Fire extinguishing body

Abstract

To provide a fire extinguishing body that can be produced with high productivity and effectively exhibits fire extinguishing performance.SOLUTION: A sheet-like fire extinguishing body has a base material layer and a fire extinguishing layer, which are layered upon one another, wherein the loop stiffness value of the fire extinguishing body is at least 50 mN and the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer is at least 80%.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a fire extinguishing body.

Background Art

[0002] Regarding the problems of ignition and fire, in Patent Document 1, it has been proposed to use a fire extinguishing liquid and a fire extinguisher. In Patent Document 2, an automatic fire extinguishing device dropped from a helicopter has been proposed. In Patent Document 3, an aerosol fire extinguishing device has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] Unlike the powdery fire extinguishing material, the fire extinguishing body exemplified in Patent Document 3 above is a molded body having a predetermined shape. In the mass production of such a fire extinguishing body which is a molded body, it is necessary to consider not only the fire extinguishing performance of the fire extinguishing body but also the processability (mass productivity) of the fire extinguishing body.

[0005] One aspect of the present disclosure aims to provide a fire extinguishing body that can be manufactured with high productivity and can exhibit good fire extinguishing performance.

Means for Solving the Problems

[0006] The inventors of the present disclosure have found that when the loop stiffness value of the fire extinguishing body is too small, problems tend to occur in the processing of the fire extinguishing body. For example, when manufacturing a sheet-shaped fire extinguishing body in a roll-to-roll manner, depending on the loop stiffness value of the fire extinguishing body, problems such as deflection of the fire extinguishing body have been found. As a countermeasure against the above-described problems, in order to improve the loop stiffness value of the fire extinguishing body, increasing the thickness of the base material layer can be mentioned. In this case, it has also been found that the fire extinguishing performance of the fire extinguishing body may be adversely affected. The fire extinguishing body according to one aspect of the present disclosure made based on the above findings is a sheet-shaped fire extinguishing body having a base material layer and a fire extinguishing layer laminated on each other, wherein the loop stiffness value of the fire extinguishing body is 50 mN or more, and the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer is 80% or more.

[0007] The value obtained by subtracting the loop stiffness value of the base material layer from the loop stiffness value of the fire extinguishing body may be 125 mN or less. In this case, cracks are less likely to occur in the fire extinguishing layer.

[0008] The fire extinguishing layer may contain a fire extinguishing agent and a binder, and the binder may contain a urethane resin. In this case, cracks are less likely to occur well in the fire extinguishing layer.

[0009] The fire extinguishing layer may contain a fire extinguishing agent and a binder, and the binder may contain a polyvinyl butyral resin and an epoxy resin. In this case, by adjusting the ratio of the polyvinyl butyral resin and the epoxy resin in the binder, the firmness strength of the fire extinguishing layer and the like can be easily adjusted.

[0010] The polyvinyl butyral resin is the main component of the binder, and the content of the epoxy resin may be 5% by mass or more and 45% by mass or less based on the total amount of the binder. In this case, cracks are less likely to occur in the fire extinguishing layer.

Advantages of the Invention

[0011] According to the present disclosure, it is possible to provide a fire extinguishing body that can be manufactured with good productivity and can exhibit good fire extinguishing performance.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments.

[0014] <Fire extinguishing body> Figure 1 is a schematic external view of a fire extinguishing device according to an embodiment. Figure 2 is a schematic cross-sectional view of a fire extinguishing device according to an embodiment, which is a cross-sectional view taken along line II-II in Figure 1. The fire extinguishing device 10 shown in Figures 1 and 2 is, for example, a sheet-like member for preventing the occurrence and spread of a fire. The fire extinguishing device 10 is provided in advance, for example, on an object that may catch fire or in the vicinity of the object. When a fire breaks out from the object, the fire extinguishing device 10 performs initial fire extinguishing according to the operation mechanism described later. Note that the object that may catch fire is, for example, electric wires, switchboards, distribution boards, control panels, storage batteries (such as lithium-ion batteries), building materials such as building wallpapers and ceiling materials, boxes for recovering lithium-ion batteries, trash cans, automobile-related members, electrical outlets, electrical outlet covers, and the like. For example, in the above object having the fire extinguishing device 10, initial fire extinguishing is automatically performed on the fire that occurs in the object. Therefore, the object having the fire extinguishing device 10 can be said to be a device having an automatic fire extinguishing function.

[0015] The fire extinguishing device 10 includes a fire extinguishing body 11 and a packaging bag 12.

