JPS5988390A - White smoke emitting agent composition - 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 The present invention relates to a composition of a white smoke generating agent that is non-explosive, harmless, and has excellent smoke generation performance.

In general, white smoke generators are used for inspection and maintenance of indoor air quality and airtightness in buildings, the operating status of smoke detectors, the circulation and leakage of smoke exhaust pipes, and the airtightness of sealed containers. It is something. However, conventional white smoke generating compositions include white zinc chloride smoke obtained by reacting zinc powder or zinc oxide with an organic chloride such as hexachloroethane.

Alternatively, phosphorous oxide or phosphorus chloride, which is obtained by reacting phosphorus with an oxidizing agent, has been used; however, these all have the drawbacks of being somewhat toxic and corrosive. On the other hand, as a non-toxic white smoke agent, white potassium chloride smoke can be obtained by spreading potassium perchlorate and organic or inorganic fuel, but this is defined as gunpowder under the Explosives Control Law. There are restrictions on handling.

The present invention is provided in view of the points listed in L.

The purpose is to obtain a white smoke generating agent that is harmless, odorless, and safe to handle without being a gunpowder.

In order to achieve the above object, the present invention uses dibutyl phthalate as the second smoke generating component, absorbs it into wood flour, and further adds ammonium nitrate.

In connection with the present invention, we conducted an optical experiment on white smoke and found that even in an inherently transparent liquid, if the refractive index of the air trap is large, fine particles of 0.1 to 10 μm will emit light diffusely. It was discovered that it is observed as white smoke. In the present invention, a non-toxic, high-boiling oil with a high refractive index is made into fine particles as a source of white smoke. However, even when high boiling point oil is mechanically atomized by a spraying method, it does not become fine particles.

There is almost no white smoke. On the other hand, the external heating evaporation method produces white smoke, but it takes a long time to generate smoke and the smoke generation efficiency is poor. In addition, petroleum-based oils such as vaseline and wax are dangerous because if they continue to be heated in the air, the smoke will stop and the oil will start to ignite and burn. Therefore, among the many high boiling point oils, we conducted experiments to find one with a low risk of ignition and a boiling point suitable for the purpose of the present invention, and cyphthyl phthalate was found to be the most suitable. Although diethyl phthalate was also good, its smoking effect was worse than that of dibutyl phthalate, and it was also about twice as expensive.

Next, dibutyl 7-talate was prepared using a method other than gunpowder.
The problem was how to efficiently evaporate the particles to a size of 1 to 10 μm. When asbestos or diatomaceous earth impregnated with oil was fumigated, the fuming effect was not good.

However, in the present invention, when a composition in which wood flour is impregnated with diptyl 7-talate and mixed with ammonium nitrate is ignited through paper impregnated with saltpeter, a very large amount of heat is generated in a short period of time. It was discovered that large amounts of white smoke continued to be generated. The function of ammonium nitrate is to allow self-emission of smoke to continue even after the fire source is removed. Wood flour is used to fumigate dibutyl phthalate by burning it while being supplied with oxygen by the ammonium nitrate, and paulownia wood powder is preferable as the raw material.

Next, examples of the present invention will be shown.

[Example 1] Dibutyl phthalate 25-45 i wood powder
(Paulownia) 65-45% Ammonium nitrate for fertilizer 20-35% To achieve the above composition, impregnate wood flour with dibutyl phthalate and further add ammonium nitrate for fertilizer. Mix thoroughly and uniformly, A tin can with a diameter of 5 cm and a height of 15 sides was filled with saltpeter-impregnated paper in the center hole, and when lit with a match, a large amount of white smoke continued to be emitted for 2 minutes. The white smoke mentioned above is completely harmless as it is non-toxic, odorless and non-irritating. In order to compare the smoke generation effect, a ready-made white smoke tube and a composition according to an example of the present invention were arranged at 10 m intervals and ignited at the same time.
Almost the same effects were obtained in terms of smoke generation property and smoke generation time.

Therefore, (1) the white smoke generating agent composition of the present invention is (1) excellent in smoke generation effect, and is non-toxic, odorless, and non-irritating;
There is no risk of pollution, and since it is not an explosive, it is safe to handle, and is novel and useful as a composition for this type of white smoke generator.

Patent applicant: Showa Kaiko Co., Ltd. Representative Patent Attorney Masao Isono

Claims (1)

[Claims] Dibutyl phthalate is used as the smoke component, and this is mixed with wood powder e.
A composition of a white smoke generating agent, characterized in that ammonium nitrate is added thereto.