Fire extinguishing material and fire extinguishing material pack

Abstract

A fire extinguishing material provided with a fire extinguishing agent layer containing a fire extinguishing agent and a binder resin, in which the fire extinguishing agent contains at least one of an organic salt and an inorganic salt, and the porosity of the cross section of the fire extinguishing agent layer is 37% or less.

Description

Technical Field

[0001] The invention relates to a fire extinguishing material and a fire extinguishing material package. Background Art

[0002] In order to solve the problem of ignition or fire, Patent Document 1 proposes the use of fire extinguishing liquid and fire extinguisher. Patent Document 2 proposes an automatic fire extinguishing device dropped from a helicopter. Patent Document 3 proposes an aerosol fire extinguishing device.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open 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] Problems to be solved by the invention

[0009] Patent documents 1 to 3 all propose methods for dealing with fires after a certain period of time has passed. On the other hand, from the perspective of minimizing the damage caused by the fire, it is preferred to perform some kind of fire extinguishing work, i.e., initial fire extinguishing, at a stage shortly after the fire breaks out. Therefore, for example, a method can be considered in which a fire extinguishing material containing a fire extinguishing agent component (organic salt, inorganic salt) disclosed in the prior art is pre-existing near an object that may catch fire. Thus, it is expected that the fire extinguishing material can be used to extinguish the fire before humans perceive that the object is on fire.

[0010] Incidentally, by mixing the fire extinguishing agent component with a binder and processing it into an appropriate shape, a solid fire extinguishing material suitable for the above purpose can be obtained. However, from the viewpoint of fire extinguishing performance, such a fire extinguishing material still has room for further improvement.

[0011] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire extinguishing material having excellent fire extinguishing performance. In addition, an object of the present invention is to provide a fire extinguishing material package enclosing the fire extinguishing material.

[0012] Means for solving problems

[0013] One aspect of the present invention provides a fire extinguishing material comprising a fire extinguishing agent layer including a fire extinguishing agent and a binder resin, wherein the fire extinguishing agent includes at least one salt selected from an organic salt and an inorganic salt, and a cross-sectional porosity of the fire extinguishing agent layer is 37% or less.

[0014] In such a fire extinguishing material, the fire extinguishing agent can function properly, that is, the initial fire extinguishing can be properly implemented. The inventors speculate that this is because the heat generated by the ignition of the fire extinguishing object is easily propagated inside the fire extinguishing agent layer by reducing the gaps in the fire extinguishing agent layer to suppress the heat insulation effect brought by the gaps.

[0015] In one embodiment, the fire extinguishing agent layer may contain 70 to 97% by mass of the fire extinguishing agent based on the total amount of the fire extinguishing agent and the binder resin.

[0016] In one approach, the salt may comprise a potassium salt.

[0017] In one embodiment, the average particle size D50 of the salt may be 1 to 100 μm.

[0018] In one embodiment, the binder resin may include a polyvinyl acetal-based resin.

[0019] In one embodiment, the thickness of the fire extinguishing agent layer may be 80 to 600 μm.

[0020] In one embodiment, the fire extinguishing material may further include a resin base material on which a fire extinguishing agent layer is disposed.

[0021] One aspect of the present invention provides a fire extinguishing material package including the fire extinguishing material described above and a packaging bag enclosing the fire extinguishing material.

[0022] Effects of the Invention

[0023] According to the present invention, a fire extinguishing material having excellent fire extinguishing performance can be provided. In addition, according to the present invention, a fire extinguishing material package enclosing the fire extinguishing material can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] [ Figure 1 ] Figure 1 The present invention is a schematic cross-sectional view of a fire extinguishing material according to an embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, preferred embodiments of the present disclosure will be described in detail, but the present disclosure is not limited to the following embodiments.

[0026] <Fire extinguishing materials>

[0027] Figure 1 The fire extinguishing material 10 is a schematic cross-sectional view of a fire extinguishing material according to one embodiment. The fire extinguishing material 10 includes a fire extinguishing agent layer 1 and a resin substrate 2 on which the fire extinguishing agent layer 1 is disposed. The fire extinguishing material 10 can be considered to include a resin substrate 2 and a fire extinguishing agent layer 1 disposed on the resin substrate 2.

