CN112657113B - Anti-afterburning type flame-retardant fire extinguishing agent applied to electric power system fire and preparation method thereof - Google Patents
Anti-afterburning type flame-retardant fire extinguishing agent applied to electric power system fire and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-afterburning type flame-retardant fire extinguishing agent applied to a power system fire and a preparation method thereof. The invention takes phosphorus-containing high-molecular flame retardant and styrene with flame retardant effect as wall materials, takes ammonium dihydrogen phosphate and sodium chloride with inhibiting effect as core materials, and can prepare the reignition-resistant flame-retardant fire extinguishing agent with a core-shell structure, which is applied to the fire disaster of the power system, after emulsification and granulation. Through the way, the wall material applied to the anti-reburning type fire retardant and fire extinguishing agent for the fire of the power system, which is prepared by the invention, has the capacity of suppressing the open fire, the core material of the wall material has the capacity of suppressing the reburning of the fire, and the fire extinguishing agent can realize the suppression and inhibition of the fire through the modes of firstly suppressing the open fire and then releasing the inhibitor; meanwhile, the fire extinguishing agent has targeting property, does not damage normal batteries, and only acts on thermal runaway batteries; the fire extinguishing agent does not need manual control, can be automatically activated and released at the initial stage of fire occurrence, and is favorable for improving the safety performance of a power system, particularly a lithium battery energy storage power station.
Description
Technical Field
The invention relates to the technical field of fire fighting of electric power systems, in particular to a afterburning-resistant type flame-retardant fire extinguishing agent applied to electric power systems and a preparation method thereof.
Background
The fire disaster of the power system, especially the battery fire disaster of the lithium battery energy storage system is greatly different from the common fire disaster, and the fire disaster is caused by the heat generated in the battery after the thermal runaway happens as the energy aggregate, and the lithium battery fire disaster can not be completely extinguished by the conventional method of isolating oxygen through physical dilution or cutting off a combustion chain. The existing fire extinguishing agent such as heptafluoropropane only can extinguish open fire, cannot fundamentally inhibit the occurrence of fire, and usually can re-ignite later, so that the repeated re-ignition of a lithium battery is a great challenge for the existing fire extinguishing system.
At present, the research on lithium battery energy storage power station fire extinguishing devices at home and abroad is still in a starting stage, most energy storage systems still use the traditional electric fire extinguishing devices, the fire characteristics of the lithium battery of the energy storage system are not cleared fundamentally, a targeted fire protection technical scheme and an efficient fire extinguishing device are lacked, and the aim of effectively solving the fire fighting problem of the lithium battery of the energy storage system is difficult to achieve. Therefore, the research on the key materials of the lithium battery fire safety and the design and development of novel fire extinguishing agent materials according to the fire protection characteristic parameters have important significance for researching the fire extinguishing technology and the applicability, reliability and effectiveness of the fire extinguishing technology and equipment in a large energy storage system.
The patent with publication number CN110215642A provides a thermal response core-shell structure fire extinguishing agent suitable for a lithium ion battery and a preparation method thereof, the thermal response polymer is used as a shell, a flame retardant material is used as an inner core, the shell wraps the inner core to form a core-shell structure, when the temperature of the lithium battery reaches a set temperature, the conformation of the shell is changed from collapse to an extension state, the flame retardant material of the inner core is released, and therefore the flame retardant effect is achieved, and the battery explosion is prevented. However, the inner core of the patent only can play a role in flame retardance and cannot inhibit the re-ignition of fire, so that the method still has certain potential safety hazard.
In view of the above, there is still a need to provide a fire reignition-resistant fire retardant extinguishing agent applied to a power system for further suppressing the reignition of a fire after the fire retardation, and a preparation method thereof, so as to suppress and suppress the fire and improve the safety of a lithium battery energy storage power station.
Disclosure of Invention
The invention aims to solve the problems and provides an anti-reburning type flame retardant fire extinguishing agent applied to a power system fire and a preparation method thereof.
