Water-based cold-resistant flame-retardant fire extinguishing agent and preparation method thereof

Abstract

The invention discloses a water-based cold-resistant flame-retardant fire extinguishing agent and a preparation method thereof. The fire extinguishing agent comprises the following raw materials in parts by weight: 20-30 parts of an anti-freezing agent, 50-60 parts of deionized water, 10-20 parts of a flame retardant, 0.2-0.8 part of a corrosion inhibitor, 0.25-0.55 part of a penetrant, 6-10 parts of a surfactant and a plurality of parts of a pH regulator. The pH value of the water-based cold-resistant flame-retardant fire extinguishing agent is 7-8, and the freezing point is less than or equal The fire extinguishing agent has excellent anti-freezing performance, can ensure that the fire extinguishing agent is not solidified in a cold environment, can be suitable for a low-temperature environment, and can normally flow in a cold region and in winter to ensure the fire extinguishing performance; and the corrosion inhibitor is also added, so that the corrosion to metal can be effectively prevented, the storage tank can be prevented from being corroded, and the service life of the fire extinguishing agent is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fire extinguishing agents, and in particular to a water-based cold-resistant flame-retardant fire extinguishing agent and a preparation method thereof. Background Art

[0002] When a fire accident occurs, it will cause huge economic losses and casualties, so the fire extinguishing agent that plays a role in extinguishing fires is crucial. At present, common fire extinguishing agents include foam fire extinguishing agents, dry powder fire extinguishing agents, carbon dioxide fire extinguishing agents, water-type fire extinguishing agents, and halogenated hydrocarbon fire extinguishing agents. As the most widely used fire extinguishing agent, water has great advantages. It has strong heat absorption capacity, good fire extinguishing effect, low price, and easy to obtain. In the fire scene, water will absorb a lot of heat in the process of evaporating to generate a large amount of water vapor. However, using water as a fire extinguishing agent also has shortcomings. For example, in the cold areas and plateau areas in northern my country, severe cold weather will cause the liquid fire extinguishing agent in the fire extinguishing device to solidify, reducing the fire extinguishing efficiency of the fire extinguishing agent. In response to the above problems, antifreeze can be added to the original water-type fire extinguishing agent so that the fire extinguishing agent can be used normally in cold areas and improve the fire safety level. However, in actual use, attention should also be paid to improving its anti-corrosion and anti-corruption properties to meet the requirements of practical applications.

[0003] In the prior art, the invention patent with publication number CN115738159A discloses a water-based fire extinguishing agent and a preparation method thereof, which is green and environmentally friendly, has a low freezing point and high fire extinguishing efficiency, but does not consider the effect of the fire extinguishing agent on the corrosion of metal containers. The invention patent with publication number CN114796964A provides an environmentally friendly water-based fire extinguishing agent and a preparation method thereof, which is environmentally friendly and non-toxic, and easy to clean up after extinguishing a fire, but the fire extinguishing agent uses a single flame retardant and has limited fire extinguishing performance.

[0004] Based on this, there is an urgent need to develop a water-based fire extinguishing agent that is antifreeze, corrosion-resistant, and has good fire extinguishing performance. Summary of the invention

[0005] The purpose of the present invention is to provide a water-based cold-resistant flame-retardant fire extinguishing agent and a preparation method thereof, to solve the following technical problems:

[0006] How to improve the antifreeze, corrosion resistance and fire extinguishing performance of water-based fire extinguishing agents.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] In a first aspect, the present invention discloses a water-based cold-resistant flame-retardant fire extinguishing agent, comprising the following raw materials in parts by weight: 20-30 parts of antifreeze agent, 50-60 parts of deionized water, 10-20 parts of flame retardant, 0.2-0.8 parts of corrosion inhibitor, 0.25-0.55 parts of penetrant, 6-10 parts of surfactant, and several parts of pH regulator;

[0009] The pH value of the water-based cold-resistant flame-retardant fire extinguishing agent is 7-8, and the freezing point is ≤-20°C.

