Laminate for sealing material and method for manufacturing the same, sealing material and battery

Abstract

To provide a laminate for sealing materials having improved flame retardancy than in a conventional art.SOLUTION: A laminate (10) for sealing materials according to one embodiment includes: a first layer (1) that contains a flame-retardant silicone rubber compound; and a second layer (2) that contains a fiber-based flame retardant, in which a content of an organic component in the second layer (2) is 0 to 10 wt.%.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a laminate for sealing materials, a sealing material, and a battery.

Background Art

[0002] Conventionally, in order to impart flame retardancy to articles, a technique of providing a flame retardant layer on a base material has been proposed (see, for example, Patent Documents 1 and 2).

Prior Art Literature

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0004] Silicone rubber used for sealing materials may also be required to have flame retardancy depending on the application. Studies conducted by the present inventors have revealed that existing silicone rubber has room for further improvement from the viewpoint of flame retardancy.

[0005] An object of one aspect of the present invention is to provide a laminate for sealing materials having improved flame retardancy compared to conventional laminates.

Means for Solving the Problem

[0006] The laminate for a sealing material according to one aspect of the present invention is: a first layer containing a flame-retardant silicone rubber compound, a second layer containing a fibrous flame retardant, comprising: the content of organic components in the second layer is 0 to 10% by weight.

Effect of the Invention

[0007] According to one aspect of the present invention, a laminate for sealing materials with improved flame retardancy compared to conventional materials is provided. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing an example of the general structure of a laminate for sealing material according to one aspect of the present invention. [Figure 2] This is a schematic diagram showing a modified example of the general structure of a laminate for sealing material according to one aspect of the present invention. [Figure 3] This is a schematic diagram showing another example of the general structure of a laminate for sealing material according to one aspect of the present invention. [Figure 4] This is a schematic diagram showing another modified example of the general structure of a laminate for sealing material according to one aspect of the present invention. [Figure 5] This is a schematic diagram showing an example of a battery using a sealing material according to one aspect of the present invention. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below. However, the present invention is not limited to the embodiments described below, and various modifications are possible within the scope described. Embodiments that appropriately combine the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0010] In this specification, "A~B" representing a numerical range means "greater than or equal to A, and less than or equal to B."

[0011] ≪1. Laminates for sealing materials≫ Figure 1 is a schematic diagram showing an example of the general structure of a laminate for sealing material according to one aspect of the present invention. The laminate for sealing material 10 (sealing material 10) comprises a first layer 1 and a second layer 2. The second layer 2 and the first layer 1 will be described below in that order.

[0012] [1.1.Second layer] The second layer contains a fiber-based flame retardant. The organic component content in the second layer is 0-10% by weight.

[0013] (Fiber-based flame retardant) A fibrous flame retardant refers to a flame retardant that takes the form of a fiber. In this specification, "fibrous form" means a shape with an aspect ratio (length / diameter) of 3 or more.

[0014] The lower limit of the average fiber length of the fiber-based flame retardant is preferably 50 μm or more, more preferably 70 μm or more, and even more preferably 100 μm or more. The upper limit of the average fiber length of the fiber-based flame retardant is preferably 1500 μm or less, more preferably 1000 μm or less, and even more preferably 800 μm or less. The lower limit of the average diameter of the fiber-based flame retardant is preferably 0.05 μm or more, more preferably 0.1 μm or more, even more preferably 0.15 μm or more, and particularly preferably 0.2 μm or more. The upper limit of the average diameter of the fiber-based flame retardant is preferably 10.0 μm or less, more preferably 5.0 μm or less, even more preferably 3.0 μm or less, and particularly preferably 1.0 μm or less. The lower limit of the aspect ratio is preferably 5 or more, more preferably 50 or more, even more preferably 100 or more, and particularly preferably 150 or more. The upper limit of the aspect ratio is preferably 5000 or less, more preferably 4000 or less, even more preferably 1000 or less, particularly preferably 500 or less, and even more preferably 250 or less.

