TWI806972B - Extinguishing agent - Google Patents

Abstract

The object of the present invention is to provide a fire extinguishing agent that has both high fire extinguishing performance and high safety to the human body, and uses a small amount of natural surfactant. The solution is that the present invention is composed of 1 or 2 or more carboxylic acid alkali metal salts selected from potassium acetate, potassium citrate, sodium acetate and sodium citrate; 1 or 2 or more natural surfactants selected from lecithin, saponin and casein, and water. In 100 milliliters of the total amount, the carboxylic acid alkali metal salt is contained in a ratio of 30 to 55 g and the natural surfactant is 0.107 to 0.200 g. The content ratio of surfactant is based on the mass ratio of alkali metal salt of carboxylic acid:natural surfactant=150:1～275:1.

Description

Extinguishing agent

The present invention relates to a fire extinguishing agent used in fire extinguishers, fire extinguishing devices or fire extinguishing equipment.

As a general water-based fire extinguishing agent, there is an enhanced liquid fire extinguishing agent (an aqueous solution of potassium carbonate with a concentration of 35 to 40% by volume). It is effective against Class A fires (ordinary fires), Class B fires (oil fires) and Class C fires (electrical fires), especially for frying oil fires. However, since it is a strong alkaline with a pH of 12-13, care should be taken when handling it. Conventional fire extinguishing agents containing enhanced liquid fire extinguishing agents have not yet ensured the safety of their ingredients to the human body. In places where directly or indirectly edible items such as beverages and food or their packaging are handled, when the fire extinguishing agent is released due to fire or improper operation, it is necessary to wash or discard the articles attached to the fire extinguishing agent. That is to say, because the safety of the fire extinguishing agent components to the human body has not been ensured, besides the fire, the direct victims of the fire also suffer secondary damage due to the attachment of the fire extinguishing agent, and it is required to reduce the occurrence of such situations.

Patent Document 1 discloses a fire extinguishing agent, wherein in 100 milliliters of the total amount, 20-55 g of alkali metal carboxylate and 0.10-2.0 g of natural surfactant are contained, and the content ratio of alkali metal carboxylate to natural surfactant is the alkali metal carboxylate:natural surfactant=30:1-100:1 in mass ratio. According to Patent Document 1, a fire extinguishing agent having both high fire extinguishing performance and high safety to the human body can be obtained. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2009-291257

[Problem to be Solved by the Invention]

Since natural surfactants are expensive, only a small reduction in their usage can yield significant cost advantages. However, since the natural surfactant has the effect of foaming and covering the surface of the object to be extinguished, if the amount of the natural surfactant is reduced, the fire extinguishing performance will be deteriorated. According to Patent Document 1, although it depends on the content ratio of alkali metal carboxylate and natural surfactant, when the natural surfactant is mixed in a ratio of 1 to 2 g in the total amount of 100 ml, the fire extinguishing performance is "○" for any of Class A fire, Class B fire and frying oil fire and is particularly effective (Examples 6-3, 6-4, 10-3, 10-4, etc.). On the other hand, it shows that when the natural surfactant is mixed in a ratio of 0.05 to 0.20 g in a total amount of 100 ml, at least one of the fire extinguishing performance against Class A fires, Class B fires, and frying oil fires is "△" or "×" (Examples 6-1, 6-2, 10-1, 10-2, etc.).

Therefore, the purpose of the present invention is to provide a fire extinguishing agent that has both high fire extinguishing performance and high safety to the human body, and uses a small amount of natural surfactant. [Means to solve the problem]

The fire extinguishing agent of the present invention according to claim 1 is characterized in that: it is made of carboxylic acid alkali metal salt formed by one or more kinds selected from potassium acetate, potassium citrate, sodium acetate and sodium citrate; it is composed of one or two kinds or more natural surfactants selected from lecithin, saponin and casein, and water; The ratio of g contains, the ratio of the content of the aforementioned alkali metal carboxylate salt to the aforementioned natural surfactant is the aforementioned alkali metal carboxylate: the aforementioned natural surfactant=150:1-275:1 in terms of mass ratio.

