JPS62153382A - Foaming agent for suspensions - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a foaming agent for use in aqueous suspensions of clay minerals having excellent foaming properties and excellent foam stability.

b. Conventional technology Foaming agents are generally ionic or nonionic.

In addition, protein-based substances and cellulose-based water-soluble polymer substances may also be used.

Generally, the generation of bubbles involves foaming due to mechanical action,
The foaming agent of the present invention is a substance that generates bubbles by mechanical action and is effective in retaining the bubbles. In particular, it has the function of stabilizing and maintaining the bubbles for a long period of time after foaming a suspension of clay minerals such as bentonite and self-sustaining earth.

Problems to be Solved by the C0 Invention Conventionally, general surfactants have been used as foaming agents for suspensions of clay minerals. But over time,
It lacked long-term stability, with multiple bubbles coalescing and even breaking. Furthermore, under pressure, the bubbles were destroyed and there was no stability of the bubbles.

d. Means for Solving the Problems In order to obtain a stable aerated fluid in which the bubbles do not collapse even after repeated circulation under pressure, the present inventors
I have been conducting intensive research. As a result, the foaming agent of the present invention was obtained.

The foaming agent of the present invention is composed of an appropriate mixture of one or more anionic surfactants.

The aerated foam fluid using the foaming agent according to the present invention has excellent foam stability, does not collapse under pressure, and has excellent flow characteristics.

In particular, when a suspension containing clay minerals is foamed using the foaming agent of the present invention, the resulting aerated foam fluid exhibits excellent stability even under pressure changes and has excellent fluidity. Therefore, it can be suitably used as a drilling fluid.

In addition, the aerated foam fluid containing clay minerals using the foaming agent of the present invention is easy to separate excavated soil when used as a drilling fluid, and has good fluidity and water permeability as a drilling fluid. Excellent suppressive effect.

Therefore, when the aerated foam fluid is used as a circulating fluid in an earth pressure shield construction method, it exhibits excellent water-stopping effects and excellent properties in separating excavated soil.

Another example of a shield construction method using a fluid containing bubbles is Japanese Patent Publication No. 47560/1983. In this type of earth pressure shield construction method, slurry in which self-supporting soil and bentonite are suitably suspended is used as the circulating fluid. However, when proceeding with shield construction using this slurry, there were many problems in the progress of the construction, such as the shielding machine becoming sticky and the separation of the excavated soil from the slurry being difficult.

In such a shield construction method, the aerated foam fluid using the foaming agent of the present invention has excellent flow characteristics, can easily separate excavated soil, has a water-stopping effect, and contains stable bubbles, making it an excellent fluid. It is.

In the present invention, the anionic surfactant used is a compound containing a carboxyl group, a sulfone group, or a sulfate group.

For example, examples of surfactants containing carboxyl groups include polyacrylic acid and polymethacrylic acid.

Na of other carboxyl group-containing compounds such as polyvinyl acetate, oleic acid, higher fatty acids of linoleic acid, etc.
Refers to alkali metal salts such as K or ammonium salts.

Examples of surfactants containing sulfonic groups include polyalkylsulfonic acids, polyalkylbenzenesulfonic acids, naphthalenesulfonic acid formalin condensates, ligninsulfonic acids, petroleum sulfonic acids, and other alkali metal salts of compounds containing sulfonic groups, (Ha, K salt, etc.) or ammonium salt.

As the surfactant containing a sulfate group, a surfactant containing a sulfate ester can generally be used. Examples include lauryl sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkylphenol ether sulfate, higher alcohol sulfate, and other alkali metal salts (such as Na and K salts) or ammonium salts of sulfuric esters.

The foaming agent of the present invention is an appropriate mixture of one or more of these compounds. This foaming agent has an excellent foaming effect, the resulting foam is stable against pressure changes, the aerated foam fluid has excellent fluidity, and when used for excavation, excavated soil can be easily separated and stopped. Excellent water effect.

e. Function The foaming agent of the present invention is formed by adding and mixing 0 to 1 part by weight of a carboxyl group and/or sulfuric acid ester surfactant to 1 part by weight of a surfactant having a sulfonic acid group, for example. It is.

