JPS5841864B2 - fire extinguishing foam - Google Patents

Description

[Detailed description of the invention] The present invention relates to a synthetic surfactant-based fire extinguishing foam.

More specifically, the present invention relates to a fire extinguishing foam that has stable fire extinguishing power even when the outside temperature is high and even when fresh water or sea water is used as fire extinguishing water.

In recent years, large amounts of petroleum have been stored, increasing the risk of fire throughout the year.

Under these circumstances, there is a demand for a fire extinguishing foam that has stable extinguishing power throughout the year (especially in the summer).

On the other hand, because petroleum storage tanks are often installed on the coast, there is a demand for a fire extinguishing foam that has stable fire extinguishing power regardless of whether it is freshwater or seawater.

Protein-based foam fire extinguishing agents and synthetic surfactant-based foam fire extinguishing agents are known as conventional fire extinguishing foams, but protein-based fire extinguishing foams, for example, have a unique odor due to their nature. It is impossible to avoid spoilage during long-term storage, and it is necessary to replace it every 2 to 3 years.

On the other hand, as synthetic surfactant-based fire extinguishing foams, those containing higher alcohol sulfate salts and/or polyoxyethylene alkyl sulfate salts as foaming components or foaming reinforcing agents are mainly used. 48-1
．． 9037,%Kosho5234158).

However, these do not guarantee practical extinguishing power when the temperature (outside temperature) becomes high (for example, 30 to 40°C).

This phenomenon can occur regardless of whether freshwater or seawater is used as firefighting water.

The inventors of the present invention have conducted intensive studies on fire extinguishing foam that exhibits sufficient extinguishing power even when the temperature rises, and can be used as fire extinguishing water regardless of whether it is freshwater or seawater. The present invention has been achieved based on the discovery that the above sulfonate salt can be used in combination with a sulfuric acid ester salt type surfactant to achieve particularly excellent effects.

That is, the present invention provides a synthetic surfactant-based fire extinguishing foam (first invention) characterized by containing an alkyl-substituted arylether sulfonate A, and the sulfonate A and a sulfuric ester salt type surfactant. This is a synthetic surfactant-based fire extinguishing foam (second invention) characterized by containing B as a foaming component.

The alkyl-substituted arylether sulfonate A used in the present invention has the following general formula (1) [wherein R is an alkyl group, Ar is an aromatic nucleus, M is a cation, m, n
, x and y are integers of 0 to 2, provided that m+n is an integer of 1 or more, and x + y is an integer of 1 or more.

] Examples include compounds represented by:

In general formula (1), R is an alkyl group usually having 2 to 18 carbon atoms.

Examples include straight-chain and/or branched alkyl groups such as ethyl, hexyl, nonyl, dodecyl, and octadecyl.

Preferred is an alkyl group having 6 to 14 carbon atoms.

Examples of Ar include a benzene nucleus and/or a naphthalene nucleus.

Examples of M include an alkali gold layer, ammonium, and/or an alkanolamine cation.

Examples of alkali metals include sodium and potassium.

Further, examples of the alkanolamine include 7-no-, di-, triethanolamine, and propatoolamine.

Preferred M are sodium, potassium, ammonium, and ethanolamine cations.

When a plurality of R and/or M exist in general formula (1), they may be the same or different.

As the alkyl-substituted aryl ether sulfonate, monoalkyl diphenyl ether disulfonate (
For example, monotetradecyl diphenyl ether disulfonic acid sodium salt), monoalkyl diphenyl ether monosulfonate (such as monononyl diphenyl ether monosulfonic acid ammonium salt), dialkyl diphenyl ether disulfonate (eg didodecyl diphenyl ether disulfonic acid sodium salt).

Examples include monoalkyldiferether disulfonate (for example, monohexyldinaphthyl ether disulfonic acid jetanolamine salt), and mixtures of two or more thereof.

As the alkyl-substituted aryl ether sulfonate A, in addition to the above-mentioned alkyl-substituted diaryl ether sulfonic acid, alkyl-substituted aryl alkyl ether sulfonate represented by the following general formula (2), alkyl-substituted aryl aralkyl ether sulfonic acid I can give you salt.

[In the formula, R, Ar, and M are the same as in general formula (1), R/ is an alkyl group or an aralkyl group, m is an integer of 1 or more, and x and 7 are 1 or 2.

] In general formula (2), R' usually has 2 to 2 carbon atoms.
Examples include 18 alkyl groups, benzyl groups, and phenylethyl groups.

