Exterior material for partition member, partition member, and structure

Abstract

To provide a sheath material for partition member which can improve the dimension stability in a high-temperature environment, a partition member and a structure using the same.SOLUTION: A sheath material 10 for partition member used for a partition member arranged between a plurality of heating elements includes a metal layer 1, an adhesive layer 2 and a heat-fusible layer 3 in this order. The adhesive layer contains a cured product of a urethane-based adhesive composition containing a polyol compound, an isocyanate compound and a hydrocarbon compound having one or two hydroxy-phenyl groups.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an exterior material for a partition member used in a partition member arranged between a plurality of heat generating elements, and to a partition member and a structure using the same. [Background technology]

[0002] In a structure having multiple heat generating elements, for example, a partition member for cooling the heat generating elements is disposed between the multiple heat generating elements. The partition member has, for example, a coolant and an exterior material that packages the coolant (for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 032697 [Patent Document 2] International Publication No. 2012 / 060031 [Patent Document 3] International Publication No. 2018 / 124231 Summary of the Invention [Problem to be solved by the invention]

[0004] The partition member is required to have dimensional stability in a high-temperature environment because it is disposed between multiple heating elements. If the partition member undergoes significant thermal deformation, the heating elements may be displaced or compressed, which may result in a deterioration in the performance of the heating elements.

[0005] The present disclosure has been made in consideration of the above-mentioned situation, and its main object is to provide an exterior material for a partition member that can improve dimensional stability in high-temperature environments, as well as a partition member and a structure using the same. [Means for solving the problem]

[0006] One embodiment of the present disclosure provides an exterior packaging material for a partition member used for a partition member arranged between multiple heating elements, the exterior packaging material for a partition member having, in this order, a metal layer, an adhesive layer, and a heat-weldable layer, the adhesive layer containing a cured product of a urethane-based adhesive composition that contains a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups.

[0007] Another embodiment of the present disclosure provides a partition member that is disposed between a plurality of heat generating elements, the partition member having a coolant and an outer casing that encapsulates the coolant, the outer casing being the above-described outer casing for a partition member.

[0008] Another embodiment of the present disclosure provides a structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements, wherein the partition member is the partition member described above. [Effects of the Invention]

[0009] The present disclosure can provide an exterior material for a partition member that can improve dimensional stability in a high-temperature environment, as well as a partition member and a structure that use the same. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic cross-sectional view illustrating an example of an exterior material for a partition member according to the present disclosure. [Figure 2] 1 is a schematic cross-sectional view illustrating an example of an exterior material for a partition member according to the present disclosure. [Figure 3] 1 is a schematic cross-sectional view illustrating an example of an exterior material for a partition member according to the present disclosure. [Figure 4] 1 is a schematic cross-sectional view illustrating a partition member according to the present disclosure. [Figure 5] 1 is a schematic cross-sectional view illustrating a structure according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the actual form, but these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the preceding drawings will be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0012] In this specification, when describing a mode in which another component is placed on a certain component, the terms "above" or "below" are used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween. Also, in this specification, when describing a mode in which another component is placed on the surface of a certain component, the terms "on the surface side" or "on the surface" are used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween.

[0013] In this specification, the term "sheet" also includes a member called a "film." In addition, the term "film" also includes a member called a "sheet." In addition, the numerical ranges in this specification are ranges of average values.

[0014] The exterior material for a partition member, the partition member, and the structure according to the present disclosure will be described in detail below.

[0015] A. Exterior materials for partition members The exterior packaging material for partition members in the present disclosure is an exterior packaging material for partition members used for partition members arranged between multiple heating elements, and has a metal layer, an adhesive layer, and a heat-weldable layer in this order, and the adhesive layer contains a cured product of a urethane-based adhesive composition that contains a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups.

[0016] The partition member exterior material of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic cross-sectional view showing an example of a partition member exterior material of the present disclosure. As shown in Fig. 1, the partition member exterior material 10 has a metal layer 1, an adhesive layer 2, and a heat-sealable layer 3, in this order. In the partition member exterior material 10, the adhesive layer 2 contains a cured product of a urethane adhesive composition containing a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups.

[0017] Here, a flexible exterior material is used as the exterior material for the partition member from the viewpoints of ease of sealing, flexibility, shape conformability, small size, light weight, etc. As such an exterior material, for example, an exterior material having a heat-sealable layer, an adhesive layer, and a metal layer in this order is known.

[0018] The inventors of the present disclosure conducted extensive research into the dimensional stability of partition members and discovered that the partition member may expand in high-temperature environments. The inventors of the present disclosure conducted further research to clarify the factors that cause the partition member to expand. Two factors are believed to be responsible for the expansion of the partition member. The first factor is that hydrolysis of the adhesive layer disposed between the heat-sealable layer and the metal layer in the exterior packaging material may generate gases such as carbon dioxide, which may result in an increase in the internal pressure of the partition member and cause the partition member to expand. The second factor is that hydrolysis of the adhesive layer disposed between the heat-sealable layer and the metal layer in the exterior packaging material may cause the components constituting the adhesive layer to break down into smaller molecules, which may allow components of a coolant such as water to penetrate the heat-sealable layer and the adhesive layer and come into contact with the metal layer, corroding the surface of the metal layer and generating hydrogen, which may result in an increase in the internal pressure of the partition member and causing the partition member to expand. Furthermore, when the adhesive layer contains a cured product of a urethane adhesive composition, hydrolysis of the adhesive layer becomes a problem, and furthermore, hydrolysis of the adhesive layer is accelerated in a high temperature environment.

