Fire-extinguishing agent composition, fire-extinguishing agent sheet, method for producing fire-extinguishing agent sheet, and secondary battery package

Abstract

A fire-extinguishing agent composition comprising: component (A) which is a binder; component (B) which is an inorganic oxidizing agent; component (C) which is an organic acid alkali metal salt; and component (D) which is an inorganic acid alkali metal salt.

Description

Fire extinguishing composition, fire extinguishing sheet, method for producing fire extinguishing sheet, and secondary battery package

[0001] The present invention relates to a fire extinguishant composition, a fire extinguishant sheet, a method for producing a fire extinguishant sheet, and a secondary battery package.

[0002] 2. Description of the Related Art In recent years, secondary batteries such as lithium secondary batteries have been widely used not only in small devices such as portable electronic devices but also in medium- to large-sized devices such as automobiles and power storage devices.

[0003] Although secondary batteries have advantages such as high operating voltage and excellent energy density, they also pose a major safety issue due to the risk of internal short circuits and fires caused by overheating. To improve safety, a technology has been proposed that places a fire extinguishing agent around the secondary battery.

[0004] For example, Patent Document 1 discloses an electrochemical energy storage device having a housing and at least one electrochemical cell provided in the housing, in which at least one wall of the housing is coated with a fire extinguishing agent or a fire extinguishing agent additive, or is supplied with a fire extinguishing agent or a fire extinguishing agent additive, at least in a region thereof.

[0005] However, with the technology of Patent Document 1, there is a risk that a secondary battery that has caught fire may not be easily extinguished. In addition, for example, if a high-temperature secondary battery catches fire, the temperature may rise further and spread to the surrounding area, causing a chain reaction of fires that makes it difficult to extinguish the fire.

[0006] Patent Document 2 also discloses a fire extinguishing sheet containing a fire extinguishing agent that thermally decomposes upon reaching a predetermined temperature to generate a fire extinguishing component in the form of an aerosol. Patent Document 2 also describes that the sheet can be used by being placed in contact with or adjacent to a lithium ion battery.

[0007] Furthermore, Patent Document 3 discloses a method for producing a fire-extinguishing film, which includes a step of obtaining a kneaded product of a fire-extinguishing composition by kneading a thermoplastic resin with a slurry or powder containing a fire-extinguishing agent component that generates an aerosol upon combustion, and a step of molding the kneaded product.

[0008] Patent Document 4 discloses a flame-resistant fiber sheet comprising a flame-resistant fiber sheet substrate and a fire-extinguishing agent component that generates an aerosol (radicals) by thermal energy generated by combustion. Patent Document 4 also discloses a secondary battery cell or a secondary battery cell unit in which individual battery cells and / or assemblies of multiple battery cells are covered with a flame-resistant fiber sheet.

[0009] However, even with these technologies, it cannot be said that sufficient fire extinguishing performance is achieved.

[0010] Japanese Patent Publication No. 2013-541131 Japanese Patent Publication No. 2021-118847 Japanese Patent Publication No. 2021-137345 Japanese Patent Publication No. 2023-130115

[0011] In view of the above circumstances, an object of the present disclosure is to provide a fire extinguishing composition having sufficient fire extinguishing performance.

[0012] A fire extinguisher composition according to one embodiment of the present disclosure contains component (A) a binder, component (B) an inorganic oxidizing agent, component (C) an organic acid alkali metal salt, and component (D) an inorganic acid alkali metal salt.

[0013] According to the present disclosure, a fire extinguishing composition having sufficient fire extinguishing performance can be provided.

[0014] Fig. 1 is an explanatory diagram of a fire extinguisher sheet according to one embodiment of the present disclosure. Fig. 2 is a flow diagram of a method for manufacturing a fire extinguisher sheet according to one embodiment of the present disclosure. Fig. 3 is an explanatory diagram of a secondary battery according to one embodiment of the present disclosure.

[0015]

[0033] Hereinafter, one embodiment of the present disclosure (hereinafter referred to as "the present embodiment") will be described in detail. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. [Fire Extinguisher Composition] (1) First Embodiment The fire extinguisher composition of this embodiment is a fire extinguisher composition containing component (A) a binder, component (B) an inorganic oxidizing agent, component (C) an organic acid alkali metal salt, and component (D) an inorganic acid alkali metal salt.

[0016] The fire extinguishing films and flame-resistant fiber sheets disclosed in Patent Documents 3 and 4 may not exhibit sufficient fire extinguishing properties due to their spontaneous combustion properties. That is, in order to improve fire extinguishing performance, there may be a need to suppress spontaneous combustion. In this specification, "suppressing spontaneous combustion" means that the fire extinguishing composition or the fire extinguishing sheet will not ignite when a fire is brought close to it, and means that the composition passes a cerium-iron spark test, which is an ignition test.

[0017] The fire extinguisher composition of the present embodiment can achieve sufficient fire extinguishing performance and suppression of spontaneous combustion, which makes it possible to apply the fire extinguisher composition of the present embodiment to secondary batteries in particular.

[0018] In the following description, the term "component" may be omitted from component (A), component (B), component (C), and component (D), and they may simply be referred to as (A), (B), (C), and (D). Also, they may be referred to as component (A), and the type of compound of component (A) may be omitted.

[0019] The fire extinguisher composition of the present embodiment relates to a fire extinguisher composition that uses an aerosol-like fire-extinguishing component to enable efficient fire extinguishing, and more specifically, to a fire extinguisher composition that uses metal radicals and is particularly effective in the early stage of extinguishing a heat-generating fire caused by a secondary battery or the like.

[0020] (1-1) Contained Components The components contained in the fire extinguisher composition of this embodiment will be described below. (1-1-1) Component (D) Inorganic Acid Alkali Metal Salt Component (D) inorganic acid alkali metal salt is not particularly limited, and may be, for example, one or more inorganic acid alkali metal salts selected from alkali metal sulfates, alkali metal phosphates, alkali metal thiocyanates, alkali metal metasilicates, alkali metal thiosulfates, etc. However, those classified as component (B) inorganic oxidizers are excluded. When the fire extinguisher composition of this embodiment contains component (D) inorganic acid alkali metal salt, spontaneous combustion can be suppressed.

[0021] Of the above inorganic acid alkali metal salts, the inorganic acid alkali metal salt of component (D) is particularly preferably an alkali metal sulfate or an alkali metal phosphate. That is, component (D) may be one or more selected from phosphates and sulfates, or may be a phosphate or a sulfate. When component (D) contains one or more selected from phosphates and sulfates, the spontaneous combustion of the fire extinguisher composition of this embodiment can be particularly suppressed. Examples of alkali metals include lithium (Li), potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), and francium (Fr). Of these, lithium, potassium, and sodium are preferred, potassium and sodium are more preferred, and potassium is particularly preferred.

[0022] That is, (D) as an inorganic acid alkali metal salt, potassium phosphate (K ３ P.O. ４ ), or potassium sulfate (K ２ SO ４ )

[0023] The content of component (D) in the fire extinguisher composition of this embodiment is not particularly limited, and may be selected depending on the material used for component (D), the required fire extinguishing performance, and the like.

[0024] For example, when potassium phosphate is used as component (D), the content of component (D) may be more than 5.0 parts by mass and less than 15.0 parts by mass relative to 100 parts by mass of the total amount of components (A), (B), and (C).

[0025] Furthermore, when potassium sulfate is used as component (D), the content of component (D) may be 3.0 parts by mass or more and less than 40.0 parts by mass relative to 100 parts by mass of the total amount of components (A), (B), and (C).

[0026] The content of component (D) may be more than 5.0 parts by mass and less than 15.0 parts by mass relative to 100 parts by mass of the total amount of components (A), (B), and (C).

[0027] By setting the content of component (D) in the fire extinguishant composition of this embodiment within the above range, the fire extinguishing performance of the fire extinguishant composition can be particularly improved regardless of the material of component (D).

[0028] The upper limit of the content of component (D) relative to 100 parts by mass of the total of components (A), (B), and (C) is more preferably 14.5 parts by mass, 14.0 parts by mass, 13.5 parts by mass, 13.0 parts by mass, or 12.5 parts by mass, and particularly preferably 12.0 parts by mass. The lower limit is more preferably 5.5 parts by mass, 6.0 parts by mass, 6.5 parts by mass, 7.0 parts by mass, or 7.5 parts by mass, and particularly preferably 8.0 parts by mass. The content of component (D) relative to 100 parts by mass of the total of components (A), (B), and (C) means the content ratio of component (D) relative to 100 parts by mass of the total of components (A), (B), and (C) contained in the fire extinguisher composition, where the total of the contents of components (A), (B), and (C) contained in the fire extinguisher composition is 100 parts by mass.

[0029] Therefore, the amount of component (D) may be 5.5% to 14.5 parts by mass, 6.0% to 14.0 parts by mass, 6.5% to 13.5 parts by mass, 7.0% to 13.0 parts by mass, or 7.5% to 12.5 parts by mass, relative to 100 parts by mass of the total amount of components (A), (B), and (C). The amount of component (D) relative to 100 parts by mass of the total amount of components (A), (B), and (C) is most preferably 8.0 parts by mass to 12.0 parts by mass.