Two or more types of alkyl-substituted aryl ether sulfonate A may be used in combination.

Among the above A, preferred are the alkyl-substituted diaryl ether sulfonate represented by the general formula (1) and a mixture containing 50% of this by weight.

Further, the above A can be used alone as a foaming component of a fire extinguishing foam, but it can also be used in combination with other foaming agents (for example, those mentioned below).

In the second invention, examples of the sulfate salt type surfactant B used in combination with the sulfonate A include higher alcohol sulfate salt B1 and/or polyoxyethylene alkyl ether sulfate salt B2.

The above B1B2 has the following general formula (3), where R" is an alkyl group, p is O or an integer of 1 or more,
M' is a cation.

] Examples include compounds represented by:

In the general formula (3), R is a straight chain and/or branched alkyl group having usually 8 to 2 degrees of carbon atoms.

Examples include an off-thyl group, a decyl group, a tridecyl group, a hexadecyl group, an eicosyl group, and/or a mixed alkyl group thereof.

Preferred is an alkyl group having 10 to 16 carbon atoms.

M' may be an alkali metal, ammonium or alkanolamine cation.

Examples of alkali metals include sodium and potassium, and examples of alkanolamines that prescribe alkanolamine cations include mono-, di-, tri-ethanolamine, and propatoolamine.

p is usually 0 to 20, preferably 0 to 1O.

Here, if p is higher than 20 for dogs, sufficient foam stability cannot be obtained when the temperature is high (for example, 30° C. to 40° C.), and the extinguishing power is inferior.

Such compounds include natural alcohols (decyl alcohol, lauryl alcohol, myristyl alcohol,
cetyl alcohol, etc.): Synthetic alcohol [thicler alcohol, oxo alcohol (side chain alcohol content: 20~
70 weight φ; e.g. Shell Chemical's "Dopanol", Nichiro Kagaku's "Oxocol", Mitsubishi Kasei's "Diadol"), secondary alcohols (e.g. Union Carbide's "Tajitol S"), mixtures of these alcohols, and the like. Examples of sulfuric ester salts of ethylene oxide adducts include the following.

(B1): Decyl alcohol sulfate ester sodium salt.

Lauryl alcohol sulfate ammonium salt.

Cetyl alcohol sulfate sulfate triethanolamine salt, tridecyl alcohol sulfate ester sodium salt, oxo alcohol (C1l~17.side chain ratio so% or more) sulfate ester ammonium salt; (B2)' monooxyethylene decyl ether sulfate ester ammonium salt, Tetraoxyethylene lauryl ether sulfate sodium salt, octaoxyethylene cetyl ether sulfate triethanolamine salt, sulfate ammonium salt of Tergitol 15-8-9 (secondary alcohol ethylene oxide adduct manufactured by Uniten Carbide).

Two or more of the above B1 and/or B2 may be used in combination, for example, a combination of 812 or more types with different carbon numbers, 22 or more types of B with different carbon numbers and/or oxyethylene groups, or a combination of B1 and B2. can be given.

As the sulfate ester salt type surfactant B, the above B1. B
2 is preferred, but other sulfate salt type surfactants may be used in place of or in combination with B1fB2.

Other sulfate salt type surfactants include polyoxyethylene alkylaryl ether sulfates (e.g. polyoxyethylene nonylphenyl ether sulfates), polyoxypropylene- or polyoxyethylene/oxypropylene-alkyl-ether sulfates. Ester salts (for example, polyoxypropyleth lauryl ether sulfate ester salt), sulfate ester salts of higher fatty acid esters (for example, sulfate ester salts of coconut oil fatty acid monoglyceride).

Examples include sulfate ester salts of higher fatty acid alkylolamides (for example, coconut oil fatty acid monoethanolamide sulfate ester salts).

The cation of the above sulfate ester salt is an alkali metal (
ammonium or alkanolamines (sodium-potassium, etc.), ammonium or alkanolamines (sodium-potassium, di-triethanolamine,
Examples include cations (such as propatoolamine).

B1 of B. B2 and those containing 20 weight φ or more (particularly 35 weight φ or more) of these are preferable.

In addition to A and B, the foaming component in the present invention (first invention and second invention) can also contain another compound C.

Examples of such compounds include anionic surfactants other than A and B, nonionic surfactants, and fluorine surfactants.

