JP2023058123A - Fire spread inhibitor - Google Patents

Abstract

To provide a fire spread inhibitor that can resist burning well compared to the conventional fire spread inhibitor.SOLUTION: The fire spread inhibitor comprises a laminate comprising a metal and/or carbon plate and a fabric, and a flame-retardant liquid, which are sealed in a film bag.SELECTED DRAWING: None

Description

The present invention relates to a fire spread suppressing material.

In a battery pack such as a lithium-ion battery, a short circuit or the like causes the cell to heat up to 900° C. in several minutes, causing the cell to ignite. Therefore, a fire spread suppressing material is provided between each cell so as to suppress the spread of fire to other adjacent cells.

For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2018-204708) describes "a heat insulating material having a composite layer containing a fiber sheet and silica airgel, wherein the fiber sheet is folded and laminated." 1) is described. According to Patent Document 1, the composite layer is formed by impregnating fibers with a silica airgel gel raw material, laminating the fibers to a desired thickness after impregnation, and then reacting the gel raw materials to form a wet gel. , and finally hydrophobizing the wet gel surface and drying with hot air (paragraph [0019]). In addition, Patent Document 1 discloses a configuration in which a heat dissipation material (for example, a metal plate with high heat conductivity such as aluminum) is sandwiched between layers of the fiber sheets as a preferred embodiment (Claim 6, paragraph [0038] ]).

In addition, Patent Document 2 (Japanese Patent Application Laid-Open No. 2019-123100) describes "a sheet-like base material made of fibers and impregnated in the base material and/or provided on the surface of the base material. and a heat-removing composite material containing a water-containing adhesive heat-removing agent composition.” (Claim 1). According to Patent Document 2, the water-containing adhesive heat remover composition contains water (paragraph [0038]), retains water efficiently, and is not particularly limited as long as it has adhesiveness to the product. , it is disclosed that such a heat remover composition preferably contains, for example, a water-soluble resin and/or a water-swelling mineral (paragraph [0034]).

Japanese Unexamined Patent Application Publication No. 2018-204708 Japanese Patent Application Laid-Open No. 2019-123100

An object of the present invention is to provide a fire spread suppressing material that is more difficult to burn than known fire spread suppressing materials. Specifically, in an electrochemical device having a plurality of cells such as a battery, the object is to provide a fire spread suppressing material capable of delaying the transfer of heat released from a cell in which a fire has occurred to an adjacent cell.

The present invention relates to the following inventions:
[1] A fire spread suppressing material in which a laminate including a metal plate and/or a carbon plate and fabric, and a flame-retardant liquid are sealed in a film bag.
[2] The fire spread inhibitor of [1], wherein inorganic particles are dispersed in the flame-retardant liquid.
[3] The fire spread inhibitor of [1] or [2], wherein the flame-retardant liquid is a low-fluidity liquid.
[4] The fire spread inhibitor according to any one of [1] to [3], wherein the flame-retardant liquid contains a gelling agent.
[5] The fire spread suppressing material according to any one of [1] to [4], wherein the flame-retardant liquid that does not have a flash point is enclosed in a film bag.
[6] The fire spread suppressing material according to any one of [1] to [5], wherein the fabric is a non-woven fabric containing flame-retardant fibers.

According to the fire spread suppressing material of the above [1] of the present invention, even if a flame hits a local area of the fire spread suppressing material, heat is efficiently transmitted from the local area to the entire fire spread suppressing material. It is difficult to reach the starting temperature, or it takes a long time to reach the starting temperature, and it is possible to provide a fire spread suppressing material that is more difficult to burn.

More specifically, the presence of the metal plate and/or the carbon plate allows heat to be efficiently conducted to the entire fire spread suppressing material.
The fabric forms a laminate together with the metal plate and/or the carbon plate, and by retaining the flame-retardant liquid, it is possible to efficiently transmit heat to the entire fire-spread suppressing material. The presence of the liquid can exhibit an insulating effect.
By repeating heat absorption by vaporization and heat release by liquefaction in the film, the flame-retardant liquid can efficiently transmit locally generated heat to the entire fire spread suppression material, and its presence also exerts a heat insulating effect. be able to.
By enclosing it in the film bag, it is possible to prevent the flame-retardant liquid from evaporating from the fire spread suppressing material.

