Slow-inhibition aerosol fire extinguishing agent and preparation method thereof

Abstract

The present invention provides a slow-suppression aerosol fire extinguishing agent and a preparation method thereof, comprising the following components by mass percentage: 60-70% oxidant, 10-30% reductant, 5-10% adhesive and 5-10% regulator; wherein; the adhesive is a mixture of one or more of epoxy resin, polyazide glycidyl ether, polynitrate glycidyl ether or alkenyl polyethylene glycol; the regulator is one or more of wood powder, bentonite or clay. The aerosol fire extinguishing agent slows down the spraying speed of the agent by adding an appropriate amount of regulator. However, the amount of regulator needs to be controlled to ensure that the gas production per unit time of the fire extinguishing agent remains sufficient. If the amount of regulator is too much, the agent itself will be difficult to ignite. The composite effect formed by adding multiple adhesives in the present invention greatly increases the energy content of the adhesive, thereby achieving the effects of easy ignition, uniform gas production and slow spraying speed.

Description

Technical Field

[0001] The invention belongs to the technical field of fire fighting and extinguishing, and in particular relates to a slow-inhibiting aerosol fire extinguishing agent and a preparation method thereof. Background Art

[0002] Aerosol fire extinguishing agent is a new type of fire extinguishing agent, which has the advantages of environmental protection, fast fire extinguishing, long-lasting effect, low price, wide fire extinguishing range, etc. In particular, its ozone depletion potential (ODP) and greenhouse effect potential (GWP) are very low, it can be stored at normal pressure, and the engineering cost is low. It has developed rapidly in recent years. Aerosol fire extinguishing agent is a kind of pyrotechnic powder, which is composed of oxidant, reductant and adhesive. It produces a large amount of fire extinguishing medium through combustion reaction, which is evenly distributed in the protected space, and extinguishes the fire through the dual synergistic effect of physics and chemistry. After the aerosol enters the flame, due to the very small colloidal particles and the very large specific surface area, it is very easy to absorb heat from the flame and increase the temperature. After reaching a certain temperature, the solid particles melt, gasify and decompose to absorb a large amount of heat, and the liquid droplets also absorb heat and heat or gasify at the same time. It has a long effective retention time, fast reaction and can be repeated, so it has the ability to extinguish fire instantly and can effectively prevent the occurrence of re-fire.

[0003] The common aerosol fire extinguishing agents on the market are all fast-acting agents, which pursue rapid fire extinguishing. All the agents are sprayed out in a short time, so as to achieve the purpose of extremely large gas production in a short time and extinguish the fire in a full flooding manner.

[0004] This method is more suitable for fire extinguishing in a fully enclosed environment. Therefore, in actual application, if the use environment is semi-enclosed, narrow, open-air environment or other factors affected by external conditions, then after the aerosol is completely submerged to extinguish the fire in a short period of time, the fire extinguishing concentration will drop rapidly, which means there is a risk of re-ignition of the fire that cannot be suppressed or the fire spreading. Summary of the invention

[0005] The invention provides a slow-inhibiting aerosol fire extinguishing agent and a preparation method thereof; the aerosol fire extinguishing agent can realize slow, continuous and sufficient gas production, and achieve the effect of continuous fire extinguishing.

[0006] The technical solution of the present invention is a slow-inhibition aerosol fire extinguishing agent, which comprises the following components by mass percentage: 60-70% oxidant, 10-30% reductant, 5-10% adhesive and 5-10% regulator.

[0007] Furthermore, the oxidant is one or more of potassium chlorate, potassium perchlorate, potassium nitrate or sodium nitrate.

[0008] Furthermore, the reducing agent is one or more of dicyandiamide, urea or 5-aminotetrazole.

[0009] Furthermore, the adhesive is a mixture of epoxy resin and one or more of polyazide glycidyl ether, polynitrate glycidyl ether or alkenyl polyethylene glycol, wherein the epoxy resin accounts for 4-8% of the aerosol fire extinguishing agent.

[0010] Furthermore, the regulator is one or more of wood powder, bentonite or clay.

[0011] The present invention also relates to a method for preparing the slow-inhibiting aerosol fire extinguishing agent, comprising the following steps:

[0012] S1. Screen all raw materials and then mix them according to the proportion;

[0013] S2, add ethanol and deionized water to the material obtained in S1, and mix well;

[0014] The materials obtained in S3 and S2 are granulated using a screen and then dried to obtain the product.

