A thermally responsive gel foam extinguishing agent based on a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer

Abstract

The application provides application of a polyoxyethylene-polyoxypropylene-polyoxyethylene tri-block copolymer in a foam extinguishing agent. The application also provides a foam extinguishing agent, which is a heat-responsive gel foam extinguishing agent based on the polyoxyethylene-polyoxypropylene-polyoxyethylene tri-block copolymer, and has heat response capability and excellent extinguishing performance. The heat-responsive gel foam extinguishing agent provided by the application exhibits good fluidity and foaming performance at normal temperature, and once the temperature reaches the critical gel temperature of the foam solution, the flowing foam rapidly changes into a gel foam in situ, and the stability of the foam is significantly improved. The foam extinguishing agent can be widely used in A and B class fires and other fires. In particular, the foam extinguishing agent forms a high-stable gel foam when extinguishing a fire, and has excellent anti-reignition performance.

Description

Technical Field

[0001] This invention belongs to the technical field of thermally responsive gel foam fire extinguishing agents, and relates to the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents and a foam fire extinguishing agent, particularly a thermally responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. Background Technology

[0002] Fire has been considered one of the major disasters by humankind since ancient times. Foam extinguishing agents play a crucial role in firefighting due to their excellent fire extinguishing performance and resistance to reignition. Foam extinguishing agents are typically generated through mechanical action or chemical reaction and applied to the surface of combustible solid or liquid materials to extinguish ongoing fires and effectively inhibit fuel reignition. The fire-fighting foam acting on the fuel surface forms a physical barrier to the transfer of oxygen and fuel vapors, effectively preventing combustible liquid vapors from contacting air, thereby disrupting the fire chain reaction. Simultaneously, the foam also acts as a good heat-covering layer, effectively shielding the burning surface from the heat radiation of the flames.

[0003] A stable foam layer can act as a good covering barrier on the fuel surface for a longer period of time. Therefore, improving the stability of foam can significantly improve its heat insulation, fire extinguishing, and anti-reignition properties. Currently, methods to significantly improve stability mainly include adding polymers or nanoparticles to block the liquid flow channels and liquid-phase gelation. However, these foams all have certain foaming difficulties and require unique foaming technologies. Furthermore, gel foams exhibiting high viscosity at ambient temperatures will generate significant flow resistance during pipeline transportation, easily leading to blockages in the foam system or foam pipelines.

[0004] Therefore, how to develop a foam fire extinguishing agent that solves the above-mentioned problems of current foam fire extinguishing agents has always been one of the focuses of attention for many technical personnel in the industry. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents and a foam fire extinguishing agent, especially a heat-responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. The foam fire extinguishing agent provided by the present invention has thermal response capability and excellent fire extinguishing performance.

[0006] This invention provides the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents.

[0007] Preferably, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer has a structure as shown in formula (I):

[0008]

[0009] Where x = 2 to 130, y = 15 to 67.

[0010] Preferably, the mass content of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the foam extinguishing agent is 1% to 20%;

[0011] The foam extinguishing agent includes a heat-responsive gel foam extinguishing agent.

[0012] Preferably, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer includes polyether F127.

[0013] This invention provides a foam fire extinguishing agent, comprising, by weight percentage:

[0014] 1% to 20% of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer;

[0015] Cosolvent 2%–12%;

[0016] Antibacterial agent 0.1%–0.5%;

[0017] Corrosion inhibitor 0.2%–1%;

[0018] The remaining water.

[0019] Preferably, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer has a structure as shown in formula (I):

[0020]

[0021] Where x = 2 to 130, y = 15 to 67;

[0022] The cosolvent includes diethyl butyl ether and / or 1,2-ethylidene glycol.

[0023] Preferably, the antibacterial agent includes one or more of sodium diacetate, sodium benzoate, 2-phenylphenol, and potassium sorbate;

[0024] The corrosion inhibitors include benzotriazole and / or methylbenzotriazole.

[0025] Preferably, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer includes polyether F127;

[0026] The foam extinguishing agent includes a heat-responsive gel foam extinguishing agent.