According to the fire spread suppressing material of [2], which is one of the preferred embodiments of the present invention, the inorganic particles are dispersed in the flame-retardant liquid, so that heat can be efficiently transmitted to the entire fire spread suppressing material. In addition, the presence of the flame-retardant liquid containing inorganic particles makes it possible to exhibit a further heat insulating effect.

According to the fire spread suppressing material of [3] or [4], which is another preferred embodiment of the present invention, the flame-retardant liquid is a low-fluidity liquid (for example, a jelly-like liquid with a gelling agent). In this case, even if the film bag is burned by being hit by flames, the flame-retardant liquid hardly leaks from the burnt-out portion, so that the heat insulating effect due to the presence of the flame-retardant liquid can be maintained.
In addition, since the flame-retardant liquid is a low-fluidity liquid, the flame-retardant liquid can flow through voids in the fabric, between the fabric and the metal plate and/or the carbon plate, between the fabric and the film bag, and between the film bag and the metal. It becomes easier to be held between plates and/or carbon plates. As a result, the uneven distribution of the flame-retardant liquid on the side of the fire spread suppressing material in the direction of gravity is prevented, and a fire spread suppressing material that is more heat insulating and less likely to burn can be provided.
Furthermore, the low-fluidity liquid has physical properties that make it difficult to deform against external force. Therefore, even if a load acts on the fire spread suppressing material from a battery cell or the like in the battery pack because the flame-retardant liquid enclosed in the film bag is a low-fluidity liquid, the load is applied. When the flame-retardant liquid is hard to deform, the film bag can be prevented from bursting. As a result, it is possible to provide a fire spread suppressing material that makes it difficult for the flame-retardant liquid to leak and that easily maintains the heat insulating effect.

According to the fire spread suppressing material of the above [5], which is still another preferred embodiment of the present invention, since the flame-retardant liquid is composed of a liquid that does not have a flash point, it provides a fire spread suppressing material that is more difficult to burn. be able to.

According to the fire spread suppressing material of [6], which is still another preferred embodiment of the present invention, the fabric is a non-woven fabric containing flame-retardant fibers (without using a binder or the like, leaving gaps between the fibers). (for example, a water-entangled nonwoven fabric), the nonwoven fabric can have many voids that can hold the flame-retardant liquid, and the capillary phenomenon by the nonwoven fabric is efficiently exhibited. is difficult to be unevenly distributed in the gravitational direction, etc., and is easily maintained in a state of being spread over the entire nonwoven fabric along the gaps between the fibers. Therefore, heat can be efficiently transferred to the entire fire spread suppressing material, and the presence of the flame-retardant liquid can exhibit a heat insulating effect.

The fire spread suppressing material of the present invention includes a laminate containing a metal plate and/or a carbon plate and a fabric, and a flame-retardant liquid, and the laminate and the flame-retardant liquid are enclosed in a film bag.

The metal plate and/or the carbon plate used in the present invention are stable at the temperature (for example, -40 to 80 ° C.) assumed when the battery pack equipped with the fire spread suppressing material is used, and have high thermal conductivity. / Or it can consist of a carbon material. Examples of metal plates include aluminum plates, copper plates, gold plates, silver plates, brass plates, iron plates, and stainless steel plates. These metal plates may be subjected to anticorrosion treatment such as painting, wet plating, dry plating, thermal spraying, lamination, and oxidation treatment. Further, examples of carbon plates include graphite sheets.

Its size, thickness and shape can be appropriately determined depending on the situation in which the fire spread suppressing material is used. It should be noted that the thickness can be 0.005 to 5 mm, can be 0.01 to 3 mm, and can be 0.02 to 1 mm.
It should be noted that a metal plate and/or a carbon plate coated with a filler having high thermal conductivity (for example, graphene, carbon nanotube, etc.) to enhance thermal conductivity may be employed.

As the fabric used in the present invention, a fiber sheet capable of retaining the flame-retardant liquid can be used, and examples thereof include nonwoven fabric, woven fabric, knitted fabric, and fiber web.
The fabric has a structure in which a fiber layer in which fibers are oriented in one direction (for example, a direction parallel to the conveying direction) and a fiber layer in which fibers are oriented in a direction different from the direction are laminated. It is preferably a fibrous web or non-woven fabric having a Specific examples include a cross-lay web in which unidirectional webs are laminated with different fiber orientations, a nonwoven fabric prepared using the fiber web, a criss-cross web in which a unidirectional web and a cross-lay web are laminated, or the fiber Nonwovens prepared from webs are preferred. Alternatively, it is preferably a random web having no specific fiber orientation or a nonwoven fabric prepared using the fiber web. By adopting a fabric having such a fiber orientation, the flame-retardant liquid is likely to be distributed throughout the fabric. Therefore, heat can be efficiently transferred to the entire fire spread suppressing material, and the heat insulating effect due to the presence of the flame-retardant liquid can be efficiently exhibited, which is preferable.