[0030] The fire extinguisher composition of this embodiment may contain only one type of compound as component (D) inorganic acid alkali metal salt, or may contain compounds with two or more different types of alkali metals or different types of inorganic acids. (1-1-2) Component (A) Binder The component (A) binder is not particularly limited as long as it disperses and fixes particles approximately uniformly, and may be, for example, one or more types selected from thermoplastic resins, thermosetting resins, rubbers, celluloses, thickening polysaccharides, etc. Examples of materials that can be used for component (A) binder are described below.(1-1-2-1) Examples of Materials for Component (A) Binder <Thermoplastic Resin> Thermoplastic resins that can be used as component (A) include high-density polyethylene resins, low-density polyethylene resins, linear low-density polyethylene resins, very low-density polyethylene resins, polypropylene resins, polybutadiene resins, cyclic olefin resins, polymethylpentene resins, polystyrene resins, ethylene-vinyl acetate copolymers, ionomer resins, ethylene-vinyl alcohol copolymer resins, ethylene-ethyl acrylate copolymers, acrylonitrile-styrene resins, acrylonitrile-chlorinated polystyrene-styrene copolymer resins, acrylonitrile-acrylic rubber-styrene copolymer resins, acrylonitrile-butadiene-styrene copolymer resins, acrylonitrile-EPDM-styrene copolymer resins, silicone rubber-acrylonitrile-styrene copolymer resins, cellulose acetate-butyrate resins, cellulose acetate resins, methacrylic resins, ethylene-methyl methacrylate copolymer resins, ethylene-ethyl acrylate resins, vinyl chloride resins, chlorinated polyethylene resins, polyethylene tetrafluoride resins, tetrafluoroethylene-hexafluoropropylene copolymer resins, cellulose acetate-butylate resins, cellulose acetate resins, methacrylic resins, ethylene-methyl methacrylate copolymer resins, ethylene-ethyl acrylate resins, vinyl chloride resins, chlorinated polyethylene resins, polyethylene tetrafluoride resins, ethylene hexafluoride copolymer resins, cellulose acetate-butylate resins, cellulose acetate resins, methacrylic resins, polyethylene methyl methacrylate copolymer resins, ethylene ethyl acrylate resins, vinyl chloride resins, chlorinated polyethylene resins, polyethylene tetrafluoride resins, ethylene hexafluoride copolymer resins, cellulose acetate-butylate resins, cellulose acetate ... Examples of the resin include, but are not limited to, polyethylene copolymer resins, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resins, tetrafluoroethylene-ethylene copolymer resins, polytrifluorochloroethylene resins, polyvinylidene fluoride resins, nylon 4,6, nylon 6, nylon 6,6, nylon 6,10, nylon 6,12, nylon 12, nylon 6,T, nylon 9,T, aromatic nylon resins, polyacetal resins, ultra-high molecular weight polyethylene resins, polybutylene terephthalate resins, polyethylene terephthalate resins, polyethylene naphthalate resins, amorphous copolyester resins, polycarbonate resins, modified polyphenylene ether resins, thermoplastic polyurethane elastomers, polyphenylene sulfide resins, polyether ether ketone resins, liquid crystal polymers, polytetrafluoroethylene resins, polyfluoroalkoxy resins, polyetherimide resins, polysulfone resins, polyketone resins, thermoplastic polyimide resins, polyamideimide resins, polyarylate resins, polysulfone resins, polyethersulfone resins, biodegradable resins, and biomass resins.Furthermore, when a thermoplastic resin is used as the component (A) binder, the thermoplastic resin may be a single type selected from these thermoplastic resins, or a mixture of two or more types. The same applies to the following thermosetting resins, rubbers, celluloses, and thickening polysaccharides.

[0031] <Thermosetting Resin> Examples of thermosetting resins that can be used as component (A) include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 1,4-butanediol mono(meth)acrylate, carbitol (meth)acrylate, acryloylmorpholine, half esters that are reaction products of hydroxyl group-containing (meth)acrylates with acid anhydrides of polycarboxylic acid compounds, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane polyethoxy tri(meth)acrylate, glycerin polypropoxy tri(meth)acrylate, and neopentyl hydroxypivalate. Examples of such a resin include photocurable resins such as di(meth)acrylates of ε-caprolactone adducts of pentyl glycol (e.g., KAYARAD (registered trademark) HX-220, HX-620, etc., manufactured by Nippon Kayaku Co., Ltd.), pentaerythritol tetra(meth)acrylate, poly(meth)acrylates which are reaction products of dipentaerythritol and ε-caprolactone, dipentaerythritol poly(meth)acrylates (e.g., KAYARAD (registered trademark) DPHA, etc., manufactured by Nippon Kayaku Co., Ltd.), and (meth)acrylate compounds such as epoxy (meth)acrylates which are reaction products of mono- or polyglycidyl compounds and (meth)acrylic acid; and thermosetting resins having a cyclic ether such as an epoxy group or an oxetanyl group. Note that (meth)acrylate is a general term for acrylate and methacrylate.

[0032] <Rubbers> Examples of rubbers that can be used as component (A) include diene rubbers such as polybutadiene, polyisoprene, styrene-butadiene random copolymers, styrene-butadiene block copolymers, hydrogenated products of these block copolymers, acrylonitrile-butadiene copolymers, and butadiene-isoprene copolymers; ethylene-propylene random copolymers, ethylene-propylene block copolymers, ethylene-butene random copolymers, ethylene-butene block copolymers; copolymers of ethylene and α-olefins; ethylene-unsaturated carboxylic acid copolymers such as ethylene-acrylic acid and ethylene-methacrylic acid; ethylene-unsaturated carboxylic acid copolymers such as ethylene-acrylic acid esters and ethylene-methacrylic acid esters; acrylic ester copolymers, ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid metal salt copolymers such as ethylene-acrylic acid-metal acrylic acid and ethylene-methacrylic acid-metal methacrylic acid, in which a portion of the unsaturated carboxylic acid is a metal salt; acrylic ester-butadiene copolymers, for example, butyl acrylate-butadiene copolymers, and other acrylic elastic polymers; copolymers of ethylene and fatty acid vinyl such as ethylene-vinyl acetate; ethylene-propylene-ethylidenenorbornene copolymers, ethylene-propylene-hexadiene copolymers, and other ethylene-propylene non-conjugated diene copolymers; butylene-isoprene copolymers; chlorinated polyethylene; polyamide elastomers; and polyester elastomers.

[0033] <Celluloses> Examples of celluloses that can be used as component (A) include cellulose derivatives synthesized by modifying some of the hydroxy groups of β-glucose molecules linearly linked by glycosidic bonds to make them water-soluble. That is, component (A) may be one or more cellulose derivatives. The cellulose derivative may be a compound in which some of the hydroxy groups have been modified with one or more groups selected from methoxy groups, carboxymethoxy groups, and hydroxy(C2-C3)alkoxy groups. The hydroxy(C2-C3)alkoxy groups refer to hydroxyethoxy groups and hydroxypropoxy groups. A cellulose derivative substituted (modified) with a carboxymethoxy group is called carboxymethylcellulose (CMC). Similarly, a cellulose derivative substituted with a methoxy group is called methylcellulose. A cellulose derivative substituted with a hydroxyethoxy group is called hydroxyethylcellulose. A cellulose derivative substituted with a hydroxypropoxy group is called hydroxypropylcellulose.

[0034] The hydroxy groups in cellulose may be substituted with multiple types of substituents. For example, hydroxyethyl methylcellulose, in which the hydroxy groups in cellulose are substituted with methoxy groups and hydroxyethoxy groups at a certain ratio, is available on the market as Metolose (registered trademark) SE-SEB, SNB (manufactured by Shin-Etsu Chemical Co., Ltd.). Furthermore, hydroxypropyl methylcellulose, in which the hydroxy groups in cellulose are substituted with methoxy groups and hydroxypropoxy groups at a certain ratio, is available on the market as Metolose (registered trademark) SH-60SH, 65SH, 90SH (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0035] These may be used alone or in combination.

[0036] When a cellulose is used as the component (A) binder, the cellulose derivative may be cellulose in which hydroxy groups in the cellulose are substituted with, for example, methoxy groups and / or hydroxy(C2-C3)alkoxy groups. That is, component (A) may contain cellulose substituted with methoxy groups and / or hydroxy(C2-C3)alkoxy groups, or may be cellulose substituted with methoxy groups and / or hydroxy(C2-C3)alkoxy groups.

[0037] Cellulose in which hydroxy groups in the cellulose are substituted with methoxy groups and / or hydroxy(C2-C3)alkoxy groups contributes to reducing the hygroscopicity of the fire extinguisher composition, thereby particularly improving its storage stability. In this specification, the term "A and / or B" means "both A and B, or either A or B." <Thickening Polysaccharides> Component (A) may contain a thickening polysaccharide. Component (A) may also be a thickening polysaccharide. When component (A) of the fire extinguisher composition contains a thickening polysaccharide, the hardness of a kneaded product of the fire extinguisher composition and a molded product of the kneaded product can be increased. Furthermore, increasing the hardness of a kneaded product of the fire extinguisher composition and a molded product of the fire extinguisher composition can facilitate the production of molded products of the fire extinguisher composition, such as fire extinguisher sheets, by extrusion molding. Furthermore, the impact resistance and heat resistance of fire extinguisher sheets and the like can be improved. The thickening polysaccharide is not particularly limited, and examples thereof include commonly known natural simple polysaccharides, natural complex polysaccharides, synthetic simple polysaccharides, and synthetic complex polysaccharides. For details of these polysaccharides, see "Encyclopedia of Biochemistry (2nd Edition), Tokyo Kagaku Dojin Shuppan" and "Food Industry," Vol. 31 (1988), p. 21, etc.

[0038] Here, the thickening polysaccharide is a saccharide polymer having many hydrogen-bonding groups within the molecule, and is a polysaccharide characterized by a large difference in viscosity between low and high temperatures due to the difference in intermolecular hydrogen bonding strength depending on the temperature. Furthermore, when inorganic oxide particles are added to the thickening polysaccharide, the viscosity increases at low temperatures, presumably due to hydrogen bonding with the inorganic oxide particles. The viscosity increase is a polysaccharide that, upon addition, increases the viscosity at 15°C by 1.0 mPa·s or more, preferably 5.0 mPa·s or more, and more preferably 10.0 mPa·s or more.