[0010] Furthermore, the antifreeze agent is ethylene glycol or glycerol.

[0011] Furthermore, the flame retardant is one or a combination of any multiple of magnesium hypophosphite, ammonium polyphosphate, ammonium dihydrogen phosphate, ammonium chloride, potassium bicarbonate, and sodium bicarbonate.

[0012] Furthermore, the corrosion inhibitor is one or a combination of any multiple of sodium benzoate, phenol, benzotriazole, triethanolamine, borate, phosphate, metasilicate, and urea.

[0013] Furthermore, the penetrant is one of urea, fatty alcohol polyoxyethylene ether, sodium dodecyl sulfate, or a combination of any multiple thereof.

[0014] Furthermore, the pH regulator is one or a combination of sodium hydroxide or citric acid.

[0015] In a second aspect, the present invention also discloses a method for preparing the water-based cold-resistant flame-retardant fire extinguishing agent as described above, comprising the following steps: adding antifreeze agent, corrosion inhibitor, flame retardant and penetrant to deionized water in sequence and mixing and stirring evenly, heating and maintaining the temperature at 45°C±2°C to make the solution clear and transparent, and finally adding a pH regulator to adjust the overall pH value of the solution to 7-8, and continuing to stir until the solution is clear and transparent, thereby obtaining the water-based cold-resistant flame-retardant fire extinguishing agent.

[0016] Beneficial effects of the present invention:

[0017] 1. Compared with the traditional water-based fire extinguishing agent, the fire extinguishing agent of the present invention has excellent antifreeze performance, which can ensure that the fire extinguishing agent does not solidify in a cold environment, can be used in a low-temperature environment, and can flow normally in cold areas and in winter to ensure fire extinguishing performance;

[0018] 2. Traditional antifreeze does not have a fire extinguishing function. Using it to extinguish a fire may even aggravate the development of the fire. Compared with traditional antifreeze, the fire extinguishing agent of the present invention has excellent fire extinguishing performance while taking into account the excellent antifreeze performance of antifreeze;

[0019] 3. The fire extinguishing agent of the present invention is added with a corrosion inhibitor, which can effectively prevent corrosion to metals and storage tanks, thereby extending the service life of the fire extinguishing agent. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The experimental methods in the following examples, unless otherwise specified, are all conventional methods, and are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. The materials, reagents, etc. used in the following examples, unless otherwise specified, can all be obtained from commercial channels.

[0022] Example 1

[0023] In 50g of deionized water, add 50g of ethylene glycol, 4g of magnesium hypophosphite, 4g of ammonium dihydrogen phosphate, 4g of ammonium chloride, 0.5g of benzotriazole, and 0.25g of urea in sequence, mix and stir at a rate of 500r / min for 30min, and heat to keep the temperature at 45℃±2℃ to fully dissolve the components. After the solution becomes clear and transparent, add sodium hydroxide to adjust the pH of the solution to between 7-8, and obtain a water-based cold-resistant flame retardant fire extinguishing agent.

[0024] Example 2

[0025] In 60g of deionized water, add 40g of ethylene glycol, 6g of magnesium hypophosphite, 4g of ammonium dihydrogen phosphate, 4g of ammonium chloride, 0.35g of benzotriazole and 0.35g of urea in sequence, mix and stir at a rate of 500r / min for 30min, and heat to keep the temperature at 45℃±2℃ to fully dissolve the components. After the solution becomes clear and transparent, add sodium hydroxide to adjust the pH of the solution to between 7 and 8 to obtain a water-based cold-resistant flame retardant fire extinguishing agent.