[0027] Preferably, the preparation method of the foam fire extinguishing agent includes the following steps:

[0028] 1) A foam fire extinguishing agent is obtained by mixing polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

[0029] Preferably, step 1) specifically includes the following steps:

[0030] 11) Premix the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer with water to obtain the first solution;

[0031] After mixing the antibacterial agent and the corrosion inhibitor, a first mixture is obtained;

[0032] 12) After further mixing the first mixture and the first solution obtained in the above steps, a second solution is obtained;

[0033] 13) After mixing the second solution obtained in the above steps with the co-solvent, add water and mix again to obtain the foam extinguishing agent.

[0034] This invention provides the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents. Compared with the prior art, this invention creatively applies polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer to foam fire extinguishing agents, resulting in a heat-responsive gel foam fire extinguishing agent with specific components and formulation based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. This fire extinguishing agent exhibits heat response capability and excellent fire extinguishing performance.

[0035] The heat-responsive gel foam extinguishing agent provided by this invention exhibits good flowability and foaming properties at room temperature. Once the temperature reaches the critical gelation temperature of the foam solution, the flowing foam rapidly transforms into gel foam in situ, significantly improving the foam's stability. It can be widely used for Class A and B fires and other fires.

[0036] The foam produced by this invention exhibits good flowability and foaming properties at room temperature. When applied to the surface of hot fuel, the flowing foam transforms into a high-viscosity gel foam, giving it excellent sealing and anti-reignition properties. After the fire is extinguished, the temperature drops, and the highly stable foam reversibly transforms into a less stable flowing foam, facilitating on-site cleanup. This extinguishing agent has low irritation to humans, excellent foaming and stability properties, and uses environmentally friendly and easily biodegradable raw materials, causing no environmental pollution. It can be widely used to extinguish Class A and Class B fires. In particular, the highly stable gel foam formed during fire extinguishing exhibits excellent anti-reignition properties.

[0037] Experimental results show that the surface tension of the extinguishing agent provided by this invention is 35-40 mN / m; the foaming ratio is 1-20; the half-life at room temperature (20℃) is less than 86 min, and the half-life at 45℃ can be greater than 48 hours; the extinguishing time is 50-100 s; and the anti-burning time can reach up to 21 min. Detailed Implementation

[0038] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0039] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0040] There are no particular restrictions on the purity of any of the raw materials used in this invention. However, it is preferred to use analytical grade or conventional purity used in the field of foam fire extinguishing agent preparation.

[0041] This invention provides the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents.

[0042] In this invention, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer preferably has the structure shown in formula (I):

[0043]

[0044] Preferably, x = 2 to 130, y = 15 to 67; more preferably, x = 30 to 100, y = 25 to 57; even more preferably, x = 60 to 70, y = 35 to 47.

[0045] In this invention, the mass content of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the foam fire extinguishing agent is preferably 1% to 20%, more preferably 5% to 20%, and even more preferably 7% to 17%.

[0046] In this invention, the foam extinguishing agent preferably includes a heat-responsive gel foam extinguishing agent.

[0047] In this invention, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer preferably includes polyether F127.

[0048] This invention provides a foam fire extinguishing agent, comprising, by weight percentage:

[0049] 1% to 20% of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer;

[0050] Cosolvent 2%–12%;

[0051] Antibacterial agent 0.1%–0.5%;

[0052] Corrosion inhibitor 0.2%–1%;

[0053] The remaining water.

[0054] In this invention, the amount of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer added is 1% to 20%, preferably 5% to 20%, and more preferably 7% to 17%.

[0055] In this invention, the amount of the co-solvent added is 2% to 12%, which can be 3% to 11%, and preferably 5% to 10%.

[0056] In this invention, the amount of the antibacterial agent added is 0.1% to 0.5%, preferably 0.15% to 0.5%, more preferably 0.2% to 0.5%, and even more preferably 0.3% to 0.5%.

[0057] In this invention, the amount of corrosion inhibitor added is 0.2% to 1%, which can be 0.2% to 0.8%, and preferably 0.2% to 0.5%.

