material for vacuum heat insulating materials according to the second aspect of the present invention includes a heat-weldable film, a gas barrier having a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material. And a film having a water vapor permeability of 0.01 g / (m ² · day) in an atmosphere at a temperature of 40 ° C. and a humidity of 90% RH. ) An atmosphere having an oxygen permeability of 0.05 cc / (m ² · day · atm) or less and a temperature of 145 ° C. in an atmosphere having a temperature of 100 ° C. and a humidity of 0% RH. The layer structure of the outer packaging material for vacuum heat insulating material is designed so that the amount of deterioration of the water vapor permeability of the outer packaging material for vacuum heat insulating material after storage at 500 hours is 0.01 g / (m ² · day) or less It is characterized by The

  According to the present invention, the outer packaging material has the above-described rate of dimensional change, or the outer packaging material has the above-described water vapor permeability, oxygen permeability, and deterioration in water vapor permeability after high-temperature storage. By designing the layer structure of the outer packaging material, it is possible to design an outer packaging material capable of forming a vacuum heat insulating material that can maintain heat insulation performance for a long period of time even at high temperatures.

  In the method for designing an outer packaging material for a vacuum heat insulating material according to the present invention, as described in the above-mentioned section “A. Outer packaging material for a vacuum heat insulating material, (A-1) first aspect”, the dimensional change rate at a high temperature is high. Design the layer structure of the outer packaging material so as to be within a specific range, or as described in the section of “A. Outer packaging material for vacuum heat insulating material, (A-2) Second aspect” described above. By designing the layer structure of the outer packaging material so that the degree of deterioration of the water permeability, the oxygen permeability, and the water vapor permeability after high-temperature storage is within a specific range, the outer packaging material can be used for a long time even at high temperatures. A vacuum heat insulating material capable of maintaining the heat insulating performance can be formed. Since the method of designing such an outer packaging material is the same as that described in the section “A. Outer packaging material for vacuum heat insulating material” described above, description thereof is omitted here.

E. Next, the manufacturing method of the vacuum insulating material outer packaging material of the present invention will be described. The method for producing an outer packaging material for a vacuum heat insulating material according to the first aspect of the present invention includes a heat-weldable film, a gas barrier film having a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material. A method for producing an outer packaging material for a vacuum heat insulating material having a temperature of 20 ° C. to 145 ° C. when the temperature of the atmosphere is 20 ° C. And after maintaining the temperature of the atmosphere at 145 ° C. for 1 hour, the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less. Thus, it has a design process for designing the layer structure of the outer packaging material for a vacuum heat insulating material.

Moreover, the manufacturing method of the outer packaging material for vacuum heat insulating materials of the 2nd aspect of this invention is a gas barrier which has a gas barrier layer arrange | positioned at the at least one surface side of the film which can be heat-welded, and the said resin base material. And a film having a water vapor permeability of 0.01 g / (m ² · day) in an atmosphere at a temperature of 40 ° C. and a humidity of 90% RH. ) An atmosphere having an oxygen permeability of 0.05 cc / (m ² · day · atm) or less and a temperature of 145 ° C. in an atmosphere having a temperature of 100 ° C. and a humidity of 0% RH. The layer structure of the outer packaging material for vacuum heat insulating material is designed so that the amount of deterioration of the water vapor permeability of the outer packaging material for vacuum heat insulating material after storage at 500 hours is 0.01 g / (m ² · day) or less It has a design process that It is a sign.

  According to the present invention, by having the above design process, it is possible to manufacture an outer packaging material capable of forming a vacuum heat insulating material that can maintain a heat insulating performance for a long time even at a high temperature.

  The manufacturing method of the outer packaging material for a vacuum heat insulating material according to the present invention is a dimension at a high temperature as described in the above-mentioned section “A. Outer packaging material for a vacuum heat insulating material, (A-1) first aspect” in the design process. Design the layer structure of the outer packaging material so that the rate of change is within a specific range, or as described in the section “A. Outer packaging material for vacuum heat insulating material, (A-2) Second aspect” above. By designing the layer structure of the outer packaging material so that the water vapor transmission rate, the oxygen transmission rate, and the deterioration amount of the water vapor transmission rate after high-temperature storage are within a specific range, the outer packaging material is It is also possible to form a vacuum heat insulating material that can maintain heat insulating performance for a long time. Such a design process is the same as that described in the above-mentioned section “A. Outer packaging material for vacuum heat insulating material”, and thus description thereof is omitted here.

