SU1128963A1 - Foaming agent for fire extinguishing - Google Patents

Abstract

FOAM FORM FOR EXTINGUISHING FIRES, including a surfactant, basic aluminum chloride, derived from the fact that, in order to reduce the composition while maintaining the quality of the foam, it additionally contains sodium chloride at the following ratio of components, wt.%: Surface -active substance 0.02-0.2 Primary aluminum chloride 0.5-2, O Sodium chloride 0.5-4.0 Water. Others

Description

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0: bo The invention relates to the production of foam-forming compositions for the manufacture of air-mechanical foam used in the pre-heat. It is known that water and the surfaces of the active substance are the main components of all foaming compositions. Natural and synthetic compounds Cescian are used as surface-active substances in foams. To increase the effectiveness of fire fighting, foaming formulations also include foam stabilizers and other additives that improve the quality of the foam, i A foam-forming composition based on an aqueous alkaline extract in a powder form, containing protein extract, a protective colloid, and, as a foam stabilizer, soluble metal-containing complexes in water, ammonia of transition metals Ij. The disadvantages of the foaming composition are the use of natural substances in it and the complicated technology of its production. Also known is the composition of foam like a pad, in which synthetic surface-active agents are used as a foaming base, and monoammonium aluminum chloride 2 as a foam stabilizer. A disadvantage of the composition is the use of monoammyacate aluminum chloride, the production of which is a multistage process, carried out in an anhydrous medium under an inert gas atmosphere. The closest to the proposed technical essence and the achieved result is a composition that includes a synthetic surfactant, as a foam stabilizer they use bases of aluminum salt, for example, OQHOB aluminum chloride - A1 (OH) .C1 and water. The composition containing, in wt.%: Surfactant 0.02-4;. Main aluminum chloride 2-40; the rest of the water gives high quality fire extinguishing foam. The disadvantage of the composition is its relatively high cost. The purpose of the invention is to reduce the cost of the composition while maintaining the quality of the foam. The goal is achieved by the fact that the composition additionally contains sodium chloride in the following ratio of components, wt.%: Surface-active substance 0.02-0.2 Primary aluminum chloride 0.5-2.0. Sodium chloride 0.5-4.0 Water Else In order to obtain comparative data of the composition with the prototype, the boundary concentrations of the compositions were tested for foam resistance and fire extinguishing efficiency. Determination of foam resistance is carried out under standard conditions at room temperature. Foam is obtained on the device Shredder tissue RT-1, MRTU 42-1506-63. In a beaker with 80 ml of an aqueous solution containing 4 g of sodium chloride and 1 g of basic aluminum chloride, 5.75 ml of a 1: 74% solution of refined sodium alkylarylsulfonate — PO-1D foam former 38-10789-76 is added. The amount of the mixture taken is brought to 100 ml with distilled water and poured into the beaker. The solution is stirred for 30 seconds with a stirrer speed of 4000 per minute. The stability of the foam is determined by the time it takes 50 ml of solution out of the resulting foam and is 64 minutes. For the comparative characteristics of the fire-extinguishing effectiveness of the compositions, an n-HepB burner with an area of 314 cm is filled with 630 ml of n-heptane as a fuel and ignited. Free burning time 180 s. Quenching is carried out with foam of a multiplicity of 100 from an aqueous solution containing, in wt%, sodium chloride, 1 basic aluminum chloride OXA and surfactant 0.11, based on a foaming agent (PO) PO-1D. The time of extinguishing is 6 s at a frother consumption in solution of 2 g / s. Data on fire extinguishing effectiveness of the compositions given in the free table. The value of the frothers is estimated according to the calculated balance cost and cost price) and components. The data in the table. show that by incorporating sodium chloride into the composition of sodium chloride

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the limit on the concentration of basic aluminum chloride can be lowered to 2 wt.%, which is 20 times lower relative to the prototype, and the lower limit to 0.5 wt.%, which is A times lower, is correspondingly. Reducing the upper concentration limit on the main, aluminum chloride c. , composition up to 2 wt.%, leads to a decrease in the concentration of surfactants89634

active substance 20 times, which helps to reduce environmental pollution. . at

Comparative data from the table also shows that the cost of the proposed blowing agent is 1.5 to 15 times lower than the cost of the composition of the prototype, which meets the purpose of the invention.

The rest is water. J / U. Replacement for sea salt - FS 42-883 / 74, gives similar results;

Claims (1)

_; FOAMING COMPOSITION FOR FIRE EXTINGUISHING FIRES, which includes a surfactant, basic aluminum chloride and water, which require that, in order to reduce the cost of the composition while maintaining the quality of the foam, it additionally contains sodium chloride in the following ratio of components, wt.%: Surface active substance 0.02-0.2 Basic aluminum chloride 0.5-2.0 Sodium Chloride 0.5-4.0 Water. Rest