JPS59194759A - Aerosol type simple fire extinguishing tool - 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] Aerosol type simple fire extinguishers have recently attracted attention because they have the following advantages: (1) They can be easily handled in a small and light carrier, and (2) There is no need to approach the fire source directly to extinguish the fire. .

However, in order to create such characteristics, the fire extinguishing performance, which is the original purpose of the fire extinguisher, is sacrificed to some extent, and the actual situation is that it is inferior to other ordinary fire extinguishers. Table 1 shows the characteristics of commonly used aerosol fire extinguishers.

In Table 1, ○ indicates suitable, × indicates unsuitable, and △ indicates normal. Halon-based fire extinguishing equipment refers to fire extinguishing equipment that uses halon-based compounds such as dibromotetrafluoroethane and promotrifluoromethane. say.

As shown in Table 1, simple aerosol fire extinguishers made of aerosolized halon yarn are not suitable for tempura oil fires.

In the case of water-based fire extinguishers, it is somewhat difficult to convert the active ingredients used in the powder thread into aerosol with the aerosol-type 1 m fire extinguisher, and although it is effective against tempura oil fires, there are some fires that are unsuitable for it. It does not have sufficient performance for titration.

It has been considered to combine the active ingredients used in each of the above-mentioned simple aerosol fire extinguishing devices to create a fire extinguishing device that has the advantages of each of them, but so far nothing has been found to be effective.

In view of the above-mentioned circumstances, the inventors of the present invention have conducted extensive research to create a simple halon-based aerosol fire extinguisher that is effective against tempura oil fires.As a result, (a) 15 to 40 parts of bicarbonate of soda; (parts by weight, the same applies hereinafter), (b) 0.2 to 2.5 parts of finely powdered silica, (0) 55 to 80 parts of dibromotetrafluoroethane, and (d) 5 to 20 parts of nonflammable liquefied gas.
By creating a simple aerosol type fire extinguishing device using a fire extinguishing agent consisting of We have created a simple halon-based aerosol fire extinguisher that has good fire extinguishing performance even when
This invention has been completed.

The bicarbonate of soda used in the present invention has a particle size of about 30 to 100
μm is preferred. When the particle size of bicarbonate soda is larger than about 100 μm, the spray becomes thick and the particle size becomes about 30 μm.
If the size is smaller, it will be easier to scatter when sprayed, resulting in slightly inferior fire extinguishing performance. The proportion of bicarbonate of soda per 100 parts of the active extinguishing agent is preferably about 15 to 40 parts; if the proportion is less than about 15 parts, the effect against tempura oil fires will be small, and if it is more than about 40 parts, it will be less effective against other automobiles. Not only will it be less effective against fires such as fires (fires in the engine room of cars), but it will also not be possible to change the injection appropriately. A portion of bicarbonate of soda with other metal salts of the same type,
For example, it may be replaced with potassium carbonate, talc, etc. However, it is preferable to use only sodium bicarbonate for reasons such as not corroding the container of the fire extinguisher.

In the present invention, finely powdered silica is used to improve the fluidity of powders such as bicarbonate of soda and the quality stability of extinguishing agents used in simple aerosol fire extinguishers, and in particular to prevent agglomeration of powder components used as extinguishing agents due to long-term storage. Ru.

This is because adding finely powdered silica to inebriated soda bicarbonate improves the fluidity of the powdered soda bicarbonate, making it easier to handle. When dispersing halon-based compounds, the sedimentation volume is larger than when dispersing substances such as bicarbonate of soda, making it difficult to form solid agglomerates, so even if stored for a long period of time, there will be no problem with spraying due to clogging. This is because it becomes difficult to trigger.

The fine powder silica used in the present invention is a synthetic silica with a particle size in the μm unit, such as Aerosil (Nippon Aerosil (trade name, manufactured by Kiki)), which is obtained by a dry method of combustion hydrolyzing silicon tetrachloride in a gas phase. Silicate with acid or OO
Mizukashiru (manufactured by Suihan Kagaku Kogyo tel, trade name) and Thyroid (manufactured by Fuji Davison Chemical Association, trade name) obtained by gelation of silicic acid obtained by the floating method, which is decomposed in step 2, can be opened. . As mentioned above, these finely powdered silicas are sufficiently effective in improving the fluidity of powders such as sodium bicarbonate and the agglomeration resistance when the powders are dispersed in halon-based compounds. .

