Fire extinguishment material and device having fire extinguishment function

Abstract

To provide a fire extinguishment material that can suppress performance degradation of a fire extinguisher, suppresses short circuit with a fire-extinguishing object, and is excellent in a fire-extinguishing performance, and a device including the fire extinguishment material.SOLUTION: A fire extinguishment material according to the present disclosure includes: a sheet including a fire extinguisher layer; and a packaging material storing the sheet. The packaging material has a stacking structure including an aluminum foil, and an insulation layer located in the opposite side of a sheet of the aluminum foil. The extinguisher layer includes a binder resin, and salt of at least one of organic salt and inorganic salt having deliquescence property. A fusion temperature of the insulation layer is 150°C to 500°C.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to fire extinguishing materials and devices having fire extinguishing capabilities. [Background technology]

[0002] Patent Document 1 discloses a fire extinguishing body in which a fire extinguishing composition that generates an aerosol by combustion is mixed with a binder and the mixture is formed into a sheet. Patent Document 2 discloses a fire extinguishing film that can be easily installed in a location where there is a risk of ignition and has an excellent effect in initial fire extinguishing at the time of ignition. FIG. 6 of Patent Document 2 illustrates a fire extinguishing film 40 that includes a fire extinguishing agent-containing layer 1 and surface layers 6a and 6b arranged to sandwich the fire extinguishing agent-containing layer 1, and paragraph

[0040] of the same document discloses that, for example, a resin substrate can be used as the surface layers 6a and 6b. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 047762 [Patent Document 2] Patent Publication No. 2021-137345 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a fire-extinguishing material including a fire-extinguishing agent layer is placed in a high-temperature and high-humidity environment, the performance of the fire-extinguishing agent may be deteriorated due to the intrusion of moisture. Therefore, as shown in FIG. 6 of Patent Document 2, it is conceivable to suppress the deterioration of the performance of the fire-extinguishing agent by sandwiching the fire-extinguishing agent layer between a pair of resin substrates for protection. According to the study by the present inventors, there is still room for improvement in the effect of suppressing the deterioration of the performance of the fire-extinguishing agent due to the intrusion of moisture in a fire-extinguishing film having such a configuration.

[0005] The present inventors have considered packaging a sheet including a fire extinguishing agent layer in a packaging material including aluminum foil in order to suppress deterioration of the performance of the fire extinguishing agent. As a result of the consideration, it became clear that when the object to be extinguished that may catch fire is an electrical device, etc., placing a fire extinguishing material around the object to be extinguished may cause a short circuit in the electrical circuit, resulting in equipment failure or fire.

[0006] The present disclosure has been made in consideration of the above circumstances, and provides a fire extinguishing material that can suppress deterioration of the performance of the fire extinguishing agent, suppresses short circuits with an object to be extinguished, and has excellent fire extinguishing performance. The present disclosure also provides a device having a fire extinguishing function and that is equipped with such a fire extinguishing material. [Means for solving the problem]

[0007] [1] A sheet including a fire extinguishing agent layer; A packaging material containing the sheet; Equipped with The packaging material has a laminated structure including an aluminum foil and an insulating layer located on the opposite side to the aluminum foil sheet, the extinguishing agent layer includes a binder resin and a fire extinguishing agent including at least one salt selected from an organic salt and an inorganic salt having deliquescent properties, A fire extinguishing material in which the melting temperature of the insulating layer is 150℃ to 500℃. [2] The volume resistivity of the insulating layer is 10 15 The fire extinguishing material according to [1], having a resistance to fire of Ω·cm or more. [3] The fire extinguishing material according to [1] or [2], wherein the thermal conductivity of the insulating layer is 0.1 W / (m·K) or more. [4] The fire extinguishing material according to any one of [1] to [3], wherein the insulating layer contains at least one of polyethylene terephthalate, nylon, polyvinyl chloride, and polypropylene. [5] The fire extinguishing material according to any one of [1] to [4], wherein the sheet further comprises a substrate. [6] The fire extinguishing material according to any one of [1] to [5], wherein the aluminum foil has a thickness of 3 μm or more and 15 μm or less. [7] At least one object to be extinguished that may catch fire selected from the group consisting of electrical equipment, switchboards, distribution boards, and batteries; [1] to [6], and a fire extinguishing material according to any one of the above. An apparatus having a fire extinguishing function. Effect of the Invention

