JP2017133694A - Outer packaging material for vacuum heat insulation material, vacuum heat insulation material and article with vacuum heat insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer packaging material for a vacuum heat insulation material that can form a vacuum heat insulation material capable of maintaining adiabaticity for a long period under a high temperature environment or at a room temperature.SOLUTION: Provided is an outer packaging material for a vacuum heat insulation material including a thermal welding layer, a barrier layer and a protection layer in this order, and the thermal welding layer is a polypropylene film mainly composed of homopolymer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outer packaging material for a vacuum heat insulating material capable of forming a vacuum heat insulating material capable of maintaining heat insulating performance for a long period of time in a high temperature environment or at normal temperature.

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

  In general, vacuum insulation is made by fusing the edges of two facing outer packaging materials with heat to form a bag, and a core material such as foamed resin or fiber material is placed inside it, and the interior is evacuated to a vacuum state. And the opening of the bag is sealed and sealed. Since the inside of the vacuum heat insulating material is in a high vacuum state, heat transfer due to air convection inside is blocked, so that high heat insulating performance can be exhibited.

  Patent Document 1 includes a gas barrier layer and a polypropylene film layer as a gas barrier composite film for an outer packaging material of a vacuum heat insulating material that can be used even in places exposed to high temperatures, and has a small amount of volatile gas. A gas barrier composite film is disclosed. Patent Document 1 discloses that the heat insulating performance is improved by controlling the amount of volatile gas (the amount of volatile components) contained in the vacuum heat insulating material to a low level.

Japanese Patent No. 5335149

  In order to maintain long-term heat insulation performance in a vacuum heat insulation material that exhibits high heat insulation performance by making the vacuum heat insulation inside a vacuum state and blocking gas convection, maintain a high degree of vacuum over a long period of time. Is required. Even if the inside of the vacuum heat insulating material is made a high vacuum at the time of production, when the volatile gas is contained in the member constituting the outer packaging material for the vacuum heat insulating material, the degree of vacuum inside the vacuum heat insulating material decreases with time. In particular, for the heat-welded layer placed inside the barrier layer, the gas volatilized from the heat-welded layer stays inside the vacuum heat insulating material, which affects the change over time in the vacuum degree of the vacuum heat insulating material. Will grow. Therefore, in order to obtain a vacuum heat insulating material that can maintain higher heat insulating performance under a high temperature environment and at a normal temperature for a long period of time, a layer disposed inside the outer layer of the vacuum heat insulating material, in particular, the barrier layer Further reduction of the amount of volatile gas from

  The present invention has been made in view of the above problems, and provides a vacuum insulation outer packaging material capable of forming a vacuum insulation capable of maintaining heat insulation performance for a long time in a high temperature environment or at ordinary temperature. The main purpose.

  As a result of repeated studies to solve the above problems, the inventor of the present invention, among polypropylene films, unstretched polypropylene containing a homopolymer (hereinafter sometimes referred to as “CPP”) is more than other polypropylenes. The inventors have found that the amount of volatile gas contained is small and have completed the present invention.

  In addition, the above features do not depend on whether or not the polypropylene film is stretched. That is, in the polypropylene film, if the main polypropylene polymer component (hereinafter sometimes referred to as a polymer component) is mainly composed of a homopolymer, a block copolymer, a random copolymer or the like can be used regardless of whether or not the film is stretched. It has been found that the amount of volatile gas contained is small compared to the case where the main component is a copolymer. The present invention is based on such knowledge. Hereinafter, polypropylene may be referred to as “PP”.

  That is, the present invention is a vacuum heat insulating material envelope having a heat welding layer, a barrier layer, and a protective layer in this order, wherein the heat welding layer is an unstretched polypropylene film containing a homopolymer. An outer packaging material for a vacuum heat insulating material is provided.

  According to the present invention, by using a CPP film containing a homopolymer as the heat-welded layer of the vacuum insulation material, the amount of volatile gas contained in the member constituting the vacuum insulation material is reduced. Therefore, it is possible to obtain a vacuum heat insulating material outer packaging material capable of forming a vacuum heat insulating material capable of maintaining heat insulating performance for a long period of time in a high temperature environment or at normal temperature.

In the said invention, it is preferable that the amount of volatile gas in 90 degreeC of the said unstretched polypropylene film is 15 mg / m < ² > or less. If the amount of volatile gas of the CPP film is within the above range, it can be used as a vacuum heat insulating material envelope capable of forming a vacuum heat insulating material capable of maintaining heat insulating performance for a long time in a high temperature environment or at normal temperature. Because.

  The present invention is an outer packaging material for a vacuum heat insulating material having a heat-welded layer, a barrier layer, and a protective layer in this order, wherein the heat-welded layer is a polypropylene film containing a homopolymer as a main component. An outer packaging material for a vacuum heat insulating material is provided.

  According to the present invention, since the polymer component of the PP film used as the heat welding layer is mainly composed of a homopolymer, the amount of volatile gas contained in the heat welding layer can be reduced, and the amount of volatile gas is small. It can be set as the outer packaging material for a vacuum heat insulating material. In addition, the outer packaging material for a vacuum heat insulating material of the present invention, when used in a vacuum heat insulating material, can suppress a decrease in internal vacuum due to gas volatilized from the heat-welded layer. A vacuum heat insulating material that can maintain heat insulating performance for a long period of time can be formed.

In the said invention, it is preferable that the amount of volatile gas in 90 degreeC of the said polypropylene film is 15 mg / m < ² > or less. If the amount of volatile gas of the PP film is within the above range, it can be used as an outer packaging material for a vacuum heat insulating material capable of forming a vacuum heat insulating material capable of maintaining a heat insulating performance for a long time in a high temperature environment or at a normal temperature. Because.

In the above invention, the heat welding layer is, wave number of the infrared absorption spectrum, with respect to the peak intensity of the absorption peak peak intensity is maximum in the wave number region of 1380 ± 10 cm ^-1, from 700 cm ^-1 to 790 cm ^-1 The ratio of the peak intensity of the absorption peak having the maximum peak intensity in the region is preferably 0.05 or less. Note that an absorption peak having a maximum peak intensity in a desired wave number region may be referred to as a maximum absorption peak (in a desired wave number region).
1380cm to the maximum absorption peak derived from the propylene unit appeared in the vicinity of ^-1, units other than propylene units that appear in the wave number region of from 700 cm ^-1 to 790 cm ^-1 (hereinafter, sometimes referred to as other units.) From A PP film having a peak intensity ratio of the maximum absorption peak of a predetermined value or less is estimated to have high homopolymer purity. This is because the outer packaging material for a vacuum heat insulating material according to the present invention can reduce the amount of volatile gas from the heat welding layer by using such a PP film as a heat welding layer.
The unit means a constituent unit (monomer unit) of various polymers.

In the aspect described above, the heat welding layer is, in the infrared absorption spectrum, the absorption peak peak intensity is maximum and first absorption peak at a wave number region of ^{720cm -1 ± 5cm -1, 730cm -1} ± 5cm ^The absorption peak having the maximum peak intensity in the wave number region of ⁻¹ is the second absorption peak, and the absorption peak having the maximum peak intensity in the wave number region of 1380 ± 10 cm ⁻¹ is the third absorption peak. The ratio of the peak intensity of at least one of the first absorption peak and the second absorption peak to the peak intensity of the three absorption peaks is preferably 0.05 or less.
In particular, the ratio of the peak intensity of the first absorption peak to the peak intensity of the third absorption peak and the ratio of the peak intensity of the second absorption peak to the peak intensity of the third absorption peak are each 0. .05 or less is preferable.

Random PP and block PP often contain mainly ethylene units as other units, and ethylene units tend to appear as high-intensity peaks in the vicinity of wave numbers of 720 cm ⁻¹ and 730 cm ⁻¹ , respectively. . The PP film in which the peak intensity ratio between the maximum absorption peak derived from the ethylene unit and the maximum absorption peak derived from the propylene unit appearing in the vicinity of the two wave numbers is less than a predetermined value shall contain almost no random copolymer or block copolymer. It is assumed that the purity of the homopolymer is high. This is because the outer packaging material for a vacuum heat insulating material according to the present invention can reduce the amount of volatile gas from the heat welding layer by using such a PP film as a heat welding layer.

  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 welding layer, a barrier layer, and a protective layer, In this order, the heat welding layer is an unstretched polypropylene film containing a homopolymer, and provides a vacuum heat insulating material.

