WO2022166043A1

WO2022166043A1 - Sodium hydrosulfite firefighting liquid fire-extinguishing agent and corresponding slow-release sodium hydrosulfite

Info

Publication number: WO2022166043A1
Application number: PCT/CN2021/096778
Authority: WO
Inventors: 车文成; 陈少峰
Original assignee: 茂名职业技术学院
Priority date: 2021-02-05
Filing date: 2021-05-28
Publication date: 2022-08-11
Also published as: CN112957649B; CN112957649A

Abstract

A sodium hydrosulfite firefighting liquid fire-extinguishing agent and a corresponding slow-release sodium hydrosulfite. The sodium hydrosulfite firefighting liquid fire-extinguishing agent and the slow-release sodium hydrosulfite both contain the following compositions: diammonium hydrogen phosphate, sodium silicate and ethylene glycol. The water-based fire-extinguishing agent is prepared by compounding the aforementioned compositions, and the temperature of the sodium hydrosulfite is rapidly decreased by utilizing the fact that the fire-extinguishing agent flows and permeates into the sodium hydrosulfite, so that the reaction intensity is reduced, and the cooling and fire-extinguishing effects on the sodium hydrosulfite are achieved; and the slow-release sodium hydrosulfite is prepared by compounding the aforementioned compositions in the sodium hydrosulfite, and the reaction between the slow-release sodium hydrosulfite and water is relatively slow, which can effectively prevent the problems of fire accidents and environmental pollution caused by the reaction between sodium hydrosulfite and water in transportation and storage environments, and has high transportation and storage safety.

Description

A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent and corresponding slow-release hydrosulfite

technical field

The invention belongs to the field of hydrosulfite and hydrosulfite fire fighting, and relates to a hydrosulfite fire fighting liquid fire extinguishing agent and a corresponding slow-release hydrosulfite.

Background technique

Sodium hydrosulfite, scientific name sodium hydrosulfite, is an inorganic substance with the chemical formula Na ₂ S ₂ O ₄ . It is a white sand-like crystal or light yellow powder chemical product with a melting point of 300°C (decomposition) and an ignition temperature of 250°C. Insoluble in ethanol, soluble in sodium hydroxide solution, reacts strongly with water and burns.

According to the national standard GB6844-86 "Classification and Product Name Number of Dangerous Goods", sodium dithionite belongs to the first-class flammable article when it encounters moisture. After encountering water, a chemical reaction occurs, and the reaction is violent, producing combustible gas hydrogen sulfide and sulfur dioxide, and releasing a lot of heat. The reaction equation is: 2Na ₂ S ₂ O ₄ +2H ₂ O+O ₂ =4NaHSO ₃ , and the product is further reacted to generate hydrogen sulfide and sulfur dioxide.

In China, there are fire accidents with hydrosulfite powder every year. Most of the conventional fire extinguishing methods use water spray or CO ₂ to put out the fire, but the hydrosulfite powder catches fire and cannot be put out with water. This is the consensus of the industry and fire officers and soldiers. For powder fires, the industry has not yet had effective fire fighting techniques and methods. How to quickly put out the fires of hydrosulfite and sodium metabisulfite is a worldwide problem.

Therefore, the development of a relatively stable slow-release hydrosulfite and a fire extinguishing agent for existing hydrosulfite fires is of great significance for the safe storage of hydrosulfites and the rapid fire fighting of hydrosulfites.

SUMMARY OF THE INVENTION

Aiming at the lack of fire extinguishing agent for effectively fighting hydrosulfite fires in the prior art and the problem that the existing hydrosulfites are flammable when wet, one of the objects of the present invention is to provide a liquid fire extinguishing agent for hydrosulfite fire fighting, and based on its The principle of insurance powder rescue is to provide a sustained-release type of insurance powder with good stability, which can be transported and stored safely, as another object of the present invention.

Based on the above object, the technical scheme adopted in the present invention is as follows:

In a first aspect, the present invention provides a composition for hydrosulfite fire fighting liquid fire extinguishing agent or slow-release hydrosulfite, the composition comprising diammonium hydrogen phosphate, sodium silicate and ethylene glycol.

Further, the above-mentioned composition for hydrosulfite fire fighting liquid fire extinguishing agent or slow-release hydrosulfite, the composition comprises 0.5-10 mass parts of diammonium hydrogen phosphate, 0.5-10 mass parts of sodium silicate and 4-10 mass parts of sodium silicate. 50 parts by mass of ethylene glycol.

