A regenerative super-concentrated environmentally friendly practical foam fire extinguishing agent and its preparation method

Abstract

The invention discloses a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent and a preparation method thereof, and relates to the technical field of fire-fighting materials. The present application discloses a preparation method of a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent, comprising the following steps: adding a functional auxiliary agent and a plant saponin into a reactor, stirring and synthesizing once; continuously adding a hydrocarbon surfactant, an organosilicon surfactant, and water into the reactor in sequence, stirring and synthesizing for a second time, and standing at room temperature to obtain a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent; wherein the functional auxiliary agent is obtained by cross-linking xanthan gum with organically modified nano-silicon dioxide. The regenerated foam fire extinguishing agent concentrate prepared by the present invention is environmentally friendly, non-toxic and harmless, and can be directly sprayed on the outer clothes and face of firefighters, cooling down and insulating the firefighters from heat radiation in the fire scene, so as to further protect the life safety of firefighters.

Description

Technical Field

[0001] The invention relates to the technical field of fire-fighting materials, and in particular to a regenerative super-concentrated environmentally friendly practical foam fire extinguishing agent and a preparation method thereof. Background Art

[0002] Among the various disasters faced by mankind, fire is one of the sudden disasters with a high frequency, a wide range of involvement and a large impact. With the rapid development of my country's chemical energy industry, large-scale fire accidents caused by large-scale leakage of flammable liquids occur from time to time. Among them, oil fires, as one of the typical disasters of Class B fires, often bring great difficulties to firefighting due to their high calorific value, fast combustion and easy re-ignition. At present, the firefighting work for oil fires mainly includes dry powder fire extinguishing, foam fire extinguishing and fine water mist fire extinguishing. Among them, dry powder has a strong lipophilic property and has a poor cooling effect on the oil surface, while fine water mist is difficult to completely cover large fire scenes due to its high cost and limited fire extinguishing distance. Practice has proved that foam fire extinguishing agents have excellent isolation and cooling effects on liquid fuel vapors, and can quickly extinguish oil fires. The foam layer formed during the release of foam fire extinguishing agents can effectively block the heat radiation of the fire scene, and the foam spraying range is large, which can play a good cooling effect on large fires. Aqueous film-forming foam fire extinguishing agent is widely used in the fighting of some large-scale oil fires because it can spread quickly on the oil surface to form a liquid film to inhibit the volatilization of oil.

[0003] Aqueous film-forming foam fire extinguishing agent refers to a type of foam fire extinguishing agent that can quickly spread on the surface of liquid fuel and form a dense foam layer and water film layer during the fire extinguishing process. Its core components are hydrocarbon surfactants and fluorocarbon surfactants. Traditional fluorocarbon surfactants are produced by electrolysis or by tetrafluoroethylene polymerization, including branched or linear perfluorooctyl carboxylates C7F 15 COO - Or perfluorooctane sulfonate C8F 17 SO3 - Surfactants of this type are extremely stable in the environment and have high bioaccumulation properties. A certain amount of them can cause great harm to the nervous and immune systems of organisms. Summary of the invention

[0004] The purpose of the present invention is to provide a regenerative super-concentrated environmentally friendly practical foam fire extinguishing agent and a preparation method thereof, so as to solve the following technical problems:

[0005] Existing aqueous film-forming foam fire extinguishing agents use a complex of hydrocarbon surfactants and fluorocarbon surfactants as surfactants. However, traditional fluorocarbon surfactants are extremely stable in the environment and have high bioaccumulation properties. A certain amount can cause great harm to the nervous and immune systems of organisms.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent comprises the following steps:

[0008] Add functional additives and plant saponins into the reaction kettle and stir once for synthesis;

[0009] Continue to add hydrocarbon surfactant, silicone surfactant and water into the reaction kettle in sequence, stir and synthesize for the second time, and let it stand at room temperature to obtain a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent;

[0010] The preparation method of the functional additive comprises the following steps:

[0011] S1: In a nitrogen atmosphere, carboxylated nano-silica, N,N-dimethyl-1,3-propylenediamine and toluene are added to a reaction kettle, the temperature is controlled at 100-110°C, the reaction is kept warm for 6-9 hours, and the reaction is performed under reduced pressure distillation and suction filtration to obtain modified silica;

[0012] S2: Add epichlorohydrin, sodium bisulfite, ethylenediaminetetraacetic acid and deionized water into a reaction kettle and disperse them evenly, control the temperature to 70-80°C, keep the temperature to react for 2-4 hours, filter, wash and dry to obtain component 1;

[0013] S3: Add modified silica, isopropanol, deionized water and component 1 into a reaction kettle and disperse them evenly, control the temperature at 70-80°C, keep the temperature for reaction for 6-9h, filter, wash and dry to obtain component 2;

[0014] S4: Add xanthan gum, ethanol and deionized water into a reaction kettle and disperse them evenly, add sodium hydroxide, stir at room temperature for 0.5-1h, add component 2, control the temperature at 70-80°C, keep the temperature for 6-12h, filter, wash and dry to obtain a functional additive;

[0015] Functional additives account for 3-6% of the total mass of the foam fire extinguishing agent.

[0016] As a further solution of the present invention: the addition ratio of carboxylated nano-silica, N,N-dimethyl-1,3-propylenediamine, and toluene in S1 is 10 g: 1-2 g: 100-200 mL.

[0017] As a further solution of the present invention: the addition ratio of epichlorohydrin, sodium bisulfite, ethylenediaminetetraacetic acid and deionized water in S2 is 10g: 10-15g: 0.1-0.15g: 50-100mL.

[0018] As a further solution of the present invention: the addition ratio of modified silica, isopropanol, deionized water and component one in S3 is 10g:15-30mL:30-60mL:10-20g.

[0019] As a further solution of the present invention: the addition ratio of xanthan gum, ethanol, deionized water, sodium hydroxide and component two in S4 is 10g: 100-150mL: 25-40mL: 0.4-0.6g: 1-3g.

[0020] As a further scheme of the present invention: the preparation method of carboxylated nano-silica comprises the following steps: adding γ-aminopropyltriethoxysilane, succinic anhydride and N,N-dimethylformamide into a reaction kettle and dispersing them evenly, adding nano-silica and deionized water for blending, controlling the temperature at 40-50°C, keeping the temperature for 3-6 hours, washing and drying to obtain carboxylated nano-silica.

[0021] As a further solution of the present invention: the added amounts of γ-aminopropyltriethoxysilane, succinic anhydride, N,N-dimethylformamide, nano-silicon dioxide and deionized water are 2-5g: 1-1.5g: 100-200mL: 10g: 5-10mL.

[0022] As a further solution of the present invention: the organosilicon surfactant is at least one of PEG12-polydimethylsiloxane, polyether-modified polydimethylsiloxane, polyether-modified polyorganosiloxane and polyether-modified polyorganosiloxane; the organosilicon surfactant accounts for 0.1-1% of the total mass of the foam fire extinguishing agent.

[0023] As a further solution of the present invention: the hydrocarbon surfactant is any one of anionic hydrocarbon surfactant, nonionic hydrocarbon surfactant and amphoteric hydrocarbon surfactant; the hydrocarbon surfactant accounts for 0.5-3% of the total mass of the foam fire extinguishing agent.

[0024] As a further embodiment of the present invention: the anionic hydrocarbon surfactant is any one of sodium dodecyl sulfate and sodium α-olefin sulfonate.

[0025] As a further solution of the present invention: the amphoteric hydrocarbon surfactant is cocamidopropyl betaine.

[0026] As a further embodiment of the present invention: the nonionic hydrocarbon surfactant is an alkyl glycoside.

[0027] As a further solution of the present invention: the plant saponin accounts for 1-5% of the total mass of the foam fire extinguishing agent; the plant saponin is soapberry saponin.

[0028] As a further solution of the present invention: the preparation method of soapberry saponin comprises the following steps: using soapberry powder as raw material and ethanol as medium, and obtaining it by ultrasonic-assisted extraction.

