DE1941060A1 - Fire extinguishing powder - Google Patents

Description

Nu-Swift International Ltd «in Eiland, Yorkshire, UK

Fire extinguishing powder

The invention relates to dry powder for fire extinguishing purposes, which is particularly suitable for use with portable fire extinguishers,

The fire extinguishing powder according to the invention consists of a mixture which is commercially available under the name MONNEX / and at least one other fire-dissolving substance

contains. MONNEXi is owned by Imperial Chemical Industries Ltd. and is in their in-house magazine TS / 2283 ^ .vom

May 1968 / nearer described. As additional fire-extinguishing substances come into consideration?

1. alkali or alkaline earth metal bicarbonates and carbonates,

2. ammonium phosphates, e.g. mono- or dlammonium phosphatej

3. Ammonium sulfate, / ^ ~

4. Borates or boric acid, / ^ üi ^^ u ^ JL · ^

5. ammonium bicarbonate, \ Q ^ ,;

6. Sodium phosphate, \

7. Potassium sulfate

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8. Alkali metal halide] eBV _; e.g. potassium chloride,

9. Resin molds or polymer compounds, e.g. polyvinyl chloride,

10. starch and similar materials,

11. Proteins and Similar Materials.

MONNEX an I have a high fire-releasing power, but can his Modified effectiveness for different types of fire and for different types of fire extinguishers when mixed with one or more of the additional substances listed above. In some cases the effectiveness of the mixture according to the invention compared to MONNEX alone or compared to the other additives improved per se or in the known combinations

The additional components are all cheaper than MONNEX. Therefore only approximately the same effect is achieved As with MONNEX alone, compared to the use of MONNEX alone there is a reduction in price or improved economic efficiency achieved. To extinguish a flame, dry powder must be in one special mist of sufficiently high concentration be dispersed. If the concentration is too weak, the flame will not work deleted, if it is too high, this is associated with an uneconomical effort. A trooken powder of higher specificity Efficacy can be dispersed in a weaker mist than a less potent powder. The respective concentration of the looseness does not only depend on the effectiveness of the Lösohpulvars, but also of the one for its delivery and nebulization used device. The best concentration in each case

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of the solvent mist can be determined when the mixing ratios can be varied between the effective and then less effective ingredients, whereby the overall effectiveness is compared with the powder concentration of the fire extinguisher. MONNEX is so extinguishing that its full potential through the usual fire extinguishers are not used because they do not distribute NONNEX finely enough over the source of the fire. Will MONNEX but according to the invention with one of the other, less soluble ones Mixture components are mixed, so is the full loosing potential of a fire extinguisher of the usual design compared to the MONNEX turn alone quite economical and satisfactory.

The selection of the additional mixture component (s) depends on the purpose for which the mixture is used target. Should it be used, for example, to extinguish class B fires, i.e. to extinguish flammable liquids, a simple mixture of MONNEX with an alkali bicarbonate, e.g. in the case of fires involving materials containing carbon, which tend to form hot spots, additional components are added to the mixture in the form of phosphates and sulfates are preferable.

The powder mixtures according to the invention can of course also contain other surcharges, as they are with known Feuerlpschtrockenpulver be used. Such additives can be extenders or other substances that interact with the extinguishing agents

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constituents REACT in a favorable manner, i.e. with MONNEX or with the other ^ dissolving additives, whereby the reaction can come about under the influence of the fire to be extinguished. The supplements can also be used to prevent the caking to prevent the extinguishing powder and / or to promote the mixing and misting of the extinguishing components.

Suitable known additives include lime, stearic metal salts, barium sulfate, silicates and asbestos powder. These additives may be present in an amount of 0-30 wt -.% Of Gesamtgemisohes be used, but their proportion is advantageously only about 15 wt -.% Of Besamtgemlsches.

The mixture or its components can be subjected to a special treatment in order to keep it under maintenance to secure the loose, powdery state. For this purpose, the constituents can for example be subjected to a silicon treatment, as described in the British patent 1 095 104- is described. Otherwise the mixture or its components are also treated to make them foam compatible so that they do not impair the formation of the extinguishing foam. Such treatment is in the British Patent specification according to application 17 852 of 1966 described.