[0026] Example 3

[0027] In 70g of deionized water, 30g of ethylene glycol, 10g of magnesium hypophosphite, 6g of ammonium dihydrogen phosphate, 4g of ammonium chloride, 0.45g of benzotriazole and 0.45g of urea were added in sequence, and the mixture was stirred at a rate of 500r / min for 30min. At the same time, the mixture was heated to maintain the temperature at 45°C±2°C to fully dissolve the components. After the solution became clear and transparent, sodium hydroxide was added to adjust the pH of the solution to between 7 and 8 to obtain a water-based cold-resistant flame-retardant fire extinguishing agent.

[0028] Example 4

[0029] In 70g of deionized water, 30g of ethylene glycol, 10g of magnesium hypophosphite, 4g of ammonium dihydrogen phosphate, 6g of ammonium chloride, 0.55g of benzotriazole and 0.55g of urea were added in sequence, and the mixture was stirred at a rate of 500r / min for 30min. At the same time, the mixture was heated to maintain the temperature at 45°C±2°C to fully dissolve the components. After the solution became clear and transparent, sodium hydroxide was added to adjust the pH of the solution to between 7 and 8 to obtain a water-based cold-resistant flame-retardant fire extinguishing agent.

[0030] Example 5

[0031] In 50g of deionized water, add 50g of ethylene glycol, 4g of magnesium hypophosphite, 6g of ammonium dihydrogen phosphate, 6g of ammonium chloride, 0.45g of benzotriazole, and 0.35g of urea in sequence, mix and stir at a rate of 500r / min for 30min, and heat to keep the temperature at 45℃±2℃ to fully dissolve the components. After the solution becomes clear and transparent, add sodium hydroxide to adjust the pH of the solution to between 7-8, and obtain a water-based cold-resistant flame retardant fire extinguishing agent.

[0032] Comparative Example 1

[0033] Compared with Example 1, the only difference is that ammonium dihydrogen phosphate and ammonium chloride are not added, and other conditions are exactly the same, and finally a water-based cold-resistant flame-retardant fire extinguishing agent is obtained.

[0034] Comparative Example 2

[0035] Compared with Example 2, the only difference is that ammonium chloride is not added, and other conditions are exactly the same, and finally a water-based cold-resistant flame-retardant fire extinguishing agent is obtained.

[0036] Comparative Example 3

[0037] Compared with Example 3, the only difference is that no diammonium phosphate is added, and other conditions are exactly the same, and finally a water-based cold-resistant flame-retardant fire extinguishing agent is obtained.

[0038] Comparative Example 4

[0039] Compared with Example 4, the only difference is that ethylene glycol is not added, and other conditions are exactly the same, and finally a water-based cold-resistant flame-retardant fire extinguishing agent is obtained.

[0040] Comparative Example 5

[0041] Compared with Example 5, the only difference is that the amount of ethylene glycol added is 20 g, and other conditions are exactly the same, and finally a water-based cold-resistant flame-retardant fire extinguishing agent is obtained.

[0042] The water-based cold-resistant flame-retardant fire extinguishing agents prepared in Examples 1-5 and Comparative Examples 1-5 were tested for antifreeze and fire extinguishing performances, and the test standard was GB / T 17835-2008 "Water-based Fire Extinguishing Agents". The test results are listed in Table 1, which is as follows:

[0043] Table 1

[0044] Inspection items Freezing point / ℃ pH Fire extinguishing time / s Example 1 -43.2 7.0 11.0 Example 2 -35.6 7.3 10.5 Example 3 -26.8 7.8 10.3 Example 4 -27.3 7.5 10.8 Example 5 -45.3 7.6 9.9 Comparative Example 1 -42.3 7.0 13.2 Comparative Example 2 -35.0 7.2 11.5 Comparative Example 3 -28.3 7.8 11.3 Comparative Example 4 0 7.2 11.0 Comparative Example 5 -12.3 7.1 10.5

[0045] By analyzing the test results in Table 1, it can be seen that the water-based cold-resistant flame retardant fire extinguishing agent prepared in Examples 1-5 has a slightly faster fire extinguishing time than the water-based cold-resistant flame retardant fire extinguishing agent prepared in Comparative Examples 1-5, but the difference is not large, the freezing point is lower, the antifreeze performance is excellent, and it can be used in low temperature environments. Therefore, the water-based cold-resistant flame retardant fire extinguishing agent of the present invention has excellent antifreeze and fire extinguishing performance.

