Preparation method of ultrafine dry powder extinguishing agent with good water repellency

A technology of ultra-fine dry powder and fire extinguishing agent, applied in fire protection equipment and other directions, can solve the problems of shortened shelf life, high moisture absorption rate, product caking, etc., and achieve the effect of excellent caking resistance, low production cost and material cost reduction.

Inactive Publication Date: 2018-03-23
BENGBU LONGTAI FIRE FIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, as the production process of ultra-fine dry powder fire extinguishing agents has become more and more mature, its fire extinguishing performance has also been greatly improved, and its applicable fire places and types of fires are also becoming more and more extensive. At present, most dry powder fire extinguishing agents on the market are Poor water quality and high moisture absorption rate make the product agglomerate and shorten the shelf life, which needs to be solved urgently

Method used

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  • Preparation method of ultrafine dry powder extinguishing agent with good water repellency

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A preparation method of superfine dry powder fire extinguishing agent with good water repellency, including the following steps:

[0021] S1. Mix 4g of raw gypsum, 6g of carbon nanotubes, 1g of phosphomolybdic acid, and 2g of magnesium carbonate powder uniformly, dry at 100°C, and grind to obtain a preform;

[0022] S2. Preheat 40g preform to 105°C, add 30g sodium bicarbonate, 18g monoammonium phosphate, 10g alum complex, 10g magnesium carbonate powder, 5g ammonium sulfate at a stirring speed of 1700r / min, and continue to stir for 50min. Sprinkle 2g of silicone oil into it while stirring, continue stirring for 15 minutes, add 4g of pentaerythritol and continue stirring for 50 minutes, dry, pulverize, and sieving. The mesh aperture is 25 μm to obtain an ultrafine dry powder fire extinguishing agent with good water repellency.

[0023] The alum complex is prepared by the following process: add 20g of alum to 80g of 40wt% ethanol solution and mix well, then add 15g of liquid para...

Embodiment 2

[0025] A preparation method of superfine dry powder fire extinguishing agent with good water repellency, including the following steps:

[0026] S1. Mix 8kg of raw gypsum, 2kg of carbon nanotubes, 2kg of phosphomolybdic acid, and 1kg of magnesium carbonate powder uniformly, dry at 118°C, and grind to obtain a preform;

[0027] S2. Preheat 20kg of preformed material to 115°C, add 50kg sodium bicarbonate, 10kg monoammonium phosphate, 20kg alum complex, 4kg magnesium carbonate powder, 10kg ammonium sulfate at a stirring speed of 1200r / min, and continue stirring for 30min. Spray 4kg of silicone oil into it while stirring, continue to stir for 5 minutes, add 10kg of pentaerythritol and continue stirring for 30 minutes, dry, pulverize, and sieving. The screen mesh has an aperture of 25 μm to obtain an ultrafine dry powder fire extinguishing agent with good water repellency.

[0028] The alum complex is prepared by the following process: add 30kg of alum to 60kg of 60wt% ethanol solution an...

Embodiment 3

[0030] A preparation method of superfine dry powder fire extinguishing agent with good water repellency, including the following steps:

[0031] S1. Mix 5kg of raw gypsum, 5kg of carbon nanotubes, 1.2kg of phosphomolybdic acid and 1.8kg of magnesium carbonate powder, dry at 105°C, and grind to obtain a preform;

[0032] S2. Preheat 35kg of preform to 108°C, add 35kg sodium bicarbonate, 16kg monoammonium phosphate, 12kg alum complex, 8kg magnesium carbonate powder, 6kg ammonium sulfate at a stirring speed of 1600r / min, and continue to stir for 45min. Sprinkle 2.5 kg of silicone oil into it under stirring, continue stirring for 12 minutes, add 6 kg of pentaerythritol and continue stirring for 45 minutes, dry, pulverize, and sieving. The mesh aperture is 25 μm to obtain an ultrafine dry powder fire extinguishing agent with good water repellency.

[0033] The alum complex is prepared by the following process: add 22kg of alum to 75kg of 45wt% ethanol solution and mix well, then add 12kg ...

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Abstract

The invention discloses a preparation method of an ultrafine dry powder extinguishing agent with good water repellency. The preparation method comprises the following steps: gypsum, carbon nanotubes,phosphomolybdic acid and magnesium carbonate powder are uniformly mixed for drying and grinding to obtain precast materials; the precast materials are preheated; sodium bicarbonate, monoammonium phosphate, alum compounds, magnesium carbonate powder and ammonium sulfate are added in sequence in a stirring state for continuous stirring; silicone oil is sprayed inside in the stirring state for continuous stirring; pentaerythritol is added for continuous stirring; and the ultrafine dry powder extinguishing agent with good water repellency is obtained through drying, crushing and screening. The alum compounds are prepared by adopting the following process: alums are added in ethanol solution for uniform mixing; liquid paraffin is added for heat stirring, filtering and spray stirring; magnesiumstearate, pentaerythritol and white oil are added in sequence in the stirring state for uniform stirring; and the alum compounds are obtained through cooling. The preparation method is simple and lowin production cost; and the prepared dry powder extinguishing agent is excellent in fire extinguishing performance, and achieves excellent water repellency, fluidity and caking resistance.

Description

Technical field [0001] The invention relates to the technical field of dry powder fire extinguishing agents, in particular to a method for preparing superfine dry powder fire extinguishing agents with good water repellency. Background technique [0002] Ultrafine dry powder fire extinguishing agent is a kind of ultrafine powder fire extinguishing agent with high fire extinguishing efficiency, dry and easy to flow. It is mainly composed of active fire extinguishing components, crushing aid components, hydrophobic components, inert filler components and so on. The fire extinguishing principle is mainly as follows: First, the volatile decomposition products of the inorganic salt in the powder and the free radicals or active groups produced by the fuel during the combustion process chemically inhibit and side-catalyze, so that the combustion chain reaction is interrupted and the fire is extinguished; The second is to rely on the fine powder falling on the surface of the burning mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D1/00A62D1/06
CPCA62D1/0014A62D1/0064A62D1/06
Inventor 卢思迪王伟鲁怀宁左振王哲
Owner BENGBU LONGTAI FIRE FIGHTING
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