Foam fire extinguishing agent and preparation method thereof

Abstract

The present invention discloses a foam fire extinguishing agent and a preparation method thereof. This invention relates to the technical field of aqueous film-forming fire extinguishing agents. The foam fire extinguishing agent comprises the following raw materials: a solvent, a foaming agent, a dispersant, an antifreeze agent, and water; the foaming agent comprises at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramidopropyl betaine, sodium lauramidoamphoacetate, octylphenol polyoxyethylene ether, ammonium ethoxylate sulfate, sodium decyl sulfate, and sodium dodecyl sulfate. The foam fire extinguishing agent provided by the present invention has low surface tension, good fluidity, and can produce a foam with a uniform and stable structure. It has excellent fire extinguishing effectiveness and is capable of extinguishing fires containing 15% polar fuel, and is particularly effective in extinguishing hydrocarbon fires.

Description

Technical Field

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

[0002] Hydrocarbon fuel fires, due to their high heat release and difficulty in extinguishing, have always been a key area of ​​research in the field of fire suppression. Foam fire extinguishing agents are commonly used to extinguish hydrocarbon fires due to their low surface tension and the tendency to form a hydrophobic layer.

[0003] Currently, commonly used foam fire extinguishing agents are primarily protein and fluoroprotein foams, which have drawbacks such as a short shelf life and strong odor. Commonly used aqueous film-forming foams, due to their use of chemically stable fluorocarbon surfactants, present safety and environmental concerns. Fluorine-free synthetic foams also suffer from low efficiency. Summary of the Invention

[0004] The main purpose 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, a stable oleophobic layer, the ability to extinguish fuels containing 15% polarity, 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 agent and water;

[0006] The foaming agent includes at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramide propyl betaine, sodium lauramide amphoacetate, octylphenol polyoxyethylene ether, ethoxylated alcohol ammonium sulfate, sodium decyl sulfate and sodium lauryl sulfate.

[0007] In one embodiment, 100 parts of the foam fire extinguishing agent include the following raw materials, calculated 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.

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

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

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

[0011] In one embodiment, the antifreeze agent 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 agent are added and mixed to obtain a solvent system;

[0015] 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.

[0016] In one embodiment, 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",

[0017] The stirring speed of the stirring and mixing is 10 to 100 rpm.

[0018] In one embodiment, 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",

[0019] The stirring and mixing time is 24 to 48 hours.

[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 agent, and water. The foaming agent is compounded using at least three of the aforementioned hydrocarbon surfactants. The resulting foaming agent has low surface tension, can quickly form a stable oleophobic layer, and has good fluidity. The resulting foam structure is uniform and stable, enabling rapid cooling and fire control. It also isolates the fuel from air through a prolonged, sealed barrier, resulting in excellent fire extinguishing effectiveness. Compared to fire extinguishing agents using a single foaming agent, the foam fire extinguishing agent prepared using the aforementioned foaming agent has lower surface tension, lower interfacial tension with flammable liquid hydrocarbons, and a higher diffusion coefficient, making it easier for the foam fire extinguishing agent to spread on the surface, achieving the purpose of rapid fire extinguishing. Furthermore, the foam fire extinguishing agent has the beneficial effects of a long shelf life and biodegradability.

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

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. Where the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Hydrocarbon fuel fires, due to their high heat release and difficulty in extinguishing, have always been a key area of ​​research in the field of fire suppression. Foam fire extinguishing agents are commonly used to extinguish hydrocarbon fires due to their low surface tension and the tendency to form a hydrophobic layer.

[0024] Currently, commonly used foam fire extinguishing agents are primarily protein and fluoroprotein foams, which have drawbacks such as a short shelf life and strong odor. Commonly used aqueous film-forming foams, due to their use of chemically stable fluorocarbon surfactants, present safety and environmental concerns. Fluorine-free synthetic foams also suffer from low efficiency.

