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 fire suppression bodies. [Background technology]

[0002] To address the problem of ignition and fire, Patent Document 1 proposes the use of fire extinguishing liquid and a fire extinguisher. Patent Document 2 proposes an automatic fire extinguishing device dropped from a helicopter. Patent Document 3 proposes an aerosol fire extinguishing device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-276440 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-6302 [Patent Document 3] Japanese Patent Application Publication No. 2017-080023 Summary of the Invention [Problem to be solved by the invention]

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

[0005] An object of one aspect of the present disclosure is to provide a fire extinguishing body that can be manufactured with high productivity and that can exhibit good fire extinguishing performance. [Means for solving the problem]

[0006] The inventors of the present disclosure have found that if the loop stiffness value of a fire extinguisher is too small, problems tend to occur during processing of the fire extinguisher. For example, when a sheet-shaped fire extinguisher is manufactured using a roll-to-roll method, a problem has been found in that the fire extinguisher may sag depending on the loop stiffness value of the fire extinguisher. One solution to this problem is to thicken the base layer to improve the loop stiffness value of the fire extinguisher. It has also been found that this can adversely affect the fire extinguishing performance of the fire extinguisher. Based on the above findings, one aspect of the present disclosure provides a sheet-shaped fire extinguisher having a base layer and a fire extinguishing layer stacked together, wherein the loop stiffness value of the fire extinguisher is 50 mN or more, and the ratio of the thickness of the fire extinguishing layer to the thickness of the base layer is 80% or more.

[0007] The value obtained by subtracting the loop stiffness value of the base layer from the loop stiffness value of the fire-extinguishing body may be 125 mN or less, in which 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, which makes it more difficult for cracks to occur in the fire-extinguishing layer.

[0009] The fire-extinguishing layer may contain a fire-extinguishing agent and a binder, and the binder may contain polyvinyl butyral resin and epoxy resin. In this case, the stiffness and other properties of the fire-extinguishing layer can be easily adjusted by adjusting the ratio of polyvinyl butyral resin to epoxy resin in the binder.

[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, which makes it difficult for cracks to occur in the fire-extinguishing layer. [Effects of the Invention]

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

[0012] [Figure 1] FIG. 1 is a schematic external view of a fire extinguisher according to one embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of a fire extinguisher according to one embodiment, taken along line II-II in FIG. DETAILED DESCRIPTION OF THE INVENTION

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

[0014] <Fire extinguishing body> FIG. 1 is a schematic external view of a fire extinguisher according to one embodiment. FIG. 2 is a schematic cross-sectional view of a fire extinguisher according to one embodiment, taken along line II-II in FIG. 1. The fire extinguisher 10 shown in FIGS. 1 and 2 is, for example, a sheet-like member for preventing the outbreak and spread of a fire. The fire extinguisher 10 is installed in advance, for example, on or near an object that may catch fire. In the event of a fire breaking out in the object, the fire extinguisher 10 performs initial fire extinguishing according to the mechanism of action described below. Examples of objects that may catch fire include electrical wires, distribution boards, control panels, storage batteries (lithium ion batteries, etc.), building materials such as wallpaper for building materials and ceiling materials, lithium ion battery recycling boxes, trash cans, automobile-related components, electrical outlets, and outlet covers. For example, in the above-mentioned object equipped with the fire extinguisher 10, initial fire extinguishing is automatically performed in the event of a fire breaking out in the object. Therefore, the object equipped with the fire extinguisher 10 can be said to have an automatic fire extinguishing function.

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

[0016] The fire extinguishing element 11 is a sheet-like member that functions as a main part of the fire extinguishing device 10, and includes a base layer 1 and a fire extinguishing layer 2 that are laminated together. The thickness of the fire extinguishing element 11 is, for example, 50 μm or more and 500 μm or less. The thickness of the fire extinguishing element 11 may be, for example, 80 μm or more, 110 μm or more, 135 μm or more, 170 μm or more, 195 μm or more, 220 μm or more, 250 μm or more, 450 μm or less, 400 μm or less, 350 μm or less, 300 μm or less, 280 μm or less, or 250 μm or less. The loop stiffness value of the fire extinguishing element 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 element 11 (especially the fire extinguishing layer 2, which will be described later). The loop stiffness value may be 60 mN or more, 75 mN or more, 100 mN or more, 125 mN or more, 150 mN or more, 300 mN or less, 250 mN or less, 200 mN or less, or 175 mN or less. The loop stiffness value of the fire extinguisher 11 corresponds to the stress when the fire extinguisher 11 is bent into a loop shape and compressed in the diameter direction of the loop. Generally, the higher the loop stiffness value of a film, the stronger the stiffness of the film. The loop stiffness value of the fire extinguisher 11 can be obtained, for example, using a loop stiffness tester described in the examples below.

