Fire extinguishment sheet

Abstract

To provide a fire extinguishment sheet that can suppress performance degradation of a fire extinguisher for a sufficiently long period and is easy to express fire extinguishment performance even when there is a certain distance from an origin of fire to the fire extinguishment sheet.SOLUTION: A fire extinguishment sheet according to the present disclosure includes: a sheet-like fire extinguishment material including a fire extinguisher-containing layer; and an aluminum foil encapsulating the fire extinguishment material. The thickness of the aluminum foil is 15 μm or less.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a fire extinguishing sheet. [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 sheet including a fire extinguishing agent-containing layer is placed in a high-temperature and high-humidity environment, the performance of the fire extinguishing agent may be reduced due to the intrusion of moisture. Therefore, as shown in FIG. 6 of Patent Document 2, it is conceivable to suppress the performance reduction of the fire extinguishing agent by sandwiching the fire extinguishing agent-containing layer between a pair of resin substrates for protection. According to the study by the present inventors, the fire extinguishing film having such a configuration still has room for improvement in terms of the effect of suppressing the performance reduction of the fire extinguishing agent due to the intrusion of moisture. On the other hand, according to the fire extinguishing film, when a fire breaks out at a position where the fire directly hits the fire extinguishing film, the fire extinguishing performance can be quickly demonstrated. However, if there is a distance between the source of the fire and the fire extinguishing sheet, the fire extinguishing performance may not be fully demonstrated, and there is room for improvement in this respect.

[0005] The present disclosure has been made in consideration of the above circumstances, and provides a fire extinguishing sheet that can sufficiently suppress deterioration of the performance of a fire extinguishing agent for a long period of time, and that is likely to exhibit fire extinguishing performance even if there is a certain distance between the source of the fire and the fire extinguishing sheet. [Means for solving the problem]

[0006] The fire extinguishing sheet according to one aspect of the present disclosure includes a sheet-shaped fire extinguishing material including an extinguishing agent-containing layer and a packaging material sealing the fire extinguishing material, the packaging material having a laminated structure including aluminum foil, and the thickness of the aluminum foil is 15 μm or less. Since the thickness of the aluminum foil is 15 μm or less, the aluminum foil constituting the main surface of the fire extinguishing sheet is easily torn when the fire extinguishing sheet exerts its fire extinguishing performance. When the main surface of the fire extinguishing sheet is torn, the fire extinguishing agent is ejected from there toward the flame, so that initial extinguishing can be achieved with a high probability compared to a fire extinguishing sheet in which the end surface of the fire extinguishing sheet (for example, the sealing portion of the fire extinguishing sheet) is easily torn. Effect of the Invention

[0007] According to the present disclosure, a fire extinguishing sheet is provided that can sufficiently suppress deterioration of the performance of a fire extinguishing agent for a long period of time and that is likely to exhibit fire extinguishing performance even if there is a certain distance between the source of the fire and the fire extinguishing sheet. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing a schematic view of a fire extinguishing sheet according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the fire extinguishing sheet taken along line II-II of FIG. [Diagram 3] 3(a) and 3(b) are cross-sectional views that typically show the steps of producing the fire extinguishing sheet shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 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.

[0010] <Fire extinguishing sheet> FIG. 1 is a plan view showing a fire extinguishing sheet according to the present embodiment, and FIG. 2 is a schematic cross-sectional view of the fire extinguishing sheet 10 shown in FIG. 1 along line II-II. As shown in FIG. 1, the fire extinguishing sheet 10 has a main surface 10f and a peripheral portion 10a. As shown in FIG. 2, the fire extinguishing sheet 10 has a sheet-shaped fire extinguishing material 3 and a packaging material 8 that contains the fire extinguishing material 3. In this embodiment, the fire extinguishing material 3 is composed of an extinguishing agent-containing layer 1 and a substrate 2. The packaging material 8 is composed of a resin film 4 constituting the outermost layer, an aluminum foil 5, and a sealant layer 6. As shown in FIG. 1, the peripheral portion 10a of the fire extinguishing sheet 10 is composed of a sealing portion formed by the sealant layers 6, 6 of a pair of packaging materials 8, 8. Hereinafter, each configuration of the fire extinguishing sheet 10 will be described.