[0019] In the partition member exterior material of the present disclosure, when the adhesive layer contains a cured product of a urethane-based adhesive composition, the urethane-based adhesive composition contains a hydrocarbon compound having one or two hydroxyphenyl groups. The hydrocarbon compound having one or two hydroxyphenyl groups has a rigid hydroxyphenyl group. Therefore, when the urethane-based adhesive composition contains a hydrocarbon compound having one or two hydroxyphenyl groups, the adhesive layer becomes rigid. Such a rigid adhesive layer has a relatively reduced free volume, which prevents the penetration and permeation of coolant components such as water. This is thought to reduce the opportunity for contact between the components constituting the adhesive layer and coolant components such as water, thereby suppressing hydrolysis of the adhesive layer. Furthermore, suppressing hydrolysis of the adhesive layer is thought to have the effect of continuously preventing contact with the metal layer due to the penetration and permeation of coolant components such as water. Therefore, when the partition member exterior material of the present disclosure is used in a partition member, it is possible to suppress the expansion of the partition member. Therefore, a partition member with excellent dimensional stability in high-temperature environments can be provided.

[0020] Hereinafter, each configuration of the exterior material for a partition member according to the present disclosure will be described.

[0021] 1.Adhesive layer The adhesive layer in the present disclosure is disposed between the metal layer and the heat-weldable layer, and contains a cured product of a urethane-based adhesive composition that contains a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups.

[0022] The urethane adhesive composition may be of one-component type or two-component type.

[0023] The polyol compound can be a polyol compound generally used in urethane adhesive compositions. Examples of polyol compounds include polyester polyol, polyether polyol, polycarbonate polyol, polyester polycarbonate polyol, polyether polycarbonate polyol, acrylic polyol, polyolefin polyol, polyurethane polyol, polymer polyol, and epoxy polyol. These may be used alone or in combination of two or more.

[0024] The isocyanate compound can be an isocyanate compound generally used in urethane adhesive compositions. Examples of the isocyanate compound include aliphatic isocyanate compounds and aromatic isocyanate compounds. The isocyanate compound may also be, for example, an adduct, an isocyanurate, a biuret, or an isocyanate-terminated urethane prepolymer. These compounds may be used alone or in combination of two or more.

[0025] Examples of aliphatic isocyanate compounds include hexamethylene diisocyanate (HDI), xylylene diisocyanate (XDI), pentane diisocyanate (PDI), isophorone diisocyanate (IPDI), etc. Examples of aromatic isocyanate compounds include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenylene polyisocyanate, etc.

[0026] In particular, when the urethane adhesive composition contains bisphenol, as described below, it is preferable to contain an aliphatic isocyanate compound. Aliphatic isocyanate compounds have better weather resistance than aromatic isocyanate compounds. Therefore, by containing an aliphatic isocyanate compound, durability can be improved.

[0027] As the hydrocarbon compound having one or two hydroxyphenyl groups, for example, a monocyclic hindered phenol compound or a bisphenol is preferably used.

[0028] The monocyclic hindered phenol compound is a compound that can function as a hindered phenol-based antioxidant. The monocyclic hindered phenol compound is a compound having bulky substituents at both ortho positions relative to the phenolic hydroxy group. Examples of the bulky substituent include a branched alkyl group. Examples of the branched alkyl group include a t-butyl group. Among these, the monocyclic hindered phenol compound is preferably dibutylhydroxytoluene (BHT).

[0029] The content of the monocyclic hindered phenol compound in the adhesive layer is appropriately set within a range that does not impair the adhesive strength of the adhesive layer, and may be, for example, 0.1% by mass or more and 5.0% by mass or less.

[0030] Preferably, the bisphenol is bisphenol A.

[0031] The content of bisphenol in the adhesive layer is appropriately set within a range that does not impair the adhesive strength of the adhesive layer, and may be, for example, from 0.1% by mass to 10.0% by mass.

[0032] Here, it can be confirmed by qualitative analysis using gas chromatography mass spectrometry (GC-MS) that the adhesive layer contains a cured product of a urethane-based adhesive composition containing a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups.

[0033] In this specification, the expression "a urethane adhesive composition contains a certain component" means that the component is detected when the adhesive layer is subjected to gas chromatography mass spectrometry (GC-MS).

[0034] If no carboxylic acid is detected when the adhesive layer is subjected to gas chromatography-mass spectrometry, the urethane adhesive composition preferably contains a monocyclic hindered phenol compound. That is, if the cured product of the urethane adhesive composition contained in the adhesive layer does not have an ester bond, the urethane adhesive composition preferably contains a monocyclic hindered phenol compound. Here, if no carboxylic acid is detected in the adhesive layer, the main skeleton of the cured product of the urethane adhesive composition contained in the adhesive layer is composed of ether urethane. In this case, compared to when the main skeleton is composed of ester urethane, the hydrolysis resistance is higher, but the cohesive strength is lower, resulting in a larger free volume. In contrast, as described above, if the urethane adhesive composition contains a monocyclic hindered phenol compound with large steric hindrance, the free volume of the adhesive layer can be reduced. This is thought to prevent the penetration and permeation of coolant components such as water, thereby enhancing the effect of suppressing hydrolysis of the adhesive layer.

