Fire extinguishing body and fire extinguishing device provided with fire extinguishing body

Abstract

A fire extinguishing body and a fire extinguishing device provided with the fire extinguishing body, the fire extinguishing body being a sheet-like fire extinguishing body having a base material layer and a fire extinguishing layer stacked on each other, the fire extinguishing body having a ring stiffness value of 50 mN or more, and the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer being 80% or more.

Description

Technical Field

[0001] This disclosure relates to fire extinguishing bodies and fire extinguishing devices equipped with fire extinguishing bodies. Background Technology

[0002] Regarding the problems of fire and conflagration, Patent Document 1 proposes the use of fire extinguishing liquid and fire extinguishers. Patent Document 2 proposes an automatic fire extinguishing device that can be dropped from a helicopter. Patent Document 3 proposes an aerosol fire extinguishing device.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 9-276440

[0006] Patent Document 2: Japanese Patent Application Publication No. 2015-6302

[0007] Patent Document 3: Japanese Patent Application Publication No. 2017-080023 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] As illustrated in Patent Document 3 above, the extinguishing body differs from powdered extinguishing materials; it is a molded body with a defined shape. In the mass production of such a molded extinguishing body, not only its extinguishing performance but also its processability (mass production capability) must be considered.

[0010] One aspect of this disclosure is to provide a fire extinguishing body that can be manufactured with high productivity and performs well in extinguishing fires, and a fire extinguishing device equipped with a fire extinguishing body.

[0011] Solution for solving the problem

[0012] The inventors of this disclosure have discovered that if the ring stiffness value of the fire extinguishing body is too small, there is a tendency for defects to occur during the processing of the fire extinguishing body. For example, when manufacturing a sheet-like fire extinguishing body by roll-to-roll method, a defect was found where the fire extinguishing body flexed depending on the ring stiffness value. As a countermeasure to the aforementioned defect, one possible method is to thicken the substrate layer to increase the ring stiffness value of the fire extinguishing body. However, in this case, it was also found that it may adversely affect the fire extinguishing performance of the fire extinguishing body. Based on the above insights, one aspect of the fire extinguishing body of this disclosure is a sheet-like fire extinguishing body having a substrate layer and a fire extinguishing layer that are stacked together, wherein the ring stiffness value of the fire extinguishing body is 50 mN or more, and the thickness of the fire extinguishing layer is 80% or more of the thickness of the substrate layer.

[0013] Alternatively, the value obtained by subtracting the ring stiffness of the base layer from the ring stiffness value of the extinguishing body is less than 125 mN. In this case, cracks are less likely to form in the extinguishing layer.

[0014] Alternatively, the extinguishing layer may contain an extinguishing agent and an adhesive, or the adhesive may contain urethane resin. In this case, cracks are less likely to form in the extinguishing layer. Alternatively, the urethane resin content may be 50% by mass or more, based on the total amount of adhesive. Furthermore, one aspect of this disclosure may be a fire extinguishing device comprising the aforementioned extinguishing agent and a packaging bag containing the extinguishing agent, wherein the resin film contained in the packaging bag contains an extinguishing agent. With such a fire extinguishing device, the performance of the extinguishing layer can be maintained for a long period and the fire extinguishing performance can be improved through the packaging bag.

[0015] Alternatively, the fire extinguishing layer may contain a fire extinguishing agent and an adhesive, or the adhesive may contain polyvinyl butyral resin and epoxy resin. In this case, the rigidity and strength of the fire extinguishing layer can be easily adjusted by changing the ratio of polyvinyl butyral resin to epoxy resin in the adhesive.

[0016] Alternatively, polyvinyl butyral resin can be the main component of the adhesive, and the epoxy resin content can be 5% by mass or more and 45% by mass or less, based on the total amount of adhesive. In this case, cracks are less likely to form in the fire extinguishing layer. Alternatively, one aspect of this disclosure is a fire extinguishing device comprising the aforementioned fire extinguishing body and a packaging bag containing the fire extinguishing body, wherein the epoxy resin content is 20% by mass or more, based on the total amount of adhesive, and the resin film contained in the packaging bag contains a fire extinguishing agent. With such a fire extinguishing device, the performance of the fire extinguishing layer can be maintained for a long time and the fire extinguishing performance can be improved through the packaging bag.

[0017] Alternatively, the substrate layer may have multiple resin layers, with the resin layers furthest from the extinguishing layer having lower melting points. In this case, the resin layers furthest from the extinguishing layer have higher melting points, thus suppressing the adverse effects of the substrate layer on the extinguishing layer's performance. Furthermore, the thickness of the extinguishing agent may be 50 μm or more and 500 μm or less, and the thickness of the substrate layer may be 30 μm or more and 150 μm or less. Alternatively, the ratio of the extinguishing layer's thickness to the substrate layer's thickness may be 80% or more and 200% or less. It should be noted that the ring stiffness of the extinguishing layer may also be 60 mN or more and 200 mN or less.

[0018] Invention Effects

[0019] According to this disclosure, it is possible to provide a fire extinguishing body that can be manufactured with high productivity and that can perform fire extinguishing well, and a fire extinguishing device equipped with a fire extinguishing body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the appearance of a fire extinguishing device according to one embodiment.

