High-insulation low-corrosion pulse-type aerosol fire extinguishing agent and preparation method therefor

Abstract

Provided in the present invention are a high-insulation low-corrosion pulse-type aerosol fire extinguishing agent and a preparation method therefor. The fire extinguishing agent comprises the following components in parts by mass: 60-80 parts of an oxidizing agent, 10-30 parts of a reducing agent, 5-10 parts of an adhesive, 1-5 parts of a lubricating agent, and 1-5 parts of an auxiliary agent, wherein the auxiliary agent is polyacrylonitrile and / or polyvinylpyrrolidone; the oxidizing agent is strontium nitrate; the reducing agent is agarose and / or lignin; the adhesive is a furan resin and / or melamine resin; and the lubricating agent is boron carbide. The fire extinguishing agent has the characteristics of high strength, low density and a high burning rate, and has a greatly improved fire extinguishing capability, and effectively reduces the fire extinguishing concentration of an S-type aerosol agent.

Description

High-insulation, low-corrosion pulse-type aerosol fire extinguishing agent and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of fire fighting and extinguishing, and particularly relates to a high-insulation, low-corrosion pulse-type aerosol fire extinguishing agent and a preparation method thereof. Background Art

[0002] As the application of aerosol fire extinguishing technology expands, the market is placing higher demands on the insulation and corrosive properties of aerosol fire extinguishing agents. Compared to K-type aerosol agents, S-type aerosol agents, which use strontium nitrate as the primary oxidant, have attracted widespread attention due to their higher insulation strength and lower corrosiveness. However, S-type aerosol agents have lower fire extinguishing capabilities. Specifically, in a given protected area, the amount of S-type aerosol required is greater than that of K-type aerosols, and the S-type aerosol fire extinguishing equipment also occupies a larger space. Therefore, fire extinguishing capability has become a significant obstacle to its development.

[0003] Summary of the Invention

[0004] The present invention provides a high-insulation, low-corrosion pulse-type aerosol fire extinguishing agent and a preparation method thereof, which achieves an aerosol spray pulse effect. The prepared fire extinguishing agent column has the characteristics of high strength, low density and fast burning rate, greatly improving the fire extinguishing ability and effectively reducing the fire extinguishing concentration of the S-type aerosol agent.

[0005] The technical solution of the present invention is a high-insulation, low-corrosion pulse-type aerosol fire extinguishing agent, which includes the following components by mass: 60-80 parts of oxidant, 10-30 parts of reducing agent, 5-10 parts of adhesive, 1-5 parts of lubricant and 1-5 parts of auxiliary agent; wherein the auxiliary agent is polyacrylonitrile and / or polyvinyl pyrrolidone.

[0006] Furthermore, the oxidant is strontium nitrate.

[0007] Furthermore, the reducing agent is agarose and / or lignin.

[0008] Furthermore, the adhesive is furan resin and / or melamine resin.

[0009] Furthermore, the lubricant is boron carbide.

[0010] The present invention also relates to a method for preparing the high-insulation, low-corrosion pulse-type aerosol fire extinguishing agent, comprising the following steps:

[0011] S1, dissolving the adhesive with solvent 1 to obtain an adhesive solution;

[0012] S2, dissolving the adjuvant with solvent 2 to obtain an adjuvant solution;

[0013] S3, pouring the auxiliary agent solution into the adhesive solution and stirring thoroughly to obtain a mixed liquid;

[0014] S4, mixing the oxidizing agent, the reducing agent and the lubricant and sieving them to obtain a mixture;

[0015] S5. Add the prepared mixed liquid to the mixture and stir to mix; granulate and dry to obtain aerosol agent particles, and finally use a mold to press and shape to obtain a pulse aerosol fire extinguishing agent column.

[0016] Furthermore, the solvent 1 is ethanol, and its added amount is 2-5% of the total mass of the aerosol fire extinguishing agent.

[0017] Furthermore, the solvent 2 is dimethyl sulfoxide, and its addition amount is 1-2% of the total mass of the aerosol fire extinguishing agent. Furthermore, during the granulation in S5, a 20-40 mesh screen is used for granulation, and the granulation is dried at 50-60°C.

[0018] Furthermore, during the mold pressing in S5, the pressure is 1-2 MPa.

[0019] The present invention has the following beneficial effects:

[0020] 1. In the fire extinguishing agent provided by the present invention, strontium nitrate is used as an oxidant, which has higher dielectric strength and lower corrosiveness, but its fire extinguishing ability is limited. By adding an auxiliary agent, its spatial network structure is maintained in the agent, which serves as a skeleton when the powder column is pressed. Other components are attached to the auxiliary agent through the action of force, ensuring the integrity of the powder column when pressed under low pressure.