[0015] Examples of fiber-based flame retardants include artificial mineral fibers and natural mineral fibers. Examples of artificial mineral fibers include rock wool, stone wool, slag wool, mineral wool, glass wool, mineral glass wool, alkali earth silicate wool (AES wool), and alumina fibers. Examples of natural mineral fibers include wollastonite and potassium titanate fibers. Among these, artificial mineral fibers are preferred. Among artificial mineral fibers, one or more selected from the group consisting of AES wool, rock wool, and alumina fibers are preferred. In one embodiment, the fiber-based flame retardant is an inorganic substance. In one embodiment, the fiber-based flame retardant is not asbestos.

[0016] The lower limit of the content of the fibrous flame retardant in the second layer, based on the total weight of the second layer, is preferably 5% by weight or more, more preferably 10% by weight or more, and still more preferably 20% by weight or more. The upper limit of the content of the fibrous flame retardant in the second layer, based on the total weight of the second layer, is preferably 70% by weight or less, more preferably 60% by weight or less, and still more preferably 50% by weight or less. When the content of the fibrous flame retardant falls within the above range, sufficient flame retardancy tends to be imparted to the laminate for sealing materials.

[0017] (Organic component) The second layer may contain an organic component. The organic component functions, for example, as a binder for molding the fibrous flame retardant into a sheet shape.

[0018] The upper limit of the content of the organic component in the second layer, based on the weight of the second layer, is 10% by weight or less, and preferably 8% by weight or less. The lower limit of the content of the organic component in the second layer, based on the weight of the second layer, may be 0% by weight or more, 1% by weight or more, or 2% by weight or more. As described above, the second layer can be said to be a layer having a low content of organic components. By providing such a second layer, the flame retardancy of the laminate for sealing materials can be improved.

[0019] The content of the organic component in the second layer can be estimated from the ignition loss of the second layer. In one embodiment, the content of the organic component in the second layer is the ignition loss of the second layer itself.

[0020] (Other components) The second layer may contain components other than the fibrous flame retardant and the organic component. Examples of such components include inorganic binders. The inorganic binder is not particularly limited, and examples thereof include alumina, silica, and metal alkoxides.

[0021] The upper limit of the thickness of the second layer is preferably 5 mm or less, more preferably 3 mm or less, and still more preferably 1 mm or less. The lower limit of the thickness of the second layer may be 0.05 mm or 0.1 mm. When the thickness of the second layer falls within the above range, the laminate for sealing materials can be reduced in thickness.

[0022] [1.2. 1st layer] The first layer contains a flame-retardant silicone rubber compound.

[0023] A flame-retardant silicone rubber compound is a silicone rubber composition in which various additives are blended with silicone rubber to impart flame retardancy. In one embodiment, the flame-retardant silicone rubber compound is HB or higher according to the UL94 standard. That is, the flame-retardant silicone rubber compound is 5VA, 5VB, V-0, V-1, V-2, or HB according to the UL94 standard. In one embodiment, the flame-retardant silicone rubber compound is V-0 or higher according to the UL94 standard. That is, the flame-retardant silicone rubber compound is 5VA, 5VB, or V-0 according to the UL94 standard. In one embodiment, the flame-retardant silicone rubber compound is V-0 according to the UL94 standard.

[0024] The UL94 standard is a globally adopted standard for evaluating the flame retardancy of plastic products. The UL94 standards, in order of increasing flame retardancy, are 5VA, 5VB, V-0, V-1, V-2, and HB. The UL94 test methods are well known to those skilled in the art, and therefore will not be explained here.

[0025] Examples of silicone rubbers included in flame-retardant silicone rubber compounds include methyl silicone rubber, vinyl methyl silicone rubber, phenyl methyl silicone rubber, and fluorinated silicone rubber. These silicone rubbers may be present in a single type or in a combination of two or more types. In one embodiment, the flame-retardant silicone rubber compound contains vinyl methyl silicone rubber. Examples of additives included in flame-retardant silicone rubber compounds include platinum, platinum compounds, iron oxide, triazole compounds, and aluminum hydroxide. These additives may be present in a single type or in a combination of two or more types. Many silicone rubber compounds corresponding to the second flame-retardant silicone rubber compound are on the market, and many related patent documents exist. Therefore, a detailed explanation of the composition of the flame-retardant silicone rubber compound is omitted.

