Fire-extinguishing material, fire-extinguishing material package, and electrical installation

Abstract

Disclosed is a fire-extinguishing material comprising a first fire-extinguishing body that has a fire-extinguishing composition layer, and at least one second fire-extinguishing body that is provided stacked on the fire-extinguishing composition layer of the first fire-extinguishing body. The second fire-extinguishing body has a fire-extinguishing composition layer and a base material disposed on the first fire-extinguishing body-side relative to the fire-extinguishing composition layer. The thickness of the base material is at least 25 μm. The fire-extinguishing composition layer contains a fire-extinguishing composition and a binder resin. The first fire-extinguishing body may additionally have a base material on the opposite side of the fire-extinguishing composition layer of the first fire-extinguishing body from the second fire-extinguishing body.

Description

Fire extinguishing material, fire extinguishing material package, and electrical equipment

[0001] The present disclosure relates to a fire extinguishing material, a fire extinguishing material package, and electrical equipment.

[0002] In electrical equipment such as switchboards, distribution boards, electrical appliances, or storage batteries, ignition may occur due to a short circuit or the like. Therefore, in electrical equipment, from the perspective of minimizing damage caused by such ignition, it is desirable to perform a fire extinguishing operation immediately after ignition, that is, initial fire extinguishing. Patent Document 1 below discloses a battery module that has a single battery inside a housing and has a fire extinguishing sheet disposed on the upper surface side or the side surface side of the single battery as electrical equipment that performs such initial fire extinguishing. When ignition occurs in the single battery, the fire extinguishing sheet in the above battery module can melt out and extinguish the fire.

[0003] Japanese Patent Application Laid-Open No. 2022-145344

[0004] By the way, for example, in electrical equipment having a battery or a switchboard, once a short circuit occurs, the spark generated by the short circuit may ignite a fire source such as dust and reignite, resulting in the generation of a flame. However, the fire extinguishing sheet described in Patent Document 1 may consume all the fire extinguishing agent even if the flame is small once the self-extinguishing function is activated. Therefore, the fire extinguishing sheet described in Patent Document 1 has a problem that it cannot extinguish a fire even if a small-scale flame occurs again later and cannot extinguish a plurality of small-scale flames.

[0005] The present disclosure has been made in view of the above circumstances, and provides a fire extinguishing material, a fire extinguishing material package, and electrical equipment that can extinguish such small-scale flames even if a plurality of small-scale flames occur.

[0006] One aspect of the present disclosure includes a first fire extinguishing body having a fire extinguishing agent layer, and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body. The second fire extinguishing body has a fire extinguishing agent layer and a base material disposed closer to the first fire extinguishing body side than the fire extinguishing agent layer. The thickness of the base material is 25 μm or more, and the fire extinguishing agent layer contains a fire extinguishing agent and a binder resin, and provides a fire extinguishing material.

[0007] According to the above-mentioned fire extinguishing material, for example, if the fire extinguishing material has multiple second fire extinguishing elements (hereinafter also referred to as "fire extinguishing elements"), when a small flame occurs in an object to be extinguished, such as electrical equipment, and the second fire extinguishing element of the fire extinguishing material located furthest from the first fire extinguishing element (hereinafter also referred to as "fire extinguishing element") is heated, the heat causes the extinguishing agent in the extinguishing agent layer of the second fire extinguishing element to react, activating the fire extinguishing function of the extinguishing agent layer and extinguishing the flame. At this time, since the second fire extinguishing element has a base material located on the side of the first fire extinguishing element, the extinguishing agent layer of the second fire extinguishing element located on the opposite side of the flame is less likely to be heated, and the activation of the fire extinguishing function of its extinguishing agent layer is suppressed by small flames. Subsequently, if a small flame reappears at the object to be extinguished, the remaining base material of the second fire extinguishing unit is heated, causing the base material to melt or dissolve due to the heat of the flame. The extinguishing agent layer of the second fire extinguishing unit, which is positioned on the side of the base material opposite the flame, is either directly facing the flame or indirectly facing the flame via the base material and is sufficiently heated. As a result, the extinguishing function of the extinguishing agent layer of the second fire extinguishing unit is activated, and the small flame is extinguished. Thereafter, each time a small flame reappears, the extinguishing function of the second fire extinguishing unit is activated for each second fire extinguishing unit, and the flame is extinguished. Finally, the extinguishing function of the first fire extinguishing unit is activated, and the flame is extinguished. Thus, with the fire extinguishing material of this disclosure, even if multiple small flames occur, the extinguishing function of the extinguishing agent layer of the fire extinguishing unit is activated for each small flame, thus enabling the extinguishing of such small fires.

[0008] The above-mentioned fire extinguishing material may further include a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body that is opposite to the second fire extinguishing body.

[0009] In the above-mentioned fire extinguishing material, the thickness of the base material may be 30 μm or more. When the thickness of the base material is 30 μm or more, the heat insulation or strength of the base material becomes sufficiently high, making it easier to suppress the simultaneous activation of the fire extinguishing functions of multiple fire extinguishing agent layers in the fire extinguishing material in response to small flames. In addition, in each of the multiple small flames, heat is less likely to be transferred to the fire extinguishing agent layer of the fire extinguishing body that is located on the opposite side of the flame among the fire extinguishing bodies that have activated their fire extinguishing function, making it easier to suppress the simultaneous activation of those fire extinguishing agent layers. As a result, the fire extinguishing material can more reliably extinguish multiple small flames. Furthermore, when the thickness of the base material is 30 μm or more, the rigidity of the base material increases, making it less likely for wrinkles or stretching to occur in the fire extinguishing agent layer, making it easier to obtain a fire extinguishing material of uniform and stable quality. Furthermore, if the substrate thickness is 30 μm or more, when the substrate is exposed to the heat of the flame, it becomes less likely to shrink or its edges to curl, making it easier to maintain proper coverage of the fire extinguishing agent layer by the substrate. This also reduces the supply of air through the gap between the substrate and the fire extinguishing agent layer, thereby increasing the success rate of fire extinguishing.

[0010] In the above-mentioned fire extinguishing material, it is preferable that the thickness of the base material is 200 μm or less. When the thickness of the base material is 200 μm or less, in the event of a large-scale flame, the base material becomes more easily melted in each of the fire extinguishing elements contained in the fire extinguishing material, or the heat from the flame is more easily transferred simultaneously to the fire extinguishing agent layer of each fire extinguishing element due to the thinness of the base material, making it easier for multiple fire extinguishing agent layers corresponding to the scale of the flame to activate their fire extinguishing function all at once. For this reason, the fire extinguishing material can extinguish even large-scale flames.

[0011] In the above-mentioned fire extinguishing material, the thickness of the base material may be 100 μm or less. In this case, when a large-scale flame occurs, the fire extinguishing material can extinguish the flame more effectively. Furthermore, because the base material is thinner, the entire fire extinguishing material can be made thinner, and the fire extinguishing material can be installed in a narrow space.

[0012] In the above-described fire extinguishing material, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material may be 2 or more in the first fire extinguishing body and the second fire extinguishing body. In this case, when a large-scale flame occurs, the fire extinguishing material can extinguish the large-scale flame more effectively.

[0013] In the above-mentioned fire extinguishing material, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material may be 15 or less.

[0014] In the above-mentioned fire extinguishing material, it is preferable that the extinguishing agent contains at least one of an organic salt and an inorganic salt. In this case, the fire extinguishing function is more easily activated when the extinguishing agent layer is heated by the flame, and the flame is effectively extinguished.