The inventor's research team found that the mixture of diammonium hydrogen phosphate, sodium silicate, ethylene glycol, etc. can well inhibit the reaction between hydrosulfite and water, and the diammonium hydrogen phosphate, sodium silicate, ethylene glycol, etc. No flash point and calorific value were detected in the water-based mixture, therefore, the above composition can be used to prepare a hydrosulfite fire extinguishing liquid fire extinguishing agent; Transportation and storage stability of hydrosulfites.

In the second aspect, the present invention provides a hydrosulfite fire extinguishing liquid fire extinguishing agent, the fire extinguishing agent comprises 0.5-10 mass parts of diammonium hydrogen phosphate, 0.5-10 mass parts of sodium silicate and 4-50 mass parts of ethylene dichloride alcohol.

Diammonium hydrogen phosphate has the function of free radical reaction terminator, terminates the oxidation reaction of the fire, inhibits and terminates the reaction, and achieves the fire extinguishing effect.

Sodium silicate plays the role of stabilizing pH value in the fire extinguishing agent. It forms a protective film on the surface of the hydrosulfite, which blocks the contact between the hydrosulfite and water to a certain extent, thereby inhibiting the reaction between the hydrosulfite and water.

Ethylene glycol and water form a mixture, which inhibits the ionization of water to a certain extent and reduces the concentration of hydrogen ions in the water, thereby reducing the activity of water, thereby inhibiting the reaction between water and hydrosulfite.

Based on the previous research results, the invention uses the liquid material to flow and penetrate into the igniting object by compounding a large amount of low-flammable value liquid material to rapidly reduce the temperature of the igniting object, thereby reducing the intensity of the reaction and cooling and extinguishing the fire.

Further, the above-mentioned fire extinguishing agent also includes 0.5-10 parts by mass of disodium hydrogen phosphate or dipotassium hydrogen phosphate or ammonium dihydrogen phosphate.

Phosphates such as disodium hydrogen phosphate, dipotassium hydrogen phosphate, and diammonium hydrogen phosphate have the effect of free radical reaction terminators. The use of phosphates can quickly terminate the oxidation reaction of ignitable substances, inhibit and terminate the reaction, and achieve the effect of fire extinguishing.

Further, the above-mentioned fire extinguishing agent also includes 0.2-2 parts by mass of alkyl polyoxyethylene ether.

The addition of alkyl polyoxyethylene ether improves the wettability and permeability of the fire extinguishing agent, so that the fire extinguishing agent can quickly penetrate into the inside of the fire, accelerate the cooling and termination reaction speed of the fire extinguishing agent, and thus improve the fire extinguishing speed.

Further, the above-mentioned fire extinguishing agent also includes 40-88.5 parts by mass of water.

Further, the above-mentioned fire extinguishing agent includes 1-2 parts by mass of ammonium dihydrogen phosphate, 5-8 parts by mass of diammonium hydrogen phosphate, 1-5 parts by mass of sodium silicate, 44-45 parts by mass of ethylene glycol and 43 parts by mass of ethylene glycol. ~45 parts by mass of water.

In a third aspect, the present invention provides a sustained-release hydrosulfite comprising 0.5-10 parts by mass of diammonium hydrogen phosphate, 0.5-10 parts by mass of sodium silicate and 4-50 parts by mass of ethyl acetate diols.

Further, the above-mentioned sustained-release hydrosulfite also includes 0.2-10 parts by mass of ammonium dihydrogen phosphate.

Further, the above-mentioned sustained-release hydrosulfite includes 0.2-0.5 parts by mass of ammonium dihydrogen phosphate, 2-4 parts by mass of diammonium hydrogen phosphate, 0.5-1.2 parts by mass of sodium silicate, and 4-6 parts by mass of ethylene dihydrogen phosphate alcohol.

Based on the previous research results of the inventor's team, after mixing low calorific value diammonium hydrogen phosphate, sodium silicate and ethylene glycol with hydrosulfite, a hydrosulfite with sustained-release performance was prepared, which greatly reduced the slow-release performance. The reaction speed and reaction intensity of hydrosulfite and water have good transportation and storage stability.

Compared with the prior art, the beneficial effects of the present invention are as follows:

(1) In the present invention, a water-based fire extinguishing agent is prepared by compounding diammonium hydrogen phosphate, sodium silicate and ethylene glycol, and the fire extinguishing agent is used to flow and penetrate into the inside of the hydrosulfite to rapidly reduce the temperature of the hydrosulfite, thereby reducing the severity of the reaction , play the role of cooling and extinguishing the insurance powder.

