SU965434A1 - Foam former for fire extinguishing - Google Patents

Description

(Sk) FOAMER FOR FIRE EXTINGUISHING

one .

This invention relates to froth agents for extinguishing water-soluble flammable liquids, including alcohols.

Foaming compositions are known for the traction of fires of water-soluble flammable liquids based on anionic synthetic surface-active substances (surfactants) with the addition of natural high-molecular compounds — alginic acid salts 1 J

These compounds are recommended for extinguishing fires of ethyl alcohol, but due to the lack of stability and the need to pre-dilute the flammable liquid, the effectiveness of such compositions is unsatisfactory. In addition, solutions with additives of alginate salts are stratified during storage, which makes them unsuitable for automatic fire extinguishing systems. Working solutions of these blowing agents quickly lose their properties over time.

An effective composition for extinguishing fires of polar liquids, obtained on the basis of synthetic surfactants with additions of organosilicon, perfluorinated surfactants and polymeric compound (usually a thixotropic polysaccharide) 2, is also known.

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The disadvantages of this composition include its complexity; It contains an average of 6-20 ingredients. They are difficult to prepare and expensive. The polymeric compound contained in the foaming agent forms, when mixed with other components, a gel-like gelatinous composition, which prevents the composition from delaminating, but significantly complicates the process of preparing working solutions and prevents its dosing on the existing fire fighting equipment. In addition, a certain amount of time is needed to dissolve these compositions, which reduces their operability in extinguishing fires. The closest to that proposed for the components used and the effect achieved is the composition in which the weight is contained. %: Alkylaryl sulphonates sodium 25-30 Polyacrylic acid salt 2-6 Perforated surfactant 1, Water Remaining It is proposed to use its sodium, potassium, ammonium, mono- and diethanolamine salt as the salt of polyacrylic acid, and the same salts of polymethacrylic acid 3 However, this The composition has an insufficiently high resistance to the action of ethyl alcohol. The purpose of the invention is to increase the stability of foams to the action of ethyl alcohol. This goal is achieved by the fact that a blowing agent for carcass fires containing sodium alkylarylsulfonates, perfluorinated surfactants, polyacrylic acid derivatives and water, contains sodium methacrylate copolymer with butyl methacrylate as a polyacrylic acid derivative with the following content, wt. % Alkylaryl sulfonates Sodium perfluorinated surfactant 1, Sodium methacrylate copolymer with butyl methacrylate 0, 5-6 Water Remains

Table 1 244 As a perfluorinated surfactant in the proposed composition, as well as in the composition of the prototype, use the compound under the code name FOP of the following structure: / (CH3) CgF CONHCjHg-Nr sn, sn, it is prepared. sodium (RAS) with a pre-neutralized 15-20% aqueous solution of a copolymer of methacrylic acid with butyl methacrylate and a 20% aqueous solution of perfluorinated surfactant (FOP) in accordance with the recipe. Comparative test results of the proposed composition and prototype are presented in table. and 2. In table. Figure 1 shows the stability values of the foams on the surface of ethyl alcohol. Foams are obtained from water solutions of frothers. A 50 ml foam is applied to ethyl alcohol, 50 ml of which is poured into a 7 cm beaker. 2 shows the values of the stability of foams on the surface of ethyl alcohol obtained from aqueous solutions of the proposed formulations and the prototype depending on the concentration of the polymer additive (at a constant concentration of PAC and FOP, respectively 30 and 4 wt.%} The obtained results show that the proposed composition will significantly more resistant foams on the surface of ethyl alcohol (in ZZ) than the composition of the prototype.

25 30 35

i.iit, O 6.0

MAC - sodium methacrylate copolymer with butyl methacrylate;

 PAK - sodium salt of polyacrylic acid.

Table continuation

stratified during storage

-X

0.5

0.5 AK .0 10.0 6.0

The solution is stratified during storage

Claims (3)

TABLE 2 Formula of Invention Fire Extinguishing Agent, including sodium alkylaryl sulfonates, perfluorinated surfactant, polyacrylic acid derivative, and water, characterized in that it contains a copolymer to increase the foam's resistance to the action of ethyl alcohol. sodium methamrylate with butyl methacrylate in the following ratio of components, wt. %: Alkylaryl sulfonates sodium 25.0-35.0 36Sk3k pr cl of cl, 8 Perfluorinated surfactant 1.5-6.0 Sodium methacrylate copolymer with butyl methacrylate 0.5-6.0 waterExtra Information sources taken into account in examination 1. US patent number 252-8.05, published. 1958. 2. US patent number U060 89, 252-3, published. 1977. 3. Author's certificate of the USSR and VC No. 2999334/26, A 62 D 1/02, 1980.