A thermally responsive gel foam fire extinguishing agent based on cellulose ether

Abstract

This invention provides the application of cellulose ethers in foam fire extinguishing agents. This invention also provides a foam fire extinguishing agent, which is a heat-responsive gel foam fire extinguishing agent based on cellulose ethers, exhibiting excellent anti-reignition and heat-responsive properties. The foam fire extinguishing agent provided by this invention uses cellulose ethers as its main raw material, a natural polymer material that is harmless to the environment and human health. The remaining raw materials are environmentally friendly and easily biodegradable, causing no environmental pollution. It is a clean, efficient, environmentally friendly, fluorine-free foam fire extinguishing agent. When its foam is applied to the surface of hot fuel, it undergoes a heat response, transforming from flowable foam into a highly stable, high-viscosity gel foam, which gives it excellent sealing and anti-reignition properties.

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 cellulose ethers in foam fire extinguishing agents and a foam fire extinguishing agent, particularly a thermally responsive gel foam fire extinguishing agent based on cellulose ethers. Background Technology

[0002] Fluorocarbon surfactants, a key component of aqueous film-forming foam (AFFF), effectively reduce surface tension, enabling the formation of a water film on hydrocarbon fuel surfaces for excellent fire extinguishing performance. AFFF is considered the gold standard for extinguishing oil pool fires. However, the key substance used in the production of AFFF—perfluorooctane sulfonic acid (PFOS) and its salts—has been shown to be bioaccumulative, biodegradable, and toxic due to the extreme stability of the carbon-fluorine bonds at the tail of its chemical structure. After fire suppression, residual AFFF can seep into the soil, causing serious groundwater pollution.

[0003] Most existing fluorine-free foam fire extinguishing agents use hydrocarbon surfactants as foaming agents because they are inexpensive and have good foaming properties. Unlike oleophobic fluorocarbon surfactants, the hydrocarbon chains of hydrocarbon surfactants are lipophilic. These hydrocarbon chains can attract fuel molecules through induced dipole interactions, based on the principle of "like dissolves like." Once fluorocarbon surfactants are removed from the formulation, fuel vapors can easily penetrate the foam layer. Therefore, existing fluorine-free foam fire extinguishing agents generally suffer from poor foam stability and insufficient fire resistance. Currently, there is no fluorine-free foam fire extinguishing agent with overall performance superior to AFFF (Alternating Current Fluorine-Free Foam).

[0004] Therefore, developing a highly efficient and clean foam fire extinguishing agent that does not contain fluorocarbon surfactants and solving the aforementioned problems of current fluorocarbon-free foam fire extinguishing agents is of great significance for fire safety and environmental health, and is also one of the focuses of widespread attention among 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 cellulose ether in foam fire extinguishing agents and a foam fire extinguishing agent, especially a heat-responsive gel foam fire extinguishing agent based on cellulose ether. The foam fire extinguishing agent provided by the present invention is a heat-responsive, fluorine-free, environmentally friendly foam fire extinguishing agent with excellent anti-reignition performance and excellent anti-reignition performance and heat response performance.

[0006] This invention provides the application of cellulose ethers in foam fire extinguishing agents.

[0007] Preferably, the cellulose ether comprises methylcellulose and / or hydroxypropyl methylcellulose;

[0008] The cellulose ether has a mass content of 0.1% to 10% in the foam extinguishing agent.

[0009] Preferably, the application is specifically a combination of cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer;

[0010] The foam extinguishing agent includes a heat-responsive gel foam extinguishing agent.

[0011] Preferably, the mass content of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the foam extinguishing agent is 0.1% to 5%;

[0012] The foam extinguishing agent is a fluorine-free foam extinguishing agent.

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

[0014] Cellulose ethers: 0.1%–10%;

[0015] Polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer 0.1% to 5%;

[0016] Cosolvent 1%–15%;

[0017] Antibacterial agent 0.01%–0.6%;

[0018] Corrosion inhibitor 0.1%–1%;

[0019] The remaining water.

[0020] Preferably, the cellulose ether comprises methylcellulose and / or hydroxypropyl methylcellulose;

[0021] The cosolvent includes one or more of diethyl butyl ether, ethylene glycol, glycerol, and propylene glycol.