The obtained foaming agent is foamed by adding, for example, 0.1 to 2.0 parts by weight to 100 parts by weight of mud odor, which is a circulating fluid in the shield construction method, to create a bubble-containing fluid.

This bubble-containing fluid has excellent fluidity and can be fed with a small pump pressure. This bubble-containing fluid has a clean water effect that suppresses spring water at the excavation face in the shield method, and also effectively suppresses water in the fluid from escaping into the formation, maintaining the fluid flow characteristics and stabilizing it. Make it something.

Further, the circulating fluid for the shield construction method foamed with the foaming agent of the present invention has other characteristics such that excavated soil can be easily separated, and the separated excavated debris has a low water content and is easy to handle. It is also stable against pollution.

f. Example [Example 1] 50 parts by weight of self-supporting soil (produced in Gifu), 16 parts by weight of bentonite (produced in Gunma), and 75 parts by weight of water are sufficiently stirred with a mortar mixer to make slurry (referred to as basic slurry).

Next, inventions 1 to 5 are prepared as shown in the table below.

Inventive product 1 was added to the above basic slurry at 0, 0.1.0.4.0
．． 5°1.0 was added, and stirred and foamed in a mortar mixer for 10 minutes to obtain an aerated foam fluid.

(11 bubble mixing ratio, (2) flow characteristics (
(clay), and (3) drainage amount (l117, which is used to judge the water-stopping effect).

(1) Bubbles mixing ratio A: Volume of additive-free fluid of the present invention (m 1 ) B: Volume after foaming (m A ) (2) Flow characteristics (viscosity) This is the value when the rotational speed of the rotor is set to 12.3 Orpm using a motor (manufactured by 1).

(3) Drainage volume (ml) Measurement of the main drainage amount was carried out using the equipment shown in the attached drawings.

In the figure, when the upper surface of the water 1 is pressurized with pressurized gas from the air supply port 2, the water passes through the glass soil layer 3, enters the mud 1A4, is blown up by the paper 5, and enters the measuring cylinder 6.

In commercially available products, the bubbles increase in diameter over time and are destroyed by pressurization, resulting in a decrease in the amount of bubbles contained, and there is no movement to suppress the amount of drainage.

[Example 2] Inventive products 2, 3, and 4゜5 were added at 0.3% each to the basic slurry of Example 1, and the results were as follows: The minute pressurization m1) was measured.

[Brief explanation of drawings]

The drawing is a schematic diagram showing an apparatus for measuring the drainage amount of slurry using the foaming agent of the present invention and slurry using the overprint foaming agent. ■...water layer, 2...pressurized air supply port, 3...glass soil layer, 4...sludge, 5...
・1 paper, 6... graduated cylinder, 7...
·container. Procedural amendment stamp button 1, Indication of the case 1985 Patent Application No. 295343 2, Name of the invention Foaming agent for suspensions 3, Relationship with the case by the person making the amendment Name of the patent applicant Tel Su Co., Ltd. G4. Agent 〒
107 (2 other people) 5. Subject of amendment 61.2.2C・Contents of amendment +11 In the 7th line of page 4 of the specification, the phrase “of this kind” is corrected to “but in general”, and in the same page, Delete "However," in line 1O. (2) Same, in the third line from the bottom of page 12, the text "4...sludge" is corrected to "4...sludge and glass soil layer." (3) Correct the drawing as shown in the attached sheet.

Claims (1)

[Scope of Claims] 1. A foaming agent for suspensions of clay minerals, which is a mixture of one or more selected surfactants containing anionic groups. 2. The surfactant has a carboxy group as an anion group,
The foaming agent according to claim 1, which has a sulfate group and a sulfone group. 3. 0 to 1 part by weight of a surfactant having a carboxyl group and/or a sulfuric acid group to 1 part by weight of a surfactant having a sulfone group.
The foaming agent according to claim 1, which is obtained by adding and mixing 1 part by weight. 4. The foaming agent according to claim 1, wherein the anionic group-containing surfactant comprises an alkali metal salt and/or an ammonium salt.