[0016] The fire extinguishing body 11 is a sheet-like member that functions as a main part in the fire extinguishing device 10, and has a base material layer 1 and a fire extinguishing layer 2 that are laminated on each other. The thickness of the fire extinguishing body 11 is, for example, 50 μm or more and 500 μm or less. The thickness of the fire extinguishing body 11 may be, for example, 80 μm or more, or 110 μm or more, or 135 μm or more, or 170 μm or more, or 195 μm or more, or 220 μm or more, or 250 μm or more, or 450 μm or less, or 400 μm or less, or 350 μm or less, or 300 μm or less, or 280 μm or less, or 250 μm or less. The loop stiffness value of the fire extinguishing body 11 is, for example, 50 mN or more and 350 mN or less. In this case, cracks are less likely to occur in the fire extinguishing body 11 (particularly, the fire extinguishing layer 2 described later). The loop stiffness value may be 60 mN or more, or 75 mN or more, or 100 mN or more, or 125 mN or more, or 150 mN or more, or 300 mN or less, or 250 mN or less, or 200 mN or less, or 175 mN or less. The loop stiffness value of the fire extinguishing body 11 corresponds to the stress when the fire extinguishing body 11 is bent into a loop shape and compressed in the diameter direction of the loop. Generally, the larger the loop stiffness value of a film, the stronger the firmness of the film. The loop stiffness value of the fire extinguishing body 11 is obtained, for example, by a loop stiffness tester described in the examples described later.

[0017] (Base material layer) The base material layer 1 is a sheet-like member that serves as the base of the fire extinguishing layer 2 and is, for example, a cut piece of film. The thickness of the base material layer 1 can be appropriately selected according to the performance of the fire extinguishing device 10, the allowable size of the fire extinguishing device 10, etc. For example, if the base material layer 1 is thick, not only is it easy to obtain high strength and loop stiffness value of the fire extinguishing device 10, but it is also easy to take a highly planar form. Therefore, the thicker the base material layer 1, the easier it is to handle the fire extinguishing device 10. Also, if the base material layer 1 is thin, it becomes easy to install the fire extinguishing device 10 in a narrow space. In addition, since holes are likely to be formed in the base material layer 1 in a short time, the fire extinguishing start time can be shortened. From the above viewpoints, the thickness of the base material layer 1 may be 30 μm or more and 150 μm or less, may be 30 μm or more and 100 μm or less, may be 30 μm or more and 75 μm or less, may be 50 μm or more and 150 μm or less, may be 50 μm or more and 100 μm or less, or may be 50 μm or more and 75 μm or less.

[0018] From the viewpoint of making the loop stiffness value of the fire extinguishing body 11 50 mN or more, the loop stiffness value of the base material layer 1 needs to be increased to a certain extent. On the other hand, from the viewpoint of reducing crack generation in the fire extinguishing layer 2, the loop stiffness value of the base material layer 1 needs to be appropriately suppressed. From the above viewpoints, the value obtained by subtracting the loop stiffness value of the base material layer 1 from the loop stiffness value of the fire extinguishing body 11 is, for example, 125 mN or less. This value may be 124 mN or less, 100 mN or less, 80 mN or less, 60 mN or less, 40 mN or less, 34 mN or less, 22 mN or less, 20 mN or less, or 18 mN or less. Also, the lower limit of the value obtained by subtracting the loop stiffness value of the base material layer 1 from the loop stiffness value of the fire extinguishing body 11 is not particularly limited and may be 0 mN or more. Note that the loop stiffness value of the base material layer 1 is, for example, 30 mN or more and 300 mN or less.

[0019] As the base material layer 1, for example, a resin layer is selected. Examples of the material contained in the resin layer include polyolefin resins (such as low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), medium-density polyethylene resin (MDPE), polypropylene resin (PP), cycloolefin polymer (COP), unoriented polypropylene resin (CPP), etc.), polyester resins (such as PET), fluorine-based resins (such as PTFE, ETFE, EFEP, PFA, FEP, PCTFE), PVC, PVA, acrylic resins, epoxy resins, polyamides, polyimides, and the like. In this case, since the temperature of the flame is generally about 700°C or higher and 900°C or lower, when extinguishing the fire by the fire extinguishing device 10, a hole can be formed in the base material layer 1. The base material layer 1 may contain a fire extinguishing agent described later. The base material layer 1 may be composed of a single resin layer made of the above-described materials, or may be composed of a plurality of resin layers. The plurality of resin layers may be made of different materials. When the base material layer 1 is composed of a plurality of resin layers, the resin layers may be adhered to each other by an adhesive (adhesive layer). Examples of the adhesive include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or their synthetic adhesives, and the like. From the viewpoint of exerting the fire extinguishing performance of the fire extinguishing layer 2, the resin layer farther from the fire extinguishing layer 2 in the base material layer 1 may have a lower melting point. The material of the resin layer is, for example, a polyolefin resin.