[0022] Preferably, the antibacterial agent includes one or more of sodium diacetate, sodium benzoate, and 2-phenylphenol;

[0023] The corrosion inhibitor includes methylbenzotriazole.

[0024] Preferably, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer includes poloxamer 407;

[0025] The foam extinguishing agent includes a heat-responsive gel foam extinguishing agent.

[0026] Preferably, the preparation method of the foam fire extinguishing agent includes the following steps:

[0027] 1) A foam fire extinguishing agent is obtained by mixing cellulose ether, polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

[0028] Preferably, step 1) specifically includes the following steps:

[0029] 11) Mix cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer to obtain a first mixture, then add a cosolvent, mix again to obtain a second mixture, and then add water to obtain a first solution;

[0030] After mixing the antibacterial agent and the corrosion inhibitor, a third mixture is obtained;

[0031] 12) After further mixing the third mixture obtained in the above steps with the first solution, a second solution is obtained;

[0032] 13) After mixing the second solution obtained in the above steps with water, foam fire extinguishing agent is obtained.

[0033] This invention provides the application of cellulose ethers in foam fire extinguishing agents. Compared with the prior art, this invention creatively applies cellulose ethers to foam fire extinguishing agents, and further combines them with polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymers, resulting in a heat-responsive gel foam fire extinguishing agent based on cellulose ethers with specific components and formulation. This fire extinguishing agent exhibits excellent anti-reignition performance and thermal response performance.

[0034] The foam fire extinguishing agent provided by this invention uses cellulose ether as its main raw material, which is a natural polymer material that is harmless to the environment and human health. The other raw materials are environmentally friendly and easily biodegradable, and will not cause environmental pollution. It is a clean, efficient, environmentally friendly, fluorine-free foam fire extinguishing agent. When the foam is applied to the surface of hot fuel, it undergoes a thermal response, and the flowable foam is transformed into a highly stable, high-viscosity gel foam, which gives it good sealing and anti-reignition properties.

[0035] Experimental results show that the extinguishing agent provided by this invention has a surface tension of 35-40 mN / m, a pH value of 7.0-8.0, no precipitates, a foaming ratio of 1-20, and an anti-burning time of more than 15 min. It is a thermally responsive, fluorine-free, environmentally friendly foam extinguishing agent with excellent anti-reignition performance. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] This invention provides the application of cellulose ethers in foam fire extinguishing agents.

[0040] In this invention, the cellulose ether preferably includes methylcellulose and / or hydroxypropyl methylcellulose, more preferably methylcellulose or hydroxypropyl methylcellulose.

[0041] In this invention, the application is preferably a combination of cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer.

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

[0043]

[0044] Wherein, x = 2 to 130, y = 15 to 67, preferably x = 30 to 100, y = 25 to 57, and more preferably x = 60 to 70, y = 45 to 47.

[0045] In this invention, the mass content of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the foam fire extinguishing agent is preferably 0.1% to 5%, can be 0.5% to 5%, and is preferably 1% to 4%.

[0046] In this invention, the cellulose ether in the foam extinguishing agent is preferably 0.1% to 10% by mass, more preferably 0.1% to 8%, and even more preferably 0.5% to 5%.

[0047] In this invention, the foam extinguishing agent preferably includes a heat-responsive gel foam extinguishing agent.

[0048] In this invention, the foam extinguishing agent is preferably a fluorine-free foam extinguishing agent.

[0049] This invention provides a foam fire extinguishing agent, comprising, by weight percentage:

[0050] Cellulose ethers: 0.1%–10%;

[0051] Polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer 0.1% to 5%;

[0052] Cosolvent 1%–15%;

[0053] Antibacterial agent 0.01%–0.6%;

[0054] Corrosion inhibitor 0.1%–1%;

[0055] The remaining water.

[0056] In this invention, the amount of cellulose ether added is 0.1% to 10%, more preferably 0.1% to 8%, and even more preferably 0.5% to 5%.

[0057] In this invention, the amount of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer added is 0.1% to 5%, which can be 0.5% to 5%, preferably 1% to 4%.

