Environment-friendly foam extinguishing agent based on hydrocarbon / organic silicon compound system and preparation method of environment-friendly foam extinguishing agent

Abstract

The invention belongs to the technical field of fire extinguishing agents, and particularly relates to an environment-friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system and a preparation method of the environment-friendly foam fire extinguishing agent. The fire extinguishing agent comprises the following components in percentage by mass: 4%-8% of dodecyl glycoside APG0810, 7%-10% of cocamidopropyl betaine CAB, 3%-5% of an organosilicon surfactant Dow Corning OFX-5211, 0.2%-0.5% of nano boron nitride, 0.2%-0.4% of xanthan gum, 1%-4% of a cosolvent, 3%-10% of an antifreeze agent and the balance of water. The total amount of the dodecyl glycoside APG0810 and the cocamidopropyl betaine is not less than 13%. The environment-friendly foam extinguishing agent does not contain perfluorooctane sulfonate and perfluorooctanoic acid which are difficult to degrade, has good stability, and is simple in preparation process, low in preparation cost and suitable for extinguishing B-type oil liquid fire disasters.

Description

Technical Field

[0001] The invention belongs to the technical field of fire extinguishing agents, and particularly relates to an environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system and a preparation method thereof. Background Art

[0002] Foam fire extinguishing agent fire extinguishing is currently the most effective fire extinguishing technology for extinguishing flammable liquid fires. Foam fire extinguishing agents are divided into chemical foam fire extinguishing agents, air foam fire extinguishing agents, fluoroprotein foam fire extinguishing agents, aqueous film-forming foam fire extinguishing agents and anti-soluble foam fire extinguishing agents, etc., and have a wide range of applications. Among them, aqueous film-forming foam fire extinguishing agent (AFFF) can quickly form a layer of water film on the surface of liquid fuel. The water film and the foam layer together play the role of isolating combustibles, isolating oxygen and cooling down. Studies have found that perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), the key components of AFFF, are seriously destructive to the ecological environment. In 2009, the Stockholm Convention classified PFOA and its salts as controlled persistent organic pollutants. Therefore, the development of fluorine-free foam fire extinguishing agents that can replace perfluorooctane sulfonates is of great significance to environmental protection. At present, there are two main ways to prepare foam fire extinguishing agents that do not contain perfluorooctane sulfonates: one is to replace long-chain fluorocarbon surfactants with environmentally friendly short-chain fluorocarbon surfactants (C4-C6), which reduces the harm to the environment to a certain extent. The other is to replace long-chain fluorocarbon surfactants with environmentally friendly silicone surfactants with superior performance, reduce the surface tension of the foam solution through the hydrocarbon / silicone surfactant compound system, improve its spreading performance, and develop completely fluorine-free environmentally friendly foam fire extinguishing agents. For example, the highly efficient and environmentally friendly NP-foam fire extinguishing agent disclosed in the Chinese patent document (application number 202210396575.4) includes the following components by weight: 3-12 parts of compound surfactant, 10-150 parts of nanoparticles, 0.3-1 parts of stabilizer, 15-30 parts of dispersant, 3-9 parts of antifreeze agent, 1-10 parts of suspending agent, and the balance is water, and the total weight of each component is 1000 parts; the method makes the nanoparticles into a suspension and mixes it with a compound surfactant solution, wherein the compound surfactant is a short-chain fluorocarbon surfactant or a silicone surfactant and a hydrocarbon surfactant. A large number of nanoparticles are used in this patent, such as at least one of silicon dioxide, aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, antimony oxide, calcium carbonate, ferroferric oxide and antimony trioxide, to improve the stability of the foam, enhance the thermal insulation performance of the foam layer, and avoid the rapid collapse of the foam caused by excessive external temperature. Regarding the application of ultrafine powder in foam fire extinguishing agents, Jiang Xinsheng, Zhai Yan and others have also conducted more detailed research (Study on Thermal Stability of Ultrafine Powder Three-Phase Foam Fire Extinguishing Agents, Journal of China Safety Science, 2015, 35(12)). Specifically, they used a self-designed small-size visualized oil pool to complete the thermal stability experiment of foam oil surface with different powder types and different addition amounts. The experimental powders included hollow glass microspheres, carbon powder, 2000 mesh silica powder and bentonite. The results showed that the improvement effect of different powders on foam stability was quite different. Nano boron nitride (BN) is the simplest boron-nitrogen polymer. Nitrogen and boron form a hexagonal mesh layer. This special structure of nanoparticles has not been used in foam fire extinguishing agents at present. Summary of the invention

