JP7085353B2 - Defoaming agent for foam fire extinguishing agent - Google Patents

Description

The present invention relates to a defoaming agent for a foam fire extinguishing agent.

Foam fire extinguishing equipment is regularly inspected for release. In this inspection, it is necessary to confirm the state of the released bubbles, so it is obligatory to actually release and inspect the bubbles.

The fire extinguishing foam released by the foam fire extinguishing equipment has a problem that it is difficult to extinguish the foam in a natural state, it takes a long time to recover the foam, and it is very inefficient.

Therefore, a technique for defoaming using an oil-based or silicone-based liquid or a defoaming agent containing a defoaming powder when the fire extinguishing agent is released by the foam fire extinguishing equipment during periodic inspections (patented). Document 1), foam fire extinguishing equipment with special cleaning equipment (Patent Document 2), inspection method of foam fire extinguishing equipment including defoaming step of defoaming with a defoaming agent containing a polymer absorbent (Patent Document 3), etc. there were.
However, the powder defoaming agent of Patent Document 1 has a small foam diameter in a low-foaming fire extinguishing foam having a magnification of 20 times or less, and has a dense molecular structure of hydrophobic groups and hydrophilic groups that stabilize the foam film. Therefore, the defoaming agent does not easily penetrate the foam film, and the defoaming effect is not sufficient. The foam fire extinguishing equipment of Patent Document 2 is special, and the inspection method of Patent Document 3 requires a large foam extinguishing sheet for implementation, so that it is not easy to recover the foam fire extinguishing agent.

Japanese Unexamined Patent Publication No. 61-97009 Japanese Unexamined Patent Publication No. 10-263102 Japanese Unexamined Patent Publication No. 2011-92614

An object of the present invention is to provide a foam extinguishing agent for foam fire extinguishing agent, which can quickly extinguish foam even with a strong foam fire extinguishing agent by spraying or mixing, and facilitates foam recovery.

As a result of diligent studies, the present inventors have made a foam fire extinguishing agent containing a specific amount of a specific defoaming component and at least one selected from a specific anionic surfactant, a nonionic surfactant, and a cationic surfactant. It has been found that a defoaming agent can solve the above-mentioned problems.

That is, the defoaming agent for a foam fire extinguishing agent of the present invention is at least selected from a defoaming component (A), an anionic surfactant (B), a nonionic surfactant (D), and a cationic surfactant (E). A defoaming agent for a foam fire extinguishing agent containing one type, wherein the component (A) contains at least one type selected from an inorganic powder (A1), a silicone component (A2) and a metal soap (A3).
The anionic surfactant (B) is at least one selected from a sulfonic acid type anionic surfactant (B1), a sulfate ester type anionic surfactant (B2), and a phosphate ester type anionic surfactant (B3). Including
The nonionic surfactant (D) contains at least one selected from the polyoxyalkylene alkyl ether (D1), the polyoxyalkylene alkyl phenyl ether (D2) and the like.
The cationic surfactant (E) contains a quaternary ammonium salt type cationic surfactant (E1).
The weight ratio of the defoaming component (A) to the non-volatile content of the defoaming agent is 1 to 70% by weight.

It is preferable that the anionic surfactant (B) contains a sulfonic acid type anionic surfactant (B1).
It is preferable that the sulfonic acid type anionic surfactant (B1) contains a dialkylsulfosuccinate.

It is preferable that the nonionic surfactant (D) contains a polyoxyalkylene alkyl ether (D1).
It is preferable that the polyoxyalkylene alkyl ether (D1) contains a polyoxyethylene alkyl ether.

It is preferable that the quaternary ammonium salt-type cationic surfactant (E1) contains an alkyldimethylbenzylammonium chloride.

The weight ratio of at least one selected from the component (B), the component (D), and the component (E) to the non-volatile content of the foam extinguishing agent is preferably 30 to 99% by weight.

The pH of the foam extinguishing agent for foam fire extinguishing agents of the present invention is preferably 4 or more or 9 or less.

It is preferable that the foam extinguishing agent for foam fire extinguishing agent of the present invention is for a fluorine-based foam fire extinguishing agent or a protein-based fire extinguishing agent.

