NL2018405B1 - l00% Biodegradable fire extinguishing agent - Google Patents

Abstract

The present invention is in the field of a fully (100%) bio-degradable fire extinguishing agent, a method of extinguishing a fire using said agent, a method of making said agent, and the product obtained by said method. Especially in view of recent victims when using prior art agents a fully biodegradable agent is required under government regulations.

Description

FIELD OF THE INVENTION

The present invention is in the field of a fully (100%) biodegradable fire extinguishing agent, a method of extinguishing a fire using said agent, a method of making said agent, and the product obtained by said method. Especially in view of recent victims when using prior art agents a fully biodegradable agent is required under government regulations.

BACKGROUND OF THE INVENTION

The present invention is in the field of a fully (100%) biodegradable fire extinguishing agent.

Fire may be symbolized by a tetrahedron, which symbol characterizes itself by four (tetra) elements, namely oxygen, heat, fire source, and an uninhibited chain reaction. An optimized agent should preferably provide a chemical/physical action in all four of the tetrahedron domains.

A burning process can be chemically symbolized in the following reaction scheme:

C_nH_m + O2 -^through ignition -+ CO2 +H₂O wherein C_nH_m is a fire source. Ignition is considered to take place through heat. However in reality the reaction is much more complex and typically comprising various intermediate and often incomplete steps. These steps may form radicals. If these could be captured or bounded the fire process may be interrupted and the fire may be easily extinguished.

A typical burning process may be divided into three phases, a growth phase, a burning phase, and an extinguishing phase, each with an accompanying temperature profile. In addition there also is a spatial gradient. A heat gradient has a typical temperature profile from a peripheral temperature of about 20°C to a central temperature of some 1200°C or higher.

Traditional firefighting additives or foams are typically attacking only one of the four sides of the Tetrahedron (cooling down, covering a burning source, removing oxygen, and interrupting the chain reaction) and are therefore often not very effective.

Typical standard tests for extinguishing a fire are given in European norm EN 3-7:2004 +A1: 2007. For extinguishing flammable liquid fires (B Class) with foam products there is a distinction made in the EN standards between miscible (EN 1568-3, March 2008) and immiscible liquids(EN 1568-4, March 2008) . The EN 3-7:2004 +A1: 2007 standard specifies characteristics, performance requirements and test methods for portable fire extinguishers. Reference to the suitability of an extinguisher for use on gaseous fires (class C fires) are at the manufacturer's discretion, but are applied only to powder type extinguishers which have gained a class B or class A and class B rating. Fire extinguishers with a Class A rating are effective against fires involving paper, wood, textiles, and plastics. The primary chemical used to fight these fires is monoammonium phosphate, because of its ability to smother fires in these types of materials. Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. Two commonly used chemicals are effective in fighting these types of fires. Monoammonium phosphate effectively smothers the fire, while sodium bicarbonate induces a chemical reaction which extinguishes the fire .

Various prior art fire extinguishers are available. Water and foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. Foam agents also separate the oxygen element from the other elements. Carbon Dioxide fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle and also be removing the heat with a very cold discharge. Dry Chemical fire extinguishers extinguish the fire primarily by interrupting the chemical reaction of the fire triangle. A widely used type of fire extinguisher is the multipurpose dry chemical that is effective on Class A, B, and C fires. This agent also works by creating a barrier between the oxygen element and the fuel element on Class A fires. Ordinary dry chemical is for Class B & C fires only. It is considered important to use a correct extinguisher for a given purpose. Using an incorrect agent can allow the fire to re-ignite after apparently being extinguished successfully. Carbon dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires. Water extinguishers are for Class A fires only.

The above agents/extinguishers are however typically limited in their applicability, do not extinguish a fire sufficiently, may be toxic to humans and the environment, are not degradable, may not be storage stable, etc.

Hence there still is a need for relative simple and effective method of extinguishing fire and a product therefore, which overcomes one or more of the above mentioned disadvantages without jeopardizing beneficial characteristics.

