Fire-extinguishing film and its manufacturing method, fire-extinguishing composition, fire-extinguishing sheet, and fire-extinguishing molded product

Abstract

To provide a method for efficiently manufacturing a fire extinction film allowing easy installation at a location with a likelihood of inflammation and capable of exerting an excellent effect in an initial fire extinction at inflammation.SOLUTION: A manufacturing method of a fire extinction film includes: (A) a step of kneading a thermoplastic resin and slurry or powder containing a fire-extinguishing agent configured to generate aerosol by burning, to obtain a kneaded product of a fire extinction composition; and (B) a step of molding the kneaded product.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire-extinguishing film and a method for producing the same, a fire-extinguishing composition, a fire-extinguishing sheet, and a fire-extinguishing molded article. [Background technology]

[0002] In recent years, technological advances have made our lives more comfortable, but at the same time, large amounts of energy are required to create that comfort. High levels of safety are required in the handling of energy in each scenario, such as when large amounts of energy are densely packed and stored, transported, and used.

[0003] Taking automobiles as an example, there is a risk of fire when mining fossil fuels, refining gasoline from fossil fuels, transporting gasoline, burning gasoline in the engine, etc. Taking electronics as an example, there is a similar risk of fire when transferring electrical energy through power lines, adjusting electrical energy in substations and transformers, using electrical energy in electrical devices in homes and factories, or temporarily storing it in batteries, etc.

[0004] To address the problem of ignition and fire, Patent Document 1 proposes the use of fire extinguishing liquid and a fire extinguisher. Patent Document 2 proposes an automatic fire extinguishing device dropped from a helicopter. Patent Document 3 proposes an aerosol fire extinguishing device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-276440 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-6302 [Patent Document 3] Japanese Patent Application Publication No. 2017-080023 Summary of the Invention [Problem to be solved by the invention]

[0006] While all of the prior art proposes methods for dealing with a fire after a certain amount of time has passed, from the perspective of minimizing damage caused by a fire, it is desirable to carry out some kind of fire-fighting operation (initial fire extinguishing) immediately after the fire has started.

[0007] Therefore, for example, a method of pre-existing the components of a fire extinguishing agent disclosed in the prior art near an object at risk of ignition is conceivable. By doing so, it is expected that the components of the fire extinguishing agent will be able to completely extinguish the fire before a person senses that the object has ignited. However, it is necessary to address the problem that fire extinguishing agents placed in open spaces deteriorate over time. In addition, it is obviously not realistic to simply spray the fire extinguishing agent near the object; it is necessary to provide the extinguishing agent near the object in a form that is reasonably easy to handle.

[0008] The present invention has been made in view of the above circumstances, and provides a fire-extinguishing film that can be easily installed in areas where there is a risk of fire and that is highly effective in extinguishing a fire in the early stages of the outbreak, as well as a method for efficiently producing the same. The present invention also provides a fire-extinguishing composition, a fire-extinguishing sheet, and a fire-extinguishing molded product that have excellent fire-extinguishing performance. [Means for solving the problem]

[0009] A method for producing a fire-extinguishing film according to one aspect of the present invention includes: (A) a step of obtaining a kneaded mixture of a fire-extinguishing composition by kneading a slurry or powder containing a fire-extinguishing agent component that generates an aerosol upon combustion with a thermoplastic resin; and (B) a step of molding the kneaded mixture.

[0010] By forming a layer made of the kneaded material by extrusion molding in step (B), a fire-extinguishing film with excellent fire-extinguishing performance can be efficiently produced. According to the inventors' studies, by preparing a kneaded material in which the components are sufficiently uniformly mixed in step (A), a fire-extinguishing film that stably exhibits excellent fire-extinguishing performance can be produced. Specifically, it is preferable to form a 100 μm-thick layer made of the fire-extinguishing composition, and to knead the slurry and thermoplastic resin in step (A) so that the standard deviation of 15 haze measurements obtained by measuring the haze at 15 locations within an area of 150 mm length x 150 mm width is 2.0 or less.

[0011] A fire-extinguishing composition according to one aspect of the present invention comprises a fire-extinguishing agent component that generates an aerosol upon combustion and a thermoplastic resin, forms a 100 μm-thick layer of the fire-extinguishing composition, and measures haze at 15 locations within an area of 150 mm length x 150 mm width, with the standard deviation of 15 measurements being 2.0 or less. A standard deviation of 2.0 or less for the haze measurements at 15 locations means that the components contained in the fire-extinguishing composition are sufficiently uniformly mixed.

