US1891673A - Fire extinguishing compound - Google Patents

Description

Patented Dec. 20, 1932 ACIE J. GILLEO, OE DETROIT, MICHIGAN, As'sIGNoE To THE OUT I'TE EI'RE EXTIN- GUISHER CORPORATION, OF DETROIT, MICHIGAN, A'OOBPOEATION or OH O FIRE EXTINGUISHING coivrrounn No Drawing. Application filed April 25,

This invention relates to improvements in fire extinguishing compounds, and also to a method of preparing the said compound.

It is an object of the invention to provide a fire extinguishing compound consisting primarily of a powdered material capable of liberating carbonic acid gas when decomposed by heat which is coated with a fatty acid and thereby rendered substantially water-repellent, non-caking and tree-flowing, so that after standing for prolonged periods the compound may be readily discharged from a container.

Another object of the invention is to provide such a fire extinguishing compound wherein the fatty acid is mixed with the aid of heat with the powdered material so that a mechanical combination results, and wherein there is no fear of liberating carbonic acid gas which the said powdered material gives off when heated beyond a certain temperature at which a chemical change would result to the detriment of the compound as a fire extinguishing medium.

Other objects and advantages of the invention will become apparent from the following specification wherein I describe both the ingredients employed and the preferred ways in which they are compounded.

I utilize a fatty acid, such as stearic acid, which must be rendered substantially liquid. This may be accomplished by heating the acid, or by forming it into a solution by the addition of carbon tetrachloride. In the latter case I find that it is usually preferable to heat the solution though care must be taken that the tetrachloride is not heated to its boiling point which is relatively low.

To the heated acid, or acid solution, I add some finely powdered silicate, such as fullers earth or kaolin, and while so doing I prefer that the mixture be maintained in a heated state.

I then heat a finely powdered material capable of liberating carbonic acid gas when decomposed by heat, such as sodium bicarbonate, calcium carbonate or the like, to about 140 degrees Fahrenheit, which I find is a safe temperature sufficiently below its point of decomposition and one which will cause rela- 1931. Serial No. 533,002.

1am, free fiowing and non-cakin More over while a satisfactory result is obtained if the silicate is omitted I find that the latter does add to the free flowin'g qualities of the compound. I I I Very satisfactory results are obtained by the employment of the above ingredients in substantially the following proportion by weight:

1 fatty acid 3%% powdered silicate 95% powdered material having the properties herein named.

When carbon tetrachloride is used it is mixed with the acid in substantially equal proportion thereto, though its addition does not ultimately change the proportions given above since it is subsequently eliminated by evaporation.

While in the foregoing the preferred forms of the compound and the methods of compounding have been described, it is understood that the invention is susceptible to such changes as fall within the scope of the appended claims.

What I claim is:

1. A fire extinguishing compound consisting of a powdered material capable of liberating carbonic acid gas when decomposed by heat, and a fatty acid with which said material is coated so as to render it substantially water-repellent and free-flowing.

2. A fire extinguishing compound consisting of a powdered material capable of liberating carbonic acid gas when decomposed by heat, and stearic acid with which said mate rial is coated so as to render it substantially water-repellent and free-flowing.

3. A fire extinguishing compound consisting of a powdered material capable of liberating carbonic acid gas when decomposed by heat, a powdered silicate, and a fatty acid 5 with which said inaterial and silicate are coated to render them substantially waterrepellent and free-flowing.

4. A fire extinguishing compound consisting of a powdered material capable of liberating carbonic acid gas when decomposed by heat, a powdered silicate, and stearicacid with which said material and silicate are coated to render them substantially waterrepellent and free-flowing. I p r 5. A fire extinguishing compound consisting of sodium bicarbonate and a fatty acid.

6. A fire extinguishing compound consists ing of sodium bicarbonate and stearic acid.

7 A fire extinguishing compound consist- I V 1 v a ing of sodium bicarbonate stearic acid, and a r w a v l powdered silicate. v n 1 8. A fire extinguishing'compound consistv y ing of a powdered material capable of liberating carbonic acid gas when decomposed by I I H U V heat and a fatty acid which melts at substan- A r v tially the same temperature as that at which the powdered material liberates carbonic acid gas. i

9. A fire extinguishing compound consist- I I r I i ing of sodium bicarbonate and a fatty acid p o 5* i which melts at substantially the same tem- I perature as that at which the sodium bicarbonate liberates carbonic acid gas.

as Aoin J. GILLEO. p j i I is