Aluminum silicate gel fire extinguishing agent for lithium battery fire and preparation method of aluminum silicate gel fire extinguishing agent

Abstract

The invention belongs to the technical field of fire extinguishing agent materials, and provides an aluminum silicate gel fire extinguishing agent for lithium battery fire disasters and a preparation method of the aluminum silicate gel fire extinguishing agent. The fire extinguishing agent is composed of a modified aluminum silicate gelling agent, a modified emulsion, a cross-linking agent, an adsorbent, a flame retardant, a foam stabilizer and a foaming agent, a phosphate group is introduced into the aluminum silicate gelling agent, so that the aluminum silicate gelling agent has better free radical capturing capacity, hydroxyl free radicals and hydrogen free radicals in flames are eliminated, and the flame extinguishing effect is improved. According to the present invention, the modified emulsion is added, such that the good fire extinguishing effect can be provided, the re-combustion phenomenon of the lithium ion battery can be effectively prevented, the long-chain alkyl group and the epoxy group are introduced into the modified emulsion so as to improve the lipophilicity and the hydrophilicity of the emulsion, effectively reduce the surface tension, and improve the wetting effect on the surface of the lithium battery; the fire extinguishing effect is further enhanced, and meanwhile, the activated carbon adsorbent can well adsorb generated harmful gas when the lithium ion battery is on fire.

Description

Technical Field

[0001] The invention belongs to the technical field of fire extinguishing agent materials and relates to an aluminum silicate gel fire extinguishing agent for lithium battery fire and a preparation method thereof. Background Art

[0002] Lithium-ion batteries are widely used in many fields such as smart phones and new energy vehicles due to their high energy density and low self-discharge rate, which brings great convenience, but the fire safety issues brought about by them cannot be ignored. Compared with ordinary fires, lithium-ion battery fires have the characteristics of high combustion temperature, strong thermal radiation, and the production of toxic gases during combustion. Conventional isolation of oxygen or direct use of water cannot completely extinguish lithium battery fires. Traditional dry powder fire extinguishing agents produce a large amount of smoke when extinguishing fires, and do not have the ability to cool down and adsorb toxic gases, and cannot solve the problem of lithium-ion battery re-ignition. Therefore, it is necessary to prepare a lithium-ion battery fire extinguishing agent that can prevent lithium-ion batteries from re-igniting, and has a cooling effect and adsorbs toxic gases. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an aluminum silicate gel fire extinguishing agent for lithium battery fire and a preparation method thereof, aiming to improve the fire extinguishing effect and reduce the risk of re-ignition. The aluminum silicate is modified by potassium dihydrogen phosphate and a phosphate group is introduced to improve its surface modification performance and gelling property. The modified aluminum silicate can effectively capture free radicals in the flame under high temperature conditions and inhibit the re-ignition phenomenon. At the same time, by introducing long-chain alkyl and epoxy groups into the modified emulsion, the hydrophilicity and lipophilicity of the emulsion are enhanced, and the wettability of the emulsion is improved, ensuring that it can more effectively penetrate into the surface of the lithium-ion battery during the fire extinguishing process, thereby meeting the needs of the actual situation.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, the preparation method comprising:

[0006] Step S1, dissolving polyvinyl alcohol in deionized water, heating to a first temperature, and continuously stirring at a first stirring speed until the polyvinyl alcohol is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving potassium dihydrogen phosphate in deionized water to obtain a potassium dihydrogen phosphate solution, adding aluminum silicate powder to the polyvinyl alcohol solution, and continuously stirring at a second stirring speed until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at a second stirring speed, heating to a second temperature, cooling to room temperature after sufficient reaction, washing with deionized water, and vacuum drying at a third temperature to obtain a modified aluminum silicate gelling agent;

[0007] Step S2, mixing polyoxyethylene and ethyl palmitate uniformly in dichloromethane, adding sodium hydroxide, heating to a fourth temperature for reaction, washing and purifying after the reaction is completed to obtain ethyl palmitate connected with polyoxyethylene, then mixing ethyl palmitate connected with polyoxyethylene with hexadecyl bromide, heating to a fourth temperature for reaction, and cooling to room temperature for purification to obtain modified ethyl palmitate;

[0008] Step S3, adding an emulsifier to deionized water, stirring at a second stirring speed until the emulsifier is completely dissolved, and then adding modified ethyl palmitate, and continuously stirring at a third stirring speed to obtain a modified emulsion;