The defoaming agent for a foam fire extinguishing agent of the present invention can quickly extinguish a strong foam fire extinguishing agent by spraying or mixing, and the foam can be easily recovered.

Hereinafter, each component of a defoaming agent for a foam fire extinguishing agent (hereinafter, may be simply referred to as a defoaming agent) will be described.
[Defoaming component (A)]
The defoaming component (A) is indispensably contained in a defoaming agent for a foam fire extinguishing agent, and literally plays a role of extinguishing bubbles. The defoaming component (A) may be solid or liquid at 25 ° C.
The defoaming component (A) contains at least one selected from the inorganic powder (A1), the silicone component (A2) and the metal soap (A3). It is preferable that the defoaming component (A) contains the inorganic powder (A1) indispensably from the viewpoint of the defoaming effect.

The inorganic powder (A1) is not particularly limited as long as it is a finely crushed fine particle substance, but is not particularly limited, but silicon dioxide (silica), titanium dioxide, aluminum oxide, fumed TiO ₂ , zinc oxide, magnesium oxide. , Calcium carbonate, magnesium carbonate and mixtures thereof, etc., may be used alone or in combination of two or more. More preferably, fine powder silica is mentioned.
The surface area of the fine powder silica by the BET method is preferably 50 m ² / g or more, more preferably 100 m ² / g or more, still more preferably 200 m ² / g or more.
The fine powder silica can be produced by a known method, for example, a thermal decomposition method of silicon halide, a decomposition precipitation method of a silicate metal salt, for example, sodium silicate, a gel forming method, or the like.
Preferred silica for use in the defoaming component (A) includes fumed silica, precipitated silica, gel-forming silica and the like.

The average particle size of these inorganic powders (A1) is not particularly limited, but is preferably 0.1 to 100 μm, more preferably 0.5 to 50 μm, and even more preferably 1 to 30 μm.

The silicone component (A2) is a general term for organopolysiloxanes, and means one containing silicone oil, silicone rubber, silicone resin, and the like. The silicone component is a component containing these silicones.
Examples of the organopolysiloxanes include dialkylpolysiloxanes such as dimethylpolysiloxane, diethylpolysiloxane, methylisopropylpolysiloxane, and methyldodecylpolysiloxane; methylphenylpolysiloxane, dimethylsiloxane / methylphenylsiloxane copolymer, dimethylsiloxane, and the like. Alkylphenylpolysiloxane such as diphenylsiloxane copolymer; alkylaralkylpolysiloxane such as methyl (phenylethyl) polysiloxane and methyl (phenylpropyl) polysiloxane; 3,3,3-trifluoropropylmethylpolysiloxane and the like. Can be done. These organopolysiloxanes may be used alone or in combination of two or more.

As the silicone component, silicone oil or the like having a linear molecular structure, a low degree of polymerization and fluidity at room temperature is preferable from the viewpoint of easily diffusing into bubbles. The viscosity is not particularly limited, but the viscosity at 25 ° C. is preferably 1 to 5 million mPa · s, more preferably 5 to 500,000 mPa · s in terms of the balance between defoaming property and permeability. be. In the present invention, the viscosity means what is measured by a cone plate type viscometer.

The metal soap (A3) may be any non-alkali metal salt of an organic acid having 8 to 20 carbon atoms, and may contain one kind or two or more kinds.

The organic acids constituting the metal soap are not particularly limited, but capric acid, pelargonic acid, capric acid, undecic acid, lauric acid, 5-dodecenoic acid, tridecic acid, myristic acid, 7-tetradecenoic acid, pentadecic acid, It may be one selected from palmitic acid, palmitreic acid, sapienoic acid, margaric acid, stealic acid, paxenoic acid, oleic acid, lysynolic acid, nonadesilic acid, arachidic acid, and paulic acid, and may contain two or more thereof.

The non-alkali metal salt of the metal soap is not particularly limited, but Al, Ag, Ba, Ca, Ce, Cd, Co, Cr, Cu, Fe, Hg, Li, Mg, Mn, Ni, Pb, Sn, Any one selected from Th, Ti, and Zn may be used, and two or more thereof may be included.