SUMMARY OF THE INVENTION

The present invention relates in a first aspect to an agent according to claim 1. Said agent comprises various components each providing a contribution to extinguishing a fire and in addition providing a synergistic effect. The agent comprises 0-10 wt.% alkaline halide, such as NaCl, preferably 1-9 wt.%, more preferably 2-8 wt.%, even more preferably 3-7.5 wt.%, such as 5-7 wt.%, 1-20 wt.% dicarboxylic acid, such as Na-bicarbonate, preferably 5-15 wt.%, more preferably 7-12.5 wt.%, such as 8-10 wt.%, 1-40 wt.% phosphate, such as (NH₄)₂HPO4, preferably 10-35 wt.%, more preferably 15-30 wt.%, such as 20-25 wt.%, 2-30 wt.%: sulfate, such as a small amount of Na-lauryl-ether sulfate and a larger amount of (NHUijSCg, preferably 5-25 wt.%, more preferably 10-20 wt.%, such as 12-18 wt.%, 1-25 wt.% diamine, such as urea, preferably

2-20 wt.%, more preferably 5-18 wt.%, such as 10-15 wt.%, 0.1-2 wt.% surfactant, such as glucoside, preferably 0.5-1 wt.%, more preferably 0.2-0.7 wt.%, such as

0.3-0.5 wt.%, 0.02-5 wt.% solvent, such as glycol ether, pref erably 0.1-1 wt.%, more preferably 0.3-0.7 wt.%, such as 0.4-0.5 wt.%, 0.05-2 wt.% foam enhancer, such as ethanol amine, preferably 1-1.5 wt.%, more preferably 1.1-1.4 wt.%, such as 1.2-1.3 wt.%, 0-2 wt.% freezing point depressant, such as glycol, preferably 0.02-1.5 wt.%, such as 0.1-0.5 wt.%, 0.005-2 wt.% rheology modifier, such as xanthan gum, prefera bly 0.02-0.5 wt.%, more preferably 0.05-0.4 wt.%, such as

0.1-0.3 wt.%, and the remainder water. At least one of the above compounds comprises ammonium, typically as cation, and in addition no F is present. Also all of the components are fully biodegradable, non-toxic to human beings and to the environment. Each component may perform various functions. Water evaporates to steam under consumption of large amounts of energy and thereby cools the fire. Ammonium comprising compounds produce ammonium taking away radicals amongst others. The dicarboxylic acid and e.g. urea produce carbon dioxide, thereby taking away oxide amongst others. Phosphate effectively smothers the fire. Sulfate may release a sulfate ion which inhibits reactions. Halides may form acids that interfere with reactions. It is observed that in a fire a wide variations of conditions may exist, such as a variation in temperature, in chemical species present, sub-reactions between chemical species, in oxygen concentration, in an amount of fire source/ingredients thereof, salts being formed, such as slats of the present agent, which conditions may vary over time locally as well. Such makes it difficult to address a fire properly. The present agent is considered to combine most or all of properties of prior art products separately, but now combined into one single product. It is further noted that the fire source can not be influenced much or taken away typically.

The present agent, used as such, diluted in water, or as an intermediate product, is found to be very effective to extinguish a fire, as is supported by tests under standard conditions. In addition the present agent fully decomposes into products not being harmful to the environment and human beings within 28 days under typical conditions. The present agent is stable for longer periods of time, typically more than 3-6 months and hence can be stored for at least said periods. Test under varying temperatures and conditions indicate a storage stability of at least 5 years. In addition it consumes little space, and can therefore also be stored on location, such as a strategic supply, without any problem.