[0017] (base material layer) The base layer 1 is a sheet-like member that serves as the base for the fire extinguishing layer 2, and is, for example, a cut piece of film. The thickness of the base layer 1 can be appropriately selected depending on the performance and allowable size of the fire extinguisher 10. For example, a thicker base layer 1 not only facilitates the fire extinguisher 10 to have high strength and loop stiffness, but also facilitates a highly flat configuration. Therefore, the thicker the base layer 1, the easier it is to handle the fire extinguisher 10. Furthermore, a thinner base layer 1 facilitates the installation of the fire extinguisher 10 in a narrow space. In addition, holes are more likely to be drilled in the base layer 1 in a short time, thereby shortening the time required to start extinguishing a fire. From the above perspectives, the thickness of the base layer 1 may be 30 μm to 150 μm, 30 μm to 100 μm, 30 μm to 75 μm, 50 μm to 150 μm, 50 μm to 100 μm, or 50 μm to 75 μm.

[0018] In order to ensure that the loop stiffness value of the fire extinguishing element 11 is 50 mN or more, the loop stiffness value of the base material layer 1 needs to be relatively large. On the other hand, in order to reduce cracking in the fire extinguishing layer 2, the loop stiffness value of the base material layer 1 needs to be moderately suppressed. From these perspectives, the value obtained by subtracting the loop stiffness value of the base material layer 1 from the loop stiffness value of the fire extinguishing element 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. 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 element 11 is not particularly limited, and may be 0 mN or more. The loop stiffness value of the base material layer 1 is, for example, 30 mN or more and 300 mN or less.

[0019] For example, a resin layer is selected as the base layer 1. Examples of materials contained in the resin layer include polyolefin resins (low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), medium-density polyethylene resin (MDPE), polypropylene resin (PP), cycloolefin polymer (COP), unstretched polypropylene resin (CPP), etc.), polyester resins (PET, etc.), fluorine-based resins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamide, and polyimide. In this case, since the temperature of a flame is generally about 700°C or higher and 900°C or lower, holes can be made in the base layer 1 when the fire is extinguished by the fire extinguisher 10. The base layer 1 may contain a fire extinguishing agent, which will be described later. The base layer 1 may be composed of one resin layer made of the above-mentioned material, or may be composed of multiple resin layers. The multiple resin layers may each be made of a different material. When the base material layer 1 is composed of multiple resin layers, the resin layers may be bonded together with an adhesive (adhesive layer). Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, and synthetic adhesives thereof. From the viewpoint of ensuring the fire extinguishing performance of the fire extinguishing layer 2, the resin layers in the base material layer 1 farther from the fire extinguishing layer 2 may have lower melting points. The material of the resin layers is, for example, a polyolefin resin.

[0020] The resin layer described above may have heat-melt properties (thermal adhesiveness). A resin layer having heat-melt properties can be referred to as a heat-melt layer. The heat-melt layer is provided, for example, in a resin layer of the base layer 1 that is close to the fire-extinguishing layer 2. When the base layer 1 has a heat-melt layer, the sealed portion of the packaging bag 12 can be referred to as a heat-sealed portion. Examples of heat-melt resins include polyolefin-based resins. That is, the resin layer may contain a polyolefin-based resin. Examples of polyolefin-based resins include not only the polyolefin-based resins described above, but also polyethylene-based resins such as ethylene-vinyl acetate copolymers and ethylene-α-olefin copolymers, and polypropylene-based resins such as propylene-ethylene random copolymers, propylene-ethylene block copolymers, and propylene-α-olefin copolymers. Among these, from the viewpoints of heat-sealability and water vapor permeability, the polyolefin-based resin may include LDPE, LLDPE, or unstretched polypropylene resin (CPP). These resins are transparent. This allows for visual inspection of the fire-extinguishing layer 2 through the base layer 1. Therefore, it becomes easy to check when the fire extinguisher 10 should be replaced.

