Chemical coolant for aerosol fire extinguishing agent, and preparation method therefor and use thereof

Abstract

The present invention relates to the technical field of aerosol fire extinguishing agents. Specifically disclosed are a chemical coolant for an aerosol fire extinguishing agent, and a preparation method therefor and a use thereof. The coolant comprises the following components in percentage by weight: 80%-95% of an organic acid, 1%-10% of a lubricant, and 1%-10% of silicone oil. The preparation method specifically comprises: weighing the organic acid, the lubricant, and the silicon oil, uniformly mixing same in proportion, granulating by a screen, and pressing the obtained particles by means of a tablet press so as to obtain a chemical coolant tablet for an aerosol fire extinguishing agent. In the present invention, the organic acid is used as a main raw material, and the lubricant and a water repellent agent are added, so that it is convenient for preparation, molding and storage; during specific use, the surfaces of aerosol particles are coated with the organic acid, so that the hygroscopicity of the coolant and corrosion to metal are reduced.

Description

Chemical coolants for aerosol fire extinguishing agents, their preparation methods and applications Technical Field

[0001] This invention belongs to the field of aerosol fire extinguishing agent technology, and relates to a chemical coolant for aerosol fire extinguishing agents, its preparation method and application. Background Technology

[0002] Thermal aerosol fire extinguishing technology mainly includes aerosol fire extinguishing agents using potassium salts as oxidants and potassium-strontium salts as oxidants. The products released after the aerosol generator react mainly include CO2, N2, K2O, and K2CO3. K2O and K2CO3 are highly hygroscopic, and the hygroscopic KOH and K2CO3 will ionize to release OH- and CO32-. 2 -and K + Plasma exhibits strong conductivity and corrosiveness. The strong conductivity of thermal aerosol release products can cause secondary damage to energized equipment, and KOH and K₂CO₃ have a strong corrosive effect on metals. The corrosiveness and conductivity of aerosol fire extinguishing agent release products limit their application in precision instruments and energized environments, hindering their widespread use. Currently, there is no feasible and effective method to solve the corrosiveness and conductivity problems of aerosol fire extinguishing agent release products.

[0003] Due to the inherent physicochemical properties of aerosol fire extinguishing agents, they are corrosive and conductive. The only effective solution to these problems is to modify the released aerosol. Current methods for addressing the electrical insulation and conductivity of aerosol fallout primarily involve adding Sr salts to the aerosol generator. The product of the Sr salt reaction is SrO, which is non-hygroscopic, non-conductive, and non-corrosive. However, the addition of Sr significantly reduces the fire extinguishing capability of the aerosol. Currently used coolants primarily consider either cooling and flame suppression effects, or corrosion and electrical insulation. Existing S-type aerosol fire extinguishing agents have unsatisfactory corrosiveness and electrical insulation properties in their release products. The strong corrosiveness and conductivity of aerosol fire extinguishing agents limit their application in scenarios where corrosion and electrical insulation are critical.

[0004] CN116515465 A discloses a chemical coolant for aerosol fire extinguishing agents and its preparation method. The chemical coolant for aerosol fire extinguishing agents is prepared by combining organic acids, carbonates or basic carbonates, binders and release agents. It can reduce the nozzle temperature of fire extinguishing devices and achieve the effect of flame suppression, but it cannot solve the problems of corrosiveness and conductivity of the released products.

[0005] CN116943090 A discloses a chemical coolant and its application in K-type aerosol fire extinguishing agents. It is prepared by organic acid, inorganic acidic substances and binder, which can make the pH of the sediment solution close to neutral and solve the problems of corrosiveness and electrical insulation of aerosol release products. However, the coolant itself is easy to absorb moisture and cannot be stored for a long time in a high humidity environment.

[0006] Summary of the Invention

[0007] This invention provides a chemical coolant for aerosol fire extinguishing agents, its preparation method, and its application. It uses organic acid as the main raw material, and adds lubricant and hydrophobic agent to facilitate preparation, molding, and storage. In specific use, it coats the surface of aerosol particles to reduce their hygroscopicity and corrosiveness to metals.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a chemical coolant for aerosol fire extinguishing agents, containing the following components by weight: 80%-95% organic acid, 1%-10% lubricant and 1%-10% silicone oil.

[0009] Furthermore, the organic acid is one or more of cinnamic acid, benzoic acid, terephthalic acid, phthalic acid, citric acid, oxalic acid, tartaric acid, ethylenediaminetetraacetic acid, lauric acid, and salicylic acid.

