JP2002030282A - Agent for preventing soil attachment in engineering work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material hardly giving influences on the environment, good in wettability to a working face of an excavator, capable of forming a weak bonding among particles of earth and sand, capable of reducing the friction between the working face of the excavator and the earth and sand by a water absorbing layer of a hydrophilic functional group of a polymer adsorbed on the surface of the earth and sand, and capable of preventing the dug particles of the earth and sand from attaching to the working face. SOLUTION: This agent for preventing the attachment of adhesive soil in engineering work comprises a copolymer of (meth)acrylamide, and (meth)acrylic acid or a salt thereof, dispersed in an aqueous solution of an inorganic salt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agent for preventing the adhesion of excavated earth and sand to the face of an excavator in a shield method, a small-diameter propulsion method, or the like.
More specifically, when the excavator encounters highly viscous clay such as a clay layer and a clay layer, it prevents the excavator's face from adhering to the excavated earth and sand, thereby making the excavator smooth and stable. The present invention relates to an adhesive agent for preventing the adhesion of soil to civil engineering, which ensures propulsion, makes it difficult to discharge excavated earth and sand, and prevents an accident leading to blockage in advance. More specifically, the adhesive for soil adhesion prevention for civil engineering according to the present invention comprises a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof dispersed in an aqueous solution of an inorganic salt. By generating pseudo-aggregation in the excavator, water in the excavated earth and sand is guided to the surface of the earth and sand particles, preventing the excavator's face from adhering to the excavated earth and sand, thereby facilitating smooth and stable propulsion of the excavator. is there.

[0002]

2. Description of the Related Art A shield excavator in a shield method excavates earth and sand in front of a face by using a face, and discharges the excavated material out of the apparatus to form a tunnel. A method of injecting a large amount of water in order to prevent the adhesion of the excavated soil to muddy excavated earth and sand and discharging the muddy water. In addition, for the purpose of improving the efficiency of excavation, clay minerals such as bentonite and montmorillonite are added as a muddy agent, and the muddy agent is evenly sprayed on the face face to excavate the surface of the excavated sediment particles. Methods for imparting lubricity and particle dispersibility are also being studied.

[0003] However, these methods generate a large amount of muddy water, and the secondary treatment of the muddy water is very expensive and time-consuming. In addition, there is a risk of muddy water flowing out of the muddy water pool, which is not preferable from the viewpoint of environmental conservation.
Although a method of using these together with a polymer flocculant has been practiced, it is not preferable because soil removal, that is, the amount of industrial waste increases.

Japanese Patent Publication No. 63-42077 discloses a construction problem in which a superabsorbent resin such as a partially hydrolyzed starch-methacrylate graft copolymer is dispersed in an oil such as turbine oil. There has been proposed a method of absorbing water in a short time to form a gel, but the effect of merely absorbing excess water is insufficient, and the effect of preventing adhesion of the adhesive soil is not sufficient.

[0005] In order to prevent the excavated soil from adhering to the face, a method using a dilute solution of various surfactants has been used, but the BOD and COD values in the wastewater are increased, which is not environmentally preferable. In addition, although a method using a reverse-phase emulsion dilution solution of an acrylic polymer or the like is also performed, since mineral oil, a surfactant, and the like are contained as components of the reverse-phase emulsion, adsorption or drainage to excavated soil is performed. There is a risk that mineral oil and surfactant components may flow out and remain in the environment.

[0006] JP-A-4-64625 discloses additives of water-soluble cellulose such as methylcellulose and carboxymethylcellulose which improve the fluidity and breathing of excavated earth and sand. However, since these materials are derivatives of cellulose and have a low molecular weight and rigid molecular chains, the ability of the functional groups present on the surface of the cut sand particles to adsorb water molecules is small, and they exhibit only an effect as a mere dispersant.

The invention described in JP-A-4-85691 relates to an improvement of the invention described in JP-B-63-42077, which uses a dispersion stabilizer such as polyalkylene glycol and soap together with a superabsorbent resin. And also disclosed in JP-A-5-302080.
Japanese Patent Application Laid-Open Publication No. H11-157, proposes to use an acrylamide-acrylate copolymer obtained by reverse-phase emulsion polymerization and having an anionization ratio of 15 to 40 mol% as a lubricant for civil engineering. This anionic polymer flocculant has a high molecular weight of about 10 million or more, and forms a strong crosslink between soil and sand particles during excavation and causes coagulation. It is lost and does not show a sufficient effect of preventing the adhesion of cohesive soil.

Further, Japanese Patent Application Laid-Open No. 3-131400 discloses that a slurry agent containing an acrylic water-soluble polymer having a molecular weight of 1,000,000 or more, silt clay and water is kneaded with earth and sand to form a coagulated mud. Although a characteristic method of agglomerating earth and sand is described, it is not possible to prevent the excavated earth and sand from adhering to the face by using such a method because the purpose is to discharge mud from the apparatus.

