Forest fire extinguishing agent and preparation method therefor

Abstract

The present application provides a forest fire extinguishing agent and a preparation method therefor. The preparation method comprises the following steps: uniformly stirring and mixing a first flame retardant and a coupling agent, and adding a hydrophobic polymer monomer or a hydrophobic polymer monomer and an initiator into the mixture to obtain a second material; adding a surfactant into the second material to obtain a third material; dissolving a hydrophilic polymer in water, and then adding same into the third material to obtain a fourth material; and adding a flame retardant auxiliary agent and water into the fourth material to obtain a forest fire extinguishing agent.

Description

Forest fire extinguishing agent and preparation method thereof

[0001] The present application claims priority to the invention application with the application date of April 7, 2024, the application number of 202410409761.6, and the patent name of "Forest fire extinguishing agent and preparation method thereof", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of fire extinguishing agents, and particularly relates to a forest fire extinguishing agent and a preparation method thereof. BACKGROUND

[0003] Forest fires occur every year, often causing serious ecological and environmental disasters and significant loss of life and property. There are many types of fire extinguishing agents, but commonly used dry powder fire extinguishing agents, foam fire extinguishing agents and gas fire extinguishing agents are not suitable for extinguishing forest and grassland fires. Due to the violent airflow activity in the fire area, the above fire extinguishing agents are difficult to land on the burning material.

[0004] Water is the cheapest fire extinguishing agent, but its efficiency is very low when used to extinguish forest fires, and its role is to lower the surface temperature of the combustible material. Forest fires are characterized by large area, high temperature and fierce fire, and it is difficult to extinguish forest fires with a small amount of water.

[0005] Currently, "Halon" type halogen-containing forest fire extinguishing agents are commonly used, but halogen-based fire extinguishing agents release toxic substances at high temperatures, causing serious environmental pollution.

[0006] CONTENT

[0007] The present application provides a forest fire extinguishing agent and a preparation method thereof to solve the problem of toxic substance release at high temperatures and serious environmental pollution caused by halogen-based fire extinguishing agents.

[0008] To achieve the above purpose, the present application discloses a preparation method of a forest fire extinguishing agent, comprising the following steps:

[0009] (1) uniformly stirring and mixing the first fire retardant and the coupling agent to obtain a first material;

[0010] (2) adding a hydrophobic polymer monomer or adding a hydrophobic polymer monomer and an initiator to the first material, stirring uniformly to obtain a second material;

[0011] (3) adding a surfactant to the second material under stirring, heating to obtain a third material;

[0012] (4) dissolving a hydrophilic polymer in water and adding it to the third material, homogenizing, heating and stirring, constant temperature reaction to obtain a fourth material;

[0013] (5) cooling the fourth material, adding a fire retardant aid and water, stirring uniformly to obtain a forest fire extinguishing agent.

[0014] The first flame retardant is at least one of guanidine salt flame retardant, ammonium salt flame retardant and phosphorus-based flame retardant.

[0015] In the preferred embodiment of the present application, the amount of guanidine salt flame retardant is 5-30 parts by weight, the amount of phosphorus-based flame retardant is 5-35 parts by weight, and the amount of ammonium salt flame retardant is 5-25 parts by weight.

[0016] The present application first modifies the surface of various flame retardants with a coupling agent, then coats the modified flame retardants with hydrophobic polymer monomers, and under the action of hydrophilic polymers, in-situ polymerization forms a coated body with a core-shell structure, and a high-efficiency environmentally friendly water-based forest fire extinguishing agent is prepared. The forest fire extinguishing agent can quickly disperse in water, and after dilution with 10-20 times water, the extinguishing effect can reach the "2A" high-efficiency standard, the use method is simple, no toxic substances are produced at high temperature, and there is no impact on the ecology of forest areas, which is efficient and environmentally friendly.

[0017] Guanidine salt flame retardant is non-toxic, efficient, environmentally friendly and safe, and is the main agent of forest fire extinguishing agent. It has a fast natural degradation rate, and at high temperature, guanidine is decomposed into nitrogen, water and urea substances, which can dilute oxygen and quickly reduce the oxygen content in the air, cover and block the burning objects, and extinguish the fire. Ammonium salt flame retardant is non-toxic, efficient, environmentally friendly and safe, and has obvious flame-retardant effect, which is a traditional main flame-retardant agent.

