Fluorine-free anti-dissolution foam extinguishing agent and preparation method thereof

Abstract

The invention relates to the technical field of fire extinguishing agents, and discloses a fluoride-free anti-solubility foam fire extinguishing agent and a preparation method thereof.The fluoride-free anti-solubility foam fire extinguishing agent comprises a hydrocarbon surfactant, a carboxyl modified organosilicon surfactant, a foam stabilizer, a cosolvent, water and a pH regulator; the carboxyl modified organic silicon surfactant is obtained by modifying an organic silicon surfactant by using maleic anhydride; the foam stabilizer contains xanthan gum and a component A, according to the invention, the organosilicon surfactant is modified, so that the obtained carboxyl modified surfactant has good surface activity and water solubility; xanthan gum and a component A (polyethylene oxide-polypropylene oxide-polyethylene oxide and other substances) are compounded to serve as a foam stabilizer, so that the foam stability and the anti-dissolving performance can be improved, and the foam stabilizer also has temperature-sensitive-thermal response performance; under the combined action of the components, the fire extinguishing agent provided by the invention has excellent fire extinguishing performance and can quickly extinguish non-polar fuel and polar fuel.

Description

Technical Field

[0001] The invention relates to the technical field of fire extinguishing agents, and in particular to a fluorine-free, solvent-resistant foam fire extinguishing agent and a preparation method thereof. Background Art

[0002] Fluorine-containing foam fire extinguishing agents such as aqueous film-forming foam fire extinguishing agents are widely used in oil fire fighting because they can quickly spread on the oil surface to form a liquid film to inhibit the volatilization of oil. However, with the widespread use of aqueous film-forming foam fire extinguishing agents around the world, the environmental problems caused by fluorocarbon surfactants such as perfluorooctane sulfonate (PFOS) they contain have become increasingly prominent. This type of fluorocarbon surfactant is extremely stable in the environment and has bioaccumulation properties. A certain amount can cause great harm to the nervous and immune systems of organisms. Due to its strong harmfulness to the environment, countries around the world have formulated increasingly stringent environmental protection regulations to limit the use of PFOS. Therefore, it is of great research significance to strengthen the control of PFOS and develop efficient and environmentally friendly PFOS-free foam fire extinguishing agents.

[0003] In addition, most gasoline currently contains polar solvents such as ethanol, which have a certain destructive effect on foam. In order to resist the dehydration destructive effect of polar liquids, sodium carboxymethyl cellulose, xanthan gum, etc. are usually added to the foam extinguishing agent to form a layer of adhesive film on the polar solvent, thereby preventing the polar solvent from further destroying the foam. However, only when sodium carboxymethyl cellulose and xanthan gum are added in large amounts can they have a good ability to resist polar solvents, which will also lead to an increase in the viscosity of the foam extinguishing agent system, and the foaming performance and flow properties of the foam extinguishing agent are affected, thereby causing the fire extinguishing performance of the foam extinguishing agent to deteriorate. Therefore, it is urgent to develop a PFOS-free anti-solvent environmentally friendly foam extinguishing agent with good fire extinguishing performance. Summary of the invention

[0004] In view of the shortcomings of the prior art, a fluorine-free, anti-solvent foam fire extinguishing agent and a preparation method thereof are provided. The fluorine-free, anti-solvent foam fire extinguishing agent has excellent fire extinguishing performance and temperature-sensitive-thermal response performance, and can be widely used in Class A and B fires and other fires.

[0005] In order to achieve the above-mentioned object, the present invention provides a fluorine-free and anti-solvent foam fire extinguishing agent on one hand, wherein the fluorine-free and anti-solvent foam fire extinguishing agent contains a hydrocarbon surfactant, a carboxyl-modified silicone surfactant, a foam stabilizer, a cosolvent, water and an optional pH regulator;

[0006] Wherein, the carboxyl-modified organosilicon surfactant is obtained by modifying a hydroxyl-containing organosilicon surfactant using maleic anhydride;

[0007] The foam stabilizer contains xanthan gum and component A, wherein component A is selected from one or more of polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxyethylene-polyoxypropylene-polyoxyethylene, polyethylene glycol-polypropylene glycol-polyethylene glycol, styrene-butadiene and styrene-butadiene-3-chloropropylene copolymers, polyacrylamide, poly(N-isopropylacrylamide), poly(N,N-dimethylaminoethyl methacrylate isopropylacrylamide), poly(N-vinylcaprolactam acrylic acid), and poly(diethyl vinylphosphonate).

[0008] Preferably, in the foam stabilizer, the weight ratio of xanthan gum to component A is 1:1-5.

[0009] Preferably, the carboxyl-modified silicone surfactant is prepared according to the following process:

[0010] Under stirring, a hydroxyl-containing organosilicon surfactant, maleic anhydride and an organic solvent are mixed, reacted at 60-90° C. for 2-8 hours, and then cooled and purified.

[0011] Preferably, the weight ratio of the hydroxyl-containing silicone surfactant to maleic anhydride is 1:0.5-3.

[0012] Preferably, the weight ratio of the organic solvent to the total weight of the hydroxyl-containing organosilicon surfactant and maleic anhydride is 10-40:100.

[0013] Preferably, the hydroxyl-containing organosilicon surfactant is a hydroxyl-containing polyether-modified organosiloxane.

[0014] Preferably, the fluorine-free anti-solvent foam fire extinguishing agent contains: 5-30wt% hydrocarbon surfactant, 0.5-5wt% carboxyl-modified silicone surfactant, 0.1-4wt% foam stabilizer, 1-6wt% cosolvent, 0-6wt% pH adjuster, and 50-80wt% water.

[0015] Preferably, the hydrocarbon surfactant is selected from at least two of anionic hydrocarbon surfactants, cationic hydrocarbon surfactants, amphoteric hydrocarbon surfactants and nonionic hydrocarbon surfactants.

[0016] Preferably, the co-solvent is selected from one or more of ethylene glycol, diethylene glycol butyl ether and isobutyl alcohol.

[0017] Preferably, the pH adjuster is selected from one or more of citric acid, lactic acid, tartaric acid, malic acid, phosphoric acid and acetic acid.