[0026] Examples of flame-retardant silicone rubber compounds that meet the UL94 standard V-0 or higher include: SILASTIC (TM) SH502U, SH502U A / B, SH1447 UA (all from Dow Toray Corporation); KE-5620W-U, KE-5620BL-U, KE-5612E-U, KE-3494, KE3490, KE3467, KE-4890, KE-40RTV, KE-1831, KE-1867, KE-1891, KE-1204-LTV, KE-1292, KE-1800, KE-1802 (all from Shin-Etsu Chemical Co., Ltd.); ELASTOSIL (R) LR 3011 / 50 FR, LR 3001 / 55 FR, LR 3001 / 60 FR, LR Examples include 3170 / 40 (all from Asahi Kasei Wacker Silicone Co., Ltd.); TSE2186U, TSE2183U, TSE2187U, TSE2184U, TCM5406U, and XE20-A7016 (all from Momentive Performance Materials Japan LLC).Examples of flame-retardant silicone rubber compounds that meet the UL94 standard HB~V-1 include XIAMETER (TM) RBB-6630-30, RBB-6640-40, RBB-6650-50, RBB-6660-60, RBB-6670-70, RBB-6680-80, RBB-6671-70 (all from Dow Toray Corporation); SILASTIC (TM) SE 4704 U, SE 4705 U, SE 4706 U, SE 4708 U, DY 32-6014 U, DY 32-7040 U, ​​DY 32-8013 U, SRX 495 U, and DY 32-502. U (All of the above are from Dow Toray Industries, Inc.); KE-5634-U, KE-941-U, KE-951-U, KE-961-U, KE-971-U, KE-981-U, KE-971T-U (All of the above are from Shin-Etsu Chemical Co., Ltd.); ELASTOSIL (R) LR 3003 / (x), LR 3004 / (y), LR 3005 / (y), LR 3065 / (e), LR 3092 / 65 Examples include BK (all from Asahi Kasei Wacker Silicone Co., Ltd.); TSE221-3U, TSE221-4U, TSE221-5U, TSE221-6U, TSE221-7U, TSE221-8U, TSE2277U, XE20-523-4U, XE20-523-5U, TSE2181U, TCM5417U, TSE2911U, and TSE2971U (all from Momentive Performance Materials Japan LLC).

[0027] Examples of patent documents disclosing silicone rubber compounds that fall under the category of flame-retardant silicone rubber compounds include Japanese Patent Publication No. 2004-149693, Japanese Patent Publication No. 2006-182911, and Japanese Patent Publication No. 2009-144024.

[0028] The first layer may contain components other than those mentioned above. Examples of such components include curing agents and various additives.

[0029] The curing agent is a component that imparts rubber elasticity to the first layer. A person skilled in the art can appropriately select the curing agent according to the reaction mechanism for imparting rubber elasticity. Examples of reaction mechanisms by curing agents include crosslinking reactions, condensation reactions, and addition reactions.

[0030] When rubber elasticity is imparted by an addition reaction, organohydrogenpolysiloxanes and platinum-based catalysts can be used. Organohydrogenpolysiloxanes are polyorganosiloxanes in which, on average, two or more hydrogen atoms are bonded to silicon atoms per molecule.

[0031] Flame-retardant silicone rubber compounds may contain oil. Among oils, silicone oil is preferred, and modified silicone oil is more preferred. Silicone oil refers to an oil whose main component is polyorganosiloxane. Modified silicone oil refers to a silicone oil in which some of the methyl groups contained in dimethyl silicone oil have been replaced with other functional groups. Examples of modified silicone oils include amino-modified silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil, carbinol-modified silicone oil, (meth)acrylic-modified silicone oil, mercapto-modified silicone oil, phenol-modified silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, alkyl-modified silicone oil, higher fatty acid ester-modified silicone oil, higher alkoxy-modified silicone oil, fluorine-modified silicone oil, and aralkyl-modified silicone oil. Modified silicone oils include non-reactive modified silicone oils and reactive modified silicone oils. Among these, non-reactive modified silicone oils are preferred.