[0008] According to the present disclosure, a fire extinguishing material that can suppress deterioration of the performance of the fire extinguishing agent and suppress short circuit with the object to be extinguished and has excellent fire extinguishing performance is provided. Also, according to the present disclosure, a device having a fire extinguishing function and including such a fire extinguishing material is provided. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view showing a schematic diagram of a fire-extinguishing material according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the fire-extinguishing material shown in FIG. 1 taken along line II-II. [Diagram 3] FIG. 3 is a schematic cross-sectional view of a fire-extinguishing material according to another embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view of a fire-extinguishing material according to another embodiment. [Diagram 5] FIG. 5 is a schematic cross-sectional view of a fire-extinguishing material according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as needed. However, the present invention is not limited to the following embodiments.

[0011] <Fire extinguishing material> FIG. 1 is a plan view showing a fire extinguishing material according to the present embodiment, and FIG. 2 is a schematic cross-sectional view of the fire extinguishing material 100 shown in FIG. 1 along line II-II. As shown in FIG. 1, the fire extinguishing material 100 includes a main surface 100f and a peripheral portion 100a. As shown in FIG. 2, the fire extinguishing material 100 includes a sheet 10 and a packaging material 20 that houses the sheet 10. The sheet 10 has a laminated structure including a base material 11 and a fire extinguishing agent layer 12. The packaging material 20 has a laminated structure including a sealant layer 21a, an adhesive layer 22a, an aluminum foil 23, an adhesive layer 22b, and an insulating layer 24 in this order. The melting temperature of the insulating layer 24 is 150 to 500° C. As shown in FIG. 2, the peripheral portion 100a of the fire extinguishing material 100 is formed by a sealing portion formed by the sealant layers 21a of a pair of packaging materials 20.

[0012] The extinguishing material 100 can suppress the performance degradation of the extinguishing agent contained in the extinguishing agent layer 12, and also suppresses short-circuiting with the object to be extinguished, and has excellent extinguishing performance. The inventors of the present invention speculate as follows about the reason why such an effect is achieved. That is, in the extinguishing material 100, the sheet 10 is contained in the packaging material 20 including the aluminum foil 23. This suppresses deliquescence of the extinguishing material due to moisture derived from the external environment, and suppresses the performance degradation of the extinguishing material 100. In addition, generally, when the packaging material includes aluminum foil, a short circuit may occur between the extinguishing material and the object to be extinguished. In the extinguishing material 100, the packaging material 20 includes an insulating layer 24, and the melting temperature of the insulating layer 24 is 150 to 500°C. Since the melting temperature of the insulating layer 24 is 150°C or higher, even if the object to be extinguished experiences thermal runaway to a degree that does not lead to ignition, the insulating layer can be prevented from melting and causing a short circuit. In addition, since the melting temperature of the insulating layer 24 is 500°C or less, the insulating layer 24 is less likely to hinder the ejection of the aerosol-like fire extinguishing agent in the event of a fire. As a result, the fire extinguishing material 100 can suppress the performance degradation of the fire extinguishing agent and also suppresses short circuits with the object to be extinguished, and has excellent fire extinguishing performance. Each component of the fire extinguishing material 100 will be described below.

[0013] (base material) The sheet 10 includes a base material 11. This further improves the stability of the extinguishing agent, and also tends to improve the rigidity of the extinguishing material 100. In consideration of the fact that the temperature of a flame is generally about 700°C to 900°C, the base material 11 is preferably a resin base material. Examples of materials for the base material 11 include polyolefin (LLDPE, PP, COP, CPP, etc.), polyester (PET, etc.), fluororesin (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resin, epoxy resin, polyamide, polyimide, etc. These resins can be perforated by heat. The base material 11 may include a fire extinguishing agent. From the viewpoint of adjusting the water vapor permeability, the base material 11 may be provided with a vapor deposition layer (alumina vapor deposition layer or silica vapor deposition layer) having water vapor barrier properties.

[0014] The thickness of the substrate 11 can be appropriately selected depending on the amount of heat at the time of fire outbreak, impact, allowable space, etc. The thickness of the substrate 11 may be 5 μm or more, or may be 10 μm or more. The thickness of the substrate 11 may be 100 μm or less, or may be 30 μm or less.

[0015] (Fire extinguishing agent layer) The extinguishing agent layer 12 is formed by molding a composition (composition for forming an extinguishing agent layer) containing an extinguishing agent and a binder resin. By using the binder resin, the properties of the extinguishing agent are easily maintained, and the frequency of replacing the extinguishing material can be reduced. The composition for forming an extinguishing agent layer may further contain a liquid medium in addition to the above resin and binder resin.