[0009] Step S4, adding a foam stabilizer and a foaming agent into deionized water, and then sequentially adding a modified emulsion, a modified aluminum silicate gelling agent, a cross-linking agent, an adsorbent, and a flame retardant and mixing them evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0010] The role of introducing phosphate groups on the surface of aluminum silicate is as follows: (1) Free radical capture. In a high-temperature flame, a large number of free radicals will be generated when a lithium-ion battery catches fire, such as hydroxyl radicals (·OH) and hydrogen radicals (·H), which promote the combustion process. By introducing phosphate groups on the surface of aluminum silicate, these free radicals can be effectively captured, their concentration can be reduced, and thus combustion can be inhibited. Phosphate groups are nucleophilic and can slow down the combustion rate by reacting with free radicals at high temperatures, thereby enhancing the fire extinguishing effect. (2) Formation of a protective film. When phosphate groups are introduced onto the surface of aluminum silicate, a protective film will be formed on the burning surface, which will protect lithium ions from being burned. The sub-battery contains a large amount of metal ions. Under the high temperature of the flame, the phosphate groups can react chemically with the metal ions in the flame to form metal phosphates. Such a membrane not only has excellent thermal insulation properties, but also can effectively prevent further contact with oxygen, thereby reducing the contact between the flame and the combustibles. These phosphate membranes have strong heat resistance and insulation at high temperatures, which can significantly reduce the heat transfer of the flame, inhibit the spread of flames and have good heat absorption capacity, thereby reducing the temperature of the combustion surface and further slowing down the combustion rate. At the same time, phosphates will release water at high temperatures, and the evaporation of water absorbs heat, reducing the local temperature. After the fire is extinguished, the residual heat may cause the fire to reignite. By introducing the modified aluminum silicate with phosphate groups, a structure with heat absorption capacity can be formed, which plays a key role in the reignition. By reducing the temperature of the combustibles and ensuring that it is below the threshold of reignition, the safety after the fire is extinguished is enhanced; (3) Enhance the hydrophilicity. After the introduction of phosphate groups, the hydrophilicity of aluminum silicate is significantly improved. The phosphate groups can form hydrogen bonds with water molecules, which increases the dispersibility of aluminum silicate in the aqueous phase, enables it to form a uniform suspension in water, reduces its sedimentation rate in water, and ensures that the aluminum silicate is stable in the water. During the fire extinguishing process, the gelling agent can effectively remain in a suspended state and take effect in a timely manner; (4) After the introduction of phosphate groups, more reaction sites are generated on the surface of aluminum silicate. These sites can undergo cross-linking reactions with the cross-linking agent to form a stable three-dimensional network structure, thereby enhancing the stability and strength of the gel. The modified aluminum silicate can better interact with water. This enhanced adhesion ensures that it can effectively adhere to the burning surface during the fire extinguishing process to form a stable isolation layer, thereby improving its gelling effect and wetting properties, and can effectively cover and cool the battery surface, reducing the risk of re-ignition.

[0011] The functions of modified emulsions are: (1) improving wettability. The molecular structure of polyoxyethylene contains multiple hydroxyl groups, which can form strong hydrogen bonds with water molecules. The formation of such hydrogen bonds enhances the hydrophilicity of the emulsion, thereby improving its wetting ability. When extinguishing a fire, it can more effectively infiltrate the burning surface and promote the penetration of the fire extinguishing agent. At the same time, polyoxyethylene, as a surfactant, can reduce the surface tension of the liquid and help the various components in the emulsion to be evenly dispersed. Good dispersibility not only enhances the stability of the emulsion, but also ensures the uniformity and effectiveness of the fire extinguishing agent during use, allowing the fire extinguishing agent to wet and cover the burning surface more quickly; (2) improving the stability of the emulsion. The long-chain alkyl group enhances the stability of the emulsion by interacting with the oily substance. The hydrophobic area formed by the long-chain structure in the emulsion can effectively reduce the possibility of phase separation and maintain the uniformity of the emulsion. The long-chain alkyl interacts with the oily fuel (such as the electrolyte of the lithium battery) through the hydrophobic effect, so that the fire extinguishing agent can better penetrate into the burning object and enhance the fire extinguishing effect. At the same time, during the foam formation process, the long-chain alkyl molecules can form a hydrophobic film on the bubble surface. The existence of this film can effectively prevent the foam from bursting and prolong the retention time of the foam, so that the foam can be suspended above the flame for a longer time, thereby reducing the possibility of re-ignition. By introducing polyoxyethylene groups and long-chain alkyls, the modified emulsion has excellent wettability and foam stability. When extinguishing a fire, this dual property allows the fire extinguishing agent to not only quickly penetrate the burning surface, but also effectively isolate oxygen, forming a lasting foam layer, and improving the overall fire extinguishing performance.

