JPH01310087A - High anti-putrefactive slush constituent and usage thereof - Google Patents

Abstract

PURPOSE:To maintain stable viscosity for a long period of time and form it into such one that is suited to a slush excavating method by constituting an anti-putrefactive slush constituent with a water soluble polymer or a copolymer whose intrinsic viscosity is more than the specified value and a dispersant. CONSTITUTION:There is provided with a water soluble polymer or copolymer consisting of sulfonate inclusive vinyl monomer 5-100mol% whose intrinsic viscosity is more than 3.0dl/g and at least one type of vinyl compound 0-95mol% other than a sulfonate inclusive vinyl monomer. Then, the copolymer and a dispersant of polyphosphate, nitrophenephosphate, or the like, by way of example, are mixed together at a wt ratio of 95:5-10:90, forming a slush constituent. In addition, this slush constituent is added to slush as much as 0.05-1.0wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mud water composition suitable for mud drilling methods having a stable viscosity over a long period of time, and a method for using the same.

[Prior art] The walls of grooves (pores) are made using muddy water (also called a stabilizer), which is a suspension of clay or bentonite mixed with colloidal polysaccharides such as carboxymethyl cellulose, guar gum, sodium alginate, and α-starch. The so-called muddy water excavation method, in which the ground is excavated while preventing the collapse of the tunnel, the face is stabilized with muddy water, and tunnels are constructed is often used as a non-polluting construction method.

The muddy water used in this muddy drilling method has the ability to form an impermeable mud film (mud cake) through the interaction of clay and bentonite in the muddy water with colloidal polysaccharides, thereby stabilizing trench (hole) walls and faces. It has the following.

However, muddy water containing colloid polysaccharides is prepared from muddy water,
During excavation use, it is susceptible to deterioration due to the contamination of bacteria present in the earth and sand, and as a result, the viscosity of mud and the ability to form an impermeable mud film decrease, and the stabilizing function of the trench (hole) wall and face deteriorates. It is prone to deterioration such as the generation of bad odors and poor dispersion, which also affects the safety of construction work.

When muddy water is used for excavation, there is a high risk of collapse, so it has traditionally been disposed of, but since it also causes a lot of economic loss, anti-deterioration agents are added to prevent the mud from deteriorating.

Salicylic acid, sorbic acid, paraoxybenzoic acid esters, organic sulfur compounds, organic nitrogen compounds, etc. are known as deterioration prevention agents, but these deterioration prevention agents are used to prevent groundwater contamination due to lost sludge during excavation or used waste. Considering the removal treatment of the deterioration prevention agent from the waste mud water, it is impossible to mix a large amount into the mud water. In addition, anti-deterioration agents with high antiseptic or bactericidal effects are highly toxic, and those with low toxicity are less effective, so the reality is that there is still no anti-deterioration agent that is satisfactory in terms of cost and effectiveness. .

Therefore, in order to solve these problems, a method using carboxymethylcellulose with a high degree of etherification (JP-A-58-115376, JP-A-1354
76 Publication), a method using high molecular weight polyethylene oxide (Japanese Unexamined Patent Publication No. 59-15476), and a method using modified polyvinyl alcohol (Japanese Unexamined Patent Publication No. 57-2
3671) has been proposed.

[Problem to be solved by the invention] The rot resistance (bacteria resistance) of cellulose ethers depends on the degree of substitution, and carboxymethyl cellulose with a high degree of etherification (high degree of substitution) has better resistance to etherification during storage than products with a low degree of etherification. Corrosion becomes high.

However, microorganisms (bacteria) attack cellulose ethers on the 1,4-β-glucodide bonds of cellulose molecules and involve ring-opening and cleavage of glucose.
Under severe conditions (temperatures of 30 to 40°C), even products with a high degree of etherification deteriorate.

In addition, methods using high molecular weight polyethylene oxide or modified polyvinyl alcohol are said to be unfavorable due to the properties of muddy water because, although these synthetic polymers have strong resistance to decay, they foam when added to muddy water. There's a problem.

In view of the above points, it is an object of the present invention to provide a muddy water composition and a method for using the same, which eliminates the drawbacks of the prior art. That is, the object of the present invention is to provide a method suitable for muddy water excavation construction that can maintain stable properties as muddy water for a long period of time without using any deterioration prevention agents that may affect the human body or other living organisms. An object of the present invention is to provide a muddy water composition and a method for using the same.

