Foam extinguishing agent composition for firefighting training

Abstract

To provide a foam fire extinguishing chemical agent for fire drill that has an excellent initial foaming property and reduces foam after an elapse of a certain period of time.SOLUTION: A foam fire extinguishing chemical agent composition for fire drill is provided, including a nonionic surfactant (A) having a cyclic structure and an anionic surfactant (B). It is preferable that the cyclic structure is at least one selected from a 3- to 10-membered ring structure. It is preferable that the cyclic structure has an oxygen atom and / or a nitrogen atom.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a foam composition for use in firefighting training. [Background technology]

[0002] Foam extinguishing agents are primarily used to extinguish oil fires. When in use, they are diluted with water or other liquids to a certain concentration, and then foamed using a foaming nozzle or other device to create foam that covers the surface of the fire and extinguishes the fire through a cooling and suffocating effect. The foam discharged from the foam extinguishing system is difficult to extinguish under natural conditions, and there is also the problem that the agent used must be recovered from the perspective of environmental impact.

[0003] As an example of a foam extinguishing agent for firefighting training that contains environmentally friendly ingredients, Patent Document 1 gives an example of a synthetic surfactant foam for training that contains an amphoteric surfactant, while Patent Document 2 gives an example of a foam for fire extinguishing equipment testing that contains a hydrocarbon anionic surfactant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-5337 A [Patent Document 2] JP 2011-87792 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] However, the foaming agents of Patent Documents 1 and 2 have problems in that they have low initial foaming properties and take a long time to treat the released foam. An object of the present invention is to provide a foam extinguishing agent for use in firefighting training, which has excellent initial foaming properties and reduces foam after a certain period of time has passed. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above problems can be solved by a foam fire-extinguishing agent composition for use in fire training that contains a specific surfactant. That is, the foam extinguishing agent composition for use in firefighting training of the present invention contains a nonionic surfactant (A) having a cyclic structure and an anionic surfactant (B).

[0007] The cyclic structure is preferably at least one selected from 3- to 10-membered cyclic structures. It is preferred that the cyclic structure contains an oxygen atom and / or a nitrogen atom. It is preferred that the activator (B) is an alkali metal salt. It is preferable that the activator (B) has a nitrogen atom in the molecule. The content of the activator (B) is preferably 10 to 1500 parts by weight based on 100 parts by weight of the activator (A). Effect of the Invention

[0008] The foam extinguishing agent composition for use in firefighting training of the present invention has excellent initial foaming properties and reduces foaming after a certain period of time has passed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The foam extinguishing agent composition for fire training of the present invention essentially contains a nonionic surfactant (A) having a cyclic structure and an anionic surfactant (B). First, the components constituting the foam extinguishing agent composition for fire training will be described in detail.

[0010] [Nonionic surfactant having a cyclic structure (A)] The nonionic surfactant (A) having a cyclic structure (hereinafter sometimes simply referred to as the active agent (A)) is a compound having a cyclic structure in its molecule.

[0011] The cyclic structure of the activator (A) is not particularly limited, but is preferably at least one selected from 3- to 10-membered cyclic structures. If the cyclic structure of the activator (A) has a cyclic structure with more than 10 members, the foam reduction effect after a certain period of time may decrease. The cyclic structure of the activator (A) is more preferably at least one selected from 4- to 8-membered ring structures, even more preferably at least one selected from 5- to 7-membered ring structures, and particularly preferably at least one selected from 5- to 6-membered ring structures.

[0012] The cyclic structure of the activator (A) preferably contains an oxygen atom and / or a nitrogen atom, since this can improve the foam reduction effect after a certain period of time. The cyclic structure of the activator (A) more preferably contains an oxygen atom or a nitrogen atom, and even more preferably contains an oxygen atom. The cyclic structure of the activator (A) preferably contains carbon atoms, and more preferably contains carbon atoms and oxygen atoms and / or nitrogen atoms. The cyclic structure of the activator (A) may have a double bond in the structure. The number of cyclic structures contained in the activator (A) is not particularly limited, but is preferably 1 to 8, more preferably 1 to 6, and particularly preferably 1 to 4.

