JPS5846968A - Fire fighting concentrated liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concentrated fire extinguishing liquid. For more details, see heavy oil,
Petroleum-based water-insoluble liquids such as diesel oil, gasoline, hexane, and toluene, as well as lower alcohols.

This invention relates to a synthetic surfactant-based concentrated extinguishing liquid that has excellent extinguishing power against fires caused by water-soluble organic liquids such as ketones and amines.

In recent years, not only petroleum-based water-insoluble liquids but also water-soluble organic liquids have been produced, stored, and consumed in large quantities, and there is a demand for extinguishing agents that are effective against fires caused by water-soluble organic liquids.

Conventionally, protein-based foam fire extinguishing agents, synthetic surfactant-based foam fire extinguishing agents, etc. are known as fire extinguishing foams for water-soluble organic liquids. In addition to having a peculiar odor, they cannot avoid spoilage during long-term storage, and must be replaced every year.

On the other hand, synthetic surfactant-based fire extinguishing foam is being actively developed, but it is inexpensive and has poor fire extinguishing performance.

No product has yet been developed that has sufficient long-term storage stability and practicality (it is unaffected by the quality of firefighting water and flows even at low temperatures). For example, in Japanese Patent Publication No. 54-24240, an expensive fluorine-based surfactant is used as a foaming component, and the product turns into a gel when left alone, has a high pour point, and solidifies at low temperatures. It's not something you can do.

The present inventors conducted extensive research on a concentrated fire extinguishing liquid that does not have the above-mentioned problems, and arrived at the present invention. That is, the present invention provides lower alcohol-soluble, water-insoluble modified products (B) of carboxyl group-containing water-soluble polymers (A) selected from the group consisting of xanthan gum (al) and carboxyl group-containing derivatives of xa/tan gum (a2). o, o t~5% by weight
This is a concentrated fire extinguishing liquid characterized by containing a surfactant, a water-soluble inorganic metal salt, a water-soluble organic solvent, and water gold.

Xanthan gum (al) in the present invention is an extracellular polysaccharide produced by fermenting bacteria of the genus Xa/Tomonas in a glucose medium, and the details are disclosed in JP-A-48-49686 and JP-A-54-128487. , patent application 1982-1
02141 specification and “Comprehensive Polysaccharide Science (G)” (
fL Atsuya Ta, Akira Misaki (eds., Kodansha, 2nd edition published September 1, 1976)), pages 145 to 149. Roadpole [Rohmeg-2] is a commercially available xanthan gum product.
These products include Echo Gum (a product of Dainippon Pharmaceutical Co., Ltd.), Kelzan (a product of Sansho Corporation), and others.

Examples of the carboxyl group-containing derivative (a2) of xanthan gum include hydrolysates of xanthan gum, carboxymethylated products, carboxymethylated products of hydrolysates of carboxyne methylated products, and mixtures of two or more thereof.

The above hydrolyzate can be produced by a conventional hydrolysis method, for example, published in Patent Publication No. 56-50008.
This can be carried out by the method described in No. 0, page 8, No. 6-. Specifically, this can be carried out by heating or oxidation. For example, hydrolysis and degradation can be carried out by heating and boiling the compound to be hydrolyzed, or by treating it with an oxidizing agent such as H,02 or acidified potassium permanganate. The hydrolyzate is also still fairly insoluble in lower alcohols, and degradation is said to only shorten the polymer chain by about 20-80%.

Further, the above carboxymethylated product can also be produced by a conventional carboxymethylation method.

For example, this can be carried out by reacting a compound to be carboxymethylated with monochloroacetic acid.

Specifically, No. 419 of "Basic Synthetic Resin Chemistry" (New Edition) (written by Tadahiro Miba, Gihodo, published November 25, 1975)
An example of this method is to use xanthan gum or the like in place of pulp in the method described on page 1.

Among the above-mentioned (al) and (a2), preferred are the xanthan gum in (al) and the hydrolyzate of xanthan gum in the item (a2).

``Lower alcohol-soluble, water-soluble modified product (2) of the carboxyl group-containing water-soluble polymer (8) used in the present invention.
), the modified product (B) is a water-soluble polymer (A)
(C) K-based modified products selected from the group consisting of amines and cationic surfactants.

The above-mentioned amines include alkyl amines (the alkyl group has 4 to 25 carbon atoms, preferably 6 to 2 o carbon atoms).

7'c, such as 1,8.5-trimethylhexyl; octyl; decyl; dodenyl; tridecyl; octadecyl-amine, etc.), aralkylamine (benzylamine, etc.), cyclokylamine (cyclohexylamine, etc.), Examples include aryl amines (such as aniline), heterocyclic amines (such as pyridine), and mixtures of two or more thereof. Among these, preferred are alkylamines.

The above-mentioned cationic surfactants include common ones, such as those listed below.

[■] Quaternary ammonium salt type cationic surfactant (+-1)l+l Aliphatic amine type quaternary ammonium salt type cationic surfactant described in JP-A-56-47498 can be given.

Specifically, the following steps are taken.

(1) Monoalkyltrimethylammonium salts such as nidodecyltrimethylammonium chloride (2) Monoalkyldimethylammonium salts such as dihexadecyldimethylammonium fluoride (3) Monoalkyldimethylbenzylammonium salts;
Octadecyldimethylbenzylammonium chloride, etc. (4) Dialkylmethylbenzylammonium salt: tetradecyl octadecylmethylbenzylammonium bromide, etc. (5) C2-C8 alkyl group, amide group or/and C2-C4 hydroxyalkyl group Quaternary ammonium salts with: monoalkyldimethylhydroxypropylammonium chloride, etc. (1-J), cyclic amines (pyridine, morpholine, etc.)
Examples include quaternary ammonium salts of the cyclic amine type described in Japanese Patent Application No. 55-28458.

(1) Number of carbon atoms usually 8 to 24. Alkyloxymethylpyridinium salt (2) preferably having 12 to 18 alkyl groups, usually 8 to 24 carbon atoms. Preferably an alkylpyridinium salt having 12 to 18 carbon atoms (3) An alkylquinolinium salt having usually 8 to 24 carbon atoms, preferably 12 to 18 carbon atoms 1111 Amine salt type cationic surfactant (J-1)
The general formula [wherein R1 has 4 to 25 carbon atoms] Preferably 6 to 20 straight chain 9 branched or cyclic alkyl groups tR2+R3 are H2
Straight chain or branched alkyl group having 1 to 20 carbon atoms or +
R4-04H (R, is an alkylene group having 2 to 4 carbon atoms; n
is an integer from 1 to 80), and B is an acetic acid group or a hydrochloric acid group]. Specifically, the details are as follows.

(1) Chemical no-, di-, or tri-alkylamine salts such as nilaurylamine hydrochloride, distearylamine hydrochloride, benzylamine acetate, cyclohexyldimethylamine acetate, etc. (2) Salts of alkylene Oquindo adducts of alkylamines: Dihydroxyethylmethylallylamine acetate, hydrochloride of ethyl V/Oquinde 16 mole adduct of laurylamine, etc. (s-x) x y, chill type amine salt: triethanolamine monostearate formate, etc. (2'-noamide type) Amine salts: stearamide ethyl diethylamine acetate, etc. (j-4) Arcobel A type cationic surfactants: Arcobel A, Arcobel α [Arnold Hoffman Co. (USA) products], etc. (U”υ imidacillin type cation/interface) Active agent: Cationic surfactants that can be used, such as 2-hair''tadecenyl-hydroxyethylimidacillin acetate, are listed in the revised edition of "Introduction to New Surfactants" (written by Takehiko Fujimoto, published December 20, 1972). It is also described on pages 69 to 77 of Sanyo Kasei Kogyo ■).

Among the above compounds (C), preferred are cationic surfactants, and particularly preferred are quaternary ammonium salt type cationic surfactants.

Modified product (B) of water-soluble polymer) with compound (C)
The weight ratio of (C) to (mu) is usually 0.1.
Above, preferably 0.5 to 1O. (C) is 0.1
If it is less than that, it will not become soluble in lower alcohols or insolubilized in water.

The reaction temperature in the case of modification is usually 0 to 100°C, preferably 10 to 60°C. As for the reaction method, (A) is usually 0. Add (C) Th to the O1-10 aqueous solution,
An example is a method of stirring.

The obtained modified product (B) is a lower alcohol (methanol).

1 to 8 carbon atoms such as ethanol and isopropanol
The viscosity of the dialcohol can be increased by dissolving it in 7A/Co-10 to form a 0.01 to 1% lower alcohol solution. The viscosity is usually 50 cp or more, especially 100 to 80,000 cp in the case of a 1 t lower alcohol solution. For example, in the case of a modified product of xanthan gum with cetylpyridinium chloride, the viscosity of a 1% methanol solution is usually 600 to 10,000 cp. It also does not dissolve in water at all. On the other hand, the water-soluble polymer (2) of metamorphic cutting is dissolved in water, and the viscosity of the water is increased by forming an aqueous solution of usually 0.01 to 1%. The viscosity is usually 5
It is over 00 cp, with some as high as over 20,000 cp, and some even become gel-like.

However, it does not dissolve at all in the above lower alcohol.

Other properties of the modified product (B) include a natural polysaccharide polymer or
Similar to its derivatives, it is a light yellow to pale yellowish brown solid with an apparent specific gravity of usually 0.2 to 7. Carbonization temperature is usually 200-4
00℃, spontaneous ignition temperature is usually a o o ~ so o”
cThru.

Examples of the surfactant used in the present invention include sulfonate type surfactants and/or sulfate salt type surfactants. Examples of the sulfonate type surfactants include the alkyl-substituted aryl ether sulfonate type surfactants described in JP-A-55-76668 and other sulfonate type surfactants. Specifically, the alkyl-substituted arylether sulfonate has the following general formula (
In the formula, R is an alkyl group + Ar is an aromatic nucleus, M is a cation, m, n, x and y are integers from 0 to 2, provided that m+n
is an integer of 1 or more, and ) ('+y is an integer of 1 or more).

Examples of the alkyl-substituted aryl ether sulfonate include monoalkyl diphenyl ether disulfonate, monoalkyl diphenyl ether monosulfo/1"I! salt + dialkyl diphenyl ether disulfo/acid, and monoalkyl dinaphthyl ether disulfonate. , and mixtures of two or more of these.

In addition to the above-mentioned alkyl-substituted diarylether sulfonic acid, the alkyl-substituted aryl ether sulfonic acid salt can be prepared by the following general formula [wherein R, Ar, and M are the same as in general formula (2), and R' is an alkyl The group is an aralkyl group, m is an integer of 1 or more, x, I! is 1 or 2. ] Examples include alkyl-substituted arylalkyl ether sulfonates and alkyl-substituted arylalkyl ether sulfonates. Two or more of these may also be used in combination.

Other sulfo/acid surfactants include alkyl (08
~18) Benzene sulfo7 acid kn * alkyl (C
8-18) Sulfonate, naphthalene/-matahaalkylnaphthalene sulfonate, sulfosuccinic acid x y,
T/ML Furkyl- or alkylbenzyl-benzimidazole sulfonate (Japanese Patent Publication No. 14860/1986)
Examples include those described in the above issue) and mixtures of two or more of these.

Among the sulfonate type surfactants, preferred are alkyl-substituted arylether sulfonates.

In addition, sulfate ester salt type surfactants are
Examples include those similar to those described in Japanese Patent No. 6668. Specifically, the following general formula % formula % (4) [wherein R] is an alkyl group, P is an integer a of 0 or 1 or more,
M' is a cation (such as an alkali metal, ammonium or alkanolamine cation). ] Examples include higher alcohol sulfate ester salts and/or polyoxyethylene alkyl ether sulfate ester salts.

Examples of the above salts include natural alcohols, synthetic alcohols, mixtures of these alcohols, and sulfate ester salts of their ethylene oxide adducts.

Other sulfate ester salt type surfactants other than the above sulfate ester salt type surfactants include polyoxyethylene alkylaryl ether sulfate salt, polyoxypropylene- or polyoxyethylene ethylene//oxyglopylene-alkyl ether sulfate. Ester salts, sulfuric acid varnishes of higher fatty acid esters Examples of the salt-forming cations of the sulfuric ester salts include alkali metals, ammonium, and alkanolamine cations.

Among the sulfate salt type surfactants, preferred are higher alcohol sulfate salts, polyoxyethylene alkyl ether sulfate salts, and those containing these in an amount of 20% by weight or more (particularly 85% by weight or more).

The surfactant can also contain other surfactants. These surfactants include those described in JP-A-55-76668, such as nonionic surfactants and fluorine-based surfactants.

Examples of nonionic surfactants include polyoxyalkylene nonionic surfactants (polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether,
Polyoxyethylene alkylamine, polyoxyethylene alkylamide.

Polyoxyethylene JJ (fatty acid esters, etc.), ester surfactants (fatty acid esters of polyhydric alcohols such as glycerin and sorbitan, etc.), fatty acid alkylolamides (nyol-type surfactants), and mixtures of two or more of these Examples of fluorine-based surfactants include sulfoalkyl group-containing surfactants such as carboxylates,
Sulfonate.

Examples include sulfonamide aliphatic acid salts, carbonamide aliphatic acid salts, and mixtures of two or more thereof. Among these, preferred are fluorine surfactants.

Examples of water-soluble inorganic metal salts include Na, Ae and/or
Alternatively, salts of metals such as Mg and inorganic acids such as hydrochloric acid, sulfuric acid and/or nitric acid may be mentioned. The salt may be a hydrated salt. Specifically, the following salts can be mentioned.

(1) Hydrochloride KaCl, KCI, AlCl3. MgCl2 (anhydrous salt, hexahydrate, etc.), etc. (2) Sulfate Na25041 K! 5041 Al! 2(S04)3
(Anhydrous salt, 18 hydrate, etc.) 1MgSO4 (Anhydrous salt,
(7 hydrate, etc.) etc. (3) Nitrate NaN0a l KNO31AI! (NO3) 39 hydrate 9 Mg CN03) 2 Hexahydrate and other water-soluble organic solvents include lower alcohols (having 1 to 1 carbon atoms)
Aliphatic alcohols having 4 straight or branched alkyl groups, such as methyl alcohol.

Ethyl alcohol, isopropyl alcohol, raftyl alcohol, t-butyl alcohol + Sec-butyl alcohol, etc.); mono- or diethylene glycol monoalkyl ether (alkyl group has 1 to 5 carbon atoms and has a linear or branched alkyl group, such as methyl Cellosolve, butyl cellosolve t Goutyl cellosolve, n-propyl cellosolve + 180-propyl cellosolve, n-pentyl cellosolve # n-butyl carpitol ethyl carpitol, etc.); Mohe di- or tri-alkylene glycol (with 2 to 4 carbon atoms) Examples include those having an alkylene group (e.g., ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, etc.); ketones (methyl ethyl ketone, diethyl ketone, acetone, etc.); cyclic ethers (tetrahydrofuran, V-oxane, etc.), and mixtures of two or more of these. .

Among the water-soluble organic solvents, preferred are mono- or diethylene glycol monoalkyl ethers and mohedi- or trialkylene glycols, and particularly preferred are ethylcellosorg, butylcellosorg, ethylene glycol and diethylene glycol.

Force\'° et al ←, 3 Fresh water (soft water) is used, and spring≠ζdeath→i Rumor n-0 In addition to the above-mentioned components, the concentrated extinguishing liquid of the present invention contains various commonly used additives. Can be blended. Such additives include foam stabilizers.

Includes PH buffers and other additives.

The above-mentioned foam stabilizers include higher alcohols having 10 and 18 carbon atoms (lauryl alcohol, myristyl alcohol, etc.), and the pH buffers include alkali metal salts of carbo/acids or oxycarboxylic acids (sodium citrate, sodium acetate, Other additives include preservatives (such as formaldehyde) and solubilizers (such as urea).

Examples include sucrose, etc.), plasticizers (ammonium sulfate, etc.), and chelating agents. The amounts of these additives used are similar to those in conventional fire extinguishing agents (e.g. foam stabilizers at 0.5-5% by weight).
, PH buffer is 8% by weight or less) and the usage conditions (such as 8% by weight or less)
(e.g., fire extinguishing equipment, etc.).

An example of the composition of the concentrated fire extinguishing liquid of the present invention is as follows. (% is weight%) Modified product Usually 0.01-5% (preferably 0.1-8%) Surfactant Usually 1-40% (preferably 5-30%) Water-soluble inorganic metal salt Usually 0.5-20% (preferably 2
-15 inches) Water-soluble organic solvent Usually 1-50% (preferably 5-40 inches) Water Usually 1-80% (preferably 5-70 inches) Additive Usually θ-20% (preferably 0-12 inches) In the above, if the amount of the modified product is less than 0.014, the fire extinguishing performance against water-soluble liquids will be poor (for example, when extinguishing a fire caused by water-soluble liquids, sealing performance and reflammability will be poor). Moreover, if it is larger than 5 inches, the viscosity of the concentrated liquid becomes high, which poses a problem in terms of practicality.

To create a concentrated liquid, mix each component and use a regular stirring and mixing device, such as a Gon-type stirring blade, a homomixer [manufactured by Tokushu Kika Kogyo ■], a turbo reactor [Turbo Kogyo (Yokosaki), etc.] One example of the preparation method is to put each ingredient into a mixing pot equipped with a willow-shaped stirring blade,
After stirring at 5°C for 30 minutes, the mixture is stirred and mixed at 20 to 60°C for about 2 hours while circulating in a turbo reactor to obtain a uniformly fluid mixed solution.

The properties of the mixed solution obtained by the above method are, for example, a concentrated liquid with a dilution rate of 8 volumes when used, and a viscosity of 50 to 2000 c.
p (Using a Brookfield type low viscosity viscometer, /
168 spindle, spindle speed 80 rpm, temperature 25 °C), pour point -2,5 to -10 °C, PH 6 to 8,
It has a weak odor and is stable for more than 5 years.

The liquid of the present invention is normally used in fire extinguishing water (freshwater (soft water), hard water, seawater, etc.) at an appropriate concentration (for example, the concentration of surfactant is 0.02 to 8% by weight, and the dilution rate of concentrated liquid is 2 to 5% by volume. ) and use the usual method, for example, (1) l (2
) Also, it can be used according to the method of Fi (3): (1) A concentrated liquid is sucked into the water stream from just before the fire extinguisher or foam nozzle as a stock solution, and air is introduced through a pipe rod to stir and foam. A method of emitting radiation from the tip of the tube to the surface of the flame.

(2) Fire extinguishing water and concentrated liquid may be mixed together, but may not be mixed together and may be mixed in on the way to the fire extinguishing device or foam nozzle;
A method in which air is introduced into a tube to generate foam and radiate from the tip of the tube to the igniting surface.

(3) A method in which fire extinguishing water and concentrated liquid are mixed together, or without being mixed, the water is foamed with a foam head so as to be mixed in from another location, and then radiated to the fire site.

The concentrated extinguishing liquid of the present invention is a water m 6 M system containing alcohol (lower alkyl: '-lua' c, !-, t, methanol, ethanol), m-chill, ketone, ester, amine, etc. g is effective for. Gasoline again.

It can also be used to fight fires involving various flammable liquids such as kerosene, heavy oil, hydrocarbon solvents such as benzene and xylene, and oils and fats.

The concentrated fire extinguishing liquid of the present invention has strong extinguishing performance (
It has the properties of a moxibustion pot, such as being inexpensive and durable for long-term storage, not being affected by the quality of fire extinguishing water, and having a low pour point. be. Moreover, the concentrated fire extinguishing liquid of the present invention is disclosed in Japanese Patent Application Laid-Open No. 55-7
The fire extinguishing agent described in Japanese Patent No. 6668 is also excellent in terms of fire extinguishing performance (sealability and re-flammability).

Since the mixed solution of the present invention exhibits the above-mentioned effects, it is suitable for fires in chemical factories, etc., and particularly in fires in industrial complexes near the coast. It is also suitable for fires in oil tanks and gas stations.

The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto. Parts in Examples indicate parts by weight.

The concentrated liquid was prepared by the following method (1) or (2) after blending.

(1) Pour each component into a mixing pot equipped with a willow-shaped stirring blade, stir at 15-85°C for 80 minutes, and then stir and mix at 20-60°C for about 2 hours while circulating in a turbo reactor to ensure uniform fluidity. It was made into a liquid with sexual properties.

(2) Add the iC ingredients to the blending pot (#II type stirring blade 5) and stir at 15 to 85°C for 80 minutes. ) to make a uniform and fluid liquid.

Example 1 Modified product of xanthan gum with cetylpyridinium chloride 1.0 parts Mixture of above and hiscynonyl diphenyl ether mono and disulfonic acid sodium salts 8.0 parts Polyoxyethylene (average 2 mol) 2-uryl ether sulfate sodium salt 15, 0 parts magnesium chloride 6 hydrate salt 10.0 parts butyl cellosolve
1000 parts water
60.0 parts lauryl alcohol
The mixture was blended so that the amount was 1.0 part, and a uniform liquid was prepared using the method (2).

(Note 1) Modified products of xanthan gum include xanthan gum (
Add cetylpyrinnium chloride (B) to the 1% water bath solution of 5).
) in a ratio of (A):(B)-1:1,
It was created by stirring at 20-25°C.

Example 2 Modification product of xanthan gum hydrolyzate with stearyldimethylbenzylammonium chloride
a, mixture of mono- and dinonyl diphenyl ether mono- and disulfonic acid sodium salts and mono- and didodecyl diphenyl ether mono- and disulfonic acid sodium salts 4
, 0 parts Polyoxyethylene (average 1 mol) Sodium lauryl ether sulfate salt 16.0 parts Sodium chloride
4.0 parts Magnesium chloride hexahydrate
7.0 parts butyl cellosolve
5.0 parts ethylene glycol 5.0 parts water 5
4.4 parts oxo alcohol having an average carbon number of 18 1.5 parts formaldehyde 0.1 part were blended, and a homogeneous liquid was prepared by the method (1).

(Note 2) To create a modified product, add hydrochloric acid to a 0.8 N aqueous solution of xanthan gum, heat it at 97°C for 1 hour, and add stearyldimethylbenzylammonium chloride (B) to (A). :(B)-1:1 and stirred at 80°C.

Example 8 Table 1 shows a comparison of properties between the concentrated fire extinguishing liquid of the present invention and conventional fire extinguishing foam for water-soluble organic liquids (protein-based, fluorine-based).

Table-1 Properties (Note 8) Comparative Example 1 Fluorine-based fire extinguishing foam for water-soluble organic liquids. Commercial goods.

(Note 4) Comparative Example 2 N Protein-based foam τ flashing agent. Commercial goods.

(Note 5) In Table 1, the viscosity was measured using a Brookfield type low viscosity meter at a spindle speed of 80 rpm and a temperature of 25°C.

As is clear from Table 1, the concentrated liquid for 7-shobi of the present invention is excellent in properties. That is, compared to Comparative Example 1, it is superior in viscosity, pour point, and dilution rate, and compared to Comparative Example 2, PH. Excellent in dilution rate, stability and odor.

Test Example 1 A fire test was conducted on the concentrated extinguishing liquid of the present invention, and the results are shown in Table 2.

This experiment was conducted in the following manner.

-1) Implementation Condition 1, Foaming Nozzle: In Examples 1 and 2 and Comparative Example 8/I4, the standard foaming nozzle for synthetic surfactant foam fire extinguishing agent test described in Ministry of Home Affairs Ordinance No. 26, Comparative Example 1f'i. In Comparative Example 2, the standard foaming nozzle for testing protein foam fire extinguishing agents described in the same ministerial ordinance was used.

2. Working pressure and: Pressure 7 KgΔze, Discharge amount 10/
4 Discharge amount 8, Combustion tank: 1.415mX1.415mX0
．． 8m4 of combustion liquid: 100I! Amount 5. Mixing method: Premix 6. Fire extinguishing water: Tap water as fresh water, seawater and water quality
Synthetic seawater having a composition of 1.10 parts of magnesium chloride hexahydrate, 0.16 parts of calcium chloride dihydrate, 2.50 parts of sodium chloride, 0.40 parts of sodium sulfate, and 95.84 parts of water was used.

(2) Total foam performance measurement: The foam generated by the nozzle is collected into a container whose weight and volume have been measured in advance.
The foaming ratio was measured in terms of the weight and volume of the foam, and the water retention capacity of the foam was measured in terms of the time required for the weight of the liquid accumulated at the bottom of the container to reach 1/4 of the weight of the foam in the container.

(2)'Self-fire guidelines 1. Pre-combustion: Free combustion was performed for 1 minute after ignition.

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

8. Foaming time 2. Foaming was continued for 5 minutes from the start of foaming.

4. Sealing test 2 Ten minutes after foaming stopped, a flame was brought close to the foam surface to test whether combustion occurred.

5. Re-flame test: 20 minutes after the start of extinguishing, insert a 15cIrL square cylinder into the center of the foam in the oil pan, remove the foam inside the square cylinder to expose the fuel surface, ignite it, and fully After confirming combustion, the square tube was pulled out and changes in the combustion surface were observed for 5 minutes after pulling out the square tube.

As is clear from Table 2, the liquid of the present invention is particularly superior to the comparative example in terms of foaming ratio, water retention, and rekindling test, whether the fire extinguishing water is freshwater or seawater. This is because the liquid foam of the present invention has excellent liquid resistance against water-soluble organic liquids, quickly develops on the burning surface, does not disappear even with the heat and flame of a fire, and the fluidity of the foam remains for a long time. It shows that it is lasting.

Based on these results, the concentrated fire extinguishing liquid of the present invention has strong extinguishing power, sealing power, and re-ignition prevention power against fires caused by water-soluble organic liquids, while being inexpensive, durable for long-term storage, and capable of extinguishing fires. It is clear that the water used can be freshwater or seawater, and it has a number of excellent effects such as low viscosity, low pour point, and excellent dilution rate, making it suitable for use.

Patent applicant: Hatsuda Seisakusho Co., Ltd.

Claims (1)

[Scope of Claims] 1. A lower alcohol-soluble, water-insoluble modified product (B) of a carboxyl group-containing water-soluble polymer selected from the group consisting of xanthan gum (a+) and its carboxyl group-containing derivative (a2)) 0. 1. A concentrated liquid for fire extinguishing, characterized in that it contains a commercial amount of O1 to O5, a surfactant, a water-soluble inorganic metal salt, a water-soluble organic solvent, and water. 2. The liquid according to claim 1, wherein β) is a modified product of (5) with a compound (C) selected from the group consisting of amines and cationic surfactants. 8. The liquid according to claim 2, wherein the weight ratio of (C) to 7) is 0.1 or more. 4. (B) Claims 1 to 8, which are compounds soluble in a lower alcohol selected from the group consisting of tanol, ethanol, and isopropyl alcohol.
The liquid described in any of the paragraphs. 5. According to any one of claims 1 to 4, wherein (a2) is a dicarboxymethylated product of a hydrolyzate of xanthan gum, a hydrolyzate of a carboxymethylated product, or a carboxylmethylated product of a hydrolyzate. liquid. 6. The surfactant is a sulfonate type surfactant and/or
or the liquid according to any one of claims 1 to 5, which is a sulfate ester salt type surfactant. 7. The liquid according to any one of claims 1 to 6, wherein the water-soluble inorganic metal salt is a salt of Na, Al, Al and/or Al. 8. Claim No. 8, wherein the water-soluble organic solvent is a lower alcohol, mono- or diethylene glycol monoalkyl ether (alkyl group has 1 to 5 carbon atoms), chemical, di- or tri-alkylene glycol, ketone and/or cyclic ether The liquid according to any one of Items 1 to 7.