KR20090075445A - Excellent hi-conc. extinguishing foam when used on oil fires - Google Patents

Abstract

A high concentration form fire extinguishing agent is provided, which is environment-friendly and maximizes the foaming power and fire extinguishing performance by controlling the surface tension. A high concentration form fire extinguishing agent comprises: non-ionic surfactant alkylpolyglucoside 25 weight%; ampholytic surfactant alkyl propyl betaine 15 weight%; nature surfactant lanolin 2~3 weight%; fluorosurfactant 5~6 weight%; anticorrosive agent 3 weight%; and water 48~50 weight%.

Description

Highly concentrated foam fire extinguishing agent excellent for suppressing oil fires {Excellent Hi-Conc. extinguishing Foam when used on Oil fires}

The present invention relates to a foam fire extinguishing agent exhibiting excellent performance in suppressing oil fires, which is an environmentally friendly and biodegradable nonionic surfactant alkyl polyglucoside, amphoteric surfactant cocoamide propyl betane, natural surfactant Highly concentrated foam fire extinguishing agent which is excellent in extinguishing power and eco-friendly oil fire suppression even at low concentration by adding lanolin, lecithin, saponin, and adding small amount of fluorine-based surfactant to maximize surface foam by controlling surface tension. will be.

In general, fires are classified into Class A fire, Class B fire, and Class C fire, which can be subdivided into Class D containing magnesium. A fire extinguishing material is useful to extinguish the combustible material by cooling down to below the ignition point with a fire extinguisher, mainly by wood or paper. Class B fires are petroleum or oil fires in which carbon dioxide (CO2), halon and foam fire extinguishers are used. On the other hand, the C fire extinguisher is the most efficient method of extinguishing the oxygen fired by CO2 as an electric fire, and the fire extinguishing method by powder fire extinguisher (ABC powder) is useful.

There are many kinds of materials used as fire extinguishing agents, but water has been used most as a fire extinguishing agent because its price is low, there is no fear of deterioration, and it is harmless to the human body. In particular, water has a high specific heat (1kcal / kg · ℃) and absorbs a large amount of heat, and due to the large latent heat of evaporation (539kcal / kg), a large amount of heat is taken away from the surroundings to cool the combustibles, and the expansion rate of vaporization (1,650 times) It is said that this large water vapor covers the combustion surface and the suffocation effect is large. However, when water alone is used as a fire extinguishing agent, the freezing point of water may be frozen at 0 ° C. or lower and 0 ° C., thereby causing the pipe to be damaged and causing a problem of corrosion. In order to improve the disadvantages of water, a fire extinguishing agent has been developed in which a surfactant is added to enhance the penetration of water and an antifreeze is added to lower the freezing point. Representatively, it can be divided into reinforcement extinguishing agent and phosphoric drug. Reinforcing liquid extinguishing agent is extinguishing agent and freezing point lowered below -20 ℃ by adding small amount of surfactant and inorganic salt to water. Inorganic salts used in reinforcing liquid extinguishing agents are mainly potassium carbonate and ammonium phosphate, which are yellow or colorless viscous aqueous solution. . Initially developed reinforcing liquid extinguishing agent was alkaline ion solution with hydrogen ion concentration, that is, pH 11 ~ 12, which had great problems of corrosion and safety of container before and after use, and mainly suitable for Class A fire. However, since the developed extinguishing agent extinguishing agent has been developed to strengthen the extinguishing agent having a pH in the neutral range, Class A as well as fire extinguishing agent.

On the other hand, a foaming agent is a fire extinguishing agent that mixes a few additives with water and injects air thereto to generate foam. The resulting foam is a collection of fine bubbles that are lighter than oil, covering the surface of the combustion product, blocking contact with air, resulting in a suffocation effect and cooling effect by the water used together. In other words, the fire extinguishing agent fights fires by the choking effect and the cooling effect. There are two types of fabric guns (also referred to as air guns), in which air is the nucleus by stirring and mixing air with carbon dioxide as a nucleus, and an aqueous solution of air and air as a nucleus. The former is not currently used and generally means the latter machine gun. Fire extinguishing agents are most effective for extinguishing oil fires because they can choke on the surface of oil, but can also be used for general fires. In general, water alone is used for extinguishing flammable liquids that have a weak fire extinguishing effect or may be extended by fire. Among foaming agents, mechanofoams are protein forming agents, fluoroprotein foaming agents, synthetic foaming agents, and aqueous film foaming agents. ) And alcohol-resistant foaming agents.