[0011] (Fire extinguishing agent-containing layer) The extinguishing agent-containing layer 1 is formed by molding a composition (composition for forming a fire extinguishing material) containing a fire extinguishing agent and a binder resin. By using the binder resin, the properties of the fire extinguishing agent are easily maintained, and the frequency of replacing the fire extinguishing sheet can be reduced. The composition for forming a fire extinguishing material may further contain a liquid medium in addition to the above resin and binder resin.

[0012] As the extinguishing agent, various organic salts and inorganic salts can be used alone or in mixture. Examples of the organic salt include potassium salts, sodium salts, and ammonium salts. Examples of the organic salt include potassium salts. Examples of the organic potassium salt include potassium carboxylates such as potassium acetate, potassium citrate (monopotassium citrate, dipotassium citrate, and tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate. Among these, potassium acetate or potassium citrate can be used from the viewpoint of usefulness in the negative catalytic effect of combustion.

[0013] Examples of inorganic salts include potassium salts and sodium salts. Potassium salts can be used as the inorganic salt. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium hydrogen carbonate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, etc. Among these, potassium hydrogen carbonate can be used from the viewpoint of its usefulness in the negative catalytic effect of combustion.

[0014] 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.

[0015] 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.

[0016] The extinguishing agent-containing layer 1 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-containing layer 1 and the type of binder resin.

[0017] The extinguishing agent content of the extinguishing agent-containing layer 1 (based on the total mass of the extinguishing agent-containing layer 1) 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.

[0018] The thickness of the extinguishing agent-containing layer 1 can be appropriately set depending on the amount of extinguishing agent to be blended. The thickness of the extinguishing agent-containing layer 1 can be, for example, 1 mm or less, and may be 30 to 1000 μm, 100 to 500 μm, or 150 to 500 μm.

[0019] 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.

[0020] The amount of the liquid medium may be appropriately adjusted depending on the method of use of the composition for forming a fire extinguishant, but may be 40 to 95 mass% based on the total amount of the composition for forming a fire extinguishant. The composition for forming a fire extinguishant containing the liquid medium may be called a coating liquid for forming a fire extinguishant.

[0021] (base material) Considering that the temperature of a flame is generally about 700°C to 900°C, the substrate 2 is preferably a resin substrate. Examples of materials for the substrate 2 include polyolefins (LLDPE, PP, COP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, polyimides, etc. These resins can be perforated by heat. The substrate 2 may contain a fire extinguishing agent. From the viewpoint of adjusting the water vapor permeability, the substrate 2 may be provided with a vapor deposition layer (alumina vapor deposition layer or silica vapor deposition layer) having water vapor barrier properties.

[0022] The thickness of the substrate 2 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 2 may be 5 μm or more, or may be 10 μm or more. The thickness of the substrate 2 may be 100 μm or less, or may be 30 μm or less.

[0023] (aluminum foil) The thickness of the aluminum foil 5 is 15 μm or less, preferably 13 μm or less, and more preferably 8 μm or less. When the thickness of the aluminum foil 5 is 15 μm or less, when the fire extinguishing sheet 10 exerts its fire extinguishing performance, the main surface 10f of the fire extinguishing sheet 10 is torn, and the extinguishing agent is easily ejected from there toward the flame. The aluminum foil is too thick and the main surface 10f is difficult to tear, and compared with a fire extinguishing sheet in which the peripheral portion is easily torn first, initial fire extinguishing can be realized with a high probability. On the other hand, the thickness of the aluminum foil 5 is preferably 3 μm or more, and more preferably 5 μm or more. When the thickness of the aluminum foil 5 is 3 μm or more, excellent gas barrier properties can be achieved and the excellent gas barrier properties of the aluminum foil 5 can be maintained for a long period of time. According to the study by the present inventors, when the thickness of the aluminum foil 5 is 3 μm or more, deterioration of the gas barrier properties of the aluminum foil 5 can be sufficiently suppressed even if the fire extinguishing agent contains an alkaline component. In contrast, when an aluminum vapor deposition layer having a thickness of about 20 to 100 nm is used instead of aluminum foil, if the fire extinguishing agent contains an alkaline component, the gas barrier properties of the aluminum vapor deposition layer deteriorate in a relatively short period of time.

