Seawater-resistant bio-based hydrocarbon foaming agent for fire fighting

Abstract

The invention discloses a seawater-resistant bio-based hydrocarbon foaming agent for fire fighting. The seawater-resistant bio-based hydrocarbon foaming agent comprises the following components in parts by mass: 40-60 parts of a bio-based chelating surfactant; 15 to 50 parts of a bio-based nonionic surfactant; 5 to 15 parts of an amino acid surfactant; 0.02 to 1 part of a foam stabilizer; 0.1 to 1 part of a flame retardant; 0.5 to 5 parts of an anti-freezing agent; and 70 to 120 ppm of a flue gas inhibitor. The fire extinguishing agent is prepared by compounding the bio-based surfactant, the foam stabilizer, the flame retardant, the anti-freezing agent and the like, has a very strong synergistic effect, strong salt tolerance and excellent foam performance, spreading performance and sealing performance, so that good fire extinguishing performance is achieved, and the fire extinguishing agent is green, environmentally friendly and free of environmental pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of green chemistry, in particular to a safe, efficient and green new seawater-resistant bio-based hydrocarbon foaming agent required for an aqueous film-forming foam fire extinguishing agent. Background Art

[0002] Fire is considered to be the most frequent and destructive disaster among all kinds of disasters in human society. Among them, flammable liquid fires are difficult to extinguish due to their high calorific value, fast burning speed, fluidity and splashing. Their combustion products are complex and usually contain a large amount of toxic and harmful substances, which seriously threaten human production and life. Therefore, clean and efficient liquid fire extinguishing technology has always been the focus of international attention. At present, the principles of liquid fire extinguishing technology are diverse, such as gas fire extinguishing technology such as carbon dioxide, inert gas and "halon" series fire extinguishing agents, liquid fire extinguishing technology such as water spray and fine water mist, and solid phase fire extinguishing technology such as dry powder and aerosol. These fire extinguishing technologies have relatively few scenarios in which they can be effectively used to extinguish liquid fires due to their high requirements for the fire extinguishing system and their own limited fire extinguishing efficiency. After more than half a century of development, foam fire extinguishing agents have been proven to be the most common and effective method for extinguishing flammable liquid fires, especially large-scale open-air flammable liquid fires, such as aircraft carrier deck fires, airport fuel leak fires, offshore oil and gas drilling platform fires, and liquid fuel leak fires in oil tank areas. Foam is considered to be the only efficient fire extinguishing technology. According to the different foaming multiples, it can be divided into low, medium and high multiple foam fire extinguishing agents; according to the different foaming bases, it can be divided into protein-type and synthetic foam fire extinguishing agents; according to the different functions and application sites, it can be divided into anti-solvent type, seawater resistant type, etc. Among the numerous foam extinguishing agent products, low-multiple aqueous film-forming foam extinguishing agent (AFFF, composed of fluorocarbon surfactants, hydrocarbon surfactants and additives to improve foam performance (such as foam stabilizers, antifreeze agents, co-solvents, thickeners, etc. and water) has become the most effective fire-fighting technology for large-scale open-air flammable liquid fires due to its high fire-fighting efficiency. However, with the promotion and use of AFFF worldwide, people have gradually discovered that its core component, the fluorocarbon surfactant, has serious environmental problems. The branched or linear perfluorooctane carboxylates and perfluorooctane sulfonate surfactants produced by electrolysis or tetrafluoroethylene polymerization are extremely stable in the environment, difficult to hydrolyze, and cannot be biodegraded, but can actively bioaccumulate and migrate in the food chain. These substances are in food. The long-term existence of AFFF in the food chain will pose a great threat to the survival of animals and plants in the environment. In April 2009, the United Nations Environment Program (EPA) passed the Stockholm Convention on Persistent Organic Pollutants (POPs), which listed nine major substances such as perfluorooctane sulfonic acid (PFOS) and its salts contained in AFFF as persistent organic pollutants (POPs), and strictly restricted the use of PFOS and its derivatives. This also had a huge impact on the AFFF market, resulting in a great impact on the use of traditional AFFF internationally. The development of alternative technologies for traditional AFFF extinguishing agents or new, efficient and environmentally friendly flammable liquid fire extinguishing technologies is an urgent problem for current scientific researchers. Effectively reducing the emission of persistent organic matter PFOS is of great significance to ecological environmental protection.The research on its substitutes is currently focused on the development of fluorine-free foam fire extinguishing agents or foam fire extinguishing agents containing short-chain fluorocarbon surfactants. However, the foam performance and spreading performance are generally poor.