[0013] The activator (A) may have a hydrocarbon group in its molecule. Among them, although there is no particular limitation, a hydrocarbon group having 6 to 30 carbon atoms is preferred in terms of foam retention. The number of carbon atoms in the hydrocarbon group is more preferably 6 to 24, more preferably 6 to 22, even more preferably 7 to 18, and particularly preferably 8 to 16. When the activator (A) has a hydrocarbon group, the hydrocarbon group may be a linear and / or branched hydrocarbon group. The hydrocarbon group may be a saturated or unsaturated hydrocarbon group. In particular, the hydrocarbon group of the activator (A) is preferably a linear saturated hydrocarbon group and / or a branched saturated hydrocarbon group. When the activator (A) has a hydrocarbon group, the number of the hydrocarbon groups is not particularly limited, but is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 to 2.

[0014] The activator (A) may be an alkylene oxide adduct. The number of carbon atoms of the alkylene oxide is not particularly limited, but is preferably 2 to 3. The number of added alkylene oxides in the activator (A) is not particularly limited, but is preferably 5 to 100.

[0015] Examples of the activator (A) include polyoxyalkylene alkylphenyl ethers such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether; polyoxyalkylene styrenated phenyl ethers such as polyoxyethylene distyrenated phenyl ether and polyoxyethylene tristyrenated phenyl ether; polyoxyalkylene sorbitan fatty acid esters such as polyoxyethylene sorbitan laurate and polyoxyethylene sorbitan oleate; and alkyl glycosides such as 2-ethylhexyl glycoside, octyl glycoside, decyl glycoside, dodecyl glycoside, and tetradecyl glycoside. The activator (A) may be used alone or in combination of two or more. Among the activators (A), alkyl glucosides are preferred.

[0016] [Anionic surfactant (B)] The anionic surfactant (B) (hereinafter, sometimes simply referred to as activator (B)) contained in the foam extinguishing agent composition for firefighting training of the present invention may have a hydrocarbon group in its molecule. In particular, a hydrocarbon group having 1 to 30 carbon atoms is preferred in terms of foaming properties of the foam. The number of carbon atoms in the hydrocarbon group is not particularly limited, but is preferably 1 to 24, more preferably 1 to 22, even more preferably 1 to 20, and particularly preferably 1 to 18. When the activator (B) has a hydrocarbon group, the hydrocarbon group may be at least one type of hydrocarbon group selected from linear, branched, and cyclic groups. The hydrocarbon group may be a saturated or unsaturated hydrocarbon group. When the activator (B) has a hydrocarbon group, the number of the hydrocarbon groups is not particularly limited, but is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 to 2.

[0017] The activator (B) is not particularly limited, but it is preferable in terms of foam retention if it has a nitrogen atom in its molecule. When the activator (B) has a nitrogen atom in its molecule, the ratio of the total atomic weight of all nitrogen atoms in the activator (B) to the molecular weight of the activator (B) is not particularly limited, but is preferably 2.0 to 5.5% by weight. When the ratio of the total atomic weight of all nitrogen atoms in the activator (B) is 2.0% by weight or more, the foaming property and foam retention tend to be improved. On the other hand, when the ratio of the total atomic weight of all nitrogen atoms in the monomer (I-1) is 5.5% by weight or less, the foaming property and foam retention tend to be improved. The ratio of the total atomic weight of all nitrogen atoms in the activator (B) to the molecular weight of the activator (B) is more preferably 2.5 to 5.0% by weight.

[0018] The activator (B) is not particularly limited, but is preferably at least one selected from carboxylates, sulfonates, sulfates, and phosphates. Among them, sulfonates and sulfates are preferred, and sulfonates are more preferred. In addition, examples of the activator (B) include alkali metal salts such as sodium salts and potassium salts; ammonium salts, and the like, and alkali metal salts are preferred.