[0020] The above resin layer may have thermomelting properties (heat sealability). A resin layer having thermomelting properties can be referred to as a thermomelting layer. The thermomelting layer is provided, for example, in a resin layer close to the fire extinguishing layer 2 in the base material layer 1. When the base material layer 1 includes a thermomelting layer, the sealing portion of the packaging bag 12 can be referred to as a heat seal portion. Examples of the resin having thermomelting properties include polyolefin resins. That is, the resin layer may contain a polyolefin resin. Examples of the polyolefin resin include not only the above-described polyolefin resins but also polyethylene resins such as ethylene-vinyl acetate copolymer and ethylene-α olefin copolymer, and polypropylene resins such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α olefin copolymer. Among these, from the viewpoints of heat sealability, water vapor permeability, etc., the polyolefin resin may include LDPE, LLDPE, or unstretched polypropylene resin (CPP). These resins have transparency. Therefore, it becomes possible to visually inspect the fire extinguishing layer 2 through the base material layer 1. Thus, it also becomes easier to confirm the replacement time of the fire extinguishing device 10, etc.

[0021] When the thermomelting layer is not provided, an adhesive can be used for bonding the resin layers included in the base material layer 1. Examples of the adhesive include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or synthetic adhesives thereof. Among these, from the viewpoints of adhesion at 85°C - 85%RH high temperature and high humidity, low cost, etc., the adhesive may be an epoxy-urethane synthetic adhesive.

[0022] The base material layer 1 may include a water vapor barrier layer. The water vapor barrier layer may be provided, for example, as an intermediate layer of the base material layer 1. When the base material layer 1 includes a water vapor barrier layer, it becomes easier to maintain a water vapor barrier property such that the properties of the fire extinguishing layer 2 do not change significantly regardless of the installation location and use environment of the fire extinguishing device 10. The water vapor permeability of the water vapor barrier layer (under the conditions of 40°C / 90%RH in accordance with JIS K 7129) is not particularly limited because it can be designed according to the type of the fire extinguishing agent contained in the fire extinguishing layer 2, but is 10 g / m 2It can be set to be below / day, and may be below 1 g / m 2 / day. From the perspective of adjusting the water vapor permeability, examples of the water vapor barrier layer include a polyester resin layer (such as a PET layer) provided with a metal oxide vapor deposition layer such as an alumina vapor deposition layer or a silica vapor deposition layer, and a metal foil such as an aluminum foil. When the water vapor barrier layer is provided with a metal oxide vapor deposition layer, the metal oxide vapor deposition layer may be provided, for example, in the vicinity of the fire extinguishing layer 2.

[0023] (Fire extinguishing layer) The fire extinguishing layer 2 is a sheet-shaped molded body of a composition (composition for forming a fire extinguishing layer) containing a fire extinguishing agent and a binder, and is provided on the base material layer 1. By molding the fire extinguishing agent using a binder, the properties of the fire extinguishing agent are easily maintained. Thereby, the replacement frequency of the fire extinguishing device 10 can be reduced. The greater the thickness of the fire extinguishing layer 2, the more likely the fire extinguishing performance of the fire extinguishing device 10 is to improve. The fire extinguishing ability exhibited by the fire extinguishing layer 2 is exerted not only on a heat source such as a flame but also on the base material layer 1 heated by the heat source. For this reason, in one embodiment, the balance between the thickness of the base material layer 1 and the thickness of the fire extinguishing layer 2 in the fire extinguishing body 11 is also considered. The ratio of the thickness of the fire extinguishing layer 2 to the thickness of the base material layer 1 is, for example, 80% or more, 120% or more, 160% or more, or 180% or more, and 400% or less, 350% or less, 300% or less, or 240% or less. Also, the thickness of the fire extinguishing layer 2 is, for example, 40 μm or more, 60 μm or more, 90 μm or more, 120 μm or more, or 150 μm or more, and 250 μm or less, 220 μm or less, 200 μm or less, or 180 μm or less. The composition for forming the fire extinguishing layer may contain a liquid medium in addition to the fire extinguishing agent and the binder.

[0024] The fire extinguishing agent can extinguish fire by generating an aerosol by combustion. The fire extinguishing agent can contain at least one of an organic salt and an inorganic salt. The organic salt and the inorganic salt may be salts having hygroscopicity.

[0025] Examples of organic salts that function as fire extinguishing agents include potassium salts, sodium salts, ammonium salts, etc. Potassium salts can be used as the organic salt. Examples of organic potassium salts include potassium carboxylate salts such as potassium acetate, potassium citrate (monopotassium citrate, dipotassium citrate, or tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate. From the perspective of the usefulness for the negative catalytic effect of combustion, the organic potassium salt may be potassium acetate or potassium citrate.

[0026] Examples of inorganic salts that function as fire extinguishing agents include, for example, potassium salts, sodium salts, etc. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium hydrogen carbonate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, etc. Among these, from the perspective of the usefulness for the negative catalytic effect of combustion, the inorganic salt may be potassium hydrogen carbonate.

[0027] The organic salt and the inorganic salt may be granular. The average particle diameter D50 of the organic salt and the inorganic salt may be 1 μm or more and 100 μm or less, or may be 3 μm or more and 40 μm or less. When the average particle diameter D50 is at least the above lower limit, it is easy to disperse in the system, and when the average particle diameter D50 is at most the above upper limit, the stability when made into a coating liquid tends to improve and the smoothness of the coated surface tends to improve. The average particle diameter D50 can be calculated by wet measurement using a laser diffraction particle size distribution measuring device.