  The present invention also provides 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 welding layer, a barrier layer, and a protective layer. Are provided in this order, and the thermal welding layer is a polypropylene film having a homopolymer as a main component.

  According to the present invention, the outer packaging material for a vacuum heat insulating material is the above-described outer packaging material for a vacuum heat insulating material of the present invention, so that the heat insulating performance can be maintained for a long time in a high temperature environment or at a normal temperature. It can be a 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-welded layer, a barrier layer, and a protective layer in this order, and the heat-welded layer is an unstretched polypropylene film containing a homopolymer. Articles with vacuum insulation are provided.

  Further, the present invention is an article with a vacuum heat insulating material comprising an article having a heat insulating region and a vacuum heat insulating material, wherein the vacuum heat insulating material includes 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 welding layer, a barrier layer, and a protective layer in this order, and the heat welding layer is a polypropylene film containing a homopolymer as a main component. An article with a vacuum heat insulating material is provided.

According to the present invention, the vacuum heat insulating material is the above-described vacuum heat insulating material of the present invention, and can maintain the heat insulating performance for a long period of time in a high temperature environment or at room temperature. Heat from the heat source part is insulated by the vacuum heat insulating material, and the temperature of the entire device is prevented from becoming high. On the other hand, in a device having a heat retaining part, the temperature state of the heat retaining part by the vacuum heat insulating material. Can keep. Thereby, it can be set as the apparatus which has the high energy saving characteristic which suppressed power consumption.
Thus, 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 maintains the heat insulating performance for a long time in a high temperature environment or at normal temperature. Therefore, an article having good heat insulation performance can be obtained.

  In this invention, there exists an effect that the outer packaging material for vacuum heat insulating materials which can form the vacuum heat insulating material which can maintain heat insulation performance for a long time in high temperature environment or normal 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 the schematic perspective view and schematic sectional drawing which show an example of the vacuum heat insulating material of this invention. It is a graph which shows the result of having measured the quantity of the organic component among the volatile gas contained in various CPP films. It is a graph which shows the result of having measured the quantity of the inorganic component among the volatile gas contained in various CPP films. It is an infrared absorption spectrum of a polypropylene homopolymer film and a polyethylene film. It is a graph which shows the time-dependent change of the heat conductivity of the vacuum heat insulating material measured by the Example and the comparative example. It is a graph showing the peak intensity in the infrared absorption spectrum ratio _I B / _{I A} and _I C / _{I A} of the PP film of Reference Example.

  Hereinafter, the outer packaging material for a vacuum heat insulating material, the vacuum heat insulating material, and the device with the vacuum heat insulating material of the present invention will be described. In the following description, “external packaging material for vacuum heat insulating material” may be referred to as “external packaging material”.

A. The outer packaging material for a vacuum heat insulating material The outer packaging material for a vacuum heat insulating material of the present invention can be divided into two modes according to the specifications of the heat-welded layer. Hereinafter, it demonstrates for every aspect.

I. 1st aspect The outer packaging material for vacuum heat insulating materials of this invention is an outer packaging material for vacuum heat insulating materials which has a heat welding layer, a barrier layer, and a protective layer in this order, Comprising: The said heat welding layer contains a homopolymer. It is an unstretched polypropylene film.

  The outer packaging material of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the outer packaging material of the present invention. The outer packaging material 10 of the present invention has the heat welding layer 1, the barrier layer 2, and the protective layer 3 in this order. For the heat welding layer 1, an unstretched polypropylene film containing a homopolymer is used.

  Moreover, Fig.2 (a) is a schematic perspective view which shows an example of the vacuum heat insulating material using the outer packaging material of this invention, FIG.2 (b) is XX sectional drawing of Fig.2 (a). . As illustrated in FIGS. 2A and 2B, the vacuum heat insulating material 20 is sealed by heat-sealing the peripheral edges of two opposing outer packaging materials 10A and 10B, and the outer packaging materials 10A and 10B. The core material 11 is housed inside the space sealed by the pressure, and the inside is decompressed to be in a vacuum state. The sealing portions at the periphery of the outer packaging materials 10 </ b> A and 10 </ b> B become the end portions 12 of the vacuum heat insulating material 20. Note that the reference numerals in FIG. 2 indicate the same members as those in FIG.

  As described above, the vacuum heat insulating material is decompressed at the time of manufacture to be in a vacuum state, and convection of the internal gas is blocked, so that high heat insulating performance can be exhibited. However, when the member located inside the barrier layer contains volatile gas, the volatile gas stays inside the vacuum heat insulating material and is diffused, so the degree of vacuum inside the vacuum heat insulating material is lowered and high heat insulating performance is maintained. You may not be able to. In the present invention, the use of a CPP film containing a homopolymer as the heat-welding layer of the outer packaging material can reduce the amount of volatile gas contained in the member located on the inner side of the barrier layer. It can be set as the outer packaging material which can form the vacuum heat insulating material which can maintain heat insulation performance for a long time in an environment or normal temperature.

  The outer packaging material of the present invention has a heat welding layer, a barrier layer, and a protective layer in this order. Hereinafter, each structure of the outer packaging material of this invention is demonstrated.

1. Heat-welding layer The heat-welding layer in the present invention is a part that comes into contact with the core material when forming the vacuum heat insulating material using the outer packaging material, and has a heat-welding surface that thermally welds the ends of the facing outer packaging materials. It is a site to be formed. In the present invention, an unstretched polypropylene film containing a homopolymer is used as such a heat welding layer.

  Polypropylene has higher heat resistance than polyethylene that has been used as a heat-welded layer in conventional envelopes for vacuum heat insulating materials, and can therefore be used in vacuum heat insulating materials used in places exposed to high temperatures. Such polypropylene includes non-stretched polypropylene (CPP) that has not been stretched in the manufacturing process and stretched polypropylene (OPP) in which oriented crystallinity is enhanced by stretching in the manufacturing process. Especially, since CPP is excellent in heat-sealing property, it can be used suitably as a heat welding layer of an outer packaging material.

  However, some polypropylenes contain a large amount of volatile gases. When such a polypropylene film is used as a heat-welded layer, the gas volatilized from the heat-welded layer is diffused into the vacuum heat insulating material, so that the degree of vacuum inside the vacuum heat insulating material decreases with time, and the vacuum heat insulating material Insulation performance may not be maintained for a long time. As a result of repeated studies by the present inventors to solve such problems, unstretched polypropylene (CPP) containing a homopolymer among polypropylenes has a smaller amount of volatile gases than other polypropylenes. And the present invention has been completed.

  The polypropylene used as a raw material for the polypropylene film includes a homopolymer produced using a single monomer and a copolymer produced using two or more monomers. The above-mentioned copolymers can be further classified according to the sequence of the monomers, and include random copolymers having no order in the sequence of monomers and block copolymers having a sequence in which the same type of monomers are continuously long. As a result of repeated studies on the amount of volatile gas contained in these various polymers, the present inventors have found that homopolymers contain less volatile gas than copolymers such as random copolymers and block copolymers. It was.

  FIG. 3 is a graph showing the results of measuring the amount of organic components in the volatile gases contained in each CPP film containing a block copolymer, a random copolymer, and a homopolymer. The amount of the organic component is a total of hydrocarbons such as 2-methyl-1-pentene and methylcyclopentane, and an antioxidant (τ-butylphenol). The amount of the organic component of each film is measured as follows. Quantified by the method and analysis conditions. Measurements and analysis were performed on three samples for each CPP film. For each CPP film, the three bands on the left side of the graph indicate the quantitative results of each sample, and the rightmost band and the numerical values indicate the average for the three samples.

  The CPP film containing the block copolymer, the random copolymer, and the homopolymer used for the measurement of the amount of the organic component shown in FIG. 3 is a film composed of each polymer, that is, an unstretched polypropylene block copolymer. CPP films of film, unstretched polypropylene random copolymer film, and unstretched polypropylene homopolymer film.

<Measurement method>
For each CPP film, two test pieces cut into a size of 1 cm × 5 cm were put in a sample tube, and the sample tube was analyzed by a purge & trap GC / MS method under the following conditions. For the quantification, a calibration curve prepared according to the C16 standard was used, and the total amount of organic gas volatilized from the film was calculated as a C16 equivalent value (mg / 10 cm ² ).

