Chemical coolant and use thereof in aerosol-based fire extinguishing

Abstract

Provided in the present invention are a chemical coolant and the use thereof in aerosol-based fire extinguishing. The chemical coolant comprises the following components in percentage by mass: 20-70% of an organic flame retardant, 20-70% of a phosphate, 2-10% of a binder, and 2-40% of an additive. In the present invention, by adding a phosphate which is liable to undergo a decomposition reaction and has a fire extinguishing capacity to the coolant, not only can the temperature of an aerosol outlet be effectively reduced, but the concentration of an aerosol is also increased, the fire extinguishing capacity of an aerosol fire-extinguishing agent is thus improved, and a very small amount of final residues are generated; moreover, a given amount of a potassium-containing substance can be further added to the coolant, so as to increase the concentration of a potassium salt in the aerosol and improve the fire extinguishing capacity.

Description

A chemical coolant and its application in aerosol fire extinguishing Technical Field

[0001] The invention belongs to the technical field of fire fighting and extinguishing, and in particular relates to a chemical coolant and an application thereof in aerosol fire extinguishing. Background Art

[0002] As a new fire extinguishing agent, thermal aerosol fire extinguishing agents face a significant challenge in their application: the potential for secondary damage during the fire extinguishing process. Thermal aerosol fire extinguishing agents produce aerosols through an exothermic combustion reaction, resulting in high temperatures. Without cooling measures, flames or sparks can be ejected from the extinguishing device, causing the temperature of the protected space to rise and potentially ignite combustible materials. High-temperature aerosols can cause significant harm or damage to people and objects within the protected space. Furthermore, high temperatures can easily lead to uneven spatial distribution of the aerosols, compromising fire extinguishing effectiveness.

[0003] To eliminate the high-temperature flames generated by the combustion reaction, the most feasible and effective method currently is to add a heat-absorbing coolant into the hot aerosol path. This significantly reduces the aerosol temperature, potentially from 1000°C to below 400°C. This method does not alter the redox reaction rate of the extinguishing agent, nor does it affect the agent's ignition and combustion properties. The added coolant utilizes the heat generated by the extinguishing reaction to decompose. Simultaneously, the coolant itself decomposes to generate new aerosol components, such as phosphates and inert gases (N2, CO2). This increases aerosol concentration, helps improve fire extinguishing efficiency, and eliminates the emission of flames and residue from the product.

[0004] The inventors' investigations revealed that existing coolants, primarily composed of organic components, are ineffective in reducing aerosol outlet temperatures and improving fire extinguishing capabilities. Furthermore, they fail to meet the safety requirements for use in various practical scenarios, placing higher demands on coolant design. They fail to fully utilize the high aerosol outlet temperature to generate new aerosol materials with high fire extinguishing capabilities. Furthermore, existing coolants offer suboptimal cooling and fire extinguishing capabilities, resulting in high outlet temperatures for aerosol fire extinguishing agents and inadequate fire extinguishing capabilities.

[0005] Summary of the Invention

[0006] The present invention provides a chemical coolant and its application in aerosol fire extinguishing. By adding phosphates that are prone to decomposition reactions and have fire extinguishing capabilities to the coolant, the present invention can not only effectively reduce the aerosol outlet temperature, but also increase the aerosol concentration, thereby improving the fire extinguishing capability of the aerosol fire extinguishing agent, and ultimately producing very little residue.

[0007] The technical solution of the present invention is a chemical coolant comprising the following components by mass percentage: 20-70% organic flame retardant, 20-70% phosphate, 2-40% additive and 2-10% binder.

[0008] Furthermore, the organic flame retardant is one or more of melamine, nitroguanidine, guanidine nitrate, dicyandiamide, azodicarbonamide, sulfaguanidine, aminoguanidine, acetylguanidine, guanidine phosphate, guanidine chlorophenol, guanidine sulfate, methylguanamine, aminoguanidine sulfate, guanidineacetic acid, o-phenylenediamine, trimethylamine oxide, cystine, acetanilide, acetamide, sulfonamide and acetazolamide.

[0009] Furthermore, the phosphate is one or more of ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium polyphosphate, calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, sodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate dihydrate, potassium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, aluminum phosphate, aluminum dihydrogen phosphate, zinc dihydrogen phosphate, manganese dihydrogen phosphate, magnesium dihydrogen phosphate, and magnesium hydrogen phosphate.