[0018] The present application compounding guanidine salt flame retardant and ammonium salt flame retardant makes the flame retardant fully play a synergistic effect.

[0019] Further, in step (1), the amount of guanidine salt flame retardant is 5-30 parts by weight, and the amount of ammonium salt flame retardant is 5-25 parts by weight. Preferably, the guanidine salt flame retardant is selected from one or more of polymeric guanidine, guanidine carbonate, guanidine nitrate, guanidine acetate, guanidine phosphate, guanidine borate, guanidine sulfate, guanidine oxalate and guanidine benzoate. More preferably, the guanidine salt flame retardant is selected from one or more of guanidine carbonate, guanidine phosphate and guanidine borate. The ammonium salt flame retardant is selected from one or more of ammonium sulfate, ammonium carbonate, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen carbonate and ammonium polyphosphate. More preferably, the ammonium salt flame retardant is selected from one or more of ammonium phosphate, ammonium dihydrogen phosphate and ammonium polyphosphate.

[0020] In the preferred embodiment of the present application, in step (2), the initiator is added to the oil carrier and the first material, and the oil carrier is selected from at least one of mineral oil, petroleum ether and paraffin.

[0021] In order to further improve the flame-retardant effect, a second flame retardant is further added in step (4), and the second flame retardant is a metal hydroxide flame retardant, and the amount is 2-15 parts by weight.

[0022] The metal hydroxide flame retardant decomposes into a large amount of water and metal oxide at high temperature. The water can rapidly reduce the surface temperature of the burning object, and the metal oxide can cover the surface of the burning object to block the oxidation reaction. The generated metal oxide can not only block the oxidation of the burning object at high temperature, but also can smoke and improve the transparency of the air in the fire area.

[0023] The phosphorus-based flame retardant decomposes into phosphoric acid, polyphosphoric acid, metaphosphoric acid and other strong dehydrating acids upon heating. These acids rapidly dehydrate and carbonize the surface of the plant, forming a dense phosphorus-containing carbonized layer that blocks the oxidation reaction and absorbs the oxidation heat energy of the burning object, thereby isolating air and heat sources.

[0024] Preferably, the metal hydroxide is selected from one or more of magnesium hydroxide, iron hydroxide, aluminum hydroxide, calcium hydroxide, and zinc hydroxide. More preferably, the metal hydroxide is selected from one or more of aluminum hydroxide, calcium hydroxide, and magnesium hydroxide.

[0025] Preferably, the phosphorus-based flame retardant is selected from one or more of coated red phosphorus, phosphate ester, methyl phosphate, ethyl phosphate, butyl phosphate, zinc phosphate, isooctyl phosphate, isopropylated triphenyl phosphate, phenyl phosphate, and dimethyl methylphosphonate. More preferably, the phosphorus-based flame retardant is selected from one or more of coated red phosphorus, isooctyl phosphate, and isopropylated triphenyl phosphate.

[0026] Further, the coupling agent is selected from one or more of n-butyll titanate, aluminate, silane coupling agent, phosphate ester coupling agent, and borate ester coupling agent, and the amount of the coupling agent is 0.1-5.0 parts by weight. The silane coupling agent can be selected from KH550, KH560, KH570, or KH792. More preferably, the coupling agent is selected from one or more of silane coupling agent and n-butyll titanate.

[0027] The solvent for dissolving the coupling agent is selected from one or more of ethanol, methanol, butanol, acetone, dimethylformamide, dichloromethane, and trichloromethane. Preferably, the solvent is selected from one or more of ethanol, acetone, and dichloromethane. The amount of the solvent is 1-10 parts by weight.