[0012] As a preferred technical solution of the present invention, in step S1, the mass of the polyvinyl alcohol is 3-5g, for example, it can be 3.0g, 3.2g, 3.4g, 3.6g, 3.8g, 4.0g, 4.2g, 4.4g, 4.6g, 4.8g or 5.0g, the degree of alcoholysis is 88.0±1.5mole%, and the viscosity of 4% aqueous solution is 3.3±0.5mPa.s; but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0013] In some optional examples, the volume of deionized water used to dissolve polyvinyl alcohol is 180-200 mL, for example, it can be 180 mL, 182 mL, 184 mL, 186 mL, 188 mL, 190 mL, 192 mL, 194 mL, 196 mL, 198 mL or 200 mL, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] In some optional instances, the first temperature is 80-90°C, for example, it can be 80°C, 81°C, 82°C, 83°C, 84°C, 85°C, 86°C, 87°C, 88°C, 89°C or 90°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] In some optional examples, the first stirring speed is 300-400rpm, for example, it can be 300rpm, 310rpm, 320rpm, 330rpm, 340rpm, 350rpm, 360rpm, 370rpm, 380rpm, 390rpm or 400rpm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] In some optional examples, the mass of the potassium dihydrogen phosphate is 3-5g, for example, it can be 3.0g, 3.2g, 3.4g, 3.6g, 3.8g, 4.0g, 4.2g, 4.4g, 4.6g, 4.8g or 5.0g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0017] In some optional examples, the volume of deionized water used to dissolve potassium dihydrogen phosphate is 50-70 mL, for example, it can be 50 mL, 52 mL, 54 mL, 56 mL, 58 mL, 60 mL, 62 mL, 64 mL, 66 mL, 68 mL or 70 mL, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] In some optional examples, the mass of the aluminum silicate powder is 50-70g, for example, it can be 50g, 52g, 54g, 56g, 58g, 60g, 62g, 64g, 66g, 68g or 70g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] In some optional examples, the second stirring speed is 200-300 rpm, for example, it can be 200 rpm, 210 rpm, 220 rpm, 230 rpm, 240 rpm, 250 rpm, 260 rpm, 270 rpm, 280 rpm, 290 rpm or 300 rpm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] In some optional instances, the second temperature is 60-80°C, for example, it can be 60°C, 62°C, 64°C, 66°C, 68°C, 70°C, 72°C, 74°C, 76°C, 78°C or 80°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] In some optional examples, the reaction time at the second temperature is 2-3h, for example, it can be 2.0h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, 2.6h, 2.7h, 2.8h, 2.9h or 3.0h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] In some optional instances, the third temperature is 50-60°C, for example, it can be 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C or 60°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] In some optional examples, the vacuum drying time is 8-10h, for example, it can be 8.0h, 8.2h, 8.4h, 8.6h, 8.8h, 9.0h, 9.2h, 9.4h, 9.6h, 9.8h or 10.0h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] As a preferred technical solution of the present invention, in step S2, the volume of dichloromethane is 200-230 mL, for example, it can be 200 mL, 203 mL, 206 mL, 209 mL, 212 mL, 215 mL, 218 mL, 221 mL, 224 mL, 227 mL or 230 mL, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] In some optional examples, the mass of the polyoxyethylene is 10-15g, for example, it can be 10.0g, 10.5g, 11.0g, 11.5g, 12.0g, 12.5g, 13.0g, 13.5g, 14.0g, 14.5g or 15.0g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] In some optional examples, the mass of the ethyl palmitate is 50-60g, for example, it can be 50g, 51g, 52g, 53g, 54g, 55g, 56g, 57g, 58g, 59g or 60g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] In some optional examples, the mass of the sodium hydroxide is 0.3-0.5g, for example, it can be 0.30g, 0.32g, 0.34g, 0.36g, 0.38g, 0.40g, 0.42g, 0.44g, 0.46g, 0.48g or 0.50g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] In some optional instances, the fourth temperature is 60-70°C, for example, it can be 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C or 70°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] In some optional examples, the reaction time of adding sodium hydroxide is 2-4h, for example, it can be 2.0h, 2.2h, 2.4h, 2.6h, 2.8h, 3.0h, 3.2h, 3.4h, 3.6h, 3.8h or 4.0h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0030] In some optional examples, the mass of the hexadecyl bromide is 10-15g, for example, it can be 10.0g, 10.5g, 11.0g, 11.5g, 12.0g, 12.5g, 13.0g, 13.5g, 14.0g, 14.5g or 15.0g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] In some optional examples, the reaction time for adding hexadecyl bromide is 2-3h, for example, 2.0h, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, 2.6h, 2.7h, 2.8h, 2.9h or 3.0h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] As a preferred technical solution of the present invention, in step S3, the volume of the deionized water is 100-120 mL, for example, it can be 100 mL, 102 mL, 104 mL, 106 mL, 108 mL, 110 mL, 112 mL, 114 mL, 116 mL, 118 mL or 120 mL, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0033] In some optional examples, the emulsifier is Tween 20 with a mass of 2-3 g, for example, 2.0 g, 2.1 g, 2.2 g, 2.3 g, 2.4 g, 2.5 g, 2.6 g, 2.7 g, 2.8 g, 2.9 g or 3.0 g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0034] In some optional examples, the mass of the modified ethyl palmitate is 30-40g, for example, it can be 30g, 31g, 32g, 33g, 34g, 35g, 36g, 37g, 38g, 39g or 40g, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0035] In some optional examples, the third stirring speed is 800-1000rpm, for example, it can be 800rpm, 820rpm, 840rpm, 860rpm, 880rpm, 900rpm, 920rpm, 940rpm, 960rpm, 980rpm or 1000rpm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] In some optional examples, the stirring time is 20-30 min, for example, it can be 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min or 30 min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0037] As a preferred technical solution of the present invention, in step S4, the foam stabilizer is triethylene glycol monobutyl ether; the foaming agent is sodium α-olefin sulfonate; the cross-linking agent is sodium bicarbonate; the adsorbent is activated carbon; the flame retardant is zinc borate; the mass parts of each component of an aluminum silicate gel fire extinguishing agent for lithium battery fire are: foam stabilizer: 8-10 parts, foaming agent: 1-2 parts, deionized water: 50-70 parts, modified emulsion: 15-25 parts, modified aluminum silicate gelling agent: 5-10 parts, cross-linking agent: 1-3 parts, adsorbent: 2-5 parts, flame retardant: 1-3 parts. The mass parts of the foam stabilizer can be 8.0 parts, 8.2 parts, 8.4 parts, 8.6 parts, 8.8 parts, 9.0 parts, 9.2 parts, 9.4 parts, 9.6 parts, 9.8 parts or 10.0 parts, and the mass parts of the foaming agent can be 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts or 2.0 parts, The mass parts of deionized water can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts or 70 parts, the mass parts of modified latex can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, and the mass parts of modified aluminum silicate gelling agent can be 5.0 parts, 5.5 parts, 6 The weight parts of the cross-linking agent can be 1.0 parts, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2.0 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3.0 parts, and the weight parts of the adsorbent can be 2.0 parts, 2.3 parts, 2.6 parts, 2.8 parts or 3.0 parts. .9 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4.1 parts, 4.4 parts, 4.7 parts or 5.0 parts, the mass parts of flame retardant can be 1.0 parts, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2.0 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3.0 parts, but are not limited to the listed values, and other unlisted values ​​within the numerical range are equally applicable.

[0038] In a second aspect, the present invention provides an aluminum silicate gel fire extinguishing agent for lithium battery fire obtained according to the above preparation method.

