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 a deliquescent organic salt and an inorganic salt, and the surface of the fire extinguishing agent layer has an arithmetic average roughness Ra of 1.3 [mu] m or less or a 60-degree glossiness of 2.7 or more.

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 extinguishing agent component with a binder and processing it into an appropriate shape, a solid extinguishing material suitable for the above purpose can be obtained. However, from the perspective of the stability of the properties of the extinguishing agent component, such a 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 stability in properties of a fire extinguishing agent. 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 of a deliquescent organic salt and an inorganic salt, and the fire extinguishing agent layer has an arithmetic mean roughness Ra of 1.3 μm or less.

[0014] Such fire extinguishing materials have excellent stability in properties of the extinguishing agent, so that even after a period of time, initial fire extinguishing can be properly implemented. In this regard, the inventors speculate that this is because the roughness of the extinguishing agent layer surface is suppressed to reduce the contact area between the extinguishing agent and the atmosphere, thereby suppressing the deterioration of the extinguishing agent.

[0015] Another 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 of a deliquescent organic salt and an inorganic salt, and the surface of the fire extinguishing agent layer has a 60 degree glossiness of 2.7 or more.

[0016] Such fire extinguishing materials have excellent stability in properties of the extinguishing agent, so that even after a period of time, initial fire extinguishing can be properly implemented. In this regard, the inventors speculate that this is because the contact area between the extinguishing agent and the atmosphere is reduced by increasing the glossiness of the extinguishing agent layer surface (i.e., suppressing the roughness), thereby suppressing the deterioration of the extinguishing agent.

[0017] 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.

[0018] In one approach, the salt may comprise a potassium salt.

[0019] In one embodiment, the average particle size D50 of the salt may be 1 to 100 μm.

[0020] In one embodiment, the binder resin may include a polyvinyl acetal-based resin.

[0021] In one embodiment, the thickness of the fire extinguishing agent layer may be 80 to 600 μm.

[0022] In one embodiment, the fire extinguishing material may further include a resin base material on which a fire extinguishing agent layer is disposed.

[0023] 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.

[0024] Effects of the Invention

[0025] According to the present invention, a fire extinguishing material having excellent stability in properties of a fire extinguishing agent 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

[0026] [ Figure 1 ] Figure 1 The present invention is a schematic cross-sectional view of a fire extinguishing material according to an embodiment. DETAILED DESCRIPTION

[0027] Hereinafter, preferred embodiments of the present disclosure will be described in detail, but the present disclosure is not limited to the following embodiments.

[0028] <Fire extinguishing materials>

[0029] 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.

[0030] 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.

[0031] (Fire extinguishing agent layer)

[0032] The fire extinguishing agent layer contains a fire extinguishing agent and a binder resin.

[0033] As the fire extinguishing agent, a fire extinguishing agent having the so-called four elements of fire extinguishing (removal, cooling, suffocation, negative catalytic effect) can be appropriately used according to the fire extinguishing object. The fire extinguishing agent generally contains at least one salt of organic salt and inorganic salt having deliquescent properties and having fire extinguishing performance.

[0034] 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.

[0035] 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.

[0036] The organic salt and the inorganic salt may be used alone or in combination of two or more.

[0037] The salt may be granular. The average particle size D50 of the salt may be set to 1 to 100 μm, or 3 to 40 μm. By making the average particle size D50 greater than the above lower limit, it is easy to disperse in the coating liquid. By making the average particle size D50 less than the above upper limit, the stability in the coating liquid is improved, thereby the smoothness of the coating film tends to be improved, and it is easy to achieve the desired arithmetic mean roughness or glossiness of the surface of the fire extinguishing agent layer. The average particle size D50 can be calculated by wet measurement using a laser diffraction particle size distribution measuring device.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The binder resin contains at least any one of a thermoplastic resin and a thermosetting resin as a resin.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The binder resin may contain other components in addition to the above-mentioned resins (thermoplastic resin and thermosetting resin).

[0047] Examples of other components include a curing agent and, from the viewpoint of property stability, surfactants, silane coupling agents, and anti-blocking agents.

[0048] 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.

[0049] 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.

[0050] The area of ​​the main surface of the fire extinguishing agent layer is adjusted according to its use and is not particularly limited, but is set to be sufficiently larger than the area of ​​the side surface. The area of ​​the main surface can be, for example, 10 to 624 cm 2 .