[0003] Therefore, the development of green and environmentally friendly hydrocarbon foaming agents is an important factor in improving the performance of foam fire extinguishing agents and is the key to promoting the efficient application of fluorine-free or short-chain fluorocarbon surfactants in foam fire extinguishing agents. For fires in offshore operations and transportation and high-mineralization mine fires, the water contains a large amount of strong electrolytes, such as sodium chloride, magnesium chloride, sodium sulfate, etc. When mixed with conventional foaming agents, the resulting foam system is loose, which will accelerate the foam bursting. Therefore, it is urgent to develop water-based film-forming foaming agents that can adapt to more complex sea surfaces and fire conditions with high mineralization. Summary of the invention

[0004] The object of the present invention is to provide a seawater-resistant bio-based hydrocarbon foaming agent for fire fighting to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a seawater-resistant bio-based hydrocarbon foaming agent for firefighting, comprising the following main components and mass fractions:

[0006] 40-60 parts of bio-based chelating surfactant

[0007] 15-50 parts of bio-based nonionic surfactant

[0008] Amino acid surfactant 5-15 parts

[0009] Foam stabilizer 0.02-1 part

[0010] Flame retardant 0.1-1 part

[0011] Antifreeze 0.5-5 parts

[0012] Smoke suppressant 70-120ppm

[0013] Preferably, the seawater-resistant bio-based hydrocarbon foaming agent for firefighting comprises the following main components and their mass fractions:

[0014] 50-60 parts of bio-based chelating surfactant

[0015] 15-30 parts of bio-based nonionic surfactant

[0016] Amino acid surfactant 5-10 parts

[0017] Foam stabilizer 0.02-1 part

[0018] Flame retardant 0.1-1 part

[0019] 1-5 parts antifreeze

[0020] Smoke suppressant 90-120ppm

[0021] Preferably, the seawater-resistant bio-based hydrocarbon foaming agent for firefighting comprises the following main components and their mass fractions:

[0022] 40-50 parts of bio-based chelating surfactant

[0023] 20-50 parts of bio-based nonionic surfactant

[0024] Amino acid surfactant 5-10 parts

[0025] Foam stabilizer 0.02-1 part

[0026] Flame retardant 0.1-1 part

[0027] 3-5 parts antifreeze

[0028] Smoke suppressant 80-100ppm

[0029] Preferably, the bio-based high chelating surfactant is alkyl glycoside citrate monoester salt (APG-EC) or alcohol ether glycoside citrate monoester salt (AEG-EC).

[0030] Preferably, the alkyl glycoside citric acid monoester salt (APG-EC) or alcohol ether glycoside citric acid monoester salt (AEG-EC) is prepared from alkyl glycoside and citric acid or citric anhydride.

[0031] In addition to all the characteristics of alkyl glycosides and alcohol ether glycosides, it also has the ability to chelate metal ions and has good environmental compatibility. This makes the product highly salt-resistant and surface-active. At the same time, the polyhydroxy structure of alkyl glycosides has strong corrosion resistance and can react with metal ions to form stable complexes, thereby inhibiting the oxidation of metal ions and slowing down the corrosion process.

[0032] Preferably, the bio-based nonionic surfactant is one of alkyl polyglycoside APG0810, APG10, alcohol ether polyglycoside AEG050, etc. or a compound thereof. After compounding, the surface activity of the system can be significantly improved.

[0033] Preferably, the amino acid surfactant is one of sodium lauroyl sarcosinate (CS-30S), disodium cocoyl glutamate (CG-30S) and sodium cocoyl glycinate (GC-30S) or a combination thereof. After compounding, the foam performance of the system can be significantly improved.

[0034] Preferably, the foam stabilizer is one of xanthan gum, sodium alginate (SA) and sodium carboxymethyl cellulose (CMC).