[0032] The first layer may contain various additives known in the art. Examples of such additives include reinforcing fillers (silica, diatomaceous earth, quartz powder, mica, titanium oxide, etc.); bulking fillers (diatomaceous earth, quartz powder, mica, clay, glass beads, aluminum oxide, etc.); heat resistance improvers (carbon black, red iron oxide, alkali metal oxides, alkaline earth metal oxides, etc.); and pigments.

[0033] (Composition of the first layer) Based on the total weight of the first layer, the lower limit of the flame-retardant silicone rubber compound content is preferably 50% by weight or more, more preferably 80% by weight or more, and even more preferably 90% by weight or more. The upper limit of the flame-retardant silicone rubber compound content may be, for example, 99.9% by weight or less.

[0034] If the first layer contains rubber components other than silicone rubber, the proportion of silicone rubber in the total rubber components is preferably 50% by weight or more, more preferably 70% by weight or more, and even more preferably 90% by weight or more. In one embodiment, the first layer does not contain rubber components other than silicone rubber. Examples of rubber components other than silicone rubber include fluororubber (FKM), natural rubber (NR), styrene-butadiene rubber (SBR), isoprene rubber (IR), butadiene rubber (BR), chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), urethane rubber (U), ethylene-acrylic rubber (AEM), and acrylic rubber (ACM).

[0035] The lower limit of the oil content in the first layer is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, and even more preferably 0.5% by weight or more, based on the total weight of the first layer. If the oil content is less than 0.1% by weight, the processability may decrease. The upper limit of the oil content in the first layer is preferably 15% by weight or less, more preferably 10% by weight or less, and even more preferably 5% by weight or less, based on the total weight of the first layer. If the oil content exceeds 15% by weight, it may become excessively soft or bleed may occur.

[0036] In one embodiment, the first layer is substantially free of fibrous flame retardants. The content of fibrous flame retardants in the first layer is preferably 1 part by weight or less, more preferably 0.5 parts by weight or less, and even more preferably 0.1 parts by weight or less, based on the content of the flame-retardant silicone rubber compound being 100 parts by weight. In one embodiment, the first layer is free of fibrous flame retardants.

[0037] The amounts of other components in the first layer can be appropriately set in accordance with common technical knowledge by those skilled in the art. For example, the amount of curing agent can be 0.2 to 5.0 parts by weight, assuming the amount of flame-retardant silicone rubber compound is 100 parts by weight.

[0038] [1.3. Structure and physical properties of laminates for sealing materials] The laminate for sealing material may have the first layer and the second layer in direct contact, or it may have an adhesive layer interposed between the first layer and the second layer. Figure 1 is a schematic diagram showing the general structure of a laminate for sealing material 10 in which the first layer 1 and the second layer 2 are in direct contact. Figure 2 is a schematic diagram showing the general structure of a laminate for sealing material 10a in which the first layer 1 and the second layer 2 are in contact via an adhesive layer 3. The adhesive layer 3 preferably has excellent flame retardancy. In this specification, the layer interposed between the first layer and the second layer in a laminate for sealing material is generally referred to as the "adhesive layer". In one embodiment, the adhesive layer includes a flame-retardant adhesive (such as an inorganic adhesive). Examples of inorganic adhesives include silane coupling agents. Furthermore, while Figures 1 and 2 illustrate a configuration in which the thickness of the second layer 2 is thinner than the thickness of the first layer 1, the configuration is not limited to this; the thickness of the second layer 2 may be the same as the thickness of the first layer 1, or it may be thicker than the thickness of the first layer.

[0039] In one embodiment, the sealant laminate comprises one first layer and two second layers. Figure 3 is a schematic diagram showing the general structure of a sealant laminate 10b comprising a first layer 1 and second layers 2a and 2b. In the sealant laminate 10b, the second layers 2a and 2b are provided on both sides of the first layer 1. The first layer 1 and the second layer 2a are in direct contact, and the first layer 1 and the second layer 2a are in direct contact. The compositions of the second layers 2a and 2b may be the same or different.

[0040] Figure 4 is a schematic diagram showing the general structure of a laminated sealant 10c comprising a first layer 1, second layers 2a and 2b, and adhesive layers 3a and 3b. In the laminated sealant 10c, the second layers 2a and 2b are provided on both sides of the first layer 1. An adhesive layer 3a is interposed between the first layer 1 and the second layer 2a, and an adhesive layer 3b is interposed between the first layer 1 and the second layer 2b. The compositions of the second layers 2a and 2b may be the same or different.