[0029] As a further scheme of the present invention: the specific steps of the first stirring synthesis are: setting the stirring speed to 60-65rpm, the temperature to 35-45°C, and the stirring synthesis for 10-60min; the specific steps of the second stirring synthesis are: setting the stirring speed to 45-50rpm, the temperature to 35-45°C, and the stirring synthesis for 30-90min.

[0030] A regenerative super-concentrated environmentally friendly practical foam fire extinguishing agent is prepared by any one of the above preparation methods.

[0031] Beneficial effects of the present invention:

[0032] The present application first uses γ-aminopropyltriethoxysilane and succinic anhydride to carry out organic treatment on nano-silicon dioxide to obtain nano-silicon dioxide with carboxyl groups grafted on the surface, namely carboxylated nano-silicon dioxide; then the carboxyl groups on the surface of carboxylated nano-silicon dioxide react with N,N-dimethyl-1,3-propylenediamine to obtain silicon dioxide grafted with tertiary amine groups, namely modified silicon dioxide; the present application uses epichlorohydrin and sodium bisulfite as raw materials and ethylenediaminetetraacetic acid as a catalyst to react to obtain component one; the present application uses the tertiary amine groups on the surface of modified silicon dioxide to react with the halogen groups of component one to obtain nano-silicon dioxide with cationic groups and sulfonic acid groups grafted on the surface, namely component two; finally, the present application uses the cationic groups of component two to graft and modify xanthan gum to obtain a functional additive. The functional additive prepared by the present application is added to the foam fire extinguishing agent to effectively improve the stability of the foam. Moreover, since sulfonic acid groups, cationic groups and nano-silica are grafted on the xanthan gum molecular chain, the temperature resistance of the foam is effectively improved, the stability of the fire extinguishing agent foam under high temperature conditions is increased, and the effect of extinguishing oil fires is effectively improved.

[0033] This application blends functional additives with plant saponins, which is conducive to the association of plant essence molecular chains with functional additive molecular chains into single dispersed small molecules, thereby fully improving and enriching the foam accumulation capsule group, increasing the toughness of the foam capsule group and the high temperature, high salt resistance and fluidity of the film-forming, and fully improving the higher liquid resistance. After the finished product is prepared, it is left to stand for 2 hours to increase the stability of the product. This application uses hydrocarbon surfactants and silicone surfactants in combination, which are non-toxic and harmless to organisms; they are completely degraded by organisms and microorganisms in 8 hours, and do not decompose and produce harmful gases at normal temperature and pressure, meeting international emission standards. DETAILED DESCRIPTION

[0034] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The preparation method of the functional additive of embodiment 1 comprises the following steps:

[0036] S1: 2g of γ-aminopropyltriethoxysilane, 1g of succinic anhydride, and 100mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 10g of nano-silica and 5mL of deionized water were added and mixed, the temperature was controlled at 40°C, the mixture was kept warm for 3h, washed, and dried to obtain carboxylated nano-silica;

[0037] S2: In a nitrogen atmosphere, 10 g of carboxylated nano-silica, 1 g of N,N-dimethyl-1,3-propylenediamine, and 100 mL of toluene were added to a reactor, the temperature was controlled at 100°C, the reaction was kept warm for 6 h, and the reaction was performed under reduced pressure distillation and suction filtration to obtain modified silica;

[0038] S3: Add 10g of epichlorohydrin, 10g of sodium bisulfite, 0.1g of ethylenediaminetetraacetic acid, and 50mL of deionized water into a reaction kettle and disperse them evenly. Control the temperature to 70°C, keep the temperature for 2h, filter, wash, and dry to obtain component 1.

[0039] S4: 10 g of modified silica, 15 mL of isopropanol, 30 mL of deionized water, and 10 g of component 1 were added to a reaction kettle and dispersed evenly. The temperature was controlled at 70°C, and the reaction was kept warm for 6 h. Filtering, washing, and drying were performed to obtain component 2.