[0015] In the above-described fire extinguishing material, both the base material of the first fire extinguishing body and the base material of the second fire extinguishing body may contain polyester resin. In this case, since polyester film has lower heat resistance and melting point compared to polyimide film, glass cloth, etc., the base material is more likely to melt or burn and be destroyed quickly by the heat of the fire. When the base material is destroyed, the fire extinguishing agent layer, which was previously supported by the base material, is completely exposed to the flames. This allows the fire extinguishing agent in the fire extinguishing agent layer to react effectively, and large-scale flames can be effectively extinguished.

[0016] In the above-mentioned fire extinguishing material, the polyester resin may be polyethylene terephthalate. In this case, large-scale flames can be extinguished more effectively.

[0017] Another aspect of this disclosure is the provision of a fire extinguishing material package comprising the fire extinguishing material and a packaging bag for enclosing the fire extinguishing material. With the fire extinguishing material package, as long as no flames are generated at the object to be extinguished, such as electrical equipment, the packaging bag prevents moisture contained in the outside air from entering the packaging bag, thereby suppressing deterioration of the fire extinguishing agent layer contained in the fire extinguishing material due to moisture. As a result, the fire extinguishing material package can suppress the decline in effectiveness of being able to extinguish multiple small flames over a long period of time. Furthermore, even if multiple small flames occur at the object to be extinguished, such as electrical equipment, and the fire extinguishing material is exposed and heated by those flames, the fire extinguishing material can extinguish such multiple small flames.

[0018] In the above-described fire extinguishing material package, the packaging bag may have an outer layer, and the outer layer may have a barrier layer. In this case, large-scale flames can be extinguished more effectively.

[0019] Another aspect of this disclosure provides an electrical system comprising an object to be extinguished, which is an electrical device, and the fire extinguishing material described above. With this electrical system, the fire extinguishing material can extinguish multiple small flames, so even if multiple small flames occur in the electrical device which is the object to be extinguished, the fire extinguishing material can extinguish such multiple small flames.

[0020] Another aspect of this disclosure provides an electrical system comprising an object to be extinguished, which consists of an electrical device, and the fire extinguishing material package. With this electrical system, the fire extinguishing material contained in the fire extinguishing material package can extinguish multiple small flames, so that even if multiple small flames occur at the object to be extinguished and the fire extinguishing material is exposed and heated by the flames, the fire extinguishing material can extinguish such multiple small flames.

[0021] A further aspect of the present disclosure provides a fire extinguishing material comprising a first fire extinguishing body having a fire extinguishing agent layer, and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body, wherein the second fire extinguishing body has a fire extinguishing agent layer and a base material disposed on the side of the first fire extinguishing body that is closer to the fire extinguishing body than the fire extinguishing agent layer, the thickness of the base material is 40 μm or more and 60 μm or less, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 2 or more and 5 or less, the fire extinguishing agent layer comprises a fire extinguishing agent and a binder resin, the first fire extinguishing body further has a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body that is opposite to the second fire extinguishing body, the fire extinguishing agent comprises an organic salt and an oxidizing agent, the fire extinguishing agent comprises potassium carboxylate, the oxidizing agent comprises potassium chlorate, the binder resin comprises a polyurethane resin, and both the base material of the first fire extinguishing body and the base material of the second fire extinguishing body are polyethylene terephthalate films. The fire extinguishing material of this disclosure can extinguish multiple small-scale fires, and can also effectively extinguish large-scale fires.

[0022] According to this disclosure, a fire extinguishing material, a fire extinguishing material package, and electrical equipment are provided that can extinguish small-scale fires even if multiple small-scale fires occur.

[0023] Figure 1 is a schematic cross-sectional view showing one embodiment of the fire extinguishing material package of the present disclosure. Figure 2 is a schematic partial cross-sectional view showing another example of the outer packaging material of the fire extinguishing material package of Figure 1. Figure 3 is a schematic front view showing one embodiment of the electrical equipment of the present disclosure.

[0024] <<Fire Extinguishing Material Package>> Hereinafter, embodiments of the fire extinguishing material package of the present disclosure will be described with reference to Figure 1. Figure 1 is a schematic cross-sectional view showing one embodiment of the fire extinguishing material package of the present disclosure. As shown in Figure 1, the fire extinguishing material package 100 comprises a fire extinguishing material 10 and a packaging bag 50 for enclosing the fire extinguishing material 10. The fire extinguishing material 10 is one embodiment of the fire extinguishing material according to the present disclosure. The fire extinguishing material 10 comprises a first fire extinguishing body 20A having a fire extinguishing agent layer 12 and a second fire extinguishing body 20B which is provided on top of the fire extinguishing agent layer 12 of the first fire extinguishing body 20A. Hereinafter, "first fire extinguishing body 20A" and "second fire extinguishing body 20B" will also be referred to as "fire extinguishing body 20". The second fire extinguishing body 20B has a fire extinguishing agent layer 12 and a base material 14 which is arranged on the side of the first fire extinguishing body 20A that is closer to the fire extinguishing agent layer 12. The thickness of the base material 14 is 25 μm or more. As shown in Figure 1, the first fire extinguishing body 20A may further have a base material 14 on the side opposite to the second fire extinguishing body 20B. The packaging bag 50 is a bag obtained using a laminate 60 (or a bag comprising a laminate 60), and the laminate 60 comprises a base material layer 61 and a sealant layer 62. In Figure 1, the packaging bag 50 is a bag obtained using two laminates 60, and the sealant layers 62 of the laminates 60 are bonded together.

[0025] According to the fire extinguishing material package 100 described above, as long as no flames are generated at the object to be extinguished, such as electrical equipment, the packaging bag 50 prevents moisture contained in the outside air from entering the packaging bag 50, thereby suppressing deterioration of the fire extinguishing agent layer 12 that constitutes the fire extinguishing body 20 of the fire extinguishing material 10 due to moisture. For this reason, the fire extinguishing material package 100 can suppress the decline in effectiveness, which allows it to extinguish multiple small-scale flames over a long period of time. Furthermore, when flames are generated at the object to be extinguished, such as electrical equipment, and the fire extinguishing material 10 is exposed by the flames and heated from the second fire extinguishing body 20B side, the heat causes the fire extinguishing agent in the fire extinguishing agent layer 12 of the second fire extinguishing body 20B to react, activating the fire extinguishing function of the fire extinguishing agent layer 12 and extinguishing the flames. At this time, since the second fire extinguishing unit 20B has a base material 14 positioned on the side of the first fire extinguishing unit 20A, the fire extinguishing agent layer 12 of the first fire extinguishing unit 20A, which is positioned on the side of the second fire extinguishing unit 20B opposite to the flame, is less likely to be heated, and the activation of the fire extinguishing function of the fire extinguishing agent layer 12 is suppressed by small flames. Subsequently, if small flames occur again at the object to be extinguished, the remaining base material 14 of the second fire extinguishing unit 20B is heated, and the base material 14 melts or dissolves due to the heat of the flame, and the fire extinguishing agent layer 12 of the first fire extinguishing unit 20A, which is positioned on the side of the base material 14 opposite to the flame, is either directly facing the flame or the fire extinguishing agent layer 12 is indirectly facing the flame via the base material 14 and is sufficiently heated. As a result, the fire extinguishing function of the fire extinguishing agent layer 12 of the first fire extinguishing unit 20A is activated, and the small flame is extinguished. Thus, with the fire extinguishing material 10, even if multiple small-scale flames occur (twice in the case of the fire extinguishing material 10 shown in Figure 1), the fire extinguishing agent layer 12 of the fire extinguishing body 20 is activated for each small-scale fire, so the fire extinguishing material 10 can extinguish such multiple small-scale flames.