[0058] In this invention, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer preferably has the structure shown in formula (I):

[0059]

[0060] Preferably, x = 2 to 130, y = 15 to 67; more preferably, x = 30 to 100, y = 25 to 57; even more preferably, x = 60 to 70, y = 35 to 47.

[0061] In this invention, the cosolvent preferably includes diethyl butyl ether and / or 1,2-ethylene glycol, more preferably diethyl butyl ether or 1,2-ethylene glycol.

[0062] In this invention, the antibacterial agent preferably includes one or more of sodium diacetate, sodium benzoate, 2-phenylphenol and potassium sorbate, more preferably sodium diacetate, sodium benzoate, 2-phenylphenol or potassium sorbate.

[0063] In this invention, the corrosion inhibitor preferably includes benzotriazole and / or methylbenzotriazole, more preferably benzotriazole or methylbenzotriazole.

[0064] In this invention, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer preferably includes polyether F127.

[0065] In this invention, the foam extinguishing agent preferably includes a heat-responsive gel foam extinguishing agent.

[0066] In this invention, the preparation method of the foam fire extinguishing agent preferably includes the following steps:

[0067] 1) A foam fire extinguishing agent is obtained by mixing polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

[0068] In this invention, step 1) preferably includes the following steps:

[0069] 11) Premix the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer with water to obtain the first solution;

[0070] After mixing the antibacterial agent and the corrosion inhibitor, a first mixture is obtained;

[0071] 12) After further mixing the first mixture and the first solution obtained in the above steps, a second solution is obtained;

[0072] 13) After mixing the second solution obtained in the above steps with the co-solvent, add water and mix again to obtain the foam extinguishing agent.

[0073] The present invention first premixes a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer with water to obtain a first solution;

[0074] The antibacterial agent and the corrosion inhibitor are mixed to obtain the first mixture.

[0075] The present invention further mixes the first mixture and the first solution obtained in the above steps to obtain a second solution.

[0076] Finally, the second solution obtained in the above steps is mixed with a co-solvent, and then water is added and mixed again to obtain a foam fire extinguishing agent.

[0077] To complete and refine the overall technical solution, better ensure the composition and proportion of the foam extinguishing agent, and further improve the extinguishing performance and thermal response performance of the foam extinguishing agent, the aforementioned thermally responsive gel foam extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer may specifically include the following:

[0078] A heat-responsive gel foam fire extinguishing agent based on a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, comprising the following components by weight percentage:

[0079] The composition consists of 1-20% polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, 2-12% cosolvent, 0.1-0.5% antibacterial agent, 0.2-1% corrosion inhibitor, and the balance being water.

[0080] Specifically, the structural formula of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is as follows:

[0081]

[0082] Where x = 2 to 130, y = 15 to 67.

[0083] Specifically, the co-solvent is selected from diethyl butyl ether and / or 1,2-ethylidene glycol.

[0084] Specifically, the antibacterial agent is one or more of sodium diacetate, sodium benzoate, 2-phenylphenol, and potassium sorbate.

[0085] Specifically, the corrosion inhibitor is benzotriazole and / or methylbenzotriazole.

[0086] Specifically, the extinguishing agent includes 1-20% of a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer.

[0087] Furthermore, the fire extinguishing agent provided by the present invention comprises 1-20% polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, preferably 5-20%. The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is the main thermally responsive surfactant of the present invention, which provides thermal responsive performance. Specifically, its aqueous solution behaves as a sol at room temperature, and rapidly transforms into a gel phase in situ after reaching the critical gel temperature. The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is preferably derived from polyether F127. In specific embodiments, the percentage of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the fire extinguishing agent is 2%, 5%, or 20%.

[0088] Furthermore, the fire extinguishing agent provided by the present invention comprises 2-12% co-solvent, preferably 5-10%. The co-solvent is preferably diethyl butyl ether (DIB) and 1,2-ethylene glycol. In a specific embodiment of the present invention, the co-solvent is a mixture of DIB and 1,2-ethylene glycol in a mass ratio of 1:1. In a specific embodiment, the co-solvent accounts for 6% of the weight percentage of the fire extinguishing agent.

