Fire extinguishing agent

Abstract

The present invention provides a novel fire extinguishing agent and fire extinguishing method that is useful for fires in areas where water cannot be used. Preferably, the present invention provides a novel fire extinguishing agent and fire extinguishing method that is relatively lighter than fire extinguishing sand and easy to place on the fire-affected area. [Solution] Specific gravity is 0.3 g / cm³ 3 More than 1.2g / cm 3 The fire extinguishing agent contains foamed glass as described below. A fire extinguishing agent containing granular foamed glass with a particle size greater than 0.106 mm and less than or equal to 3.35 mm is more preferable.

Description

[Technical Field] 【0001】 This invention relates to a fire extinguishing agent containing foamed glass, and more specifically, to a fire extinguishing agent with a specific gravity of 0.3 g / cm³. 3 More than 1.2g / cm 3 This concerns fire extinguishing agents, including the following foamed glass. [Background technology] 【0002】 In recent years, the creation of a decarbonized society has become a focus from the perspective of protecting the global environment. For this reason, solar cells are attracting attention as power generation devices that do not use fossil fuels and do not produce carbon dioxide. Similarly, battery-electric vehicles (BEVs) equipped with batteries such as lithium-ion batteries are gaining attention as automobiles that do not use fossil fuels and do not produce carbon dioxide while in operation. Both of these are characterized by not using fossil fuels and not emitting carbon dioxide while in operation. 【0003】 Several challenges have become apparent regarding these solar cells and BEVs. One of these challenges is that once a fire starts, it is difficult to extinguish. For example, it is known that when a fire broke out on a cargo ship carrying a BEV, the fire could not be extinguished and the cargo ship sank into the sea, and when a BEV in a multi-story parking garage caught fire, the fire could not be extinguished and the entire parking garage caught fire. [Prior art documents] [Patent Documents] 【0004】 [Patent Document 1] Japanese Patent Publication No. 2019-97862 [Patent Document 2] International Publication No. 2014 / 010424 [Overview of the Initiative] [Problems that the invention aims to solve] 【0005】 Generally, ships and multi-story parking garages are equipped with fire extinguishing systems that use water cannons. However, it is known that fires from solar cells and battery electric vehicles (BEVs) are difficult to extinguish with water cannons. The lithium-ion batteries in solar cells and BEVs have problems such as rapidly overheating and malfunctioning when they react with water, and generating hydrogen gas which can ignite. 【0006】 Dry sand (so-called fire-fighting sand) is known as a fire-fighting agent that can be used for objects that are difficult to extinguish with water. Fire-fighting sand is sprinkled (or scattered) over the object to cover it, thereby cutting off the oxygen supply and extinguishing the fire. However, since fire-fighting sand is relatively heavier than water, preparing the sand and sprinkling (scattering or placing) it over the object to extinguish the fire—that is, actually carrying out the fire-fighting work—is not always easy. The Fire Service Act states that it is effective to extinguish a fire by scattering dry sand over the source of the fire using a shovel, and stipulates that dry sand and shovels must be kept on hand. 【0007】 Patent Document 1 discloses a fire extinguishing ball containing dry sand and a fire extinguishing device for launching it. Furthermore, Patent Document 1 discloses a fire extinguishing method that includes launching the fire extinguishing ball towards a fire target, causing the fire extinguishing ball to burst on the fire target to scatter fire extinguishing sand, and covering the fire target with fire extinguishing sand. Patent Document 2 discloses a fire extinguishing nozzle capable of uniformly dispersing fire extinguishing sand over an object to be extinguished. Furthermore, Patent Document 2 discloses a fire extinguishing method that includes using the fire extinguishing device to uniformly disperse fire extinguishing sand over the entire upper surface of a fire source having a flat upper space. 