[0035] On the other hand, if carboxylic acid is detected when gas chromatography-mass spectrometry is performed on the adhesive layer, the urethane adhesive composition preferably contains a bisphenol. That is, if the cured product of the urethane adhesive composition contained in the adhesive layer has an ester bond, the urethane adhesive composition preferably contains a bisphenol. Here, if carboxylic acid is detected in the adhesive layer, the main skeleton of the cured product of the urethane adhesive composition contained in the adhesive layer is composed of an ester urethane. In this case, the hydrolysis resistance is lower than when the main skeleton is composed of an ether urethane. After hydrolysis of the adhesive layer, penetration of coolant components, particularly water, is likely to progress. However, if the adhesive layer can maintain a rigid structure after hydrolysis, penetration of coolant components, such as water, can be suppressed. When the urethane adhesive composition contains a bisphenol having two hydroxyphenyl groups, the bisphenol contributes to maintaining the rigid structure of the adhesive layer after hydrolysis, thereby preventing penetration of coolant components, such as water, and thus enhancing the effect of suppressing hydrolysis of the adhesive layer.

[0036] Furthermore, when the urethane adhesive composition contains a monocyclic hindered phenol compound, it is preferable that the urethane adhesive composition also contains an epoxy resin. Although ether urethanes have lower heat resistance than ester urethanes, it is believed that the heat resistance can be improved by including an epoxy resin in the urethane adhesive composition.

[0037] The epoxy resin is preferably bisphenol A diglycidyl ether.

[0038] The content of the epoxy resin in the adhesive layer may be, for example, 0.1% by mass or more and 10.0% by mass or less.

[0039] Whether the adhesive layer contains a cured product of a urethane adhesive composition containing an epoxy resin can be confirmed by qualitative analysis using gas chromatography mass spectrometry (GC-MS).

[0040] The adhesive layer may contain additives such as a curing accelerator, a catalyst, a stabilizer, an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, a silane coupling agent, a filler, and a lubricant, as necessary.

[0041] The thickness of the adhesive layer may be any thickness that can exhibit the desired adhesive strength, and can be set appropriately depending on the composition of the adhesive layer, etc. The thickness of the adhesive layer may be, for example, 1 μm or more and 10 μm or less.

[0042] Here, the thickness of the adhesive layer is a value measured from a cross section in the thickness direction of the partition member packaging material observed with a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM), and can be the average value of thicknesses at 10 randomly selected locations. Note that the same method can be used to measure the thicknesses of other layers in the partition member packaging material.

[0043] A method for forming the adhesive layer includes, for example, applying a liquid adhesive composition to one surface of the metal layer or the heat-weldable layer, drying the composition, pressing the metal layer and the heat-weldable layer together via the adhesive composition, and curing the adhesive composition.

[0044] 2. Metal layer The metal layer in the present disclosure is a member that can exhibit gas barrier properties against gases such as oxygen and water vapor.

[0045] The metal layer may be, for example, a metal foil, or may have a resin substrate and a metal film disposed on one surface of the resin substrate.

[0046] (1) Metal foil Examples of the metal foil include metal foils containing metals such as aluminum, nickel, stainless steel, iron, copper, and titanium, or alloys thereof, etc. Among these, metal foils containing aluminum or alloys thereof are preferred.

[0047] The thickness of the metal foil is not particularly limited as long as it can exhibit the desired gas barrier performance, and is appropriately set depending on the type of metal foil. For example, in the case of a metal foil containing aluminum or its alloy, the thickness of the metal foil is preferably 2 μm or more and 100 μm or less, more preferably 5 μm or more and 50 μm or less, and even more preferably 6 μm or more and 15 μm or less, from the viewpoints of gas barrier performance and cost.

[0048] (2) Resin substrate and metal film Examples of the metal film include metal films containing metals such as aluminum, nickel, stainless steel, iron, copper, and titanium, or alloys of these metals.

[0049] The metal film may be a single layer or a multilayer.

[0050] The thickness of the metal film is not particularly limited as long as it can exhibit the desired gas barrier performance, and is appropriately set depending on the type of metal film. For example, when the metal film is an aluminum film, the thickness of the metal film is preferably 10 nm or more and 250 nm or less, more preferably 20 nm or more and 200 nm or less, and even more preferably 40 nm or more and 150 nm or less, from the viewpoints of gas barrier property, adhesion to the resin substrate, and crack resistance.

[0051] The metal film is usually disposed so as to be in direct contact with the resin substrate, and may be, for example, a vapor-deposited film or a coated film.

[0052] The resin substrate is not particularly limited as long as it can support the metal film. Examples of resins constituting the resin substrate include polyolefin resins such as polyethylene (PE) and polypropylene (PP); polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); cyclic polyolefin resins; polystyrene resins; acrylonitrile-styrene copolymers (AS resins); acrylonitrile-butadiene-styrene copolymers (ABS resins); poly(meth)acrylic resins; polycarbonate resins; polyvinyl alcohol-based resins such as polyvinyl alcohol (PVA) and ethylene-vinyl alcohol copolymers (EVOH); saponified ethylene-vinyl ester copolymers; polyamide resins such as various nylons; polyimide resins; polyurethane resins; acetal resins; and cellulose resins.

[0053] The resin substrate may be subjected to a surface treatment to improve adhesion to the metal film.

[0054] The thickness of the resin substrate is not particularly limited and can be set appropriately, and may be, for example, 10 μm or more and 150 μm or less.

