JPH10211296A - Chemical fire extinguisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide one-liquid type water based chemical fire extinguisher which is eliminated any possibility of reducing its viscosity, if dissolved in water and stored for a long time by using a polymerzate of ammonium phosphate or ammonium condensed phosphate with a polymerizable double bond- containing compound as an effective component. SOLUTION: For example, a liquid mixture of approximately 100 pts. of approximately 40% ammonium condensed phosphate solution and approximately 5.5 pts. of acrylic acid is mixed with a polymerization initiator and copolymerized so that transparent viscous liquid can be prepared. This is set to one-liquid type water based chemical fire extinguisher. Its viscosity is approximately 120cPs by the measurement of a B type viscometer at the temperature 25 deg.C. When this chemical fire extinguisher is stored in a thermostat of approximately 40 deg.C for approximately two months and surveyed on the time course of the viscosity in the same by the B type viscometer, long-term keeping quality can be confirmed with no change in the viscosity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel one-pack type water-based chemical fire extinguishing agent.

[0002]

2. Description of the Related Art When extinguishing a forest fire, a spreading agent (thickener), which is a water-soluble polymer compound such as a starch-based, gum-based or synthetic system, is usually added to water together with a fire extinguisher and a colorant. The dissolved chemical extinguishing agent is sprayed from a helicopter or the like.
Of course, the chemical fire extinguishing agent is required to have excellent fire extinguishing performance, but it is also essential that the chemical extinguishing agent has a certain degree of viscosity. If the viscosity is as low as water, even when sprayed from a helicopter, the fire extinguishing agent does not adhere to the fire extinguishing target, such as trees and leaves, and the fire extinguishing performance is not exhibited. Therefore, the above-mentioned spreading agent (thickening agent) is added to the chemical fire extinguishing agent. On the other hand, fire extinguishing work requires urgency,
If a fire extinguisher, a coloring agent, a spreading agent, and the like are dissolved in water and stored in advance, the time required for preparing a chemical fire extinguisher at the time of fire extinguishing can be eliminated, and a quick response can be made.

[0003]

However, if a current fire extinguishing agent represented by ammonium phosphate or condensed ammonium phosphate is dissolved in water together with a coloring agent, a spreading agent and the like, it can be stored for a long period of one month or more. If it does, there is a fault that it becomes unnecessary as a chemical fire extinguisher. For example, when a starch-based polymer compound is used as a spreading agent, the viscosity of the compound decreases due to aging of the compound. Further, when a synthetic polymer compound such as polyacrylamide, sodium polyacrylate, acrylamide / dimethylaminoethyl acrylate / methyl chloride quaternary salt copolymer is used as a spreading agent, for example, it may aggregate or separate into two layers. Would. An object of the present invention is to provide a novel one-part type water-based chemical fire extinguishing agent which does not cause a decrease in viscosity even when dissolved in water and stored for a long period of time.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an aqueous chemical fire extinguishing agent containing, as an active ingredient, a polymer of ammonium phosphate or condensed ammonium phosphate and a compound containing a polymerizable double bond. According to the present invention, the performance of ammonium phosphate or condensed ammonium phosphate as a fire extinguishing agent is reduced by polymerizing ammonium phosphate or condensed ammonium phosphate with a polymerizable double bond-containing compound such as acrylic acid. Even when stored for a long period of time, there is no decrease in viscosity, aggregation or separation. Further, the polymer of ammonium phosphate or condensed ammonium phosphate, which is an active ingredient of the chemical fire extinguishing agent of the present invention, and a polymerizable double bond-containing compound has much better water solubility than conventional fire extinguishing agents, and is promptly dissolved in water. It also has the property of being uniformly dissolved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the water-based fire extinguisher of the present invention,
A polymer of ammonium phosphate or condensed ammonium phosphate and a polymerizable double bond-containing compound (hereinafter collectively referred to as “polymer” unless otherwise specified) is used as an active ingredient. However, from the standpoint of fire extinguishing performance and viscosity stability, a polymer of a condensed ammonium phosphate and a polymerizable double bond-containing compound is more preferable. The above polymer can be produced, for example, by reacting ammonium phosphate or condensed ammonium phosphate with a polymerizable double bond-containing compound in the presence of a polymerization initiator.