【0008】 Patent documents 1 and 2 both disclose a fire extinguishing device and a fire extinguishing method that use fire extinguishing sand, and improve fire extinguishing work that uses fire extinguishing sand with a shovel. On the other hand, there is a need for new fire extinguishing agents and methods that do not pose a risk of electric shock when dealing with fires in buildings where water is unavailable. Preferably, there is a need for a new fire extinguishing agent that is relatively lighter than fire extinguishing sand, can be easily placed on the object being extinguished without necessarily using a shovel, that is, can facilitate fire extinguishing operations without having to prepare and use shovels or other tools (excellent fire extinguishing workability). More preferably, there is a need for a new fire extinguishing agent that can be easily removed after extinguishing a fire (has excellent removeability). [Means for solving the problem] 【0009】 As a result of diligent research, the inventors have discovered that foamed glass having a specific specific gravity can be used as a novel fire extinguishing agent to extinguish fires by blocking oxygen. Furthermore, it was discovered that this fire extinguishing agent has a lower specific gravity compared to fire extinguishing sand, and can be easily placed (spread) on the target object without using shovels or other tools (resulting in superior fire extinguishing workability). Furthermore, it was discovered that the fire extinguishing agent can be easily removed after the fire is extinguished (it has excellent removeability). This new fire extinguishing agent is suitable for extinguishing fires in objects that are difficult to extinguish with water, such as oil, solar cells, electric vehicles, and lithium-ion batteries. We also found that there is no risk of electric shock, which led to the completion of the present invention. 【0010】 This specification includes the following embodiments. 1. Specific gravity is 0.3 g / cm³ 3 More than 1.2g / cm 3 The following are fire extinguishing agents containing foamed glass. 2. The fire extinguishing agent described in item 1 above, comprising granular foamed glass having a particle size greater than 0.106 mm and 3.35 mm or less. 3. A fire extinguishing agent according to 1 or 2 above, comprising foamed glass containing SiO2 in an amount of 5.0% to 80.0% by mass, Na2O in an amount of 5.0% to 20.0% by mass, and CaO in an amount of 7.0% to 28.0% by mass. 4. A fire extinguishing agent described in any one of items 1 to 3 above, which is used to extinguish a fire by being placed on top of the object to be extinguished. 5. A fire extinguishing agent according to any one of 1 to 4 above for extinguishing a fire from oil, electric vehicles, lithium-ion batteries or solar cells. 6. A fire extinguishing method including using the fire extinguishing agent according to any one of 1 to 5 above. 7. The fire extinguishing method according to 6 above, including placing the fire extinguishing agent on the object to be extinguished. 8. The fire extinguishing method according to 6 above, including placing a bag containing the fire extinguishing agent on the object to be extinguished. 【Advantages of the Invention】 【0011】 The specific gravity of the embodiment of the present invention is 0.3 g / cm 3 or more and 1.2 g / cm 3 or less. The fire extinguishing agent containing foamed glass can be used as a new fire extinguishing agent. Furthermore, the fire extinguishing agent has a smaller specific gravity than fire sand and can be easily placed (sprayed) on the object to be extinguished without using a scoop or the like. That is, the fire extinguishing operation can be easily performed (excellent fire extinguishing workability), and it can be easily removed after fire extinguishing (excellent removability). The fire extinguishing agent can be preferably used for extinguishing objects to be extinguished that are difficult to extinguish with water, such as oil, solar cells, electric vehicles, lithium-ion batteries, etc., and there is no risk of electric shock. 【Brief Description of the Drawings】 【0012】 [Figure 1] FIG. 1 schematically shows a mineral oil combustion and fire extinguishing test apparatus. [Figure 2] FIG. 2 shows images of the combustion and fire extinguishing of mineral oil. 