The present products have been tested for toxicity and biodegradability according to TN 161 - 2 2012 -07 (@ANPI Louvain-la-Neuve, report no BFS/EXA/002, TN 161 version 3 of 2016) at a dilution of 4%, a flow rate of 11.4 1/min and a nozzle pressure of 6.3 *100 kPa. The results on toxicity and biodegradability are as follows: 1- Toxicity on Bacteria: EC 50 (30 Min) > 1% ISO 11348-3; 2- Ecotoxicity Fish: EC 50 (96h) > 100mg/L OECD 203; 3- Ecotoxicity daphanids EC 50 (48h) > 100mg/L OECD 202; and 4- Ecotoxicity algea EC 50 (72h) > 100mg/L OECD 201. Biodegradability 100 % in 17 days according to OECD 301B. The products have a density of about 1.14 g/cm³ (EN ISO 12185), a pH of about 7.7 (EN 1568-3 §6), a freezing point of about 0°C, a surface tension of about 22 mN/m (EN 1568-3 §7), a viscosity of about 3.5 mm²/s (EN 1568-3 §5), a conductivity of about 15 mS/cm, being not corrosive (ASTM D 665 and ASTM D130), and appear as light yellow fluids. These are considered very satisfying results, also in view of future government regulations.

In summary the present agent is 100% biodegradable, non Toxic for nature of all kinds, no residues are left behind, liquid starts after the fire acting as a fertilizer, it prevents pollution of unburned particles on big scale, and water use is 70% less when using the present agent, it provides very fast extinguishing of fires, typically six times faster than water, no re-ignition occurs, once the fire is extinguished it will not reignite, it is 100%; biodegradable, it is nontoxic to lower forms of organisms such as bacteria, fish, daphanids and algae, it is not harmful for people, other animals and nature in general, the fire rating is 34A-114B=25F, relating to a standard for a fire extinguisher filled with the present agent, and is multipurpose and can be used for A class, B class and F class fires.

In a second aspect the present invention relates to a method of extinguishing a fire according to claim 14. The present agent can be mixed with water. Typically in a first dilution step 50-500 gr agent are provided per liter water, preferably 100-400 gr/1, such as 200-300 gr/1, e.g. 295 gr/1. The formed solution is typically diluted further in a ratio of solution:water of 1:100 to 1:10, preferably 1:50 to 1:25. Likewise the agent may directly be diluted to 0.5-50 gr/1, such as 5-10 gr/1, and then be used directly, such as by an airplane carrying a load of water with agent. Typically a foam may be formed, or an aerosol, which amongst others blocks oxygen from accessing a fire source.

In a third aspect the present invention relates to forming an agent according to claim 15. Therein first some components are mixed to form a gel, such as in a typical mix6 er. The temperature is typically slightly elevated. Then, at a comparable temperature further water and surfactant are added as a slurry to the gel. The intermediate product is very qualified to be used for extinguishing class A and B fires.

In a fourth aspect the present invention relates to a product obtained by the above method of forming the present agent.

Thereby the present invention provides a solution to one or more of the above mentioned problems and drawbacks. Advantages of the present description are detailed throughout the description.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates in a first aspect to an agent according to claim 1.

In an exemplary embodiment of the present agent comprises 2-20 wt.% ammonium, preferably 10-15 wt.%.

In an exemplary embodiment of the present agent in the alkaline halide the alkaline is selected from Na⁺, K⁺, NH₄ ⁺, and Ca²⁺, and wherein the halide is selected from Cl“, and Br~, and combinations thereof, preferably Na⁺ and Cl”.

In an exemplary embodiment of the present agent the bicarbonate is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Ca²⁺ dicarboxylic acid, and combinations thereof, wherein the dicarboxylic acid is selected from bicarbonate, oxalic acid, malonic acid, succinic acid, glutaric acid, and combinations thereof.

In an exemplary embodiment of the present agent in the phosphate the cation is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Ca⁺, and combinations thereof.

In an exemplary embodiment of the present agent in the sulfate the cation is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Ca^z+, and combinations thereof.

In an exemplary embodiment of the present agent the diamine is selected from one or more of primary and secondary diamines, such as alkyl diamine (R(NHR^,)₂), alkanol diamine(ROH(NHR')2) , aldehyde diamine (R=O(NHR')₂) , imine diamine (R=N(NHR')2) , aromatic diamine, such as phenylenediamine, urea (C=O (NHR') ₂) , N,N'-dialkylurea ( (NRH)C=O(NR'H) ), N-monoalkylurea ( (NHR)C=O(NHR') ) , wherein each R and R' is independently selected from C1-C12 alkyls, and R' is also selected from H, preferably C-i-Cg alkyls, such as methyl, ethyl, propyl, iso-propyl, butyl, pentyl, and hexyl, such as N,N'-dimethylurea, N,Ν'-diethylurea, N,N'-methylethylurea, preferably urea.