In order to achieve the aim, the invention provides a preparation method of an anti-afterburning type flame retardant fire extinguishing agent applied to a power system fire, which comprises the following steps:
s1, mixing the phosphorus-containing high polymer flame retardant with styrene according to a preset mass ratio, and dissolving the mixture in a chloroform solvent for later use, and marking as a solution A;
s2, mixing ammonium dihydrogen phosphate and sodium chloride, dissolving in water, filtering to remove impurities, and taking clear liquid for later use as solution B;
s3, uniformly mixing the solution B prepared in the step S2 and the solution A prepared in the step S1 according to a preset volume ratio to obtain a mixed solution, adding an emulsifier into the mixed solution, and fully stirring to form a water-in-oil emulsion solution which is marked as solution C;
s4, adding a predetermined amount of alumina and calcium carbonate into the solution C prepared in the step S3, filtering after the reaction is completed, taking the powder material obtained by filtering, and drying to obtain the anti-afterburning type flame-retardant fire extinguishing agent.
Further, in step S1, the preset mass ratio is 1 (0.5-1.5).
Further, in step S1, the phosphorus-containing polymeric flame retardant is any one of dimethyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate, and trimethyl phosphite.
Further, in step S2, the mass ratio of the ammonium dihydrogen phosphate to the sodium chloride is (4-8): 1.
Further, in step S3, the preset volume ratio is 1 (1-3).
Further, in step S3, the emulsifier is a mixture of cetyltrimethylammonium bromide and sodium lauryl sulfate.
Further, in step S4, the mass ratio of the solution C to the alumina is 10 (1-3), and the mass ratio of the solution C to the calcium carbonate is 10 (0.5-1).
Further, in step S4, the reaction includes the following processes: firstly heating to 70 ℃, reacting for 1-3 h, curing for 1h at 80 ℃, and then cooling to room temperature.
In order to achieve the purpose, the invention also provides an anti-afterburning type flame-retardant fire extinguishing agent applied to the fire of the power system, which is prepared according to any one of the technical schemes, comprises a core material and a wall material coated on the outer side of the core material and is of a core-shell structure; the core material comprises ammonium dihydrogen phosphate and sodium chloride, and the wall material comprises a phosphorus-containing high-molecular flame retardant and styrene.
Furthermore, the particle size of the anti-afterburning type flame-retardant fire extinguishing agent applied to the fire of the power system is 100-6000 nm.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the low-melting-point high-molecular polymer with a flame-retardant effect is used as a wall material, the high-efficiency environment-friendly cooling fire extinguishing agent with an inhibiting effect is used as a core material, a core-shell structure is formed and granulated, and the re-ignition resistant type flame-retardant fire extinguishing agent applied to the fire of a power system can be prepared; the wall material for the anti-afterburning type fire retardant and extinguishing agent for the fire disaster of the power system comprises a phosphorus-containing high polymer fire retardant and styrene, has the capacity of extinguishing the open fire, has the capacity of inhibiting the afterburning of the fire disaster due to the fact that the core material comprises ammonium dihydrogen phosphate and sodium chloride, and can realize the extinguishing and inhibiting of the fire disaster in a mode of firstly extinguishing the open fire and then releasing the inhibitor.
2. The anti-afterburning type flame-retardant fire extinguishing agent for the fire disaster of the power system, provided by the invention, has targeting property: when the fire extinguishing agent particles are applied to the periphery of the thermal runaway cell, the wall materials not only can play a role in extinguishing open fire, but also can be melted and automatically exploded after reaching the starting temperature, so that the internal core materials are released for gasification, temperature reduction and fire extinguishing, and fire re-burning is inhibited; and for normal batteries, the fire extinguishing agent has no harm and does not influence the normal use of the batteries.
3. The preparation method of the reignition-resistant flame-retardant fire extinguishing agent for the fire of the power system is simple, the product performance is stable, and the reignition-resistant flame-retardant fire extinguishing agent can be processed into products in various forms such as superfine powder, paint, patches, fire extinguishing agent additives and the like; meanwhile, the fire extinguishing agent particles are small, can be widely applied to positions which are narrow in space and difficult to reach by traditional fire extinguishing equipment, do not need manual control, can be automatically activated and released at the initial stage of fire occurrence, are favorable for improving the safety performance of an electric power system, particularly a lithium battery energy storage power station, and have important practical significance and good application prospect.