[0003] The purpose of the present invention is to provide an environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon composite system and a preparation method thereof. The foam fire extinguishing agent of the present invention uses nano boron nitride as a powder foam stabilizer, and cooperates with the selection of xanthan gum and surfactants to effectively improve the foam stability, and achieves no pollution to the environment and good safety performance without using fluorocarbon surfactants, and has an excellent fire extinguishing effect.

[0004] In order to achieve the purpose of the present invention, the technical solution adopted is:

[0005] An environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system, the raw material composition includes, by mass percentage:

[0006]

[0007]

[0008] The balance is water.

[0009] Among them, the hydrocarbon surfactant is a combination of nonionic surfactant dodecyl glucoside APG0810 and zwitterionic surfactant cocamidopropyl betaine CAB, and the silicone surfactant is Dow Corning OFX-5211. Among them, the nonionic surfactant dodecyl glucoside APG0810 is a green, environmentally friendly and pollution-free surfactant, and the addition amount is generally 4% to 8%. Although the addition amount exceeds this range, a lower surface tension and a higher foam height can be obtained, the 25% liquid separation time is short. The addition amount of APG0810 is preferably 4% to 6%, and more preferably 5%. The zwitterionic surfactant cocamidopropyl betaine CAB is an excellent amphoteric surfactant with low toxicity and biodegradability, and is environmentally friendly. The addition amount is generally 7% to 10%. The compatibility of CAB and APG0810 is conducive to obtaining a foam fire extinguishing agent with a lower viscosity, and the preferred addition amount is 8% to 10%, and more preferably 8%. The organosilicon surfactant Dow Corning OFX-5211 has low surface tension, good chemical stability and is non-toxic, and has good dispersion stability. The preferred addition amount is 4% to 5%, and more preferably 5%.

[0010] Nano-particle boron nitride BN has a particle size range of 50 to 100 nm. Its layered structure can improve the mechanical barrier (steric hindrance) effect around the bubble interface, reduce the coalescence rate of adjacent bubble surfaces, effectively extend the foam separation time, improve the foam liquid holding capacity, and reduce foam coarsening.

[0011] The foam stabilizer is preferably xanthan gum, which can increase the viscosity of the solution, enhance the stability of the foam, and improve the anti-burning performance.

[0012] The dosage relationship between nano boron nitride and xanthan gum influences and restricts each other, and is affected by the above-mentioned surfactant system. The change in the dosage of the two will have a greater impact on the flame retardant properties. Preferably, the addition amount of APG0810 is 4% to 6%, the addition amount of cocamidopropyl betaine CAB is 8% to 10%, the addition amount of silicone surfactant Dow Corning OFX-5211 is 4% to 5%, the dosage of nano boron nitride is 0.2% to 0.3%, and the dosage of xanthan gum is 0.35 to 0.4%.

[0013] The cosolvent may be a cosolvent commonly used in the art, for example, a combination of urea and diethylene glycol monobutyl ether, wherein the mass content of urea in the environmentally friendly foam fire extinguishing agent is 0.5-3%, and the mass content of diethylene glycol monobutyl ether is 0.4-1%. The cosolvent can not only play a solubilizing role, but also reduce the freezing point of the fire extinguishing agent product, and improve the stability, dispersibility and film-forming property of the fire extinguishing agent.

[0014] The antifreeze agent may be a commonly used cosolvent in the art, for example, ethylene glycol.

[0015] The present invention also provides a method for preparing the above-mentioned environmentally friendly foam fire extinguishing agent, which comprises the following steps:

[0016] (1) fully dispersing a hydrocarbon nonionic surfactant, a zwitterionic surfactant and nano-boron nitride in water to prepare a mixed solution A;

[0017] (2) fully dispersing the organosilicon surfactant and xanthan gum in water to prepare a mixed solution B;

[0018] (3) mixing diethylene glycol monobutyl ether and ethylene glycol to form solution C;

[0019] (4) Under slow stirring conditions, solution A and solution B are mixed and fully stirred to disperse, and then slowly added to solution C, and stirred rapidly to form the environmentally friendly foam fire extinguishing agent.