[0039] Compared with the prior art, the present invention has the following beneficial effects: (1) the introduction of phosphate groups improves the gelling properties of aluminum silicate, enabling it to quickly form a gel state in a liquid; at the same time, the phosphate groups can react with free radicals in the flame to reduce the heat and intensity of the flame, capture free radicals through chemical reactions, and reduce the re-ignition phenomenon; the phosphate groups can also react chemically with metal ions in the flame to generate a metal phosphate film, which can effectively prevent further contact with oxygen, has strong heat resistance and insulation at high temperatures, can significantly reduce the heat transfer of the flame, and improve the fire extinguishing effect; (2) by introducing polyoxyethylene chains and long-chain alkyl groups, the hydrophilicity and lipophilicity of the modified emulsion are enhanced, so that the emulsion can better wet the surface of the lithium-ion battery and improve the coverage of the fire extinguishing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flow chart of a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires provided in Examples 1-8 of the present invention;

[0041] Figure 2 This is the SEM image of the aluminum silicate gel prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is described in detail below in conjunction with specific embodiments and their accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary and should not be construed as limitations on the embodiments of the present invention and the scope of protection of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims of this application and its specification, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0043] The chemical reagents used in the examples and comparative examples of the present invention are all commercially available products, and their brands, specifications and manufacturer information are as follows:

[0044] Polyvinyl alcohol, purity ≥99%, Tianjin Xindema Group Co., Ltd.;

[0045] Potassium dihydrogen phosphate, purity ≥99%, Hubei Potash Chemical Co., Ltd.;

[0046] Aluminum silicate, purity ≥99%, Jiangsu Pulex Biotechnology Co., Ltd.;

[0047] Dichloromethane, purity ≥99%, Liaocheng Tongda Chemical Co., Ltd.;

[0048] Polyethylene oxide, purity ≥99%, Nantong Yuyuan New Material Technology Co., Ltd.;

[0049] Ethyl palmitate, purity ≥99%, Jiangsu Bosite Chemical Technology Co., Ltd.;

[0050] Sodium hydroxide, purity ≥99%, Shandong Zhongyuan Chemical Co., Ltd.;

[0051] Hexadecyl bromide, purity ≥99%, Yancheng Longsheng Chemical Co., Ltd.;

[0052] Tween 20, purity ≥99%, Hebei Clavier Biotechnology Co., Ltd.;

[0053] Triethylene glycol monobutyl ether, purity ≥99%, Shanghai MacLean Biochemical Technology Co., Ltd.;

[0054] Sodium α-olefin sulfonate, purity ≥99%, Shanghai MacLean Biochemical Technology Co., Ltd.;

[0055] Sodium bicarbonate, purity ≥99%, Xuzhou Songyu Chemical Technology Co., Ltd.;

[0056] Activated carbon, purity ≥98%, Yu Rui (Shanghai) Chemical Co., Ltd.;

[0057] Zinc borate, purity ≥99%, Jiangyin Shell Chemical Co., Ltd.;

[0058] Other raw materials can be purchased from the market.

[0059] Example 1

[0060] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0061] Triethylene glycol monobutyl ether: 8.4 parts;

[0062] Sodium α-olefin sulfonate: 1.5 parts;

[0063] Deionized water: 57 parts;

[0064] Modified emulsion: 18 parts;

[0065] Modified aluminum silicate gelling agent: 7 parts;

[0066] Sodium bicarbonate: 2.6 parts;

[0067] Activated carbon: 4.2 parts;

[0068] Zinc borate: 1.3 parts.

[0069] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0070] Step S1, dissolving 3.6g of polyvinyl alcohol in 182mL of deionized water, heating to 84°C, stirring continuously at 320rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving 4.3g of potassium dihydrogen phosphate in 56mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 57g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 210rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 210rpm, heating to 65°C, fully reacting for 2.2h, then cooling to room temperature, washing with deionized water, and vacuum drying at 53°C for 8.9h to obtain a modified aluminum silicate gelling agent;

[0071] Step S2, 11.6 g of polyoxyethylene and 58 g of ethyl palmitate were mixed evenly in 210 mL of dichloromethane, 0.38 g of sodium hydroxide was added, the temperature was raised to 63° C. for reaction, and the reaction was completed for 2.3 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 12.4 g of hexadecyl bromide, and the mixture was heated to 63° C. for reaction. After the reaction was completed for 2.1 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0072] Step S3, adding 2.4 g of Tween 20 to 107 mL of deionized water, stirring at 230 rpm until completely dissolved, then adding 36 g of modified ethyl palmitate, and continuously stirring at 890 rpm for 24 min to obtain a modified emulsion;

[0073] Step S4, adding 8.4 parts of triethylene glycol monobutyl ether and 1.5 parts of sodium α-olefin sulfonate to 57 parts of deionized water, and then adding 18 parts of modified latex, 7 parts of modified aluminum silicate gelling agent, 2.6 parts of sodium bicarbonate, 4.2 parts of activated carbon, and 1.3 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0074] Figure 2 This is the SEM image of the aluminum silicate gel prepared in this example.

[0075] Example 2

[0076] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0077] Triethylene glycol monobutyl ether: 9.1 parts;

[0078] Sodium α-olefin sulfonate: 1.4 parts;

[0079] Deionized water: 59.5 parts;

[0080] Modified emulsion: 18.4 parts;

[0081] Modified aluminum silicate gelling agent: 5.6 parts;

[0082] Sodium bicarbonate: 1.4 parts;

[0083] Activated carbon: 2.7 parts;

[0084] Zinc borate: 1.9 parts.