<Purge and trap conditions>
-Device name: JTD505 manufactured by Nippon Analysis Industry
・ Heating temperature: 90 ℃
Cooling temperature: -60 ° C
・ Adsorbent: Glass wool ・ Purge time: 60 min
-Total split ratio (introduction amount: displacement) = 1:10
・ Column flow rate: 1 ml / min

<GC / MS conditions>
・ Device name: Agilent 6890/5973 manufactured by Agilent
-Capillary column-Name: DB-5MS equivalent-Stationary phase: 5% diphenyl dimethylsiloxane (micropolar)
-Length x film thickness x inner diameter: 30m x 0.25µm x 0.25mm
・ Column flow rate: 1 ml / min
・ Oven conditions: 50 ° C. (5 min) → (10 ° C./min)→320° C. (3 min)

  FIG. 4 is a graph showing the results of quantifying the amount of inorganic components in the volatile gas contained in each CPP film containing the same block copolymer, random copolymer and homopolymer as in FIG. The amount of the inorganic component is the sum of the amounts of hydrogen, water, nitrogen, carbon monoxide, oxygen, and carbon dioxide. The inorganic component of each CPP film is quantified by the following measurement method and analysis conditions. It has been done.

About each CPP film, the test piece cut out to the size of 4 mm x 4 mm was analyzed by heating on the following conditions by TDS (temperature-programmed desorption gas analysis) measurement.
<Heating conditions>
-Device name: EMD-WA1000S manufactured by Electronic Science
-Heating conditions: 30 ° C to 90 ° C
・ Raising rate: 10 ° C / min
-Holding temperature: 90 ° C
-Heat the sample on the SiC stage

<Measurement method>
・ MID method (quantitative)
Measurement mass number (M / Z): 2 (H ₂ ), 18 (H ₂ O), 28 (N ₂ · CO), 32 (O ₂ ), 44 (CO ₂ )

  From FIG. 3 described above, it can be seen that the amount of the organic component of the homopolymer is significantly less than that of the block copolymer. On the other hand, FIG. 4 shows that the amount of the inorganic component of the homopolymer is significantly less than that of the random copolymer. Thus, it can be seen that homopolymers are significantly less than copolymers such as block copolymers and random polymers with respect to the amount of volatile gas, which is the sum of the amount of organic and inorganic components.

  In general, copolymers are polymerized with components other than polypropylene, such as rubber components, depending on the desired properties, whereas homopolymers are those that contain very few components other than propylene. Compared to copolymers, the amount of volatile gas in homopolymers is small. Of the volatile gases contained in polypropylene, very few are derived from the propylene component, and most of the volatile gases are derived from components other than polypropylene. It is speculated that there is.

In the present invention, the amount of volatile gas at 90 ° C. of the CPP film used for the heat welding layer is preferably 15 mg / m ² or less, more preferably 10 mg / m ² or less, and particularly preferably 5 mg / m ² or less. When the amount of volatile gas of the CPP film is within the above range, the outer packaging material of the present invention can form a vacuum heat insulating material capable of maintaining heat insulating performance for a long time in a high temperature environment or at a normal temperature. Because you can.
The amount of volatile gas at 90 ° C. of the CPP film can be the amount of at least the organic component quantified by the method described above, and the total amount of the organic component and the inorganic component is preferably within the above range. .

  In the present invention, the “unstretched polypropylene film containing a homopolymer” is formed by molding a CPP containing a homopolymer into a sheet shape. In the present invention, “CPP containing a homopolymer” is a CPP having a homopolymer as a main component, and “having a homopolymer as a main component” means that the content of components other than propylene contained is 10 It means that it is in the range of not more than wt%, particularly not more than 5 wt%, particularly not more than 1 wt%. Examples of the “component other than propylene” include an anti-blocking agent, a lubricant, a flame retardant, an organic filler, and the like. Further, the “component other than propylene” referred to here includes, in addition to the above-mentioned additives, a polymer other than a PP homopolymer such as a copolymer of PP, other monomers, and the like.

In the present invention, the polymer component that is the main component of the CPP film is preferably composed mainly of a PP homopolymer. When the polymer component is based on a homopolymer of PP, it means that the content of units other than the propylene unit contained in the polymer component is small, and preferably the polymer component does not contain units other than the propylene unit. . Specifically, the content of units other than the propylene unit when the total polymer component of the PP film is 100% by mass is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. In particular, it is preferably 0.3% by mass or less.
A unit other than a propylene unit (that is, another unit) is, for example, a unit other than a propylene unit among units constituting a random copolymer of PP, or a unit constituting a copolymer coexisting with a homopolymer in a block copolymer of PP. Among these, units other than the propylene unit are exemplified. The other unit has a monomer skeleton that polymerizes with a propylene monomer in a random copolymer of PP, and a monomer skeleton that constitutes a copolymer that coexists with a homopolymer in a block copolymer of PP. Specific examples include olefin units such as ethylene units and butene units in random copolymers and block copolymers. In addition, when an unreacted monomer is contained alone in the polymer component, the unit other than the propylene unit includes the monomer other than the propylene monomer.

  A PP homopolymer (hereinafter sometimes referred to as homo-PP) is usually a homopolymer of a propylene monomer, whereas a PP random copolymer (hereinafter sometimes referred to as random PP) is It is a copolymer of propylene and a copolymerizable monomer other than propylene such as ethylene, and has a configuration in which propylene units and units other than the propylene units are randomly distributed in the polymer chain. Specifically, the ethylene propylene copolymer (EPM) in which the copolymerization monomer other than propylene is ethylene has a configuration in which propylene units and ethylene units are randomly distributed in the polymer chain. The block copolymer of PP (hereinafter sometimes referred to as block PP) is, for example, a mixture in which a polyethylene component and an ethylene propylene rubber (EPR) component are dispersed in homo PP, and a matrix portion including propylene units; A matrix-domain structure consisting of a domain part containing an ethylene unit.

  That is, when the PP film contains a homopolymer and a copolymer as a polymer component, the polymer component contains propylene units and other units. At this time, as the proportion of the copolymer in the polymer component is higher, the content of the other unit is increased, so that the content of the propylene unit is relatively decreased. On the other hand, the higher the proportion of the homopolymer in the polymer component, the lower the content of the other unit. Therefore, if the content of the other unit in the polymer component is equal to or less than a predetermined value, the polymer component of the PP film can contain a homopolymer as a main component. These features do not depend on whether or not the PP film is stretched.

The content of other units in the polymer component is determined by, for example, measuring the infrared absorption spectrum of the PP film by the method described later, and the peak intensity of the absorption peak derived from the propylene unit and the absorption peak derived from the other unit. It can be calculated by subtracting a calibration curve from the ratio. As another calculation method, the PP film can be dissolved in a suitable deuterated solvent, ¹ H-NMR can be measured, and the integrated value can be calculated.

  In the PP film, the mixing ratio of the homopolymer and the copolymer in the polymer component is at least one of an absorption peak derived from a propylene unit in an infrared absorption spectrum and one or more absorption peaks derived from other units included in the copolymer. It can be confirmed from the peak intensity ratio of two absorption peaks. As explained above, the copolymer contains other units such as ethylene units in addition to propylene units. For this reason, when the PP film contains a homopolymer and a copolymer, in the infrared absorption spectrum of the PP film, in addition to the absorption peak derived from the propylene unit, an absorption peak derived from another unit of the copolymer appears, and is derived from the other unit. It is suggested that the higher the peak intensity of the absorption peak, the higher the proportion of the copolymer in the polymer component.

Here, the absorption peak derived from the propylene unit can be the maximum absorption peak A appearing in the vicinity of 1380 cm ^{−1 as} shown in FIG. The absorption peak A that appears in the vicinity of the wave number is presumed to be a peak derived from C—H symmetrical bending vibration, and indicates the presence of a chain-measured methyl (—CH ₃ ) group contained in the propylene unit.
Further, the peak derived from the other units included in the copolymer may be at least one or more absorption peaks appearing in the frequency domain from 700 cm ^-1 to 790 cm ^-1. For example, when the polymer includes an ethylene unit, as shown in FIG. 5, absorption peaks B and C with high intensity appear near the wave numbers of 720 cm ⁻¹ and 730 cm ⁻¹ , respectively. The absorption peak B and absorption peak C appearing in the vicinity of the wave number are presumed to be peaks derived from the ethylene unit due to the CC skeleton vibration of the ethylene unit. When the above peak appears in the PP film, the existence of ethylene units in the random PP or block PP is suggested. Like the ethylene unit, a plurality of peaks may appear in the wave number region depending on the type of other units.