  In the present invention, as long as the outer packaging material designed in the design process can be obtained, each process other than the above-described design process is not particularly limited, and a general manufacturing method of the outer packaging material It can be the same as each step in. For example, a dry lamination process in which each layer formed in advance is bonded using an interlayer adhesive, and each material of a gas barrier film that has been melted by heat is extruded and bonded using a T-die, etc. A bonding step and the like in which a heat-weldable film is bonded through an interlayer adhesive can be exemplified.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described more specifically with reference to Examples, Comparative Examples and Reference Examples.

[Example 1]
(Preparation of interlayer adhesive)
Two-component curing by mixing a main component mainly composed of polyester, a curing agent containing an aliphatic polyisocyanate, and ethyl acetate so that the weight blending ratio is main agent: curing agent: ethyl acetate = 10: 1: 10. A mold interlayer adhesive was prepared.

(Preparation of outer packaging material for vacuum insulation)
An outer packaging material having a layer configuration of heat-weldable film / first gas barrier film (resin substrate / deposited film) / second gas barrier film (deposited film / resin substrate) / protective film was produced. In the above description of the layer configuration, “/” indicates a laminated interface.
As a first gas barrier film and a second gas barrier film, an aluminum film (Al film) having a thickness of 40 nm is deposited on one side as a gas barrier layer, and an overcoat layer (OC layer) is further provided on the Al film, and a PET film base having a thickness of 12 μm. Materials (company name: Toray Film Processing Co., Ltd., product name: VMPET1310) were used. Further, unstretched polypropylene having a thickness of 50 μm (company name: Toray Film Co., Ltd., product name: 3301) was used as a heat-weldable film. As a protective film, a stretched nylon film (company name: Dai Nippon Printing Co., Ltd.) having a thickness of 15 μm having a silicon oxide film (SiO ₂ film) deposited on one side as a gas barrier layer and further having an overcoat layer (OC layer) on the SiO ₂ film. Co., Ltd., product name: IB-ON-UB) was used. In each of the above layers, the interlayer adhesive prepared at the above-mentioned blending ratio was laminated on the surface side of the lower layer by a dry laminating method so that the application amount was 3.5 g / m ² .
The outer packaging material obtained in Example 1 is a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the PET film substrate, Al film, and OC layer stacking order), a second gas barrier film (heat-welded) Layers in the order of lamination of the OC layer, Al film, and PET film base material from the possible film side), and protective films (layer order of the OC layer, SiO ₂ film, and nylon film from the heat-weldable film side) It had a configuration (FIG. 3B).

(Preparation of vacuum insulation)
Two sheets of the obtained outer packaging material were stacked and heat sealed in the three directions of the rectangle to create a bag body opened in only one direction. 300 mm × 300 mm × 30 mm glass wool was used as the core material, and after drying, the core material was housed in the bag body and the bag body was evacuated. Then, the opening part of the said bag body was sealed by heat sealing, and the vacuum heat insulating material was obtained. The ultimate pressure was 0.05 Pa.

[Example 2]
As the first gas barrier film, an EVOH resin substrate (company name: Kuraray Co., Ltd., product name: VMXL) having a thickness of 12 μm in which an aluminum film (Al film) having a thickness of 40 nm as a gas barrier layer is deposited on one side is used. As a 2 gas barrier film, a PET film base having a thickness of 12 μm having a silicon oxide film (SiO ₂ film) having a thickness of 30 nm as a gas barrier layer deposited on one surface and further having an overcoat layer (OC layer) having a thickness of 200 nm on the SiO ₂ film. An outer packaging material and a vacuum heat insulating material were obtained in the same manner as in Example 1 except that the material (company name: Dai Nippon Printing Co., Ltd., product name: IB-PET) was used.
The outer packaging material obtained in Example 2 is a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the EVOH resin base material, an Al film stacking order), and a second gas barrier film (heat-weldable film) Layer structure (order of lamination of OC layer, SiO ₂ film, PET film substrate from the side) and protective film (order of lamination of OC layer, SiO ₂ film, nylon film from the heat-weldable film side) 3 (b)).