[0012] The fire extinguishing agent component in the fire extinguishing composition contains, for example, at least an inorganic oxidizing agent that burns together with the thermoplastic resin to generate thermal energy, and a radical generator, and the decomposition starting temperature of the radical generator is in the range of 90°C to 260°C. Such a fire extinguishing agent component has excellent fire extinguishing performance. The fire extinguishing agent component contains, for example, at least one of a potassium salt and a sodium salt as the radical generator.

[0013] One aspect of the present invention provides various articles comprising at least one layer comprising the above-described fire-extinguishing composition. Examples of such articles include fire-extinguishing films and fire-extinguishing sheets. Further specific examples of fire-extinguishing films include shrink films (films obtained by biaxially or uniaxially stretching a fire-extinguishing sheet or a fire-extinguishing film) and stretch films (films obtained by processing a fire-extinguishing film into a thin film). From the viewpoint of ease of installation in locations where there is a risk of fire, the fire-extinguishing films and fire-extinguishing sheets may further comprise a pressure-sensitive adhesive layer or an adhesive layer on at least one surface of the layer comprising the fire-extinguishing composition. Another aspect of the present invention provides a fire-extinguishing molded product comprised of the above-described fire-extinguishing composition. [Effects of the Invention]

[0014] The present invention provides a fire-extinguishing film that can be easily installed in areas where there is a risk of fire and that is highly effective in extinguishing a fire in its early stages, as well as a method for efficiently producing the same. The present invention also provides a fire-extinguishing composition, a fire-extinguishing sheet, and a fire-extinguishing molded product that have excellent fire-extinguishing performance. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view schematically showing one embodiment of the fire extinguishing film according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view schematically showing the fire extinguishing film shown in FIG. 1 in use. [Figure 3] FIG. 3 is a cross-sectional view schematically showing another embodiment of the fire extinguishing film according to the present invention. [Figure 4] FIG. 4 is a cross-sectional view schematically showing the fire extinguishing film shown in FIG. 3 in use. [Figure 5] 5(a) and 5(b) are cross-sectional views schematically showing other embodiments of the fire extinguishing film according to the present invention. [Figure 6] FIG. 6 is a cross-sectional view schematically showing another embodiment of the fire extinguishing film according to the present invention. [Figure 7]FIG. 7 is a plan view schematically showing one embodiment of the fire extinguisher molding according to the present invention. [Figure 8] FIG. 8 is a plan view schematically showing an example of a location where haze is measured on a sample of a fire extinguishing film (150 mm long x 150 mm wide). DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments. In the following embodiments, a fire-extinguishing film (wherein the thickness of the fire-extinguishing agent-containing layer is, for example, 1 mm or less) will be exemplified as an article having at least one fire-extinguishing agent-containing layer (a layer made of a fire-extinguishing composition).

[0017] <Fire extinguishing film> 1 is a schematic cross-sectional view of a fire-extinguishing film according to this embodiment. Fire-extinguishing film 10 is a single-layer film consisting of a fire-extinguishing agent-containing layer 1. Fire-extinguishing film 10 is a film produced by cast molding, inflation molding, calendar molding, or the like.

[0018] FIG. 2 is a schematic cross-sectional view showing how the fire-extinguishing film 10 is used. As shown in FIG. 2, the fire-extinguishing film 10 is used in a state facing an object X that may ignite. If a fire breaks out at the object X, the pre-installed fire-extinguishing film 10 will initially extinguish the fire. The object X is not particularly limited as long as it is flammable and has a surface (flat or curved) on which the fire-extinguishing film 10 can be placed. Examples of the object X include electric wires, distribution boards, control panels, storage batteries (lithium ion batteries, etc.), recycling boxes, trash cans, automobile-related components, and electrical outlets. The fire-extinguishing film 10 can also be used as a shrink film or stretch film by selecting a thermoplastic resin and processing it (e.g., by stretching or thinning).

[0019] The fire extinguishing agent-containing layer 1 is a layer containing a fire extinguishing agent component and a thermoplastic resin. The fire extinguishing agent component generates an aerosol when burned. The fire extinguishing agent component contains, for example, at least an inorganic oxidizing agent and a radical generator. The radical generator has the effect of stabilizing combustion radicals and suppressing the chain reaction of combustion (negative catalytic action).