[0021] Figure 2 This is a schematic cross-sectional view of one embodiment of a fire extinguishing device. Figure 1 Sectional view along line II-II. Detailed Implementation

[0022] The embodiments of this disclosure will now be described in detail. However, this disclosure is not limited to the embodiments described below.

[0023] <Fire Extinguishing Body>

[0024] Figure 1 This is a schematic diagram of the appearance of a fire extinguishing device according to one embodiment. Figure 2 This is a schematic cross-sectional view of one embodiment of a fire extinguishing device. Figure 1 Sectional view along line II-II. Figure 1 and Figure 2 The fire extinguishing device 10 shown is, for example, a sheet-like component used to prevent the occurrence and spread of a fire. The fire extinguishing device 10 is, for example, pre-installed on or near an object that is likely to catch fire. In the event of a fire originating from the object, the fire extinguishing device 10 performs initial fire extinguishing according to the mechanism described later. It should be noted that objects that are likely to catch fire include, for example, electrical wires, distribution panels, sub-distribution panels, control panels, batteries (lithium-ion batteries, etc.), building materials such as wallpaper and ceiling materials, lithium-ion battery recycling bins, garbage cans, automotive components, sockets, socket covers, etc. For example, in the aforementioned objects equipped with the fire extinguishing device 10, initial fire extinguishing will be automatically performed upon ignition. Therefore, an object equipped with the fire extinguishing device 10 can be referred to as a device with an automatic fire extinguishing function.

[0025] The fire extinguishing device 10 includes a fire extinguishing body 11 and a packaging bag 12.

[0026] The extinguishing body 11 is a sheet-like component that functions as a main part of the fire extinguishing device 10, and has a substrate layer 1 and an extinguishing layer 2 stacked on top of each other. The thickness of the extinguishing body 11 is, for example, 50 μm or more and 500 μm or less. The thickness of the extinguishing body 11 can also 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 ring stiffness value of the extinguishing body 11 is, for example, 50 mN or more and 350 mN or less. In this case, cracks are less likely to form in the extinguishing body 11 (especially the extinguishing layer 2 described later). The ring stiffness value can be 60 mN or more, 75 mN or more, 100 mN or more, 125 mN or more, 150 mN or more, less than 300 mN, less than 250 mN, less than 200 mN, or less than 175 mN. It should be noted that the ring stiffness value of the extinguishing body 11 is equivalent to the stress when the extinguishing body 11 is bent into a ring shape and compressed in the diameter direction of the ring. Generally, the larger the ring stiffness value of the membrane, the stronger the toughness of the membrane. The ring stiffness value of the extinguishing body 11 can be obtained, for example, by using a ring stiffness tester as described in the embodiments described later.

[0027] (Substrate layer)

[0028] The substrate layer 1 is a sheet-like component that serves as the base for the fire extinguishing layer 2, such as a cut-out of a membrane. The thickness of the substrate layer 1 can be appropriately selected based on the performance of the fire extinguishing device 10, the permissible size of the fire extinguishing device 10, and other factors. For example, if the substrate layer 1 is thick, it is not only easier to obtain high strength and high ring stiffness values ​​for the fire extinguishing device 10, but also easier to achieve a shape with high planarity. Therefore, the thicker the substrate layer 1, the easier it is to handle the fire extinguishing device 10. Furthermore, if the substrate layer 1 is thin, it is easier to install the fire extinguishing device 10 in confined spaces. In addition, it is easier to make openings in the substrate layer 1 in a short time, thus shortening the fire extinguishing initiation time. From the above perspective, the thickness of the substrate layer 1 can be 30 μm or more and 150 μm or less, or 30 μm or more and 100 μm or less, or 30 μm or more and 75 μm or less, or 50 μm or more and 150 μm or less, or 50 μm or more and 100 μm or less, or 50 μm or more and 75 μm or less.

[0029] From the viewpoint of ensuring the ring stiffness value of the extinguishing body 11 is 50 mN or more, the ring 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 cracking in the extinguishing layer 2, the ring stiffness value of the base material layer 1 needs to be moderately suppressed. From the above viewpoints, the value obtained by subtracting the ring stiffness value of the base material layer 1 from the ring stiffness value of the extinguishing body 11 is, for example, 125 mN or less. This value can also 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. Furthermore, the lower limit of the value obtained by subtracting the ring stiffness value of the base material layer 1 from the ring stiffness value of the extinguishing body 11 is not particularly limited, and it can be 0 mN or more. It should be noted that the ring stiffness value of the base material layer 1 is, for example, 30 mN or more and 300 mN or less.

[0030] As the substrate layer 1, a resin layer may be selected, for example. Examples of materials included in this resin layer include polyolefin resins (low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), medium-density polyethylene resin (MDPE), polypropylene resin (PP), cyclic olefin polymer (COP), unstretched polypropylene resin (CPP), etc.), polyester resins (PET, etc.), fluorine resins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC (Polyvinyl Chloride), PVA (Polyvinyl Alcohol), acrylic resins, epoxy resins, polyamides, polyimides, etc. In this case, since the temperature of the flame is typically above 700°C and below approximately 900°C, an opening can be made in the substrate layer 1 when extinguishing the fire using the fire extinguishing device 10. The extinguishing agent, described later, may be included in the substrate layer 1. The substrate layer 1 may consist of a single resin layer formed from the aforementioned materials, or it may consist of multiple resin layers. Multiple resin layers can be resin layers formed from different materials. When the substrate layer 1 is composed of multiple resin layers, these resin layers can be bonded together by an adhesive (adhesive layer). Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or synthetic adhesives thereof. From the viewpoint of maximizing the fire extinguishing performance of the fire extinguishing layer 2, the resin layers in the substrate layer 1 that are farther from the fire extinguishing layer 2 may have lower melting points. The material of this resin layer is, for example, a polyolefin resin.