【Embodiments for Carrying Out the Invention】 【0013】 In one aspect, the present invention provides a fire extinguishing agent containing foamed glass having a specific gravity of 0.3 g / cm 3 or more and 1.2 g / cm 3 or less. In an embodiment of the present invention, the foamed glass refers to a glass having a large number of pores. Since the foamed glass has a large number of pores, it has the characteristic of being light in specific gravity, and has the characteristic that its specific gravity is controllable. 【0014】 The specific gravity of the foamed glass is 0.3 g / cm 3 or more and 1.2 g / cm 3 or less, preferably 0.4 g / cm 3 or more and 1.2 g / cm 3 or less, more preferably 0.5 g / cm 3 or more and 1.1 g / cm 3 or less, still more preferably 0.6 g / cm 3 or more and 1.1 g / cm 3 or less, even more preferably 0.7 g / cm 3 or more and 1.0 g / cm 3 or less, particularly preferably. When the specific gravity of the foamed glass is 0.3 g / cm 3 or more and 1.2 g / cm 3 or less, the fire extinguishing agent of the embodiment of the present invention has a relatively small specific gravity and is easy to handle, and can be easily placed (sprayed) on the fire extinguishing object without using a scoop or the like (excellent fire extinguishing workability), and can be easily removed after fire extinguishing (excellent removability), and can be effectively used to extinguish the fire on the fire extinguishing object where it is difficult to use water without the risk of electric shock. In addition, the specific gravity of the foamed glass can be measured according to the method described in JIS Z 8807 (Method for Measuring the Density and Specific Gravity of Solids). 【0015】 The foamed glass can be produced, for example, by firing a mixture of crushed glass and a foaming agent. The production method of the foamed glass will be described in detail. First, the glass to be used as the raw material for foamed glass (hereinafter referred to as "raw material glass") is crushed. The type of raw material glass is not particularly limited as long as the fire extinguishing agent of the embodiment of the present invention can be obtained, but examples include soda-lime glass, borosilicate glass, and aluminosilicate glass. Waste glass derived from beverage bottles, building glass, automobile glass, solar panel glass, etc., may be used as the raw material glass. The method of crushing the raw material glass is not particularly limited, and it can be crushed using a commercially available vibrating mill or the like. The particle size of the crushed glass (hereinafter referred to as "crushed glass") is not particularly limited, but it is preferable that it be small so that the crushed glass and the foaming agent described later are uniformly mixed. In one example, it is preferable to perform particle size sorting using a sieve with an opening of 500 μm or less after crushing the raw material glass so that the particle size of the crushed glass is 500 μm or less. In this specification, "particle size is X μm (or X mm) or less" means that the particles pass through a sieve with a mesh opening of X μm (or X mm). 【0016】 Next, the crushed glass and the foaming agent are mixed. The type of foaming agent is not particularly limited as long as the fire extinguishing agent of the embodiment of the present invention can be obtained, but for example, SiC, SiN, CaCO3, and materials containing CaCO3 (e.g., seashells) can be used. Such foaming agents generate gas at the temperature at which the glass softens, so as a result, a large number of pores are formed inside the glass, and foamed glass is produced. The content of the foaming agent is not particularly limited, but it is preferably 0.1% by mass or more and 5% by mass or less, and particularly preferably 0.2% by mass or more and 2.0% by mass or less. When the content is as described above, foaming occurs more sufficiently, so foamed glass with improved strength can be obtained, which is preferable. The foaming agent preferably contains calcium carbonate (preferably as the main component). The foaming agent preferably contains seashells (preferably as the main component). 