[0010] Furthermore, the binder is one or more of hydroxypropyl methylcellulose, ethyl cellulose, methyl cellulose, hydroxyethyl methyl cellulose, phenolic resin, epoxy resin, shellac, starch, sorbitol, glucose, dextrin and rubber.

[0011] More preferably, the chemical coolant comprises 30-60% organic flame retardant, 20-50% phosphate, 2-8% binder and 5-40% additive.

[0012] The additive is one or more of potassium nitrate, potassium bicarbonate, potassium carbonate, potassium chloride, potassium bromide, potassium sulfate, potassium fluoroaluminate, potassium hydrogen phthalate, dipotassium phthalate, potassium hydrogen terephthalate, potassium salicylate, potassium hydrogen tartrate, potassium oxalate, potassium citrate, potassium gluconate, potassium stearate, and potassium sorbate.

[0013] The present invention also relates to a method for preparing the chemical coolant, which is characterized by comprising the following steps:

[0014] S1. The raw materials are crushed and sieved, then dried, mixed according to proportion, and methanol is added to mix;

[0015] The materials obtained in S2 and S1 are granulated through a screen and dried to obtain coolant granules;

[0016] The coolant granules obtained in S3 and S2 are tableted by a tablet press to obtain columnar coolant particles.

[0017] The tableting pressure is preferably 8-10 MPa, and the column size is preferably Φ6×5.5 mm.

[0018] Furthermore, when sieving after crushing, the screen is 80-100 mesh; when sieving after granulation, the screen is 20 mesh, the drying temperature is 80° C., and the drying time is 12 hours.

[0019] Furthermore, the amount of methanol added is 10-16% of the mass of the material.

[0020] The invention also relates to the use of the chemical coolant in an aerosol fire extinguisher.

[0021] The present invention has the following beneficial effects:

[0022] The coolant provided by the present invention uses an organic flame retardant as its primary raw material, which decomposes to produce inert gases such as CO2, N2, and H2O. These gases contribute to fire extinguishing and enhance the dispersibility of the aerosol. The added phosphate undergoes endothermic decomposition at high temperatures, producing volatile decomposition products. These react chemically with free radicals or reactive groups such as H·, HO·, and O· generated during the combustion process, resulting in a negative catalytic effect, interrupting the combustion chain reaction and extinguishing the fire. Furthermore, the phosphate powder settles on the surface of the combustible material, undergoes a chemical reaction, and at high temperatures forms a glassy coating that isolates oxygen, thereby suffocating the fire. The K-containing additive produces inert gases such as CO2 and H2O, as well as K oxides, during the endothermic decomposition reaction. The inert gases reduce oxygen concentration and isolate oxygen, while the K oxides trap free radicals such as H·, HO·, and O·, causing the free radicals in the flame to be consumed at a rate greater than their production. This rapidly depletes the combustion free radicals, terminating the chain reaction. The decomposition products of the coolant increase the aerosol concentration, which synergizes with the aerosol generated by the aerosol generator to extinguish the fire. The organic flame retardants, phosphates, and K additives also absorb a large amount of heat during decomposition, effectively reducing the device's nozzle temperature. DETAILED DESCRIPTION

[0023] 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.

[0024] Example 1

[0025] Coolant composition: 70% melamine, 20% diammonium phosphate, 8% potassium oxalate and 2% methyl cellulose.

[0026] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried melamine, ammonium dihydrogen phosphate, potassium salicylate and methyl cellulose are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 14% of the total material mass of methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0027] Example 2

[0028] Coolant composition: 60% melamine, 10% nitroguanidine, 21% ammonium dihydrogen phosphate, 5% potassium fluoroaluminate and 4% ethyl cellulose.

[0029] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried melamine, nitroguanidine, ammonium dihydrogen phosphate, potassium fluoroaluminate and ethyl cellulose are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 16% of the total material mass of methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0030] Example 3

[0031] Coolant composition: 50% guanidine nitrate, 25% diammonium hydrogen phosphate, 20% potassium hydrogen tartrate and 5% phenolic resin.

[0032] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried guanidine nitrate, ammonium dihydrogen phosphate, potassium hydrogen tartrate and phenolic resin are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 12% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0033] Example 4

[0034] Coolant composition: 60% dicyandiamide, 25% calcium hydrogen phosphate, 7% potassium bromide and 8% epoxy resin.

[0035] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried dicyandiamide, calcium hydrogen phosphate, potassium bromide and epoxy resin are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 16% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0036] Example 5

[0037] Coolant composition: 50% azodicarbonamide, 10% nitroguanidine, 26% sodium dihydrogen phosphate, 10% potassium hydrogen phthalate and 4% shellac.