[0041] As a variation, in the laminate 10c for sealing material, one of the adhesive layers 3a and 3b may be omitted. That is, one of the second layers 2a and 2b may be in direct contact with the first layer 1.

[0042] The Shore A hardness of the laminate for sealing materials is preferably 85 or less, and more preferably 80 or less. If the Shore A hardness is within the above range, it can be said that it has a suitable softness for use as a sealing material. In this specification, Shore A hardness is measured using a Type A durometer based on JIS K6253, with the surface of the second layer as the measurement surface. The Shore A hardness of the silicone rubber laminate is measured on the cured silicone rubber laminate under normal conditions (without subjecting it to a combustion test).

[0043] A laminate for sealing material according to one aspect of the present invention exhibits improved flame retardancy compared to the silicone rubber composition alone (i.e., the first layer alone). In this specification, "improved flame retardancy" means that one or more, preferably both, of the following conditions 1 and 2 are met. Flame retardancy can be evaluated by a combustion test; please refer to the examples described herein for the method of conducting the combustion test. (Condition 1) The time it takes for smoke to be generated is delayed. (Condition 2) The time it takes for flames to appear is delayed, or flames do not appear at all.

[0044] ≪2. Sealing materials and batteries≫ A sealing material according to one aspect of the present invention includes the above-described laminate for sealing materials. In this specification, a sealing material is intended to be a molded article used interposed between two or more members. The two or more members may be members whose relative positions change, or members that are relatively stationary. The sealing material has the function of sealing the movement of a fluid (gas, liquid, or mixture thereof).

[0045] The applications of the sealing material are not particularly limited. The sealing material according to one embodiment of the present invention has improved flame retardancy and is therefore preferable for use in products where flame retardancy is required. Examples of such products include batteries, vehicles, building materials, home appliances, and mobile devices.

[0046] The following describes an example of using a sealing material according to one embodiment of the present invention in a battery, with reference to Figure 5. The battery 100 comprises a sealing material 10 (a laminate for sealing material 10), cells 20, a heat insulating material 30, and a container 40. The battery 100 is configured to extract power from two or more cells 20 (12 cells 20 in Figure 5). Note that in Figure 5, the components for extracting power from the cells 20 are omitted. A specific example of the battery 100 is a non-aqueous electrolyte secondary battery (such as a lithium-ion secondary battery).

[0047] The sealing material 10 is a sealing material according to one aspect of the present invention. The cell 20 is a power generation element in which a positive electrode, negative electrode, separator, electrolyte, etc., are packaged together. The heat insulating material 30 is a component that prevents heat generated by the cell 20 from being transmitted. The container 40 is a component that houses the sealing material 10, the cell 20, and the heat insulating material 30.

[0048] The interior of the container 40 is divided into two or more compartments by the insulation material 30. In Figure 5, it is divided into four compartments: compartment A, compartment B, compartment C, and compartment D. The two or more cells 20 are arranged in two or more of these compartments. In Figure 5, cells 20 are placed in all four compartments A to D, but there may be compartments where cells 20 are not placed. The sealing material 10 is arranged to close the gap between the insulation material 30 and the container 40. At this time, the sealing material 10 is arranged so that the first layer 1 is in contact with the insulation material 30. Since the first layer 1 is relatively softer than the second layer 2, it can follow the positional changes of the insulation material 30, improving the sealing performance. On the other hand, the second layer 2 is arranged to block the space A to D from the first layer 1, so that the first layer 1 does not come into contact with the flame.

[0049] For example, if cell 20 located in section A malfunctions and catches fire, the sealing material 10 and the heat insulating material 30 prevent the fire from spreading to section B. Since the sealing material 10 is a sealing material according to one aspect of the present invention, it has improved flame retardancy compared to conventional sealing materials, and furthermore, it maintains its expansion after combustion. Therefore, the battery 100 is safer than conventional batteries.