[0031] The aforementioned resin layer can be heat-melting (heat-sealing). A resin layer with heat-melting properties can be referred to as a heat-melting layer. For example, a resin layer provided in the substrate layer 1 near the fire extinguishing layer 2. When the substrate layer 1 has a heat-melting layer, the sealing portion of the packaging bag 12 can be referred to as a heat-sealing portion. Polyolefin resins can be listed as heat-melting resins. That is, the resin layer can contain polyolefin resins. In addition to the aforementioned polyolefin resins, other examples of polyolefin resins include: polyethylene resins such as ethylene-vinyl acetate copolymers and ethylene-α-olefin copolymers; and polypropylene resins such as propylene-ethylene random copolymers, propylene-ethylene block copolymers, and propylene-α-olefin copolymers. From the viewpoint of heat-sealing properties and water vapor transmission rate, polyolefin resins can include LDPE, LLDPE, or unstretched polypropylene resin (CPP). These resins are transparent. Therefore, visual inspection of the fire extinguishing layer 2 through the substrate layer 1 can be performed. This also facilitates the confirmation of the replacement period of the fire extinguishing device 10.

[0032] Without a heat-melting layer, the resin layers contained in the substrate layer 1 can be bonded together using an adhesive. Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or synthetic adhesives thereof. From the viewpoints of excellent adhesion at high temperature and humidity (85°C–85%RH) and low cost, an epoxy-urethane synthetic adhesive is preferable.

[0033] The substrate layer 1 may include a water vapor barrier layer. For example, the water vapor barrier layer may be an intermediate layer of the substrate layer 1. When the substrate layer 1 has a water vapor barrier layer, the water vapor barrier properties of the extinguishing layer 2 are easily maintained to a degree that does not significantly change, regardless of the installation location or operating environment of the fire extinguishing device 10. The water vapor transmission rate of the water vapor barrier layer (according to JIS K 7129, under 40℃ / 90%RH conditions) can be designed according to the type of extinguishing agent contained in the extinguishing layer 2, and is therefore not particularly limited, and can be set to 10 g / m³. 2 / day or less, can also be 1g / m 2 / day or less. From the viewpoint of adjusting water vapor transmission rate, as a water vapor barrier layer, examples include polyester resin layers (e.g., PET layers) and metal foils such as aluminum foil, which have metal oxide vapor-deposited layers such as alumina or silica. When the water vapor barrier layer has a metal oxide vapor-deposited layer, the metal oxide vapor-deposited layer can be provided, for example, near the fire extinguishing layer 2.

[0034] (Fire extinguishing layer)

[0035] The extinguishing layer 2 is a sheet-shaped molded body comprising a composition (composition for forming the extinguishing layer) containing an extinguishing agent and an adhesive, disposed on the substrate layer 1. By using an adhesive to mold the extinguishing agent, it is easy to maintain the properties of the extinguishing agent. As a result, the replacement frequency of the fire extinguishing device 10 can be reduced. There is a tendency that the greater the thickness of the extinguishing layer 2, the better the fire extinguishing performance of the fire extinguishing device 10. The fire extinguishing ability exerted by the extinguishing layer 2 is exerted not only on heat sources such as flames, but also on the substrate layer 1 heated by such heat sources. Therefore, in one embodiment, a balance between the thickness of the substrate layer 1 and the thickness of the extinguishing layer 2 in the fire extinguishing body 11 is also considered. The ratio of the thickness of the extinguishing layer 2 to the thickness of the substrate layer 1 is, for example, 80% or more, 120% or more, 160% or more, or 180% or more, and is 400% or less, 350% or less, 300% or less, or 240% or less. Furthermore, 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 is less than 250 μm, 220 μm, 200 μm or less, or 180 μm or less. In addition to the fire extinguishing agent and binder, the above-mentioned fire extinguishing layer forming composition may also contain a liquid medium.

[0036] Extinguishing agents extinguish fires by producing aerosols through combustion. Extinguishing agents may contain at least one salt selected from organic and inorganic salts. Both organic and inorganic salts may be hygroscopic.

[0037] Organic salts that function as fire extinguishing agents include potassium salts, sodium salts, and ammonium salts. Potassium salts can be used as organic salts. Examples of organic potassium salts include potassium acetate, potassium citrate (monopotassium citrate, dipotassium citrate, or tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate, among other carboxylic acid potassium salts. From the perspective of their usefulness in negatively catalyzing combustion, organic potassium salts can be potassium acetate or potassium citrate.

[0038] Inorganic salts that function as fire extinguishing agents include, for example, potassium salts and sodium salts. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium bicarbonate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate. From the perspective of its usefulness in negatively catalyzing combustion, potassium bicarbonate is a suitable inorganic salt.

