JP2023170882A - fire extinguisher - Google Patents

Abstract

To provide a fire extinguisher capable of easily exhibiting fire-extinguishing performance even if there is a certain distance from the origin of fire to the fire extinguisher.SOLUTION: A fire extinguisher includes a fire-extinguishing material including a fire-extinguishing agent-containing layer, and an aluminum foil arranged so as to cover at least one surface of the fire-extinguishing material. The fire extinguisher may further have an intermediate layer between the fire-extinguishing material and the aluminum foil. The aluminum foil may have a notch or depression on the surface.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a fire extinguishing body.

Patent Document 1 discloses a fire extinguishing body in which a fire extinguishing agent composition that generates an aerosol upon combustion is mixed with a binder and the mixture is formed into a sheet shape. Patent Document 2 discloses a fire extinguishing film that can be easily installed in areas where there is a risk of ignition, and that exhibits an excellent initial extinguishing effect in the event of ignition. FIG. 6 of Patent Document 2 shows a fire extinguishing film 40 comprising a fire extinguishing agent-containing layer 1 and surface layers 6a and 6b arranged to sandwich the extinguishing agent-containing layer 1, and paragraph [0040] of the same document describes that, for example, a resin base material can be used as the surface layers 6a and 6b.

International Publication No. 2018/047762 Japanese Patent Application Publication No. 2021-137345

By the way, when a fire extinguisher is placed in a high temperature and humid environment, the performance of the fire extinguisher may deteriorate due to moisture infiltration. Therefore, as shown in FIG. 6 of Patent Document 2, it is considered that the deterioration in performance of the fire extinguisher is suppressed by sandwiching and protecting the fire extinguisher-containing layer between a pair of resin base materials. According to studies conducted by the present inventors, a fire extinguishing body having such a configuration can quickly exhibit extinguishing performance when a fire occurs at a position where the flame directly hits the fire extinguishing body. However, if there is a distance from the fire source to the fire extinguishing body, it may take time for the fire extinguishing performance to develop, and there is room for improvement in this respect.

The present disclosure has been made in view of the above circumstances, and provides a fire extinguishing body that easily exhibits fire extinguishing performance even if there is a certain distance from the fire source to the fire extinguishing body.

A fire extinguisher according to one aspect of the present disclosure includes a fire extinguisher including a layer containing a fire extinguisher, and an aluminum foil disposed to cover at least one surface of the fire extinguisher. Aluminum foil has superior thermal conductivity compared to resin base materials, so even if there is a certain distance from the fire source to the extinguishing element, the entire extinguishing element is heated in a relatively short time, and the heat in the layer containing the extinguishing agent is heated. Expansion causes the aluminum foil to break and easily exhibit fire extinguishing performance. The thickness of the aluminum foil is, for example, 5 μm or more.

The fire extinguisher may further include an intermediate layer between the fire extinguisher-containing layer and the aluminum foil. The intermediate serves, for example, to bond the extinguishing agent-containing layer and the aluminum foil. The intermediate layer is made of, for example, a resin material having a melting point of 70° C. or higher.

In view of the ease with which the aluminum foil breaks, the aluminum foil may have cuts on its surface. A specific example of this is that the aluminum foil has grid-like cuts on its surface. In reality, it is often not known in advance where the fire will start and where on the extinguishing body the fire will come in contact with the fire, so it is effective to have grid-like cuts over a wide area on the surface of the aluminum foil. . Since it is sufficient that the aluminum foil is easy to tear, depressions may be formed on the surface of the aluminum foil instead of or together with the notches.

The fire extinguishing body may be able to withstand use in a high temperature and high humidity environment. That is, the above fire extinguishing body has a mass change rate expressed by the following formula, for example, of 1.5% or less.
Mass change rate = (W1-W0)/W0×100
[In the formula, W1 indicates the mass of the fire extinguishing body after being stored for 160 hours at a temperature of 85° C. and a relative humidity of 85%, and W0 indicates the initial mass of the fire extinguishing body. ]

According to the present disclosure, there is provided a fire extinguishing body that easily exhibits fire extinguishing performance even if there is a certain distance from the fire source to the fire extinguishing body.

FIG. 1 is a perspective view schematically showing a fire extinguishing body according to an embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view of the fire extinguishing body shown in FIG. 1 taken along the line II-II. 3(a) to 3(c) are cross-sectional views schematically showing the steps of manufacturing the fire extinguishing body shown in FIG. 1. FIG. 4 is a cross-sectional view schematically showing a fire extinguishing body according to another embodiment of the present disclosure.

Embodiments of the present disclosure will be described in detail below, with reference to the drawings as the case may be. However, the present invention is not limited to the following embodiments.

<Fire extinguishing body>
FIG. 1 is a perspective view schematically showing a fire extinguishing body according to the present embodiment, and FIG. 2 is a schematic cross-sectional view taken along the line II-II of the fire extinguishing body shown in FIG. The extinguishing body 10 shown in these figures includes a fire extinguishing material 3, an aluminum foil 5 disposed to cover the surface of the fire extinguishing material 3, and an intermediate layer 4 provided between the fire extinguishing material 3 and the aluminum foil 5. Equipped with In this embodiment, the fire extinguishing agent 3 includes a fire extinguishing agent-containing layer 1 and a base material 2. A grid-like cut 5a is formed on the surface of the aluminum foil 5. Each configuration will be explained below.

(Extinguishing agent containing layer)
The fire extinguishing agent-containing layer 1 may be formed by molding a composition (composition for forming a fire extinguishing agent) containing a fire extinguishing agent and a binder. By forming the extinguishing agent using a binder, the properties of the extinguishing agent can be easily maintained, and the frequency of extinguishing extinguisher replacement can be reduced. In addition to the above resin and binder, the composition for forming a fire extinguishing material may further contain a liquid medium.

The extinguishing agent is not particularly limited, and any extinguishing agent having the four elements of extinguishing (removal action, cooling action, suffocation action, and negative catalytic action) can be used as appropriate depending on the aspect of the object. Examples of the extinguishing agent include ABC extinguishing agent and BC(K) extinguishing agent. The fire extinguishing agent can contain at least one of an organic salt and an inorganic salt.

Thermoplastic resins and thermosetting resins can be used as binders. Thermoplastic resins include polyolefin resins such as polypropylene resins, polyethylene resins, poly(1-)butene resins, and polypentene resins, polystyrene resins, acrylonitrile-butadiene-styrene resins, and methyl methacrylate-butadiene-styrene resins. , ethylene-vinyl acetate resin, ethylene-propylene resin, polycarbonate resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, polyvinyl alcohol (PVA), polyvinyl butyral (PVB), etc. . Thermosetting resins include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR), and 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), polyurethane resin, polyisocyanate resin, polyisocyanurate resin, phenol resin, epoxy resin, etc. The binder may include a curing agent component.

The extinguishing agent-containing layer 1 may contain a colorant, an antioxidant, a flame retardant, an inorganic filler, etc. as other components. These components can be appropriately selected depending on the composition of the fire extinguishant-containing layer 1 and the type of binder.

The extinguishing agent content of the extinguishing agent-containing layer 1 (based on the total mass of the extinguishing agent-containing layer 1) can be 70 to 97% by mass, may be 80 to 95% by mass, and can be 85 to 92% by mass. It's good. When the content of the fire extinguishing agent is 70% by mass or more, it is easy to achieve excellent fire extinguishing performance, and on the other hand, when the content is 97% by mass or less, it is easy to achieve excellent moldability.

The thickness of the extinguishing agent-containing layer 1 can be appropriately set depending on the amount of extinguishing agent to be mixed. The thickness of the extinguishing agent-containing layer 1 may be, for example, 1 mm or less, may be 30 to 1000 μm, may be 100 to 500 μm, or may be 150 to 500 μm.

Liquid media 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; Examples include glycol ethers such as methylpyrrolidone (NMP), tetrahydrofuran, and butyl cellosolve. From the viewpoint that the fire extinguisher has deliquescent properties, the liquid medium may be an alcoholic solvent, and specifically may be isopropyl alcohol.

The amount of the liquid medium may be adjusted as appropriate depending on the method of use of the composition for forming a fire extinguisher, but it can be 40 to 95% by mass based on the total amount of the composition for forming a fire extinguisher. A composition for forming a fire extinguishing agent containing a liquid medium can be referred to as a coating liquid for forming a fire extinguishing agent.

(Base material)
Examples of the base material 2 include polyolefin (LLDPE, PP, COP, CPP, etc.), polyester (PET, etc.), fluororesin (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), PVC, PVA, acrylic resin, Examples include films of epoxy resin, polyamide, polyimide, polycarbonate (PC), and the like. Among these, polyester (PET, etc.) films are preferred from the viewpoint of easily suppressing deterioration of the fire extinguishant-containing layer 1.