[0050] ≪3. Method for manufacturing the first layer, second layer, and laminate for sealing material≫ The method for producing the first layer is not particularly limited. For example, the first layer can be produced by kneading and curing a first composition containing the components described in Section [1.2]. A kneader can be used to knead the components. Examples of kneaders include open rolls, kneaders, planetarium mixers, Banbury mixers, and extruders. The kneading temperature may be 25 to 200°C. The kneading time may be 1 minute to 1 hour. The curing temperature may be 25 to 200°C. The curing time may be 10 seconds to 120 minutes.

[0051] The second layer can be manufactured, for example, by forming a fibrous flame retardant or by solidifying a fibrous flame retardant with a binder. Alternatively, a commercially available product may be used as the second layer. Examples of commercially available products include Superwool Plus, Superwool HT, and Superwool HT-I (all manufactured by Shin Nippon Thermal Ceramics Co., Ltd.); and heat-resistant rock wool paper, AES paper, and alumina fiber paper (all manufactured by Tomoegawa Paper Co., Ltd.).

[0052] The method for laminating the first and second layers is not particularly limited. In one embodiment, the first and second layers are laminated by insert molding. In another embodiment, the first and second layers are laminated by first forming the first layer and then bonding the second layer to the first layer via an adhesive layer.

[0053] The hardened first layer may be further cured. The secondary curing temperature may be 25 to 250°C. The secondary curing time may be 30 minutes to 4 hours.

[0054] ≪4. Summary≫ The present invention includes the following configuration. <1> A first layer (1) containing a flame-retardant silicone rubber compound, The second layer (2, 2a, 2b) contains a fiber-based flame retardant, It is equipped with, The organic component content in the above second layer (2, 2a, 2b) is 0-10% by weight. Laminated material for sealing (10, 10a, 10b, 10c). <2> The thickness of the above second layer (2, 2a, 2b) is 5 mm or less. <1> Laminated sealants (10, 10a, 10b, 10c) as described above. <3> The above flame-retardant silicone rubber compound is V-0 or higher according to the UL94 standard. <1> or <2> Laminated sealants (10, 10a, 10b, 10c) as described above. <4> The above-mentioned fiber-based flame retardant contains one or more selected from the group consisting of artificial mineral fibers and natural mineral fibers. <1> ~ <3> Laminate for sealing materials as described in any of the following (10, 10a, 10b, 10c). <5> The above-mentioned fiber-based flame retardant contains the above-mentioned artificial mineral fibers, The above artificial mineral fiber includes one or more selected from the group consisting of AES wool, rock wool, and alumina fiber. <4> Laminated sealants (10, 10a, 10b, 10c) as described above. <6> The content of the flame-retardant silicone rubber compound in the first layer (1) above is 50% by weight or more. <1> ~ <5> Laminate for sealing materials as described in any of the following (10, 10a, 10b, 10c). <7> The first layer (1) and the second layers (2, 2a, 2b) described above are integrally molded by insert molding. <1> ~ <6> Laminate for sealing materials as described in any of the following (10, 10a, 10b, 10c). <8> The laminate for sealing material (10, 10a, 10b, 10c) according to claim 1, wherein the first layer (1) and the second layers (2, 2a, 2b) are integrally molded via an adhesive layer (3, 3a, 3b). <9> The process of forming the first layer (1), The process involves bonding the first layer (1) and the second layer (2, 2a, 2b) via an adhesive layer (3, 3a, 3b), A method for manufacturing a laminate for sealing material (10, 10a, 10b, 10c), including, The above first layer (1) contains a flame-retardant silicone rubber compound. The above second layer (2, 2a, 2b) contains a fiber-based flame retardant. The organic component content in the above second layer (2, 2a, 2b) is 0-10% by weight. Manufacturing method. <10> <1> ~ <8> A sealing material (10, 10a, 10b, 10c) comprising a laminate for sealing material (10, 10a, 10b, 10c) described in any one of the above. <11> Two or more cells (20), insulation material (30), container (40), <10> A battery (100) comprising the sealing materials (10, 10a, 10b, 10c) described above, The two or more cells (20) mentioned above, the insulating material (30) and the sealing materials (10, 10a, 10b, 10c) are stored in the container (40). The above-mentioned insulating material (30) is arranged to divide the container (40) into two or more compartments. The two or more cells (20) mentioned above are divided and arranged into two or more of the two or more sections mentioned above. The above sealing materials (10, 10a, 10b, 10c) close the gap between the above insulating material (30) and the above container (40), and are arranged so that the first layer (1) is in contact with the above insulating material (30). Batteries (100). [Examples]

[0055] One embodiment of the present invention will be described in detail below with reference to examples. However, the present invention is not limited to these examples.