Table 2 shows typical finely powdered silica produced by the above synthesis method.

Table 2 Among the above-mentioned fine powder silicas, particularly preferable fine powder silicas for use in the present invention are those obtained by gelation of silicic acid, and have a surface area of about 500 to 1000 m2 / It belongs to y. The true specific gravity of fine powdered silica obtained by gelling silicic acid is approximately 2.
15, which is close to the true specific gravity of sodium bicarbonate of about 2.2, making it easy to mix powders together and making the mixture stable, which is also preferred from this point of view.

The proportion of the finely powdered silica in 100 parts of the active ingredient of the fire extinguisher is preferably about 0.2 to 2.5 parts, and the proportion is about 0.2 to 2.5 parts.
If the amount is less than 2 parts, the fluidity of the powder and the agglomeration resistance during dispersion will not be sufficient, and if the amount exceeds 2.5 parts, not only will the effect not be changed, but the extinguishing agent will gel. and becomes unable to inject.

Dibromotetrafluoroethane used in the present invention has very high fire extinguishing performance and good compatibility with sodium bicarbonate, etc., and can be stored for a long time [1-u] by mixing with sodium bicarbonate etc. in the presence of finely powdered silica. It is sufficiently stable both chemically and physically. Instead of dibromotetrafluoroethane, other halon-based compounds or fluorocarbons, such as haplomoform or trichlorotrifluoroethane, may be used, but if dibromotetrafluoroethane is used, it will not extinguish the fire when a fire extinguishing agent is injected. It is desirable to use dibromotetrafluoroethane, which is less likely to leave powder components such as sodium bicarbonate at the bottom of the filling container, and which improves fire extinguishing performance. The proportion of the active ingredient in a fire extinguishing agent such as dibromotetrafluoroethane is preferably about 55 to 80 parts per 100 parts. If the proportion is less than about 55 parts, the extinguishing performance will not be sufficient, and if the proportion exceeds about 80 parts, the Ip component will be relatively low and it will not be possible to spray properly, and the extinguishing performance against tempura oil fires will not be sufficient. I'm going to have a summer vacation.

Examples of the nonflammable aqueous gas used in the present invention include promotrifluoromethane, dichlorodifluoromethane, chlorodifluoromethane, and bromochlorodifluoromethane, which may be used alone or in combination of two or more. good. Among them, bromo l-'J fluoromethane is particularly preferred because it can inject a fire extinguishing agent and also has fire extinguishing performance. The ratio of the nonflammable liquefied gas to 100 parts of the active ingredient of the fire extinguisher is preferably about 5 to 20 parts; if the ratio is less than about 5 parts, the fire extinguisher cannot be injected normally; If it exceeds the amount, other components will decrease and the fire extinguishing performance will decrease.

The fire extinguishing tool of the present invention is produced by filling a container used for a normal aerosol fire extinguishing tool with the above-mentioned fire extinguishing agent components and, if necessary, other components in predetermined proportions by a normal method.

Next, the fire extinguisher of the present invention will be explained in detail using Examples and Comparative Examples.

Examples 1 to 16 and Comparative Examples 1 to 17 Internal volume approximately 350 m1! An aluminum aerosol container is filled with a powder whose fluidity has been improved by mixing soda bicarbonate with a particle size of 40 to 80 μm and finely powdered silica in the proportions shown in Table 1, and then filled with dibromotetrafluoroethane. The valve for the aerosol fire extinguisher was installed and sealed. After sealing, fill nonflammable liquefied gas through the stem of the aerosol type simple fire extinguisher valve and attach the spout, totaling 11,480 yen of extinguishing agent. I made a simple aerosol type fire extinguisher.

Using the obtained fire extinguishing equipment immediately after manufacture, we tested tempura oil, curtains,
The fire extinguishing performance was measured for six types of fires: cushions, waste baskets, kerosene stoves, and automobiles. The results are shown in Table 1.