[0028] Further, the hydrophobic polymer monomer is selected from one or more of methyl acrylate, ethyl acrylate, butyl acrylate, glycidyl methacrylate, 1,4-butanediol dimethacrylate, methyl methacrylate, acetyl acetoxy ethyl methacrylate, isophorone diisocyanate, toluene diisocyanate, and the amount of the hydrophobic polymer monomer is 0.5-20 parts by weight; the initiator is selected from one or more of azobisisobutyronitrile, potassium persulfate, ammonium persulfate, and benzoyl peroxide, and preferably, is selected from one or more of azobisisobutyronitrile and potassium persulfate; the mass ratio of the initiator to the hydrophobic polymer monomer is 0.01%-5.00%; the surfactant is selected from one or more of propylene glycol monolaurate, sorbitan monostearate, polyoxyethylene sorbitan monooleate, sorbitan laurate, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, diethylene glycol fatty acid ester, sorbitan monopalmitate, polyoxypropylene stearate, polyoxyethylene sorbitan trioleate, and sorbitan monooleate polyoxyethylene ether, and the ratio of the surfactant to the hydrophobic polymer monomer is 0.2-50:100; and the hydrophilic polymer is selected from one or more of polyvinyl alcohol, polyethylene glycol, acrylamide, N-methylol acrylamide, N-hydroxyethyl acrylamide, acrylonitrile, and diethylenetriamine, and the amount of the hydrophilic polymer is 0.1-10 parts by weight.

[0029] In order to make the hydrophobic polymer monomer more uniformly coated on the surface of the flame retardant, in step (2), a hydrophobic ester can be used as a diluent or a solvent.

[0030] Further, in step (4), the homogenization time is 1-60 min, and preferably, is 10-30 min; in step (4), the constant temperature heating temperature is 45℃-90℃, and preferably, is 45℃-80℃, and the constant temperature reaction time is 0.5h-8.0h, and preferably, is 1-3h.

[0031] Further, the flame retardant aid is selected from one or more of silicon dioxide nano powder, ammonium polyphosphate, sodium silicate, silica sol, aluminum hydroxide, and ammonium dihydrogen phosphate, and the amount of the flame retardant aid is 1-10 parts by weight.

[0032] To achieve the above object, the second aspect of the present application discloses a forest fire extinguishing agent prepared by the preparation method of the first aspect.

[0033] To achieve the above object, the third aspect of the present application discloses a forest fire extinguishing agent, which comprises: a flame retardant component having a core-shell structure, and a carrier.

[0034] The core-shell structure flame retardant, the core material of the core-shell structure flame retardant comprises a first flame retardant, the shell material comprises a water-absorbing polymer, and the first flame retardant is at least one of a guanidine salt flame retardant, an ammonium salt flame retardant, and / or a phosphorus-based flame retardant; preferably, the shell material further comprises a second flame retardant, and the second flame retardant is a metal hydroxide flame retardant.

[0035] Further, the carrier is water.

[0036] Further, the carrier is a solution or mixture comprising water and a flame retardant aid.

[0037] Further, the flame retardant aid is selected from one or more of silica nano powder, ammonium polyphosphate, sodium silicate, silica sol, aluminum hydroxide, and ammonium dihydrogen phosphate.

[0038] The preparation method of the forest fire extinguishing agent provided in the application comprises the following steps: first, surface modification treatment is performed on the flame retardant by using a coupling agent; then, the modified flame retardant is coated with a hydrophobic polymer monomer; under the action of a hydrophilic polymer, in-situ polymerization is performed to form a coated body with a core-shell structure, the diameter of the coated body is from several micrometers to tens of micrometers, the coated body can be rapidly dispersed and suspended in water, the fire extinguishing effect can reach the 2A level of the “national standard GB17835-2008. Water-based fire extinguishing agent” after dilution with 10-20 times water, the use method is simple, no toxic substances are generated at high temperatures, and the forest ecological environment is not affected, and the forest fire extinguishing agent is high in efficiency and environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] FIG. 1 is a structural schematic view of a paper strip used in a flame retardant effect test. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] The present application provides a forest fire extinguishing agent and a preparation method thereof. In the present application, all raw materials are commercially available products known to those skilled in the art.

[0043] Example 1

[0044] (1) Take 150 g of guanidine borate powder and 150 g of ammonium polyphosphate, and pre-mix them in a sand mill for 1 h. Take 15 g of silane coupling agent kH570, dissolve it in 80 ml of dichloromethane, and drop it into the stirring flame retardant. The dropping is completed in 30 min. Start the sand mill heater and keep the temperature at 45°C. Continue stirring for 30 min. Remove the solvent by volatilization to obtain the first material after modification.

[0045] (2) Take 8 g of methyl methacrylate and 8 g of 1,4-butanediol dimethacrylate, mix them uniformly, and then add them to the first material. Further dissolve 0.2 g of azobisisobutyronitrile in 20 g of mineral oil, and then add it to the first material. Heat to 40°C and continue stirring for 20 min to obtain the second material.