Examples of anionic surfactants include sulfonate surfactants such as alkyl (C8-18) benzenesulfonates (dodecylbenzenesulfonates, etc.), alkyl (C8-18) benzenesulfonates (dodecylbenzenesulfonates, etc.),
8-18) Sulfonates (such as tetradecyl sulfonate), naphthalene- or alkylnaphthalene-sulfonates, sulforosuccinate salts (such as dihexyl sulfosuccinate salts), alkyl- or alkylbenzyl-benzimidazole sulfonates (Tokuko Showa 451
4360): Phosphorus-containing anionic surfactants such as heptano and/or di-alkyl phosphate ester salts, mono- and/or dialkyl ether or alkylaryl ether phosphate ester salts (GAFA
(C-type surfactants, etc.); carboxylate type surfactants such as soaps and alkyl ether carboxylates.

Counter ions (cations) of the above-mentioned anion activator include alkali metal, ammonium, and alkanolamine cations.

Examples of nonionic surfactants include polyoxyalkylene nonionic surfactants (e.g., polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene fatty acid ester). , ester surfactants (fatty acid esters of polyhydric alcohols such as glycerin and sorbitan),
Examples of fluorine-containing surfactants include fatty acid alkylolamides (nynol-type surfactants), such as fluoroalkyl group-containing surfactants such as carboxylic acid salts (CnF2n +
IC00M, H(C2F4)ncOOM, etc.], sulfonate (CnF2n+1503M, etc.) sulfonamide aliphatic acid salt (CnF2n + I S O2N(C2
H5) CH2C00M, etc.], carbonamide aliphatic acid salts [H(C2F4)nCON)ICH2C00M, etc.]
, phosphate (H(C2F4) nCH20PO3J
, (H(C2F4)ncH20)2PO,,M etc.]
can be given.

Among these, preferred are anionic surfactants (especially sulfonate type) and fluorine surfactants.

In the present invention (first invention and second invention), the amount of A used in the foaming component is determined based on the usage conditions of the foam extinguishing agent (temperature, water hardness, foaming ratio, foaming device, type of target fire, etc.). Depending on the performance, it can vary over a wide range, for example from 2% to 100% (based on the weight of the foaming component).

When fire extinguishing power at high temperatures is required, it is preferable to use 10% or more, especially 20% or more.

When used at low temperatures (when fire extinguishing power at high temperatures is not required), the diameter can be less than 10 mm, for example 2.5 to 6 φ.

When using seawater as fire extinguishing water, the water must be 50 or less, especially 4.
By using A, which is preferably 0φ or less, from 10 to 50φ, especially from 20 to 40φ, excellent foam stability can be achieved regardless of low or high temperatures, fresh water or seawater.
It can exhibit water retention properties.

In the second invention, B in the foaming component [especially B1 and/or
The usage amount of B2) can be varied over a wide range, for example, 20% to 98%, depending on the usage conditions and required performance, but a particularly excellent effect (low Demonstrates high foam stability and water retention regardless of temperature, high temperature, freshwater, or seawater.

The amount of A used may be the same as in the first invention.

A used as necessary in the foaming component in the first invention
The amount of compound C other than B used is usually 90 mm or less, preferably 80 mm or less.

In the second invention, the amount of Compound C used if necessary is usually 50 or less, preferably 30 or less.

[When using a sulfonate type surfactant as C, it is usually 50% or less, preferably 30% or less, and in the case of other anionic surfactants, it is usually 35% or less, preferably 20φ.
Below, in the case of a nonionic surfactant, it is usually 20 or less, preferably 10 or less, and in the case of a fluorine-based surfactant, it is usually 50 or less.
It is preferably 30% or less.

] In the foam fire extinguishing agent of the present invention, in addition to the foaming component,
Various commonly used additives can be blended.

Such additives include solvents as pour point depressants and viscosity depressants, foam stabilizers, and other additives.

The above solvents include glycols (ethylene glycol, diethylene glycol, tetraethylene glycol,
Flopylene glycol, dipropylene glycol, etc.)
; Polyols (glycerin, etc.); Alkyl (C1-6) ethers of glycols (ethylene glycol, di- or triethylene glycol, propylene glycol, etc.) or their esters (acetic acid esters, etc.) such as methyl cellosolve, ethyl cellosolve, butyl cellosolve , methylcarpitol, butylcarpitol, 1-butoxyethoxy-2-propatol cellosolve acetate, etc.); lower alcohols (impropatol, n-butanol, etc.).