[Example 3]
Polybutylene terephthalate (company name: OG Film Co., Ltd.) having a thickness of 25 μm was used as a heat-weldable film, and instead of the protective film, the first gas barrier film (PET film substrate / Al film / OC in Example 1) was used. Layer) was used as the third gas barrier film, and the outer packaging material having a layer structure of heat-weldable film / first gas barrier film / second gas barrier film / third gas barrier film was used in the same manner as in Example 1. An outer packaging material and a vacuum heat insulating material were obtained.
The outer packaging material obtained in Example 3 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the PET film base material, an Al film, and an OC layer stacking order), a second gas barrier film (heat-welded) OC layer, Al film, PET film base material stacking order from the possible film side), and third gas barrier film (OC layer, Al film, PET film order from the heat-weldable film side) layer stacking order It had a configuration (FIG. 3 (e)).

[Example 4]
As the first and second gas barrier films, an aluminum film (Al film) having a thickness of 40 nm is deposited on one side as a gas barrier layer, and an overcoat layer (OC layer) is further laminated on the Al film. An outer packaging material and a vacuum heat insulating material were obtained in the same manner as in Example 1 except that a polyimide (PI) base material (company name: Ube Industries, Ltd., product name: Upilex S) was used.
The outer packaging material obtained in Example 4 is a heat-weldable film, a first gas barrier film (in the order of lamination of the PI base material, Al film, and OC layer from the heat-weldable film side), and a second gas barrier film (can be heat-welded) Layer structure in which the OC layer, Al film, and PI base material are laminated in order from the correct film side, and the protective film (the OC layer, SiO ₂ film, and nylon film from the heat-weldable film side in this order) (FIG. 3B).

[Example 5]
An outer packaging material and a vacuum heat insulating material were obtained in the same manner as in Example 1 except that a 25 μm thick polyphenyl sulfide (PPS) base material (company name: Toray Industries, Inc., product name: Torelina) was used as the protective film. It was.
The outer packaging material obtained in Example 5 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the PET film base material, an Al film, and an OC layer stacking order), a second gas barrier film (heat-welded) From the possible film side, it had an OC layer, an Al film, a stacking order of the PET film base material), and a layer configuration (FIG. 3B) which was a stacking order of the protective film.

[Example 6]
(Film formation of heat-weldable film)
A crystalline polyethylene terephthalate resin (company name: Toyobo Co., Ltd., product name: SI-173) was extruded by a T-die method to form a heat-weldable film (CPET30) having a thickness of 50 μm.

An outer packaging material and a vacuum heat insulating material were obtained in the same manner as in Example 1 except that CPET30 was used as a thermally weldable film instead of the thermally weldable film of Example 1.
The outer packaging material obtained in Example 6 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the PET film base material, an Al film, and an OC layer stacking order), a second gas barrier film (heat-welded) Layers in the order of lamination of the OC layer, Al film, and PET film base material from the possible film side), and protective films (layer order of the OC layer, SiO ₂ film, and nylon film from the heat-weldable film side) It had a configuration (FIG. 3B).

[Example 7]
The same as Example 2 except that a PET resin substrate (company name: Kuraray Co., Ltd., product name: Clarista CF12) having a phosphorus-containing Al ₂ O ₃ film as a gas barrier layer on one side was used as the second gas barrier film. Thus, an outer packaging material was obtained, and a vacuum heat insulating material was obtained in the same manner as in Example 1.
The outer packaging material obtained in Example 7 is a heat-weldable film, a first gas barrier film (from the heat-weldable film side in order of lamination of EVOH resin base material and Al film), and a second gas barrier film (heat-weldable film) Layer structure in the order of lamination of phosphorus-containing Al ₂ O ₃ film and PET resin base material from the side, and protective film (OC layer, SiO ₂ film and nylon film from the heat-weldable film side) (FIG. 3B).