[0026] The fire extinguishing material 10 and packaging bag 50 will be described below.

[0027] <Fire extinguishing material> As previously mentioned, the fire extinguishing material 10 comprises a first fire extinguishing body 20A and a second fire extinguishing body 20B which is placed on top of the fire extinguishing agent layer 12 of the first fire extinguishing body 20A. Although the fire extinguishing material 10 shown in Figure 1 has only one second fire extinguishing body 20B, it is sufficient to have at least one second fire extinguishing body 20B. Here, the number of second fire extinguishing bodies 20B can be adjusted as appropriate according to the expected number of small-scale fires. For example, if the expected number of small-scale fires is two, the number of second fire extinguishing bodies 20B can be one or more, and if the expected number of small-scale fires is three or more, the number of second fire extinguishing bodies 20B can be two or more.

[0028] The thickness of the fire extinguishing material 10 is not particularly limited, but from the viewpoint of more effectively extinguishing multiple small-scale fires and from the viewpoint of handling the fire extinguishing material 10, it may be, for example, 50 μm or more, 80 μm or more, 100 μm or more, 120 μm or more, 150 μm or more, 200 μm or more, 500 μm or more, or 800 μm or more. From the viewpoint of installation in a narrow space, the thickness of the fire extinguishing material 10 may be 10 mm or less, 8 mm or less, 5 mm or less, 3 mm or less, or 1 mm or less.

[0029] (1) Fire extinguishing agent layer The fire extinguishing agent layer 12 is a layer that releases a fire extinguishing agent or a reaction product of the fire extinguishing agent when heated by a flame, thereby activating its fire extinguishing function.

[0030] The thickness of the fire extinguishing agent layer 12 can be adjusted as appropriate depending on the expected scale of the flame. For example, the thickness of the fire extinguishing agent layer 12 can be 10 μm to 600 μm. A thickness of 10 μm or more in the fire extinguishing agent layer 12 makes it easier for each fire extinguishing agent layer 12 to achieve good fire extinguishing performance, so the fire extinguishing material 10 can effectively extinguish multiple small flames. Furthermore, a thickness of 600 μm or less in the fire extinguishing agent layer 12 can further improve the uniformity of the thickness of the fire extinguishing agent layer 12, and the fire extinguishing material 10 can be installed in a narrow space. The thickness of the fire extinguishing agent layer 12 may also be 20 μm or more, 50 μm or more, or 100 μm or more. The thickness of the fire extinguishing agent layer 12 may also be 300 μm or less, 250 μm or less, 200 μm or less, or 150 μm or less. The thickness of the fire extinguishing agent layer 12 may be 20 μm or more and 300 μm or less, 50 μm or more and 250 μm or less, 100 μm or more and 200 μm or less, or 100 μm or more and 150 μm or less. The thickness of the fire extinguishing agent layer 12 is, for example, the average value of the thickness at any five locations in an enlarged image of the cross-section of the fire extinguishing material 10.

[0031] The ratio R of the thickness of the fire extinguishing agent layer 12 to the thickness of the base material 14 is not particularly limited and may be 2 or more, 2.5 or more, or 3 or more. When the ratio R is 2 or more, the fire extinguishing material can extinguish large-scale flames more effectively in the event of a large-scale fire. The ratio R may be 15 or less, 12 or less, 10 or less, 8 or less, or 5 or less. The ratio R may be 2 or more and 15 or less, 2.5 or more and 12 or less, 2.5 or more and 10 or less, 2.5 or more and 8 or less, or 3 or more and 5 or less.

[0032] The surface area of ​​the interface between the fire extinguishing agent layer 12 and the base material 14 can be appropriately set according to the intended use and installation location of the fire extinguishing agent package 100.

[0033] The fire extinguishing agent layer 12 contains a fire extinguishing agent and a binder resin. The fire extinguishing agent layer 12 can be obtained by a fire extinguishing agent layer forming composition containing a fire extinguishing agent and a binder resin. The fire extinguishing agent layer forming composition may further contain a liquid medium and may further contain other components. Each fire extinguishing agent layer 12 may have a different composition or the same composition. When each fire extinguishing agent layer 12 has the same composition, the fire extinguishing material 10 can be manufactured efficiently.

[0034] (Fire extinguishing agent) The fire extinguishing agent has the property of releasing itself or its reaction products in response to heat. As a fire extinguishing agent, a substance having at least one of the so-called four elements of fire extinguishing (removal action, cooling action, suffocation action, and negative catalytic action) can be used alone or in appropriate mixtures depending on the object to be extinguished. The fire extinguishing agents contained in the multiple fire extinguishing agent layers 12 may all be the same compound or may be different compounds from one another. If the fire extinguishing agents contained in the multiple fire extinguishing agent layers 12 are the same compound, the manufacturing efficiency of the fire extinguishing material 10 can be improved. The fire extinguishing agent may contain at least one of an organic salt and an inorganic salt that has fire extinguishing properties. The organic salt and the inorganic salt may be used individually or two or more may be used in combination. One of the multiple fire extinguishing agent layers 12 may contain the above organic salt or inorganic salt, or multiple fire extinguishing agent layers 12 may contain an organic salt or inorganic salt.

[0035] Examples of organic salts that function as fire extinguishing agents include potassium salts, sodium salts, and ammonium salts. From the viewpoint of usefulness in negative catalytic effect, potassium salts (hereinafter also referred to as "organic potassium salts") can be suitably used as organic salts. Examples of organic potassium salts include potassium acetate, potassium citrate (monotonic citrate, dipotassium citrate, tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate, which are potassium carboxylate salts. Of these, potassium citrate can be suitably used in particular from the viewpoint of efficiency in negative catalytic effect on combustion.

[0036] Examples of inorganic salts that function as fire extinguishing agents include potassium salts and sodium salts. From the viewpoint of usefulness for negative catalytic effect, potassium salts (hereinafter also referred to as "inorganic potassium salts") can be suitably used as inorganic salts. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium bicarbonate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate.

[0037] The fire extinguishing agent may be in granular form. The average particle size D50 of the organic or inorganic salt contained in the fire extinguishing agent can be 1 to 100 μm, or it may be 3 to 40 μm. When the average particle size D50 is above the lower limit, the dispersibility of the fire extinguishing agent in the coating liquid is improved, and the homogeneity of the fire extinguishing agent layer 12 obtained by forming the coating film tends to improve. When the average particle size D50 is below the upper limit, the stability of the fire extinguishing agent in the coating liquid is improved, and the smoothness of the fire extinguishing agent layer 12 obtained by drying the coating liquid tends to improve. The average particle size D50 can be calculated by wet measurement using a laser diffraction particle size distribution analyzer.

