RU2489189C2 - Method of producing and composition of multipurpose fire extinguishing powder - Google Patents

Abstract

FIELD: fire-fighting facilities.

SUBSTANCE: invention relates to the field of production of fire extinguishing powders, namely to the method of preparing multipurpose fire extinguishing powder extinguishing fires of Class A, B, C and E. The method comprises mixing, drying and grinding of hydrophobisated and target additives and also a main component. As a hydrophobisated additive, a mixture of microtalc [mass fraction of sieve residue No. 0045,% - no more than 0.5, the average median particle diameter (D₅₀), mcm 8-I1 (laser particle analyser "Microsizer 201 A")] with synthetic fatty acids in the ratio microtalk/free fatty acids 10÷0.5-2.5. Also a multipurpose dry chemical powder is provided.

EFFECT: invention enables to reduce material and energy costs, labour intensity of production of fire extinguishing powder.

2 cl, 1 tbl

Description

The invention relates to the field of producing fire extinguishing powders that can be used to extinguish class A, B, C, and E fires. The closest in technical essence to the claimed invention are fire extinguishing powder composition and a method for producing it, including a finely dispersed additive, target additive for fluidity, hydrophobic organosilicon liquid and the main component, characterized in that it contains components of the composition in the following ratio, wt.%:

Fine Additive 2-4 Target additive for fluidity 3-11 Main component Rest

moreover, as a highly dispersed additive, it contains white soot, hydrophobized with an organosilicon liquid, polymerized on the surface of its particles, and the components are taken in the following ratio, wt.%:

White soot 95-97 Water-repellent organosilicon liquid Rest

A fire extinguishing composition, characterized in that it contains corundum powder or aluminosilicate as the target fluidity additive, it contains ammophos and ammonium sulfate as the main component in the following ratio, wt.%:

Ammophos 5-100 Ammonium sulfate Rest

A method of obtaining a fire extinguishing powder composition, including separate drying, grinding, hydrophobization with an organosilicon liquid and co-mixing the components of the composition, while the carbon black is subjected to hydrophobization, which is pre-dried to a moisture content of not more than 0.25 wt.%, Then it is ground, mixed with organosilicon liquid in the ratio, wt.%:

White soot 95-97 Water-repellent organosilicon liquid Rest

and kept at a temperature of 150-200 ° C until the polymerization of the organosilicon liquid is achieved on the surface of the soot particles [1] (RF patent 2194555, C1 A62D 1/00, 2002).

The disadvantages of this extinguishing powder composition include the complexity of the method for its preparation, high energy consumption and time for hydrophobization of an organosilicon liquid, relatively low extinguishing ability (with low fluidity) and a significant tendency to moisture absorption, the use of expensive and scarce raw materials (white carbon and organosilicon liquids).

The objective of the invention is a method for producing fire extinguishing powder with low material, energy consumption and the complexity of obtaining corresponding to all requirements of GOST R 53280.4-2009.

The task is achieved by using as a finely dispersed water-repellent additive a mixture of microtalc according to TU 5727-001-40705684-2001 “Microtalc fractional, Standard series [mass fraction of residue on sieve No. 0045,% - not more than 0.5; average median particle diameter (D ₅₀ ), microns - 8 ÷ 11 (Microsizer 201A laser particle analyzer)] with synthetic fatty acids in the ratio microtalc / FFA = 10 ÷ 0.5-2.5.

The concentration of highly dispersed water-repellent additives is 2-15% of the total mass of the extinguishing powder, mainly 8-10%.

Ammophos, sodium bicarbonate, sylvinite, sodium chloride, potassium chloride, silica, nepheline, phlogopite, ammonium sulfate are used as the main component.

As a target additive, powdered quartz, talc, talc magnesite, calcium carbonate, dolomite, calcite, chalk, magnesite, silica sand, natural phosphorites - apatite, phosphorite flour are used.

As synthetic fatty acids, one of the series is used: stearic, oleic, palmitic, linoleic, linolenic, capric, lauric, margaric and their analogues or mixtures thereof.

A hydrophobic additive of a mixture of microtalc with FFA is prepared as follows: microtalc is loaded into a paddle mixer and FLC is loaded therein in the ratio microtalc / FFA = 10 ÷ 0.5-2.5. The mixture is stirred at a temperature of 5-50 ° C for 30-120 minutes until they are completely mixed.

Obtaining fire extinguishing powder is carried out in a screw mixer. To do this, the components of the composition are loaded into the screw mixer with the stirring device operating in the following order: the main component, the target and water-repellent additives. The components of the composition are mixed for 30-40 minutes, then discharged into a receiving hopper, from where they are fed with a screw into a ball mill, where they are ground for 40-50 minutes. After the ball mill, the resulting mixture is fed into the drying chamber and dried for 30-40 minutes to a moisture content of not more than 0.3%.

For experimental verification of the claimed object was prepared a series of powders. The extinguishing ability of the powders and their operational properties were determined in accordance with GOST R 53280.4-2009 “Automatic fire extinguishing installations. Extinguishing agents. Part 4. General purpose fire extinguishing powders. General technical requirements. Test Methods ”, in accordance with which acceptance tests of fire extinguishing powders are conducted in Russia. Fire extinguishing powder of known composition (prototype) was prepared as described [1].

The essence of the invention is illustrated by the examples set forth in table 1.

Examples 1, 2, 3 show that at a concentration of a hydrophobizing additive within the indicated limits, the fire extinguishing powder fully complies with all the requirements of GOST R 53280.4-2009.

In examples 4 and 5, the hydrophobizing additive was taken in concentrations lower and higher than the declared ones and it can be seen that in example 4 the indicators: the tendency to moisture absorption, caking, the remainder of the powder in the fire extinguisher and fire extinguishing efficiency according to class A do not meet the requirements of GOST R 53280.4-2009.

In example 5, fluidity, residue in a fire extinguisher and extinguishing efficiency of class B also does not meet the requirements of GOST R 53280.4-2009.

Claims (2)

1. A method of obtaining a multi-purpose fire extinguishing powder for extinguishing fires of class A, B, C and E, comprising mixing, drying and grinding water-repellent and target additives, as well as the main component, characterized in that as a water-repellent additive use a mixture of microtalc [mass fraction of residue on sieve No. 0045,% - not more than 0.5; average median particle diameter (D ₅₀ ), microns 8 ÷ 11 (laser analyzer of particles “Microsizer 201A”)] with synthetic fatty acids in the ratio microtalc / FFA 10 ÷ 0.5-2.5. 2. Multipurpose fire extinguishing powder obtained according to claim 1, consisting of a hydrophobic and target additives and a main component, characterized in that the concentration of highly dispersed hydrophobic additives is 2-15 wt.% Of the total weight of the fire extinguishing powder.