(2) The present invention obtains slow-release hydrosulfite by compounding diammonium hydrogen phosphate, sodium silicate and ethylene glycol in industrial hydrosulfite. The slow-release hydrosulfite reacts relatively slowly with water, which can effectively prevent Fire accidents and environmental pollution problems caused by the reaction of hydrosulfite and water in the transportation and storage environment have high transportation and storage safety.

Detailed ways

In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The test methods used in the examples are conventional methods unless otherwise specified; the materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.

Embodiment 1 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

The present embodiment provides a kind of hydrosulfite fire extinguishing liquid fire extinguishing agent, and its formula is as follows:

0.5 parts by mass of disodium hydrogen phosphate, 0.5 parts by mass of diammonium hydrogen phosphate, 0.5 parts by mass of sodium silicate, 10 parts by mass of ethylene glycol, and 88.5 parts by mass of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 1, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

Taking 100Kg of hydrosulfite as the fire extinguishing test object, the fire extinguishing dose used is 100Kg.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 18875ppm.

The above-mentioned 100kg fire extinguishing agent was sprayed above the sodium hydrosulfite within ₁₀ seconds, and 10 seconds after the spraying was completed, it was observed that the amount of gas escaping from the mouth of the iron drum was significantly reduced; 25538ppm, the temperature of the mixture in the measurement barrel rose 27.3°C after 5min.

Embodiment 2 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

0.5 mass part of disodium hydrogen phosphate, 0.5 mass part of diammonium hydrogen phosphate, 0.5 mass part of sodium silicate, 50 mass parts of ethylene glycol, and 48.5 mass parts of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 2, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 19465ppm.

The above-mentioned 100kg fire extinguishing agent was sprayed above the sodium hydrosulfite within ₁₀ seconds, and 10 seconds after the spraying was completed, it was observed that the amount of gas escaping from the mouth of the iron drum was significantly reduced; 5876ppm, the temperature of the mixture in the measurement barrel rose 8.9°C after 5min.

Compared with the fire-extinguishing effect of the fire-extinguishing agent in Example 1 on hydrosulfite, after spraying the fire-extinguishing agent in Example 2 for ₂ minutes, it was detected that the SO concentration was 3.35 times lower than that of Example 1 above the mouth of the iron barrel, and the temperature of the mixture in the barrel was 3.35 times lower. The rise is smaller than that of Example 1. It is shown that the reaction intensity of the fire extinguishing agent and the hydrosulfite in Example 2 is far less than that in Example 1, and it is also shown that the fire extinguishing effect of the fire extinguishing agent in Example 2 on the hydrosulfite is better than that in Example 1.

Embodiment 3 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

2 parts by mass of disodium hydrogen phosphate, 5 parts by mass of diammonium hydrogen phosphate, 1 part by mass of sodium silicate, 46.5 parts by mass of ethylene glycol, and 45.5 parts by mass of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 3, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 17685ppm.

The above-mentioned 100kg fire extinguishing agent was sprayed above the sodium hydrosulfite within ₁₀ seconds, and 10 seconds after the spraying was completed, it was observed that the amount of gas escaping from the mouth of the iron drum was significantly reduced; 1937ppm, the temperature of the mixture in the measuring barrel rose 2.7°C after 5min.

Compared with the fire-extinguishing effect of the fire-extinguishing agent of Example 2 on hydrosulfite, after spraying the fire-extinguishing agent of Example 3 for 2 minutes, it was detected that the SO concentration was 2.03 times lower than that of Example ₂ above the mouth of the iron barrel, and the temperature of the mixture in the barrel was 2.03 times lower than that of Example 2. The rise is smaller than that of Example 2. It is shown that the reaction intensity of the fire extinguishing agent and the hydrosulfite in Example 3 is far less than that in Example 2, and it is also shown that the fire extinguishing effect of the fire extinguishing agent in Example 3 on the hydrosulfite is better than that in Example 2.

Embodiment 4 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

2 parts by mass of disodium hydrogen phosphate, 7 parts by mass of diammonium hydrogen phosphate, 3 parts by mass of sodium silicate, 45 parts by mass of ethylene glycol, and 43 parts by mass of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 4, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 17983ppm.