[0019] The activator (B) may be, for example, an amino acid type anionic surfactant. When the activator (B) is an amino acid type anionic surfactant, it is preferred in terms of initial foaming properties and environmental considerations. Examples of amino acid type anionic surfactants include taurine-based surfactants such as sodium caproyl methyl taurate, sodium cocoyl methyl taurate, potassium cocoyl methyl taurate, sodium lauroyl methyl taurate, potassium lauroyl methyl taurate, sodium stearoyl methyl taurate, and sodium oleyl methyl taurate; sarcosine-based surfactants such as sodium cocoyl sarcosine, potassium cocoyl sarcosine, sodium lauroyl sarcosine, sodium palmitoyl sarcosine, and sodium oleyl sarcosine; and alanine-based surfactants such as sodium cocoyl methyl alanine, sodium lauroyl methyl alanine, and triethanolamine lauroyl methyl alanine. These surfactants (B) may be used alone or in combination of two or more. Among the above-mentioned surfactants (B), taurine-based surfactants are preferred.

[0020] The content of the activator (B) in the foam extinguishing agent composition for firefighting training is not particularly limited, but is preferably 10 to 1500 parts by weight relative to 100 parts by weight of the activator (A). If the content of the activator (B) is less than 10 parts by weight, the amount of foam reduction after a certain period of time may be small. On the other hand, if the content of the activator (B) is more than 1500 parts by weight, the initial foaming property may be reduced. The content of the activator (B) is more preferably 20 to 1200 parts by weight, further preferably 30 to 800 parts by weight, and particularly preferably 40 to 400 parts by weight.

[0021] The foam extinguishing agent composition for firefighting training of the present invention may contain a surfactant (C) (hereinafter, sometimes simply referred to as activator (C)) other than the above-mentioned activator (A) and activator (B). As the activator (C), a nonionic surfactant having no cyclic structure is preferable.

[0022] The activator (C) may have a hydrocarbon group. When the activator (C) has a hydrocarbon group, the number of carbon atoms in the hydrocarbon group is not particularly limited, but is preferably 6 to 24, more preferably 7 to 22, and further preferably 8 to 18. In addition, when the activator (C) has a hydrocarbon group, the hydrocarbon group may be a linear and / or branched hydrocarbon group. In addition, the hydrocarbon group may be a saturated hydrocarbon group or an unsaturated hydrocarbon group. In particular, the hydrocarbon group of the activator (C) is preferably a linear saturated hydrocarbon group and / or a branched saturated hydrocarbon group. When the activator (C) has a hydrocarbon group, the number of the hydrocarbon groups is not particularly limited, but is preferably 1 to 4, more preferably 1 to 3, and further preferably 1 to 2.

[0023] The activator (C) may be an alkylene oxide adduct. The number of carbon atoms of the alkylene oxide is not particularly limited, but is preferably 2 to 3. The number of added alkylene oxides in the activator (C) is not particularly limited, but is preferably 5 to 20.

[0024] The activator (C) is preferably an ether type surfactant. Examples of the ether type surfactant include polyoxyalkylene alkyl ethers such as polyoxyethylene SEC-alkyl (C12-14) ether and polyoxyethylene oleyl ether; polyoxyalkylene castor oil ethers such as polyoxyethylene hydrogenated castor oil ether; and the like. One or more of these may be used in combination.

[0025] The content of activator (C) in the foam fire extinguishing agent composition for fire training is not particularly limited, but is preferably 100 parts by weight or less, more preferably 50 parts by weight or less, even more preferably 40 parts by weight or less, and particularly preferably 30 parts by weight or less, per 100 parts by weight of activator (A).

[0026] At least one selected from the above-mentioned active agent (A), active agent (B) and active agent (C) may be selected from surfactants listed in the Standards for Quasi-Drug Raw Materials from the viewpoint of consideration for users and the environment, or may be a surfactant other than those listed.