[0046] (3) Take 8 g of sorbitan monooleate polyoxyethylene ether, and add it to the second material under stirring. Mix uniformly, heat to 50°C, and stir for 20 min to obtain the third material.

[0047] (4) Take 4 g of N-hydroxyethyl acrylamide, dissolve it in 400 ml (60°C) of deionized water, and then add it to the third material. Homogenize for 10 min, and then keep the temperature at 60°C for 4 h of reaction to obtain the fourth material.

[0048] (5) Cool the fourth material to 45°C, add 50 g of silica sol, and supplement with deionized water to 1000 g. Stir for 10 min to obtain the forest fire extinguishing agent.

[0049] Example 2

[0050] (1) Take 150 g of guanidine carbonate and 100 g of ammonium polyphosphate, and pre-mix them in a sand mill for 1 h. Take 25 g of silane coupling agent kH550, dissolve it in 100 ml of dichloromethane, and drop it into the stirring flame retardant. The dropping is completed in 30 min. Start the sand mill heater and keep the temperature at 45°C. Continue stirring for 30 min. Remove the solvent by volatilization to obtain the first material after modification.

[0051] (2) Take 80 g of glycidyl methacrylate, mix it uniformly with the first material, dissolve 1 g of dibenzoyl peroxide in 20 g of mineral oil, and then add it to the first material. Heat to 50°C and continue stirring for 20 min to obtain the second material.

[0052] (3) Weigh 10 g of sodium dodecyl sulfate, add to the second material under stirring, mix well, heat to 50°C, stir for 20 min, and obtain the third material.

[0053] (4) Weigh 50 g of acrylonitrile, 100 g of aluminum hydroxide, and 5 g of sodium carboxymethyl cellulose, dissolve in 400 ml (60°C) of deionized water, and add to the third material. After homogenization for 10 min, react at 60°C for 4 h, and obtain the fourth material.

[0054] (5) Cool the fourth material to room temperature, add 40 g of nano-silicon dioxide powder, and make up to 1000 g with deionized water. After stirring for 10 min, obtain the forest fire extinguishing agent.

[0055] Example 3:

[0056] (1) Weigh 150 g of guanidine carbonate and 100 g of ammonium polyphosphate, and pre-mix in a sand mill for 1 h. Weigh 25 g of silane coupling agent kH550, dissolve in 100 ml of dichloromethane, and drop into the stirring flame retardant. Drop for 30 min. Start the sand mill heater, constant temperature 45°C, continue stirring for 30 min, and remove the solvent by volatilization to obtain the modified first material.

[0057] (2) Weigh 80 g of glycidyl methacrylate and add to the first material to mix evenly. Dissolve 1 g of dibenzoyl peroxide in 20 g of mineral oil, and further add to the first material. Heat to 50°C, continue stirring for 20 min, and obtain the second material.

[0058] (3) Weigh 10 g of sodium dodecyl sulfate, add to the second material under stirring, mix well, heat to 50°C, stir for 20 min, and obtain the third material.

[0059] (4) Weigh 50 g of acrylonitrile, 100 g of magnesium hydroxide, and 5 g of sodium carboxymethyl cellulose, dissolve in 400 ml (60°C) of deionized water, and add to the third material. After homogenization for 10 min, react at 60°C for 4 h, and obtain the fourth material.

[0060] (5) Cool the fourth material to room temperature, add 40 g of nano-silicon dioxide powder, and make up to 1000 g with deionized water. After stirring for 10 min, obtain the forest fire extinguishing agent.

[0061] Example 4:

[0062] (1) Take 150 g of ammonium polyphosphate with polymerization degree n > 25, 50 g of guanidine phosphate, and place them in a sand mill for pre-mixing for 1 h. Take 15 g of silane coupling agent KH550, dissolve it in 80 ml of anhydrous ethanol, and drop it into the flame retardant powder under stirring. Drop for 30 min, start the sand mill heater, keep the temperature at 60°C, and continue stirring for 40 min. Remove the solvent by volatilization to obtain the modified first material.

[0063] (2) Take 8 g of methyl methacrylate and 4 g of ethyl acrylate, add them to the first material, and stir until uniform. Further mix 0.2 g of azobisisobutyronitrile with 30 g of petroleum ether, and add it to the first material. Heat to 40°C, stir until uniform, and obtain the second material.