[0021] When no heat-melting layer is provided, an adhesive can be used to bond the resin layers included in the base layer 1. Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, and synthetic adhesives thereof. Among these, an epoxy-urethane synthetic adhesive may be used as the adhesive from the viewpoints of adhesion at high temperatures and high humidity of 85°C-85%RH, low cost, etc.

[0022] The base 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 layer 1. When the base layer 1 includes a water vapor barrier layer, it becomes easier to maintain water vapor barrier properties to the extent that the properties of the fire extinguishing layer 2 do not change significantly, regardless of the installation location or usage environment of the fire extinguishing device 10. The water vapor permeability of the water vapor barrier layer (under conditions of 40°C / 90% RH in accordance with JIS K 7129) is not particularly limited, as it can be designed depending on the type of fire extinguishing agent contained in the fire extinguishing layer 2, but is preferably 10 g / m 2 / day or less, and 2 / day or less. From the viewpoint of adjusting the water vapor permeability, examples of the water vapor barrier layer include a polyester resin layer (e.g., a PET layer) provided with a metal oxide vapor-deposited layer such as an alumina vapor-deposited layer or a silica vapor-deposited layer, and a metal foil such as aluminum foil. When the water vapor barrier layer includes a metal oxide vapor-deposited layer, the metal oxide vapor-deposited layer may be provided, for example, near the fire-extinguishing layer 2.

[0023] (Fire extinguishing layer) The fire extinguishing layer 2 is a sheet-like molded body of a composition (fire extinguishing layer-forming composition) containing a fire extinguishing agent and a binder, and is provided on the base layer 1. Forming the fire extinguishing agent using a binder helps maintain the properties of the fire extinguishing agent. This reduces the frequency of replacing the fire extinguishing device 10. The thicker the fire extinguishing layer 2, the better the fire extinguishing performance of the fire extinguishing device 10 tends to be. The fire extinguishing ability exerted by the fire extinguishing layer 2 is exerted not only on heat sources such as flames, but also on the base layer 1 heated by the heat source. For this reason, in one embodiment, the balance between the thickness of the base layer 1 and the thickness of the fire extinguishing layer 2 in the fire extinguishing element 11 is also taken into consideration. The ratio of the thickness of the fire extinguishing layer 2 to the thickness of the base 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. 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 a 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 a fire by generating an aerosol upon combustion. The fire extinguishing agent can contain at least one salt of an organic salt and an inorganic salt. The organic salt and the inorganic salt may be a hygroscopic salt.

[0025] Examples of organic salts that function as fire extinguishing agents include potassium salts, sodium salts, and ammonium salts. Potassium salts can be used as the organic salt. Examples of organic potassium salts include potassium carboxylates such as potassium acetate, potassium citrate (monopotassium citrate, dipotassium citrate, or tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate. From the viewpoint of usefulness against 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 potassium salts, sodium salts, etc. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium bicarbonate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, etc. Among these, the inorganic salt may be potassium bicarbonate from the viewpoint of its usefulness in the negative catalytic effect of combustion.

[0027] The organic salt and inorganic salt may be granular. The average particle diameter D50 of the organic salt and inorganic salt may be 1 μm or more and 100 μm or less, or 3 μm or more and 40 μm or less. When the average particle diameter D50 is equal to or greater than the lower limit, the salt is easily dispersed in the system. When the average particle diameter D50 is equal to or less than the upper limit, the stability of the coating liquid is improved, and the smoothness of the coated surface tends to be improved. The average particle diameter D50 can be calculated by wet measurement using a laser diffraction particle size distribution analyzer.

[0028] In order to promote the generation of aerosol from the salt when thermal energy is supplied, the fire extinguishing agent may contain a compound having an oxidizing effect. Examples of the compound having an oxidizing effect include chlorates such as potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, and magnesium chlorate. In order to promote the generation of aerosol, potassium chlorate may be used.