【0017】 Next, the mixture of crushed glass and foaming agent is fired. As long as the fire extinguishing agent of the embodiment of the present invention is obtained, the firing temperature and firing time are not particularly limited and can be set appropriately according to the type of glass and foaming agent so that the glass foams properly. In one example, the firing temperature is 600°C to 1150°C. More specifically, it is 700°C to 1100°C. For soda-lime glass, the firing temperature is preferably 800°C to 1000°C. At such firing temperatures, the glass softens more sufficiently, pores are formed more appropriately, and a more preferable foamed glass can be produced. In one example, the firing time is 1 minute to 60 minutes, in another example, 3 minutes to 25 minutes, and preferably 5 minutes to 20 minutes. At such firing times, foaming occurs more sufficiently, and a more preferable foamed glass can be produced. 【0018】 The manufactured foamed glass can be used as is, or it can be processed into various forms. The foamed glass may be in the form of a block, a flat sheet, or granules. For example, if it is in the form of a flat sheet, it can be placed on the object to be extinguished as is. The foamed glass can also be crushed before use. 【0019】 The particle size of the crushed foamed glass is not particularly limited as long as it can be used as a fire extinguishing agent containing foamed glass, but for example it is 3.35 mm or less, for example 2.8 mm or less, for example 2.36 mm or less, for example 2.0 mm or less, for example 1.7 mm or less, for example 1.4 mm or less. Also, for example it is greater than 0.106 mm, for example greater than 0.150 mm, for example greater than 0.212 mm, for example greater than 0.250 mm, for example greater than 0.300 mm. 【0020】 The particle size of the foamed glass is preferably greater than 0.106 mm and 3.35 mm or less, more preferably greater than 0.150 mm and 2.8 mm or less, even more preferably greater than 0.212 mm and 2.36 mm or less, even more preferably greater than 0.25 mm and 2.0 mm or less, and particularly preferably greater than 0.3 mm and 1.7 mm or less. When the particle size of the foamed glass is greater than 0.106 mm and 3.35 mm or less, the fire extinguishing agent of the embodiment of the present invention can extinguish fires in a shorter time (superior fire extinguishing performance), allows for easier fire extinguishing work (superior fire extinguishing workability), can be easily removed with a vacuum cleaner after extinguishing (superior removeability), and has a superior balance of fire extinguishing performance, fire extinguishing workability, and removeability. 【0021】 Foamed glass is, Preferably, it contains 55.0% to 80.0% by mass of SiO2, 5.0% to 20.0% by mass of Na2O, and 7.0% to 28.0% by mass of CaO. It is more preferable to contain 60.0% to 77.0% by mass of SiO2, 7.0% to 17.5% by mass of Na2O, and 10.0% to 25.0% by mass of CaO. It is even more preferable to contain 63.0% to 74.0% by mass of SiO2, 8.0% to 15.0% by mass of Na2O, and 13.0% to 22.0% by mass of CaO. It is particularly preferable that the mixture contains 66.0% to 70.0% by mass of SiO2, 9.0% to 12.0% by mass of Na2O, and 16.0% to 19.0% by mass of CaO. When the foamed glass contains 55.0% to 80.0% by mass of SiO2, 6.0% to 20.0% by mass of Na2O, and 7.0% to 28.0% by mass of CaO, the fire extinguishing agent of the embodiment of the present invention can maintain fire extinguishing performance more appropriately while more appropriately maintaining the basic properties of the glass, such as strength. Furthermore, the components of foamed glass can be measured in accordance with the method described in JIS R 3101:1995 (Analysis method for soda-lime glass). 【0022】 The fire extinguishing agent according to the embodiment of the present invention can be used to extinguish a fire by placing (spraying) it on the object to be extinguished. 【0023】 The fire extinguishing agent of the embodiment of the present invention can be used for various types of fires, but it can be used to extinguish fires originating from objects that are difficult to extinguish with water (for example, oil, electric vehicles, lithium-ion batteries, or solar cells). 