  FIG. 5 shows infrared absorption spectra of a polypropylene homopolymer film (hereinafter referred to as a homo PP film) and a polyethylene (hereinafter referred to as PE) film. The homo PP film is the same as the CPP film used in Example 1 described later. The PE film is the same as the PE film used in the reference evaluation described later. The infrared absorption spectrum of each film was measured by the same method as the method for measuring the infrared absorption spectrum of the heat-welded layer described later.

Therefore, the smaller the peak intensity ratio of the absorption peak derived from the other unit contained in the copolymer that appears in the predetermined wave number region with respect to the peak intensity of the maximum absorption peak that appears in the vicinity of 1380 cm ⁻¹ derived from the propylene unit, Since the proportion of the other units in the polymer component is reduced, a PP film having a low copolymer content and a high homopolymer purity can be obtained. The above features do not depend on whether or not the PP film is stretched.
The peak intensity can be the height of the absorption peak, and the peak intensity ratio can be the peak height ratio. Further, the vicinity of 1380 cm ^-1, means a tolerance relative to the 1380 cm ^-1, can be a wave number region of 1380cm ^-1 ± 10cm ^-1. Among these, a wave number region of 1380 cm ⁻¹ ± 5 cm ⁻¹ is preferable.

In the present invention, with respect to the peak intensity of the absorption peak peak intensity is maximum around 1380 cm ^-1, the ratio of the peak intensity of the absorption peak peak intensity is maximum in the wave number region of from 700 cm ^-1 to 790 cm ^-1 0.05 or less, preferably 0.04 or less, and particularly preferably 0.03 or less. A PP film in which the peak intensity ratio of the maximum absorption peak derived from another unit to the maximum absorption peak derived from the propylene unit is not more than a predetermined value can be substantially free of random copolymer and block copolymer. It is assumed that the purity is high. This is because by using such a PP film as a heat-welded layer, the amount of volatile gas from the heat-welded layer can be reduced.

In particular, the ratio of the peak intensity of the absorption peak having the maximum peak intensity near 725 cm ⁻¹ to the peak intensity of the absorption peak having the maximum peak intensity near 1380 cm ⁻¹ is preferably 0.05 or less. Of these, 0.04 or less, particularly 0.03 or less is preferable.
Here, the vicinity of 725 cm ^-1, means a tolerance relative to the 725 cm ^-1, can be a wave number region of 725cm ^-1 ± 25cm ^-1. The allowable range may be ± 20 cm ⁻¹ , ± 15 cm ⁻¹ , or ± 10 cm ⁻¹ .

When random PP and block PP mainly contain ethylene units as other units, a strong absorption peak derived from ethylene units tends to appear in the vicinity of 725 cm ⁻¹ . Therefore, by defining the peak intensity ratio of the maximum absorption peak in the vicinity of the maximum absorption peak and 1380 cm ^-1 in the vicinity of 725 cm ^-1, it can be pure homopolymer with high PP film.

In the above-wave band region, when two or more absorption peak appears, in the infrared absorption spectrum, the absorption peak and the peak intensity peak intensity is maximum in the wave number region of from 700 cm ^-1 to 790 cm ^-1 The second largest absorption peak (sometimes referred to as the second maximum absorption peak) is defined as the first absorption peak and the second absorption peak from the low wavenumber side, and the absorption peak having the maximum peak intensity around 1380 cm ⁻¹ When the third absorption peak is set, the ratio of the peak intensity of at least one of the first absorption peak and the second absorption peak to the peak intensity of the third absorption peak is 0.05 or less. Among these, 0.04 or less, particularly 0.03 or less is preferable.

Among them, the absorption peak having the maximum peak intensity near 725 cm ⁻¹ and the absorption peak having the second highest peak intensity are defined as the first absorption peak and the second absorption peak from the low wavenumber side, and the peak intensity is near 1380 cm ^−1. When the maximum absorption peak is defined as the third absorption peak, the ratio of the peak intensity of at least one of the first absorption peak and the second absorption peak to the peak intensity of the third absorption peak is 0. It is preferably 05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less.

  The ratio of the peak intensity of the first absorption peak to the peak intensity of the third absorption peak is defined as a first peak intensity ratio. The ratio of the peak intensity of the second absorption peak to the peak intensity of the third absorption peak is defined as a second peak intensity ratio.

In the wave number region of from the 700 cm ^-1 to 790 cm ^-1, if a large peak intensity derived from the other units contained in the copolymer appears more, the maximum absorption peak and a second largest absorption peak at the wave number region This is because at least one of them exhibits a predetermined peak intensity ratio with respect to the maximum absorption peak derived from the propylene unit, thereby increasing the purity of the homopolymer of the PP film.

  In the wavenumber region, it is sufficient that at least one of the first peak intensity ratio and the second peak intensity ratio is within the above-described peak intensity ratio, and among them, the first peak intensity ratio and the second peak intensity ratio are respectively It is preferable to be within the range of the peak intensity ratio described above.

Furthermore, the heat welding layer is, in the infrared absorption spectrum, 720 cm absorption peaks peak intensity is maximum around ^-1 to the first absorption peak, 730 cm ^-1 The absorption peak peak intensity is maximum in the vicinity of the second When the absorption peak having the maximum peak intensity in the vicinity of 1380 cm ^{−1 is} defined as the third absorption peak, the first absorption peak and the second absorption peak with respect to the peak intensity of the third absorption peak. The ratio of at least one of the peak intensities is preferably 0.05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less.
It is sufficient that at least one of the first peak intensity ratio and the second peak intensity ratio is within the range of the above-described peak intensity ratio, and among them, each of the first peak intensity ratio and the second peak intensity ratio is The peak intensity ratio is preferably within the range described above.

Here, the vicinity of 720 cm ^-1, can be a wave number region of 720 cm ^-1 ± ^{5 cm -1,} it is preferably a wave number region of inter alia 720cm ^-1 ± ^{2cm -1.} Further, the vicinity of 730 cm ^-1, can be a wave number region of 730 cm ^-1 ± ^{5 cm -1,} it is preferably a wave number region of inter alia 730cm ^-1 ± ^{2cm -1.}

Random PP and block PP often contain ethylene units as other units in many cases, and the ethylene units often have high intensity peaks mainly near 720 cm ⁻¹ and 730 cm ⁻¹ . The PP film in which at least one of the first absorption peak and the second absorption peak derived from the ethylene unit of the copolymer is not more than a predetermined value relative to the peak intensity of the third absorption peak derived from the propylene unit is a random copolymer and a block It can be assumed that it contains very little copolymer and the homopolymer is highly pure. That is, since such a PP film can contain homo PP as a main component among polymer components, the amount of volatile gas generated can be reduced by using the PP film as the heat-welded layer.

The infrared absorption spectrum in the present invention can be measured by a single reflection ATR measurement method using a Fourier transform infrared spectrophotometer (FT-IR), where the horizontal axis is wave number and the vertical axis is absorbance. Specifically, the attachment method is installed in the spectroscope, and the outer packaging material cut out to a desired size (several cm square) is set so that the surface of the heat-welded layer faces the attachment device, The infrared absorption spectrum of the heat-welded layer can be obtained by measuring the spectrum of a single reflection when the surface of the heat-welded layer is irradiated with infrared rays. In the measurement, the infrared absorption spectrum of the heat-welded layer can be measured in the state of the outer packaging material by adjusting the light penetration depth according to the thickness of the heat-welded layer.
(Measurement condition)
Spectrometer: Fourier transform infrared spectrophotometer FTS-7000 (manufactured by Digilab)
・ Attachment equipment: Attachment for one reflection ATR: Silver Gate Evolution (manufactured by SPECAC)
-Prism: Ge crystal-Incident angle: 45 ° incidence-Measurement wavenumber region: 700 cm ^{-1 to} 4000 cm ^-1
・ Resolution: 4cm ^-1
・ Scanning speed: 20kHz
・ Total number of times: 64

  In the present invention, the thickness of the CPP film used as the heat welding layer is preferably within a range of 20 μm to 100 μm, for example, preferably within a range of 25 μm to 90 μm, and particularly preferably within a range of 30 μm to 80 μm. If the thickness of the heat-welded layer is larger than the above range, the probability of outside air entering from the heat-welded portion is increased, and if the thickness is smaller than the above range, a desired adhesive force may not be obtained.

  As the CPP film as described above, a commercially available product may be used, or a CPP obtained by polymerizing propylene by a known method may be used.