[0021] 2. The present invention utilizes low pressure during the formation of the charge column. This not only reduces the pressure on the charge particles and improves the safety of the charge column forming process, but also makes the resulting charge column fluffy and low-density, accelerating the charge's combustion rate and producing a pulse effect. This increases airflow disturbance within the protected space, making it easier for the aerosol fire extinguishing medium to reach the flame root, increasing the local concentration of effective fire extinguishing particles and improving fire extinguishing capability. Furthermore, due to the faster charge combustion rate, more solid particles are ejected with the gas, resulting in less residue after the fire extinguishing device is discharged. This solves the problem of traditional aerosol agents being trapped in the residue, allowing more fire extinguishing medium to be released, significantly improving fire extinguishing capability. Overall, the aerosol charge column obtained by low-density pressing has a faster combustion rate, higher fire extinguishing capability, and is more in line with the needs of practical applications. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0023] Example 1

[0024] Dissolve 7 parts of furan resin in 5 parts of ethanol and mix well to obtain a furan resin solution. Then, dissolve 4 parts of polyacrylonitrile in 2 parts of dimethyl sulfoxide to obtain a polyacrylonitrile solution. Pour the polyacrylonitrile solution into the furan resin solution and stir thoroughly to obtain a mixed solution. Weigh 65 parts of strontium nitrate, 20 parts of agarose, and 4 parts of boron carbide and pass them through a 100-mesh sieve and mix. Pour the prepared mixed solution into the above mixture and stir to mix evenly. Then, pass the mixture through a 20-mesh sieve to granulate it and dry it at 50°C to obtain aerosol fire extinguishing agent particles. Finally, use a special mold to press the fire extinguishing agent particles into a 25 mm diameter column at a pressure of 1 MPa.

[0025] Example 2

[0026] Dissolve 5 parts of furan resin in 4 parts of ethanol and mix thoroughly to obtain a furan resin solution. Dissolve 4 parts of polyacrylonitrile in 2 parts of dimethyl sulfoxide to obtain a polyacrylonitrile solution. Pour the polyacrylonitrile solution into the furan resin solution and stir thoroughly to obtain a mixed solution. Weigh 70 parts of strontium nitrate, 17 parts of agarose, and 4 parts of boron carbide through a 100-mesh sieve and mix. Pour the prepared mixed solution into the above mixture and stir to mix thoroughly. Then, pass the mixture through a 40-mesh sieve to form granules and dry at 60°C to obtain aerosol fire extinguishing agent granules. Finally, press the granules into 25 mm diameter pellets using a dedicated mold at a pressure of 1 MPa.

[0027] Example 3

[0028] Dissolve 7 parts of furan resin in 5 parts of ethanol and mix well to obtain a furan resin solution. Then dissolve 2 parts of polyacrylonitrile in 1 part of dimethyl sulfoxide to obtain a polyacrylonitrile solution. Pour the polyacrylonitrile solution into the furan resin solution and stir thoroughly to obtain a mixed solution. Weigh 75 parts of strontium nitrate, 14 parts of agarose, and 2 parts of boron carbide and pass them through a 100-mesh sieve and mix. Pour the prepared mixed solution into the above mixture and stir to mix evenly. Then, pass it through a 20-mesh sieve to granulate it and dry it at 50°C to obtain aerosol fire extinguishing agent particles. Finally, use a special mold to press the above fire extinguishing agent particles into a 25 mm diameter column at a pressure of 2 MPa.

[0029] Example 4

[0030] Dissolve 5 parts of furan resin in 4 parts of ethanol and mix well to obtain a furan resin solution. Then dissolve 2 parts of polyacrylonitrile in 1 part of dimethyl sulfoxide to obtain a polyacrylonitrile solution. Pour the polyacrylonitrile solution into the furan resin solution and stir thoroughly to obtain a mixed solution. Weigh 80 parts of strontium nitrate, 11 parts of agarose, and 2 parts of boron carbide and mix through a 100-mesh sieve. Pour the prepared mixed solution into the above mixture and stir to mix evenly. Then, granulate it through a 20-mesh sieve and dry it at 50°C to obtain aerosol fire extinguishing agent particles. Finally, use a special mold to press the above fire extinguishing agent particles into a 25 mm diameter column at a pressure of 2 MPa.

[0031] Example 5

[0032] Dissolve 5 parts of melamine resin in 4 parts of ethanol and mix thoroughly to obtain a melamine resin solution. Dissolve 2 parts of polyvinyl pyrrolidone in 1 part of dimethyl sulfoxide to obtain a polyvinyl pyrrolidone solution. Pour the polyvinyl pyrrolidone solution into the melamine resin solution and stir thoroughly to obtain a mixed solution. Weigh 80 parts of strontium nitrate, 11 parts of lignin, and 2 parts of boron carbide, pass through a 100-mesh sieve, and mix. Pour the prepared mixed solution into the above mixture, stir to mix thoroughly, then pass through a 40-mesh sieve to granulate, and dry at 60°C to obtain aerosol fire extinguishing agent particles. Finally, press the fire extinguishing agent particles into a 25 mm diameter pellet using a dedicated mold at a pressure of 2 MPa.

[0033] Comparative Example 1

[0034] The method and steps are the same as in Example 1, except that the pressing pressure "1 MPa" is replaced by "6 ​​MPa".