[Means for Solving the Problems] The highly rot-resistant mud water composition of the present invention has an intrinsic viscosity [η] of 3
．． OdII/g or more of a sulfonate-containing vinyl monomer 5 to 100 mol% and at least one type of vinyl compound other than the sulfonate-containing vinyl monomer 0 to 100 mol%
It is characterized by consisting of a water-soluble polymer or copolymer of 95 mol% and a dispersant. Further, the method for using the muddy water composition of the present invention is to apply the muddy water composition to muddy water at a rate of 0.
It is characterized by adding 0.05 to 1.0% by weight.

[Function] The muddy water to which the muddy water composition of the present invention has been added exhibits stable viscosity even when stored for a long period of time at a temperature suitable for bacterial propagation, and the ability to reduce the volume of water is maintained. Also, unlike polyethylene oxide or modified polyvinyl alcohol, it does not foam and has good muddy water properties. Furthermore, it is highly resistant to cement and salt water, and there is no need to use a deterioration prevention agent that poses a safety problem, making it possible to produce safe muddy water.

[Example 2] The rot-resistant muddy water composition of the present invention comprises a water-soluble polymer or copolymer and a dispersant, and the water-soluble copolymer further comprises a sulfonate-containing vinyl monomer and at least one kind. and other vinyl compounds.

As the sulfonate-containing vinyl monomer in the present invention, for example, vinyl sulfonate, 2-acrylamide 2-methylpropanesulfonate, etc. can be suitably used, but the present invention is not limited to these. Other sulfonate-containing vinyl monomers can also be used as long as the polymers and copolymers are water-soluble and do not foam with the stabilizing liquid.

The intrinsic viscosity [η] of vinyl monomer containing sulfonate is 3
．． OdN/g or more, and if it is less than 3.0 dl/g, the thickening ability of muddy water and the ability to reduce the amount of fresh water decrease, and a large amount must be added, which is uneconomical. Note that the intrinsic viscosity [η] is 30% using 1N-NaCl as a solvent.
API was determined at ℃.

In addition, the content of the sulfonate-containing vinyl monomer in the water-soluble copolymer is 5 to 100 mol%, and <20 to 50 mol%.
It is mole%. If the content is less than 5 mol%, the cement resistance and salt resistance of muddy water will decrease, which is not preferable.

Other vinyl compounds that can be used in the water-soluble copolymer include not only water-soluble monomers but also water-insoluble monomers as long as the copolymer exhibits water-solubility. I can do it. -Generally useful vinyl compounds include the following. i.e. acrylamide,
Methacrylamide, acrylic acid, methacrylic acid and water-soluble salts thereof, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, hydroxyethyl acrylate and hydroxyethyl methacrylate. The amount of vinyl compound used is 0 to 95 mol%.

As the method for producing the copolymer, any conventional method for polymerizing acrylic monomers can be used. Note that as the salt of the copolymer, ammonium salt, sodium salt, potassium salt, etc. can be suitably used.

Specific examples of the dispersant used in the present invention include polyphosphates such as sodium tripolyphosphate and sodium hexametaphosphate, nitrofumates, ligninsulfonates, and polyacrylates, which are commonly used as muddy water dispersants. Things can be given.

The ratio (weight ratio) of the copolymer to the dispersant varies depending on the properties of the muddy water and the purpose of use, but is usually 95:5 to 10:90, preferably 95:5 to 50:50.

The muddy water composition of the present invention has a ratio of 0.05 to 1.0 relative to muddy water.
It is preferable to add % by weight. If it is less than 0.05%, the viscosity increasing property and the total drainage reduction property will be insufficient. If it exceeds 1.0%, the viscosity of the stabilizer becomes too high, making it difficult to use as a stabilizer and increasing the cost of the stabilizer 51a2.

The muddy water in the present invention contains one or more types of inorganic clay such as montmorillonite, attapulgite, sericite, and kaolinite, and the content thereof varies depending on the purpose of use. In general, inorganic clay is contained in the range of 0.5 to 1 (1 part by weight) per 100 parts by weight of water. ) is about 0.5 to 10 parts by weight, and those used in muddy water shielding method are about 10 to 50 parts by weight.
It is said that inorganic clay should preferably be contained in an amount of about 50 to 100 parts by weight in slurry used in the slurry shield method. The composition of the present invention can be effectively applied to any muddy water.

The muddy water composition of the present invention may further include commercially available clay, excavated silt, clay, soda ash, etc.
! It may also contain additives (materials) such as a J binder, a sludge prevention agent such as cottonseed residue, and a water-soluble polymer compound such as carboxymethyl cellulose or a starch derivative.

Next, the rot-resistant muddy water composition of the present invention will be explained based on Examples, but the present invention is not limited to these Examples.

Example 1 Acrylamide (hereinafter referred to as AM) 49.7g.

