JPS622973A - Fire extinguishing liquid for sky fire extinguishment of forest fire - 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 (Field of Industrial Application) The present invention relates to an aerial extinguishing liquid for forest fires such as wildfires and forest fires. More specifically, the present invention relates to a fire extinguishing liquid for aerial fire extinguishing, which contains carboxymethyl hydroxyethyl cellulose (hereinafter abbreviated as CM HE C) as a thickener and has an excellent extinguishing effect against forest fires and the like.

(Conventional technology and intermediate points) In recent years, fires in forest areas such as forests, bushes, bushes, mountains and fields have been increasing, causing enormous damage, and valuable wood resources are being lost. In addition, private homes, business buildings, and even precious human lives are often lost. Unlike urban fires, forest fires are often located in remote locations and lack sufficient fire extinguishing equipment.The general method for extinguishing forest fires is to transport large flexible container bags to the fire point and use seawater, municipal water, etc. It is known that an effective aerial fire extinguishing method involves dissolving a fire extinguishing agent using lake water or general water, and then spraying a fire extinguishing liquid from the air using a helicopter, flying boat, or the like.

The fire extinguishing liquid used for such aerial fire extinguishing can be quickly dissolved and prepared when a fire occurs, has an appropriate viscosity, prevents scattering when sprayed in the air, and has a ratio of 11:1 to prevent it from falling to the target location. 8 Sodium is a substance that adheres to and spreads on trees and suppresses the evaporation of water in the fire extinguishing liquid. Therefore, it is essential to add a thickener to increase viscosity to an aqueous solution in which a fire extinguishing agent such as ammonium phosphate, which is the main ingredient, is dissolved in the fire extinguishing fluid.

As a thickener for such a purpose, carboxymethyl cellulose putrium salt (J3J, hereinafter abbreviated as CMc) has been mainly used. However, CMC, which is most commonly used as a thickener, has poor compatibility with salts such as ammonium phosphate, which are extinguishing agents, and has a major problem in that the viscosity of the extinguishing fluid decreases significantly when it coexists with salts. Therefore, there was a drawback that a sufficient thickening effect could not be obtained.

(Means for Solving the Problems) In order to solve these problems, the inventors of the present invention have worked hard to solve these problems, and have developed a thickened fire extinguishing liquid for aerial fire extinguishing, which is made by dissolving ammonium phosphate base in water. It was discovered that by using CMHE C as an agent, it has high viscosity, good compatibility with extinguishing agents, and does not cause a decrease in viscosity even when mixed with ammonium phosphate salts or seawater, and has developed the present invention. I have reached the point where I have completed the . That is, the present invention is a fire extinguishing liquid for aerial forest fire extinguishing characterized by containing carboxymethylcellulose. More specifically, (A) 100 parts by weight of water;
This is an extinguishing liquid for aerial forest fire extinguishing, consisting of (B) a fire extinguishing agent 1 to 30 parts and (C) a CM HE C051 to 10 heavy needle part as a thickener.

In the present invention, the extinguishing agent and 1- are ammonium phosphate-hydrogen (1) AP), cumulative ammonium phosphate dihydrate (MA
Extinguishing agents with high extinguishing effects that have been commonly used in the past, such as ammonium phosphate + 14 (P) and ammonium llitate, can be used alone or in combination. The amount is 1 to 30 parts by weight, preferably 5 to 20 parts by weight.If the extinguishing agent is less than 4 parts by weight, the extinguishing ability of the extinguishing liquid will not be sufficient.Also, if the extinguishing agent exceeds 30 parts by weight This is not preferable because it causes a decrease in the viscosity of the thickener.

CMTTEC used in the present invention can be prepared by a known method (
For example, U.S. Pat. No. 2,618,632, U.S. Pat.
46795, the method described in Japanese Patent Publication No. 4B-18586), cellulose was dissolved in alkali cellulose, hydroxyethylated with ethylene oxide, and then carboxymethylated by reacting with monochloroacetic acid to form CM)-I. EC. Alternatively, CM HE C can be obtained by carboxymethylating alkali cellulose with monochloroacetic acid and then reacting it with ethylene oxide to hydroxyethylate it. Note that the carboxymethyl group is in the form of an alkali metal salt, usually a sodium salt.

