Foam extinguishing agent and preparation method thereof

Abstract

The invention discloses a foam extinguishing agent and a preparation method thereof. The invention relates to the technical field of aqueous film-forming fire extinguishing agents. The foam extinguishing agent comprises the following raw materials: a solvent, a foaming agent, a dispersing agent, an anti-freezing agent and water, the foaming agent is prepared from at least three of alkyl glycoside 0810, alkyl glycoside 1214, lauramide propyl betaine, lauramide amphoteric sodium acetate, octylphenol polyoxyethylene ether, ethyoxyl alcohol ammonium sulfate, decyl sodium sulfate and lauryl sodium sulfate. The foam extinguishing agent provided by the invention is low in surface tension, has good fluidity, can obtain foam with a uniform and stable structure, has an excellent extinguishing effect, can extinguish fire disasters containing 15% of polar fuel, and has an excellent effect when extinguishing hydrocarbon fire disasters.

Description

Technical Field

[0001] The present invention relates to the technical field of aqueous film-forming fire extinguishing agents, and particularly to a foam fire extinguishing agent and a preparation method thereof. Background Art

[0002] Hydrocarbon fuel fires are always a key research direction in the field of fire extinguishing because they release high heat energy during combustion and are not easy to extinguish. Foam fire extinguishing agents are usually used to extinguish hydrocarbon fires because of their small surface tension and easy formation of a hydrophobic layer.

[0003] Currently, the commonly used foam fire extinguishing agents are mainly protein and fluoroprotein foam liquids, which have disadvantages such as short shelf life and strong odor. And the commonly used aqueous film-forming foam fire extinguishing agents have safety and environmental protection problems due to the use of fluorocarbon surfactants with stable chemical properties. The fluorine-free synthetic foam liquids have problems of low efficiency. Summary of the Invention

[0004] The main object of the present invention is to provide a foam fire extinguishing agent and a preparation method thereof, aiming to solve the problem of low fire extinguishing efficiency of existing fire extinguishing agents when extinguishing hydrocarbon fires, and to provide a foam fire extinguishing agent with a long shelf life, biodegradability, low surface activity, stable oil-repellent layer, capable of extinguishing fuels containing 15% polar components, and high fire extinguishing efficiency.

[0005] To achieve the above object, the present invention provides a foam fire extinguishing agent, comprising the following raw materials: a solvent, a foaming agent, a dispersant, an antifreeze, and water;

[0006] Wherein, the foaming agent comprises at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramidopropyl betaine, lauramido amphoacetate, octylphenol polyoxyethylene ether, ethoxylated alcohol ammonium sulfate, sodium decyl sulfate, and sodium dodecyl sulfate.

[0007] In one embodiment, by mass, 100 parts of the foam fire extinguishing agent comprises the following raw materials: 15 - 35 parts of the solvent, 20 - 40 parts of the foaming agent, 1 - 5 parts of the dispersant, 1 - 5 parts of the antifreeze, and the balance is water.

[0008] In one embodiment, the foaming agent comprises alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine.

[0009] In one embodiment, in the foaming agent, the mass ratio of alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine is 1:(0.5 - 1):(0.8 - 2).

[0010] In one embodiment, the dispersant comprises one or two of polyoxyethylene sorbitan monooleate, diethanolamine, triethanolamine, isooctyl alcohol polyoxyethylene ether sulfate, laureth-23, hexadecanoic acid, and octadecanoic acid.

[0011] In one embodiment, the antifreeze includes one or both of ethylene glycol and propylene glycol.

[0012] In one embodiment, the solvent includes one or both of diethylene glycol butyl ether and 2-methyl-2,4-pentanediol.

[0013] The present invention also provides a method for preparing the foam fire extinguishing agent as described above, comprising the following steps:

[0014] After mixing the solvent with water, a dispersant and an antifreeze are added and mixed to obtain a solvent system.

[0015] Different components of the foaming agent are sequentially added to the solvent system, stirred and mixed, and then filtered after standing to obtain the foam fire extinguishing agent.

[0016] In one embodiment, in the step of "sequentially adding different components of the foaming agent to the solvent system, stirring and mixing, filtering after standing to obtain the foam fire extinguishing agent",

[0017] The stirring speed of the stirring and mixing is 10-100 rmp.