[0028] From the perspective of promoting the generation of aerosol from the above salts with the supply of thermal energy, the fire extinguishing agent may contain a compound having an oxidizing action. Examples of the compound having an oxidizing action include chlorates such as potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, and magnesium chlorate. From the perspective of promoting aerosol generation, potassium chlorate may be used.

[0029] The content of the fire extinguishing agent contained in the fire extinguishing layer 2 may be 70% by mass or more and 97% by mass or less, or may be 85% by mass or more and 92% by mass or less, based on the solid content weight contained in the fire extinguishing layer 2. When the content of the fire extinguishing agent is 97% by mass or less, deliquescence of the salt is less likely to occur. In addition, the film-forming property of the composition for forming a fire extinguishing body can be improved. When the content of the fire extinguishing agent is 70% by mass or more, the fire extinguishing layer 2 is likely to exhibit sufficient fire extinguishing ability. The solid content weight contained in the fire extinguishing layer 2 corresponds to, for example, the total amount of the fire extinguishing agent and the binder.

[0030] The binder is a material used to mold the fire extinguishing agent. The content of the binder contained in the fire extinguishing layer 2 may be 2% by mass or more and 20% by mass or less, or may be 4% by mass or more and 15% by mass or less, based on the solid content weight contained in the fire extinguishing layer 2. When the content of the binder is 20% by mass or less, the surface smoothness of the coating film after drying tends to be improved. When the content of the binder is 2% by mass or more, the roll-to-roll coating suitability when applying the fire extinguishing layer 2 is likely to be improved.

[0031] As the binder, a thermoplastic resin and a thermosetting resin can be used. Examples of the thermoplastic resin include polyolefin resins such as polypropylene-based resins, polyethylene-based resins, polybutene-based resins, and polypentene-based resins; polystyrene-based resins; acrylonitrile-butadiene-styrene-based resins; methyl methacrylate-butadiene-styrene-based resins; ethylene-vinyl acetate resins; ethylene-propylene resins; polycarbonate-based resins; polyphenylene ether-based resins; acrylic resins; polyamide-based resins; polyvinyl chloride-based resins; polyvinyl alcohol resins (PVA); polyvinyl butyral resins (PVB); and the like. Examples of the thermosetting resin include 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), multi-vulcanized rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U); urethane-based resins; phenolic resins; epoxy resins; polyvinyl ether (PMVE)-maleic anhydride resins; and the like. The binder may contain one of the above resins or a plurality of them. The binder may contain a curing agent component. From the viewpoint of property stability, the binder may contain optional additives such as surfactants, silane coupling agents, and anti-blocking agents.

[0032] From the perspective of the flexibility of the fire extinguishing device 10, etc., the binder may contain a urethane resin, or may contain a polyvinyl butyral resin and an epoxy resin. From the perspective of reducing crack generation in the fire extinguishing layer 2, etc., the main component of the binder may be a urethane resin. When the binder contains a urethane resin, the content of the urethane resin may be 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, or 100% by mass based on the total amount of the binder. When the binder contains a polyvinyl butyral resin and an epoxy resin, from the perspective of the workability of the fire extinguishing body 11, etc., the polyvinyl butyral resin may be the main component of the binder. In this case, the content of the epoxy resin is, for example, 5% by mass or more and 45% by mass or less based on the total amount of the binder. The content of the epoxy resin may be, for example, 8% by mass or more, 15% by mass or more, 20% by mass or more, 40% by mass or less, 30% by mass or less, or 25% by mass or less based on the total amount of the binder.

[0033] Examples of the liquid medium include organic solvents. Examples of the organic solvent include water-soluble solvents, such as alcohols like methanol, ethanol, isopropyl alcohol, and n-propyl alcohol; ketones like acetone and methyl ethyl ketone; glycols like ethylene glycol and diethylene glycol; glycol ethers like N-methylpyrrolidone, tetrahydrofuran, and butyl cellosolve. The liquid medium may contain one of the above solvents or a plurality of them. From the perspective of being used together with the salt, the liquid medium may be an alcohol-based solvent such as ethanol. The amount of the liquid medium is not particularly limited, but can be 30% by mass or more and 70% by mass or less based on the total amount of the fire extinguishing layer 2.

[0034] The fire extinguishing layer 2 may contain other components including at least one of a surfactant, a silane coupling agent, an anti-blocking agent, a coloring agent, an antioxidant, a flame retardant, an inorganic filler, a fluidity-imparting agent, a moisture-proof agent, a dispersant, a UV absorber, a flexibility-imparting agent, and a catalyst. These other components can be appropriately selected depending on the type of the fire extinguishing agent, binder, or liquid medium, etc. The content of the other components contained in the fire extinguishing layer 2 is, for example, 10% by mass or less based on the total amount of the fire extinguishing layer 2.