The present invention of claim 2 is in the fire extinguishing agent of claim 1, wherein the alkali metal carboxylate salt is obtained by mixing either or both of acetic acid and citric acid with either or both of potassium carbonate and sodium carbonate and reacting them.

In the present invention of Claim 3, in the fire extinguishing agent of Claim 1 or Claim 2, the lower alcohol designated as a food additive with a carbon number of 4 or less is contained in a mass ratio relative to the aforementioned natural surfactant: the aforementioned natural surfactant: the aforementioned lower alcohol = 1:2 to 1:40.

The present invention of claim 4 is in the fire extinguishing agent of any one of claim 1 to claim 3, and its pH is 5.5-8.5. [Effect of Invention]

According to the fire extinguishing agent of the present invention, it is possible to provide a fire extinguishing agent which has both high fire extinguishing performance and high safety to human body, and uses less natural surfactant.

[Mode of Implementing the Invention]

The fire extinguishing agent according to the first embodiment of the present invention is composed of carboxylic acid alkali metal salt composed of one or more kinds selected from potassium acetate, potassium citrate, sodium acetate and sodium citrate; natural surfactant and water formed by one or more kinds selected from lecithin, saponin and casein; The content ratio of salt to natural surfactant is based on the mass ratio of alkali metal salt of carboxylic acid:natural surfactant=150:1～275:1. According to this embodiment, it is possible to provide a fire extinguishing agent that has both high fire extinguishing performance and high safety to the human body, and uses a small amount of natural surfactant.

Carboxylic acid alkali metal salts are effective components for extinguishing Class A fires (ordinary fires) and frying oil fires. Natural surfactants have the effect of inhibiting the evaporation and diffusion of flammable gases in Class B fires (oil fires) by foaming and covering the surface of the fire extinguishing object. Therefore, according to the present embodiment, it is possible to provide a fire extinguishing agent having a high fire extinguishing performance against any one of Class A fire (ordinary fire), Class B fire (oil fire), and frying oil fire. In addition, because the fire extinguisher system for Class C fire (electrical fire) only has the fire extinguishing agent spraying method different from other fire extinguishers for fire, the fire extinguisher system of this embodiment has high fire extinguishing performance that can also be used as Class C fire (electrical fire).

In addition, among the alkali metal salts of carboxylic acids, potassium citrate, sodium acetate and sodium citrate are ingredients approved as food additives in Japan. Potassium acetate is an ingredient confirmed to be safe for humans according to the results of the safety assessment test of JECFA (Joint Expert Committee on Food Additives) under FAO (Food and Agriculture Organization of the United Nations) and WHO (World Health Organization). It is used as a food additive in EU countries. Lecithin, saponin and casein are ingredients approved as food additives in Japan. Therefore, the fire extinguishing agent of this embodiment can ensure high safety to the human body. Also, the fire extinguishing agent of this embodiment can be added with additives as required, but the additives should be components designated as food additives.

In addition, if the content of carboxylic acid alkali metal salt is less than 20g, the fire extinguishing performance of Class A fire, Class B fire, and frying oil fire is insufficient (failed in the test stipulated in the Japanese Ministry of Internal Affairs and Communications "Ministry of Technical Specifications for Fire Extinguishers"). If the content of the alkali metal carboxylate exceeds 55g, it will easily change over time, and it is unqualified in the deterioration test stipulated in the Japanese Ministry of Internal Affairs and Communications' "Ministry of Technical Specifications for Fire Extinguishers". If the content of the natural surfactant is less than 0.100 g, the fire extinguishing performance of Class A fires and Class B fires will be insufficient. When content of a natural surfactant exceeds 2.00g, it will change easily with time.

The second embodiment of the present invention is that in the fire extinguishing agent of the first embodiment, the alkali metal carboxylate is obtained by mixing either or both of acetic acid and citric acid with either or both of potassium carbonate and sodium carbonate and reacting them. According to this embodiment, the carboxylic acid alkali metal salt obtained by mixing either one or both of acetic acid and citric acid, and either one or both of potassium carbonate and sodium carbonate, and reacting them can be used. Acetic acid, citric acid, potassium carbonate and sodium carbonate are ingredients approved as food additives in Japan.

