DE2248920A1 - LIQUID FIRE EXTINGUISHER - Google Patents

Description

concerning:

" Liquid fire extinguishing agent"

The invention relates to a liquid fire extinguishing agent the base of lower aliphatic halogenated hydrocarbons ~ fabrics.

For extinguishing fires, especially liquid fires involving hydrocarbons or flameless fires Fires or embers such as those caused by defective electrical equipment are caused by various aliphatic C ^ - bis (^ -halogenocarbons due to their great fire extinguishing capacity in use »The disadvantage of them, however, is that they can be removed by spraying or spraying remains limited regardless of the type of application.

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Attempts have already been made to reduce the volatility of fire extinguishing agents based on halogenated hydrocarbons by adding liquid or solid chlorinated hydrocarbons * - substances with a high boiling point, for example hexachloroethane, Reduce perchloronaphthalene, hexachlorobenzene and perchlorotriphenylbenzene. These are chlorinated However, compounds are generally sparingly soluble in the halogenated hydrocarbons in fire extinguishing agents. To theirs To increase solubility in the lower halogenated hydrocarbons, additional solvents such as trichlorethylene have already been used used. However, these additional solvents themselves have little or no fire extinguishing properties, so that the effectiveness of such fire extinguishing agents is reduced.

The known fire extinguishing agents have already been mixed with 0.5 to 10% cellulose alkyl ether. However, these cellulose alkyl ethers are also sparingly soluble in the halogenated hydrocarbons and instead of a single-phase fire extinguishing agent there is a suspension of the cellulose alkyl ether in the halogenated hydrocarbons and therefore the evaporation of the fire extinguishing agent is not reduced in a satisfactory manner.

The aim of the invention is to avoid the known disadvantages and to provide a liquid fire extinguishing agent that penetrates the seat of the fire much better and with that the seat of the fire in a considerably larger radius of action can be reached and combated than with the usual means.

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It has been shown that splashing or spraying. of according to the invention provided liquid fire extinguishing agent on different types of fires, such as so-called dry, fat and / or gas fires or flame fires, ember fires and smoldering fires are significantly improved in this sense that the fire extinguishing agent penetrates better into distant sources of fire and / or these better can be achieved while maintaining or even increasing. the fire-extinguishing properties of the agent, when this relatively small amounts of organic silicon compounds are added.

The fire extinguishing agent provided according to the invention consists essentially of one or more aliphatic halogenated hydrocarbons in an amount of 50 to 99 »9% by weight, based on the final mixture and from one or more polyorganosiloxanes in an amount of 0.1 to 20% by weight, based on the final mixture, and optionally from 0 to 4-9.9% by weight of at least one third solvent, with which that-in-solution bring certain, into the Halogenated hydrocarbons is made easier or only slightly soluble polysiloxanes and / or from a propellant, which itself may have fire-extinguishing properties owns.

That present in an amount of from 50 to -99.9 percent by weight aliphatic hydrocarbon is preferably a C ^ - to Cc -chlorofluorinated, bromofluorinated and / or -bromochlorofluorinated aliphatic hydrocarbon, such as trichlorofluoromethane, 1,1,2-triehlor-1,2,2-. trifluoroethane, bromochlorodifluoromethane, bromotrifluoromethane, 1,2-dibroyn-1,1,2,2-t etraf luox'ethane, 1,2-dibronhexafluorofluorocarbon, especially ^

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propane and 3-bromo-1,1,1-trifluoropropane. But it can also non-fluorinated aliphatic halogenated hydrocarbons, such as ethyl bromide, chlorobromethane and bromoform are used reach.

The polysiloxanes of the invention are either straight-chain Polysiloxanes of the formula:

° V (3-y)

Si

s 2

wherein E is a hydrogen or a group - Si - E

\ 3

12 3
is wherein E, E and S ^ optionally halogenated C ^ - C -, -Alley groups, optionally halogenated Cg or CQ-aryl, optionally halogenated C ₁ -, - to Cq -aryl s alkyl engrupp, optionally halogenated Cr ₇ to C 1 -C 4 alkylaryl groups, X is a halogen atom, y is a number from 0 to 3 and η is a number from 0 to 7,000.

