Fire extinguishing agent

Abstract

To provide a fire extinguishing agent that enables safe use against electrical fires.SOLUTION: A fire extinguishing agent comprises a metal-organic framework in which carbon dioxide is adsorbed.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to fire extinguishing agents. [Background technology]

[0002] As a fire extinguishing agent used to extinguish a fire, there is a hand-thrown type fire extinguishing agent which is easier to use than a fire extinguisher that sprays the fire extinguishing agent at high pressure. For example, Patent Document 1 proposes a hand-thrown fire extinguisher in which a liquid fire extinguishing agent is obtained by dissolving a chemical mixture of ammonium chloride, potassium carbonate, diammonium phosphate, and sodium bicarbonate in water and sealing it in a resin container. When this fire extinguishing agent is thrown at the source of a fire, the container explodes, and the dispersed liquid fire extinguishing agent undergoes a chemical reaction with the heat of the burning material. This chemical reaction removes heat and oxygen from the source of the fire, and the generation of steam blocks the air, extinguishing the flames. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-257157 Summary of the Invention [Problem to be solved by the invention]

[0004] The fire extinguishing agent described in Patent Document 1 contains water, and water is generated by a chemical reaction when used, so there is a risk of electric shock if used on an electrical fire. In view of the above circumstances, an object of the present disclosure is to provide a fire extinguishing agent that can be safely used against electrical fires. [Means for solving the problem]

[0005] The means for solving the above problems include the following embodiments. <1> A fire extinguishing agent comprising a metal organic framework having carbon dioxide adsorbed thereon. <2> Carbon dioxide is desorbed from the metal-organic framework at a predetermined temperature. <1> 1. A fire extinguishing agent as described in <3> The metal-organic framework is contained in a container, and is used by throwing the container toward a fire source. <1> or <2> 1. A fire extinguishing agent as described in [Effects of the Invention]

[0006] According to the present disclosure, a fire extinguishing agent is provided that is safe for use on electrical fires. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments. In this specification, numerical ranges indicated using "to" include the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In the present specification, the upper or lower limit of one numerical range may be replaced with the upper or lower limit of another numerical range. In addition, in the present specification, the upper or lower limit of a numerical range may be replaced with a value shown in the examples.

[0008] The fire extinguishing agent of the present disclosure comprises a metal-organic framework having carbon dioxide adsorbed thereon. The fire extinguishing agent of the present disclosure does not generate water through a chemical reaction during use, and therefore is highly safe, preventing electric shock hazards when used on electrical fires.

[0009] The fire extinguishing agent of the present disclosure includes a metal organic framework (MOF), which may also be referred to as a porous coordination polymer (PCP).

[0010] Metal-organic frameworks are porous complexes composed of metal ions and organic molecules, and have a much larger surface area than porous materials such as activated carbon and zeolites, allowing them to adsorb and retain large amounts of carbon dioxide. To adsorb a sufficient amount of carbon dioxide onto the metal-organic framework, the BET specific surface area of ​​the metal-organic framework must be 3000 m 2 / g or more, 5000m 2 / g or more, or 8000m 2 The upper limit of the BET specific surface area of ​​the metal organic framework is not particularly limited, but it is preferably 10,000 m 2 / g or less The BET specific surface area of ​​the metal organic framework described above is a value measured by a nitrogen adsorption method. The method for adsorbing carbon dioxide into the metal organic framework is not particularly limited, and can be carried out by a known method.

[0011] The metal organic framework used in the fire extinguishing agent of the present disclosure is preferably one that desorbs adsorbed carbon dioxide at a predetermined temperature, for example, at a temperature of 500°C or higher, 700°C or higher, or 800°C or higher. For example, when a fire extinguishing agent containing a metal-organic framework that releases carbon dioxide at temperatures of 500°C or higher is used at a fire, the carbon dioxide is released from the metal-organic framework at the high temperature of the fire source, generating carbon dioxide gas. The generated carbon dioxide gas cuts off oxygen from the atmosphere around the fire source, thereby exerting a fire-extinguishing effect.

[0012] The type of metal organic framework used in the fire extinguishing agent of the present disclosure is not particularly limited. Specific examples of metal atoms (metal ions) constituting the metal organic structure include zirconium, silver, iron, zinc, cobalt, niobium, cadmium, copper, nickel, chromium, vanadium, titanium, molybdenum, aluminum, beryllium, calcium, cerium, chromium, etc. The metal atoms constituting the metal organic structure may be one type or two or more types.