[0029] The content of the fire extinguishing agent in the fire extinguishing layer 2 may be 70% by mass or more and 97% by mass or less, or 85% by mass or more and 92% by mass or less, based on the weight of the solid content 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 properties 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 more likely to exhibit sufficient fire extinguishing ability. The weight of the solid content in the fire extinguishing layer 2 corresponds to, for example, the total amount of the fire extinguishing agent and binder.

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

[0031] Thermoplastic resins and thermosetting resins can be used as binders. Examples of thermoplastic resins include polyolefin resins such as polypropylene resins, polyethylene resins, polybutene resins, and polypentene 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 resins (PVA), and polyvinyl butyral resins (PVB). Examples of thermosetting resins 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), and urethane rubber (U), as well as urethane-based resins, phenol-based resins, epoxy-based resins, and polyvinyl ether (PMVE)-maleic anhydride resins. The binder may contain one or more of the above resins. The binder may also contain a curing agent component. From the viewpoint of property stability, the binder may contain any additives such as a surfactant, a silane coupling agent, an antiblocking agent, and the like.

[0032] From the viewpoint of flexibility of the fire extinguishing device 10, the binder may contain a urethane resin, or may contain a polyvinyl butyral resin and an epoxy resin. From the viewpoint of reducing cracking in the fire extinguishing layer 2, 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, the main component of the binder may be a polyvinyl butyral resin from the viewpoint of workability of the fire extinguishing element 11. 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 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; and glycol ethers such as N-methylpyrrolidone, tetrahydrofuran, and butyl cellosolve. The liquid medium may contain one or more of the above solvents. From the viewpoint of being used together with a 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 antiblocking agent, a colorant, an antioxidant, a flame retardant, an inorganic filler, a fluidity imparting agent, a moisture-proofing 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 fire-extinguishing agent, binder, or liquid medium. The content of the other components in the fire-extinguishing layer 2 is, for example, 10 mass% or less based on the total amount of the fire-extinguishing layer 2.

[0035] An example of a method for manufacturing the fire extinguisher 11 is as follows. First, a coating liquid of a composition for forming a fire extinguisher, which contains a fire extinguishing agent, a binder, and a liquid medium, is applied to the surface to be treated of the base layer 1. Next, the coating liquid is dried. As a result, the fire extinguishing layer 2 is formed on the base layer 1. The composition for forming a fire extinguisher can be applied by, for example, a wet coating method. Examples of wet coating methods include gravure coating, comma coating, spray coating, dip coating, curtain coating, spin coating, sponge roll coating, die coating, and painting with a brush.

[0036] (packaging bag) The packaging bag 12 is a bag-shaped member used to maintain the performance of the fire-extinguishing layer 2 for a long period of time. The packaging bag 12 is formed, for example, by heat-sealing the four sides of two resin films. Examples of resins that can be used to form the resin film include polyolefin resins (such as LLDPE, PP, COP, and CPP), polyester resins (such as PET), fluorine-based resins (such as PTFE, ETFE, EFEP, PFA, FEP, and PCTFE), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. The resin film may be composed of one of the above resins or a combination of two or more of them. These resins melt due to the heat of a flame (generally about 700°C to 900°C), easily exposing the base layer 1 and the fire-extinguishing layer 2 inside. The resin film may also contain the fire-extinguishing agent. By selecting a transparent resin, the base layer 1 and the fire-extinguishing layer 2 can be seen through the packaging bag 12. Furthermore, at least a part of the packaging bag 12 may be printed with a figure, pattern, letter, color, or the like. From the viewpoint of maintaining the aesthetic appearance of the packaging bag 12, the fire-extinguishing layer 2 of the fire-extinguishing element 11 may contain a urethane resin as a binder. Alternatively, when the fire-extinguishing layer 2 contains a polyvinyl butyral resin and an epoxy resin, the proportion of the epoxy resin content relative to the total amount of the binder may be, for example, 20 mass% or more.

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

[0038] The following describes the effects achieved by the fire extinguisher 10 according to the embodiment described above. First, from the viewpoint of mass production, it is considered that the fire extinguisher 11 included in the fire extinguisher 10 according to the embodiment is manufactured, for example, by a roll-to-roll method. In such a case, a dried product of the composition for forming a fire extinguisher is formed on a film unwound from a roll, and then the film is cut. This results in the formation of a fire extinguisher 11 having a base layer 1 and a fire extinguishing layer 2 cut to a predetermined size. Here, during the manufacture of the fire extinguisher 11 by the roll-to-roll method, the film on which the dried product is formed may sag depending on the loop stiffness value of the fire extinguisher 11. If such sagging occurs, the film may be cut inappropriately. This may result in variations in the dimensional accuracy of the fire extinguisher 11 after cutting.