[0018] In one embodiment, in the step of "sequentially adding different components of the foaming agent to the solvent system, stirring and mixing, filtering after standing to obtain the foam fire extinguishing agent",

[0019] The mixing time of the stirring and mixing is 24-48 h.

[0020] In the technical solution of the present invention, a foam fire extinguishing agent is prepared by mixing a solvent, a foaming agent, a dispersant, an antifreeze and water. At least three of the above-mentioned hydrocarbon surfactants are compounded, and the obtained foaming agent has a low surface tension, can quickly form a stable oil-repellent layer, has good fluidity, and the obtained foam structure is uniform and stable. Therefore, it can quickly cool down and control the fire, and isolate the contact between the fuel and air through long-term sealing, and has excellent fire extinguishing effects. Compared with the fire extinguishing agent using a single foaming agent, the foam fire extinguishing agent prepared by using the above foaming agent has a lower surface tension, a lower interfacial tension with flammable liquid hydrocarbons, and a higher diffusion coefficient, making the foam fire extinguishing agent more likely to spread on its surface, achieving the purpose of quickly extinguishing the fire. In addition, the foam fire extinguishing agent also has the beneficial effects of a long shelf life and biodegradability.

[0021] Therefore, the foam fire extinguishing agent provided by the present invention has a low surface tension, good fluidity, can obtain a foam with a uniform and stable structure, has excellent fire extinguishing effects, can extinguish fires containing 15% polar fuel, and has excellent effects in extinguishing hydrocarbon fires. Specific Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. For those not specified in the embodiments, they shall be carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase. In addition, the meaning of "and / or" that appears throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] Hydrocarbon fuel fires have always been a key research direction in the field of fire extinguishing because of their high heat release during combustion and difficulty in extinguishing. Foam extinguishing agents are usually used to extinguish hydrocarbon fires because they have a small surface tension and are easy to form a hydrophobic layer.

[0024] The currently commonly used foam extinguishing agents are mainly protein and fluoroprotein foam liquids, which have disadvantages such as short shelf life and strong odor. The commonly used aqueous film-forming foam extinguishing agents have safety and environmental protection problems due to the use of fluorocarbon surfactants with stable chemical properties. The fluorine-free synthetic foam liquids have problems of low efficiency.

[0025] In view of this, the present invention proposes a foam extinguishing agent, which comprises the following raw materials: a solvent, a foaming agent, a dispersant, an antifreeze, and water;

[0026] Among them, the foaming agent comprises at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramidopropyl betaine, lauramido amphoacetate, octylphenol polyoxyethylene ether, ethoxylated alcohol ammonium sulfate, sodium decyl sulfate, and sodium dodecyl sulfate.

[0027] In the technical solution of the present invention, a foam fire extinguishing agent is prepared by mixing a solvent, a foaming agent, a dispersant, an antifreeze and water. At least three of the above-mentioned hydrocarbon surfactants are compounded to obtain a foaming agent with low surface tension, which can quickly form a stable oil-repellent layer, has good fluidity, and the obtained foam structure is uniform and stable. Therefore, it can quickly reduce the temperature and control the fire, and isolate the contact between the fuel and the air through a long-term airtightness, having excellent fire extinguishing effect. Compared with the fire extinguishing agent using a single foaming agent, the foam fire extinguishing agent prepared with the above-mentioned foaming agent has a lower surface tension, a lower interfacial tension with flammable liquid hydrocarbons, and a higher diffusion coefficient, making the foam fire extinguishing agent easier to spread on its surface to achieve the purpose of quickly extinguishing the fire. In addition, the foam fire extinguishing agent also has the beneficial effects of long shelf life and biodegradability. Therefore, the foam fire extinguishing agent provided by the present invention has a low surface tension, good fluidity, and can obtain a foam with a uniform and stable structure, has excellent fire extinguishing effect, can extinguish fires containing 15% polar fuel, and has excellent effect in extinguishing hydrocarbon fires.