Protein digestive agents hydrolyze animal blood, horns and toenails, which are animal proteins, into alkalis (sodium hydroxide, calcium hydroxide), resulting in amino acids. In the middle of the process, discontinuation of the decomposition is the main ingredient of this extinguishing agent is a sticky liquid extinguishing liquid with a peculiar smell of dark brown color. The fluorinated protein fire extinguishing agent supplements the shortcomings of the protein cloth and the aqueous membrane cloth by adding a fluorine-based surfactant to the protein fire extinguishing agent, and has poor fluidity and flame resistance. The disadvantages of the fabric and the weakness of the aqueous membrane fabric on the tank wall where the aqueous membrane formed on the surface is improved. Synthetic surfactant foam fire extinguishing agent is a chemical agent that is added a stabilizer, an antifreeze agent, a rust preventive agent and the like to the same kind of surfactant as the main component of the synthetic detergent. Because of its good fluidity and poor heat and oil containment, it is not very effective for fixed fire extinguishing systems, such as storage tanks of flammable liquid dangerous goods. Compared to the protein fire extinguishing agent, the storage stability is very good, but the synthetic surfactants are not easily decomposed, which causes environmental problems such as tax breaks. Water-based film fire extinguishing agent is based on fluorine-based surfactants and is also mixed with water. Aqueous membranes are liquids that form synthetic foam and can be used with normal water as well as seawater.

It is a groundbreaking drug that mixes with water at an appropriate ratio and discharges it to the existing bubble outlet so that the water floats on a flammable liquid that is lighter than water. It is excellent in choking and cooling because it forms a foam and an aqueous film on the surface of the oil. Representatively, a lot of products of 3M's Light Water brand are sold, and this is because the aqueous film formed on the oil surface appears to be lighter than oil. Alcohol-resistant foaming agents are also known as foaming agents for water-soluble liquids and are effective for fires of flammable water-soluble liquids such as alcohols, ethers, ketones, esters, aldehydes, carboxylic acids, and amines.

In order to improve the performance of the above-mentioned reinforcing liquid extinguishing agent and foaming agent, a surfactant is used. Surfactant (Surface Active Agent, Surfactant) is adsorbed to the interface to lower the free energy of the interface and significantly change the properties of the interface. It is a substance. In other words, when the interface between the two is not formed from each other, such as water and oil, and the interface between them is reliably formed, it is called surface inertness in terms of interfacial chemistry. It becomes a mixed emulsion and changes to one state. Surfactants are materials that help the body digest oils, such as coal and oil fuels and bile. As a chemical structure, it is a biphilic substance having both hydrophilic group having water affinity and water and lipophilic group having oil affinity in one molecule. It is used as laundry detergent, softener, etc. It is used in various industrial fields such as chemicals, pharmaceuticals and lubricants. The action of surfactant has various functions depending on its structure such as emulsification, solubilization, dispersion, cleaning, defoaming, bubble, antistatic, moisturizing, sterilization, lubrication, etc. It can be classified by chemical structure, performance, use, etc. The most common classification method is categorized into cationic, anionic, zwitterionic, and nonionic surfactants according to the ionic properties dissociated when the surfactant is dissolved in water. In the case of surfactants used in synthetic detergents, when the concentration is 1ppm or more, bubbles are formed to form a film on the surface of the blister.The film blocks the sunlight and oxygen supply, reducing the self-cleaning ability of the water itself and various toxicity to aquatic organisms. It is a serious problem of water pollution. As an alternative to detergent pollution, the world has converted rigid ABS into biodegradable soft ABS (LAS) from the 1960s to early 1970s. Currently, environmentally friendly products that can minimize water pollution due to their excellent biodegradability, physical properties such as wetting, foaming, cleaning, and surface tension resistance of existing surfactants with little irritation to living organisms Excellent surfactants are required and used. For example, in the case of a synthetic surfactant, a product prepared by using natural fats such as palm oil or coconut oil as raw materials rather than petroleum paraffin raw materials, and a polymer interface using raw materials such as cellulose, sucrose, aminoic acid, and polymers. Synthetic products using new catalysts such as activators and enzymes are mainly used, and protein-based biosurfactants with high stability to living organisms and the environment, and surfactants using microorganisms and natural extracts are widely used. It is an environmentally friendly surfactant.