[0055] When the metal layer has a resin substrate and a metal film, the metal layer may be arranged so that the metal film is on the heat-weldable layer side, or so that the resin substrate is on the heat-weldable layer side.

[0056] When the metal layer is arranged so that the resin substrate faces the heat-weldable layer, even if the adhesive layer deteriorates due to hydrolysis, the resin substrate can suppress the penetration of components of the coolant, such as water. Therefore, when the partition member exterior material is used for a partition member, expansion of the partition member can be further suppressed.

[0057] On the other hand, if the metal layer is positioned so that the metal film faces the heat-weldable layer, when the adhesive layer deteriorates due to hydrolysis, components of the coolant, such as water, will easily penetrate the adhesive layer and come into contact with the metal film. Therefore, in this case, the effects of the present disclosure are significantly demonstrated. Furthermore, because the metal layer has barrier properties, it is possible that components of the coolant, such as water, will leak out from the edge of the layer located closer to the heat-weldable layer than the metal film. In contrast, in the above case, the total thickness of the layers located closer to the heat-weldable layer than the metal film can be reduced, thereby preventing components of the coolant, such as water, from leaking out from the edge of the layer located closer to the heat-weldable layer than the metal film. This allows for long-term dimensional stability.

[0058] 3. Heat-sealable layer In the present disclosure, the heat-sealable layer is a layer that can be welded by heating. When a partition member is produced using the exterior packaging material for a partition member in the present disclosure, the heat-sealable layer is a member that comes into contact with a coolant and joins the ends of opposing exterior packaging materials to each other when sealing in the coolant.

[0059] The heat-sealable layer may be a resin film that can be melted and fused by heating. Examples include polyolefin resin films such as polyethylene (e.g., linear short-chain branched polyethylene (LLDPE)) and polypropylene (e.g., unoriented polypropylene (CPP)); polyester resin films (e.g., polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT); polyvinyl acetate resin films; polyvinyl chloride resin films; poly(meth)acrylic resin films; and urethane resin films.

[0060] Among these, polyolefin resin films are preferred. As will be described later, the coolant enclosed in the partition member preferably contains water. Therefore, polyolefin resin films have good water resistance and are preferably used. Furthermore, from the viewpoint of the melting point of the heat-sealable layer, which will be described later, polypropylene is more preferred among polyolefin resins.

[0061] The heat-sealable layer may contain additives such as anti-blocking agents, lubricants, flame retardants, fillers, and the like.

[0062] The melting point of the heat-sealable layer varies depending on the material, but is preferably 120°C or higher, more preferably 130°C or higher, and even more preferably 140°C or higher. In a structure in which a partition member is disposed between multiple heat-generating elements, if one of the heat-generating elements generates abnormal heat, heat is released from the heat-generating element, causing the temperature of the partition member located near that heat-generating element to rise. If the temperature of the partition member exceeds the melting point of the heat-sealable layer, the heat-sealable layer melts, making the sealed portion of the partition member exterior material more likely to peel. Furthermore, as the temperature of the partition member rises, the temperature of the coolant enclosed in the partition member also rises, increasing the vapor pressure of the coolant and causing an increase in the internal pressure of the partition member. If the internal pressure of the partition member exceeds the welding strength of the heat-sealable layer at the sealed portion of the partition member exterior material, the sealed portion of the partition member exterior material is more likely to peel. Furthermore, as described below, the coolant preferably contains water. Therefore, if the melting point of the heat-sealable layer is within the above range, peeling of the sealing portion of the partition member exterior material can be suppressed in the above structure under normal conditions.

[0063] On the other hand, the melting point of the heat-sealable layer is, for example, preferably 250°C or lower, more preferably 200°C or lower, and even more preferably 170°C or lower. If the melting point of the heat-sealable layer is within the above range, in the above structure, the sealed portion of the partition member exterior material is more likely to peel off in the event of abnormal heat generation. When the sealed portion of the partition member exterior material peels off, the coolant is released from the partition member, thereby cooling the abnormal heat-generating element. This makes it possible to suppress thermal runaway.

[0064] The melting point of the heat-sealable layer can be measured using a differential scanning calorimeter (DSC) by the following method. First, the heat-sealable layer is peeled off from the partition member exterior material to obtain approximately 10 mg of a sample. This sample is placed in an aluminum cell and, using a differential scanning calorimeter, heated from 20°C to 300°C at a heating rate of 10°C / min under a nitrogen atmosphere and held at that temperature for 10 minutes. The sample is then cooled to 20°C at a heating rate of 10°C / min, held at that temperature for 10 minutes, and then heated again to 300°C at a heating rate of 10°C / min (second heating). The melting point of the heat-sealable layer can be determined by the intersection of the tangent to the melting point observed during the second heating and the baseline of the DSC curve below the melting point. For example, a DSC204 manufactured by NETZSCH can be used as the differential scanning calorimeter.

[0065] The thickness of the heat-sealable layer may be any thickness that allows the desired adhesive strength to be obtained when the partition member exterior materials are joined together, and is, for example, preferably 15 μm or more and 150 μm or less, more preferably 25 μm or more and 120 μm or less, and even more preferably 30 μm or more and 80 μm or less.

[0066] 4. Resin layer In the present disclosure, for example, as shown in FIG. 2, the exterior packaging material 10 for a partition member may have a resin layer 4 between the adhesive layer 2 and the heat-sealable layer 3.