[0038] The fire extinguishing agent may contain other components besides the organic and inorganic salts mentioned above. Examples of other components include oxidizing agents to improve the reactivity of the organic and inorganic salts, specifically potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, magnesium chlorate, potassium nitrate, sodium nitrate, strontium nitrate, ammonium perchlorate, potassium perchlorate, basic copper nitrate, copper(I) oxide, copper(II) oxide, iron(II) oxide, iron(III) oxide, and molybdenum trioxide. Among these, potassium chlorate is preferred. From the viewpoint of further improving the fire extinguishing function of the fire extinguishing material 10, at least one of the fire extinguishing agents contained in the multiple fire extinguishing agent layers 12 may further contain an oxidizing agent, or all of the fire extinguishing agents contained in the fire extinguishing agent layers 12 may further contain an oxidizing agent.

[0039] The amount of fire extinguishing agent may be 70 to 97% by mass or 85 to 92% by mass, based on the total amount of fire extinguishing agent and binder resin (100% by mass). If the amount of fire extinguishing agent is below the above upper limit, it is easier to suppress the deliquescence of the fire extinguishing agent even if the fire extinguishing agent is hygroscopic, and the deterioration of the fire extinguishing function due to moisture absorption of the fire extinguishing agent layer 12 can be suppressed. In addition, it becomes easier to form a homogeneous fire extinguishing agent layer 12. On the other hand, if the amount of fire extinguishing agent is above the above lower limit, the fire extinguishing material 10 has good fire extinguishing function.

[0040] (Binder Resin) The binder resin is a component that enables the formation of the fire extinguishing agent layer 12 and gives flexibility to the fire extinguishing agent layer 12. The binder resin is a resin obtained using a resin composition that includes a thermoplastic resin or a thermosetting resin as the resin. The resin composition may also contain other components in addition to the resin. The amount of binder resin may be 3 to 30% by mass or 8 to 15% by mass, based on the total amount of fire extinguishing agent and binder resin (100% by mass). When the amount of binder resin is below the above upper limit, the fire extinguishing material 10 has good fire extinguishing function. When the amount of binder resin is above the above lower limit, it is easier to form a homogeneous fire extinguishing agent layer 12. In addition, the fire extinguishing agent layer 12 tends to have sufficient flexibility.

[0041] Examples of thermoplastic resins include polypropylene resins, polyethylene resins, poly(1-)butene resins, polypentene resins and other polyolefin resins, polystyrene resins, acrylonitrile-butadiene-styrene resins, methyl methacrylate-butadiene-styrene resins, ethylene-vinyl acetate resins, ethylene-propylene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins, polyvinyl chloride resins, polyvinyl alcohol (PVA), polyvinyl acetal resins, and polyurethane resins. Of these resins, polyvinyl acetal resins and polyurethane resins can be suitably used from the viewpoint of film-forming properties. Examples of polyvinyl acetal resins include polyvinyl butyral (PVB). Of the above thermoplastic resins, polyurethane resins can be suitably used from the viewpoint of achieving both film-forming properties and improved reactivity of the fire extinguishing agent. In addition to achieving both of these, ether-based polyurethane resins can be suitably used from the viewpoint of providing flexibility and water resistance to the fire extinguishing agent layer 12.

[0042] As the thermosetting resin, there may be mentioned rubbers such as natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polysulfide rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U), etc., polyurethane resin, polyisocyanate resin, polyisocyanurate resin, phenol resin, epoxy resin, and polyvinyl ether (PMVE)-maleic anhydride resin, etc.

[0043] As other components other than the resin in the resin composition, there may be mentioned a curing agent. Further, from the viewpoint of the property stability of the binder resin, the resin composition may contain, as other components, a surfactant, a silane coupling agent, an antiblocking agent, an adhesion-imparting agent, etc. These other components can be appropriately selected according to the type of resin contained in the binder resin. The amount of other components contained in the binder resin can be 70% by mass or less based on the total amount of the binder resin, may be 30% by mass or less, or may be 0% by mass.

[0044] (Liquid medium) When the composition for forming the fire extinguishing agent layer contains a liquid medium, examples of the liquid medium include organic solvents. Examples of the organic solvent include water-soluble solvents, such as alcohols such as methanol, ethanol, isopropyl alcohol, and n-propyl alcohol; ketones such as acetone and methyl ethyl ketone; glycols such as ethylene glycol and diethylene glycol; glycol ethers such as N-methylpyrrolidone (NMP), tetrahydrofuran, and butyl cellosolve. From the viewpoint that organic salts and inorganic salts have deliquescence properties, the liquid medium may be an alcohol-based solvent, and specifically, ethanol may be used.

[0045] (Other Components) When the composition for forming the fire extinguishing agent layer contains other components in addition to the fire extinguishing agent, binder resin, and liquid medium, examples of the other components include colorants, antioxidants, flame retardants, inorganic fillers, fluidity imparting agents, moisture-proof agents, dispersants, UV absorbers, flexibility imparting agents, adhesion imparting agents, catalysts, and the like. These components can be appropriately selected according to the type of salt and the type of binder resin. In addition, when the above other components are contained in the resin composition for forming the binder resin, they may not be contained in the composition for forming the fire extinguishing agent layer. The amount of other components contained in the fire extinguishing agent layer 12 can be 40% by mass or less based on the total amount of the fire extinguishing agent layer 12, may be 10% by mass or less, may be 0.1% by mass or more, or may be 0% by mass.

[0046] (2) Base Material The base material 14 serves as a support for the fire extinguishing agent layer 12, imparts appropriate heat insulation between two adjacent fire extinguishing bodies 20, and enables the fire extinguishing material 10 to extinguish multiple small-scale flames by suppressing the simultaneous activation of multiple fire extinguishing agent layers 12 when the fire extinguishing material 10 is heated by a small-scale flame. The base material 14 may be composed of a single layer or multiple layers.

[0047] The base material 14 only needs to have both a high level of heat insulation such that the simultaneous activation of the fire extinguishing agent layer 12 against a small-scale flame can be suppressed as described above, a low level of heat resistance such that it melts or fuses by the heat of the flame, or a low level of strength such that it breaks by the impact when the fire extinguishing agent layer 12 is activated. Examples of the material constituting the base material 14 include resins, metal foils (such as aluminum foil, copper foil, etc.), non-combustible paper, and non-woven fabrics made of inorganic materials. When the base material 14 includes a metal foil, non-combustible paper, or non-woven fabric made of an inorganic material, these materials are unlikely to become a combustible part and thus are unlikely to serve as a fuel for the flame. In addition, since the base material 14 is difficult to melt by heat, the aerosol blowing direction when the fire extinguishing material 10 reacts is likely to be stable.

[0048] Examples of resins include polyolefins (LLDPE, PP, COP, CPP, etc.), polyester resins (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. The above resins may consist of a single resin or a combination of multiple resins. When the base material 14 contains the above resins, after the fire extinguishing agent layer 12 closest to the flame is activated by the flame, when the fire extinguishing agent layer 12 located on the opposite side of the base material 14 reacts to the flame thereafter, the base material 14 melts or dissolves due to the heat of the flame (generally around 700 to 900°C), making it easier to expose the fire extinguishing agent layer 12 to the flame. Furthermore, by selecting these transparent materials, multiple fire extinguishing agent layers 12 can be easily visually inspected, making it easier to perform visual inspections of the fire extinguishing material 10 and to confirm when the fire extinguishing material 10 should be replaced. From the viewpoint of appropriately adjusting the heat insulation, heat resistance, and strength of the base material 14, the resin is preferably a polyester resin. In this case, since polyester resin has lower heat resistance and melting point compared to polyimide, glass cloth, etc., the base material 14 is more likely to melt or burn and be destroyed quickly by the heat of a fire. When the base material 14 is destroyed by fire, the fire extinguishing agent layer 12, which was previously supported by the base material 14, is completely exposed to the flames. This allows the fire extinguishing agent in the fire extinguishing agent layer 12 to react effectively, and large-scale flames can be effectively extinguished. The polyester resin is preferably polyethylene terephthalate (PET). In this case, large-scale flames can be extinguished more effectively. When the base material 14 consists of multiple layers, it is preferable that the multiple layers include layers containing the above resin, and it is more preferable that the layers consist only of layers containing the above resin.