[0020] In the present invention, the fire extinguishing agent is preferably mixed with water in a volume ratio of 6:94 to form a solution, which is conducive to fire extinguishing.

[0021] Compared with the prior art, the environmentally friendly foam fire extinguishing agent and the preparation method thereof of the present invention have the following advantages:

[0022] The raw materials used in the present invention have good biodegradability and little environmental pollution; the fire extinguishing agent will not have harmful adverse effects on the human environment after being released. The present invention utilizes a compound system of environmentally friendly, highly surface-active nonionic and zwitterionic hydrocarbon surfactants and a highly dispersed and stable organic silicon surfactant to replace the fluorocarbon surfactants in the traditional aqueous film-forming foam fire extinguishing agent, develops an environmentally friendly foam fire extinguishing agent suitable for extinguishing flammable liquid fires, fundamentally solves the ecological problems caused by the fluorocarbon surfactants in the traditional AFFF, and simultaneously ensures that the fire extinguishing agent maintains excellent stability by optimizing the components and ratios.

[0023] The hydrocarbon surfactant of the present invention is alkyl polyglycoside APG0810 and cocamidopropyl betaine CAB, and the silicone surfactant is Dow Corning OFX-5211. The nonionic surfactant alkyl polyglycoside APG0810 has excellent foaming performance, good biodegradability and no environmental pollution; the zwitterionic surfactant cocamidopropyl betaine CAB has good strong electrolyte resistance; Dow Corning OFX-5211 is beneficial to reducing surface tension. The foam fire extinguishing agent formed by the combination of the hydrocarbon / silicone surfactants can form a dense foam layer on the surface of the burning object, which has a further barrier effect on the outside air, and can not only have a good cooling effect, but also improve the fire extinguishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram of the fire extinguishing process of the fire extinguishing agent prepared in Example 3.

[0025] Figure 2 The SEM image of nano-boron nitride used in the examples and comparative examples has an average particle size of 50 nm. DETAILED DESCRIPTION

[0026] In order to further understand the purpose, content and advantages of the present invention, some embodiments of the present invention are now described in detail as follows, but it is not limited to the following examples, and it is freely matched according to actual conditions. The endpoints and any values ​​of the scope disclosed in this article are not limited to this accurate scope and value. For numerical ranges, between the endpoint values ​​of each scope, between the endpoint values ​​of each scope and a separate point value, and between the separate point values, one or more new numerical ranges can be combined with each other, and these numerical ranges should be considered as specifically disclosed in this article.

[0027] The present invention provides an embodiment of an environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system. The environmentally friendly foam fire extinguishing agent, in terms of mass percentage, comprises the following raw materials: 13% to 18% hydrocarbon surfactant, 3% to 5% organosilicon surfactant Dow Corning OFX-5211, 0.2% to 0.5% nano boron nitride, 0.2% to 0.4% xanthan gum, 1% to 4% cosolvent, 3% to 10% antifreeze agent, and the balance is water. Among them, it is a combination of nonionic surfactant dodecyl glucoside APG0810 and zwitterionic surfactant cocamidopropyl betaine CAB, the mass content of nonionic surfactant dodecyl glucoside APG0810 in the environmentally friendly foam fire extinguishing agent is 4% to 8%, and the mass content of cocamidopropyl betaine CAB is 7% to 10%. Under the above ratio, better fire extinguishing performance can be achieved, and the 25% liquid separation time is not less than 2.1 minutes, and the fire extinguishing time does not exceed 2.2 minutes.

[0028] In some preferred embodiments of the present invention, the amount of APG0810 added to the environmentally friendly foam fire extinguishing agent is further controlled to be 4% to 6%, the amount of cocamidopropyl betaine CAB is 8% to 10%, the amount of silicone surfactant Dow Corning OFX-5211 is 4% to 5%, the amount of nano-boron nitride is 0.2% to 0.3%, and the amount of xanthan gum is 0.35 to 0.4%. The 25% liquid separation time can be extended to more than 3.6 minutes, the fire extinguishing time can be reduced to less than 1.5 minutes, the foaming height is not less than 188 mm, and the viscosity does not exceed 1.1 mPa·s.