As the condensed ammonium phosphate, known ones can be used. For example, a condensed ammonium phosphate obtained by a condensation reaction between orthophosphoric acid or ammonium monophosphate and urea, a condensation reaction between phosphoric anhydride and ammonium And the like. Also, the degree of condensation of the condensed ammonium phosphate is not particularly limited, but considering its solubility and flame retardancy, etc.
Usually, it should be about 3 to 150, preferably about 5 to 100. Commercial products can also be used as the condensed ammonium phosphate. Further, a solution obtained by dissolving condensed ammonium phosphate in water or the like can be used, and examples thereof include an aqueous solution marketed under the trade name of "Fr S" (manufactured by Otsuka Chemical Co., Ltd.). .

Known compounds can be used as the polymerizable double bond-containing compound, and examples thereof include olefins. Specific examples of the olefins include, for example, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid, and vinyl group-containing compounds such as vinyl acetate and divinylbenzene. Also,
Methyl (meth) acrylate, ethyl (meth) acrylate and the like, wherein the alkyl moiety is a linear or branched alkyl group having about 1 to 4 carbon atoms, (meth) acrylic acid alkyl ester, halogen atom on benzene ring And (meth) acrylates such as phenyl (meth) acrylate, which may have one or more substituents such as an alkyl group, an alkoxy group, and a hydroxyl group. Further, (meth) acrylamide, acrylonitrile, vinyl chloride, vinylidene chloride, styrene and the like can be used. Among these, (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylic acid amide and the like are preferable, and acrylic acid, acrylic acid amide and the like are particularly preferable. The amount of the polymerizable double bond-containing compound is not particularly limited and can be appropriately selected from a wide range. Usually, about 1 to 1,000 parts by weight, preferably about 100 parts by weight of ammonium phosphate or condensed ammonium phosphate, preferably The amount may be about 5 to 500 parts by weight, more preferably about 10 to 50 parts by weight. The viscosity of the finally obtained chemical fire extinguisher of the present invention can be appropriately adjusted by changing the amount of the polymerizable double bond-containing compound used.

The polymerization initiator is not particularly limited, and is not particularly limited as long as it can be dissolved or dispersed in water or a mixed solvent of water and an organic solvent. Examples thereof include hydroxy peroxides such as cumene hydroxy peroxide. And water-soluble potassium peroxosulfate, ammonium peroxosulfate, hydrogen peroxide, azobisisobutyronitrile, azobiscyclohexanecarbonyl and the like.
Among them, azobisisobutyronitrile and the like are preferable. The polymerization initiator is used alone or in combination of two or more. The amount of the polymerization initiator used is not particularly limited,
Although it can be appropriately selected from a wide range, the polymerization initiator is usually used in a ratio of about 0.01 to 5% by weight, preferably about 0.05 to 1% by weight, based on the polymerizable double bond-containing compound. Good. The copolymerization reaction between ammonium phosphate or condensed ammonium phosphate and a polymerizable double bond-containing compound is usually performed in water in the presence of a polymerization initiator. At this time, the concentration of ammonium phosphate or condensed ammonium phosphate in the solvent is not particularly limited and can be appropriately selected from a wide range, but is usually about 1 to 70% by weight, preferably about 10% by weight.
It may be about 50% by weight. This polymerization reaction is usually performed at a temperature of about 50 to 90 ° C., preferably about 70 to 80 ° C., and usually for about 20 to 120 minutes, preferably
It ends in about 0 to 60 minutes. The aqueous solution containing the polymer thus obtained can be used as it is as the chemical fire extinguisher of the present invention. Alternatively, the polymer may be isolated according to ordinary separation means such as filtration and drying, and then used after dissolving it in water. The concentration of the polymer in the chemical fire extinguisher of the present invention is not particularly limited, and can be appropriately selected from a wide range. I just need. Further, in the chemical fire extinguisher of the present invention, as long as its performance is not impaired, conventionally used additives, for example, coloring agents,
A spreading agent or the like may be included.

[0009]

The present invention will be specifically described below with reference to examples and comparative examples. In the following, "part" and "%"
“A” means “parts by weight” and “% by weight” unless otherwise specified.

Example 1 Aqueous solution of 40% condensed ammonium phosphate (condensation degree: 4 to
10) A polymerization initiator (trade name: ACVA, manufactured by Otsuka Chemical Co., Ltd.) in a mixture of 100 parts and 5.5 parts of acrylic acid is 0.0.
28 parts were added and copolymerized at 80 ° C. for 2 hours to produce a viscous transparent aqueous solution. It showed a viscosity of 120 cps with a Brookfield viscometer (Rotor No. 2, 60 rpm) at 25 ° C. and a pH of 6.7.