In an exemplary embodiment of the present agent the foam enhancer is selected from mono- and di-Ci-Cg alkanol amines .

In an exemplary embodiment of the present agent the solvent is selected from alkyl ethers of alkylene glycol, such as propylene glycol n-butyl ether and tripropylene glycol monobutyl ether.

In an exemplary embodiment of the present agent the rheology modifier is selected from polysaccharides.

In an exemplary embodiment of the present agent the surfactant is selected from C1-C12 polyglucosides.

In an exemplary embodiment the present agent comprises one or more of NaCl, (NH₄)HSO₄, (NH₄)₂HPO₄, NaHCO₃, Na₂CO₃, Urea, C1-C12 polyglucoside, C-i-Cg alkanol amine, sodium lauryl ether sulfate, Ci-Ce glycol n-Ci-C6 ether, and polysaccharide.

In an exemplary embodiment of the present agent the agent is a powder.

In an exemplary embodiment the method of forming the present agent comprises finely grinding 5-10 wt.% alkaline diamine, sulfate and di-carboxylic acid into a powder, such as in a hammer mill, mixing the alkaline halides and phosphate to the powder, such as in a Nauta mixer, and further mixing 1-5 wt.% of the gel to 95-99 wt.% of the powder, such as by injecting, wherein all wt.% are based on the final agent. The obtained product is found especially suitable, e.g. used as such or in a solution, for extinguishing class A fires.

The one or more of the above examples and embodiments may be combined, falling within the scope of the invention.

FIGURES

Figure 1-3: Temperature of a class 34A test fire in seconds after extinguishing commences at 0 seconds.

DETAILED DESCRIPTION OF THE FIGURES

The figures are detailed throughout the description.

EXAMPLES

The invention is further detailed by the accompanying example, which is exemplary and explanatory of nature and are not limiting the scope of the invention. To the person skilled in the art it may be clear that many variants, being obvious or not, may be conceivable falling within the scope of protection, defined by the present claims.

Example

Preparation of fire extinguishing agent

A fire extinguishing agent was prepared by mixing two inter-mediate products, EXI and EX2. EXI is a gel that comprises the compounds and their respective weight percentages listed in table 1.

Table 1: Composition of EX1

Compound	Weight percentage
Ethanolamine	8
Tripropylene glycol monobutyl ether	4
Sodium Lauryl ether sulfate	1.12
Xanthan gum	1
Water	50.88
Alkyl polyglucoside	35

Ethanolamine, Tripropylene glycol monobutyl ether, sodium lauryl ether sulfate, and xanthan gum were mixed according to the percentages listed in table 1, together with half of the water (25.44 % by weight) at a temperature of 40°C.

Thereafter alkyl polyglucoside (35 % by weight) was mixed with the remainder of the water (25.44 % by weight), heated, and converted to a slurry. During mixing, the slurry is added to the mixture of ethanolamine, tripropylene glycol monobutyl ether, Na-lauryl ether sulfate, xanthan gum, and water at a temperature of 40°C to obtain intermediate product EXI.

Subsequently, intermediate product EX2 is prepared by using the compounds and their respective weight percentages listed in table 2.

Table 2: Composition of EX2

Compound	Weight percentage
Sodium chloride	7.7
Di-ammonium phosphate (DAP)	34.6
Sodium bicarbonate	15.4
Urea	19.3
Ammonium sulfate	23

Sodium bicarbonate, urea, and ammonium sulfate are finely ground using a hammer mill. These three compounds are mixed with sodium chloride and diammonium phosphate in a Nauta mixer in the weight percentages listed in table 2, resulting in intermediate product EX2. A small percentage of EXI (2% by weight) is injected in intermediate product EXI, resulting in a fine powder.