[0089] Furthermore, the fire extinguishing agent provided by the present invention includes 0.1-0.5% of an antibacterial agent, preferably 0.3-0.5%. The antibacterial agent is preferably sodium diacetate. In a specific embodiment, the antibacterial agent accounts for 0.5% of the weight percentage of the fire extinguishing agent.

[0090] The fire extinguishing agent provided by this invention includes 0.2-1% corrosion inhibitor, preferably 0.2-0.5%. The corrosion inhibitor is preferably methylbenzotriazole. In a specific embodiment, the corrosion inhibitor accounts for 0.5% of the weight percentage of the fire extinguishing agent.

[0091] Furthermore, the remaining amount of the extinguishing agent provided by this invention is water.

[0092] Furthermore, the extinguishing agent is preferably composed of the following raw materials:

[0093] Polyether F127 2%, diethyl butyl ether 3%, 1,2-ethylene glycol 3%, sodium diacetate 0.5%, methylbenzotriazole 0.5%, balance water;

[0094] Alternatively, it may contain 5% polyether F127, 3% diethyl butyl ether, 3% 1,2-ethylene glycol, 0.5% sodium diacetate, 0.5% methylbenzotriazole, and the balance being water.

[0095] Polyether F127 20%, diethyl butyl ether 3%, 1,2-ethylene glycol 3%, sodium diacetate 0.5%, methylbenzotriazole 0.5%, balance water;

[0096] Furthermore, the heat-responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is preferably prepared according to the following method:

[0097] Dissolve the refrigerated polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in a portion of water, stir well, and let stand overnight to allow it to fully dissolve, thus obtaining the first solution;

[0098] The antibacterial agent and the corrosion inhibitor are mixed to obtain a first mixture; the first mixture is dissolved in a first solution to obtain a second solution;

[0099] The second solution and the co-solvent are mixed, and the remaining water is added to obtain a thermally responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer.

[0100] The present invention provides the application of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in foam fire extinguishing agents and a heat-responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. The present invention applies polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer to foam fire extinguishing agents, resulting in a heat-responsive gel foam fire extinguishing agent with specific components and formulation based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. This fire extinguishing agent exhibits heat response capability and excellent fire extinguishing performance.

[0101] The heat-responsive gel foam extinguishing agent provided by this invention exhibits good flowability and foaming properties at room temperature. Once the temperature reaches the critical gelation temperature of the foam solution, the flowing foam rapidly transforms into gel foam in situ, significantly improving the foam's stability. It can be widely used for Class A and B fires and other fires.

[0102] The foam produced by this invention exhibits good flowability and foaming properties at room temperature. When applied to the surface of hot fuel, the flowing foam transforms into a high-viscosity gel foam, giving it excellent sealing and anti-reignition properties. After the fire is extinguished, the temperature drops, and the highly stable foam reversibly transforms into a less stable flowing foam, facilitating on-site cleanup. This extinguishing agent has low irritation to humans, excellent foaming and stability properties, and uses environmentally friendly and easily biodegradable raw materials, causing no environmental pollution. It can be widely used to extinguish Class A and Class B fires. In particular, the highly stable gel foam formed during fire extinguishing exhibits excellent anti-reignition properties.

[0103] Experimental results show that the surface tension of the extinguishing agent provided by this invention is 35-40 mN / m; the foaming ratio is 1-20; the half-life at room temperature (20℃) is less than 86 min, and the half-life at 45℃ can be greater than 48 hours; the extinguishing time is 50-100 s; and the anti-burning time can reach up to 21 min.

[0104] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, illustrates the application of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer provided by the present invention in foam fire extinguishing agents and a foam fire extinguishing agent. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0105] Example 1

[0106] (1) Add 3kg of water to the reactor, turn on the stirring and stir at 700r / min. Weigh 80g of polyether F127 and slowly add it to the reactor.

