Method for manufacturing fire extinguishing material and method for manufacturing fire extinguishing material package

Abstract

To provide a fire extinguishing material having excellent fire extinguishing performance.SOLUTION: There is provided a fire extinguishing material which has a fire extinguishing agent layer containing a fire extinguishing agent and a binder resin, wherein the fire extinguishing agent contains at least one of an organic salt and an inorganic salt having deliquescence and the porosity in the cross section of the fire extinguishing agent layer is 37% or less.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] All of Patent Documents 1 to 3 propose methods for dealing with a fire after a certain period of time has passed. On the other hand, from the viewpoint of minimizing damage caused by a fire, it is desirable that some fire extinguishing operation, that is, initial fire extinguishing, be performed at a stage shortly after ignition. Therefore, for example, a method of pre-existing a fire extinguishing material containing a fire extinguishing agent component (organic salt or inorganic salt) disclosed in the prior art near an object likely to catch fire can be considered. By doing so, it is expected that the fire extinguishing will be completed by the fire extinguishing material before a person senses that the object has caught fire.

[0005] By mixing a fire extinguishing agent component with a binder or the like and processing it into an appropriate shape, a solid fire extinguishing material suitable for the above purpose can be obtained. However, such a fire extinguishing material still has room for further improvement from the viewpoint of fire extinguishing performance.

[0006] This invention has been made in view of the above circumstances, and aims to provide a fire extinguishing material with excellent fire extinguishing performance. Furthermore, this invention aims to provide a fire extinguishing material package containing the said fire extinguishing material. [Means for solving the problem]

[0007] One aspect of the present invention is to provide a fire extinguishing material comprising a fire extinguishing agent layer containing a fire extinguishing agent and a binder resin, wherein the fire extinguishing agent contains at least one of an organic salt and an inorganic salt, and the porosity in the cross-section of the fire extinguishing agent layer is 37% or less. Such fire extinguishing materials allow the extinguishing agent to function properly, that is, enable effective initial fire suppression. The inventors surmise that this is because reducing the voids in the extinguishing agent layer suppresses the heat-insulating effect caused by these voids, making it easier for the heat from the ignition of the object being extinguished to propagate into the extinguishing agent layer.

[0008] 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 binder resin.

[0009] In one embodiment, the salt may contain a potassium salt.

[0010] In one embodiment, the average particle size D50 of the salt may be 1 to 100 μm.

[0011] In one embodiment, the binder resin may contain a polyvinyl acetal resin.

[0012] In one embodiment, the thickness of the fire extinguishing agent layer may be 80 to 600 μm.

[0013] In one embodiment, the fire extinguishing material may further comprise a resin substrate on which a fire extinguishing agent layer is arranged.

[0014] One aspect of the present invention is to provide a fire extinguishing material package comprising the above-mentioned fire extinguishing material and a packaging bag for enclosing the fire extinguishing material. [Effects of the Invention]

[0015] According to the present invention, a fire extinguishing material having excellent fire extinguishing performance can be provided. Further, according to the present invention, a fire extinguishing material package enclosing the fire extinguishing material can be provided.

Brief Description of the Drawings

[0016] [Figure 1] FIG. 1 is a schematic cross-sectional view of a fire extinguishing material according to an embodiment.

Mode for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments of the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments.

[0018] <Fire extinguishing material> FIG. 1 is a schematic cross-sectional view of a fire extinguishing material according to an embodiment. The fire extinguishing material 10 includes a fire extinguishing agent layer 1 and a resin base material 2 on which the fire extinguishing agent layer 1 is disposed. It can be said that the fire extinguishing material 10 includes a resin base material 2 and a fire extinguishing agent layer 1 disposed on the resin base material 2.

[0019] From the viewpoint of installing the fire extinguishing material at a desired position, the fire extinguishing material may further include an adhesive layer or an adhesive layer. The adhesive layer or the adhesive layer may be provided on the fire extinguishing agent layer side or on the resin base material side.