The secondary average particle size of the metal soap is not particularly limited, but is preferably 0.1 to 200 μm, more preferably 0.5 to 100 μm, and further preferably 1.0 in consideration of defoaming property and the like. It is ~ 50 μm, particularly preferably 1.5 to 40 μm, and most preferably 2.0 to 30 μm.

In the present invention, the mechanism for extinguishing the strong foam of the foam fire extinguishing agent is different from that of the conventional antifoaming agent, in that the defoaming component is positively adsorbed on the layer forming the foam and after the foam is broken. Is to continuously defoam while re-adsorbing to the bubbles in the lower layer.
At least one selected from the anionic surfactant (B), the nonionic surfactant (D), and the cationic surfactant (E) plays a role of promoting the adsorption of the defoaming component.

[Anionic surfactant (B)]
The anionic surfactant (B) is at least one selected from a sulfonic acid type anionic surfactant (B1), a sulfate ester type anionic surfactant (B2), and a phosphate ester type anionic surfactant (B3). At least one selected from the sulfonic acid type anionic surfactant (B1) and the phosphate ester type anionic surfactant (B3) is preferable from the viewpoint of excellent penetration into the foam fire extinguishing agent and defoaming.
Further, it is more preferable to contain the sulfonic acid type anionic surfactant (B1) from the viewpoint of excellent compatibility with the defoaming component (A) and excellent penetration into the foam fire extinguishing agent and defoaming.

Examples of the sulfonic acid type anionic surfactant (B1) include alkylbenzene sulfonates such as linear sodium dodecylbenzenesulfonate and branched sodium dodecylbenzenesulfonate; sodium α-tetradecenesulfonate and sodium α-hexadecenesulfonate. Α-olefin sulfonates such as potassium α-hexadecene sulfonate; alkane sulfonates such as sodium dodecyl sulfonate, sodium tetradecyl sulfonate; methyl sodium α-sulfolaurate, methoxyhexaethylene glycol-α-sulfolaurin Α-Sulfonic acid ester salts such as methyl sodium acid acid; acyl isethionates such as sodium cocoyl isomerate and ammonium cocoyl acetylate; N-acyl-N-methyl taurate such as sodium cocoyl methyl taurine; sodium dioctyl sulfosuccinate. Dialkyl sulfosuccinates such as; alkylnaphthalene sulfonates such as sodium propylnaphthalene sulfonate and the like can be mentioned. As the sulfonic acid type anionic surfactant, alkylbenzene sulfonates, α-olefin sulfonates, alkane sulfonates, dialkyl sulfosuccinates and the like are preferable, and dialkyl sulfosuccinates and the like are more preferable. These sulfonic acid type anionic surfactants may be used alone or in combination of two or more.

Examples of the sulfate ester type anionic surfactant (B2) include alkyl sulfates such as sodium dodecyl sulfate, potassium dodecyl sulfate, triethanolamine dodecyl sulfate, sodium stearyl sulfate, and sodium oleyl sulfate; polyoxyethylene (3) dodecyl. Polyoxyethylene alkyl AEL sulfate ester salts such as sodium sulfate, polyoxyethylene (3) cetyl sulfate ester, polyoxyethylene (3) cetyl sulfate ester triethanolamine; sulfated oils such as funnel oil; sulfated oleic acid Examples thereof include sulfated fatty acid ester salts such as butyl. In the above, the polyoxyethylene (3) means a polyoxyethylene group having 3 repeating units of the oxyethylene group. As the sulfate ester type anionic surfactant, an alkyl sulfate ester salt, a polyoxyethylene alkyl ether sulfate ester salt, a sulfated fatty acid ester salt and the like are preferable, and an alkyl sulfate ester salt, a polyoxyethylene alkyl AEL sulfate ester salt and the like are more preferable. .. These sulfate ester-type anionic surfactants may be used alone or in combination of two or more.