[0085] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0086] Step S1, dissolving 3.9g of polyvinyl alcohol in 187mL of deionized water, heating to 82°C, stirring continuously at 310rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform solution, then dissolving 3.8g of potassium dihydrogen phosphate in 59mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 54g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 230rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 230rpm, heating to 69°C, fully reacting for 2.4h, then cooling to room temperature, washing with deionized water, and vacuum drying at 55°C for 8.4h to obtain a modified aluminum silicate gelling agent;

[0087] Step S2, 11.9 g of polyoxyethylene and 54 g of ethyl palmitate were uniformly mixed in 215 mL of dichloromethane, 0.33 g of sodium hydroxide was added, the temperature was raised to 65° C. for reaction, and the reaction was completed for 2.7 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 11.8 g of hexadecyl bromide, and the mixture was heated to 64° C. for reaction. After the reaction was completed for 2.3 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0088] Step S3, adding 2.2 g of Tween 20 to 112 mL of deionized water, stirring at 220 rpm until completely dissolved, then adding 34 g of modified ethyl palmitate, and continuously stirring at 920 rpm for 21 min to obtain a modified emulsion;

[0089] Step S4, adding 9.1 parts of triethylene glycol monobutyl ether and 1.4 parts of sodium α-olefin sulfonate to 59.5 parts of deionized water, and then adding 18.4 parts of modified latex, 5.6 parts of modified aluminum silicate gelling agent, 1.4 parts of sodium bicarbonate, 2.7 parts of activated carbon, and 1.9 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0090] Example 3

[0091] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0092] Triethylene glycol monobutyl ether: 8.4 parts;

[0093] Sodium α-olefin sulfonate: 1.6 parts;

[0094] Deionized water: 58 parts;

[0095] Modified emulsion: 19.4 parts;

[0096] Modified aluminum silicate gelling agent: 5.7 parts;

[0097] Sodium bicarbonate: 2.5 parts;

[0098] Activated carbon: 2.9 parts;

[0099] Zinc borate: 1.5 parts.

[0100] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0101] Step S1, dissolving 4.3g of polyvinyl alcohol in 191mL of deionized water, heating to 86°C, stirring continuously at 340rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform solution, then dissolving 3.3g of potassium dihydrogen phosphate in 64mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 58g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 260rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 260rpm, heating to 73°C, fully reacting for 2.7h, then cooling to room temperature, washing with deionized water, and vacuum drying at 57°C for 8.8h to obtain a modified aluminum silicate gelling agent;

[0102] Step S2, 12.7 g of polyoxyethylene and 57 g of ethyl palmitate were uniformly mixed in 220 mL of dichloromethane, 0.38 g of sodium hydroxide was added, the temperature was raised to 67° C. for reaction, and the reaction was completed for 2.9 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 12.4 g of hexadecyl bromide, and the mixture was heated to 65° C. for reaction. After the reaction was completed for 2.6 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0103] Step S3, adding 2.6 g of Tween 20 to 110 mL of deionized water, stirring at 240 rpm until completely dissolved, then adding 37 g of modified ethyl palmitate, and continuously stirring at 950 rpm for 25 min to obtain a modified emulsion;

[0104] Step S4, adding 8.4 parts of triethylene glycol monobutyl ether and 1.6 parts of sodium α-olefin sulfonate to 58 parts of deionized water, and then adding 19.4 parts of modified latex, 5.7 parts of modified aluminum silicate gelling agent, 2.5 parts of sodium bicarbonate, 2.9 parts of activated carbon, and 1.5 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0105] Example 4

[0106] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0107] Triethylene glycol monobutyl ether: 9.6 parts;

[0108] Sodium α-olefin sulfonate: 1.3 parts;

[0109] Deionized water: 54.2 parts;

[0110] Modified emulsion: 19.4 parts;

[0111] Modified aluminum silicate gelling agent: 7.1 parts;

[0112] Sodium bicarbonate: 2.4 parts;

[0113] Activated carbon: 4.8 parts;

[0114] Zinc borate: 2.2 parts.

[0115] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0116] Step S1, dissolving 4.1g of polyvinyl alcohol in 190mL of deionized water, heating to 88°C, stirring continuously at 360rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving 3.0g of potassium dihydrogen phosphate in 62mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 61g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 250rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 250rpm, heating to 77°C, fully reacting for 2.6h, then cooling to room temperature, washing with deionized water, and vacuum drying at 55°C for 8.9h to obtain a modified aluminum silicate gelling agent;

[0117] Step S2, 12.2 g of polyoxyethylene and 51 g of ethyl palmitate were mixed evenly in 221 mL of dichloromethane, 0.43 g of sodium hydroxide was added, the temperature was raised to 62° C. for reaction, and the reaction was completed for 3.2 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 12.8 g of hexadecyl bromide, and the mixture was heated to 64° C. for reaction. After the reaction was completed for 2.3 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0118] Step S3, adding 2.2 g of Tween 20 to 106 mL of deionized water, stirring at 250 rpm until completely dissolved, then adding 33 g of modified ethyl palmitate, and continuously stirring at 970 rpm for 24 min to obtain a modified emulsion;

[0119] Step S4, adding 9.6 parts of triethylene glycol monobutyl ether and 1.3 parts of sodium α-olefin sulfonate to 54.2 parts of deionized water, and then adding 19.4 parts of modified latex, 7.1 parts of modified aluminum silicate gelling agent, 2.4 parts of sodium bicarbonate, 4.8 parts of activated carbon, and 2.2 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0120] Example 5

[0121] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0122] Triethylene glycol monobutyl ether: 8.7 parts;

[0123] Sodium α-olefin sulfonate: 1.7 parts;

[0124] Deionized water: 54.1 parts;

[0125] Modified emulsion: 20.9 parts;

[0126] Modified aluminum silicate gelling agent: 7.7 parts;

[0127] Sodium bicarbonate: 1.8 parts;

[0128] Activated carbon: 3.8 parts;

[0129] Zinc borate: 1.3 parts.