In Table 1, ○ indicates good fire extinguishing performance, and × indicates poor fire extinguishing performance.

On the other hand, the obtained fire extinguishing equipment was quietly stored at a constant temperature of 45°C for 6 months, and then gently cooled to oOo and a fire extinguishing agent was injected into it. Thereafter, the remaining amount of extinguishing agent was measured and the ratio to the initial filling amount was determined. The results are shown in Table 1. In Table 1, ◎ means that the injection residual m'' is less than 0.10, ○ means that the injection residual m'' is 0.10 or more and o, less than 13, △ means that the injection residual m'' is 0.13 or more and less than 0.15, and × means that the injection residual m'' is 0.15 or more. shows.

Regarding the container stability of the obtained fire extinguisher, the fire extinguisher was evaluated as being good (non-reacting) and poor (reacting).

The overall evaluation of the fire extinguishing equipment obtained is that the fire extinguishing performance is good against the above six types of fires, the residual injection amount is less than 0.10 and the container stability is good, and the container stability is poor. △,
Others are indicated as ×. This is because emphasis was placed on the fire extinguishing performance 8, which is the original performance of the fire extinguisher, and the remaining amount of injection, which greatly affects the fire extinguishing performance. Containers with a large amount of remaining spray have a correspondingly poor extinguishing performance, and long-term storage can cause bicarbonate of soda to aggregate, resulting in fatal defects. Container stability is dependent on the container material. This is to improve the culm quality and increase the vine strength.

In addition, 72pole 60 and nonipole 100 in Table 1
is a surfactant manufactured by Sanyo Chemical Industries, Ltd.

Example 17 An aluminum aerosol container with a volume of about 350 m6 was filled with 295 f of dibromotetrafluoroethane.
I was further charged. The valve for the aerosol fire extinguisher was installed and sealed. After sealing, add 60% promotrifluoromethane through the stem of the aerosol fire extinguisher valve.
A simple aerosol type fire extinguisher was made by filling with g and attaching a spout.

The resulting fire extinguisher is effective against the six types of fires listed in the criteria for evaluating simple aerosol fire extinguishers, can be used under any conditions without any remaining spray, and has good storage stability over a long period of time. And one.

Example 18 120y of sodium bicarbonate having a particle size of 40 to 80 μm and 57 of Thyroid 63 were separately charged into an aluminum aerosol container having a volume of about 330ml, and then 250y of dibromotetrafluoroethane was added. , I, 50 y of bromochlorodifluoromethane and 25 y of bromotrifluoromethane k. A simple aerosol type fire extinguisher was manufactured by installing a valve for the aerosol type fire extinguisher and sealing it, and installing a spout.

Immediately after making a fire extinguishing tool, use a hand trowel 10 to 20 times.
It can be used sufficiently if it is only used as a fuel, and there is no residual amount of spray even under the conditions described above, and it is effective against the six types of fires mentioned above. Moreover, it has good storage stability over a long period of time. there were.

From the results shown in Table 6, it can be seen that the fire extinguisher of the present invention has good extinguishing performance, has a small amount of remaining spray, and has sufficient performance as a fire extinguisher.

In other words, by using finely powdered silica, it is possible to create a fire extinguishing tool with less residual spray by adding sodium bicarbonate to a halon-based fire extinguishing agent using dibromodetrafluoroethane to a certain extent that is suitable for tempura oil fires. . Furthermore, from the results in Table 3, the effects of fine powder silica vary depending on its type.
It turns out that this is particularly preferable.

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Claims (1)

[Claims] 1(a) 15 to 40 parts by weight of heavy carbonated soda,
(b) Finely powdered silica 0.2-2.5N parts, (0) Dibromotetrafluoroethane
A simple aerosol type fire extinguisher using a fire extinguishing agent consisting of 55 to 80 N@parts and ((1) 5 to 20 small parts of nonflammable liquefied gas. 2. A patent claim in which the fine powdered silica is obtained by gelling silicic acid. Fire extinguishing equipment as described in item 1.