An acrylic polymer flocculant is also disclosed in Japanese Patent No. 3044954, JP-A-5-7706, JP-A-2-94890, JP-A-2-94891, JP-A-2-107400 and the like. Although it is disclosed to be used, the purpose of use is different from that of the present invention, and the object of the present invention cannot be achieved with such a polymer flocculant. Under such circumstances, there is a strong demand for an effective adhesive agent for preventing the adhesion of excavated earth to the face of an excavator.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present inventors have made a material which does not affect the environment, has good wettability to the face of an excavator, and forms a weak bridge between soil particles. After extensive research on materials that reduce the friction between the excavator's face and the earth and sand by means of a moisture adsorption layer of a hydrophilic functional group of a polymer adsorbed on the surface of the earth and sand particles, the present invention described in detail below was completed. It was done.

[0011]

That is, the present invention relates to an adhesive agent for preventing the adhesion of soil to civil engineering, comprising a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof dispersed in an aqueous solution of an inorganic salt. Hereinafter, referred to as “adhesion inhibitor”).

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The anti-adhesion agent of the present invention comprises W / (meth) acrylamide and a copolymer of (meth) acrylic acid or a salt thereof.
W-type suspension (meaning that the copolymer is in a dispersed or suspended state), that is, in an aqueous solution of an inorganic salt having a moderate concentration,
Polymer electrolytes (meth) acrylamide and (meth)
This is an aqueous solution in which a copolymer of acrylic acid or a salt thereof is dispersed and suspended. The molecular weight of the copolymer is in the range of 500,000 to 6,000,000, more preferably 1.5 to 5,000,000. If the molecular weight is less than 500,000, the copolymer suspension does not exhibit the necessary spinnability, weak crosslinks are formed between the soil and sand particles, and uniform adsorption of polymer chains to the particle surface is not formed. Moisture is not induced on the surface, which makes it difficult to prevent sediment adhesion on the face. On the other hand, if the molecular weight exceeds 6 million, strong crosslinks are formed between the sediment particles, and the moisture adsorption layer on the surface of the sediment particles is reduced, which not only reduces the anti-adhesion effect but also causes solid-liquid separation and excavation. The fluidity of the earth and sand is lost, and the earth removal work becomes extremely difficult.

In the present invention, the molecular weight is calculated from the intrinsic viscosity in a 1N aqueous solution of sodium nitrate at 30 ° C. [η] = 3.73 × 10 ⁻⁴ × MW ^0.66 (MW Is the molecular weight) and is expressed as a viscosity average molecular weight.

The viscosity of the anti-adhesion agent of the present invention is preferably 10,000 mPa · s or less, and if it exceeds 10,000 mPa · s, the fluidity of the solution itself is reduced. It takes time to dissolve. Preferably 10 to 5000 mPas
It is.

The (meth) acrylic acid unit content in the copolymer is 0.1 to 50 mol%, particularly preferably 5 to 40 mol%.
It is. That is, when the content of the (meth) acrylic acid unit is less than 0.1 mol%, the water molecule-adsorbing ability of the copolymer decreases, and sufficient water is not induced on the surface of the earth and sand particles, thereby preventing the adhesion of the earth and sand on the face. It will be difficult to do. On the other hand, if it exceeds 50 mol%, not only is the adhesion prevention effect insufficient due to an increase in tackiness, but also the copolymer suspension in the inorganic salt aqueous solution becomes insufficient, and during storage and storage, It thickens and gels to cause solid-liquid separation, losing its function as an anti-adhesion agent.

The adhesion inhibitor of the present invention, that is, the copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof suspended in an aqueous solution of an inorganic salt is disclosed, for example, in JP-A-10-19511.
It can be produced by the method described in JP-A No. 6 and the like.
For example, in a reaction vessel equipped with a stirrer, a thermometer, a nitrogen inlet pipe and a cooling pipe, a predetermined amount of (meth) acrylamide and 0.1 to 50 mol% of (meth) Acrylic acid or a salt thereof, for example, a copolymerizable anionic monomer such as an alkali metal salt or an ammonium salt, and a copolymer of polyvinylpyrrolidone or vinylpyrrolidone and another monomer are converted into an aqueous solution of an inorganic salt such as a sulfate. And a polymerization initiator such as potassium persulfate or ammonium persulfate and a chain transfer agent such as isopropyl alcohol are added under nitrogen gas introduction, followed by polymerization at a predetermined temperature. A copolymer having a desired molecular weight can be easily produced by adjusting the addition amount of a polymerization catalyst, polymerization temperature, temperature control after polymerization, the addition amount of a chain transfer agent, and the like.