[0058] In this invention, the amount of the co-solvent added is 1% to 15%, which can be 3% to 13%, and preferably 5% to 10%.

[0059] In this invention, the amount of the antibacterial agent added is 0.01% to 0.6%, which can be 0.1% to 0.5%, and preferably 0.2% to 0.4%.

[0060] In this invention, the amount of corrosion inhibitor added is 0.1% to 1%, which can be 0.1% to 0.8%, preferably 0.2% to 0.5%.

[0061] In this invention, the cellulose ether preferably includes methylcellulose and / or hydroxypropyl methylcellulose, more preferably methylcellulose or hydroxypropyl methylcellulose.

[0062] In this invention, the cosolvent preferably includes one or more of diethyl butyl ether, ethylene glycol, glycerol and propylene glycol, more preferably diethyl butyl ether, ethylene glycol, glycerol or propylene glycol.

[0063] In this invention, the antibacterial agent preferably includes one or more of sodium diacetate, sodium benzoate, and 2-phenylphenol, more preferably sodium diacetate, sodium benzoate, or 2-phenylphenol.

[0064] In this invention, the corrosion inhibitor preferably includes methylbenzotriazole.

[0065] In this invention, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer preferably includes poloxamer 407.

[0066] In this invention, the foam extinguishing agent preferably includes a heat-responsive gel foam extinguishing agent.

[0067] In this invention, the foam extinguishing agent is preferably a fluorine-free foam extinguishing agent.

[0068] In this invention, the preparation method of the foam fire extinguishing agent preferably includes the following steps:

[0069] 1) A foam fire extinguishing agent is obtained by mixing cellulose ether, polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

[0070] In this invention, step 1) preferably includes the following steps:

[0071] 11) Mix cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer to obtain a first mixture, then add a cosolvent, mix again to obtain a second mixture, and then add water to obtain a first solution;

[0072] After mixing the antibacterial agent and the corrosion inhibitor, a third mixture is obtained;

[0073] 12) After further mixing the third mixture obtained in the above steps with the first solution, a second solution is obtained;

[0074] 13) After mixing the second solution obtained in the above steps with water, foam fire extinguishing agent is obtained.

[0075] To complete and refine the overall technical solution, better ensure the composition and proportion of foam extinguishing agents, and further improve the anti-reignition performance and thermal response performance of foam extinguishing agents, the above-mentioned cellulose ether-based thermal response gel foam extinguishing agent may specifically include the following:

[0076] A cellulose ether-based heat-responsive gel foam fire extinguishing agent comprises the following components by weight percentage:

[0077] Cellulose ether 0.1-10%, polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer 0.1-5%, cosolvent 1-15%, antibacterial agent 0.01-0.6%, corrosion inhibitor 0.1-1%, balance water.

[0078] Specifically, the cellulose ether is selected from methylcellulose and / or hydroxypropyl methylcellulose.

[0079] Specifically, the structural formula of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is as follows:

[0080]

[0081] Where x = 2 to 130, y = 15 to 67.

[0082] Specifically, the cosolvent is selected from one or more of diethyl butyl ether, ethylene glycol, glycerol, and propylene glycol;

[0083] The antibacterial agent is one or more of sodium diacetate, sodium benzoate, and 2-phenylphenol;

[0084] The corrosion inhibitor is methylbenzotriazole.

[0085] Specifically, the extinguishing agent includes 0.1-10% cellulose ether and 0.1-5% polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer.

[0086] Furthermore, the fire extinguishing agent provided by the present invention comprises 0.1-10% cellulose ether, preferably 0.1-5%. The cellulose ether is the source of the thermal response performance of the present invention, and is preferably methylcellulose. In a specific embodiment, the cellulose ether accounts for 0.5% of the weight percentage of the fire extinguishing agent.

[0087] Furthermore, the fire extinguishing agent provided by the present invention comprises 0.1-5% (preferably 1-5%) of a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer. The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer is preferably poloxamer 407. In specific embodiments, the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer accounts for 1%, 2%, or 5% of the weight percentage of the fire extinguishing agent.

