DE1219331B - Universal extinguishing powder - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

Number: File number: Filing date: Display date:

A62d

German KL: 61b-2

V27149VIb / 61b
November 13, 1964
June 16, 1966

The invention relates to a universal extinguishing powder which is suitable for fighting fires of all fire classes, both ember and flame fires, such as wood fires and fires of other carbon-containing substances, oil, gasoline, gas fires and fires on electrical systems, and a method for its production .

It is known that dry extinguishing agents have very good extinguishing power. The extinguishing effect is at the previously known extinguishing powders based on sodium hydrogen carbonate mainly on one negative heterogeneous catalysis, the so-called wall effect. By building a powder cloud, the burning process, which runs as a chain reaction, becomes a chain termination reaction forced. In the case of the recently developed extinguishing powders, which are also used against glowing fires found on the basis of ammonium sulfates and phosphates, occurs as a result of prolonged exposure to heat These inorganic salts decompose on the embers, releasing ammonia a. This gaseous ammonia also contributes to the extinguishing and has a more negative effect, so to speak Catalyst in homogeneous phase. In addition, the resulting molten salt penetrates into the Embers and acts as a shield against atmospheric oxygen in the form of a thin layer of glaze. It has already been proposed to use a mixture of sodium hydrogen carbonate, ammonium sulfate and diammonophosphate with the addition of small amounts of stearic acid and silica to improve the water-repellent properties and to increase the flowability as a dry extinguishing agent. In addition, other than ammonium sulfate and primary ammonium phosphate have already been proposed also use potassium chloride in addition to the usual additives. It has also been suggested in addition to primary ammonium phosphate and ammonium sulfate, also sulfur and polyethylene and known ones Use additives. In addition, it has already been proposed in addition to diammonophosphate and Ατητηοη chloride Use melamine as the main component of about 50 to 98 percent by weight. Furthermore, was proposed a mixture of 50 to 90 percent by weight monoammonophosphate, diammonophosphate or a mixture of these phosphates or 50 to 30 percent by weight of ammonium sulfate and 8 to 20 percent by weight Apply barium sulfate. This mixture contains small amounts of a formaldehyde-urea resin or formaldehyde dicyandianide resin and ammonium bromide and known additives are added. It was also pre-universal extinguishing powder

Applicant:

VEB fire extinguishing equipment factory, Neuruppin

Named as inventor:

Dipl.-Chem. Dr. rer. nat. Hans Martin Schreiber,

Neuruppin

propose to use a mixture of sodium sulphite and ammonium sulphate as a dry chemical is composed essentially of equal amounts.

It has now been found that the previous dry extinguishing agents because of the risk of Electricity flashovers when extinguishing electrical systems are only applicable to a limited extent. It was too found that dry chemical containing both sodium hydrogen carbonate and phosphates and They contain sulphates and, when heated to + 60 ° C, show clumping after a short time lead to hardening of the powder. In practice, these high temperatures can occur, z. B. with prolonged, direct sunlight from fire extinguishing containers. It also turned out because of the water-attracting property as disadvantageous, salts such as ammon bromide or ammonium chloride, as Use extinguishing agent or add as an extinguishing agent.

The purpose of the invention is to produce a universal extinguishing agent that can also be used safely Can be used in fires on electrical lines and systems that are under very high voltage stand. Because of its universal applicability, there is thus the risk of using one for this Fire class not or only conditionally approved dry extinguishing agent excluded. Besides, it is very advantageous to produce a universal extinguishing agent in order to meet the required standardization and Type adjustment of fire extinguishers to take into account.

609 579/202

Claims (1)

219 331 The invention is based on the object To develop dry extinguishing agent that can be used universally in the event of fires on electrical lines and plants. The extinguishing agent may not be used as a "Pulyerststrahl." still show a current flow as a melt. Due to its; .composition may; it: -also at prolonged warming-up. + 60 ° C no clumps and must not be hygroscopic. There must also be the other requirements * the an extinguishing powder, such as non-toxicity, good flowability and conveyability, good consistency of powder particles, large specific surface and non-abrasive properties; own. It has been found that the addition of an intimate mixture of formaldehyde-cresol resin and asbestos powder of an extinguishing powder as a powder beam and a melt improved in dust-fine grinding of the electrical non-conductivity to such an extent that the resistance to the 10 ⁷ times the value increases. The current flow is so small that it can practically be neglected. There is no risk of a flashover for the person who is to be extinguished or for the systems to be extinguished. According to the invention, the universal extinguishing powder does not contain any sodium hydrogen carbonate, which was previously thought to play the main role in extinguishing flame fires. The synthetic resin-asbestos mixture is used in a mixture of about 50:50. The universal extinguishing agent is resistant up to temperatures of 60 ° C and shows that the extinguishing times and the extinguishing agent consumption for a petrol, gas and oil fire according to TGL 126 406.01 sheet 3 or according to DIN 14406 were even more favorable than when using powders based on sodium hydrogen carbonate. The invention is described below on the basis of an exemplary embodiment explained in more detail. "'; / ·' "■"".'"■> · .. "■': ■ 'i'·" ⁵ '- - ..' U- ^ iU 30 to 40 percent by weight diammonophosphate,
10 to 20 weight percent ammonium sulfate and
30 to 40 percent by weight monoammon - '* "";; . >"■ phosphate ^{1 !} '".,' ■ '. ^? with a pin mill to a grain size below 0.1 mm crushed and at least 6 hours at one temperature no over. 60 ° C dried. Then will ίο 5 to 10 percent by weight of a mixture of formaldehyde-cresol resin and asbestos flour as well
3 percent by weight tricalcium phosphate, Weight percent magnesium stearate and 0.5 weight percent dye added and mixed thoroughly. -'-... ■■ ;; Claim:; ·: ' ...- A.; - -J- Universal extinguishing powder against fires; Flkmme.il- and embers-forming solid, liquid and gaseous substances and against 'fires ^: on electrical:' systems under high voltage on the basis of ammonium sulfate, diammon phosphate and / or monoammon phosphate with an additive of a two-component Formaldehyde - condensation resin in quantities below 10% and possibly with known additives to improve the flowability and the water-repellent properties, as a result of the fact that it contains 5 to 10% of a mixture of a formaldehyde-cresol as a synthetic resin component. Contains resin and asbestos flour. ■ - ■ ':' ■■■ Considered publications:
German publication no.1000 693,
1001117; 1012528, 1090 967, 1138 641, 1167189;
British Patent No. 844445.