[0028] In one embodiment, by mass, 100 parts of the foam fire extinguishing agent comprises the following raw materials: 15 - 35 parts of a solvent, 20 - 40 parts of a foaming agent, 1 - 5 parts of a dispersant, 1 - 5 parts of an antifreeze, and the balance is water.

[0029] The present invention provides a high-concentration foam fire extinguishing agent, which can be used by mixing with water during use. If the amount of the foaming agent is too small, the foaming effect will be poor, and the mixing ratio with water needs to be increased during use, which is contrary to the characteristics of high concentration; and since the substances in the foaming agent have a hydrocarbon group structure, if the amount is too large, the fire extinguishing effect will be reduced and the fire extinguishing time will be long. Therefore, the foam fire extinguishing agent prepared with the above-mentioned raw materials by mass has a minimum mixing ratio of 0.4%, which can reduce the space for storing the fire extinguishing agent; and it has a low viscosity, good flowability, and is easily soluble in water; the surface tension of the foam solution after mixing with water is low, and the oil-repellent layer ability is strong, and it can quickly extinguish hydrocarbon open flames.

[0030] In one embodiment, the foaming agent comprises alkyl polyglycoside 0810, alkyl polyglycoside 1214 and lauramidopropyl betaine.

[0031] Alkyl polyglycoside is synthesized by natural fatty alcohol and glucose through biotechnology. It is a new type of non-ionic surfactant with relatively comprehensive properties, combining the characteristics of ordinary non-ionic and anionic surfactants. It usually has a sugar group and an alkyl long chain with 8 to 16 carbon atoms.

[0032] Alkyl polyglycoside 0810 contains one or more glycosyl groups and an alkyl chain with 8 to 10 carbon atoms. This structure enables alkyl polyglycoside 0810 to have both water solubility and the ability to combine with oily substances, thus achieving excellent emulsifying, dispersing, and detergency properties. In addition, due to its origin from natural raw materials, it also has good biodegradability and environmental friendliness. In alkyl polyglycoside 0810, "0810" represents the carbon atom number distribution of its alkyl chain. Specifically, it means that in the alkyl chain of this alkyl polyglycoside, the carbon atom number is mainly distributed between 8 and 10. This specific carbon chain length distribution endows alkyl polyglycoside 0810 with specific surface activity and solubility properties, making it widely used in fields such as detergents and cosmetics.

[0033] Alkyl polyglycoside 1214 contains one or more glycosyl groups and an alkyl chain with 12 to 14 carbon atoms. Because of its low surface tension, good detergency, good solubility, high temperature resistance, strong alkali resistance, and high concentration electrolyte resistance, and having a good thickening effect, it has a wide range of applications in fields such as detergents and cosmetics.

[0034] Lauramidopropyl betaine, also known as N-(carboxymethyl)-N,N-dimethyl-3-[(1-oxododecyl)amino]-1-propanaminium inner salt hydroxide, has bactericidal properties, good biodegradability, excellent foaming properties, significant thickening properties, excellent solubility, and compatibility. When used in combination, it can significantly improve the softness, conditioning, and low-temperature stability of washing products, and has a wide range of applications in the fields of detergents and skin care.

[0035] In this application, the raw materials for preparing detergents are improved and applied to the preparation of fire extinguishers. By using alkyl polyglycoside 0810 as the main foaming agent, it has excellent foaming performance and rich foam; at the same time, alkyl polyglycoside 1214 is used to synergistically foam to improve the foaming ability of the fire extinguisher, achieving the effects of delicate foaming, balanced foam, and small diameter; in addition, using lauramidopropyl betaine at the same time serves to stabilize the foam and extend the liquid separation time for the above two surfactants, thereby making the obtained foam structure uniform and stable.

[0036] The efficiency of fire extinguishing is mainly determined by the degree of uniformity of the foam structure. The thickness of the water film formed between foams is the key factor determining the liquid separation time, an important index for foam fire extinguishing. The foaming agent obtained by compounding the above three surfactants can quickly form an oil-repellent layer with good fluidity, thereby achieving rapid cooling to control the fire and isolating the contact between fuel and air through long-term sealing. In addition, the surfactants used in the above foaming agent do not contain fluorosurfactants harmful to the human body, do not contain protein substances with a short shelf life, can be 99.5% biodegradable, are environmentally friendly and non-toxic, and have a long shelf life.