[0049] The thickness of the base material 14 is 25 μm or more. If it is 25 μm or more, it can be appropriately adjusted according to the heat amount of the expected small flame, the impact of the extinguishing agent on the extinguishing agent layer 12, the allowable installation space for the extinguishing material package 100, etc. The thickness range of the base material 14 is preferably 200 μm or less. If the thickness of the base material 14 is 200 μm or less, in the event of a large flame, the base material 14 becomes more likely to melt or dissolve in each of the extinguishing bodies 20 contained in the extinguishing material 10, or the heat from the flame is more easily transferred simultaneously to the extinguishing agent layer 12 of each extinguishing body 20 due to the thinness of the base material 14, making it easier for multiple (all in this embodiment) extinguishing agent layers 12 to activate their extinguishing function at once, depending on the scale of the flame. For this reason, the extinguishing material 10 can extinguish even large flames. The thickness of the base material 14 may be 30 μm or more. In this case, the thermal insulation or strength of the base material 14 becomes sufficiently high, making it easier to suppress the simultaneous activation of multiple (in this embodiment, all) extinguishing agent layers 12 in the fire extinguishing material 10 in response to small flames. Furthermore, in each of the multiple small flames, heat is less likely to be transferred to the extinguishing agent layer 12 of the fire extinguishing body 20 that is located on the opposite side of the flame among the fire extinguishing bodies 20 that have activated their fire extinguishing function, making it easier to suppress the simultaneous activation of those extinguishing agent layers 12. As a result, the fire extinguishing material 10 can more reliably extinguish multiple small flames. The lower limit of the thickness of the base material 14 may be 40 μm, 45 μm, or 50 μm. By having a thickness of the base material 14 greater than or equal to the above lower limit, the fire extinguishing material 10 can more reliably extinguish multiple small flames. The upper limit of the thickness of the base material 14 may be 150 μm, 100 μm, 80 μm, or 60 μm or less. Because the thickness of the base material 14 is below the above upper limit, the fire extinguishing material 10 can effectively extinguish even large-scale flames. Furthermore, because the base material 14 is thinner, the entire fire extinguishing material 10 can be made thinner, allowing it to be installed in narrow spaces.

[0050] (3) Other layers The fire extinguishing material 10 may further include layers other than those mentioned above between the base material 14 and the fire extinguishing agent layer 12. For example, the fire extinguishing material 10 may further include a vapor-deposited layer (alumina vapor-deposited layer or silica vapor-deposited layer) having water vapor barrier properties on the base material 14, from the viewpoint of adjusting the water vapor permeability of the fire extinguishing material 10. The vapor-deposited layer may be provided on one surface of the base material 14 or on both surfaces.

[0051] <Packaging Bag> The packaging bag 50 is a bag that encloses the fire extinguishing material 10 inside. The packaging bag 50 can be obtained, for example, as shown in Figure 1, by stacking two laminates 60, which are outer packaging materials comprising a base layer 61 and a sealant layer 62, and heat-sealing the periphery of the laminates 60. Alternatively, the packaging bag 50 can also be obtained by folding a single laminate 60 comprising a base layer 61 and a sealant layer 62 and heat-sealing the overlapping periphery.

[0052] The base layer 61 provides heat resistance during the sealing process when manufacturing the packaging bag 50, and also provides the packaging bag 50 with processability and mechanical strength. The material constituting the base layer 61 can be the same resin as that used for the base material 14. If the material constituting the base layer 61 is the above-mentioned resin, it will melt or dissolve due to the heat of the flame (generally around 700 to 900°C), making it easier to expose the fire extinguishing material 10 sealed in the packaging bag 50 to the flame, and the fire extinguishing material package 100 will have good fire extinguishing function. The thickness of the base layer 61 is not particularly limited as long as it does not hinder the fire extinguishing function of the fire extinguishing material package 100, and can be, for example, within the same range as the base material 14 of the fire extinguishing body 20.

[0053] The sealant layer 62 is a layer that imparts heat-sealability to the laminate 60. Examples of resins that make up the sealant layer 62 include polyolefins (LLDPE, PP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), polyvinyl resins (PVC, PVA, etc.), acrylic resins, epoxy resins, polyamides, and polyimides. The thickness of the sealant layer 62 can be, for example, 10 μm to 100 μm.

[0054] As shown in Figure 2, the packaging bag 50 may further include a barrier layer 63. The barrier layer 63 may be placed between the base material layer 61 and the sealant layer 62. By including the barrier layer 63 in the packaging bag 50, the packaging bag 50 has gas barrier properties, and the fire extinguishing material 10 sealed inside the packaging bag 50 is less likely to be exposed to water vapor, etc., thereby suppressing deterioration of the fire extinguishing agent layer 12 constituting the fire extinguishing body 20 of the fire extinguishing material 10 due to moisture. The barrier layer may be, for example, a metal foil, a resin film with a vapor-deposited layer, or a vapor-deposited layer provided on one or both sides of the base material layer 61. Furthermore, if the laminate 60 as the outer packaging material has a barrier layer 63, large-scale flames can be extinguished more effectively. Examples of metal foil include aluminum foil and copper foil. The thickness of the metal foil may be, for example, 4.5 μm to 80 μm, or 7 μm to 12 μm. Examples of vapor-deposited layers include alumina vapor-deposited layers and silica vapor-deposited layers. The material constituting the above-mentioned resin film is the same resin as that used for the base layer 61.

[0055] In the above embodiment, an example is shown in which the fire extinguishing material 10 is contained in a packaging bag 50. However, depending on the environment in which the fire extinguishing material 10 is used, the fire extinguishing material 10 may be used as is without being sealed in a packaging bag 50.

[0056] <Method for Manufacturing Fire Extinguishing Material Packages> Next, a method for manufacturing fire extinguishing material packages 100 will be described. A method for manufacturing fire extinguishing material packages includes, for example, a fire extinguishing material preparation step of preparing the fire extinguishing material 10, and a sealing step of sealing the fire extinguishing material 10 inside a packaging bag 50.

[0057] (1) Fire extinguishing material preparation process The fire extinguishing material preparation process is a process of preparing a fire extinguishing material 10 by preparing a plurality of fire extinguishing bodies 20 and stacking these plurality of fire extinguishing bodies 20. The fire extinguishing body 20 comprises a fire extinguishing agent layer 12 and a base material 14, which can be formed, for example, by applying a fire extinguishing agent layer forming composition onto the base material 14 and drying it. Specifically, first, a fire extinguishing agent and a binder resin are mixed with a liquid medium to prepare a fire extinguishing agent layer forming composition. The amounts of the fire extinguishing agent and the binder resin should be such that they amount to 70 to 97% by mass or 85 to 92% by mass, respectively, based on the total amount of the fire extinguishing agent and binder resin in the fire extinguishing agent layer 12. The amount of the liquid medium can be appropriately adjusted according to the viscosity of the fire extinguishing agent layer forming composition, but can be such as 40 to 95% by mass, based on the total amount of the fire extinguishing agent layer forming composition. The fire extinguishing agent layer forming composition containing the liquid medium can be called a fire extinguishing agent layer forming coating liquid. Next, a coating liquid for forming a fire extinguishing agent layer is applied to the base material 14 and dried to form a fire extinguishing agent layer 12. In this way, a fire extinguishing body 20 having a fire extinguishing agent layer 12 and a base material 14 is prepared.