[0018] Preferably, the anionic hydrocarbon surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate and sodium α-olefin sulfonate.

[0019] Preferably, the cationic hydrocarbon surfactant is selected from one or more of dodecyldimethylbenzyl ammonium chloride, polyoxyethylene alkylamide, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether.

[0020] Preferably, the amphoteric hydrocarbon surfactant is selected from one or more of cocamidopropyl betaine, N-dodecyl dimethyl betaine and 2-undecyl-N-acetoxy-N(2-hydroxyethyl)imidazoline.

[0021] Preferably, the nonionic hydrocarbon surfactant is selected from one or more of alkyl glycosides, fatty alcohol polyoxyethylene ethers and alkylphenol polyoxyethylene ethers.

[0022] Preferably, the fluorine-free and solvent-resistant foam fire extinguishing agent further contains one or more of a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent and a preservative.

[0023] Preferably, the flame retardant is selected from one or more of potassium bicarbonate, sodium bicarbonate, diammonium hydrogen phosphate and diammonium dihydrogen phosphate.

[0024] Preferably, the corrosion inhibitor is selected from one or more of sodium chromate, potassium chromate, sodium tripolyphosphate and sodium hexametaphosphate.

[0025] Preferably, the antifreeze agent is selected from one or more of urea, acetamide, methanol and ethylene glycol.

[0026] Preferably, the chelating agent is disodium ethylenediaminetetraacetate.

[0027] Preferably, the preservative is sodium benzoate.

[0028] Preferably, the fluorine-free anti-solvent foam fire extinguishing agent contains: 5-30wt% of hydrocarbon surfactant, 0.5-5wt% of carboxyl-modified silicone surfactant, 0.1-4wt% of foam stabilizer, 1-6wt% of solvent promoter, 2-8wt% of flame retardant, 2-4wt% of antifreeze agent, 0.1-0.5wt% of corrosion inhibitor, 0.5-3wt% of chelating agent, 0.5-1.5wt% of preservative, 1-6wt% of pH adjuster, and 50-80wt% of water.

[0029] The second aspect of the present invention provides a method for preparing the fluorine-free and solvent-resistant foam fire extinguishing agent as described above, the method comprising: mixing a hydrocarbon surfactant, a carboxyl-modified organic silicon surfactant, a foam stabilizer, a co-solvent and water.

[0030] Preferably, the method comprises the following steps:

[0031] (1) mixing a hydrocarbon surfactant, a carboxyl-modified silicone surfactant and water to obtain a first solution;

[0032] (2) mixing a foam stabilizer and a co-solvent to obtain a second solution;

[0033] (3) Mixing the first solution and the second solution.

[0034] Preferably, step (1) comprises:

[0035] The hydrocarbon surfactant, the carboxyl-modified organic silicon surfactant, the flame retardant, the corrosion inhibitor, the antifreeze agent, the chelating agent and water are mixed to obtain a first solution.

[0036] Compared with the prior art, the fluorine-free and solvent-resistant foam fire extinguishing agent and the preparation method thereof of the present invention have the following advantages:

[0037] 1. The present invention improves the water solubility of the hydroxyl-containing organosilicon surfactant by using maleic anhydride to modify the organosilicon surfactant without affecting its surface activity, so that the obtained carboxyl-modified surfactant has good surface activity and water solubility, and is compounded with a hydrocarbon surfactant to improve its foaming performance.

[0038] 2. The present invention uses a composite solution of xanthan gum and component A as a foam stabilizer, which not only improves the foam stability and anti-solvent performance, but also solves the problem of increased viscosity of the system due to the addition of a large amount of xanthan gum. It also has temperature-sensitive and heat-responsive properties, good fluidity and foaming properties at room temperature, and can be converted into a gel with higher viscosity and attached to the surface of the burning object during a high-temperature fire extinguishing process, thereby achieving the effects of cooling, oxygen isolation and suffocation, thereby improving the fire extinguishing performance and anti-burning performance of the foam fire extinguishing agent.

[0039] 3. In the present invention, the fluorine-free anti-solvent foam fire extinguishing agent contains a hydrocarbon surfactant, a carboxyl-modified silicone surfactant, a foam stabilizer, a cosolvent and water. Under the joint action of the above components, the fluorine-free anti-solvent foam fire extinguishing agent has high surface activity, high foam stability, good foaming ability and resistance to polar solvent dissolution, so that it has excellent fire extinguishing performance and anti-burning performance, and can efficiently extinguish non-polar fuels and polar fuels.

[0040] 4. The raw materials of the fluorine-free anti-solvent foam fire extinguishing agent are easy to obtain, low in cost, and the biodegradability of each raw material component is low. It does not contain fluorocarbon surfactants at all, has little pollution to the environment, and has no toxic side effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1The spreading condition of the fluorine-free anti-solvent foam fire extinguishing agent prepared in Example 1 of the present invention on the surface of the ethanol solvent after foaming;

[0042] Figure 2 This is a diagram of the gel state of the fluorine-free anti-solvent fire extinguishing agent prepared in Example 1 of the present invention at 55°C. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0044] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0045] The present invention provides a fluorine-free anti-solvent foam fire extinguishing agent, wherein the fluorine-free anti-solvent foam fire extinguishing agent contains a hydrocarbon surfactant, a carboxyl-modified organic silicon surfactant, a foam stabilizer, a cosolvent, water and an optional pH regulator;

[0046] The carboxyl-modified organic silicon surfactant is obtained by modifying the organic silicon surfactant with maleic anhydride.