[0040] S5: Add 10g xanthan gum, 100mL ethanol and 25mL deionized water into a reactor and disperse them evenly, add 0.4g sodium hydroxide, stir at room temperature for 0.5h, add 1g component 2, control the temperature at 70℃, keep the reaction warm for 6h, filter, wash and dry to obtain a functional additive.

[0041] The preparation method of the functional additive of embodiment 2 comprises the following steps:

[0042] S1: 4 g of γ-aminopropyltriethoxysilane, 1.2 g of succinic anhydride, and 150 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 10 g of nano-silica and 7 mL of deionized water were added and mixed, the temperature was controlled at 45°C, the mixture was kept warm for 4 hours, and then washed and dried to obtain carboxylated nano-silica;

[0043] S2: In a nitrogen atmosphere, 10 g of carboxylated nano-silica, 1.5 g of N,N-dimethyl-1,3-propylenediamine, and 150 mL of toluene were added to a reactor, the temperature was controlled at 105°C, the reaction was kept warm for 7.5 h, and the modified silica was obtained by vacuum distillation and filtration.

[0044] S3: 10 g of epichlorohydrin, 12 g of sodium bisulfite, 0.12 g of ethylenediaminetetraacetic acid, and 70 mL of deionized water were added to a reaction kettle and dispersed evenly. The temperature was controlled at 75°C, and the reaction was kept warm for 3 h. The mixture was filtered, washed, and dried to obtain component 1.

[0045] S4: 10 g of modified silica, 20 mL of isopropanol, 40 mL of deionized water, and 20 g of component 1 were added to a reaction kettle and dispersed evenly. The temperature was controlled at 75°C, and the reaction was kept warm for 7 hours. Filtering, washing, and drying were performed to obtain component 2.

[0046] S5: Add 10g xanthan gum, 120mL ethanol and 30mL deionized water into a reactor and disperse them evenly. Add 0.5g sodium hydroxide and stir at room temperature for 0.5h. Add 2g component 2 and control the temperature at 75℃. Keep the reaction warm for 9h. Filter, wash and dry to obtain a functional additive.

[0047] The preparation method of the functional additive of Example 3 comprises the following steps:

[0048] S1: 3.5 g of γ-aminopropyltriethoxysilane, 1.2 g of succinic anhydride, and 150 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 10 g of nano-silicon dioxide and 10 mL of deionized water were added and mixed, the temperature was controlled at 0°C, the mixture was kept warm for 6 h, washed, and dried to obtain carboxylated nano-silicon dioxide;

[0049] S2: In a nitrogen atmosphere, 10 g of carboxylated nano-silica, 2 g of N,N-dimethyl-1,3-propylenediamine, and 200 mL of toluene were added to a reactor, the temperature was controlled at 110°C, the reaction was kept warm for 9 hours, and the reaction was performed under reduced pressure distillation and suction filtration to obtain modified silica;

[0050] S3: Add 10g of epichlorohydrin, 15g of sodium bisulfite, 0.15g of ethylenediaminetetraacetic acid, and 100mL of deionized water into a reaction kettle and disperse them evenly. Control the temperature to 80°C, keep the temperature for 4h, filter, wash, and dry to obtain component 1.

[0051] S4: 10 g of modified silica, 30 mL of isopropanol, 60 mL of deionized water, and 20 g of component 1 were added to a reaction kettle and dispersed evenly. The temperature was controlled at 80°C, and the reaction was kept warm for 9 hours. Filtering, washing, and drying were performed to obtain component 2.

[0052] S5: Add 10g xanthan gum, 150mL ethanol and 40mL deionized water into a reactor and disperse them evenly. Add 0.6g sodium hydroxide and stir at room temperature for 1h. Add 3g component 2 and control the temperature at 80℃. Keep the reaction warm for 12h. Filter, wash and dry to obtain a functional additive.

