Petrochemical engineering water-based special fire extinguishing agent with fireproof function

Abstract

The invention discloses a petrochemical engineering water-based special fire extinguishing agent with a fireproof function, belongs to the technical field of fire extinguishing agents, and aims to solve the technical problem that a fire extinguishing agent in the prior art needs to have flame-retardant, environment-friendly, fireproof and fire extinguishing performances. The preparation method of the petrochemical engineering water-based special fire extinguishing agent with the fireproof function comprises the steps that amino silane reacts with 1, 2-epoxy chlorobutane, and an intermediate I is obtained; reacting epoxy modified nano silicon dioxide with the intermediate I in a nitrogen atmosphere to obtain an intermediate II; in an Ar gas environment, polytetrahydrofuran ether glycol, the intermediate II, potassium carbonate and absolute ethyl alcohol are mixed, heated and subjected to a reaction, and the surfactant is obtained; and the surfactant, the flame retardant, the stabilizer, the foaming agent, the urea, the cosolvent and the deionized water are mixed, and the petrochemical engineering water-based special fire extinguishing agent with the fireproof function is obtained. The petrochemical engineering water-based special fire extinguishing agent with the fireproof function is high in fire extinguishing efficiency and wide in application range, and has flame-retardant, environment-friendly and fireproof performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing agents, and in particular to a petrochemical water-based special fire extinguishing agent with fire prevention function. Background Art

[0002] In recent years, with the continuous development of social production and life, the application of petrochemical products has become increasingly widespread, and their usage has continued to increase significantly. Correspondingly, all aspects of oil production, from extraction and processing to storage, have been steadily increasing. Petrochemical enterprises involve a large amount of flammable and explosive liquids in the upstream and downstream links. Once a fire occurs, it is very easy to cause catastrophic fires and explosions and major environmental pollution. Petrochemical fires are characterized by fierce flames, rapid spread, and huge damage. Once they occur, they are very likely to cause significant casualties and property losses. If the fire extinguishing agents used are not of good performance, it will be difficult to effectively control the spread of the fire. How to quickly and effectively control and extinguish petrochemical fires and minimize the secondary disasters caused by petrochemical fires has gradually become a research focus.

[0003] Currently, the practical application of fire extinguishing agents for extinguishing Class B fires involving diesel, gasoline, and lubricating oils has many unsatisfactory aspects. From an environmental perspective, AFFF, due to its presence of fluorocarbon surfactants, primarily perfluorooctane sulfonate (PFOS), poses significant environmental risks and exhibits poor environmental performance. Furthermore, fire extinguishing effectiveness often leads to rekindling after extinguishing, making it difficult to fundamentally eliminate fire hazards. More critically, these fire extinguishing agents lack fire protection and are unable to fully play their role in fire prevention. Therefore, the petrochemical industry urgently needs a fire extinguishing agent that is highly effective in flame retardancy, environmental protection, fire prevention, and fire extinguishing properties. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a petrochemical water-based special fire extinguishing agent with fire prevention function, which effectively overcomes the shortcomings of conventional Class B fire extinguishing agents, meets the special needs of the petrochemical industry for fire safety, and also has high-efficiency flame retardant and environmentally friendly properties, thereby expanding the scope of application.

[0005] In order to achieve the above object, the present invention provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0006] Step (1) mixing aminosilane, 1,2-epoxychlorobutane and anhydrous ethanol, heating, reacting, filtering, washing and drying after the reaction is completed to obtain intermediate I;

[0007] Step (2) under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed, heated, reacted, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0008] Step (3) in an Ar gas environment, polytetrahydrofuran ether glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed, heated, reacted, and after the reaction is completed, vacuum distilled and dried to obtain a surfactant;

[0009] Step (4) The surfactant, flame retardant, stabilizer, foaming agent, urea, cosolvent and deionized water are mixed to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0010] Preferably, the preparation method of epoxy-modified nano-silica comprises the following steps:

[0011] Anhydrous ethanol, nano-silica and γ-(2,3-epoxypropoxy)propyltrimethoxysilane are mixed evenly and reacted. After the reaction is completed, the mixture is filtered, washed and dried to obtain epoxy-modified nano-silica.