[0035] The addition of a foam stabilizer can form a more stable liquid film on the foam wall, prevent the foam from breaking, thereby extending the life cycle of the foam, increasing the foam coverage area, and at the same time reducing the surface tension of water, improving permeability, and preventing the liquid in the foam from evaporating, shrinking, and flowing excessively, maintaining the foam in a stable non-equilibrium state, accelerating the foam's penetration into the deep part of the fire scene, expanding the fire extinguishing range, and enhancing the fire extinguishing performance of the foam. When xanthan gum, sodium alginate (SA), sodium carboxymethyl cellulose (CMC), etc. are added to the solution, the aqueous film-forming foam film has a relatively high viscosity, improving the stability and durability of the foam, as well as reducing the gas permeability of the foam film and the water film, making it more difficult for fuel vapor to penetrate the foam film or the water film, preventing the drainage process, thereby extending the foam life, improving the stability and sealing of the foam film and the water film, and achieving a better fire extinguishing effect. However, the concentration of such macromolecular substances added cannot be too high, as excessive concentration will affect the normal release of the fire extinguishing agent by the foam generator.

[0036] Preferably, the flame retardant is urea.

[0037] Preferably, the antifreeze is ethylene glycol or propylene glycol, which can effectively reduce the freezing point of the liquid, thereby preventing the liquid from freezing and expanding in a low-temperature environment, achieving the antifreeze effect. This expands the scope of use of the product.

[0038] Preferably, the smoke inhibitor is ferrocene. It has a very strong smoke-inhibiting effect. Research shows that its optimal concentration is 70 - 120 ppm, and after dissolving ferrocene in an organic solvent, it can stably exist in the foaming system of the present invention in the form of a microemulsion.

[0039] Compared with the prior art, the present invention is composed of a bio-based surfactant, a foam stabilizer, a flame retardant, an antifreeze, etc. through compounding, has a strong synergistic effect, strong salt tolerance, excellent foam performance, spreading performance, and sealing performance, thereby achieving good fire extinguishing performance, and is green and environmentally friendly, without polluting the environment.

[0040] 1) The seawater-resistant hydrocarbon foam agent of the present invention uses a bio-based surfactant compounding system as the main foaming component. Alkyl polyglycoside citrate or alcohol ether glycoside citrate not only has good foaming power, but also has the ability to chelate metal ions, and at the same time has good environmental compatibility. This makes the product have high salt tolerance and surface activity. At the same time, the polyhydroxy structure of alkyl polyglycoside has strong corrosion resistance, can undergo a complexation reaction with metal ions to form a stable complex, thereby inhibiting the oxidation of metal ions and slowing down the corrosion process.

[0041] The compounding of alkyl glycoside or alcohol ether glycoside and amino acid surfactant with outstanding foaming performance makes this seawater-resistant bio-based hydrocarbon foaming system have lower surface tension, better foaming performance, more superior oil compatibility and compatibility with short-chain fluorocarbon or silicone surfactants, which can better form a layer of water film on the surface of various non-water-soluble flammable and flammable liquids to achieve the effect of fire extinguishing. It can be widely compounded with short-chain fluorocarbon surfactants or silicone surfactants as a water-forming foam fire extinguishing agent, and is widely used in the technical field of fire fighting.

[0042] (2) Compared with common hydrocarbon foam agents, the seawater-resistant hydrocarbon foam agent of the present invention has good flame retardancy and smoke suppression properties, making the fire extinguishing process more efficient.

[0043] (3) The seawater-resistant hydrocarbon foaming agent of the present invention is concentrated from a bio-based hydrocarbon surfactant, a foam stabilizer, an antifreeze agent, a flame retardant, a smoke suppressant, etc. It is easy to use and simple to operate, and is widely used in the technical field of fire fighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a main flow chart of the processing system of the present invention.

[0045] Figure 2 This is a process flow chart of the wastewater pretreatment system for the cleaning workshop of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Embodiment 1:

[0048] The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this embodiment is prepared by the following method: 50 parts of C12-14 alkyl glycoside citric acid monoester disodium salt APG-EC, 30 parts of C10 alkyl glycoside APG10, 14.77 parts of sodium lauroyl sarcosinate CS-30S, and 5 parts of propylene glycol are added in sequence to a reactor, and stirred until the system is completely transparent, the reactor is heated to 50°C, and 0.03 parts of xanthan gum, 0.2 parts of urea, and 100 ppm of ferrocene are added again, and stirred until the solution becomes a uniform, stable and clear solution, and the stirring is stopped to obtain a seawater-resistant hydrocarbon foaming agent for firefighting.