In particular, as the fire spread suppressing material is used, the fiber sheet is crushed in the direction of gravity, and there are cases where the fiber sheet does not exist in the portion of the fire spread suppressing material opposite to the direction of gravity. Since the fiber sheet does not exist at this location, it is difficult for the heat insulating effect due to the presence of the flame-retardant liquid to be efficiently exhibited. By adopting a criss-cross web or a nonwoven fabric prepared using the fibrous web as the fiber sheet, the direction of gravity and the fiber orientation direction of the unidirectional web in the criss-cross web provided with the fire spread suppressing material, or the direction of gravity and the fiber orientation direction of the unidirectional web in the nonwoven fabric prepared using the crisscross web can be prepared in parallel. Since the fiber sheet present in the fire spread suppressing material in such a fiber orientation mode is less likely to be crushed in the direction of gravity, heat can be efficiently transmitted to the entire fire spread suppressing material, and the flame retardant liquid can be used. It is possible to provide a fire spread suppressing material that can efficiently exhibit a heat insulating effect due to its presence. From this point of view, it is preferable to employ a criss-cross web or a non-woven fabric prepared using a criss-cross web as the fiber sheet.

As the fabric, a nonwoven fabric is preferable in that it has gaps between fibers and has many voids capable of holding a flame-retardant liquid. A nonwoven fabric in which the entirety is melted and the constituent fibers are not bonded to each other is more preferable. Examples of nonwoven fabrics in which the fibers are not bonded include an aspect in which the constituent fibers are entangled to form a fiber sheet (for example, entangled nonwoven fabric), and a specific example is a hydroentangled nonwoven fabric. , needle-punched nonwoven fabric, and the like.

Various properties of the fabric, such as basis weight and thickness, can be appropriately adjusted so as to provide a fire spread suppressing material that is more difficult to burn. The weight per 1 m ² of the fabric is preferably 10 to 500 g/m ² , more preferably 20 to 250 g/m ² . The thickness of the fabric is preferably 0.05-10 mm, more preferably 0.1-1.5 mm. The thickness is the arithmetic average value of five points measured with a thickness gauge (dial thickness gauge 0.01 mm type H type, manufactured by Ozaki Seisakusho Co., Ltd.).

The type of fiber constituting the fabric can be appropriately selected, but it is preferable to employ a fiber having flame retardancy (flame-retardant fiber).
The term "flame-retardant fiber" as used herein refers to a fiber composed of a resin and an inorganic component having an LOI value of 26 or more determined based on JIS K7201 limiting oxygen index. In order to provide a fire spread suppressing material that is more difficult to burn, it is preferable that the flame-retardant fiber is composed only of the aforementioned resin or inorganic component. The type of flame-retardant fiber is not limited, and for example, acrylic fiber such as oxidized acrylic fiber, polyphenylene sulfide (PPS) fiber, aramid fiber, flame-retardant viscose fiber, flame-retardant polyester fiber, inorganic fiber, etc. are used. can. The fabric may contain fibers other than flame-retardant fibers as constituent fibers. The fineness and fiber length of constituent fibers such as flame-retardant fibers contained in the fabric are not particularly limited, but the fineness is preferably 0.1 to 15 dtex, more preferably 0.5 to 10 dtex. Also, the fiber length is preferably 10 to 100 mm, more preferably 20 to 80 mm.

As long as the laminate containing the metal plate and/or carbon plate and fabric contains at least one layer of metal plate and/or carbon plate and at least one layer of fabric, each layer made of metal plate and / or carbon plate, or fabric Although the number of layers of each layer made of is not limited, the layer made of metal plate and / or carbon plate can be, for example, 1 to 4 layers, preferably 1 layer, and the layer made of fabric is For example, it can have 1 to 4 layers, preferably 2 layers.