[0012] Wherein, the mass ratio of anhydrous ethanol, nano-silica and γ-(2,3-epoxypropoxy)propyltrimethoxysilane is (1200-2400):(20-30):(8-10);

[0013] The reaction temperature is 60-80°C and the reaction time is 3-5h.

[0014] Preferably, in step (1), the mass ratio of aminosilane, 1,2-epoxychlorobutane and anhydrous ethanol is (8-10):(20-40):(50-90).

[0015] Preferably, in step (2), the mass ratio of epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide is (40-60):(120-200):(600-1000).

[0016] Preferably, in step (3), the mass ratio of polytetramethylene ether glycol, intermediate II, potassium carbonate and anhydrous ethanol is (300-500):(90-150):(4-8):(1200-2000).

[0017] Preferably, the mass ratio of surfactant, flame retardant, stabilizer, foaming agent, urea, cosolvent and deionized water is (2.1-4.4):(2.4-4.8):(1.2-1.6):(2.2-5.2):(2.8-3.6):(0.3-0.5):(60-96).

[0018] Preferably, in step (1), the reaction temperature is 60-70° C., and the reaction time is 6-9 h.

[0019] Preferably, in step (2), the reaction temperature is 70-90° C., and the reaction time is 30-36 h.

[0020] Preferably, in step (3), the reaction temperature is 50-60° C., and the reaction time is 36-48 h.

[0021] Preferably, the aminosilane is at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, methyl(γ-aminopropyl)diethoxysilane, N,N'-bis(β-aminoethyl)-γ-aminopropyltrimethoxysilane and N-2-(aminoethyl)-3-aminopropyltrimethoxysilane.

[0022] Preferably, the flame retardant is ammonium dihydrogen phosphate.

[0023] Preferably, the blowing agent is an alkyl glycoside.

[0024] Preferably, the cosolvent is diethylene glycol butyl ether.

[0025] Preferably, the stabilizer is any one of xanthan gum, HPAM, and CMC.

[0026] A petrochemical water-based special fire extinguishing agent with fire-proof function is prepared by the preparation method of the petrochemical water-based special fire extinguishing agent with fire-proof function.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. In this invention, the addition of aminosilane to the fire extinguishing agent further reduces surface tension, allowing the agent to spread better on the oil surface, thereby increasing the spreading coefficient. Lower surface tension and a higher spreading coefficient help the fire extinguishing agent solution cover the burning surface more quickly, isolating it from oxygen, preventing the spread of fire, and shortening the extinguishing time. Furthermore, the greater chemical bond energy of silicon-oxygen bonds improves thermal stability. The nanosilica particles added to this invention enhance foam stability. Nanosilica particles are inorganic, heat-resistant particles that form a dense silicate protective layer during combustion, isolating heat and oxygen, providing a highly effective flame retardant effect. The amino groups in the aminosilane react with the epoxy groups in 1,2-epoxychlorobutane to produce Intermediate I. Intermediate I contains chloro and hydroxyl groups, and the hydroxyl groups in the aminosilane react with the epoxy groups in epoxy-modified nanosilica to produce Intermediate II. The chloro groups in Intermediate II react with the hydroxyl groups in polytetramethylene glycol under the catalysis of potassium carbonate to produce ether groups. The resulting surfactant is halogen-free and environmentally friendly. In the present invention, epoxy-modified nano-silica is incorporated into the surfactant chain, further increasing the foam's stability and extending the liquid separation time. This allows for a longer period of fire extinguishing and fire resistance, extending the fire resistance time. The polytetrahydrofuran ether glycol in the present invention, as a hydrophilic-hydrophobic amphiphilic substance, can reduce surface tension and form a water film on the fuel surface, rapidly isolating oxygen and inhibiting fuel evaporation. The long-chain polyether structure it contains can enhance the foam's mechanical stability, slowing its burst rate and facilitating fire extinguishing. Therefore, the surfactant prepared by the present invention can improve the foam's covering power and fire resistance.