2. Barrier layer The barrier layer in this invention is a site | part normally formed between a heat welding layer and a protective layer. Such a barrier layer is generally used as a barrier layer, such as a laminate having a metal foil, a resin base material, and a barrier film containing an inorganic substance disposed on at least one surface side of the resin base material. Can also be used. This is because by using such a barrier layer, an outer packaging material capable of forming a vacuum heat insulating material capable of maintaining a heat insulating performance for a long time in a high temperature environment or at a normal temperature can be obtained.

  As metal foil, metal foil, such as aluminum, nickel, stainless steel, iron, copper, titanium, is mentioned, for example.

As said laminated body, a well-known barrier film etc. are mentioned, for example. As an inorganic substance which comprises the barrier film of the said laminated body, inorganic compounds, such as inorganic oxides, such as a metal, a metal oxide, and a silicon oxide, are mentioned, for example. The barrier film may be a coating (coating) film or a vapor deposition film, but is preferably a vapor deposition film. This is because the adhesiveness with the resin substrate is high and high gas barrier performance can be exhibited.
Moreover, the resin base material of the said laminated body is not specifically limited, For example, the resin base material in well-known barrier films, such as PET film, can be used.

  The barrier layer may be one in which a barrier composition film further including a barrier composition is disposed on the barrier film of the laminate. Examples of the barrier composition include a barrier composition containing at least one of a polyvinyl alcohol resin and an ethylene vinyl alcohol copolymer.

  The barrier layer may be a single layer or a multilayer body in which layers made of the same material or layers made of different materials are laminated. When the barrier layer is a laminate having the above-described resin base material and barrier film, the barrier film may be a single layer, or two or more barrier films having the same composition or barrier films having different compositions are laminated. It may be. In addition, the barrier layer may be subjected to a surface treatment such as a corona discharge treatment from the viewpoint that the barrier performance and the adhesion with other layers can be improved.

  The thickness of the barrier layer is, for example, preferably in the range of 2 μm to 50 μm, and more preferably in the range of 5 μm to 25 μm. If the thickness of the barrier layer is smaller than the above range, pinholes and the like are likely to occur in the barrier layer, and if the thickness of the barrier layer is larger than the above range, cracks and the like are likely to be generated at the bent portion, so May decrease. In addition, when a barrier layer of a metal foil such as an aluminum foil is applied, heat bridge is likely to occur, and the heat insulation performance may be lowered.

The barrier performance of the barrier layer, the oxygen permeability is preferably ^{0.5cc / (m 2 · day ·} atm) or less, it is inter alia ^{0.1cc / (m 2 · day ·} atm) or less preferable. Further, the water vapor permeability is preferably 0.5 g / (m ² · day) or less, more preferably 0.1 g / (m ² · day) or less. When the oxygen and water vapor permeability of the barrier layer is within the above-described range, it is possible to make it difficult for water, gas, or the like that has permeated from the outside to penetrate into the inner core material. The oxygen permeability and water vapor permeability of the entire outer packaging material of the present invention are preferably within the above ranges.

Measurement of oxygen permeability is in accordance with JIS K7126-2A: 2006 (Plastics-Film and Sheet-Gas permeability test method-Part 2: Isobaric method, Appendix A: Test method of oxygen gas permeability by electrolytic sensor method) It can be measured using an oxygen gas permeability measuring device under conditions of a temperature of 23 ° C. and a humidity of 60% RH. As an oxygen gas permeability measuring device, for example, OXTRAN manufactured by MOCON, USA can be used. The measurement is carried out by mounting the surface of the outer packaging material in the apparatus so that the surface located on the barrier layer side is in contact with the oxygen gas with respect to the heat-weldable film in the thickness direction 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 12 hours have been secured as the time from the start of flowing until the equilibrium state is reached, the measurement is started under the temperature and humidity conditions described above. 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. The oxygen permeability described in this specification can be measured using the same method as described above.

The water vapor transmission rate can be measured using a water vapor transmission rate measuring device under conditions of a temperature of 40 ° C. and a humidity of 90% RH in accordance with ISO-15106-5: 2015 (differential pressure method). As the water vapor transmission rate measuring device, for example, DELTAPERRM manufactured by Technolox, UK can be used. The measurement is carried out so that the surface located on the barrier layer side with respect to the film that can be thermally welded in the thickness direction of the outer packaging material on the outer packaging material surface is on the high humidity side (water vapor supply side). It is mounted between the upper chamber and the lower chamber, and the permeation area of 64 cm ² is performed under the above temperature and humidity conditions. For the water vapor transmission rate, at least three samples can be measured under one condition for the outer packaging material, and the average of these measured values can be used as the value of the water vapor transmission rate under that condition.

3. Protective layer A protective layer is a site | part used as the outermost layer (outermost layer) in the outer packaging material of this invention. The protective layer 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 the present invention, and has heat resistance, moisture resistance, and pin hole resistance. It is preferable that it has excellent puncture resistance and the like.

  The protective layer only needs to use a resin having a melting point higher than that of the heat welding layer, and may be a resin sheet or a uniaxially or biaxially stretched film. Examples of such protective layers include nylon resins, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyamide resins, polyolefin resins such as polypropylene, acrylic resins, cellulose resins, and ethylene vinyl alcohol copolymers. Examples thereof include a sheet or a film.

  The protective layer 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 layer may be subjected to a surface treatment such as a corona discharge treatment from the viewpoint of improving the adhesion with other layers.

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

4). Outer packaging material for vacuum heat insulating material In the outer packaging material of the present invention, the layers constituting the outer packaging material may be laminated in direct contact with each other, or may be laminated via an interlayer adhesive. About an interlayer adhesive agent, the adhesive agent generally used for the outer packaging material for vacuum heat insulating materials can be used.

  The outer packaging material may have a plurality of protective layers or barrier layers. In the outer packaging material, for example, two or more barrier layers may be provided between the heat-welded layer and the protective layer, and the first protective layer and the second protective layer are provided on the heat-welded layer and the barrier layer. Two or more protective layers may be provided. Further, the outer packaging material may be provided with an inner surface side protective layer between the heat welding layer and the barrier layer. Furthermore, the outer packaging material may have an arbitrary layer such as an anchor coat layer or a pinhole-resistant layer.

  The outer packaging material of the present invention may or may not have transparency, and can be appropriately set according to the use of the vacuum heat insulating material in which the outer packaging material is used. The transparency of the outer packaging material is not defined by a strict transmittance, and can be appropriately determined according to the application. When the outer packaging material has transparency, it is possible to visually recognize the inside of the vacuum heat insulating material by using it as a vacuum heat insulating material. It is possible to visually confirm the vacuum state.

  The method of laminating the outer packaging material is not particularly limited as long as it is a method that can laminate each layer so that one outermost layer has a protective layer and the other outermost layer has a heat-welded layer, A known method can be used. As the above laminating method, a dry lamination method in which each layer formed in advance is bonded using the above-described interlayer adhesive, or a material of each layer melted by extrusion is extruded and bonded using a T die or the like. For example, a method of bonding a heat-welded layer to the laminated body via an interlayer adhesive may be used.

II. 2nd aspect The 2nd aspect of the outer packaging material for vacuum heat insulating materials of this invention is an outer packaging material for vacuum heat insulating materials which has a heat welding layer, a barrier layer, and a protective layer in this order, Comprising: It is a polypropylene film (PP film) mainly composed of a polymer.

  In the outer packaging material for a vacuum heat insulating material of this embodiment, in FIG. 1, the heat welding layer 1 is a PP film containing a homopolymer as a main component.

The features and effects of the PP film described in the above section “1. First aspect” do not depend on whether or not the PP film is stretched. That is, if the polymer component which is the main component of the PP film is mainly composed of a homopolymer, the effects of the present invention can be achieved regardless of whether or not the film is stretched.
That is, according to this aspect, the polymer component of the PP film used as the heat welding layer is mainly composed of a homopolymer, so that the amount of volatile gas contained in the heat welding layer can be reduced, and the amount of volatile gas. The outer packaging material for a vacuum heat insulating material can be reduced. Moreover, since the outer packaging material for a vacuum heat insulating material according to this aspect can suppress a decrease in internal vacuum due to a gas volatilized from the heat-welded layer when used in a vacuum heat insulating material, it can be used in a high temperature environment or at a normal temperature. A vacuum heat insulating material that can maintain heat insulating performance for a long period of time can be formed.