[0056] [Materials used] ● Flame-retardant silicone rubber compound • Flame-retardant silicone rubber compound (KE-5612E-U, Shin-Etsu Chemical Co., Ltd., vinyl methyl silicone rubber compound, UL94 standard: V-0) ● Insulation sheet • Insulation sheet 1 (Superwool HT-I, Shin Nippon Thermal Ceramics Co., Ltd., loss on ignition: 4% by weight, thickness: 0.25 mm, made from fibers containing SiO2, CaO and MgO) • Insulation Sheet 2: (Heat-resistant rock wool paper, Tomoegawa Paper Co., Ltd., Loss on ignition: 5.7% by weight, Thickness: 0.85 mm, Heat-resistant rock wool in sheet form) • Insulation Sheet 3: (AES paper, Tomoegawa Paper Co., Ltd., loss on ignition: 6.2% by weight, thickness: 1.0 mm, AES fiber formed into a sheet) ● Hardener • Hardener (C-3, Shin-Etsu Chemical Co., Ltd., dicumyl peroxide)

[0057] [Examples 1-3] A laminate containing a vulcanized rubber sheet and an insulating sheet was fabricated by insert molding according to the procedure described below. This laminate will be used as the material for producing test specimens in the tests described later. 1. The components of the first layer listed in Table 1 were kneaded in an open roll. The kneading temperature was 20-100°C. The kneading time was 10-30 minutes. 2. From the resulting mixture, a first layer of unvulcanized rubber sheet was prepared. 3. The insulation sheets listed in Table 1 were used as the second layer. The insulation sheets were placed in sheet molds with a depth of 1-3 mm, and the first layer of unvulcanized rubber sheets was placed on top of them. Sheet molds of different depths were used to match the thickness of the insulation sheets used, so that the thickness of the first layer was 1 mm. 6. The first layer of unvulcanized rubber sheet was press-vulcanized at 165°C for 10 minutes. 7. Furthermore, secondary vulcanization was performed at 200°C for 4 hours. In this way, a laminate was obtained in which vulcanized rubber sheets (thickness: 1-3 mm) and heat insulating sheets were laminated together.

[0058] [Comparative Example 1] A vulcanized rubber sheet without a laminated insulation sheet was prepared according to the following procedure. This sheet will be used as the material for preparing test specimens in the tests described later. 1. The components of the first layer listed in Table 1 were kneaded in an open roll. The kneading temperature was 20-100°C. The kneading time was 10-30 minutes. 2. An unvulcanized rubber sheet was prepared from the resulting mixture. 3. The unvulcanized rubber sheet was press-vulcanized at 165°C for 10 minutes. 4. Furthermore, secondary vulcanization was performed at 200°C for 4 hours. In this way, vulcanized rubber sheets (thickness: 1-3 mm) were obtained.

[0059] [Test Method] The test specimens were subjected to combustion tests to evaluate their flame retardancy. The specific procedure is as follows: 1. A sheet measuring 15 mm in width and 100 mm in length was cut from a 2 mm thick vulcanized rubber sheet laminate or vulcanized rubber sheet to serve as a test specimen. 2. The test specimen was fixed to the jig, and the burner flame was adjusted so that the temperature of the combustion area reached 800°C. 3. The test specimen was exposed to a flame for 2 minutes. The time when the flame was applied was defined as 0 seconds, and the time (seconds) when smoke appeared and the time (seconds) when the flame appeared were recorded. The recorded results are shown in Table 1.

[0060] After subjecting the test specimens to the combustion test, the presence or absence of deflection was visually assessed and evaluated on the following four-point scale. The evaluation results are shown in Table 1. 4. There is no deflection, or the deflection is minimal. 3. The deflection is small. 2. The deflection is moderate. 1. The deflection is excessive.