Test 1

A Class 34A (114B) fire test (EUROPEAN STANDARD EN

3-7:2004+Al, August 2007, page 34-38) was conducted (@ANPI Louvain-la-Neuve, test report BFS/EXA/002, EN3-7) to compare the time required to extinguish the class A fire using the fine powder or water; at ANPI the measurements were performed using a 4% dilution with either water or seawater. The temperature of the class 34A fire was measured during the extinguishing process and is given in figure 1, wherein Xecosol FX is the fire agent EX2 above. About 30 seconds after extinguishing commences, the fire is completely extinguished when the present powder is used. The extinguishing process was continued up to 180 seconds. No reigniting occurred and the fire source, wood, could be touched with bare hands. In comparison, when drinking water was used, the class 34A test fire was fully extinguished after 240 second, but the wood could not be touched with bare hands. However, 120 seconds later, the pile of wood spontaneously reignited by the heat that remained in the wood after the fire was extinguished. The class 34A fire test was repeated using seawater, but no differences compared to drinking water were observed.

Test 2

Using a similar approach as above the EXI agent

Xecosol B) was used to extinguish a class B fire source, as is shown in fig. 2 (same ANPI report as above). After a few minutes the fire was extinguished and remained extinguished, which was found better than the comparative foam.

Test 3

Using a similar approach as above the EXI agent (Xecosol FX) was used to extinguish a class A fire source, as is shown in fig. 3. After a few seconds the fire was extinguished and remained extinguished, which was found better than the comparative water. So the present Xecosol FX in liquid form extinguishes the fire in about 6 seconds and the temperature is linear reduced from 680°C to 80 C. The prior art water temperature after 3 seconds is in contrast increasing again from 290° to 720° through water evaporation into steam. It reaches a similar temperature as Xecosol FX only after 26 seconds. As noted for fig. 1 after some time when using water the fire source will reignite. Fig. 3 is an enlargement of fig. 1 left section.

For the purpose of searching prior art the following section is added, representing a translation of the last section in English:

1. Fully biodegradable fire extinguishing agent comprising

0-10 wt. % alkaline halide, preferably 2-8 wt.%,

1-20 wt.% dicarboxylic acid, preferably 5-15 wt.%,

1- 40 wt.% phosphate, preferably 10-35 wt.%,

2- 30 wt.% sulfate, preferably 5-25 wt.%,

1-25 wt.% diamine, preferably 2-20 wt.%,

0.1-2 wt.% surfactant, preferably 0.5-1 wt.%,

0.02-5 wt.% solvent, preferably 0.1-1 wt.%,

0.05-2 wt.% foam enhancer, preferably 1-1.5 wt.%,

0-2 wt.% freezing point depressant, preferably

0.02-1.5 wt.%,

0.005-2 wt.% rheology modifier, preferably 0.02-0.5 wt.%, the remainder water, with the proviso that at least one compound comprises ammonium, and with the proviso that no F is present, wherein all wt.% are relative to a total weight of the composition.

2. Agent according to embodiment 1, comprising 2-20 wt.% ammonium, preferably 10-15 wt.%.

3. Agent according to any of the preceding embodiments, wherein in the alkaline halide the alkaline is selected from Na⁺, K⁺, NH₄ ⁺, and Ca⁺, and wherein the halide is selected from Cl^-, and Br~, and combinations thereof, preferably Na⁺ and Cl“.

4. Agent according to any of the preceding embodiments, wherein the bicarbonate is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Caⁱ⁺ dicarboxylic acid, and combinations thereof, wherein the dicarboxylic acid is selected from bicarbonate, oxalic acid, malonic acid, succinic acid, glutaric acid, and combinations thereof.

5. Agent according to any of the preceding embodiments, wherein in the phosphate the cation is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Ca²⁺, and combinations thereof.

6. Agent according to any of the preceding embodiments, wherein in the sulfate the cation is selected from Na⁺, K⁺, NH₄ ⁺, H⁺, and Ca^z+, and combinations thereof.