[0067] When a resin layer is disposed between the adhesive layer and the heat-sealable layer, even if the adhesive layer is deteriorated due to hydrolysis of the adhesive layer, the resin layer can suppress the penetration of components of a coolant such as water. Therefore, when the exterior material for a partition member is used for a partition member, expansion of the partition member can be further suppressed.

[0068] On the other hand, if a resin layer is not disposed between the adhesive layer and the heat-sealable layer, when the adhesive layer deteriorates due to hydrolysis, components of a coolant such as water will easily penetrate the adhesive layer and come into contact with the metal layer. Therefore, in this case, the effects of the present disclosure are significantly demonstrated. Furthermore, because the metal layer has barrier properties, it is possible that components of a coolant such as water will leak out from the edge of the layer located closer to the heat-sealable layer than the metal layer. In contrast, the absence of a resin layer allows the total thickness of the layers located closer to the heat-sealable layer than the metal layer to be reduced, thereby preventing components of a coolant such as water from leaking out from the edge of the layer located closer to the heat-sealable layer than the metal layer. This allows for long-term dimensional stability.

[0069] When no resin layer is disposed between the adhesive layer and the heat-weldable layer, the metal layer and the heat-weldable layer are in direct contact with each other via the adhesive layer.

[0070] The resin layer may be the same as the resin substrate constituting the metal layer or the protective layer described below.

[0071] 5. Second adhesive layer In the present disclosure, for example, as shown in FIG. 2, the exterior packaging material 10 for a partition member may have a second adhesive layer 5 between the resin layer 4 and the heat-sealable layer 3.

[0072] The second adhesive layer is preferably the same as the adhesive layer described above.

[0073] 6.Protective layer In the present disclosure, as shown in FIG. 3, for example, the exterior packaging material 10 for a partition member can have a protective layer 6 on the surface of the metal layer 1 opposite to the adhesive layer 2.

[0074] The protective layer may be a resin film, such as a polyester resin film made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polybutylene terephthalate (PBT); or a polyamide resin film made of nylon.

[0075] The thickness of the protective layer is not particularly limited, and may be, for example, 5 μm or more and 200 μm or less, or 10 μm or more and 100 μm or less.

[0076] 7. Third adhesive layer In the present disclosure, as shown in FIG. 3, for example, the exterior packaging material 10 for a partition member may have a third adhesive layer 7 between the protective layer 6 and the metal layer 1.

[0077] The adhesive constituting the third adhesive layer may be, for example, a pressure-sensitive adhesive, a thermoplastic adhesive, a curable adhesive, etc. Specific examples include epoxy adhesives, polyvinyl acetate adhesives, polyacrylic ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, urethane adhesives, reactive (meth)acrylic acid adhesives, inorganic rubber adhesives, silicone adhesives, and inorganic adhesives made of alkali metal silicates, low-melting-point glass, etc.

[0078] The adhesive may contain additives such as a curing accelerator, a catalyst, an antioxidant, a stabilizer, an ultraviolet absorber, a light stabilizer, and an antistatic agent.

[0079] The thickness of the third adhesive layer can be the same as that of the above adhesive layer, and can be set appropriately depending on the composition of the third adhesive layer, etc., as long as it can exhibit the desired adhesive strength.

[0080] The third adhesive layer may be a sheet-like adhesive, or may be formed by applying a liquid adhesive to one side of the metal layer or the protective layer, drying it, pressing the metal layer and the protective layer together via the adhesive, and then hardening the adhesive.

[0081] 8.Exterior materials for partition members A method for producing an exterior material for a partition member according to the present disclosure includes, for example, preparing each layer, such as a heat-sealable layer, a metal layer, a resin layer, and a protective layer, in advance, and bonding the layers together via an adhesive layer.

[0082] The exterior material for a partition member according to the present disclosure can be used for a partition member disposed between a plurality of heat generating elements. In the partition member, the exterior material for a partition member can be disposed opposite the heat-sealable layer with the coolant interposed therebetween, with the heat-sealable layer facing the coolant.

[0083] B. Partition material The partition member in the present disclosure is a partition member that is placed between multiple heat generating elements, and has a coolant and an exterior material that encapsulates the coolant, and the exterior material is the above-mentioned exterior material for a partition member.

[0084] Fig. 4 is a schematic cross-sectional view showing an example of a partition member according to the present disclosure. As shown in Fig. 4, partition member 20 has coolant 21 and exterior packaging material 10 that encloses coolant 21, and exterior packaging material 10 is, for example, an exterior packaging material for a partition member as shown in Fig. 1. Partition member 20 is a bag formed by two sheets of exterior packaging material 10 facing each other with their heat-sealable layers facing each other and having their ends 22 joined by heat welding, and coolant 21 is enclosed in the bag.

[0085] In the present disclosure, since the exterior packaging material is the above-described exterior packaging material for a partition member, the partition member has excellent dimensional stability in a high-temperature environment.

[0086] Hereinafter, each configuration of the partition member in the present disclosure will be described.

[0087] 1. Exterior materials The exterior material in the present disclosure is a member that seals a coolant in. The exterior material is similar to the exterior material for the partition member described above, and therefore a description thereof will be omitted here.

[0088] 2. Coolant The coolant in the present disclosure is a member enclosed by an exterior material. Enclosed means sealed inside a bag formed using the exterior material.

