JPS6397178A - Fire extinguishing agent - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fire extinguishing agent 1, particularly a fire extinguishing agent that can effectively and easily extinguish vegetable oil such as tempura oil or frying oil when it ignites. be.

[Prior art] Vegetable oil used for tempura, frying, etc. has an ignition temperature of 300°C or higher, and in the event of a fire, the oil temperature will be around 410°C at most. It is.

Hitherto, several extinguishing agents such as powder have been proposed for fighting such fires, and some have been commercialized.

[Problems to be Solved by the Invention] However, these powder fire extinguishing agents have a drawback that even after extinguishing the oil, they are not effective in lowering the oil temperature below the ignition temperature, and therefore may re-ignite.

[Means for Solving the Problems] The present inventor has conducted various research and studies with the aim of eliminating such drawbacks, and finding a fire extinguishing agent that can extinguish vegetable oil fires effectively, reliably and quickly, and is easy to handle. As a result, it was found that the above object can be achieved by using silicon dioxide having specific physical properties and carbonate or heavy acid salt. Thus, the present invention provides a fire extinguishing agent whose main components are silicon dioxide and carbonate and/or bicarbonate having a water content of 80 to 20% by weight.

The silicon dioxide used in the present invention needs to have a water content of 80 to 20% by weight, and as a means to achieve this, silicon dioxide containing silanol groups is used.

□Such silanol groups are such that when silicon dioxide is heated to 100° C., 90% or more of the silanol groups are quickly decomposed and evaporated as water. As a method for producing such silicon dioxide, for example, a silica sol of a desired particle size is formed by a commonly used reaction between sodium silicate and sulfuric acid, and this is aged by a common method. In the next drying step, It is obtained by drying for a long time at a low temperature such as 20 to 60°C. As an example of the drying process, silicon dioxide with a water content of 55% by weight is first held at 60°C for 5 hours, then held at 40°C for 7 hours, then held at 35°C for 6 hours, and then slowly cooled. can be obtained.

By selecting the drying temperature and time in this manner, silicon dioxide having a desired moisture content can be obtained.

Of these water contents, it is particularly preferable to use a water content of 80 to 35% by weight because it allows stable fire extinguishing for effect fishing.

Further, it is appropriate that the average particle size of silicon dioxide used as a fire extinguishing agent is about 10 to 20 microns in an aggregated state.

Furthermore, these silicon dioxides have a specific surface area of 2 according to the BET method.
00~1200m2/g, pore size 10~300A,
It is preferable that the pore volume is 0.4 to 2.5 ml/g, and by having such physical properties, it becomes possible to utilize the moisture in silicon dioxide quickly and sufficiently effectively for extinguishing a fire.

Furthermore, in the present invention, carbonate or bicarbonate is used in combination with these silicon dioxides. As the carbonate, sodium carbonate or potassium carbonate may be used, and as the bicarbonate, sodium bicarbonate or potassium bicarbonate may be used alone or in combination as appropriate. The appropriate amount of these to be used is 5 to 25% by weight based on the total amount including the silicon dioxide. Carbonates and heavy acid salts have the effect of forming a saponified film on the surface of oil, and are highly effective in blocking air. If the amount used is less than 5% by weight, it is difficult to expect a sufficient air-blocking effect, and if it exceeds 25% by weight, the cooling effect of silicon dioxide will be substantially inhibited, which is not preferable.

When such a fire extinguishing agent is actually used, for example, it is stored in a bag or the like and thrown into a deep fryer when a fire breaks out. The injection method does not necessarily have to cover a large area, and the amount added may be about 20% of the amount of oil.

By doing this, the silanol groups of the introduced silicon dioxide are decomposed by the heat of the oil, and when the water evaporates, it absorbs the heat of the oil, making it possible to effectively lower the oil temperature below the ignition point. At the same time, the formation of a saponified film by carbonates and heavy acid salts makes it possible to effectively block air.

The extinguishing agent according to the present invention is a vegetable oil such as tempura oil or frying oil, in other words, the extinguishing agent has an ignition temperature of 300 to 400.
It has an extremely effective extinguishing effect on oil fires at temperatures around ℃, and has the advantage that it does not cause flames to rise during use, does not harden or change in quality, is inexpensive and non-toxic, and can be widely used in homes. .

[Examples] Example 1 1100 g of tempura oil was put into an iron pot, the pot was heated, and the oil was ignited at a temperature of 340°C. At this time 5i(b 33
% by weight, 67% by weight of silanol groups calculated as water (97% of which quickly decomposes to water at 100°C), specific surface area 800-1000 m2/g, pore diameter 80-150 Å, A mixture of 100 g of silicon dioxide (manufactured by PQ, USA, trade name: Brightsolve) having a pore volume of 2 mQ/g and an average particle size of 14 μm and 20 g of soda carbonate powder was sprinkled on the oil surface, and the heat source was removed.

The temperature of the oil in the pot suddenly drops to 320°C after the chemical is added.
The fire was completely extinguished 12 seconds after it made a hissing sound, and the oil temperature reached 310°C. During this time, there were no dangers such as rising of the length or oil splashing.

Example 2 A pot similar to Example 1 was ignited and kept burning for 1 minute until the oil temperature reached 355°C and the flame rose 1 m.

At this time, it has 5i0267% by weight, 33% by weight of silanol groups converted to water (94% of this quickly decomposes to water at 100°C), and has a specific surface area of 10.
A mixture of 200 g of commercially available silicon dioxide with an average particle size of 17 μ and 00 to 1200 ffi2/g, a pore diameter of 30 to 40 Å, and a pore volume of 0.8 mQ/g and 25 g of sodium bicarbonate powder was sprinkled and the heating source was removed. The fire was extinguished in almost the same manner as in Example 1.

In addition, instead of bicarbonate of soda powder, use 15g of bicarbonate of soda powder.
The fire extinguishing effect was almost the same when a mixture of 10 g of soda powder and 10 g of soda carbonate powder was used.

Claims (1)

[Scope of Claims] 1. A fire extinguishing agent whose main components are silicon dioxide with a water content of 80 to 20% by weight and carbonate and/or bicarbonate. 2. The fire extinguisher according to claim (1), wherein the silicon dioxide contains a silanol group. 3. Silicon dioxide has a specific surface area of 200 to 1200 m^2/
g, pore diameter is 10-300 Å, pore volume is 0.4-2.
The fire extinguishing agent according to claim (1) or (2), which has a concentration of 5 ml/g. 4. The extinguishing agent according to claim (1), wherein the carbonate is soda carbonate or potassium carbonate. 5. The extinguishing agent according to claim (1), wherein the bicarbonate is sodium bicarbonate or potassium bicarbonate. 6. The fire extinguishing agent according to claim (1), wherein the amount of carbonate and/or bicarbonate used is 5 to 25% by weight based on the total amount of these and silicon dioxide. 7.Claim (1) that the extinguishing agent is vegetable oil fire extinguisher
extinguishing agent.