[0039] The thickening polysaccharide applicable to the fire extinguisher composition of this embodiment is not particularly limited. Examples of thickening polysaccharides include galactans (e.g., agarose, agaropectin, etc.), galactomannoglycans (e.g., locust bean gum, guaran, tara gum, guar gum, etc.), xyloglucans (e.g., tamarind gum, etc.), glucomannan (e.g., konjac mannan, wood-derived glucomannan, xanthan gum, etc.), galactoglucomannan (e.g., coniferous wood-derived glycans), arabinogalactoglycans (e.g., soybean-derived glycans, microbial-derived glycans, etc.), glucoramnoglycans (e.g., gellan gum, etc.), glycosaminoglycans (e.g., hyaluronic acid, keratan sulfate, etc.), alginic acid, alginates, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, and natural polymeric polysaccharides derived from red algae such as furcellaran. That is, component (A) may contain one or more thickening polysaccharides selected from the group consisting of galactan, galactomannoglycan, xyloglucan, glucomannoglycan, galactoglucomannoglycan, arabinogalactoglycan, glucoramnoglycan, glycosaminoglycan, alginic acid, alginate, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, and furcellaran. Alternatively, component (A) may be one or more thickening polysaccharides selected from the above group of thickening polysaccharides.

[0040] Among these, particularly preferred thickening polysaccharides include polysaccharides composed of pentoses such as L-arabitose, D-ribose, 2-deoxyribose, and D-xylose, and hexoses such as D-glucose, D-fructose, D-mannose, and D-galactose, and heteropolysaccharides containing two or more of these are also preferred. Specifically, preferred examples include guar gum, cationized guar gum, hydroxypropyl guar gum, locust bean gum, and tara gum, which are known as galactomannans, a type of galactomannoglycan, and have a main chain of mannose and a side chain of glucose, as well as arabinogalactan, which has a main chain of galactose and a side chain of arabinose. In this embodiment, guar gum, cationized guar gum, and hydroxypropyl guar gum are particularly preferred.

[0041] Among the above-mentioned binders, component (A) of the fire extinguisher composition of this embodiment can be selected depending on the properties required of the fire extinguisher composition and is not particularly limited. However, for example, cellulose derivatives, which are celluloses, are particularly preferred. Therefore, component (A) binder may be one or more cellulose derivatives. Among cellulose derivatives, hydroxypropyl methylcellulose, in which hydroxy groups in cellulose are substituted with methoxy groups and hydroxypropoxy groups at a certain ratio, is particularly preferred. By using hydroxypropyl methylcellulose as component (A) binder, the effect of improving shape retention can be obtained. Here, high shape retention means that the fire extinguisher composition is prevented from losing its shape when molded into a fire extinguisher sheet or the like, and has excellent shape stability.

[0042] (1-1-2-2) Blending Proportion of Component (A) Binder In the fire extinguishant composition of this embodiment, the content of component (A) may be 0.5 mass% or more and 18.5 mass% or less based on the total amount of components (A), (B), and (C). As described in Patent Document 3, for example, the content of the binder component needs to be a certain amount or more from the viewpoint of moldability. However, if the content is too high, there is a concern that the fire extinguishing performance may be affected.

[0043] According to the investigations of the inventors of the present invention, when the above-mentioned component (A) is used in the fire extinguishant composition of the present embodiment, by setting the content ratio of component (A) in the total amount of component (A), component (B), and component (C) within the above range, it is possible to achieve both moldability and fire extinguishing performance.

[0044] It is preferable to find the content thereof by trial and error as appropriate depending on the material used as the binder. As described above, in the fire extinguisher composition of the first embodiment, a cellulose derivative can be particularly preferably used as the component (A) binder. When a cellulose derivative is used as the component (A) binder, by setting the content ratio of component (A) in the total amount of components (A), (B), and (C) within the above range, it is possible to achieve both moldability and fire extinguishing performance and particularly improve them.

[0045] More preferred amounts (content ratios) of component (A) are, in order of preference, 18.0 mass%, 16.0 mass%, 14.0 mass%, 12.0 mass%, 10.0 mass%, 9.0 mass%, 8.0 mass%, 7.0 mass%, and 6.0 mass%, with 5.0 mass% being particularly preferred, and lower limits are, in order of preference, 0.8 mass%, 1.0 mass%, 1.2 mass%, 1.5 mass%, and 1.8 mass%, with 2.0 mass% being particularly preferred. Therefore, the content of component (A) in the total amount of components (A), (B), and (C) may be 0.8% by mass or more and 18.0% by mass or less, 1.0% by mass or more and 16.0% by mass or less, 1.2% by mass or more and 14.0% by mass or less, 1.5% by mass or more and 12.0% by mass or less, 1.8% by mass or more and 10.0% by mass or less, 1.8% by mass or more and 9.0% by mass or less, 1.8% by mass or more and 8.0% by mass or less, 1.8% by mass or more and 7.0% by mass or less, or 1.8% by mass or more and 6.0% by mass or less. The most preferable content of component (A) in the total amount of components (A), (B), and (C) is 2.0% by mass or more and 5.0% by mass or less. (1-1-3) Component (B) Inorganic Oxidizing Agent Component (B) inorganic oxidizing agent can promote the generation of radicals from (C) organic acid alkali metal salt by the thermal energy of combustion.The inorganic oxidizing agent (B) is not particularly limited as long as it is an inorganic compound, but examples thereof include nitrates (potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate, iron nitrate, etc.), nitrites (sodium nitrite, potassium nitrite, etc.), chlorates (potassium chlorate, sodium chlorate, etc.), perchlorates (potassium perchlorate, sodium perchlorate, etc.), chlorites (potassium chlorite, sodium chlorite, etc.), hypochlorites (potassium hypochlorite, sodium hypochlorite, etc.), bromates (potassium bromate, sodium bromate, etc.), perbromates (potassium perbromate, sodium perbromate, etc.), bromites (potassium bromite, sodium bromite, etc.), hypobromites (potassium hypobromite, sodium hypobromite, etc.), borates (potassium borate, sodium borate, etc.), ferrates, ferrites, manganates, permanganates, etc. These may be used alone or in combination.

[0046] Chlorate, perchlorate, chlorite, hypochlorite, bromate, perbromate, bromite, and hypobromite may be collectively referred to as halogen acid salts. Therefore, component (B) may be at least one inorganic oxidizing agent selected from halogen acid salts, nitrates, nitrites, borates, ferrates, ferrites, manganates, permanganates, and the like.

[0047] Component (B) may be at least one inorganic oxidizing agent selected from, for example, nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates, bromites, borates, ferrates, ferrites, manganates, and permanganates. Component (B) may also be at least one inorganic oxidizing agent selected from, for example, nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates, and bromites.

[0048] Of these, component (B) preferably used in the fire extinguisher composition of this embodiment may be at least one inorganic oxidizing agent selected from halogen salts, such as chlorate, perchlorate, chlorite, bromate, perbromate, and bromite. Component (B) may more preferably be at least one inorganic oxidizing agent selected from chlorate, perchlorate, and chlorite. Component (B) may further preferably be at least one inorganic oxidizing agent selected from potassium chlorate and potassium perchlorate, and particularly preferably potassium chlorate. (1-1-4) Component (C) Organic Acid Alkali Metal Salt The (C) organic acid alkali metal salt can supply alkali metal radicals during combustion of components (A) and (B). As the (C) organic acid alkali metal salt, for example, one or more selected from alkali metal acetate, alkali metal propionate, alkali metal citrate, alkali metal ethylenediaminetetraacetate, alkali metal phthalate, and alkali metal oxalate can be used, with alkali metal citrate being preferred.

[0049] The alkali metal in the organic acid alkali metal salt may be one or more selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Furthermore, potassium and sodium are preferred as alkali metals, with potassium being particularly preferred. Therefore, the organic acid alkali metal salt may be an organic acid potassium salt. By using an organic acid potassium salt as component (C) organic acid alkali metal salt, the fire extinguishing performance of the fire extinguisher composition can be effectively improved due to the fire extinguishing performance provided by potassium radicals. (1-1-5) Component (E) Polyvinylpyrrolidone The fire extinguisher composition of this embodiment may further contain (E) polyvinylpyrrolidone. Component (E) functions as a binder, similar to component (A), but also contributes to improved storage stability.

[0050] When component (E) is used, its content is preferably 0.1% by mass or more and 10.0% by mass or less relative to the total amount of components (A), (B), (C), and (D). The upper limits are more preferably 5.0% by mass, 4.0% by mass, and 3.0% by mass, respectively, and particularly preferably 2.0% by mass. The lower limits are more preferably 0.3% by mass, 0.5% by mass, and 0.8% by mass, respectively, and particularly preferably 1.0% by mass. Therefore, the content of component (E) relative to the total amount of components (A), (B), (C), and (D) may be 0.3% by mass or more and 5.0% by mass or less, 0.5% by mass or more and 4.0% by mass or less, or 0.8% by mass or more and 3.0% by mass or less. The most preferred content of component (D) relative to the total amount of components (A) to (D) is 1.0% by mass or more and 2.0% by mass or less. (1-1-6) Other Components The fire extinguisher composition of the present embodiment may contain other components such as a catalyst, a colorant, an antioxidant, a flame retardant, an inorganic filler, a fuel, etc., as long as the effects of the fire extinguisher composition are not impaired. <Catalyst> The catalyst that may be contained in the fire extinguisher composition of the present embodiment is not particularly limited, but examples include catalysts that promote combustion to make the generation of alkali metal radicals more efficient and more effectively suppress the combustion of hydrogen that has leaked into the air.

