JP6277583B2 - Vacuum insulation outer packaging, vacuum insulation, and equipment with vacuum insulation - Google Patents

Description

  The present invention relates to an outer packaging material for a vacuum heat insulating material having excellent adhesive strength and durability even at high temperatures, a vacuum heat insulating material using the same, and a device with a vacuum heat insulating material.

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 electrical products and the like is being promoted. In equipment that has a heat generating part inside the main body, such as electrical products, and equipment that has a heat retaining function using heat from the outside, it is possible to improve the heat insulation performance of the equipment as a whole by providing a vacuum heat insulating material It becomes. For this reason, efforts are being made to reduce the energy of devices such as electrical products by using vacuum heat insulating materials.

The vacuum heat insulating material is formed by encapsulating a core material in an outer packaging material, sealing the inside of the outer packaging material under reduced pressure to form a vacuum state, and thermally welding the end portions of the outer packaging material. By making the inside of the heat insulating material into a vacuum state, the heat conductivity of the gas is lowered and the heat transfer is blocked, so that the vacuum heat insulating material can exhibit high heat insulating performance.
Further, in order to maintain the heat insulating performance of the vacuum heat insulating material for a long time, it is necessary to maintain the inside of the outer packaging material in a high vacuum state for a long time. Therefore, the outer packaging material is required to have various functions such as a gas barrier property for preventing gas from permeating from the outside and a thermal adhesive property for covering and sealing the core material.
Therefore, the outer packaging material is configured as a laminate having a plurality of films having these functional characteristics. As an aspect of a general outer packaging material, a heat welding layer, a gas barrier layer, and a protective layer are laminated, and each layer is bonded through an adhesive or the like (Patent Document 1).

JP 2003-262296 A

However, in the case of a conventional vacuum heat insulating material, if it is used for a long time in a high temperature environment of 100 ° C. or higher, the heat-welded layer constituting the outer packaging material deteriorates, and peeling occurs at the end portion where the outer packaging material is bonded. . When the end part is peeled off, air and moisture penetrate into the inside, and the vacuum state inside the vacuum heat insulating material cannot be maintained, resulting in a decrease in heat insulating performance. Further, not only the deterioration of the heat-welded layer but also the strength of the outer packaging material itself decreases as the adhesive strength between the layers decreases.
For this reason, when used in a high temperature environment, there is a problem that the vacuum heat insulating material cannot maintain the heat insulating effect for a long time due to a decrease in the adhesive strength and durability of the outer packaging material.

  The present invention has been made in view of the above problems, and has an outer packaging material for vacuum heat insulating material having excellent adhesive force and durability even at high temperatures, a vacuum heat insulating material using the same, and a device with a vacuum heat insulating material The main purpose is to provide

  In order to solve the above-mentioned problems, in the present invention, a vacuum heat insulating outer packaging material having a heat-welded layer, a gas barrier layer, and a protective layer, wherein at least the heat-welded layer is laminated via an interlayer adhesive The heat-sealing layer has unstretched polypropylene, and the interlayer adhesive is an epoxy-based adhesive mainly composed of polyester urethane.

  According to the present invention, an unstretched polypropylene having heat resistance is used as a heat-welded layer of the outer packaging material for a vacuum heat insulating material, and an epoxy-based adhesive mainly composed of polyester urethane as an interlayer adhesive when the heat-welded layer is laminated. By using the agent, it is possible to suppress the deterioration of the outer packaging material for vacuum heat insulating material itself even when it is exposed to a high temperature for a long time. Moreover, the fall of the adhesive strength of the edge part which bonded the said outer packaging material for vacuum heat insulating materials is suppressed, and generation | occurrence | production of peeling in the said edge part can be prevented. Thereby, in the vacuum heat insulating material using the outer packaging material for vacuum heat insulating material of the present invention, the vacuum state inside the vacuum heat insulating material is maintained even in use under a high temperature environment for a long time, and the heat insulating effect is exhibited. Can do.

  In the said invention, it is preferable that the said unstretched polypropylene of the said heat welding layer is what shows 20 N or more in the tensile strength measurement based on the specification of JIS-Z-1707. This is because the unstretched polypropylene having the above-described tensile strength is used in combination with an epoxy-based adhesive mainly composed of polyester urethane, so that a high adhesive force can be maintained even at high temperatures and good durability can be exhibited.

  Further, in the present invention, 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 gas barrier layer, and a protective layer. A layer having at least the above-mentioned heat-welded layer laminated via an interlayer adhesive, the above-mentioned heat-welded layer has unstretched polypropylene, and the above-mentioned interlayer adhesive is an epoxy mainly composed of polyester urethane Provided is a vacuum heat insulating material characterized by being an adhesive.

  According to the present invention, in the vacuum heat insulating material that covers the core material using the above-described vacuum heat insulating outer packaging material and seals the end portion so that the inside is in a vacuum state, the vacuum heat insulating material is used at a high temperature for a long time. However, deterioration of the outer packaging material itself due to heat can be suppressed. Moreover, the adhesive force of the edge part which bonded the said outer packaging material for vacuum heat insulating materials can be hold | maintained by suppressing deterioration of a heat welding layer. For this reason, peeling does not occur at the end portion, and the internal vacuum state is maintained. Therefore, the vacuum heat insulating material of the present invention can exhibit heat insulating performance for a long time even when used at high temperatures.

  In the said invention, it is preferable that the said unstretched polypropylene of the said heat welding layer shows 20N or more in the tensile strength measurement based on the specification of JIS-Z-1707. This is because the unstretched polypropylene having the above-described tensile strength is used in combination with an epoxy-based adhesive mainly composed of polyester urethane, so that a high adhesive force can be maintained even at high temperatures and good durability can be exhibited.

  Further, in the present invention, a main body or an apparatus having a heat source part or an insulated part inside, and an apparatus with a vacuum heat insulating material provided with at least a vacuum heat insulating material, wherein the vacuum heat insulating material includes a core material and the core material And the vacuum insulation material outer packaging material has a heat welding layer, a gas barrier layer and a protective layer, and at least the heat welding layer is interposed between the interlayer adhesives. Provided a device with a vacuum heat insulating material, characterized in that it is laminated, the heat welding layer has unstretched polypropylene, and the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane To do.