[0010] Furthermore, the lubricant is one of magnesium stearate, calcium stearate, zinc stearate, boron nitride, graphite, and molybdenum disulfide.

[0011] Furthermore, the silicone oil is one or more of the following: methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, and methyl hydroxy silicone oil.

[0012] Furthermore, the organic acid is a solid particle at room temperature, which is the material that passes through a 20-mesh sieve.

[0013] Furthermore, the lubricant is a solid particle at room temperature, which is the material that passes through a 300-mesh sieve.

[0014] This invention also relates to a method for preparing the chemical coolant for the aerosol fire extinguishing agent, comprising the following steps:

[0015] Organic acid, lubricant and silicone oil are weighed, mixed evenly in proportion, granulated by sieve, and the resulting granules are pressed by a tablet press to obtain chemical coolant tablets for aerosol fire extinguishing agents.

[0016] Furthermore, the mixing time is 10–30 min.

[0017] Furthermore, a 20-mesh sieve is used during granulation.

[0018] This invention also relates to the application of the chemical coolant for the aerosol fire extinguishing agent in type K aerosol fire extinguishing agents.

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

[0020] This invention proposes a coolant using organic acid as the main raw material. The aerosol reacts with the organic acid at the nozzle of the device, forming a core-shell structure where the aerosol particles are coated with organic acid. The organic acid is highly hydrophobic, and the surface of the inorganic hydrophilic particles is coated with a hydrophobic organic layer, resulting in aerosol particles with very weak hygroscopicity. The strength of hygroscopicity is directly related to the corrosiveness and conductivity of the aerosol; weakly hygroscopic aerosol particles have difficulty absorbing moisture from the air, and the inorganic salts will not ionize. The aerosol particles coated in situ with organic acid exhibit very weak corrosiveness and conductivity, thus enabling the aerosol release to achieve a high insulation and low corrosion effect.

[0021] Specifically, the coolant of the present invention is composed of organic acid, lubricant and silicone oil. The organic acid forms a coating layer on the aerosol particles. The addition of lubricant is beneficial to the demolding process of tablet pressing. The production process does not require binders and solvents, making it simpler, safer and more environmentally friendly. The addition of silicone oil has a hydrophobic effect, reducing the hygroscopicity of the coolant. This makes the coolant less prone to moisture absorption, powdering failure or clogging of the fire extinguishing structure during storage, thus extending the service life of the coolant and promoting the moisture resistance of aerosol sediments. Attached Figure Description

[0022] Figure 1 shows the corrosion effect on copper sheets in Example 3 and Comparative Example 2. Detailed Implementation

[0023] To address the corrosiveness and conductivity of aerosol particles, surface coating can be applied to reduce their hygroscopicity and corrosiveness to metals. However, in practice, coating aerosol particles cannot be achieved by altering the aerosol formulation, as these particles are generated through high-temperature combustion. The generation and release of aerosols is a very short process; therefore, coating solid particles must be completed as soon as the aerosol smoke is generated, achieving in-situ modification of the aerosol particles. The chemical coolant provided by this invention contains a large amount of organic acid. High-temperature aerosol particles react with this organic acid, forming an in-situ core-shell structure of inorganic potassium salts coated with organic acid on the particle surface. The organic acid is hydrophobic, making the aerosol particles less prone to hygroscopicity. The non-hygroscopic aerosol particles do not ionize, thus preventing the sediment from becoming conductive and corroding metals. Coating aerosol particles with organic acid does not affect their fire extinguishing ability. In a fire, the surface coating layer easily undergoes oxidation, forming uncoated potassium salts, which remain in the same state as before coating. Very few aerosol particles participate in fire extinguishing; the vast majority of particles do not participate in fire extinguishing but settle directly. Therefore, the coated aerosol particles will not have their corrosiveness and electrical insulation properties affected after fire extinguishing.

[0024] This invention provides a chemical coolant for aerosol fire extinguishing agents, containing the following components by weight: 80%-95% organic acid, including but not limited to 80%, 85%, 87.5%, 91%, 93.7%, or 95%; 1%-10% lubricant, including but not limited to 1%, 3%, 5%, 7%, 8%, or 10%; and 1%-10% silicone oil, including but not limited to 1%, 2.5%, 4.9%, 7.2%, 8.8%, or 10%.