[0039] Organic and inorganic salts can be in granular form. The average particle size D50 of organic and inorganic salts can be 1 μm or more and 100 μm or less, or 3 μm or more and 40 μm or less. An average particle size D50 above the lower limit indicates good dispersion in the system; conversely, an average particle size D50 below the upper limit tends to improve the stability of the coating solution and the smoothness of the coated surface. The average particle size D50 can be calculated by wet measurement using a laser diffraction particle size distribution measuring device.

[0040] From the viewpoint of promoting the generation of aerosols from the aforementioned salts along with the supply of heat energy, fire extinguishing agents can contain compounds with oxidizing properties. Examples of oxidizing compounds include chlorates such as potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, and magnesium chlorate. Potassium chlorate can be used from the viewpoint of promoting aerosol generation.

[0041] Based on the weight of the solid components contained in fire extinguishing layer 2, the content of the extinguishing agent contained in fire extinguishing layer 2 can be 70% by mass or more and 97% by mass or less, or 85% by mass or more and 92% by mass or less. With an extinguishing agent content of 97% by mass or less, deliquescence due to salt is less likely to occur. Furthermore, the film-forming properties of the composition for forming the extinguishing agent are improved. With an extinguishing agent content of 70% by mass or more, fire extinguishing layer 2 easily exerts its full extinguishing capability. The weight of the solid components contained in fire extinguishing layer 2 is, for example, equivalent to the total amount of extinguishing agent and binder.

[0042] The adhesive is a material used to shape the extinguishing agent. Based on the weight of the solid components contained in the extinguishing layer 2, the content of the adhesive in the extinguishing layer 2 can be 2% by mass or more and 20% by mass or less, or 4% by mass or more and 15% by mass or less. When the adhesive content is 20% by mass or less, there is a tendency for improved surface smoothness of the coating film after drying. When the adhesive content is 2% by mass or more, roll-to-roll coating adaptability is easily improved when applying the extinguishing layer 2.

[0043] As adhesives, thermoplastic resins and thermosetting resins can be used. Examples of thermoplastic resins include polypropylene resins, polyethylene resins, polybutene resins, polypentene resins and other polyolefin resins, polystyrene resins, acrylonitrile-butadiene-styrene resins, methyl methacrylate-butadiene-styrene resins, ethylene-vinyl acetate resins, ethylene-propylene resins, polycarbonate resins, polyphenylene ether resins, acrylic resins, polyamide resins, polyvinyl chloride resins, polyvinyl alcohol resins (PVA), and polyvinyl butyral resins (PVB). Examples of thermosetting resins include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), polysulfide rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U), and other rubbers, urethane resins, phenolic resins, epoxy resins, and polyvinyl ether (PMVE)-maleic anhydride resins. Adhesives may contain one or more of these resins. Adhesives may contain curing agents. From the viewpoint of morphological stability, adhesives may contain any additives such as surfactants, silane coupling agents, and anti-blocking agents.

[0044] From the viewpoint of flexibility of the fire extinguishing device 10, the adhesive may contain urethane resin, polyvinyl butyral resin, and epoxy resin. From the viewpoint of reducing crack formation in the fire extinguishing layer 2, the main component of the adhesive may be urethane resin. When the adhesive contains urethane resin, the content of urethane resin may be 50% or more by mass, 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, or 100% by mass, based on the total amount of the adhesive. When the adhesive contains polyvinyl butyral resin and epoxy resin, from the viewpoint of processability of the fire extinguishing body 11, polyvinyl butyral resin may be the main component of the adhesive. In this case, for example, based on the total amount of the adhesive, the content of epoxy resin may be 5% or more by mass and 45% or less by mass. For example, based on the total amount of the adhesive, the content of epoxy resin may also be 8% or more by mass, 15% or more by mass, 20% or more by mass, 40% or less by mass, 30% or less by mass, or 25% or less by mass.

[0045] Organic solvents can be listed as liquid media. Water-soluble solvents can be listed as such, for example: alcohols such as methanol, ethanol, isopropanol, and n-propanol; 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 media may contain one or more of the above solvents. From the viewpoint of use with salts, the liquid media may be alcohol-based solvents such as ethanol. The amount of liquid media is not particularly limited, but can be set to 30% by mass or more and 70% by mass or less, based on the total amount of fire extinguishing layer 2.

[0046] Fire extinguishing layer 2 may also contain other components, including at least one of surfactants, silane coupling agents, anti-blocking agents, colorants, antioxidants, flame retardants, inorganic fillers, flowability improvers, moisture-proofing agents, dispersants, UV (ultraviolet) absorbers, flexibility improvers, and catalysts. These other components may be appropriately selected depending on the type of extinguishing agent, adhesive, or liquid medium. Based on the total amount of fire extinguishing layer 2, the content of other components contained in fire extinguishing layer 2 is, for example, less than 10% by mass.

[0047] An example of a method for manufacturing the fire extinguishing agent 11 is as follows. First, a coating liquid containing a fire extinguishing agent, an adhesive, and a liquid medium for forming a fire extinguishing agent is applied to the surface to be treated of the substrate layer 1. Next, the coating liquid is dried. Thus, a fire extinguishing layer 2 is formed on the substrate layer 1. The application of the fire extinguishing agent forming composition can be performed, for example, by a wet coating method. Examples of wet coating methods include gravure coating, comma coating, spraying, dip coating, curtain coating, spin coating, sponge roller coating, mold coating, and brush coating.