[0107] (2) After the sample is dissolved, weigh 2g of sodium diacetate and 2g of methylbenzotriazole, mix them evenly and add them to the reaction vessel, and stir thoroughly.

[0108] (3) Weigh 120g of dihydroxydiethylbutyl ether and 120g of 1,2-ethylene glycol again, mix them evenly and slowly add them to the reaction vessel, add water to 4kg, and continue stirring for 2 hours to obtain the product, which can be used for fire extinguishing.

[0109] Example 2

[0110] (1) Add 3kg of water to the reactor, turn on the stirring and stir at a speed of 700r / min. Weigh 200g of polyether F127 and slowly add it to the reactor.

[0111] (2) After the sample is dissolved, weigh 2g of sodium diacetate and 2g of methylbenzotriazole, mix them evenly and add them to the reaction vessel, and stir thoroughly.

[0112] (3) Weigh 120g of dihydroxydiethylbutyl ether and 120g of 1,2-ethylene glycol again, mix them evenly and slowly add them to the reaction vessel, add water to 4kg, and continue stirring for 2 hours to obtain the product, which can be used for fire extinguishing.

[0113] Example 3

[0114] (1) Add 3kg of water to the reactor, turn on the stirring and stir at a speed of 700r / min. Weigh 800g of polyether F127 and slowly add it to the reactor.

[0115] (2) After the sample is dissolved, weigh 2g of sodium diacetate and 2g of methylbenzotriazole, mix them evenly and add them to the reaction vessel, and stir thoroughly.

[0116] (3) Weigh 120g of dihydroxydiethylbutyl ether and 120g of 1,2-ethylene glycol again, mix them evenly and slowly add them to the reaction vessel, add water to 4kg, and continue stirring for 2 hours to obtain the product, which can be used for fire extinguishing.

[0117] The product of the present invention was self-tested, and the specific test results are shown in Table 1 below. Table 1 shows the performance test results of the fire extinguishing agents prepared in Examples 1 to 3 of the present invention.

[0118] Table 1 Performance results of the fire extinguishing agents prepared in Examples 1-3 of this invention

[0119]

[0120]

[0121] As can be seen from the above embodiments, the thermally responsive gel foam fire extinguishing agent based on polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer provided by the present invention produces foam with good flowability, foaming performance, sealing performance, and anti-reignition performance. After the fire is extinguished, the temperature drops, and the highly stable foam reversibly transforms into a less stable flowing foam, which is convenient for on-site cleanup. Moreover, the raw materials of this fire extinguishing agent are all environmentally friendly and easily biodegradable, and will not cause environmental pollution.

[0122] The present invention provides a detailed description of a thermally responsive gel foam fire extinguishing agent based on a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the invention, including the best mode, and to enable any person skilled in the art to practice the invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this invention is defined by the claims and may include other embodiments conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A heat-responsive gel foam fire extinguishing agent, characterized in that, It consists of the following components by weight percentage: The cosolvent includes diethyl butyl ether and / or 1,2-ethylidene glycol; The antibacterial agent includes one or more of sodium diacetate, sodium benzoate, 2-phenylphenol, and potassium sorbate; The corrosion inhibitors include benzotriazole and / or methylbenzotriazole.

2. The foam extinguishing agent according to claim 1, characterized in that, The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer has the structure shown in formula (I): Where x = 2 to 130, y = 15 to 67.

3. The foam extinguishing agent according to claim 1, characterized in that, The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer includes polyether F127.

4. The foam extinguishing agent according to claim 1, characterized in that, The preparation method of the foam fire extinguishing agent includes the following steps: 1) A foam fire extinguishing agent is obtained by mixing polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

5. The foam extinguishing agent according to claim 4, characterized in that, Step 1) specifically includes the following steps: 11) Premix the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer with water to obtain the first solution; After mixing the antibacterial agent and the corrosion inhibitor, a first mixture is obtained; 12) After further mixing the first mixture and the first solution obtained in the above steps, a second solution is obtained; 13) After mixing the second solution obtained in the above steps with the co-solvent, add water and mix again to obtain the foam extinguishing agent.

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