【0024】 In other parts of this invention, the present invention provides a method for extinguishing a fire using a fire extinguishing agent according to embodiments of the present invention. Such fire extinguishing methods are not particularly limited as long as the fire extinguishing agent of the embodiment of the present invention can be used. For example, a fire extinguishing method and fire extinguishing device that uses fire extinguishing sand, or more specifically, a fire extinguishing method and fire extinguishing device that uses the fire extinguishing agent of the embodiment of the present invention instead of fire extinguishing sand, can be provided. Furthermore, for example, a fire extinguishing method can be exemplified that includes placing (spraying) the fire extinguishing agent of the embodiment of the present invention on the object to be extinguished. Furthermore, as an embodiment of the present invention, a fire extinguishing method can be provided that includes placing a bag containing a fire extinguishing agent on top of the object to be extinguished. [Examples] 【0025】 The present invention will be described in detail below with reference to examples and comparative examples, but these examples represent only one aspect of the present invention, and the present invention is not limited in any way by these examples. 【0026】 In this experiment, the following fire extinguishing agents were used. Foamed glass 1, specific gravity: 0.98 g / cm³ 3(Particle size: greater than 0.30 mm and less than or equal to 0.85 mm; composition: 67% by mass of SiO2, 13% by mass of Na2O, 11% by mass of CaO, etc.) Foamed glass 2, specific gravity: 1.05 g / cm³ 3 (Particle size: greater than 0.30 mm and less than or equal to 2.36 mm; composition: 67% by mass of SiO2, 13% by mass of Na2O, 11% by mass of CaO, etc.) Foamed glass 3, specific gravity: 0.41 g / cm³ 3 (Particle size: greater than 3.35 mm and less than or equal to 10.0 mm; composition: 73.5% by mass of SiO2, 10.5% by mass of Na2O, 12.1% by mass of CaO, etc.) Dry sand 1 (Tokai Gravel Co., Ltd.'s river sand (product name), specific gravity: approx. 2.0 g / cm³) 3 (Particle size: greater than 0.2 mm and less than or equal to 3 mm; composition: 97% by mass of SiO2, 0.8% by mass of Al2O3, 0.4% by mass of Fe2O3, etc.) Perlite 1 (Perlite from Togawa Heiwa Farm Co., Ltd. (product name), specific gravity: 0.1 g / cm³) 3 (Particle size: greater than 1.5 mm and less than or equal to 5.0 mm; composition: 75% by mass of SiO2, 15% by mass of Al2O3, 5.3% by mass of Na2O, 4.2% by mass of K2O, etc.) 【0027】 Manufacturing of foamed glass The manufacturing of foamed glass 1-3 was carried out specifically as follows: This section describes foamed glass 1. First, soda-lime glass is prepared so that the particle size is 0.5 mm or less. The material was crushed to the desired consistency. 1.2% by mass of the foaming agent CaCO3 was added and thoroughly mixed. The mixture was fired at 900°C for 8 minutes to obtain foamed glass. This foamed glass was crushed to a particle size of 1 mm or less, and the portion with a particle size greater than 0.3 mm and less than or equal to 0.85 mm was collected by sieving to obtain foamed glass 1. 【0028】 Foamed glass 2 was manufactured using the same method as for manufacturing foamed glass 1, except that the foamed glass was crushed to a particle size of 4 mm or less, and the portion larger than 0.30 mm and smaller than 2.36 mm was collected by sieving. Foamed glass 3 was manufactured using the same method as for manufacturing foamed glass 1, except that SiC was used as a foaming agent, and the foamed glass was crushed to a particle size of 12 mm or less, with the portion larger than 3.35 mm and smaller than 10.0 mm being collected by sieving. 【0029】 Fire extinguishing performance of fire extinguishing agents Figure 1 schematically shows a mineral oil combustion and fire extinguishing test apparatus. A frying pan (bottom diameter 22 cm, depth 6 cm) was fitted with five K-type thermocouples (wire diameter 0.5 mm, measurable temperature: -100 to 1200°C) arranged in a cross shape around the center. The frying pan was placed on a portable gas stove, and a CCD video camera (image quality: XP mode, 30 fps) was attached to create the mineral oil combustion and fire extinguishing test apparatus. 【0030】 200 mL of mineral oil 1 (Sunco MARVIC (product name), manufactured by Nippon Sun Oil Co., Ltd., Class 4 petroleum, flash point 200°C to less than 250°C) and a core material were placed in the frying pan. Mineral oil 1 was heated on a portable gas stove to raise its temperature to 200°C. Fifteen minutes after ignition of mineral oil 1, the following firefighting actions were taken. Specifically, after confirming that the temperature had stabilized at approximately 450°C, the extinguishing agent was added from directly above the mineral oil to cover its entire surface. When it was visually confirmed that the surface of the burning mineral oil 1 was completely covered with the extinguishing agent, the addition of the extinguishing agent was stopped, and the firefighting action was completed. The firefighting action was carried out between 15 and 17 minutes after ignition of mineral oil 1. 