In the third embodiment of the present invention, in the fire extinguishing agent of the first or second embodiment, the lower alcohol designated as a food additive with a carbon number of 4 or less is contained in a mass ratio of natural surfactant:lower alcohol=1:2 to 1:40 relative to the natural surfactant. According to this embodiment, fire extinguishing performance can be improved. Glycerin, propylene glycol, polyethylene glycol, etc. are mentioned as a lower alcohol with 4 or less carbon atoms designated as a food additive.

In the fourth embodiment of the present invention, the fire extinguishing agent in any one of the first to third embodiments has a pH of 5.5 to 8.5. According to this embodiment, corrosion of a fire extinguisher etc. can be prevented. In addition, if the pH is less than 5.5, iron and aluminum are easily corroded. If the pH exceeds 8.5, aluminum is easily corroded. [Example]

Hereinafter, the fire extinguishing agent of an embodiment of the present invention will be described. [Comparative Example 1-1] Put 30 g of potassium acetate and 0.050 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "600:1". [Comparative example 1-2] Put 30 g of potassium acetate and 0.100 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "300:1". [Comparative example 1-3] Put 30 g of potassium acetate and 0.107 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "280:1". [Example 1-1] Put 30 g of potassium acetate and 0.111 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "270:1". [Example 1-2] Put 30 g of potassium acetate and 0.115 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "260:1". [Example 1-3] Put 30 g of potassium acetate and 0.150 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "200:1". [Example 1-4] Put 30 g of potassium acetate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "150:1". In addition, in Comparative Example 1-1 to Comparative Example 1-3 and Example 1-1 to Example 1-4, commercially available potassium acetate can be used, but for example, 18.4 g of acetic acid (molecular weight 60) with a purity of 100% and 16.2 g of potassium carbonate (molecular weight 138) with a purity of 99.5% can be used.

[Comparative Example 2-1] Put 30 g of potassium acetate and 0.050 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "600:1". [Comparative example 2-2] Put 30 g of potassium acetate and 0.100 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "300:1". [Comparative example 2-3] Put 30 g of potassium acetate and 0.107 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "280:1". [Example 2-1] Put 30 g of potassium acetate and 0.111 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "270:1". [Example 2-2] Put 30 g of potassium acetate and 0.115 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "260:1". [Example 2-3] Put 30 g of potassium acetate and 0.150 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "200:1". [Example 2-4] Put 30 g of potassium acetate and 0.200 g of lecithin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: lecithin" in this fire extinguishing agent is "150:1". In addition, in Comparative Example 2-1 to Comparative Example 2-3 and Example 2-1 to Example 2-4, commercially available potassium acetate can be used, but it can also be used, for example, by mixing 18.4 g of 100% pure acetic acid (molecular weight 60) and 16.2 g of 99.5% pure potassium carbonate (molecular weight 138), reacting it at below 50° C., and then performing a purification step.

[Comparative Example 3-1] Put 30 g of potassium acetate and 0.050 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "600:1". [Comparative Example 3-2] Put 30 g of potassium acetate and 0.100 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "300:1". [Comparative Example 3-3] 30 g of potassium acetate and 0.107 g of casein were put into a container, and water was added to adjust to 100 ml, followed by stirring to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "280:1". [Example 3-1] Potassium acetate 30 g and casein 0.111 g were put in a container, water was added to adjust to 100 ml, and the mixture was stirred to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "270:1". [Example 3-2] Put 30 g of potassium acetate and 0.115 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "260:1". [Example 3-3] Put 30 g of potassium acetate and 0.150 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "200:1". [Example 3-4] Put 30 g of potassium acetate and 0.200 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: casein" in this fire extinguishing agent is "150:1". In addition, in Comparative Example 3-1 to Comparative Example 3-3 and Example 3-1 to Example 3-4, commercially available potassium acetate can be used, but for example, 18.4 g of 100% pure acetic acid (molecular weight 60) and 16.2 g of 99.5% pure potassium carbonate (molecular weight 138) can be used.

