JPS6176584A - Muddy water material for civil engineering works - Google Patents

Abstract

PURPOSE:A muddy water material having improved solubility in water, good workability and economic efficiency, obtained by dispersing and suspending CMC (sodium salt) in a water-soluble organic liquid. CONSTITUTION:CMC is dispersed and suspended in a water-soluble organic liquid such as a polyhydric alcohol (e.g., polyethylene glycol, etc.), and, if necessary, blended with a thickening agent (e.g., organic bentonite, etc.), to give the aimed material for civil engineering works. A liquid obtained by adding a surface active agent to fats and oils, or by adding a surface active agent to a stock solution of polyurethane is used as the water-soluble organic liquid. EFFECT:Even if CMC has low or high viscosity, it is instantly dissolved in water without requiring complicated operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvement of the solubility characteristics of Cfvl C1, that is, carboxymethylcellulose or its sodium salt, as a main component of a muddy water material for civil engineering.

[Conventional technology]

Conventionally, CMC in this type of field has been widely used as a muddy water generation material for various muddy construction methods such as muddy shield construction method and continuous underground wall construction method, or as an additive for muddy water improvement. Because of this, it is currently necessary to use one with a relatively low viscosity, for example, usually 200 to 800 cP.

This is because the higher the viscosity of CMC, the more particles will stick to each other when dropped into water, forming clumps that are difficult to dissolve and significantly reducing workability. .

Thermal theory, usually used C of relatively low viscosity as mentioned above.
Even though it is MC, it is still inconvenient to handle, and in the past, in this respect, complicated physical or chemical treatments were required in advance at the so-called raw material stage, such as granulating CMC or applying glyoxal coating to the CMC surface. We had no choice but to adopt a very special method of cross-mixing, which required a special mixer to be prepared separately at the construction site to force complete melting.

On the other hand, if CMG with high viscosity is used as a muddy water material, it can be easily imagined that a small amount of ω can be used to make muddy water of a normally used viscosity. Therefore, although low-viscosity CMC is an obvious choice, achieving the simple use of high-viscosity CMC is not only extremely desirable in terms of improving workability at construction sites, but also desirable from an economic point of view. Needless to say, it is.

[Problem that the invention seeks to solve]

Therefore, the purpose of this invention is to process any slurry material mainly composed of CMC, regardless of whether it has a low viscosity or a high viscosity, almost instantaneously without using complicated means or special machines as in the past. It has extremely desirable dissolution characteristics that dissolve in water, and the obtained mud water can develop a predetermined level of viscosity almost immediately after dissolution without causing any separation state, and is easy to handle. Our goal is to provide an unprecedented and revolutionary mud water material for civil engineering that is dramatically superior in economic efficiency and workability.

[Means for solving problems]

To achieve the above object, the present invention employs a CMG liquid phase structure in which CMC is dispersed and suspended in advance in a water-soluble organic liquid as a dispersion medium in the raw material stage, and a thickener is added as necessary.

In other words, by converting the conventional CMG solid muddy material into a suspended liquid muddy material, dissolution in water and the CM
By causing the increase in viscosity inherent in G to appear almost instantaneously and simultaneously, and by using a particularly water-soluble organic liquid as a dispersion medium, the occurrence of liquid-liquid phase separation during dissolution is prevented as much as possible. However, it is characterized in that the dissolved solution can be easily used as it is as muddy water of a predetermined viscosity.

Therefore, it is natural to use CMC with a low viscosity, for example, 1000 to 10
000 cP, which could not be used in the past, can now be easily used as a slurry material, and its technological value is extremely large. Since it has become possible to use CMC, for example, a relatively small amount of C can be used compared to before.
It becomes possible to obtain muddy water with a specified viscosity using MC,
This not only improves workability but also reduces the amount of CMC itself that occupies the muddy water material, resulting in excellent economic efficiency.

By the way, polyhydric alcohols such as polyethylene glycol can be used as the water-soluble organic liquid, but other types of liquids such as oils and fats with a surfactant added or polyurethane stock solutions with a surfactant added can also be used. obtain. In short, any dispersion medium may be used as long as it is a dispersion medium that disperses and suspends CMC and does not cause undesirable phase separation when mixed with water, and is not limited to the above-mentioned examples. It's not something you can do.

Note that when a polyhydric alcohol is used, it is preferable to use one with relatively high viscosity from the viewpoint of preventing precipitation.

Further, as the oil or fat, a wide range of mineral oils, vegetable oils, etc. can be employed.

As the polyurethane stock solution, for example, a mixture of polyol and polyisocyanate can be used, but of course other solutions can also be used. In particular,
When this type of water-soluble organic liquid is used as a dispersion medium, CMC
Coupled with the inherent viscosity effect of polyurethane, the gelling properties of polyurethane itself can produce a specific effect such as a rough thickening effect.

Furthermore, in order to improve the thickening effect, it is also possible to add a thickening agent to the CMC suspension in advance, as described above. In this case, organic bentonite is used as the thickener, but asbestos,
Fibrous materials such as seviolite and attapulgite can also be used. It goes without saying that the thermal thickener is not limited to these, and various other types can be used.

〔Example〕

Polyethylene glycol 70wt% and CMC (viscosity:
A CMC suspension was prepared by mixing 30 wt% of CMC (4500 cP), and this was poured into water. As a result, the suspension dissolved instantly, and at the same time, the viscous state originally possessed by the CMC appeared. Moreover, the produced muddy water did not undergo phase separation.

〔Effect of the invention〕

As mentioned above, this invention aims to simplify the use of CMC muddy water materials, which have particularly remarkable viscosity characteristics and extremely poor dissolution characteristics. Even though the CMC has a high viscosity, it has not only been successfully applied to this type of application, but also made it possible to easily adjust muddy water without using complicated processing or machinery as in the past, improving workability and economy. This made it possible to provide an epoch-making muddy water material for civil engineering with significantly superior properties.

Claims (4)

[Claims] (1) In muddy water materials for civil engineering whose main component is CMC,
A muddy water material for civil engineering, characterized in that the above CMC is dispersed and suspended in a water-soluble organic liquid such as a polyhydric alcohol, and a thickener such as organic bentonite is added as necessary. (2) The muddy water material for civil engineering according to claim 1, wherein the water-soluble organic liquid is polyethylene glycol. (3) The muddy water material for civil engineering according to claim 1, wherein the water-soluble organic liquid comprises oil and fat and a surfactant. (4) The muddy water material for civil engineering according to claim 1, wherein the water-soluble organic liquid comprises a polyurethane stock solution and a surfactant.