The above-mentioned 100kg fire extinguishing agent was sprayed above the sodium hydrosulfite within ₁₀ seconds, and 10 seconds after the spraying was completed, it was observed that the amount of gas escaping from the mouth of the iron drum was significantly reduced; 567ppm, and the temperature of the mixture in the measurement barrel rose 1.1°C after 5 minutes.

Compared with the fire-extinguishing effect of the fire-extinguishing agent in Example 3 on hydrosulfite, after spraying the fire-extinguishing agent in Example 4 for ₂ minutes, it was detected that the SO concentration was 2.42 times lower than that of Example 3 above the mouth of the iron barrel, and the temperature of the mixture in the barrel was 2.42 times lower. The rise is smaller than that of Example 3. It is shown that the reaction severity of the fire extinguishing agent and the hydrosulfite in Example 4 is far less than that in Example 3, and it is also shown that the fire extinguishing effect of the fire extinguishing agent in Example 4 on the hydrosulfite is better than that in Example 3.

Embodiment 5 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

1 mass part of ammonium dihydrogen phosphate, 5 mass parts of diammonium hydrogen phosphate, 5 mass parts of sodium silicate, 45 mass parts of ethylene glycol, and 43 mass parts of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 5, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 18587ppm.

The above-mentioned 100kg fire extinguishing agent was sprayed above the sodium hydrosulfite within ₁₀ seconds, and 10 seconds after the spraying was completed, it was observed that the amount of gas escaping from the mouth of the iron drum was significantly reduced; 289ppm, the temperature of the mixture in the measuring barrel rose 0.6°C after 5min.

Compared with the fire-extinguishing effect of the fire-extinguishing agent in Example 4 on hydrosulfite, after spraying the fire-extinguishing agent in Example 5 for 2 min, it was detected that the concentration of SO ₂ was 96.2% lower than that of Example 1 above the mouth of the iron barrel, and the temperature of the mixture in the barrel was reduced by 96.2%. The rise is smaller than that of Example 4. It is shown that the reaction intensity of the fire extinguishing agent and the hydrosulfite in Example 5 is far less than that in Example 4, and it is also shown that the fire extinguishing effect of the fire extinguishing agent in Example 5 on the hydrosulfite is better than that in Example 4.

Comparative Example 1

In this comparative example, the above-mentioned fire extinguishing agent was replaced with the same amount of water, and the combustion of hydrosulfite and water was tested. The specific test methods are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

Take 100Kg of hydrosulfite as the test object, and replace the above fire extinguishing agent with 100Kg of water.

The specific test process is as follows:

Pour 100kg of insurance powder into the above-mentioned iron bucket, and after laying it flat, use a sulfur dioxide detector to detect the sulfur dioxide concentration at the mouth of the iron bucket. At this time, the SO ₂ concentration is 19377ppm.

The above-mentioned 100kg of water was sprayed above the hydrosulfite within 10 seconds, and 10 seconds after the spraying ended, it was observed that the amount of gas escaping from the mouth of the iron barrel increased significantly; after _2min , the SO concentration was detected above the mouth of the iron barrel as 93560ppm, the temperature of the mixture in the measurement barrel rose 92.3°C after 5min.

Table 1 shows the SO ₂ concentrations and temperature changes generated by the combustion of hydrosulfite in Examples 1 to 5 and Comparative Example 1.

Table 1 Fire-extinguishing performance indexes of different formulas of hydrosulfite fire-fighting liquid fire extinguishing agents

As can be seen from Table 1, compared with Comparative Example 1, after spraying the fire extinguishing agents of Examples 1 to 5 to the hydrosulfite, the escape concentration of SO ₂ was significantly reduced, and the temperature rise was relatively slow, indicating that the fire extinguishing agent of the present invention can be used In the fire fighting of insurance powder.

From the comparison of Examples 1 to 5, it can be seen that the fire extinguishing effects of Example 1, Example 2, Example 3, Example 4, and Example 5 on the hydrosulfite are sequentially enhanced.

From the comparison between Example 1 and Example 2, it can be seen that the mass parts of disodium hydrogen phosphate, diammonium hydrogen phosphate and sodium silicate in the fire extinguishing agent formulations of Example 1 and Example 2 are the same, the difference is that in Example 1, ethylene glycol It is 10 parts by mass, and ethylene glycol is 50 parts by mass in Example 2; the fire extinguishing effect of the fire extinguishing agent in Example 2 is better than that in Example 1, and it is speculated that ethylene glycol helps to strengthen the extinguishing agent of the fire extinguishing agent to the hydrosulfite. Effect.