[0013] Specific examples of organic ligands that constitute the metal organic framework include 1,3,5-tris(4-carboxyphenyl)benzene (BTB), 1,4-benzenedicarboxylic acid (BDC), 2,5-dihydroxy-1,4-benzenedicarboxylic acid (DOBDC), cyclobutyl-1,4-benzenedicarboxylic acid (CB BDC), and 2-amino-1,4-benzenedicarboxylic acid (H2N BDC), tetrahydropyrene-2,7-dicarboxylic acid (HPDC), terphenyl dicarboxylic acid (TPDC), 2,6-naphthalenedicarboxylic acid (2,6-NDC), pyrene-2,7-dicarboxylic acid (PDC), biphenyl dicarboxylic acid (BPDC), 3,3',5,5'-biphenyltetracarboxylic acid, imidazole, benzimidazole, 2-nitroimidazole, cyclobenzimidazole, imidazole-2-carboxaldehyde, 4-cyanoimidazole, 6-methylbenzimidazole, 6-bromobenzimidazole ethanol, 2-methylimidazole, terephthalic acid, 2-aminoterephthalic acid, 5-dihydroxyterephthalic acid, 1,4-naphthalenedicarboxylic acid, 1,3,5-benzenetricarboxylic acid (BTC), 4,4′-biphenyldicarboxylic acid, 4,4″-p-terphenyldicarboxylic acid, isophthalic acid, 1,3,5-benzenetricarboxylic acid, methylimidazole, fumaric acid, naphthalenedicarboxylic acid, hexaazatriphenylene, 2,5-dihydroxybenzoic acid, trimesic acid, 5-cyano-benzenedicarboxylic acid, 5-ethyl-1,3 Examples of suitable benzodicarboxylic acids include terephenyl-3,3',5,5'-tetracarboxylic acid, 9,10-anthracenedicarboxylic acid, 2,2'-diamino-4,4'-stilbene dicarboxylic acid, 2,2'-dinitro-stilbene dicarboxylic acid, 2,5-dihydroxyterephthalic acid, 3,3',5,5'-tetracarboxydiphenylmethane, 1,2,4,5-tetrakis(4-carboxyphenyl)benzene, 4,4',4"-s-triazine-2,4,6-triyl-tribenzoic acid, 2-hydroxyterephthalic acid, biphenyl-3,3',5,5'-tetracarboxylic acid, biphenyl-3,4,5-tricarboxylic acid, 5-bromoisophthalic acid, and malonic acid.

[0014] Specific examples of the metal organic framework include MOF-5, MOF-74, MOF-177, MOF-303, MOF-505, MOF-801, IRMOF-3, IRMOF-6, IRMOF-8, IRMOF-11, ZIF-7, ZIF-9, ZIF-11, ZIF-68, ZIF-69, ZIF-90, ZIF-82, ZIF-70, ZIF-79, ZIF-81, and Uio-66.

[0015] The metal organic framework used in the fire extinguishing agent of the present disclosure may be of one type or two or more types. The form of the metal organic framework used in the fire extinguishing agent of the present disclosure is not particularly limited, and may be in the form of powder, beads, pellets, or the like.

[0016] The fire extinguisher of the present disclosure may be in a state in which the metal organic framework to which carbon dioxide is adsorbed is contained in a container. The type and shape of the container are not particularly limited and can be selected depending on the method of use of the fire extinguisher.

[0017] In certain embodiments, the fire extinguishing agent of the present disclosure may be a hand-thrown fire extinguishing agent (i.e., a fire extinguishing agent that is thrown toward the source of a fire when it is used). When the fire extinguisher of the present disclosure is a hand-thrown type fire extinguisher, the container that houses the metal organic framework to which carbon dioxide is adsorbed is preferably configured so that when the container is thrown toward the source of a fire, the carbon dioxide gas is quickly released outside the container. Specific examples of containers that quickly release carbon dioxide gas outside the container when thrown toward the source of a fire include containers made of materials that are permeable to carbon dioxide gas, containers that easily burst when the extinguishing agent is thrown toward the source of a fire, and containers that can be formed with an opening through which carbon dioxide gas is released just before the extinguishing agent is thrown toward the source of a fire.

[0018] Considering ease of use in an emergency and safety during storage, the container is preferably made of a material that is permeable to carbon dioxide gas. The material of the container is not particularly limited and can be selected from resin, metal, etc. From the viewpoint of ease of throwing the fire extinguishing agent and release of carbon dioxide gas, it is preferable that the material of the container is resin. Specific examples of resins that can be used to make containers include thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, polyurethane, fluororesin, ABS resin, AS resin, acrylic resin, polyamide, polyester, and polyethylene terephthalate.

[0019] From the viewpoint of promoting desorption of carbon dioxide from the metal-organic framework when the fire extinguishing agent is used, the container is preferably made of a material with excellent thermal conductivity.

[0020] There are no particular restrictions on the volume of the container, and it can be set taking into consideration ease of use in the event of a fire. For example, the volume of the container is 200 cm 3 ~1,000cm 3 may be selected from the range.

[0021] In some embodiments, the fire extinguishing agent of the present disclosure may be a propellant type fire extinguishing agent. When the fire extinguishing agent of the present disclosure is a spray-type fire extinguishing agent, the metal-organic framework to which carbon dioxide is adsorbed may be contained in a container together with a liquefied gas. When the fire extinguishing agent of the present disclosure is a spray-type fire extinguishing agent, the material of the container is preferably selected from materials having excellent pressure resistance.

[0022] In certain embodiments, the fire extinguishing agent of the present disclosure may be a spray type fire extinguishing agent (i.e., the extinguishing agent is sprayed toward the source of a fire when a fire occurs). When the fire extinguishing agent of the present disclosure is a spray-type fire extinguishing agent, the metal-organic framework having carbon dioxide adsorbed thereto is taken out of the container before use. Therefore, the material of the container is not particularly limited and can be selected taking into consideration safety during storage, etc.

Claims

1. A fire extinguishing agent comprising a metal organic framework having carbon dioxide adsorbed thereon.

2. 2. The fire extinguishing agent according to claim 1, wherein carbon dioxide is desorbed from the metal-organic framework at a predetermined temperature.

3. 3. The fire extinguisher according to claim 1 or 2, wherein the metal-organic framework is contained in a container, and the container is used by throwing it toward a source of fire.