[0025] In a preferred embodiment, the organic acid is one or more selected from cinnamic acid, benzoic acid, terephthalic acid, phthalic acid, citric acid, oxalic acid, tartaric acid, ethylenediaminetetraacetic acid, lauric acid, and salicylic acid. More preferably, cinnamic acid, benzoic acid, and / or phthalic acid are used.

[0026] In a preferred embodiment, the lubricant is one of magnesium stearate, calcium stearate, zinc stearate, boron nitride, graphite, and molybdenum disulfide. More preferably, it is magnesium stearate, boron nitride, or graphite.

[0027] In a preferred embodiment, the silicone oil is one or more of methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, and methyl hydroxy silicone oil. More preferably, methyl silicone oil, ethyl silicone oil, and / or methyl hydrogen silicone oil are used.

[0028] Both the organic acid and the lubricant are solid at room temperature; the organic acid is a material that passes through a 20-mesh sieve, and the lubricant is a material that passes through a 300-mesh sieve.

[0029] This invention also relates to a method for preparing the chemical coolant for the aerosol fire extinguishing agent, comprising the following steps:

[0030] Organic acid, lubricant, and silicone oil are weighed and mixed evenly in a specified ratio. The mixture is then granulated using a sieve. The resulting granules are pressed using a tablet press to obtain chemical coolant tablets for aerosol fire extinguishing agents. The mixing time is preferably 10–30 min, more preferably 20 min. A 20-mesh sieve is used for granulation.

[0031] Adding hydrophobic substances to the coolant reduces its hygroscopicity, making it easier to store and preventing it from absorbing moisture and pulverizing during storage, thus maintaining its cooling effect. Furthermore, the coolant preparation process eliminates the need for solvent-based wet mixing and granulation; lubricants and hydrophobic agents are added directly to the raw materials, significantly simplifying the preparation process and improving production efficiency.

[0032] 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 for illustrating the present invention and should not be regarded as limiting the scope of the present invention.

[0033] Example 1

[0034] Aerosol coolant composition: 90% cinnamic acid, 5% magnesium stearate and 5% methyl silicone oil.

[0035] Weigh out cinnamic acid (through a 20-mesh sieve), magnesium stearate (through a 300-mesh sieve), and methyl silicone oil according to the specified proportions. Add the weighed raw materials to a mixer and mix for 20 minutes. Pass the mixed raw materials through a 20-mesh sieve. Finally, add the coolant granules to a tablet press and compress them to obtain coolant tablets with a diameter of 6 mm. Assemble 50 g of K-type aerosol-coated explosive charge and 70 g of the coolant tablets to form an aerosol fire extinguishing device. According to the XF 499.1-2010 standard model, at a depth of 1 m... 3 The electrical insulation, corrosiveness, and hygroscopicity of the sediment were tested within the space. The hygroscopicity of the coolant was tested under the same conditions as that of the sediment.

[0036] Example 2

[0037] Aerosol coolant composition: 93% benzoic acid, 2% zinc stearate and 5% ethyl silicone oil.

[0038] The preparation method and performance testing are the same as in Example 1.

[0039] Example 3

[0040] Aerosol coolant composition: 91% phthalic acid, 1% boron nitride and 8% phenyl silicone oil.

[0041] The preparation method and performance testing are the same as in Example 1.

[0042] Example 4

[0043] Aerosol coolant composition: 45% terephthalic acid, 50% citric acid, 2% graphite and 3% methyl hydrogen-containing silicone oil.

[0044] The preparation method and performance testing are the same as in Example 1.

[0045] Example 5

[0046] Aerosol coolant composition: 50% terephthalic acid, 37% citric acid, 5% molybdenum disulfide and 8% methylphenyl silicone oil.

[0047] The preparation method and performance testing are the same as in Example 1.

[0048] Example 6

[0049] Aerosol coolant composition: 85% tartaric acid, 7% calcium stearate and 8% methylchlorophenyl silicone oil.

[0050] The preparation method and performance testing are the same as in Example 1.

[0051] Example 7

[0052] Aerosol coolant composition: 95% salicylic acid, 2% magnesium stearate and 3% methyl vinyl silicone oil.

[0053] The preparation method and performance testing are the same as in Example 1.

[0054] Example 8

[0055] Aerosol coolant composition: 90% lauric acid, 5% graphite and 5% methyl hydroxy silicone oil.

[0056] The preparation method and performance testing are the same as in Example 1.

[0057] Comparative Example 1

[0058] Aerosol coolant composition: 95% salicylic acid and 5% magnesium stearate.