[Comparative Example 4-1] Put 30 g of potassium acetate, 0.030 g of saponin, 0.010 g of lecithin and 0.010 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "600:1". [Comparative Example 4-2] Put 30 g of potassium acetate, 0.060 g of saponin, 0.030 g of lecithin, and 0.010 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "300:1". [Comparative Example 4-3] Put 30 g of potassium acetate, 0.060 g of saponin, 0.030 g of lecithin and 0.017 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "280:1". [Example 4-1] Put 30 g of potassium acetate, 0.070 g of saponin, 0.030 g of lecithin, and 0.011 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "270:1". [Example 4-2] Put 30 g of potassium acetate, 0.070 g of saponin, 0.030 g of lecithin and 0.015 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "260:1". [Example 4-3] Put 30 g of potassium acetate, 0.080 g of saponin, 0.040 g of lecithin, and 0.030 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "200:1". [Example 4-4] Put 30 g of potassium acetate, 0.100 g of saponin, 0.060 g of lecithin, and 0.040 g of casein into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate:surfactant" in this fire extinguishing agent is "150:1". In addition, in Comparative Example 4-1 to Comparative Example 4-3 and Example 4-1 to Example 4-4, commercially available potassium acetate can be used, but for example, 18.4 g of 100% pure acetic acid (molecular weight 60) and 16.2 g of 99.5% pure potassium carbonate (molecular weight 138) can be used.

[Compilation of Comparative Example 1-1 to Comparative Example 4-3 and Example 1-1 to Example 4-4] The pH was measured for each fire extinguishing agent of Comparative Example 1-1 to Comparative Example 4-3 and Example 1-1 to Example 4-4. In addition, regarding the fire extinguishing performance of Class A fires, Class B fires, and frying oil fires, the fire extinguishing experiments of the A-1 model and the B-1 model were carried out in accordance with the test method of the Japanese Ministry of Internal Affairs and Communications "Ministry Order for Establishing Technical Specifications for Fire Extinguishers". In addition, regarding frying oil fires, experiments were also carried out in accordance with the test method in accordance with the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". When extinguishing a fire, each fire extinguishing agent is filled in a 3L accumulator type fire extinguisher, and the fire extinguishing agent is sprayed on the fire extinguishing model from the spray nozzle installed in the fire extinguisher.

In terms of fire extinguishing performance, those who did not burn again within the specified time (2 minutes for class A fires, and 1 minute for class B fires and frying oil fires) were rated as "○"; those who were temporarily extinguished but caught fire again within the specified time were rated as "△"; In addition, the deterioration test is carried out in accordance with the "deterioration test" stipulated in the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". As a result, those with no change in any of appearance, pH, and specific gravity were rated as "○"; those with changes in one or more of appearance, pH, and specific gravity were rated as "×". These results are shown in Table 1 for Comparative Example 1-1 to Comparative Example 1-3 and Example 1-1 to Example 1-4, respectively; Table 2 for Comparative Example 2-1 to Comparative Example 2-3 and Example 2-1 to Example 2-4; Table 3 for Comparative Example 3-1 to Comparative Example 3-3 and Example 3-1 to Example 3-4; .

As shown in Tables 1 to 4, it can be seen that the fire extinguishing agent of this embodiment, even if the ratio of the natural surfactant in the total amount of 100 milliliters is reduced to below 0.200 g, by making potassium acetate 30 g, the natural surfactant composed of one or more kinds selected from lecithin, saponin, and casein is contained in a ratio of 0.107 to 0.200 g, and the ratio of the content of the alkali metal carboxylate to the natural surfactant is expressed as carboxylate by mass ratio. Acid-alkali metal salt: natural surfactant = 150:1~270:1, still has high fire extinguishing performance for Class A fires, Class B fires and frying oil fires, all of which are "○". Also, since the result of the deterioration test was "◯", the quality retention was also excellent. Furthermore, since potassium acetate is used as a food additive in EU countries, and lecithin, saponin and casein are approved as food additives in Japan, the safety to the human body is also high.