[0029] 2. The ammonium dihydrogen phosphate in the present invention is a water-soluble flame retardant. During combustion, the ammonium dihydrogen phosphate decomposes upon heating, releasing substances such as ammonia and phosphoric acid. The ammonia dilutes the oxygen concentration in the combustion zone, while the phosphoric acid and its decomposition products form a coating on the surface of the burning material, preventing oxygen from coming into contact with the burning material, thus providing a flame retardant effect, effectively shortening the fire extinguishing time and improving the fire resistance. Urea in the present invention is also an anti-burning agent that improves the fire resistance. The gases produced during decomposition during combustion dilute the oxygen concentration in the combustion zone, enhancing the flame retardant effect. The alkyl glycoside in the present invention not only foams but also reduces surface tension. The alkyl glycoside and surfactant synergistically produce a rich and stable foam, which forms an insulating layer on the burning surface, isolating it from air, lowering the temperature in the combustion zone, and reducing heat transfer to unburned fuel. This not only facilitates rapid fire extinguishing and shortens the fire extinguishing time, but the stable foam structure also increases the liquid separation time, prolonging the effective action of the foam, thereby improving the fire resistance and anti-reignition ability, and imparting fireproofing properties to the fire extinguishing agent. At the same time, the deionized water added in the present invention absorbs a large amount of heat during the evaporation process, reducing the temperature of the burning material to below the ignition point, thereby achieving the purpose of extinguishing the fire.

[0030] 3. During the fire extinguishing process, the petrochemical water-based fire extinguishing agent with fire-proofing function prepared by the present invention rapidly spreads on the surface of the flammable liquid due to its excellent spreading properties, and forms a thin water film on the liquid surface, thereby preventing outside air from contacting the flammable liquid and achieving an isolation effect. At the same time, the water film can quickly cool the fuel surface, effectively suppressing the spread of the flame. In addition, the combustion of the fuel causes the water in the foam to continuously evaporate into water vapor at high temperatures, which mixes with the oxygen above the flammable liquid to achieve a dilution effect, thereby interfering with the combustion of the flame. The flame retardant effects of the ammonium dihydrogen phosphate, urea, and nano-silica further hinder the progress of combustion and curb its spread. Taking all of the above aspects into consideration, the petrochemical water-based fire extinguishing agent with fire-proof function achieves a more excellent fire extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the preparation process of the petrochemical water-based special fire extinguishing agent with fire-proof function in the present invention;

[0032] Figure 2 Schematic diagram of the reaction for preparing intermediate I in the present invention;

[0033] Figure 3 Schematic diagram of the reaction for preparing intermediate II in the present invention;

[0034] Figure 4 Schematic diagram of the reaction for preparing surfactants in the present invention;

[0035] Figure 5 This is a bar graph showing the surface tension test results of the petrochemical water-based special fire extinguishing agents with fire-proof function in Examples 1-5 and Comparative Examples 1-4 of the present invention;

[0036] Figure 6 This is a bar graph showing the fire extinguishing time test results of the petrochemical water-based special fire extinguishing agents with fire-proof functions in Examples 1-5 and Comparative Examples 1-4 of the present invention;

[0037] Figure 7 This is a bar chart showing the test results of 25% burning time of the petrochemical water-based special fire extinguishing agents with fireproofing function in Examples 1-5 and Comparative Examples 1-4 of the present invention. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0041] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8:20:50, reacted at 60° C. for 9 h, filtered, washed with deionized water, and dried at 70° C. for 6 h to obtain intermediate I;

[0042] Step (2) Under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed in a mass ratio of 40:120:600, reacted at 70°C for 36 hours, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0043] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 300:90:4:1200, reacted at 50°C for 48 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 45°C for 5 hours, and dried at 50°C for 6 hours to obtain a surfactant;

[0044] Step (4) The surfactant, ammonium dihydrogen phosphate, xanthan gum, alkyl glycoside, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 2.1:2.4:1.2:2.2:2.8:0.3:60 and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0045] Example 2

[0046] This embodiment provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0047] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8.5:25:60, reacted at 62° C. for 8.3 h, filtered, washed with deionized water, and dried at 75° C. for 5.5 h to obtain intermediate I;

[0048] Step (2) Under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed in a mass ratio of 45:140:700, reacted at 75° C. for 34.5 h, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0049] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 350:105:5:1400, reacted at 52° C. for 45 hours, and after the reaction is completed, vacuum distillation is performed at 0.08 MPa and 47° C. for 4.5 hours, and dried at 52° C. for 5.5 hours to obtain a surfactant;