[0058] The coating liquid for forming the fire extinguishing agent layer can be applied by a wet coating method. Examples of wet coating methods include gravure coating, comma coating, dip coating, curtain coating, spin coating, sponge roll coating, and die coating.

[0059] The fire extinguishing material preparation step may further include a step of pressurizing the fire extinguishing agent layer 12. This makes it easier to improve the glossiness of the fire extinguishing agent layer 12. From the viewpoint of easily obtaining the desired glossiness, the pressure during pressurization can be 0.2 MPa or more, and may also be 2.0 MPa or more. From the viewpoint of the flexibility of the fire extinguishing agent layer 12, the pressure under pressurization conditions can be 2.5 MPa or less. Next, if a plurality of fire extinguishing bodies 20 obtained as described above are prepared, one is designated as the first fire extinguishing body 20A and the rest as the second fire extinguishing bodies 20B, the second fire extinguishing body 20B is laminated on top of the fire extinguishing agent layer 12 of the first fire extinguishing body 20A to obtain the fire extinguishing material 10. At this time, in the second fire extinguishing body 20B, the base material 14 is placed on the side of the first fire extinguishing body 20A. Also, at this time, the fire extinguishing bodies 20 do not have to be joined together with an adhesive or the like, or they may be joined together.

[0060] (2) Sealing process The sealing process is a process of sealing the fire extinguishing material 10 inside a packaging bag 50 to form a fire extinguishing material package 100. The packaging bag 50 can be obtained, for example, by stacking two laminates 60, each having a base material layer 61 and a sealant layer 62, and heat-sealing a portion of the peripheral edge of the laminate 60. However, the remaining peripheral edge of the laminate 60 is not heat-sealed. This remaining peripheral edge that is not heat-sealed (unsealed portion) forms an opening in the packaging bag 50. Next, the fire extinguishing material 10 is placed inside the packaging bag 50 through the opening in the packaging bag 50, and the unsealed portion of the packaging bag 50 is heat-sealed. In this way, a fire extinguishing material package 100 is obtained.

[0061] <<Electrical Equipment>> Next, an embodiment of the electrical equipment of this disclosure will be described with reference to Figure 3. Figure 3 is a schematic front view showing an embodiment of the electrical equipment of this disclosure. As shown in Figure 3, the electrical equipment 300 comprises an object to be extinguished, consisting of an electrical device 200, and a fire extinguishing material package 100.

[0062] The electrical device 200 mainly comprises an energized section 210 and a housing 220 that houses the energized section 210. The energized section 210 is the part through which electric current flows and includes a circuit breaker 203 and wiring 204. A portion of the wiring 204 is housed together in a wiring cover 202. The housing 220 comprises a box-shaped housing section 221 having an opening and an opening / closing door 222 provided in the housing section 221 for opening and closing the opening. The fire extinguishing material package 100 is housed inside the housing 220. In Figure 3, the fire extinguishing material package 100 is composed of fire extinguishing material packages 100a, 100b, 100c, and 100d. Fire extinguishing material package 100a is positioned on the opening / closing door 222 facing the energized section 210 when the opening / closing door 222 is closed. Fire extinguishing material package 100b is positioned on the inner ceiling surface of the housing section 221 facing the energized section 210. Fire extinguishing material package 100c is positioned on the lower side of the wiring cover 202 facing the energized section 210 (breaker 203) (approximate installation position shown in Figure 3 for simplicity). Fire extinguishing material package 100d is positioned on the inner back surface of the housing section 221 facing the energized section 210 (i.e., the back side of the energized section 210).

[0063] According to the electrical equipment 300, the fire extinguishing material 10 contained in the fire extinguishing material package 100 can extinguish multiple small flames. Therefore, even if multiple small flames occur in the electrical device 200, which is the object to be extinguished, and the fire extinguishing material 10 is exposed and heated by these flames, the fire extinguishing material 10 can extinguish multiple small flames.

[0064] The position in which the fire extinguishing material package 100 is placed is not limited to the position shown in Figure 3, and can be appropriately changed depending on the location of the energized part 210 of the electrical device 200 that poses a fire risk and could be the target of fire extinguishing.

[0065] The distance between the energized part 210 of the electrical device 200 and the fire extinguishing material package 100 can be adjusted as appropriate. This distance is preferably 200 mm or less, more preferably 150 mm or less, and even more preferably 120 mm or less or 100 mm or less. This allows for more effective initial fire suppression. The distance between the electrical device 200 and the fire extinguishing material package 100 refers to the shortest distance between the electrical device 200 and the fire extinguishing material package 100 that is positioned facing it. For example, for an electrical device 200 that is directly below the top surface of the housing section 221 and is 200 mm or less from the top surface, the fire extinguishing material package 100 can be placed on the top surface. Also, for example, for an electrical device 200 that is positioned facing the opening / closing door 222 and is 200 mm or less from the opening / closing door 222, the fire extinguishing material package 100 can be placed on the opening / closing door 222. It is desirable to install the fire extinguishing material package 100 close to the electrical device 200, but if they are too close there is a risk of contact between the two, so it is preferable to leave a distance of at least 1 mm between them. If the distance between the fire extinguishing material package 100 and the energized part 210 of the electrical device 200 is large, a member for adjusting the distance may be provided and the fire extinguishing material package 100 may be placed on that member.

[0066] In the above embodiment, a distribution board is used as the electrical device 200, but electrical equipment, a distribution board, or a battery (for example, a storage battery such as a lithium-ion battery) may be used instead of the distribution board as the electrical device 200. Examples of electrical equipment include equipment equipped with terminal blocks, transformers, circuit breakers, capacitors, earth leakage circuit breakers, electrical wiring, or outlets. Examples of storage batteries include mobile batteries, tool batteries, and electric vehicle batteries. In addition, in the above embodiment, the electrical equipment 300 is equipped with a fire extinguishing material package 100, but the fire extinguishing material package 100 may be replaced with fire extinguishing material 10.

[0067] The present disclosure will be further illustrated by the following examples, but the present disclosure is not limited to these examples.

[0068] The following materials were used in the examples and comparative examples.