[0088] Furthermore, the fire extinguishing agent provided by the present invention includes 1-15% of a co-solvent, preferably 5-10%. The co-solvent is preferably diethyl butyl ether. In a specific embodiment, the co-solvent accounts for 8% of the weight percentage of the fire extinguishing agent.

[0089] Furthermore, the fire extinguishing agent provided by the present invention includes 0.01-0.6% of a bacteriostatic agent, preferably 0.1-0.5%. The bacteriostatic agent is preferably 2-phenylphenol. In a specific embodiment, the bacteriostatic agent accounts for 0.3% of the weight percentage of the fire extinguishing agent.

[0090] Furthermore, the fire extinguishing agent provided by the present invention includes 0.1-1% corrosion inhibitor, preferably 0.1-0.5%. The corrosion inhibitor is preferably methylbenzotriazole. In a specific embodiment, the corrosion inhibitor accounts for 0.3% 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, in this invention, the extinguishing agent is preferably composed of the following raw materials:

[0093] Methylcellulose 0.5%, poloxamer 407 1%, diethyl butyl ether 8%, 2-phenylphenol 0.3%, methylbenzotriazole 0.3%, balance water;

[0094] Or, 0.5% methylcellulose, 2% poloxamer 407, 8% diethyl butyl ether, 0.3% 2-phenylphenol, 0.3% methylbenzotriazole, with the balance being water;

[0095] Or, 0.5% methylcellulose, 5% poloxamer 407, 8% diethyl butyl ether, 0.3% 2-phenylphenol, 0.3% methylbenzotriazole, with the balance being water;

[0096] Furthermore, the cellulose ether-based thermally responsive gel foam fire extinguishing agent is preferably prepared according to the following method:

[0097] Cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer are mixed to obtain a first mixture; the first mixture is dispersed in a cosolvent and stirred evenly to obtain a second mixture;

[0098] The second mixture was dissolved in a portion of water and stirred until homogeneous to obtain the first solution;

[0099] The antibacterial agent and the corrosion inhibitor are mixed to obtain a third mixture; the third mixture is dissolved in the first solution to obtain a second solution;

[0100] The second solution was stirred until homogeneous, and then the remaining water was added to obtain a cellulose ether-based thermally responsive gel foam fire extinguishing agent.

[0101] The present invention provides the application of cellulose ethers in foam fire extinguishing agents and a heat-responsive gel foam fire extinguishing agent based on cellulose ethers. The present invention applies cellulose ethers to foam fire extinguishing agents, and further combines this with a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, resulting in a heat-responsive gel foam fire extinguishing agent based on cellulose ethers with specific components and formulation. This fire extinguishing agent exhibits excellent anti-reignition properties and heat response performance.

[0102] The foam fire extinguishing agent provided by this invention uses cellulose ether as its main raw material, which is a natural polymer material that is harmless to the environment and human health. The other raw materials are environmentally friendly and easily biodegradable, and will not cause environmental pollution. It is a clean, efficient, environmentally friendly, fluorine-free foam fire extinguishing agent. When the foam is applied to the surface of hot fuel, it undergoes a thermal response, and the flowable foam is transformed into a highly stable, high-viscosity gel foam, which gives it good sealing and anti-reignition properties.

[0103] Experimental results show that the extinguishing agent provided by this invention has a surface tension of 35-40 mN / m, a pH value of 7.0-8.0, no precipitates, a foaming ratio of 1-20, and an anti-burning time of more than 15 min. It is a thermally responsive, fluorine-free, environmentally friendly foam extinguishing agent with excellent anti-reignition performance.

[0104] To further illustrate the present invention, the following detailed description of the application of the cellulose ether provided by the present invention in foam fire extinguishing agents and a foam fire extinguishing agent is provided in conjunction with the embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given only to further illustrate 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) Weigh 20g of methylcellulose and 40g of poloxamer 407, disperse them in 320g of diethyl butyl ether, and mix them evenly;

[0107] (2) Add 3kg of water to the reactor and start stirring at a speed of 700r / min.