[0051] Examples of catalysts include lithium oxide, beryllium oxide, sodium oxide, magnesium oxide, aluminum oxide, silicon oxide, potassium oxide, calcium oxide, scandium (III) oxide, titanium (IV) oxide, vanadium (V) oxide, chromium (III) oxide, chromium (IV) oxide, manganese (IV) oxide, nickel (II) oxide, nickel (III) oxide, copper (I) oxide, copper (II), zinc oxide, gallium (III), molybdenum (VI), zirconium oxide, hafnium (IV), cerium (IV), copper, rubidium, rhodium, palladium, silver, iridium, platinum, and gold. One or more catalysts selected from the above-listed candidates can be used.

[0052] <Colorant> A colorant may be added to the fire extinguisher composition of the present embodiment, mainly for the purpose of design. Examples of colorants that can be used include direct dyes, basic dyes, acid dyes, reactive dyes, solvent dyes, disperse dyes, leather dyes, natural dyes, sulfur dyes, vat dyes, synthetic pigments, and natural pigments. As the colorant, one or more types selected from the above-listed candidates can be used.

[0053] <Antioxidant> Examples of antioxidants that may be contained in the fire extinguisher composition of the present embodiment include butylated hydroxytoluene, butylated hydroxyanisole, tertiary butylhydroquinone, gallates, 2-phenyl-2-propanol, 1-(2,4,5-trihydroxyphenyl)-1-butanone, bisphenolmethane derivatives, 2,2-methylenebis(4-methyl-6-t-butylphenol), etc. As the antioxidant, one or more types selected from the above-listed candidates can be used.

[0054] <Inorganic Filler> Examples of inorganic fillers that may be contained in the fire extinguisher composition of this embodiment include fused silica, crystalline silica, silicon carbide, silicon nitride, boron nitride, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, mica, talc, clay, alumina, magnesium oxide, zirconium oxide, aluminum hydroxide, magnesium hydroxide, calcium silicate, aluminum silicate, lithium aluminum silicate, zirconium silicate, barium titanate, glass fiber, carbon fiber, molybdenum disulfide, asbestos, etc., and preferably fused silica, crystalline silica, silicon nitride, boron nitride, calcium carbonate, barium sulfate, calcium sulfate, mica, talc, clay, alumina, aluminum hydroxide, calcium silicate, aluminum silicate, etc., and more preferably fused silica, crystalline silica, alumina, talc, etc. As the inorganic filler, one or more types selected from the above-listed candidates can be used.

[0055] <Fuel> The fire extinguisher composition of this embodiment may contain a fuel for the purpose of more efficiently generating thermal energy through combustion. Examples of the fuel that can be used include dicyandiamide, nitroguanidine, guanidine nitrate, urea, melamine, melamine cyanurate, Avicel, sodium carboxymethylcellulose, potassium carboxymethylcellulose, ammonium carboxymethylcellulose, nitrocellulose, aluminum, boron, magnesium, magnalium, zirconium, titanium, titanium hydride, tungsten, and silicon. As the fuel, one or more types selected from the above-listed candidates can be used. (2) Second Embodiment The fire extinguisher composition of this embodiment is a fire extinguisher composition containing component (A) a binder, component (B) an inorganic oxidizer, and component (C) an organic acid alkali metal salt. The hardness after molding is 0.4 kgf / cm ２ 1.60kgf / cm or more ２ The following can be mentioned. For example, as disclosed in Patent Document 2 and Patent Document 3, conventional fire extinguishing sheets and fire extinguishing films have thicknesses ranging from several μm to several hundred μm, making it difficult to ensure a sufficient amount of fire extinguishing agent for the object to be extinguished. While stacking multiple layers is considered to solve this problem, this is a cumbersome process, and it is difficult to improve fire extinguishing properties by stacking layers. Furthermore, Patent Document 4 discloses the manufacture of a flame-resistant fiber sheet several mm thick, but this is a flame-resistant fiber sheet impregnated with an aerosol, which does not ensure a sufficient amount of fire extinguishing agent per unit area, and the manufacturing method is also cumbersome.

[0056] One way to solve these problems is to mold the fire extinguishing agent sheet to a certain thickness or more, but there is not enough knowledge about the hardness required to mold it to a certain thickness or the hardness required to prevent it from breaking when hit by a fall, etc., so manufacturing it has not been easy.

[0057] Therefore, the fire extinguisher composition of this embodiment is a fire extinguisher composition that can achieve a hardness within a predetermined range after molding, thereby providing a fire extinguisher composition that has sufficient fire extinguishing performance and excellent impact resistance when formed into a fire extinguisher sheet. (2-1) Regarding the Components Component (A), Component (B), and Component (C) can be the same materials as those described in the first embodiment, and therefore their description will be omitted. A thickening polysaccharide may be used as component (A). The use of a thickening polysaccharide as component (A) can increase the hardness after molding, thereby improving moldability and the impact resistance of the molded fire extinguisher sheet. Furthermore, heat resistance can be improved.

[0058] In the fire extinguisher composition of this embodiment, the content of component (A) may be 0.5% by mass or more and 18.5% by mass or less of the total amount of components (A), (B), and (C). The content of the binder component needs to be a certain amount or more from the viewpoint of moldability, as described in Patent Document 3, for example. However, if the content is too high, there is a concern that the fire extinguishing performance may be affected.

[0059] According to the investigations of the inventors of the present invention, when the above-mentioned component (A) is used in the fire extinguishant composition of the present embodiment, by setting the content ratio of component (A) in the total amount of component (A), component (B), and component (C) within the above range, it is possible to achieve both moldability and fire extinguishing performance.

[0060] It is preferable to find the content thereof by trial and error, depending on the material used as the binder. In the fire extinguisher composition of the second embodiment, a thickening polysaccharide can be particularly preferably used as the component (A) binder. When a thickening polysaccharide is used as the component (A) binder, by setting the content of component (A) in the total amount of components (A), (B), and (C) within the above range, it is possible to achieve both moldability and fire extinguishing performance.

[0061] Further, more preferred amounts (content ratios) of component (A) are 18.0 mass%, 17.5 mass%, 17.0 mass%, 16.5 mass%, 16.0 mass%, and 15.5 mass%, respectively, with 15.0 mass% being particularly preferred. The lower limits are 1.0 mass%, 5.0 mass%, 7.0 mass%, 8.0 mass%, and 9.0 mass%, respectively, with 10.0 mass% being particularly preferred. Therefore, the content ratio of component (A) in the total amount of components (A), (B), and (C) may be 1.0 mass% or more and 18.0 mass% or less, 5.0 mass% or more and 17.5 mass% or less, 7.0 mass% or more and 17.0 mass% or less, 8.0 mass% or more and 16.5 mass% or less, 9.0 mass% or more and 16.0 mass% or less, or 9.0 mass% or more and 15.5 mass% or less. The most preferable content ratio of component (A) in the total amount of components (A), (B), and (C) is 10.0 mass % or more and 15.0 mass % or less.

[0062] The fire extinguisher composition of this embodiment may contain other components such as component (D) inorganic acid alkali metal salt, component (E) polyvinylpyrrolidone, catalyst, colorant, antioxidant, flame retardant, inorganic filler, fuel, etc., as long as the effects of the fire extinguisher composition are not impaired. The same materials as those described in the first embodiment may be used for the other components such as component (D) inorganic acid alkali metal salt and (E) polyvinylpyrrolidone, and therefore further description will be omitted. (2-2) Regarding Hardness The fire extinguisher composition of this embodiment has a hardness of 0.4 kgf / cm after molding. ２ 1.60kgf / cm or more ２ It can be as follows:

[0063] By setting the hardness of the fire extinguishant composition of this embodiment within the above range after molding, it is believed that the composition has the advantage of excellent moldability, and can be molded to a thickness of at least a certain level. Furthermore, by setting the thickness to at least a certain level, breakage and the like are less likely to occur when the composition is made into a fire extinguishant sheet. In other words, the impact resistance of the fire extinguishant sheet can be improved.

[0064] The more preferable lower limit of the hardness of the extinguishant composition of this embodiment after molding is 0.50 kgf / cm２ , 0.70kgf / cm ２ , 0.80kgf / cm ２ and particularly preferably 1.00 kgf / cm ２ The more preferable upper limit is 1.55 kgf / cm ２ , 1.50kgf / cm ２ , 1.45kgf / cm ２ and particularly preferably 1.30 kgf / cm ２ Therefore, the hardness of the fire extinguisher composition of this embodiment after molding is 0.50 kgf / cm ２ 1.55kgf / cm or more ２ or less, 0.70 kgf / cm ２ 1.50 kgf / cm or more ２ or less, 0.80 kgf / cm ２ 1.45kgf / cm or more ２ It may be 1.00 kgf / cm or less. Particularly preferably, it may be 1.00 kgf / cm ２ More than 1.30kgf / cm ２ The following is the result.

[0065] [Thickness of Fire Extinguishant Sheet] The thickness of the fire extinguishant sheet obtained by molding the fire extinguishant composition of the present embodiment is preferably 1.1 mm or more and 20.0 mm or less.

[0066] The upper limit of the thickness is preferably 19.0 mm, 18.0 mm, 17.0 mm, 16.0 mm, and particularly preferably 15.0 mm, and the lower limit is preferably 1.5 mm, 1.8 mm, and 2.0 mm, and particularly preferably 2.5 mm.

