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Preparation method of dry powder extinguishing agent containing allophanate

A dry powder fire extinguishing agent, allophanate technology, applied in fire protection equipment and other directions, can solve the problems of easy moisture absorption and agglomeration, poor fluidity, unable to meet the needs of fire safety situation, etc., to achieve good storage, good hydrophobicity and The effect of fluidity and outstanding fire extinguishing efficiency

Pending Publication Date: 2021-12-24
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, compared with gas fire extinguishing agents, foam fire extinguishing agents and water-based fire extinguishing agents, dry powder fire extinguishing agents also have the advantages of outstanding fire extinguishing performance, easy access to raw materials, convenient storage and transportation, simple use and environmental friendliness. Therefore, dry powder fire extinguishing agents have Extensive market demand, however, conventional dry powder fire extinguishing agents are prone to moisture absorption and agglomeration, poor fluidity, and few effective fire extinguishing components, resulting in low fire extinguishing efficiency and cannot meet the growing fire safety situation.

Method used

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  • Preparation method of dry powder extinguishing agent containing allophanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 30g potassium allophanate, 18g potassium bicarbonate, 24g ammonium phosphomolybdate, 12g zinc borate and 16g urea are placed in a planetary ball mill, crushed and mixed by mechanical force to obtain the fire extinguishing agent precursor, wherein the ball mill speed is 300r / min, the grinding time is 1h, and the mass ratio of grinding body to mixture is 2:1.

[0031] Take 100g of the above-mentioned fire extinguishing agent precursor and add it to 500ml of deionized water, and use a cantilever stirrer to evenly stir to obtain an emulsion. The speed of the cantilever stirrer is 400r / min, and the stirring time is 10min;

[0032] Transfer the emulsion to a polytetrafluoroethylene reactor, and react to obtain the reaction product after the temperature program is raised. The temperature rise program is: raise the temperature from 25°C to 100°C in 30 minutes, keep it for 1 hour, and then raise the temperature from 100°C to 160°C in 60 minutes. , kept for 2h, cooled to room tem...

Embodiment 2

[0038] 45g of potassium allophanate, 15g of potassium bicarbonate, 12g of zinc carbonate, 12g of ammonium molybdate and 16g of molybdenum disulfide were placed in a planetary ball mill, pulverized and mixed by mechanical force to obtain a fire extinguishing agent precursor. The rotational speed of the ball mill is 350r / min, the grinding time is 1h, and the mass ratio of the grinding body to the mixture is 2:1.

[0039] Take 100g of the fire extinguishing agent precursor and add it to 500ml of deionized water, and stir evenly with a cantilever stirrer to obtain an emulsion. The speed of the cantilever stirrer is 450r / min, and the stirring time is 10min;

[0040] Transfer the emulsion to a polytetrafluoroethylene reactor, and react to obtain the reaction product after the temperature program is raised. The temperature rise program is: raise the temperature from 25°C to 100°C in 30 minutes, keep it for 1 hour, and then raise the temperature from 100°C to 160°C in 60 minutes. , ke...

Embodiment 3

[0046] Put 40g of sodium allophanate, 20g of sodium bicarbonate, 14g of manganese hypophosphite, 14g of cetyltrimethylammonium bromide and 12g of aluminum silicate in a planetary ball mill, crush and mix them by mechanical force to obtain a fire extinguishing agent Precursor. The rotational speed of the ball mill is 350r / min, the grinding time is 1h, and the mass ratio of the grinding body to the mixture is 2:1.

[0047] Take 100g of the fire extinguishing agent precursor and add it to 500ml of deionized water, and use a cantilever stirrer to evenly stir to obtain an emulsion. The speed of the cantilever stirrer is 500r / min, and the stirring time is 10min;

[0048] Transfer the emulsion to a polytetrafluoroethylene reactor, and react to obtain the reaction product after heating up the temperature. The heating program is as follows: raise the temperature from 25°C to 100°C in 30 minutes, keep it for 2 hours, and then raise the temperature from 100°C to 160°C in 60 minutes , ke...

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Abstract

The invention relates to a preparation method of a dry powder extinguishing agent containing allophanate, and belongs to the technical field of extinguishing materials. The dry powder extinguishing agent is obtained by prefabricating extinguishing components through a mechanochemical method, synthesizing the extinguishing components through a hydrothermal / solvothermal method and then performing surface modification through a modifier. The fire extinguishing components of the fire extinguishing agent comprise potassium allophanate and / or sodium allophanate, and at least two of potassium bicarbonate, sodium bicarbonate, zinc carbonate, zinc borate, zirconium phosphate, manganese hypophosphite, ammonium phosphomolybdate, ammonium molybdate, hexadecyl trimethyl ammonium bromide, urea, ferrocene, molybdenum disulfide, ferric chloride, aluminum silicate and magnesium hydroxide. The prepared dry powder extinguishing agent can absorb heat in a fire scene and release non-combustible gas, a large number of active chemical particles are generated to capture flame free radicals, and the extremely outstanding extinguishing effect is achieved. In addition, through surface modification of the modifier, the dry powder extinguishing agent further has good hydrophobicity and flowability, and storage, transportation and application of the extinguishing agent are better facilitated.

Description

technical field [0001] The invention belongs to the technical field of fire extinguishing materials, and in particular relates to a dry powder fire extinguishing agent containing allophanate salt and a preparation method thereof. Background technique [0002] According to statistics from the Ministry of Emergency Management, a total of 252,000 fires were reported throughout the year in 2020, with 1,183 deaths, 775 injuries, and direct property losses of 4.009 billion yuan. Fires have posed a great hazard to people's lives and property. As one of the most commonly used fire extinguishing media at present, dry powder fire extinguishing agent can be used to extinguish fires of water-soluble and non-water-soluble flammable and flammable liquids, fires of flammable gases such as natural gas and liquefied petroleum gas, and fires of general live equipment. At the same time, compared with gas fire extinguishing agents, foam fire extinguishing agents and water-based fire extinguishi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D1/00A62D1/06
CPCA62D1/0014A62D1/06
Inventor 张海军杨琪李坤狄逸儒
Owner CIVIL AVIATION UNIV OF CHINA
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