[0035] An example of the method for manufacturing the fire extinguishing body 11 is as follows. First, a coating liquid of a composition for forming a fire extinguishing body containing a fire extinguishing agent, a binder, and a liquid medium is applied onto the surface to be treated of the base material layer 1. Subsequently, the coating liquid is dried. Thereby, the fire extinguishing layer 2 is formed on the base material layer 1. The application of the composition for forming a fire extinguishing body can be performed, for example, by a wet coating method. Examples of the wet coating method include a gravure coating method, a comma coating method, a spray coating method, a dip coating method, a curtain coating method, a spin coating method, a sponge roll method, a die coating method, coating with a brush, etc.

[0036] (Packaging bag) The packaging bag 12 is a bag-shaped member used to maintain the performance of the fire extinguishing layer 2 over a long period. The packaging bag 12 is formed, for example, by heat-sealing the four sides of two resin films. Examples of the resin constituting the resin film include polyolefin resins (LLDPE, PP, COP, CPP, etc.), polyester resins (PET, etc.), fluorine resins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, polyimides, etc. The resin film may be composed of one of the above resins or a combination of two or more. With these resins, they can be melted by the heat of fire (generally about 700 °C to 900 °C), making it easy to expose the internal base material layer 1 and fire extinguishing layer 2. Further, the above fire extinguishing agent may be contained in the resin film. By selecting a transparent material as the resin, the base material layer 1 and the fire extinguishing layer 2 can be visually recognized through the packaging bag 12. Also, figures, patterns, characters, colors, etc. may be printed on at least a part of the packaging bag 12. From the viewpoint of maintaining the aesthetics of the packaging bag 12, the fire extinguishing layer 2 of the fire extinguishing body 11 may contain a urethane resin as a binder. Or, when the fire extinguishing layer 2 contains a polyvinyl butyral resin and an epoxy resin, the proportion of the content of the epoxy resin to the total amount of the binder may be, for example, 20% by mass or more.

[0037] The water vapor transmission rate of the resin film (under the conditions of JIS K 7129 compliance, 40 °C / 90% RH) is designed according to the type of the fire extinguishing body 20. For example, the water vapor transmission rate of the resin film is 10.0 g / m 2 / day or less or 1.0 g / m 2 / day or less. From the viewpoint of adjusting the water vapor transmission rate, a vapor deposition layer (alumina vapor deposition layer or silica vapor deposition layer) having a water vapor barrier property may be provided on the resin film.

[0038] Hereinafter, the operation and effect of the fire extinguishing device 10 according to the above-described embodiment will be described. First, from the perspective of mass productivity, it is considered that the fire extinguishing body 11 included in the fire extinguishing device 10 according to an embodiment is manufactured, for example, by a roll-to-roll method. In such a case, after a dried product of the fire extinguishing body-forming composition is formed on the film unwound from the roll, cutting process is performed on the film. Thereby, the fire extinguishing body 11 having the base material layer 1 and the fire extinguishing layer 2 cut out to a predetermined size is formed. Here, during the production of the fire extinguishing body 11 by the roll-to-roll method, depending on the loop stiffness value of the fire extinguishing body 11, the film on which the above dried product is formed may be deflected. When such deflection occurs, the film may be cut inappropriately. As a result, there is a concern that the dimensional accuracy of the fire extinguishing body 11 after cutting varies.

[0039] Regarding such a concern, the loop stiffness value of the fire extinguishing body 11 according to an embodiment is 50 mN or more. Thereby, even when the fire extinguishing body 11 is manufactured by a manufacturing method in which cutting process of a film such as a roll-to-roll method is performed, the deflection of the film is less likely to occur. For this reason, the variation in the dimensional accuracy of the fire extinguishing body 11 after cutting can be suppressed. Therefore, the fire extinguishing body 11 can be manufactured by a method with high mass productivity. For example, the thicker the base material layer 1 is, the easier it is for the base material layer 1 itself to be heated, and melting of the base material layer 1 itself, combustion of the base material layer 1 itself, etc. may occur. In the former case, the heat absorption accompanying the melting of the base material layer 1 may inhibit the propagation of the thermal energy of the fire extinguishing agent, and the fire extinguishing performance of the fire extinguishing layer 2 may not be exhibited well. In the latter case, the fire extinguishing layer 2 extinguishes not only the fire source but also the base material layer 1, and a problem may occur in that the extinguishing of the fire source becomes insufficient. From the perspective of suppressing the occurrence of such problems, the ratio of the thickness of the fire extinguishing layer 2 to the thickness of the base material layer 1 is 80% or more. Thereby, the adverse effect on the fire extinguishing performance of the fire extinguishing layer 2 by the base material layer 1 can be suppressed. Therefore, according to an embodiment, a fire extinguishing body 11 capable of exhibiting good fire extinguishing performance can be manufactured with high productivity.

[0040] In one embodiment, the value obtained by subtracting the loop stiffness value of the base material layer 1 from the loop stiffness value of the fire extinguishing body 11 is 125 mN or less. In this case, cracks are less likely to occur in the fire extinguishing layer 2. Thereby, it is possible to suppress a loss of the appearance of the fire extinguishing body 11 associated with the occurrence of such cracks.