  Hereinafter, each structure of the outer packaging material of this aspect is demonstrated. In addition, since it is the same as that of the content demonstrated in the term of "I. 1st aspect" except for the heat welding layer of the outer packaging material of this aspect, description here is abbreviate | omitted.

1. Thermal welding layer The thermal welding layer in this embodiment is a PP film containing a homopolymer as a main component.
As explained in the above section “I. First aspect 1. Thermal welding layer”, the amount of volatile gas of polypropylene varies depending on the polymer type of polypropylene, and the amount of volatile gas decreases as the amount of homopolymer increases. Can do. In other words, the amount of volatile gas in the polypropylene film depends on the type of polypropylene polymer contained in the polymer component of the film, and is presumed not to depend on whether or not the film is stretched.
In this aspect, by using a PP film containing a homopolymer as a main component as the heat-welded layer, the amount of volatile gas is larger than when the other polymer is used as a main component, regardless of whether or not the PP film is stretched. Can be reduced.

Here, in this embodiment, the PP film “having a homopolymer as a main component” means that the proportion of the PP homopolymer (homo PP) is the largest among the polymer components that are the main components of the PP film. That is, the ratio of components other than homo PP in the polymer component may be a ratio that enables the amount of volatile gas in the heat-welded layer to be within a predetermined range described later.
Specifically, it is sufficient that the content of units other than the propylene unit contained in the polymer component is small, and the content of units other than the propylene unit when the total polymer component of the PP film is 100% by mass is 1. It is preferably 0% by mass or less, more preferably 0.5% by mass or less, and further preferably 0.3% by mass or less. It is particularly preferable that the content of units other than the propylene unit is 0% by mass, that is, the polymer component of the PP film is only homo PP.
In addition, for details of the provision of “having a homopolymer as a main component” such as an example of a unit other than the propylene unit in the polymer component and a method for calculating the content of the unit other than the propylene unit in the polymer component, Since it is the same as that of the definition of “the polymer component is mainly composed of a homopolymer” described in the section of “I. First embodiment 1. Thermal welding layer”, the description here is omitted.

  In this embodiment, the heat-welded layer may be one containing homo-PP as a main component in the polymer component, may contain only homo-PP as the polymer component, and contains units other than the propylene unit in the polymer component. As long as the amount is within the above-described range, a copolymer such as block PP or random PP may be included as a polymer component in addition to homo PP. Moreover, the said heat welding layer may contain additives, such as an antiblocking agent, a lubricant, a flame retardant, and an organic filler other than a polymer component. The amount of the additive is not particularly limited as long as the polymer component is mainly used in the heat-welded layer, and can be, for example, 3% by mass or less with respect to 100% by mass of the total mass of the PP film.

  In the present embodiment, the heat-welded layer may be a stretched polypropylene film (OPP film) or an unstretched polypropylene film (CPP film) as long as it contains a homopolymer as a main component. Among these, a CPP film is preferable from the viewpoint of excellent heat sealability.

In this embodiment, the heat welding layer preferably has an amount of volatile gas at 90 ° C. of 15 mg / m ² or less, more preferably 10 mg / m ² or less, particularly 5 mg / m ² or less. The reason is as described in the above section “I. First aspect 1. Thermal weld layer”. Further, the amount of volatile gas at 90 ° C. can be quantified by the method described in the above section “I. First aspect 1. Thermal weld layer”, and can be at least the amount of organic components.

The heat welding layer in the present embodiment, in the infrared absorption spectrum, to the peak intensity of the absorption peak peak intensity is maximum around 1380 cm ^-1, a peak intensity at a wave number region of from 700 cm ^-1 to 790 cm ^-1 is a maximum The ratio of the peak intensities of a certain absorption peak is preferably 0.05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less. Of these to the peak intensity of the absorption peak peak intensity is maximum around 1380 cm ^-1, the ratio of the peak intensity of the absorption peak peak intensity is maximum around 725 cm ^-1 is preferably at 0.05 or less, preferably It is preferably 0.04 or less, particularly 0.03 or less. The reason for this is the same as the reason described in the above section “I. First aspect 1. Thermal weld layer”.

Here, the vicinity of 1380 cm ^-1, means a tolerance relative to the 1380 cm ^-1, it can be a wave number region of 1380cm ^-1 ± 10cm ^-1. Among these, a wave number region of 1380 cm ⁻¹ ± 5 cm ⁻¹ is preferable. Further, the vicinity of 725 cm ^-1, means a tolerance relative to the 725 cm ^-1, can be a wave number region of 725cm ^-1 ± 25cm ^-1. The allowable range may be ± 20 cm ⁻¹ , ± 15 cm ⁻¹ , or ± 10 cm ⁻¹ .

In the above-wave band region, when two or more absorption peak appears, the heat welding layer in the present embodiment, in the infrared absorption spectrum, the maximum peak intensity in the wave number region of from 700 cm ^-1 to 790 cm ^-1 A certain absorption peak (sometimes referred to as a maximum absorption peak) and an absorption peak having the second highest peak intensity (sometimes referred to as a second maximum absorption peak) are divided into a first absorption peak and a second absorption peak from the low wavenumber side. When the absorption peak having the maximum peak intensity in the vicinity of 1380 cm ^{−1 is} defined as the third absorption peak, the first absorption peak and the second absorption peak with respect to the peak intensity of the third absorption peak. It is preferable that the ratio of at least one of the peak intensities is 0.05 or less, particularly 0.04 or less, particularly 0.03 or less. Rukoto is preferable.
Among them, the absorption peak having the maximum peak intensity near 725 cm ⁻¹ and the absorption peak having the second highest peak intensity are defined as the first absorption peak and the second absorption peak from the low wavenumber side, and the peak intensity is near 1380 cm ^−1. When the maximum absorption peak is defined as the third absorption peak, the ratio of the peak intensity of at least one of the first absorption peak and the second absorption peak to the peak intensity of the third absorption peak is 0. It is preferably 05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less.
The reason for this is the same as the reason described in the above section “I. First aspect 1. Thermal weld layer”.

  It is sufficient that at least one of the first peak intensity ratio and the second peak intensity ratio is within the above range, and in particular, the first peak intensity ratio and the second peak intensity ratio are respectively within the above range. preferable.

Further, in this embodiment, the heat-welded layer has an absorption peak having a maximum peak intensity near 720 cm ⁻¹ as a first absorption peak and an absorption peak having a maximum peak intensity near 730 cm ⁻¹ as a second absorption peak. , At least one of the first absorption peak and the second absorption peak with respect to the peak intensity of the third absorption peak when the absorption peak having the maximum peak intensity in the vicinity of 1380 cm ^{−1 is} defined as the third absorption peak. The peak intensity ratio is preferably 0.05 or less, more preferably 0.04 or less, and particularly preferably 0.03 or less. At this time, at least one of the first peak intensity ratio and the second peak intensity ratio only needs to be within the above range, and among them, each of the first peak intensity ratio and the second peak intensity ratio is It is preferable to be within the range. The reason for this is the same as the reason described in the above section “I. First aspect 1. Thermal weld layer”.

Here, the vicinity of 720 cm ^-1, can be a wave number region of 720cm ^-1 ± ^{5cm -1,} is preferably a wave number region of inter alia 720cm ^-1 ± ^{2cm -1.} Further, the vicinity of the 730 cm ^-1, can be a wave number region of 730 cm ^-1 ± ^{5 cm -1,} it is preferably a wave number region of inter alia 730cm ^-1 ± ^{2cm -1.}

  The infrared absorption spectrum of the heat-welded layer in this embodiment can be measured by a single reflection ATR measurement method using a Fourier transform infrared spectrophotometer (FT-IR). About the measuring method, it is as having demonstrated in the term of the above-mentioned "I. 1st aspect 1. Thermal welding layer." In addition, the details of the infrared absorption spectrum of the heat-welded layer in this embodiment are as described in the above section “I. First embodiment 1. Heat-welded layer”.

  In this embodiment, the thickness of the heat welding layer can be the same as the thickness described in the above section “I. First embodiment 1. Heat welding layer”. In addition, a commercially available film may be used for the heat-welded layer, and a molded resin is formed by extrusion or the like using a polypropylene resin mainly composed of a homopolymer obtained by polymerizing propylene by a known method. The body may be used. The molded body may be unstretched or stretched.