[0048] (Packaging bag)

[0049] The packaging bag 12 is a bag-shaped component 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 resins constituting the resin films include polyolefin resins (LLDPE, PP, COP, CPP, etc.), polyester resins (PET, etc.), fluoropolymer resins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. The resin film can be composed of one of the above resins or a combination of two or more. If these resins are used, they will melt due to the heat of the flame (typically around 700°C to 900°C), easily exposing the inner substrate layer 1 and the fire extinguishing layer 2. Furthermore, the fire extinguishing agent can also be included in the resin film. By selecting a transparent material as the resin, the substrate layer 1 and the fire extinguishing layer 2 can be visually identified through the packaging bag 12. In addition, at least a portion of the packaging bag 12 may be printed with images, patterns, text, colors, etc. From the viewpoint of maintaining the aesthetics of the packaging bag 12, the extinguishing layer 2 of the extinguishing body 11 may contain urethane resin as an adhesive. Alternatively, if the extinguishing layer 2 contains polyvinyl butyral resin and epoxy resin, the epoxy resin content relative to the total amount of adhesive may, for example, be 20% by mass or more.

[0050] The water vapor transmission rate of the resin membrane (according to JIS K 7129, 40℃ / 90%RH) can be designed according to the type of extinguishing agent 20. For example, the water vapor transmission rate of the resin membrane is 10.0 g / m³. 2 / day or less or 1.0g / m 2 / day or less. From the perspective of adjusting water vapor transmission rate, a vapor-deposited layer (alumina vapor-deposited layer or silicon dioxide vapor-deposited layer) with water vapor barrier properties can also be provided on the resin film.

[0051] The effects of the fire extinguishing device 10 according to one embodiment described above will now be explained. First, from a mass production perspective, it is conceivable that the fire extinguishing body 11 included in one embodiment of the fire extinguishing device 10 is manufactured, for example, by a roll-to-roll process. In this case, after a dried product of the fire extinguishing body forming composition is formed on a film unwound from a roll, the film is cut. This forms a fire extinguishing body 11 having a substrate layer 1 and a fire extinguishing layer 2 cut to a predetermined size. However, during the manufacture of the fire extinguishing body 11 by the roll-to-roll process, the film on which the dried product is formed may flex, depending on the ring stiffness value of the fire extinguishing body 11. When such flex occurs, the film may sometimes be improperly cut. Therefore, there is concern about uneven dimensional accuracy of the cut fire extinguishing body 11.

[0052] To address such concerns, the ring stiffness of the extinguishing body 11 in one embodiment is 50 mN or more. Therefore, even when the extinguishing body 11 is manufactured using a film-cutting process, such as roll-to-roll, the aforementioned film deflection is less likely to occur. Thus, uneven dimensional accuracy of the cut extinguishing body 11 can be suppressed. Consequently, the extinguishing body 11 can be manufactured using a highly producible method. For example, the thicker the substrate layer 1, the easier it is to heat itself, sometimes leading to melting or combustion of the substrate layer 1. In the former case, the heat absorption accompanying the melting of the substrate layer 1 hinders the heat transfer of the extinguishing agent, sometimes preventing the extinguishing performance of the extinguishing layer 2 from being fully utilized. In the latter case, the extinguishing layer 2 extinguishes not only the fire source but also the substrate layer 1, potentially resulting in insufficient extinguishing of the fire source. From the viewpoint of suppressing such adverse conditions, the thickness of the extinguishing layer 2 is 80% or more relative to the thickness of the substrate layer 1. Therefore, the adverse effects of the substrate layer 1 on the fire extinguishing performance of the fire extinguishing layer 2 can be suppressed. Thus, according to one embodiment, a fire extinguishing body 11 that can effectively perform fire extinguishing tasks can be manufactured with high productivity.

[0053] In one embodiment, the value obtained by subtracting the ring stiffness value of the base layer 1 from the ring stiffness value of the fire extinguishing body 11 is 125 mN or less. In this case, cracks are less likely to form in the fire extinguishing layer 2. As a result, the loss of aesthetics of the fire extinguishing body 11 that would accompany the formation of such cracks can be suppressed.

[0054] In one embodiment, the fire extinguishing layer 2 may comprise a fire extinguishing agent and an adhesive, or the adhesive may comprise a urethane resin. In this case, the formation of cracks in the fire extinguishing layer 2 can be effectively suppressed. Thus, the fire extinguishing performance of the fire extinguishing body 11 can be improved by thickening the fire extinguishing layer 2.

[0055] In one embodiment, the fire extinguishing layer 2 may comprise a fire extinguishing agent and an adhesive, or the adhesive may comprise polyvinyl butyral resin and epoxy resin. In this case, the rigidity and other properties of the fire extinguishing layer 2 can be easily adjusted by changing the ratio of polyvinyl butyral resin to epoxy resin in the adhesive.

[0056] In one embodiment, the epoxy resin content may be 5% by mass or more and 45% by mass or less, based on the total amount of adhesive. In this case, cracks are less likely to form in the fire-extinguishing layer 2.

[0057] In one embodiment, the fire extinguishing device 10 includes a fire extinguishing body 11 and a packaging bag 12 for encapsulating the fire extinguishing body 11. In this case, by encapsulating the fire extinguishing body 11 in the packaging bag 12, the deterioration of the fire extinguishing agent can be suppressed even if the fire extinguishing agent is hygroscopic. Therefore, the fire extinguishing body 11 can maintain its fire extinguishing performance for a long period of time.