It can be seen from the comparison between Example 2 and Example 3 that in the case where the mass parts of ethylene glycol and water are similar in the fire extinguishing agent formulation, increasing the mass parts of disodium hydrogen phosphate, diammonium hydrogen phosphate and sodium silicate will help. Further improve the extinguishing effect of the fire extinguishing agent on the hydrosulfite.

From the comparison of Example 3, Example 4, and Example 5, it can be known that in the case of the same or similar mass parts of disodium hydrogen phosphate, ethylene glycol and water in the fire extinguishing agent formulation, the increase in the concentration of diammonium hydrogen phosphate and sodium silicate parts by mass, which will help to further improve the extinguishing effect of the fire extinguishing agent on the hydrosulfite; in addition, the disodium hydrogen phosphate in the fire extinguishing agent formula is replaced with a lower mass part of ammonium dihydrogen phosphate, and the mass part of sodium silicate is increased at the same time, Helps to further enhance the extinguishing effect of the fire extinguishing agent on the insurance powder.

Embodiment 6 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

1 mass part of ammonium dihydrogen phosphate, 8 mass parts of diammonium hydrogen phosphate, 3 mass parts of sodium silicate, 45 mass parts of ethylene glycol, and 43 mass parts of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 6, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

Taking 800Kg of insurance powder as the fire extinguishing test object, the fire extinguishing dose used is 300Kg.

The specific test process is as follows:

Pour 800kg of hydrosulfite into the above-mentioned iron bucket, and after laying it flat, use an open flame to ignite the hydrosulfite in the bucket. After a large amount of gas and smoke are released, the process is about 2 minutes. Pour the above 300kg of fire extinguishing agent on the hydrosulfite for 2 minutes. After that, the SO ₂ concentration was detected as 217 ppm above the mouth of the iron drum, and after 10 minutes, the SO ₂ concentration was detected as 87 ppm above the mouth of the iron drum.

Embodiment 7 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

2 parts by mass of sodium dihydrogen phosphate, 6 parts by mass of diammonium hydrogen phosphate, 4 parts by mass of sodium silicate, 45 parts by mass of ethylene glycol, and 43 parts by mass of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 7, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 800kg of hydrosulfite into the above-mentioned iron bucket. After laying it flat, use the electric furnace wire to ignite the hydrosulfite in the bucket. After a large amount of gas and smoke are released, the process is about 3 minutes. Pour the above 300kg of fire extinguishing agent on the hydrosulfite , 2min later, the SO ₂ concentration was detected as 1867ppm above the mouth of the iron drum, 10min later, the SO ₂ concentration above the drum mouth was detected as 417ppm, 30min later, the SO ₂ concentration above the drum mouth was detected as 156ppm.

Embodiment 8 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

2 parts by mass of ammonium dihydrogen phosphate, 5 parts by mass of diammonium hydrogen phosphate, 5 parts by mass of sodium silicate, 0.5 parts by mass of octanol polyoxyethylene ether, 45 parts by mass of ethylene glycol, and 42.5 parts by mass of water.

A hydrosulfite fire-extinguishing test is carried out to the fire-extinguishing agent in the present embodiment 8, and the concrete test method and effect are as follows:

Test equipment: Φ1000mm×1000mm open iron drum.

Take 800Kg of hydrosulfite as the fire extinguishing test object, and the fire extinguishing dose used is 100Kg.

The specific test process is as follows:

Pour 800kg of hydrosulfite into the above-mentioned iron bucket, and after laying it flat, use the electric furnace wire to ignite the hydrosulfite in the bucket. After a large amount of gas and smoke are released, the process is about 3 minutes, and the above 100kg of fire extinguishing agent is poured onto the hydrosulfite. , 2min later, the SO ₂ concentration was detected as 1057ppm above the mouth of the iron drum, 10min later, the SO ₂ concentration was detected above the drum mouth to be 427ppm, and after 30min, the SO ₂ concentration above the drum mouth was detected to be 265ppm.

Embodiment 9 A kind of hydrosulfite fire extinguishing liquid fire extinguishing agent

2 parts by mass of ammonium dihydrogen phosphate, 6 parts by mass of diammonium hydrogen phosphate, 5 parts by mass of sodium silicate, 1.5 parts by mass of octanol polyoxyethylene ether, 44 parts by mass of ethylene glycol, and 41.5 parts by mass of water.

Test equipment: Φ1000mm×1000mm open iron drum.