Drawings
FIG. 1 is an electron microscope photograph of the fire re-ignition resistant type fire retardant applied to the power system prepared in example 1 of the present invention;
FIG. 2 is a particle size distribution diagram of the anti-afterburning type fire retardant extinguishing agent for use in power system fire prepared in example 1 of the present invention;
FIG. 3 is a TEM image of the anti-afterburning type fire retardant applied to the power system in example 1 of the present invention;
FIG. 4 is a fire extinguishing test chart of the reignition-resistant type fire retardant agent for use in power system fire made in example 1 of the present invention;
FIG. 5 is a diagram showing a gap test of the anti-afterburning type fire retardant of the embodiments 1 to 3 of the present invention applied to a power system;
FIG. 6 is an electron microscope image of the fire reignition resistant type fire retardant extinguishing agent applied to the power system, prepared in examples 1-2 of the present invention, before and after the fire extinguishing release.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention provides a preparation method of an anti-afterburning type flame-retardant fire extinguishing agent applied to a power system fire, which comprises the following steps:
s1, mixing the phosphorus-containing high polymer flame retardant with styrene according to a preset mass ratio, and dissolving the mixture in a chloroform solvent for later use, and marking as a solution A;
s2, mixing ammonium dihydrogen phosphate and sodium chloride, dissolving in water, filtering to remove impurities, and taking clear liquid for later use as solution B;
s3, uniformly mixing the solution B prepared in the step S2 and the solution A prepared in the step S1 according to a preset volume ratio to obtain a mixed solution, adding an emulsifier into the mixed solution, and fully stirring to form a water-in-oil emulsion solution which is marked as solution C;
s4, adding a predetermined amount of alumina and calcium carbonate into the solution C prepared in the step S3, filtering after the reaction is completed, taking the powder material obtained by filtering, and drying to obtain the anti-afterburning type flame-retardant fire extinguishing agent.
In step S1, the preset mass ratio is 1 (0.5-1.5); the phosphorus-containing high polymer flame retardant is any one of dimethyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate and trimethyl phosphite.
In step S2, the mass ratio of the ammonium dihydrogen phosphate to the sodium chloride is (4-8): 1.
In step S3, the preset volume ratio is 1 (1-3); the emulsifier is a mixture of cetyl trimethyl ammonium bromide and sodium dodecyl sulfate.
In step S4, the mass ratio of the solution C to the alumina is 10 (1-3), and the mass ratio of the solution C to the calcium carbonate is 10 (0.5-1); the reaction comprises the following processes: firstly heating to 70 ℃, reacting for 1-3 h, curing for 1h at 80 ℃, and then cooling to room temperature.
The invention also provides an anti-afterburning type fire-retardant extinguishing agent applied to the fire of the power system, which is prepared according to any one of the technical schemes, and comprises a core material and a wall material coated on the outer side of the core material, and is of a core-shell structure; the core material comprises ammonium dihydrogen phosphate and sodium chloride, and the wall material comprises a phosphorus-containing high-molecular flame retardant and styrene; the particle size of the anti-afterburning type flame-retardant fire extinguishing agent applied to the fire of the power system is 100-6000 nm.
The following description will explain the preparation method of the anti-afterburning type fire retardant applied to the power system fire by combining the embodiment and the accompanying drawings.
Example 1
The embodiment provides a preparation method of an anti-afterburning type flame retardant fire extinguishing agent applied to a power system fire disaster, which comprises the following steps:
s1, preparing wall materials: weighing 10g of dimethyl phosphate, mixing the dimethyl phosphate with 10g of styrene, dissolving the mixture in 500mL of chloroform solvent, stirring for 30min, and marking the mixture as solution A after complete dissolution for later use;
s2, core material preparation: weighing 30g of ammonium dihydrogen phosphate and 6g of sodium chloride, placing the ammonium dihydrogen phosphate and the sodium chloride in a beaker, adding 100mL of water, stirring the mixture until a clear solution is obtained, filtering the solution through filter paper, removing insoluble impurities, and standing the solution for later use to be marked as a solution B;
s3, adding 50mL of the solution B prepared in the step S2 into 100mL of the solution A prepared in the step S1, stirring for 30min to uniformly mix the solution A, adding an emulsifier consisting of 1g of cetyl trimethyl ammonium bromide and 0.4g of sodium dodecyl sulfate into the mixed solution, and stirring for 1h at 45 ℃ to form a water-in-oil emulsion solution which is marked as solution C;
s4, adding alumina and calcium carbonate into the solution C obtained in the step S3 to enable the mass ratio of the solution C to the alumina to be 10:2 and the mass ratio of the solution C to the calcium carbonate to be 10:1, heating the solution to 70 ℃, reacting for 2 hours, curing for 1 hour at 80 ℃, cooling to room temperature, filtering the obtained reaction liquid, taking the filtered powder material, and drying to obtain the re-ignition resistant type flame-retardant fire extinguishing agent.