[0061] Furthermore, the test specimens were visually inspected after the combustion test and evaluated on a four-point scale. The evaluation results are shown in Table 1. 4. Excellent condition. Only whitening is present, with no cracks, or the cracks are minimal. 3. Good. Small to moderate cracks are present. 2... Normal. There is a large crack. 1. Defective. Numerous cracks, peeling, breaks, and shattering are present.

[0062] [Table 1]

[0063] 〔result〕 Comparing Examples 1-3 with Comparative Example 1, it can be seen that the flame retardancy is improved by adding a second layer. Specifically, the time at which smoke was generated was later in Examples 1-3 than in Comparative Example 1. Regarding the generation of flames, no flames were generated in Examples 1-3 until the end of the test, while in Comparative Example 1, flames were generated 15 seconds after the start of the test.

[0064] Furthermore, when comparing the deflection and appearance of the test specimens after combustion, the sealing materials according to Examples 1 to 3 showed superior properties compared to the sealing material according to Comparative Example 1.

[0065] In this embodiment, an insulating sheet was used as the second layer. As described in the section on [Materials Used], the ignition loss of these insulating sheets is 10% by weight or less, so it can be said that the organic component content is also 10% by weight or less. By using such a material as the second layer, the flame retardancy of the laminate for sealing material according to one embodiment of the present invention was greatly improved. [Industrial applicability]

[0066] The present invention can be used, for example, in sealing materials for batteries and the like. [Explanation of Symbols]

[0067] 1: 1st layer 2, 2a, 2b: 2nd layer 3, 3a, 3b: Adhesive layer 10, 10a: Laminate for sealing material (sealing material) 20: Cell 30: Insulation 40: Container 100:Battery

Claims

1. The first layer contains a flame-retardant silicone rubber compound, The second layer contains a fiber-based flame retardant, It is equipped with, The content of organic components in the second layer described above is 0 to 10% by weight. The first layer and the second layer described above are integrally molded by insert molding. A laminated material for sealing applications where flame retardancy is required.

2. The laminate for sealing material according to claim 1, wherein the thickness of the second layer is 5 mm or less.

3. The above flame-retardant silicone rubber compound is V-0 or higher according to the UL94 standard, as described in claim 1, for use as a sealing material laminate.

4. The laminate for sealing material according to claim 1, comprising one or more fibrous flame retardants selected from the group consisting of artificial mineral fibers and natural mineral fibers.

5. The above-mentioned fiber-based flame retardant contains the above-mentioned artificial mineral fibers, The above artificial mineral fiber includes one or more selected from the group consisting of AES wool, rock wool, and alumina fiber. The laminate for sealing material according to claim 4.

6. The above-mentioned fiber-based flame retardant is one or more selected from the group consisting of AES wool, rock wool, and alumina fibers. The laminate for sealing material according to claim 5.

7. The laminate for sealing material according to claim 1, wherein the content of the flame-retardant silicone rubber compound in the first layer is 50% by weight or more.

8. The laminate for sealing material according to Claim 1, wherein the product containing the part for which the flame retardancy is required is a battery, a vehicle, a building material for housing, a home appliance, or a mobile terminal.

9. The process of forming the first layer, The process involves bonding the first layer and the second layer via an adhesive layer, A method for manufacturing a laminate for sealing materials to be used in products that require flame retardancy, including, The first layer described above contains a flame-retardant silicone rubber compound. The second layer described above contains a fiber-based flame retardant. The content of organic components in the second layer described above is 0 to 10% by weight. The first layer and the second layer described above are integrally molded by insert molding. Manufacturing method.

10. A sealing material comprising a laminate for sealing materials according to any one of claims 1 to 8.

11. A battery comprising two or more cells, an insulating material, a container, and the sealing material described in claim 10, The two or more cells mentioned above, the insulating material mentioned above, and the sealing material mentioned above are stored in the container mentioned above. The above-mentioned insulating material is arranged to divide the inside of the container into two or more compartments. The two or more cells mentioned above are divided and arranged into two or more sections. The sealing material described above closes the gap between the insulating material and the container, and is positioned so that the first layer is in contact with the insulating material. battery.

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