B. Next, the vacuum heat insulating material of the present invention will be described. The vacuum heat insulating material 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, wherein the outer packaging material for vacuum heat insulating material includes a heat welding layer, a barrier layer, and It has a protective layer in this order, The said heat welding layer is an unstretched polypropylene film containing a homopolymer, It is characterized by the above-mentioned.

  Further, another aspect of the vacuum heat insulating material of the present invention is a vacuum heat insulating material having a core material and a vacuum heat insulating material outer packaging material that encloses the core material, wherein the vacuum heat insulating material outer material is a heat insulating material. It has a welding layer, a barrier layer, and a protective layer in this order, and the heat welding layer is a polypropylene film containing a homopolymer as a main component.

  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 is the above-described vacuum heat insulating material outer material of the present invention, so that the vacuum heat insulating material can maintain heat insulating performance for a long time in a high temperature environment or at normal temperature. It is possible to form a vacuum heat insulating material that can be formed.

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 heat insulating outer packaging material The vacuum heat insulating outer packaging material in 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. Such an outer packaging material for a vacuum heat insulating material can be the same as the contents described in the section of “A. Outer packaging material for a vacuum heat insulating material”, and thus description thereof is omitted here.
In addition, enclosing means sealing inside the bag formed using the said outer packaging material.

  The outer packaging material for a vacuum heat insulating material in the present invention may be the first mode or the second mode described in the section “A. Outer packaging material for a vacuum heat insulating 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 heat conductivity of the vacuum heat insulating material after deterioration at 90 ° C. for 1000 hours is preferably 15 mW / m · K or less, more preferably 11.5 mW / m · K or less. In addition, the said heat conductivity can be made into the value measured by the heat flow meter method using the heat conductivity measuring apparatus according to JIS-A-1412-2. 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.).

Specifically, the measurement of the thermal conductivity is performed by a method in accordance with JIS A1412-2: 1999 (Method for measuring thermal resistance and thermal conductivity of thermal insulation material-Part 2: Heat flow meter method (HFM method)). It can be measured under the following conditions using a thermal conductivity measuring device (for example, thermal conductivity measuring device Auto Lambda HC-074 (manufactured by Eihiro Seiki)). The measurement is performed by arranging so that both main surfaces of the measurement sample (vacuum heat insulating material) 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 29cm ± 0.5cm, length 30cm ± 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 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. The barrier performance of the vacuum heat insulating material is the same as the oxygen permeability and water vapor permeability described in the above-mentioned section “A. Outer packaging material for vacuum heat insulating material I. First aspect 2. Barrier layer”. The description in is omitted.

4). Manufacturing method As a manufacturing method of the vacuum heat insulating material of this 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-welded layers face each other, the core material is disposed therebetween, and the above-mentioned by a bag making machine or the like. Prepare a bag body that is formed of the two outer packaging materials by placing one of the outer circumferences of the core material as an opening and heat-welding the ends of the remaining three outer packaging materials, and in which the core material is arranged. Then, the bag body is attached to a vacuum sealing machine, and the opening is sealed in a state where the internal pressure of the bag body is reduced, whereby the core material is sealed with the outer packaging material. Is obtained.

  Further, in the above manufacturing method, one outer packaging material is opposed so that the heat-welded layer faces inward, the core material is disposed therebetween, and one of the outer circumferences of the core material is opened by a bag making machine or the like. Then, by heat-welding the ends of the remaining two outer packaging materials, a bag body formed of one outer packaging material and having the core material disposed therein is prepared, and then the bag body Even in a method of obtaining a vacuum heat insulating material in which the core material is enclosed by the outer packaging material by sealing the opening in a state where the internal pressure of the bag body is reduced, while mounting the vacuum sealing machine. good.

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 | parts which require heat insulation, such as a site | part which has a heat source and generate | occur | produces heat | fever, or a site | part which becomes high temperature by being heated from the outside. Applications of the present invention include, for example, equipment described in “C. Equipment with Vacuum Thermal Insulating Material”, cooler box, transportation container, fuel tank such as hydrogen, system bath, hot water tank, heat insulation box, residential wall, automobile, An airplane, a ship, a train, etc. are mentioned.

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 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 is a core material and a vacuum heat insulating material that encloses the core material. The outer packaging material for a vacuum heat insulating material has a thermal welding layer, a barrier layer, and a protective layer in this order, and the thermal welding layer is an unstretched polypropylene film containing a homopolymer. It is characterized by being.

  Moreover, another aspect of the article with a vacuum heat insulating material 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. A vacuum heat insulating material envelope, and the vacuum heat insulating material envelope includes a heat-welded layer, a barrier layer, and a protective layer in this order, and the heat-welded layer mainly comprises a homopolymer. It is a polypropylene film as a component.

  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. External packaging material for vacuum heat insulating material”, and is used in a high temperature environment or at a normal temperature for a long time. Since heat insulation performance can be maintained, it can be set as the article | item which has favorable heat insulation performance.

  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 of the present invention, and can maintain heat insulating performance for a long period of time in a high temperature environment or at room temperature. Heat from the heat source part is insulated by the vacuum heat insulating material to prevent the temperature of the entire device from becoming high. On the other hand, in the device having the heat retaining part, the temperature state of the heat retaining part is changed by the vacuum heat insulating material. Can keep. 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, and has at least a heat source part or a heat-retained part that reaches a high temperature in the range of 80 ° C to 150 ° C. Those are preferred. 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 is a natural refrigerant | coolant heat pump water heater, a commercial oven, a microwave oven, a motor vehicle, and the above-mentioned vacuum heat insulating material of this invention is used.

  As an aspect of mounting the vacuum heat insulating material on 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 heat insulating material between the heat retaining portion and the heat source portion or an external heat source. It may be mounted so as to sandwich it.

  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.

  The present invention will be described more specifically with reference to the following examples.

[Example]
(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 a heat welding layer / barrier layer / first protective layer / second protective layer was produced. In addition, “/” in the above layer configuration indicates a stacking interface.
A CPP film (thickness: 50 μm, product name: Treffan 3301, manufactured by Toray Film Processing Co., Ltd.) containing a homopolymer was used as the heat welding layer. As the barrier layer, an aluminum foil (Al thickness: 6 μm, product name: 8021, manufactured by UACJ Foil Company) was used. In addition, a nylon film (thickness: 25 μm, product name: Emblem ONBC, manufactured by Unitika) is used as the first protective layer, and a PET film (thickness: 12 μm, product name: Emblet PTMB, Unitika) is used as the second protective layer. Made).
Each of the above layers is an upper layer by applying the interlayer adhesive prepared at the above-mentioned blending ratio on the surface of the lower layer using a die coater so that the coating amount is 3.5 g / m ² and drying it. The layers were laminated by laminating.

(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.

[Comparative Example 1]
An outer packaging material was prepared and obtained in the same manner as in the above example except that a CPP film (thickness: 50 μm, product name: Treffan 3951, manufactured by Toray Film Processing Co., Ltd.) containing a random copolymer was used as the heat-welded layer. A vacuum heat insulating material was produced in the same manner as in the above example using the outer packaging material.

[Comparative Example 2]
An outer packaging material was prepared and obtained in the same manner as in the above example, except that a CPP film containing a block copolymer (thickness: 50 μm, product name: Treffan ZK99S, manufactured by Toray Film Processing Co., Ltd.) was used as the heat-welded layer. A vacuum heat insulating material was produced in the same manner as in the above example using the outer packaging material.

[Evaluation 1]
The heat conductivity of the vacuum heat insulating material obtained by the Example and Comparative Examples 1-2 was measured. The heat conductivity of each vacuum heat insulating material was made into the value measured by the heat flow meter method using the heat conductivity measuring apparatus according to JISA1412-2. As the thermal conductivity measuring device, a thermal conductivity measuring device Auto Lambda (product name HC-074, manufactured by Eihiro Seiki Co., Ltd.) was used. Specifically, in the state where both main surfaces of the fixed sample are oriented in the vertical direction using the above-described thermal conductivity measuring device, JIS A1412-2: 1999 (the thermal resistance and thermal conductivity of the thermal insulation material). The measurement was carried out under the following measurement conditions by a method based on the rate measurement method-Part 2: Heat flow meter method (HFM method)). Under one condition, three samples were measured, and the average of the measured values was taken as the value of thermal conductivity. The measurement results are shown in FIG.
(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

  From the measurement result of the thermal conductivity of the vacuum heat insulating material, the example using the CPP film containing the homopolymer as the heat-welded layer is compared with Comparative Example 1 using a random copolymer and Comparative Example 2 using a block copolymer. It can be seen that the thermal conductivity is low even after a long time, and the heat insulation performance is maintained high for a long time. A low thermal conductivity even after a long period of time means that there is little change over time in the degree of vacuum inside the vacuum heat insulating material, and other CPP films can be used by using homopolymer CPP films. It can be seen that a higher degree of vacuum can be maintained over a longer period than in the case of the above.