[0064] (3) Take 8 g of sorbitan monooleate polyoxyethylene ether, mix, heat to 50°C, and add the second material under stirring. Continue stirring for 20 min to obtain the third material.

[0065] (4) Take 20 g of diethylenetriamine, 150 g of aluminum hydroxide, and 10 g of sodium carboxymethyl cellulose, dissolve them in 400 ml (60°C) of deionized water, and add them to the third material. Homogenize for 30 min, keep the temperature at 70°C for 3 h to obtain the fourth material.

[0066] (5) Cool the fourth material to 45°C, add 50 g of ammonium dihydrogen phosphate, and make up to 1000 g with deionized water. Stir for 10 min to obtain the forest fire extinguishing agent.

[0067] Example 5:

[0068] (1) Take 100 g of polyguanidine, 150 g of ammonium polyphosphate powder, and 100 g of isopropylated triphenyl phosphate, and place them in a stirring sand mill for pre-mixing for 1 h. Take 15 g of silane coupling agent KH550, dissolve it in 80 ml of anhydrous ethanol, and drop it into the flame retardant under stirring. Drop for 30 min, start the sand mill heater, keep the temperature at 60°C, and continue stirring for 40 min. Remove the solvent by volatilization to obtain the modified first material.

[0069] (2) Take 40 g of isophorone diisocyanate, add it to the first material, stir until uniform, add 10 ml of mineral oil, heat to 40°C, and further stir until uniform to obtain the second material.

[0070] (3) Take 3 g of sorbitan monopalmitate, mix, heat to 50°C, and stir for 10 min. Add the second material, stir until uniform, and obtain the third material.

[0071] (4) Take diethylene triamine 20 g, aluminum hydroxide 50 g, disperse in 400 ml (60 °C) deionized water, and add to the third material, homogenize for 20 min, then react at 65 °C for 2.5 h to obtain the fourth material.

[0072] (6) Cool the sixth material to 45 °C, add silica sol 50 g, and supplement with deionized water to 1000 g, stir for 10 min, then obtain the forest fire extinguishing agent.

[0073] Comparative Example 1: (remove polyphosphoric amine on the basis of Example 1, used to prove the synergism of phosphate ester and guanidine)

[0074] In Example 1 step (1), change to: take guanidine borate powder 300 g, take silane coupling agent kH570 15 g, dissolve in 80 ml dichloromethane, drop into the stirring fire retardant, 30 min drop complete. Start the sand mill heater, constant temperature 45 °C, continue to stir for 30 min, volatilize to remove the solvent, obtain the modified first material. The rest of the steps remain unchanged.

[0075] Comparative Example 2: (remove guanidine on the basis of Example 1, used to prove the synergism of phosphate ester and guanidine)

[0076] In Example 1 step (1), change to: take ammonium polyphosphate 300 g, take silane coupling agent kH570 15 g, dissolve in 80 ml dichloromethane, drop into the stirring fire retardant, 30 min drop complete. Start the sand mill heater, constant temperature 45 °C, continue to stir for 30 min, volatilize to remove the solvent, obtain the modified first material. The rest of the steps remain unchanged.

[0077] Comparative Example 3: (add aluminum hydroxide to the core of the capsule on the basis of Example 1, used to prove that adding aluminum hydroxide to the core of the capsule has no synergistic effect)

[0078] (1) Take guanidine borate powder 150 g, ammonium polyphosphate 150 g, 100 g aluminum hydroxide, pre-mix in a sand mill stirrer for 1 h. Take silane coupling agent kH570 15 g, dissolve in 80 ml dichloromethane, drop into the stirring fire retardant, 30 min drop complete. Start the sand mill heater, constant temperature 45 °C, continue to stir for 30 min, volatilize to remove the solvent, obtain the modified first material.

[0079] (2) Take methyl methacrylate 8 g, 1,4-butanediol dimethacrylate 8 g, stir evenly, then add to the first material, further dissolve azobisisobutyronitrile 0.2 g in 20 g mineral oil, further add to the first material, heat to 40 °C, continue to stir for 20 min, obtain the second material.

[0080] (3) Take sorbitan monooleate polyoxyethylene ether 8 g, add to the second material under stirring, mix evenly, heat to 50°C, stir for 20 min, to obtain the third material.