[0089] The coolant preferably contains at least one liquid selected from the group consisting of water, alcohols, esters, ethers, ketones, hydrocarbons, fluorine-based compounds, and silicone oils. These liquids may be used alone or as a mixture of two or more.

[0090] Examples of alcohols include alcohols containing 3 to 8 carbon atoms, such as propanol, isopropanol, butanol, benzyl alcohol, and phenylethyl alcohol; and dihydric or higher alcohols, such as alkylene glycols, such as ethylene glycol and propylene glycol. These may be used alone or as a mixture of two or more.

[0091] Examples of esters include alkyl aliphatic carboxylic acid esters, alkyl carbonate diesters, alkyl oxalic acid diesters, fatty acid esters of ethylene glycol, etc. These may be used alone or as a mixture of two or more.

[0092] Examples of ethers include n-butyl ether, n-propyl ether, isoamyl ether, etc. These may be used alone or as a mixture of two or more.

[0093] Examples of ketones include ethyl methyl ketone, diethyl ketone, etc. These may be used alone or as a mixture of two or more.

[0094] Examples of hydrocarbons include heptane, octane, nonane, decane, toluene, xylene, etc. These may be used alone or as a mixture of two or more.

[0095] Examples of fluorine-based compounds include refrigerants such as 1,1,2,2,3,3,4-heptafluorocyclopentane (HFC-c447ef) and 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane (HFC-76-13sf), which may be used alone or in combination of two or more.

[0096] Examples of silicone oils include modified silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, cyclic methylsiloxane, silicone polyether copolymer, etc. These may be used alone or as a mixture of two or more.

[0097] In particular, it is preferable that the coolant contains water. Since water has a large heat of vaporization, when the coolant contains water, the heat generating element can be cooled efficiently. In addition, water is chemically stable.

[0098] The coolant may be neutral, alkaline, or acidic. When the coolant is alkaline or acidic, the reaction between the coolant and the metal layer is likely to proceed, and the effects of the present disclosure are more pronounced.

[0099] The coolant may further contain a thickener. The thickener increases the viscosity of the coolant, so that when the heat generating element generates abnormal heat and the sealing portion of the exterior material peels off, releasing the coolant from the partition member, the coolant can be kept in contact with the heat generating element for a longer period of time. This allows the heat generating element to be cooled efficiently. Examples of thickeners include gelatin, xanthan gum, alginic acid, and carboxymethyl cellulose.

[0100] The coolant may also contain, for example, an antifreeze, a preservative, and a pH adjuster.

[0101] 3. Core material In the partition member of the present disclosure, the core material may be further enclosed in an exterior material.

[0102] The core material is preferably capable of retaining the coolant.

[0103] Examples of the core material include porous materials. The porous material preferably contains at least one of fibers and particles. Examples of porous materials containing fibers include paper, cotton sheets, polyimide fibers, aramid fibers, polytetrafluoroethylene (PTFE) fibers, glass wool, rock wool, ceramic fibers, and biosoluble inorganic fibers. Examples of porous materials containing particles include silica particles, alumina particles, calcium silicate, clay minerals, vermiculite, mica, cement, perlite, fumed silica, and aerogel. Examples of calcium silicate include xonotlite, tobermorite, wollastonite, and gyrolite. Examples of clay minerals include magnesium silicate, montmorillonite, and kaolinite. These materials may be used alone or in combination.

[0104] 4. Partition material The partition member of the present disclosure can be manufactured by a general method. For example, two of the above-described partition member exterior materials are prepared, and the heat-sealable layers of each partition member exterior material are stacked facing each other, and the outer edges of the three sides are heat-sealed to obtain a bag with an opening on one side. A coolant and a core material are poured into this bag through the opening, and the opening is then sealed to obtain the partition member.

[0105] The partition member of the present disclosure can be used by being disposed between a plurality of heating elements.

[0106] C.Structure The structure of the present invention is a structure having a plurality of heat generating elements and partition members arranged between the plurality of heat generating elements, and the partition members are the above-mentioned partition members.

[0107] Fig. 5 is a schematic cross-sectional view showing an example of a structure according to the present disclosure. As shown in Fig. 5, structure 30 has a plurality of heating elements 31 and partition members 20 arranged between the plurality of heating elements 31, and partition members 20 are, for example, partition members such as those shown in Fig. 4. Structure 30 may also have a housing 32 that houses the plurality of heating elements 31 and partition members 20. In structure 30, partition members 20 may also be arranged between the bottom surface of housing 32 and each heating element 32.

[0108] In the present disclosure, since the partition member is the above-described partition member, it has excellent dimensional stability in a high-temperature environment, and therefore the influence of the expansion of the partition member on the heat-generating element can be reduced.

[0109] Each component of the structure in this disclosure will be described below.

[0110] 1. Partition material The partition member in the present disclosure is a member disposed between a plurality of heat generating elements. The partition member is similar to the partition member described above, and therefore a description thereof will be omitted here.

[0111] 2. Heating element Examples of heating elements in the present disclosure include a battery, an integrated circuit, a control panel, a motor, and an engine.

[0112] Examples of the single cell include secondary batteries such as lithium ion secondary batteries, all-solid-state lithium ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries.

[0113] 3. Structure The uses of the structure in the present disclosure vary depending on the type of heating element.

[0114] For example, when the heating element is a secondary battery, the structure is a battery pack, which can be used as a power source for portable electronic devices, mobile communication devices, vehicles, etc.