[0130] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0131] Step S1, dissolving 4.6g of polyvinyl alcohol in 200mL of deionized water, heating to 89°C, stirring continuously at 380rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform solution, then dissolving 4.4g of potassium dihydrogen phosphate in 65mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 64g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 240rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 240rpm, heating to 73°C, fully reacting for 2.8h, then cooling to room temperature, washing with deionized water, and vacuum drying at 53°C for 9.4h to obtain a modified aluminum silicate gelling agent;

[0132] Step S2, 13.7 g of polyoxyethylene and 58 g of ethyl palmitate were uniformly mixed in 219 mL of dichloromethane, 0.46 g of sodium hydroxide was added, the temperature was raised to 67° C. for reaction, and the reaction was completed for 3.6 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 13.1 g of hexadecyl bromide, and the mixture was heated to 67° C. for reaction. After the reaction was completed for 2.6 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0133] Step S3, adding 2.7 g of Tween 20 to 114 mL of deionized water, stirring at 280 rpm until completely dissolved, then adding 38 g of modified ethyl palmitate, and continuously stirring at 900 rpm for 28 min to obtain a modified emulsion;

[0134] Step S4, adding 8.7 parts of triethylene glycol monobutyl ether and 1.7 parts of sodium α-olefin sulfonate to 54.1 parts of deionized water, and then adding 20.9 parts of modified latex, 7.7 parts of modified aluminum silicate gelling agent, 1.8 parts of sodium bicarbonate, 3.8 parts of activated carbon, and 1.3 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0135] Example 6

[0136] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0137] Triethylene glycol monobutyl ether: 8.6 parts;

[0138] Sodium α-olefin sulfonate: 1.4 parts;

[0139] Deionized water: 58.2 parts;

[0140] Modified emulsion: 16.8 parts;

[0141] Modified aluminum silicate gelling agent: 7.9 parts;

[0142] Sodium bicarbonate: 2.1 parts;

[0143] Activated carbon: 3.1 parts;

[0144] Zinc borate: 1.9 parts.

[0145] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0146] Step S1, dissolving 4.1g of polyvinyl alcohol in 190mL of deionized water, heating to 85°C, stirring continuously at 330rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving 3.1g of potassium dihydrogen phosphate in 61mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 57g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 260rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 260rpm, heating to 76°C, fully reacting for 2.4h, then cooling to room temperature, washing with deionized water, and vacuum drying at 55°C for 9.1h to obtain a modified aluminum silicate gelling agent;

[0147] Step S2, 14.2 g of polyoxyethylene and 52 g of ethyl palmitate were mixed evenly in 224 mL of dichloromethane, 0.44 g of sodium hydroxide was added, the temperature was raised to 64° C. for reaction, and the reaction was completed for 3.2 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 13.9 g of hexadecyl bromide, and the mixture was heated to 65° C. for reaction. After the reaction was completed for 2.7 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0148] Step S3, adding 2.4 g of Tween 20 to 117 mL of deionized water, stirring at 250 rpm until completely dissolved, then adding 34 g of modified ethyl palmitate, and continuously stirring at 880 rpm for 25 min to obtain a modified emulsion;

[0149] Step S4, adding 8.6 parts of triethylene glycol monobutyl ether and 1.4 parts of sodium α-olefin sulfonate to 58.2 parts of deionized water, and then adding 16.8 parts of modified latex, 7.9 parts of modified aluminum silicate gelling agent, 2.1 parts of sodium bicarbonate, 3.1 parts of activated carbon, and 1.9 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0150] Example 7

[0151] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0152] Triethylene glycol monobutyl ether: 9.8 parts;

[0153] Sodium α-olefin sulfonate: 1.3 parts;

[0154] Deionized water: 52.4 parts;

[0155] Modified emulsion: 19.9 parts;

[0156] Modified aluminum silicate gelling agent: 6.8 parts;

[0157] Sodium bicarbonate: 2.8 parts;

[0158] Activated carbon: 4.4 parts;

[0159] Zinc borate: 2.6 parts.

[0160] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0161] Step S1, dissolving 3.7g of polyvinyl alcohol in 184mL of deionized water, heating to 88°C, stirring continuously at 370rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving 4.5g of potassium dihydrogen phosphate in 63mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 59g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 220rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 220rpm, heating to 73°C, fully reacting for 2.6h, then cooling to room temperature, washing with deionized water, and vacuum drying at 53°C for 8.6h to obtain a modified aluminum silicate gelling agent;

[0162] Step S2, 12.7 g of polyoxyethylene and 51 g of ethyl palmitate were mixed evenly in 208 mL of dichloromethane, 0.36 g of sodium hydroxide was added, the temperature was raised to 61° C. for reaction, and the reaction was completed for 2.8 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 11.7 g of hexadecyl bromide, and the mixture was heated to 66° C. for reaction. After the reaction was completed for 2.3 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0163] Step S3, adding 2.2 g of Tween 20 to 107 mL of deionized water, stirring at 280 rpm until completely dissolved, then adding 32 g of modified ethyl palmitate, and continuously stirring at 930 rpm for 27 min to obtain a modified emulsion;

[0164] Step S4, adding 9.8 parts of triethylene glycol monobutyl ether and 1.3 parts of sodium α-olefin sulfonate to 52.4 parts of deionized water, and then adding 19.9 parts of modified latex, 6.8 parts of modified aluminum silicate gelling agent, 2.8 parts of sodium bicarbonate, 4.4 parts of activated carbon, and 2.6 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0165] Example 8

[0166] This embodiment provides a method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fires, wherein the aluminum silicate gel fire extinguishing agent for lithium battery fires comprises the following components in parts by weight:

[0167] Triethylene glycol monobutyl ether: 8.5 parts;

[0168] Sodium α-olefin sulfonate: 1.2 parts;

[0169] Deionized water: 54.6 parts;

[0170] Modified emulsion: 17.2 parts;

[0171] Modified aluminum silicate gelling agent: 9.7 parts;

[0172] Sodium bicarbonate: 2.0 parts;

[0173] Activated carbon: 4.2 parts;

[0174] Zinc borate: 2.6 parts.