[Example 8]
An outer packaging material and a vacuum heat insulating material were obtained in the same manner as in Example 1 except that the second gas barrier film in Example 1 was replaced with the second gas barrier film in Example 2.
The outer packaging material obtained in Example 8 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the PET film base material, an Al film, and an OC layer stacking order), and a second gas barrier film (heat-welded). Laminate order of overcoat layer, SiO ₂ film, PET film base material from possible film side), and protective film (lamination order of OC layer, SiO ₂ film, nylon film from heat weldable film side) It had a layer structure as shown in FIG.

[Example 9]
Using the heat-weldable film of Example 1, the first gas barrier film of Example 1, the second gas barrier film of Example 1, and the protective film of Example 1, a heat-weldable film, a first gas barrier film (heat OC layer, Al film, PET film substrate stacking order from the weldable film side), second gas barrier film (OC layer, Al film, PET film substrate stacking order from the heat weldable film side), and protection An outer packaging material having a layer structure (FIG. 3C) in which films were laminated in the order of heat-weldable film side (OC layer, SiO ₂ film, nylon film lamination order) was obtained. Moreover, using the obtained outer packaging material, a vacuum heat insulating material was obtained in the same manner as in Example 1.

[Comparative Example 1]
As a second gas barrier film, a PET film substrate having a thickness of 12 μm having a 200 nm-thick zinc acrylate overcoat layer (OC layer) as a gas barrier layer on one side (company name: Mitsui Chemicals Tosero Co., Ltd., product name: Max Barrier) ) Was used in the same manner as in Example 2 to obtain an outer packaging material, and in the same manner as in Example 1 to obtain a vacuum heat insulating material.
The outer packaging material obtained in Comparative Example 1 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side to the EVOH resin base material and the Al film stacking order), and a second gas barrier film (heat-weldable film). Layer configuration in the order of lamination of zinc acrylate-based overcoat layer, PET film base material from the side) and protective film (OC layer, SiO ₂ film, nylon film from the heat-weldable film side) (FIG. 3B).

[Comparative Example 2]
As a second gas barrier film, a PET film substrate (company name: 12 μm) having a silicon oxide film (SiO ₂ film) as a gas barrier layer on one side and further having an overcoat layer (OC layer) on the SiO ₂ film. An outer packaging material was obtained in the same manner as in Example 2 except that Mitsubishi Resin Co., Ltd., product name: Tech Barrier HX) was used, and a vacuum heat insulating material was obtained in the same manner as in Example 1.
The outer packaging material obtained in Comparative Example 2 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side in the order in which the EVOH resin base material and the Al film are laminated), and a second gas barrier film (heat-weldable film). Layer structure (order of lamination of OC layer, SiO ₂ film, PET film substrate from the side) and protective film (order of lamination of OC layer, SiO ₂ film, nylon film from the heat-weldable film side) 3 (b)).

[Comparative Example 3]
As the second gas barrier film, an aluminum oxide (Al ₂ O ₃ ) film having a thickness of 30 nm is deposited on one side as a gas barrier layer, and an overcoat layer (OC layer) having a thickness of 200 nm is further formed on the Al ₂ O ₃ film. A PET film substrate (company name: Dai Nippon Printing Co., Ltd., product name: IB-PET) was used except that a packaging material was obtained in the same manner as in Example 2, and vacuum was applied in the same manner as in Example 1. Insulation was obtained.
The outer packaging material obtained in Comparative Example 3 includes a heat-weldable film, a first gas barrier film (from the heat-weldable film side in the order of lamination of the EVOH resin base material and the Al film), and a second gas barrier film (heat-weldable film). Overcoat layer, Al ₂ O ₃ film, PET film base material stacking order from the side), and protective film (OC layer, SiO ₂ film, nylon film stacking order from the heat-weldable film side) It had a layer structure (FIG. 3B).

  The layer structures of the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3 are shown in Table 1 below. Table 2 below shows the company name and product name of each film used in each of the above Examples and Comparative Examples.