[0050] Step (4) The surfactant, ammonium dihydrogen phosphate, xanthan gum, alkyl glycoside, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 2.7:3:1.3:2.9:3:0.35:69 and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0051] Example 3

[0052] This embodiment provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0053] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 9:30:70, reacted at 65° C. for 7.5 h, filtered, washed with deionized water, and dried at 80° C. for 5 h to obtain intermediate I;

[0054] Step (2) Under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed in a mass ratio of 50:160:800, reacted at 80° C. for 33 h, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0055] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 400:120:6:1600, reacted at 55°C for 42 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 50°C for 4 hours, and dried at 55°C for 5 hours to obtain a surfactant;

[0056] Step (4) surfactant, ammonium dihydrogen phosphate, xanthan gum, alkyl glycoside, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 3.2:3.6:1.4:3.7:3.2:0.4:78, and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0057] Example 4

[0058] This embodiment provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0059] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 9.5:35:80, reacted at 67° C. for 6.8 h, filtered, washed with deionized water, and dried at 85° C. for 4.5 h to obtain intermediate I;

[0060] Step (2) Under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed in a mass ratio of 55:180:900, reacted at 85° C. for 31.5 h, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0061] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 450:135:7:1800, reacted at 57° C. for 39 hours, and after the reaction is completed, vacuum distillation is performed at 0.08 MPa and 52° C. for 3.5 hours, and dried at 57° C. for 4.5 hours to obtain a surfactant;

[0062] Step (4) surfactant, ammonium dihydrogen phosphate, xanthan gum, alkyl glycoside, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 3.7:4.2:1.5:4.5:3.4:0.45:87, and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0063] Example 5

[0064] This embodiment provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0065] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 10:40:90, reacted at 70° C. for 6 h, filtered, washed with deionized water, and dried at 90° C. for 4 h to obtain intermediate I;

[0066] Step (2) under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide were mixed in a mass ratio of 60:200:1000, reacted at 90° C. for 30 h, and after the reaction was completed, rotary evaporation was performed to obtain intermediate II;

[0067] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 500:150:8:2000, reacted at 60°C for 36 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 55°C for 3 hours, and dried at 60°C for 4 hours to obtain a surfactant;

[0068] Step (4) surfactant, ammonium dihydrogen phosphate, xanthan gum, alkyl glycoside, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 4.4:4.8:1.6:5.2:3.6:0.5:96, and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0069] Example 6

[0070] This embodiment provides a method for preparing epoxy-modified nano-silica, comprising the following steps:

[0071] Anhydrous ethanol, nano-silica, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane were mixed in a mass ratio of 1200:20:8, reacted at 60°C for 5 hours, and after the reaction was completed, centrifuged, washed with deionized water, and dried at 95°C for 4 hours to obtain epoxy-modified nano-silica.

[0072] Comparative Example 1

[0073] This comparative example provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0074] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8:20:50, reacted at 60° C. for 9 h, filtered, washed with deionized water, and dried at 70° C. for 6 h to obtain intermediate I;

[0075] Step (2) Under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed in a mass ratio of 40:120:600, reacted at 70°C for 36 hours, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II;

[0076] Step (3) In an Ar gas environment, polytetramethylene glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 300:90:4:1200, reacted at 50°C for 48 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 45°C for 5 hours, and dried at 50°C for 6 hours to obtain a surfactant;

[0077] Step (4) The surfactant, ammonium dihydrogen phosphate, xanthan gum, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 2.1:2.4:1.2:2.8:0.3:62.2, and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0078] Comparative Example 2

[0079] This comparative example provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0080] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8:20:50, reacted at 60° C. for 9 h, filtered, washed with deionized water, and dried at 70° C. for 6 h to obtain intermediate I;

[0081] Step (2) In an Ar gas environment, polytetramethylene glycol, intermediate I, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 300:90:4:1200, reacted at 50°C for 48 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 45°C for 5 hours, and dried at 50°C for 6 hours to obtain a surfactant;

[0082] Step (3) surfactant, epoxy-modified nano-silica, ammonium dihydrogen phosphate, xanthan gum, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 1.6:0.5:2.4:1.2:2.8:0.3:62.2, and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0083] Comparative Example 3