[0016] The extinguishing agent contains at least one of an organic salt and an inorganic salt having deliquescent properties. The organic salt and the inorganic salt may be used alone or in combination of two or more kinds.

[0017] Examples of the organic salt include potassium salts, sodium salts, and ammonium salts. Potassium salts can be used as the organic salt. Examples of the organic potassium salt include potassium carboxylates such as potassium acetate, potassium citrate (monopotassium citrate, dipotassium citrate, tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate.

[0018] Examples of the inorganic salt include potassium salts and sodium salts. Potassium salts can be used as the inorganic salt. Examples of the inorganic potassium salt include potassium carbonate, potassium hydrogen carbonate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate.

[0019] As the organic salt and inorganic salt, tripotassium citrate is preferable. Although tripotassium citrate has high extinguishing performance, its performance may decrease due to its high deliquescent nature. However, the extinguishing material 100 includes aluminum foil 23. Therefore, by using tripotassium citrate, the extinguishing material 100 tends to have better extinguishing performance while suppressing the performance decrease of the extinguishing agent.

[0020] The extinguishing agent may contain an oxidizing compound, such as a chlorate salt, such as potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, or magnesium chlorate, which can generate an aerosol from each potassium salt upon receiving heat energy from a fire.

[0021] Thermoplastic resins and thermosetting resins can be used as the binder resin. Examples of the thermoplastic resin include polyolefin resins such as polypropylene resins, polyethylene resins, poly(1-)butene resins, and polypentene resins, polystyrene resins, acrylonitrile-butadiene-styrene resins, methyl methacrylate-butadiene-styrene resins, ethylene-vinyl acetate resins, ethylene-propylene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins, polyvinyl chloride resins, polyvinyl alcohol (PVA), and polyvinyl butyral (PVB). Examples of thermosetting resins include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polyvulcanized rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U), polyurethane resin, phenolic resin, epoxy resin, polyvinyl ether (PMVE)-maleic anhydride resin, etc. The binder resin may contain a curing agent component.

[0022] The extinguishing agent layer 12 may contain a colorant, an antioxidant, a flame retardant, an inorganic filler, etc., and from the viewpoint of property stability, may contain additives such as a surfactant, a silane coupling agent, an antiblocking agent, etc. These components can be appropriately selected depending on the composition of the extinguishing agent layer 12 and the type of binder resin.

[0023] The extinguishing agent content of the extinguishing agent layer 12 (based on the total mass of the extinguishing agent layer 12) can be 70 to 97 mass%, may be 80 to 95 mass%, or may be 85 to 92 mass%. When the extinguishing agent content is 70 mass% or more, excellent fire extinguishing performance is easily achieved, while when it is 97 mass% or less, excellent moldability is easily achieved.

[0024] The thickness of the extinguishing agent layer 12 can be appropriately set depending on the amount of extinguishing agent to be blended. The thickness of the extinguishing agent layer 12 can be, for example, 1 mm or less, and may be 30 to 1000 μm, 100 to 500 μm, or 150 to 500 μm.

[0025] The liquid medium may be an organic solvent. The organic solvent may be a water-soluble solvent, for example, alcohols such as methanol, ethanol, isopropyl alcohol, n-propyl alcohol, etc.; ketones such as acetone, methyl ethyl ketone, etc.; glycols such as ethylene glycol, diethylene glycol, etc.; glycol ethers such as N-methylpyrrolidone (NMP), tetrahydrofuran, butyl cellosolve, etc. From the viewpoint that the extinguishing agent has deliquescent properties, the liquid medium may be an alcohol-based solvent, specifically, isopropyl alcohol.

[0026] The amount of the liquid medium may be appropriately adjusted depending on the method of use of the composition for forming a fire extinguishing layer, but may be 40 to 95 mass% based on the total amount of the composition for forming a fire extinguishing layer. The composition for forming a fire extinguishing layer containing the liquid medium can be called a coating liquid for forming a fire extinguishing layer.