Preferably MONNEX is in a proportion of 5-80 wt - used% of the total mixture, of other ^, deleted active ingredients not less than 5 wt -..% And of other pictures not more than 30 wt -. Be used% of Gesamtgemisohes. This results in the following compilations for preferred mixtures:

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MONNEX 5 - 80 %

other extinguishing components 5 - 95 % surcharges O - 30 %

According to a further *, preferred feature of the invention amount to the shares in MONNEX and other extinguishing components in a balanced mixture between 30 - 70 wt .- # for each ^ of these components, thus neglecting the Surcharges. The components that are effective in extinguishing are thus set as follows:

MONNEX 30 - 70% by weight
other ingredients 70 - 30% by weight

According to a further preferred feature of the invention and the other MONNEX deleted active ingredients in a balanced mixture approximately in the range of 45 - j> 5 wt -.% For each of these components present. In the borderline case, they can be used in equal amounts of 50% by weight of the total mixture.

Below examples are given for extinguishing mixtures according to the invention, wherein the proportional amounts of each as weight - apply% of the total mixture..
Example 1 .

MONNEX 45 % Sodium bicarbonate ^ 5 ■% Surcharges 10 % Example 2. MONNEX 40 % Monoammonium phosphate 25th % Diammonium phosphate 25th % Surcharges
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example

4, MONNEX B. MONNEX » Ammonium sulfate t MONNEX 40 % Sodium bicarbonate Monoammonium phosphate Ammonium phosphate Dlammoniumpho sphat 25 * Mono ammonium sulphate Diammonium phosphate MONNEX 15 % Diammonium sulfate Barium sulfate MOMNEX 15 % Surcharges Calcium phosphate Sodium borate ς * q / example Kieselguhr Surcharges mica 35 - 40 MONNEX 30 % Amraonium Bicarbonate 15 % Surcharges
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J> pi example 36-44 7th 36-44 10-15 example 50 % ö. 50 % example 40 % 50 % 10 % example 70 % 25 % 5 %

Example· 9 ^e MONNEX 40 % Trisodium phosphate 20 % Ammonium sulfate 25 % Surcharges 15 % 10. example MONNEX 60 % Potassium sulfate 30 % Surcharges 10 % 11. example MONNEX 40 % Sodium chloride 40 % Surcharges 20 % 12th example MONNEX 70 % strength 30 % Surcharges 10 % Eat. example MONNEX 60 % strength 30 % Surcharges 10 ^ 14th example MONNEX 55 ^ casein 30 % Surcharges 15 #

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Claims (11)

Patent claims: MU) dry powder device for fire extinguishers, consisting of fire-extinguishing agents of different extinguishing power, characterized in that the extinguishing powder mixture .de- <bo and contains at least one other extinguishing component. 2. Extinguishing powder mixture according to claim 1, characterized in that the additional extinguishing component from consists of one or more of the following active ingredients: 1. alkali or alkaline earth metal bicarbonates and carbonates, 2. ammonium phosphates, e.g. mono- or diamronuraphosphat, 3. ammonium sulfate, 4. borates or boric acid, 5. ammonium bicarbonate; 6. sodium phosphate, 7. potassium sulfate, 8. Alkali metal compounds, e.g. potassium chloride, 9. Resin or polymeric compounds, e.g. polyvinyl chloride, 10.starch and similar materials, 11. Proteins and similar materials. 3. Extinguishing powder mixture according to claim 1 or 2, characterized in that that the mixture contains one or more additives · which under the action of heat with Sen other extinguishers Components react in the sense of an increase in the dissolving effect. 009827/1688 4. Extinguishing powder mixture according to claim 1 or 2, characterized characterized in that the mixture contains one or more additives which, in the sense of improving the shelf life, of Maintaining the dry state and protection against caking of the extinguishing powder components are effective * 5. Extinguishing powder mixture according to claim 3 or 4, characterized in that that the additive or surcharges are used in a proportionate amount of up to about 30 wt .- ^ of the total mixture. 6. Dry powder mixture according to claim 5 »characterized in that the proportion of pictures does not exceed 15 wt -% of the total mixture lies.. 7. Dry powder mixture according to any one of claims 1-6, characterized in that the proportion of MONNEX between 5 00 wt -.%, The proportion of the other deleted active substances not less than 5 wt -.%, And the other loadings not exceeding 30 wt. - ^ of the total mixture. 8. Extinguishing powder mixture according to claim 1, characterized by the following composition: MONNEX. 5 - 00 % other extinguishing substances 5 - 95 % surcharges 0 - 30 %, 9 · Extinguishing powder mixture according to claim 8, characterized in that MONNEX and the other extinguishing substances are each in ainoiii Mt eil between 30 - 70 Gaw .- #, based on the total share of extinguishing substances, i.e. without additives, before} i; aid'ία s lrid. BATH ORIGINAL 009827/1688 '- 10. Extinguishing powder mixture according to claim 8, characterized in that MONNEX and the other extinguishing active ingredients are each contained in the mixture in a proportion between 4-5 - 55 % by weight , based on the total proportion of extinguishing substances » 00982 7/1688