According to the present invention, the above-described vacuum heat insulating material is less likely to be peeled off at the end where the outer packaging material for vacuum heat insulating material is bonded even when used at a high temperature for a long time. Since the state is maintained, an excellent heat insulating effect can be exhibited.
Therefore, in the equipment having a heat source part, the heat from the heat source part can be insulated by the vacuum heat insulating material, and the temperature of the whole equipment can be prevented from becoming high temperature. The temperature state of the heat retaining portion can be maintained by the vacuum heat insulating material.
Thereby, it can be set as the apparatus which has the high energy saving characteristic which suppressed power consumption.

In the said invention, it is preferable that the said unstretched polypropylene of the said heat welding layer shows 20N or more in the tensile strength measurement based on the specification of JIS-Z-1707. In the vacuum heat insulating material attached to the above-mentioned equipment, the heat-welded layer of the vacuum heat insulating outer packaging material has unstretched polypropylene exhibiting the above-mentioned tensile strength, so that it can be used in combination with an interlayer adhesive containing a predetermined material. Thus, even when exposed to a high temperature for a long time, the adhesive force at the end of the vacuum heat insulating material is maintained. For this reason, the said vacuum heat insulating material can maintain an internal vacuum state and can maintain heat insulation performance.
This is because the device provided with the vacuum heat insulating material can maintain high energy saving characteristics for a long period of time.

According to the present invention, in an outer packaging material for a vacuum heat insulating material, a heat-welding layer having unstretched polypropylene is laminated on a gas barrier layer or the like via an epoxy-based interlayer adhesive mainly composed of polyester urethane. Even under the effect, it is possible to have excellent adhesive strength and durability.
Further, the vacuum heat insulating material using the vacuum heat insulating material outer packaging material does not peel off the end portion even in a high temperature environment, and the internal vacuum state is maintained, so that the heat insulating performance can be maintained for a long time. There is an effect that can be done.
Furthermore, the apparatus with a vacuum heat insulating material using the vacuum heat insulating material has an effect that high energy saving characteristics can be maintained for a long time.

It is a schematic sectional drawing which shows the example of the outer packaging material for vacuum heat insulating materials of this invention. It is a schematic sectional drawing which shows the example of the vacuum heat insulating material of this invention.

  Hereinafter, the outer packaging material for 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.

A. First, the outer packaging material for vacuum heat insulating material of the present invention will be described. The outer packaging material for a vacuum heat insulating material according to the present invention is an outer packaging material for a vacuum heat insulating material having a heat welding layer, a gas barrier layer, and a protective layer, and at least the above heat welding layer is laminated via an interlayer adhesive. The heat-welded layer has unstretched polypropylene, and the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane.

The outer packaging material for a vacuum heat insulating material of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of an outer packaging material for a vacuum heat insulating material according to the present invention.
As illustrated in FIG. 1, an outer packaging material 10 for a vacuum heat insulating material according to the present invention is obtained by laminating a heat welding layer 1 having a non-stretched polypropylene, a gas barrier layer 3, and a protective layer 4. 1 and the gas barrier layer 3 are bonded through an interlayer adhesive 2. It is assumed that the outer packaging material 10 for a vacuum heat insulating material illustrated in FIG. 1 is laminated via the interlayer adhesive layer 2 also in other layers.
The interlayer adhesive 2 is an epoxy adhesive mainly composed of polyester urethane.

In the conventional outer packaging material for vacuum heat insulating material, the melting point of the resin used for the heat welding layer is low, and when used for a long time at a high temperature of 100 ° C. or more, the deterioration of the resin proceeds, and the outer packaging material for vacuum heat insulating material is used. There is a problem that peeling occurs at the bonded ends.
In addition, as an interlayer adhesive when laminating each layer of the heat welding layer, the gas barrier layer and the protective layer, resins such as acrylic, polyester, and silicon are mainly used. These interlayer adhesives and high melting point materials are used. Even the outer packaging material for a vacuum heat insulating material that is used in combination with the heat-sealing layer that is included cannot sufficiently obtain an effect of suppressing a decrease in adhesive strength at high temperatures, and peeling occurs at the end portion.
Furthermore, when used in a high temperature environment for a long time, since the adhesive strength between the layers of the outer packaging material for vacuum heat insulating material is reduced together with the deterioration of the heat-welded layer, the exterior material itself is deteriorated such that the tensile strength is reduced, There is a problem that it becomes difficult to have the desired durability.

On the other hand, according to the present invention, the combination of the heat-welding layer of the outer packaging material for the vacuum heat insulating material and the material of the interlayer adhesive can be used for the vacuum heat insulating material even when exposed to a high temperature environment for a long time. It has been found that the outer packaging material has the desired adhesive strength and durability.
That is, in the present invention, non-stretched polypropylene having high heat resistance is used as the heat welding layer of the vacuum insulation outer packaging material, and an epoxy-based adhesive mainly composed of polyester urethane is used as an interlayer adhesive when laminating the heat welding layer. By using the agent, the adhesive strength can be maintained at the end where the outer packaging material for a vacuum heat insulating material is bonded even when exposed to a high temperature environment for a long time, and the occurrence of peeling can be suppressed.
In addition, the combined use of the above-described heat-welded layer and the interlayer adhesive makes it possible to suppress the deterioration of the vacuum insulation outer packaging material itself, thereby improving the durability.

  The outer packaging material for a vacuum heat insulating material of the present invention has at least a heat welding layer, a gas barrier layer, a protective layer, and an interlayer adhesive. Each configuration will be described below.

1. Interlaminar Adhesive The interlaminar adhesive in the present invention is an epoxy adhesive mainly composed of polyester urethane. The interlayer adhesive is interposed when at least the thermal welding layer is laminated with another layer such as a gas barrier layer.