[0115] Furthermore, for example, if the heating element is an integrated circuit, the structure would be a computer, etc. Furthermore, for example, if the heating element is a control panel, the structure would be various devices such as manufacturing equipment, etc. Furthermore, for example, if the heating element is a motor or engine, the structure would be a moving object such as a vehicle, etc.

[0116] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any configuration that is substantially identical to the technical idea described in the claims of the present disclosure and that provides similar effects is included within the technical scope of the present disclosure. [Example]

[0117] [material] The components constituting the exterior packaging materials of the examples and comparative examples are shown below. Protective layer: PET film (12 μm thick, Unitika "Emblet PTMB") Metal layer: Aluminum foil (thickness 12 μm, A1N30 material manufactured by Toyo Aluminum) Heat-sealable layer: Unstretched polypropylene film (CPP) (50 μm thick, Mitsui Chemicals Tocello "RXC22")

[0118] [Example 1] An adhesive composition was prepared by mixing a base agent containing polyester polyol and dibutylhydroxytoluene (BHT) ("LIS-7059" manufactured by Toyo-Morton Co., Ltd., solids concentration 50%), a curing agent containing an aliphatic isocyanate compound ("LCR-1032" manufactured by Toyo-Morton Co., Ltd., solids concentration 85%), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 50:2:55.

[0119] An exterior material having a heat-sealable layer, a metal layer, and a protective layer in this order was produced. Each layer was bonded with the adhesive composition described above. The adhesive layer was formed by applying the adhesive composition by gravure coating in an amount of 3.5 g / m. 2 The coating was applied so as to form the film.

[0120] [Example 2] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0121] An adhesive composition was prepared by mixing a base agent containing polyether polyol ("Takelac A1102" manufactured by Mitsui Chemicals, Inc.), a curing agent containing an aliphatic isocyanate compound and dibutylhydroxytoluene (BHT) ("Takenate A3070" manufactured by Mitsui Chemicals, Inc.), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 16:1:18.

[0122] [Example 3] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0123] An adhesive composition was prepared by mixing a base agent containing polyester polyol and dibutylhydroxytoluene (BHT) ("Takelac A1143" manufactured by Mitsui Chemicals, Inc.), a curing agent containing an aliphatic isocyanate compound and an aromatic isocyanate compound ("Takenate A3" manufactured by Mitsui Chemicals, Inc.), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 9:1:15.

[0124] [Example 4] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0125] An adhesive composition was prepared by mixing a base agent containing polyester polyol and bisphenol A ("Takelac A1143" manufactured by Mitsui Chemicals, Inc.), a curing agent containing an aliphatic isocyanate compound ("Takenate A50" manufactured by Mitsui Chemicals, Inc.), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 9:1:15.

[0126] [Example 5] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0127] An adhesive composition was prepared by mixing a base agent containing polyester polyol and bisphenol A ("AD-76P1" manufactured by Toyo-Morton Co., Ltd.), a curing agent containing an aromatic isocyanate compound ("CAT-10L" manufactured by Toyo-Morton Co., Ltd.), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 10:1:11.

[0128] [Comparative Example 1] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0129] An adhesive composition was prepared by mixing a base agent containing polyester polyol and epoxy resin ("LX-605" manufactured by DIC Graphics Corporation), a curing agent containing an aromatic isocyanate compound ("KW-40" manufactured by DIC Graphics Corporation), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 10:2:9.

[0130] Comparative Example 2 An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0131] An adhesive composition was prepared by mixing a base agent containing a polyether polyol ("KTEP0535" manufactured by Rock Paint Co., Ltd.), a curing agent containing an aliphatic isocyanate compound ("H039Z2" manufactured by Rock Paint Co., Ltd.), and a solvent (ethyl acetate) in a mass ratio of base agent:curing agent:solvent = 18:3.4:21.

[0132] Comparative Example 3 An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0133] An adhesive composition was prepared by mixing a base agent containing polyester polyol ("TKS-3832" manufactured by Toyo-Morton Co., Ltd.), a curing agent containing an aromatic isocyanate compound ("CAT-10" manufactured by Toyo-Morton Co., Ltd.), and a solvent (toluene) in a mass ratio of base agent:curing agent:solvent = 10:1:7.

[0134] [Comparative Example 4] An exterior material was produced in the same manner as in Example 1, except that the following adhesive composition was used.

[0135] A main agent containing polyester polyol ("LX-627M" manufactured by DIC Graphics Co., Ltd.), a curing agent containing an aromatic isocyanate compound ("KW-40" manufactured by DIC Graphics Co., Ltd.), and a solvent (ethyl acetate) were mixed at a mass ratio of main agent:curing agent: solvent = 4:1:3 to prepare an adhesive composition.

[0136] [Evaluation] [[ID=E12]](1) GC-MS (1-1) Pretreatment Approximately 0.1 mg of the sample was placed in a SUS cup, 1 μL of tetramethylammonium hydroxide (TMAH) was added, and pyrolysis GC-MS measurement was carried out under the following conditions.

