DE1621721C3 - Synthetic foam concentrate, especially for extinguishing fires involving organic liquids that are miscible with water - Google Patents

Description

Test series I

Applying the same concentration of 3% Foaming agents both with and without the addition of the same stabilizer, namely lauryl alcohol as well as with and without an addition of alginate, when foaming with a commercially available foaming device on the one hand with fatty acid ethanol amide polyglycol ether (FAP) as a foaming agent and a fatty acid protein condensate (FE) as a foaming agent achieves the following values:

FE stabilizer Alginate Ver Half FAP 0 /
/O schiiu- worth 'Vo (Lauryl Vo mingling Time ¹ Vo alcohol) number (Min.) 3 9.2 6.5 3 3 0.15 7.1 15.5 3 8.1 10 0.15 5 6.0 5.5 3 3 0.15 5 7.5 35 0.15 Phase separation

A laboratory test of the mutual final mixtures for alcohol resistance gave the following values.

Test series Π

However, it is also noteworthy that the mixture of fatty acid protein condensate and stabilizer and alginate as a solution is by no means stable, but soon becomes in separates two liquid phases, so at least in this embodiment of a homogeneous liquid can not be spoken, as it would be valuable for practical use because of the suction There is therefore no uniform extract via admixer. Foaming unit is fed.

ίο The values of the following test series is one much greater alcohol resistance of the foaming agent according to the invention can be seen.

But that means practically avoiding unnecessary losses of foam substance during application on the burning liquid until a sufficient intermediate layer has formed, such as it has been shown that only a small amount of foam bubbles must burst when hitting the alcohol. The results of further tests for comparison

ao of a foaming agent according to the invention and a previously described foam agent, which were compared as according to the invention Compositions of fatty acid ethanol amide polyglycol ether, stabilizer, thermally degraded Na alginate and butyl glycol (designated I) with a composition of sulfonate and the like Additions, as above (designated II), were the following:

Recipe Alcohol test
cold Alcohol test
with flame Sulfonate + stabilizer
■ f-alginate
FAP + stabilizer
+ Alginate 2 min.
32 min. L min.
12 min.

This test was carried out in such a way that on the surface of a filling of 300 ml of methanol in a flat porcelain bowl 1000 ml each under the same conditions using a conventional foam mixer The resulting foam is carefully applied and after the application is complete until it is completely destroyed Elapsed time was measured on the foam blanket. In a parallel experiment, the alcohol was applied before the foam application ignited and again determined the stability of the foam blanket.

From the above test series I it can be seen that when using a fatty acid protein condensate as a foaming agent a foam stabilization is not achieved, but a considerable decrease in the half-life of the foam compared to the stabilized foam made from fatty acid ethanol amide polyglycol ether.

When using sulfonate, stabilizer and alginate, the foam blanket may be due to the initially formed The intermediate layer must be protected against alcohol, but it is weak and not very resistant in itself. the The same conditions are also found in the alcohol test in the presence of fire (test series II).

30th Test method mixture Ver
look Half-life
Time No. mingling number Min. a) Avoid 35 mung I. 7.6 34 as difficult foam II 7.1 16 b) Avoidance mung I. 78 30.5 40 as a means 8th foam II 81 time for 100 ° / ₀ ige 45 Schaumzer disturbance. c) methanol I. 30th test II - 2

The results show the following essential advantages of the foam compositions according to the application.

1. Generation of a much more stable foam in the so-called low-expansion foam area (5- to 10-fold expansion).

2. Can also be used as a middle foam for z. B. Gasoline fires (50 to 200-fold expansion), generated foam very stable.

3. Foam blanket much more stable when giving up on alcohol.

Claims (4)