[0020] (Fire extinguishing agent layer) The fire extinguishing agent layer contains a fire extinguishing agent and a binder resin. As the fire extinguishing agent, those having the so-called four elements of fire extinguishing (removal action, cooling action, suffocation action, negative catalyst action) can be appropriately used according to the fire extinguishing target. The fire extinguishing agent generally contains at least one of organic salts and inorganic salts having fire extinguishing performance. The organic salts and inorganic salts may have deliquescence.

[0021] Examples of organic salts that function as fire extinguishing agents include potassium salts, sodium salts, and ammonium salts. From the viewpoint of usefulness in negative catalytic effect, potassium salts can be suitably used as organic salts. Examples of organic potassium salts include potassium carboxylate salts such as potassium acetate, potassium citrate (tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate. Of these, potassium citrate can be used in particular from the viewpoint of reaction efficiency of the negative catalytic effect of combustion.

[0022] Examples of inorganic salts that function as fire extinguishing agents include potassium salts and sodium salts. From the viewpoint of usefulness in negative catalytic effect, potassium salts can be suitably used as inorganic salts. Examples of inorganic potassium salts include potassium tetraborate, potassium carbonate, potassium bicarbonate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate. Of these, potassium bicarbonate can be used in particular from the viewpoint of reaction efficiency of the negative catalytic effect of combustion.

[0023] Organic salts and inorganic salts may be used individually or in combination of two or more types.

[0024] The salt may be granular. The average particle size D50 of the salt can be 1 to 100 μm, or it may be 3 to 40 μm. When the average particle size D50 is above the lower limit, it disperses easily in the coating liquid, and when the average particle size D50 is below the upper limit, the stability in the coating liquid improves, and the smoothness of the coating film tends to improve. The average particle size D50 can be calculated by wet measurement using a laser diffraction particle size distribution analyzer.

[0025] The amount of fire extinguishing agent can be 70-97% by mass, or 85-92% by mass, based on the total amount of fire extinguishing agent and binder resin (which may also be the total amount of the fire extinguishing agent layer). If the amount of fire extinguishing agent is below the above upper limit, it is easier to suppress deliquescence of salt and to form a uniform fire extinguishing material, and if the amount of fire extinguishing agent is above the above lower limit, it is easier to maintain sufficient fire extinguishing performance.

[0026] The fire extinguishing agent may contain other components besides the salts mentioned above. Examples of other components include oxidizing agents to improve the reactivity of the salts, 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. Among these, potassium chlorate is preferred.

[0027] Other components include colorants, antioxidants, flame retardants, inorganic fillers, fluidity enhancers, moisture-proofing agents, dispersants, UV absorbers, flexibility enhancers, and catalysts.

[0028] These other components can be appropriately selected depending on the type of salt and the type of binder resin. The amount of other components contained in the fire extinguishing agent can be 40% by mass or less, 10% by mass or less, or 0% by mass, based on the total amount of the fire extinguishing agent.

[0029] The binder resin includes at least one of a thermoplastic resin and a thermosetting resin. Examples of thermoplastic resins 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. 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), polyvulcanized rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U), and other types of rubber, as well as polyurethane resins, polyisocyanate resins, polyisocyanurate resins, phenolic resins, epoxy resins, polyvinyl ether (PMVE)-anhydrous malee resin, and the like.

[0030] Of the above resins, polyvinyl acetal resins can be suitably used from the viewpoint of film-forming properties. Examples of polyvinyl acetal resins include polyvinyl butyral (PVB).

[0031] The binder resin may contain other components besides the resins mentioned above (thermoplastic resins and thermosetting resins). Other components include curing agents, and from the standpoint of property stability, surfactants, silane coupling agents, and antiblocking agents are also used.

[0032] These other components can be appropriately selected depending on the type of resin. The amount of other components contained in the binder resin can be 70% by mass or less, 30% by mass or less, or 0% by mass, based on the total amount of the binder resin.

[0033] The thickness of the fire extinguishing agent layer can be 80 to 600 μm, or 150 to 300 μm. A thickness above the lower limit makes it easier to exhibit fire extinguishing performance, while a thickness below the upper limit makes it easier to form a coating film and provides good flexibility.