[Evaluation]
1. Dimensional change rate of outer packaging material for vacuum heat insulating material About the outer packaging material obtained in Examples 1 to 9 and Comparative Examples 1 to 3, the dimensional change rate of the outer packaging material before and after the high temperature holding, the temperature rising process, the constant temperature process, and The dimensional change rate of the outer packaging material in each process of the temperature lowering process was obtained. The measurement sample is the “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (1) Dimensional change rate of outer packaging material for vacuum heat insulating material”. According to the method described in the section, a test piece (N = 3) of a desired size is sampled from the outer packaging material, and for each test piece, the radial direction is 22.5 ° from the reference point in the plane as illustrated in FIG. A total of 48 points (16 points × 3 test pieces) were collected. After measuring the reference dimensions, each measurement sample was placed in a series of processes of temperature increase, constant temperature, and temperature decrease according to the method and conditions described in the above section, and the time-lapse dimensions in each process and the dimensions after the series of processes were measured. . Each dimension including the reference dimension is measured under the dimension measurement conditions described in the above section, and the dimensional change rate of the measurement sample before and after holding at high temperature is calculated from the formula (1) described in the above section, and the average value of the 48 points. Was defined as the dimensional change rate of the outer packaging material for vacuum heat insulating material before and after the high temperature holding. Moreover, the dimensional change rate of the measurement sample in each process was calculated | required from the formula (2) of the said term, respectively, and it was set as the dimensional change rate of the envelope material for vacuum heat insulating materials in each process from the 48-point average value. The results are shown in Table 3.

2. Water vapor permeability of outer packaging material for vacuum heat insulating material About the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3, the water vapor permeability in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH was measured. The water vapor permeability is the above-mentioned “A. Outer packaging material for vacuum heat insulating material, (A-1) first aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (2) Water vapor permeability of outer packaging material for vacuum heat insulating material” Measured by the method described in. The water vapor permeability corresponds to the water vapor permeability before high-temperature storage or before bending treatment. Table 3 shows the measurement results.

3. Oxygen permeability of outer packaging material for vacuum heat insulating material About the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3, oxygen permeability in an atmosphere of a temperature of 100 ° C. and a humidity of 0% RH was measured. The oxygen permeability is the above-mentioned “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (3) Oxygen permeability of outer packaging material for vacuum heat insulating material” Measured by the method described in. The oxygen permeability corresponds to the oxygen permeability before storage at high temperature or before bending. Table 3 shows the measurement results.

4). Degradation amount of water vapor permeability after high temperature storage of outer packaging material for vacuum heat insulating material About the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3, the deterioration amount of water vapor permeability after high temperature storage was measured. The deterioration amount of water vapor permeability after high-temperature storage is the above-mentioned “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (4) For vacuum heat insulating material. It was measured by the method described in “Deterioration amount of water vapor permeability of outer packaging material”. Table 3 shows the measurement results.

5. Deterioration amount of oxygen permeability after high temperature storage of outer packaging material for vacuum heat insulating material About the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3, the deterioration amount of oxygen permeability after high temperature storage was measured. The amount of oxygen permeability deterioration after high-temperature storage is the above-mentioned “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (5) For vacuum heat insulating material. It was measured by the method described in “Deterioration amount of oxygen permeability of outer packaging material”. Table 3 shows the measurement results.

Ratio of tensile storage modulus value at 100 ° C. to tensile storage modulus value at 6.0 ° C. For each outer packaging material obtained in Examples 1-9 and Comparative Examples 1-3, a dynamic viscoelasticity measuring device was used. Then, the storage elastic modulus values E ′ ₀ and E ′ ₁₀₀ at a temperature of 0 ° C. and 100 ° C. at a frequency of 10 Hz are measured by a tensile method, respectively, and 100 with respect to the tensile storage elastic modulus value (E ′ ₀ ) at 0 ° C. The ratio of the tensile storage modulus value (E ′ ₁₀₀ ) at ° C. was calculated. The method for collecting the measurement sample used for the measurement, the method for measuring the storage elastic modulus value at each temperature, and the conditions thereof are as described above in “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Vacuum heat insulating material”. It was performed based on the characteristics of the outer packaging material for materials, the sampling method of the measurement sample described in the section of (6) Storage modulus, and the measurement method and conditions of the storage modulus value. The total number of measurement samples was 48 (16 points × 3 test pieces per test piece). Table 3 shows the measurement results.