[0027] (Sealant layer) The sealant layer 21a is for sealing the sheet 10. The sealant layer 21a is made of, for example, a resin material having heat melting properties (heat fusion properties). Examples of the resin material having heat melting properties include polyolefin resins. That is, the sealant layer 21a may contain a polyolefin resin. Examples of the polyolefin resin include polyolefin resins such as low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), medium-density polyethylene resin (MDPE), and non-oriented polypropylene resin (CPP), polyethylene resins such as ethylene-vinyl acetate copolymer and ethylene-α-olefin copolymer, and polypropylene resins such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer. Among these, the polyolefin resin may contain low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), or non-oriented polypropylene resin (CPP), from the viewpoint of excellent heat sealability and low water vapor permeability, which makes it easy to suppress deterioration of the fire extinguishing agent.

[0028] The sealant layer 21a is preferably made of a resin material having a melting point of, for example, 70° C. or higher (more preferably, 75° C. or higher, and even more preferably, 95° C. or higher).

[0029] (adhesive layer) Examples of adhesives constituting the adhesive layers 22a and 22b include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or synthetic adhesives thereof, etc. Among these, from the viewpoint of achieving both good adhesion and low cost, a synthetic urethane adhesive is preferably used as the adhesive.

[0030] The thickness of the adhesive layers 22a and 22b may be, for example, 1 to 100 μm (1 to 30 μm or 30 to 100 μm depending on the material used).

[0031] (aluminum foil) The thickness of the aluminum foil 23 is preferably 15 μm or less, more preferably 13 μm or less, and even more preferably 8 μm or less. When the thickness of the aluminum foil 23 is 15 μm or less, when the fire extinguishing material 100 exerts its fire extinguishing performance, the main surface 100f of the fire extinguishing material 100 is broken, and the extinguishing agent is easily ejected from there toward the flame. Compared with a fire extinguishing material in which the main surface 100f is difficult to break because the aluminum foil is too thick and the peripheral portion is easily broken first, initial extinguishing can be realized with a high probability. On the other hand, the thickness of the aluminum foil 23 is preferably 3 μm or more, and even more preferably 5 μm or more. When the thickness of the aluminum foil 23 is 3 μm or more, excellent gas barrier properties can be achieved and the deterioration of the performance of the fire extinguishing agent tends to be further suppressed.

[0032] The piercing strength of the aluminum foil 23 is preferably 10N or less, more preferably 5N or less. When the piercing strength of the aluminum foil 23 is 10N or less, when the fire extinguishing material 100 exerts its fire extinguishing performance, the main surface 100f of the fire extinguishing material 100 is broken, and the extinguishing agent is easily ejected from there toward the flame. On the other hand, the piercing strength of the aluminum foil 23 is preferably 0.5N or more, more preferably 1N or more. When the piercing strength of the aluminum foil 23 is 0.5N or more, the occurrence of pinholes can be suppressed, and there is a tendency that the deterioration of the performance of the fire extinguishing agent can be further suppressed.

[0033] The tensile breaking strength of the aluminum foil 23 is preferably 25N or less, more preferably 20N or less. When the tensile breaking strength of the aluminum foil 23 is 25N or less, when the fire extinguishing material 100 exerts its fire extinguishing performance, the main surface 100f of the fire extinguishing material 100 is broken, and the extinguishing agent is easily ejected from the broken surface toward the flame. On the other hand, the tensile breaking strength of the aluminum foil 23 is preferably 8N or more, more preferably 12N or more. When the tensile breaking strength of the aluminum foil 23 is 8N or more, the occurrence of pinholes can be suppressed, and the deterioration of the performance of the fire extinguishing agent tends to be further suppressed.

[0034] Since the sheet 10 is covered with the aluminum foil 23 having excellent thermal conductivity, even if there is a certain distance between the source of the fire and the extinguishing material 100, the entire extinguishing material 100 is heated in a relatively short time, and the packaging material 20 is broken by the thermal expansion of the extinguishing agent layer 12, making it easy to exhibit the fire extinguishing performance. In addition, since the sheet 10 is covered with the aluminum foil 23 having excellent gas barrier properties, it is possible to suppress the intrusion of moisture into the inside of the extinguishing material 100, which would otherwise cause a decrease in the performance of the extinguishing agent.

[0035] (insulating layer) As shown in Fig. 2, the insulating layer 24 constitutes the outermost layer of the fire extinguishing material 100. The insulating layer 24 may be made of a resin. Examples of the resin include polypropylene (PP), polyester (polyethylene terephthalate (PET) and the like), nylon, fluororesin (ethylene tetrafluoroethylene (ETFE) and the like), and polyvinyl chloride (PVC). The material of the insulating layer 24 is preferably polypropylene, polyester, nylon, or polyvinyl chloride. When the insulating layer 24 is made of these materials, the fire extinguishing material 100 tends to have even more excellent fire extinguishing performance.