[0034] The area of ​​the main surface of the fire extinguishing agent layer (also called the surface perpendicular to the layering direction of the fire extinguishing agent layer) is not particularly limited as it is adjusted according to its intended use, but it is set to be sufficiently large compared to the area of ​​the sides. The area of ​​the main surface is, for example, 10 to 624 cm². 2 It can be done this way.

[0035] The void ratio in the cross-section of the fire extinguishing agent layer is 37% or less, but may also be 30% or less, 25% or less, 20% or less, 15% or less, 10% or less, or 5% or less. A void ratio of 37% or less allows heat from the ignition of the object being extinguished to easily propagate into the fire extinguishing agent layer. This allows the fire extinguishing agent to function properly, that is, initial fire suppression to be carried out appropriately. Furthermore, this tendency is more pronounced when the void ratio is 15% or less. There is no particular lower limit to the void ratio, but it may be 1% or more from the viewpoint of flexibility.

[0036] Void ratio refers to the ratio of void area to the cross-sectional area of ​​the fire extinguishing agent layer. The method for measuring void ratio is as follows: The fire extinguishing material is cut with a sharp blade to obtain a cross-section in the thickness direction of the fire extinguishing layer, and this cross-section is observed using a microscope (e.g., VHX-1000, manufactured by Keyence Corporation). The observation magnification is set to 1000x. The observed image of the cross-section is converted to a 16-bit image using image analysis software (e.g., ImageJ). The converted image is then binarized to calculate the area ratio occupied by voids relative to the cross-sectional area of ​​the fire extinguishing layer. This process is performed for five different cross-sections, and the average of these area ratios is taken as the void ratio.

[0037] (Resin base material) Examples of resins that make up the resin substrate include polyolefins (LLDPE, PP, COP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. Even if the fire extinguishing material is installed so that the resin substrate faces the flame, these resins will melt due to the heat of the flame (generally around 700-900°C), making it easy to expose the fire extinguishing agent layer. Furthermore, by selecting these transparent materials, it becomes easier to inspect the appearance of the fire extinguishing agent layer and to confirm when it is time to replace the fire extinguishing agent layer. The resin substrate may contain the above-mentioned fire extinguishing agents.

[0038] From the viewpoint of adjusting the water vapor permeability, the resin substrate may be provided with a vapor-deposited layer (alumina vapor-deposited layer or silica vapor-deposited layer) that has water vapor barrier properties. The vapor-deposited layer may be provided on one surface of the resin substrate or on both surfaces.

[0039] The thickness of the resin substrate can be adjusted as appropriate according to the expected heat output during a fire, the impact, and the allowable installation space. For example, a thicker substrate makes it easier to obtain the strength and rigidity required for fire extinguishing material, and facilitates handling. Conversely, a thinner substrate allows the fire extinguishing material to be installed in a narrow space, and because it melts quickly when heated by flames, initial fire extinguishing performance is improved. The thickness of the resin substrate can be, for example, 4.5 to 100 μm, or 12 to 50 μm. The resin substrate may also be a laminate comprising multiple layers of resin.

[0040] <Method of manufacturing fire extinguishing materials> 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. A method for manufacturing the fire extinguishing material is exemplified below.

[0041] A composition for forming a fire extinguishing agent layer is prepared by mixing a fire extinguishing agent and a binder resin with a liquid medium. Examples of liquid mediums include organic solvents. Examples of organic solvents include water-soluble solvents such as alcohols such as methanol, ethanol, isopropyl alcohol, and n-propyl alcohol; ketones such as acetone and methyl ethyl ketone; glycols such as ethylene glycol and diethylene glycol; and glycol ethers such as N-methylpyrrolidone (NMP), tetrahydrofuran, and butyl cellosolve. From the viewpoint that the organic and inorganic salts are hygroscopic, the liquid medium may be an alcohol-based solvent, and specifically ethanol.

[0042] The amounts of the fire extinguishing agent and binder resin should be adjusted so that their amounts in the fire extinguishing agent layer are the desired amounts described above. The amount of the liquid medium should be adjusted appropriately depending on the method of use of the fire extinguishing agent layer forming composition, but it can be 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 called a fire extinguishing agent layer forming coating liquid.