[0081] (4) Take N-hydroxyethyl acrylamide 4 g, dissolve in 400 ml (60°C) deionized water, and add to the third material, homogenize for 10 min, then react at 60°C for 4 h to obtain the fourth material.

[0082] (5) Cool the fourth material to 45°C, add 50 g of silica sol, and supplement with deionized water to 1000 g, stir for 10 min, to obtain the forest fire extinguishing agent.

[0083] Comparative Example 4: (on the basis of Example 1, adding aluminum hydroxide in the capsule shell, to prove that adding aluminum hydroxide in the capsule shell has a synergistic effect)

[0084] (1) Take guanidine borate powder 150 g, ammonium polyphosphate 150 g, and pre-mix in a sand mill for 1 h. Take silane coupling agent kH570 15 g, dissolve in 80 ml of dichloromethane, and drop into the flame retardant under stirring, drop for 30 min. Start the sand mill heater, constant temperature 45°C, continue to stir for 30 min, remove the solvent by volatilization, to obtain the modified first material.

[0085] (2) Take methyl methacrylate 8 g, 1,4-butanediol dimethacrylate 8 g, stir evenly, and add to the first material. Further dissolve azobisisobutyronitrile 0.2 g in 20 g of mineral oil, and further add to the first material. Heat to 40°C, continue to stir for 20 min, to obtain the second material.

[0086] (3) Take sorbitan monooleate polyoxyethylene ether 8 g, add to the second material under stirring, mix evenly, heat to 50°C, stir for 20 min, to obtain the third material.

[0087] (4) Take N-hydroxyethyl acrylamide 4 g, aluminum hydroxide 100 g, carboxymethyl cellulose 5 g, dissolve in 400 ml (60°C) deionized water, and add to the third material. Homogenize for 10 min, then react at 60°C for 4 h to obtain the fourth material.

[0088] (5) Cool the fourth material to 45°C, add 50 g of silica sol, and supplement with deionized water to 1000 g, stir for 10 min, to obtain the forest fire extinguishing agent.

[0089] Comparative Example 5: (on the basis of Example 2, on the basis of step (2), remove the component of mineral oil added, to prove that the dispersion effect of the flame retardant is not good, and precipitation occurs during the later storage process)

[0090] (1) Take guanidine carbonate 150 g, polyphosphoric acid ammonium 100 g, put in sand mill mixer pre-mixed 1 h. Another take silane coupling agent kH550 25 g, dissolved in 100 ml dichloromethane, drop into the stirring under the flame retardant, 30 min drop. Start sand mill heater, constant temperature 45℃, continue to stir 30 min, volatile removal of solvent, get modified first material.

[0091] (2) Take glycidyl methacrylate 80 g, 1 g of dibenzoyl oxide mixed evenly, add the first material further mixed evenly, heated to 50℃, continue to stir 20 min, get the second material.

[0092] (3) Take sodium dodecyl sulfate 10 g, under the condition of stirring into the second material, mixed evenly after heated to 50℃, stirring 20 min, get the third material.

[0093] (4) Take acrylonitrile 50 g, 100 g of aluminum hydroxide, 5 g of sodium carboxymethyl cellulose, dissolved in 400 ml (60℃) deionized water, and added to the third material, homogenization treatment 10 min, 60℃ constant temperature reaction 4 h, get the fourth material.

[0094] (5) The fourth material is cooled to room temperature, add 40 g of nano silicon dioxide powder, and supplement to 1000 g with deionized water, stir 10 min, get the forest fire extinguishing agent.

[0095] Test 1 guanidine salt flame retardant flame retardant effect test

[0096] Test preparation: cut the newsprint into the following size: long 180 mm x wide 33.33 mm rectangle, at the long side 150 mm, along the diagonal cut into 30 mm high isosceles trapezoid, figure as shown in figure 1.

[0097] Paper strip is ready to put into constant temperature drying oven 40℃ drying 4 h, ready for use.

[0098] Guanidine flame retardant is dissolved in deionized water to form a solution with a content of 5wt%. The test paper strip is immersed in the solution for 10 seconds, and then hung in the room to dry for 48 hours. Then it is put into the oven at 40℃ for 4 hours to get the test paper strip with blank trapezoidal area without drug.