[0041] In one embodiment, the fire extinguishing layer 2 may contain a fire extinguishing agent and a binder, and the binder may contain a urethane resin. In this case, the occurrence of cracks in the fire extinguishing layer 2 can be favorably suppressed. Therefore, it is possible to realize an improvement in the fire extinguishing performance of the fire extinguishing body 11 accompanying the thickening of the fire extinguishing layer 2.

[0042] In one embodiment, the fire extinguishing layer 2 may contain a fire extinguishing agent and a binder, and the binder may contain a polyvinyl butyral resin and an epoxy resin. In this case, by adjusting the ratio of the polyvinyl butyral resin and the epoxy resin in the binder, the firmness of the fire extinguishing layer 2 and the like can be easily adjusted.

[0043] In one embodiment, the content of the epoxy resin may be 5% by mass or more and 45% by mass or less based on the total amount of the binder. In this case, cracks are less likely to occur in the fire extinguishing layer 2.

[0044] In one embodiment, the fire extinguishing device 10 includes a fire extinguishing body 11 and a packaging bag 12 that encloses the fire extinguishing body 11. In this case, since the fire extinguishing body 11 is enclosed in the packaging bag 12, even when the fire extinguishing agent has deliquescence, deterioration of the fire extinguishing agent can be suppressed. For this reason, the fire extinguishing body 11 can exhibit its fire extinguishing performance over a long period of time.

[0045] The fire extinguishing body according to one aspect of the present disclosure is as described in [1] to [5] below. Hereinafter, these will be described in detail based on the above embodiment. [1] A sheet-shaped fire extinguishing body having a base material layer and a fire extinguishing layer laminated on each other, wherein the loop stiffness value of the fire extinguishing body is 50 mN or more, and the thickness of the fire extinguishing layer with respect to the thickness of the base material layer is 80% or more. [2] The fire extinguishing body according to [1], wherein the value obtained by subtracting the loop Stefness value of the base material layer from the loop Stefness value of the fire extinguishing body is 125 mN or less. [3] The fire extinguishing body according to [1] or [2], wherein the fire extinguishing layer contains a fire extinguishing agent and a binder, and the binder contains a urethane resin. [4] The fire extinguishing body according to [1] or [2], wherein the fire extinguishing layer contains a fire extinguishing agent and a binder, and the binder contains a polyvinyl butyral resin and an epoxy resin. [5] The fire extinguishing body according to [4], wherein the polyvinyl butyral resin is the main component of the binder, and the content of the epoxy resin is 5% by mass or more and 45% by mass or less based on the total amount of the binder.

[0046] However, one aspect of the present disclosure is not limited to the above-described embodiments and [1] to [5]. One aspect of the present disclosure can be further modified without departing from the gist thereof. For example, in the above-described embodiment, the fire extinguishing body has one fire extinguishing layer, but the present disclosure is not limited thereto. For example, the fire extinguishing body may have two or more fire extinguishing layers. In this case, for example, fire extinguishing layers may be provided on both sides of the base material layer.

Examples

[0047] Hereinafter, the present disclosure will be described more specifically based on examples, but the present disclosure is not limited to the following examples.

[0048] <Formation of fire extinguishing body> (Example 1) First, a fire extinguishing body-forming composition was prepared by mixing the following materials in the following mixing ratios as a fire extinguishing agent. · Fire extinguishing agent component: 87 parts by mass of a mixture of potassium chlorate and tripotassium citrate · First binder: 73 parts by mass of a polyvinyl butyral resin solution (a solution obtained by dissolving 11 parts by mass of a polyvinyl butyral resin in 80 parts by mass of ethanol and 9 parts by mass of isopropyl alcohol) · Second binder: 5 parts by mass of an epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) · 87 parts by mass of ethanol The mixture of potassium chlorate and tripotassium citrate, which is a deliquescent salt, was ground in an agate mortar and then filtered through an 800-mesh sieve. After adjusting the particle size to D50 = 12 μm, it was mixed.

[0049] On one surface of a base material layer made of polyethylene terephthalate (PET) with a thickness of 50 μm (product name: E7002, manufactured by Toyobo Co., Ltd.), the above fire extinguishing body-forming composition was applied using an applicator so that the thickness of the dried fire extinguishing layer would be 120 μm, and then dried in an oven at 75°C for 7 minutes. Thereby, a sheet-like fire extinguishing layer was formed on the surface of the base material layer, and a fire extinguishing body was obtained.

