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A kind of preparation method of base carbonate of hydrophobic and oil-repellent BC type superfine dry powder fire extinguishing agent

A technology of hydrophobic and oleophobic, ultra-fine dry powder, which is applied in the preparation of alkali metal carbonate shape, fire prevention equipment, etc., can solve the problems of no industrial application, low fire extinguishing efficiency, poor recombustion resistance, etc., and achieve easy large-scale production, Excellent hydrophobic and oleophobic properties and strong adhesion

Active Publication Date: 2020-08-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the foreign patent US3553127 immerses the dry powder fire extinguishing agent in the organic solution of fluorocarbon surfactant, and the prepared carbonate dry powder fire extinguishing agent is insoluble in water, but slightly soluble in oil, has poor reflammability resistance, and has a large particle size and high fire extinguishing efficiency. Low, due to these shortcomings, this method has not been industrialized so far
Domestic published patent CN1597024 adopts silicone oil and fluorocarbon surfactant to dry-modify ABC type ammonium phosphate superfine powder respectively, and the superfine dry powder fire extinguishing agent after treatment can float on the surface of diesel oil and water. This process is not only complicated , and its modification temperature is around 140°C. This temperature will decompose ammonium dihydrogen phosphate. If the temperature is too low, the treatment effect will not be good, which limits its application. In addition, whether this method is suitable for BC ultrafine dry powder The fire extinguishing agent has not been researched, so in order to realize the hydrophobic and oil-repellent of the BC type ultrafine dry powder fire extinguishing agent, it is necessary to study the selection and treatment process of the surfactant

Method used

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  • A kind of preparation method of base carbonate of hydrophobic and oil-repellent BC type superfine dry powder fire extinguishing agent
  • A kind of preparation method of base carbonate of hydrophobic and oil-repellent BC type superfine dry powder fire extinguishing agent
  • A kind of preparation method of base carbonate of hydrophobic and oil-repellent BC type superfine dry powder fire extinguishing agent

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: the preparation of hydrophobic and oleophobic superfine sodium bicarbonate powder

[0031] (1) Use a supersonic jet mill to crush sodium bicarbonate into an ultrafine powder with a particle size of 90% ≤ 5 μm;

[0032] (2) Add the ultrafine powder to the methanol solution of γ-aminopropyltriethoxysilane (KH550) at room temperature for impregnation treatment, stir at 1000rpm for 1h, and the weight percentage of each substance is the ultrafine powder The amount of methanol is 10%, the amount of methanol is 89%, and the amount of KH550 is 1%;

[0033] (3) Suction filter after the reaction, wash, dry at 100°C, cool, pulverize, and pass through a 400-mesh standard sampling sieve;

[0034] (4) Add the treated ultrafine powder into the acetone solution of tridecafluorooctyltriethoxysilane for impregnation treatment, stir at 1000rpm for 10h, and the weight percentage of each substance is the amount of ultrafine powder The amount of acetone is 10%, the amount of ...

Embodiment 2

[0040] Embodiment 2: the preparation of hydrophobic and oleophobic superfine potassium bicarbonate powder

[0041] (1) Use a supersonic jet mill to crush potassium bicarbonate into ultrafine powder with 90% particle size ≤ 5 μm;

[0042] (2) Add the ultrafine powder into the acetone solution of γ-glycidyl etheroxypropyltrimethoxysilane (KH560) at room temperature for impregnation treatment, stir at 1000rpm for 2h, and the weight percentage of each substance is ultrafine The amount of powder is 10%, the amount of acetone is 67%, and the amount of KH560 is 3%;

[0043] (3) After the reaction, filter with suction, wash, dry at 110°C, cool, pulverize, and pass through a 400-mesh standard sampling sieve;

[0044] (4) Add the treated ultrafine powder into the n-hexane solution of heptadecafluorodecyltrimethoxysilane for impregnation treatment, stir at 1000rpm for 12h, and the weight percentage of each substance is the amount of ultrafine powder The amount of n-hexane is 5%, the am...

Embodiment 3

[0050] Embodiment 3: the preparation of hydrophobic and oleophobic superfine sodium bicarbonate powder

[0051] (1) Use a supersonic jet mill to crush sodium bicarbonate into an ultrafine powder with a particle size of 90% ≤ 5 μm;

[0052] (2) Add the ultrafine powder into the n-hexane solution of γ-aminopropyltriethoxysilane (KH550) at room temperature for impregnation treatment, stir at 1000rpm for 2h, and the weight percentage of each substance is ultrafine powder The amount of solid is 30%, the amount of n-hexane is 67%, and the amount of KH550 is 3%.

[0053] (3) After the reaction, filter with suction, wash, dry at 115°C, cool, pulverize, and pass through a 400-mesh standard sampling sieve;

[0054] (4) Add the treated ultrafine powder to the ethanol solution of perfluorodecyltriethoxysilane for impregnation treatment, stir at 1000rpm for 12h, and the weight percentage of each substance is the amount of ultrafine powder: 1%, the amount of ethanol is 98.9%, and the amou...

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Abstract

The invention discloses a method for preparing a base carbonate of hydrophobic and oil-repellent BC superfine dry powder fire extinguishing agent. The steps are: (1) Grinding the carbonate into ultra-fine powder with 90% particle size ≤ 5 μm; (2) Adding the ultra-fine powder into the organic solution of silane coupling agent for impregnation at room temperature; (3) ) Suction filtration after the reaction, washing, high temperature drying, cooling, crushing and sieving; (4) Adding the treated dry ultrafine powder into the fluorosilane organic solution for impregnation treatment; (5) Suction filtration after the reaction , washed, dried at high temperature, cooled, crushed and sieved to obtain superfine carbonate powder of hydrophobic and oleophobic. The ultrafine powder prepared by the invention not only has excellent hydrophobic and oleophobic properties, but also has high stability, can be used to prepare the ultrafine dry powder fire extinguishing agent and can quickly extinguish oil fires, and has the characteristics of high fire extinguishing efficiency and recombustion resistance.

Description

technical field [0001] The invention relates to the field of dry powder fire extinguishing agents, in particular to a method for preparing a base carbonate of a hydrophobic and oil-repellent BC type ultrafine dry powder fire extinguishing agent. Background technique [0002] With the gradual depletion of halon fire extinguishing agents, it is urgent to develop clean, efficient and environmentally friendly halon substitute fire extinguishing agents. Due to the advantages of high fire extinguishing efficiency, low toxicity and no pollution, dry powder fire extinguishing agents have become one of the most ideal substitutes for halon fire extinguishing agents. Among them, BC type dry powder fire extinguishing agents based on carbonates are widely used in extinguishing liquids. and gas fires, and the traditional carbonate dry powder fire extinguishing agent is easy to settle because most of the particle size is larger than the critical reaction particle size, and its thermal deco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D1/06C01D7/38
CPCA62D1/0014C01D7/38C01P2004/61
Inventor 付阳阳陆松张和平
Owner UNIV OF SCI & TECH OF CHINA