The thickness of the base material 2 can be appropriately selected depending on the amount of heat at the time of fire outbreak, impact, allowable space, etc. The thickness of the base material 2 may be 5 μm or more, or 10 μm or more. Further, the thickness of the base material 2 may be 100 μm or less, or 30 μm or less.

(middle class)
The intermediate layer 4 is for adhering the fire extinguishing material 3 and the aluminum foil 5 and for sealing the fire extinguishing material 3. The intermediate layer 4 is made of, for example, a resin material that has heat-melting properties (heat-fusibility). Polyolefin resins are examples of resin materials having heat-melting properties. That is, the resin layer may contain a polyolefin resin. Examples of polyolefin resins include polyolefin resins such as low density polyethylene resin (LDPE), linear low density polyethylene resin (LLDPE), medium density polyethylene resin (MDPE), unstretched polypropylene resin (CPP), and ethylene/vinyl acetate. Copolymers, polyethylene resins such as ethylene/α-olefin copolymers, and polypropylene resins such as propylene/ethylene random copolymers, propylene/ethylene block copolymers, propylene/α-olefin copolymers, etc. . Among these, polyolefin resins are low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), from the viewpoint of excellent heat sealability, low water vapor permeability, and easy suppression of deterioration of extinguishing agent. , or unoriented polypropylene resin (CPP).

As shown in FIG. 2, the peripheral edge 10a of the fire extinguishing body 10 is not covered with the aluminum foil 5, and there may be places where the intermediate layer 4 is exposed. If the intermediate layer 4 at that location melts before the cut 5a of the aluminum foil 5, there is a possibility that the fire extinguishing material will leak laterally. In order to suppress this, the intermediate layer 4 is preferably made of a resin material having a melting point of 70° C. or higher (more preferably 75° C. or higher, still more preferably 95° C. or higher), for example. The intermediate layer 4 may be made of a heat-resistant adhesive instead of a heat-sealing film.

(aluminum foil)
As shown in FIGS. 1 and 2, the aluminum foil 5 constitutes the outermost layer of the fire extinguisher 10. The thickness of the aluminum foil 5 may be 5 μm or more, 15 μm or more, or 35 μm or more. When the thickness of the aluminum foil 5 is 5 μm or more, pinholes do not occur frequently and deterioration of barrier properties can be avoided. Further, the thickness of the aluminum foil 5 is, for example, 45 μm or less, and may be 100 μm or less.

As shown in FIGS. 1 and 2, the aluminum foil 5 has a cut 5a formed on its surface. In this embodiment, grid-like cuts 5a are formed over the entire surface F1 of the aluminum foil 5 (see FIG. 1). The cuts 5a are provided to make the aluminum foil 5 easier to break due to thermal expansion of the fire extinguishant-containing layer 1. The cut 5a is formed halfway in the thickness direction of the aluminum foil 5 from the outer surface F1, and does not reach the inner surface F2. In addition, instead of the grid shape, for example, a plurality of linear cuts may be formed over the entire surface F1.

As shown in FIG. 2, the cut 5a is formed in the aluminum foil 5 disposed to cover the side of the fire extinguishing agent 3 on which the extinguishing agent-containing layer 1 is formed. That is, in the fire extinguishing body 10, the surface of the aluminum foil 5 on which the notches 5a are formed is the flame contact surface (the surface that can be contacted by flames caused by ignition). Note that since it is sufficient that the aluminum foil 5 is easily torn, a depression (not shown) may be formed on the surface of the aluminum foil instead of the cut 5a or together with the cut 5a. Methods for forming incisions or depressions on the surface F1 of the aluminum foil 5 include, for example, a method of covering the fire extinguishing material 3 with the aluminum foil 5 and then making an incision with a cutter, and a method of half-cutting using a Thomson blade.

Since the fire extinguishing material 3 is covered with the aluminum foil 5 which has excellent thermal conductivity, even if there is a certain distance from the fire source to the fire extinguishing body 10, the entire fire extinguishing body 10 is heated in a relatively short period of time, and the fire is extinguished. The aluminum foil 5 is easily torn due to the thermal expansion of the agent-containing layer 1 and exhibits fire extinguishing performance. Moreover, by covering the fire extinguishing agent 3 with the aluminum foil 5 having excellent gas barrier properties, it is possible to suppress moisture from entering the inside of the fire extinguishing body 10 and thereby deteriorating the performance of the extinguishing agent. The mass change rate of the fire extinguisher 10 expressed by the following formula is, for example, 1.5% or less, and may be 1.0% or less or 0.5% or less.
Mass change rate = (W1-W0)/W0×100
[In the formula, W1 indicates the mass of the fire extinguishing body after it has been stored for 160 hours in an environment with a temperature of 85° C. and a relative humidity of 85%, and W0 indicates the initial mass of the fire extinguishing body. ]