[0035] Comparative Example 2

[0036] Dissolve 7 parts furan resin in 5 parts ethanol and mix thoroughly to obtain a furan resin solution. Weigh 65 parts strontium nitrate, 24 parts agarose, and 4 parts boron carbide and pass through a 100-mesh sieve before mixing. Pour the prepared furan resin solution into the above mixture and stir to mix thoroughly. Then, pass the mixture through a 20-mesh sieve to form granules and dry at 50°C to obtain aerosol fire extinguishing agent granules. Finally, press the granules into 25 mm diameter pellets using a dedicated mold at a pressure of 2 MPa.

[0037] Comparative Example 3

[0038] The method and steps are the same as those in Comparative Example 2, except that the pressing pressure "2MPa" is replaced by "6MPa".

[0039] Aerosol fire extinguishing agent pellets pressed into high-density pellets have a slow burning rate and low fire extinguishing capability. However, directly using low-density pressing to produce aerosol pellets with a faster burning rate results in pellet formation problems, which seriously hinders pellet production and use. Adding an auxiliary agent to the aerosol fire extinguishing agent helps maintain the integrity of the pellet, solving the pellet formation problem during low-density pressing. This results in a fast-discharging aerosol fire extinguishing agent with high insulation and low corrosion properties.

[0040] The effect data of the samples obtained in the above examples and comparative examples are shown in Table 1 below. Among them, the fire extinguishing concentration of the prepared 50g aerosol column is 0.3m 3 , 0.4m 3 , 0.5m 3 , 0.8m 3 and 1.0m 3 The results were calculated after testing in a fire model. The dielectric strength of the aerosol spray was determined by testing the resistance at a 10mm spacing after exposure to the spray at 35°C and 90% relative humidity for 30 minutes. The corrosion resistance of the spray to the copper plate was determined by observing the color of the copper plate after exposure to the spray at 30°C and 85% relative humidity for 24 hours.

[0041] Table 1

[0042] The above table shows the pressing and molding conditions, burning time, fire extinguishing ability, insulation strength and corrosiveness of the 50g aerosol powder column prepared in each embodiment and comparative example. The sprayed material of the prepared 50g aerosol powder column has the properties of high insulation and low corrosion, with an insulation resistance of more than 2200MΩ, and the copper plate for collecting the sprayed material is not corroded or discolored. In addition, compared with the high-density powder column, the burning rate and fire extinguishing ability of the low-density powder column prepared by the present invention under lower pressure are significantly enhanced. The addition of auxiliary agents solves the problem of difficult powder column molding caused by pressing under low pressure conditions, so that low-density pulse-type powder columns can be applied to actual scenarios.

[0043] The above embodiments are merely illustrative of the technical concepts and features of the present invention. The contents described are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Within the technical scope disclosed by the present invention, equivalent changes or improvements based on the technical solutions and inventive concepts of the present invention are all encompassed within the scope of protection of the present invention.

Claims

1. A high insulation, low corrosion pulse aerosol fire extinguishing agent, characterized in that: The invention comprises the following components in parts by mass: 60-80 parts of an oxidant, 10-30 parts of a reducing agent, 5-10 parts of an adhesive, 1-5 parts of a lubricant and 1-5 parts of an auxiliary agent; wherein the auxiliary agent is polyacrylonitrile and / or polyvinyl pyrrolidone.

2. The flameless thermal aerosol fire extinguishing agent according to claim 1, characterized in that: The oxidant is strontium nitrate.

3. The flameless thermal aerosol fire extinguishing agent according to claim 1, characterized in that: The reducing agent is agarose and / or lignin.

4. The flameless thermal aerosol fire extinguishing agent according to claim 1, characterized in that: The adhesive is furan resin or melamine resin.

5. The flameless thermal aerosol fire extinguishing agent according to claim 1, characterized in that: The lubricant is boron carbide.

6. The method for preparing the high-insulation, low-corrosion pulse-type aerosol fire extinguishing agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, dissolving the adhesive with solvent 1 to obtain an adhesive solution; S2, dissolving the auxiliary agent with solvent 2 to obtain an auxiliary agent solution; S3, pouring the auxiliary agent solution into the adhesive solution, and stirring thoroughly to obtain a mixed liquid; S4, mixing the oxidant, the reducing agent and the lubricant and sieving them to obtain a mixture; S5, adding the prepared mixed liquid to the mixture and stirring to mix; granulating and drying to obtain aerosol agent particles, and finally using a mold to press and shape to obtain a pulse aerosol fire extinguishing agent column.

7. The preparation method according to claim 6, characterized in that: The solvent 1 is ethanol, and the amount of ethanol added is 2-5% of the total mass of the aerosol fire extinguishing agent.

8. The preparation method according to claim 6, characterized in that: Solvent 2 is dimethyl sulfoxide, and its added amount is 1-2% of the total mass of the aerosol fire extinguishing agent.

9. The preparation method according to claim 6, characterized in that: In S5, a 20-40 mesh screen is used for granulation, and the granulation is carried out at 50-60°C.

10. The preparation method according to claim 6, characterized in that: When the mold is pressed in S5, the pressure is 1-2MPa.

Images