Preferred solvents are ethyl cellosolve, butyl cellosolve,
Foam stabilizers such as butylcarpitol include higher alcohols having 10 to 18 carbon atoms (lauryl alcohol,
myristyl alcohol, oxo alcohol, etc.); water-soluble resins such as C0M, C0, PvAl methylcellulose.

Examples include hemicellulose, sodium alginate, sodium polyacrylate, polyvinylpyrrolidone, polyethylene glycol, water glass, and bentonite.

Other additives include pitting-like corrosion inhibitors and pH buffering agents (alkali metal salts of carboxylic or oxycarboxylic acids, such as sodium citrate, sodium acetate, sodium oxalate, etc.), and freshwater fire extinguishing agents (magnesium chloride). , aluminum chloride, etc.), solubilizing agents (urea, etc.),
Examples include fluidizing agents (ammonium sulfate, etc.).

The amount of these additives used may be the same as in conventional fire extinguishing agents, and an example of the composition of the foam fire extinguishing agent of the present invention, which is appropriately adopted depending on the conditions of use (extinguishing equipment, etc.), is as follows. be.

Foaming component: 15 to 30 weight (preferably 0 to [phase] weight φ) Solvent 10 to 40 weight φ (preferably [phase] to ■ weight) Foam stabilizer 2 to 7 weight (preferably @ to ■ weight) Other additives 0 to 10 weight items (preferably ■ to ■ weight weight) Water balance (remainder) The fire extinguishing foam of the present invention is usually added to fire extinguishing water at an appropriate concentration (for example, the concentration of the foaming component is 0). .2 to 3% by weight) and then diluted using the usual method, for example, the following (i) y (2), (3) t
It can be used by method (4): (1) The foam extinguishing agent is sucked into the water stream from just before the fire extinguishing device or foam nozzle as a stock solution, and air is introduced into the tube to stir and foam, while pouring it over a large area from the tip of the tube. How to radiate to.

(2) Mix fire extinguishing water and fire extinguishing foam, or mix them together on the way to the fire extinguishing device or foam nozzle, and then introduce air into the tube spear to foam and emit it over a large surface from the tip of the tube. Method.

(3) A method of mixing fire extinguishing water and fire extinguishing foam, or without mixing them, foaming them with a scale foam head so as to mix them from separate places and then discharging them to the fire scene.

(4) Mix fire extinguishing water and fire extinguishing foam, or mix them together from separate locations, spray this liquid onto a wire mesh, blow air from behind to create foam, and fire the fire. How to send foam to the site.

The fire extinguishing foam of the present invention has high foaming (foaming ratio: e.g. 1,0
00 to 500 times), medium foaming (for example, 500 to 20 times
It can be used for both foaming (for example, 20@ or less).

Fresh water (soft water), hard water, and sea water can also be used for fire extinguishing purposes.

The target fire can be applied to either A fire (general fire) or B fire (oil fire), but it is particularly effective against B fire (oil fire).

It can also be used for fires involving various combustible materials such as gasoline, kerosene, heavy oil, hydrocarbon solvents such as benzene and xylene, polar solvents such as alcohol, ether, ketones and esters, oils and fats, and plastics.

By containing alkyl-substituted aryl ether sulfonate A as a foaming component according to the present invention, a fire extinguishing foam having excellent fire extinguishing power even at high temperatures can be obtained.

In particular, by using the above A and the sulfuric ester salt type surfactant B together, the fire extinguishing foam of the present invention (second invention) exhibits the following effects.

1 Shows excellent fire extinguishing power even in summer (30°C to 40°C).

2 Even when seawater is used as fire extinguishing water, it exhibits excellent fire extinguishing power from low to high temperatures (-5°C to 40°C).

Because it exhibits the above effects, the foam fire extinguisher of the present invention can be used to prevent fires in oil tanks, gas stations, chemical factories, etc., fires in semi-closed structures such as buildings, tunnels, underground malls, etc., and especially fires in oil complexes near the coast. Suitable for ship fires.

Examples are shown below, but the present invention is not limited thereto.

Parts in Examples indicate parts by weight. Example 1 As a foaming component (A): 4.0 parts of monododecyl diphenyl ether disulfonic acid sodium salt (11.5 parts of monododecylbenzenesulfonic acid sodium salt) Polyoxyethylene alkyl ether with
2.5 parts polyoxyethylene nonyl ether with an average of 10 moles of oxyethylene groups 3.
Nibutylcarpitol as O part solvent 29.0
Polyvinylpyrrolidone with a two-part average molecular weight of 700,000 as a foam stabilizer 3.0 parts Polyethylene glycol with a two-part average molecular weight of 6,000
1.0 part water
A uniform fire extinguishing foam was prepared by blending and stirring to give a total weight of 39.0 parts.