The specific test process is as follows:

Pour 800kg of hydrosulfite into the above-mentioned iron bucket. After laying it flat, use the electric furnace wire to ignite the hydrosulfite in the bucket. After a large amount of gas and smoke are released, the process is about 3 minutes. Pour the above 300kg of fire extinguishing agent on the hydrosulfite , _2min later, the SO ₂ concentration was 438ppm detected above the mouth of the iron drum, and 173ppm was detected above the mouth of the iron drum after 10min.

The extinguishing effect index of embodiment 6～9 fire-extinguishing agent is shown in table 2 after the open flame of hydrosulfite is ignited, and simultaneously

Example 5, Comparative Example 1 The fire-extinguishing index of hydrosulfite is attached in Table 2 as a reference.

Table 2 Fire-extinguishing performance indexes of different formulations of hydrosulfite fire-fighting liquid fire extinguishing agents

As can be seen from Table 2, compared with Comparative Example 1, after spraying the fire extinguishing agents of Examples 6 to 9 to the burning hydrosulfite, the escape concentration of SO ₂ was significantly reduced, indicating that the fire extinguishing agent of the present invention can be used for hydrosulfite fires save.

From the comparison between Example 5 and Example 6, it can be seen that the consumption of the fire extinguishing agent in Example 6 is lower than that in Example 5, and after spraying the fire extinguishing agent for 2min, the escape concentration of SO ₂ is lower than that in Example 5, indicating that Example 6 extinguishes the fire. The extinguishing effect of the agent on the hydrosulfite is still better than that of the fire extinguishing agent in Example 5; comparing the formulas of Example 5 and Example 6, it can be seen that the mass parts of diammonium hydrogen phosphate in Example 6 are higher than that of Example 5. 5. It shows that diammonium hydrogen phosphate in the fire extinguishing agent formula plays an important role in the extinguishing of hydrosulfite.

From the comparison of Example 7, Example 8, and Example 9, it can be seen that the consumption of the fire extinguishing agent in Example 8 is lower than that in Example 7, and the two have similar extinguishing effects on hydrosulfite; Example 9 and Example 7 are in the same dosage situation. , the extinguishing effect of embodiment 9 to hydrosulfite is significantly better than that of embodiment 7, it is shown that the extinguishing agent of embodiment 8 can reach the extinguishing effect of the extinguishing agent of embodiment 7 to hydrosulfite under low dosage, it can be reasonably inferred that in the same Under the dosage, the extinguishing effect of the fire extinguishing agent in Example 8 on hydrosulfite is better than that in Example 7, and the conclusion is confirmed by the comparison between Example 7 and Example 9.

Comparing the formulations of Example 7, Example 8, and Example 9, it can be seen that when the mass parts of diammonium hydrogen phosphate, sodium silicate, ethylene glycol, and water are the same or similar, adding ammonium dihydrogen phosphate The extinguishing effect of the fire extinguishing agent on the hydrosulfite is better than that of adding disodium hydrogen phosphate, and the addition of octanol polyoxyethylene ether helps to further improve the extinguishing effect of the fire extinguishing agent on the hydrosulfite.

Embodiment 11 A kind of slow-release hydrosulfite

The present embodiment provides a kind of slow-release hydrosulfite, and its formula is as follows:

0.3 parts by mass of ammonium dihydrogen phosphate, 2 parts by mass of diammonium hydrogen phosphate, 4 parts by mass of ethylene glycol, 0.5 parts by mass of sodium silicate, and 93.2 parts by mass of hydrosulfite.

The preparation method of above-mentioned slow-release hydrosulfite comprises the following steps:

(1) Add ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ethylene glycol, and sodium silicate in the formula into water, and after thorough mixing, cool down to -3°C to 5°C, wherein the amount of water is the same as the sodium hydrosulfite in the formula. It is suitable to be between 1 and 10% of the weight.

(2) After cooling the hydrosulfite in the formula to -3°C to 5°C, mix with the mixed solution in step (1), store at -3°C to 5°C for 1 to 2 days, and then dry at low temperature to obtain Sustained release insurance powder.

The slow-release hydrosulfite prepared in the present embodiment is subjected to SO release detection, and the _hydrosulfite without any addition is used as a control at the same time, and the specific test process and test results are as follows:

Weigh 50 g of the control hydrosulfite and the slow-release hydrosulfite of this embodiment respectively, put them in a flask, and detect the maximum concentration value of SO ₂ released by the two in a natural state. Continuous detection for 4 days, calculate the average release of SO ₂ in 24h, the average release of SO ₂ in 48h, the average release of SO ₂ in 72h, and the average release of SO ₂ in 96h, and count the 90h~96h Average release of SO2 _over time period.