7). Water vapor permeability and oxygen permeability after bending treatment From each of the outer packaging materials obtained in Examples 1 to 9 and Comparative Examples 1 to 3, a rectangular test piece of 210 mm width × 297 mm length (A4 size) (number of test pieces N = 1) were collected respectively. In accordance with ASTM F392, each test piece was bent three times using a gelbo flex tester (manufactured by Tester Sangyo Co., Ltd., model name: BE1006). The water vapor permeability and oxygen permeability were measured for each test piece after the third bending treatment. The method for measuring the water vapor permeability and oxygen permeability after the bending treatment is as described in the section “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material”. It was measured by the methods described in the sections of “(2) Water vapor permeability of outer packaging material for vacuum heat insulating material” and “(3) Oxygen permeability of outer packaging material for vacuum heat insulating material”. Table 3 shows the measurement results.

8). Measurement of heat conductivity of heat of vacuum heat insulating material The time change of the heat conductivity of the vacuum heat insulating material obtained in Examples 1-2 and Comparative Examples 1-2 in a temperature-145 ° C., humidity-free atmosphere was measured. The thermal conductivity of each vacuum heat insulating material was measured by a heat flow meter method using a thermal conductivity measuring device according to JIS A1412-2: 1999. As the thermal conductivity measuring device, a thermal conductivity measuring device Auto Lambda HC-074 (manufactured by Eihiro Seiki) was used. About a measurement sample and measurement conditions, it is the same as that of the measurement sample and measurement conditions of the thermal conductivity demonstrated in the above-mentioned section of "B. Vacuum heat insulating material, 3. Vacuum heat insulating material", and the said heat conductivity is three-point average value. To do. The measurement results are shown in FIG.

9. Correlation between thermal conductivity over time and each parameter Thermal conductivity after storing each vacuum heat insulating material obtained in Examples 1 to 9 and Comparative Examples 1 to 500 at a temperature of 145 ° C. and a humidity-free atmosphere for 500 hours ( Hereinafter, “sometimes referred to as“ time-dependent thermal conductivity ”) was measured by the same method as above, and the correlation between each parameter measured by the above-described method and the time-dependent thermal conductivity was graphed. FIG. 5 shows the correlation between the dimensional change rate of the outer packaging material before and after holding at a high temperature and the temporal thermal conductivity of the vacuum heat insulating material. The deterioration of the water vapor permeability after the high temperature storage of the outer packaging material and the temporal heat of the vacuum heat insulating material. FIG. 6 shows the correlation with the conductivity, and FIG. 7 shows the correlation between the dimensional change rate of the outer packaging material during the constant temperature process and the temporal thermal conductivity of the vacuum heat insulating material. FIG. 8 shows the correlation between the oxygen permeability of the outer packaging material and the temporal thermal conductivity of the vacuum heat insulating material. FIG. 8 shows the deterioration amount of the oxygen permeability after high temperature storage of the outer packaging material and the temporal thermal conductivity of the vacuum thermal insulating material. FIG. 9 shows the correlation with In FIGS. 5 to 9, numerical values in ◯ and ◇ indicate the numbers of the examples and comparative examples.

[Discussion]
From Table 3, the wrapping materials of Examples 1 to 9 have a dimensional change rate of 1% or less before and after holding at high temperature, and the wrapping materials of Comparative Examples 1 to 3 have a dimensional change rate before and after holding at high temperature of greater than 1%. It was. Compared with the outer packaging material of Examples 1 to 9 and the outer packaging material of Comparative Examples 1 to 3, the outer packaging material of Examples 1 to 9 has a water vapor permeability deterioration amount and an oxygen permeability deterioration amount of Comparative Examples 1 to 1. It was shown to be smaller than 3 outer packaging materials. From this, it was suggested that the reduction in gas barrier performance due to the dimensional change due to heat can be suppressed by setting the dimensional change rate before and after the high temperature holding to a predetermined value or less.

  From Table 3, it was shown that the water vapor permeability of the outer packaging materials of Examples 1 to 9 did not change significantly before and after high-temperature storage from the amount of deterioration of the water vapor permeability. On the other hand, even with the outer packaging materials of Examples 1 to 9, it was shown that the water vapor permeability after the third bending treatment increased more than the water vapor permeability before the bending treatment. Specifically, when the water vapor permeability after high temperature storage calculated from the deterioration amount of the water vapor permeability was compared with the water vapor permeability after 3 bending processes, the values differed by one digit or more. Further, regarding the outer packaging materials of Examples 1 to 9, when the oxygen permeability after high temperature storage calculated from the deterioration amount of oxygen permeability and the oxygen permeability after three bending processes were compared, the same outer packaging material was obtained. However, a different trend was shown. From these results, no correlation was confirmed between the deterioration of the gas barrier performance caused by the external force load and the deterioration of the gas barrier performance caused by the heat. Specifically, when the deterioration of the gas barrier performance after the bending treatment of Example 1 and Comparative Example 1 was compared with the deterioration of the gas barrier performance caused by heat, it was confirmed that there was no correlation.