[0024] The puncture strength of the aluminum foil 5 is preferably 10N or less, more preferably 5N or less. When the puncture strength of the aluminum foil 5 is 10N or less, when the fire extinguishing sheet 10 exerts its fire extinguishing performance, the main surface 10f of the fire extinguishing sheet 10 is broken, and the extinguishing agent is easily ejected from there toward the flame. On the other hand, the puncture strength of the aluminum foil 5 is preferably 0.5N or more, more preferably 1N or more. When the puncture strength of the aluminum foil 5 is 0.5N or more, the occurrence of pinholes can be suppressed, and the excellent gas barrier property of the aluminum foil 5 can be maintained for a long period of time.

[0025] The tensile breaking strength of the aluminum foil 5 is preferably 25N or less, more preferably 20N or less. When the tensile breaking strength of the aluminum foil 5 is 25N or less, when the fire extinguishing sheet 10 exerts its fire extinguishing performance, the main surface 10f of the fire extinguishing sheet 10 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 5 is preferably 8N or more, more preferably 12N or more. When the tensile breaking strength of the aluminum foil 5 is 8N or more, the occurrence of pinholes can be suppressed, and the excellent gas barrier property of the aluminum foil 5 can be maintained for a long period of time.

[0026] Because the extinguishing material 3 is covered with aluminum foil 5 having excellent thermal conductivity, even if there is a certain distance between the source of the fire and the fire extinguishing sheet 10, the entire fire extinguishing sheet 10 is heated in a relatively short time, and the packaging material 8 is broken by the thermal expansion of the extinguishing agent-containing layer 1, making it easy to exhibit fire extinguishing performance. In addition, because the extinguishing material 3 is covered with aluminum foil 5 having excellent gas barrier properties, it is possible to suppress the intrusion of moisture into the fire extinguishing sheet 10, which would otherwise cause a decrease in the performance of the extinguishing agent.

[0027] (Resin film) 2, the resin film 4 constitutes the outermost layer of the fire extinguishing sheet 10. For example, by using a resin film having gas barrier properties as the resin film 4, it is possible to sufficiently prevent moisture from penetrating into the fire extinguishing sheet 10 even if there is a pinhole in the aluminum foil 5. By using a resin film having insulating properties as the resin film 4, it is possible to prevent electrical conduction between adjacent battery cells, for example, even if the fire extinguishing sheet 10 is placed between adjacent battery cells in a battery pack having multiple battery cells.

[0028] (Sealant layer) The sealant layer 6 is for sealing the fire extinguishing material 3. The sealant layer 6 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 6 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.

[0029] 2, the peripheral portion 10a of the fire extinguishing sheet 10 is not covered with the aluminum foil 5, and there may be some portions where the sealant layer 6 is exposed. If the peripheral portion 10a melts or breaks before the aluminum foil 5 breaks, the fire extinguishing material may leak laterally. The sealant layer 6 is preferably made of a resin material having a melting point of 70° C. or higher (more preferably a melting point of 75° C. or higher, and even more preferably a melting point of 95° C. or higher), for example.

[0030] <Fire extinguishing sheet manufacturing method> A method for producing the fire extinguishing sheet 10 will be described. The fire extinguishing sheet 10 can be produced, for example, by a roll-to-roll method as follows. That is, a coating liquid for forming a fire extinguishing agent is applied to the surface of the substrate 2, and then dried to form the fire extinguishing agent-containing layer 1 (see FIG. 3(a)). The coating 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.

[0031] Next, packaging materials 8 (resin film 4 / aluminum foil 5 / sealant layer 6) are arranged on both sides of the fire extinguishing material 3 (laminate of fire extinguishing agent-containing layer 1 and substrate 2) (see FIG. 3(b)). The laminate shown in FIG. 3(b) is pressed while being heated and cut into a die, to obtain a fire extinguishing sheet 10.

[0032] Although the embodiment of the present disclosure has been described in detail above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the outermost layer is made of a resin film 4, but the outermost layer may be made of an aluminum foil 5 depending on the installation location of the fire extinguishing sheet.