[0039] To address such concerns, the loop stiffness value of the fire extinguishing element 11 according to one embodiment is 50 mN or greater. This reduces the risk of warping of the film, even when the fire extinguishing element 11 is manufactured using a manufacturing method that involves cutting a film, such as a roll-to-roll method. This reduces the dimensional accuracy of the fire extinguishing element 11 after cutting. This enables the fire extinguishing element 11 to be manufactured using a method that is highly suitable for mass production. For example, the thicker the base layer 1, the more easily the base layer 1 itself is heated, which can lead to melting or combustion of the base layer 1 itself. In the former case, the heat absorption associated with the melting of the base layer 1 can hinder the propagation of thermal energy from the extinguishing agent, potentially hindering the fire-extinguishing performance of the fire extinguishing layer 2. In the latter case, the fire extinguishing layer 2 extinguishes not only the source of the fire but also the base layer 1, potentially resulting in insufficient extinguishing of the source of the fire. To prevent such problems, the ratio of the thickness of the fire extinguishing layer 2 to the thickness of the base layer 1 is 80% or greater. This can suppress adverse effects of the base material layer 1 on the fire extinguishing performance of the fire extinguishing layer 2. Therefore, according to one embodiment, the fire extinguishing element 11 that can exhibit good fire extinguishing performance can be produced with good 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 element 11 is 125 mN or less. In this case, cracks are less likely to occur in the fire extinguishing layer 2. This makes it possible to suppress the loss of aesthetic appearance of the fire extinguishing element 11 that would otherwise be caused by the occurrence of 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 effectively suppressed. Therefore, the fire-extinguishing performance of the fire-extinguishing element 11 can be improved by increasing the thickness 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, the stiffness and other properties of the fire-extinguishing layer 2 can be easily adjusted by adjusting the ratio of the polyvinyl butyral resin to the epoxy resin in the binder.

[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, which makes the fire-extinguishing layer 2 less susceptible to cracking.

[0044] In one embodiment, the fire extinguisher 10 includes a fire extinguishing element 11 and a packaging bag 12 enclosing the fire extinguishing element 11. In this case, by enclosing the fire extinguishing element 11 in the packaging bag 12, deterioration of the fire extinguishing agent can be suppressed even if the fire extinguishing agent is deliquescent. Therefore, the fire extinguishing element 11 can exert its fire extinguishing performance for a long period of time.

[0045] A fire extinguisher according to one aspect of the present disclosure is as described in the following [1] to [5]. These will be described in detail below based on the above embodiment. [1] A sheet-shaped fire extinguishing body having a base layer and a fire extinguishing layer laminated together, wherein the loop stiffness value of the fire extinguishing body is 50 mN or more, and the thickness of the fire extinguishing layer relative to the thickness of the base layer is 80% or more. [2] The fire extinguisher according to [1], wherein the loop stiffness value of the fire extinguisher minus the loop stiffness value of the base material layer 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 extinguisher 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 embodiment and the above [1] to [5]. One aspect of the present disclosure can be further modified within the scope of the gist thereof. For example, in the above embodiment, the fire extinguishing body has one fire extinguishing layer, but this is not limited thereto. For example, the fire extinguishing body may have two or more fire extinguishing layers. In this case, for example, a fire extinguishing layer may be provided on each of both sides of the base layer. [Example]

[0047] The present disclosure will be described in more detail below based on examples, but the present disclosure is not limited to the following examples.

[0048] <Formation of fire extinguishing body> Example 1 As a fire extinguishing agent, first, a composition for forming a fire extinguishing body was prepared by mixing the following materials in the following mixing ratio. Extinguishing agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate First binder: 73 parts by mass of polyvinyl butyral resin solution (a solution obtained 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: 5 parts by mass of epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) Ethanol 87 parts by weight The mixture of potassium chlorate and tripotassium citrate, a deliquescent salt, was ground in an agate mortar and then filtered through an 800 mesh to adjust the particle size D50 to 12 μm before mixing.