Cyclic polyorganosiloxanes are also suitable Formula:

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A I 04-Si

I A

SiA,

SiA.

wherein A is the group CH JS./--ζ \ , η is a number from O "to 20, X is a halogen atom and y is a number from 0" to 3.

The connection that may be present in the fire extinguishing agent can be:

At least one aliphatic C ^ - "to (^ -halogenocarbon, such as methylene chloride, chlorodifluoromethane, dichlorofluoromethane, dichlorodifluoromethane, carbon tetrachloride, Dichloroethane, trichlorethylene and perchlorethylene; one or more aliphatic Cp- bis substances, v / ie isooctane; at least one aromatic Cg bis substance such as benzene, toluene or naphtha solvents; at least one terpenic hydrocarbon such as turpentine oil;

a complex set of hydrocarbons, such as gas oil, Kerosene or Solvent Stoddard; at least one cycloaliphatic Cg-C.Q hydrocarbon, such as cyclohexane and cyclodecane; at least one carbonyl group-containing biudung, such as acetone or methyl ethyl ketone;

C.Q hydrocarbon

Q ₇ - to C -, - Ver

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at least one C ^ - "to Cr aliphatic ester, such as Amyl acetate;

at least one C ₂ - "to Cg-ether, such as dimethyl ether and diethyl ether;

at least one C ^ - to Cg-hydroxy compound, such as Ethanol, isopropanol, butanol and heptadecanol; at least one cyclic ether such as dioxane.

If the compound to be added * is itself flammable, so it is of course only in low concentration, in the order of magnitude of a few percent of the total mixture, for example up to 4% added. .

According to a preferred embodiment, the fire extinguishing agent contains 80 to 99.5% by weight of aliphatic Halogenated hydrocarbons, 0.5 to 5% by weight polysiloxane and from 0 to 19.5% by weight, if appropriate compound to be added, in each case based on the weight of the final mixture.

Bas according to the invention provided liquid fire extinguishing agent can be used in mobile, portable and stationary devices or fire extinguishing systems, in particular in the automatic fire extinguishing systems to combat Liquid fires or gas fires.

The fire extinguishing agent is sprayed on with the help of any conventional propellant, for example with the help of a liquefied or compressed gas dissolved under pressure, such as nitrogen, CO ₀ , dichlorofluoromethane or with the help of any pressure-generating agent

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Systems such as pumps, compressors, etc.

The following examples serve to provide a more detailed explanation the invention.

Example 2

2 In a trench with a surface area of 20 m

4 m ⁵ fuel P (boiling range 110 to 16O ⁰ C, density of 0.742 / 15 ° G) 1 is set min in fire and then mm by means of a distributor or sprayer 0 26 under a nitrogen pressure of 10 B> ar a liquid mixture spraying thereto or sprayed, which 95 wt .-% bromochlorodifluoromethane as the actual fire extinguishing agent as well

5% by weight of plysiloxane of the formula:

CH,

Si-O

CH,

Si

CH,

- 0-

where η corresponds to a product with viscosity 50 cSt / 25 ° C, contained. The original ambient or outside temperature was JO C, the distance of the fire extinguishing device from Seat of fire 30 m; the flames were within 10 seconds turned off.

For comparison, the experiment was repeated without polysiloxane. The flames were extinguished within 10 see when the

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The distance from the fire extinguishing device to the source of the fire was only 20 m.

Example 2

Under the same experimental conditions as in Example 1, a liquid mixture of 98 wt -% bromochlorodifluoromethane and 2 wt% ~ polysiloxane of formula..:

HO

CH-

Si

CH,

tested with η about 6,000.

The same source of fire was extinguished within 8 seconds at a distance of the extinguishing device of 35 m.

Example 3

Example 1 was repeated with a liquid mixture containing 88% by weight of bromochlorodifluoromethane, 10% by weight Irichlorofluorraethane and 2 wt .-% Poljsiloxan according to Example 2.

The same source of fire was within from a distance of 38 m cleared by 8 see.

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■ Example 4 ·

Under the same conditions as in Example 1, a liquid mixture containing 98 wt .-% bromochlorodifluoromethane and 2% by weight polydimethylcyclopolysiloxane - Mixture of cyclic products - of the formula:

^CH 3 CH ₃

Si

CH ₃ CH.

CH ₃ ^ CH ₃

where η is a number from 0 to 1? is used.