<Method for manufacturing fire extinguishing body>
A method of manufacturing the fire extinguisher 10 will be described with reference to FIG. 3. The fire extinguishing body 10 can be manufactured, for example, by a roll-to-roll method as follows. That is, the extinguishing agent-containing layer 1 is formed by applying a coating liquid for forming a fire extinguishing agent onto the surface of the base material 2 and drying it (see FIG. 3(a)). Application can be performed by a wet coating method. Examples of the wet coating method include a gravure coating method, a comma coating method, a spray coating method, a dip coating method, a curtain coating method, a spin coating method, a sponge roll method, a die coating method, and painting with a brush. Next, a heat sealing film 4a is placed on both sides of the fire extinguishing agent 3 (a laminate of the fire extinguishing agent containing layer 1 and the base material 2), and an aluminum foil 5 is further placed on the outside of the heat sealing film 4a (FIG. 3). (see (b)). A fire extinguishing body 10A is formed by pressing the laminate 8 shown in FIG. 3(b) while applying heat and cutting it out from a die (see FIG. 3(c)). Thereafter, the fire extinguishing body 10 is obtained through a process of forming cuts 5a by half-cutting the aluminum foil 5 using, for example, a Thomson blade (not shown). Note that instead of using the heat-sealing film 4a, the fire extinguishing material 3 and the aluminum foil 5 may be bonded together using a heat-resistant adhesive.

Although the embodiments of the present disclosure have been described in detail above, the present invention is not limited to the above embodiments. For example, in the above embodiment, the aluminum foil 5 is arranged so as to cover both sides of the fire extinguishing material 3, but the aluminum foil 5 is arranged so as to cover only one surface of the fire extinguishing material 3. (See FIG. 4). In the extinguishing body 20 shown in FIG. 4, an aluminum foil 5 is arranged to cover the side of the extinguishing agent 3 on which the extinguishing agent-containing layer 1 is formed. For example, an adhesive layer (not shown) may be provided on the surface of the base material 2 so that the fire extinguisher 20 can be attached to a predetermined location. In the above embodiment, the case where the notches 5a (and/or depressions) are formed in the aluminum foil 5 is illustrated, but if the aluminum foil 5 is in a manner that is easily torn by the internal pressure of the fire extinguishing body, the notches 5a (and/or depressions) are formed in the aluminum foil 5. It is not necessary to provide a depression or depression (see FIG. 3(c)).

This disclosure relates to:
[1] A fire extinguishing body comprising a fire extinguishing material including a fire extinguishing agent-containing layer and an aluminum foil disposed to cover at least one surface of the fire extinguishing material.
[2] The fire extinguishing body according to item [1], further comprising an intermediate layer between the fire extinguishing material and the aluminum foil.
[3] The fire extinguishing body according to item [2], wherein the intermediate layer is made of a resin material having a melting point of 70° C. or higher.
[4] The fire extinguishing body according to any one of items [1] to [3], wherein the aluminum foil has a notch or a depression on the surface.
[5] The fire extinguishing body according to any one of items [1] to [3], wherein the aluminum foil has grid-like cuts on the surface.
[6] The fire extinguisher according to any one of items [1] to [5], wherein the aluminum foil has a thickness of 5 μm or more.
[7] The fire extinguishing body according to any one of items [1] to [6], wherein the mass change rate expressed by the following formula is 1.5% or less.
Mass change rate = (W1-W0)/W0×100
[In the formula, W1 represents the mass of the fire extinguisher after being stored for 160 hours in an environment with a temperature of 85° C. and a relative humidity of 85%, and W0 represents the initial mass of the fire extinguisher. ]

The present disclosure will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples.

<Fire extinguishing body>
(Example 1)
A powder fire extinguisher (product name: ABC fire extinguisher, manufactured by Morita Miyata Industries Co., Ltd.) and a urethane-based binder (product name: TE-5899, manufactured by Mitsui Chemicals, Inc.) are added to isopropyl alcohol and mixed to form a coating liquid. I got it. The mass ratio of the binder and the extinguishing agent (mass of the binder/mass of the extinguishing agent) was adjusted to 1/10.

This coating liquid was applied onto a PET support substrate (product name: S10, manufactured by Toray Industries, Inc.) using an applicator and dried at a drying temperature of 90°C for 1 minute to form a 150 μm thick extinguishing agent-containing layer. was formed.