[Comparative Example 5-1] Put 20 g of potassium acetate and 0.170 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "117:1". In addition, commercially available potassium acetate can be used, but for example, one obtained by mixing 12.2 g of acetic acid (molecular weight 60) with a purity of 100% and potassium carbonate (molecular weight 138) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used. [Comparative Example 5-2] Put 20 g of potassium acetate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "100:1". In addition, commercially available potassium acetate can be used, but for example, one obtained by mixing 12.0 g of acetic acid (molecular weight 60) with a purity of 100% and potassium carbonate (molecular weight 138) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used. [Example 5-1] Put 50 g of potassium acetate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium acetate: saponin" in this fire extinguishing agent is "250:1". In addition, commercially available potassium acetate can be used, but for example, one obtained by mixing 30.6 g of acetic acid (molecular weight 60) with a purity of 100% and potassium carbonate (molecular weight 138) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used.

[Comparative Example 6-1] Put 20 g of potassium citrate and 0.170 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium citrate: saponin" in this fire extinguishing agent is "117:1". [Comparative Example 6-2] Put 20 g of potassium citrate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium citrate: saponin" in this fire extinguishing agent is "100:1". In addition, in Comparative Example 6-1 and Comparative Example 6-2, commercially available potassium citrate can be used, but for example, 11.9 g of citric acid (molecular weight: 192) with a purity of 100% and 12.8 g of potassium carbonate (molecular weight: 138) with a purity of 99.5% can be used. [Example 6-1] Put 50 g of potassium citrate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "potassium citrate: saponin" in this fire extinguishing agent is "250:1". In addition, commercially available potassium citrate can be used, but for example, one obtained by mixing 29.6 g of citric acid (molecular weight 192) with a purity of 100% and potassium carbonate (molecular weight 138) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used.

[Comparative Example 7-1] Put 20 g of sodium acetate and 0.170 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium acetate: saponin" in this fire extinguishing agent is "117:1". [Comparative Example 7-2] Put 20 g of sodium acetate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium acetate: saponin" in this fire extinguishing agent is "100:1". In addition, in Comparative Example 7-1 and Comparative Example 7-2, commercially available sodium acetate can be used, but for example, 14.6 g of acetic acid (molecular weight: 60) with a purity of 100% and 12.9 g of sodium carbonate (molecular weight: 106) with a purity of 99.5% can be used. [Example 7-1] Put 50 g of sodium acetate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium acetate: saponin" in this fire extinguishing agent is "250:1". In addition, commercially available sodium acetate can be used, but for example, one obtained by mixing 36.6 g of acetic acid (molecular weight 60) with a purity of 100% and sodium carbonate (molecular weight 106) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used.

[Comparative Example 8-1] Put 20 g of sodium citrate and 0.170 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium citrate: saponin" in this fire extinguishing agent is "117:1". [Comparative Example 8-2] Put 20 g of sodium citrate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium citrate: saponin" in this fire extinguishing agent is "100:1". In addition, in Comparative Example 8-1 and Comparative Example 8-2, commercially available sodium citrate can be used, but for example, 13.1 g of citric acid (molecular weight: 192) with a purity of 100% and 10.8 g of sodium carbonate (molecular weight: 106) with a purity of 99.5% can be used. [Example 8-1] Put 50 g of sodium citrate and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "sodium citrate: saponin" in this fire extinguishing agent is "250:1". In addition, commercially available sodium citrate can be used, but for example, one obtained by mixing 32.7 g of citric acid (molecular weight 192) with a purity of 100% and sodium carbonate (molecular weight 106) with a purity of 99.5% and reacting at 50° C. or lower, followed by a purification step can also be used.

[Compilation of Comparative Example 5-1 to Comparative Example 8-2 and Example 5-1 to Example 8-1] The pH was measured for each fire extinguishing agent of Comparative Example 5-1 to Comparative Example 8-2 and Example 5-1 to Example 8-1. In addition, with regard to the freezing point and the fire extinguishing performance of Class A fires, Class B fires, and deep-fried oil fires, the test method of the A-1 model and B-1 model fire extinguishing experiments and the determination of the freezing point were carried out in accordance with the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order for Establishing Technical Specifications for Fire Extinguishers". In addition, regarding frying oil fires, experiments were also carried out in accordance with the test method in accordance with the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". When extinguishing a fire, each fire extinguishing agent is filled in a 3L accumulator type fire extinguisher, and the fire extinguishing agent is sprayed on the fire extinguishing model from the spray nozzle installed in the fire extinguisher.