[0020] The thickness of the fire extinguishing agent-containing layer 1 may be appropriately set depending on the fire to be extinguished, the installation location, and the amount of fire extinguishing agent component to be blended. The thickness of the fire extinguishing agent-containing layer 1 may be, for example, 1 mm or less, and may be 20 to 800 μm, or may be 50 to 400 μm.

[0021] The content of the extinguishing agent component in the extinguishing agent-containing layer 1 (based on the mass of the extinguishing agent-containing layer 1) is, for example, 30 to 80 mass %, preferably 40 to 75 mass %, and more preferably 50 to 70 mass %. When the content of the extinguishing agent component is 30 mass % or more, excellent fire extinguishing performance can be achieved, while when it is 80 mass % or less, film formability can be achieved. The amount of the extinguishing agent component per unit area may be set depending on the target to be extinguished. For example, for a small fire such as a fire extinguishing agent, 15 g / m 2 It is sufficient if the heating power is 30g / m for 1g of solid fuel. 2 For large fires and fires from lithium-ion batteries, the standard is 250g / m 2 It is preferable that this is equal to or greater than this.

[0022] [Fire extinguishing agent ingredients] As described above, the fire extinguishing agent-containing layer 1 contains an inorganic oxidizing agent and a radical generating agent as fire extinguishing agent components. These components will be described below.

[0023] The inorganic oxidizing agent (hereinafter sometimes referred to as "component (A)") is a component that burns together with the thermoplastic resin to generate thermal energy. Examples of inorganic oxidizing agents include potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, and magnesium chlorate. One of these may be used alone, or two or more may be used in combination.

[0024] The radical generator (hereinafter sometimes referred to as "component (B)") is a component for generating an aerosol (radicals) by thermal energy generated by the combustion of a thermoplastic resin and an inorganic oxidizing agent. It is preferable to use a radical generator whose decomposition starting temperature is in the range of 90°C to 260°C. Examples of the radical generator include potassium salts and sodium salts. Examples of potassium salts include potassium acetate, potassium propionate, monopotassium citrate, dipotassium citrate, tripotassium citrate, monopotassium trihydrogen ethylenediaminetetraacetate, dipotassium dihydrogen ethylenediaminetetraacetate, tripotassium monohydrogen ethylenediaminetetraacetate, tetrapotassium ethylenediaminetetraacetate, potassium hydrogen phthalate, dipotassium phthalate, potassium hydrogen oxalate, dipotassium oxalate, and potassium bicarbonate. Examples of sodium salts include sodium acetate, sodium citrate, and sodium bicarbonate. One of these may be used alone, or two or more may be used in combination.

[0025] The content of component (A) is, for example, 10 to 60 parts by mass, preferably 25 to 55 parts by mass, and more preferably 30 to 50 parts by mass, per 100 parts by mass of the combined amount of components (A) and (B).The content of component (B) is, for example, 40 to 90 parts by mass, preferably 45 to 75 parts by mass, and more preferably 50 to 70 parts by mass, per 100 parts by mass of the combined amount of components (A) and (B).

[0026] Commercially available products may be used as the fire extinguishing agent component to be blended in the fire extinguishing agent-containing layer 1. An example of a commercially available fire extinguishing agent is Aerosol Fire Extinguisher K-1 manufactured by Yamato Protec Co., Ltd.

[0027] [Thermoplastic resin] The thermoplastic resin in the fire-extinguishing agent-containing layer 1 burns together with the inorganic oxidizer. 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, and fluorine-based resins.

[0028] The content of the thermoplastic resin in the extinguishing agent-containing layer 1 (based on the mass of the extinguishing agent-containing layer 1) is, for example, 20 to 70 mass%, preferably 25 to 60 mass%, and more preferably 30 to 50 mass%. When the content of the thermoplastic resin is 20 mass% or more, film formability can be achieved, while when it is 70 mass% or less, excellent fire extinguishing performance can be achieved.

[0029] [Other ingredients] Examples of other components that may be blended into the fire extinguishing agent-containing layer 1 include dispersants, solvents, colorants, ultraviolet absorbers, antioxidants, inorganic fillers, and adhesives. These components may be appropriately selected depending on the composition of the fire extinguishing agent-containing layer 1 and the type of thermoplastic resin. The content of other components in the fire extinguishing agent-containing layer 1 (based on the mass of the fire extinguishing agent-containing layer 1) is, for example, 10 mass% or less.

