JP2011241337A - Frothing agent for air-foam drilling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frothing agent for air-foam drilling, wherein the frothing agent has foaming properties and excellently prevents bubble release from occurring again at the time of drainage treatment.SOLUTION: The frothing agent consists primarily of a fatty acid soap.

Description

  The present invention relates to a foaming agent for excavating bubbles.

  Conventionally, when excavating using a drilling machine or when drilling rock bolt holes or anchor bolt holes using a rock drilling machine when tunneling, excavation work or drilling work is performed smoothly. At the same time, a large amount of water has been used to suppress the generation of dust.

  However, the amount of water used is very high at 30-60 / liter per minute, which sometimes hurts the natural ground, water penetrates into the natural ground, and the loosening area expands. There is also a concern that a crack will occur and this will reach the face and cause a minor collapse. There was also a problem that a large amount of muddy water had to be treated.

  Therefore, in Patent Document 1 below, a foam-like dural foam in which bubbles having a hard film are connected is sent to the excavation surface, and excavation plane is rotated by a rotating bit while excavating debris attached to the dura foam and discharging it. In the dura foam excavation method, a foaming agent solution mainly composed of a nonionic surfactant and an anionic surfactant is used as a foaming agent solution for generating the dural foam, and micelles are used. The generated foaming agent is foamed to form fine bubbles covered with surface-active micelles, and the fine bubbles are dispersed in an air supply fluid to form an aerosol, and a predetermined pressure is applied to the drilling surface. A bubble excavation method has been proposed in which the fine bubbles are injected from the bit onto the excavation surface to expand the fine bubbles to form the dura bubbles.

  In this conventional excavation method, bubbles generated by foaming a liquid containing a foaming agent are blown against the propulsion direction of the earth pressure shield, and excavation is performed while mixing the excavated soil and the bubbles, and the amount of water used. In addition to preventing the occurrence of water penetration and cracks in the natural ground, it improves the excavation resistance and friction resistance of the face and the workability of excavation soil transport processing.

  Further, in Patent Document 2 below, bubbles to be sent from a bubble generating device are mixed into compressed air being supplied from a compressed air supply source to a rock drill, and the bubble-containing compressed air is ejected from a bit of the rock drill. In addition, a drilling method has been proposed in which holes are drilled while discharging powder into a slurry by bubbles.

  In this drilling method, without using a large amount of water, the dust can be slurried with bubbles, and the slurry can be discharged out of the holes by the flushing action of the subsequent bubble-containing compressed air to suppress the generation of dust. At the same time, the excavation resistance and frictional resistance of the face can be suppressed.

JP 2003-120165 A Japanese Patent Publication No. 6-60553

  However, the conventional bubble drilling method and drilling method can solve the problems caused by a large amount of water in the conventional method, but the main component of the foaming agent used in the bubbles is mainly Since anionic surfactants with excellent foaming properties such as alpha olefin sulfonates and alkyl ether sulfates are used, it can be used to treat mud discharged from holes drilled by air bubbles using surfactants. Has a problem that it needs to be defoamed using an antifoaming agent, and if defoaming is insufficient, it re-foams during wastewater treatment and contributes to environmental pollution.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a foaming agent for bubble drilling that has foamability and is excellent in suppressing refoaming during wastewater treatment. .

  In order to solve the above-mentioned problems, the invention described in claim 1 is characterized by comprising fatty acid soap as a main component.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the fatty acid soap is a fatty acid potassium soap.

  According to the first and second aspects of the present invention, the main component is fatty acid soap, particularly fatty acid potassium soap, so that the foaming property is excellent, and the occurrence of water penetration and cracks in the natural ground is suppressed. In addition, the excavation resistance and friction resistance of the face can be improved, and the workability of excavation soil transport processing can be improved.

  In addition, it is not necessary to use a defoaming agent in the treatment of the muddy water discharged by the drilling holes, thus reducing the cost of excavation work and suppressing re-foaming during wastewater treatment. Can be considered.

The fatty acid soap (RCOOM), which is the main component of the foaming foaming agent of the present invention, may be either a natural or synthetic raw material, and fatty acid salts, organic base soaps, metal soaps, fatty acid derivatives, etc. are used. be able to.
Among them, in particular, fatty acid potassium soap (RCOOK) is excellent as a foaming agent for excavation. Further, even if fatty acid sodium soap (RCONa) is used, an excellent effect can be obtained.

  In addition, fatty acids as fatty acid soap (RCOOM) are C6-C28 capric acid, lauric acid, coconut fatty acid, myristic acid, palmitic acid, stearic acid, beef tallow fatty acid, hydroxystearic acid, behenic acid, oleic acid, Such as sunflower oil fatty acid. Examples of the salt of fatty acid soap include potassium and sodium.