Fig. 1 is an electron microscope image of the fire anti-afterburning type fire retardant extinguishing agent for power system prepared in this embodiment, and it can be seen from fig. 1 that the extinguishing agent prepared in this embodiment has a typical spherical structure.
Fig. 2 is a particle size distribution diagram of the anti-afterburning type fire retardant extinguishing agent applied to the fire of the power system, and as can be seen from fig. 2, the particle size of the extinguishing agent prepared in the embodiment is 100-6000 nm, and the particle size distribution is relatively concentrated, which indicates that the reaction synthesis is relatively uniform.
FIG. 3 is a TEM image of the fire anti-reburning type fire retardant extinguishing agent for power system prepared in this embodiment, wherein a-f in FIG. 3 represent the extinguishing agent under different magnifications, respectively; as can be seen from fig. 3, the inside and the outside of the fire extinguishing agent particles prepared by the embodiment have different densities, which meets the design requirements of the core-shell structure, and shows that the fire extinguishing agent prepared by the embodiment has the core-shell structure.
The afterburning-resistant type flame-retardant fire extinguishing agent applied to the power system fire has the structural characteristic of solid-in-water, but the appearance of the agent is still powdery and has good free-running property. The anti-afterburning type fire-extinguishing agent for fire disaster applied to the power system prepared in the embodiment is coated on a glass sheet of 3cm × 3cm × 40cm, and the fire-extinguishing agent is excited by a lighter to test the fire-extinguishing effect, and as a result, as shown in fig. 4, a is a state when a flame is excited in fig. 4, and b is a state when the fire-extinguishing agent extinguishes the flame. As can be seen from figure 4, the fire extinguishing agent prepared by the embodiment can quickly extinguish flame, and the fire extinguishing agent does not re-ignite after 15min, which shows that the fire extinguishing agent can play a good role in flame retardance and re-ignition resistance.
Examples 2 to 5
Examples 2 to 5 respectively provide a method for preparing an anti-afterburning type flame retardant fire extinguishing agent applied to a power system fire, which is different from example 1 in that the mass ratio of dimethyl phosphate to styrene in step S1 or the mass ratio of ammonium dihydrogen phosphate to sodium chloride in step S2 is changed, and the mass ratios corresponding to the respective examples are shown in table 1.
TABLE 1 respective mass ratios in step S1 and step S2 of examples 2-5
| Examples | Mass ratio of dimethyl phosphate to styrene | Mass ratio of ammonium dihydrogen phosphate to sodium chloride |
| Example 2 | 1:0.5 | 5:1 |
| Example 3 | 1:1.5 | 5:1 |
| Example 4 | 1:1 | 4:1 |
| Example 5 | 1:1 | 8:1 |
The fire extinguishing performance of the fire re-ignition resistant type fire extinguishing agent applied to the power system prepared in the embodiments 2-5 is tested, and the results show that the fire extinguishing agent prepared in the embodiments 2-5 has good fire extinguishing performance, can play a role in flame retardance and re-ignition resistance, and meets the requirements of practical application.