[0049] The composition for forming a fire extinguisher was applied to one side of a 50 μm thick polyethylene terephthalate (PET) substrate layer (product name: E7002, manufactured by Toyobo Co., Ltd.) using an applicator so that the thickness of the fire extinguishing layer after drying would be 120 μm, and then dried in an oven at 75° C. for 7 minutes. As a result, a sheet-like fire extinguishing layer was formed on the surface of the substrate layer, and a fire extinguisher 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 composition for forming a fire extinguishing body was applied to the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 90 μm. Extinguishing agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate Binder: 41 parts by weight of ether-based polyurethane resin solution (a solution obtained by dissolving 100 parts by weight of ether-based polyurethane resin in 210 parts by weight of isopropyl alcohol) Ethanol 87 parts by weight

[0051] Example 3 A fire extinguisher was produced in the same manner as in Example 2, except that the composition for forming a fire extinguisher was applied onto the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 120 μm.

[0052] Example 4 A fire extinguisher was prepared in the same manner as in Example 2, except that the composition for forming a fire extinguisher was applied onto the surface of the base layer so that the thickness of the fire extinguishing layer after drying 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. Extinguishing agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate Binder: 118 parts by weight of polyvinyl butyral resin solution (a solution obtained by dissolving 11 parts by weight of polyvinyl butyral resin in 80 parts by weight of ethanol and 9 parts by weight of isopropyl alcohol) Ethanol 87 parts by weight

[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. Extinguishing agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate First binder: 109 parts by mass of polyvinyl butyral resin solution (a solution obtained 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 epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) Ethanol 87 parts by weight

[0055] Example 7 The fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the base layer was 75 μm and the composition for forming the fire extinguishing body was applied to the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 60 μm.

[0056] Example 8 A fire extinguisher was produced in the same manner as in Example 1, except that the thickness of the substrate layer was set to 75 μm.

[0057] Example 9 A fire extinguisher was produced in the same manner as in Example 1, except that the thickness of the substrate layer was set to 100 μm.

[0058] (Comparative Example 1) A fire extinguisher was prepared in the same manner as in Example 2, except that the composition for forming a fire extinguisher was applied onto the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 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. Extinguishing agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate First binder: 36 parts by mass of polyvinyl butyral resin solution (a solution obtained 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 epoxy resin (Denacol EX-991L, manufactured by Nagase ChemteX Corporation) Ethanol 87 parts by weight

[0060] (Comparative Example 3) The fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the base layer was 25 μm and the composition for forming the fire extinguishing body was applied to the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 60 μm.

[0061] Comparative Example 4 A fire extinguisher was produced in the same manner as in Example 1, except that the thickness of the substrate layer was set to 25 μm.

[0062] (Comparative Example 5) The fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the base layer was 100 μm and the composition for forming the fire extinguishing body was applied to the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 60 μm.

[0063] (Comparative Example 6) The fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the base layer was 250 μm and the composition for forming the fire extinguishing body was applied to the surface of the base layer so that the thickness of the fire extinguishing layer after drying would be 30 μm.

[0064] <Method for measuring loop stiffness> The loop stiffness value was measured using a loop stiffness tester DA-S manufactured by Toyo Seiki Seisakusho Co., Ltd. The loop stiffness value was specifically measured as follows. First, a test film measuring 15 mm in width and 200 mm in length was prepared. Next, both ends of the test film were fixed with chucks to form a loop with a loop length of 85 mm. This loop was compressed with an indenter at 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 indenter at this time was measured. The maximum load measured in this test was used as the loop stiffness value. The compression distance refers to the distance when the indenter and the chuck are closest to each other. The loop stiffness values ​​measured for the base layer and the fire extinguishing body in Examples 1 to 9 and Comparative Examples 1 to 6 are shown in Tables 1 and 2.

[0065] <Enclosed fire extinguishing agent> A barrier film was prepared, comprising a sealant layer (L-LDPE (linear low-density polyethylene) resin, thickness 30 μm) and a substrate layer (PET resin with a silica vapor deposition film, thickness 12 μm). The water vapor permeability of the barrier film was 0.2 to 0.6 g / m. 2 / day (under 40°C / 90%RH conditions). Two sheets of this barrier film were used to cover a sheet-shaped fire extinguisher, and the four sides of the barrier film were heat-sealed to prepare a fire extinguisher sample for evaluation. The heat-sealing conditions were 140°C and 2 seconds.