[0028] From the viewpoint of placing the fire extinguishing material at a desired position, the fire extinguishing material may further include a bonding layer or an adhesive layer. The bonding layer or the adhesive layer may be provided on the fire extinguishing agent layer side or on the resin base material side.

[0029] (Fire extinguishing agent layer)

[0030] The fire extinguishing agent layer contains a fire extinguishing agent and a binder resin.

[0031] As a fire extinguishing agent, a fire extinguishing agent having the so-called four elements of fire extinguishing (removal effect, cooling effect, suffocation effect, negative catalytic effect) can be appropriately used according to the fire extinguishing object. The fire extinguishing agent contains at least one salt of an organic salt and an inorganic salt that generally have fire extinguishing properties. The organic salt and the inorganic salt may have deliquescent properties.

[0032] As for the organic salt which functions as a fire extinguishing agent, potassium salt, sodium salt, ammonium salt, etc. can be cited. From the viewpoint of usefulness to the negative catalytic effect, potassium salt can be preferably used as the organic salt. As the organic potassium salt, potassium acetate, potassium citrate (tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, potassium maleate and other carboxylic acid potassium salts can be cited. Among them, potassium citrate can be used, especially from the viewpoint of the reaction efficiency of the negative catalytic effect of combustion.

[0033] Regarding the inorganic salt that functions as a fire extinguishing agent, potassium salt, sodium salt, etc. can be cited. From the viewpoint of usefulness to the negative catalytic effect, potassium salt can be preferably used as the inorganic salt. As inorganic potassium salts, potassium tetraborate, potassium carbonate, potassium hydrogen carbonate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, etc. can be cited. Among them, potassium hydrogen carbonate can be used, especially from the viewpoint of the reaction efficiency of the negative catalytic effect of combustion.

[0034] The organic salt and the inorganic salt may be used alone or in combination of two or more.

[0035] The salt may be granular. The average particle size D50 of the salt may be 1 to 100 μm, or 3 to 40 μm. By making the average particle size D50 greater than the lower limit, it is easy to disperse in the coating liquid. By making the average particle size D50 less than the upper limit, the stability in the coating liquid is improved, and the smoothness of the coating film tends to be improved. The average particle size D50 can be calculated by wet measurement using a laser diffraction particle size distribution measuring device.

[0036] The amount of the fire extinguishing agent can be set to 70-97% by mass, or 85-92% by mass, based on the total amount of the fire extinguishing agent and the binder resin (or the total amount of the fire extinguishing agent layer). By making the amount of the fire extinguishing agent below the upper limit, it is easy to suppress the deliquescence of the salt and to form a uniform fire extinguishing material. In addition, by making the amount of the fire extinguishing agent above the lower limit, it is easy to maintain sufficient fire extinguishing properties.

[0037] The fire extinguishing agent may contain other components in addition to the above-mentioned salts. As other components, for example, oxidants for improving the reactivity of the salts can be listed, and specifically, potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, magnesium chlorate, potassium nitrate, sodium nitrate, strontium nitrate, ammonium perchlorate, potassium perchlorate, basic copper nitrate, copper (I) oxide, copper (II) oxide, iron (II) oxide, iron (III) oxide, molybdenum trioxide, etc. can be listed. Among them, potassium chlorate is preferably used.

[0038] Examples of other components include colorants, antioxidants, flame retardants, inorganic fillers, fluidity-imparting agents, moisture-proofing agents, dispersants, UV absorbers, flexibility-imparting agents, catalysts, and the like.

[0039] These other components can be appropriately selected according to the type of salt and the type of binder resin. Based on the total amount of the fire extinguishing agent, the amount of other components contained in the fire extinguishing agent can be set to 40% by mass or less, 10% by mass or less, or 0% by mass.

[0040] The binder resin contains at least any one of a thermoplastic resin and a thermosetting resin as a resin.

[0041] Examples of the thermoplastic resin include polyolefin resins such as polypropylene resins, polyethylene resins, poly(1-)butene 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 (PVA), and polyvinyl acetal resins.

[0042] 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 the like; polyurethane resins, polyisocyanate resins, polyisocyanurate resins, phenolic resins, epoxy resins, polyvinyl ether (PMVE)-maleic anhydride resins, and the like.