[0047] In a preferred embodiment, the foam stabilizer contains xanthan gum and component A, and the component A is selected from one or more of polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxyethylene-polyoxypropylene-polyoxyethylene, polyethylene glycol-polypropylene glycol-polyethylene glycol, styrene-butadiene and styrene-butadiene-3-chloropropylene copolymers, polyacrylamide, poly(N-isopropylacrylamide), poly(N,N-dimethylaminoethyl methacrylate isopropylacrylamide), poly(N-vinylcaprolactam acrylic acid), and poly(diethyl vinyl phosphonate). By adding xanthan gum, the loss rate of the foam wall can be effectively slowed down, thereby enhancing the stability of the foam and improving the burning resistance of the fluorine-free foam fire extinguishing agent; by compounding xanthan gum with component A, the amount of xanthan gum used can be reduced, and the foam stability and resistance to polar solvent dissolution can be effectively improved. It also has outstanding temperature-sensitive and thermal response properties, so that the foam fire extinguishing agent exhibits good fluidity and foaming properties at room temperature, and is transformed into a gel with higher viscosity during the fire extinguishing process and adheres to the surface of the burning object, playing a role in cooling and oxygen isolation and suffocation.

[0048] In a preferred embodiment, in the foam stabilizer, the weight ratio of xanthan gum to component A is 1:1-5, more preferably 1:1.5-4. Within the above range, the obtained fluorine-free and solvent-resistant foam fire extinguishing agent has better fluidity and foaming performance.

[0049] Organosilicon surfactants have silane groups and siloxane groups with strong hydrophobic effects, which make them have high surface activity, and thus can greatly reduce the surface tension of water. In addition, organosilicon surfactants also have obvious advantages in terms of stability, wettability, and spreadability, but their water solubility is poor, which limits their application. At present, the water solubility of organosilicon surfactants is improved by premixing organic solvents with organosilicon surfactants. This will lead to the use of a large amount of organic solvents, which is not conducive to efficient fire extinguishing, and will increase production costs and reduce environmental protection. In the present invention, the carboxyl-modified organosilicon surfactant is obtained by modifying the organosilicon surfactant with maleic anhydride (i.e., maleic anhydride). In this way, not only the water solubility of the organosilicon surfactant is improved, but also its surface activity is not affected.

[0050] In a specific embodiment, the carboxyl-modified organosilicon surfactant is prepared according to the following process: a hydroxyl-containing organosilicon surfactant, maleic anhydride and an organic solvent are mixed and reacted under stirring, and then cooled and purified. The reaction temperature is 60 to 90°C, and specifically, for example, it can be 60°C, 65°C, 70°C, 75°C, 80°C, 85°C or 90°C; the reaction time is 2 to 8 hours, and specifically, for example, it can be 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours or 8 hours.

[0051] In the present invention, the purification is carried out by vacuum distillation.

[0052] In a preferred embodiment, the weight ratio of the hydroxyl-containing silicone surfactant to maleic anhydride is 1:0.5-3.

[0053] In a preferred embodiment, the ratio of the weight of the organic solvent to the total weight of the hydroxyl-containing silicone surfactant and maleic anhydride is 10 to 40:100, specifically, for example, 10:100, 15:100, 20:100, 22:100, 25:100, 30:100, 33:100, 35:100 or 40:100.

[0054] In a preferred embodiment, the hydroxyl-containing organosilicon surfactant is a hydroxyl-containing polyether-modified organosiloxane.

[0055] Hydrocarbon surfactants are environmentally friendly and have good foaming properties. In the present invention, the hydrocarbon surfactant is selected from at least two of anionic hydrocarbon surfactants, cationic hydrocarbon surfactants, amphoteric hydrocarbon surfactants and nonionic hydrocarbon surfactants, and the foaming properties of the hydrocarbon surfactants are further improved by compounding the hydrocarbon surfactants with silicone surfactants.

[0056] In specific implementation, the compounding methods of hydrocarbon surfactants can be: compounding of anionic hydrocarbon surfactants and amphoteric hydrocarbon surfactants, compounding of anionic hydrocarbon surfactants, amphoteric hydrocarbon surfactants and non-ionic hydrocarbon surfactants, compounding of anionic surfactants and non-ionic hydrocarbon surfactants, compounding of cationic hydrocarbon surfactants and non-ionic hydrocarbon surfactants, compounding of cationic hydrocarbon surfactants and amphoteric hydrocarbon surfactants.

[0057] In a preferred embodiment, the anionic hydrocarbon surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate and sodium α-olefin sulfonate.

[0058] In a preferred embodiment, the cationic hydrocarbon surfactant is selected from one or more of dodecyldimethylbenzyl ammonium chloride, polyoxyethylene alkylamide, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether.

[0059] In a preferred embodiment, the amphoteric hydrocarbon surfactant is selected from one or more of cocamidopropyl betaine, N-dodecyl dimethyl betaine and 2-undecyl-N-acetoxy-N(2-hydroxyethyl)imidazoline.

[0060] In a preferred embodiment, the nonionic hydrocarbon surfactant is selected from one or more of alkyl glycosides, fatty alcohol polyoxyethylene ethers and alkylphenol polyoxyethylene ethers.

[0061] By adding a co-solvent, it can not only play a solubilizing role, but also reduce the freezing point of the fluorine-free anti-solvent foam fire extinguishing agent. In the present invention, the co-solvent is selected from one or more of ethylene glycol, diethylene glycol butyl ether and isobutyl alcohol. Preferably, the co-solvent is selected from at least two of ethylene glycol, diethylene glycol butyl ether and isobutyl alcohol.

[0062] In the present invention, the pH regulator is used to adjust the pH value of the fluorine-free foam fire extinguishing agent to a suitable range (6.0-9.5). It is understood that if the pH value of the prepared fluorine-free foam fire extinguishing agent is already between 6.0 and 9.5, there is no need to add the pH regulator.

[0063] Preferably, the pH adjuster is selected from one or more of citric acid, lactic acid, tartaric acid, malic acid, phosphoric acid and acetic acid, more preferably citric acid.

[0064] In a preferred embodiment, the fluorine-free and solvent-resistant foam fire extinguishing agent contains: 5 to 30 wt% hydrocarbon surfactant, 0.5 to 5 wt% carboxyl-modified silicone surfactant, 0.1 to 4 wt% foam stabilizer, 1 to 6 wt% co-solvent, 0 to 6 wt% pH adjuster, and 50 to 80 wt% water. Under the above ratio, the obtained fluorine-free and solvent-resistant foam fire extinguishing agent has better fire extinguishing performance.