[0036] The resin content in the insulating layer 24 may be 80 mass % or more, 90 mass % or more, or 95 mass % or more, based on the total amount of the insulating layer 24, or may be 100 mass %.

[0037] The thickness of the insulating layer 24 is preferably 4 μm or more from the viewpoint of abrasion resistance and mechanical strength retention. The thickness of the insulating layer 24 is preferably 50 μm or less because it has excellent flexibility and allows the fire extinguishing material to be installed in a narrow space.

[0038] The melting temperature of the insulating layer 24 is 150°C or higher, and preferably 220°C or higher. When the melting temperature is within the above range, there is a tendency for short circuits with the object to be extinguished to be further suppressed. The melting temperature of the insulating layer 24 is 500°C or lower, and preferably 400°C or lower. When the melting temperature is within the above range, the fire extinguishing material 100 tends to have even better fire extinguishing performance. The melting temperature is measured by analysis of endothermic peaks by differential scanning calorimetry.

[0039] The volume resistivity of the insulating layer 24 is 10 15 It is preferable that the resistance is 10 Ω·cm or more. 19 It is more preferable that the volume resistivity is Ω·cm or more. When the volume resistivity is in this range, there is a tendency that short circuits between the fire extinguishing material and the object to be extinguished can be further suppressed. The volume resistivity is measured in accordance with JIS C2139-3.

[0040] The thermal conductivity of the insulating layer 24 is preferably 0.1 W / (m·K) or more, and more preferably 0.3 W / (m·K) or more. When the thermal conductivity is in this range, heat is easily transferred to the fire-extinguishing agent layer. Therefore, the fire-extinguishing material 100 tends to have even better fire-extinguishing performance. The thermal conductivity is measured in accordance with ASTM C177.

[0041] Although the fire extinguishing material according to one embodiment has been described in detail above, the fire extinguishing material of the present disclosure is not limited to the above embodiment. For example, in the above embodiment, the end of the aluminum foil 23 is exposed from the end face of the fire extinguishing material 100, but the end of the aluminum foil 23 may be covered with the insulating layer 24. FIG. 3 is a schematic cross-sectional view of a fire extinguishing material according to another embodiment. In the fire extinguishing material 100 according to this embodiment, the sealant layer 21a, the adhesive layer 22, and the aluminum foil 23 are sealed with the insulating layer 24.

[0042] The fire extinguishing material may further include a sealant layer between the aluminum foil 23 and the insulating layer 24. Fig. 4 is a schematic cross-sectional view of a fire extinguishing material according to another embodiment. The fire extinguishing material 100 according to this embodiment includes a sealant layer 21b between the aluminum foil 23 and the insulating layer 24.

[0043] Also, the fire extinguishing material 100 may not have the sealant layer 21a and the adhesive layers 22a and 22b (see FIG. 5). In this case, the insulating layer 24 is formed by applying a composition containing an insulating resin onto the aluminum foil 23 to form a coating film, and then drying the coating film. Furthermore, the fire extinguishing material 100 can be housed inside by welding the ends of the aluminum foil 23.

[0044] <Fire extinguishing material manufacturing method> A method for producing the fire extinguishing material 100 will be described. The fire extinguishing material 100 can be produced, for example, by a roll-to-roll method as follows. That is, a coating liquid for forming a fire extinguishing agent layer is applied to the surface of the substrate 11, and then dried to form the fire extinguishing agent layer 12. The application can be performed by a wet coating method. Examples of the wet coating method include gravure coating, comma coating, spray coating, dip coating, curtain coating, spin coating, sponge roll method, die coating, and painting with a brush.

[0045] Next, a pair of packaging materials 20 are placed on both sides of the sheet 10. The packaging materials 20 are heat pressed and cut out to obtain the fire extinguishing material 100.

[0046] <Devices with fire extinguishing functions> An apparatus according to one embodiment will be described. The apparatus according to this embodiment includes an object to be extinguished that may catch fire, and the fire extinguishing material according to the above embodiment.