[0043] Fire extinguishing materials can be manufactured by applying a coating liquid for forming a fire extinguishing layer onto a resin substrate and drying it to form a fire extinguishing layer. As mentioned above, it is necessary to properly manage the voids in the fire extinguishing layer, but forming the fire extinguishing layer by coating makes it easier to reduce the void ratio and makes it easier for voids to be uniformly (without bias) present within the fire extinguishing layer. Fire extinguishing materials with such a fire extinguishing layer can be said to have superior fire extinguishing performance. This is an advantage unique to coating methods, which do not involve strong external pressure during layer formation, and is presumed to be difficult to obtain with molding methods such as press molding.

[0044] The coating thickness should be adjusted as appropriate, taking into account the pressurization of the fire extinguishing agent layer, to obtain a fire extinguishing agent layer of the desired thickness. The fire extinguishing agent layer may be peeled off from the resin substrate and used as a fire extinguishing material, in which case it is preferable that a release treatment is applied to the resin substrate.

[0045] The coating can be applied using a wet coating method. Examples of wet coating methods include gravure coating, comma coating, dip coating, curtain coating, spin coating, sponge roll coating, die coating, and brush painting.

[0046] The method for manufacturing the fire extinguishing material may further include pressurizing the fire extinguishing agent layer. This makes it easier to reduce the void ratio. From the viewpoint of easily obtaining the desired void ratio, the pressurizing condition can be 0.2 MPa or higher, and may also be 2.0 MPa or higher. The upper limit of the pressurizing condition can be 2.5 MPa or lower from the viewpoint of the flexibility of the coating film.

[0047] <Fire extinguishing material package> The fire extinguishing material package comprises the fire extinguishing material described above and a packaging bag for sealing the fire extinguishing material. Sealing the fire extinguishing material in a packaging bag can further improve the stability of the properties of the fire extinguishing agent layer, making it easier to maintain the excellent fire extinguishing performance of the fire extinguishing material. The fire extinguishing material may also be sealed in the packaging bag under reduced pressure.

[0048] The packaging bag can be formed, for example, by heat-sealing the four sides of two resin films. Examples of resins that make up the resin film include polyolefins (LLDPE, PP, COP, CPP, etc.), polyesters (PET, etc.), fluororesins (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. These resins melt when exposed to the heat of a flame (generally around 700-900°C), making it easy to expose the fire extinguishing material inside. Furthermore, by selecting these transparent materials, it becomes easier to visually inspect the fire extinguishing material and to check when it needs to be replaced. The resin film may contain the above-mentioned fire extinguishing agent.

[0049] The water vapor permeability of the resin film (according to JIS K 7129, under 40°C / 90%RH conditions) is not particularly limited as it can be designed according to the type of fire extinguishing agent, but 10.0 g / (m 2 It can be less than or equal to 1.0g / (m 2It may be less than or equal to (day).

[0050] From the viewpoint of adjusting the water vapor permeability, the resin film may be provided with a vapor-deposited layer (alumina vapor-deposited layer or silica vapor-deposited layer) that has water vapor barrier properties. The vapor-deposited layer may be provided on one surface of the resin film or on both surfaces.

[0051] Fire extinguishing materials and fire extinguishing material packages can be installed on or near objects that may ignite. Installation methods include attaching, placing, and including in packages. Examples of objects that may ignite include electrical wires, distribution boards, switchboards, control panels, storage batteries (lithium-ion batteries, etc.), building materials such as wallpaper and ceiling materials, lithium-ion battery collection boxes, trash cans, automotive-related parts, electrical outlets, and outlet covers. For example, in a device equipped with fire extinguishing material or a fire extinguishing material package, initial fire suppression is performed automatically in the event of ignition in the device. Therefore, such a device can be described as having an automatic fire suppression function.