[0030] <Fire extinguishing film manufacturing method> The method for manufacturing the fire extinguishing film 10 includes the following steps. (A) A step of kneading a slurry or powder containing a fire extinguishing agent component that generates an aerosol upon combustion with a thermoplastic resin to obtain a kneaded product of a fire extinguishing composition. (B) A step of forming a layer made of the above kneaded material

[0031] By preparing a kneaded product in which the components contained in the fire extinguishing agent are sufficiently uniformly mixed in step (A), a fire extinguishing film 10 that stably exhibits excellent fire extinguishing performance can be produced. Whether the components contained in the fire extinguishing agent are sufficiently uniformly mixed can be evaluated by forming a 100 μm-thick layer of the fire extinguishing composition, measuring the haze at 15 locations within an area of 150 mm length x 150 mm width, and calculating the standard deviation of the 15 measurements. According to the inventors' studies, a fire extinguishing agent-containing layer 1 that stably exhibits excellent fire extinguishing performance can be produced by having a standard deviation of 2.0 or less for the 15 haze measurements. In other words, it is preferable to thoroughly knead the slurry and thermoplastic resin in step (A) so that the standard deviation of the 15 haze measurements is 2.0 or less. Examples of dispersion media used to prepare the slurry include ethyl acetate, butyl acetate, ethyl methyl ketone, methyl isobutyl ketone, methanol, ethanol, and isopropanol.

[0032] Steps (A) and (B) may be performed using an extruder. That is, it is preferable to prepare the kneaded mixture using an extruder (more preferably a twin-screw extruder) having a kneading section for kneading the fire-extinguishing composition. The fire-extinguishing film 10 according to this embodiment is a single-layer film consisting of the fire-extinguishing agent-containing layer 1, and can be cast-molded, for example, by T-die extrusion.

[0033] The manufacturing method according to this embodiment allows for efficient production of the fire extinguishing film 10 by extrusion molding. The fire extinguishing film 10 can be easily installed in areas where there is a risk of fire and is highly effective in extinguishing a fire in its early stages. This makes it useful in terms of being able to suppress the spread of fire.

[0034] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. For example, in the above embodiments, a single-layer film (extruded film) made of a fire-extinguishing agent-containing layer 1 has been exemplified as the fire-extinguishing film, but the fire-extinguishing film may also be a multilayer film including the fire-extinguishing agent-containing layer 1. The fire-extinguishing film 20 shown in FIG. 3 comprises the fire-extinguishing agent-containing layer 1 and a substrate 3 in this order. The fire-extinguishing agent-containing layer 1 may be provided on at least a portion of one surface 3a of the substrate 3, but may also be provided on the entire surface 3a as shown in FIG. 3.

[0035] A transparent resin substrate can be selected as the substrate 3. Examples of materials for the resin substrate include polyolefins (such as LLDPE, PP, COP, and CPP), polyesters (such as PET), fluororesins (such as PTFE, ETFE, EFEP, PFA, FEP, and PCTFE), PVC, PVA, acrylic resins, epoxy resins, polyamides, and polyimides. Among these, the resin substrate may contain at least one selected from the group consisting of HDPE, LDPE, OPP, PVC, PVDC, PET, PBT, PAN, PCTFE, and COP, which have low water vapor permeability and are likely to inhibit deterioration of the fire-extinguishing agent components. Furthermore, selecting a highly transparent material facilitates visual inspection of the fire-extinguishing film 20 and confirmation of its replacement timing. The substrate 3 may be made of metals such as aluminum and stainless steel, or may be made of non-combustible paper or glass cloth. The substrate 3 may contain a fire-extinguishing agent.

[0036] The thickness and breaking strength of the substrate 3 can be appropriately selected depending on the amount of heat at the time of fire outbreak, impact, allowable space, etc. For example, a thick resin substrate makes it easier to suppress water vapor permeation, provides strength and rigidity, and allows for a highly flat form, making handling easier. Furthermore, a thin substrate allows the fire extinguishing film to be provided in a narrow space. The thickness of the substrate 3 can be, for example, 10 to 150 μm, and may be 20 to 50 μm. The substrate 3 may be a laminate of multiple resin films.

[0037] The substrate 3 may be a resin substrate (high-strength, heat-resistant resin substrate) that is heat-resistant and impact-resistant. A high-strength, heat-resistant substrate preferably has at least one of a tensile strength of 20 N / cm or more and a melting point of 500°C or more. The resin substrate may contain, as a reinforcing material, materials such as carbon, glass, stainless steel, aluminum, and ceramic, particularly woven fabric (cloth) made of fibers made of these materials. The heat-resistant and impact-resistant properties of the resin substrate can prevent holes from being created in the resin substrate due to heat or impact during ignition. This can prevent the fire extinguishing agent from being sprayed in the direction opposite to the target X (see FIG. 4).