In addition, the viscosity of t7 suitable for extinguishing fluid for aerial forest fire extinguishing is:
The rate is usually 100 to 3,000 cps to prevent the extinguishing liquid from scattering too much when sprayed from the air. Therefore, in the present invention, the appropriate amount of CMHE C to be blended is 01 to 10 parts per 100 parts by weight of water.

If the proportion of CMITEC in the mixture is less than 0.11 parts by weight, sufficient viscosity cannot be imparted to the extinguishing liquid. Moreover, if the amount exceeds 10 parts by weight, the viscosity of the extinguishing liquid becomes too high, making uniform spraying impossible.

CM FT E C used in the present invention has a degree of substitution of tulboxymethyl group per glucose position (hereinafter abbreviated as DS of CM group) of 01 to 25, and a number of moles of substituted hydroxyethyl group per glucose unit. (hereinafter abbreviated as MS of I-IE group) is 01 to 7.0. If the I)S of the CM group is less than 01, the salt resistance will be poor, and the DS of the CM group will be 2.5.
The larger the size, the more difficult it is to manufacture. Also, I-T E
When the MS of the group is less than 01, the solubility in water is poor. When the MS of the T-TE group becomes thicker than 7.0, the substitution rate of ethylene oxide decreases significantly, resulting in poor water solubility. It's the economy.

Furthermore, the CM HE C of the present invention is a 1% aqueous solution at 25°C.
It is suitable that the viscosity is in the range of 10 cps or more and 8000 cps or less.

The following three methods can be used to prepare the fire extinguishing fluid of the present invention, which is composed of queen's water, fire extinguishing agent, and CMITEC. That is, the first method is to first mix and stir water and CM (EC) to create an aqueous solution of CMITEC, and then add a fire extinguisher to this and stir to dissolve.The second method is to
First, water and a fire extinguishing agent are mixed and stirred to form an aqueous solution of the fire extinguishing agent, and CM HE C powder is then added thereto and dissolved by stirring.

The third method is to mix a fire extinguisher and CM■-EC in powder form in advance and dissolve the mixture in water. Although it can be prepared by any method, the second method is preferable, in which a fire extinguishing agent is first added to water, mixed and stirred with a stirrer to prepare a water bath liquid of the fire extinguishing agent, and the rM T of the present invention is added to this.
It is Iu to dissolve T E C and add it to the fire extinguisher.
This is a good method. Note that the water used here is not limited to regular fresh water, but can also be seawater.

(Example) The present invention will be explained below with reference to Examples.

In addition, parts and % in the examples mean weight basis.

12 parts of monium was added and stirred using a stirrer until completely dissolved. After that, 1 part of CMIIEC (1% aqueous solution viscosity 860 cps) having 1) S of CM group is 0.45 and IS of ~IS of TfE group is 25 is added, stirred and dissolved until completely dissolved, and then dissolved with viscomonium. There was no decrease in viscosity (excellent thickening of the bed).
After being left for a month, the viscosity was measured and the results are shown in Table 1. There was almost no decrease in viscosity, the stability was t*I-f, and the transparency was poor.

This fire extinguishing liquid was sprayed on the leaves of the zelkova tree to test its adhesion (4).

Examples 2 to 10 As a thickener, 1)8 of each 1i14 CM group shown in Table 1
A fire extinguishing liquid was prepared in the same manner as in Example 1 using CMIIEC having MS of HE group.As a result, both had a high viscosity thickening effect, and the stability after 1 month was high. Good and transparent 1
Seven points were also excellent. In addition, fire extinguishing liquid was sprayed on the zelkova leaves.
As a result of 17 test screenings of the product, it received a rating of 1 (adhesiveness was excellent) with no dripping.

Comparative Examples 1 to 4 As a thickener, CMC having the DS of each type shown in the first layer was used, and a fire extinguishing liquid was mixed in the same manner as in Example 1.
In all cases, the thickening effect was poor, the viscosity decreased significantly after 1 month, and the transparent iz+ was also poor. In addition, extinguishing liquid exhibition 71
'1 quality was poor with severe sagging and almost no adhesion.

Claims (1)

[Claims] A fire extinguishing liquid for aerial forest fire extinguishing, characterized by containing carboxymethyl hydroxyethyl cellulose.