Although the lamination mode is appropriately adjusted, even in a laminate in which one or more fabrics are laminated on one main surface of the metal plate and / or the carbon plate, the metal plate and / or the carbon plate It may also be a laminate in which one or two or more fabrics are laminated on each of the two main surfaces. In addition, a laminate obtained by winding both main surfaces of a metal plate and/or a carbon plate with cloth one or more times, or a laminate formed by sandwiching both main surfaces of a metal plate and/or a carbon plate with cloth. Alternatively, in this case, a laminate is obtained in which one or more fabrics are laminated on each of the main surfaces of the metal plate and/or the carbon plate.
In particular, since it is possible to provide a fire spread suppressing material that is more difficult to burn, the fire spread suppressing material preferably includes a laminate in which fabrics are layered on both main surfaces of a metal plate and/or a carbon plate.

The flame-retardant liquid used in the present invention is stable at a temperature (for example, -40 to 80 ° C.) expected when a battery pack equipped with a fire spread suppressing material is used, and preferably has no flash point. As long as it is a liquid having sensible heat and/or latent heat, it is not particularly limited, but examples include water, an aqueous solution, and water glass. The viscosity of the flame-retardant liquid that can be used in the present invention can be adjusted as appropriate. • can be s.

The flame-retardant liquid used in the present invention preferably contains inorganic particles. The inorganic particles are particles that are stable and preferably non-combustible at a temperature (e.g., -40 to 80 ° C.) expected when a battery pack equipped with a fire spread suppressing material is used, and in a flame-retardant liquid It is not particularly limited as long as it can be dispersed and exist and the heat applied to the fire spread suppressing material can be efficiently transmitted to the entire fire spread suppressing material. For example, silica particles, silica airgel particles, hydroxide Examples include aluminum particles.
The average particle size of the inorganic particles that can be used in the present invention can be appropriately selected. For example, inorganic particles with an average particle size of 0.04 μm to 2.0 mm can be used.

The flame-retardant liquid may contain inorganic particles, and the content of the inorganic particles in the flame-retardant liquid may be 0 parts by mass to 20 parts by mass with respect to 100 parts by mass of the flame-retardant liquid. , 0.3 to 10 parts by weight, and 0.75 to 5 parts by weight.

The flame-retardant liquid used in the present invention is preferably a low-fluidity liquid. If the flame-retardant liquid is a low-fluidity liquid, even if the film bag is burned by being hit by a flame, the flame-retardant liquid does not easily leak from the burnt-out portion, so heat is efficiently distributed to the entire fire spread suppression material. This is because the heat can be transmitted well, and the presence of the flame-retardant liquid can maintain the insulating effect.
The fluidity of the low-fluidity liquid is not particularly limited as long as the flame-retardant liquid does not leak or hardly leaks even if the film bag is punctured by burning. It can be adjusted by adding a gelling agent to the flammable liquid.
The viscosity of the low-fluidity liquid that can be used in the present invention can be adjusted as appropriate.
Further, the mode of the low fluidity liquid includes the mode of sol and gel in addition to the liquid.

Examples of the gelling agent include polysaccharides such as gelatin, pectin and curdlan, water-soluble polymers such as polyacrylic acid and acrylamide, and inorganic compounds such as clay and bentonite. It can be 0.1 to 20 parts by mass, can be 0.2 to 15 parts by mass, and is 0.5 to 10 parts by mass with respect to 100 parts by mass of the flame-retardant liquid. be able to. For example, a flame-retardant liquid to which a polysaccharide is added as a gelling agent can be made into a low fluidity liquid (jelly-like) by heating (for example, at 80° C. for 10 minutes).

The film bag used in the present invention is flame-retardant, has water impermeability and water vapor impermeability, and is particularly Although not limited, for example, laminated film bags in which organic resin films are laminated on both main surfaces of aluminum foil, and laminated film bags in which organic resin films are laminated on one main surface and/or both main surfaces of copper foil. etc. can be mentioned.

The fire spread suppressing material of the present invention is not limited to the following, for example:
(1) A step of preparing a laminate including a metal plate and/or carbon plate and fabric, a flame-retardant liquid, and a film bag;
(2) placing the laminate and the flame-retardant liquid in the film bag and sealing the film bag in that state;
It can be manufactured by a manufacturing method including

In the step (2), the order in which the laminate and the flame-retardant liquid are placed in the film bag can be changed, for example, by injecting the flame-retardant liquid after the laminate is put in, or The laminate can be placed after injecting the liquid, or the flame retardant liquid and the laminate can be placed simultaneously (e.g., the flame retardant liquid is absorbed by the laminate and the flame retardant liquid is retained). It is also possible to arrange the laminated body in a state in a film bag), and there is no particular limitation.