[0027] 〔water〕 The foam extinguishing composition for firefighting training of the present invention may contain water. It is preferable in terms of workability if the foam extinguishing composition for firefighting training contains water. Examples of water include tap water, ion-exchanged water, distilled water, etc. The water content in the foam fire extinguishing agent composition for firefighting training is not particularly limited, but is preferably 500 to 100,000 parts by weight, more preferably 1,000 to 80,000 parts by weight, even more preferably 2,000 to 60,000 parts by weight, and particularly preferably 3,000 to 60,000 parts by weight, per 100 parts by weight of the activator (A).

[0028] [Other ingredients] The training foam fire extinguishing agent composition of the present invention may contain other components other than the above components, so long as the effects of the present invention are not impaired. Examples of other components include pH adjusters such as sulfuric acid, hydrochloric acid, acetic acid, lactic acid, citric acid, sodium hydroxide, potassium hydroxide, alkanolamines, and sodium carbonate; preservatives such as methylparaben, ethylparaben, benzoates, and phenoxyethanol; inorganic salts such as sodium chloride and sodium sulfate; water-soluble organic solvents such as methanol, ethanol, isopropanol, ethylene glycol, and propylene glycol; fragrances; and colorants.

[0029] [Training foam fire extinguishing agent composition and its manufacturing method] The foam extinguishing agent composition for firefighting training of the present invention essentially contains activator (A) and activator (B). By essentially containing activator (A) and activator (B), it is possible to control the film thickness of the generated foam while having high foaming properties, and therefore it is considered that the foam has excellent initial foaming properties, and while maintaining the foam for an appropriate time considered necessary for fire extinguishing, the foam can be reduced after a certain time has passed. This also improves the work efficiency during firefighting training. The foam extinguishing agent composition for fire training of the present invention is used during fire training, and may or may not have a fire extinguishing effect. The foam extinguishing agent composition for fire training may be incorporated into a fire extinguishing system for use. The foam extinguishing agent composition for fire training can also be used during testing or inspection of the fire extinguishing system.

[0030] The non-volatile content of the foam extinguishing composition for fire training of the present invention is not particularly limited, but is preferably 0.05 to 50% by weight, more preferably 0.1 to 25% by weight, even more preferably 0.5 to 10% by weight, and particularly preferably 0.5 to 5% by weight. The "non-volatile content of the foam extinguishing composition for fire training" of the present invention is the residue when the foam extinguishing composition for fire training is heated at 110°C and the weight becomes constant.

[0031] The viscosity of the foam extinguishing agent composition for fire training of the present invention at 25° C. when the non-volatile content is 3% by weight is not particularly limited, but from the viewpoint of handleability, it is preferably 1 to 1000 mPa s, and more preferably 1 to 100 mPa s. The method for measuring the viscosity of the foam extinguishing agent composition for fire training of the present invention at 25° C. when the non-volatile content is 3% by weight is the method described in the Examples.

[0032] The pH of the foam extinguishing agent composition for fire training of the present invention at 25°C when the non-volatile content is 3% by weight is not particularly limited, but is preferably 5 to 11. When the foam extinguishing agent composition for fire training has a pH of 5 or more at 25°C when the non-volatile content is 3% by weight, the initial foaming property tends to be improved. On the other hand, when the pH is 11 or less, the foam reduction property after a certain period of time tends to be improved. The pH of the foam extinguishing agent composition for fire training at 25°C when the non-volatile content is 3% by weight is more preferably 6 to 10, even more preferably 6.5 to 9.5, and particularly preferably 7 to 9.5. The method for measuring the pH of the foam extinguishing agent composition for fire training at 25°C when the non-volatile content is 3% by weight is the method used in the examples.

[0033] The method for producing the foam extinguishing agent composition for firefighting training of the present invention is not particularly limited, but may include a method of mixing activator (A) and activator (B), and optionally activator (C), water, and other components. The mixing is not particularly limited, but may be performed using an apparatus equipped with a very simple mechanism such as a container and agitating blades. EXAMPLES

[0034] Examples and Comparative Examples of the foam extinguishing agent composition for firefighting training of the present invention will be specifically described below, however, the present invention is not limited to these Examples.