[0049] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0050] Embodiment 2:

[0051] The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this embodiment is prepared by the following method: 60 parts of C12-14 alcohol ether glycoside citric acid monoester disodium salt AEG-EC, 30 parts of C08-10 alkyl glycoside APG0810, 5 parts of sodium lauroyl sarcosinate CS-30S, and 4.45 parts of propylene glycol are added in a reactor in sequence, and stirred until the system is completely transparent, the reactor is heated to 50°C, and 0.05 parts of xanthan gum, 0.5 parts of urea, and 90 ppm of ferrocene are added again, and stirred until the solution becomes a uniform, stable and clear solution, and the stirring is stopped to obtain a seawater-resistant hydrocarbon foaming agent for firefighting.

[0052] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0053] Embodiment 3:

[0054] The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this embodiment is prepared by the following method: 40 parts of C12-14 alkyl glycoside citrate monoester disodium salt APG-EC, 50 parts of alcohol ether glycoside AEG, 5.5 parts of sodium lauroyl sarcosinate CS-30S, and 3 parts of propylene glycol are added in sequence to a reactor, and stirred until the system is completely transparent, the reactor is heated to 50°C, and 1 part of xanthan gum, 0.5 parts of urea, and 100 ppm of ferrocene are added again, and stirred until the solution becomes a uniform, stable and clear solution, and the stirring is stopped to obtain a seawater-resistant hydrocarbon foaming agent for firefighting.

[0055] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0056] Example 4 The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this example is prepared by the following method:

[0057] Add 60 parts of alcohol ether glycoside citric acid monoester disodium salt AEG-EC, 19.3 parts of C10 alkyl glycoside APG10, 15 parts of sodium lauroyl sarcosinate CS-30S, and 5 parts of propylene glycol to the reactor in sequence, stir until the system is completely transparent, heat the reactor to 50°C, add 0.2 parts of xanthan gum, 0.5 parts of urea, and 110 ppm of ferrocene again, stir until the solution becomes a uniform, stable, and clear solution, stop stirring, and obtain a seawater-resistant hydrocarbon foam agent for firefighting.

[0058] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0059] Example 5 The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this example is prepared by the following method:

[0060] In the reaction kettle, 60 parts of C12-14 alkyl glycoside citric acid monoester disodium salt APG-EC, 20 parts of C10 alkyl glycoside APG10, 15 parts of sodium lauroyl sarcosinate CS-30S, and 4.5 parts of propylene glycol were added in sequence, and stirred until the system was completely transparent. The temperature of the reaction kettle was raised to 50°C, and 0.3 parts of xanthan gum, 0.2 parts of urea, and 100 ppm of ferrocene were added again, and stirred until the solution became a uniform, stable, and clear solution. The stirring was stopped to obtain a seawater-resistant hydrocarbon foam agent for firefighting.

[0061] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0062] Example 6 The seawater-resistant bio-based hydrocarbon foaming agent for firefighting described in this example is prepared by the following method:

[0063] Add 55 parts of C12-14 alkyl glucoside citric acid monoester disodium salt APG-EC, 30 parts of C8-10 alkyl glucoside APG0810, 10 parts of sodium cocoyl glycinate GC-30S, and 2.77 parts of propylene glycol to the reactor in sequence, and stir until the system is completely transparent. Heat the reactor to 50°C, add 0.03 parts of xanthan gum, 0.2 parts of urea, and 100 ppm of ferrocene again, and stir until the solution becomes a uniform, stable, and clear solution. Stop stirring to obtain a seawater-resistant hydrocarbon foam agent for firefighting.

[0064] The mass unit used in this embodiment is gram, which may also be kilogram or other units; all raw materials described in this embodiment have been produced on a large scale.

[0065] To further illustrate the performance of the seawater-resistant bio-based hydrocarbon foaming agent developed by the present invention, samples were prepared according to the above-described embodiments, and the indexes and performance tests of the prepared samples were as follows:

[0066] Step 1: Determination of technical indicators of samples of Examples 1-6, and stability test: the samples were placed at 40°C, room temperature, and -10°C for one month, and no abnormalities were observed, as shown in Table 1;

[0067] Step 2: Determination of the surface tension of the samples of Examples 1-6, with reference to GB / T42415-2023 Determination of static surface tension of surfactants, the sample detection concentration is 1.5 g / L, see Table 1;

[0068] Step 3: Determination of the antifreeze property of the samples of Examples 1-6: Place the samples in a refrigerator at -20°C for 30 days, and there is no condensation in the samples;