[0067] Therefore, the thickness of the fire extinguishant sheet formed from the fire extinguishant composition of this embodiment may be 1.5 mm or more and 19.0 mm or less, 1.8 mm or more and 18.0 mm or less, 1.8 mm or more and 17.0 mm or less, or 2.0 mm or more and 16.0 mm or less, and most preferably 2.5 mm or more and 15.0 mm or less.

[0068] By setting the thickness of the fire extinguishing agent sheet within the above range, the fire extinguishing performance per unit area can be particularly improved, the drying of the solvent during production can be promoted, and the occurrence of cracks and the like can be prevented.

[0069] The thickness of the fire extinguishing agent sheet can be obtained by molding a square fire extinguishing agent sheet, measuring the thickness at the four corners and the center using a Nikon DIGIMICROSTAND (MS-11C), and calculating the average value.

[0070] 1 , the thickness is measured at measurement points A, B, C, and D at the four corners and at measurement point E at the center on the first surface 10A perpendicular to the thickness, and the arithmetic mean value thereof can be used as the thickness T10 of the fire extinguishant sheet 10. [Method for producing fire extinguishant composition] The fire extinguishant composition according to the first embodiment of the present disclosure can be produced by thoroughly mixing and kneading component (A), component (B), component (C), component (D), and optionally component (E) and other components at room temperature.

[0071] The fire extinguisher composition according to the second embodiment of the present disclosure can be produced by thoroughly mixing and kneading the component (A), the component (B), the component (C), and the component (D), the component (E), and other components used as needed at room temperature.

[0072] In any embodiment of the fire extinguisher composition, an organic solvent may be added to improve kneadability.

[0073] Sufficient mixing can be confirmed by visually checking for the presence or absence of aggregates, etc. [Fire extinguishant sheet, method for manufacturing fire extinguishant sheet] (1) First embodiment and second embodiment The fire extinguishant composition according to the first embodiment of the present disclosure can be processed into a sheet form and used as the fire extinguishant sheet according to the first embodiment. That is, the fire extinguishant sheet according to the first embodiment is obtained by molding the fire extinguishant composition according to the first embodiment of the present disclosure. The fire extinguishant sheet according to the first embodiment is a molded product of the fire extinguishant composition according to the first embodiment of the present disclosure.

[0074] The fire extinguishant composition according to the second embodiment of the present disclosure can be processed into a sheet form and used as the fire extinguishant sheet according to the second embodiment. That is, the fire extinguishant sheet according to the second embodiment is obtained by molding the fire extinguishant composition according to the second embodiment of the present disclosure. The fire extinguishant sheet according to the second embodiment is a molded product of the fire extinguishant composition according to the second embodiment of the present disclosure.

[0075] The method for processing into a fire extinguishant sheet is not particularly limited, and any method selected from the following (i) to (iii) can be used as appropriate. (i) A method in which the fire extinguishant composition is molded by extrusion molding. (ii) A method in which the fire extinguishant composition is diluted with a solvent, sprayed into a sheet, and then dried. (iii) A method in which the fire extinguishant composition is diluted with a solvent, coated into a sheet by a coating method such as a bar coater or a spin coater, and then dried.

[0076] During molding, various films such as 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. may be used as a support.

[0077] In addition, LLDPE stands for linear low-density polyethylene, PP stands for polypropylene, COP stands for cycloolefin polymer, CPP stands for non-oriented polypropylene, and PET stands for polyethylene terephthalate.

[0078] PTFE means polytetrafluoroethylene. ETFE means a copolymer of tetrafluoroethylene and ethylene. EFEP means a copolymer of tetrafluoroethylene, ethylene and hexafluoropropylene. PFA means a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene. FEP means a copolymer of tetrafluoroethylene and hexafluoropropylene. PCTFE means polychlorotrifluoroethylene.

[0079] PVC means polyvinyl chloride and PVA means polyvinyl alcohol.

[0080] Of the above processing methods, the method (i) of molding by extrusion molding is particularly preferred.

[0081] Therefore, the method for producing a fire extinguisher sheet of this embodiment can include a kneading step S1 of kneading a fire extinguisher composition and a molding step S2 of molding the kneaded mixture, as shown in flow chart 20 in Fig. 2. That is, in the method for producing a fire extinguisher sheet of this embodiment, the fire extinguisher composition according to the first embodiment or the fire extinguisher composition according to the second embodiment of the present disclosure can be kneaded and molded. Note that if the fire extinguisher composition of this embodiment is sufficiently kneaded, the kneading step may be omitted and the fire extinguisher sheet of this embodiment may be produced by only the molding step. For the purpose of further long-term storage, the fire extinguisher sheet of this embodiment may be stored in a bag made of a material with low moisture permeability, and a sheet having such a structure will also be referred to as a fire extinguisher sheet in this specification.

[0082] For example, the fire extinguishant sheet obtained by any of the above (i) to (iii) and housed in an aluminum pack still functions as a fire extinguishant sheet. Thus, the fire extinguishant sheet of this embodiment may include an aluminum pack processed into a bag shape by lamination or the like, and a molded product of the fire extinguishant composition according to the first embodiment of the present disclosure housed in the aluminum pack. Furthermore, the fire extinguishant sheet of this embodiment may include an aluminum pack processed into a bag shape by lamination or the like, and a molded product of the fire extinguishant composition according to the second embodiment of the present disclosure housed in the aluminum pack.

[0083] The aluminum pack refers to a laminate film in which aluminum foil and a resin film are laminated together, and may have a laminated structure in which the aluminum foil is positioned between two resin films.

[0084] The fire extinguishant composition and fire extinguishant sheet of the first and second embodiments have excellent fire extinguishing properties and long-term storage stability, and therefore contribute to the realization of secondary batteries that are stable and safe for long periods of time. (2) Third Embodiment (2-1) Fire Extinguishant Sheet A fire extinguishant sheet according to a third embodiment of the present disclosure relates to a fire extinguishant sheet that enables efficient fire extinguishing using an aerosol-like fire-extinguishing component. More specifically, the fire extinguishant sheet according to the third embodiment of the present disclosure relates to a fire extinguishant sheet that can more easily impart high fire extinguishing performance to a secondary battery, and a secondary battery can also be formed by laminating the fire extinguishant sheet.

[0085] For example, as disclosed in Patent Documents 2 and 3, conventional fire-extinguishing sheets and films have thicknesses ranging from several μm to several hundred μm, making it difficult to ensure a sufficient amount of fire-extinguishing agent for the target object. While stacking multiple layers is considered a solution to this problem, it is a cumbersome process, and it is difficult to improve fire-extinguishing performance by stacking layers. Furthermore, Patent Document 4 discloses the manufacture of a flame-resistant fiber sheet several mm thick, but this is a flame-resistant fiber sheet impregnated with an aerosol, which does not ensure a sufficient amount of fire-extinguishing agent per unit area, and the manufacturing method is also cumbersome.

[0086] A fire extinguisher sheet according to a third embodiment of the present disclosure contains component (A) a binder, component (B) an inorganic oxidizing agent, and component (C) an alkali metal salt, and can have a thickness of 1.2 mm or more and 10.0 mm or less.

[0087] The fire extinguishing sheet according to the third embodiment improves the fire extinguishing performance per unit area and simplifies the lamination process, making it possible to provide a fire extinguishing sheet that can be particularly applied to secondary batteries.

[0088] Components (A), (B), and (C) can be the same as those described in the first embodiment of the fire extinguisher composition, and therefore further description will be omitted. Component (A) may be, for example, at least one binder selected from thermoplastic resins, thermosetting resins, rubbers, celluloses, and thickening polysaccharides, or may be one or more cellulose derivatives. When component (A) contains a cellulose derivative, the cellulose derivative may be cellulose substituted with a methoxy group and / or a hydroxy (C2-C3) alkoxy group.

[0089] The fire extinguisher sheet of this embodiment may contain other components such as component (D) inorganic acid alkali metal salt, component (E) polyvinylpyrrolidone, catalyst, colorant, antioxidant, flame retardant, inorganic filler, fuel, etc., as long as the effect of the fire extinguisher sheet is not impaired. The same materials as those described in the first embodiment of the fire extinguisher composition may be used for the other components such as component (D) inorganic acid alkali metal salt and (E) polyvinylpyrrolidone, and therefore further description will be omitted. (Thickness of Fire Extinguisher Sheet) The fire extinguisher sheet of this embodiment may have a thickness of 1.2 mm or more and 10.0 mm or less.

[0090] Preferred upper limits of the thickness are, in order of preference, 9.5 mm, 9.0 mm, 8.5 mm, 8.0 mm, 7.5 mm, 7.0 mm, and 6.5 mm, with 6.0 mm being particularly preferred. Lower limits are, in order of preference, 1.5 mm, 1.8 mm, and 2.0 mm, with 2.5 mm being particularly preferred. Therefore, the thickness of the fire extinguishant sheet of this embodiment may be 1.5 mm or more and 9.5 mm or less, 1.5 mm or more and 9.0 mm or less, 1.5 mm or more and 8.5 mm or less, 1.8 mm or more and 8.0 mm or less, 1.8 mm or more and 7.5 mm or less, 1.8 mm or more and 7.0 mm or less, or 2.0 mm or more and 6.5 mm or less. The thickness of the fire extinguishant sheet of this embodiment is most preferably 2.5 mm or more and 6.0 mm or less. If the fire extinguishing sheet is too thin, the fire extinguishing performance per unit area will be poor, and conversely, if it is too thick, the solvent may not dry sufficiently or cracks may occur during drying.

[0091] The thickness of the fire extinguishing agent sheet can be obtained by molding a square fire extinguishing agent sheet, measuring the thickness at the four corners and the center using a Nikon DIGIMICROSTAND (MS-11C), and calculating the average value.