[0053] Embodiment 4 A method for preparing a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent comprises the following steps:

[0054] A1: Using soapberry powder as raw material and ethanol as medium, ultrasonic-assisted extraction was adopted with ultrasonic power of 100W, temperature of 40℃, solid-liquid ratio of 1:25, and ultrasonic extraction for 40min to obtain soapberry saponins;

[0055] A2: 6 g of the functional additive prepared in Example 1 and 1 g of plant saponin were added to the reaction kettle, the stirring speed was set to 65 rpm, the temperature was set to 35° C., and the stirring was performed for 3 min;

[0056] A3: Continue to add 3g of cocamidopropyl betaine, 1g of polyether modified polysiloxane (Silok 8000) and 89g of water into the reactor in sequence, set the stirring speed to 45rpm, the temperature to 35°C, stir and synthesize for 60min, and let it stand at room temperature to obtain a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent.

[0057] Embodiment 5 A method for preparing a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent comprises the following steps:

[0058] A1: Using soapberry powder as raw material and ethanol as medium, ultrasonic-assisted extraction was adopted with ultrasonic power of 100W, temperature of 40℃, solid-liquid ratio of 1:25, and ultrasonic extraction for 40min to obtain soapberry saponins;

[0059] A2: 6 g of the functional additive prepared in Example 1 and 1 g of plant saponin were added to the reaction kettle, the stirring speed was set to 65 rpm, the temperature was set to 35° C., and the stirring was performed for 3 min;

[0060] A3: Continue to add 3g of cocamidopropyl betaine, 1g of polyether modified polysiloxane (Silok 8000) and 89g of water into the reactor in sequence, set the stirring speed to 45rpm, the temperature to 35°C, stir and synthesize for 60min, and let it stand at room temperature to obtain a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent.

[0061] Example 6 A method for preparing a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent comprises the following steps:

[0062] A1: Using soapberry powder as raw material and ethanol as medium, ultrasonic-assisted extraction was adopted with ultrasonic power of 100W, temperature of 40℃, solid-liquid ratio of 1:25, and ultrasonic extraction for 40min to obtain soapberry saponins;

[0063] A2: 6 g of the functional additive prepared in Example 1 and 1 g of plant saponin were added to the reaction kettle, the stirring speed was set to 65 rpm, the temperature was set to 35° C., and the stirring was performed for 3 min;

[0064] A3: Continue to add 3g of cocamidopropyl betaine, 1g of polyether modified polysiloxane (Silok 8000) and 89g of water into the reactor in sequence, set the stirring speed to 45rpm, the temperature to 35°C, stir and synthesize for 60min, and let it stand at room temperature to obtain a regenerated ultra-concentrated environmentally friendly practical foam fire extinguishing agent.

[0065] The preparation method of the functional additive of Comparative Example 1 comprises the following steps:

[0066] S1: 4 g of γ-aminopropyltriethoxysilane, 1.2 g of succinic anhydride, and 150 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 10 g of nano-silica and 7 mL of deionized water were added and mixed, the temperature was controlled at 45°C, the mixture was kept warm for 4 hours, and then washed and dried to obtain carboxylated nano-silica;

[0067] S2: In a nitrogen atmosphere, 10 g of carboxylated nano-silica, 1.5 g of N,N-dimethyl-1,3-propylenediamine, and 150 mL of toluene were added to a reactor, the temperature was controlled at 105°C, the reaction was kept warm for 7.5 h, and the modified silica was obtained by vacuum distillation and filtration.

[0068] S3: 10 g of modified silica, 20 mL of isopropanol, 40 mL of deionized water, and 20 g of epichlorohydrin were added to a reaction kettle and dispersed evenly. The temperature was controlled at 75°C, and the reaction was kept warm for 7 hours. The mixture was filtered, washed, and dried to obtain component 2.

[0069] S4: Add 10g xanthan gum, 120mL ethanol and 30mL deionized water into a reactor and disperse them evenly, add 0.5g sodium hydroxide, stir at room temperature for 0.5h, add 2g component 2, control the temperature at 75℃, keep the reaction warm for 9h, filter, wash and dry to obtain a functional additive.