Example 2 In a mixture of 100 parts of an aqueous solution of 40% condensed ammonium phosphate and 5 parts of acrylamide used in Example 1, a polymerization initiator [ACVA] (trade name, manufactured by Otsuka Chemical Co., Ltd.) was used. .0
28 parts were added and copolymerized at 80 ° C. for 2 hours to produce a viscous and transparent aqueous solution of the present chemical fire extinguisher. B-type viscometer at 25 ° C. (Rotor No. 2, 60 rpm
m) showed a viscosity of 126 cps and a pH of 7.5.

Example 3 The chemical fire fighting of the present invention was carried out in the same manner as in Example 1 except that a 40% aqueous solution of ammonium monophosphate was used instead of the aqueous solution of 40% condensed ammonium phosphate used in Example 1. An agent was manufactured. B-type viscometer (rotor No.
It exhibited a viscosity of 150 cps at 2,60 rpm) and a pH of 6.7.

Example 4 The procedure of Example 1 was repeated, except that the amount of acrylic acid was changed to 6.3 parts and the amount of the polymerization initiator was changed to 0.032 parts. The chemical extinguishing agent of the present invention was produced. B-type viscometer at 25 ° C. (Rotor No. 2,
It shows a viscosity of 260 cps at 60 rpm) and a pH of 6.5.
Met.

Comparative Example 1 99 parts of the aqueous solution of 40% condensed ammonium phosphate used in Example 1 was mixed with 1 part of polyacrylamide (nonionic water-soluble polymer, MW 2,000,000) to give a viscosity of 128 cp.
A viscous, clear aqueous solution having a pH of 7.0 was prepared.

Comparative Example 2 The procedure of Comparative Example 1 was repeated, except that sodium polyacrylate (anionic polymer, MW 8 million) was used instead of polyacrylamide.
A viscous clear aqueous solution of 8 was prepared.

Comparative Example 3 A viscosity was measured in the same manner as in Comparative Example 1 except that acrylamide / dimethylaminoethyl acrylate / methyl chloride quaternary salt copolymer (cationic polymer, MW 5,000,000) was used instead of polyacrylamide. 120 cps, pH 7.
A viscous clear aqueous solution of 8 was prepared.

Test Example 1 The chemical fire extinguishants obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were stored in a thermostat at 40 ° C. for 2 months, and the changes over time in the viscosity were examined. A B-type viscometer (Rotor No. 2, 60 rpm) was used for measuring the viscosity (cps). Table 1 shows the results.

[0018]

[Table 1]

As is clear from Table 1, the chemical fire extinguisher of the present invention (Examples 1 to 4) maintains a constant viscosity even after long-term storage, and is excellent in viscosity stability. On the other hand, Comparative Example 1
Nos. 3 to 3 are water-based fire extinguishing agents in which a conventional spreading agent (a nonionic, cationic or anionic water-soluble polymer compound) is dissolved together with a fire extinguishing agent. It turns out bad. The chemical fire extinguisher of the present invention had a fire extinguishing performance equal to or higher than that of the conventional chemical fire extinguisher of Comparative Examples 1 to 3 at the time of preparation.

[0020]

According to the present invention, ammonium phosphate or condensed ammonium phosphate and a polymerizable double bond-containing compound such as acrylic acid are polymerized to form a fire extinguishing agent for ammonium phosphate or condensed ammonium phosphate. Even if stored for a long period of time without lowering the performance, no reduction in viscosity, aggregation or separation occurs. Further, the polymer of ammonium phosphate or condensed ammonium phosphate, which is an active ingredient of the chemical fire extinguishing agent of the present invention, and a polymerizable double bond-containing compound has much better water solubility than conventional fire extinguishing agents, and is promptly dissolved in water. It also has the property of being uniformly dissolved.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazunori Fukumura 463 Kagasuno, Kawauchi-cho, Tokushima City, Tokushima Prefecture Inside the Tokushima Plant of Otsuka Chemical Co., Ltd.

Claims (2)

[Claims] An aqueous chemical fire extinguishing agent comprising, as an active ingredient, a polymer of ammonium phosphate or condensed ammonium phosphate and a polymerizable double bond-containing compound. 2. The polymerizable double bond-containing compound is (meth)
Acrylic acid, (meth) acrylic acid ester and (meth)
The aqueous chemical fire extinguisher according to claim 1, which is at least one selected from acrylamide.