[0175] like Figure 1 As shown, the preparation method specifically comprises the following steps:

[0176] Step S1, dissolving 3.7g of polyvinyl alcohol in 184mL of deionized water, heating to 88°C, stirring continuously at 370rpm until the polyvinyl alcohol solution is completely dissolved to form a uniform solution, then dissolving 3.5g of potassium dihydrogen phosphate in 63mL of deionized water to obtain a potassium dihydrogen phosphate solution, adding 59g of aluminum silicate powder to the polyvinyl alcohol solution, stirring continuously at 220rpm until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring at 220rpm, heating to 73°C, fully reacting for 2.6h, then cooling to room temperature, washing with deionized water, and vacuum drying at 53°C for 8.6h to obtain a modified aluminum silicate gelling agent;

[0177] Step S2, 12.7 g of polyoxyethylene and 51 g of ethyl palmitate were mixed evenly in 208 mL of dichloromethane, 0.36 g of sodium hydroxide was added, the temperature was raised to 61° C. for reaction, and the reaction was completed for 2.8 h, followed by washing and purification to obtain ethyl palmitate connected to polyoxyethylene, and then the ethyl palmitate connected to polyoxyethylene was mixed with 11.7 g of hexadecyl bromide, and the mixture was heated to 66° C. for reaction. After the reaction was completed for 2.3 h, the mixture was cooled to room temperature and purified to obtain modified ethyl palmitate;

[0178] Step S3, adding 2.2 g of Tween 20 to 107 mL of deionized water, stirring at 280 rpm until completely dissolved, then adding 32 g of modified ethyl palmitate, and continuously stirring at 930 rpm for 27 min to obtain a modified emulsion;

[0179] Step S4, adding 8.5 parts of triethylene glycol monobutyl ether and 1.2 parts of sodium α-olefin sulfonate to 54.6 parts of deionized water, and then adding 17.2 parts of modified latex, 9.7 parts of modified aluminum silicate gelling agent, 2.0 parts of sodium bicarbonate, 4.2 parts of activated carbon, and 2.6 parts of zinc borate in sequence, and mixing evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

[0180] Comparative Example 1

[0181] This comparative example provides an aluminum silicate gel fire extinguishing agent for lithium battery fires. The difference between it and Example 1 is that the mass of potassium dihydrogen phosphate is adjusted to 7.3 g. Compared with Example 1, the mass of potassium dihydrogen phosphate is increased by 3 g. The other process parameters and operating conditions are exactly the same as those in Example 1.

[0182] Comparative Example 2

[0183] This comparative example provides an aluminum silicate gel fire extinguishing agent for lithium battery fires. The difference between it and Example 1 is that the mass of potassium dihydrogen phosphate is adjusted to 1.3 g. Compared with Example 1, the mass of potassium dihydrogen phosphate is reduced by 3 g. The other process parameters and operating conditions are exactly the same as those in Example 1.

[0184] Comparative Example 3

[0185] This comparative example provides an aluminum silicate gel fire extinguishing agent for lithium battery fires. The difference between it and Example 1 is that the mass of hexadecyl bromide is adjusted to 17.4 g. Compared with Example 1, the mass of hexadecyl bromide is increased by 5 g. The other process parameters and operating conditions are exactly the same as those in Example 1.

[0186] Comparative Example 4

[0187] This comparative example provides an aluminum silicate gel fire extinguishing agent for lithium battery fires. The difference between it and Example 1 is that the mass of hexadecyl bromide is adjusted to 7.4 g. Compared with Example 1, the mass of hexadecyl bromide is reduced by 5 g. The other process parameters and operating conditions are exactly the same as those in Example 1.

[0188] The lithium battery used in the lithium battery fire extinguishing performance test is a square aluminum shell ternary lithium ion battery, the positive electrode material is nickel cobalt manganese oxide [Li(NiCoMn)O2], the rated capacity is 150A·h, the battery cell mass is 2700±2.3g, the size of the lithium ion battery cell is 180mm×100mm×60mm, and the charge state of the experimental battery is 100%; the test lithium battery is placed on a heating plate with a power of 600W; the thermocouple is arranged at the center of the side of the lithium battery to monitor the temperature change of the lithium battery during the fire extinguishing process; the foam spreading time is calculated as the time required for 20g of aluminum silicate gel fire extinguishing agent to cover an area of ​​50cm*50cm; the fire extinguishing time is calculated as the time from the first appearance of open flame to the first extinguishing of open flame, and the fire extinguishing time after re-ignition is not included; after the open flame is extinguished, if re-ignition occurs within 20min, the fire extinguishing fails; the temperature range for calculating the cooling rate is from the highest temperature of the lithium battery to 150℃.