  Organic base soaps include ethanolamine soap and cyclohexylamine soap.

  Examples of the metal soap include zinc soap, aluminum soap, calcium soap, magnesium soap, and barium soap.

  Furthermore, fatty acid derivatives include butyl stearate, medium chain fatty acid glyceride, saturated fatty acid triglyceride and the like as fatty acid esters, lauric acid chloride and stearic acid chloride as fatty acid chlorides, and dodecylamine and alkylamines as amines.

  In addition, the foaming agent of the present invention includes an anionic surfactant, a water-soluble inorganic metal salt, a nonionic surfactant, an amphoteric surfactant, a water-soluble organic solvent, a water-soluble polymer, and a cationic surfactant as necessary. Further, a water reducing agent, a dispersing agent or the like may be used in combination. In particular, anionic surfactants have the effect of improving foaming power. However, since it may re-foam when used, it is necessary to pay attention to the amount. In addition, the water-soluble organic solvent has an effect on product stability and has an effect of smoothing bubbles.

Anionic surfactants include alpha olefin sulfonate, alkylbenzene sulfonate, alkyl sulfate ester salt, alkyl ether sulfate ester salt, sulfosuccinate, ether carboxylate, methyl taurate, etc. A seed or a mixture of two or more can be used.
In addition, the addition amount of an anionic surfactant is 0.01-50 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 0.1-10 weight part.

Examples of water-soluble organic solvents include those that do not inhibit foaming properties, such as cellosolve solvents (such as methyl cellosolve, ethyl cellosolve, and butyl cellosolve), carbitols (such as ethyl carbitol and butyl carbitol), and added moles of ethylene oxide. Polyoxyethylene lower alkyl ethers having 3 to 10 numbers, diols (ethylene glycol, diethylene glycol, etc.) and the like, and one or a mixture of these can be used. Of these, cellosolve solvents and diols are preferable, and butyl cellosolve, isobutyl cellosolve, ethylene glycol, and diethylene glycol.
In addition, the addition amount of a water-soluble organic solvent is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 5-70 weight part.

Further, examples of water-soluble inorganic metal salts include sodium salts (sodium sulfate, sodium chloride, etc.), potassium salts (potassium sulfate, potassium chloride, etc.), magnesium salts (magnesium sulfate, magnesium chloride, etc.), calcium salts (calcium sulfate, etc.). , Calcium chloride, etc.), or a mixture of two or more of these can be used. Of these, preferred are magnesium sulfate and sodium sulfate.
In addition, the addition amount of water-soluble inorganic metal salt is 0-50 weight part normally with respect to 100 weight part of fatty-acid soap foaming components, Preferably it is 0.01-10 weight part.

Examples of the nonionic surfactant include an alkyl ether type, an alkylphenol type, an alkyl ester type, a sorbitan ester type, a sorbitan ester ether type, and the like, and one or a mixture of two or more thereof can be used. Of these, the alkyl ether type is preferable.
In addition, the addition amount of nonionic surfactant is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 1-30 weight part.

Examples of the water-soluble polymer include cellulose derivatives (methyl cellulose, hydroxyethyl cellulose, etc.), polyvinyl alcohol, sodium alginate, polyvinyl ether and the like, and one or a mixture of two or more thereof can be used. Of these, cellulose derivatives are preferable.
In addition, the addition amount of water-soluble polymer is 0-30 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 0.01-20 weight part.

Furthermore, examples of the cationic surfactant include those that do not inhibit foaming properties, such as monoalkylammonium chloride, dialkylammonium chloride, EO-added ammonium chloride, tetramethylammonium chloride, and benzyltrimethylammonium chloride. Of these, monoalkylammonium chloride is preferable.
In addition, the addition amount of a cationic surfactant is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 1-30 weight part.

Moreover, as an amphoteric surfactant, what does not inhibit foaming property, for example, an alanine type, an imidazolinium betaine type, an aminopropyl betaine type, an amino dipropion type etc. are mentioned. Of these, imidazolinium betaine type is preferable.
In addition, the addition amount of amphoteric surfactant is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 1-30 weight part.

And as a water reducing agent, what does not inhibit foamability, For example, polycarboxylic acid type, lignin type, sulfamine type, naphthalene sulfonic acid type, alkyl sulfate ester salt, etc. are mentioned. Of these, polycarboxylic acids are preferred.
In addition, the addition amount of a water reducing agent is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 1-50 weight part.

Furthermore, the dispersant does not inhibit foaming properties, and examples thereof include naphthalene sulfonic acid type, alkyl naphthalene sulfonic acid type, polycarboxylic acid type, polystyrene sulfonic acid type, alkyl amine type, and alkyl phenol type. Of these, polycarboxylic acids are preferred.
In addition, the addition amount of a dispersing agent is 0-100 weight part normally with respect to 100 weight part of fatty acid soap, Preferably it is 1-50 weight part.