The fire spread suppressing material, which is one of the preferred embodiments of the present invention, in which the flame-retardant liquid contains a gelling agent is not limited to the following, for example:
(1) A step of preparing a laminate including a metal plate and/or a carbon plate and fabric, a flame-retardant liquid including a gelling agent that can be gelled by heating, and a film bag;
(2) placing the laminate and the flame-retardant liquid in the film bag and sealing the film bag in that state;
(3) a step of gelling the flame-retardant liquid by heating the film bag sealed in step (2);
It can be manufactured by a manufacturing method including

The heating temperature and heating time in the heat treatment in step (3) can be appropriately determined depending on the gelling agent used, but typically, heating is performed at 80° C. for 0.1 hour, followed by cooling.

The fire spread suppressing material of the present invention can be evaluated for fire spread suppressing performance, for example, by the evaluation method described in Examples below. According to the evaluation method, in the thermocouples A and B arranged at the center of both main surfaces of the fire spread suppression material, a flame is emitted from the burner to the center of the main surface of the fire spread suppression material from the thermocouple A side, and the thermocouple The time (seconds) required for the measured temperature of thermocouple B to reach 120 ° C from the time when the measured temperature of A reaches 900 ° C is measured. It is evaluated as a fire spread suppressing material that is excellent in fire resistance and difficult to burn.

EXAMPLES The present invention will be specifically described below with reference to examples, but these are not intended to limit the scope of the present invention.

(Preparation of flame-retardant liquid)
1.5 parts by mass of silica airgel as inorganic particles was dispersed in 100 parts by mass of water. A flame-retardant liquid was prepared by mixing 5.0 parts by mass of a gelling agent there.

(Prepare fabric)
A unidirectional web prepared by supplying a flame-retardant acrylic oxidized fiber (fineness: 2.2 dtex, fiber length: 51 mm, LOI value: 50 to 60) to a carding machine and folding the unidirectional web. A criss-cross-laid web was prepared by laminating the cross-laid web. A hydroentangled nonwoven fabric (thickness: 0.6 mm, basis weight: 50 g/m ² ) was prepared by providing the criss-cross lay web to a hydroentangling device. The hydroentangled nonwoven fabric prepared in this manner was a nonwoven fabric in which the oxidized acrylic fibers were simply entangled with each other to form a entangled fiber sheet, and the fibers were not bonded.
In addition, the prepared hydroentangled nonwoven fabric was punched out, and a rectangular cloth A (thickness: 0.6 mm, length: 125 mm, width: 75 mm) and a rectangular cloth B (thickness: 0.6 mm, length: 250 mm, width : 75 mm) were prepared.

(Preparing a metal plate)
A rectangular aluminum plate (thickness: 0.07 mm, length: 125 mm, width: 75 mm) was prepared.

(Prepare a film bag)
A laminated film was prepared by laminating polyethylene terephthalate (0.012 mm)-aluminum (0.009 mm)-polyethylene terephthalate (0.012 mm)-polyethylene (0.040 mm) in this order. Then, by making the polyethylene surfaces of the laminated film face each other, two laminated films are stacked and heat-sealed in a U-shape to melt and integrate the organic resin films that face each other at the heat-sealed portions, and release. By cooling, a rectangular film bag (length: 147 mm, width: 95 mm) was prepared.

(Example 1)
A laminate was prepared by laminating one sheet of fabric A and one sheet of aluminum plate with their main surfaces facing each other. The laminate was placed in a film bag, and 14 g of the flame-retardant liquid having the formulation shown in Table 1 was injected into the bag. After that, the opening of the film bag was sealed by heat sealing. After that, by heating in a dryer at 80 ° C. for 10 minutes, the flame-retardant liquid enclosed in the film bag is gelled and then allowed to cool, and the fire spread suppressing material (length: 147 mm, width: 95 mm, thickness thickness: 1.6 mm) was prepared. Note that the flame-retardant liquid in the fire spread suppressing material was gelled due to gelation (the same applies to Comparative Example 1 and Examples 2 to 7, which will be described later).

(Comparative example 1)
A fire spread suppressing material (length: 147 mm, width: 95 mm, thickness: 1.7 mm) was prepared in the same manner as in Example 1, except that one piece of fabric A was put in the film bag instead of the laminate. Comparative Example 1 is a fire spread suppressing material that does not contain a metal plate and/or a carbon plate in the present invention, and corresponds to the prior art described in Patent Document 2 mentioned above in the Background Art section.