The fire source was at a distance of 30 m within cleared by 12 see.

Example 5

Under the working conditions of Example 1, a liquid mixture containing 80 wt .-% bromochlorodifluoromethane, 18% by weight trichlorofluoromethane and 2% by weight Tried polysiloxane according to Example 2.

The seat of the fire was after 12 seconds from a distance of 40 m turned off. ■ PATENT CLAIMS:

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Claims (2)

PATES1CANSPHt) CHE 1) Liquid fire extinguishing agent containing 50 foil 99 »9 % By weight of one or more aliphatic halogenated hydrocarbons, characterized in that it additionally contains 0.1 Ms 20% by weight of one or more polysiloxanes. 2) Fire extinguishing agent according to claim 1, characterized in that it is a straight-chain polysiloxane the formula: CH. ? ^H y ^x (3-y) Si ^CH y ^x (3-y) in which η is a number from 0 to 7,000 and H is a Hydrogen atom or a group 12 3 stands in which R, R and R are optionally halogenated 309815/0902 1A-42 025 CL- to C, alkyl, optionally halogenated Og- or C, -Q-aryl groups, optionally halogenated C -, - up to Cq-arylalkylene or optionally halogenated Cv ₇ - to CL Q-alkyl aryl Grupp en mean X is an Halogen atom »and y a number from 0 to 3 is" fc »contains. 3) fire extinguishing agent according to claim 1, characterized in that it is a cyclic polysiloxane the formula: Si-O SiA wherein A is the group CH-'X / ;, ^, X is a halogen atom is, η is a number from 0 to 20 and y is a number from to 3 contains. 4) fire extinguishing agent according to claim 1 to 3 »thereby characterized in that it optionally additionally contains 0 to 49.9% by weight cosolvent for certain contains little or practically insoluble polysiloxanes and / or a blowing agent. 5) fire extinguishing agent according to claim 1 and 4, characterized in that it is 80 to 99 »5 wt .-% aliphatic halogenated hydrocarbons, 0.5 to 5% by weight 3 - 309815/0902 1A-42 025 Polysiloxanes and 0 to 19.5% by weight cosolvent and / or contains propellants. 6) Feuei ^ iorxhinittel · according to claim 1, 4 or 5, characterized in that it is a 1 ipha ti sch en shark ο ^ erikohl en v: as ce rs te C f a chlorinated, bromofluorinated and / or bromci ¹ ,: .orfluorinated G, - to C _t - ~ X carbon contains. 7) J. ^{! I} eue: ^ir lör.c} up.ittel according to claim 6, whereby - 3c e η η ζ eich η et that it contains a G ^ -Chlorfluor-, Bromfluor- ujic / or bromochlorofluorocarbon. 8) fire extinguishing agent according to claim 5 or 6, characterized geke Ii ii ζ eich η et that there is a fluorhalo ^ enierteu alipha tir, r] ir; n iiohlenwasserstof 1 ", like Trichlorfluorraetiian, 1,1, '< ^: -'l-ri chloro-1,2,2-trif luoroethane, bromotrif luormeühi-ii, Broir.cl:lordif luomethan, 1, ^ - DibiOm-1,1,2,2-tetx-afluoroethane, 1,2-dibromohexafluoropropane and 3-bromo-1,1,1-trifluorpi ' op: ^{contains y} n. 9) fire extinguishing agents according to one of the. Claims 1 to 8, characterized ge Ic e η η τ. eich et that optionally additionally 0 to 49.9 Ges .- '/ o aliphatic CL- to C -.- Halo ^ enkohleiiv. ^T as £ -erstoff, one or more aliphatic C, - to C ^ _o hydrocarbons, at least one aromatic Cg to C ^ ₀ -Kohlenv / on Hydrogen, a complex uomiscli of hydrocarbons, at least one 30981b / 090? 2 2 Λ R 9 2 O 1-42025 11 iff ' eyeIoaliphatisch.sn C ^ - "to CQ hydrocarbon, at least one carbonyl group-containing (L-" to Cn compound, at least one ester of an aliphatic G ₀ - bis (/ [- carboxylic acid, at least one C ₀ - to Cg ether, contains at least one C ₀ - to C, o-hydroxy compound and / or at least one cyclic ether. 309815 / Π p