[0099] Light the candle, align the trapezoidal area without drug with the candle flame, and ignite the test paper strip. Measure the unburned area accurately to calculate the flame retardant rate. The guanidine flame retardant rate is shown in table 1 as follows:

[0100] Table 1 guanidine flame retardant efficiency table

[0101] Test 2 forest fire extinguishing agent flame retardant effect test

[0102] After the forest fire extinguishing agent prepared in Examples 1-5 and Comparative Examples 1-5 was diluted with 20 times water, 10 test paper strips of the same test paper strip in Test 1 were immersed in the above diluted forest fire extinguishing agent for 10 seconds, respectively, and then taken out to be hung in the room, dried for 48 hours, and then put into an oven at 40°C for drying for 4 hours to obtain the test paper strips with the trapezoidal area as blank no-agent control area.

[0103] The trapezoidal no-agent area was aligned with the candle flame, and the test paper strip was ignited. The unburned area was accurately measured, and the fire retardant rate of the forest fire extinguishing agent prepared in Examples 1-5 and Comparative Examples 1-5 was calculated. The test results are shown in Table 2.

[0104] Table 2 Fire Retardant Different Proportions and Fire Retardant Effects

[0105] Further stability test was carried out. The forest fire extinguishing agents of Examples 1-5 and Comparative Examples 1-5 were stored in a warehouse at day and night temperature of 15-30°C for 2 months. After storage, whether the different forest fire extinguishing agents were stratified and precipitated was observed. Among them, the forest fire extinguishing agent of Comparative Example 5 appeared obvious large deposits at the bottom of the storage container, and the forest fire extinguishing agent of Example 5 appeared powder-like deposits. The stability of the remaining examples and comparative examples was good, and no obvious deposits appeared.

[0106] Test 3 Fire Extinguishing Effect Test

[0107] Preparation

[0108] A: Wooden sticks, specifications: square cross section, side length 40 mm, wooden stick length 500 mm. Number of wooden sticks: 72. Moisture content of wooden sticks <10%.

[0109] B: Wooden stick pile, wooden sticks were arranged on a metal support, total height 400 mm, 8 wooden sticks were arranged in each layer, and a total of 9 layers were arranged.

[0110] C: Ignition agent was 1500 ml of No. 120 solvent oil in a square metal pan, the side length of the metal pan was less than the side length of the wood pile. 30 mm deep water was added to the metal pan. The solvent oil was ignited, and after burning out, the metal pan was removed.

[0111] D: After the wood pile was ignited, free burning was carried out, and when the mass power was less than 53% of the original mass, the pre-burning was completed.

[0112] E: A fire extinguisher with a volume of 6.6 L was filled with the forest fire extinguishing agent diluted with 20 times water, and the spray valve was opened to spray the extinguishing agent at a distance of 1.8 meters from the wood pile. The wood pile was approached while spraying, and the extinguishing agent was sprayed from the top, bottom and side of the wood pile.

[0113] Five same wood piles are set respectively, and each of the forest fire extinguishing agents of the above-mentioned embodiments 1-5 is used to extinguish fire of one wood pile respectively, and the experimental results are as follows: after the forest fire extinguishing agent is sprayed, the fire of the five wood piles is extinguished, and no rekindling occurs within 10 minutes.

[0114] According to the national standard, the extinguishing effect reaches 2A.

[0115] Toxicity test

[0116] The forest fire extinguishing agents of the above-mentioned embodiments 1-5 are subjected to toxicity test, and the specific method is that after the forest fire extinguishing agent is diluted by 20 times of water, no zebra fish dies after normal feeding for 96 hours. Conclusion: the toxicity is zero.

[0117] The freezing point test result is that the freezing point reaches-19--20℃.

[0118] The corrosion rate test result is that the corrosion rate is less than 0.9mdd.

[0119] The use method of the forest fire extinguishing agent of the present application is as follows:

[0120] The forest fire extinguishing agent is diluted by 10-20 times of water and sprayed. First, a fireproof and flame-retardant isolation belt with a width of 50-100m is sprayed by an aerial water spraying plane 500m away from the downwind area of the fire area, and after the fireproof belt is established, the forest fire extinguishing agent is sprayed to the crown fire to extinguish the crown fire, and finally the ground fire is extinguished. In addition to the aerial water spraying plane, the ground fire extinguishing vehicles, fire extinguishing armored vehicles and small spraying devices carried by artificial can also be used for extinguishing fire.