[0065] More preferably, the fluorine-free and solvent-resistant foam fire extinguishing agent contains: 10-25wt% hydrocarbon surfactant, 2-4wt% carboxyl-modified silicone surfactant, 1-3wt% foam stabilizer, 2-5wt% co-solvent, 0-4wt% pH adjuster, and 50-80wt% water. Under the above ratio, the obtained fluorine-free and solvent-resistant foam fire extinguishing agent has better fire extinguishing performance.

[0066] In order to further improve the comprehensive performance of the fluorine-free and anti-solvent foam fire extinguishing agent, in a preferred embodiment, the fluorine-free and anti-solvent foam fire extinguishing agent also contains one or more of a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent and a preservative.

[0067] More preferably, the fluorine-free and solvent-resistant foam fire extinguishing agent further contains a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent, a preservative and a pH adjuster.

[0068] The present invention does not limit the specific type of the flame retardant. In order to make the flame retardant performance of the fluorine-free anti-solvent foam fire extinguishing agent better, in a preferred embodiment, the flame retardant is selected from one or more of potassium bicarbonate, sodium bicarbonate, diammonium hydrogen phosphate and diammonium dihydrogen phosphate.

[0069] In the present invention, the corrosion inhibitor is selected from one or more of sodium chromate, potassium chromate, sodium tripolyphosphate and sodium hexametaphosphate.

[0070] In the present invention, the antifreeze agent is selected from one or more of urea, acetamide, methanol and ethylene glycol.

[0071] In a preferred embodiment, the chelating agent is disodium ethylenediaminetetraacetate.

[0072] By adding a preservative, the storage time of the fluorine-free and solvent-resistant foam fire extinguishing agent can be increased. In a preferred embodiment, the preservative is sodium benzoate.

[0073] In a preferred embodiment, the fluorine-free anti-solvent foam fire extinguishing agent contains, by weight percentage: 5 to 30 wt % hydrocarbon surfactant, 0.5 to 5 wt % carboxyl-modified silicone surfactant, 0.1 to 4 wt % foam stabilizer, 1 to 6 wt % solvent promoter, 2 to 4 wt % antifreeze agent, 0.1 to 0.5 wt % corrosion inhibitor, 0.5 to 3 wt % chelating agent, 0.5 to 1.5 wt % preservative, 1 to 6 wt % pH adjuster, and 50 to 80 wt % water.

[0074] Further preferably, the fluorine-free anti-solvent foam fire extinguishing agent contains, in terms of weight percentage: 10-25wt% hydrocarbon surfactant, 2-4wt% carboxyl-modified silicone surfactant, 1-3wt% foam stabilizer, 2-5wt% solvent promoter, 2-4wt% antifreeze agent, 0.1-0.5wt% corrosion inhibitor, 0.5-3wt% chelating agent, 0.5-1.5wt% preservative, 1-4wt% pH adjuster, and 50-80wt% water.

[0075] The present invention does not limit the specific preparation steps of the fluorine-free and solvent-resistant foam fire extinguishing agent, as long as the raw materials are mixed evenly.

[0076] It is understood that the fluorine-free anti-solvent foam fire extinguishing agent is a concentrated solution, which needs to be mixed with water to prepare a foam solution for fire extinguishing when used. Preferably, in the foam solution, the weight ratio of the fluorine-free anti-solvent foam fire extinguishing agent to water is 2-8:92-98, and most preferably 6:94.

[0077] The present invention also provides a method for preparing the fluorine-free and solvent-resistant foam fire extinguishing agent as described above, the method comprising: mixing a hydrocarbon surfactant, a carboxyl-modified organic silicon surfactant, a foam stabilizer, a cosolvent and water.

[0078] In a preferred embodiment, the method comprises the following steps:

[0079] (1) mixing a hydrocarbon surfactant, a carboxyl-modified silicone surfactant and water to obtain a first solution;

[0080] (2) mixing a foam stabilizer and a co-solvent to obtain a second solution;

[0081] (3) Mixing the first solution and the second solution.

[0082] In a preferred embodiment, the fluorine-free and solvent-resistant foam fire extinguishing agent further contains a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent and a preservative.

[0083] The present invention does not limit the specific steps of adding the above components. In a preferred embodiment, the above components are added to step (1), that is, step (1) includes: mixing a hydrocarbon surfactant, a carboxyl-modified silicone surfactant, a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent and water to obtain a first solution.

[0084] Further preferably, step (1) comprises:

[0085] Step S10, mixing a hydrocarbon surfactant with a portion of deionized water, and then adding a carboxyl-modified organic silicon surfactant to obtain a mixed solution A;

[0086] Step S20, dissolving the flame retardant, the corrosion inhibitor, the antifreeze agent and the chelating agent in the remaining deionized water to obtain a mixed solution B, and mixing the mixed solution B with the mixed solution A to obtain a first solution.

[0087] In a preferred embodiment, step (3) comprises: mixing the first solution, the second solution, the preservative and the pH adjuster. Further preferably, step (3) comprises: mixing the first solution and the second solution, then adding the preservative and the pH adjuster, and stirring evenly.

[0088] The present invention will be described in detail below by way of examples, but the protection scope of the present invention is not limited thereto. The raw materials in the following examples are all commercially available unless otherwise specified.

[0089] In the following examples, hydroxy polyether modified organosiloxane was purchased from Zhejiang Runhe Silicone New Materials Co., Ltd., model RH-288; cocamidopropyl betaine was purchased from Qingdao Huayuan Polymer Co., Ltd., model CAB-35; alkyl polyglycoside was purchased from Qingdao Huayuan Polymer Co., Ltd., model APG0810; sodium lauryl sulfate was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., batch number C2116183; polyoxyethylene-polyoxypropylene-polyoxyethylene polymer (F127) and polyethylene oxide-polypropylene oxide-polyethylene oxide (P123) were purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; xanthan gum was purchased from Shanghai Myrel Biochemical Technology Co., Ltd.

[0090] In the following examples, the pH value determination method is carried out with reference to 5.5 "pH value" in GB 15308-2006 "Foam Fire Extinguishing Agents".