In terms of fire extinguishing performance, those who did not burn again within the specified time (2 minutes for class A fires, and 1 minute for class B fires and frying oil fires) were rated as "○"; those who were temporarily extinguished but caught fire again within the specified time were rated as "△"; In addition, the deterioration test is carried out in accordance with the "deterioration test" stipulated in the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". As a result, those with no change in appearance, pH, specific gravity, and freezing point temperature were rated as "○"; those with changes in one or more of appearance, pH, specific gravity, and freezing point temperature were rated as "×". These results are shown in Table 5 for Comparative Example 5-1, Comparative Example 5-2, and Example 5-1, Table 6 for Comparative Example 6-1, Comparative Example 6-2, and Example 6-1, Table 7 for Comparative Example 7-1, Comparative Example 7-2, and Example 7-1, and Table 8 for Comparative Example 8-1, Comparative Example 8-2, and Example 8-1.

As shown in Table 5 to Table 8, it can be seen that the fire extinguishing agent of this embodiment, even if the proportion of the natural surfactant in the total amount of 100 milliliters is reduced to 0.200 g, by making potassium acetate, potassium citrate, sodium acetate or sodium citrate contained in a ratio of 50 g and saponin in a ratio of 0.200 g, and making the ratio of the content of the alkali metal carboxylate salt to the natural surfactant in terms of mass ratio as alkali metal carboxylate:natural surfactant=250:1, It has a high fire extinguishing performance of "○" for Class A fire, Class B fire and frying oil fire. Also, since the result of the deterioration test was "◯", the quality retention was also excellent. Moreover, since potassium acetate is used as a food additive in EU countries, and potassium citrate, sodium acetate, sodium citrate and saponin are approved as food additives in Japan, the safety to the human body is also high.

[Example 9-1] Put 10 g of potassium acetate, 20 g of sodium acetate, and 0.150 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "alkali metal carboxylate:saponin" in this fire extinguishing agent is "200:1". In addition, the alkali metal carboxylate can be commercially available, but it can also be used. For example, mix 6.1 g of acetic acid with a purity of 100% and potassium carbonate with a purity of 99.5% and 7.0 g of potassium carbonate. After reacting at a temperature below 50°C, perform a purification step, take out 10 g of potassium acetate, and mix 14.6 g of acetic acid with a purity of 100% and 12.9 g of sodium carbonate with a purity of 99.5%. g. [Example 9-2] Put 5 g of potassium acetate, 20 g of sodium acetate, 5 g of potassium citrate, 25 g of sodium citrate, and 0.200 g of saponin into a container, add water to adjust to 100 ml, and stir to obtain a fire extinguishing agent. The mass ratio of "alkali metal carboxylate:saponin" in this fire extinguishing agent is "275:1". In addition, a commercially available carboxylic acid alkali metal salt can be used, but it can also be used. For example, 3.0 g of acetic acid with a purity of 100% and potassium carbonate with a purity of 99.5% are mixed. After reacting at a temperature below 50°C, a purification step is performed, and 5 g of potassium acetate is taken out. 2.9 g of citric acid with a purity of 100% and potassium carbonate with a purity of 99.5% are mixed. Mix 14.6 g of acetic acid with a purity of 100% and 12.9 g of sodium carbonate with a purity of 99.5%, and react at a temperature below 50°C, then perform a purification step, take out 20 g of sodium acetate, and mix 16.3 g of citric acid with a purity of 100% and 13.5 g of sodium carbonate with a purity of 99.5%, react at a temperature below 50°C, and perform a purification step to take out 25 g of sodium citrate.

[Compilation of Example 9-1 and Example 9-2] The pH was measured for each fire extinguishing agent of Example 9-1 and Example 9-2. In addition, regarding the fire extinguishing performance of Class A fires, Class B fires, and frying oil fires, the fire extinguishing experiments of the A-1 model and the B-1 model were carried out in accordance with the test method of the Japanese Ministry of Internal Affairs and Communications "Ministry Order for Establishing Technical Specifications for Fire Extinguishers". In addition, regarding frying oil fires, experiments were also carried out in accordance with the test method in accordance with the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". When extinguishing a fire, each fire extinguishing agent is filled in a 3L accumulator type fire extinguisher, and the fire extinguishing agent is sprayed on the fire extinguishing model from the spray nozzle installed in the fire extinguisher.