To a mixed solution consisting of 88.7 g of sodium 2-acrylamide 2-methylpropanesulfonate (hereinafter referred to as 8MPS) and 500 g of ion-exchanged water, 0.01 g of ammonium persulfate was added as a polymerization catalyst, and O.I.G of sodium sulfite was added as a reducing agent. In addition, aqueous polymerization was carried out to obtain a copolymer solution having a solid content of about 20% by weight. After vacuum drying this copolymer solution, the solid matter was pulverized to obtain a powdery copolymer.

The intrinsic viscosity [η] of the obtained powder copolymer was 5.0, and the molar ratio of AM to AMPS was 5:5.

Examples 2 to 6 Mud water compositions were prepared in the same manner as in Example 1, except that the components and molar ratios were changed to those shown in Table 1.

Comparative Examples 1 to 3 Mud water compositions were produced in the same manner as in Example 1, except that the components and molar ratios were changed to those shown in Table 1.

Preparation Examples 1 to 6 and Comparative Preparation Examples 1 to 3 Bentonite (Royal 5A-B) is added to 100 parts by weight of fresh water.

3 parts by weight of sodium polyacrylate (average molecular weight: 6000) and muddy water composition (obtained in Examples 1 to 6 or Comparative Examples 1 to 3) as shown in Table 1. Mud water was prepared by adding the amount shown in , and its properties were measured.

In addition, in order to confirm the salt resistance, the viscosity was measured when 10% by volume of 4% saline was added to the muddy water. Results first
Shown in the table.

[From Table 1 in the margin below, muddy water using the muddy water composition of the present invention had a small amount of purified water immediately after preparation, and even after adding salt water, both the decrease in viscosity and the increase in the amount of purified water were small.

On the other hand, muddy waters using the muddy water compositions of Comparative Examples 1 to 3 showed a large amount of reactor water immediately after preparation (Comparative Preparation Example 1), decreased viscosity after addition of salt water, and significantly increased amount of reactor water. (Comparative Preparation Examples 2-3).

Note that when the muddy water composition of the present invention was used to prepare muddy water, no foaming was observed.

Examples 7 to 9 Mud water compositions were prepared in the same manner as in Example 1, except that the components and molar ratios were changed to those shown in Table 2.

Comparative Example 4 A muddy water composition was prepared in the same manner as in Example 1 except that the components and molar ratios were changed to those shown in Table 2.

Preparation Examples 7 to 11 and Comparative Preparation Examples 4 parts 6 90 parts by weight of well water, 10 parts by weight of putrid mud water, 3 parts of bentonite (Kunigel V+, manufactured by Kunimine Kogyo ■), 0.3 part of sodium tripolyphosphate and mud water composition (implementation) Example 2, Example 5
, obtained in Examples 7 to 9 or Comparative Example 4) Mud water was prepared by adding guar gum or carboxymethyl cellulose.

The obtained muddy water was stored in a thermostat at 30° C., and changes in viscosity over time were measured. The results are shown in Table 2.

Note that as the putrid mud water, muddy water with reduced viscosity and a foul odor collected from a waste mud water treatment plant was used.

[Margins below] Table 2 shows that the muddy water using the muddy water composition of the present invention hardly exhibits a decrease in viscosity, while the muddy water of Comparative Preparation Example 1 (AM
/AMPS-6: 4,[η]-1,9) requires about twice the amount added, and furthermore, it can be seen that guar gum and carboxymethylcellulose show an extreme decrease in viscosity at an early stage.

[Effects of the Invention] As explained above, according to the rot-resistant muddy water composition of the present invention, (1) changes in viscosity due to deterioration can be almost completely suppressed, and there is no need to add a deterioration inhibitor; 2) Since it does not change in quality, it is possible to stop work for a long time when drilling using muddy water, (3) it does not foam like conventional synthetic polymers, and (4) the properties of the prepared muddy water. Since there is almost no difference from the conventional CMC system, the effect is that conventional equipment and equipment can be used as is.

Claims (1)

[Scope of Claims] 1. 5 to 100 mol% of a sulfonate-containing vinyl monomer having an intrinsic viscosity [η] of 3.0 dl/g or more, and at least one other than the sulfonate-containing vinyl monomer. A highly rot-resistant muddy water composition comprising a water-soluble polymer or copolymer comprising 0 to 95 mol% of a vinyl compound of various types and a dispersant. 2 The ratio (weight ratio) of copolymer to dispersant is 95:5 to 1
The muddy water composition according to claim 1, wherein the ratio is 0:90. 3.0.05% of the muddy water composition according to claim 1 to muddy water.
A method of using a muddy water composition characterized by adding ~1.0% by weight.