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

[0026] The foaming agent includes at least three of alkyl polyglycoside 0810, alkyl polyglycoside 1214, lauramide propyl betaine, sodium lauramide amphoacetate, octylphenol polyoxyethylene ether, ethoxylated alcohol ammonium sulfate, sodium decyl sulfate and sodium lauryl 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 agent 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 oleophobic layer and has good fluidity. The obtained foam structure is uniform and stable, thereby being able to quickly cool down and control the fire and isolate the contact between the fuel and the air through a long period of sealing, thereby having an excellent fire extinguishing effect. Compared with the fire extinguishing agent using a single foaming agent, the foam fire extinguishing agent prepared using the above-mentioned foaming agent has lower surface tension, lower interfacial tension with flammable liquid hydrocarbons, and a higher diffusion coefficient, making it easier for the foam fire extinguishing agent to spread on its surface, thereby achieving the purpose of rapid fire extinguishing. In addition, the foam fire extinguishing agent also has the beneficial effects of a long shelf life and being biodegradable. Therefore, the foam fire extinguishing agent provided by the present invention has low surface tension, good fluidity, and can obtain a foam with a uniform and stable structure, has an excellent fire extinguishing effect, can extinguish fires containing 15% polar fuels, and has excellent effects when extinguishing hydrocarbon fires.

[0028] In one embodiment, 100 parts of the foam fire extinguishing agent include the following raw materials, calculated 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.

[0029] The present invention provides a high-concentration foam fire extinguishing agent that can be mixed with water for use. Using too little foaming agent results in poor foaming effect, requiring a higher mixing ratio with water, which contradicts the high-concentration property. Furthermore, because the foaming agent contains hydrocarbon-based substances, using too much can reduce fire extinguishing effectiveness and prolong extinguishing time. Therefore, the foam fire extinguishing agent is prepared using the above-mentioned raw materials in the aforementioned mass fractions, with a minimum mixing ratio of 0.4%, which can reduce the space required to store the fire extinguishing agent. The foam fire extinguishing agent also has low viscosity, good fluidity, and is easily soluble in water. After mixing with water, the foam solution has low surface tension and a strong oleophobic layer, enabling rapid extinguishing of hydrocarbon flames.

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

[0031] Alkyl glycoside is synthesized from natural fatty alcohols and glucose through biotechnology. It is a new type of non-ionic surfactant with comprehensive performance. It has the characteristics of both ordinary non-ionic and anionic surfactants. It usually has a sugar group and a long alkyl chain of 8 to 16 carbon atoms.

[0032] Alkyl Glucoside 0810 (AGS0810) consists of one or more sugar groups and an alkyl chain with 8 to 10 carbon atoms. This structure allows AGS0810 to be both water-soluble and capable of binding to oily substances, resulting in excellent emulsification, dispersion, and detergency properties. Furthermore, because it is derived from natural raw materials, it is also biodegradable and environmentally friendly. In AGS0810, "0810" refers to the carbon atom distribution of its alkyl chain. Specifically, it refers to the predominantly 8 to 10 carbon atoms in the alkyl chain. This specific carbon chain length distribution imparts AGS0810 with unique surface activity and solubility properties, enabling its widespread application in detergents, cosmetics, and other fields.

[0033] Alkyl glycoside 1214 contains one or more sugar groups and an alkyl chain with 12 to 14 carbon atoms. It is widely used in detergents, cosmetics, and other fields due to its low surface tension, good detergency, good solubility, resistance to high temperatures, strong alkalis, and high-concentration electrolytes, and excellent thickening effect.

[0034] Lauramidopropyl betaine, also known as N-(carboxymethyl)-N,N-dimethyl-3-[(1-oxododecyl)amino]-1-propylammonium inner salt hydroxide, exhibits bactericidal properties, good biodegradability, excellent foaming and thickening properties, and possesses excellent solubility and compatibility. Its use in combination with other detergents can significantly improve the softening, conditioning, and low-temperature stability of detergents, and has a wide range of applications in detergents and skincare.

[0035] The present application improves the raw materials for preparing detergents and applies them to the preparation of fire extinguishing agents. By using alkyl polyglycoside 0810 as the main foaming agent, the foaming performance is excellent and the foam is rich. At the same time, alkyl polyglycoside 1214 is used for synergistic foaming to improve the foaming ability of the fire extinguishing agent, achieving the effect of fine foaming, balanced foam and small diameter. In addition, lauramidopropyl betaine is used to stabilize the foam and prolong the liquid separation time of the above two surfactants, thereby making the obtained foam structure uniform and stable.