The test results are shown in Table 3. In Table ₃ , "24h" represents the average release of SO2 within 24h, and the rest are the same.

Table 3 Statistical table of release situation of slow-release hydrosulfite and control hydrosulfite SO ₂

保险粉样品Hydrosulfite samples	SO ₂的最大值 SO ₂ max	24h24h	48h48h	72h72h	96h96h	90h～96h90h～96h
对照保险粉Control insurance powder	336ppm336ppm	302ppm302ppm	267ppm267ppm	154ppm154ppm	97ppm97ppm	46ppm46ppm
缓释型保险粉Sustained release insurance powder	95ppm95ppm	89ppm89ppm	83ppm83ppm	80ppm80ppm	75ppm75ppm	72ppm72ppm

It can be seen from Table 3 that compared with the control hydrosulfite, the maximum release value of SO ₂ of the slow-release hydrosulfite in the natural state was reduced by 2.54 times. Under the state, the concentration of SO ₂ released is relatively stable, and the rate of SO ₂ released is relatively slow.

Embodiment 12 A kind of slow-release hydrosulfite

0.3 parts by mass of ammonium dihydrogen phosphate, 4 parts by mass of diammonium hydrogen phosphate, 6 parts by mass of ethylene glycol, 1.2 parts by mass of sodium silicate, and 88.5 parts by mass of hydrosulfite.

(2) After cooling the hydrosulfite in the formula to -3°C to 5°C, mix it with the mixed solution in step (1), store it at -3°C to 5°C for 1 to 2 days, and then dry it at low temperature to obtain Sustained release insurance powder.

The test results are shown in Table 4. In Table 4, "24h" represents the average release of SO ₂ within 24h, and the rest are the same.

Table 4 Statistical table of release situation of slow-release hydrosulfite and control hydrosulfite SO ₂

保险粉样品Hydrosulfite samples	SO ₂的最大值 SO ₂ max	24h24h	48h48h	72h72h	96h96h	90h～96h90h～96h
对照保险粉Control insurance powder	403ppm403ppm	367ppm367ppm	325ppm325ppm	237ppm237ppm	87ppm87ppm	39ppm39ppm
缓释型保险粉Sustained release insurance powder	57ppm57ppm	51ppm51ppm	49ppm49ppm	47ppm47ppm	46ppm46ppm	46ppm46ppm

It can be seen from Table 4 that compared with the control hydrosulfite, the maximum release value of SO ₂ of the slow-release hydrosulfite in the natural state is reduced by 6.07 times. Under the state, the concentration of SO ₂ released is relatively stable, and the speed of SO ₂ released is relatively slow. The results are consistent with the results of the sustained-release hydrosulfite in Example 11.

Example 13 Performance test of slow-release hydrosulfite

In this example, the sustained-release hydrosulfite prepared in Example 12 was taken as an example to explore the water stability of the sustained-release hydrosulfite and the controllability of the sustained-release hydrosulfite to release sulfur dioxide.

1. Water stability test of sustained-release hydrosulfites

Weigh respectively hydrosulfite without any addition (as control hydrosulfite), 15g of slow-release hydrosulfite prepared in Example 12, place in a flask, add 15mL of clear water to the flask, and detect the sulfur dioxide release amount of two hydrosulfite samples The maximum value, and contact the detection for 2 days, and record the average sulfur dioxide release of the two hydrosulfite samples within 3h, 12h, 18h, 24h, 48h, and between 42h and 48h.

The test results are shown in Table 5. In Table 5, "3h" represents the average release of SO ₂ within 3h, and the rest are the same.

Table 5 Statistical table of SO ₂ release after slow-release hydrosulfite and control hydrosulfite in contact with water

As can be seen from Table 5, compared with the control hydrosulfite, the maximum value of the sulfur dioxide released by the slow-release hydrosulfite is only 13.7% of the control hydrosulfite, and the change in the amount of sulfur dioxide released for two consecutive days is only 589ppm, while the control is only 589ppm. The amount of sulfur dioxide released by the group of hydrosulfites for two consecutive days changed as high as 23389ppm.