Comparing example 1 with examples 2-3, it can be seen that: along with the increase of the relative content of styrene and the decrease of the relative content of dimethyl phosphate in the wall material, the flame retardant property of the prepared fire extinguishing agent is reduced, and the application response temperature of the core material fire extinguishing agent is reduced. The gaps of the fire re-ignition resistant type flame retardant fire extinguishing agent prepared in the examples 1 to 3, which is applied to the power system, are tested, and the adsorption-desorption curves of the gaps are shown in fig. 5. In FIG. 5, — 1, -2, -3 represent the adsorption-desorption curves of the microcapsule wall material in examples 2, 1 and 3, i.e., the mass ratios of the phosphorus-containing polymeric flame retardant to styrene are 1:0.5, 1:1 and 1:1.5, respectively. As can be seen from FIG. 5, when the content of the phosphorus-containing polymeric flame retardant is different, the density of the wall material has a certain difference, that is, the adsorption capacity under each relative pressure increases with the decrease of the relative content of the flame retardant, which indicates that the void ratio of the fire extinguishing agent particles increases, thereby being beneficial to the exertion of the flame retardant effect. Therefore, in order to enable the prepared fire extinguishing agent to have a better flame retardant effect and a lower discharge response temperature, the mass ratio of dimethyl phosphate to styrene is preferably 1 (0.5-1.5), namely the mass ratio of the phosphorus-containing high-molecular flame retardant to styrene is preferably 1 (0.5-1.5).
FIG. 6 is an electron micrograph of the fire reignition-resistant fire retardant fire extinguishing agent applied to the power system prepared in examples 1-2 before and after fire extinguishing release, wherein a and b in FIG. 6 respectively show electron scanning images of the fire retardant fire extinguishing agent prepared in example 2 and the fire retardant fire extinguishing agent prepared in example 1 before fire extinguishing release; c. d represent electron scan images of the fire retardant extinguishing agent prepared in example 2 and example 1, respectively, after the fire extinguishing is released. As can be seen from fig. 6, after the fire extinguishing agents prepared in examples 1 to 2 are released, the fire retardant originally coated on the outer side of the core material explodes to release the inner core material, thereby realizing the fire extinguishing and suppression.
Comparing example 1 with examples 4-5, it can be seen that: with the increase of the relative content of ammonium dihydrogen phosphate and the decrease of the relative content of sodium chloride in the core material, the particle size of the prepared fire extinguishing agent powder tends to increase, but the temperature response speed is shortened, so that the fire extinguishing agent powder is beneficial to the quick release of the fire extinguishing agent. Therefore, the mass ratio of ammonium dihydrogen phosphate and sodium chloride in the mixing process is preferably (4-6): 1, comprehensively considering the particle size of the powder of the fire extinguishing agent and the corresponding speed of the temperature.
Examples 6 to 12
Examples 6 to 12 each provide a method for preparing a fire reignition-resistant fire retardant extinguishing agent for use in an electrical power system, which is different from example 1 in that the volume ratio of the solution B to the solution a in step S3, the mass ratio of the solution C to the alumina and calcium carbonate in step S4, or the reaction time at 70 ℃ in step S4 are changed, and the corresponding parameters of each example are shown in table 2.
TABLE 2 corresponding parameters in steps S3 and S4 of examples 6-12
The fire extinguishing performance of the fire re-ignition resistant type fire extinguishing agent applied to the power system prepared in the embodiments 6 to 12 is tested, and the results show that the fire extinguishing agent prepared in the embodiments 6 to 12 has good fire extinguishing performance, can play a role in flame retardance and re-ignition resistance, and meets the requirements of practical application.
Comparing example 1 with examples 6 to 7, it can be seen that: with the increase of the relative content of the wall materials and the decrease of the relative content of the core materials in the fire extinguishing agent, the prepared fire extinguishing agent has the advantages of reduced cooling effect, increased flame retardant property and relatively weakened re-combustion inhibiting effect. Therefore, in order to enable the fire extinguishing agent to have excellent flame retardant performance and anti-reburning effect at the same time, the volume ratio of the solution B to the solution A is preferably 1 (1-3).
