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

Abstract

This fire-extinguishing agent composition contains: component (A) which is a cellulose derivative; component (B) which is an inorganic oxidizing agent; and component (C) which is an alkali metal salt of an organic acid. In the total amount of component (A), component (B), and component (C), the proportion of the content of component (A) is 0.5-18.5 mass %.

Description

Fire extinguishing composition, fire extinguishing sheet, and method for producing fire extinguishing sheet

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

[0002] 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. While secondary batteries offer advantages such as high operating voltages and excellent energy densities, they also present significant safety issues, such as the risk of internal short circuits and fires due to overheating. To improve safety, a technique for placing a fire extinguishing agent around the secondary battery has been proposed. For example, Patent Document 1 discloses an electrochemical energy storage device having a housing and at least one electrochemical cell disposed within the housing, in which at least one wall of the housing is coated or supplied with a fire extinguishing agent or a fire extinguishing agent additive, at least in part. However, the technique disclosed in Patent Document 1 may make it difficult to easily extinguish a ignited secondary battery. Furthermore, extinguishing the fire can be difficult due to chain reactions, such as when a high-temperature secondary battery ignites, further increasing its temperature and spreading to the surrounding area.

[0003] 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.

[0004] 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.

[0005] Patent Document 4 discloses a flame-resistant fiber sheet composed of a fire-extinguishing agent component that generates aerosols (radicals) using thermal energy generated by combustion and a flame-resistant fiber sheet substrate. Patent Document 4 also discloses a secondary battery cell or secondary battery cell unit in which individual battery cells and / or assemblies of multiple battery cells are covered with a flame-resistant fiber sheet. However, even with these technologies, sufficient fire-extinguishing performance cannot be achieved. Furthermore, improving fire-extinguishing performance increases affinity with moisture, causing storage stability problems. This makes application to large-capacity secondary batteries difficult.

[0006] Japanese Patent Publication No. 2013-541131 Japanese Patent Publication No. 2021-118847 Japanese Patent Publication No. 2021-137345 Japanese Patent Publication No. 2023-130115

[0007] In view of the above circumstances, an object of the present disclosure is to provide a fire extinguishing composition that has sufficient fire extinguishing performance and also has excellent storage stability.

[0008] A fire extinguisher composition according to one embodiment of the present disclosure comprises a component (A) a cellulose derivative, a component (B) an inorganic oxidizing agent, and a component (C) an organic acid alkali metal salt, wherein the content of the component (A) is 0.5 mass% or more and 18.5 mass% or less of the total amount of the components (A), (B), and (C).

[0009] According to the present disclosure, it is possible to provide a fire extinguishing composition that has sufficient fire extinguishing performance and excellent storage stability.

[0010] 1 is a graph showing the change in moisture absorption rate over time in Examples 2 and 10.

[0011] One embodiment of the present disclosure (hereinafter referred to as "the present embodiment") will be described in detail below. The present invention is not limited to these examples, but is defined by the claims, and all modifications within the meaning and scope of the claims are intended to be included. The fire extinguisher composition of the present embodiment contains component (A) a cellulose derivative, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt. The fire extinguisher composition of the present embodiment is characterized in that the content of component (A) in the total amount of components (A), (B), and (C) is within a specific range. In the following description, the term "component" may be omitted from components (A), (B), (C), and (D), and the components may simply be referred to as (A), (B), (C), and (D). Alternatively, the component may be referred to as component (A), omitting the description of the type of compound of component (A). 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.

[0012] After extensive research, the present inventors have found that the above-mentioned problems can be solved by using a cellulose derivative as a binder and selecting the proportion of the cellulose derivative. [(A) Cellulose Derivative] The (A) cellulose derivative is a cellulose derivative synthesized by modifying some of the hydroxy groups of β-glucose molecules linearly bonded by glycosidic bonds to make it water-soluble. 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 are specifically 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. 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 commercially available as Metolose (registered trademark) SE-SEB and 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 commercially available as Metolose (registered trademark) SH-60SH, 65SH, and 90SH (manufactured by Shin-Etsu Chemical Co., Ltd.). These may be used alone or in combination. The cellulose derivative of component (A) may be cellulose in which the hydroxy groups in cellulose are substituted with, for example, methoxy groups and / or hydroxy(C2-C3)alkoxy groups. Cellulose in which the hydroxy groups in 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 storage stability.In this specification, the expression "A and / or B" means "both A and B, or either A or B."