It can be seen from the comparison of the above results that the slow-release hydrosulfite of the present invention is relatively slow and relatively stable in reaction to water compared with industrial hydrosulfite, which can effectively prevent fire accidents and environmental pollution caused by rapid reaction of hydrosulfite and water in transportation and storage environments. Therefore, the sustained-release hydrosulfite of the present invention has good transportation and storage safety.

2. Controllability test of release sulfur dioxide from slow-release hydrosulfite

Weigh 10g of the sustained-release hydrosulfite prepared in Example 12 and place it in a flask, add 10 mL of clear water, and the release of the sustained-release hydrosulfite sulfur dioxide within 48 hours is shown in Table 5; after 48h, add an acidic solution to it (such as acetic acid), the maximum release amount of sulfur dioxide was measured to be 9937ppm; after 24 hours of continuous detection, the average release amount of sulfur dioxide in 3 hours was 9554ppm, the average release amount of sulfur dioxide in 6 hours was 8617ppm, and the average release amount of sulfur dioxide in 12 hours was 8617ppm. The average release amount of sulfur dioxide was 7321ppm, the average release amount of sulfur dioxide within 18 hours was 6035ppm, and the average release amount of sulfur dioxide within 24 hours was 5162ppm.

It can be seen from the above results that after adding water to the slow-release hydrosulfite for 48 hours, and then adding the acid solution, the release of sulfur dioxide of the slow-release hydrosulfite increases by 3.68 times, and after adding the acid solution, the release rate of the slow-release hydrosulfite sulfur dioxide is increased. relatively stable. It is shown that when a large amount of sulfur dioxide needs to be used, the slow-release hydrosulfite of the present invention can accelerate the reaction of hydrosulfite and water by adding an appropriate amount of acid solution, thereby quickly obtaining a large amount of sulfur dioxide; and by adjusting the pH of the solution to control the amount of sulfur dioxide. Release to ensure smooth and controllable use.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that, The technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

A composition for hydrosulfite fire fighting liquid fire extinguishing agent or slow-release hydrosulfite, characterized in that the composition comprises diammonium hydrogen phosphate, sodium silicate and ethylene glycol.
The composition for hydrosulfite fire fighting liquid fire extinguishing agent or slow-release hydrosulfite according to claim 1, characterized in that, the composition comprises 0.5-10 mass parts of diammonium hydrogen phosphate, 0.5-10 mass parts of sodium silicate and 4 to 50 parts by mass of ethylene glycol.
A hydrosulfite fire extinguishing liquid fire extinguishing agent is characterized in that, the extinguishing agent comprises 0.5-10 mass parts of diammonium hydrogen phosphate, 0.5-10 mass parts of sodium silicate and 4-50 mass parts of ethylene glycol.
The hydrosulfite fire extinguishing liquid extinguishing agent according to claim 3, characterized in that, the extinguishing agent further comprises 0.5-10 parts by mass of disodium hydrogen phosphate, dipotassium hydrogen phosphate or ammonium dihydrogen phosphate.
The hydrosulfite fire extinguishing liquid extinguishing agent according to claim 3 or 4, characterized in that, the extinguishing agent further comprises 0.2-2 mass parts of alkyl polyoxyethylene ether.
The hydrosulfite fire extinguishing liquid extinguishing agent according to claim 5, characterized in that, the extinguishing agent further comprises 40-88.5 parts by mass of water.
The hydrosulfite fire extinguishing liquid fire extinguishing agent according to claim 6, wherein the extinguishing agent comprises 1-2 parts by mass of ammonium dihydrogen phosphate, 5-8 parts by mass of diammonium hydrogen phosphate, 1-5 parts by mass of sodium silicate, 44-45 parts by mass of ethylene glycol and 43-45 parts by mass of water.
A sustained-release hydrosulfite, characterized in that the sustained-release hydrosulfite comprises 0.5-10 parts by mass of diammonium hydrogen phosphate, 0.5-10 parts by mass of sodium silicate and 4-50 parts by mass of ethylene glycol .
The sustained-release hydrosulfite according to claim 8, characterized in that, the sustained-release hydrosulfite further comprises 0.2-10 parts by mass of ammonium dihydrogen phosphate.
The sustained-release hydrosulfite according to claim 9, wherein the sustained-release hydrosulfite comprises 0.2-0.5 parts by mass of ammonium dihydrogen phosphate, 2-4 parts by mass of diammonium hydrogen phosphate, 0.5-1.2 parts by mass parts of sodium silicate and 4 to 6 parts by mass of ethylene glycol.