[0137] [[ID=E20]]<GC-MS Conditions> · Apparatus used: HP-7890B / 5977B manufactured by Agilnet Technologies · Injection port temperature: 320 °C · Split ratio: 50:1 · Ionization method: EI · Detector: Quadrupole type · MS measurement range (m / z): 33 - 650

[0138] [[ID=E36]]<Pyrolysis Apparatus Conditions> · Apparatus used: S-1020E manufactured by Frontier Lab · Pyrolysis temperature: 600 °C · Derivatization temperature: 450 °C · Derivatization reagent: TMAH · Cryogenic thermal extraction temperature: 300 °C · Extraction time: 10 min

[0139] [[ID=E52]]<Column Conditions> · Column used: UA-5 manufactured by Frontier Lab · Flow rate: 1.7 ml / min · Length × thickness × inner diameter: 30 m × 0.25 μm × 250 μm Heating conditions: 50°C x 5 min (hold), 10°C / min (heating rate), 320°C x 3 min (hold)

[0140] (1-2) Qualitative analysis Qualitative analysis was performed using GC-MS to detect the presence or absence of dibutylhydroxytoluene (BHT), bisphenol A, bisphenol A diglycidyl ether, and aliphatic isocyanates (xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HDI)).

[0141] (2) Accelerated testing Two 100mm x 150mm sheathing materials were used, stacked with the heat-sealable layers facing each other, and the outer edges of the three sides were heat-sealed to obtain a bag with one side open. A 70mm x 100mm glass wool was placed in the bag, and 10g of water was poured into it. The pressure inside the bag was then reduced to approximately 100 Pa, and the opening of the bag was heat-sealed and sealed. This resulted in a partition member.

[0142] The partition members were subjected to an accelerated test in which they were stored at 80°C for 7 days. After the accelerated test, the partition members were checked visually and by touch for any expansion. Cases where there was no expansion were rated "A," and cases where there was expansion were rated "B."

[0143] (3) Pressure Cooker Test (PCT) A partition member was prepared in the same manner as in the above-mentioned accelerated test.

[0144] Using a PCT device (HAST tester PC-R8 manufactured by Hirayama Manufacturing Co., Ltd.), the partition members were subjected to a pressure cooker test for 120 hours in an atmosphere of 120°C, 100% RH, and 0.199 MPa. After the pressure cooker test, the partition members were visually inspected for delamination. Cases without delamination were rated "A," and cases with delamination were rated "B."

[0145] [Table 1]

[0146] It was confirmed that when the adhesive layer contains BHT or bisphenol A, the expansion of the partition member in a high-temperature environment is suppressed. Furthermore, when the adhesive layer contains BHT and bisphenol A diglycidyl ether, the durability of the partition member in a high-temperature, high-humidity environment is shown to be good. Furthermore, when the adhesive layer contains bisphenol A and an aliphatic isocyanate, the durability of the partition member in a high-temperature, high-humidity environment is also shown to be good. [Explanation of symbols]

[0147] 1 … Metal layer 2 … Adhesive layer 3... Heat-sealable layer 10...Exterior materials

Claims

1. An outer covering material for a partition member used for a partition member arranged between a plurality of heat generating elements, The adhesive sheet has a metal layer, an adhesive layer, and a heat-sealable layer in this order, The adhesive layer comprises a cured product of a urethane adhesive composition containing a polyol compound, an isocyanate compound, and a hydrocarbon compound having one or two hydroxyphenyl groups, and the cured product is an exterior material for a partition member.

2. 2. The exterior material for a partition member according to claim 1, wherein the hydrocarbon compound is a monocyclic hindered phenol compound.

3. The exterior material for a partition member according to claim 2 , wherein the monocyclic hindered phenol compound is dibutylhydroxytoluene.

4. 4. The exterior material for partition members according to claim 2 or 3, wherein when the urethane adhesive composition contains the monocyclic hindered phenol compound, no carboxylic acid is detected in the adhesive layer by gas chromatography mass spectrometry.

5. The exterior material for partition members according to any one of claims 2 to 4, wherein the urethane adhesive composition contains an epoxy resin when it contains the monocyclic hindered phenol compound.

6. 6. The exterior material for a partition member according to claim 5, wherein the epoxy resin is bisphenol A diglycidyl ether.

7. 2. The exterior material for a partition member according to claim 1, wherein the hydrocarbon compound is a bisphenol.

8. The exterior material for a partition member according to claim 7, wherein the bisphenol is bisphenol A.

9. 9. The exterior material for a partition member according to claim 7 or 8, wherein when the urethane adhesive composition contains the bisphenol, a carboxylic acid is detected in the adhesive layer by gas chromatography mass spectrometry.

10. The exterior material for a partition member according to any one of claims 7 to 9, wherein the urethane adhesive composition, when it contains the bisphenol, further contains an aliphatic isocyanate compound.

11. The exterior packaging material for a partition member according to claim 1 , wherein the metal layer and the heat-weldable layer are in direct contact with each other via the adhesive layer.

12. The exterior packaging material for a partition member according to claim 1 , further comprising a resin layer between the adhesive layer and the heat-sealable layer.

13. The exterior material for a partition member according to claim 1 , further comprising a protective layer on the surface of the metal layer opposite to the adhesive layer.

14. The exterior packaging material for a partition member according to any one of claims 1 to 13, wherein the heat-sealable layer contains polypropylene.

15. A partition member disposed between a plurality of heating elements, a coolant and an exterior material that encloses the coolant; A partition member, wherein the exterior material is the exterior material for a partition member according to any one of claims 1 to 14.

16. The partition member of claim 15 , wherein the coolant comprises water.

17. A structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements, A structure, wherein the partition member is the partition member according to claim 15 or 16.

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