Comparing example 1 with examples 8 to 12, it can be seen that: the mass ratio of the solution C to the alumina and the calcium carbonate in the step S4 and the reaction time of the reaction at 70 ℃ are adjusted, so that the stability of the prepared wall material applied to the anti-afterburning type fire retardant and extinguishing agent for the fire of the power system can be changed, and the thermal response temperature of the fire extinguishing agent can be adjusted. With the increase of the relative content of alumina, the decrease of the relative content of calcium carbonate and the increase of reaction time, the stability of the wall material of the prepared fire extinguishing agent is improved, and the range of the thermal response temperature tends to be increased, so that the thermal response temperature of the microcapsule fire extinguishing agent is increased. Therefore, in order to ensure that the fire extinguishing agent has a relatively proper thermal response temperature, the mass ratio of the solution C to the alumina is 10 (1-3), the mass ratio of the solution C to the calcium carbonate is 10 (0.5-1), and the reaction time at 70 ℃ is 1-3 h.
It should be noted that, those skilled in the art should understand that the phosphorus-containing polymeric flame retardant may be any one of dimethyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate, and trimethyl phosphite, and the afterburning-resistant fire-extinguishing agent applied to the fire of the power system, which is prepared by selecting any one of the above phosphorus-containing polymeric flame retardants, can achieve better flame-retardant effect and afterburning-resistant effect.
In conclusion, the phosphorus-containing high-molecular flame retardant with the flame-retardant effect and the styrene are taken as wall materials, the ammonium dihydrogen phosphate and the sodium chloride with the inhibiting effect are taken as core materials, and the core-shell flame-retardant fire-retardant extinguishing agent applied to the fire disaster of the power system can be prepared after emulsification and granulation. The wall material applied to the anti-reburning type fire retardant and extinguishing agent for the fire disaster of the power system, which is prepared by the invention, has the capacity of extinguishing an open fire, the core material of the wall material has the capacity of inhibiting the reburning of the fire disaster, and the extinguishing agent can realize the extinguishing and inhibition of the fire disaster by a mode of firstly extinguishing the open fire and then releasing an inhibitor; meanwhile, the fire extinguishing agent has targeting property, does not damage normal batteries, and only acts on thermal runaway batteries; the fire extinguishing agent does not need manual control, can be automatically activated and released at the initial stage of fire occurrence, and is favorable for improving the safety performance of a power system, particularly a lithium battery energy storage power station.
The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A preparation method of an anti-afterburning type flame-retardant fire extinguishing agent applied to a power system fire is characterized by comprising the following steps:
s1, mixing the phosphorus-containing high polymer flame retardant with styrene according to a preset mass ratio of 1 (0.5-1.5), and dissolving the mixture in a chloroform solvent for later use, and marking as a solution A; the phosphorus-containing high polymer flame retardant is any one of dimethyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate and trimethyl phosphite;
s2, mixing ammonium dihydrogen phosphate and sodium chloride according to a mass ratio of (4-8): 1, dissolving in water, filtering impurities, and taking a clear liquid for later use as a solution B;
s3, uniformly mixing the solution B prepared in the step S2 and the solution A prepared in the step S1 according to the volume ratio of 1 (1-3) to obtain a mixed solution, adding an emulsifier into the mixed solution, and fully stirring to form a water-in-oil emulsion solution which is marked as solution C; the emulsifier is a mixture of cetyl trimethyl ammonium bromide and sodium dodecyl sulfate;
s4, adding a predetermined amount of aluminum oxide and calcium carbonate into the solution C prepared in the step S3 to enable the mass ratio of the solution C to the aluminum oxide to be 10 (1-3), the mass ratio of the solution C to the calcium carbonate to be 10 (0.5-1), filtering after the reaction is completed, taking the filtered powder material, and drying to obtain the re-ignition resistant type flame-retardant fire extinguishing agent; the particle size of the anti-afterburning type flame-retardant fire extinguishing agent is 100-6000 nm; the reaction comprises the following processes: firstly heating to 70 ℃, reacting for 1-3 h, curing for 1h at 80 ℃, and then cooling to room temperature.
2. The utility model provides an anti after-combustion type fire retardant extinguishing agent who is applied to electric power system conflagration which characterized in that: the anti-afterburning type flame-retardant fire extinguishing agent applied to the fire of the power system is prepared according to the preparation method of claim 1, comprises a core material and a wall material coated on the outer side of the core material, and is of a core-shell structure; the core material comprises ammonium dihydrogen phosphate and sodium chloride, and the wall material comprises a phosphorus-containing high-molecular flame retardant and styrene.
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