The interlayer adhesive in the present invention is an epoxy adhesive mainly composed of polyester urethane, and exhibits the physical properties described later. Therefore, even if it is exposed for a long time at a high temperature, peeling or the like does not occur at the end portion where the outer packaging material for vacuum heat insulating material is bonded, and it can have good adhesive strength. Therefore, it is possible to maintain a vacuum state without lowering the degree of vacuum inside the vacuum heat insulating material from the beginning of use.
The above-mentioned interlayer adhesive is usually a two-component curable adhesive containing a main agent and a curing agent, but is a one-part mixture of a latent curing agent that is blocked so that it does not react even when mixed with the main agent. It may be a curable adhesive or a one-component curable adhesive obtained by mixing a curing agent and a latent main agent blocked so as not to react even when mixed with a curing agent. As a method for blocking the main agent and the curing agent, a known method can be adopted.
Hereinafter, each composition of the interlayer adhesive in the present invention will be described.

(1) Main agent The main agent contains at least polyester urethane and an epoxy component.
The polyester urethane can be obtained from polyhydric alcohols, polybasic acids and isocyanate components.

Although it does not specifically limit as said polyhydric alcohol, For example, 2 such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, etc. A trihydric alcohol such as hydric alcohol, glycerin or trimethylolpropane, bisphenol A, bisphenol F, bisphenol S, or the like can be used. In the present invention, 1,4-butanediol, bisphenol A and bisphenol F are particularly preferable.
In addition, these polyhydric alcohols may be used independently and may be used in combination of 2 or more types arbitrarily.

The polybasic acid may be an aliphatic polybasic acid or an aromatic polybasic acid.
Examples of the aliphatic polybasic acid include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, hexahydrophthalic acid, tetrahydrophthalic acid, maleic acid, fumaric acid 1,10-decamethylene dicarboxylic acid, dodecanedioic acid, cyclohexane dicarboxylic acid, dimer acid and the like.
Examples of the aromatic polybasic acid include phthalic acid, isophthalic acid, terephthalic acid, orthophthalic acid, trimesic acid, pyromellitic acid, naphthalenedicarboxylic acid, benzoic acid, p-tertiarybutylbenzoic acid, phthalic anhydride, and anhydrous And trimellitic acid. In the present invention, adipic acid is particularly preferable.
In addition, these polybasic acids may be used independently and may be used in combination of 2 or more types arbitrarily.

The isocyanate component may be an aromatic isocyanate or an aliphatic isocyanate.
As aromatic isocyanates, p-phenylene diisocyanate, m-phenylene diisocyanate, p-xylene diisocyanate, m-xylene diisocyanate (MXDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-triisocyanate Range isocyanate (2,6-TDI), 4,4'-diphenylmethane diisocyanate (4,4'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI), tetramethylxylylene diisocyanate (TMXDI) , Tolidine diisocyanate (TODI), 1,5-naphthalene diisocyanate (NDI), or isomers thereof.
Examples of the aliphatic isocyanate include 1,6-hexamethylene diisocyanate, hydrogenated methylene diphenyl diisocyanate (HMDI), ethylene diisocyanate, isophorone diisocyanate, cyclohexane-1,4-diisocyanate. Examples thereof include narate, lysine diisocyanate, trimethylhexamethylenemethylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and norbornylene diisocyanate.
Among these, 2,4-tolylene diisocyanate (2,4-TDI) and 2,6-tolylene diisocyanate (2,6-TDI) are preferable as the isocyanate component.
In addition, the said isocyanate component may be used independently and may mix and use 2 or more types.

  Any epoxy component may be used as long as it has an epoxy group, such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, glycidyl. Ester-type epoxy resins and hydrogenated products thereof, glycidylamine-type epoxy resins and hydrogenated products thereof, copolymers of glycidyl (meth) acrylate and radical polymerizable monomers, polymers based on conjugated diene compounds or the like Partially hydrogenated polymer with epoxidized unsaturated carbon double bond, rubber modified epoxy resin containing rubber component such as NBR, CTBN, polybutadiene, acrylic rubber in the above epoxy group-containing resin, etc. Disclosed in JP-A-2005-290211 Epoxy components. In the present invention, bisphenol A type epoxy resin and bisphenol F type epoxy resin are particularly preferable.

  The content of the epoxy component with respect to the total weight of 100% by weight of the main component solids is in the range of 20% to 50% by weight, particularly in the range of 30% to 50% by weight, in particular 40% to 50% by weight. Within the range of is preferable. By making content of an epoxy component in the said range, since reaction with the hardening | curing agent mentioned later advances easily, it can be hardened in a short time. Moreover, since it has a suitable crosslinking density by reaction with the hardening | curing agent mentioned later, an interlayer adhesive force can be made high.

  The main agent may contain other monomer components and the like as necessary in addition to the materials described above. Examples of such a material include caprolactone.

The number average molecular weight of the main agent is preferably in the range of 25,000 to 95,000, and more preferably in the range of 30000 to 90000.
When the number average molecular weight of the main agent is smaller than the above range, the obtained interlayer adhesive may become hard and the adhesive strength may be lowered. On the other hand, if it is larger than the above range, it may not sufficiently react with the curing agent described later, and the heat resistance and the like of the resulting interlayer adhesive may be lowered.
The number average molecular weight is a value measured by gel permeation chromatography.

Further, the weight average molecular weight of the main agent is preferably in the range of 45,000 to 200,000, and more preferably in the range of 50,000 to 160000.
When the weight average molecular weight of the main agent is smaller than the above range, the initial cohesive force of the interlayer adhesive becomes insufficient, and floating may occur when the heat-welded layer and other layers are bonded. Therefore, peeling may occur at the end where the outer packaging material for vacuum heat insulating material is bonded. On the other hand, if it is larger than the above range, the initial cohesive force of the interlayer adhesive can be obtained sufficiently, but the viscosity may become too high to be applied.
The weight average molecular weight is a value measured by gel permeation chromatography.