[0058] One aspect of the fire extinguishing body disclosed herein is described below as [1] to

[12] . Hereinafter, they will be described in detail based on the above embodiments.

[0059] [1] A fire extinguishing body is a sheet-shaped fire extinguishing body having a substrate layer and a fire extinguishing layer stacked on each other, wherein the ring stiffness of the fire extinguishing body is 50mN or more, and the thickness of the fire extinguishing layer is 80% or more relative to the thickness of the substrate layer.

[0060] [2] According to the fire extinguishing body described in [1], the value obtained by subtracting the ring stiffness value of the substrate layer from the ring stiffness value of the fire extinguishing body is 125 mN or less.

[0061] [3] The extinguishing body according to [1] or [2], wherein the extinguishing layer comprises an extinguishing agent and an adhesive, the adhesive comprising a urethane resin.

[0062] [4] According to the fire extinguishing body described in [3], the content of the urethane resin is 50% by mass or more, based on the total amount of the adhesive.

[0063] [5] A fire extinguishing device comprising: a fire extinguishing body as described in [3] or [4]; and a packaging bag containing the fire extinguishing body, wherein the resin film contained in the packaging bag contains the fire extinguishing agent.

[0064] [6] The extinguishing body according to [1] or [2], wherein the extinguishing layer comprises an extinguishing agent and an adhesive, the adhesive comprising polyvinyl butyral resin and epoxy resin.

[0065] [7] According to the fire extinguishing body described in [6], the polyvinyl butyral resin is the main component of the adhesive, 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 adhesive.

[0066] [8] A fire extinguishing device comprising: the fire extinguishing body described in [7]; and a packaging bag containing the fire extinguishing body, wherein the content of the epoxy resin is 20% by mass or more based on the total amount of the adhesive, and the resin film contained in the packaging bag contains the fire extinguishing agent.

[0067] [9] The fire extinguishing body according to any one of [1] to [4], [6], [7] or the fire extinguishing device according to [5] or [8], wherein the substrate layer has a plurality of resin layers, and the resin layers farther away from the fire extinguishing layer have a lower melting point.

[0068]

[10] The fire extinguishing body or the fire extinguishing device according to any one of [1] to [4], [6], [7], [9] or [5] or [8], wherein the thickness of the fire extinguishing body is 50 μm or more and 500 μm or less, and the thickness of the substrate layer is 30 μm or more and 150 μm or less.

[0069]

[11] The fire extinguishing body or the fire extinguishing device according to any one of [1] to [4], [6], [7], [9],

[10] or [5] or [8], wherein the thickness of the fire extinguishing layer is 80% or more and 200% or less relative to the thickness of the substrate layer.

[0070]

[12] The fire extinguishing body or the fire extinguishing device according to any one of [1] to [4], [6], [7], [9],

[10] ,

[11] or the fire extinguishing device according to [5] or [8], wherein the ring stiffness value of the fire extinguishing layer is 60mN or more and 200mN or less.

[0071] However, one aspect of this disclosure is not limited to the above-described embodiments and [1] to

[12] . This aspect of the disclosure can be further modified without departing from its spirit. For example, in the above-described embodiments, the fire extinguishing body has one fire extinguishing layer, but is not limited thereto. For example, the fire extinguishing body may also have two or more fire extinguishing layers. In this case, for example, fire extinguishing layers may be provided on both sides of the substrate layer.

[0072] [Example]

[0073] The present disclosure will now be described in more detail based on the embodiments, but the present disclosure is not limited to the following embodiments.

[0074] <Formation of Fire Extinguishing Body>

[0075] (Example 1)

[0076] As a fire extinguishing agent, firstly, a fire extinguishing body forming composition was prepared by mixing the following materials in the following proportions.

[0077] • Digestive agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate

[0078] • First adhesive: 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 isopropanol) 73 parts by weight

[0079] • Second adhesive: 5 parts by weight of epoxy resin (manufactured by Nagase ChemteX Co., Ltd., DENACOL EX-991L).

[0080] • 87 parts by weight of ethanol

[0081] It should be noted that the mixture of potassium chlorate and tripotassium citrate, which is a deliquescent salt, is obtained as follows: after being crushed in an agate mortar, it is filtered through an 800-grid sieve to adjust the particle size D50 to 12 μm, and then mixed.

[0082] After applying the above-mentioned fire extinguishing body forming composition to one side of a 50 μm thick polyethylene terephthalate (PET) substrate layer (trade name: E7002, manufactured by Toyobo Co., Ltd.) with a dried fire extinguishing layer thickness of 120 μm using a coating applicator, it was dried in an oven at 75°C for 7 minutes. This produced a sheet-like fire extinguishing layer on the surface of the substrate layer, thus obtaining the fire extinguishing body.

[0083] (Example 2)

[0084] Except that various materials were prepared as follows and the fire extinguishing material was applied to the surface of the substrate layer with the fire extinguishing layer having a thickness of 90 μm after drying, the fire extinguishing material was obtained in the same manner as in Example 1.

[0085] • Digestive agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate

[0086] • Adhesive: 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 isopropanol) 41 parts by weight

[0087] • 87 parts by weight of ethanol

[0088] (Example 3)

[0089] Except that the fire extinguishing body forming composition was applied to the surface of the substrate layer in such a way that the thickness of the dried fire extinguishing layer was 120 μm, the fire extinguishing body was made in the same manner as in Example 2.