[0043] Among the above resins, polyvinyl acetal resins can be preferably used from the viewpoint of coating film forming properties. Examples of the polyvinyl acetal resins include polyvinyl butyral (PVB) and the like.

[0044] The binder resin may contain other components in addition to the above-mentioned resins (thermoplastic resin and thermosetting resin).

[0045] Examples of other components include a curing agent and, from the viewpoint of property stability, surfactants, silane coupling agents, and anti-blocking agents.

[0046] These other components can be appropriately selected according to the type of resin. The amount of other components contained in the binder resin may be 70% by mass or less, 30% by mass or less, or 0% by mass based on the total amount of the binder resin.

[0047] The thickness of the fire extinguishing agent layer may be 80 to 600 μm, or 150 to 300 μm. When the thickness is at least the lower limit, the fire extinguishing performance is easily exhibited, and when the thickness is at most the upper limit, the coating film is easily formed and the bending resistance is good.

[0048] The area of ​​the main surface of the fire extinguishing agent layer (or also called the surface perpendicular to the stacking direction of the fire extinguishing agent layer) is adjusted according to its use, so there is no particular restriction, but it is set to be sufficiently large relative to the area of ​​the side surface. The area of ​​the main surface can be set to 10 to 624 cm 2 .

[0049] The porosity of the cross section of the fire extinguishing agent layer is 37% or less, 30% or less, 25% or less, 20% or less, 15% or less, 10% or less, or 5% or less. By making the porosity less than 37%, the heat generated by the ignition of the fire extinguishing object is easily propagated inside the fire extinguishing agent layer. Thus, the fire extinguishing agent can properly function, that is, the initial fire extinguishing can be properly implemented. In addition, in particular, by making the porosity less than 15%, this tendency is more significant. There is no particular restriction on the lower limit of the porosity, but from the viewpoint of bending resistance, it can be set to more than 1%.

[0050] The porosity refers to the area ratio of the voids based on the cross-sectional area of ​​the fire extinguishing agent layer. The porosity is measured as follows.

[0051] Utilize sharp cutter to cut off fire extinguishing material, obtain the section of the thickness direction of fire extinguishing agent layer, utilize microscope (for example VHX-1000, Keyence Corporation system) to observe this section.Observation magnification is made as 1000 times.Use image analysis software (for example ImageJ) to change the image of observed section into 16-bit image.The image after change is carried out binarization, calculates the area ratio occupied by the space when taking the cross-sectional area of ​​fire extinguishing agent layer as benchmark.This operation is carried out to 5 different sections, and the average of its area ratio is used as void ratio.

[0052] (Resin base material)

[0053] As the resin constituting the resin substrate, polyolefins (LLDPE, PP, COP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, polyimides, etc. can be cited. Even in the case where the fire extinguishing material is set in such a way that the side of the resin substrate faces the flame, if it is these resins, it will be melted by the heat of the flame (generally about 700 to 900° C.), and the fire extinguishing agent layer is easily exposed. In addition, by selecting these transparent materials, it is easy to perform an appearance inspection of the fire extinguishing agent layer and confirm the replacement period of the fire extinguishing agent layer. The above-mentioned fire extinguishing agent may also be contained in the resin substrate.

[0054] From the viewpoint of adjusting water vapor permeability, a vapor-deposited layer (aluminum oxide vapor-deposited layer or silicon dioxide vapor-deposited layer) having water vapor barrier properties may be provided on the resin substrate. The vapor-deposited layer may be provided on one surface or on both surfaces of the resin substrate.

[0055] The thickness of the resin substrate can be appropriately adjusted according to the heat, impact, allowed installation space, etc. during the expected fire. For example, if it is a thick substrate, it is easy to obtain the strength and rigidity as a fire extinguishing material, and the operation becomes easy. In addition, if it is a thin substrate, the fire extinguishing material can be set in a narrow space, and since it melts in a short time when heated by the flame, the initial fire extinguishing property is improved. The thickness of the resin substrate can be set to 4.5 to 100 μm, or 12 to 50 μm, for example. The resin substrate can also be a laminated body having a plurality of resin layers.