[0050] (Example 2) A fire extinguishing material was obtained in the same manner as in Example 1, except that various materials were prepared as follows and the fire extinguishing body-forming composition was applied onto the surface of the base material layer so that the thickness of the dried fire extinguishing layer would be 90 μm. · Blowing agent component: 87 parts by mass of a mixture of potassium chlorate and tripotassium citrate · Binder: 41 parts by mass of an ether-based polyurethane resin solution (a solution obtained by dissolving 100 parts by mass of an ether-based polyurethane resin in 210 parts by mass of isopropyl alcohol) · 87 parts by mass of ethanol

[0051] (Example 3) A fire extinguishing body was produced in the same manner as in Example 2, except that the fire extinguishing body-forming composition was applied onto the surface of the base material layer so that the thickness of the dried fire extinguishing layer would be 120 μm.

[0052] (Example 4) A fire extinguishing body was produced in the same manner as in Example 2, except that the fire extinguishing body-forming composition was applied onto the surface of the base material layer so that the thickness of the dried fire extinguishing layer would be 200 μm.

[0053] (Example 5) A fire extinguishing material was obtained in the same manner as in Example 1, except that various materials were prepared as follows. · Digestant component: 87 parts by mass of a mixture of potassium chlorate and tripotassium citrate · Binder: 118 parts by mass of a polyvinyl butyral resin solution (a solution prepared by dissolving 11 parts by mass of polyvinyl butyral resin in 80 parts by mass of ethanol and 9 parts by mass of isopropyl alcohol) · Ethanol 87 parts by mass

[0054] (Example 6) A fire extinguishing material was obtained in the same manner as in Example 1, except that various materials were prepared as follows. · Digestant component: 87 parts by mass of a mixture of potassium chlorate and tripotassium citrate · First binder: 109 parts by mass of a polyvinyl butyral resin solution (a solution prepared by dissolving 11 parts by mass of polyvinyl butyral resin in 80 parts by mass of ethanol and 9 parts by mass of isopropyl alcohol) · Second binder: 1 part by mass of an epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) · Ethanol 87 parts by mass

[0055] (Example 7) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 75 μm and the fire extinguishing layer forming composition was applied onto the surface of the base material layer so that the thickness of the fire extinguishing layer after drying was 60 μm.

[0056] (Example 8) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 75 μm.

[0057] (Example 9) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 100 μm.

[0058] (Comparative Example 1) A fire extinguishing body was produced in the same manner as in Example 2, except that the fire extinguishing layer forming composition was applied onto the surface of the base material layer so that the thickness of the fire extinguishing layer after drying was 60 μm.

[0059] (Comparative Example 2) A fire extinguishing material was obtained in the same manner as in Example 1, except that various materials were prepared as follows. · Blowing agent component: 87 parts by mass of a mixture of potassium chlorate and tripotassium citrate · First binder: 36 parts by mass of a polyvinyl butyral resin solution (a solution prepared by dissolving 11 parts by mass of polyvinyl butyral resin in 80 parts by mass of ethanol and 9 parts by mass of isopropyl alcohol) · Second binder: 9 parts by mass of an epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) · 87 parts by mass of ethanol

[0060] (Comparative Example 3) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 25 μm and the fire extinguishing layer forming composition was applied onto the surface of the base material layer so that the thickness of the fire extinguishing layer after drying was 60 μm.

[0061] (Comparative Example 4) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 25 μm.

[0062] (Comparative Example 5) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 100 μm and the fire extinguishing layer forming composition was applied onto the surface of the base material layer so that the thickness of the fire extinguishing layer after drying was 60 μm.

[0063] (Comparative Example 6) A fire extinguishing body was produced in the same manner as in Example 1, except that the thickness of the base material layer was 250 μm and the fire extinguishing layer forming composition was applied onto the surface of the base material layer so that the thickness of the fire extinguishing layer after drying was 30 μm.

[0064] (Measurement method of loop Stefnes value) The loop stiffness value was measured using a loop stiffness tester DA-S manufactured by Toyo Seiki Seisaku-sho, Ltd. Specifically, the loop stiffness value was measured as follows. First, a test film with a width of 15 mm and a length of 200 mm was prepared. Next, loops with a loop length of 85 mm were formed by fixing both ends of the test film with chucks, and these loops were compressed by a pressure head under the conditions of a compression speed of 3.3 mm / min, a compression time of 3 seconds, and a compression distance of 20 mm, and the load of the pressure head at that time was measured. As the loop stiffness value, the maximum value of the load measured in this test was adopted. Note that the compression distance represents the distance when the pressure head and the chuck are closest to each other. Table 1 and Table 2 show the loop stiffness values measured for the base material layers and the fire extinguishing bodies in Examples 1 to 9 and Comparative Examples 1 to 6.

[0065] <Enclosure of the fire extinguishing body> A barrier film comprising a sealant layer (L-LDPE (linear low-density polyethylene) resin, thickness 30 μm) and a base material layer (PET resin having a silica vapor deposition film, thickness 12 μm) was prepared. The water vapor transmission rate of the barrier film was 0.2 to 0.6 g / m 2 / day (under the conditions of 40 °C / 90% RH). Using two of these barrier films, a sheet-shaped fire extinguishing body was covered, and the four sides of the barrier film were heat-sealed to produce a fire extinguishing device as an evaluation sample. The heat-sealing conditions were 140 °C for 2 seconds.