[0090] (Example 4)

[0091] The fire extinguishing body was prepared in the same manner as in Example 2, except that the fire extinguishing body forming composition was applied to the surface of the substrate layer in such a way that the thickness of the dried fire extinguishing layer was 200 μm.

[0092] (Example 5)

[0093] In addition to the various materials prepared as described below, fire extinguishing materials were obtained in the same manner as in Example 1.

[0094] • Digestive agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate

[0095] • Adhesive: 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 isopropanol) 118 parts by weight

[0096] • 87 parts by weight of ethanol

[0097] (Example 6)

[0098] In addition to the various materials prepared as described below, fire extinguishing materials were obtained in the same manner as in Example 1.

[0099] • Digestive agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate

[0100] • First adhesive: 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 isopropanol) 109 parts by mass

[0101] • Second adhesive: Epoxy resin (manufactured by Nagase ChemteX Co., Ltd., DENACOL EX-991L) 1 part by weight

[0102] • 87 parts by weight of ethanol

[0103] (Example 7)

[0104] Except that the fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the substrate layer was set to 75 μm and the thickness of the dried fire extinguishing layer was 60 μm.

[0105] (Example 8)

[0106] Except that the thickness of the substrate layer was set to 75 μm, the fire extinguishing body was fabricated in the same manner as in Example 1.

[0107] (Example 9)

[0108] Except that the thickness of the substrate layer was set to 100 μm, the fire extinguishing body was made in the same manner as in Example 1.

[0109] (Comparative Example 1)

[0110] Except that the fire extinguishing body forming composition was applied to the surface of the substrate layer in such a way that the thickness of the dried fire extinguishing layer was 60 μm, the fire extinguishing body was made in the same manner as in Example 2.

[0111] (Comparative Example 2)

[0112] In addition to the various materials prepared as described below, fire extinguishing materials were obtained in the same manner as in Example 1.

[0113] • Digestive agent ingredients: 87 parts by weight of a mixture of potassium chlorate and tripotassium citrate

[0114] • First adhesive: 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 isopropanol) 36 parts by weight

[0115] • Second adhesive: 9 parts by weight of epoxy resin (manufactured by Nagase ChemteX Co., Ltd., DENACOL EX-991L).

[0116] • 87 parts by weight of ethanol

[0117] (Comparative Example 3)

[0118] Except that the fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the substrate layer was set to 25 μm and the thickness of the dried fire extinguishing layer was 60 μm.

[0119] (Comparative Example 4)

[0120] Except that the thickness of the substrate layer was set to 25 μm, the fire extinguishing body was fabricated in the same manner as in Example 1.

[0121] (Comparative Example 5)

[0122] Except that the fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the substrate layer was set to 100 μm and the thickness of the dried fire extinguishing layer was 60 μm.

[0123] (Comparative Example 6)

[0124] Except that the fire extinguishing body was prepared in the same manner as in Example 1, except that the thickness of the substrate layer was set to 250 μm and the thickness of the dried fire extinguishing layer was 30 μm.

[0125] <Method for determining ring stiffness>

[0126] The ring stiffness value was measured using a ring stiffness tester DA-S manufactured by Toyo Seiki Co., Ltd. Specifically, the ring stiffness value was measured as follows: First, a test membrane with a width of 15 mm and a length of 200 mm was prepared. Next, a ring with a length of 85 mm was formed by fixing both ends of the test membrane with a chuck. The ring was compressed by a pressure head at a compression speed of 3.3 mm / min, a compression time of 3 seconds, and a compression distance of 20 mm. The load on the pressure head was measured. The maximum value of the load measured in this test was used as the ring stiffness value. It should be noted that the compression distance represents the distance when the pressure head and the chuck are closest. The ring stiffness values ​​measured for the substrate layer and extinguishing body in Examples 1-9 and Comparative Examples 1-6 are shown in Tables 1 and 2.

[0127] <Encapsulation of fire extinguishing agents>

[0128] A barrier film was prepared, consisting of a sealing layer (L-LDPE (linear low-density polyethylene) resin, 30 μm thick) and a substrate layer (PET resin with a silica vapor-deposited film, 12 μm thick). The water vapor permeability of the barrier film was 0.2–0.6 g / m³. 2 / day (40℃ / 90%RH). Two sheets of this barrier film were used to cover the sheet-like fire extinguishing body, and the four sides of the barrier film were heat-sealed, thus creating a fire extinguishing device as an evaluation sample. The heat-sealing conditions were set at 140℃ for 2 seconds.

[0129] The evaluation samples of Examples 1 to 9 and Comparative Examples 1 to 6 obtained by the above method were evaluated as follows.