[0084] This comparative example provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0085] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8:20:50, reacted at 60° C. for 9 h, filtered, washed with deionized water, and dried at 70° C. for 6 h to obtain intermediate I;

[0086] Step (2) In an Ar gas environment, polytetramethylene glycol, intermediate I, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 300:90:4:1200, reacted at 50°C for 48 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 45°C for 5 hours, and dried at 50°C for 6 hours to obtain a surfactant;

[0087] Step (3) The surfactant, ammonium dihydrogen phosphate, xanthan gum, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 1.6:2.4:1.2:2.8:0.3:62.7 and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0088] Comparative Example 4

[0089] This comparative example provides a method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, comprising the following steps:

[0090] Step (1) γ-aminopropyltriethoxysilane, 1,2-epoxychlorobutane and anhydrous ethanol were mixed in a mass ratio of 8:20:50, reacted at 60° C. for 9 h, filtered, washed with deionized water, and dried at 70° C. for 6 h to obtain intermediate I;

[0091] Step (2) In an Ar gas environment, polytetramethylene glycol, intermediate I, potassium carbonate and anhydrous ethanol are mixed in a mass ratio of 300:90:4:1200, reacted at 50°C for 48 hours, and after the reaction is completed, vacuum distilled at 0.08 MPa and 45°C for 5 hours, and dried at 50°C for 6 hours to obtain a surfactant;

[0092] Step (3) The surfactant, xanthan gum, urea, diethylene glycol butyl ether and deionized water are mixed in a mass ratio of 1.6:1.2:2.8:0.3:65.1 and stirred evenly to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

[0093] The epoxy-modified nano-silica in Examples 1-5 of the present invention and Comparative Examples 1-2 all adopt the epoxy-modified nano-silica prepared in Example 6.

[0094] In the embodiments and comparative examples of the present invention, nano-silica is from Shanghai Aladdin Biochemical Technology Co., Ltd.; γ-aminopropyltriethoxysilane is from Shanghai Aladdin Biochemical Technology Co., Ltd.; 1,2-epoxychlorobutane is from Shanghai Haohong Biomedicine Technology Co., Ltd., CAS No.: 13067-79-3; polytetramethylene ether glycol is from Guangzhou Ruishi Biotechnology Co., Ltd., with a molecular weight of 1000 and a content of ≥99%; ammonium dihydrogen phosphate is from Suzhou Qianxing Chemical Co., Ltd.; and xanthan gum is from Guangzhou Huiding Food Co., Ltd.

[0095] Performance testing:

[0096] The petrochemical water-based special fire extinguishing agent with fire-proof function prepared in Examples 1-5 and Comparative Examples 1-4 was uniformly mixed with water in a volume ratio of 3:97 to obtain samples. The surface tension, spreading coefficient, 25% liquid separation time, fire extinguishing time, and 25% anti-burning time were measured according to the test methods specified in GB 15308-2006 "Foam Fire Extinguishing Agents". When measuring the fire extinguishing time, the system pressure was 0.5 MPa, the liquid flow rate was 0.8 L / min, and the gas-liquid ratio was 16. Each group was repeated 3 times, and the average value was recorded. The specific test results are shown in the following table:

[0097]

[0098]

[0099] Data Analysis:

[0100] A comparative analysis of the data in the table above shows that the test and analysis data of Examples 1-5 are all superior to those of the comparative examples. Furthermore, the surface tension of the fire-resistant water-based special fire extinguishing agent for petrochemicals prepared by the present invention is optimally 17.19 mN / m. This allows the solution precipitated after the foam collapses to easily form a water film on the surface of most liquid fuels. A larger spreading coefficient facilitates the spreading of the foam produced by the fire-resistant water-based special fire extinguishing agent for petrochemicals on the surface of the fuel. The dual coverage of the water film and foam achieves excellent fire extinguishing, anti-reignition, and fire-resistant properties. Comparative Example 1 lacks the alkyl glycoside compared to Example 1, resulting in increased surface tension and a lower spreading coefficient, reducing the foam's ability to spread on the fuel surface. Its absence reduces foam coverage efficiency and prolongs fire extinguishing time. In comparative example 1, the epoxy group in epoxy-modified nano-silica undergoes a ring-opening reaction with the hydroxyl group in intermediate I, and the two are connected to obtain intermediate II, which increases compatibility and avoids the agglomeration of nano-silica. Nano-silica has a foam stabilizing effect, and the better its dispersibility, the more conducive it is to foam stabilization, effectively enhancing the foam structure, and extending the anti-burning time. Once it is missing, its fire extinguishing performance naturally decreases. Compared with comparative example 2, comparative example 3 lacks nano-silica, and the stability of the natural foam is reduced, and the fire extinguishing performance is reduced therewith. Compared with comparative example 3, comparative example 4 lacks ammonium dihydrogen phosphate, which decomposes under heat to generate polyphosphoric acid, promotes the formation of a carbonized layer, blocks the oxygen supply, and its absence reduces the flame retardant effect of the fire extinguishing agent, resulting in a reduction in fire extinguishing efficiency and a significant reduction in anti-burning time. All the test data of the embodiments of the present invention are better than the test data of the comparative examples, indicating that the petrochemical water-based special fire extinguishing agent with fire prevention function prepared by the present invention has good flame retardant, fire prevention and fire extinguishing properties. At the same time, the petrochemical water-based special fire extinguishing agent with fire prevention function prepared by the present invention is halogen-free and exhibits certain environmental protection properties.

[0101] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0102] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0103] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a petrochemical water-based special fire extinguishing agent with fire prevention function, characterized in that: The following steps are involved: Step (1) mixing aminosilane, 1,2-epoxychlorobutane and anhydrous ethanol, heating, reacting, filtering, washing and drying after the reaction is completed to obtain intermediate I; Step (2) under a nitrogen atmosphere, epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide are mixed, heated, reacted, and after the reaction is completed, rotary evaporation is performed to obtain intermediate II; Step (3) in an Ar gas environment, polytetrahydrofuran ether glycol, intermediate II, potassium carbonate and anhydrous ethanol are mixed, heated, reacted, and after the reaction is completed, vacuum distilled and dried to obtain a surfactant; Step (4) The surfactant, flame retardant, stabilizer, foaming agent, urea, cosolvent and deionized water are mixed to obtain a petrochemical water-based special fire extinguishing agent with fire prevention function.

2. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: The preparation method of epoxy-modified nano-silica comprises the following steps: Anhydrous ethanol, nano-silica and γ-(2,3-epoxypropoxy)propyltrimethoxysilane are mixed evenly and reacted. After the reaction is completed, the mixture is filtered, washed and dried to obtain epoxy-modified nano-silica. Wherein, the mass ratio of anhydrous ethanol, nano-silica and γ-(2,3-epoxypropoxy)propyltrimethoxysilane is (1200-2400):(20-30):(8-10); The reaction temperature is 60-80°C and the reaction time is 3-5h.

3. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (1), the mass ratio of aminosilane, 1,2-epoxychlorobutane and anhydrous ethanol is (8-10):(20-40):(50-90).

4. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (2), the mass ratio of epoxy-modified nano-silica, intermediate I and N,N-dimethylformamide is (40-60):(120-200):(600-1000).

5. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (3), the mass ratio of polytetramethylene ether glycol, intermediate II, potassium carbonate and anhydrous ethanol is (300-500):(90-150):(4-8):(1200-2000).

6. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: The mass ratio of surfactant, flame retardant, stabilizer, foaming agent, urea, co-solvent and deionized water is (2.1-4.4):(2.4-4.8):(1.2-1.6):(2.2-5.2):(2.8-3.6):(0.3-0.5):(60-96).

7. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (1), the reaction temperature is 60-70° C. and the reaction time is 6-9 h.

8. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (2), the reaction temperature is 70-90° C. and the reaction time is 30-36 h.

9. The method for preparing a petrochemical water-based special fire extinguishing agent with fire-proof function according to claim 1, characterized in that: In step (3), the reaction temperature is 50-60°C and the reaction time is 36-48h.

10. A petrochemical water-based special fire extinguishing agent with fire prevention function, characterized in that: The invention discloses a petrochemical water-based special fire extinguishing agent with fireproof function prepared by the preparation method of any one of claims 1 to 9.

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