[0091] Example 1

[0092] This example is used to illustrate the fluorine-free and solvent-resistant foam fire extinguishing agent and its preparation method according to the present invention.

[0093] Fluorine-free anti-solvent foam fire extinguishing agent: hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside) 20g, carboxyl modified silicone surfactant 3g, foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide) 2g, cosolvent (compounded by diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1) 3g, flame retardant (compounded by diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1) 6g, antifreeze agent (urea) 4g, corrosion inhibitor (sodium tripolyphosphate) 0.4g, chelating agent (disodium ethylenediaminetetraacetic acid) 1g, preservative (sodium benzoate) 0.5g, pH adjuster (20wt% citric acid aqueous solution) 3g, deionized water 57.1g.

[0094] The weight ratio of sodium lauryl sulfate, cocamide betaine and alkyl glucoside is 2:9:9;

[0095] The weight ratio of xanthan gum to polyethylene oxide-polypropylene oxide-polyethylene oxide is 1:4;

[0096] The carboxyl-modified silicone surfactant is prepared according to the following steps: 100 g of hydroxyl-containing polyether-modified silicone oxane and 100 g of maleic anhydride are mixed in 40 g of isopropanol under stirring, and reacted at 85° C. for 4 hours to obtain a reaction solution; the reaction solution is cooled to room temperature, and then the solution is transferred to a rotary evaporator, and the product is purified and recovered by reduced pressure distillation to obtain a carboxyl-modified silicone surfactant.

[0097] Preparation of fluorine-free anti-solvent foam fire extinguishing agent:

[0098] (1) dissolving sodium lauryl sulfate in 30 g of deionized water, then adding cocamide betaine and alkyl polyglycoside, stirring evenly, then adding carboxyl-modified silicone surfactant, stirring evenly, to obtain a mixed solution A;

[0099] (2) dissolving the flame retardant, corrosion inhibitor, antifreeze agent, and chelating agent in the remaining deionized water, stirring evenly to obtain a mixed solution B, adding the mixed solution B to the mixed solution A and stirring for 15 minutes to obtain a first solution;

[0100] (3) dissolving xanthan gum in a cosolvent, then adding polyethylene oxide-polypropylene oxide-polyethylene oxide, stirring and dissolving, to obtain a second solution;

[0101] (4) Add the second solution to the first solution and stir evenly, then add the preservative and the pH adjuster, and continue stirring for 30 minutes to obtain a fluorine-free and anti-solvent foam fire extinguishing agent.

[0102] According to the test, the pH value of the fluorine-free and solvent-resistant foam fire extinguishing agent is between 6.0 and 9.5.

[0103] Example 2

[0104] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent foam fire extinguishing agent: 25g hydrocarbon surfactant, 2g carboxyl-modified silicone surfactant, 1g foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide), 3g cosolvent (formed by compounding diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1), 5g flame retardant (formed by compounding diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1), 4g antifreeze agent (urea), 0.1g corrosion inhibitor (sodium tripolyphosphate), 2.5g chelating agent (disodium ethylenediaminetetraacetic acid), 1g preservative (sodium benzoate), 3.5g pH adjuster (20wt% citric acid aqueous solution), and 52.9g deionized water;

[0105] The weight ratio of xanthan gum to polyethylene oxide-polypropylene oxide-polyethylene oxide is 2:3.

[0106] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0107] Example 3

[0108] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent foam fire extinguishing agent includes: 15 g hydrocarbon surfactant, 4 g carboxyl-modified silicone surfactant, 1 g foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide), 2 g cosolvent (formed by compounding diethylene glycol butyl ether and ethylene glycol in a weight ratio of 1:1), 4 g flame retardant (formed by compounding diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 1:1), 2 g antifreeze agent (urea), 0.3 g corrosion inhibitor (sodium tripolyphosphate), 1 g chelating agent (disodium ethylenediaminetetraacetic acid), 1.5 g preservative (sodium benzoate), 3 g pH adjuster (20 wt% citric acid aqueous solution), and 66.2 g deionized water;

[0109] The weight ratio of xanthan gum to polyethylene oxide-polypropylene oxide-polyethylene oxide is 2:3.

[0110] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0111] Example 4

[0112] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent fire extinguishing agent contains: 16 g of hydrocarbon surfactant (sodium dodecyl sulfate and alkyl glycoside), 2 g of carboxyl-modified silicone surfactant, 3 g of foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide), 4 g of cosolvent (formed by compounding diethylene glycol butyl ether and ethylene glycol in a weight ratio of 3:1), 3 g of flame retardant (formed by compounding diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1), 3 g of antifreeze agent (urea), 0.4 g of corrosion inhibitor (sodium tripolyphosphate), 1 g of chelating agent (disodium ethylenediaminetetraacetic acid), 0.8 g of preservative (sodium benzoate), 2.5 g of pH adjuster (20 wt % citric acid aqueous solution), and 64.3 g of deionized water;

[0113] Wherein, the weight ratio of sodium lauryl sulfate and alkyl polyglycoside is 1:1;

[0114] The weight ratio of xanthan gum to polyethylene oxide-polypropylene oxide-polyethylene oxide is 1:3.

[0115] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0116] Example 5

[0117] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent foam fire extinguishing agent includes: 10 g hydrocarbon surfactant, 3.5 g carboxyl-modified silicone surfactant, 2 g foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide), 5 g cosolvent (formed by compounding diethylene glycol butyl ether and ethylene glycol in a weight ratio of 1.5:1), 8 g flame retardant (formed by compounding diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 3:1), 4 g antifreeze agent (urea), 0.3 g corrosion inhibitor (sodium tripolyphosphate), 2.5 g chelating agent (disodium ethylenediaminetetraacetic acid), 1 g preservative (sodium benzoate), 2 g pH adjuster (20 wt% citric acid aqueous solution), and 61.7 g deionized water;

[0118] The weight ratio of xanthan gum to polyethylene oxide-polypropylene oxide-polyethylene oxide is 2:3.