[0035] [Evaluation of initial foaming, foam retention and foam reduction] The initial foaming ability of the training foam extinguishing agent composition was measured from the foaming power according to the method specified in JIS K3362 at a measurement temperature of 25°C. The foam height was measured 5 minutes and 60 minutes after dripping, and the foam retention and foam reduction were calculated according to the following formula (1). The initial foaming ability, foam retention and foam reduction of the obtained training foam extinguishing agent composition were judged according to the following criteria. Foam retention or foam reduction (%) = [1-(foam height after a specified time / foaming power)] x 100 Formula (1)

[0036] <Initial foaming> A foaming power (foam height, initial foaming power) of 200 mm or more immediately after dropping was judged to be good foaming power and marked with "○", whereas a foaming power below this was judged to be poor foaming power and marked with "×". <Foam retention> If the foam reduction rate 5 minutes after dropping was 10% or less, the retention was judged to be good and rated as "◯", and if it was more than that, the retention was judged to be poor and rated as "×". <Foam reduction> A foam reduction rate of 25% or more 60 minutes after dropping was judged to be good and marked with "O", whereas a foam reduction rate of less than this was judged to be poor and marked with "X".

[0037] [Measurement of Viscosity] An aqueous solution of the foam extinguishing agent composition for firefighting training with a non-volatile content of 3% by weight was left to stand in a thermostatic chamber at 25°C for 24 hours, and then the viscosity was measured using a viscometer (manufactured by Toki Sangyo Co., Ltd., model number: TVB-10).

[0038] [pH Measurement] An aqueous solution of the foam fire extinguishing agent composition for fire training with a non-volatile content of 3% by weight was left to stand in a thermostatic chamber at 25°C for 24 hours, and then the pH of the aqueous solution at 25°C was measured using a pH meter (manufactured by Horiba, Ltd., model number: F-71).

[0039] [Examples and Comparative Examples] Each of the components shown in Tables 1 to 3 was mixed and thoroughly stirred with a glass rod to obtain a foam extinguishing composition for firefighting training. The obtained foam extinguishing composition for training was evaluated by the above-mentioned evaluation method. Among the components listed in Tables 1 to 3, the following components A-1 to C-2 were used. A-1 Decyl glycoside A-2 Dodecyl glycoside A-3 Polyoxyethylene (20) sorbitan monooleate B-1 Sodium methyl cocoyl taurate B-2 Sodium caproyl methyl taurate C-1 Polyoxyethylene (5) SEC-Alkyl (12-14) Ether C-2 Polyoxyethylene (40) hydrogenated castor oil ether

[0040] [Table 1]

[0041] [Table 2]

[0042] [Table 3]

[0043] As shown in Tables 1 to 3, the foam extinguishing agent composition for fire training containing a nonionic surfactant (A) having a cyclic structure and an anionic surfactant (B) has excellent initial foaming properties and reduces foam after a certain period of time. On the other hand, the foam extinguishing agent composition not containing the nonionic surfactant (A) having a cyclic structure (Comparative Examples 1 to 4) and not containing the anionic surfactant (B) (Comparative Examples 5 to 7) do not solve the problem of the present application.

Claims

1. The composition contains a nonionic surfactant (A) having a cyclic structure and an anionic surfactant (B), A foam fire-extinguishing agent composition for firefighting training, wherein the cyclic structure has an oxygen atom and / or a nitrogen atom.

2. The foam extinguishing agent composition for firefighting training according to claim 1, wherein the cyclic structure is at least one selected from 3- to 10-membered cyclic structures.

3. 3. The foam extinguishing agent composition for firefighting training according to claim 1 or 2, wherein the activator (B) is an alkali metal salt.

4. The foam extinguishing agent composition for firefighting training according to any one of claims 1 to 3, wherein the activator (B) has a nitrogen atom in its molecule.

5. The foam extinguishing agent composition for firefighting training according to any one of claims 1 to 4, wherein the content of the activator (B) is 10 to 1500 parts by weight per 100 parts by weight of the activator (A).

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