[Reference evaluation]
For various CPP films used as heat-welded layers in Examples and Comparative Examples 1 and 2, infrared absorption spectrum measurement is performed by a single reflection ATR measurement method using a Fourier transform infrared spectrophotometer (FT-IR), The absorption peak having the maximum peak intensity in the wave number region of 720 ± 5 cm ⁻¹ is defined as the first absorption peak B, and the absorption peak having the maximum peak intensity in the wave number region of 730 ± 5 cm ⁻¹ is defined as the second absorption peak C. The absorption peak having the maximum peak intensity in the wave number region of 1380 ± 10 cm ⁻¹ was defined as a third absorption peak A. The infrared absorption spectrum (FT-IR) measurement is carried out by measuring the infrared absorption spectrum of the heat-welded layer described in the above section “A. Outer packaging material for vacuum heat insulating material I. First aspect 1. Heat-welded layer” and Performed according to conditions.
The peak intensity I of the first absorption peak is I _B , the peak intensity of the second absorption peak is I _C , and the peak intensity of the third absorption peak is I _A. peak intensity ratio _I B / _{I a} of the peak intensity _{I B} of the first absorption peak for _a, and the peak intensity ratio of the peak intensity _{I C} of the third second absorption peak to the peak intensity _{I a} of the absorption peak _I C / _{I a} Were calculated respectively (Reference Examples 1 to 3). In addition, homo-PP film (thickness: 40 μm, product name: SC40, manufactured by Mitsui Chemicals, Inc.) and polyethylene film (thickness: 50 μm, product name: HC-E, manufactured by Mitsui Chemicals, Inc.) are similarly subjected to infrared absorption spectrum. It was measured, to calculate the peak intensity ratio _I B / _{I a} and _I C / _{I a} (reference example 4-5). The results are shown in Table 1 and FIG. FIG.7 (b) is an enlarged view of the wavy line part of Fig.7 (a).
In addition, the 1st absorption peak B of the reference examples 1 and 2 and the 2nd absorption peak C of the reference examples 3-5 are 700 cm < ^-1 > to 790 cm < ^- > in the infrared absorption spectrum of PP film used for each reference example, respectively. ^This corresponds to the maximum absorption peak in the wave number region up to ¹ .

  Further, for each PP film of Reference Examples 1 to 5, the amount of volatile gas at 90 ° C. (organic) by the method described in the above section “A. Outer packaging material for vacuum heat insulating material I. First aspect 1. Thermal welding layer” Ingredient amount) was measured. The results are shown in Table 1.

From the above results, homo PP film in which Example 1 and the peak intensity ratio _I B / _{I A} and _I C / _{I A} of Reference Example 4 are both 0.03 or less, reference examples containing PE 2 to 3 and showed a small value PE film and is compared with the peak intensity ratio _I B / _{I a} and _I C / _{I a} of reference example 5. From these results, it was suggested that Reference Example 1 and Reference Example 4 did not contain PE or had a very low PE content (the polymer component was mainly composed of homo-PP). Moreover, from the measurement results (FIGS. 3 and 4) of the volatile gas amount using the same homo PP as in Table 1 and Reference Example 4, the homo PP film is compared with the block PP film and random PP film containing PE. It was suggested that the generation amount of volatile gas is very small.

The first absorption peak B of Reference Examples 1 and 2, the second absorption peak C of Example 3 to 5, respectively, the PP film used in each reference example, in the wave number region of from 700 cm ^-1 to 790 cm ^-1 Corresponds to the maximum absorption peak. 1380 maximum absorption peak at a wave number region of ± 10 cm ^-1 maximum ratio of the peak intensity of the absorption peak (reference example to the peak intensity _{I A,} in the wave number region of from 700 meters ^-1 to 790 cm ^-1 of the (third absorption peak) _I B / _{I a} in 1,2, even when comparing the _I C / _{I a)} in reference example 3-5, the peak intensity ratio of the homo-PP films in which reference examples 1 and 4, the copolymer The values were lower than the peak intensity ratios of Reference Examples 2 to 3 which are PP films containing and Reference Example 5 which is a PE film. Moreover, in the PP film, it was confirmed that the smaller the peak intensity ratio, the smaller the amount of volatile gas generated.

From these results, it is possible to maintain the degree of vacuum inside the vacuum heat insulating material by using a homo PP film with a small amount of volatile gas generation in the heat welding layer in the outer packaging material for vacuum heat insulating material. It was suggested that a higher degree of vacuum was maintained over a longer period than when a film was used. That is, the PP film in which the ratio of the maximum absorption peak in the wave number region from 700 m ⁻¹ to 790 cm ^{−1 with} respect to the peak intensity of the maximum absorption peak in the vicinity of 1380 cm ⁻¹ is a predetermined value or less is mainly composed of homo PP. It was confirmed that the film was suitable for a heat-weldable film in a vacuum insulation outer packaging material. Further, to the peak intensity of the maximum absorption peak at around 1380 cm ^-1, 720 cm peak intensity ratio of the maximum absorption peak in the vicinity of ^-1 _I B / _{I A,} and, to the peak intensity of the maximum absorption peak at around 1380 cm ^-1 The PP film in which the peak intensity ratios I _C / I _A of I _B / I _A ≦ 0.05 and I _C / I _A ≦ 0.05 are almost equal to PE in the vicinity of 730 cm ^−1. It was confirmed that homo-PP was the main component without containing, and it was suggested that it is suitable for a heat-weldable film in an outer packaging material for a vacuum heat insulating material.

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Thermal welding layer 2, 2A, 2B, ... Barrier layer 3, 3A, 3B ... Protective layer 10, 10A, 10B ... Outer packaging material for vacuum heat insulating materials (outer packaging material)
11 ... Core 20 ... Vacuum insulation

Claims (7)

An outer packaging material for a vacuum heat insulating material having a heat welding layer, a barrier layer and a protective layer in this order,
An outer packaging material for a vacuum heat insulating material, wherein the heat-welded layer is a polypropylene film containing a homopolymer as a main component. The outer packaging material for a vacuum heat insulating material according to claim 1, wherein the amount of volatile gas at 90 ° C of the polypropylene film is 15 mg / m ² or less. The heat welding layer is, in the infrared absorption spectrum, with respect to the peak intensity of the absorption peak peak intensity is maximum in the wave number region of 1380 ± 10 cm ^-1, a peak intensity at a wavenumber region from 700 meters ^-1 to 790 cm ^-1 The envelope material for a vacuum heat insulating material according to claim 1 or 2, wherein a ratio of the peak intensity of the absorption peak that is the maximum is 0.05 or less. The heat welding layer is, in the infrared absorption spectrum, the absorption peak peak intensity is maximum and first absorption peak at a wave number region of 720 cm ^-1 ± ^{5 cm -1,}
The absorption peak having the maximum peak intensity in the wave number region of 730 cm ⁻¹ ± 5 cm ⁻¹ is defined as the second absorption peak,
When the absorption peak having the maximum peak intensity in the wave number region of 1380 ± 10 cm ⁻¹ is the third absorption peak,
The ratio of the peak intensity of at least one of the first absorption peak and the second absorption peak to the peak intensity of the third absorption peak is 0.05 or less, or any one of claims 1 to 3. The outer packaging material for a vacuum heat insulating material according to claim 1.   The ratio of the peak intensity of the first absorption peak to the peak intensity of the third absorption peak and the ratio of the peak intensity of the second absorption peak to the peak intensity of the third absorption peak are each 0.05. The outer packaging material for a vacuum heat insulating material according to claim 4, which is the following. A vacuum heat insulating material having a core material and a vacuum heat insulating material encapsulating the core material,
The outer packaging material for a vacuum heat insulating material has a heat welding layer, a barrier layer, and a protective layer in this order,
The heat insulation layer is a vacuum heat insulating material characterized in that it is a polypropylene film mainly composed of a homopolymer. 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 a vacuum heat insulating material has a heat welding layer, a barrier layer, and a protective layer in this order,
The article with a vacuum heat insulating material, wherein the heat welding layer is a polypropylene film containing a homopolymer as a main component.