Uppfinnare: E E C Cawood Prioritet begtird trait den 10 april 1959 (Storbritannien) Foreliggande uppfinning avser eldslackningspulver, vilka aro avsedda att anvandas for alla sorters brander, exempelvis glodbrander i kolhaltiga material, ytbrander, gasbrander, brander i brannbara vatskor och brander i elektrisk utrustning. Eldslackningspulver, vilka kunna anvandas till ytbrander, brander i brannhara vatskor, gashrander och brander i elektrisk utrustning, aro kanda. Dessa pulver aro emellertid icke verksamma pa glodbrander i kolhaltiga material och besta vanligtvis av natriumbikarbonat, -vilket behandlats for hindrande av kokbildning. Ett eldslackningspulver, som var lampligt for slackning av glOdbrander, har vidare foreslagits, men detta Sr bristfalligt pa grund av den nackdelen, att det icke bibehaller ett friflytningstillstand efter lang lagring, emedan det gradvis absorberar fuktighet frhn luften och bildar kokor efter nagra manader. I det svenska patentet 168 833 Sr beskrivet ett eldslaekningspulver, som Sr anvandbart for alla slags brander, och foreliggande uppfinning avser att astadkomma en alternativ blandning, vii-ken Sr speciellt lamplig for att anvandas i eldslackare av typen med konstant tryck, i vilka bade pulvret och den under tryck varande drivgasen lagras sammanblandade i samma behallare och utsprutas samtidigt.
Inventor: E E C Cawood Priority Begtird Trait April 10, 1959 (United Kingdom) The present invention relates to fire-fighting powders which are intended for use in all types of fires, such as incandescent fires in carbonaceous materials, surface fires, gas fires, fires in flammable water and electric equipment fires. Fire-fighting powders, which can be used for surface fires, fires in hot water shoes, gas fires and fires in electrical equipment, aro kanda. However, these powders are ineffective in incandescent fires in carbonaceous materials and usually consist of sodium bicarbonate, which has been treated to prevent boiling. A fire-extinguishing powder which was suitable for extinguishing incandescent fires has further been proposed, but this is deficient due to the disadvantage that it does not maintain a free-flowing state after long storage, as it gradually absorbs moisture from the air and forms coke after a few months. Swedish patent 168 833 Sr describes a fire extinguishing powder which is useful for all kinds of fires, and the present invention intends to provide an alternative mixture, which is particularly suitable for use in constant pressure fire extinguishers, in which both the powder and the pressurized propellant is stored mixed together in the same container and sprayed simultaneously.
Ett eldslackningspulver enligt uppfinningen bestar av en blandning av ammoniumsulfat, ammoniumdivatefosfat och kaliumklorid med tillsats av sma mangder andra anmen, vilka kvarhalla blandningen i friflytningstillstand. Vilket som heist av de for detta andamal anvanda, vanliga amnena kunna tillsattas, t. ex. talk, fri kalciumfosfat och olosliga metallstearat, dvs. vilket som heist eller flera av dessa amnen eller likvarda amnen kunna inblandas i blandningen. Ammoniumdivatefosfat anvandes i stallet for diammoniumfosfat i nagra andra eldslackningspulver, eftersom ammo niumdivatefosfat Sr speciellt lampligt for lag-ring under tryck. En storre mangd ammoniumdivatefosfat erfordras emellertid, an om diammoniumfosfat anvandes, pa grund av den lagre ammoniumhalten i ammoniumdivatefosfat. En hog anunoniumhalt Sr Onskyard, sa att pulvret kommer att utveckla ammoniakgas, nar det tillfores en eld, ty ammoniakgasen Sr en god eldslackare. Kaliumklorid anvandes i stallet for natriumbikarbonat i andra eldslackningspulver beroende pa kaliumsalternas Mitre lagringsbarhet och storre eldslackningsformaga. A fire-fighting powder according to the invention consists of a mixture of ammonium sulphate, ammonium derivative phosphate and potassium chloride with the addition of small amounts of other substances, which retain the mixture in the free-flowing state. Whichever of the usual subjects used for this purpose can be added, e.g. talc, free calcium phosphate and insoluble metal stearates, ie which heist or several of these substances or equivalent substances may be included in the mixture. Ammonium divate phosphate is used in place of diammonium phosphate in some other fire-fighting powders, since ammonium divate phosphate is particularly suitable for storage under pressure. However, a larger amount of ammonium derivative phosphate is required, if diammonium phosphate is used, due to the lower ammonium content of ammonium derivative phosphate. A high anonymity content Sr Onskyard, so that the powder will develop ammonia gas when a fire is supplied, because the ammonia gas Sr a good fire extinguisher. Potassium chloride was used instead of sodium bicarbonate in other fire-fighting powders due to the miter storability and greater fire-fighting ability of the potassium salts.
De fOredragna blandningarna aro fOljande: Exemp el. The preferred mixtures are as follows: Example el.
Ammoniumsulf at, (NH4)2SO4vikttlelar Ammoniumdivatefosfat, N1141-12P 0440. viktdelar Kaliumklorid, KG!10 viktdelar Talk10 viktdelar Trikalciumfosfat,2 viktdelar Olosligt metallstearat,1 viktdel De &van givna halterna av ammoniumsulf at och anunoniumdivatefosfat kunna andras med— 10 %. Kaliumkloriden kan vara narvarande i 10-15 viktdelar, och de tre forstnamnda amnena skola vara finfOrdelade, sa att de kunna passera genom ett hundramaskors sail (dvs. ett sall, som har 100 maskor per turn). Talken, trikalciumfosfatet och det olosliga metallstearatet skola vara annu mera finfordelade, sa. att de kunna passera genom ett trehundramaskors sail (dvs. ett som har 300 maskor per turn). Halterna for talk, trikalciumsfosfat och olasligt metallstearat karma vidare varieras, t. ex. kan talkhalten vara 10-15 delar, och -vilket som heist eller alla dessa tre amnen kunna ersattas med likvarda amnen, vilka komma att kvarhalla blandningen i friflytningstillstand. 2— 176 — Ammonium sulfate, (NH4) 2SO4 parts by weight Ammonium derivative phosphate, N1141-12P 0440. parts by weight Potassium chloride, KG! 10 parts by weight Talc 10 parts by weight Tricalcium phosphate, 2 parts by weight Insoluble metal stearate, 1 part by weight Potassium chloride may be present in 10-15 parts by weight, and the three first-mentioned substances should be finely divided, so that they can pass through a hundred-mesh sail (ie a hall, which has 100 meshes per turn). The talc, the tricalcium phosphate and the insoluble metal stearate should be even more finely divided, he said. that they can pass through a three-hundred-mesh sail (ie one that has 300 meshes per turn). The levels of talc, tricalcium phosphate and insoluble metal stearate karma are further varied, e.g. the talc content may be 10-15 parts, and -which heist or all these three substances can be replaced by equivalent substances, which will retain the mixture in the free-flowing state. 2— 176 -