[0051] The arithmetic mean roughness Ra of the surface of the fire extinguishing agent layer is 1.3 μm or less, 1.1 μm or less, 1.0 μm or less, 0.9 μm or less, or 0.7 μm or less. By making Ra less than 1.3 μm, the roughness of the surface of the fire extinguishing agent layer can be suppressed, and the contact area between the fire extinguishing agent and the atmosphere can be reduced. Thus, the deterioration of the fire extinguishing agent layer mainly caused by the deliquescence of the fire extinguishing agent can be suppressed, that is, even after a period of time, the initial fire extinguishing can be properly implemented. There is no particular restriction on the lower limit of Ra, but from the perspective of the difficulty of film transportation, it can be set to 0.1 μm or more.

[0052] The arithmetic mean roughness Ra is a value measured according to JIS B 0601 and JIS B 0031. Ra is measured on the surface of the fire extinguishing agent layer (i.e., also referred to as the main surface of the fire extinguishing agent layer or the surface perpendicular to the stacking direction of the fire extinguishing agent layer) using a contact surface roughness meter (Mitutoyo, model: SJ-210) or the like. Ra is measured at 5 different points on the surface of the fire extinguishing agent layer, and the average is taken as Ra of the fire extinguishing agent layer.

[0053] The 60-degree glossiness of the surface of the fire extinguishing agent layer is 2.7 or more, 2.8 or more, 2.9 or more, 2.95 or more, or 3.0 or more. A 60-degree glossiness of 2.7 or more means that the roughness of the surface of the fire extinguishing agent layer is suppressed, thereby reducing the contact area between the fire extinguishing agent and the atmosphere. Thus, the deterioration of the fire extinguishing agent layer mainly caused by the deliquescence of the fire extinguishing agent can be suppressed, that is, even after a period of time, the initial fire extinguishing can be properly implemented. There is no particular upper limit to the 60-degree glossiness, but from the perspective of the difficulty of film transportation, it can be set to 30 or less.

[0054] The 60-degree glossiness is a value measured according to JIS Z8741. The glossiness is measured on the surface of the fire extinguishing agent layer using a gloss meter (trade name: RHOPOINT IQ, manufactured by RHOPOINTS). The glossiness is measured at three different points on the surface of the fire extinguishing agent layer, and the average is taken as the glossiness of the fire extinguishing agent layer.

[0055] The surface of the fire extinguishing agent layer refers to the main surface of the fire extinguishing agent layer (or also referred to as the surface perpendicular to the stacking direction of the fire extinguishing agent layer). The deliquescence of the fire extinguishing agent gradually proceeds from the surface of the fire extinguishing agent layer exposed to the atmosphere. Compared with the side surface of the fire extinguishing agent layer with a small contact surface with the atmosphere, the deliquescence is more likely to proceed from the main surface of the fire extinguishing agent layer with a large contact surface with the atmosphere. Therefore, by properly managing the Ra or glossiness of the main surface of the fire extinguishing agent layer, the deliquescence of the fire extinguishing agent can be suppressed, and a fire extinguishing material with excellent property stability can be obtained.

[0056] When the fire extinguishing material has a fire extinguishing agent layer alone, when the fire extinguishing agent layer has a first surface (front surface) and a second surface (back surface), it is sufficient to make the Ra of the first surface and the second surface less than 1.3 μm, or the 60 degree glossiness greater than 2.7.

[0057] In the case where the fire extinguishing material includes a resin substrate and a fire extinguishing agent layer disposed on the resin substrate, it is sufficient to set the Ra of at least the surface of the fire extinguishing agent layer on the side opposite to the resin substrate to 1.3 μm or less, or set the 60-degree glossiness to 2.7 or more. Although the surface of the fire extinguishing agent layer on the resin substrate side is protected by the resin substrate (not exposed to the atmosphere), the Ra of the surface of the fire extinguishing agent layer on the resin substrate side is preferably 1.3 μm or less, or set the 60-degree glossiness to 2.7 or more.

[0058] (Resin base material)

[0059] 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.

[0060] 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.

[0061] 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.

[0062] <Manufacturing method of fire extinguishing material>

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The fire extinguishing material can be manufactured by coating a coating liquid for forming a fire extinguishing agent layer on a resin substrate and drying it to form a fire extinguishing agent layer. As mentioned above, on the surface of the fire extinguishing agent layer exposed to the atmosphere, it is necessary to properly manage the Ra or glossiness, but by forming the fire extinguishing agent layer by a coating method, the surface / back side of the fire extinguishing agent layer can easily achieve appropriate Ra or glossiness. It is speculated that this is an advantage of the coating method that does not apply strong external pressure when the layer is formed, which is difficult to obtain by molding methods such as compression molding.

[0067] 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.

[0068] 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.

[0069] The coating can be performed by a wet coating method, and examples of the wet coating method include a gravure coating method, a comma coating method, a dip coating method, a curtain coating method, a spin coating method, a sponge roll method, and a die coating method.