[0066] The following evaluations were performed on the evaluation samples in Examples 1 to 9 and Comparative Examples 1 to 6 obtained by the above method.

[0067] <Fire extinguishing property test> An iron container with a length of 20 cm, a width of 30 cm, and a height of 40 cm was prepared. On each side of the container, circular vents with a diameter of 8.5 mm were provided at a position 5 cm away from the top surface in the height direction. Similarly, circular vents with a diameter of 8.5 mm were also provided on each side of the container at positions 12.5 cm away from the top surface in the height direction, 20.0 cm away from the top surface in the height direction, 27.5 cm away from the top surface in the height direction, and 35.0 cm away from the top surface in the height direction. In the center of the top surface of the container, a fire extinguishing body with an area of 50 mm × 50 mm was attached with double-sided tape. 1.5 g of solid fuel (solid fuel fire block igniter manufactured by Captain Stag Co., Ltd.) with a length of 15 mm, a width of 15 mm, and a height of 10 mm was placed in the container so that the distance from the fire extinguishing body in the height direction was 8 cm. At this time, the fire extinguishing body and the solid fuel were overlapped in the height direction. When the solid fuel was ignited, an evaluation was made as to whether the fire extinguishing material could extinguish the fire within 180 seconds after the ignition of the solid fuel. The evaluation was conducted based on the following criteria. The evaluation results are shown in Tables 1 and 2. A: The fire extinguishing body extinguished the solid fuel within 180 seconds after the ignition of the solid fuel. B: The fire extinguishing body could not extinguish the solid fuel within 180 seconds after the ignition of the solid fuel.

[0068] <Evaluation of processing suitability> Using an arbitrary cutting machine, cutting was performed at a feed rate of 190 mm every 5 m / min at a speed of 5 m / min. The evaluation was conducted based on the following criteria. The evaluation results are shown in Tables 1 and 2. A: The sheet-shaped fire extinguishing body was conveyed without bending. B: The cut sheet-shaped fire extinguishing body was bent, and there was variation in the dimensional accuracy of the fire extinguishing body after cutting.

[0069] <Evaluation of cracks> After forming the fire extinguishing body, it was visually confirmed whether cracks occurred on the surface of the fire extinguishing layer. The evaluation was conducted based on the following criteria. The evaluation results are shown in Tables 1 and 2. A: No cracks occurred on the surface of the fire extinguishing layer. B: The maximum width of the cracks generated on the surface of the fire extinguishing layer was less than 3 mm. C: The maximum width of the crack generated on the surface of the fire extinguishing layer is 3 mm or more.

[0070]

Table 1

[0071]

Table 2

[0072] In Examples 1 to 9, the fire extinguishing bodies had excellent fire extinguishing performance and processability because the loop stiffness value of the fire extinguishing body was 50 mN or more and the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer was 80% or more. In Example 7, it was calculated that the value obtained by subtracting the loop stiffness value of the base material layer from the loop stiffness value of the fire extinguishing body was 0 mN. However, such a calculation result (measurement error) can be obtained when the loop stiffness value of the base material layer is dominant in the loop stiffness value of the fire extinguishing body. Therefore, the loop stiffness value of the fire extinguishing body excluding the base material layer is not necessarily actually 0 mN. Also, in the fire extinguishing body of Example 5, cracks occurred on the surface of the fire extinguishing layer, but the influence of the cracks on the fire extinguishing performance and processability of the fire extinguishing body was almost negligible.

[0073] On the other hand, in Comparative Examples 1 to 4, the fire extinguishing bodies had poor processability because the loop stiffness value of the fire extinguishing body was less than 50 mN, and in Comparative Examples 5 to 6, the fire extinguishing performance was not excellent because the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer was less than 80%.

Explanation of Signs

[0074] 1... Base material layer, 2... Fire extinguishing layer, 10... Fire extinguishing device, 11... Fire extinguishing body, 12... Packaging bag.

Claims

1. A sheet-shaped fire extinguishing body having a base material layer and a fire extinguishing layer laminated on each other, wherein the loop stiffness value of the fire extinguishing body is 50 mN or more, and the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer is 80% or more.

2. The fire extinguishing body according to claim 1, wherein the value obtained by subtracting the loop stiffness value of the base material layer from the loop stiffness value of the fire extinguishing body is 125 mN or less.

3. The fire extinguishing layer contains a fire extinguishing agent and a binder, and the binder contains a urethane resin. The fire extinguishing body according to claim 1 or 2.

4. The fire extinguishing layer contains a fire extinguishing agent and a binder, and the binder contains a polyvinyl butyral resin and an epoxy resin. The fire extinguishing body according to claim 1 or 2.

5. The polyvinyl butyral resin is the main component of the binder, and the content of the epoxy resin is 5% by mass or more and 45% by mass or less based on the total amount of the binder. The fire extinguishing body according to claim 4.

Images