Biosurfactants are surfactants produced by microorganisms and bacteria that consume hydrocarbons or glucose and grow, and have the ability to lower the surface tension and interfacial tension of different systems. Biosurfactants have been applied to glycolipids, fatty acids, lipoamino acids, peptide lipids, phospholipids, bile acids, saponins, and the like.

Looking at the prior art of the extinguishing agent prepared using a small amount of inorganic salts or surfactants in water as an additive, first, the prior art related to the reinforcing liquid extinguishing agent

Korean Patent Laid-Open Publication No. 1998-013748 discloses 33 to 37% by weight of urea (CO (NH ₂ ) ₂ ), 13 to 17% by weight of sulfuric acid (K ₂ SO ₄ ), and a silver ion activator to aid surface adhesion (ANIOM SURFACTANTS) 0.3-0.7% by weight, 11.5-15.5% by weight aqueous potassium carbonate, 0.3-0.7% by weight sodium monophosphate (P ₂ O ₆ ) and 33-37% by weight ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] After the addition of 0.3 to 0.7% by weight of alum, a method for preparing a neutral reinforcing liquid extinguishing agent is described.

In Publication No. 10-2004-0056142, cooking oil fire neutral prepared with distilled water 54wt%, aluminum sulfate 20wt%, nonionic surfactant 1wt%, monoethylene glycol (MEG) or polypropylene glycol (PPG) 25wt%, etc. System reinforcing liquid digestive liquid and a method for preparing the same are described,

Korean Patent Publication No. 10-2003-0087381 discloses the extinguishing component ammonium sulfate, urea, sodium triphosphate, sodium hydrogen carbonate, ammonium phosphate, potassium sulfate 100wt%, potassium carbonate 20-200wt%, surfactant 0.1-50wt%, freezing It is known a method for producing a neutral reinforcing liquid extinguishing agent composition prepared by 5-100 wt% of an inhibitor,

Korean Patent Publication No. 10-2006-69626 discloses a reinforcing liquid extinguishing agent composition consisting of a fire extinguishing component, a liquid sodium silicate, a surfactant, an icing agent, and water, and a method of manufacturing the same.

Korean Patent Publication No. 10-2004-16398 discloses at least one compound selected from the group consisting of alkali carbonates and alkali carbonates which are pyrolyzed to produce carbon dioxide and alkali carbonates, and metal oxides that react with alkali carbonates to produce carbon monoxide. Extinguishing agents comprising hydrophobic binders which are assembled by bonding are described,

Publication No. 10-2004-78078 discloses a reinforcing liquid extinguishing agent composition composed of distilled water, aluminum sulfate, nonionic surfactant, monoethylene glycol or polypropylene glycol,

Publication No. 10-2005-67382 discloses a composition comprising at least one or a mixture of water, alkali, citric anhydride, citric acid, acetic acid or related salts thereof, and wherein the composition comprises acetate, bicarbonate, carbonate and / or Or alkali metal salts or compounds from at least one of the hydroxide anions and at least one of the lithium, sodium and / or potassium cations, as well as fire retardants comprising phosphates and methods for preparing the same,

Publication No. 10-2003-62707 discloses an extinguishing component comprising one or more inorganic compounds selected from the group consisting of ammonium sulfate, urea, sodium triphosphate, ammonium bicarbonate, sodium carbonate, ammonium phosphate and potassium sulfate, Neutral reinforcing liquid extinguishing agent for environmentally friendly general fires containing organic acid and surfactant water is described.

Publication No. 1995-803 discloses an aqueous solution of ammonium bicarbonate and water sodium phosphate, an aqueous solution of urea, ammonium sulfate and sodium carbonate in water, and an aqueous solution of calcium chloride in alumina sulfate and aluminum sulfate. A method for preparing a liquid extinguishing agent prepared by mixing is disclosed.

On the other hand, if you look at the prior art related to the fire extinguishing agent

Publication No. 1980-1203 discloses the composition of a foam fire extinguishing agent for a hydrophilic flammable liquid based on dextrin.

Publication No. 10-1982-0001428 discloses a technique for suppressing the generation of harmful gases by using carbon dioxide gas in a hydrolyzed protein cloth.

Publication No. 10-2006-0077831 discloses 3 to 20% by weight of alkyl acid phosphate, 5 to 15% by weight of ammonium sulfamate, 10 to 25% by weight of urea, 5 to 15% by weight of a glycol-based surfactant. 03.0-0. 1 weight%, fluorine-type surfactant 0.05-0. An aqueous fire extinguishing agent comprising 4% by weight of a foamable aqueous solution containing ammonia water for pH adjustment is described.