[0069] Table 1 is the technical index test results of hydrocarbon foaming agents in Examples 1-6

[0070]

[0071] Step 4: Determination of foam properties of samples of Examples 1-6 and foam properties under seawater conditions. The preparation method of artificial seawater refers to GB15308-2006 foam fire extinguishing agent, that is, 25.0g sodium chloride (NaCl), 11.0g magnesium chloride hexahydrate (MgCl2·6H2O), 1.6g calcium chloride dihydrate (CaCl2·2H2O), and 4.0g sodium sulfate (Na2S04) are added to 1L of fresh water; the hydrocarbon foaming agent of the embodiment is prepared into a solution with a concentration of 0.5g / 100ml with this seawater. The foam performance determination method refers to the document "Laboratory Determination Method of Water Film-Forming Foam Fire Extinguishing Agent Performance" (Xiao Jinxin, Gao Zhan, Wang Minghao. Laboratory Determination Method of Water Film-Forming Foam Fire Extinguishing Agent Performance [J]. Chemical Research and Application, 2008, 20 (5): 569-572.). The results are shown in Table 2.

[0072] Table 2 is the test results of the hydrocarbon foaming agent foam and seawater resistance performance of Examples 1-6

[0073]

[0074] The data in the table are mean ± standard deviation (x ± S), and the number of experiments n = 3.

[0075] It can be seen that the foaming performance of the sample has no significant change under the conditions of distilled water and seawater, which reflects the excellent seawater resistance of the bio-based hydrocarbon foaming agent of the present invention.

[0076] Step 5; prepare an aqueous film-forming foam fire extinguishing agent (respectively denoted as Example 1F, Example 2F, etc.) with 6% hydrocarbon foaming agent prepared in the example, 0.7% short-chain fluorocarbon surfactant, and the rest being water. The fluorocarbon surfactant is selected from C6 fluorocarbon surfactant F1157 (the main component is polyfluoroalkyl betaine (PFAB), which is mainly composed of fluorocarbon surfactants with 6 carbon atoms fluorinated on the straight chain, DuPont Company, USA); separately prepare a fluorine-free aqueous film-forming foam fire extinguishing agent (respectively denoted as Example 1Si, Example 2Si, etc., the same below), 1% organosilicon surfactant, 7% hydrocarbon foaming agent prepared in the example, and the rest being water. The organosilicon surfactant is a polyether-modified organosiloxane organosilicon surfactant. Refer to steps 2 and 4 to test the surface tension and foam performance of the samples. The results are shown in Table 3

[0077] Table 3 is the performance test results of the aqueous film-forming foam fire extinguishing agent compounded with hydrocarbon foaming agents in Examples 1-6

[0078]

[0079] The data in the table are mean ± standard deviation (x ± S), and the number of experiments n = 3.

[0080] Step six: The water-based film-forming foam fire extinguishing agent prepared in step five is tested for its sealing and spreading properties on the rubber industry solvent oil at room temperature 22°C according to the method in step four. Sealing test: Place 30 mL of rubber industry solvent oil in a beaker with a diameter of 4 cm, use a syringe to drop 0.1 mL of water-based film-forming foam fire extinguishing agent onto the oil surface, pass an open flame at a height of 1 cm from the oil surface, and observe whether the oil is ignited. Record the time t that the oil can be ignited. The larger t is, the better the sealing performance of the water film on the oil surface. Spreading performance test: Place 100 mL of rubber industry solvent oil in a watch glass with a diameter of 14.5 cm, use a syringe (the needle diameter has been accurately measured) to drop the AFFF premix (no foam) onto the oil surface, and observe the spreading. The results are shown in Table 4

[0081] Table 4 is the test results of sealing and spreading performance of aqueous film-forming foam fire extinguishing agent compounded with hydrocarbon foaming agent in Examples 1-6

[0082]

[0083] The data in the table are mean ± standard deviation (x ± S), and the number of experiments n = 3.