Examples of the phosphate ester type anionic surfactant (B3) include alkyl phosphates such as sodium dodecyl phosphate, potassium dodecyl phosphate, sodium stearyl phosphate, potassium stearyl phosphate, and the like: polyoxyethylene (3) lauryl ether phosphorus. Polyoxyethylene alkyl ether phosphate esters such as sodium acid, polyoxyethylene (3) potassium lauryl ether phosphate: polyoxyethylene (3) sodium laurylphenyl ether phosphate, polyoxyethylene (3) laurylphenyl ether phosphate Examples thereof include polyoxyethylene alkyl phenyl ether phosphate such as potassium. As the phosphoric acid ester type anionic surfactant, an alkyl phosphate ester salt, a polyoxyethylene alkyl ether phosphoric acid ester salt and the like are preferable, and an alkyl phosphate ester salt is more preferable. These phosphoric acid ester type anionic surfactants may be used alone or in combination of two or more.

[Nonion Surfactant (D)]
The nonionic surfactant (D) is at least one selected from the polyoxyalkylene alkyl ether (D1) and the polyoxyalkylene alkyl phenyl ether (D2), and is excellent in permeation into the foam fire extinguishing agent and foam extinguishing. , Polyoxyalkylene alkyl ether (D1) is preferably contained.

Examples of the polyoxyalkylene alkyl ether (D1) include polyoxyethylene (7) lauryl ether, polyoxyethylene (10) lauryl ether, polyoxyethylene (15) cetyl ether, and polyoxyethylene (9) SEC-alkyl (9) SEC-alkyl. Examples thereof include polyoxyethylene alkyl ethers such as C12 alkyl to C15 alkyl) ethers, polyoxyethylene (12) oleyl ethers, polyoxyethylene (20) polyoxypropylene (8) cetyl ethers.
These polyoxyalkylene alkyl ethers may be used alone or in combination of two or more.

Examples of the polyoxyalkylene alkyl phenyl ether (D2) include polyoxyethylene alkyl phenyl ethers such as polyoxyethylene (10) nonylphenyl ether and polyoxyethylene (24) styrylphenyl ether.
These polyoxyalkylene alkyl phenyl ethers may be used alone or in combination of two or more.

[Cationic surfactant (E)]
The cationic surfactant (E) contains a quaternary ammonium salt-type cationic surfactant (E1).

Examples of the quaternary ammonium salt-type cationic surfactant (E1) include lauryltrimethylammonium chloride and alkyldimethylbenzylammonium chloride.
These quaternary ammonium salt-type cationic surfactants may be used alone or in combination of two or more.
Further, from the viewpoint of excellent penetration into the foam fire extinguishing agent and foam extinguishing, it is preferable that the quaternary ammonium salt-type cationic surfactant contains alkyldimethylbenzylammonium chloride.

〔water〕
The defoaming agent of the present invention has a sufficient defoaming effect even at a low concentration, and is preferably diluted with water from the viewpoint of workability and economy, and may be diluted with water in advance. Examples of water include ion-exchanged water, distilled water, ultrapure water, industrial water, tap water, seawater and the like.

(Other ingredients)
The defoaming agent for a foam fire extinguishing agent of the present invention has the nonionic surfactant (D1) as other components from the viewpoint of improving the compatibility stability of the preservative, the pH adjusting agent, the viscosity adjusting agent, and the defoaming component. And may contain a nonionic surfactant or the like other than (D2).
Examples of the pH adjuster include acids such as sulfuric acid, hydrochloric acid, acetic acid, lactic acid and citric acid, and alkalis such as sodium hydroxide, potassium hydroxide, alkanolamines and sodium carbonate.
Examples of the viscosity adjusting agent include alcohols such as methanol and isopropanol, polyhydric alcohols such as ethylene glycol and propylene glycol, amphoteric surfactants, electrolytes, and water-soluble polymers.
Examples of the nonionic surfactant other than the nonionic surfactant (D1) and (D2) include glycerin monolaurate, glycerin sesquilaurate, glycerin dilaurate, glycerin trilaurate, glycerin monostearate, and glycerin sesquistearate. , Glycerin distearate, glycerin tristearate, glycerin monooleate, glycerin sesquioleate, glycerin dioleate, glycerin trioleate, etc. Glycerin alkylate: polyethylene glycol monolaurate, polyethylene glycol stearate, polyethylene glycol oleate Polyethylene glycol alkylate such as: sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan dioleate, sorbitan trioleate and other sorbitan fatty acid esters: polyoxyethylene castor oil, polyoxyethylene curing. Glycerol oil and the like can be mentioned.