[0069] (Composition for forming a fire extinguishing agent layer) A composition for forming a fire extinguishing agent layer (coating liquid) was obtained by mixing the following materials: Tripotassium citrate and potassium chlorate (KClO ３) Mixture with 87.4 parts by mass, ether-based polyurethane resin solution (solution obtained by dissolving 100 parts by mass of ether-based polyurethane resin in 210 parts by mass of isopropyl alcohol) 39.1 parts by mass, ethanol 87 parts by mass (Base material) Polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name: E5007, thickness 25 μm) Polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name: E7002, thickness 50 μm) Polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name: E5001, thickness 100 μm) Polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name: E5001, thickness 250 μm) Polyimide film (manufactured by UBE Corporation, product name: UPIREX®, thickness 50 μm) Glass cloth (manufactured by Unitika Ltd., product name: H25F104, thickness 50 μm) (Packaging bag)・Packaging bag 1 A rectangular laminate (outer packaging material) was made by stacking the following base layer, barrier layer and sealant layer in this order. Two of these laminates were stacked with the sealant layers facing each other, and three sides of the laminate were heat-sealed, leaving the remaining side unheat-sealed. This was designated as packaging bag 1. Base layer: polyethylene terephthalate (PET) (thickness 25 μm) Barrier layer: aluminum foil (thickness 7 μm) Sealant layer: linear low-density polyethylene (LLDPE, manufactured by Mitsui Chemicals Tohcello Co., Ltd., product name: MC-S, thickness 30 μm) ・Packaging bag 2 A packaging bag was obtained in the same manner as packaging bag 1, except that a base layer was not used, and a layer (thickness 12 μm) was used as the barrier layer, which consisted of a silica vapor-deposited layer (GL) formed on a linear low-density polyethylene film (LL). This was designated as packaging bag 2.

[0070] (Example 1) First, using an applicator, a composition for forming a fire extinguishing agent layer was applied to the surface of a substrate with a thickness of 50 μm, and dried in an oven at 75°C for 7 minutes to obtain two fire extinguishing bodies comprising a fire extinguishing agent layer and a substrate. Polyethylene terephthalate film (PET) was used as the substrate. The amount of composition for forming the fire extinguishing agent layer applied was such that the thickness after drying (thickness of the fire extinguishing agent layer) was 150 μm. Next, one of the two fire extinguishing bodies was designated as the first fire extinguishing body and the other as the second fire extinguishing body. The second fire extinguishing body (second layer) was placed on top of the fire extinguishing agent layer of the first fire extinguishing body (first layer), with the substrate positioned on the side of the first fire extinguishing body to form a fire extinguishing material. This fire extinguishing material was placed in a packaging bag 1 through an opening formed by the remaining unheat-sealed side, and the remaining side was heat-sealed to obtain a fire extinguishing material package. The dimensions of this fire extinguishing material package when viewed from above were 50 mm x 50 mm.

[0071] (Example 2) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the thickness of the base material was 100 μm as shown in Table 1.

[0072] (Example 3) A laminate was obtained in the same manner as in Example 1, except that the amount of fire extinguishing agent layer forming composition applied was such that the thickness after drying (thickness of the fire extinguishing agent layer) was 250 μm, and the thickness of the substrate was 25 μm as shown in Table 1.

[0073] (Example 4) A laminate was obtained in the same manner as in Example 1, except that the amount of fire extinguishing agent layer forming composition applied was set to an amount that resulted in a dry thickness (thickness of the fire extinguishing agent layer) of 250 μm.

[0074] (Example 5) Three fire extinguishing bodies were prepared, one of which was designated as the first fire extinguishing body and the remaining two as the second fire extinguishing bodies. The two second fire extinguishing bodies (second and third layers) were then sequentially stacked on top of the fire extinguishing agent layer of the first fire extinguishing body (first layer), with the base material of the second fire extinguishing bodies positioned on the side of the first fire extinguishing body, to produce a fire extinguishing material package in the same manner as in Example 1.

[0075] (Example 6) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the thickness of the base material was 250 μm as shown in Table 1.

[0076] (Example 7) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the base material was changed to polyimide film (PI) as shown in Table 1.

[0077] (Example 8) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the base material was changed to glass cloth (GC) as shown in Table 1.

[0078] (Example 9) A fire extinguishing material package was obtained in the same manner as in Example 1, except that packaging bag 1 was changed to packaging bag 2.

[0079] (Comparative Example 1) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the fire extinguishing material consisting only of the first fire extinguishing element was housed in a packaging bag.

[0080] (Comparative Example 2) A fire extinguishing material package was obtained in the same manner as in Example 1, except that the thickness of the base material was changed to 9 μm as shown in Table 1.

[0081] (Evaluation 1: Fire extinguishing performance against multiple small-scale fires) The fire extinguishing performance of the fire extinguishing material packages of the examples and comparative examples against multiple small-scale fires was evaluated, that is, whether they could extinguish multiple small-scale fires (i.e., whether the fire extinguishing material package could activate its fire extinguishing function multiple times against multiple small-scale fires). Specifically, a rectangular iron container measuring 20 cm in length, 30 cm in width, and 40 cm in height was prepared. The container had four side walls, one of which was provided with a glass window for observing the interior. The remaining three side walls were each provided with circular vents with a diameter of 8.5 mm at positions 5.0 cm, 12.5 cm, 20.0 cm, 27.5 cm, and 35.0 cm from the top surface to prevent the ignited solid fuel from being extinguished by suffocation. In addition, the fire extinguishing material package was attached to the center of the inner surface of the top of the container as an evaluation sample using double-sided tape. In this test, the evaluation sample was attached to the inner surface of the top of the container so that the extinguishing agent layer of the second or third layer of the extinguishing body faced the bottom of the container. A height-adjustable base was placed in the center of the bottom of the container, and a solid fuel (1.5 g, Captain Stag Fire Block igniter) measuring 15 mm in length, 15 mm in width, and 10 mm in height was placed on the base. The base was adjusted to a height where the distance between the top surface of the solid fuel and the bottom surface of the evaluation sample was 20 cm. Then, the solid fuel was ignited, and the extinguishing test was performed two or three times consecutively, observing how the solid fuel was extinguished by the evaluation sample for 180 seconds after ignition. In each extinguishing test, it was checked whether the evaluation sample could extinguish the solid fuel within 180 seconds after ignition. Note that the evaluation samples for Examples 1-4, 6-9 and Comparative Examples 1-2 were subjected to two consecutive extinguishing tests, while the evaluation sample for Example 5 was subjected to three consecutive extinguishing tests. The results are shown in Table 2. In Table 2, evaluation samples that were able to extinguish the solid fuel consecutively in two or three fire extinguishing tests are marked with "○", while evaluation samples that were unable to extinguish the solid fuel consecutively in two or three fire extinguishing tests are marked with "×".

[0082] (Evaluation 2: Fire extinguishing performance against large-scale fires) The following tests were conducted to evaluate the fire extinguishing performance (activation of fire extinguishing function) against large-scale fires of the fire extinguishing material packages obtained in the examples and comparative examples. Specifically, the fire extinguishing test was conducted in the same procedure as in Evaluation 1, except that a solid fuel measuring 50 mm in length, 50 mm in width, and 30 mm in height (50 g, "Solid Fuel Fire Block Ignition Agent" manufactured by Captain Stag Co., Ltd.) was used as the solid fuel placed on the base, instead of the solid fuel used in Evaluation 1. This test was performed three times for each evaluation sample, and the following items (1) to (3) were evaluated. The results are shown in Table 2. (1) Success rate For each evaluation sample, if the fire was extinguished within 180 seconds after ignition of the solid fuel, it was considered a "success," and the success rate (%) was calculated based on the following formula. Success rate (%) = 100 × number of successes / 3 (times) (2) Fire extinguishing time In the above fire extinguishing test, the time from ignition to confirmation of extinguishing was measured, and this was defined as the fire extinguishing time (seconds). If the fire could not be extinguished within 180 seconds after ignition, it was indicated as "-" in Table 2. If there were two or more successful tests, the average extinguishing time was recorded in Table 2. (3) Extinguishing Layer Retention Rate After the above extinguishing tests, the area of ​​the unreacted portion of the extinguishing layer remaining on the evaluation sample was measured using a metal ruler. The retention rate (%) relative to the area of ​​the extinguishing agent layer before the test was calculated based on the following formula. Table 2 shows the average value of the extinguishing layer retention rate in successful tests. Extinguishing Layer Retention Rate (%) = 100 × Total area of ​​the extinguishing agent layer remaining after the test (μm) / Total area of ​​the extinguishing agent layer before the test (μm)

[0083]

[0084]

[0085] As shown in Tables 1 and 2, the fire extinguishing material packages of Examples 1 to 9 were able to extinguish both two and three small-scale flames. On the other hand, the fire extinguishing material package of Comparative Example 1, which had only one fire extinguishing agent layer, was able to extinguish the first of two small-scale flames, but failed to extinguish the second flame, and also failed to extinguish a large-scale flame. Furthermore, the fire extinguishing material package with a base material thickness of less than 25 μm was able to extinguish the first of two small-scale flames, but failed to extinguish the second flame. From the above, it was confirmed that the fire extinguishing material packages of this disclosure can extinguish multiple small-scale flames.