[0066] The evaluation samples of Examples 1 to 9 and Comparative Examples 1 to 6 obtained by the above methods were evaluated as follows.

[0067] <Fire extinguishing test> An iron container measuring 20 cm in length, 30 cm in width, and 40 cm in height was prepared. A circular vent hole with a diameter of 8.5 mm was provided on each side of the container at a height distance of 5 cm from the top. Similarly, circular vent holes with a diameter of 8.5 mm were provided on each side of the container at positions 12.5 cm, 20.0 cm, 27.5 cm, and 35.0 cm from the top. A fire extinguisher with an area of ​​50 mm x 50 mm was attached to the center of the top of the container with double-sided tape. 1.5 g of solid fuel (Captain Stag Co., Ltd. solid fuel fire block ignition agent) measuring 15 mm in length, 15 mm in width, and 10 mm in height was placed inside the container so that the fire extinguisher and the solid fuel overlapped vertically. When solid fuel was ignited, the fire extinguishing materials were evaluated to see whether they could extinguish the fire within 180 seconds after the solid fuel ignition. The evaluation was based on the following criteria. The evaluation results are shown in Tables 1 and 2. A: The fire extinguisher extinguished the solid fuel within 180 seconds after the solid fuel ignited. B: The fire extinguisher failed to extinguish the solid fuel within 180 seconds after the solid fuel ignited.

[0068] <Evaluation of processing suitability> Using an arbitrary cutting machine, cutting was carried out at a speed of 5 m / min at a feed rate of 190 mm. Evaluation was carried out based on the following criteria. The evaluation results are shown in Tables 1 and 2. A: The sheet-shaped fire extinguishing material was transported without bending. B: The cut sheet-shaped fire extinguishing body was warped, resulting in variations in the dimensional accuracy of the cut fire extinguishing body.

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

[0070] [Table 1]

[0071] [Table 2]

[0072] The fire extinguishing elements in Examples 1 to 9 had excellent fire extinguishing performance and processability because their loop stiffness values ​​were 50 mN or more and the ratio of the thickness of the fire extinguishing layer to the thickness of the substrate layer was 80% or more. In Example 7, the loop stiffness value of the fire extinguishing element minus the loop stiffness value of the substrate layer was calculated to be 0 mN. However, this calculation result (measurement error) is obtained when the loop stiffness value of the substrate layer is dominant in the loop stiffness value of the fire extinguishing element. Therefore, the loop stiffness value of the fire extinguishing element excluding the substrate layer is not necessarily 0 mN. Furthermore, the fire extinguishing element in Example 5 had cracks on the surface of the fire extinguishing layer, but the cracks had almost no effect on the fire extinguishing performance and processability of the fire extinguishing element.

[0073] On the other hand, the fire extinguishing bodies in Comparative Examples 1 to 4 had poor processability because their loop stiffness values ​​were less than 50 mN, and the fire extinguishing bodies in Comparative Examples 5 and 6 had poor fire extinguishing performance because the ratio of the thickness of the fire extinguishing layer to the thickness of the base layer was less than 80%. [Explanation of symbols]

[0074] 1...base material layer, 2...extinguishing layer, 10...extinguishing device, 11...extinguishing body, 12...packaging bag.

Claims

1. A sheet-like fire extinguishing body having a base layer and a fire extinguishing layer laminated together, The loop stiffness value of the fire extinguisher is 50 mN or more, A fire extinguishing body, wherein the ratio of the thickness of the fire extinguishing layer to the thickness of the base layer is 80% or more.

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

3. the fire-extinguishing layer includes a fire-extinguishing agent and a binder; The fire extinguisher according to claim 1 or 2, wherein the binder contains a urethane resin.

4. the fire-extinguishing layer includes a fire-extinguishing agent and a binder; 3. The fire extinguishing body according to claim 1, wherein the binder comprises a polyvinyl butyral resin and an epoxy resin.

5. the polyvinyl butyral resin is a main component of the binder; The fire extinguisher according to claim 4, wherein 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.

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