7. Agent according to any of the preceding embodiments, wherein the diamine is selected from one or more of primary and secondary diamines, such as alkyl diamine (R(NHR^,)₂), alkanol diamine(ROH(NHR')₂) , aldehyde diamine (R=O (NHR'') ₂) , imine diamine (R=N (NHR' ) ₂) , aromatic diamine, such as phenylenediamine, urea (C=O (NHR') ₂) , Ν,Ν'-dialkylurea((NRH)C=O(NR'H)), N-monoalkylurea ((NHR)C=O(NHR')), wherein each R and R' is independently selected from C1-C12 alkyls, and R' is also selected from H, preferably Ci-Cg alkyls, such as methyl, ethyl, propyl, iso-propyl, butyl, pentyl, and hexyl, such as N,N'-dimethylurea, N,N'diethylurea, N,N'-methylethylurea, preferably urea.

8. Agent according to any of the preceding embodiments, wherein the foam enhancer is selected from mono- and di-Ci-C6 alkanol amines.

9. Agent according to any of the preceding embodiments, wherein the solvent is selected from alkyl ethers of alkylene glycol.

10. Agent according to any of the preceding embodiments, wherein the rheology modifier is selected from polysaccharides .

11. Agent according to any of the preceding embodiments, wherein the surfactant is selected from C-1-C-12 polyglucosides.

12. Agent according to any of the preceding embodiments, comprising one or more of NaCl, (NHJHSCy, (NH₄) 2HPO4, NaHCCy, Na?CO3, Urea, C1-C12 polyglucoside, Ci-Cg alkanol amine, sodium lauryl ether sulfate, Ci-Cê glycol n-Ci-Cg ether, and polysaccharide .

13. Agent according to any of the preceding embodiments, wherein the agent is a powder.

14. Method of extinguishing a fire comprising providing an agent according to any of the preceding embodiments, mixing said agent with water thereby forming a mixture, and extinguishing a fire with said mixture.

15. Method of forming an agent according to any of embodiments 1-13 comprising mixing 4-10 wt. % foam enhancer, 2-5 wt. % solvent, 0.2-2 wt. % sulfate, 0.1-2 wt. % rheology modifier and 30-70% of the water into a gel at a temperature of 10-50 °C, preferably at 25-40 °C, mixing 20-50 wt. % surfactant and the remainder of the water at a temperature ±5 °C of the gel therewith forming a slurry and adding the slurry to the gel.

16. Method according to embodiment 15, further comprising finely grinding 5-10 wt. % alkaline diamine, sulfate and dicarboxylic acid into a powder, mixing the alkaline halides and phosphate to the powder, and further mixing 1-5 wt. % of the gel to 95-99 wt. % of the powder, wherein all wt. % are based on the final agent.

17. Product obtained by a method according to any of embodiments 15-16.

Claims (17)