[Foam extinguishing agent for foam fire extinguishing agent]
The weight ratio of the defoaming component (A) to the non-volatile content of the defoaming agent for foam fire extinguishing agents is 1 to 70% by weight, preferably 2 to 30% by weight, more preferably 3 to 25% by weight, and 4 to 20%. % By weight is more preferred. If it is less than 1% by weight, the defoaming property is insufficient, and if it exceeds 70% by weight, the permeability is lowered and the defoaming cannot be performed quickly.
Here, the non-volatile component refers to an absolute dry component when the foam extinguishing agent for foam extinguishing agent is heat-treated at 105 ° C. to remove the solvent and the like and reaches a constant amount.

The weight ratio of at least one selected from the anionic surfactant (B), the nonionic surfactant (D), and the cationic surfactant (E) to the non-volatile content of the foam extinguishing agent is 30 to 99 weight. % Is preferable, 35 to 98% by weight is preferable, 40 to 90% by weight is more preferable, 50 to 85% by weight is particularly preferable, and 60 to 80% by weight is most preferable. If it is less than 30% by weight, defoaming may not be performed quickly due to a decrease in permeability, and if it exceeds 99% by weight, defoaming property may be insufficient.

When the defoaming agent for foam fire extinguishing agent contains water, the weight ratio of water to the foam extinguishing agent for foam extinguishing agent is preferably 5 to 95% by weight, preferably 5 to 80% by weight, and 10 to 60% by weight. % Is more preferable, 15 to 40% by weight is particularly preferable, and 20 to 30% by weight is most preferable. If it is less than 5% by weight, the permeability of the foam fire extinguishing agent to the foam may be deteriorated, and if it exceeds 95% by weight, the foam extinguishing property may be deteriorated.

When the foam defoaming agent for foam extinguishing agent contains other components, the weight ratio of the other components to the foam extinguishing agent for foam extinguishing agent is preferably 5 to 50% by weight, more preferably 10 to 25% by weight. .. If it is less than 5% by weight, the permeability of the foam fire extinguishing agent to the foam may be deteriorated, and if it exceeds 50% by weight, the foam extinguishing property may be deteriorated.

The foam extinguishing agent for foam fire extinguishing agent of the present invention is suitable for a fluorine-based foam fire extinguishing agent or a protein-based foam fire extinguishing agent.
In the case of a fluorine-based foam fire extinguishing agent, the pH of the foam extinguishing agent for foam extinguishing agent is preferably 4 to 10 and more preferably 5 to 9 because the burden on the environment is small when the anionic surfactant (B) is contained. , 6-8 are particularly preferable.
The pH measurement conditions were measured with the concentration of the non-volatile component set to 1% by weight.

On the other hand, when the pH of the defoaming agent for foam fire extinguishing agent is 4 or less, or pH 9 or more, the effect of the present application can be further exhibited, which is preferable.
When the foam extinguishing agent contains an anionic surfactant (B), the pH of the foam extinguishing agent is preferably 4 or less or 9 or more, more preferably pH 3 or less or 10 or more, and further preferably 11. That is all.
When the nonionic surfactant (D) is contained in the foam extinguishing agent, the pH of the foam extinguishing agent is preferably 9 or more, more preferably 10 or more, still more preferably 11 or more, and particularly preferably 12. With the above, a quicker defoaming effect is exhibited.
When the foam extinguishing agent contains a cationic surfactant (E), the pH of the foam extinguishing agent is 4 or less or 9 or more, preferably 3 or less or 10 or more, more preferably 11 or more, and further. Preferably, the pH is 12 or higher, and a more rapid defoaming effect is exhibited.
The pH measurement conditions are the same as described above, in which the concentration of the non-volatile component is set to 1% by weight.

In the case of a protein-based foam fire extinguishing agent, the pH of the foam extinguishing agent is preferably 4 to 10, more preferably 5 to 9, and even more preferably 6 to 8 from the viewpoint of environmental load.
On the other hand, when the pH of the defoaming agent for foam fire extinguishing agent is 4 or less, or pH 9 or more, the effect of the present application can be further exhibited, which is preferable.
The pH measurement conditions were measured with the concentration of the non-volatile component set to 1% by weight, similar to the above-mentioned fluorine-based foam fire extinguishing agent.