  When Examples 1, 3-6, and 8-9 in Table 3 were compared with Examples 2 and 7, the outer packaging materials of Examples 1, 3-6, and 8-9, in which the DMA value was 25% or more, The amount of deterioration in oxygen permeability was smaller than the outer packaging materials of Examples 2 and 7 having a DMA value of less than 25%. From this result, it was suggested that by setting the DMA value to a predetermined value or more, it is possible to suppress the deterioration of the gas barrier performance of the outer packaging material due to the temperature change, in particular, the deterioration of the oxygen barrier performance. Moreover, it was suggested that it is preferable that a resin base material does not contain EVOH resin also from a viewpoint which sets DMA value more than predetermined value, and the viewpoint which suppresses the fall of gas barrier performance (especially oxygen barrier performance).

  When Example 1-8 of Table 3 was compared with Example 9, the outer packaging material of Examples 1-8 is the film 1 which can be heat-welded, as shown in FIGS. 3B and 3E. The gas barrier film 2 (2a) arranged on the upper side has the resin base material 3 and the gas barrier layer 4 in this order from the thermally weldable film 1 side, and thus has the layer configuration shown in FIG. Compared with the outer packaging material of Example 9, the deterioration amount of water vapor permeability was smaller. From this result, it is considered that the deterioration of the gas barrier layer due to the dimensional change of the heat weldable film due to thermal stress is suppressed by the resin base material being interposed between the heat weldable film and the gas barrier layer.

  From the result of FIGS. 5-9, the vacuum heat insulating material using the outer packaging material of Examples 1-9 showed the low thermal conductivity compared with the vacuum heat insulating material of Comparative Examples 1-3. In addition, the thermal conductivity of the vacuum heat insulating material is the characteristics of the outer packaging material used in the vacuum heat insulating material (dimensional change rate after holding at high temperature, dimensional change rate during the constant temperature process, water vapor permeability deterioration amount, oxygen transmission rate) It was shown to be related to the degree of deterioration. From this, the outer packaging material of the present invention (for example, the outer packaging material having a dimensional change rate after holding at high temperature of 1% or less and a dimensional change rate in a constant temperature process of 0.5% or less) is accompanied by a temperature change. It was suggested that the deterioration of the gas barrier performance can be suppressed, and that the vacuum heat insulating material using the outer packaging material can maintain a low thermal conductivity regardless of the temperature change.

[Experimental example and comparative experimental example]
About the outer packaging material obtained in Examples 1-5 and Comparative Examples 1-3, the above-mentioned "A. Outer packaging material for vacuum heat insulating material, (A-1) 1st aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, The dimensional change rate at a high temperature was measured using the preliminary method described in the section “(1) Dimensional change rate of vacuum insulation outer packaging material”. The dimensional change rate is the above-mentioned “A. Outer packaging material for vacuum heat insulating material, (A-1) First aspect, 1. Characteristics of outer packaging material for vacuum heat insulating material, (1) Dimensional change rate of outer packaging material for vacuum heat insulating material” The dimensions of the outer packaging material at each temperature were measured according to the preliminary method and conditions described in, and the dimensional change rate was obtained (Experimental Examples 1-5 and Comparative Experimental Examples 1-3). Table 4 below shows the rate of dimensional change in each process of each outer packaging material.
In addition, with respect to the outer packaging materials obtained in Examples 1 and 2 and Comparative Examples 1 and 2, the rate of dimensional change in a series of temperature rising process, constant temperature process, and cooling process measured by the preliminary method (Experimental Example 1). FIG. 10 shows the measurement results of changes with time in ˜2 and Comparative Experimental Examples 1-2). In addition, the broken line in the upper part of FIG. 10 shows the temperature change (temperature profile) of the atmosphere, and each line in the center part of FIG. 10 indicates that the temperature of the atmosphere is 20 ° C. for each outer packaging material of each experimental example and comparative experimental example. If the outer packaging material is longer than the above standard, the dimension is the plus side (the upper side of the standard), and if shorter than the above standard, the minus side (the lower side of the standard) ).