[0092] Specifically, as shown in Fig. 1 , the thickness is measured at measurement points A, B, C, and D at the four corners of the first surface 10A perpendicular to the thickness direction, and at measurement point E at the center, and the arithmetic mean value of the measured thicknesses can be used as the thickness T10 of the fire extinguishant sheet 10. (Maximum Point Load Measurement) The fire extinguishant sheet of this embodiment may have a maximum point load of 8.0 N or more and 650.0 N or less. More preferred upper limits of the maximum point load are 500.0 N, 400.0 N, and 350.0 N, respectively, and particularly preferably 300.0 N. More preferred lower limits are 10.0 N, 20.0 N, 30.0 N, 40.0 N, 45.0 N, 60.0 N, and 80.0 N, respectively, and particularly preferably 100.0 N. Therefore, the maximum point load of the fire extinguishant sheet of the embodiment may be 10.0 N or more and 500.0 N or less, 20.0 N or more and 500.0 N or less, 30.0 N or more and 400.0 N or less, 40.0 N or more and 400.0 N or less, 45.0 N or more and 350.0 N or less, 60.0 N or more and 350.0 N or less, or 80.0 N or more and 350.0 N or less. The maximum point load of the present embodiment is most preferably 100.0 N or more and 300.0 N or less.

[0093] Impact resistance can be particularly improved by setting the maximum point load to 8.0 N or more. Furthermore, by setting the maximum point load to 650.0 N or less, the occurrence of warping and the like can be reduced, making stacking easier.

[0094] The maximum point load of the fire extinguishant sheet can be measured using a Tensilon RTG-1310 manufactured by A&D Corporation. (2-2) Method for Manufacturing Fire Extinguishant Sheet The fire extinguishant sheet of this embodiment can be manufactured, for example, via the following two steps. That is, the method for manufacturing the fire extinguishant sheet of this embodiment can include the following steps (1) and (2), and the fire extinguishant sheet of this embodiment can be manufactured via these steps. The method for manufacturing the fire extinguishant sheet of this embodiment can be carried out, for example, according to flow chart 20 shown in FIG. 2, except that the molding step S2 is an extrusion molding step. Step (1): Kneading step Step (2): Extrusion molding step <Step (1): Kneading step> Step (1) is a step of thoroughly kneading component (A), component (B), component (C), and optionally component (D) and other components at room temperature.

[0095] To confirm whether the composition has been sufficiently kneaded, for example, a thin film is formed using a bar coater or the like, and the presence or absence of aggregates is visually confirmed. <Step (2): Extrusion Molding Step> When producing the fire extinguishant sheet of this embodiment, it is preferable to produce it by extrusion molding. Extrusion molding makes it possible to produce a thick sheet. Therefore, in the extrusion molding step, the fire extinguishant composition, which is the kneaded product obtained in the kneading step, is extrusion molded to obtain a fire extinguishant sheet.

[0096] The fire extinguishing sheet of this embodiment improves fire extinguishing performance per unit area and is easy to layer. Therefore, the fire extinguishing sheet of this embodiment can be particularly applied to secondary batteries. (3) Uses of the Fire Extinguishing Sheet Any of the fire extinguishing sheets of the first, second, and third embodiments described so far can be used, for example, by layering them on one or both sides of a secondary battery cell to impart fire extinguishing performance to the secondary battery. Examples of secondary batteries include lithium-ion secondary batteries, nickel-metal hydride batteries, lithium-sulfur batteries, nickel-cadmium batteries, nickel-iron batteries, nickel-zinc batteries, sodium-sulfur batteries, lead-acid batteries, air batteries, all-solid-state batteries, and all-resin batteries.

[0097] The fire extinguishant composition and the fire extinguishant sheet of the present disclosure have excellent fire extinguishing properties and also have excellent long-term storage stability, and therefore contribute to the realization of secondary batteries that are stable and safe for long periods of time. [Secondary Battery Package] The secondary battery package of this embodiment can be laminated with a fire extinguishant sheet.

[0098] That is, the secondary battery package of this embodiment can have a structure in which a secondary battery and a fire extinguishing agent sheet are stacked.

[0099] For example, as shown in the side view of Figure 3, the secondary battery package 30 of this embodiment can have a secondary battery 31 and a fire extinguishing sheet 32 ​​according to one aspect of the present disclosure arranged adjacent to the secondary battery 31.

[0100] The type of secondary battery 31 included in the secondary battery package 30 of this embodiment is not particularly limited, and may be one or more types selected from, for example, a lithium ion secondary battery, a nickel-metal hydride battery, a lithium-sulfur battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a sodium-sulfur battery, a lead-acid battery, an air battery, an all-solid-state battery, an all-resin battery, and the like.

[0101] The secondary battery package 30 of this embodiment may have a plurality of secondary batteries 31. Furthermore, depending on the size of the secondary batteries 31, the secondary battery package 30 of this embodiment may have a plurality of fire extinguishing agent sheets 32.

[0102] The secondary battery 31 and the fire extinguishing agent sheet 32 ​​may be fixed with tape, adhesive, or the like, or may be removably fixed with a jig or the like (not shown).

[0103] The secondary battery 31 and the fire extinguishing agent sheet 32 ​​may be disposed so as to be in direct contact with each other, or a gap may be provided between them.

[0104] The present invention will be described in more detail below with reference to examples. Note that these descriptions do not limit the present invention, and appropriate modifications are possible within the scope of the present invention. [Experimental Example 1] (1) Production Conditions In Experimental Example 1, in Examples 1-1 to 1-12 and Comparative Example 1-1, the fire extinguishant composition and fire extinguishant sheet according to the first embodiment of the present disclosure were produced and evaluated.

[0105] Fire extinguisher compositions were prepared by thoroughly kneading components (A), (B), and (C) shown in Table 1 in the blending ratios shown in Table 1. In Examples 1-1 to 1-12, 3.0 to 50 parts by mass of potassium sulfate or 6.0 to 20 parts by mass of potassium phosphate was added as component (D) to 100 parts by mass of the total of components (A), (B), and (C), and the mixture was thoroughly ground in a mortar. (2) Evaluation Method and Results (2-1) Cerium-Iron Spark Test 1.0 gram of a mixture of components (A), (B), (C), and (D) mixed in the ratios shown in Table 1 and thoroughly ground in a mortar was weighed onto a heat-resistant plate, and a pistol-type gas lighter was brought close to the mixture at a distance of 5 mm to observe whether or not it ignited. Evaluation was performed according to the following criteria, and the results are shown in Table 1.

[0106] In the cerium-iron spark test, which is an ignition test, the fewer the number of ignitions, the more stable the material is and the less spontaneous combustion it has. Therefore, in the following evaluation, a rating of ◯ indicates the lowest ignition potential and successful suppression of spontaneous combustion, while ratings of △ and × indicate increasing ignition potential and a decreasing degree of spontaneous combustion suppression. A rating of ◯ or △ indicates a sufficiently low ignition potential and successful suppression of spontaneous combustion. ◯: No ignition occurred 11 or more times. △: Ignition occurred between 6 and 10 times. ×: Ignition occurred within 5 times. (2-2) Fire Extinguishing Test 10 parts by mass of water was added to the kneaded mixture (mixture) of components (A), (B), (C), and (D) obtained as described above, and the mixture was kneaded thoroughly by hand. The hand-kneaded water-containing fire extinguisher mixture was thinly spread with a rolling pin to form a fire extinguisher sheet. The formed fire extinguisher sheet was dried in a dryer heated to 100°C until the moisture content was 1% by mass or less.

[0107] A commercially available candle was lit, and 0.30 g of the fire extinguishing agent sheet obtained as described above was picked up with tweezers and placed in the candle flame to observe whether the fire could be extinguished. Evaluation was carried out according to the following criteria, and the results are shown in Table 1. Since the fire was extinguished in all Examples, it was confirmed that the fire extinguishing performance was excellent, but a rating of ◯ means that the fire extinguishing performance was relatively excellent, and a rating of △ means that the fire extinguishing performance was relatively inferior to that of ◯. ◯: The fire was completely extinguished in less than 3 seconds. △: It took 3 seconds or more to completely extinguish the fire. The terms in Table 1 have the following meanings. Metrose (registered trademark): Metrose 90SH-100000 (manufactured by Shin-Etsu Chemical Co., Ltd.) Metrose 90SH-100000 is a hydroxypropyl methylcellulose in which the hydroxy groups in cellulose are substituted with methoxy groups and hydroxypropoxy groups at a certain ratio. As is clear from Table 1, Examples 1-1 to 1-12, which used the fire extinguisher composition of the first embodiment of the present disclosure, showed good properties in the cerium-iron spark test and the fire extinguishing test. In other words, it was confirmed that this fire extinguisher composition has excellent fire extinguishing performance and is capable of suppressing spontaneous combustion.

[0108] On the other hand, Comparative Example 1-1, which did not contain component (D), which is potassium sulfate and potassium phosphate, had fire-extinguishing performance comparable to that of the Examples. However, ignition was confirmed within five tries in the cerium-iron spark test, and the ignition test confirmed instability. [Experimental Example 2] In Experimental Example 2, a fire extinguisher composition and a fire extinguishing sheet according to a second embodiment of the present disclosure were manufactured and evaluated. The manufacturing conditions, evaluation methods, and evaluation results of each Example and Comparative Example are described below. (1) Examples 2-1 to 2-5, Comparative Examples 2-1 to 2-3 (1-1) Manufacturing Conditions Fire extinguisher compositions were prepared by thoroughly mixing component (A), component (B), and component (C) in the respective blending ratios (blending ratios) shown in Table 2 below. The blending amounts in Table 2 are in parts by mass. Ion-exchanged water was added to 100 parts by mass of this mixture of component (A), component (B), and component (C) in the number of parts by mass shown in Table 2, and the mixture was further mixed to obtain a water-containing mixture.