[0052] <Summary of this embodiment> [Invention 1] It comprises a fire extinguishing agent layer containing a fire extinguishing agent and a binder resin, The fire extinguishing agent contains at least one salt of an organic salt and an inorganic salt, A fire extinguishing material in which the void ratio in the cross-section of the fire extinguishing agent layer is 37% or less. [Invention 2] The fire extinguishing material according to Invention 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. [Invention 3] The fire extinguishing material according to invention 1 or 2, wherein the salt contains a potassium salt. [Invention 4] The fire extinguishing material according to any one of Inventions 1 to 3, wherein the average particle size of the salt is 1 to 100 μm. [Invention 5] The fire extinguishing material according to any one of Inventions 1 to 4, wherein the binder resin comprises a polyvinyl acetal resin. [Invention 6] The fire extinguishing material according to any one of Inventions 1 to 5, wherein the thickness of the fire extinguishing agent layer is 80 to 600 μm. [Invention 7] The fire extinguishing material according to any one of inventions 1 to 6, further comprising a resin substrate on which the fire extinguishing agent layer is arranged. [Invention 8] A fire extinguishing material package comprising a fire extinguishing material according to any one of inventions 1 to 7, and a packaging bag for enclosing the fire extinguishing material. [Examples]

[0053] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0054] (Example 1) Potassium chlorate (KClO3) and tripotassium citrate were ground in an agate mortar until the average particle size D50 was 12 μm or less. Tripotassium citrate is a hygroscopic salt. 87 parts by mass of this mixture were prepared and added to a liquid medium containing 148 parts by mass of ethanol and 7 parts by mass of isopropyl alcohol, along with 9 parts by mass of polyvinyl butyral resin (manufactured by Dainichi Seika Kogyo Co., 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 fire extinguishing agent layer-forming composition.

[0055] A fire extinguishing agent layer-forming composition was applied to one side of a polyethylene terephthalate (PET) substrate (product name: E7002, manufactured by Toyobo Co., Ltd., thickness 50 μm) using an applicator so that the fire extinguishing agent layer thickness after drying would be 150 μm, and the material was dried at 75°C for 7 minutes to form a fire extinguishing agent.

[0056] (Example 2) Except for setting the thickness of the fire extinguishing agent layer to 300 μm, the fire extinguishing material was prepared in the same manner as in Example 1.

[0057] (Example 3) After cutting the fire extinguishing material obtained in Example 2 into 5 cm squares, the fire extinguishing material was pressed in its stacking direction at a pressure of 0.4 MPa using a hydraulic molding machine (Toho International, Model: TT-5-2) to produce fire extinguishing material.

[0058] (Example 4) Except for setting the pressing conditions to 2.0 MPa, the fire extinguishing material was prepared in the same manner as in Example 3.

[0059] (Comparative Example 1) A fire extinguishing agent was formed by spraying a fire extinguishing agent layer-forming composition onto one side of a polyethylene terephthalate (PET) substrate (product name: E7002, manufactured by Toyobo Co., Ltd., thickness 50 μm) so that the fire extinguishing agent layer thickness after drying would be 200 μm, and then drying at 75°C for 7 minutes.

[0060] <Various evaluations> The fire extinguishing materials obtained in each case were evaluated as follows. The results are shown in Table 1.

[0061] (Calculation of void ratio in the cross-section of the fire extinguishing agent layer) The fire extinguishing material was cut with a sharp blade to obtain a cross-section in the thickness direction of the fire extinguishing agent layer, and this cross-section was observed using a VHX-1000 microscope (manufactured by Keyence Corporation). The observation magnification was set to 1000x. The observed cross-sectional image was converted to a 16-bit image using the image analysis software ImageJ. The converted image was then binarized, and the area ratio occupied by voids relative to the cross-sectional area of ​​the fire extinguishing agent layer was calculated. This process was performed for five different cross-sectional surfaces, and the average of these area ratios was taken as the void ratio in the cross-section of the fire extinguishing agent layer.