Example 2 As foaming components: (A): 6.0 parts of a mixture of mono and dinonyl phenyl ether mono and disulfonic acid sodium salts (season: higher alcohol (average carbon number 12) sulfate ester ammonium salt 4.9 parts higher alcohol (Average carbon number 12) Sulfuric ester triethanolamine salt 2.1 parts Polyoxyethylene alkyl ether sulfate ammonium salt having an alkyl group with an average carbon number of 12 and an average of 3 moles of oxyethylene group
5.6 parts Polyoxyethylene alkyl ether sulfate triethanolamine salt having an alkyl group with an average of 12 carbon atoms and an average of 3 moles of oxyethylene groups 2.4 parts Nibutyl cellosolve as a solvent 23.0 parts As a foam stabilizer: Average Higher alcohol with 13 carbon atoms
3.0 parts water
A uniform fire extinguishing foam was prepared by blending and stirring to give a total weight of 53.0 parts.

Example 3 As a foaming component (A): Monohexyl dinaphthyl ether disulfonic acid monoethanolamine salt 5.0 parts Monohexyl phenyl nonyl ether monosulfonic acid monoethanolamine salt 4.0 parts Koriyama): Higher alcohol (average 10 carbon atoms) sulfate ester jetanolamine salt 8.5 parts Polyoxyethylene alkyl ether sulfate jetanolamine salt having an alkyl group with an average carbon number of 14 and an average of 7 moles of oxyethylene group 5.5 parts (0: nonyl 2.0 parts of benzenesulfonic acid ammonium salt Polyoxyethylene alkyl ether having an alkyl group with an average of 18 carbon atoms and an average of 10 moles of oxyethylene groups
1.0 parts Polyoxyethylene octylphenyl ether having an average of 12 moles of oxyethylene groups 1.5 parts Perfluorooctyl sulfonic acid sodium salt
0.5 parts As a solvent: Ethyl cellosolve 30.0 parts As a foam stabilizer: Polyethylene glycol with an average molecular weight of 6000 3.5
A homogeneous fire extinguishing foam was prepared by stirring and mixing.

Comparative Example 1 As a foaming component: Higher alcohol (with an average carbon number of 12) sulfate ester ammonium salt 6.9 parts Higher alcohol (with an average carbon number of 12) sulfate ester triethanolamine salt 2.9 parts Polyoxyethylene alkyl ether sulfate ammonium salt having an alkyl group and an average of 3 moles of oxyethylene groups 7
．． 8 parts Polyoxyethylene alkyl ether sulfate triethanolamine salt having an alkyl group with an average carbon number of 12 and an average of 3 moles of oxyethylene groups
3.4 parts Nibutyl cellosolve as solvent
23.0 parts As a foam stabilizer: Higher alcohol having an average carbon number of 13 3.0 parts Water 53.0 parts were mixed and stirred to prepare a uniform fire extinguishing foam.

Comparative Example 2 As a foaming component: Higher alcohol (with an average carbon number of 12) sulfate ester sodium salt 8.8 parts Higher alcohol (with an average carbon number of 16) sulfate ester sodium salt
2.8 parts polyoxyethylene alkyl ether sulfate sodium salt having an alkyl group with an average carbon number of 12 and an average of 5 moles of oxyethylene groups 13.7 parts an alkyl group with an average of 16 carbon atoms and an average of 5 moles of oxyethylene groups Polyoxyethylene alkyl ether sulfate ester sodium salt 4.7 parts Solvent: Isopropyl alcohol 3 o, o parts Foam stabilizer: Polyvinyl alcohol 2.0 parts Tetradecyl alcohol 2.0 parts Water
A uniform fire extinguishing foam was prepared by blending and stirring to give a total weight of 36.0 parts.

Performance Test 1 (Foaming Performance) The foaming performance of the foam fire extinguishing agent of the present invention and the foam fire extinguishing agent of the comparative example was measured in a constant temperature room at room temperature of 35°C and 20°C. A 6-hole nozzle was used that discharged the same amount of water.