[0070] The preparation method of the functional additive of Comparative Example 2 comprises the following steps:

[0071] S1: In a nitrogen atmosphere, 10 g oleic acid, 1.5 g N,N-dimethyl-1,3-propylenediamine, and 150 mL toluene were added to a reaction kettle, the temperature was controlled at 105°C, the reaction was kept warm for 7.5 h, and the reaction was performed under reduced pressure distillation and suction filtration to obtain a reformed component 1;

[0072] S2: Add 10g of epichlorohydrin, 12g of sodium bisulfite, 0.12g of ethylenediaminetetraacetic acid, and 70mL of deionized water into a reaction kettle and disperse them evenly. Control the temperature to 75°C, keep the reaction warm for 3h, filter, wash, and dry to obtain component 2.

[0073] S3: Add 10g of component 1, 20mL of isopropanol, 40mL of deionized water, and 20g of component 2 into a reaction kettle and disperse evenly. Control the temperature at 75°C, keep the reaction warm for 7h, filter, wash, and dry to obtain component 3.

[0074] S4: Add 10g xanthan gum, 120mL ethanol and 30mL deionized water into a reactor and disperse them evenly, add 0.5g sodium hydroxide, stir at room temperature for 0.5h, add 2g component three, control the temperature at 75℃, keep the reaction warm for 9h, filter, wash and dry to obtain a functional additive.

[0075] The preparation method of the functional additive of Comparative Example 3 comprises the following steps:

[0076] S1: 4 g of γ-aminopropyltriethoxysilane, 1.2 g of succinic anhydride, and 150 mL of N,N-dimethylformamide were added to a reaction kettle and dispersed evenly, 10 g of nano-silica and 7 mL of deionized water were added and mixed, the temperature was controlled at 45°C, the mixture was kept warm for 4 hours, and then washed and dried to obtain carboxylated nano-silica;

[0077] S2: Add 10g xanthan gum, 120mL ethanol and 30mL deionized water into a reactor and disperse them evenly, add 0.5g sodium hydroxide, stir at room temperature for 0.5h, add 2g carboxylated nano-silica, control the temperature at 75℃, keep the reaction warm for 9h, filter, wash and dry to obtain a functional additive.

[0078] Comparative Example 4 Compared with Example 5, Example 4 only replaces the functional auxiliary agent prepared in Example 2 added in Example 5 with an equal amount of the functional auxiliary agent prepared in Comparative Example 1, and the remaining components and preparation method are completely consistent with Example 5.

[0079] Comparative Example 5 Compared with Example 5, Comparative Example 5 only replaces an equal amount of the functional auxiliary agent prepared in Example 2 added in Example 5 with the functional auxiliary agent prepared in Comparative Example 2, and the remaining components and preparation method are completely consistent with Example 5.

[0080] Comparative Example 6 Compared with Example 5, Example 6 only replaces the functional auxiliary agent prepared in Example 2 added in Example 5 with an equal amount of the functional auxiliary agent prepared in Comparative Example 3, and the remaining components and preparation method are exactly the same as those in Example 5.

[0081] Performance Testing

[0082] (1) Foaming performance: The foaming performance was tested according to GB / T 7462-1994 "Determination of foaming power of surfactants - Improved Ross-Miles method" using a 2152 Ross foam tester. The test results are shown in Table 1.

[0083] (2) Foam stability: The foam stability was tested according to GB / T 7462-1994 "Determination of foaming power of surfactants - Improved Ross-Miles method", and the foam 25% separation time was measured using a 2152 Ross foam instrument. The test results are shown in Table 1.

[0084] (3) Fire extinguishing performance: Tested in accordance with Appendix A of GB / T 15308-2006 “Foam Fire Extinguishing Agents”, recording 100% anti-burning time and fire extinguishing time. The test results are shown in Table 1;

[0085] Table 1: Statistical table of performance test data of Examples 4-6 and Comparative Examples 4-6

[0086]

[0087] It can be seen from Table 1 that the functional additive prepared in the present application is added to the fire extinguishing agent, which effectively improves the foaming ratio and foam stabilization coefficient of the fire extinguishing agent, and effectively improves the fire extinguishing effect of the fire extinguishing agent.