In terms of fire extinguishing performance, those who did not burn again within the specified time (2 minutes for class A fires, and 1 minute for class B fires and frying oil fires) were rated as "○"; those who were temporarily extinguished but caught fire again within the specified time were rated as "△"; In addition, the deterioration test is carried out in accordance with the "deterioration test" stipulated in the Japanese Ministry of Internal Affairs and Communications Order "Ministry Order Establishing Technical Specifications for Fire Extinguishers". As a result, those with no change in any of appearance, pH, and specific gravity were rated as "○"; those with changes in one or more of appearance, pH, and specific gravity were rated as "×". These results are shown in Table 9.

As shown in Table 9, it can be seen that the fire extinguishing agent of this embodiment, even if the ratio of the natural surfactant in the total amount of 100 ml is reduced to 0.200 g, by making the carboxylic acid alkali metal salt formed by 1 or 2 or more selected from potassium acetate, potassium citrate, sodium acetate or sodium citrate be contained in a ratio of 30 to 55 g, saponin is contained in a ratio of 0.150 to 0.200 g, and the ratio of the content of the carboxylate alkali metal salt to the natural surfactant is as follows: The mass ratio is calculated as alkali metal salt of carboxylic acid: natural surfactant = 200:1 to 275:1, and still has high fire extinguishing performance for Class A fires, Class B fires and frying oil fires, all of which are "○". Also, since the result of the deterioration test was "◯", the quality retention was also excellent. Moreover, since potassium acetate is used as a food additive in EU countries, and potassium citrate, sodium acetate, sodium citrate and saponin are approved as food additives in Japan, the safety to the human body is also high.

From the above, according to comparative example 1-1 to comparative example 8-2 and embodiment 1-1 to embodiment 9-2, to be selected from potassium acetate, potassium citrate, sodium acetate and sodium citrate 1 or more kinds of carboxylic acid alkali metal salt formed; be selected from lecithin, saponin and casein more than 1 or 2 kinds of natural surfactant and water formed, in the total amount of 100 milliliters, carboxylic acid alkali metal salt with 30 ~ 55g, natural surfactant with 0.1 0.07-0.200g, and the content ratio of alkali metal carboxylate and natural surfactant is calculated as alkali metal carboxylate:natural surfactant=150:1-275:1 in mass ratio, not only has high fire extinguishing performance and high safety to human body, but also is excellent in terms of cost due to the small amount of natural surfactant used.

In addition, the fire extinguishing agent of this embodiment preferably contains lower alcohols designated as food additives with a carbon number of 4 or less based on the mass ratio of natural surfactants: lower alcohols = 1:30 to 1:40 relative to natural surfactants. Thereby, high safety to the human body can be ensured, and the fire extinguishing performance can be improved at the same time.

Also, the fire extinguishing agent of this embodiment is preferably to have a pH of 5.5-8.5. Thereby, corrosion of a fire extinguisher etc. can be prevented.

Claims (3)

A fire extinguishing agent is characterized in that: it is composed of carboxylic acid alkali metal salt composed of 1 or 2 or more selected from potassium acetate, potassium citrate, sodium acetate and sodium citrate; 1 or 2 or more natural surfactants selected from lecithin, saponin and casein; water; and a lower alcohol designated as a food additive with a carbon number of 4 or less. The proportion of 0.107-0.200g is contained, the ratio of the content of the aforementioned alkali metal carboxylic acid salt to the aforementioned natural surfactant is the aforementioned alkali metal salt of carboxylic acid in terms of mass ratio: the aforementioned natural surfactant = 150:1-275:1, the ratio of the content of the aforementioned natural surfactant to the aforementioned lower alcohol is the aforementioned natural surfactant: the aforementioned lower alcohol = 1:30-1:40. The fire extinguishing agent according to claim 1, wherein the aforementioned alkali metal carboxylate is obtained by mixing either or both of acetic acid and citric acid with either or both of potassium carbonate and sodium carbonate and reacting them. Such as the fire extinguishing agent of claim 1 or claim 2, its pH is 5.5~8.5.