The viscosity of the foam extinguishing agent for foam fire extinguishing agents at 25 ° C. is preferably 100,000 mPa · s or less, more preferably 10,000 mPa · s or less, further preferably 1000 mPa · s or less, and particularly preferably 100 mPa · s or less. The preferred lower limit is 5 mPa · s.

The defoaming agent for foam fire extinguishing agents actively adsorbs the defoaming component to the layer forming the foam, and after the foam breaks, it re-adsorbs to the foam in the lower layer and continuously extinguishes the foam. When the foam defoaming agent contains an amphoteric surfactant and an aqueous solution of a water-soluble polymer, it is preferable to efficiently recover the foam that is difficult to extinguish in the natural state released in the foam release test.

[Manufacturing method of defoaming agent for foam fire extinguishing agent]
As a method for producing a foam extinguishing agent for a foam fire extinguishing agent, a conventionally known method can be mentioned. For example, at least one selected from an anionic surfactant component (B), a nonionic surfactant (D), and a cationic surfactant (E) is blended with the defoaming component (A), and water is added thereto to make it uniform. It is prepared by.
As a method for adjusting the pH of the foam extinguishing agent, for example, the pH is adjusted after adjusting the pH to a concentration at which the foam extinguishing agent is sprayed. Alternatively, conventionally known methods such as adjusting the pH of the concentrated solution before adjusting the spray concentration of the foam extinguishing agent for foam fire extinguishing agent can be mentioned.

[How to extinguish foam fire extinguishing agent]
When the above-mentioned foam extinguishing agent for foam fire extinguishing agent is sprayed on the foam fire extinguishing agent, it is preferable to dilute it with water and dilute it to a concentration of 1 to 15% by weight of the entire non-volatile content from the viewpoint of handleability. 2 to 10% by weight is more preferable, and 3 to 6% by weight is further preferable.
As a method of spraying the foam extinguishing agent for foam fire extinguishing agent on the foam fire extinguishing agent, a known method can be adopted.

Examples and comparative examples are shown below. The present invention is not limited to these examples.
In addition, Examples 109-118, 124, 125, 156-161, 168, and 169 are used as reference examples.

Each component shown in Tables 1 to 14 was mixed, stirred well with a glass rod, and water was added to prepare an aqueous solution so that the non-volatile content was 6% by weight. The viscosity of the formulation before adding water was 90 mPa · s in Example 1 and 500 mPa · s in Example 2.
Further, in Examples 109 to 135 and Comparative Examples 14 to 25, the pH of the prepared defoaming agent was adjusted to the values shown in Tables 4 to 5 and 7 to 8. When the pH was 4 or less, lactic acid was used, and when the pH was 9 or more, sodium carbonate was used.
For Examples 1 to 135 and Comparative Examples 1 to 25, a fluorofoam fire extinguishing agent (Megafoam (registered trademark) AGF-3T, manufactured by DIC Co., Ltd.) was foamed 20 times with a mixer, and 500 mL of foam was placed in a 500 mL beaker. After that, 15 mL of a 6% aqueous solution of antifoaming agent was sprayed over 30 seconds.
For Examples 136 to 177 and Comparative Examples 26 to 43, a protein-based foam fire extinguishing agent (manufactured by Yamato Protec) was foamed 10 times with a mixer, 300 mL of foam was placed in a 300 mL beaker, and then a 6% aqueous defoaming agent was used. 15 mL was sprayed over 30 seconds.
Those in which the liquid level was visible after 60 minutes and the bubbles almost disappeared were regarded as acceptable.
Those with residual bubbles after 60 minutes were rejected.
Tables 1 to 8 show the results of the fluorine-based foam fire extinguishing agent, and Tables 9 to 14 show the results of the protein-based foam fire extinguishing agent.
Further, among the descriptions in Tables 1 to 14, the following components were used as the components related to A1 to E1.
A1 Silicon dioxide (particle size: 10 μm, BET specific surface area: 250 m ² / g)
A2 dimethyl silicone (viscosity: 10,000 mPa · s)
A3 Magnesium stearate (particle size: 10 μm)
B1-1 Sodium dioctyl sulfosuccinate B1-2 Sodium dodecylbenzene sulfonate B2-1 Sodium stearyl sulfate B2-2 Polyoxyethylene (2) Dodecyl ether sulfate B3-1 Potassium dodecyl phosphate B3-2 Polyoxyethylene (3) Dodecyllin Potassium Acid C1 Ethylene Glycol C2 Propylene Glycol C3 Isopropanol D1 Polyoxyethylene (9) Lauryl Ether D2 Polyoxyethylene (10) Nonylphenyl Ether E1 Lauryldimethylbenzylammonium Chloride