[0015] Furthermore, the sieve used for screening in S1 is 60-120 mesh, and the mixed raw materials are screened and mixed repeatedly using the sieve.

[0016] Furthermore, the total amount of ethanol and deionized water added to S2 is 5% to 15% of the mass of the aerosol fire extinguishing agent.

[0017] Furthermore, the screen in S3 has a mesh size of 10-20.

[0018] Furthermore, during drying, the temperature is 40-60° C., and the drying is performed until the volatile matter content is less than 1%.

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

[0020] The aerosol fire extinguishing agent reduces the burning rate of the agent itself and slows down the speed of the agent spraying by adding an appropriate amount of regulator. The amount of regulator needs to be controlled to ensure that the gas production per unit time of the fire extinguishing agent remains sufficient. If the regulator is used in excessive amounts, the agent itself will be difficult to ignite. The present invention adds a combination of multiple adhesives, and the oxygen content and energy content on the molecular side chains of groups such as azide and nitro are very high. The high oxygen content can adjust the oxygen balance during the combustion process, and the high energy content can also reduce the amount of other regulators used, reduce the sensitivity of the agent itself, and release more energy during combustion. It can still ignite after adding a quantitative regulator, thereby achieving the effect of uniform gas production, slow spraying speed, and easy ignition. DETAILED DESCRIPTION

[0021] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0022] Example 1

[0023] The fire extinguishing agent consists of: 70% oxidant (potassium nitrate); 15% reducing agent (urea); 8% adhesive (6% epoxy resin, 2% polyazide glycidyl ether); and 7% regulator (2% wood powder, 5% clay).

[0024] Each raw material is sieved to less than 120 mesh, and the sieved raw materials are weighed according to a certain mass ratio. The sieved raw materials are pre-mixed, and then dispersed and sieved repeatedly with a 120-mesh sieve. A mixed solution of 5% ethanol and 7% water by mass of the aerosol fire extinguishing agent is added to the evenly mixed dry material as a solvent, and mixed evenly to fully dissolve and disperse the adhesive. The mixed wet material is sieved and granulated to less than 20 mesh. The granulated powder is transferred to the drying room, the temperature is set to 50-60°C, and the aerosol fire extinguishing agent A1 is obtained after drying to a volatile content of less than 1%. The fire extinguishing agent is pressed into a powder column, and the bare powder column is sprayed and tested, and a wood pile fire Class A fire extinguishing experiment is carried out according to UL Standard for Safety Fixed Condensed Aerosol Extinguishing System Units (UL 2775 2019-07 Fixed Condensed Aerosol Fire Extinguishing System Device Standard).

[0025] Example 2

[0026] The fire extinguishing agent consists of: 65% oxidant (potassium perchlorate); 23% reducing agent (dicyandiamide); 6% adhesive (5% epoxy resin, 1% polynitrate glycidyl ether); 6% regulator (1% wood powder, 5% bentonite).

[0027] Aerosol fire extinguishing agent A2 was prepared in the manner of Example 1 and pressed into a powder column, and a spray test was performed on the bare powder column.

[0028] Example 3

[0029] The fire extinguishing agent consists of: 60% oxidant (60% potassium chlorate); 30% reducing agent (30% 5-aminotetrazole); 5% adhesive (4% epoxy resin, 1% alkenyl polyethylene glycol); and 5% regulator (2% clay, 3% bentonite).

[0030] Aerosol fire extinguishing agent A3 was prepared in the manner of Example 1, and the fire extinguishing agent was pressed into a powder column, and a spraying test was performed on the bare powder column.

[0031] Example 4

[0032] The fire extinguishing agent consists of: 70% oxidant (50% potassium nitrate, 20% sodium nitrate); 15% reducing agent (dicyandiamide); 8% adhesive (4% epoxy resin, 2% polyazide glycidyl ether, 2% polynitrate glycidyl ether); 7% regulator (2% wood powder, 5% bentonite).

[0033] Aerosol fire extinguishing agent A4 was prepared in the manner of Example 1 and pressed into a powder column, and a spray test was performed on the bare powder column.

[0034] Example 5

[0035] The fire extinguishing agent consists of: 70% oxidant (50% sodium nitrate, 20% potassium chlorate); 15% reducing agent (10% urea, 5% 5-aminotetrazole); 8% adhesive (6% epoxy resin, 2% polynitrate glycidyl ether); 7% regulator (bentonite).

[0036] Aerosol fire extinguishing agent A5 was prepared in the manner of Example 1, the fire extinguishing agent was pressed into a powder column, and a spray test was performed on the bare powder column.