  It should be noted that the water vapor permeability and its deterioration amount, and the oxygen permeability and its deterioration amount in Table 4 are the same as those in Table 3 because they do not depend on the dimension measurement method.

  From the results of the above experimental examples and comparative experimental examples, the outer packaging material having a small dimensional change rate before and after holding at high temperature measured using the preliminary method (the dimensional change rate before and after holding at high temperature is 1% or less) is a vacuum heat insulating material. It was found that the heat insulation performance was maintained for a long time even at a high temperature.

DESCRIPTION OF SYMBOLS 1 ... Heat-weldable film 2, 2a, 2b, 2c ... Gas barrier film 3 ... Resin base material 4 ... Gas barrier layer 5 ... Protective film 10 ... Outer packaging material for vacuum heat insulating materials 11 ... Core material 12 ... End part 20 ... Vacuum heat insulation Material

Claims (10)

A vacuum insulation outer packaging material having a heat-weldable film and a gas barrier film,
The gas barrier film has a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material,
Based on the dimensions of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C., the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is held at 145 ° C. for 1 hour. Then, the dimensional change rate of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less.   When the storage elastic modulus was measured at a frequency of 10 Hz by a tensile method using a dynamic viscoelasticity measuring device, the ratio of the storage elastic modulus value at 100 ° C. to the storage elastic modulus value at 0 ° C. was 25. The outer packaging material for a vacuum heat insulating material according to claim 1, wherein the outer packaging material is at least%.   The outer packaging material for a vacuum heat insulating material according to claim 1 or 2, wherein at least the resin base material does not contain an ethylene-vinyl alcohol copolymer resin.   Based on the dimensions of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C., the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is changed to 145 ° C. for 1 hour. The dimensional change rate of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C to 20 ° C after being held is 0.5% or less. The outer packaging material for a vacuum heat insulating material according to any one of claims 3 to 3.   The vacuum rate when the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 20 ° C. to 145 ° C. is 1% or less, and the temperature of the atmosphere is held at 145 ° C. for 1 hour. The dimensional change rate of the outer packaging material for a heat insulating material is 0.5% or less, and the outer packaging material for a vacuum heat insulating material according to any one of claims 1 to 4.   The at least one said gas barrier film has an overcoat layer in the surface side on the opposite side to the said resin base material of the said gas barrier layer, The claim in any one of Claim 1-5 characterized by the above-mentioned. The outer packaging material for vacuum insulation as described.   The outer packaging material for vacuum insulation according to any one of claims 1 to 6, wherein the gas barrier film has a protective film on a surface opposite to the thermally weldable film. .   The vacuum insulation outer packaging material according to any one of claims 1 to 7, comprising two or more gas barrier films. A vacuum heat insulating material having a core material and a vacuum heat insulating material encapsulating the core material,
The outer packaging material for vacuum heat insulating material has a heat-weldable film and a gas barrier film,
The gas barrier film has a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material,
Based on the dimensions of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C., the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is held at 145 ° C. for 1 hour. Then, the dimensional change rate of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less. An article with a vacuum insulation comprising an article having a thermal insulation region and a vacuum insulation,
The vacuum heat insulating material has a core material and an outer packaging material for a vacuum heat insulating material that encloses the core material,
The outer packaging material for vacuum heat insulating material has a heat-weldable film and a gas barrier film,
The gas barrier film has a resin base material and a gas barrier layer disposed on at least one surface side of the resin base material,
Based on the dimensions of the outer packaging material for vacuum heat insulating material when the temperature of the atmosphere is 20 ° C., the temperature of the atmosphere is changed from 20 ° C. to 145 ° C., and the temperature of the atmosphere is held at 145 ° C. for 1 hour. Then, the dimensional change rate of the outer packaging material for a vacuum heat insulating material when the temperature of the atmosphere is changed from 145 ° C. to 20 ° C. is 1% or less.