SU874077A1 - Foam generator for fire-fighting - Google Patents

Description

(54) FOAM EXTINGUISHING FIRE

The invention relates to fire suppression, in particular, to the development of fire extinguishing foaming agents for extinguishing hydraulic fluids, which include lower alcohols, ketones, esters, etc. Foaming agents for extinguishing fires of hydrophilic liquids are known, which, along with a synthetic surfactant, contain additives that increase the resistance of foams to the action of ethyl alcohol, our composition based on synthetic surfactant-alkali metal, sodium alginate and dipowogram fl3 alcohol,

The disadvantage of this composition is the low resistance of foams on its oenove to the action of ethyl alcohol. In addition, in the process of storing the esa, the composite stratifies and prior mixing is required in order to make it ready, which reduces the efficiency of its use. A significant drawback of the composition is the impossibility of storing it in the form of a working solution obtained by diluting the original concentrator (bath composition: n), thus, the impossibility of using it in stationary installations of cooking.

A foaming agent for extinguishing hydrophilic fires is also known.

to liquids, including ethyl alcohol, including fluoride II ovaE {nye surfactant, silico-organic surfactant, thixotronic polysaccharide (scleroglutane), ia also other ingredients for various purposes (up to 15) and water. It forms a stable foam on the surface of ethyl alcohol fZ.

However, due to its multicomponent nature, it is difficult to prepare, doMozhi yo. One of the main components of these compositions is the no-dimensional compound, which, when removed from other components, forms a gelatinous composition. The high viscosity of these compounds protects them from delamination, but complicates the process of preparing their working solutions. The presence of a silica compound in the composition shortens the shelf life of the composition because it is susceptible to hydrolysis in an alkaline medium. Closest to the proposed composition is a foaming agent containing from 1 to 10% by weight of perfluorooxaalkylcarboxylic derivatives based on hexafluoropropylene oxide oligomers of the formula FC9PCF3.0) ciJFCONX4 CF, CF where a is 4-1-gz ;. X is a hydrogen atom; y - hydrophilic group,. and as a solvent of polysilox B 3-15 times the amount relative to the weight of the fluorocarbon surfactant. This composition is proposed to extinguish fires of polar solvents, including lower alcohols. However, testing the optimal of the proposed formulations showed insufficient foam stability on the surface of ethyl alcohol (2 minutes. The purpose of the invention is to increase foam stability to the action of ethyl alcohol. The goal is achieved by the fact that a foaming agent, including a derivative of perfluoroxy alkoxylcarboxylic acid based on hexafluoro propylene oxide, an organic solvent and water, as a derivative of verfluorooxaalkane lcarboxylic acid: based on hexafluoropropylene oxide co0, 8 O, and 1.0 2.0 16.0

five

100

80

3QO

780

630 7 A synergistic mixture of two salts of the general formula F (9FCF2V.pP-Cx СЧСЬ with and 7 and, Na or NHl) per luin ivrl J (1 As an organic solvent; ethyl alcohol, with the following content of components) wt.%: Salt of an example of an OHPP Salt of an octamer OHPP Ethyl Alcohol Else To obtain a homogeneous, clear solution of a frother, originally rastvor yut. salt of an octamer in an excess of ethyl alcohol, based on the fact that the subsequent mixing of it with an aqueous solution of the trime salt and the content of ethyl alcohol should not fall below the limit, ensuring the dissolution of the salt of the octamer OHPP in the water-alcohol mixture. The mixing process occurs at 1820 °. The table shows examples of the composition of the foaming agent and the stability of foams on the surface of ethyl alcohol obtained from 10% aqueous solutions of the composition. The test results show that the stability of the foams obtained from the proposed composition on ethyl alcohol is 2.5-7.0 times greater than that of the known composition. Hereinafter, for brevity, oligomeric acids with and 7 will be referred to as trimer and octamer, respectively.

30.0

35.0

K salt octamer

NH, octamer salt

.5 2,0 Na salt tri- K salt okmera tamer

Claims (3)

Claims I. Fire extinguishing agent, including production of & o) 1p1 perfluorooxa kilcarboiov1) 1x acids based on hexafluorpoopipene oxide OSA and a Formula 9 Organic CF dF cue solvent and water, characterized in that, in order to increase the stability of foams to the action of ethyl alcohol, as derivatives of perfluorooxyalkylcarboxylic acids, it contains a snoergic / mixture of these acids with (trimer); (octamer), and as a solvent - ethyl alcohol in the following ratio of components, wt.%: 38.0 pp exfoliates 35.0 pp exfoliates 750 4.0 4.0 800 Salt trimer 1,0-30,0 Salt octame 1,0-16,0 Ethyl alcohol 2,0-35,0 Water Rest 2. Foam-formation according to p. I, differing from the fact that as salts of perfluoroxaphenylcarboxylic acids based on hexaforg propipene oxide it contains sodium, potassium or ammonium salts. Sources of information taken about the attention in the examination of J, USSR Copyright Certificate 267346, cl. A62 D 1/00, published. 1977. 2. US patent 4060489, cl. 252-3, pub. 1977. 3. Patent of Germany 1812531, cl. 61 b 2 pub. 1970.