[0036] Fire extinguishing efficiency is primarily determined by the uniformity of the foam structure. The thickness of the water film formed between bubbles is a key factor in determining the liquid separation time, a crucial indicator for foam fire extinguishing. The foaming agent formulated using the aforementioned three surfactants rapidly forms an oleophobic layer and exhibits excellent fluidity, enabling rapid cooling and fire control while maintaining a sealed barrier to isolate the fuel from air for an extended period. Furthermore, the surfactants used in this foaming agent are free of harmful fluorinated surfactants and protein-containing substances with a short shelf life. They are 99.5% biodegradable, environmentally friendly, non-toxic, and have a long shelf life.

[0037] In one embodiment, the mass ratio of alkyl glycoside 0810, alkyl glycoside 1214, and lauramidopropyl betaine in the foaming agent is 1:(0.5-1):(0.8-2). Using the foaming agent obtained in this mass ratio to produce a fire extinguishing agent can achieve low surface tension, good fluidity, and produce a uniform and stable foam structure, while also providing excellent fire extinguishing effectiveness.

[0038] Furthermore, the dispersant includes one or two of polyoxyethylene sorbitan monooleate, diethanolamine, triethanolamine, isooctyl polyoxyethylene ether sulfate, laureth 23, hexadecanoic acid, and octadecanoic acid. Using the above substances as dispersants can adjust the viscosity of the foam fire extinguishing agent, resulting in better foam stabilization, longer liquid separation time, and improved pH value of the product, thereby maximizing the effect of each component in the fire extinguishing agent.

[0039] In some embodiments, the antifreeze agent includes one or both of ethylene glycol and propylene glycol. Ethylene glycol and propylene glycol are added to the fire extinguishing agent as antifreeze agents to improve the fire extinguishing agent's low-temperature performance. The raw materials are widely available 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 not only dissolves related substances but also has certain foaming and foam stability properties, which can assist the foaming agent in functioning. In addition to serving as a solvent to dissolve other components in the foam fire extinguishing agent, 2-methyl-2,4-pentanediol also has good antifreeze properties and permeability, making this product not only highly effective in extinguishing hydrocarbon fires, but also somewhat effective in extinguishing solid fires.

[0041] The present invention improves the formula of daily chemical products and applies them to fire-fighting products. In the selection of foaming agents (surfactants), the fluorocarbon surfactants commonly used in fire-fighting foams are avoided, sacrificing some surface tension and liquid separation time performance, but being more environmentally friendly. And through the compounding of specific surfactants, the surface tension of this product can be guaranteed to be lower than 30mN / m, and the corrosion rate is also low. The obtained fire extinguishing agent can form a dense foam blanket on the surface of the fuel, with strong resistance to re-ignition; the freezing point is lower than -10°C, and it can be used in low-temperature environments, and can be mixed with 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 method for preparing the foam fire extinguishing agent as described above, comprising the following steps:

[0043] After mixing the solvent with water, a dispersant and an antifreeze agent are added and mixed to obtain a solvent system;

[0044] 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.

[0045] In this scheme, the solvent and water are first mixed to create a basic liquid system, and then dispersants and antifreeze agents, as well as other substances with specific functions such as anti-burning agents, preservatives, and co-solvents are added and mixed evenly to obtain a solvent system;

[0046] Subsequently, different components of the foaming agent are sequentially added to the solvent system, stirred and mixed, and the mixture is allowed to stand for a period of time before filtering the precipitate to obtain a foam fire extinguishing agent. Sequentially adding different components of the foaming agent refers to sequentially adding the substances that make up the foaming agent. In some embodiments, the foaming agent includes alkyl glycoside 0810, alkyl glycoside 1214, and lauramidopropyl betaine. Alkyl glycoside 0810 is first added to the solvent system, and after uniform mixing, alkyl glycoside 1214 is added. After uniform mixing, lauramidopropyl betaine is added. After stirring for a period of time, the system is allowed to stand for a period of time, and the precipitate is filtered to obtain a foam fire extinguishing agent.

[0047] In some embodiments, the stirring and mixing is performed at a speed of 10 to 100 rpm. Specifically, the stirring and mixing can be performed at a speed of 10 rpm, 40 rpm, 80 rpm, 100 rpm, etc. Low-speed stirring can reduce splashing and foaming caused by rapid rotation of the material, thereby enabling the various components in the mixture to be fully and evenly mixed. At a rotation speed of 10 to 100 rpm, the agitator can gradually and steadily disperse the different components in the mixture evenly, avoiding splashing of materials or localized overmixing caused by excessively fast stirring speeds, thereby improving the overall quality of the mixture.