[0119] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0120] Example 6

[0121] The method described in Example 1 is used for implementation, except that the carboxyl-modified silicone surfactant is prepared according to the following process: 100 g of hydroxyl-containing polyether-modified silicone siloxane and 150 g of maleic anhydride are mixed in 75 g of isopropanol under stirring, and reacted at 65° C. for 8 h to obtain a reaction solution, that is, the ratio of the weight of isopropanol to the total weight of the hydroxyl-containing polyether-modified silicone siloxane and maleic anhydride is 30:100; the reaction solution is cooled to room temperature, and then the solution is transferred to a rotary evaporator, and the product is purified and recovered by reduced pressure distillation to obtain a carboxyl-modified silicone surfactant.

[0122] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0123] Example 7

[0124] The method described in Example 1 is used for implementation, except that the carboxyl-modified silicone surfactant is prepared according to the following process: 100 g of hydroxyl-containing polyether-modified silicone siloxane and 80 g of maleic anhydride are mixed in 72 g of isopropanol under stirring, and reacted at 90° C. for 3 h to obtain a reaction solution, that is, the ratio of the weight of isopropanol to the total weight of the hydroxyl-containing polyether-modified silicone siloxane and maleic anhydride is 40:100; the reaction solution is cooled to room temperature, and then the solution is transferred to a rotary evaporator, and the product is purified and recovered by reduced pressure distillation to obtain a carboxyl-modified silicone surfactant.

[0125] According to the test, the pH value of the fluorine-free anti-solvent fire extinguishing agent is between 6.0 and 9.5.

[0126] Example 8

[0127] The method described in Example 1 was followed, except that no flame retardant, preservative, antifreeze agent, corrosion inhibitor and chelating agent were added (an equal amount of deionized water was used instead).

[0128] Specifically, the fluorine-free anti-solvent foam fire extinguishing agent: 20g of hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside), 3g of carboxyl-modified silicone surfactant, 2g of foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide), 3g of cosolvent (diethylene glycol butyl ether and ethylene glycol), 3g of pH adjuster (20wt% citric acid aqueous solution), and 69g of deionized water.

[0129] Example 9

[0130] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent foam fire extinguishing agent is prepared according to the following steps: (1) deionized water is first added, and then sodium lauryl sulfate, cocamide betaine, alkyl glucoside, carboxyl-modified silicone surfactant, flame retardant, corrosion inhibitor, antifreeze agent and chelating agent are added under stirring to obtain a first solution; (2) xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide are added to the cosolvent and stirred to obtain a second solution; (3) under stirring, the second solution, preservative and pH adjuster are added to the first solution in sequence, and stirring is continued for 30 minutes to obtain a fluorine-free anti-solvent foam fire extinguishing agent.

[0131] According to the test, the pH value of the fluorine-free and solvent-resistant foam 5 fire extinguishing agent is between 6.0 and 9.5.

[0132] Example 10

[0133] The method described in Example 1 is used for implementation, except that the fluorine-free anti-solvent foam fire extinguishing agent: hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside) 18g, carboxyl-modified silicone surfactant 3g, foam stabilizer (xanthan gum and polyoxyethylene-polyoxypropylene-polyoxyethylene) 2g, cosolvent (compounded by diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1) 3g, flame retardant (sodium bicarbonate) 6g, antifreeze agent (urea) 4g, corrosion inhibitor (potassium chromate) 0.4g, chelating agent (disodium ethylenediaminetetraacetic acid) 1g, preservative (sodium benzoate) 0.5g, pH adjuster (20wt% citric acid aqueous solution) 3g, deionized water 59.1g.

[0134] Among them, the weight ratio of sodium lauryl sulfate, cocamide betaine and alkyl glucoside is 2:8:8; the weight ratio of xanthan gum and polyoxyethylene-polyoxypropylene-polyoxyethylene is 1:4.

[0135] Comparative Example 1

[0136] The method described in Example 1 is used for implementation, except that the hydroxyl-containing polyether-modified organosiloxane is not modified. That is, when preparing the fluorine-free anti-solvent foam fire extinguishing agent, the carboxyl-modified organosilicone surfactant is replaced with a hydroxyl-containing organosilicone surfactant (hydroxyl-containing polyether-modified organosiloxane);

[0137] Specifically, the fluorine-free anti-solvent foam fire extinguishing agent: hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside) 20g, hydroxyl-containing polyether modified organic silicone 3g, foam stabilizer (xanthan gum and polyethylene oxide-polypropylene oxide-polyethylene oxide) 2g, cosolvent (compounded by diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1) 3g, flame retardant (compounded by diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1) 6g, antifreeze agent (urea) 4g, corrosion inhibitor (sodium tripolyphosphate) 0.4g, chelating agent (disodium ethylenediaminetetraacetic acid) 1g, preservative (sodium benzoate) 0.5g, pH adjuster (20wt% citric acid aqueous solution) 3g, deionized water 57.1g.

[0138] Comparative Example 2

[0139] The method described in Example 1 is used for implementation, except that the foam stabilizer is only xanthan gum;

[0140] Specifically, the fluorine-free anti-solvent foam fire extinguishing agent: hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside) 20g, carboxyl modified silicone surfactant 3g, foam stabilizer (xanthan gum) 2g, solvent (compounded by diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1) 3g, flame retardant (compounded by diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1) 6g, antifreeze agent (urea) 4g, corrosion inhibitor (sodium tripolyphosphate) 0.4g, chelating agent (disodium ethylenediaminetetraacetic acid) 1g, preservative (sodium benzoate) 0.5g, pH adjuster (20wt% citric acid aqueous solution) 3g, deionized water 57.1g.

[0141] Comparative Example 3

[0142] The method described in Example 1 is used for implementation, except that the foam stabilizer is only polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0143] Specifically, the fluorine-free anti-solvent foam fire extinguishing agent: hydrocarbon surfactant (sodium dodecyl sulfate, cocamide betaine and alkyl glucoside) 20g, carboxyl modified silicone surfactant 3g, foam stabilizer (polyethylene oxide-polypropylene oxide-polyethylene oxide) 2g, cosolvent (compounded by diethylene glycol butyl ether and ethylene glycol in a weight ratio of 2:1) 3g, flame retardant (compounded by diamine hydrogen phosphate and sodium bicarbonate in a weight ratio of 2:1) 6g, antifreeze agent (urea) 4g, corrosion inhibitor (sodium tripolyphosphate) 0.4g, chelating agent (disodium ethylenediaminetetraacetic acid) 1g, preservative (sodium benzoate) 0.5g, pH adjuster (20wt% citric acid aqueous solution) 3g, deionized water 57.1g.