[0047] Examples of the object to be extinguished include electrical equipment, a distribution board, a switchboard, and a battery (e.g., a lithium-ion battery). In the device according to the present embodiment, the extinguishing material may be disposed so as to face the object to be extinguished. The distance between the extinguishing material and the object to be extinguished may be, for example, 0 mm or more or 1 mm or more, and may be 5 mm or less or 10 mm or less. EXAMPLES

[0048] The present disclosure will be described in more detail with reference to the following examples, but the present disclosure is not limited to these examples.

[0049] <Preparation of sheets> (Examples 1 to 5, Comparative Examples 1 to 9) Potassium citrate and potassium chlorate were mixed and ground in an agate mortar to obtain a mixture. The mixture was sieved through a mesh of 800 to adjust the particle size D50 to 8-12 μm. This resulted in the fire extinguishing agent.

[0050] The following components were mixed to prepare a liquid composition for forming a fire extinguishing agent layer. Extinguishing agent: Mixture of potassium citrate and potassium chlorate obtained above (87.4 parts by mass) Binder resin: Ether-based urethane resin (12.6 parts by mass) Liquid medium: ethanol (87 parts by weight) and isopropyl alcohol (27 parts by weight)

[0051] A polyethylene terephthalate (PET) film (product name: E7002, manufactured by Toyobo Co., Ltd., thickness 50 μm) was prepared as a substrate. A composition for forming a fire extinguishing agent layer was applied to one main surface of the PET film using an applicator (gap 450 μm) to obtain a coating film. The coating film was dried in an oven (conditions: 75° C., 7 minutes). As a result, a sheet in which a fire extinguishing agent layer (thickness: 190 to 210 μm) was formed on the substrate (PET film) was obtained.

[0052] <Production of packaging materials> (Examples 1 to 5, Comparative Examples 1 to 4, 7, and 9) As the adhesive to form the adhesive layer, urethane adhesives A-1143 and A-3 manufactured by Mitsui Chemicals, Inc., and ethyl acetate were prepared as a dilution solvent. These were mixed in a ratio of A-1143:A-3:ethyl acetate = 9:1:20.7 and stirred for 1 minute. This resulted in an adhesive (solid content: 20% by mass).

[0053] The material (resin film) shown in Table 1 was prepared as the insulating layer. An adhesive was applied to one surface of the insulating layer by a bar coating method using a wire bar #14 to obtain a coating film. The coating film was dried in an oven at 80°C for 30 seconds. This resulted in a first adhesive layer (dry coating amount 3 g / m 2) was obtained. An aluminum foil (1N30 aluminum foil, 7 μm thick, manufactured by Toyo Aluminum) was laminated on the surface of the first adhesive layer opposite to the insulating layer. The lamination was performed using a tabletop laminator FA-570 manufactured by Taisei Laminator Co., Ltd. under conditions of a lamination temperature of 50° C. and a pressure of 0.1 MPa.

[0054] In the same manner as the first adhesive layer, a second adhesive layer was obtained on the surface of the aluminum foil opposite to the first adhesive layer. A sealant layer (linear low-density polyethylene resin, thickness 30 μm) was laminated on the surface of the second adhesive layer opposite to the aluminum foil. The lamination was performed using a tabletop laminator FA-570 manufactured by Taisei Laminator Co., Ltd. under conditions of a lamination temperature of 50° C. and a pressure of 0.1 MPa. This resulted in a packaging material having an insulating layer, a first adhesive layer, an aluminum foil, a second adhesive layer, and a sealant layer in this order.

[0055] Comparative Example 5 A packaging material was obtained in the same manner as in Example 1, except that the non-flammable paper shown in Table 1 was used instead of the resin film.

[0056] Comparative Example 6 A packaging material was obtained in the same manner as in Example 1, except that a glass cloth shown in Table 1 was used instead of the resin film.

[0057] [Table 1]

[0058] <Fire extinguishing material manufacturing> (Examples 1 to 5, Comparative Examples 1 to 9) The sheet obtained above was sandwiched between a pair of packaging materials, and the four sides of the packaging materials were heat-sealed to enclose the sheet. The heat-sealing conditions were 140°C and 2 seconds. In this way, an evaluation sample of the fire extinguishing material was obtained.