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

[0049] The technical solutions of the present invention are 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] Provided is a foam fire extinguishing agent, wherein the raw material components and corresponding mass parts per 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] The mass ratio of alkyl glycoside 0810, alkyl glycoside 1214 and lauryl amide propyl 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 agent is ethylene glycol.

[0056] Example 2

[0057] Provided is a foam fire extinguishing agent, wherein the raw material components and corresponding mass parts per 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 agent, and 15 parts of water;

[0058] The mass ratio of alkyl glycoside 0810, alkyl glycoside 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 agent is ethylene glycol.

[0062] Example 3

[0063] Provided is a foam fire extinguishing agent, wherein the raw material components and corresponding mass parts per 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 agent, and 63 parts of water;

[0064] The mass ratio of alkyl glycoside 0810, alkyl glycoside 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 agent is ethylene glycol.

[0068] In Examples 4 to 7 and Comparative Examples 1 to 3, except for the different composition of the foaming agent, the other ingredients and amounts are the same as those in Example 3. The foaming agent in Examples 4 to 7 and Comparative Examples 1 to 3 includes the following components, as shown in Table 1:

[0069] Table 1: Table of foaming agent components in Examples 4 to 7 and Comparative Examples 1 to 3

[0070]

[0071] Performance Testing

[0072] 1. The physicochemical properties and fire extinguishing performance of the foam fire extinguishing agents of Examples 1 to 7 and Comparative Examples 1 to 3 were tested. At the same time, BFF 0.5% purchased from Germany's 17 Company was also tested as a control group. The physicochemical properties included surface tension, interfacial tension (the oil phase was E10 gasoline), and diffusion coefficient; the fire extinguishing performance included extinguishing time, anti-burn time, foaming ratio, and 25% liquid separation time. The test method was based on the national standard GB / T 15308-2006. Three replicates were performed for each group. The test results are detailed in the table below.

[0073] Table 2 Test results of physical and chemical properties of foam fire extinguishing agent

[0074]

[0075]

[0076] Table 3 Fire extinguishing performance test results of foam fire extinguishing agent

[0077] Group Fire extinguishing time / s Burning time / s Foaming multiple 25% drainage time / min Standard requirements ≤180s ≥600s ≥7 ≥2.5 minutes 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 Tables 2 and 3, the fire extinguishing performance of the fire extinguishing agents obtained in Examples 1 to 7 is superior to that of Comparative Examples 1 to 3, and the fire extinguishing performance is improved. Examples 1 to 7 use three surfactants together, and the resulting fire extinguishing agents have low surface tension, high foaming multiple, low interfacial tension, and can spread on the oil surface, thereby extinguishing the fire in a shorter time. Comparative Examples 1 to 3 use alkyl polyglycoside 0810, alkyl polyglycoside 1214, and lauramidopropyl betaine as surfactants respectively. The resulting fire extinguishing agents have high surface tension, low foaming multiple, high interfacial tension, and a negative diffusion coefficient. The aqueous film-forming foam fire extinguishing agent cannot spread on the oil surface, thereby prolonging the fire extinguishing time and failing to extinguish the fire within the effective time.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of the present invention.

Claims

1. A foam fire extinguishing agent, characterized in that: Includes the following raw materials: solvent, foaming agent, dispersant, antifreeze and water; Wherein, the foaming agent includes alkyl glycoside 0810, alkyl glycoside 1214 and lauramidopropyl betaine; 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).

2. The foam fire extinguishing agent according to claim 1, characterized in that: Calculated by mass, 100 parts of the foam fire extinguishing agent include the following raw materials: 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 dispersant includes one or two of polyoxyethylene sorbitan monooleate, diethanolamine, triethanolamine, isooctyl polyoxyethylene ether sulfate, laureth 23, hexadecanoic acid, and octadecanoic acid.

4. 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.

5. 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.

6. A method for preparing a foam fire extinguishing agent according to any one of claims 1 to 5, 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.

7. The method for preparing a foam fire extinguishing agent according to claim 6, wherein: 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 10-100 rpm.

8. The method for preparing a foam fire extinguishing agent according to claim 6, wherein: 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 mixing time of the stirring and mixing is 24 to 48 hours.

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