For fire extinguishing water, use tap water as fresh water, 1.10 parts of magnesium chloride hexahydrate and 0.0 parts of calcium chloride dihydrate as seawater.
16 parts, sodium chloride 2.50 parts, sodium sulfate 0
．． Synthetic seawater with a composition of 40 parts water and 95.84 parts water was used.

The temperature of both tap water and synthetic seawater was adjusted to 20°C, and the concentration of the fire extinguishing foam was 1. It was used after being diluted to 0%.

The foam generated from the nozzle is collected in a container whose weight and volume have been measured in advance, and the foaming ratio is determined based on the weight and volume of the foam, and the weight of the liquid accumulated at the bottom of the container is 1/4 of the weight of the foam in the container. The water retention capacity of the foam was measured by the time it took to reach the target temperature.

The results are shown in Table 1.

As shown in Table 1, it can be seen that the fire extinguishing foam of the present invention has excellent foaming ratio and foam stability even at high temperatures, regardless of whether the fire extinguishing water is freshwater or seawater.

That is, the fire extinguishing foam of the present invention can be used when the outside temperature is high (for example, 30°C).
~40'C) and always produces a certain amount of foam regardless of the type of fire extinguishing water.Since the foam is stable, it can be expected that its extinguishing power will be stable and excellent.

Performance Test 2 (Extinguishing Power) The fire extinguishing power of the fire extinguishing foam of the present invention and the fire extinguishing foam of the comparative example was evaluated by the following method.

Implementation conditions 19 foamer: pressure cuff kg/cwt, discharge amount 10
1/min2, oil pan: 2.0mX2.0mX0.
3m3, fuel: n-hebutane 4.2. Water 3201 was put in the oil pan, and n-hebutane 2001 as fuel was put on top of it.

5. Concentration of fire extinguishing foam: 3.0 capacity Fire extinguishing guidelines 1. Pre-combustion 2. Free combustion was allowed for 1 minute after ignition.

2. Start of fire extinguishing 2 Foaming started 1 minute after ignition.

3. Foaming time 2 Foaming was continued for 8 minutes from the start of foaming.

The flame bubbles 7 minutes after the bubble stops. Close to the surface, combustion occurs 4. Sealing test: I tested whether.

5. Rekindling test: 20 minutes after the start of extinguishing, insert a 15 cTL square cylinder into the center of the bubbles in the oil pan, remove the foam inside the square cylinder to expose the fuel surface, ignite it, and fully The square tube that was confirmed to have burned was pulled out and the time after the tube was pulled out and the expansion of the combustion surface were observed.

In this evaluation of fire extinguishing power, fresh water (tap water) and sea water (synthetic sea water used when measuring foaming performance) were used as fire extinguishing water.

The temperatures of both freshwater and seawater were adjusted to 20°C.

The results obtained are shown in Table 2.

From these results, it is clear that the fire extinguishing foam of the present invention has extremely excellent fire extinguishing performance, with no fluctuation in extinguishing power depending on temperature and type of fire extinguishing water.

Claims (1)

[Scope of Claims] 1. A synthetic surfactant-based fire extinguishing foam characterized by containing an alkyl-substituted aryl ether sulfonate A as a foaming component. 2. The fire extinguishing foam according to claim 1, wherein the foaming component contains 10 to 50 parts by weight of φ. 3 A is a general formula [wherein R is an alkyl group having 2 to 18 carbon atoms, Ar is an aromatic nucleus, M is a cation, m, n, x, and is an integer of 0 to 2, however, m+n is 1 or more, and x+y is 1 or more. ] The fire extinguishing foam according to claim 1 or 2, which is a compound represented by: 4. A synthetic surfactant-based fire extinguishing foam characterized by containing an alkyl-substituted aryl ether sulfonate A and a sulfuric ester salt type surfactant B as foaming components. 5. The fire extinguishing foam according to claim 4, which contains 10 to 50 A by weight in the foaming component. 6. The fire extinguishing foam according to claim 4 or 5, which contains 50 to 90% by weight of B in the foaming component. 7. The fire extinguishing foam according to any one of claims 4 to 6, wherein B is a higher alcohol sulfate salt or/and a polyoxyethylene alkyl ether sulfate salt. 8 A is a general formula: [In the formula, R is an alkyl group having 2 to 18 carbon atoms, Ar is an aromatic nucleus, 1M is a cation, m, n, x and y are integers of 0 to 2, provided that m+n is 1 or more, x + y is 1 or more. The fire extinguishing foam according to claims 4 to 7, which is a compound represented by the formula: