JP2002291939A - Extinguishing agent, composition for fire extinguishing water, preparation method and fire extinguishing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide am extinguishing agent which has a low viscosity at ordinary temperature, forms a thickened or gelatinized state by the heat of a fire, is capable of extinguishing the fire in spite of use in a small amount and has an excellent, fire extinguishing effect for diversified kinds of the fires, a composition for fire extinguishing water, a preparation method for the same and a fire extinguishing method using the same. SOLUTION: The extinguishing agent containing a thermosensitive polymer which is soluble below a specific set temperature in an aqueous potassium salt solution of a specified concentration and thickened or gelatinized at above the set temperature and potassium salt water and the composition for fire water prepared by dissolving the same into water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguisher, a fire extinguishing water composition containing a thermosensitive gel and potassium salts for preventing the spread of fire spread, preventing reburning, and suppressing water damage, and a method for preparing the same. And a fire extinguishing method using the same.

[0002]

2. Description of the Related Art Conventionally, fire extinguishing agents widely used include ABC / BC powder-based extinguishing agents, carbon dioxide-based extinguishing agents, and water-based extinguishing agents such as mechanical foam extinguishing agents and reinforcing liquid extinguishing agents. Among them, water-based fire extinguishing agents have many advantages, such as exhibiting a cooling effect due to evaporation and a certain oxygen blocking effect due to the formation of a water vapor layer when extinguishing a fire. ing. However, these water-based fire extinguishing agents are fire A, fire B,
C is effective against fires, etc., but it is said that it can not cope with tempura oil fires, stove kerosene fires, and tire fires because it has no cooling effect or fires are extinguished and the fires are often high. hard.

[0003] In order to enhance the fire extinguishing performance of water, a number of improvement methods have recently been proposed in which various additives are added. For example, JP-A-11-188117 discloses that various organic and inorganic salts, fluorine-based surfactants, and the like are dissolved in water to cause fires A, B, C, tires, tempura oil, and stove kerosene. A fire extinguisher composition is disclosed that can be used to extinguish a relatively large number of small fires. Japanese Patent Application Laid-Open No. H11-235398 discloses that a salt having a remarkably high solubility in water is used in order to solve a drawback that there is a certain limit in the increase in fire-extinguishing efficacy derived from the solubility upper limit of the salt. Has been stated. However, although the initial fire-extinguishing efficacy is increased, it is difficult to say that the re-ignition prevention effect is excellent because the air layer cannot be shut off continuously. In use, adversely affects the environment.

Further, since the conventional water-based fire extinguishing agent has low viscosity and good fluidity, there is a problem of water loss due to run-off and scattering at the time of fire extinguishing, and it is necessary to continuously discharge water for a long time. As a result, for example, when a fire in a high-rise building is extinguished, a large amount of water flows down, flooding the lower layers that is not directly related to the fire, causing damage to household goods and possibly causing a fire involving the electrical system. In addition, in the event of an earthquake, water sources are limited due to rupture of water pipes, cracks in fire prevention water tanks, etc., which may hinder fire fighting activities. Furthermore, in firefighting activities in dry areas such as forests, bushes, grasslands, and mountains, aerial firefighting methods of spraying firefighting water from the air using helicopters or small airplanes are generally used. There is a problem that it requires a large amount of fire extinguishing water and also leads to the spread of fire.

As described above, the fire extinguishing water using the conventional water-based fire extinguishing agent can be expected to improve the initial fire extinguishing effect in proportion to the salt concentration, but it does not have a continuous fire extinguishing ability, so it is necessary to continuously discharge water. It has drawbacks such as the need for fire extinguishing, water loss is large, fire extinguishing efficiency is low and secondary disasters cannot be prevented, and large-scale fire extinguishing involves scattering problems and environmental problems. I have.

[0006] In order to solve the above-mentioned disadvantages of fire-extinguishing water, a large number of polymer gel additives have been proposed for the purpose of suppressing water loss particularly from combustion products. For example, US Pat.
No. 41, U.S. Pat. No. 4,978,460, U.S. Pat.
No. 110, JP-A-7-255870, JP-A-9-
JP 140826, JP 10-155932 and JP 10-192444 all emphasize the use of polymer additives, disperse a crosslinked polymer having a certain particle size in a water-miscible medium, and extinguish fire. It shows an improved method for preventing water damage by improving the adhesion of the sometimes absorbed gel to the surface of the burned material. However, each of these is a mixture obtained by adding a water-insoluble powdery, granular or liquid-dispersed superabsorbent polymer gel to fire-extinguishing water, for example, when using the current standard fire-extinguishing equipment, Adhesion to the instrument occurs, and particularly, blockage of the apparatus due to aggregation of gel particles often leads to inoperability, which is extremely dangerous in practical use, and thus does not exceed the experimental stage.

Further, various water-soluble polymer thickeners for imparting viscosity to fire extinguishing water have been proposed in order to suppress water loss such as fire spread and fire extinguishing water flow-off and scattering. For example,
As such a thickener, JP-A-1-166777 discloses a fire-extinguishing agent composition containing a water-soluble polymer electrolyte such as carboxymethylcellulose sodium salt, sodium polyacrylate and sodium alginate as a thickener. is suggesting. However, even with the addition of these polymeric thickeners, the coexistence of salts such as flame retardants and the heat of fire have a major defect in that the viscosity of the fire extinguishing water significantly decreases. In order to obtain it, the amount of the polymer thickener added increases, the flowability decreases, handling is difficult, and the cost is inevitably increased.

Further, JP-A-59-97680 discloses that
A high-viscosity fire-extinguishing water containing aldehyde-pretreated hydroxyethylcellulose as a thickener, which does not cause a decrease in viscosity even in the presence of salts, is disclosed in
JP-A-6622 and JP-A-8-107946 disclose a fire spread inhibitor obtained by adding a cellulose derivative which is a thermogelling polymer and a superabsorbent resin. However, also in these compositions, the initial viscosity becomes too high due to the coexistence of salts, or a water-insoluble superabsorbent resin is used in combination, so that it is practically difficult to extinguish the fire with ordinary fire extinguishing equipment.

As described above, in the case of water for fire extinguishing using a polymer-based additive, when a conventional water-soluble polymer electrolyte is used as a thickening agent, it has a sufficient viscosity due to the heat of fire together with the coexistence of salts. When adding a nonionic cellulose derivative, which has a low water loss prevention effect because it is not available, the initial viscosity becomes too high and it is difficult to use, and the adhesion to combustion products is not sufficient, and a water-insoluble superabsorbent resin is used. When used or combined, there is a danger that the current standard fire extinguishing system may become blocked, leading to the inability to extinguish the fire, and there is no high-concentration, fast-dissolving fire extinguishing water suitable for extinguishing large-scale fires. It has disadvantages such as.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention is based on the present condition of such a fire extinguishing agent or fire extinguishing water, and is a current standard fire fighting system which overcomes the above-mentioned drawbacks in order to improve the efficiency of a water source in fire fighting activities. It has sufficient fluidity to easily squirt, rises to a sufficiently high viscosity so that it can adhere to the entire surface of the combusted material by the time of extinguishing, can rapidly thicken or gel, and extinguishes many types of fires An object of the present invention is to provide a fire extinguishing agent, a fire extinguishing water composition, and a fire extinguishing method using the fire extinguishing agent.

[0011]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve such problems, and as a result, have found that a composition containing a thermosensitive polymer and potassium salts can solve such problems. The invention has been reached. That is, the present invention provides (1) a fire extinguisher characterized by containing a temperature-sensitive polymer and potassium salts, and (2) a method in which a temperature-sensitive polymer is dissolved in a potassium salt aqueous solution at a certain concentration to a specific set temperature or lower. The fire extinguisher according to claim 1, wherein the specific temperature of the fire-extinguishing agent, (3) the temperature-sensitive polymer is 40 to 100 ° C. Item 1. Fire extinguisher according to item 2, (4) one of the thermosensitive polymers
wt% aqueous solution is 100 to 10000 mPa · s (25
Extinguishing agent according to claims 1 to 3, which has a viscosity of
(5) The fire-extinguishing water composition comprising a temperature-sensitive polymer, potassium salts and water, and (6) the amount of the temperature-sensitive polymer added is 0.1% by weight or more. The fire-extinguishing water composition according to claim 5, wherein (7) the amount of the potassium salt added is 0.2% by weight or more, and (8) the temperature-sensitive polymer and the potassium salt are added to water. A method for preparing a fire-extinguishing water composition containing a temperature-sensitive polymer, potassium salts and water, characterized by being dissolved in
(9) a method for preparing a fire-extinguishing water composition containing a temperature-sensitive polymer, potassium salts and water, wherein a vinyl monomer is polymerized in an aqueous solution in the presence of a potassium salt;
(10) A fire extinguishing method characterized by using the fire extinguishing agent according to (1) to (4), (11) above (5)
To (7) a fire extinguishing method characterized by using the fire extinguishing water composition according to (7), (12) diluting the fire extinguishing water composition adjusted to a high concentration to a predetermined concentration with water at the time of use. It is intended to provide the fire extinguishing method according to the above (11), which is used.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The temperature-sensitive polymer used in the present invention is "a temperature-sensitive polymer which is water-soluble at a temperature below a specific set temperature (hereinafter referred to as" temperature point ") and solidified at a temperature above the temperature point". In particular, it is preferable to use "a solution which is soluble in a potassium salt aqueous solution having a certain concentration at a temperature lower than a specific set temperature and thickens or gels at a temperature higher than the predetermined temperature". The term "constant concentration" as used herein refers to a concentration of 1% by weight, and "thickening" refers to a viscosity 10 times or more at a set temperature with respect to the viscosity at 25 ° C of a 1% by weight solution of a thermosensitive polymer at the same potassium salt concentration. That means.

The fire extinguisher of the present invention, when dissolved in water, has a low viscosity at a set temperature or lower, so that it is easily ejected through the use of various standard fire extinguishing equipment and quickly covers the fire source in each direction. When the temperature exceeds the set temperature due to the heat of fire, gelation occurs rapidly. As a result, the fire extinguishing water can stay on the surface of the burning material before the fire is extinguished, and no water damage occurs, so that no secondary disaster is caused.

Further, since a gel isolation layer that blocks air during fire extinguishing is formed, a high cooling / burning prevention effect due to a continuous cooling action and an air blocking effect is exhibited, and there is no need to continuously discharge water.

The temperature-sensitive polymer used in the present invention is obtained by radical polymerization in a pure water or an aqueous solution of a potassium salt having a certain concentration or more using a vinyl monomer as a main material, particularly in consideration of availability and low cost. Vinyl (co) polymers are preferred.

As the vinyl monomer for obtaining the temperature-sensitive polymer used in the present invention, it is desirable that the homopolymer has a specific temperature-sensitive point in a potassium salt solution at a certain concentration, for example, N-acryloylpiperidine, N-
3-isopropoxypropyl (meth) acrylamide,
N-8-Aquiloyl-1,4-dioxa-8-azaspiro [4,5] decane, N-1-methoxymethylpropyl (meth) acrylamide, (meth) acryloyl-L-
Proline methyl ester, N-2-methoxyethyl-N
-N-propylacrylamide, N-2-methoxyethyl-N-isopropylacrylamide, N-methyl-N
-N-propyl (meth) acrylamide, Nn-propyl (meth) acrylamide, N-methyl-N-isopropylacrylamide, N-3-ethoxypropyl (meth) acrylamide, N-tetrahydrofurfuryl (meth) acrylamide, N -Isopropyl (meth) acrylamide, N, N-diethylacrylamide, N-1-
Methyl-2-methoxyethyl (meth) acrylamide,
N-2-ethoxyethyl (meth) acrylamide, N-
2-methoxyethyl-N-ethylacrylamide, N,
N-bis (2-methoxyethyl) acrylamide, N-
3-methoxypropyl (meth) acrylamide, N-cyclopropyl (meth) acrylamide, N-ethyl (meth) acrylamide, N- (1,3-dioxolan-2)
-Ylmethyl) -N-methylacrylamide, N-methyl-N-ethylacrylamide, N-acryloylpyrrolidine, N- (2,2-dimethoxyethyl) -N-methylacrylamide, N-3- (2-methoxyethoxy)
N-substituted (meth) acrylamide derivatives such as propyl (meth) acrylamide and acrylamide compounds containing an amino acid group; N-vinyl-substituted amide derivatives such as N-vinylcaprolactam, N-vinylisobutyramide and N-vinyl-N-methylacetamide , 2-morpholinoethyl (meth) acrylate, 2- (2-morpholinoethoxy) ethyl (meth) acrylate, 2-morpholinopropyl (meth) acrylate, morpholinetetraethyleneoxy (meth) acrylate, 3,5-dimethylmorpholinetetraethylene Oxy (meth) cullate, methoxypolyethylene glycol mono (meth) acrylate, methoxypolyethylene glycol / polypropylene glycol mono (meth) acrylate, methoxypolyethylene glycol / polybutyl Glycol mono (meth) acrylate, ethoxy polyethylene glycol mono (meth) acrylate, ethoxy polyethylene glycol / polypropylene glycol mono (meth) acrylate, ethoxy polyethylene glycol / polybutylene glycol mono (meth) acrylate, butoxy polyethylene glycol mono (meth) acrylate Acrylate, phenoxy polyethylene glycol mono (meth) acrylate, benzyloxy polyethylene glycol mono (meth) acrylate,
Examples thereof include, but are not particularly limited to, ester-type vinyl monomers such as hydroxypropyl acrylate and ether-type vinyl monomers such as vinyl methyl ether, methoxyethyl vinyl ether and ethoxyethyl vinyl ether. These vinyl monomers may be used alone or in combination of two or more. Among the above examples, N-substituted (meth) acrylamide derivatives are particularly preferred. The ratio of these vinyl monomers varies depending on the difference in the viscosity or gelation temperature of the temperature-sensitive polymer, but is preferably 50 mol% or more, more preferably 70 mol% or more, and even more preferably 80 mol% or more. When the proportion of the vinyl monomer is less than 50 mol%, there is a possibility that an excellent hydrogel due to heat may not be obtained. Cannot be achieved.

As the temperature-sensitive polymer, a copolymerizable ionic vinyl monomer can be used in order to adjust the viscosity or gelation temperature thereof and to improve the water retention after the viscosity increase or gelation. These ionic vinyl monomers include, for example, (meth) acrylate (alkali metal salt, ammonium salt), 2- (meth) acrylamido-2-methylpropane sulfonate (alkali metal salt,
Ammonium salt), p-styrene sulfonate (alkali metal salt, ammonium salt), vinyl sulfonate (alkali metal salt, ammonium salt), methallyl sulfonate (alkali metal salt, ammonium salt), 2- (meta) ) Anionic vinyl monomers such as acryloyloxyethanesulfonate (alkali metal salt, ammonium salt) and mono (2- (meth) acryloyloxyethyl) acid phosphate salt (alkali metal salt, ammonium salt); tertiary amino group Cationic vinyl monomers such as various quaternary ammonium salts derived from a (meth) acrylate derivative having a tertiary amino group and various quaternary ammonium salts derived from a (meth) acrylamide derivative having a tertiary amino group;
Intramolecular salt-forming monomers having various zwitterionic groups derived from (meth) acrylate derivatives having tertiary amino groups, and intramolecular salts having various zwitterionic groups derived from (meth) acrylamide derivatives having tertiary amino groups Examples thereof include, but are not particularly limited to, amphoteric vinyl monomers such as a forming monomer and acrylamide derivatives containing an amino acid salt. These ionic vinyl monomers may be used alone or in combination of two or more. Among the ionic vinyl monomers exemplified above, anionic vinyl monomers are preferable, and alkali metal salts of (meth) acrylic acid and sulfonate type anionic vinyl monomers are more preferable.

The temperature at which the temperature-sensitive polymer thickens or gels is not particularly limited. However, considering the season, the temperature at the fire site, the type of water source, and the like, the temperature at which the fire extinguishing water does not thicken or gels in the fire-extinguishing equipment. It is necessary to set more than
What is necessary is just to control in the temperature range of 0-100 degreeC.

A 1% by weight aqueous solution of a temperature-sensitive polymer is 10%.
Those having a viscosity of 0 to 10000 mPa · s are preferable, those having a viscosity of 300 to 5000 mPa · s are more preferable, and those having a viscosity of 500 to 2000 mPa · s are more preferable. The viscosity of 1% by weight aqueous solution is 1
If it is less than 00, the composition formed by adding the water to fire extinguishing water may not exhibit a viscosity increasing or gelling property.

The potassium salts used in the present invention include, for example, acetate, carbonate, bicarbonate, tartrate, lactate, tetraborate, chloride, phosphate, citrate, silicate, succinic acid Examples thereof include salts and maleates, but are not particularly limited. These salts may be used alone, or two or more of them may be used in combination to obtain a synergistic effect. Among these exemplified potassium salts, potassium acetate, potassium carbonate, potassium bicarbonate, potassium tetraborate,
Potassium chloride is more preferred.

The fire-extinguishing water composition of the present invention contains a temperature-sensitive polymer, potassium salts and water, and may be prepared by any method. A method of adjusting by adding an aqueous solution and a potassium salt or an aqueous solution thereof, a method of preparing a temperature-sensitive polymer by adding a potassium salt at a predetermined concentration in pure water and polymerizing a vinyl monomer, and the like. Can be. The fire-extinguishing water composition can be manufactured by adjusting the concentration at the time of fire-extinguishing, but can be prepared at a high concentration, and has a long-term storage stability,
Because it is in a liquid state, it can be rapidly diluted at the time of fire extinguishing. The concentration of the thermosensitive polymer used for firefighting is 0.1 to
It is preferably 3.0% by weight, more preferably 0.4 to 2.0% by weight, and still more preferably 0.6 to 1.0% by weight.
If the content is 0.10% by weight or less, the fire extinguishing water may not be sufficiently thickened and gelled by the heat of the fire. Conversely, if the content is 3.0% by weight or more, the initial viscosity of the fire extinguishing water becomes It becomes too high and the water discharge operation becomes difficult. The concentration of the thermosensitive polymer to be prepared is not particularly limited, but is preferably adjusted to a high concentration, preferably 1.0% by weight or more, more preferably 5.0% by weight or more, and particularly preferably 10.0% by weight or more. . When the prepared concentration is 1.0% by weight or less, the dilution ratio for adjusting to the used concentration is low, and a large amount of undiluted solution is required for extinguishing a large-scale fire. The adjusted concentration of the potassium salt varies depending on the type of the temperature-sensitive polymer and the potassium salt, etc.
An addition ratio of 0 to 1000% by weight is preferable, and 70 to 50% by weight.
An addition ratio of 0% by weight is more preferable, and an addition ratio of 100 to 200% by weight is particularly preferable. If the addition ratio is less than 50% by weight, there is a possibility that a sufficient thickening gelation state may not be attained due to the heat of the fire. On the other hand, if it is more than 1000% by weight, the solubility of the temperature-sensitive polymer becomes poor and precipitates are formed. May occur.

The effects of the potassium salts used in the present invention are as follows. The potassium salts have excellent compatibility with the temperature-sensitive polymer and have an effect of improving the gelling power of fire-extinguishing water. Exhibits fire-extinguishing effects by chemical action against general fires (tempura oil, wood, paper, etc.). It shows a freezing point lowering effect.

The fire-extinguishing water composition may optionally contain a water-soluble crosslinking agent that causes a thermal crosslinking reaction of the temperature-sensitive polymer, a rust inhibitor, a freezing point depressant, and the like. The water-soluble crosslinking agent that can be blended varies depending on the composition of the temperature-sensitive polymer, but specifically, for example, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether,
Polypropylene glycol diglycidyl ether, 1,
6-hexanediol diglycidyl ether, glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, diglycidyl adipate, triglycol Epoxy compounds such as glycidyl isocyanurate, neopentyl glycol diglycidyl ether, furfuryl glycidyl ether, and glycidyl trimethyl ammonium chloride; and oxazoline compounds such as ethylenebisoxazoline and tetramethylenebisoxazoline. These water-soluble crosslinking agents are:
They may be used alone or in combination of two or more. Examples of the rust inhibitor include triazole compounds such as benzotriazole, 1,2,3-benzotriazole, 4-methylbenzotriazole and 5-methylbenzotriazole, 1H-tetrazole, 5-amino-1H-tetrazole, -Methyl-1H-tetrazole, 1-methyl-5ethyl-tetrazole, 1-methyl-5-mercapto-tetrazole, 5 (2-aminophenyl) 1H-tetrazole, 1-cyclohexyl-
5-mercapto-tetrazole, 1-phenyl-5-mercapto-tetrazole, 1-carboxymethyl-5
Tetrazole compounds such as mercapto-tetrazole and 5-phenyl-1H-tetrazole, 3-methyl-5
-At least one kind from the group consisting of pyrazolone and the like can be used. As a freezing point depressant, for example,
Polyhydric alcohols such as ethylene glycol, propylene glycol, glycerin, and polyethylene glycol;
Cellosolves, carbitols, urea and the like can be mentioned.

The composition for water for fire extinguishing can be used for fire extinguishing by using a standard fire extinguisher in the same manner as a general fire extinguishing method, but the composition for water for fire extinguishing adjusted to a high concentration in advance is used. It is sometimes desirable to use it after diluting it to a predetermined concentration with water.

[0025]

The present invention will be described below in detail with reference to examples. The present invention is not limited by these examples. In the following examples, the temperature-sensitive thickening temperature indicates a temperature at which the viscosity of the fire-extinguishing water starts to increase with increasing temperature, and the temperature-sensitive gelling temperature indicates a temperature at which the viscosity exceeds 10,000 mPa · s. Further, unless otherwise specified,% represents% by weight.

Production Example-1: Production of Thermosensitive Polymer A Deionized water 7 was placed in a 1 L glass separable flask.
25 g, N-isopropylacrylamide (NIPA
M) 108.2 g and acrylic acid (AAc) 17.2 g were added, and the monomer aqueous solution was dissolved with stirring. There 4
An 8% aqueous sodium hydroxide solution was gradually added to adjust the pH of the solution to 7.2, and a neutralization operation was performed to prepare a 15% aqueous monomer solution. The monomer preparation was placed in a thermostatic bath controlled at 20 ° C., and nitrogen gas was bubbled and deaerated while stirring with a magnetic stirrer. One hour later, 4.628 g of a 6% aqueous solution of N, N, N ', N'-tetramethylethylenediamine (TEMED) as a polymerization initiator and 4.5% aqueous solution of ammonium peroxodisulfate (APS) 4.5
44 g were sequentially added, and the polymerization reaction was started at 20 ° C.
After 20 minutes, stop stirring and nitrogen gas, and in a sealed stopper,
The polymerization reaction was performed at room temperature for 16 hours. After completion of the polymerization, the obtained polymer was cut, dried with hot air at 100 ° C., and then pulverized to obtain 120 g of a thermosensitive polymer A having a particle diameter of 1 mm or less. The resulting 1% aqueous solution of thermosensitive polymer A has a Brookfield viscosity of 760 mP at 25 ° C.
a · s. The Brookfield viscosity of an aqueous solution containing 1% of temperature-sensitive polymer A and 1% of potassium acetate is as follows:
It is 185 mPa · s at 25 ° C., and the temperature-sensitive thickening temperature is 7
The temperature was 0-75 ° C, and the temperature-sensitive gelling temperature was 90-95 ° C.

Production Examples 2 to 7: Production of Thermosensitive Polymers BG The thermosensitive polymers BG were the same as in Production Example 1 with the monomer composition, concentration and polymerization initiation temperature shown in Table 1. And manufactured. Table 2 shows the viscosities of the obtained temperature-sensitive polymers BG in 1% aqueous solutions, the viscosities of mixed solutions prepared by coexisting with 1% of potassium acetate, temperature-sensitive thickening temperatures, and temperature-sensitive gelling temperatures.
It writes in.

[0028]

[Table 1]

[0029]

[Table 2]

Examples-1 to 8: Preparation of fire extinguishing water composition The fire extinguishing water composition of the present invention was prepared according to the composition shown in Table 3. For example, the composition for fire extinguishing water A-6 is made of tap water 75
0 g of potassium acetate was placed in a 1 L beaker.
g, 50 g of potassium bicarbonate, 50 g of potassium tetraborate, and 100 g of temperature-sensitive polymer A, and were prepared by stirring and uniformly dissolving.

[0031]

[Table 3]

Preparation of fire extinguishing water Table 4 shows the components and concentrations of the fire extinguishing water using the fire extinguishing water composition of the present invention. Table 5 shows the compositions of fire-extinguishing water and 10 prepared for comparison.

[0033]

[Table 4]

[0034]

[Table 5]

Test Example 1: Wood fire extinguishing test A wood fire extinguishing test was carried out using water for fire extinguishing. That is, fire extinguishing water was charged into a water fire extinguisher (Hatsuta Seisakusho, injection nozzle diameter 2 mmφ), and the internal pressure of the fire extinguisher was increased to 7 kgf / cm ² using compressed air. And 3cm square,
The turrets, each 50 cm long, are made up of five pine lumbers, igniting a 15-tiered turret in a grid pattern, and after the turret is in a state of total combustion, fire extinguishing water is blown out from a fire extinguisher. went. The test was conducted 10 times under the same conditions according to a ministerial ordinance that stipulates the technical specifications of fire extinguishers. The average time (seconds) required from the start of water discharge to the extinguishing of fire and the average amount of fire extinguishing water used (kg) Was calculated, and the integrated value was used as the fire extinguishing water extinguishing efficiency. In addition, comparative evaluation was performed based on the presence / absence of re-ignition after fire extinguishing and the situation of fire extinguishing. Table 6 shows the results. In addition, "fire extinguishing impossible" described in the table indicates that the fire could not be extinguished even after 2 minutes (Table 7).
The same).

[0036]

[Table 6]

Test Example 2: Tempura oil fire extinguishing test A tempura oil fire extinguishing test was carried out using water for fire extinguishing. That is, 500 mL of soybean oil was placed in a wok of 25 cm in diameter and 7.5 cm in depth, heated and ignited with a gas colon, and when the oil temperature reached 400 ° C., 300 mL of water for fire extinguishing was used.
They were put into a stainless steel mug with a memory capacity and a handle, and they were thrown in all at once to start fire extinguishing. Then, the amount of fire extinguishing water used was measured from the time immediately after introduction to the time when the fire was extinguished. Further, the state of the flame during fire extinguishing was observed, and the state of the fire extinguishing water after fire extinguishing was compared. The results are shown in Table 7.

[0038]

[Table 7]

[0039]

The fire-extinguishing agent and the fire-extinguishing water composition of the present invention are all water-soluble and have substantially no drawbacks such as inability to use fire-extinguishing equipment due to blockage of fire-extinguishing equipment by discharging water.・ Can be restarted. After the fire is extinguished, if the equipment is washed with water, it can be used immediately.

The fire-extinguishing agent and the fire-extinguishing water composition of the present invention include:
A natural water source such as normal water, river water or seawater can be used, and the fire extinguishing performance does not decrease due to a change in water quality hardness in the area, so that it is possible to cope with a fire in a wider area.

The fire-extinguishing agent and the fire-extinguishing water composition of the present invention include:
Fire extinguishing effect for small fires such as A fire, B fire, C fire, tempura oil fire, steep kerosene fire, tire fire, car fire, and excellent fire extinguishing performance for large scale fires. Show. Particularly, in areas with few water sources, for example, when large-scale fires such as forest fires, mountain fires, grassland fires, post-earthquake fires, oil fires occur, when spraying from the air by helicopter, small airplane, etc. Due to its viscosity, it can be scattered and can be dropped on the target fire extinguishing point / fire extinguishing line. In addition, the firefighting water sprayed sufficiently adheres to and spreads on trees and the like, and furthermore, since there is no water damage, there is no need for repeated spraying, and the firefighting effect and power are more remarkably exhibited.

When the fire-extinguishing water composition of the present invention is sprayed toward a fire source, it falls and adheres to each surface of the burning material, covering the burning material and increasing the amount of water taken up by the combustion heat. Because it can be viscous or gelled, water cannot escape, and as a result, almost all of the fire extinguishing water stays at the center of the flame, extinguishing fire power over a long period of time, and extinguishing fire efficiently with a small amount of water Can be implemented. In addition, there is no need for continuous water discharge, and generally required manpower and material resources can be minimized. In addition, it has a remarkable effect in preventing secondary disasters caused by water in a fire.

Since the fire-extinguishing water composition of the present invention forms a highly water-containing thickened or gelled state after being coated on the surface of the combustible, the water removes heat from the surface, thereby causing the flame to ignite. Until the fire falls below the point and the fire is extinguished, the cooling action by the evaporation of water continues. The formation of this gelling layer cuts off the supply of oxygen required for combustion and thus has the effect of choking the flame. In addition, it has the effect of preventing the spread of fire to surfaces that have not yet ignited near the flame,
When the so-called unignited surface is covered with a gelling layer, it plays an important role in preventing the spread of fire, which cuts off the chain reaction of combustion, and provides a large fire extinguishing power and fire prevention power. Combustion prevention and water loss suppression can be achieved.

Claims (12)

[Claims] 1. A fire extinguisher comprising a temperature-sensitive polymer and potassium salts. 2. The method according to claim 1, wherein the temperature-sensitive polymer is soluble in a potassium salt aqueous solution at a certain concentration at a temperature lower than a specific set temperature and thickens or gels at a temperature higher than the set temperature. Fire extinguisher. 3. The method of claim 1, wherein the specific set temperature of the temperature-sensitive polymer is 4
The fire extinguisher according to claim 2, which is at 0 to 100 ° C. 4. A 1% by weight aqueous solution of a temperature-sensitive polymer,
The fire extinguisher according to any one of claims 1 to 3, having a viscosity of 00 to 10,000 mPa · s (25 ° C). 5. A fire extinguishing water composition comprising a thermosensitive polymer, potassium salts and water. 6. The fire extinguishing water composition according to claim 5, wherein the amount of the thermosensitive polymer added is 0.1% by weight or more. 7. The amount of potassium salt added is 0.2% by weight.
The fire extinguishing water composition according to claim 5, which is the above. 8. A method for preparing a fire-extinguishing water composition comprising a temperature-sensitive polymer, potassium salts and water, comprising dissolving the temperature-sensitive polymer and potassium salts in water. 9. A temperature-sensitive polymer, characterized in that a vinyl monomer is polymerized in an aqueous solution in the presence of a potassium salt,
A method for preparing a fire extinguishing water composition containing potassium salts and water. 10. A fire extinguishing method using the fire extinguishing agent according to claim 1. Description: 11. A fire extinguishing method, comprising using the fire extinguishing water composition according to claim 5. Description: 12. The fire extinguishing method according to claim 11, wherein the fire-extinguishing water composition adjusted to a high concentration is diluted to a predetermined concentration with water before use.