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United States Patent Office Patented Dec 3,484,372 United States Patent Office Patented Dec. 16, 1969 2 Thus an efficient material for extinguishing flames from 3,484,372 FIRE-EXTINGUISHING COMPOSITIONS burning liquid or gaseous fuels should be able to release James Derek Birchall, Northwich, England, assignor to quickly in the flame very small particles of alkali metal Imperial Chemical Industries Limited, London, Eng compounds that readily give rise to active species. It land, a corporation of Great Britain should preferably not be poisonous as are alkali metal No Drawing. Filed Aug. 1, 1966, Ser. No. 569,046 5 oxalates, and to have practical utility it should not be ex Claims priority, application Great Britain, Aug. 11, 1965, pensive. It is one object of this invention to provide such 34,374/65 materials and we have found it can be achieved by mixing int. Cl. A62d 1/00 the active substance for example the alkali metal com U.S. C. 252-7 10 Claims pound with molten urea and allowing the resulting mass to O cool and solidify. Examples of alkali metal compounds that can be used in this way are carbonates, bicarbonates, hydroxides and ABSTRACT OF THE DISCLOSURE lower fatty acid salts of sodium and potassium, of which Novel fire-extinguishing compositions are made by mix 5 potassium bicarbonate is particularly effective. ing at least one of bicarbonates and carbonates and hy We find further that such compositions of alkali metal droxides of sodium and potassium, ammonium sulphate, compounds and urea are also effective in extinguishing bisulphate, chloride, bromide and ammonium hydrogen burning cellulosic materials such as wood, paper and cot phosphate with molten urea at about 130°-150° C., al ton. Under these circumstances the urea too contributes to lowing the melt to solidify and grinding to a fine powder. 20 the fire-extinguishing effect by liberating non-combustible The proportion of the added salt is from 10% to 70% gases and by melting to form a coating on the burning by Weight of the melt and the preferred salt is potassium object that interferes with combustion. bicarbonate. Other substances that when compounded with urea gain in effectiveness against burning cellulosic materials are ammonium salts of strong acids, for example ammonium chloride, bromide, sulphate, bisulphate and diammonium This invention relates to compositions of matter having hydrogen phosphate. Urea compositions of these ammoni the ability to extinguish flames arising from the combus um salts are strongly acidic when hot and this enhances tion of liquid and gaseous fuels such as liquid hydrocar the known action of the salts against burning cellulosic bons, hydrogen, methane and of solid fuels such as wood, 30 materials which is usually regarded as being due to the paper and textiles. effect of their residual acidity in dehydrating cellulose and Water is suitable for putting out fires of burning wood, altering the composition of its pyrolysis products in the paper and textiles but is unsuitable and even dangerous for direction of reducing the concentration of flammable vola use against burning hydrocarbons and fires in electrical tile compounds therein. equipment for example transformers. For putting out fires 35 Thus according to one form of my invention I pro of burning hydrocarbons several agents are available, for vide a material for use in extinguishing fires comprising example carbon dioxide, bromochlorodifluoromethane and a composition as hereinafter defined of urea and at least various powders comprising essentially sodium bicarbo one active fire-extinguishing agent selected from salts and nate or potassium bicarbonate. Mixtures based on other hydroxides of alkali metals. particulate chemicals are known, for example mixtures 40 In one particular form of the invention a material for containing ammonium phosphate or ammonium sulphate use in extinguishing fires comprises a composition of together sometimes with a thermoplastic material intended urea and at least one salt chosen from bicarbonates and to assist in extinguishing the fire by forming an imperme carbonates of sodium and potassium. able skin on the burning object. Mixtures of this type are In another form of the invention a material for use sometimes described as all-purpose extinguishing agents in extinguishing fires comprises a composition of urea but they have in general low efficiency against liquid-fuel and at least one salt chosen from ammonium sulphate, or gaseous-fuel fires. bisulphate, chloride, bromide and hydrogen phosphate. The efficiency of sodium and potassium bicarbonates The composition of urea and fire-extinguishing agent is and hydroxides, and of other sodium and potassium salts defined as the material obtained by mixing the agent or in extinguishing liquid-fuel and gaseous-fuel fires depends agents with molten urea and subsequently allowing the on their specific surface-area, the efficiency being greater