(2) Curing agent The curing agent contained in the interlayer adhesive can be appropriately selected depending on the main agent described above. As a curing agent for curing the main component polyester urethane, it is preferable to include a polyisocyanate having at least two isocyanate groups, and it is preferable to include an aromatic polyisocyanate, particularly an aromatic having a urethane bond. It is preferable to contain a polyisocyanate. In addition, polyisocyanate contains an isocyanate component and a polyhydric alcohol component.

  Examples of the isocyanate component of the aromatic polyisocyanate include the same isocyanate components as those described in the above-mentioned section “(1) Main agent”. In the present invention, the isocyanate component is preferably 2,4-tolylene diisocyanate (2,4-TDI) or 2,6-tolylene diisocyanate (2,6-TDI). In addition, the said isocyanate component may be used independently and may mix and use 2 or more types.

  The polyhydric alcohol component that reacts with the isocyanate component preferably has 2 or more, preferably 2 to 3 hydroxyl groups in one molecule, such as dipropylene glycol, propylene glycol, 1,3-butane. Examples thereof include diol, 1,4-butanediol, and trimethylolpropane. These polyhydric alcohols may be used alone or in any combination of two or more.

  Moreover, as a hardening | curing agent which hardens | cures an epoxy component, the hardening | curing agent used for a general epoxy-type adhesive agent can be used, for example, a phenol type hardening | curing agent, an acid anhydride type hardening | curing agent, a latent hardening | curing agent, Examples thereof include diamine-based curing agents, photocationic polymerization initiators disclosed in JP-A-2005-290211, and aromatic isocyanates.

The blending amount of the curing agent in the interlayer adhesive is preferably an amount capable of sufficiently reacting with the above-described main agent, and is in the range of 5 to 40% by weight with respect to 100% by weight of the total weight of the main agent. In particular, it is preferably in the range of 10% by weight to 35% by weight, particularly preferably in the range of 15% by weight to 30% by weight.
By setting the blending amount of the curing agent within the above range, the curing reaction with the main agent can be sufficiently performed, the adhesive strength of the interlayer adhesive can be set to a desired size, and cracks can be generated in the vacuum insulation outer packaging material. Etc. can be avoided.

(3) Other materials In addition to the main agent and curing agent described above, the interlayer adhesive is an arbitrary material such as a curing accelerator, a catalyst, an antioxidant, a stabilizer, an ultraviolet absorber, a light stabilizer, and an antistatic agent. May be contained.

(4) Interlaminar Adhesive The melting point of the interlaminar adhesive is preferably higher than the use environment temperature of the outer packaging material for a vacuum heat insulating material of the present invention, preferably in the range of 200 ° C to 600 ° C. It is preferably within the range of 250 ° C to 500 ° C.
In addition, the glass transition temperature (Tg) of the interlayer adhesive is preferably in the range of −60 ° C. to 30 ° C., and more preferably in the range of −50 ° C. to 20 ° C.
By setting the melting point and glass transition temperature of the interlayer adhesive within the above ranges, the interlayer adhesive has flexibility and elasticity, so that it can follow a desired shape when forming the vacuum heat insulating material. Moreover, since the wettability with each layer constituting the outer packaging material for a vacuum heat insulating material is improved under the use temperature, it is possible to have a high adhesive force at an end portion where the outer packaging material for a vacuum heat insulating material is bonded. For this reason, even if it exposes for a long time under high temperature, generation | occurrence | production of peeling etc. can be prevented in the said edge part.
Furthermore, even in an environment where a heat cycle (thermal shock) in which a low temperature and a high temperature are repeated occurs, deterioration of the outer packaging material for a vacuum heat insulating material can be suppressed.
In addition, melting | fusing point and glass transition temperature of the said interlayer adhesive are the values measured by differential operation calorimetry (DSC).

The decomposition temperature of the interlayer adhesive is preferably in the range of 250 ° C to 600 ° C, and more preferably in the range of 300 ° C to 550 ° C.
By setting the decomposition temperature of the interlayer adhesive in the above range, the interlayer adhesive deteriorates due to heat in the normal use environment of the vacuum heat insulating material, and the adhesive force of the bonding surface of the vacuum insulating material outer packaging material decreases. This is because it can be prevented.
The decomposition temperature of the interlayer adhesive is a value measured by differential thermal-thermogravimetric simultaneous measurement (TG-DTA).

The interlayer adhesive is used as an adhesive when laminating at least the heat welding layer on another layer in contact with the heat welding layer. The other layer in contact with the heat-welded layer is usually a gas barrier layer, but may be a layer such as an anchor coat layer or a pinhole-resistant layer. Furthermore, the interlayer adhesive is preferably used as an adhesive between the layers constituting the outer packaging material for a vacuum heat insulating material of the present invention as well as between the heat-welded layer and other layers in contact with the heat-welded layer. . This is because, when the outer packaging material for vacuum heat insulating material is bonded, it is possible to prevent peeling between the respective layers.
The adhesive strength of the interlayer adhesive is preferably 0.5N or more, more preferably 3N or more, and particularly preferably 5N or more. When the adhesive strength of the interlayer adhesive is within the above range, it is possible to suppress the occurrence of peeling between the thermal welding layer and the other layers.
In addition, the said adhesive force is the value measured based on JIS-Z-1707.

The interlayer adhesive may be a layered film or the like in advance, and a coating solution prepared by mixing the above-mentioned interlayer adhesive material in a desired solvent is prepared, and the thermal welding layer is laminated on another layer. When performing, you may apply | coat directly on the surface of either layer.
Examples of the solvent include ethylene glycol monobutyl ether, propylene glycol monoethyl ether, diethylene glycol monobutyl ether, dihydric alcohol alkyl ethers such as diethylene glycol diethyl ether, propylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate. And ethers of dihydric alcohols such as benzyl alcohol and ethyl acetate.

Examples of the method for applying the interlayer adhesive include a roll coating method, a gravure roll coating method, a kiss coating method, and other coating methods.
The coating amount of the interlayer adhesive, can be set appropriately, usually, it is desirable that the 0.1g ^{/ m 2} ~10g ^/ m 2 approximately in the dry state.