[Example 178]
Silicon dioxide (A1) in an amount of 5% by weight as a defoaming component (A) and sodium dioctylsulfosuccinate (B1-1) in an amount of 95% by weight as an anionic surfactant (B) were blended in an amount of 95% by weight. Water was added so that the ratio was 6% by weight, and then the pH was adjusted to 3 with lactic acid to prepare an antifoaming agent. Next, a fluorofoam fire extinguishing agent (Megafoam (registered trademark) AGF-3T, manufactured by DIC Co., Ltd., hereinafter simply referred to as AGF-3T) was foamed 20 times in the same manner as in Example 1, and 500 mL was placed in a 500 mL beaker. After adding the foam, 15 mL of the prepared defoaming agent was sprayed over 30 seconds. The foam height was 400 mL immediately after spraying, but became 35 mL after 10 minutes and 10 mL after 30 minutes. After 60 minutes, the liquid level was visible and the bubbles almost disappeared.

[Example 179]
Silicon dioxide (A1) is 15% by weight as the defoaming component (A), 75% by weight of sodium dioctylsulfosuccinate (B1-1) is used as the anionic surfactant (B), and ethylene glycol (C1) is used as the other component (C). Was mixed well with a glass rod, water was added so that the non-volatile content was 6% by weight, and then the pH was adjusted to 11 with sodium carbonate to prepare an antifoaming agent. Next, the fluorine-based foam fire extinguishing agent (AGF-3T) was foamed 20 times in the same manner as in Example 1, 500 mL of foam was placed in a 500 mL beaker, and then 15 mL of the prepared defoaming agent was sprayed over 30 seconds. When sprayed, the foam height was 400 mL immediately after spraying, but became 20 mL after 10 minutes, and after 30 minutes, the liquid level was visible and the bubbles almost disappeared.

[Example 180]
Silicon dioxide (A1) was blended in an amount of 5% by weight as a defoaming component (A), and sodium dioctylsulfosuccinate (B1-1) was blended in an amount of 95% by weight as an anionic surfactant (B), in the same manner as in Example 178. An antifoaming agent was prepared. The pH of the prepared defoaming agent was 3. Next, a protein-based foam fire extinguishing agent (manufactured by Yamato Protec Co., Ltd.) was foamed 10 times in the same manner as in Example 136, 300 mL of foam was placed in a 300 mL beaker, and then 15 mL of the prepared defoaming agent was applied over 30 seconds. When sprayed with a spray, the foam height was 200 mL immediately after spraying, but became 20 mL after 10 minutes, 5 mL after 30 minutes, the liquid level was visible after 60 minutes, and the bubbles almost disappeared. It became.

[Example 181]
Silicon dioxide (A1) is 15% by weight as the defoaming component (A), 75% by weight of sodium dioctylsulfosuccinate (B1-1) is used as the anionic surfactant (B), and ethylene glycol (C1) is used as the other component (C). Was blended in an amount of 10% by weight to prepare an antifoaming agent in the same manner as in Example 179. The pH of the prepared defoaming agent was 11. Next, a protein-based foam fire extinguishing agent (manufactured by Yamato Protec Co., Ltd.) was foamed 10 times in the same manner as in Example 136, 300 mL of foam was placed in a 300 mL beaker, and then 15 mL of the prepared defoaming agent was applied over 30 seconds. When sprayed with a spray, the foam height was 220 mL immediately after spraying, but became 20 mL after 10 minutes, and after 30 minutes, the liquid level was visible and the bubbles almost disappeared.