melt to cool and solidify. The operation is conveniently the finer the particle-size and hence the greater the sur carried out under a moderate pressure of about 5 atmos: face-area. In general potassium, rubidium and caesium pheres and at a temperature of 130-150° C. when alkali compounds are regarded as Superior to sodium compounds metal and ammonium salts are the active fire-extinguish but the efficiency also depends on the acid radical of the ing agents. When alkali metal hydroxides are the chosen salt. For example in the extinction of diffusion flames po agents the operation can be carried out at atmospheric tassium oxalate is twenty to thirty times more effective pressure. For use as a powdered fire-extinguishing ma than potassium bicarbonate though both in the flame yield terial the solid mass so obtained is finely ground, for ex potassium carbonate. From the results of my experiments ample to give a powder passing a No. 240 British Stand I believe this difference is due to the smaller particle ard mesh. Anti-caking agents and free-flowing agents may size of the potassium carbonate produced from potassium be added to the powder, for example stearic acid, Stearates, oxalate. We find that the particle-size of potassium car talc and finely divided alkaline earth silicates; other ma bonate produced from potassium bicarbonate differs little terials can be added for specific purposes where necessary. from that of the latter whereas the particle-size of that The unground solid mass may also be used as a fire-ex produced by heating potassium oxalate is in the sub tinguishing material, for example as a lining or coating micron range. Since the species active in inhibiting flame for materials of construction liable to be exposed to is considered to be either the ion of the alkali metal or a flames or high temperatures. derivative thereof it is reasonable to believe that smaller The compositions conveniently contain from 10% to particles by yielding a higher concentration of active 70% by weight of active fire-extinguishing agents. species than do large particles would be more effective. 70 The invention is illustrated by experiments carried out The inherent volatility of the particles produced in the in an apparatus designed to test the ability of powders to flame is also important. extinguish a flame of burning combustible gas for example 3,484,372 3 4. hydrogen or coal gas. The apparatus comprises a vertical What I claim is: tube 1 metre high and 5.5 cms. internal diameter fitted 1. A Solid, chemical fire extinguishing composition con with a baffle 35 cms. from its lower end arranged to dis sisting essentially of the product obtained by mixing with perse falling powder. The gas issues from a horizontal molten urea at least one member selected from the group jet having its orifice just below the lower end of the tube consisting of potassium and sodium bicarbonates, car and on the vertical axis thereof so that powder falling bonates and hydroxides and the sulphate, bisulphate, chlo down the tube can impinge on the flame. The flame and ride, bromide and hydrogen phosphate ammonium Salis, lower end of the tube are surrounded by a guard-collar the proportion of said member in the melt being f. On 11 cms. diameter and 20 cms. high. A small bucket is 10% to 70% by weight thereof, and subsequently cooling arranged at the upper end of the tube to tip its contents and solidifying and powdering the melt. down the tube, and air is also passed down the tube to O 2. A composition as claimed in claim 1 wherein the counteract convection caused by the flame. said member is at least one salt selected from the group With a flame of burning hydrogen at a feed-rate to the consisting of bicarbonates and carbonates of sodium and jet of 1.2 litres per minute the effects of various powders of potassium. of particle size less than 64 microns placed in the bucket 5 3. A composition as claimed in claim 1 wherein the and allowed to fall down the tube were observed and are said member is at least one hydroxide selected from the summarised in Table 1. group consisting of Sodium hydroxide and potassium hydroxide. TABLE 4. A composition according to claim 1 wherein the said member is at least one salt selected from the group Powder Weight in g. allowed to fall consisting of ammonium sulphate, ammonium bisulpinate, Sodium bicarbonate.---------------- No extinction below 11 g. ammonium chloride, ammonium bromide and diammoni Potassium ferrocyanide No extinction below 7 g. Potassium oxalate--------- No extinction below 11g. um hydrogen phosphate. Urea-potassium bicarbonat a Flame extinguished with 5 g. 5. A composition as claimed in claim 2 wherein the said member is potassium bicarbonate. 6. A method of protecting materials of construction Each of the four substances included in Table 1 was from the action of fire comprising coating or lining said prepared in powder form by grinding it through a No.
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