[0056] <Manufacturing method of fire extinguishing material>

[0057] The fire extinguishing material can be formed using a composition for forming a fire extinguishing agent layer. The composition for forming a fire extinguishing agent layer includes a fire extinguishing agent, a binder resin, and a liquid medium. The following is an example of a method for producing a fire extinguishing material.

[0058] The fire extinguishing agent and the binder resin are mixed with a liquid medium to prepare a composition for forming a fire extinguishing agent layer. As the liquid medium, an organic solvent can be listed. As the organic solvent, a water-soluble solvent can be listed, 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; glycol ethers such as N-methylpyrrolidone (NMP), tetrahydrofuran, and butyl cellosolve, etc. From the viewpoint that organic salts and inorganic salts are deliquescent, the liquid medium can be an alcohol solvent, specifically ethanol.

[0059] The amount of the fire extinguishing agent and the binder resin is adjusted so that their amount in the fire extinguishing agent layer becomes the above-mentioned desired amount. The amount of the liquid medium can be appropriately adjusted according to the method of use of the fire extinguishing agent layer forming composition, and can be set to 30 to 70% by mass based on the total amount of the fire extinguishing agent layer forming composition. The fire extinguishing agent layer forming composition containing the liquid medium can be referred to as a fire extinguishing agent layer forming coating liquid.

[0060] The fire extinguishing material can be manufactured by coating a fire extinguishing agent layer on a resin substrate with a coating liquid and drying it to form a fire extinguishing agent layer. As mentioned above, it is necessary to properly manage the voids in the fire extinguishing agent layer, but by utilizing a coating method to form the fire extinguishing agent layer, it is easy to reduce the void ratio, and the voids are easily (unbiasedly) present in the fire extinguishing agent layer. It can be considered that the fire extinguishing material having such a fire extinguishing agent layer has excellent fire extinguishing performance. It is speculated that this is the advantage of the coating method that does not apply strong external pressure when the layer is formed, and it is difficult to obtain by, for example, molding methods such as compression molding.

[0061] The coating thickness may be appropriately adjusted by taking into account the pressure applied to the fire extinguishing agent layer so as to obtain a fire extinguishing agent layer of a desired thickness.

[0062] The fire extinguishing agent layer alone may be peeled off from the resin substrate to be used as a fire extinguishing material. In this case, it is preferred that a mold release treatment be performed on the resin substrate.

[0063] The coating can be performed by a wet coating method, which includes gravure coating, comma coating, dip coating, curtain coating, spin coating, sponge roll coating, die coating, and application with a brush.

[0064] The method for manufacturing a fire extinguishing material may further include pressurizing the fire extinguishing agent layer. Thus, it is easy to further reduce the porosity. From the viewpoint of easily obtaining a desired porosity, the pressurization condition may be set to 0.2 MPa or more, or may be 2.0 MPa or more. From the viewpoint of the softness of the coating film, the upper limit of the pressurization condition may be set to 2.5 MPa or less.

[0065] <Fire extinguishing material package>

[0066] The fire extinguishing material package comprises the fire extinguishing material and a packaging bag enclosing the fire extinguishing material. By enclosing the fire extinguishing material in the packaging bag, the stability of the properties of the fire extinguishing agent layer can be further improved, and the excellent fire extinguishing performance of the fire extinguishing material can be easily maintained. The fire extinguishing material can also be decompressed and enclosed in the packaging bag.

[0067] The packaging bag can be formed, for example, by heat-sealing the four sides of two resin films. As the resin constituting the resin film, polyolefins (LLDPE, PP, COP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, polyimides, etc. can be listed. If it is these resins, they will melt by the heat of the flame (generally around 700 to 900°C), and the fire extinguishing material inside can be easily exposed. In addition, by selecting these transparent materials, it is easy to perform an appearance inspection of the fire extinguishing material and confirm the replacement period. The above-mentioned fire extinguishing agent can also be contained in the resin film.

[0068] The water vapor permeability of the resin film (according to JIS K 7129 at 40°C / 90%RH) can be designed according to the type of fire extinguishing agent and is not particularly limited, but can be set to 10.0 g / (m 2 ·day) or less, and may be 1.0g / (m 2 · days) or less.

[0069] From the viewpoint of adjusting water vapor permeability, a vapor-deposited layer (aluminum oxide vapor-deposited layer or silicon dioxide vapor-deposited layer) having water vapor barrier properties may be provided on the resin film. The vapor-deposited layer may be provided on one surface or on both surfaces of the resin film.