[0070] The method for manufacturing a fire extinguishing material may further include pressurizing the fire extinguishing agent layer. Thus, it is easy to further reduce Ra or further improve glossiness. From the viewpoint of easily obtaining the desired Ra or glossiness, 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.

[0071] <Fire extinguishing material package>

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Example

[0079] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0080] (Example 1)

[0081] 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.

[0082] 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.

[0083] (Example 2)

[0084] A metal flat plate was pressed onto the fire extinguishing agent layer of the fire extinguishing material obtained in Example 1 under a condition of 0.4 MPa to produce a fire extinguishing material.

[0085] (Comparative Example 1)

[0086] A nylon mesh (mesh size: 85 μm) was pressed onto the fire extinguishing agent layer of the fire extinguishing material obtained in Example 1 under a condition of 0.4 MPa to produce a fire extinguishing material.

[0087] (Comparative Example 2)

[0088] A fire extinguishing material was obtained in the same manner as in Example 1 except that acrylic resin was used instead of polyvinyl butyral resin. A nylon net (mesh size 250 μm) was pressed against the fire extinguishing agent layer of the fire extinguishing material under a condition of 0.4 MPa to produce the fire extinguishing material.

[0089] (Comparative Example 3)

[0090] A nylon mesh (mesh size 250 μm) was pressed onto the fire extinguishing agent layer of the fire extinguishing material obtained in Example 1 under a condition of 0.4 MPa to produce a fire extinguishing material.

[0091] (Comparative Example 4)

[0092] A nylon mesh (mesh size 250 μm) was pressed onto the fire extinguishing agent layer of the fire extinguishing material obtained in Example 1 under a condition of 2.0 MPa to produce a fire extinguishing material.

[0093] (Comparative Example 5)

[0094] The fire extinguishing agent layer-forming composition prepared in Example 1 was applied to one surface of a polyethylene terephthalate (PET) substrate (trade name: S10, manufactured by Toray Industries, Inc.) using a sprayer so that the fire extinguishing agent layer thickness after drying became 150 μm, and dried at 75° C. for 7 minutes to form a fire extinguishing material.

[0095] <Various Reviews>

[0096] The fire extinguishing materials obtained in each example were evaluated as follows. The results are shown in Tables 1 and 2.

[0097] (Measurement of arithmetic mean roughness Ra)

[0098] The arithmetic mean roughness Ra of the surface (the surface opposite to the PET substrate) of the fire extinguishing agent layer of the fire extinguishing material obtained in each example was measured using a contact surface roughness meter (Mitutoyo, model: SJ-210) according to JIS B 0601 and JIS B 0031. Ra was measured at 5 different points on the surface of the fire extinguishing agent layer, and the average was taken as Ra of the fire extinguishing agent layer.

[0099] (60 degree gloss measurement)

[0100] The 60-degree glossiness of the surface of the fire extinguishing agent layer (the surface opposite to the PET substrate) of the fire extinguishing material obtained in each example was measured using a gloss meter (trade name: RHOPOINT IQ, manufactured by RHOPOINTS) according to JIS Z8741. The glossiness was measured at three different points on the surface of the fire extinguishing agent layer, and the average was taken as the glossiness of the fire extinguishing agent layer.

[0101] (Stability of properties of fire extinguishing agents)

[0102] 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.

[0103] 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).

[0104] 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.

[0105] Total light transmittance change rate (%) = (total light transmittance after storage - total light transmittance before storage) / total light transmittance before storage × 100

[0106] -Evaluation Criteria-

[0107] A: The total light transmittance change rate is less than 30%.

[0108] B: The total light transmittance change rate is 30 to 50%.

[0109] C: The total light transmittance change rate exceeds 50%.

[0110] [Table 1]

[0111]

[0112] [Table 2]

[0113]

[0114] Explanation of symbols

[0115] 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 a deliquescent organic salt and an inorganic salt, The arithmetic mean roughness Ra of the surface of the fire extinguishing agent layer is 1.3 μm or less.

2. 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 a deliquescent organic salt and an inorganic salt, The 60-degree glossiness of the surface of the fire extinguishing agent layer is greater than 2.

7.

3. The fire extinguishing material according to claim 1 or 2, 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.

4. The fire extinguishing material according to any one of claims 1 to 3, wherein: The salt comprises a potassium salt.

5. The fire extinguishing material according to any one of claims 1 to 4, wherein: The average particle size D50 of the salt is 1 to 100 μm.

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

7. The fire extinguishing material according to any one of claims 1 to 6, wherein: The thickness of the fire extinguishing agent layer is 80-600 μm. 8 . The fire extinguishing material according to claim 1 , further comprising a resin substrate on which the fire extinguishing agent layer is disposed. 9 . A fire extinguishing material package comprising the fire extinguishing material according to claim 1 and a packaging bag enclosing the fire extinguishing material.

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