Adhesive (trade name: AD393:CAT-EP5=15:1, manufactured by Toyo Ink Co., Ltd.) was applied to the upper and lower parts of the obtained extinguishing agent-containing layer, and aluminum foil (9 μm thick) was applied to the upper and lower parts. They were bonded together (heat sealing conditions: 180°C, 10 seconds, 0.5 MPa). Thereafter, cuts were made on the surface of the aluminum foil using a cutter. Through these steps, a fire extinguishing body having the same configuration as the fire extinguishing body shown in FIGS. 1 and 2 was produced.

(Example 2)
A fire extinguishing body was produced in the same manner as in Example 1, except that a heat-adhesive film LLDPE (trade name: MC-S, Mitsui Chemicals Tohcello Co., Ltd.) was used instead of applying an adhesive.

(Example 3)
A fire extinguishing body was produced in the same manner as in Example 1, except that the surface of the aluminum foil was not cut with a cutter.

(Example 4)
A fire extinguishing body was produced in the same manner as in Example 2, except that the surface of the aluminum foil was not cut with a cutter.

(Comparative example 1)
A fire extinguishing body was produced in the same manner as in Example 4, except that a gas barrier film (transparent vapor-deposited barrier film, trade name: GL film, manufactured by Toppan Printing Co., Ltd.) was used in place of the aluminum foil.

<Evaluation items>
(Rate of mass change due to moisture intrusion)
Using the extinguishing bodies according to Examples and Comparative Examples, the water content (weight change) of the extinguishing agent-containing layer was measured after 160 hours in an environment of 85°C and 85%, and the mass change rate was calculated from the following formula. was calculated. Table 1 shows the results.
Mass change rate = (W1-W0)/W0×100
In the formula, W1 indicates the mass of the fire extinguishing body after it has been stored for 160 hours in an environment with a temperature of 85° C. and a relative humidity of 85%, and W0 indicates the initial mass of the fire extinguishing body. The initial mass of the extinguishing body was measured after the extinguishing body was stored in an environment with a temperature of 25° C. and a relative humidity of 10% for 24 hours or more, and the extinguishing body was sufficiently dry.

(Surface thermal conductivity)
The thermal conductivity of the flame contact surface of the fire extinguisher was measured by a method based on JIS R 1611-1997. Table 1 shows the results.

(Surface temperature after contact with flame)
Fuel (1 g of heptane) was placed in a 1 m ³ chamber covered with walls on all sides, and a fire extinguisher was placed 10 cm above it. The fire extinguishing body having the notches was arranged so that the surface on which the notches were formed faced downward. After the fuel was ignited, the peak temperature for 60 seconds was measured with a K thermocouple, and this was taken as the surface temperature of the flame contact surface. The position at which the temperature was measured by the K thermocouple was 1.5 cm laterally shifted from directly above the flame. Table 1 shows the results.

DESCRIPTION OF SYMBOLS 1... Extinguishing agent containing layer, 2... Base material, 3... Fire extinguishing material, 4... Intermediate layer, 4a... Heat fusion film, 5... Aluminum foil, 5a... Notch, 10, 10A... Fire extinguishing body, 10a... Peripheral part, F1...Surface of aluminum foil (outside), F2...Surface of aluminum foil (inside).

Claims (7)

a fire extinguishing material including a layer containing a fire extinguishing agent;
Aluminum foil arranged to cover at least one surface of the fire extinguishing material;
A fire extinguishing body. The fire extinguishing body according to claim 1, further comprising an intermediate layer between the fire extinguishing material and the aluminum foil. The fire extinguishing body according to claim 2, wherein the intermediate layer is made of a resin material having a melting point of 70°C or higher. The fire extinguishing body according to any one of claims 1 to 3, wherein the aluminum foil has a cut or a depression on the surface. The fire extinguisher according to any one of claims 1 to 3, wherein the aluminum foil has grid-like cuts on its surface. The fire extinguishing body according to any one of claims 1 to 3, wherein the aluminum foil has a thickness of 5 μm or more. The fire extinguishing body according to any one of claims 1 to 3, wherein the mass change rate expressed by the following formula is 1.5% or less.
Mass change rate = (W1-W0)/W0×100
[In the formula, W1 represents the mass of the fire extinguisher after being stored for 160 hours in an environment with a temperature of 85° C. and a relative humidity of 85%, and W0 represents the initial mass of the fire extinguisher. ]

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