[0029] The viscosity of the embodiments of the present invention is tested by LVDV-2T Brookfield viscometer. In the embodiments of the present invention, the viscosity of the solution to be tested is less than 15mPa·s, so a No. 0 rotor is selected and the speed is set to 60 rpm. Each group of embodiments is tested at room temperature. After the rotor is wetted with the solution to be tested in the embodiment, 20-30 ml of the solution to be tested is added, and the measurement is started. After the reading is stable, the viscosity value is recorded.

[0030] The present invention is further described in detail below with more specific examples and comparative examples. The specific examples are only used for illustrative description and should not be construed as limiting the present invention.

[0031] Example 1

[0032] The total weight of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.2% of xanthan gum, 0.2% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.6% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and stirred thoroughly; after the mixed solutions A and B are stirred evenly, C is slowly added to A, and finally the remaining 34.6% deionized water is added.

[0033] Example 2

[0034] The total weight of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.2% of xanthan gum, 0.5% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.3% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and stirred thoroughly; after the mixed solutions A and B are stirred evenly, C is slowly added to A, and finally the remaining 34.3% deionized water is added.

[0035] Example 3

[0036] The total weight of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.4% of xanthan gum, 0.2% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.3% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and stirred thoroughly; after the mixed solutions A and B are stirred evenly, C is slowly added to A, and finally the remaining 34.4% deionized water is added.

[0037] Example 4

[0038] The total weight of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.4% of xanthan gum, 0.5% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.3% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and fully stirred; after the mixed solutions A and B are evenly stirred, C is slowly added to A, and finally the remaining 34.1% deionized water is added.

[0039] Example 5

[0040] The total weight of the fire extinguishing agent comprises 8% of alkyl polyglucoside APG0810 surfactant, 5% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.2% of xanthan gum, 0.2% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.6% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and stirred thoroughly; after the mixed solutions A and B are stirred evenly, C is slowly added to A, and finally the remaining 34.6% deionized water is added.

[0041] Example 6

[0042] The total weight of the fire extinguishing agent comprises 8% of alkyl polyglucoside APG0810 surfactant, 10% of cocamidopropyl betaine CAB surfactant, 3% of Dow Corning OFX-5211 silicone surfactant, 0.4% of xanthan gum, 0.5% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 71.1% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; the mixed solution B is slowly added to the mixed solution A under stirring conditions and stirred thoroughly; after the mixed solutions A and B are stirred evenly, C is slowly added to A, and finally the remaining 31.1% deionized water is added.

[0043] Comparative Example 1

[0044] The total mass of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 75% of deionized water; alkyl polyglucoside APG0810 and cocamidopropyl betaine CAB are added into 20% of deionized water and stirred fully, so that alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and water are fully mixed to form a mixed solution A; the silicone surfactant OFX-5211 is fully stirred with 20% of deionized water to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added into a beaker in sequence to form a solution C; the mixed solution B is slowly added into the mixed solution A under stirring conditions and stirred fully; after the mixed solutions A and B are stirred evenly, C is slowly added into A, and finally the remaining 35% of deionized water is added.

[0045] Comparative Example 2

[0046] The total weight of the fire extinguishing agent comprises 5% of alkyl polyglucoside APG0810 surfactant, 8% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.4% of xanthan gum, 0.2% of nano-alumina, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.4% of deionized water; alkyl polyglucoside APG0810, cocamidopropyl betaine CAB and nano-alumina are added into 20% of deionized water and stirred thoroughly to make alkyl polyglucoside APG0810 PG0810, cocamidopropyl betaine CAB, nano-alumina and water are fully mixed to form a mixed solution A; silicone surfactant OFX-5211, xanthan gum and 20% deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added to a beaker in sequence to form a solution C; mixed solution B is slowly added to mixed solution A under stirring conditions and fully stirred; after the mixed solutions A and B are evenly stirred, C is slowly added to A, and finally the remaining 34.4% deionized water is added.