Conventional techniques as described above are in a state in which there is no detailed description except that the inorganic salts or surfactants are simply used as additives in water to exhibit a slight effect on digestive power.

It is an eco-friendly product with excellent biodegradability, maximizes foaming and extinguishing performance by controlling surface tension, has excellent freezing point and rust resistance, and in particular, develops low-density foam fire extinguishing agent that shows excellent extinguishing performance for oil fire. The invention is to be solved.

In order to solve the above problems, the present invention is an environmentally friendly and biodegradable nonionic surfactant alkyl polyglucoside, amphoteric surfactant cocoamide propyl betanin and natural surfactant lanolin, lecithin, and saponin components are formulated It is used as a component and a small amount of fluorine-based surfactant is added to control surface tension to maximize foaming and extinguishing performance, and to adjust the freezing point by adding a passivating agent, and to add a corrosion inhibitor excellent in rust resistance to the material, acetic acid As a foam fire extinguishing agent prepared by adjusting the pH of the foam fire extinguishing agent, it is to provide a foam fire extinguishing agent excellent in oil fire extinguishing is a means for solving the problem of the present invention.

The present invention as described above is a foam fire extinguishing agent capable of effectively extinguishing oil fires, compared to the existing fire extinguishing agents, using environmentally friendly and natural surfactants to reduce environmental pollution, and also because it is a highly concentrated fire extinguishing agent for minimizing the amount of use. It is effective in reducing storage space and reducing costs.

In order to achieve the above object, the foam fire extinguishing agent composition of the present invention is: (a) nonionic surfactant: 20 to 30% by weight;

(b) amphoteric surfactant: 10-20% by weight;

(c) natural surfactant: 1 to 5% by weight;

(d) Fluorine-type surfactant: 5-10 weight%;

(e) corrosion inhibitor: 3-5% by weight;

(f) Water: Consists of balance.

The nonionic surfactant used in the present invention uses any one compound of fatty acid cocoyl amide, alkylpolyalkylene glycol, alkyldimethylamine oxide, alkylpolyglucoside, the alkyl group has 8 to 14 carbon atoms, Most preferably, having 12 to 14 carbon atoms is the most excellent foaming force.

In the present invention, the alkylpolyglucoside has the most excellent foaming ability.

Alkylpolyglucoside is a surfactant that has been sold under the trade name "APG" by Henkel, Inc., and has a low interfacial tension and excellent bubble performance when used with other surfactants. In the present invention, the mixture content of the alkylpolyglucoside is preferably 20-30% by weight, most preferably 25% by weight.

The amphoteric surfactant of the present invention uses a compound of any one of alkyl dimethyl betaine, alkyl propyl betaine, alkyl ampoacetate, the alkyl group has 8 to 14 carbon atoms, most preferably 12 to 14 carbon atoms It was found that having the best foaming force.

The amphoteric surfactants used in the present invention showed that the foaming power was remarkably increased when the alkylproyl betaine was used in combination with the alkyl polyglucoside, which is the non-ionic surfactant, as the most environmentally friendly surfactant. As for the mixture content of the above-mentioned amphoteric surfactant alkylpropyl betanein, 10-20 weight% is used, Most preferably, it is 15 weight%.

The natural surfactant used in the present invention uses a compound of any one of lanolin, lecithin, and saponin, lanolin is from soybean, lecithin from egg yolk or soybean, saponin is extracted from soybean, ginseng, hemp, etc. If a certain amount is added to the blending component of the above-described nonionic surfactant and amphoteric surfactant as a component, a large amount of small bubbles are generated to play a role in making the overall foaming force rich. In the present invention, the mixture content of the natural surfactant is suitably 1 to 5% by weight, more preferably 2 to 3% by weight.

Fluorine-based surfactants used in the present invention are prepared by substituting a water-soluble functional group at the end of a hydrophobic linear molecule containing a fluorine atom and is the most excellent surface tension resistance among the existing surfactants. Recently, it contains a per-fluoro oligomeric amphoteric surfactant containing trimethylammonium salt, and has various kinds of surfactants including nonionic, amido or imidazoline substituents added with EO (Ethylene Oxide). Compounds have been developed and commercialized. In particular, fluorine-based surfactants exhibit a lower surface tension than silicones, and are highly functional surfactants having excellent repulsion against water and oil and good chemical resistance. It is a relatively expensive product, but it is used as an additive, emulsifier, dispersant, etc. due to its excellent surface activity effect on organic solvents. The maximum surface tension value that can be lowered by using a general hydrocarbon surfactant is about 25 dyne / cm, whereas the surface tension value can be lowered by about 20 dyne / cm in the case of fluorine-based surfactants. In the present invention, PolyFox AT-112 produced by OMNOVA, Inc., USA was used, and the amount used in the mixture was about 5-10 wt%, and the most preferred amount was 5-6 wt%.