[0013] [(B) Inorganic Oxidizing Agent] (B) Inorganic oxidizing agent can promote the generation of radicals from (C) organic acid alkali metal salt by the thermal energy of combustion. (B) Inorganic oxidizing agent 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.), Examples of the oxidizing agent include chlorates (potassium bromate, sodium bromate, 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.), carbonates (potassium carbonate, sodium carbonate, etc.), bicarbonates (potassium bicarbonate, sodium bicarbonate, etc.), borates (potassium borate, sodium borate, etc.), ferrates, ferrites, manganates, and permanganates. These may be used alone or in combination. Chlorates, perchlorates, chlorites, hypochlorites, bromates, perbromates, bromites, and hypobromites may be collectively referred to as halogen salts. Therefore, component (B) may be at least one inorganic oxidizing agent selected from halogen salts, nitrates, nitrites, carbonates, bicarbonates, borates, ferrates, ferrites, manganates, and permanganates. Of these, component (B) preferably used in the fire extinguisher composition of the present embodiment may be at least one inorganic oxidizing agent selected from halogen salts such as chlorate, perchlorate, chlorite, hypochlorite, bromate, perbromate, bromite, and hypobromite. Component (B) may more preferably be at least one inorganic oxidizing agent selected from chlorate, perchlorate, chlorite, and hypochlorite. Component (B) may further preferably be at least one inorganic oxidizing agent selected from potassium chlorate and potassium perchlorate, and particularly preferably potassium chlorate.

[0014] [(C) Organic Acid Alkali Metal Salt] The organic acid alkali metal salt (C) can supply alkali metal radicals during combustion of components (A) and (B). As the organic acid alkali metal salt (C), for example, one or more selected from alkali metal acetates, alkali metal propionates, alkali metal citrates, alkali metal ethylenediaminetetraacetates, alkali metal phthalates, and alkali metal oxalates can be used, with alkali metal citrates being preferred. 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). Potassium and sodium are preferred as alkali metals, with potassium being particularly preferred. Therefore, the organic acid alkali metal salt (C) may be an organic acid potassium salt. By using an organic acid potassium salt as the organic acid alkali metal salt (C), the fire extinguishing performance of the fire extinguisher composition can be effectively improved by the fire extinguishing performance provided by potassium radicals.

[0015] In the fire extinguisher composition of this embodiment, the content of component (A) is 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 at least a certain amount 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 it may affect fire extinguishing performance. Therefore, the binder and its content must be determined appropriately through trial and error. In the fire extinguisher composition of this embodiment, a cellulose derivative was found to be optimal as a binder, and the invention was completed using a cellulose derivative as component (A). In this case, the optimal content of component (A) is as described above. 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.

[0016] [Component (D) Polyvinylpyrrolidone] The fire extinguisher composition of this embodiment preferably further contains component (D) polyvinylpyrrolidone. Like component (A), component (D) functions as a binder, but contributes more to improving storage stability. When component (D) is used, its content is preferably 0.1% by mass or more and 10.0% by mass or less based on the total amount of components (A), (B), (C), and (D). More preferred upper limits are 5.0% by mass, 4.0% by mass, and 3.0% by mass, respectively, with 2.0% by mass being particularly preferred. More preferred lower limits are 0.3% by mass, 0.5% by mass, and 0.8% by mass, respectively, with 1.0% by mass being particularly preferred. Therefore, the content of component (D) in 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 preferable content of component (D) in the total amount of components (A), (B), (C), and (D) is 1.0% by mass or more and 2.0% by mass or less.

[0017] [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. <Regarding the Catalyst> The catalyst that may be contained in the fire extinguisher composition of the present embodiment is not particularly limited, but examples thereof include catalysts that promote combustion to make the generation of alkali metal radicals more efficient and that more effectively suppress the combustion of hydrogen that has leaked into the air. 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.

[0018] <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.

[0019] <Antioxidant> The antioxidant that may be contained in the fire extinguisher composition of the present embodiment is not particularly limited, and examples thereof include butylated hydroxytoluene, butylated hydroxyanisole, tertiary butylhydroquinone, gallate, 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.

[0020] <Flame Retardant> The flame retardant that may be contained in the fire extinguisher composition of the present embodiment is not particularly limited, and examples thereof include phosphates, halogenated aromatic compounds, fluorinated iodocarbons, fluorinated bromocarbons, etc. As the flame retardant, one or more types selected from the above-listed candidates can be used.

[0021] <Inorganic Filler> The inorganic filler that may be contained in the fire extinguisher composition of the present embodiment is not particularly limited, and examples thereof 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.

[0022] <Fuel> A fuel may be added to the fire extinguisher composition of the present embodiment in order to more efficiently generate thermal energy through combustion. The fuel to be used is not particularly limited, but examples thereof include dicyandiamide, nitroguanidine, guanidine nitrate, urea, melamine, melamine cyanurate, Avicel, guar gum, 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.