[0047] Comparative Example 3

[0048] The total mass of the fire extinguishing agent comprises 13% of alkyl polyglucoside APG0810 surfactant, 5% of Dow Corning OFX-5211 organosilicon surfactant, 0.4% of xanthan gum, 0.2% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.4% of deionized water; alkyl polyglucoside APG0810 and nano boron nitride are added into 20% deionized water and stirred fully, so that alkyl polyglucoside APG0810, nano boron nitride and water are fully mixed to form a mixed solution A; organosilicon surfactant OFX-5211, xanthan gum and 20% deionized water are stirred fully to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added into a beaker in sequence to form a solution C; under stirring, the mixed solution B is slowly added into the mixed solution A and stirred fully; after the mixed solutions A and B are stirred evenly, C is slowly added into A, and finally the remaining 34.4% of deionized water is added.

[0049] Comparative Example 4

[0050] The total weight of the fire extinguishing agent comprises 13% of cocamidopropyl betaine CAB surfactant, 5% of Dow Corning OFX-5211 silicone surfactant, 0.4% of xanthan gum, 0.2% of nano boron nitride, 3% of urea, 3% of ethylene glycol, 1% of diethylene glycol monobutyl ether and 74.4% of deionized water; cocamidopropyl betaine CAB and nano boron nitride are added into 20% of deionized water and stirred fully, so that cocamidopropyl betaine CAB, nano boron nitride and water are fully mixed to form a mixed solution A; silicone surfactant OFX-5211, xanthan gum and 20% of deionized water are fully stirred to form a mixed solution B; urea, diethylene glycol monobutyl ether and ethylene glycol are added into a beaker in sequence to form a solution C; under stirring, the mixed solution B is slowly added into the mixed solution A and stirred fully; after the mixed solutions A and B are stirred evenly, C is slowly added into A, and finally the remaining 34.4% of deionized water is added.

[0051] A fire extinguishing test was conducted using an oil pan of 0.5 m×0.5 m×0.5 m. Before the test began, 3 L of gasoline fuel was placed in the oil pan, and the test personnel used a backpack foam fire extinguishing agent equipment (Dalian Puan Fire Equipment Co., Ltd.) to extinguish the fire. After the oil pan was pre-burned for 1 minute, the fire extinguishing began, the fire extinguishing time was recorded, and the foam fire extinguishing process was photographed. The specific foam solution performance parameter test results are shown in Table 1. When conducting the following performance test, the foam fire extinguishing agent prepared in each embodiment was compounded in advance at a mass ratio of 6:94 with water.

[0052] Table 1 Performance test results

[0053]

[0054] Table 2 Ingredients of each embodiment and comparative example

[0055]

[0056]

[0057] It can be seen from the above embodiments that the environmentally friendly foam fire extinguishing agent includes the following components in terms of mass percentage: 13% to 18% hydrocarbon surfactant, 3% to 5% silicone surfactant, 0.2% to 0.5% nano boron nitride, 0.2% to 0.4% xanthan gum, 1% to 4% cosolvent, 3% to 10% antifreeze agent and the balance water. Through the interaction of the above-mentioned components, the fire extinguishing agent has excellent foaming ability and foam stability. The raw materials used in the fire extinguishing agent will not pollute the environment. The results show that the 25% liquid separation time of the fire extinguishing agent is 1.6 to 3.8 minutes; the fire extinguishing time is 1.3 to 2.2 minutes; the foaming height is 177 to 195 mm; the surface tension is 22.9 to 24.8 mN / m; and the viscosity is 1.0 to 1.8 mPa·s. Among them, the comprehensive performance of Examples 2, 3, and 4, especially the fire extinguishing performance, is better, and is better than Comparative Examples 1 to 4. The experiment also found that when the amount of xanthan gum added as a foam stabilizer is increased to 0.6% on the basis of Example 4, it is not conducive to fire extinguishing in the actual fire extinguishing process. This is mainly because when the amount of xanthan gum added exceeds 0.4%, the viscosity of the foam solution system will increase, which is not conducive to the spreading of the foam during the fire extinguishing process. In the oil pan, the foam cannot be completely spread on the oil surface, and there will be edge fire near the edge of the oil pan. When xanthan gum is used in combination with nano-boron nitride, the preferred addition amount is 0.35% to 0.4%.