2. Heat-welded layer The heat-welded layer in the present invention is laminated via an interlayer adhesive and has unstretched polypropylene.

Although the said heat welding layer has unstretched polypropylene, it is preferable that it is what has unstretched polypropylene in which the tensile strength measured based on the specification of JIS-K-1707 shows 20 N or more especially. In the following description, the unstretched polypropylene exhibiting the tensile strength may be abbreviated as “CPP for high retort”.
This is because the CCP for high retort is used in combination with the above-described epoxy-based adhesive mainly composed of polyester urethane, so that high adhesive force can be maintained even at high temperatures and good durability can be obtained.

The melting point of the heat-welded layer is preferably higher than the maximum temperature reached at the site where the vacuum heat insulating material is used, preferably in the range of 100 ° C. or higher and lower than 200 ° C., and more preferably 110 ° C. or higher and 180 ° C. or lower. It is preferably within the range, and particularly preferably within the range of 120 ° C. or higher and 170 ° C. or lower.
In addition, the glass transition temperature (Tg) of the heat-welded layer is preferably in the range of 30 ° C. or higher and 70 ° C. or lower, particularly preferably in the range of 35 ° C. or higher and 65 ° C. or lower, particularly 40 ° C. It is preferably within the range of 60 ° C. or lower.
When the melting point and the glass transition temperature of the heat-welded layer are within the above ranges, a desired shape can be followed when sealing with the outer packaging material for a vacuum heat insulating material of the present invention. In addition, because the wettability of the bonding surface of the vacuum heat insulating outer packaging material is increased under the operating temperature, it can exhibit a high adhesive force, and peeling or the like occurs at the end even when exposed to a high temperature for a long time. Can be prevented.

The thickness of the heat-welded layer is not particularly limited as long as it can increase the adhesive strength when the outer packaging material for vacuum heat insulating material is bonded by heat welding, and is preferably in the range of 20 μm to 100 μm, and more preferably 25 μm. Within the range of -90 micrometers is preferable, and the inside of the range of 30 micrometers-80 micrometers is especially preferable.
If the thickness of the heat-welded layer is larger than the above range, the gas barrier properties, the appearance, etc. of the entire outer packaging material for vacuum heat insulating material may be deteriorated. On the other hand, if it is smaller than the above range, the desired adhesive strength cannot be obtained, and peeling or the like may occur during long-term use at high temperatures.

  The heat welding layer may contain other materials such as an anti-blocking agent, a lubricant, a flame retardant, and an organic filler in addition to the above-described resin.

The said heat welding layer may be formed into a film by the method shown below, and the commercially available heat welding layer which has the composition mentioned above can also be used.
As a method for forming the heat-welded layer, any method can be used as long as it can be formed on another layer such as a gas barrier layer via an interlayer adhesive. Specific methods include, for example, a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die coextrusion molding method, a coextrusion lamination method, an inflation method, and the like. It is possible to form a film on another layer whose surface is coated with an interlayer adhesive, using a method such as a method for producing a film.

3. Gas barrier layer The gas barrier layer in this invention is normally formed between a heat welding layer and a protective layer. The gas barrier layer has a higher melting point than the heat-welded layer and has a gas barrier property that can seal the core material under reduced pressure.

Examples of the gas barrier layer include metal foils such as aluminum, nickel, stainless steel, iron, copper, and titanium. In addition, a resin film such as a polyvinyl alcohol resin film (PVA), a polyamide resin film (PA), an ethylene vinyl alcohol copolymer resin film (EVOH), or a polyethylene terephthalate resin film (PET) is used as a base material. It is also possible to use a vapor deposition film in which a vapor deposition layer such as a product or silicon oxide is laminated.
Furthermore, what provided the gas barrier coating film by the gas barrier composition containing the polyvinyl alcohol-type resin and / or ethylene vinyl alcohol copolymer in the above-mentioned vapor deposition film etc. can also be used.

  When using a metal foil as the gas barrier layer, the thickness of the metal foil is generally preferably 5 μm to 12 μm. By setting the thickness of the metal foil within the above range, heat conduction can be avoided and heat insulation can be maintained high.

  Moreover, as a method for forming a vapor deposition layer of metal or the like on the resin film, a general method can be used, and for example, vacuum vapor deposition, sputtering, ion plating, or the like can be used.

The gas barrier layer may be a single layer or a multilayer. When the gas barrier layer is a multilayer, it may be a laminate of layers made of the same material, or may be a laminate of layers made of different materials.
The thickness of the gas barrier layer is not particularly limited, but is generally about 9 μm to 100 μm.

  The gas barrier layer may be subjected to surface treatment such as corona discharge treatment, flame treatment, plasma treatment, and ozone treatment. This is because surface treatment of the gas barrier layer surface by the above-described method can improve gas barrier performance and adhesion with other layers.

Examples of the gas barrier properties of the gas barrier layer is preferably an oxygen permeability is less than 0.5cc ^/ m 2 · day, preferably not more than Above all 0.1cc ^/ m 2 · day. It is preferable that water vapor permeability is less than 0.2cc ^/ m 2 · day, preferably not more than Above all 0.1cc ^/ m 2 · day.
When the oxygen and water vapor permeability of the gas barrier layer is within the above-mentioned range, water vapor and oxygen that have permeated from the outside of the vacuum heat insulating material remain in the gas barrier layer and cannot penetrate to the inside of the vacuum heat insulating material. The vacuum state can be maintained.
The oxygen permeability is based on JIS-K-7126B, using an oxygen permeability measuring device (Oxtran, manufactured by Mocon, USA) under the conditions of a temperature of 23 ° C. and a humidity of 90% RH. It is a measured value.
The water vapor permeability is a value measured using a water vapor permeability measuring apparatus (manufactured by MOCON, USA, PERMATRAN) under the conditions of a temperature of 40 ° C. and a humidity of 90% RH.