[0046] The corrosion resistance and stability performance tests were performed on the water-based cold-resistant flame retardant fire extinguishing agents obtained in Examples 1-5 and Comparative Examples 1-5. The test methods and results are as follows:

[0047] Corrosion resistance: 6 groups of identical cast iron and carbon steel test pieces were placed in the water-based cold-resistant flame-retardant fire extinguishing agent prepared in Examples 1-5 of the present invention and in tap water as a control group, respectively, and placed in an environment of 55°C±2°C for 48 hours before being taken out and the surfaces of the test pieces were observed. The results showed that the surfaces of the cast iron and carbon steel placed in the water-based cold-resistant flame-retardant fire extinguishing agent in Examples 1-5 were smooth and free of rust, while the surfaces of the test pieces placed in the tap water as the control group were rusted, which indicates that the fire extinguishing agent of the present invention has good corrosion resistance for metals.

[0048] Stability: The water-based cold-resistant flame-retardant fire extinguishing agents prepared in Examples 1-5 were placed at low temperature for 48 hours to observe whether the fire extinguishing agents showed precipitation or stratification. The test results showed that the water-based cold-resistant flame-retardant fire extinguishing agents prepared in Examples 1-5 did not show precipitation or stratification within their respective freezing point ranges, which indicates that the water-based cold-resistant flame-retardant fire extinguishing agents of the present invention have good low-temperature stability and can be used in low-temperature environments.

[0049] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A water-based cold-resistant flame-retardant fire extinguishing agent, characterized in that: The raw materials include the following parts by weight: 20-30 parts of antifreeze agent, 50-60 parts of deionized water, 10-20 parts of flame retardant, 0.2-0.8 parts of corrosion inhibitor, 0.25-0.55 parts of penetrant, 6-10 parts of surfactant, and several parts of pH regulator; The pH value of the water-based cold-resistant flame-retardant fire extinguishing agent is 7-8, and the freezing point is ≤-20°C.

2. The water-based cold-resistant flame-retardant fire extinguishing agent according to claim 1, characterized in that: The antifreeze agent is ethylene glycol or glycerol.

3. The water-based cold-resistant flame-retardant fire extinguishing agent according to claim 1, characterized in that: The flame retardant is one of magnesium hypophosphite, ammonium polyphosphate, ammonium dihydrogen phosphate, ammonium chloride, potassium bicarbonate, sodium bicarbonate, or a combination of any multiple thereof.

4. The water-based cold-resistant flame-retardant fire extinguishing agent according to claim 1, characterized in that: The corrosion inhibitor is one of sodium benzoate, phenol, benzotriazole, triethanolamine, borate, phosphate, metasilicate and urea, or a combination of any multiple thereof.

5. The water-based cold-resistant flame-retardant fire extinguishing agent according to claim 1, characterized in that: The penetrant is one of urea, fatty alcohol polyoxyethylene ether, sodium dodecyl sulfate, or any combination of multiple thereof.

6. The water-based cold-resistant flame-retardant fire extinguishing agent according to claim 1, characterized in that: The pH regulator is one of sodium hydroxide or citric acid or a combination of both.

7. A method for preparing the water-based cold-resistant flame-retardant fire extinguishing agent according to any one of claims 1 to 6, characterized in that: The following steps are involved: In deionized water, add antifreeze agent, corrosion inhibitor, flame retardant and penetrant in turn and mix well. Heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent. Finally, add pH adjuster to adjust the overall pH value of the solution to 7-8. Continue stirring until the solution is clear and transparent to obtain a water-based cold-resistant flame retardant fire extinguishing agent.