As can be seen from Tables 1 to 5, Tables 9 to 11 and Examples 178 to 181, the defoaming agents according to the examples are the defoaming component (A), the anionic surfactant (B), and the nonionic surfactant ( A defoaming agent for a foam fire extinguishing agent containing at least one selected from D) and a cationic surfactant (E), wherein the component (A) is an inorganic powder (A1) and a silicone component (A2). And at least one selected from metal soap (A3), the anionic surfactant (B) is a sulfonic acid type anionic surfactant (B1), a sulfate ester type anionic surfactant (B2), and a phosphoric acid. The nonionic surfactant (D) contains at least one selected from the ester-type anionic surfactant (B3), and the nonionic surfactant (D) is selected from the polyoxyalkylene alkyl ether (D1) and the polyoxyalkylene alkyl phenyl ether (D2). The weight ratio of the defoaming component (A) to the non-volatile content of the defoaming agent contains at least one, the cationic surfactant (E) contains a quaternary ammonium salt type cationic surfactant (E1), and the weight ratio of the defoaming component (A) to the non-volatile component of the defoaming agent. Since it is 1 to 70% by weight, the bubbles almost disappear after 60 minutes of spraying the defoamer 6% aqueous solution, and the problem of the present application can be solved.
On the other hand, when there is no defoaming component (A) (Comparative Examples 4 to 7, 14 to 15, 22, 29 to 31, 35 to 36, 40), the anionic surfactant component (B) and the nonionic surfactant component (comparative examples 4 to 7, 14 to 15, 22, 29 to 31, 35 to 36, 40). In the case of D) and the absence of the cationic surfactant component (E) (Comparative Examples 1 to 3, 26 to 28), the defoaming component (A) with respect to the non-volatile content of the defoaming agent exceeds 70% by weight (). In Comparative Examples 8 to 13, 16 to 21, 23 to 25, 32 to 34, 37 to 39, 41 to 43), more than half of the bubbles remained even after 60 minutes, and the problem of the present application could not be solved.

Claims (7)

A defoaming agent for a foam fire extinguishing agent, which comprises a defoaming component (A) and at least one selected from an anionic surfactant (B), a nonionic surfactant (D), and a cationic surfactant (E). hand,
The component (A) contains at least one selected from an inorganic powder (A1), a silicone component (A2) and a metal soap (A3).
The anionic surfactant (B) is at least one selected from a sulfonic acid type anionic surfactant (B1), a sulfate ester type anionic surfactant (B2), and a phosphate ester type anionic surfactant (B3). Including
The nonionic surfactant (D) contains a polyoxyalkylene alkylphenyl ether (D2 ) .
The cationic surfactant (E) contains a quaternary ammonium salt type cationic surfactant (E1).
A defoaming agent for a foam fire extinguishing agent, wherein the weight ratio of the defoaming component (A) to the non-volatile content of the defoaming agent is 1 to 70% by weight. The defoaming agent for a foam fire extinguishing agent according to claim 1, wherein the anionic surfactant (B) contains a sulfonic acid type anionic surfactant (B1). The defoaming agent for a foam fire extinguishing agent according to claim 2, wherein the sulfonic acid type anionic surfactant (B1) contains a dialkylsulfosuccinate. The defoaming agent for a foam fire extinguishing agent according to any one of claims 1 to 3 , wherein the quaternary ammonium salt-type cationic surfactant (E1) contains an alkyldimethylbenzylammonium chloride. Claim 1 in which the weight ratio of at least one selected from the component (B), the component (D), and the component (E) to the non-volatile content of the foam extinguishing agent is 30 to 99% by weight. The defoaming agent for a foam fire extinguishing agent according to any one of 4 to 4 . The defoaming agent for a foam fire extinguishing agent according to any one of claims 1 to 5 , which has a pH of 4 or less or 9 or more. The foam extinguishing agent for foam fire extinguishing agent according to any one of claims 1 to 6 , which is for a fluorine-based foam fire extinguishing agent or a protein-based foam fire extinguishing agent.