[0144] Test Example 1

[0145] The fluorine-free anti-solvent foam fire extinguishing agents prepared in Examples 1-10 and Comparative Examples 1-3 were tested for freezing point, foam performance, fire extinguishing performance and anti-burning performance. The test results are shown in Table 1.

[0146] Equipment used in the test: thermometer, freezing point tester, foam generation system, foam collector, liquid separation tester, balance, stopwatch, round, conical bottom steel oil pan (inner diameter: 565mm, depth 150mm, oil pan area 0.25m 2 ), steel fire-resistant tank (inner diameter 120mm, depth 80mm)

[0147] Foaming multiple and 25% liquid separation time test: According to GB15308-2006 "Foam Fire Extinguishing Agent" standard, use the foam generation system to test;

[0148] Freezing point test: carried out in accordance with GB 15308-2006 "Foam fire extinguishing agent";

[0149] Fire extinguishing performance and anti-burning performance test: refer to the small test method for foam fire extinguishing performance test in Appendix A of GB15308-2006 "Foam Fire Extinguishing Agent". The system mainly consists of foam liquid storage tank, pressure gauge, standard gun, foam liquid delivery pipe, air compressor and pipeline. The flammable liquid fuel is #120 solvent oil for rubber industry. The specific operation process is as follows: (1) Prepare a foam solution by mixing fluorine-free anti-soluble foam fire extinguishing agent with water in a ratio of 6:94 and fill it into a foam solution storage tank; (2) Apply a pressure of 0.7 MPa to the foam solution storage tank and adjust the 7 mm flow regulating head so that the vertical foam flow rate is (725-775) g / min (the flow rate is determined by the injection volume in 6 seconds); (3) Adjust the position of the foam gun so that the gun remains horizontal and 150 mm above the upper edge of the oil pan so that the foam falls in the center of the oil pan; (4) Wash the oil pan with water, add 9 L of fuel, add 1 L of fuel to the anti-burning tank, and place it in a safe place; (5) Open the exhaust device, add fuel, ignite the oil pan within 5 minutes, pre-burn for 60 seconds, start supplying foam, and record the fire extinguishing time; (6) Supply foam for 180 seconds, wait for 60 seconds, place the anti-burning tank containing 1 L of fuel in the center of the oil pan and ignite it, and record the anti-burning time.

[0150] Table 1

[0151]

[0152]

[0153] It can be seen from the results in Table 1 that the fluorine-free, anti-solvent foam fire extinguishing agents prepared in Examples 1-10 of the present invention have excellent foaming multiples, a long 25% liquid separation time, a fire extinguishing time of less than 1 min, and a 25% anti-burning time of more than 10 min, indicating that the fluorine-free, anti-solvent foam fire extinguishing agent provided by the present invention has excellent foaming performance, fire extinguishing performance and anti-burning performance.

[0154] Test Example 2

[0155] Film-forming property is one of the important properties of anti-solvent foam fire extinguishing agent. Therefore, the present invention further explores the film-forming property of the prepared fire extinguishing agent.

[0156] Test method: The fire extinguishing agent product prepared in Example 1-2 is used to generate foam through a foam generating system, and the foam is evenly poured onto a polar solvent (ethanol) solution. The state of the test liquid forming a gel film on the surface of the ethanol solution is observed to qualitatively evaluate the anti-solvent performance of the foam fire extinguishing agent.

[0157] Test results: The fluorine-free, solvent-resistant foam fire extinguishing agent prepared in Example 1-2 can form a stable gel film on the surface of the polar solvent ethanol. Figure 1 This is the spreading condition of the fluorine-free and anti-solvent foam fire extinguishing agent prepared in Example 1 on the surface of the ethanol solvent after foaming. This shows that the fluorine-free and anti-solvent foam fire extinguishing agent provided by the present invention has excellent anti-solvent performance.

[0158] Test Example 3

[0159] Foam stability (half-life): The foam extinguishing agents prepared in Example 1 and Comparative Examples 2-3 were used to generate foam through a foam generating system, and then the foam was poured onto the surface of a cyclohexane liquid at 55°C. The timing was started to observe the state of the foam remaining on the cyclohexane surface. When the foam volume was reduced to half of the initial foam volume, the time was recorded. This time was the foam half-life at 55°C. The test results are shown in Table 2.

[0160] Table 2

[0161] project Foam stability at 55℃ (half-life), h Example 1 >5 Comparative Example 2 0.3 Comparative Example 3 1.2

[0162] It can be seen from Table 2 that the foam fire extinguishing agent prepared in Example 1 has a foam half-life of more than 5 hours at 55°C, indicating that the foam has good stability when applied to the surface of high-temperature fuel. This is mainly due to the fact that the foam changes from a flow state to a gel state when it is at a higher ambient temperature.

[0163] Test Example 4

[0164] Test method: The critical gelation temperature of the fluorine-free, anti-solvent foam fire extinguishing agent prepared in Example 1 was determined by a dynamic temperature gradient test using an AR2000ex rheometer. The foam fire extinguishing agent was heated from 25°C to 60°C at a heating rate of 2°C / min.

[0165] The test results show that the critical gel temperature of the fire extinguishing agent prepared in Example 1 is 50°C, at which point the foam fire extinguishing agent will quickly change from a solution state to a gel state. Figure 2 This shows that the fire extinguishing agent prepared by the present invention exhibits good fluidity at room temperature, and when applied to the surface of high-temperature fuel, the flowing foam is transformed into gel foam, thereby having good closed film-forming performance and anti-reignition ability, thereby improving the fire extinguishing performance and anti-burning ability of the fire extinguishing agent.