【0031】 The temperature of mineral oil 1 15 minutes after ignition and the time from ignition until the temperature dropped to 100°C after extinguishing were started were recorded. The results for foamed glass (1), fire extinguishing sand (1), and perlite (1) are shown in Table 1. In oil fires, steam explosion due to contact with water is considered the most dangerous phenomenon, so it was determined that the fire was extinguished when the temperature dropped below 100°C, the boiling point of water at atmospheric pressure. Furthermore, a CCD video camera was used to record footage of the burning and extinguishing of the mineral oil. The footage for foamed glass 1, fire extinguishing sand 1, and perlite 1 is shown in Figure 2. 【0032】 [Table 1] 【0033】 Furthermore, fire extinguishing tests were also conducted on foamed glass 2 and 3, and the fire extinguishing performance (speed of extinguishing), ease of fire extinguishing activities (workability of fire extinguishing), and ease of removal after extinguishing (removability of fire extinguishing agent) of the extinguishing agents for foamed glass 1-3, dry sand 1, and perlite 1 were evaluated. 【0034】 Fire extinguishing performance of fire extinguishing agents (speed of extinguishing) The fire extinguishing performance of the aforementioned fire extinguishing agents was evaluated according to the following evaluation criteria. The time it took for the temperature of mineral oil 1 to drop below 100°C from ignition, when using each fire extinguishing agent, was classified into 1 minute 30 second intervals, based on the time observed using dry sand 1. If longer than 26 minutes and 53 seconds: × (Not allowed) If the time is longer than 23 minutes and 53 seconds, and 26 minutes and 53 seconds or shorter: △ (acceptable) If the time is longer than 22 minutes and 23 seconds, and between 23 minutes and 53 seconds and shorter: ○ (Good) If the time is 22 minutes and 23 seconds or shorter: It is likely to stray from the object being burned: ◎ (Excellent) 【0035】 Fire extinguishing agent's fire extinguishing performance The fire extinguishing efficiency of the aforementioned fire extinguishing agents was evaluated according to the following evaluation criteria. The fire extinguishing agent can be easily transported to the fire scene and sprayed onto the object being extinguished: ○ (Good) The fire extinguishing agent can be easily moved to the fire scene and sprayed on the object being extinguished, but the agent is prone to straying from the object being extinguished: △ (Acceptable) It is not always easy to transport fire extinguishing agents to the fire scene, and spraying them is not always easy: × (Not possible) 【0036】 Removability of fire extinguishing agents After using the fire extinguishing agent described above, its ease of removal (removability) was evaluated according to the following criteria. The fire extinguishing agent can be removed in 1-2 passes using a household vacuum cleaner: ◎ (Excellent) The fire extinguishing agent can be removed using a household vacuum cleaner in 3 to 5 passes: ○ (Good) The fire extinguishing agent can be easily swept away using a broom: △ (acceptable) Neither a household vacuum cleaner nor a broom can easily remove the fire extinguishing agent: × (Not possible) 【0037】 The results for foamed glass 1-3, fire extinguishing sand 1, and perlite 1 are shown in Table 2. [Table 2] 【0038】 All of the fire extinguishing agents—dry sand (1), perlite (1), and foamed glass (1-3)—were able to extinguish the burning mineral oil. With all of the fire extinguishing agents—dry sand (1), perlite (1), and foamed glass (1-3)—no abnormal combustion occurred during firefighting, such as explosions of burning mineral oil. They admitted that using water instead of fire extinguishing agent caused a sudden explosion, resulting in flames rising to a considerable height, hot mineral oil splattering, and creating a dangerous situation. 