[0037] Comparative Example 1

[0038] Fire extinguishing agent composition: 70% oxidant (70% potassium nitrate); 22% reducing agent (22% urea); 8% adhesive (8% epoxy resin).

[0039] Aerosol fire extinguishing agent B1 was prepared in the manner of Example 1, and the fire extinguishing agent was pressed into a powder column, and a spraying test was performed on the bare powder column.

[0040] Comparative Example 2

[0041] Fire extinguishing agent composition: 70% oxidant (70% potassium nitrate); 15% reducing agent (15% urea); 8% adhesive (8% epoxy resin); 7% regulator (2% wood powder, 5% clay).

[0042] Aerosol fire extinguishing agent B2 was prepared in the manner of Example 1, and the fire extinguishing agent was pressed into a powder column, and a spraying test was performed on the bare powder column.

[0043] Comparative Example 3

[0044] Fire extinguishing agent composition: 70% oxidant (potassium nitrate); 22% reducing agent (urea); 8% adhesive (6% epoxy resin, 2% polyazide glycidyl ether).

[0045] Aerosol fire extinguishing agent B3 was prepared in the manner of Example 1, and the fire extinguishing agent was pressed into a powder column, and a spray test was performed on the bare powder column.

[0046] Comparative Example 4

[0047] The fire extinguishing agent consists of: 65% oxidant (65% potassium perchlorate); 23% reducing agent (dicyandiamide); 6% adhesive (6% polynitrate glycidyl ether); 6% regulator (1% wood powder, 5% bentonite).

[0048] Aerosol fire extinguishing agent B4 was prepared in the manner of Example 1, and the fire extinguishing agent was pressed into a powder column, and a spray test was performed on the bare powder column.

[0049] The performance characterization data of the aerosol fire extinguishing agents obtained in the above examples and comparative examples are shown in Table 1 below.

[0050] Table 1

[0051]

[0052] The embodiment and comparative example in the above table data reflect the different experimental results of the spray test and wood pile fire Class A fire extinguishing test of the embodiment aerosol fire extinguishing agent and the comparative example aerosol fire extinguishing agent. It can be seen that the aerosol fire extinguishing agent without adding a composite binder will reignite within 1 minute after the fire extinguishing test, and the aerosol fire extinguishing agent itself cannot be ignited after adding a certain proportion of a regulator. The embodiment can solve the risk of difficult ignition caused by the addition of a higher regulator by adding an energetic binder for composite use. The energy content is higher, and the fire extinguishing concentration has certain advantages compared with the comparative example, realizing the advantages of easy ignition of the agent, stable combustion process, and sufficient gas production, so as to achieve continuous fire extinguishing and prevent reignition.

[0053] The above embodiments are only for illustrating the technical ideas and features of the present invention, and the contents are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Within the technical scope disclosed by the present invention, equivalent changes or improvements made according to the technical solution and inventive concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A slow-inhibiting aerosol fire extinguishing agent, characterized in that: The aerosol fire extinguishing agent comprises the following components in percentage by mass: 60-70% oxidant, 10-30% reductant, 5-10% adhesive and 5-10% regulator; the adhesive is a mixture of epoxy resin and one or more of polyazide glycidyl ether, polynitrate glycidyl ether or alkenyl polyethylene glycol; the mass proportion of epoxy resin in the aerosol fire extinguishing agent is 4-8%; the regulator is one or more of wood powder, bentonite or clay; the oxidant is one or more of potassium chlorate, potassium perchlorate, potassium nitrate or sodium nitrate; the reductant is one or more of dicyandiamide, urea or 5-aminotetrazole.

2. The method for preparing the slow-inhibiting aerosol fire extinguishing agent according to claim 1, characterized in that: The following steps are involved: S1. Screen all raw materials and then mix them according to the proportion; S2, add ethanol and deionized water to the material obtained in S1, and mix well; The materials obtained in S3 and S2 are granulated using a screen and then dried to obtain the product.

3. The preparation method according to claim 2, characterized in that: The sieve used in S1 is 60-120 mesh, and the mixed raw materials are screened and mixed repeatedly using the sieve.

4. The preparation method according to claim 2, characterized in that: The total amount of ethanol and deionized water added to S2 is 5-15% of the mass of the aerosol fire extinguishing agent.

5. The preparation method according to claim 2, characterized in that: The screen in S3 is 10-20 mesh; during drying, the temperature is 40-60°C, and it is dried until the volatile content is less than 1%.

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