[0033] The present disclosure relates to the following: [1] A sheet-shaped fire extinguishing material including a fire extinguishing agent-containing layer; A packaging material enclosing the fire extinguishing material; Equipped with The packaging material has a laminated structure including aluminum foil, The fire extinguishing sheet, wherein the aluminum foil has a thickness of 15 μm or less. [2] The fire extinguishing sheet according to item [1], wherein the aluminum foil has a thickness of 3 μm or more. [3] The fire extinguishing sheet according to item [1] or [2], wherein the puncture strength of the aluminum foil is 10 N or less. [4] The fire extinguishing sheet according to any one of items [1] to [3], wherein the aluminum foil has a tensile breaking strength of 25 N or less. [5] The fire extinguishing sheet according to any one of items [1] to [4], further comprising a resin film constituting an outermost layer of the fire extinguishing sheet. [6] The fire extinguishing sheet according to any one of items [1] to [5], further comprising a sealant layer between the fire extinguishing material and the aluminum foil. [7] The fire extinguishing sheet according to item [6], wherein the peripheral portion is formed by a sealing portion formed by the sealant layer. EXAMPLES

[0034] The present disclosure will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

[0035] <Example 1> (Fire extinguishing material) A fire extinguishing material forming composition was prepared, which was a mixture of the following materials: Extinguishing agent components: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate Binder resin: 41 parts by weight of ether-based polyurethane resin solution (a solution obtained by dissolving 100 parts by weight of ether-based polyurethane resin in 210 parts by weight of isopropyl alcohol) Liquid medium: ethanol 87 parts by weight The mixture of potassium chlorate and tripotassium citrate, a deliquescent salt, was ground in an agate mortar and then filtered through a No. 800 mesh to adjust the particle size D50 to 12 μm before mixing.

[0036] The composition for forming a fire extinguishing material was applied to one side of a 50 μm thick polyethylene terephthalate (PET) base layer (product name: E7002, manufactured by Toyobo Co., Ltd.) using an applicator so that the thickness of the fire extinguishing agent-containing layer after drying would be 150 μm, and then dried for 7 minutes in an oven at 75° C. As a result, a fire extinguishing agent-containing layer was formed on the surface of the base layer, and a sheet-shaped fire extinguishing material was obtained.

[0037] (Fire extinguishing sheet) A laminated film (product name: ALPET, manufactured by Asia Aluminum Co., Ltd.) of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm) was prepared. A sealant layer (LLDPE resin, thickness 30 μm) was laminated onto this laminated film to obtain a packaging material having a laminated structure of PET film / aluminum foil / sealant layer.

[0038] A fire extinguishing sheet was obtained by sandwiching a sheet-shaped fire extinguishing material (50mm x 50mm) between two pieces of the above packaging material and heat sealing the four sides of the packaging material. The heat sealing conditions were 140°C and 2 seconds. The heat seal width of each side was 10mm. As a result, a fire extinguishing sheet with outer dimensions of 70mm x 70mm was obtained.

[0039] <Example 2> A fire extinguishing sheet was obtained in the same manner as in Example 1, except that a laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm) (product name: ALPET, manufactured by Asia Aluminum Co., Ltd.) was used instead of the laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm).

[0040] <Example 3> A fire extinguishing sheet was obtained in the same manner as in Example 1, except that a laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm) (product name: ALPET, manufactured by Asia Aluminum Co., Ltd.) was used instead of the laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm).

[0041] <Comparative Example 1> A fire extinguishing sheet was obtained in the same manner as in Example 1, except that a laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 25 μm) (product name: ALPET, manufactured by Asia Aluminum Co., Ltd.) was used instead of the laminated film of aluminum foil (thickness 7 μm) and PET film (thickness 38 μm).

[0042] <Comparative Example 2> A fire extinguishing sheet was obtained in the same manner as in Example 1, except that a PET film having a silica-deposited layer (thickness: about 20 nm) (hereinafter referred to as "silica-deposited PET film") was used instead of the laminated film of aluminum foil (thickness: 7 μm) and PET film (thickness: 38 μm). The silica-deposited PET film had a thickness of 12 μm and a water vapor permeability of 0.2 to 0.6 g / (m 2 The water vapor permeability in this disclosure refers to a value measured under conditions of 40°C / 90% RH in accordance with JIS K 7129.

[0043] <Comparative Example 3> A fire extinguishing sheet was obtained in the same manner as in Example 1, except that a PET film having an aluminum vapor deposition layer (thickness: about 30 nm) (hereinafter referred to as "aluminum vapor deposition PET film") was used instead of a laminated film of aluminum foil (thickness: 7 μm) and PET film (thickness: 38 μm). The aluminum vapor deposition PET film had a thickness of 12 μm and a water vapor transmission rate of 0.5 to 0.7 g / (m 2 ·day).