CONCLUSIONS A fully biodegradable fire extinguishing agent 0-10 wt 1-20 wt 1-40 wt Ο 2-30 wt.% 1-25 wt. 0.1-2 wt. Alkaline halide, preferably 2-8 wt.%, Dicarboxylic acid, phosphate, sulfate, diamine, surfactant, preferably 5-15, preferably preferred 10-35 wt 5-25 wt 2-20% by weight, preferably 0.5-1% by weight, 0.02-5 wt.% Of solvent, preferably 0.1-1 wt ^1? ·, 0.05-2% by weight of foam booster, preferably 1-1.5% by weight, 0-2% by weight of freezing point depressant, preferably 0.02-1.5% by weight, 0.005-2% by weight rheology modifier, preferably 0.02-0.5% by weight, the remainder of water, with the proviso that at least one compound comprises ammonium, and with the proviso that no F is present, wherein all weight% are based on a total weight of the composition. A fire extinguishing agent according to claim 1, comprising 2-20% by weight; ammonium, preferably 10-15% by weight. A fire extinguishing agent according to any one of the preceding claims, wherein in the alkaline halide the alkaline is selected from Na ⁺ , K ⁺ , NH 4 ⁺ , and Ca ²⁺ , and wherein the halide is selected from Cl ^- and Br ', and combinations thereof, at preferably Na ⁺ and Cl ". A fire extinguishing agent according to any one of the preceding claims, wherein the bicarbonate is selected from Na ⁺ , K ⁺ , NH 4 ⁺ , H ⁺ and Ca ¹⁺ dicarboxylic acid, and combinations thereof, wherein the dicarboxylic acid is selected from bicarbonate, oxalic acid, malonic acid, succinic acid, glutaric acid , and combinations thereof. A fire extinguishing agent according to any one of the preceding claims, wherein in the phosphate the cation is selected from Na ⁺ , K ⁺ , NH ₄ ⁺ , H ⁺ and Ca ⁺ , and combinations thereof. A fire extinguishing agent according to any one of the preceding claims, wherein in the sulfate the cation is selected from Na ⁺ , K ⁺ , NH ₄ ⁺ , H ⁺ and Ca ¹⁺ , and combinations thereof. A fire extinguishing agent according to any one of the preceding claims, wherein the diamine is selected from one or more primary and secondary diamines, such as alkyl diamine (R (NHR ') ₂ ), diamine alkanol (ROH (NHR') ₂ ), aldehyde diamine (R = O (NHR ') ₂ ), imine diamine (R = N (NHR') ₂ ), aromatic diamine such as phenylenediamine, urea (C = O (NHR ') ₂ ), N, N'-dialkyl urea ((NRH) C = O (NR 1 H)), N-monoalkyl urea ((NHR) C = O (NHR ')), wherein each R and R' are independently selected from C 1 -C 12 alkyls and R 'is also selected from H, preferably C 1 -C 8 alkyls, such as methyl, ethyl, propropyl, iso-propyl, butyl, pentyl and hexyl, such as N, N'-dimethyl urea, N, N'-diethyl urea, N, N'-methyl ethyl urea, preferably urea. A fire extinguishing agent according to any one of the preceding claims, wherein the foam enhancer is selected from mono- and di-C 1 -C 6 alkanolamines. A fire extinguishing agent according to any one of the preceding claims, wherein the solvent is selected from alkyl ethers of alkylene glycol. A fire extinguishing agent according to any one of the preceding claims, wherein the rheology modifier is selected from polysaccharides. A fire extinguishing agent according to any one of the preceding claims, wherein the surfactant is selected from C 1 -C ₁₂ polyglucosides. A fire extinguishing agent according to any one of the preceding claims, comprising one or more of NaCl, (NH ₄ ) HSO ₄ , (NH ₄ ) ₂ HPO 4, NaHCO ₃ , Na ₂ CO ₃ , urea, C 1 -C 12 polyglucoside, C 1 -C 8 alkanolamine , sodium lauryl ether sulfate, C 1 -C 8 n-C 1 -C 8 ether, and polysaccharide. A fire extinguishing agent according to any one of the preceding claims, wherein the fire extinguishing agent is a powder. A method for extinguishing a fire, comprising providing a fire extinguishing agent according to any one of the preceding claims, mixing the fire extinguishing agent with water to form a mixture, and extinguishing a fire with this mixture. A method for forming a fire extinguishing agent according to any one of claims 1-13, comprising mixing 4-10% by weight of foam booster, 2-5% by weight of solvent, 0.2-2% by weight of sulphate, 0, 1-2% by weight: rheology modifier, and 30-70% of the water to a gel at a temperature of 10-50 ° C, preferably at 25-40 ° C, mixing 20-50% by weight of surface active substance and the rest of the water at a temperature of ± 5 ° C of the gel thereby forming a suspension and adding the suspension to the gel. The method of claim 15, further comprising finely grinding 5-10% by weight of alkaline diamine, sulfate, and dicarboxylic acid into a powder, mixing the alkaline halide and phosphate with the powder, and further mixing 1-5% by weight. % of the gel with 95-99% by weight of the powder, all% by weight being based on the final fire extinguishing agent. 17. Product obtained with a method according to any one of claims 15-16. 1/1 Time in seconds