[0166] It should be noted that the preparation principles of Example 3-10 are similar to those of Example 1-2. Therefore, the fire extinguishing agent prepared in Example 3-10 also has excellent anti-solvent performance, good foam stability, good closed film-forming performance and anti-reignition ability, which will not be elaborated here.

[0167] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A fluorine-free, solvent-resistant foam fire extinguishing agent, characterized in that: The fluorine-free anti-solvent foam fire extinguishing agent contains a hydrocarbon surfactant, a carboxyl-modified silicone surfactant, a foam stabilizer, a cosolvent, water and an optional pH regulator; Wherein, the carboxyl-modified organosilicon surfactant is obtained by modifying a hydroxyl-containing organosilicon surfactant using maleic anhydride; The foam stabilizer contains xanthan gum and component A, wherein component A is selected from one or more of polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxyethylene-polyoxypropylene-polyoxyethylene, polyethylene glycol-polypropylene glycol-polyethylene glycol, styrene-butadiene and styrene-butadiene-3-chloropropylene copolymers, polyacrylamide, poly(N-isopropylacrylamide), poly(N,N-dimethylaminoethyl methacrylate isopropylacrylamide), poly(N-vinylcaprolactam acrylic acid), and poly(diethyl vinyl phosphonate).

2. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 1, characterized in that: In the foam stabilizer, the weight ratio of xanthan gum to component A is 1:1-5.

3. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 1, characterized in that: The carboxyl-modified silicone surfactant is prepared according to the following process: Under stirring, a hydroxyl-containing organosilicon surfactant, maleic anhydride and an organic solvent are mixed, reacted at 60-90° C. for 2-8 hours, and then cooled and purified.

4. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 3, characterized in that: The weight ratio of the hydroxyl-containing silicone surfactant to maleic anhydride is 1:0.5-3; Preferably, the weight ratio of the organic solvent to the total weight of the hydroxyl-containing organosilicon surfactant and maleic anhydride is 10-40:

100.

5. The fluorine-free, solvent-resistant foam fire extinguishing agent according to any one of claims 1 to 4, characterized in that: The hydroxyl-containing organic silicon surfactant is a hydroxyl-containing polyether-modified organic siloxane.

6. The fluorine-free, solvent-resistant foam fire extinguishing agent according to any one of claims 1 to 5, characterized in that: The fluorine-free anti-solvent foam fire extinguishing agent contains: 5-30 wt % of hydrocarbon surfactant, 0.5-5 wt % of carboxyl-modified organic silicon surfactant, 0.1-4 wt % of foam stabilizer, 1-6 wt % of cosolvent, 0-6 wt % of pH regulator and 50-80 wt % of water.

7. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 1, characterized in that: The hydrocarbon surfactant is selected from at least two of anionic hydrocarbon surfactants, cationic hydrocarbon surfactants, amphoteric hydrocarbon surfactants and nonionic hydrocarbon surfactants; Preferably, the co-solvent is selected from one or more of ethylene glycol, diethylene glycol butyl ether and isobutyl alcohol; Preferably, the pH adjuster is selected from one or more of citric acid, lactic acid, tartaric acid, malic acid, phosphoric acid and acetic acid.

8. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 7, characterized in that: The anionic hydrocarbon surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate and sodium α-olefin sulfonate; Preferably, the cationic hydrocarbon surfactant is selected from one or more of dodecyl dimethyl benzyl ammonium chloride, polyoxyethylene alkyl amide, fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether; Preferably, the amphoteric hydrocarbon surfactant is selected from one or more of cocamidopropyl betaine, N-dodecyl dimethyl betaine and 2-undecyl-N-acetoxy-N(2-hydroxyethyl)imidazoline; Preferably, the nonionic hydrocarbon surfactant is selected from one or more of alkyl glycosides, fatty alcohol polyoxyethylene ethers and alkylphenol polyoxyethylene ethers.

9. The fluorine-free, solvent-resistant foam fire extinguishing agent according to any one of claims 1 to 8, characterized in that: The fluorine-free anti-solvent foam fire extinguishing agent also contains one or more of a flame retardant, a corrosion inhibitor, an antifreeze agent, a chelating agent and a preservative.

10. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 9, characterized in that: The flame retardant is selected from one or more of potassium bicarbonate, sodium bicarbonate, diammonium hydrogen phosphate and diammonium dihydrogen phosphate; Preferably, the corrosion inhibitor is selected from one or more of sodium chromate, potassium chromate, sodium tripolyphosphate and sodium hexametaphosphate; Preferably, the antifreeze agent is selected from one or more of urea, acetamide, methanol and ethylene glycol; Preferably, the chelating agent is disodium ethylenediaminetetraacetate; Preferably, the preservative is sodium benzoate.

11. The fluorine-free, solvent-resistant foam fire extinguishing agent according to claim 1 or 10, characterized in that: The fluorine-free anti-solvent foam fire extinguishing agent contains: 5-30wt% of hydrocarbon surfactant, 0.5-5wt% of carboxyl modified silicone surfactant, 0.1-4wt% of foam stabilizer, 1-6wt% of solvent promoter, 2-8wt% of flame retardant, 2-4wt% of antifreeze agent, 0.1-0.5wt% of corrosion inhibitor, 0.5-3wt% of chelating agent, 0.5-1.5wt% of preservative, 1-6wt% of pH regulator and 50-80wt% of water.

12. A method for preparing the fluorine-free, solvent-resistant foam fire extinguishing agent according to any one of claims 1 to 11, characterized in that: The method comprises: mixing a hydrocarbon surfactant, a carboxyl-modified organic silicon surfactant, a foam stabilizer, a cosolvent and water.

13. The method according to claim 12, characterized in that The method comprises the following steps: (1) mixing a hydrocarbon surfactant, a carboxyl-modified silicone surfactant and water to obtain a first solution; (2) mixing a foam stabilizer and a co-solvent to obtain a second solution; (3) Mixing the first solution and the second solution.

14. The method according to claim 12, characterized in that Step (1) comprises: The hydrocarbon surfactant, the carboxyl-modified organic silicon surfactant, the flame retardant, the corrosion inhibitor, the antifreeze agent, the chelating agent and water are mixed to obtain a first solution.

Images