[0038] The substrate 3 preferably has a water vapor barrier property to such an extent that the properties of the fire extinguishing agent component contained in the fire extinguishing agent-containing layer 1 do not change significantly, regardless of the installation location or usage environment of the fire extinguishing film 20. The water vapor permeability of the substrate 3 (under conditions of 40°C / 90% RH in accordance with JIS K 7129) is not particularly limited because it can be designed according to the type of fire extinguishing agent component, but is preferably 2×10 2 g / m 2 / day or less, 1 x 10 2 g / m 2 / day or less. From the viewpoint of adjusting the water vapor permeability, the base material 3 may be provided with a vapor-deposited layer (alumina vapor-deposited layer or silica vapor-deposited layer) having water vapor barrier properties.

[0039] The fire-extinguishing film may further comprise a pressure-sensitive adhesive layer or an adhesive layer. The fire-extinguishing film 30A shown in FIG. 5(a) is composed of a fire-extinguishing agent-containing layer 1, a pressure-sensitive adhesive layer 4 provided on one side of the fire-extinguishing agent-containing layer 1, and a release film 5 provided so as to cover the pressure-sensitive adhesive layer 4. The fire-extinguishing film 30B shown in FIG. 5(b) is composed of a substrate 3, a fire-extinguishing agent-containing layer 1, a pressure-sensitive adhesive layer 4 provided on one side of the fire-extinguishing agent-containing layer 1, and a release film 5 provided so as to cover the pressure-sensitive adhesive layer 4. The release film 5 is peeled off when the fire-extinguishing films 30A and 30B are used, and may be made of resin or paper. The pressure-sensitive adhesive layer 4 or adhesive layer in the fire-extinguishing film makes it easier to install the fire-extinguishing film in locations where there is a risk of fire.

[0040] The fire-extinguishing film may have a configuration in which the fire-extinguishing agent-containing layer 1 is sandwiched between other layers. The fire-extinguishing film 40 shown in Fig. 6 includes the fire-extinguishing agent-containing layer 1 and surface layers 6a, 6b arranged to sandwich the fire-extinguishing agent-containing layer 1. For example, the same resin substrate as the substrate 3 can be used for the surface layers 6a, 6b. By providing the surface layers 6a, 6b, the durability or design of the fire-extinguishing agent-containing layer 1 can be improved, and a fire-extinguishing film 40 with high strength can be obtained.

[0041] In the above embodiment, a fire extinguishing film having a fire extinguishing agent-containing layer 1 with a thickness of 1 mm or less is exemplified, but a fire extinguishing sheet (not shown) having a fire extinguishing agent-containing layer with a thickness of more than 1 mm may also be produced. The thickness of the fire extinguishing agent-containing layer may be appropriately set depending on the application of the fire extinguishing sheet, and may be, for example, 1 to 5 mm, or 1 to 3 mm.

[0042] In the above embodiment, the fire extinguishing agent-containing layer 1 is made of a fire extinguishing composition in which the components are sufficiently uniformly mixed. However, this fire extinguishing composition may be used for various purposes. For example, a molded product may be produced using the fire extinguishing composition. FIG. 7 is a schematic plan view of an outlet cover made of the fire extinguishing composition, which is an example of a molded product. The outlet cover 50 shown in FIG. 7 has a substantially rectangular shape in plan view and is provided with multiple openings 50a corresponding to the shape of the plug. By forming the outlet cover 50 from the fire extinguishing composition, it is possible to prevent the spread of fire even if the plug breaks out. The fire extinguishing composition can be produced by injection molding, blow molding, vacuum molding, or the like. [Example]

[0043] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0044] Example 1 The following materials were prepared: Fire extinguishing agent components: Slurry of potassium chlorate (inorganic oxidizer) and tripotassium citrate (potassium salt) dispersed in ethyl acetate (product name: K-1, manufactured by Yamato Protec Co., Ltd.) Thermoplastic resin: Polyethylene pellets (product name: LC600A, manufactured by Japan Polyethylene Co., Ltd.)

[0045] The above slurry was added to polyethylene pellets and dry blended. The amount of slurry added was adjusted so that the amount of fire extinguishing agent components contained in the slurry was 50 parts by mass per 100 parts by mass of polyethylene pellets. After the slurry permeated the polyethylene pellets and the pellets became smooth, a fire extinguishing film having a 100 μm-thick fire extinguishing agent-containing layer was produced by T-die extrusion molding using a twin-screw extruder with a kneading zone.