[0121] The specific embodiments in the present application are only an explanation of the present application, and are not a limitation of the present application. After reading the present specification, those skilled in the art can make modifications to the present embodiments without creative contribution, but as long as the present application is within the scope of the claims, it is protected by the patent law.

Claims

1. A method for preparing a forest fire extinguishing agent, wherein: The following steps are involved: (1) stirring and mixing the first flame retardant and the coupling agent to obtain a first material; (2) adding a hydrophobic polymer monomer or a hydrophobic polymer monomer and an initiator to the first material, stirring uniformly to obtain a second material; (3) adding a surfactant to the second material under stirring and heating to obtain a third material; (4) dissolving the hydrophilic polymer in water and adding the mixture to the third material, homogenizing the mixture, heating and stirring the mixture, and reacting the mixture at a constant temperature to obtain the fourth material; (5) Cool the fourth material, add a flame retardant additive and water, and stir evenly to obtain a forest fire extinguishing agent.

2. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: In step (1), the first flame retardant is at least one of a guanidine salt flame retardant, an ammonium salt flame retardant and a phosphorus flame retardant.

3. The method for preparing a forest fire extinguishing agent according to claim 2, wherein: The amount of the guanidine salt flame retardant is 5-30 parts by weight, the amount of the phosphorus flame retardant is 5-35 parts by weight, and the amount of the ammonium salt flame retardant is 5-25 parts by weight.

4. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: In step (2), the initiator is added to an oily carrier and then added to the first material.

5. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: In step (4), a second flame retardant is further added, wherein the second flame retardant is a metal hydroxide flame retardant, and the amount used is 2-15 parts by weight.

6. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: The coupling agent is selected from one or more of butyl orthotitanate, aluminate, silane coupling agent, phosphate coupling agent, and borate coupling agent, and the amount of the coupling agent is 0.1-5.0 parts by weight.

7. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: The hydrophobic polymer monomer is selected from one or more of methyl acrylate, ethyl acrylate, polybutyl acrylate, glycidyl acrylate, 1,4-butanediol dimethacrylate, methyl methacrylate, ethyl acetoacetate methacrylate, isophorone diisocyanate, and toluene diisocyanate. The amount of the hydrophobic polymer monomer is 0.5-20 parts by weight, and the mass ratio of the initiator to the hydrophobic polymer monomer is 0.01%-5.00%. The surfactant is selected from propylene glycol monolaurate, sorbitan monostearate, polyoxyethylene sorbitan monooleate, sorbitan monooleate, and sorbitan monooleate. The invention relates to a surfactant comprising one or more of lauric acid ester, sodium lauryl sulfate, sodium dodecylbenzenesulfonate, diethylene glycol fatty acid ester, sorbitan monopalmitate, polyoxypropylene stearate, polyoxyethylene sorbitan trioleate, and sorbitan monooleate polyoxyethylene ether, wherein the ratio of the surfactant to the hydrophobic polymer monomer is 0.2-50:100; the hydrophilic polymer is selected from one or more of polyvinyl alcohol, polyethylene glycol, acrylamide, N-hydroxymethyl acrylamide, N-hydroxyethyl acrylamide, acrylonitrile, and diethylenetriamine, and the amount of the hydrophilic polymer is 0.1-10 parts by weight.

8. The method for preparing a forest fire extinguishing agent according to claim 1, wherein: In step (4), the homogenization treatment time is 1-60 min; in step (4), the heating temperature of the isothermal reaction is 45° C.-90° C., and the isothermal reaction time is 0.5 h-8.0 h.

9. A forest fire extinguishing agent, wherein: The forest fire extinguishing agent is prepared by the preparation method according to any one of claims 1 to 8.

10. A forest fire extinguishing agent, wherein: The forest fire extinguishing agent comprises: a flame retardant component having a core-shell structure, and a carrier; In the core-shell structured flame retardant, the core material includes a first flame retardant, the shell material includes a water-absorbing polymer, and the first flame retardant is at least one of a guanidine salt flame retardant, an ammonium salt flame retardant, and / or a phosphorus-based flame retardant; preferably, the shell material further includes a second flame retardant, and the second flame retardant is a metal hydroxide flame retardant.

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