RU1813464C - Fire-extinguishing composition frothing in center of fire - Google Patents

Abstract

Use: for extinguishing fires of solid materials and combustible liquids. The essence of the invention: to extinguish using a fire extinguishing composition, foaming in the fire and containing, wt.%: Halogenated hydrocarbons 0.6-12.8, laprol 0.825-12.8, cationic fluorine-containing surfactant 0.38-6.4 and water the rest. As a cationic fluorine-containing surfactant, a compound of the formula F (CF2) 8C (0) N (H) C2H6N (CH3) 2C2H40H) C is used. 1 s.p. crystals, 1 tab.

Description

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FIELD OF THE INVENTION This invention relates to fire extinguishing means for solid materials and combustible liquids that contain dissolved halocarbons and spontaneously form foam when they enter a fire. The purpose of the invention is to increase the efficiency of the composition which foams in the fire area when extinguishing a flame of solid materials. The expected positive effect of the use of the invention is 2 ... 4 times compared with the prototype.

To achieve the goal in the proposed composition, polyester - paprol is used as a solvent, and a cationic fluorine-containing surfactant (KFPA) is used as a stabilizer in the following ratio of components, wt.%: Halocarbon 0.6-12.8 Laprol 0.825-12.8 KFPAV 0.38-6.4 Water Else

As KFPA used the compound of the formula

F (CF2) 8C (0) N (H) C2H6N (CH3) 2C2H40H CI.

The proposed composition is prepared and stored in the form of an anhydrous concentrate, which is a homogeneous solution. Due to the unlimited solubility of halocarbons and KFPA in laprol, the latter is a concentrate stabilizer preventing the volatilization of halocarbons before volatilization. An aqueous solution composition is used. When a concentrate of the composition is diluted with an aode, the homogeneous system passes into a highly dispersed emulsion of halocarbon in an aqueous solution. Due to the high surface activity of KFPA in the resulting aqueous organic system, this emulsion is stabilized against delamination

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neither. The small amount of halocarbon droplets in the emulsion provides uniform boiling of the composition throughout the volume and the formation of highly dispersed foam when the composition enters the fire (on a heated surface). The properties of the resulting foam are more optimal for eliminating the burning of solids than the properties of the foam of the prototype composition (a greater dispersion causes a higher viscosity of the foam, and therefore, its greater adhesion).

The invention is carried out as follows. The extinguishing agent is prepared in the form of an anhydrous concentrate, which is dissolved in the required amount of water before use. The preparation of the concentrate is carried out in two stages. In the first stage, the halocarbon is dissolved in laprol; in the second stage, the resulting solution is mixed with KOPAV. To prepare the composition, tetrafluorodibromoethane was used as halocarbon, and a 50 wt.% Solution of quaternary ammonium salt of perfluoropelargaronic acid in ethylene glycol, manufactured by the industry under the name POF-9, was used as KPAV. Laprol used brand L-402.

1. 120 g of tetrafluorodibromoethane was dissolved in 165 g of laprol L-402. 152 g POF-9 was added to the resulting mixture and mixed until a homogeneous solution was obtained. The resulting composition was dissolved in 16314 g of water.

2. 40 g of tetrafluorodibromoethane was dissolved in 55 g of laprol L-402. To the resulting mixture was added 20 g POF-9 and mixed until a uniform solution was formed. The resulting composition was dissolved in 1885 g of water.

3. In 128 g of Laprol L-402, 128 g of tetrafluorodibromoethane was dissolved and mixed until a homogeneous solution was obtained. The resulting composition was mixed with 128 g POF-9. The finished composition was dissolved in 616 g of water.

The properties and composition of the prepared specific samples of the proposed composition in

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Comparison with the properties of known composition are given in the table. Fire extinguishing efficiency was determined by the extinguishing time of the stacks of rubber at a feed rate of the proposed and known compositions (0.15 ± 0.01) kg / m2 s in accordance with the methodology of VNIIPO.

The limits of the content of halocarbons, laprol and KFPA are due, on the one hand, to a decrease in its fire extinguishing efficiency to the level of the prototype when their content is wt.%: 0.6; 0.825; 0.38, respectively, on the other hand, in that the increase in their content is higher than 12.8; 12.8; 6.4%, respectively, almost does not increase the extinguishing effectiveness of the composition.

Higher fire extinguishing properties of the proposed composition in relation to solid materials (as compared with the prototype) can significantly reduce its consumption for extinguishing fires, which makes it possible to use fewer technical means (fire pipelines, pumps, shafts) or use equipment with lower performance.

Claims (2)

1. Fire extinguishing composition, foaming in the fire, including liquid halocarbon, solvent, stabilizer of water dispersion and water, characterized in that, in order to increase efficiency in extinguishing fires of solid materials, it contains laprol as a solvent, and as a stabilizer, a cationic fluorine-containing surfactant in the following ratio of components, wt.% halogenated - 0.6-12.8; laprol - 0.825-12.8; cationic fluorine-containing surfactant - 0.38-6.4; water - the rest 2. The composition according to claim 1, characterized in that as a cationic surfactant it contains a compound of the formula F (CF2) 8C (0) N (H) C2H6N (CH3) 2C2H40H CI. 5 0 5 0 5