4). Protective layer The protective layer in this invention is normally located outside the above-mentioned heat welding layer and gas barrier layer, that is, the outermost layer of the outer packaging material for vacuum heat insulating material of this invention.
The protective layer preferably has sufficient strength to protect the inside of the vacuum heat insulating material, and is excellent in heat resistance, moisture resistance, pinhole resistance, 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 sheet or a film. As such a protective layer, for example, a sheet or film of a nylon resin, a polyester resin, a polyamide resin, a polypropylene resin, etc., a nylon resin, an ethylene-vinyl alcohol copolymer, and a nylon resin are laminated in this order. Examples thereof include a film obtained by uniaxially stretching or biaxially stretching the coextruded stretched film.

The protective layer may have a single layer structure or a multilayer structure. When the protective layer has a multilayer structure, it may have a multilayer structure by laminating layers made of the same material, or may have a multilayer structure by laminating layers made of different materials. .
The protective layer may be subjected to surface treatment such as corona discharge treatment, flame treatment, plasma treatment, ozone treatment, and the like. This is because the surface of the protective layer can be surface-treated by the above-described method to improve the adhesion with other layers.

  The thickness of the protective layer is not particularly limited as long as it can protect the heat-welded layer and the gas barrier layer, but is generally about 5 μm to 50 μm.

5). Vacuum insulation outer packaging material The vacuum insulation outer packaging material of the present invention is a combination of the above-mentioned heat-welding layer and interlayer adhesive, and the strength of the vacuum insulation outer packaging material itself even when used at high temperatures for a long time. It is possible to suppress deterioration and have excellent durability.
Specifically, the strength of the outer packaging material for vacuum heat insulating material is preferably 50 N or more, more preferably 80 N or more after deterioration at 130 ° C. for 1000 hours.
The tensile strength is: nylon film (film thickness 25 μm) / interlayer adhesive / PET film (film thickness 12 μm) / interlayer adhesive / aluminum foil (film thickness 6 μm) / interlayer adhesive / unstretched polypropylene (film thickness 50 μm). ) Is a value measured based on JIS-K-1707 for a sample of vacuum insulation outer packaging material laminated in this order.
Moreover, it is preferable that the reduction rate of the tensile strength after heating at 130 ° C. for 1000 hours with respect to the initial tensile strength before deterioration (under 25 ° C.) is in the range of 0% to 40%, and in particular, in the range of 0% to 30%. It is preferable that it is in the range of 0% to 25%.
Since the tensile strength after heat deterioration under a predetermined condition and the rate of decrease in strength are within the above-mentioned ranges, the outer packaging material for vacuum heat insulating material has sufficient adhesive strength even when exposed for a long time at high temperature. In addition, the occurrence of peeling hardly occurs at the bonded end portions. Moreover, the said outer packaging material for vacuum heat insulating materials becomes a durable thing, without a crack etc. generating on the surface.

The outer packaging material for a vacuum heat insulating material may have a plurality of protective layers or gas barrier layers. For example, two or more gas barrier layers may be provided between the heat welding layer and the protective layer, and two or more protective layers may be provided on the heat welding layer and the gas barrier layer. In addition to the protective layer as the outermost layer, another protective layer may be provided between the heat welding layer and the gas barrier layer.
Furthermore, the outer packaging material for a vacuum heat insulating material may have other constituent parts as needed in addition to the above-described heat welding layer, gas barrier layer, protective layer, and interlayer adhesive. Examples of other components include an adhesive for laminating having a composition different from that of an anchor coat layer, a pinhole-resistant layer, and an interlayer adhesive.

6). Manufacturing Method The manufacturing method of the outer packaging material for a vacuum heat insulating material of the present invention may be any method that can be laminated so that the outermost layer is a protective layer and the innermost layer is a heat-welded layer, and known methods can be used. . As the above method, a dry lamination method in which each layer formed in advance is bonded using the above-described interlayer adhesive, and each material of the heat-melted protective layer and gas barrier layer is extruded and bonded using a T-die or the like. And a method of bonding a heat-welded layer to the obtained laminate through an interlayer adhesive.

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 a vacuum heat insulating material envelope material that encloses the core material, wherein the vacuum heat insulating material outer material material includes a heat welding layer, a gas barrier layer, and It has a protective layer, at least the above-mentioned heat welding layer is laminated via an interlayer adhesive, the above-mentioned heat welding layer has unstretched polypropylene, and the above-mentioned interlayer adhesive has polyester urethane as a main component. It is an epoxy adhesive.

The vacuum heat insulating material of the present invention will be described with reference to the drawings. FIG. 2 is a schematic sectional view showing an example of the vacuum heat insulating material of the present invention.
As illustrated in FIG. 2, the vacuum heat insulating material 20 of the present invention includes a core material 11 and a vacuum heat insulating material outer packaging material 10. In the outer packaging material 10 for vacuum heat insulating material, a heat welding layer 1 having unstretched polypropylene, a gas barrier layer 3 and a protective layer 4 are laminated in this order, and the heat welding layer 1 is on the core material 11 side. Then, the core material 11 is sealed with the outer packaging material 10 for vacuum heat insulating material, the end 12 is thermally welded, and the inside is vacuum-sealed under reduced pressure.
Moreover, in the said outer packaging material 10 for vacuum heat insulating materials, the heat welding layer 1 is bonded to the gas barrier layer 3 via the interlayer adhesive 2 which is an epoxy-type adhesive which has polyester urethane as a main component. Note that the vacuum heat insulating material 20 illustrated in FIG. 2 uses the above-described interlayer adhesive 2 for bonding the gas barrier layer 3 and the protective layer 4 together.

  According to the present invention, in the vacuum heat insulating material that covers the core material using the above-described vacuum heat insulating outer packaging material and seals the end portion so that the inside is in a vacuum state, the vacuum heat insulating material is used at a high temperature for a long time. However, the deterioration of the heat-welded layer can be suppressed, and the adhesive strength of the end portion to which the above vacuum heat insulating material packaging material is bonded can be maintained. In addition, it is possible to suppress deterioration of the vacuum insulation outer packaging material itself. For this reason, since peeling does not occur at the end portion and the internal vacuum state is maintained, the vacuum heat insulating material of the present invention has durability and exhibits high heat insulating performance for a long time even when used at high temperatures. can do.