[0108] (3) After the sample is dissolved, weigh 1.2g of 2-phenylphenol and 2g of methylbenzotriazole, mix them evenly and add them to the reaction vessel, and stir thoroughly.

[0109] (4) Add water to 4kg and continue stirring for 2 hours to obtain the product, which can be used for fire extinguishing.

[0110] Example 2

[0111] (1) Weigh 20g of methylcellulose and 80g of poloxamer 407, disperse them in 320g of diethyl butyl ether, and mix them evenly;

[0112] (2) Add 3kg of water to the reactor and start stirring at a speed of 700r / min.

[0113] (3) After the sample is dissolved, weigh 1.2g of 2-phenylphenol and 2g of methylbenzotriazole, mix them evenly and add them to the reaction vessel, and stir thoroughly.

[0114] (4) Add water to 4kg and continue stirring for 2 hours to obtain the product, which can be used for fire extinguishing.

[0115] The specific test results of the self-inspection of the product of the present invention are shown in Table 1 below. Table 1 shows the performance test results of the fire extinguishing agents prepared in Examples 1 and 2 of the present invention.

[0116] Table 1

[0117]

[0118] As can be seen from the above embodiments, the foam produced by this invention undergoes a thermal response when applied to the surface of hot fuel: the flowing foam transforms into a highly stable, high-viscosity gel foam, which gives it excellent sealing and anti-reignition properties. The main raw material, cellulose ether, is a natural polymer material that is harmless to the environment and human health. The remaining raw materials are all environmentally friendly and easily biodegradable, and will not cause environmental pollution. It is a clean, efficient, environmentally friendly, fluorine-free foam fire extinguishing agent.

[0119] The foregoing has provided a detailed description of a cellulose ether-based thermally responsive gel foam fire extinguishing agent provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also 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 for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. Application of cellulose ethers and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymers in thermally responsive gel foam fire extinguishing agents; The cellulose ether includes methylcellulose and / or hydroxypropyl methylcellulose; The cellulose ether has a mass content of 0.1% to 10% in the foam extinguishing agent; The mass content of the polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer in the foam extinguishing agent is 0.1%~5%; The foam extinguishing agent is a fluorine-free foam extinguishing agent; The applications also include cosolvents, antibacterial agents, and corrosion inhibitors.

2. A heat-responsive gel foam fire extinguishing agent, characterized in that, By weight percentage, including: Cellulose ethers 0.1%~10%; Polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer 0.1%~5%; Cosolvent 1%~15%; Antibacterial agent 0.01%~0.6%; Corrosion inhibitor 0.1%~1%; The remaining water.

3. The thermally responsive gel foam fire extinguishing agent according to claim 2, characterized in that, The cellulose ethers include methylcellulose and / or hydroxypropyl methylcellulose.

4. The thermally responsive gel foam fire extinguishing agent according to claim 2, characterized in that, The cosolvent includes one or more of diethyl butyl ether, ethylene glycol, glycerol, and propylene glycol.

5. The thermally responsive gel foam fire extinguishing agent according to claim 2, characterized in that, The antibacterial agent includes one or more of sodium diacetate, sodium benzoate, and 2-phenylphenol.

6. The thermally responsive gel foam fire extinguishing agent according to claim 2, characterized in that, The corrosion inhibitor includes methylbenzotriazole.

7. The thermally responsive gel foam fire extinguishing agent according to claim 2, characterized in that, The polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer includes poloxamer 407.

8. The thermally responsive gel foam fire extinguishing agent according to claim 2, 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 cellulose ether, polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, cosolvent, antibacterial agent, corrosion inhibitor and water.

9. The thermally responsive gel foam fire extinguishing agent according to claim 8, characterized in that, Step 1) specifically includes the following steps: 11) A first mixture is obtained by mixing cellulose ether and polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, then a cosolvent is added and the mixture is mixed again to obtain a second mixture, and then water is added to obtain a first solution. After mixing the antibacterial agent and the corrosion inhibitor, a third mixture is obtained; 12) After further mixing the third mixture obtained in the above steps with the first solution, a second solution is obtained; 13) After mixing the second solution obtained in the above steps with water, foam fire extinguishing agent is obtained.

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