[0084] Step seven: Test the fire extinguishing performance and burning time of the aqueous film-forming foam fire extinguishing agent prepared in step five of GB15308-2006, load the prepared aqueous film-forming foam liquid into the foam spray gun, and fully pressurize it so that it can be sprayed evenly. Pour the oil into a 32cm stainless steel oil pan, ignite it, and wait for the flame to spread to the entire surface of the oil. Immediately use the aqueous film-forming foam fire extinguishing agent and use a camera to record the time taken to extinguish the oil fire. Ensure the following conditions during the experiment: ambient temperature: (10-30)°C; foam temperature: (15-20)°C; fuel temperature: (10-30)°C; wind speed: no more than 3m / s (close to the oil pan); see the fire extinguishing experiment site Figure 1 shown.

[0085] The foam is injected into the oil pan, covering the entire oil surface to form a foam layer, which can effectively isolate the oil surface from the fire source. The fire-resistant tank in the foam is then ignited, causing the temperature to rise and reignite to test the fireproof performance of the foam layer. As the temperature of the fire-resistant tank continues to rise, the thickness of the foam layer gradually becomes thinner, but it can still cover the entire oil surface. However, as the fire-resistant tank continues to burn, the foam layer will continue to decrease, and there will be no foam coverage in some parts, the fire will continue to intensify, and ignite other parts at the same time. Finally, the foam layer is completely broken, the oil surface is completely reignited, and the fire-resistant experiment is over. See you at the fire-resistant experiment site Figure 2 , the results are shown in Table 5.

[0086] Table 5 is a table showing the fire extinguishing performance test results of the aqueous film-forming foam fire extinguishing agent compounded with hydrocarbon foaming agents in Examples 1-6

[0087]

[0088]

[0089] Step 7: Biodegradability, tested according to 15818-2006 "Test Method for Biodegradability of Surfactants", the results are shown in Table 6.

[0090] Table 6 is the test results of biodegradability of hydrocarbon foaming agents in Examples 1-6

[0091] sample Persistence and degradability Biodegradation Example 1 Easy to degrade 100% (27 days) Example 2 Easy to degrade 100% (27 days) Example 3 Easy to degrade 100% (27 days) Example 4 Easy to degrade 100% (27 days) Example 5 Easy to degrade 100% (27 days) Example 6 Easy to degrade 100% (27 days)

[0092] As can be seen from Table 6, the seawater-resistant bio-based hydrocarbon foaming agent developed in this embodiment is easily biodegradable and environmentally friendly.

[0093] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seawater-resistant bio-based hydrocarbon foaming agent for firefighting, characterized in that: Its composition and mass fraction are as follows: Bio-based chelating surfactant: 40-60 parts Bio-based nonionic surfactant: 15-50 parts Amino acid surfactant: 5-15 parts Foam stabilizer: 0.02-1 part Flame retardant: 0.1-1 part Antifreeze: 0.5-5 parts Smoke suppressant: 70-120ppm.

2. A seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The main components and mass fractions of the foaming agent are as follows: Bio-based chelating surfactant: 50-60 parts Bio-based nonionic surfactant: 15-30 parts Amino acid surfactant: 5-10 parts Foam stabilizer: 0.02-1 part Flame retardant 0.1-1 part Antifreeze: 1-5 parts Smoke suppressant: 90-120ppm.

3. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The main components and mass fractions of the foaming agent are as follows: Bio-based chelating surfactant: 40-50 parts Bio-based nonionic surfactant: 20-50 parts Amino acid surfactant: 5-10 parts Foam stabilizer: 0.02-1 part Flame retardant 0.1-1 part Antifreeze: 3-5 parts Smoke suppressant: 80-100ppm.

4. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The bio-based high chelating surfactant is an alkyl glycoside citric acid monoester salt or an alcohol ether glycoside citric acid monoester salt; The alkyl glycoside citric acid monoester salt or the alcohol ether glycoside citric acid monoester salt is prepared from the alkyl glycoside and citric acid or citric anhydride.

5. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The bio-based nonionic surfactant is one of alkyl glycoside APG0810, APG10, alcohol ether glycoside AEG050, etc., or a combination thereof.

6. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The amino acid surfactant is one of sodium lauroyl sarcosinate, disodium cocoyl glutamate and sodium cocoyl glycinate or a combination thereof.

7. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The foam stabilizer is one of xanthan gum, sodium alginate (SA) and sodium carboxymethyl cellulose (CMC).

8. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The flame retardant is urea.

9. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The antifreeze agent is ethylene glycol or propylene glycol.

10. The seawater-resistant bio-based hydrocarbon foaming agent for firefighting according to claim 1, characterized in that: The smoke suppressant is ferrocene.

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