[0070] Fire extinguishing materials and fire extinguishing material packages can be placed on objects that may catch fire or in their vicinity. Examples of the placement method include pasting, mounting, bundling, etc. Examples of materials that may catch fire include wires, switchboards, distribution boards, control boards, batteries (lithium-ion batteries, etc.), wallpaper for building materials, ceiling materials, and other building materials, boxes for recycling lithium-ion batteries, trash cans, automobile-related parts, sockets, socket covers, and other parts.

[0071] For example, in a device provided with a fire extinguishing material or a fire extinguishing material package, initial fire extinguishing is automatically performed for a fire in the device, and therefore, such a device can be referred to as a device having an automatic fire extinguishing function.

[0072] Example

[0073] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0074] (Example 1)

[0075] Potassium chlorate (KClO3) and tripotassium citrate were crushed in an agate mortar so that the average particle size D50 was less than 12 μm. Tripotassium citrate is a deliquescent salt. 87 parts by mass were prepared, and added to a liquid medium containing 148 parts by mass of ethanol and 7 parts by mass of isopropanol together with 9 parts by mass of polyvinyl butyral resin (manufactured by Dainichi Seika Industries, Ltd.) and 4 parts by mass of silane coupling agent (X-12-1287A, manufactured by Shin-Etsu Chemical Co., Ltd.) and mixed to prepare a composition for forming a fire extinguishing agent layer.

[0076] The fire extinguishing agent layer-forming composition was applied to one surface of a polyethylene terephthalate (PET) substrate (trade name: E7002, manufactured by Toyobo Co., Ltd., thickness 50 μm) using an applicator so that the thickness of the fire extinguishing agent layer after drying would be 150 μm, and dried at 75° C. for 7 minutes to form a fire extinguishing material.

[0077] (Example 2)

[0078] A fire extinguishing material was prepared in the same manner as in Example 1 except that the thickness of the fire extinguishing agent layer was changed to 300 μm.

[0079] (Example 3)

[0080] The fire extinguishing material obtained in Example 2 was cut into 5 cm square pieces, and then pressed at 0.4 MPa in the stacking direction using a hydraulic molding machine (Toho International Inc., model: TT-5-2) to produce a fire extinguishing material.

[0081] (Example 4)

[0082] A fire extinguishing material was prepared in the same manner as in Example 3 except that the pressing condition was changed to 2.0 MPa.

[0083] (Comparative Example 1)

[0084] The fire extinguishing agent layer-forming composition was applied to one surface of a polyethylene terephthalate (PET) substrate (trade name: E7002, manufactured by Toyobo Co., Ltd., thickness 50 μm) using a sprayer so that the fire extinguishing agent layer thickness after drying would be 200 μm, and dried at 75° C. for 7 minutes to form a fire extinguishing material.

[0085] <Various Reviews>

[0086] The fire extinguishing materials obtained in each example were evaluated as follows. The results are shown in Table 1.

[0087] (Calculation of the porosity of the cross section of the fire extinguishing agent layer)

[0088] Utilize sharp cutter to cut off fire extinguishing material, obtain the section of thickness direction of fire extinguishing agent layer, utilize microscope VHX-1000 (Keyence Corporation system) to observe this section.Observation magnification is made as 1000 times.Use image analysis software ImageJ to change the image of observed section into 16-bit image.Carry out binarization to the image after change, calculate the area ratio occupied by the gap when taking the cross-sectional area of ​​fire extinguishing agent layer as reference.This operation is carried out to 5 different sections, and the average of its area ratio is used as the void ratio of the cross section of fire extinguishing agent layer.

[0089] (Fire extinguishing performance)

[0090] An ignition agent was placed on a base provided at the center of the bottom of the following iron container. In addition, the fire extinguishing material (area: 50 mm × 50 mm) obtained in each example was pasted on the inner side of the top surface of the container so that the fire extinguishing agent layer side was opposite to the ignition agent. In this state, the ignition agent was ignited to observe the fire extinguishing situation and evaluate it according to the following criteria. The distance between the fire extinguishing material and the ignition agent was adjusted by changing the height of the base.