[0037] In one embodiment, in the foaming agent, the mass ratio of alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine is 1:(0.5 - 1):(0.8 - 2). Using the foaming agent with the above mass ratio to prepare the fire extinguishing agent can result in the effects of low surface tension, good fluidity, and a uniformly stable foam structure, while also having excellent fire extinguishing performance.

[0038] Further, the dispersant includes one or two of polyoxyethylene sorbitan monooleate, diethanolamine, triethanolamine, isooctyl polyoxyethylene ether sulfate, lauryl alcohol polyether 23, palmitic acid, and stearic acid. Using the above substances as the dispersant can adjust the viscosity of the foam fire extinguishing agent, making the fire extinguishing agent have better foam stability, a longer drainage time, and can improve the pH value of this product, and maximize the effects of each component in the fire extinguishing agent as much as possible.

[0039] In some embodiments, the antifreeze includes one or both of ethylene glycol and propylene glycol. Adding ethylene glycol and propylene glycol as antifreeze to the fire extinguishing agent can endow the fire extinguishing agent with good low-temperature performance, and the raw materials are widely sourced and the application technology is mature.

[0040] The solvent and water can dissolve other components in the foam fire extinguishing agent. In some embodiments, the solvent includes one or both of diethylene glycol butyl ether and 2-methyl-2,4-pentanediol. Diethylene glycol butyl ether can not only dissolve related substances, but also has certain foaming and foam stabilizing properties, and can assist the foaming agent to play its role. In addition to being used as a solvent to dissolve other components in the foam fire extinguishing agent, 2-methyl-2,4-pentanediol also has good antifreeze and penetration properties, enabling this product to not only have good ability to extinguish hydrocarbon fires, but also have certain ability to extinguish solid fires.

[0041] The present invention improves the formula of daily chemical products and applies it to fire protection products. In the selection of the foaming agent (surfactant), the commonly used fluorocarbon surfactant in fire fighting foam is avoided, sacrificing some surface tension and drainage time performance, but being more environmentally friendly. And through the compounding of specific surfactants, it can be ensured that the surface tension of this product is lower than 30 mN / m and the corrosion rate is also relatively low. The obtained fire extinguishing agent can form a dense foam blanket on the fuel surface, with strong resistance to reignition; the freezing point is lower than -10°C, it can be used in low-temperature environments, and can be used with mixed hard water and seawater at the same time; the expansion ratio can reach 20 times and the foaming is stable.

[0042] The present invention also provides a preparation method of the foam fire extinguishing agent as described above, including the following steps:

[0043] After mixing the solvent and water, add the dispersant and antifreeze and mix them to obtain a solvent system;

[0044] In the solvent system, different components of the foaming agent are added in sequence, stirred and mixed, and after standing, filtered to obtain the foam fire extinguishing agent.

[0045] In this solution, first, the solvent and water are mixed to create a basic liquid system, and then a dispersant, an antifreeze agent, and other substances with specific functions such as a fire resistance agent, a preservative, a co-solvent, etc. are added and mixed evenly to obtain the solvent system;

[0046] Subsequently, different components of the foaming agent are added in sequence to the solvent system, stirred and mixed, and after standing, the precipitate is filtered to obtain the foam fire extinguishing agent. Adding different components of the foaming agent in sequence means adding the substances that make up the foaming agent in sequence. In some embodiments, the foaming agent includes alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine. First, alkyl polyglycoside 0810 is added to the solvent system. After uniform mixing, alkyl polyglycoside 1214 is added. After uniform mixing, lauramidopropyl betaine is added. After stirring for a period of time, the system is allowed to stand, and then the precipitate is filtered to obtain the foam fire extinguishing agent.

[0047] In some embodiments, the stirring speed of the stirring and mixing is 10 - 100 rmp. Specifically, the stirring speed of the stirring and mixing can be 10 rmp, 40 rmp, 80 rmp, 100 rmp, etc. Using low-speed stirring can reduce the splashing and foaming of the materials caused by rapid rotation, and enable the components in the mixture to be fully and evenly mixed. At a rotational speed of 10 - 100 rpm, the stirrer can gradually and stably disperse different components in the mixture evenly, avoiding material splashing or local over-mixing caused by too fast stirring speed, thereby improving the overall quality of the mixture.