[0044] <Evaluation items> (Puncture strength) The aluminum foil (length 100 mm × width 30 mm) used in Examples 1 to 3 and Comparative Example 1 was fixed at a height of 90 mm. A push-pull gauge (manufactured by Aikoh Engineering Co., Ltd.) was used to pierce a jig with a diameter of 15 mm into the aluminum foil, and the strength at which the jig penetrated the aluminum foil was measured.

[0045] (Tensile breaking strength) The aluminum foil (125 mm long × 25 mm wide) used in Examples 1 to 3 and Comparative Example 1 was set in a universal tensile tester (Shimadzu Corporation, Autograph AGS-X). A tensile test was carried out under conditions of a chuck interval of 100 mm and a tensile speed of 200 mm / min, and the strength at which the aluminum foil broke was measured.

[0046] (Deliquescence resistance test) The total light transmittance of the extinguishing materials according to the examples and comparative examples 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 measurements were performed before the extinguishing sheet was placed in a thermo-hygrostat (under conditions of 85°C / 85%RH) (initial total light transmittance) and after 72 hours had elapsed since the sheet was placed in the thermo-hygrostat (total light transmittance after storage), and the change in total light transmittance △ before and after storage was calculated according to the following formula. When moisture absorption (deliquescence) occurs, the transparency of the extinguishing material increases, so the degree of deliquescence was evaluated by checking this change △. The total light transmittance of the extinguishing material obtained by removing the packaging material from the extinguishing sheet was measured. The evaluation was performed based on the following criteria. Change Δ = Total light transmittance value after storage - Initial total light transmittance value A: Change Δ is 35 or less B: Change Δ is greater than 35

[0047] (Fire extinguishing test) An iron container measuring 20 cm in length, 30 cm in width, and 40 cm in height was prepared. A circular vent hole with a diameter of 8.5 mm was provided on each side of the container at a position 5 cm away from the top surface in the height direction. Similarly, circular vent holes with a diameter of 8.5 mm were provided on each side of the container at a position 12.5 cm away from the top surface in the height direction, a position 20.0 cm away from the top surface in the height direction, a position 27.5 cm away from the top surface in the height direction, and a position 35.0 cm away from the top surface in the height direction. A fire extinguishing sheet according to the embodiment and the comparative example was attached to the center of the top surface of the container with double-sided tape. 1.5 g of solid fuel (solid fuel fire block ignition agent manufactured by Captain Stag Co., Ltd.) measuring 15 mm in length, 15 mm in width, and 10 mm in height was placed in the container so that the distance from the fire extinguishing sheet in the height direction was 20 cm. At this time, the fire extinguishing sheet and the solid fuel were overlapped in the height direction. The fire extinguishing sheets were evaluated for their ability to extinguish a solid fuel fire within 180 seconds after it was ignited. The number n in Tables 1 and 2 indicates the number of tests, and the extinguishing rate indicates the rate at which the fire was extinguished within 180 seconds after it was ignited. In all cases where the fire could not be extinguished within 180 seconds after it was ignited, the extinguishing agent did not spray out from the fire extinguishing sheet.

[0048] [Table 1]

[0049] [Table 2] [Explanation of symbols]

[0050] Reference Signs List 1...fire extinguishing agent-containing layer, 2...substrate, 3...fire extinguishing material, 4...resin film, 5...aluminum foil, 6...sealant layer, 8...packaging material, 10...fire extinguishing sheet, 10a...periphery, 10f...main surface.

Claims

1. A sheet-shaped fire extinguishing material including a fire extinguishing agent-containing layer; A packaging material enclosing the fire extinguishing material; Equipped with The packaging material has a laminated structure including aluminum foil, The fire extinguishing sheet, wherein the aluminum foil has a thickness of 15 μm or less.

2. The fire extinguishing sheet according to claim 1, wherein the aluminum foil has a thickness of 3 μm or more.

3. The fire extinguishing sheet according to claim 1 or 2, wherein the aluminum foil has a puncture strength of 10 N or less.

4. The fire extinguishing sheet according to claim 1 or 2, wherein the aluminum foil has a tensile breaking strength of 25 N or less.

5. The fire extinguishing sheet according to claim 1 or 2, further comprising a resin film constituting an outermost layer of the fire extinguishing sheet.

6. The fire extinguishing sheet according to claim 1 or 2, further comprising a sealant layer between the fire extinguishing material and the aluminum foil.

7. The fire extinguishing sheet according to claim 6, wherein a peripheral portion is formed by a sealing portion formed by the sealant layer.

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