[0189] Table 1 Test results of aluminum silicate gel fire extinguishing agent for lithium battery fires in Examples 1-8 and Comparative Examples 1-4

[0190]

[0191]

[0192] From the data of Example 1, Comparative Example 1 and Comparative Example 2, it can be seen that the foam spreading time and fire extinguishing time of Comparative Example 1 are higher than those of Example 1, no re-ignition phenomenon occurs, and the cooling rate is lower than that of Example 1; the foam spreading time of Comparative Example 2 is lower than that of Example 1, the fire extinguishing time is higher than that of Example 1, re-ignition phenomenon occurs, and the cooling rate is lower than that of Example 1. This is because in Comparative Example 1, excessive phosphate groups will cause excessive hydrogen bonds and electrostatic interactions to form on the foam surface, which increases the resistance of the foam when spreading, prolongs the foam spreading time, and increases the fire extinguishing time. In Comparative Example 2, insufficient phosphate groups cannot fully capture free radicals in the flame, and the dispersion of aluminum silicate in the water phase is insufficient, which weakens the fire extinguishing effect and causes re-ignition phenomenon.

[0193] It can be seen from the data of Example 1, Comparative Example 3 and Comparative Example 4 that the foam spreading time and fire extinguishing time of Comparative Example 3 are higher than those of Example 1, no re-ignition phenomenon occurs, and the cooling rate is lower than that of Example 1; the foam spreading time of Comparative Example 4 is lower than that of Example 1, the fire extinguishing time is higher than that of Example 1, re-ignition phenomenon occurs, and the cooling rate is lower than that of Example 1. This is because in Comparative Example 3, the excessive hexadecyl bromide increases the surface tension, increases the foam spreading time, and increases the fire extinguishing time. In Comparative Example 4, the hexadecyl bromide is insufficient, and a hydrophobic film cannot be formed on the foam surface, which reduces the retention time of the foam, reduces the fire extinguishing effect, and re-ignition occurs.

[0194] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire, characterized in that: The preparation method is: Step S1, dissolving polyvinyl alcohol in deionized water, heating to a first temperature, and continuously stirring until the polyvinyl alcohol solution is completely dissolved to form a uniform polyvinyl alcohol solution, then dissolving potassium dihydrogen phosphate in deionized water to obtain a potassium dihydrogen phosphate solution, adding aluminum silicate powder to the polyvinyl alcohol solution, and continuously stirring until the aluminum silicate powder is uniformly dispersed to form a suspension, adding the potassium dihydrogen phosphate solution to the suspension, stirring, heating to a second temperature, cooling to room temperature after sufficient reaction, washing with deionized water, and vacuum drying at a third temperature to obtain a modified aluminum silicate gelling agent; Step S2, mixing polyoxyethylene and ethyl palmitate uniformly in dichloromethane, adding sodium hydroxide, heating to a fourth temperature for reaction, washing and purifying after the reaction is completed to obtain ethyl palmitate connected with polyoxyethylene, then mixing ethyl palmitate connected with polyoxyethylene with hexadecyl bromide, heating to a fourth temperature for reaction, and cooling to room temperature for purification to obtain modified ethyl palmitate; Step S3, adding an emulsifier to deionized water and stirring until completely dissolved, then adding modified ethyl palmitate and continuing stirring to obtain a modified emulsion; Step S4, adding a foam stabilizer and a foaming agent into deionized water, and then sequentially adding a modified emulsion, a modified aluminum silicate gelling agent, a cross-linking agent, an adsorbent, and a flame retardant and mixing them evenly to obtain an aluminum silicate gel fire extinguishing agent for lithium battery fire.

2. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S1: The mass of the polyvinyl alcohol is 3-5 g, the alcoholysis degree is 88.0±1.5 mole%, and the viscosity of the 4% aqueous solution is 3.3±0.5 mPa.s; The volume of deionized water used to dissolve polyvinyl alcohol is 180-200 mL; The first temperature is 80-90°C; The mass of the potassium dihydrogen phosphate is 3-5g; The volume of the deionized water used to dissolve potassium dihydrogen phosphate is 50-70 mL.

3. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S1: The mass of the aluminum silicate powder is 50-70g; The second temperature is 60-80°C; The reaction time of the second temperature is 2-3h; The third temperature is 50-60°C; The vacuum drying time is 8-10 hours.

4. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S2: The volume of the dichloromethane is 200-230mL; The mass of the polyoxyethylene is 10-15g; The mass of the palmitic acid ethyl ester is 50-60g; The mass of the sodium hydroxide is 0.3-0.5g; The fourth temperature is 60-70°C.

5. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S2: The reaction time of adding sodium hydroxide is 2-4h; The mass of the hexadecyl bromide is 10-15g; The reaction time of adding hexadecyl bromide is 2-3h.

6. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S3: The volume of the deionized water is 100-120 mL; The emulsifier is Tween 20, with a mass of 2-3 g.

7. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S3: The mass of the modified ethyl palmitate is 30-40g; The stirring time is 20-30 min.

8. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: In step S4: The foam stabilizer is triethylene glycol monobutyl ether; The foaming agent is sodium α-olefin sulfonate; The cross-linking agent is sodium bicarbonate; The adsorbent is activated carbon; The flame retardant is zinc borate.

9. The method for preparing an aluminum silicate gel fire extinguishing agent for lithium battery fire according to claim 1, characterized in that: The mass parts of each component are: Foam stabilizer: 8-10 parts; Foaming agent: 1-2 parts; Deionized water: 50-70 parts; Modified emulsion: 15-25 parts; Modified aluminum silicate gelling agent: 5-10 parts; Cross-linking agent: 1-3 parts; Adsorbent: 2-5 parts; Flame retardant: 1-3 parts.

10. An aluminum silicate gel fire extinguishing agent for lithium battery fire obtained according to the preparation method according to any one of claims 1 to 9.

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