[0048] In one embodiment, the mixing time of the stirring and mixing is 24 - 48 h. Specifically, the mixing time of the stirring and mixing is 24 h, 36 h, 48 h, etc. The long stirring process can enhance the uniformity and stability of the mixture. The components in the mixture have sufficient time to penetrate and fuse with each other, making the system more uniform and stable.

[0049] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0050] Example 1

[0051] Provide a foam fire extinguishing agent. The raw material components and corresponding mass parts of every 100 parts of the foam fire extinguishing agent are: 25 parts of solvent, 35 parts of foaming agent, 4 parts of dispersant, 4 parts of antifreeze agent, and 32 parts of water;

[0052] Among them, the mass ratio of alkyl polyglycoside 0810, alkyl polyglycoside 1214 and lauramidopropyl betaine in the foaming agent is 1:1:1;

[0053] The solvent is diethylene glycol butyl ether;

[0054] The dispersant is polyoxyethylene sorbitan monooleate;

[0055] The antifreeze is ethylene glycol.

[0056] Example 2

[0057] Provide a foam fire extinguishing agent. The raw material components and corresponding mass parts of every 100 parts of the foam fire extinguishing agent are: 35 parts of solvent, 40 parts of foaming agent, 5 parts of dispersant, 5 parts of antifreeze, and 15 parts of water;

[0058] Among them, the mass ratio of alkyl polyglycoside 0810, alkyl polyglycoside 1214 and lauramidopropyl betaine in the foaming agent is 1:1:2;

[0059] The mass ratio of diethylene glycol butyl ether to 2-methyl-2,4-pentanediol in the solvent is 1:1;

[0060] The mass ratio of polyoxyethylene sorbitan monooleate, diethanolamine and triethanolamine in the dispersant is 1:1:1;

[0061] The antifreeze is ethylene glycol.

[0062] Example 3

[0063] Provide a foam fire extinguishing agent. The raw material components and corresponding mass parts of every 100 parts of the foam fire extinguishing agent are: 15 parts of solvent, 20 parts of foaming agent, 1 part of dispersant, 1 part of antifreeze, and 63 parts of water;

[0064] Among them, the mass ratio of alkyl polyglycoside 0810, alkyl polyglycoside 1214 and lauramidopropyl betaine in the foaming agent is 1:0.5:0.8;

[0065] The solvent is 2-methyl-2,4-pentanediol;

[0066] The dispersant is isooctyl polyoxyethylene ether sulfate;

[0067] The antifreeze is ethylene glycol.

[0068] In Examples 4 to 7 and Comparative Examples 1 to 3, except for the different compositions of the foaming agent, other components and dosages are the same as those in Example 3. The foaming agents in Examples 4 to 7 and Comparative Examples 1 to 3 include the following components, as shown in Table 1 specifically:

[0069] Table 1 Foaming agent component table in Examples 4 to 7 and Comparative Examples 1 to 3

[0070]

[0071] Performance test

[0072] 1. Physicochemical properties and fire extinguishing performance of the foam extinguishing agents of Examples 1-7 and Comparative Examples 1-3 were tested. At the same time, BFF 0.5% purchased from a German company was used as a control group for testing physicochemical properties and fire extinguishing performance. The physicochemical properties include surface tension, interfacial tension (the oil phase is E10 gasoline), and diffusion coefficient; the fire extinguishing performance includes fire extinguishing time, anti-burning time, foaming multiple, and 25% liquid separation time. The test method refers to the national standard GB / T 15308-2006. Each group was tested with three repeated experiments. The test results are shown in the following table.