1 2 should form a protective intermediate layer. Suitable claims: Foaming agents are soaps, lyobipolar sulfates, sulfonates and / or fatty acid protein condensation products 1. Synthetic foaming agent, specifically named. This foam concentrate should be homogeneous for extinguishing organic fires, with 5 liquid in more concentrated, as in any mixed water Miscible liquids, consisting of a ratio that can be used with water a detergent substance as a foaming agent, and have unlimited shelf life. The foam should also from the meeting of foam over the coherent intermediate agent that forms and flammable liquid are particularly effective in maintaining the rest of the layer if one Foam-bearing intermediate layer also forms a high io for the presence of a monovalent, straight-chain polymer Plant or plastics as well as from alcohols of medium and / or higher molecular weight higher fatty alcohol, so weight takes care of it. indicates that the agent is a combination of the nation made of fatty acid ethanol amide polyglycol ethers shielding liquids from interfering separating layer as a foaming agent, an unbranched aliphatic has advantages over stabilization with different fatty alcohol with 10 to 14 carbon atoms as additives of the type mentioned above, but the Foam stabilizer, glycol ether and a thermally ble foam blanket have sometimes quite limited Contains depolymerized alginate. Lifespan and the vulnerability of the educated 2. Synthetic foaming agent according to claim 1, foam against the flammable liquid is characterized in that the foaming agent 20 is not reduced sufficiently in all cases.
Fatty acid ethanol amide polyglycol ether with 4 to It has now been found that certain other 10 is oxyethyl groups. Foaming agents and specially selected additives 3. Synthetic foam concentrate according to claim 2, not only the achievement of a much more stable, characterized in that the foaming agents as well as one when giving up on hydrophilic, organic coconut fatty acid monoethanolamide polyglycol ether 35 niche liquids, such as alcohols more resistant and / or Laurinsäurediäthanolamidpolyglykol- foam, which is advantageous for others ethers with 4 to 10 oxyethyl groups each. Extinguishing purposes, such as gasoline fires, can be used. 4. Synthetic foaming agent according to one or the foaming agent according to the invention, the so several of claims 1 to 3, characterized by also consisting of a detergent substance as foam, that it forms butyl glycol 30 as a leveling agent and when it meets the flammable contains. The liquid loads an intermediate layer that supports the rest of the foam. - ^ - stands and contains a higher fatty alcohol, there is . characterized in that it contains fatty acid ethanol amide i ...... 35 polyglycol ether as a foam-active component, higher The invention relates to a synthetic foam fatty alcohol as a foam stabilizer, a foam agent, which is particularly suitable for deleting regulators and a thermally degraded alginate as Fire contains organic, water-miscible, high-polymer material. As fatty acid ethanol liquids suitable, but fatty acid compounds are also preferred for the control amide polyglycol ethers other objects of fire, such as gasoline fires, with 40 ethanol amide polyglycol ether and of these above all Advantage is usable. -monoethanol and diethanolamide polyglycol ether in For foam concentrates, which are especially for the consideration. Of the latter, in turn, have proven to be particularly fighting fires of organic, mixed with water, a coconut fatty acid mono-ether has proven to be suitable liquid liquids such as methanol, ethanol, acetone nolamidpolyglycol ether with 4 to 10 Oxäthylgruppen and the like should be useful, is a sufficient 45 and lauric acid diethanolamide polyglycol ether. from Resistance to the foam-destroying these aforementioned foaming agents can also The prerequisite for the effect of these hydrophilic liquids is that they can be used together. The as stabil tongue. higher fatty alcohols (C ₁₀ For this purpose, you have the actual foam up to C ₁₄ ), such as lauric, myristic or cetyl alcohol Various kinds of additives have already been added to formers, 5 ° can be added individually or several together to stabilize the foam and this will become partial. Only added during foaming or with the As foam regulators, glycol ethers come before foaming agents to a dilute, ready-to-use, preferably butyl glycol, into consideration. The application Solution processed. - of alginate, such as sodium alginate in thermally depoly- Since the resistance of prepared foam concentrate in some 55 merized state has the advantage of being low Cases is noticeable, but different post-viscosity compared to that of the normally hochmoleteile, such as complicated manufacture, associated with gular alginates to obtain, as they are for the final dissolution should, takes another known method of foam concentrate as a ready-to-use finished product another way, according to which a so-called unity is desired. component foam is produced by 60 The use of fatty acid ethanol amide poly- from soaps and certain foamable washing glycol ethers with 4 to 10 oxyethyl groups leads to active substances as foaming agents in the presence of improved foamability, d. H. increased a foam is generated by substances, which when ready for foam formation, meeting of the foam formed with the burn- Overall, a higher foaming number is achieved liquid, such as methanol, due to their 65 liters and half-lives compared to the Action on the foam, one of the foaming agents available on the burning method known from the art, Liquid floating, the rest of the foam, such as fat protein condensates and sulfonates, such as yourself and the remaining foam applied from the following comparative experiments.