[0109] Approximately 4 g of the resulting water-containing mixture was placed in a mold measuring 30 mm x 30 mm and pressed firmly by hand to form a fire extinguisher sheet. The formed fire extinguisher sheet was dried in a dryer heated to 100°C until the moisture content was 1% by mass or less.

[0110] In Table 2, "Metolose (registered trademark)" refers to "Metolose 90SH-100000" (manufactured by Shin-Etsu Chemical Co., Ltd.), and "CMC-Na" refers to sodium methyl cellulose carboxylate. (1-2) Evaluation Method and Results (1-2-1) Hardness Measurement To measure the hardness shown in Table 2, ion-exchanged water was added to 100 parts by mass of the fire extinguisher composition of each Example and Comparative Example, which was a mixture of components (A), (B), and (C), in the proportions shown in Table 2. The resulting well-kneaded hydrous mixture was rolled into a ball to produce a test specimen. The hardness of the test specimens molded from this hydrous mixture was then measured using a fruit hardness tester (KM-5, manufactured by Sogo Rikagaku Glass Manufacturing Co., Ltd.). (1-2-2) Fire Extinguishing Test The fire extinguishing performance of the fire extinguishing agent sheet was evaluated by cutting out a portion of the fire extinguishing agent sheet measuring 30 mm x 10 mm and bringing it close to a candle flame. If the fire was extinguished within 3 seconds, the test specimen was marked with "Good." If the fire was not extinguished even after 3 seconds, the test specimen was marked with "X." A good result in the fire extinguishing test indicates sufficient fire extinguishing performance, and a poor result indicates poor fire extinguishing performance. As is clear from Table 2, the fire extinguisher composition according to the second embodiment of the present disclosure has sufficient hardness when molded, and it was confirmed to be a fire extinguisher composition excellent in moldability and impact resistance. It is also clear that the fire extinguishing performance is sufficient. (2) Examples 2-6, 2-7, Comparative Example 2-4 (2-1) Production Conditions Fire extinguisher compositions were prepared by thoroughly kneading component (A), component (B), component (C), and component (D) in the blending amounts (blending ratios) shown in Table 3 below. The blending amounts in Table 3 are in parts by mass.

[0111] In this mixture of component (A), component (B), component (C), and component (D), ion-exchanged water was added in the number of parts by mass shown in Table 3 per 100 parts by mass of the total content of component (A), component (B), and component (C), and the mixture was further mixed to obtain a water-containing mixture.

[0112] The resulting water-containing mixture was placed in a mold measuring 30 mm x 30 mm to form a fire extinguisher sheet. The formed fire extinguisher sheet was dried in a dryer heated to 100°C until the moisture content was 1% by mass or less. (2-2) Evaluation Method and Results (2-2-1) Hardness Measurement The hardness measurement was performed under the same conditions and procedures as in "(1-2-1) Hardness Measurement," except that the water-containing mixtures produced in each Example and Comparative Example were used. Therefore, a detailed description is omitted. (2-2-2) Cerium-Iron Spark Test Components (A), (B), (C), and (D) were mixed in the proportions shown in Table 3 and thoroughly ground in a mortar. 1.0 gram of the mixture was weighed onto a heat-resistant plate, and a pistol-type gas lighter was brought close to the mixture at a distance of 5 mm to observe whether or not it ignited. The test was performed five times. The denominator of the notation "0 / 5," for example, shown in the evaluation column, "5" refers to the number of tests, and the number of ignitions is expressed as the numerator. In the cerium-iron spark test, which is an ignition test, the fewer the number of ignitions, the more stable the material is, meaning that it does not have the tendency to spontaneously combust. As is clear from Table 3, the fire extinguisher composition according to the second embodiment of the present disclosure has sufficient hardness and therefore excellent moldability, and it was confirmed that the composition did not ignite in up to five cerium-iron spark tests, i.e., had the effect of suppressing spontaneous combustion. (3) Examples 2-8 to 2-15 (3-1) Production Conditions Fire extinguisher compositions were prepared by thoroughly kneading component (A), component (B), component (C), component (D), and, if necessary, component (E), respectively, in the blending ratios shown in Table 4 below. The blending amounts in Table 4 are in parts by mass. A water-containing mixture was obtained by adding ion-exchanged water in the number of parts shown in Table 4 to 100 parts by mass of this mixture of component (A), component (B), component (C), component (D), and, if necessary, component (E), and further mixing. Approximately 4 g of the obtained water-containing mixture was placed in a mold measuring 30 mm x 30 mm and pressed firmly by hand to form a fire extinguisher sheet. The formed fire extinguishing agent sheet was dried in a dryer heated to 100°C until the moisture content was 1% by mass or less. (3-2) Evaluation Method and Results (3-2-1) Hardness Measurement The hydrous mixture produced in each example was rolled into a spherical shape to form a test specimen. The hardness of the test specimen formed from this hydrous mixture was then measured using a fruit hardness tester (KM-5, manufactured by Sogo Rikagaku Glass Manufacturing Co., Ltd.).

[0113] (3-2-2) Fire Extinguishing Test, Cerium-Iron Spark Test The fire extinguishing test described in "(1-2-2) Fire Extinguishing Test" was carried out using the fire extinguishing agent sheets obtained in each Example. In addition, the cerium-iron spark test described in "(2-2-2) Cerium-Iron Spark Test" was carried out using the fire extinguishing agent compositions obtained in each Example. From Table 4, it was confirmed that the fire extinguisher composition according to the second embodiment of the present disclosure, when using a thickening polysaccharide as the component (A) binder, has particularly high hardness after molding, has excellent moldability, and does not ignite in a cerium-iron spark test, i.e., can suppress spontaneous combustion.

[0114] It was confirmed that the above effect can be obtained not only by using guar gum, which is a thickening polysaccharide, as the component (A) binder, but also by using tara gum, which is a galactomannoglycan like guar gum, xanthan gum, which is a glycomannoglycan, or sodium alginate.

[0115] Furthermore, it was confirmed that the hardness was sufficient even when component (E) polyvinylpyrrolidone was added, and therefore the sheet had excellent moldability and did not ignite in a cerium-iron spark test. [Experimental Example 3] In Experimental Example 3, a fire extinguishing agent sheet according to the third embodiment of the present disclosure was manufactured and evaluated. The manufacturing conditions, evaluation methods, and evaluation results of each example and comparative example are explained below. (1) Manufacturing Conditions Guar gum was used as component (A), potassium chlorate (KClO) was used as component (B), and guar gum was used as component (C). ３ Component (A), component (B), and potassium citrate as component (C) were weighed out in blending ratios of 12 parts by mass, 33.8 parts by mass, and 54.2 parts by mass, respectively. The weighed components were then thoroughly ground and kneaded in a magnetic mortar until the 50% particle size, which is the particle size at 50% volume in the particle size distribution determined by a laser diffraction / scattering method, was 30 μm or less, to prepare a fire extinguisher composition. 11 parts by mass of ion-exchanged water was added to 100 parts by mass of this fire extinguisher composition, which was a mixture of components (A), (B), and (C), and the mixture was placed in a plastic bag with a zipper and thoroughly kneaded by hand to obtain a water-containing mixture.

[0116] The obtained water-containing mixture was placed in a mold having a length x width of 30 mm x 30 mm, and pressed by hand to form a fire extinguishing agent sheet with a uniform thickness.

[0117] The fire extinguishing agent sheet thus formed was dried under reduced pressure at room temperature (25°C) and -0.06 MPa for 24 hours. The pressure was then returned to normal and the sheet was heated to 100°C and dried until the moisture content was 1% by mass or less. (2) Evaluation Method and Results (2-1) Thickness Measurement The thickness of the fire extinguishing agent sheet was measured at the four corners and the center of the square fire extinguishing agent sheet using a Nikon DIGIMICROSTAND (MS-11C), and the average value (arithmetic mean value) was calculated. The measurement points were as described above with reference to Figure 1. (2-2) Maximum Point Load Measurement The maximum point load of the fire extinguishing agent sheet was measured using a Tensilon RTG-1310 manufactured by A&D Corporation. A 30 mm x 30 mm square fire extinguishing agent sheet was placed in the measurement section, and measurements were performed at a test speed of 0.30 mm per minute. (2-3) Fire Extinguishing Test The fire extinguishing performance using the fire extinguishing agent sheet was evaluated by bringing a portion of the fire extinguishing agent sheet cut out to a size of 30 mm x 10 mm close to a candle flame, and rating it as ◯ if the fire was extinguished within 3 seconds, and as × if the fire could not be extinguished even after 3 seconds. A rating of ◯ indicates excellent fire extinguishing performance, and an × indicates poor fire extinguishing performance. As is clear from Table 5, in Experimental Example 3-1 to Example 3-7, which are fire extinguishing sheets with a thickness of 1.2 mm or more and 10.0 mm or less, it was confirmed that they have a high maximum point load, are excellent in formability, have improved fire extinguishing performance per unit area, and are easy to laminate. Therefore, the superiority of the fire extinguishing sheet according to the third embodiment of the present disclosure can be confirmed.

[0118] The fire extinguishant composition and fire extinguishant sheet according to the first embodiment of the present disclosure can provide a fire extinguishant composition and fire extinguishant sheet that have sufficient fire extinguishing performance and suppressed spontaneous combustion, and therefore a secondary battery in which they are stacked can ensure safety over a long period of time.