[0059] <Fire extinguishing test evaluation> An iron container measuring 20 cm in length, 30 cm in width, and 40 cm in height was prepared. Five circular vents with a diameter of 8.5 mm were provided on each side of the container at heights of 5, 12.5, 20.0, 27.5, and 35.0 cm from the top surface to prevent the ignited solid fuel from suffocating. An evaluation sample with an area of ​​50 mm x 50 mm was attached to the center of the top surface of the container with double-sided tape. 1.5 g of solid fuel (Captain Stag Co., Ltd. solid fuel fire block ignition agent) measuring 15 mm in length, 15 mm in width, and 10 mm in height was placed in the center of the bottom surface of the container. The distance between the solid fuel and the evaluation sample was set to 20 cm. When the solid fuel was ignited, it was confirmed whether the evaluation sample could be extinguished within 180 seconds after the solid fuel was ignited. It was confirmed whether the fire could be extinguished for five samples in each of the examples and comparative examples. The percentage of the five samples that were extinguished is shown in Table 2.

[0060] <Insulation evaluation> The evaluation sample was cut to a size of 50 mm x 50 mm. A voltage of 3.5 kV was applied to both sides of the evaluation sample (temperature: 25°C) for 60 seconds. The results were evaluated based on the following criteria. An AC / DC withstand voltage and insulation resistance tester (manufactured by Kikusui Electric Industry Co., Ltd.) was used to apply the voltage. In addition, a voltage was similarly applied to the evaluation sample heated to 150°C. The results were evaluated based on the following criteria. The results are shown in Table 2. (standard) A: No electricity B: Powered on

[0061] <Fire extinguishing material property stability> The total light transmittance of the obtained evaluation sample was measured using a haze meter (BYK-Gardner Haze-Guard Plus manufactured by BYK) according to a method conforming to JIS K 7361-1. The measurement was performed before (initial total light transmittance) and after 24 hours had elapsed since being placed in a thermo-hygrostat (under conditions of 85°C / 85%RH). These total light transmittances were substituted into the following formula (1) to calculate the change amount Δ in the total light transmittance before and after storage. When moisture absorption (deliquescence) occurs in the extinguishing agent, the transparency of the extinguishing agent layer increases. Therefore, the degree of deliquescence can be confirmed by checking the change amount Δ. The change amount Δ was evaluated based on the following criteria. The results are shown in Table 2. Change Δ = total light transmittance value after storage - initial total light transmittance value (1)

[0062] (standard) A: Change Δ is 35 or less B: Change Δ is greater than 35

[0063] <Measurement of volume resistivity of insulating layer> A film of the insulating layer alone was prepared, and the volume resistivity of the insulating layer was measured in accordance with JIS C2139-3-1. The results are shown in Table 2.

[0064] <Measurement of thermal conductivity of insulating layer> A film of the insulating layer alone was prepared, and the thermal conductivity of the insulating layer was measured in accordance with ASTM C177. The results are shown in Table 2.

[0065] <Measurement of the melting temperature of the insulating layer> A film of the insulating layer alone was prepared, and the differential scanning calorimetry was measured using a differential scanning calorimeter DSC7000X (Hitachi High-Tech Science Co., Ltd.). From the results, the melting temperature was calculated from the endothermic peak. The results are shown in Table 2.

[0066] [Table 2] [Explanation of symbols]

[0067] 10...sheet, 11...substrate, 12...fire extinguishing agent layer, 20...packaging material, 23...aluminum foil, 24...insulating layer, 100...fire extinguishing material.

Claims

1. A sheet including a fire extinguishing agent layer; A packaging material containing the sheet; Equipped with The packaging material has a laminated structure including an aluminum foil and an insulating layer located on the opposite side of the aluminum foil to the sheet, the extinguishing agent layer includes a binder resin and a fire extinguishing agent including at least one salt selected from an organic salt and an inorganic salt having deliquescent properties, The melting temperature of the insulating layer is 150°C to 500°C.

2. The volume resistivity of the insulating layer is 10 １５ The fire extinguishing material according to claim 1, having a resistance of Ω·cm or more.

3. The fire extinguishing material according to claim 1, wherein the insulating layer has a thermal conductivity of 0.1 W / (m·K) or more.

4. 2. The fire extinguishing material according to claim 1, wherein the insulating layer contains at least one of polyethylene terephthalate, nylon, polyvinyl chloride, and polypropylene.

5. The fire extinguishing material of claim 1 , wherein the sheet further comprises a substrate.

6. The fire extinguishing material according to claim 1, wherein the aluminum foil has a thickness of 3 μm or more and 15 μm or less.

7. At least one object to be extinguished that may catch fire is selected from the group consisting of electrical equipment, a distribution board, a switchboard, and a battery; The fire extinguishing material according to any one of claims 1 to 6, An apparatus having a fire extinguishing function.

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