[0130] <Fire Extinguishing Test>

[0131] A metal container measuring 20cm in length, 30cm in width, and 40cm in height was prepared. Circular vents with a diameter of 8.5mm were placed on each side of the container, 5cm from the top surface in the vertical direction. Similarly, circular vents with a diameter of 8.5mm were also placed on each side of the container at positions 12.5cm, 20.0cm, 27.5cm, and 35.0cm from the top surface in the vertical direction. A 50mm x 50mm fire extinguishing block was attached to the center of the top surface of the container using double-sided tape. 1.5g of solid fuel (Fire Block igniter agent manufactured by CAPTAIN STAG Co., Ltd.) measuring 15mm in length, 15mm in width, and 10mm in height was placed inside the container at a height distance of 8cm from the fire extinguishing block. The fire extinguishing block and the solid fuel were then overlapped in the vertical direction. When solid fuel was ignited, the extinguishing material's ability to extinguish the fire within 180 seconds of ignition was evaluated. The evaluation was based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0132] A: The extinguishing agent will extinguish the solid fuel fire within 180 seconds after the solid fuel is ignited.

[0133] B: The extinguishing agent failed to extinguish the solid fuel within 180 seconds after the solid fuel was ignited.

[0134] <Evaluation of Processing Adaptability>

[0135] Cuttings were performed using any cutting machine at a speed of 5 m / min with a feed interval of 190 mm. Evaluations were conducted based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0136] A: The sheet-like extinguishing agent was delivered without any deflection.

[0137] B: The cut sheet-like fire extinguishing body is bent, and the dimensional accuracy of the cut fire extinguishing body is uneven.

[0138] <Evaluation of the crack>

[0139] After the fire extinguishing structure was formed, the presence of cracks on the surface of the extinguishing layer was visually verified. An evaluation was conducted based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0140] A: No cracks were found on the surface of the fire extinguishing layer.

[0141] B: The maximum width of cracks generated on the surface of the fire extinguishing layer is less than 3mm.

[0142] C: The maximum width of cracks generated on the surface of the fire extinguishing layer is 3mm or more.

[0143]

[0144]

[0145] The fire extinguishing bodies in Examples 1-9 exhibit excellent fire extinguishing performance and processing adaptability due to their ring stiffness values ​​exceeding 50 mN and the ratio of the fire extinguishing layer thickness to the substrate layer thickness exceeding 80%. In Example 7, the calculated value obtained by subtracting the ring stiffness value of the substrate layer from the ring stiffness value of the fire extinguishing body was 0 mN. However, this calculation result was obtained when the ring stiffness value of the substrate layer dominated the ring stiffness value of the fire extinguishing body (measurement error). Therefore, the actual ring stiffness value of the fire extinguishing body excluding the substrate layer is not necessarily 0 mN. Furthermore, although cracks were generated on the surface of the fire extinguishing layer in the fire extinguishing body in Example 5, the impact of these cracks on the fire extinguishing performance and processing adaptability of the fire extinguishing body was almost negligible.

[0146] On the other hand, the fire extinguishing bodies in Comparative Examples 1-4 have poor processing adaptability because their ring stiffness value is less than 50 mN. The fire extinguishing bodies in Comparative Examples 5-6 have poor fire extinguishing performance because the ratio of the thickness of the fire extinguishing layer to the thickness of the base material layer is less than 80%.

[0147] Explanation of reference numerals in the attached figures:

[0148] 1: Substrate layer; 2: Fire extinguishing layer; 10: Fire extinguishing device; 11: Fire extinguishing body; 12: Packaging bag.

Claims

1. A fire extinguishing body, wherein, The fire extinguishing body is a sheet-like fire extinguishing body having overlapping base material layers and fire extinguishing layers. The ring stiffness value of the fire extinguishing body is above 50mN. The thickness of the fire extinguishing layer is more than 80% of the thickness of the substrate layer.

2. The fire extinguishing body according to claim 1, wherein, The value obtained by subtracting the ring stiffness value of the substrate layer from the ring stiffness value of the fire extinguishing body is less than 125mN.

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

4. The fire extinguishing body according to claim 3, wherein, Based on the total amount of the adhesive, the content of the urethane resin is 50% by mass or more.

5. A fire extinguishing device, wherein, have: The fire extinguishing body as described in claim 3; and Packaging bag, containing the fire extinguishing agent, The fire extinguishing agent is contained in the resin film included in the packaging bag.

6. The fire extinguishing body according to claim 1 or 2, wherein, The fire extinguishing layer contains fire extinguishing agent and adhesive. The adhesive comprises polyvinyl butyral resin and epoxy resin.

7. The fire extinguishing body according to claim 6, wherein, The polyvinyl butyral resin is the main component of the adhesive. Based on the total amount of the adhesive, the epoxy resin content is 5% by mass or more and 45% by mass or less.

8. A fire extinguishing device, wherein, have: The fire extinguishing body as described in claim 7; and Packaging bag, containing the fire extinguishing agent, Based on the total amount of the adhesive, the epoxy resin content is 20% by mass or more. The resin film contained in the packaging bag contains a fire extinguishing agent.

9. The fire extinguishing body according to claim 1 or 2, wherein, The substrate layer has multiple resin layers. Among the multiple resin layers, the resin layer farther away from the fire extinguishing layer has a lower melting point.

10. The fire extinguishing body according to claim 1 or 2, wherein, The thickness of the fire extinguishing body is more than 50 μm and less than 500 μm. The thickness of the substrate layer is greater than 30 μm and less than 150 μm.

11. The fire extinguishing body according to claim 1 or 2, wherein, The thickness of the fire extinguishing layer is more than 80% and less than 200% of the thickness of the substrate layer.

12. The fire extinguishing body according to claim 1 or 2, wherein, The ring stiffness of the fire extinguishing layer is above 60mN and below 200mN.

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