  Moreover, tap water, ground water, rain water, seawater, etc. can be used for the water which dilutes the foaming agent of this invention.

  And, when using the foaming agent of the present invention for bubble excavation, the foaming agent is previously foamed in the form of an aqueous solution, and the bubbles are sent to the excavation surface and mixed with the excavated soil, Alternatively, it is possible to employ a method in which bubbles foamed using a foaming device are continuously sent to the excavation surface and mixed with excavated soil.

  In both the method of foaming the foaming agent in the form of an aqueous solution in advance and the method of creating bubbles using a foaming device, when bubbles are sent to the excavation surface and mixed with excavated soil, they are generated. Various conventional admixtures can be used in combination as required depending on the range in which the foaming effect of the foaming agent is not inhibited. Examples of these admixtures include known water-soluble polymers (such as methylcellulose and sodium polyacrylate), thickeners (such as xanthan gum, guar gum, and sodium alginate), clay minerals (such as bentonite), and superabsorbent resins. be able to.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

  Using the foaming agent shown in Table 1, a foaming test and a re-foaming test were performed to obtain [Example 1], [Example 2], and [Comparative Example 1].

In [Example 1], fatty acid potassium soap (trade name “HGR-30K”, manufactured by Miyoshi Oil & Fats Co., Ltd.) is used. In [Example 2], 95% by weight of fatty acid potassium soap and sodium alpha olefin sulfonate ( In the case of [Comparative Example 1], a product name “OK-1” containing sodium alpha olefin sulfonate as a main component is used. (Daiichi Kasei Sangyo Co., Ltd.) was used.
OK-1 is a foaming agent used for excavating natural ground in the bubble shield method.

[Foaming test]
A dilute aqueous solution prepared by adjusting each foaming agent with water so that the concentration was 0.3% by volume and 0.6% by volume was foamed under the following foaming conditions, and the maximum foaming ratio was measured.
Foaming condition Dilution liquid discharge rate: 10L / min
Air pressure: 0.4 MPa
Water temperature / temperature: 20 ± 2 ℃

The foaming was carried out using a foaming apparatus containing peanuts, the air flow rate was adjusted with a valve, air bubbles were taken into a 1 liter container, the weight (g) was measured, and the foaming ratio was calculated by the following formula. The results are shown in Table 2.
Foaming magnification (times) = 1000 / bubble mass (g)
In addition, it can be said that the bubble power of a foaming agent is excellent, so that a foaming ratio is large.

  From Table 2, the foaming agent for excavation is used by adjusting the foaming ratio according to the hardness and moisture of the natural ground, so the foaming ratio can be adjusted by adjusting the concentration of the foaming agent of the present invention. Was confirmed.

[Refoaming test]
Cement water is sprayed after excavating the natural ground with an excavator. The mixture of the excavated mud water, cement water, and washing water is subjected to pH adjustment and water separation treatment. Since there is a step in the water channel such as mud water, bubbles are generated when the foaming agent having the surface activity ability remains. Further, since carbon dioxide gas is bubbled in pH adjustment, bubbles are generated when a foaming agent having a surface active ability remains in the same manner as a step in a water channel.

A refoaming test was performed assuming such a case.
In a 100 mL cylinder, 20 mL of an aqueous solution after foaming with a foaming agent of [Example 1] [Example 2] and [Comparative Example 1], 0.6% by volume dilute aqueous solution and 40 mL of water, cement (ordinary Portland cement: 0.5 g of Taiheiyo Cement Co., Ltd. was added, the upper part of the cylinder was sealed, shaken up and down 10 times, the amount of bubbles after 10 seconds after standing was measured, and the results are shown in Table 3.

  Needless to compare with the foaming agent of [Comparative Example 1], it was confirmed that the foaming agent of the present invention had no re-foaming.

According to the above examples, the foaming agent of the present invention has a foaming power for excavating natural ground, and is excellent in that there is no re-foaming property in the wastewater treatment process.
Therefore, by using the foaming agent of the present invention, excavation of the natural ground can be performed satisfactorily and wastewater treatment can be easily performed.

  In the above embodiment, the foam drilling agent for bubble drilling of the present invention has been described only when used for excavation or drilling. However, the present invention is not limited to this and can be used for, for example, a shield method. It is.

  It can be used when excavating or drilling natural ground.

Claims (2)

  A foaming agent for bubble drilling characterized by comprising fatty acid soap as a main component.   The foaming agent for bubble drilling according to claim 1, wherein the fatty acid soap is a fatty acid potassium soap.