[0062] (Fire extinguishing performance) An igniter was placed on a base located in the center of the bottom of the iron container shown below. Additionally, the extinguishing material (area: 50mm x 50mm) obtained in each example was attached to the inside of the top surface of the container, with the extinguishing material layer facing the igniter. The igniter was then ignited, and the extinguishing process was observed and evaluated according to the following criteria. The distance between the extinguishing material and the igniter was adjusted by changing the height of the base. - Iron container - Container shape: A rectangular prism measuring 20cm in length, 30cm in width, and 40cm in height. To prevent the fire from extinguishing naturally, five 8.5mm diameter ventilation holes were made on each of the four sides of the container at heights of 5cm, 12.5cm, 20.0cm, 27.5cm, and 35.0cm from the top surface. Fire starter: 1.5g solid fuel (15mm long, 15mm wide, 10mm high, Captain Stag M-6710 Fire Block). -Evaluation Criteria- A: The fire can be extinguished with a distance of 20 cm between the extinguishing agent and the igniter. B: The fire cannot be extinguished if the distance from the extinguishing material to the igniter is 20 cm, but it can be extinguished if the distance is 10 cm. C: The fire cannot be extinguished when the distance from the extinguishing material to the ignition agent is 10 cm.

[0063] (flexibility) Mandrel tests were performed on the fire extinguishing materials (area: 50 mm x 50 mm) obtained in each example, in accordance with JIS K5600-5-1. The appearance of the fire extinguishing materials after the tests was visually observed and evaluated according to the following criteria. Flexibleness was defined as the absence of cracks in the fire extinguishing agent layer and peeling from the PET substrate. -Evaluation Criteria- A: The mandrel is flexible at a diameter of 20 mm.

[0064] (Storage stability) A barrier film comprising a sealant layer (L-LDPE (linear low-density polyethylene) resin, 30 μm thick) and a base layer (PET (polyethylene terephthalate) resin with a silica vapor deposition layer, 12 μm thick) (water vapor transmission rate 0.2~0.6 g / (m²) 2 A barrier film was prepared (under JIS K 7129 conditions of 40°C / 90%RH). Two of these barrier films were used to cover the fire extinguishing material (50mm x 50mm) obtained in each example, and the fire extinguishing material was sealed by heat sealing all four sides of the barrier film. The heat sealing conditions were 140°C for 2 seconds. This was used as the evaluation sample.

[0065] The evaluation samples were stored at 85°C / 85%RH for 10 hours, and the rate of change in total light transmittance was calculated from the total light transmittance of the fire extinguishing material before and after storage. A haze meter, BYK-Gardner Haze-Guard Plus (manufactured by BYK), was used to measure the total light transmittance. The measurement was performed with the fire extinguishing material fixed in place so that light entering the integrating sphere from the light source would pass through the fire extinguishing material. Change in total light transmittance (%) = (Total light transmittance after storage - Total light transmittance before storage) / Total light transmittance before storage × 100 -Evaluation Criteria- A: The change rate of total light transmittance was 50% or less. B: The change rate of total light transmittance was between 50% and 70%.

[0066] [Table 1] [Explanation of Symbols]

[0067] 1...Fire extinguishing agent layer, 2...Resin base material, 10...Fire extinguishing material.

Claims

1. A fire extinguishing agent layer forming composition comprising a fire extinguishing agent, a binder resin, and a liquid medium, comprising the step of applying the composition to a resin substrate to form a fire extinguishing agent layer on the resin substrate, The fire extinguishing agent layer comprises the fire extinguishing agent and the binder resin, The fire extinguishing agent contains an organic potassium salt, and the average particle size D50 of the organic potassium salt is 1 to 100 μm. 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. A method for manufacturing a fire extinguishing material, wherein the void ratio in the cross-section of the fire extinguishing agent layer is 37% or less.

2. The manufacturing method according to claim 1, wherein the coating is performed by a wet coating method.

3. The manufacturing method according to claim 1, further comprising the step of pressurizing the formed fire extinguishing agent layer.

4. A method for manufacturing a fire extinguishing material package, comprising the step of sealing a fire extinguishing material manufactured by the manufacturing method described in any one of Claims 1 to 3 into a packaging bag.

5. The manufacturing method according to claim 4, wherein the packaging bag is made by heat-sealing a resin film.

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