[0046] <Example 2> A fire-extinguishing film was produced in the same manner as in Example 1, except that the thickness of the fire-extinguishing agent-containing layer was changed to 50 μm instead of 100 μm.

[0047] Example 3 A fire-extinguishing film was prepared in the same manner as in Example 1, except that the amount of the fire-extinguishing agent component per 100 parts by mass of polyethylene pellets was adjusted to 30 parts by mass instead of 50 parts by mass.

[0048] Example 4 A fire-extinguishing film was prepared in the same manner as in Example 2, except that the amount of the fire-extinguishing agent component per 100 parts by mass of polyethylene pellets was adjusted to 30 parts by mass instead of 50 parts by mass.

[0049] <Comparative Example 1> A fire-extinguishing film was produced in the same manner as in Example 1, except that a single-screw extruder without a kneading zone was used instead of a twin-screw extruder with a kneading zone.

[0050] <Comparative Example 2> A fire-extinguishing film was produced in the same manner as in Example 1, except that a slurry containing a fire-extinguishing agent component was not used.

[0051] <Comparative Example 3> A fire-extinguishing film was produced in the same manner as in Example 2, except that a slurry containing a fire-extinguishing agent component was not used.

[0052] <Haze measurement> The haze of the fire-extinguishing films according to Examples 1 to 4 and Comparative Example 1 was measured as follows. Specifically, the produced fire-extinguishing films were cut into 150 mm length x 150 mm width samples. Using a haze meter (NDH2000) manufactured by Nippon Denshoku Industries Co., Ltd., the haze (unit: %) was measured at 15 points (positions spaced apart at approximately equal intervals, see Figure 8) on the surface of the sample. The standard deviation (unit: %) of the 15 measured values was calculated. The results are shown in Table 1.

[0053] <Fire extinguishing test> The fire extinguishing films according to the examples and comparative examples were cut into pieces of 20 mm length x 20 mm width to obtain samples. A solid type ignition material (product name: Hi-Chucker L CK-30, made of compressed wood fiber, manufactured by Onoue Seisakusho Co., Ltd.) was placed in a 1 cm 3 The temperature was measured at 100°C. An ignition material was placed in a pan placed inside an aluminum container, and the ignition material was ignited to create a flame. The sample was held with tweezers and brought close to the burning ignition material to a height of 20 mm. After the sample was set ablaze, it was observed whether the flame could be extinguished within 5 seconds. Fire extinguishing performance was evaluated based on the following criteria. The results are shown in Table 1. A: The fire was extinguished within 5 seconds. B: There were some areas where the fire could not be extinguished within 5 seconds. C: The fire could not be extinguished and burned violently.

[0054] [Table 1] [Industrial Applicability]

[0055] The present invention provides a fire-extinguishing film that can be easily installed in areas where there is a risk of fire and that is highly effective in extinguishing a fire in its early stages, as well as a method for efficiently producing the same. The present invention also provides a fire-extinguishing composition, a fire-extinguishing sheet, and a fire-extinguishing molded product that have excellent fire-extinguishing performance. [Explanation of symbols]

[0056] 1...fire extinguishing agent-containing layer, 3...base material, 3a...surface, 4...adhesive layer, 5...release film, 6a, 6b...surface layer, 10, 20, 30A, 30B, 40...fire extinguishing film, 50...outlet cover (fire extinguishing molded product), 50a...opening, X...target object

Claims

[Claim 1] (A) obtaining a fire-extinguishing composition by kneading a slurry or powder containing a fire-extinguishing agent component that generates an aerosol upon combustion with a thermoplastic resin in a kneading zone of a twin-screw extruder having the kneading zone; (B) molding the fire-extinguishing composition by T-die extrusion molding using the twin-screw extruder to obtain a fire-extinguishing film having a thickness of 20 to 800 μm; Including, the content of the thermoplastic resin in the fire extinguishing composition is 20 to 70 mass% based on the mass of the fire extinguishing composition; The fire extinguishing composition has a standard deviation of 15 haze measurements of 2.0 or less, The 15 measured values obtained by the haze measurement are measured at 15 locations within an area of 150 mm length x 150 mm width on the haze measurement film, the film for haze measurement is a 100 μm thick film made of the fire-extinguishing composition obtained by kneading in step (A), and is obtained by T-die extrusion molding using the twin-screw extruder.

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