[0086] This disclosure relates to the following inventions: [1] A fire extinguishing material comprising a first fire extinguishing body having a fire extinguishing agent layer, and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body, wherein the second fire extinguishing body has a fire extinguishing agent layer and a base material disposed on the side of the first fire extinguishing body that is closer to the fire extinguishing body than the fire extinguishing agent layer, the thickness of the base material is 25 μm or more, and the fire extinguishing agent layer contains a fire extinguishing agent and a binder resin. [2] The fire extinguishing material according to [1], wherein the first fire extinguishing body further has a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body that is opposite to the second fire extinguishing body. [3] The fire extinguishing material according to [1] or [2], wherein the thickness of the base material is 30 μm or more. [4] The fire extinguishing material according to any one of [1] to [3], wherein the thickness of the base material is 200 μm or less. [5] The fire extinguishing material according to [4], wherein the thickness of the base material is 90 μm or less. [6] The fire extinguishing material according to [2], wherein in the first fire extinguishing body and the second fire extinguishing body, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 2 or more. [7] The fire extinguishing material according to [6], wherein the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 15 or less. [8] The fire extinguishing material according to any one of [1] to [7], wherein the fire extinguishing agent comprises at least one of an organic salt and an inorganic salt. [9] The fire extinguishing material according to [2], wherein the base material of the first fire extinguishing body and the base material of the second fire extinguishing body both contain polyester resin.

[10] The fire extinguishing material according to [9], wherein the polyester resin is polyethylene terephthalate.

[11] A fire extinguishing material package comprising the fire extinguishing material according to any one of [1] to

[10] and a packaging bag for enclosing the fire extinguishing material.

[12] The fire extinguishing material package according to

[11] , wherein the packaging bag has an outer material, and the outer material has a barrier layer.

[13] An electrical facility comprising an object to be extinguished consisting of an electrical device and a fire extinguishing material described in any of [1] to

[10] .

[14] An electrical facility comprising an object to be extinguished consisting of an electrical device and a fire extinguishing material package described in

[11] or

[12] .

[15] A fire extinguishing material comprising: a first fire extinguishing body having a fire extinguishing agent layer; and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body, wherein the second fire extinguishing body has a fire extinguishing agent layer and a base material disposed on the side of the first fire extinguishing body that is closer to the fire extinguishing body than the fire extinguishing agent layer, the thickness of the base material is 40 μm or more and 60 μm or less, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 2 or more and 5 or less, the fire extinguishing agent layer contains a fire extinguishing agent and a binder resin, the first fire extinguishing body further has a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body that is opposite to the second fire extinguishing body, the fire extinguishing agent contains an organic salt and an oxidizing agent, the fire extinguishing agent contains potassium carboxylate, the oxidizing agent contains potassium chlorate, the binder resin contains a polyurethane resin, and both the base material of the first fire extinguishing body and the base material of the second fire extinguishing body contain polyethylene terephthalate.

[0087] According to this disclosure, a fire extinguishing material, a fire extinguishing material package, and electrical equipment capable of extinguishing multiple small-scale fires are provided.

[0088] 10...Fire extinguishing material, 12...Fire extinguishing agent layer, 14...Base material, 20...Fire extinguishing body, 20A...First fire extinguishing body, 20B...Second fire extinguishing body, 50...Packaging bag, 60...Laminate (outer material), 100...Fire extinguishing material package, 200...Electrical device, 300...Electrical equipment.

Claims

1. A fire extinguishing material comprising a first fire extinguishing body having a fire extinguishing agent layer, and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body, wherein the second fire extinguishing body has a fire extinguishing agent layer and a base material positioned on the side of the first fire extinguishing body that is closer to the fire extinguishing agent layer, the thickness of the base material being 25 μm or more, and the fire extinguishing agent layer containing a fire extinguishing agent and a binder resin.

2. The fire extinguishing material according to claim 1, wherein the first fire extinguishing body further has a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body opposite to the second fire extinguishing body.

3. The fire extinguishing material according to claim 1, wherein the thickness of the base material is 30 μm or more.

4. The fire extinguishing material according to claim 1, wherein the thickness of the base material is 200 μm or less.

5. The fire extinguishing material according to claim 4, wherein the thickness of the base material is 100 μm or less.

6. The fire extinguishing material according to claim 2, wherein in the first fire extinguishing body and the second fire extinguishing body, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 2 or more.

7. The fire extinguishing material according to claim 6, wherein the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 15 or less.

8. The fire extinguishing material according to claim 1, wherein the fire extinguishing agent comprises at least one of an organic salt and an inorganic salt.

9. The fire extinguishing material according to claim 2, wherein both the base material of the first fire extinguishing body and the base material of the second fire extinguishing body contain polyester resin.

10. The fire extinguishing material according to claim 9, wherein the polyester resin is polyethylene terephthalate.

11. A fire extinguishing material package comprising a fire extinguishing material according to any one of claims 1 to 10 and a packaging bag for enclosing the fire extinguishing material.

12. The fire extinguishing material package according to claim 11, wherein the packaging bag has an outer material, and the outer material has a barrier layer.

13. An electrical system comprising an object to be extinguished consisting of an electrical device and a fire extinguishing material according to any one of claims 1 to 10.

14. An electrical system comprising an object to be extinguished consisting of an electrical device and the fire extinguishing material package described in claim 11.

15. A fire extinguishing material comprising: a first fire extinguishing body having a fire extinguishing agent layer; and at least one second fire extinguishing body provided on top of the fire extinguishing agent layer of the first fire extinguishing body, wherein the second fire extinguishing body has a fire extinguishing agent layer and a base material disposed on the side of the first fire extinguishing body that is closer to the fire extinguishing body than the fire extinguishing agent layer, the thickness of the base material is 40 μm or more and 60 μm or less, the ratio of the thickness of the fire extinguishing agent layer to the thickness of the base material is 2 or more and 5 or less, the fire extinguishing agent layer contains a fire extinguishing agent and a binder resin, the first fire extinguishing body further has a base material on the side of the fire extinguishing agent layer of the first fire extinguishing body that is opposite to the second fire extinguishing body, the fire extinguishing agent contains an organic salt and an oxidizing agent, the fire extinguishing agent contains potassium carboxylate, the oxidizing agent contains potassium chlorate, the binder resin contains polyurethane resin, and both the base material of the first fire extinguishing body and the base material of the second fire extinguishing body contain polyethylene terephthalate.

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