[0119] The fire extinguishant composition and fire extinguishant sheet according to the second embodiment of the present disclosure can provide a fire extinguishant composition and fire extinguishant sheet that have sufficient fire extinguishing performance and excellent moldability and impact resistance, and therefore a secondary battery formed with these compositions can ensure long-term safety.

[0120] According to the fire extinguishant sheet of the third embodiment of the present disclosure, it is possible to provide a fire extinguishant composition and a fire extinguishant sheet that have sufficient fire extinguishing performance and excellent storage stability, and therefore a secondary battery in which the fire extinguishant sheet is laminated can ensure safety over a long period of time.

[0121] Aspects of the embodiments of the present disclosure are, for example, as follows: (1) A fire extinguisher composition containing component (A) a binder, component (B) an inorganic oxidizing agent, component (C) an organic acid alkali metal salt, and component (D) an inorganic acid alkali metal salt. (2) The fire extinguisher composition according to (1), wherein component (D) is a phosphate or a sulfate. (3) The fire extinguisher composition according to (1) or (2), wherein the content of component (D) is more than 5.0 parts by mass and less than 15.0 parts by mass per 100 parts by mass of the total amount of component (A), component (B), and component (C). (4) The fire extinguisher composition according to any one of (1) to (3), wherein component (A) is cellulose substituted with a methoxy group and / or a hydroxy(C2-C3)alkoxy group. (5) A fire extinguisher composition comprising component (A) a binder, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, and having a hardness after molding of 0.4 kgf / cm ２ 1.60kgf / cm or more ２(6) The fire extinguisher composition according to (5), wherein the component (A) is a thickening polysaccharide. (7) The fire extinguisher composition according to (5) or (6), wherein the component (A) is one or more thickening polysaccharides selected from the group consisting of galactan, galactomannnoglycan, xyloglucan, glucomannoglycan, galactoglucomannoglycan, arabinogalactoglycan, glucoramnoglycan, glycosaminoglycan, alginic acid, alginates, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, and furcellaran. (8) The fire extinguisher composition according to any of (1) to (7), wherein the content of the component (A) is 0.5% by mass or more and 18.5% by mass or less of the total amount of the components (A), (B), and (C). (9) The fire extinguisher composition according to any one of (1) to (8), wherein the component (B) is at least one inorganic oxidizer selected from halates, nitrates, nitrites, borates, ferrates, ferrites, manganates, and permanganates. (10) The fire extinguisher composition according to any one of (1) to (9), wherein the component (B) is at least one inorganic oxidizer selected from nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates, and bromites. (11) The fire extinguisher composition according to any one of (1) to (10), wherein the component (C) is a potassium salt of an organic acid. (12) The fire extinguisher composition according to any one of (1) to (11), further comprising component (E) polyvinylpyrrolidone. (13) A fire extinguisher sheet which is a molded product of the fire extinguisher composition according to any one of (1) to (12). (14) A method for producing a fire extinguisher sheet, which comprises kneading and molding the fire extinguisher composition according to any one of (1) to (12). (15) A fire extinguisher sheet comprising component (A) a binder, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, and having a thickness of 1.2 mm or more and 10.0 mm or less. (16) The fire extinguisher sheet according to (15), which has a maximum point load of 8.0 N or more and 650 N or less. (17) The fire extinguisher sheet according to (15) or (16), wherein component (A) is at least one binder selected from thermoplastic resins, thermosetting resins, rubbers, cellulose derivatives, and thickening polysaccharides.(18) The fire extinguishing sheet according to any one of (15) to (17), wherein the component (A) is one or more cellulose derivatives. (19) The fire extinguishing sheet according to any one of (15) to (18), wherein the component (A) is cellulose substituted with a methoxy group and / or a hydroxy(C2-C3)alkoxy group. (20) The fire extinguishing sheet according to any one of (15) to (19), wherein the component (B) is at least one inorganic oxidizing agent selected from halogenates, nitrates, nitrites, borates, ferrates, ferrites, manganates, and permanganates. (21) The fire extinguishing sheet according to any one of (15) to (20), wherein the component (B) is at least one inorganic oxidizing agent selected from nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates, and bromites. (22) The fire extinguishing sheet according to any one of (15) to (21), wherein the component (C) is an organic potassium salt. (23) A fire extinguisher sheet according to any one of (15) to (22), further containing component (E) polyvinylpyrrolidone. (24) A method for producing a fire extinguisher sheet according to any one of (15) to (23), characterized by going through the following steps (1) and (2): Step (1): Kneading step Step (2): Extrusion molding step (25) A secondary battery package having a secondary battery and the fire extinguisher sheet according to any one of (15) to (24) arranged adjacent to the secondary battery.

[0122] This application claims priority based on Japanese Patent Application No. 2024-111378 filed with the Japan Patent Office on July 11, 2024, Japanese Patent Application No. 2024-111379 filed with the Japan Patent Office on July 11, 2024, and Japanese Patent Application No. 2024-111380 filed with the Japan Patent Office on July 11, 2024, and the entire contents of Japanese Patent Application Nos. 2024-111378, 2024-111379, and 2024-111380 are incorporated by reference into this international application.

[0123] 10 Fire extinguishing agent sheet T10 Thickness A Measurement point B Measurement point C Measurement point D Measurement point E Measurement point 20 Flow diagram S1 Kneading process S2 Molding process 30 Secondary battery package 31 Secondary battery 32 Fire extinguishing agent sheet

Claims

1. A fire extinguishing composition comprising component (A) a binder, component (B) an inorganic oxidizing agent, component (C) an organic acid alkali metal salt, and component (D) an inorganic acid alkali metal salt.

2. The fire extinguishing composition according to claim 1, wherein component (D) is a phosphate or a sulfate.

3. The fire extinguisher composition according to claim 1 or 2, wherein the content of component (D) is greater than 5.0 parts by mass and less than 15.0 parts by mass relative to 100 parts by mass of the total amount of components (A), (B), and (C).

4. A fire extinguishing composition according to claim 1 or 2, wherein component (A) is a cellulose substituted with methoxy groups and / or hydroxy(C2-C3)alkoxy groups.

5. A composition containing component (A) a binder, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, having a hardness of 0.4 kgf / cm after molding. ２ 1.60kgf / cm or more ２ A fire extinguishing composition comprising:

6. The fire extinguishing composition according to claim 5, wherein component (A) is a thickening polysaccharide.

7. The fire extinguishing composition according to claim 5 or 6, wherein component (A) is one or more thickening polysaccharides selected from the group consisting of galactan, galactomannoglycan, xyloglucan, glucomannoglycan, galactoglucomannoglycan, arabinogalactoglycan, glucoramnoglycan, glycosaminoglycan, alginic acid, alginate, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, and furcellaran.

8. A fire extinguisher composition according to any one of claims 1, 2, 5, and 6, wherein the content of component (A) is 0.5 mass% or more and 18.5 mass% or less of the total amount of component (A), component (B), and component (C).

9. The fire extinguishing composition according to any one of claims 1, 2, 5 and 6, wherein component (B) is at least one inorganic oxidizer selected from the group consisting of halides, nitrates, nitrites, borates, ferrates, ferrites, manganates and permanganates.

10. The fire extinguishing composition according to any one of claims 1, 2, 5 and 6, wherein component (B) is at least one inorganic oxidizer selected from nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates and bromites.

11. A fire extinguishing composition according to any one of claims 1, 2, 5 and 6, wherein component (C) is a potassium salt of an organic acid.

12. A fire extinguishing composition according to any one of claims 1, 2, 5 and 6, further comprising component (E) polyvinylpyrrolidone.

13. A fire extinguisher sheet which is a molded product of the fire extinguisher composition according to any one of claims 1, 2, 5 and 6.

14. A method for producing a fire extinguisher sheet, comprising kneading and molding the fire extinguisher composition according to any one of claims 1, 2, 5 and 6.

15. A fire extinguishing sheet containing component (A) a binder, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, and having a thickness of 1.2 mm or more and 10.0 mm or less.

16. The fire extinguishing sheet according to claim 15, wherein the maximum point load is 8.0 N or more and 650 N or less.

17. The fire extinguishing sheet according to claim 15, wherein component (A) is at least one binder selected from thermoplastic resins, thermosetting resins, rubbers, cellulose derivatives, and thickening polysaccharides.

18. The fire extinguishing sheet according to claim 15, wherein component (A) is one or more cellulose derivatives.

19. The fire extinguishing sheet according to claim 15, wherein component (A) is cellulose substituted with methoxy groups and / or hydroxy (C2-C3) alkoxy groups.

20. A fire extinguishing sheet according to any one of claims 15 to 19, wherein component (B) is at least one inorganic oxidizer selected from the group consisting of halides, nitrates, nitrites, borates, ferrates, ferrites, manganates, and permanganates.

21. A fire extinguishing sheet according to any one of claims 15 to 19, wherein component (B) is at least one inorganic oxidizer selected from nitrates, nitrites, chlorates, perchlorates, chlorites, bromates, perbromates, and bromites.

22. A fire extinguishing sheet according to any one of claims 15 to 19, wherein component (C) is a potassium salt of an organic acid.

23. A fire extinguishing sheet according to any one of claims 15 to 19, further comprising component (E) polyvinylpyrrolidone.

24. A method for producing a fire extinguishing sheet according to any one of claims 15 to 19, comprising the steps of (1) and (2) below: Step (1): Kneading step; and Step (2): Extrusion molding step.

25. A secondary battery package comprising: a secondary battery; and a fire extinguishing agent sheet according to any one of claims 15 to 19, disposed adjacent to the secondary battery.

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