【0039】 Regarding fire extinguishing performance (speed of extinguishing) The time required to extinguish the fire with foamed glass 1-2, 3, perlite 1, and dry sand 1 was shortest in that order. The time required to extinguish the fire in foamed glass 2 was approximately the same as the time required to extinguish the fire in foamed glass 1, while the time required to extinguish the fire in foamed glass 3 was longer than the time required to extinguish the fire in foamed glass 2. The time required to extinguish the fires using foamed glass 1-3 was shorter in all cases than the time required to extinguish the fires using perlite 1 and dry sand 1. 【0040】 Regarding fire extinguishing efficiency Foamed glass 1-3 could be easily moved to the firefighting site and easily applied to completely cover the object being extinguished. Dry sand 1 felt heavy when moved to the firefighting site and was not always easy to move. Dry sand 1 also felt heavy when added from above the object being extinguished, making it difficult to add large quantities from above the object being extinguished. Perlite 1 could be easily moved to the fire scene and easily applied to the object being extinguished. However, due to the presence of air currents, the extinguishing agent could sometimes detach from the object being extinguished, requiring care to prevent it from missing the target. 【0041】 Regarding ease of removal Foamed glass 1-3 could all be easily removed with a household vacuum cleaner. In particular, foamed glass 1-2 could be removed with just one contact of the vacuum cleaner nozzle. Foamed glass 3 could be removed with 3-4 contacts of the vacuum cleaner nozzle. Dry sand 1 could not be easily removed with either a household vacuum cleaner or a broom. When trying to remove Perlite 1 with a household vacuum cleaner, it was sometimes difficult to suck it up due to the airflow. It could be removed with a broom. 【0042】 Foamed glass types 1-3 excel in fire extinguishing speed, ease of extinguishing, and removal, and offer superior overall performance. Foamed glass types 1-2, in particular, excel in fire extinguishing speed and removal, and offer exceptionally superior overall performance. Dry sand 1 has poor firefighting and removal properties, and its overall properties are insufficient. Perlite 1 does not necessarily offer sufficient overall performance in terms of fire extinguishing and removal compared to foamed glass 1-3. [Industrial applicability] 【0043】 The specific gravity of the embodiment of the present invention is 0.3 g / cm³. 3 More than 1.2g / cm 3The following fire extinguishing agent containing foamed glass can be used as a new fire extinguishing agent. Furthermore, this fire extinguishing agent has a lower specific gravity than fire extinguishing sand, and can be easily placed (spread) on the object being extinguished without the use of shovels, etc., resulting in excellent fire extinguishing workability. In addition, this fire extinguishing agent can be easily removed after the fire is extinguished (excellent removeability). This fire extinguishing agent can be suitably used to extinguish fires in objects that are difficult to extinguish with water, such as oil, solar cells, electric vehicles, and lithium-ion batteries, and there is no risk of electric shock.

Claims

[Claim 1] Specific gravity is 0.3 g / cm³ ３ 1.2g / cm or more ３ The following are fire extinguishing agents containing foamed glass. [Claim 2] The fire extinguishing agent according to claim 1, comprising granular foamed glass having a particle size greater than 0.106 mm and less than or equal to 3.35 mm. [Claim 3] 55.0% by mass or more and 80.0% by mass or less of SiO ２ , 5.0% by mass or more and 20.0% by mass or less Na ２ The fire extinguishing agent according to claim 1, comprising foamed glass containing 7.0% by mass or more and 28.0% by mass or less of CaO. [Claim 4] A fire extinguishing agent according to claim 1, which is used to extinguish a fire by being placed on top of an object to be extinguished. [Claim 5] The fire extinguishing agent according to claim 1, for extinguishing fires originating from oil, electric vehicles, lithium-ion batteries, or solar cells. [Claim 6] A method of extinguishing a fire using the extinguishing agent described in any one of claims 1 to 5. [Claim 7] The fire extinguishing method according to claim 6, further comprising placing a fire extinguishing agent on top of the object to be extinguished. [Claim 8] The fire extinguishing method according to claim 6, further comprising placing a bag containing a fire extinguishing agent on top of the object to be extinguished.

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