[0088] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent, characterized in that: The steps include: Add functional additives and plant saponins into the reaction kettle and stir once for synthesis; Continue to add hydrocarbon surfactant, silicone surfactant and water into the reaction kettle in sequence, stir and synthesize for the second time, and let it stand at room temperature to obtain a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent; The preparation method of the functional additive comprises the following steps: S1: In a nitrogen atmosphere, carboxylated nano-silica, N,N-dimethyl-1,3-propylenediamine and toluene are added to a reaction kettle, the temperature is controlled at 100-110°C, the reaction is kept warm for 6-9 hours, and the reaction is performed under reduced pressure distillation and suction filtration to obtain modified silica; S2: Add epichlorohydrin, sodium bisulfite, ethylenediaminetetraacetic acid and deionized water into a reaction kettle and disperse them evenly, control the temperature to 70-80°C, keep the temperature to react for 2-4 hours, filter, wash and dry to obtain component 1; S3: Add modified silica, isopropanol, deionized water and component 1 into a reaction kettle and disperse them evenly, control the temperature at 70-80°C, keep the temperature for reaction for 6-9h, filter, wash and dry to obtain component 2; S4: Add xanthan gum, ethanol and deionized water into a reaction kettle and disperse them evenly, add sodium hydroxide, stir at room temperature for 0.5-1h, add component 2, control the temperature at 70-80°C, keep the temperature for 6-12h, filter, wash and dry to obtain a functional additive; The functional additive accounts for 3-6% of the total mass of the foam fire extinguishing agent.

2. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The addition ratio of carboxylated nano-silica, N,N-dimethyl-1,3-propylenediamine, and toluene in S1 is 10 g: 1-2 g: 100-200 mL.

3. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The addition ratio of epichlorohydrin, sodium bisulfite, ethylenediaminetetraacetic acid and deionized water in S2 is 10g:10-15g:0.1-0.15g:50-100mL.

4. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The addition ratio of modified silica, isopropanol, deionized water, and component one in S3 is 10 g: 15-30 mL: 30-60 mL: 10-20 g.

5. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The addition ratio of xanthan gum, ethanol, deionized water, sodium hydroxide and component 2 in S4 is 10g:100-150mL:25-40mL:0.4-0.6g:1-3g.

6. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The preparation method of carboxylated nano-silica comprises the following steps: adding γ-aminopropyltriethoxysilane, succinic anhydride and N,N-dimethylformamide into a reaction kettle and dispersing them uniformly, adding nano-silica and deionized water for blending, controlling the temperature at 40-50° C., keeping the temperature for 3-6 hours, washing and drying to obtain carboxylated nano-silica.

7. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The organosilicon surfactant is at least one of PEG12-polydimethylsiloxane, polyether-modified polydimethylsiloxane, polyether-modified polyorganosiloxane, and polyether-modified polyorganosiloxane; the organosilicon surfactant accounts for 0.1-1% of the total mass of the foam fire extinguishing agent; The hydrocarbon surfactant is any one of anionic hydrocarbon surfactant, nonionic hydrocarbon surfactant and amphoteric hydrocarbon surfactant; the hydrocarbon surfactant accounts for 0.5-3% of the total mass of the foam fire extinguishing agent.

8. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The plant saponin accounts for 1-5% of the total mass of the foam fire extinguishing agent; the plant saponin is soapberry saponin.

9. The method for preparing a regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent according to claim 1, characterized in that: The specific steps of the first stirring synthesis are: setting the stirring speed to 60-65rpm, the temperature to 35-45°C, and stirring the synthesis for 10-60min; the specific steps of the second stirring synthesis are: setting the stirring speed to 45-50rpm, the temperature to 35-45°C, and stirring the synthesis for 30-90min.

10. A regenerated super-concentrated environmentally friendly practical foam fire extinguishing agent, characterized in that: Prepared by the preparation method described in any one of claims 1 to 9.

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