(Example 2)
With the long sides of the fabric B and the aluminum plate parallel to each other, the aluminum plate is sandwiched between the fabric B folded in half in the long side direction, and both main surfaces of the aluminum plate are covered by the fabric B. A covered laminate was prepared. A fire spread suppressing material (length: 147 mm, width: 95 mm, thickness: 2.1 mm) was prepared in the same manner as in Example 1, except that the laminate thus prepared was used.

(Examples 3-4)
A fire spread suppressing material was prepared in the same manner as in Example 2, except that the amount (content) of the flame-retardant liquid injected into the bag was changed to the amount shown in Table 1.

(Examples 5-7)
Fire spread in the same manner as in Example 2, except that a flame-retardant liquid in which the blending amount of silica airgel and gelling agent was changed to the amount described in Table 1 was used as the flame-retardant liquid injected into the bag. An inhibitor was prepared.

(Method for evaluating fire spread suppression performance)
The fire spread suppressing materials of Example 1, Comparative Example 1 and Examples 2 to 7 prepared as described above were subjected to the following measurements to evaluate their fire spread suppressing performance.
The temperature of the measurement atmosphere was set to 20 to 25° C., and the temperature of the fire spread suppressing material and thermocouples A and B used for measurement was set to 20 to 25° C., and the following measurements were started.
(1) The fire spread suppressing material was erected so that one main surface of the fire spread suppressing material was parallel to the direction of gravity.
(2) A thermocouple A was provided on the center of one main surface of the fire spread suppressing material, and a thermocouple B was provided on the center of the other main surface of the fire spread suppressing material.
(3) A burner was installed so that a flame could act perpendicularly to the center of one main surface of the fire spread suppressing material.
(4) A flame was radiated from a burner and acted perpendicularly to the center of one main surface of the fire spread suppressing material. At this time, the distance between the burner and the fire spread inhibitor was adjusted so that the temperature measured by the thermocouple A was 900°C.
(5) A flame is applied in a vertical direction to the center of one main surface of the fire spread suppression material, and the temperature measured by the thermocouple B is 120°C from the time the temperature measured by the thermocouple A reaches 900°C. The time (seconds) required to reach the point was measured.
It should be noted that the longer the measured time, the longer the fire spread suppressing material, the better the heat insulating property and the less likely the fire spread suppressing material will burn.

Table 1 summarizes the configuration and evaluation results of the fire spread suppression performance of the fire spread suppression materials of Examples and Comparative Examples prepared as described above.

From the results of comparison between Example 1 (and Examples 2 to 7) and Comparative Example 1, the fire spread suppressing material that satisfies the configuration of the present invention has excellent heat insulating properties and is difficult to burn.
In addition, from the results of comparing Example 1 and Example 2, the fire spread suppressing material provided with fabric on both main surfaces of the metal plate and / or carbon plate has better heat insulating properties and is less likely to burn. rice field.
Furthermore, from the results of comparing Example 2 and Examples 5 to 7, regarding the blending of the flame retardant liquid contained in the fire spread suppressing material, the mass part ratio of the inorganic particles and the gelling agent is 0.75: 5.0 ~ When the ratio is 4.5:5.0 (especially when the ratio is 0.75:5.0 to 3.0:5.0), a fire spread suppressing material is provided that has excellent heat insulating properties and is difficult to burn. Turns out it can.

INDUSTRIAL APPLICABILITY The fire spread suppressing material of the present invention can be used in technical fields, such as battery packs such as lithium ion batteries, which may cause flames due to high temperatures and need to block flames.

Claims (6)

A fire spread suppressing material in which a laminate including a metal plate and/or a carbon plate and fabric, and a flame-retardant liquid are enclosed in a film bag. 2. The fire spread suppressing material according to claim 1, wherein inorganic particles are dispersed in said flame-retardant liquid. The fire spread suppression material according to claim 1 or 2, wherein the flame-retardant liquid is a low-fluidity liquid. The fire spread suppressing material according to any one of claims 1 to 3, wherein the flame retardant liquid contains a gelling agent. The fire spread suppressing material according to any one of claims 1 to 4, wherein the flame-retardant liquid, which is a liquid having no flash point, is enclosed in a film bag. The fire spread suppressing material according to any one of claims 1 to 5, wherein the fabric is a non-fiber-bonded non-woven fabric containing flame-retardant fibers.