[0038] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried azodicarbonamide, nitroguanidine, sodium dihydrogen phosphate, potassium hydrogen phthalate and shellac are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 12% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0039] Example 6

[0040] Coolant composition: 50% methylguanamine, 25% potassium phosphate, 20% potassium hydrogen tartrate and 5% sorbitol.

[0041] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried methylguanamine, potassium phosphate, potassium hydrogen tartrate and sorbitol are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 15% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0042] Example 7

[0043] The coolant composition is: 30% guanidine acetic acid, 20% dicyandiamide, 24% dipotassium hydrogen phosphate, 20% potassium hydrogen tartrate and 6% glucose.

[0044] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried guanidine acetic acid, dicyandiamide, dipotassium hydrogen phosphate, potassium hydrogen tartrate and glucose are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 14% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0045] Example 8

[0046] Coolant composition: 20% dicyandiamide, 30% magnesium hydrogen phosphate, 10% calcium phosphate, 30% potassium phosphate, 2% potassium carbonate, and 8% dextrin.

[0047] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried dicyandiamide, magnesium hydrogen phosphate, calcium phosphate, potassium phosphate, potassium carbonate, and dextrin are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 13% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0048] Example 9

[0049] The coolant composition is: 20% azodicarbonamide, 20% carbodiimide, 20% guanidine acetic acid, 30% dipotassium hydrogen phosphate, 3% potassium fluoroaluminate and 7% phenolic resin.

[0050] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried azodicarbonamide, carbodiimide, guanidine acetic acid, dipotassium hydrogen phosphate, potassium fluoroaluminate and phenolic resin are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 12% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0051] Example 10

[0052] The coolant composition is: 25% guanidine acetic acid, 25% o-phenylenediamine, 20% calcium dihydrogen phosphate, 15% aluminum dihydrogen phosphate, 10% potassium gluconate and 5% dextrin.

[0053] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried guanidine acetic acid, o-phenylenediamine, calcium dihydrogen phosphate, aluminum dihydrogen phosphate, potassium gluconate and dextrin are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 13% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0054] Example 11

[0055] Coolant composition: 40% o-phenylenediamine, 15% cystine, 20% magnesium dihydrogen phosphate, 15% disodium hydrogen phosphate, 5% potassium citrate and 5% shellac.

[0056] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried o-phenylenediamine, cystine, magnesium dihydrogen phosphate, disodium hydrogen phosphate, shellac and potassium citrate are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 13% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0057] Example 12

[0058] Coolant composition: 25% acetazolamide, 25% methylguanamine, 20% manganese dihydrogen phosphate, 20% potassium phosphate, 4% sodium bicarbonate and 6% methylcellulose.

[0059] The above raw materials are crushed and passed through a 100-mesh sieve, and then dried. The dried acetazolamide, methylguanamine, manganese dihydrogen phosphate, potassium phosphate, sodium bicarbonate and methyl cellulose are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 14% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0060] Comparative Example 1

[0061] Coolant composition: 98% melamine, 2% ethyl cellulose.

[0062] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried melamine and ethyl cellulose are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 13% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is tested for 1m3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0063] Comparative Example 2

[0064] Coolant composition: 78% melamine, 20% potassium oxalate and 2% ethyl cellulose.

[0065] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried melamine, potassium oxalate and ethyl cellulose are respectively prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 15% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0066] Comparative Example 3

[0067] Coolant composition: 78% diammonium phosphate, 20% potassium oxalate and 2% ethyl cellulose.

[0068] The above raw materials are crushed and passed through an 80-mesh sieve, and then dried. The dried ammonium dihydrogen phosphate, potassium oxalate and ethyl cellulose are prepared in proportion and then mixed in corresponding proportions. After mixing evenly, 13% methanol is added thereto, and after mixing evenly again, the mixture is passed through a 20-mesh standard sieve for granulation to obtain a hot aerosol fire extinguishing agent coolant. The obtained coolant is dried at 80°C for 12 hours, and then sieved again through a 20-mesh sieve to obtain a dry coolant, and finally the coolant is pressed into tablets. 70g of coolant and 50g of K-type aerosol column are assembled into a small fire extinguishing device, and the device is subjected to 1m 3 Fire extinguishing performance test, while also measuring the temperature 0.5cm from the nozzle. Weigh the device before and after the test, and the discharge volume is calculated from the weight difference.