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

1. Vacuum insulation material outer packaging material The vacuum insulation material outer packaging material of the present invention encloses a core material. Moreover, the said outer packaging material for vacuum heat insulating materials has a structure and the characteristic demonstrated in the term of the "A. outer packaging material for vacuum heat insulating materials" mentioned above.
Among them, the heat-sealing layer constituting the outer packaging material for vacuum heat insulating material has an unstretched polypropylene exhibiting 20 N or more in tensile strength measurement based on the standard of JIS-Z-1707, that is, a CPP for high retort. Is preferred. The reason why the CPP for high retort is suitable is the same as the reason described in the section of “A. Outer packaging material for vacuum heat insulating material 2. Thermal welding layer” described above.

2. Core material The core material in this invention is enclosed with the outer packaging material for vacuum heat insulating materials.
The core material preferably has a low thermal conductivity. Among them, a porous material having a core material porosity of 50% or more, particularly 90% or more is preferable.
As the substance 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 them, 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, and phenol foam. 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 preferably used because they have low thermal conductivity and are easier to handle than powders.

  The core material may be used alone or may be 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 vacuum heat insulating material to have a reduced pressure 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 is 15 mW / m * K or less, Especially 10 mW / m * K or less In particular, it is preferably 5 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.
Further, the rate of decrease in the thermal conductivity of the vacuum heat insulating material after 1000 hours of degradation at 130 ° C. with respect to the initial thermal conductivity of the vacuum heat insulating material is preferably 20% or less, and more preferably 10% or less. It is preferable.
In addition, the said heat conductivity is the value measured by the heat flow meter method using the heat conductivity measuring apparatus auto-lambda (HC-074, Eihiro Seiki make) according to JIS-A-1412-3.

The vacuum heat insulating material preferably has a high gas barrier property. 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 gas barrier property of the vacuum heat insulating material is the same as the oxygen permeability and water vapor permeability described in the above-mentioned section of “A. Outer packaging material for vacuum heat insulating material 3. Gas barrier layer”, and the description thereof is omitted here. To do.

4). Manufacturing method As a manufacturing method of the vacuum heat insulating material of the present invention, a general method can be used. For example, the above-described vacuum insulation material outer packaging material is prepared in advance, the two heat insulation layers of the vacuum insulation material outer packaging material are opposed to each other, and the above-described core material is disposed therebetween, One end of the outer periphery of the core material is opened by a bag making machine or the like, and the end portions of the remaining three outer packaging materials for vacuum heat insulating material are thermally welded, and then attached to a vacuum sealing machine to reduce the internal pressure. A desired vacuum heat insulating material is obtained by sealing the opening in the state.

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, it can be used for a part that has a heat source and generates heat, or a part that becomes hot when heated from the outside. Applications of the present invention include, for example, equipment described in “C. Equipment Using Vacuum Thermal Insulating Materials”, cooler boxes, transportation containers, fuel tanks such as hydrogen, system baths, hot water tanks, heat storages, residential walls, Examples include automobiles, airplanes, ships, trains and the like.

C. Next, the apparatus with a vacuum heat insulating material of the present invention will be described. A device with a vacuum heat insulating material of the present invention is a device having a heat source part or a heat retaining portion in the main body or inside, and a device with a vacuum heat insulating material provided with at least a vacuum heat insulating material, wherein the vacuum heat insulating material is a core material, The outer packaging material for vacuum heat insulating material that encloses the core material, wherein the outer packaging material for vacuum heat insulating material has a heat welding layer, a gas barrier layer, and a protective layer, and at least the heat welding layer is an interlayer adhesive. The heat-welded layer has unstretched polypropylene, and the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane.

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, even if the above-described vacuum heat insulating material is used at a high temperature for a long time, the occurrence of peeling is unlikely to occur at the end where the outer packaging material for vacuum heat insulating material is bonded, and the inside of the vacuum heat insulating material is Since the vacuum state is maintained, an excellent heat insulating effect can be exhibited.
Therefore, in the equipment having a heat source part, the heat from the heat source part can be insulated by the vacuum heat insulating material, and the temperature of the whole equipment can be prevented from becoming high temperature. The temperature state of the heat retaining portion can be maintained by the vacuum heat insulating material.
Thereby, this invention can be set as the apparatus which has the high energy saving characteristic which suppressed power consumption.
Moreover, even when the vacuum heat insulating material mentioned above is exposed for a long time at high temperature, the said outer packaging material itself for vacuum heat insulating materials does not occur easily, and is excellent in durability. Therefore, the device with the vacuum heat insulating material can exhibit energy saving characteristics over a long period of time.

  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 among them, a device having at least a heat source part or a heat-retained part reaching a high temperature of about 100 ° C to 130 ° C is preferable. .
Examples of such devices include natural refrigerant heat pump water heaters (registered trademark “Ecocute”), refrigerators, rice cookers, pots, microwave ovens, commercial ovens, IH cooking heaters, electrical appliances such as OA devices, automobiles, and the like. It is done. Among them, it is preferable to use the above-described vacuum heat insulating material for a natural refrigerant heat pump water heater, a commercial oven, a microwave oven, and an automobile.

  As an aspect of mounting the vacuum heat insulating material on a device, the vacuum heat insulating material may be directly attached to a heat source portion or a heat retaining portion of the device, and sandwiched between the heat retaining portion and the heat source portion or an external heat source. It may be mounted in such a way.

  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 1]
(Preparation of interlayer adhesive)
A main component containing a polyester urethane obtained from tolylene diisocyanate, adipic acid and 1,4-butanediol, a main agent containing an epoxy component, and a curing agent containing an aromatic polyisocyanate containing tolylene diisocyanate as a constituent material, Ethyl acetate was mixed so that the weight blending ratio was main agent: curing agent: ethyl acetate = 10: 3: 10 to prepare a two-component curable epoxy adhesive (hereinafter referred to as an interlayer adhesive).