[0023] [Method for Producing Fire Extinguisher Composition] The fire extinguisher composition of this embodiment can be produced by thoroughly mixing and kneading components (A) to (C), and optionally component (D), and other components at room temperature. An organic solvent may be added to improve kneadability. That is, the method for producing the fire extinguisher composition of this embodiment can include a kneading step of kneading raw materials. Examples of raw materials include component (A), component (B), and component (C), and further include component (D) and other components as needed. In the kneading step, each component can be weighed and kneaded so that the proportion of component (A) in the total amount of component (A), component (B), and component (C) is within a predetermined range. Sufficient kneading can be confirmed by visually checking for the presence or absence of aggregates, for example.

[0024] [Fire extinguishant sheet, method for manufacturing fire extinguishant sheet] The fire extinguishant composition of the present embodiment can be processed into a sheet and used as a fire extinguishant sheet. That is, the fire extinguishant sheet of the present embodiment is obtained by molding the fire extinguishant composition of the present embodiment. The fire extinguishant sheet of the present embodiment is a molded product of the fire extinguishant composition of the present embodiment. The method for processing into a fire extinguishant sheet is not particularly limited. For example, 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. 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. LLDPE stands for low-density polyethylene, PP for polypropylene, COP for cycloolefin polymer, and CPP for unstretched polypropylene. PET stands for polyethylene terephthalate. PTFE stands for polytetrafluoroethylene, ETFE for a copolymer of tetrafluoroethylene and ethylene, EFEP for a copolymer of tetrafluoroethylene, ethylene, and hexafluoropropylene, PFA for a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene, FEP for a copolymer of tetrafluoroethylene and hexafluoropropylene, and PCTFE for trichlorotrifluoroethylene. PVC stands for polyvinyl chloride, and PVA stands for polyvinyl alcohol. Of the above processing methods, (i) a molding method by extrusion molding is particularly preferred. Therefore, the manufacturing method of the fire extinguishant sheet of this embodiment can include a kneading step of kneading the fire extinguishant composition of this embodiment and a molding step of molding the kneaded mixture. That is, in the manufacturing method of the fire extinguishant sheet of this embodiment, the fire extinguishant composition of this embodiment can be kneaded and molded.When the fire extinguishant composition of this embodiment is sufficiently kneaded, the kneading step may be omitted and the fire extinguishant sheet of this embodiment may be produced by only the molding step.

[0025] For the purpose of further long-term storage, the fire extinguishant sheet of this embodiment may be stored in a bag made of a material with low moisture permeability, and a product having such a structure is also referred to as a fire extinguishant sheet in this specification. For example, the fire extinguishant sheet obtained by (i) to (iii) above and stored in an aluminum pack still functions as a fire extinguishant sheet. Therefore, the fire extinguishant sheet of this embodiment may include an aluminum pack processed into a bag shape using lamination or the like, and a molded product of the fire extinguishant composition of this embodiment stored in the aluminum pack. Note that the aluminum pack refers to a laminate film in which aluminum foil and a resin film are laminated together.

[0026] [Uses of Fire Extinguisher Sheet] The fire extinguisher sheet of the present embodiment can be used for the purpose of imparting fire extinguishing performance to a secondary battery by laminating it on one or both sides of a secondary battery cell such as 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, etc. The fire extinguisher composition and fire extinguisher sheet of the present embodiment 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 a long period of time.

[0027] The present invention will be described in more detail below with reference to examples. Note that the present invention is not limited to these examples and can be modified as appropriate without departing from the spirit of the invention.

[0028] Examples 1 to 11, Comparative Example 1 Components (A), (B), (C), (D), and other components shown in Table 1 were thoroughly kneaded in the proportions shown in the "Mixing Ratio" column of Table 1. To 100 parts by mass of this mixture of components (A), (B), (C), (D), and other components, 10 to 17 parts by mass of ion-exchanged water was added to achieve the proportion shown in the "Water" column of Table 1, and the mixture was further kneaded. The resulting water-containing kneaded mixture was rolled into a plate approximately 1 mm thick and dried in a dryer heated to 100°C until the moisture content was 1% or less by mass. Fire extinguisher compositions and fire extinguisher sheets were produced using the above procedures. The moisture content was measured using a heated moisture meter (MX-50) manufactured by A&D. The moisture content was measured on a 1.2 g sample that had been removed from the dryer, allowed to cool at room temperature in a desiccator for 10 to 15 minutes, and then ground in a mortar.