[0073] Table 2 Test results of physicochemical properties of foam extinguishing agents

[0074]

[0075]

[0076] Table 3 Test results of fire extinguishing performance of foam extinguishing agents

[0077] Group Fire extinguishing time / s Fire resistance time / s Foaming multiple 25% liquid separation time / min Standard requirement ≤180s ≥600s ≥7 ≥2.5 min Example 1 65s ≥600s ≥7±10％ 6.8 Example 2 65s ≥600s ≥7±10％ 7.1 Example 3 67s ≥600s ≥7±10％ 3.1 Example 4 70s ≥600s ≥7±10％ 6.0 Example 5 72s ≥600s ≥7±10％ 5.7 Example 6 69s ≥600s ≥7±10％ 5.5 Example 7 75s ≥600s ≥7±10％ 6.0 Comparative Example 1 ≤180s 480s ≥7±10％ 2.4 Comparative Example 2 ≤180s 157s ≥7±10％ 2.3 Comparative Example 3 ≤180s 118s ≥7±10％ 1.8 Control group 66s ≥600s ≥7±10％ 6.9

[0078] As can be seen from Table 2 and Table 3, the fire extinguishing performance of the extinguishing agents obtained in Examples 1-7 is better than that of Comparative Examples 1-3, and the fire extinguishing performance has been improved. In Examples 1-7, three surfactants were used together, and the obtained extinguishing agent has low surface tension, high foam multiple, and low interfacial tension, and can spread on the oil surface, and thus can extinguish fire in a short time. In Comparative Examples 1-3, alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine were used as surfactants alone, and the obtained extinguishing agent has high surface tension, low foam multiple, high interfacial tension, and negative diffusion coefficient. The aqueous film-forming foam extinguishing agent cannot spread on the oil surface, which leads to an extended fire extinguishing time and cannot extinguish fire within an effective time.

[0079] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A foam fire extinguishing agent, characterized in that: The raw materials include: solvent, foaming agent, dispersant, antifreeze agent and water; The foaming agent includes at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramide propyl betaine, lauramide sodium amphoteric acetate, octylphenol polyoxyethylene ether, ethoxylated alcohol ammonium sulfate, sodium decyl sulfate and sodium dodecyl sulfate.

2. The foam fire extinguishing agent according to claim 1, characterized in that: 100 parts of the foam fire extinguishing agent include the following raw materials by mass: 15-35 parts of solvent, 20-40 parts of foaming agent, 1-5 parts of dispersant, 1-5 parts of antifreeze agent, and the balance is water.

3. The foam fire extinguishing agent according to claim 1, characterized in that: The foaming agent includes alkyl polyglucoside 0810, alkyl polyglucoside 1214 and lauramidopropyl betaine.

4. The foam fire extinguishing agent according to claim 3, characterized in that: In the foaming agent, the mass ratio of alkyl glycoside 0810, alkyl glycoside 1214 and lauryl amide propyl betaine is 1:(0.5-1):(0.8-2).

5. The foam fire extinguishing agent according to claim 1, characterized in that: The dispersant includes one or two of polyoxyethylene sorbitan monooleate, diethanolamine, triethanolamine, isooctyl polyoxyethylene ether sulfate, laureth 23, hexadecanoic acid and octadecanoic acid.

6. The foam fire extinguishing agent according to claim 1, characterized in that: The antifreeze agent includes one or both of ethylene glycol and propylene glycol.

7. The foam fire extinguishing agent according to claim 1, characterized in that: The solvent includes one or both of diethylene glycol butyl ether and 2-methyl-2,4-pentanediol.

8. A method for preparing a foam fire extinguishing agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: After mixing the solvent with water, a dispersant and an antifreeze agent are added and mixed to obtain a solvent system; Different components of the foaming agent are added to the solvent system in sequence, stirred and mixed, allowed to stand and then filtered to obtain a foam fire extinguishing agent.

9. The method for preparing a foam fire extinguishing agent according to claim 8, characterized in that: In the step of "adding different components of the foaming agent to the solvent system in sequence, stirring and mixing, letting it stand and then filtering to obtain a foam fire extinguishing agent", The stirring speed of the stirring and mixing is 10 to 100 rpm.

10. The method for preparing a foam fire extinguishing agent according to claim 8, characterized in that: In the step of "adding different components of the foaming agent to the solvent system in sequence, stirring and mixing, letting it stand and then filtering to obtain a foam fire extinguishing agent", The stirring and mixing time is 24 to 48 hours.

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