Corrosion inhibitors used in the present invention are corrosion inhibitors such as "Ferric Orthophosphate and Sodium Silicate" in the patent application No. 10-2006-0118842 filed by the present applicant "neutral reinforcing liquid extinguishing agent with corrosion inhibitor" silicate) "was used in a 1: 1 to weight ratio, 3 to 5% by weight of the corrosion inhibitor content is appropriate, the use of 3% by weight of the corrosion inhibitory effect was very excellent.

In addition, conventional additives such as pH adjusters, preservatives, dyes and flavors are used as the composition of the present invention, it is possible to mix the appropriate amount in a range that does not impair the effects of the present invention.

 TABLE 1

ingredient weight( wt %) An appropriate amount ( wt %) Nonionic surfactant 20-30% by weight  25% by weight Amphoteric surfactants  10-20 wt% 15 wt% Natural surfactants 1 to 5 wt%  2-3 wt% Fluorinated Surfactant  5-10% by weight 5-6% by weight Corrosion inhibitor  3-5 wt% 3 wt% water Balance Balance

[Table 1] is a table showing the range of foam fire extinguishing agent composition components were prepared in the foam fire extinguishing agent in the range of [Table 1].

Hereinafter, preferred embodiments will be described in order to describe the present invention in detail, and the present invention is not limited to the examples.

Examples 1-15

Nonionic surfactant alkyl polyglucoside 25kg, amphoteric surfactant alkylpropylbetaine 15kg, natural surfactant lanolin 2 ~ 3kg, fluorine surfactant 5 ~ 6kg, corrosion inhibitor 3kg, water 48 ~ 50kg mixed as shown in Table 2 A highly concentrated foam fire extinguishing agent excellent for suppressing oil fires was prepared.

TABLE 2

Example division One 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Nonionic Surfactant [kg] Fatty acid cocoyl amide 30 - - - - - - - - - - - - - - Alkylpolyalkylene glycol - 30 - - - - - - - - - - - - - Alkyldimethylamine oxide - - 30 - - - - - - - - - - - - Alkylpolyglucoside - - - 30 30 30 30 30 20 25 25 25 25 25 25 Amphoteric Surfactant [kg] Alkyldimethylbetaine 20 20 20 20 - - - - - - - - - - - Alkylpropylbetaine - - - - 20 - 20 20 20 15 10 15 15 15 15 Alkyl Ampoacetate - - - - - 20 - - - - - - - - - Natural Surfactants [kg] lanolin 5 5 5 5 5 5 - - 5 5 5 3 One 3 3 lecithin - - - - - - 5 - - - - - - - - Saponins - - - - - - - 5 - - - - - - - Fluorine-based Surfactant [kg] PolyFox AT-112 5 5 5 5 5 5 5 5 5 5 5 5 5 6 7 Corrosion Inhibitor [kg] 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Water [kg] 37 37 37 37 37 37 37 37 47 47 47 48 51 48 47 Corrosion test (3mg / 20cm ^{2 ·} day) - - - - - - - - - - - 0.12 - 0.13 - Surface tension (dyne / cm) 27 26 26 25 24 25 24 23 26 22 23 21 22 21 21 Foam magnification (times) 5.2 5.5 5.4 5.6 5.6 5.5 5.4 5.2 5.3 5.6 5.3 5.8 5.5 5.8 5.7

Experimental Example

Performance evaluation of the foam fire extinguishing agent prepared in Examples [1] to [14] is used by diluting the foam fire extinguishing agent with 1 wt% to 99 wt% of water. The properties and performance tests of the foam fire extinguishing agent were evaluated in accordance with the Korea Fire Protection Corporation's Type Approval and Certification Standards and Test Rules (hereinafter referred to as "KOFEIS 0103").

① Corrosion test

: KOFEIS 0103 Article 11 (Weight Loss Due to Corrosion of Steel, etc.)

If the specimen is immersed in steel, ecliptic and aluminum in the saline solution and the solution temperature is maintained at 38 ± 2 ℃ for 21 days, the weight loss should not be more than 3mg / 20cm ² per day.