[0029] <Fire Extinguishing Test> A commercially available candle was lit, and 0.20 g of the fire extinguisher composition obtained as described above was picked up with tweezers and placed in the candle flame to observe whether it could extinguish the fire. Evaluation was performed according to the following criteria, and the results are shown in Table 1. The evaluation of ◯ indicates the best fire extinguishing performance, while Δ and × indicate decreasing fire extinguishing performance. The evaluation of ◯ indicates that the fire extinguisher composition has excellent fire extinguishing performance. ◯: The fire was completely extinguished in less than 3 seconds. Δ: It took 3 seconds or more to completely extinguish the fire. ×: The fire could not be completely extinguished.

[0030] <Moisture Absorption Rate Test> 1.00 g of the fire extinguisher composition obtained as described above was placed in a watch glass, and the change in moisture absorption rate was observed while the composition was maintained at 25°C and 79% RH in a low-temperature constant temperature and humidity chamber (PL-2KP) manufactured by Espec Corporation. The results are shown in Figure 1. A moisture absorption rate of 60% or less after 8 hours is generally considered to be good and to have excellent storage stability, but it is more preferable that the moisture absorption rate be 50% or less after 8 hours.

[0031] The terms in Table 1 have the following meanings: Metrose (registered trademark): Metrose 90SH-100000 (manufactured by Shin-Etsu Chemical Co., Ltd.) PVP: Polyvinylpyrrolidone CMC-Na: Sodium methyl cellulose carboxylate

[0032] As is clear from Table 1, Examples 1 to 11 of the present invention exhibited good fire extinguishing performance in the fire extinguishing test. On the other hand, Comparative Example 1, which contained 18.8 mass% of component (A), was confirmed to have poor fire extinguishing performance. Furthermore, as is clear from Figure 1, in all Examples, the moisture absorption rate was 60% or less after 8 hours, confirming excellent storage stability. It was also confirmed that Example 2, which used Metolose, in which the hydroxy groups in the cellulose were substituted with methoxy groups and hydroxypropoxy groups at a certain ratio, had a lower moisture absorption rate than Example 10, which used the same amount of CMC-Na.

[0033] According to the present invention, it is possible to provide a fire extinguisher composition and a fire extinguisher sheet that have sufficient fire extinguishing performance and excellent storage stability. Therefore, a secondary battery in which the composition and the sheet are laminated can ensure long-term safety. Examples of embodiments of the present disclosure are as follows: (1) A fire extinguisher composition containing component (A) a cellulose derivative, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, in which 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). (2) The fire extinguisher composition according to (1) above, in which component (A) is cellulose substituted with a methoxy group and / or a hydroxy(C2-C3)alkoxy group. (3) The fire extinguisher composition according to (1) or (2) above, wherein the component (B) is at least one inorganic oxidizing agent selected from halates, nitrates, nitrites, carbonates, hydrogencarbonates, borates, ferrates, ferrites, manganates, and permanganates. (4) The fire extinguisher composition according to any one of (1) to (3) above, wherein the component (B) is at least one inorganic oxidizing agent selected from chlorates, perchlorates, chlorites, hypochlorites, bromates, perbromates, bromites, and hypobromites. (5) The fire extinguisher composition according to any one of (1) to (4) above, wherein the component (C) is an organic acid potassium salt. (6) The fire extinguisher composition according to any one of (1) to (5) above, further comprising component (D) polyvinylpyrrolidone. (7) A fire extinguisher sheet obtained by molding the fire extinguisher composition according to any one of (1) to (6) above. (8) A method for producing a fire extinguisher sheet, comprising kneading and molding the fire extinguisher composition according to any one of (1) to (6) above. This application claims priority to Japanese Patent Application No. 2024-43271, filed with the Japan Patent Office on March 19, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A fire extinguisher composition comprising component (A) a cellulose derivative, component (B) an inorganic oxidizing agent, and component (C) an organic acid alkali metal salt, wherein the content of component (A) is 0.5 mass% or more and 18.5 mass% or less of the total amount of components (A), (B), and (C).

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

3. The fire extinguishing composition according to claim 1 or 2, wherein component (B) is at least one inorganic oxidizer selected from the group consisting of halides, nitrates, nitrites, carbonates, hydrogencarbonates, borates, ferrates, ferrites, manganates, and permanganates.

4. The fire extinguishing composition according to claim 1 or 2, wherein component (B) is at least one inorganic oxidizer selected from chlorates, perchlorates, chlorites, hypochlorites, bromates, perbromates, bromites, and hypobromites.

5. A fire extinguishing composition according to claim 1 or 2, wherein component (C) is a potassium salt of an organic acid.

6. A fire extinguishing composition according to claim 1 or 2, further comprising component (D) polyvinylpyrrolidone.

7. A fire extinguisher sheet obtained by molding the fire extinguisher composition according to claim 1 or 2.

8. A method for producing a fire extinguisher sheet, which comprises kneading and molding the fire extinguisher composition according to claim 1 or 2.

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