[0069] Comparative Example 4

[0070] Directly use Φ4 ceramic balls as physical coolant, and take 70g of ceramic balls and 50g of K-type aerosol column to assemble into a small fire extinguishing device. 3 Fire extinguishing performance test, while testing the temperature 0.5cm away from the nozzle of the device.

[0071] The characterization data and effect data of the products obtained in the above examples and comparative examples are shown in Table 1 below.

[0072] Table 1

[0073] The data in the table shows the spray rate, spray temperature, and fire extinguishing time of the coolants prepared in the examples and the comparative coolants. It can be seen that the spray rate of the coolant prepared by combining phosphate and organic flame retardants is higher than that of the coolant without phosphate, indicating effective reduction of residue. Furthermore, a comparison shows that the nozzle temperature of the device containing phosphate coolant is below 450°C, while the outlet temperature of the coolant without phosphate and ceramic balls exceeds 500°C. The temperature of the device using ceramic balls as coolant reached a maximum of 643°C, and fire extinguishing failed. This is primarily due to the ceramic balls' limited heat absorption capacity and inability to increase aerosol concentration. The device containing organic flame retardants and phosphate coolant extinguished the fire in less than 20 seconds, while the device without phosphate coolant extinguished the fire in 25 seconds. The device with ceramic balls failed to extinguish the fire. In Comparative Example 1, when the coolant was entirely inorganic flame retardant, not only was the nozzle temperature high, but fire extinguishing failed. Comparative Example 3, despite a low nozzle temperature, failed to extinguish the fire. Comparative Example 2 had a higher nozzle temperature and a longer fire extinguishing time. The addition of phosphate not only effectively reduces the outlet temperature but also improves the fire extinguishing ability.

[0074] 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 chemical coolant, characterized in that: The invention comprises the following components in percentage by mass: 20-70% of organic flame retardant, 20-70% of phosphate, 2-40% of additive and 2-10% of binder.

2. The chemical coolant according to claim 1, characterized in that: The organic flame retardant is one or more of melamine, nitroguanidine, guanidine nitrate, dicyandiamide, azodicarbonamide, sulfaguanidine, aminoguanidine, acetylguanidine, guanidine phosphate, guanidine chlorophenol, guanidine sulfate, methylguanamine, aminoguanidine sulfate, guanidineacetic acid, o-phenylenediamine, trimethylamine oxide, cystine, acetanilide, acetamide, sulfonamide and acetazolamide.

3. The flameless thermal aerosol fire extinguishing agent according to claim 1, characterized in that: The phosphate is one or more of ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium polyphosphate, calcium phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, sodium phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate dihydrate, potassium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, aluminum phosphate, aluminum dihydrogen phosphate, zinc dihydrogen phosphate, manganese dihydrogen phosphate, magnesium dihydrogen phosphate, and magnesium hydrogen phosphate.

4. The chemical coolant according to claim 1, characterized in that: The binder is one or more of hydroxypropyl methylcellulose, ethyl cellulose, methyl cellulose, hydroxyethyl methyl cellulose, phenolic resin, epoxy resin, shellac, starch, sorbitol, glucose, dextrin and rubber.

5. The chemical coolant according to any one of claims 1 to 4, characterized in that: 30-60% organic flame retardant, 20-50% phosphate, 2-8% binder and 5-40% additive.

6. The chemical coolant according to claim 5, characterized in that: The additive is one or more of potassium nitrate, potassium bicarbonate, potassium carbonate, potassium chloride, potassium bromide, potassium sulfate, potassium fluoroaluminate, potassium hydrogen phthalate, dipotassium phthalate, potassium hydrogen terephthalate, potassium salicylate, potassium hydrogen tartrate, potassium oxalate, potassium citrate, potassium gluconate, potassium stearate, and potassium sorbate.

7. The method for preparing the chemical coolant according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The raw materials are crushed and sieved, then dried, mixed according to proportion, and methanol is added to mix; The materials obtained in S2 and S1 are granulated through a screen and dried to obtain coolant granules; The coolant granules obtained in S3 and S2 are tableted by a tablet press to obtain columnar coolant granules.

8. The preparation method according to claim 7, characterized in that: When sieving after crushing, the screen is 80-100 mesh; when sieving after granulation, the screen is 10-20 mesh, the drying temperature is 60-80°C, and the drying time is 8-12h.

9. The preparation method according to claim 7, characterized in that: The amount of methanol added is 10-16% of the material mass.

10. Use of the chemical coolant according to any one of claims 1 to 6 in aerosol fire extinguishing.

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