(Manufacture of outer packaging materials for vacuum insulation)
As the first protective layer, a 25 μm thick nylon film (product name: ONM, manufactured by Unitika Co., Ltd.) with easy adhesion treatment on both sides is applied to the easy adhesion surface of the interlayer adhesive prepared at the above blending ratio. It apply | coated and dried using the die-coater so that it might become 3.5 g / m < ² >. Thereafter, a PET film (product name: PET, manufactured by Unitika Co., Ltd.) having a film thickness of 12 μm whose both surfaces were subjected to easy adhesion treatment as a second protective layer was laminated on the surface of the first protective layer to which an interlayer adhesive was applied.
Next, an interlayer adhesive was similarly applied at a coating amount of 3.5 g / m ² on the PET (second protective layer) surface of the obtained two-layer film and dried. An Al foil having a film thickness of 6 μm (product name: 1N30 manufactured by Sumikara Aluminum Foil Co., Ltd.) was laminated as a gas barrier layer on the surface of the second protective layer to which the interlayer adhesive was applied.
Subsequently, an interlayer adhesive was similarly applied at an application amount of 3.5 g / m ² on the Al foil (gas barrier layer) surface of the obtained three-layer film and dried. As a heat welding layer, a CCP film for high retort (film thickness 50 μm) showing 20 N in tensile strength measurement based on the standard of JIS-Z-1707 is laminated on the surface of the gas barrier layer to which the interlayer adhesive is applied, and vacuum insulation An outer packaging material was obtained.

[Example 2]
As a 2nd protective layer, the PET film (Toray Film Processing Co., Ltd. product name: VM-PET) vapor-deposited on one side is used, a nylon film (1st protective layer) is formed on the PET surface, and an Al foil ( An outer packaging material for a vacuum heat insulating material was obtained in the same manner as in Example 1 except that the gas barrier layer was laminated.

[Example 3]
As the first protective layer, a nylon film with a film thickness of 15 [mu] m whose both surfaces are easily bonded is used, and as the second protective layer, a nylon film with a film thickness of 25 [mu] m whose both surfaces are easily bonded (product name: Toyobo Co., Ltd.). The outer packaging material for vacuum heat insulating materials was obtained like Example 1 except having used Harden film).

[Example 4]
Except for laminating an unstretched polypropylene film (thickness 30 μm) showing 15 N in the tensile strength measurement based on the standard of JIS-Z-1707 as the heat-welded layer, on the surface of the gas barrier layer coated with an interlayer adhesive, In the same manner as in Example 1, an outer packaging material for a vacuum heat insulating material was obtained.

[Comparative Example 1]
A vacuum was applied in the same manner as in Example 1 except that a two-component mixed polyester adhesive in which a main agent containing polyester as a main component and a curing agent containing an aliphatic polyisocyanate was mixed was used as an interlayer adhesive material. An outer packaging material for a heat insulating material was obtained.

[Evaluation]
The outer packaging materials for vacuum heat insulating materials obtained in Examples 1 to 4 and Comparative Example 1 were cut into A4 sizes and used as evaluation samples. The evaluation sample was set in a dry oven, and the tensile strength over time was evaluated in an environment of 130 ° C. Tensile strength was measured using a 180 degree peeling method using Tensilon, and the strength at a 15 mm width crosshead speed of 300 mm / min was measured.
Table 1 shows the results of evaluating each of the evaluation samples of Examples 1 to 4 and Comparative Example 1 based on the above evaluation method.

  From the effects described in the above examples, by using a heat-welded layer having unstretched polypropylene and an epoxy-based interlayer adhesive having the above-described components, a high adhesive force is maintained even at high temperatures, and good It is possible to provide an outer packaging material for a vacuum heat insulating material that can exhibit durability.

DESCRIPTION OF SYMBOLS 1 ... Thermal welding layer 2 ... Interlayer adhesive 3 ... Gas barrier layer 4 ... Protective layer 10 ... Outer packaging material for vacuum heat insulating materials 11 ... Core material 20 ... Vacuum heat insulating materials

Claims (6)

An outer packaging material for a vacuum heat insulating material having a heat welding layer, a gas barrier layer and a protective layer,
At least the heat welding layer is laminated via an interlayer adhesive,
The heat-welded layer has unstretched polypropylene;
An outer packaging material for a vacuum heat insulating material, wherein the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane.   The outer packaging material for a vacuum heat insulating material according to claim 1, wherein the unstretched polypropylene of the heat-welded layer exhibits 20 N or more in a tensile strength measurement based on a standard of JIS-Z-1707. A vacuum heat insulating material having a core material and a vacuum heat insulating material encapsulating the core material,
The outer packaging material for vacuum heat insulating material has a heat welding layer, a gas barrier layer and a protective layer,
At least the heat welding layer is laminated via an interlayer adhesive,
The heat-welded layer has unstretched polypropylene;
The vacuum heat insulating material, wherein the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane.   The vacuum heat insulating material according to claim 3, wherein the unstretched polypropylene of the heat-welded layer exhibits 20 N or more in a tensile strength measurement based on a standard of JIS-Z-1707. A device having a heat source part or a heat-retained part in the main body or inside, and a device with a vacuum heat insulating material comprising at least a vacuum heat insulating material,
The vacuum heat insulating material is a core material and a vacuum heat insulating material enclosing material for enclosing the core material,
The outer packaging material for vacuum heat insulating material has a heat welding layer, a gas barrier layer, and a protective layer,
At least the heat welding layer is laminated via an interlayer adhesive,
The heat-welded layer has unstretched polypropylene;
A device with a vacuum heat insulating material, wherein the interlayer adhesive is an epoxy adhesive mainly composed of polyester urethane.   The apparatus with a vacuum heat insulating material according to claim 5, wherein the unstretched polypropylene of the heat-welded layer exhibits 20 N or more in a tensile strength measurement based on a standard of JIS-Z-1707.