[0091] -Iron container-

[0092] Container shape: 20cm long, 30cm wide, 40cm high cuboid. In order to prevent the fire from extinguishing naturally, five vents with a diameter of 8.5mm are opened on the sides (4 faces) of the container at heights of 5, 12.5, 20.0, 27.5, and 35.0cm from the top surface.

[0093] Ignition agent: 1.5g solid fuel (length 15mm, width 15mm, height 10mm, Captain Stag M-6710 FireBlock).

[0094] -Evaluation Criteria-

[0095] A: Able to extinguish fire at a distance of 20cm from the fire extinguishing material to the ignition agent.

[0096] B: The fire cannot be extinguished at a distance of 20 cm from the fire extinguishing material to the ignition agent, but can be extinguished at a distance of 10 cm.

[0097] C: The fire cannot be extinguished within a distance of 10 cm from the fire extinguishing material to the ignition agent.

[0098] (Flexibility)

[0099] According to JIS K 5600-5-1, the fire extinguishing material obtained in each example (area: 50 mm×50 mm) was subjected to a mandrel test. The appearance of the fire extinguishing material after the test was visually observed and evaluated according to the following criteria. It should be noted that the absence of cracks in the fire extinguishing agent layer and the absence of peeling from the PET substrate were considered to be bendable.

[0100] -Evaluation Criteria-

[0101] A: The mandrel has bendability when its diameter is 20 mm.

[0102] (Storage stability)

[0103] A barrier film (water vapor permeability of 0.2 to 0.6 g / (m2)) having a sealant layer (L-LDPE (linear low-density polyethylene) resin, thickness 30 μm) and a substrate layer (PET (polyethylene terephthalate) resin with a silica vapor-deposited layer, thickness 12 μm) was prepared. 2 · days), according to JIS K 7129 at 40°C / 90%RH. Two sheets of the barrier film were used to cover the fire extinguishing material (50 mm×50 mm) obtained in each example, and the four sides of the barrier film were heat-sealed to seal the fire extinguishing material. The heat-sealing conditions were set to 140°C and 2 seconds. This was used as an evaluation sample.

[0104] The evaluation sample was stored at 85°C / 85%RH for 10 hours, and the total light transmittance change rate was calculated from the total light transmittance of the fire extinguishing material before and after the storage. The total light transmittance was measured using a haze meter BYK-Gardner Haze-Guard Plus (manufactured by BYK).

[0105] The measurement was performed in a state where the fire extinguishing material was fixed so that the light entering the integrating sphere from the light source passed through the fire extinguishing material.

[0106] Total light transmittance change rate (%) = (total light transmittance after storage - total light transmittance before storage) / total light transmittance before storage × 100

[0107] -Evaluation Criteria-

[0108] A: The total light transmittance change rate is 50% or less.

[0109] B: The total light transmittance change rate is more than 50% and is 70% or less.

[0110] [Table 1]

[0111]

[0112] Explanation of symbols

[0113] 1…fire extinguishing agent layer, 2…resin base material, 10…fire extinguishing material.

Claims

1. A fire extinguishing material comprising a fire extinguishing agent layer comprising a fire extinguishing agent and a binder resin, The fire extinguishing agent comprises at least one of an organic salt and an inorganic salt, The porosity of the cross section of the fire extinguishing agent layer is 37% or less.

2. The fire extinguishing material according to claim 1, wherein: The fire extinguishing agent layer contains 70 to 97% by mass of the fire extinguishing agent based on the total amount of the fire extinguishing agent and the binder resin.

3. The fire extinguishing material according to claim 1 or 2, wherein: The salt comprises a potassium salt.

4. The fire extinguishing material according to any one of claims 1 to 3, wherein: The average particle size of the salt is 1 to 100 μm.

5. The fire extinguishing material according to any one of claims 1 to 4, wherein: The binder resin includes a polyvinyl acetal-based resin.

6. The fire extinguishing material according to any one of claims 1 to 5, wherein: The thickness of the fire extinguishing agent layer is 80-600 μm. 7 . The fire extinguishing material according to claim 1 , further comprising a resin substrate on which the fire extinguishing agent layer is disposed. 8 . A fire extinguishing material package comprising the fire extinguishing material according to claim 1 and a packaging bag enclosing the fire extinguishing material.

Images