[0058] In addition, the following orthogonal experiment was conducted on surfactants. The experimental method was to prepare the surfactant composite solution according to the mass ratio shown in the table, with the balance being water. The specific experimental results are shown in Table 3.

[0059] Table 3 Surfactant compounding orthogonal experiment and results

[0060]

[0061]

[0062] Regarding nanoparticles, the following experiment was also conducted. The experimental method was: prepare a suspension, control 5wt% of alkyl polyglycoside APG0810 surfactant, 8wt% of cocamidopropyl betaine CAB surfactant, 5wt% of Dow Corning OFX-5211 silicone surfactant, add nanoparticles according to the concentration in the table, and the balance is water. The specific results are shown in Table 4. The average particle size of the nanoparticles is 50nm.

[0063] Table 4 Foam height and liquid separation time of different nanoparticles on hydrocarbon organosilicon surfactant system

[0064]

[0065] Experimental verification shows that when only nano-particle boron nitride is added, the foam height and liquid separation time of the composite system are optimal when the boron nitride addition amount is 0.5wt%; but when the foam stabilizer xanthan gum is added, under the synergistic effect of boron nitride and xanthan gum, the amount of nano-boron nitride is preferably 0.2% to 0.3%, and the most preferred amount is 0.2%, as the foam performance and fire extinguishing performance of the composite system are optimal.

[0066] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system, characterized in that: The environmentally friendly foam fire extinguishing agent comprises, by weight percentage, 13% to 18% hydrocarbon surfactant, 3% to 5% organosilicon surfactant Dow Corning OFX-5211, 0.2% to 0.5% nano boron nitride, 0.2% to 0.4% xanthan gum, 1% to 4% cosolvent, 3% to 10% antifreeze agent, and the balance is water; Among them, it is a combination of non-ionic surfactant dodecyl glucoside APG0810 and zwitterionic surfactant cocamidopropyl betaine CAB. The mass content of non-ionic surfactant dodecyl glucoside APG0810 in the environmentally friendly foam fire extinguishing agent is 4% to 8%, and the mass content of cocamidopropyl betaine CAB is 7% to 10%.

2. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The mass content of nonionic surfactant dodecyl polyglycoside APG0810 in the environmentally friendly foam fire extinguishing agent is 4% to 6%.

3. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The mass content of nonionic surfactant dodecyl polyglycoside APG0810 in the environmentally friendly foam fire extinguishing agent is 5%.

4. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The mass content of cocamidopropyl betaine CAB in the environmentally friendly foam fire extinguishing agent is 8% to 10%.

5. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The addition amount of the silicone surfactant Dow Corning OFX-5211 is 4% to 5%.

6. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The amount of APG0810 added to the environmentally friendly foam fire extinguishing agent is 4% to 6%, the amount of cocamidopropyl betaine CAB is 8% to 10%, the amount of silicone surfactant Dow Corning OFX-5211 is 4% to 5%, the amount of nano boron nitride is 0.2% to 0.3%, and the amount of xanthan gum is 0.35% to 0.4%.

7. The environmentally friendly foam fire extinguishing agent based on hydrocarbon / organic silicon compound system according to claim 1, characterized in that: The co-solvent is a combination of urea and diethylene glycol monobutyl ether, the mass content of urea in the environmentally friendly foam fire extinguishing agent is 0.5-3%, and the mass content of diethylene glycol monobutyl ether is 0.4-1%; the antifreeze agent is ethylene glycol.

8. The method for preparing an environmentally friendly foam fire extinguishing agent based on a hydrocarbon / organic silicon compound system according to any one of claims 1 to 7, characterized in that: The steps include: (1) fully dispersing a hydrocarbon nonionic surfactant, a zwitterionic surfactant and nano-boron nitride in water to prepare a mixed solution A; (2) fully dispersing the organosilicon surfactant and xanthan gum in water to prepare a mixed solution B; (3) mixing diethylene glycol monobutyl ether and ethylene glycol to form solution C; (4) Under slow stirring conditions, solution A and solution B are mixed and fully stirred to disperse, and then slowly added to solution C, and stirred rapidly to form the environmentally friendly foam fire extinguishing agent.

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