Foam fire-extinguishing composition and preparation and use thereof
AssigneeDaikin Kogyo Co., Ltd.
InventorsIwao Hisamoto, Chiaki Maeda, Takasige Esaka, Mitsuhiro Nishiwaki
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Abstract
Use of a water-soluble high molecular compound which contains a fluoroalkyl group and a water-solubilizable group, having a molecular weight of not less than 5000 and a fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and of which the surface tension is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C., as an additive to a foam fire-extinguishing agent so as to improve and enhance the fire-extinguishing performances of the latter, particularly for the firing of polar organic solvents, is disclosed.
Claims8
A foam fire-extinguishing composition which comprises a foam fire-extinguishing agent selected from at least one member of the group consisting of a fluorine-containing surfactant, a synthetic surfactant containing no fluorine atom and a partially hydrolyzed protein-containing foaming agent and, as an additive, from 0.2 to 50% by weight based on said fire-extinguishing agent of a water-soluble high molecular compound having not less than several repeating units which contain a fluoroalkyl group and a water-solubilizable group, a molecular weight of not less than 5000 and a fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and of which the surface tension is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C.
A method for extinguishing a fire caused by organic polar solvents which comprises the application to said fire of a foam fire-extinguishing composition comprising a foam fire-extinguishing agent selected from at least one member of the group consisting of a fluorine-containing surfactant, a synthetic surfactant containing no fluorine atom and a partially hydrolyzed protein-containing foaming agent and, as an additive, from 0.2 to 50% by weight based on said fire-extinguishing agent of a water-soluble high molecular compound having not less than several repeating units which contain a fluoroalkyl group and a water-solubilizable group, has a molecular weight of not less than 5000 and a fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and of which the surface tension is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C.
In a method for enhancing the fire-extinguishing properties of a conventional foam fire-extinguishing agent the improvement which comprises incorporating into a foam fire-extinguishing agent selected from at least one member of the group consisting of a fluorine-containing surfactant, a synthetic surfactant containing no fluorine atom and a partially hydrolyzed protein-containing foaming agent, an additive having, from 0.2 to 50% by weight based on said fire-extinguishing agent of a water-soluble high molecular compounds having not less than several repeating units which contain a fluoroalkyl group and a water-solublilizable group, a molecular weight of not less than 5000 and a fluorine content of not less than 10% by weight and is soluble in water in an amount of at least 0.1% by weight at 25.degree. C. and of which the surface tension is not more than 50 dyn/cm when measured on 0.1 to 5.0% by weight aqueous solution at 25.degree. C.
Dependencies are inferred from the claim text.