② bubble power

: Article 12 (Foaming Performance) of KOFEIS 0103

When a catcher solution at 20 ± 2 ° C is used to generate bubbles (hereinafter referred to as “foaming”) using a standard foam nozzle as shown in Table 1 under a water pressure of 0.7 MPa (7 kg / cm 2) and a waterproof amount of 10 L per minute. The expansion rate of the bubble (the ratio between the volume of the aqueous solution and the volume of the bubble generated) is equal to or greater than 5, and the time required for the catchment solution, which is 25% of the volume of the aqueous solution before foaming, to be reduced from the foam, is 1 Must be at least minutes.

③ Digestive performance

: KOFEIS 0103 Article 13 (Fire Extinguishing Performance)

Fire extinguishing performance of foam fire extinguishing agent shall comply with the following subparagraphs when a catcher solution containing 20 L of water and 200 L of N-heptane is lit for 5 minutes after 20 min 2 ° C of fire.

1. The time required for digestion should be within 5 minutes.

2. If the flame closes to the foam surface by igniter for 15 minutes after finishing foaming, it should not be burned again.

3. After 15 minutes of foaming, the oil surface is exposed to a square with a length of 15cm on one side at the center of the foam surface, and it is lit again and burned for 5 minutes.

 [Table 3] Digestion performance test

Extinguishing agent Example 12 Example 14 Comparative Example 1 Comparative Example 2 Korea Fire Protection Standard water Freshwater Freshwater Freshwater Freshwater Freshwater fuel N-heptane N-heptane N-heptane N-heptane N-heptane Preheating time 1 minute 1 minute 1 minute 1 minute 1 minute Battling time 26 seconds 26 seconds 28 36 - Digestion time 1 minute 15 seconds 1 minute 12 seconds 1 minute, 20 seconds 1 minute 36 seconds Within 5 minutes Sealing castle Very good Very good Good Good - Remarks Use 1% diluent Use 1% diluent Domestic type fire extinguishing agent [using 3% diluent] Overseas Type Fill Extinguishing Agent [Use 3% diluent] -

[Table 3] shows the performance evaluation for the embodiment of the present invention. In the present invention, the foam fire extinguishing agent in the present invention meets the domestic fire extinguishing standard and is excellent even when compared with the extinguishing agent in Korea and abroad. It has been shown to have digestive performance.

Claims (8)

Highly concentrated foam fire extinguishing agent excellent for suppressing oil fire, 25% by weight of nonionic surfactant alkylpolyglucoside, 15% by weight of amphoteric surfactant alkylpropylbetaine, 2 to 3% by weight of natural surfactant lanolin, 5 to 6% by weight of fluorinated surfactant, 3% by weight of corrosion inhibitor, water Highly concentrated foam fire extinguishing agent excellent for extinguishing oil fire, characterized by being composed of 48 to 50% by weight. The method of claim 1, wherein the nonionic surfactant is any one of fatty acid cocoyl amide, alkyl polyalkylene glycol, alkyl dimethylamine oxide, alkyl polyglucoside, and the alkyl group is characterized in that 8 to 14 carbon atoms Highly concentrated foam fire extinguishing agent excellent for extinguishing oil fire. The highly concentrated foam according to claim 2, wherein the nonionic surfactant fatty acid cocoyl amide, alkylpolyalkylene glycol, alkyldimethylamine oxide, alkyl polyglucoside alkyl group has 12 to 14 carbon atoms. Extinguishing agent. The method of claim 1, wherein the amphoteric surfactant is any compound of alkyl dimethyl beta, alkyl propyl betaine, alkyl ampoacetate, alkyl group is excellent in suppressing oil fires, characterized in that 8 to 14 carbon atoms. Highly concentrated foam fire extinguishing agent. The highly concentrated foam fire extinguishing agent of claim 4, wherein the alkyl groups of the alkyl dimethyl betaine, the alkyl propyl betaine, and the alkyl ampoacetate of the amphoteric surfactant are 12 to 14 carbon atoms. The high concentration foam extinguishing agent of claim 1, wherein the natural surfactant is a compound of any one of lanolin, lecithin, and saponin. The high concentration foam extinguishing agent of claim 1, wherein the fluorine-based surfactant is PolyFox AT-112. The method of claim 1, wherein the corrosion inhibitor is a highly concentrated foam fire extinguishing agent excellent in suppressing oil fires, characterized in that the ferric orthophosphate and sodium silicate is mixed 1: 1 by weight.