[0059] Weigh out salicylic acid (smaller than 20 mesh) and magnesium stearate (smaller than 300 mesh) according to the specified ratio. Add the weighed raw materials to a mixer and mix for 20 minutes. Pass the mixed raw materials through a 20-mesh sieve. Finally, add the coolant granules to a tablet press and compress them to obtain coolant tablets with a diameter of 6 mm. Assemble 50 g of aerosol-coated explosive charge and 70 g of the coolant tablets to form an aerosol fire extinguishing device. According to the XF 499.1-2010 standard model, at a depth of 1 m... 3 The electrical insulation, corrosiveness, and hygroscopicity of the sediment were tested within the space. The hygroscopicity of the coolant was tested under the same conditions as that of the sediment.

[0060] Comparative Example 2

[0061] Using Φ6 ceramic balls as the physical coolant, 70g of ceramic balls and 50g of K-type aerosol-coated explosive charge were assembled into a fire extinguishing device. Following the XF 499.1-2010 standard model, the device was installed at a depth of 1m. 3 The electrical insulation, corrosiveness, and hygroscopicity of the sediment were tested within the space. The hygroscopicity of the coolant was tested under the same conditions as that of the sediment.

[0062] The performance test data of the products in the above embodiments and comparative examples are shown in Table 1 below, and the corrosion effect of Example 3 and Comparative Example 2 on the copper sheet is shown in Figure 1.

[0063] Table 1

[0064] As can be seen from the table above, the aerosol release products of Comparative Example 2, using ceramic balls as a coolant, exhibited poor electrical insulation and severe corrosion. The sediment was highly hygroscopic, and upon absorbing moisture, it ionized, forming an alkaline environment that made the sediment conductive and highly corrosive. In contrast, the sediment produced by combining organic acid coolant with aerosol showed very weak corrosivity and excellent electrical insulation. As can be seen from Examples 7 and 1, the addition of silicone oil further reduced the hygroscopicity of the sediment and improved its electrical insulation. Silicone oil and organic acid had a synergistic effect on improving the electrical insulation of the sediment. The corrosivity and electrical insulation of the sediment were directly related to its hygroscopicity. The sediment using organic acid as a coolant had extremely low hygroscopicity, thus preventing ionization. Furthermore, the addition of silicone oil reduced the hygroscopicity of the coolant, making it less prone to moisture absorption and pulverization during storage, thereby increasing its service life.

[0065] The above embodiments describe preferred embodiments of the present invention, but the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other way. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A chemical coolant for aerosol fire extinguishing agents, characterized in that, It contains the following components by weight: 80%-95% organic acids, 1%-10% lubricant and 1%-10% silicone oil.

2. The chemical coolant for aerosol fire extinguishing agents according to claim 1, characterized in that: The organic acid is one or more of the following: cinnamic acid, benzoic acid, terephthalic acid, phthalic acid, citric acid, oxalic acid, tartaric acid, ethylenediaminetetraacetic acid, lauric acid, and salicylic acid.

3. The chemical coolant for aerosol fire extinguishing agents according to claim 1, characterized in that: The lubricant is one of magnesium stearate, calcium stearate, zinc stearate, boron nitride, graphite, and molybdenum disulfide.

4. The chemical coolant for aerosol fire extinguishing agents according to claim 1, characterized in that: The silicone oil is one or more of the following: methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, and methyl hydroxy silicone oil.

5. The chemical coolant for aerosol fire extinguishing agents according to any one of claims 1 to 4, characterized in that: Organic acids are solid particles at room temperature; they pass through a 20-mesh sieve.

6. The chemical coolant for aerosol fire extinguishing agents according to any one of claims 1 to 4, characterized in that: The lubricant is a solid particle at room temperature; it is the material that passes through a 300-mesh sieve.

7. A method for preparing the chemical coolant for aerosol fire extinguishing agents according to any one of claims 1 to 6, characterized in that, Includes the following steps: Organic acid, lubricant and silicone oil are weighed, mixed evenly in proportion, granulated by sieve, and the resulting granules are pressed by a tablet press to obtain chemical coolant tablets for aerosol fire extinguishing agents.

8. The preparation method according to claim 7, characterized in that: Mixing time is 10–30 min.

9. The preparation method according to claim 7, characterized in that: A 20-mesh sieve is used for granulation.

10. The application of the chemical coolant for aerosol fire extinguishing agents according to any one of claims 1 to 6 in type K aerosol fire extinguishing agents.

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