As for the copolymer of vinylpyrrolidone, monomers copolymerizable with vinylpyrrolidone include, for example, vinyl acetate, styrene and ethyl acrylate. As long as there is a vinylpyrrolidone unit skeleton that forms a weak hydrogen bond with the amide group of the above, there is no particular limitation to these monomers.

Next, the salt concentration in the aqueous solution of the inorganic salt during the polymerization of the copolymer is 25 to 40% by weight, especially 30 to 35% by weight.
Is preferred. Examples of inorganic salts include, but are not limited to, ammonium sulfate, sodium sulfate, magnesium sulfate, ammonium monohydrogen phosphate, sodium nitrate, potassium chloride, sodium chloride, and the like.
The inorganic salts described in JP-A-10-195116 can be used. As for the polymerization temperature, it is 15 to 50 ° C, more preferably 20 to 30 ° C. The reaction time varies depending on the reaction volume, but is generally about 2 to 20 hours. The copolymer of the present invention may contain a small amount of another copolymer component as long as the object of the present invention is not impaired. Examples of such a copolymer component include acrylamide derivatives such as dimethylacrylamide, (meth) acrylic acid derivatives such as ethyl (meth) acrylate, (meth) acryloyloxyethyltrimethylammonium chloride, (meth) acryloyloxyethyldimethylammonium chloride and the like. Salts and the like can be exemplified.

The W / W suspension comprising the copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof of the present invention thus produced, that is, a copolymer suspended in an aqueous solution of an inorganic salt. Is a low-viscosity liquid having fluidity and maintains fluidity for a long period of time. And since this anti-adhesion agent is a low-viscosity liquid in which the produced copolymer fine particles are suspended, unlike the conventional water-soluble polymer powder used in the shield method, it can be added to water in an extremely short time. Not only can it be dissolved,
It has the feature of excellent workability.

Next, as to the method of using the anti-adhesion agent of the present invention, for example, a W / W type comprising a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof produced by the above-mentioned method. When used, the suspension is used after being diluted with water to a copolymer concentration of approximately 0.01 to 0.9% by weight. The anti-adhesion agent of the present invention diluted with water is sprayed continuously or intermittently toward the excavated soil layer from a plurality of holes provided on the face. The sprayed anti-adhesion agent pseudo-aggregates the excavated earth and sand particles to prevent the excavated earth and sand from adhering to the face. In order to further enhance the effects of the present invention, it is desirable to spray the copolymer aqueous solution of the present invention not only on the excavated soil layer but also on the face. In this way, by preventing the excavated soil from adhering to the face, the propulsion of the shield excavator can be made smooth and stable, and the excavated sediment from the excavator chamber can be remarkably easily discharged.

The anti-adhesion agent of the present invention has a molecular weight in a specific range, and the amide group bonded to the main chain of the copolymer adsorbs and cross-links the sediment particles, causing the particles to coagulate and to the surface of the coagulated particle aggregate. Adsorption of water molecules of the carboxyl group, which is the hydrophilic functional group of the copolymer, and the amide group, which did not participate in the particle adsorption, on the surface of the particle aggregate and the absorption of water into the viscous particle aggregate by coexisting salts By the suppression, water molecules are adsorbed on the surface of the particle aggregate to form a thin film layer of water. Since this thin film layer acts as a kind of mold release agent, it prevents the excavated earth and sand from adhering to the face. That is, the copolymer of the present invention,
It aggregates excavated sediment particles with mild cohesive force instead of strong cohesive force like a commercially available polymer flocculant, and induces water in excavated sediment on the surface of the aggregated particles by the joint action of this and salts. It is estimated to be.

When a small amount of guar gum and / or xanthan gum is added to the aqueous copolymer solution of the present invention, the adhesion preventing effect of the present invention can be further enhanced. That is, guar gum or xanthan gum is a polysaccharide having a branched structure, and has a characteristic that, due to its high rigid molecular structure, shrinkage of the molecular chain hardly occurs even in an inorganic salt aqueous solution. However, these gums have a molecular weight of about 200,000 to 1,000,000, and furthermore, because of the reduced cohesive force of earth and sand particles due to the branched structure, an effective adhesion preventing effect cannot be obtained by using the gum alone. The present inventors have clarified that the use of guar gum and / or xanthan gum makes it possible to control the amount of water absorption according to the properties of excavated earth and sand, and increases the adhesion prevention effect of the aqueous copolymer solution. Furthermore, when guar gum and xanthan gum are used at the same time, a partial intermolecular cross-link occurs in the molecular chains of both to form a network, so that the thin film layer of water molecules formed on the surface of the sediment-particle aggregate is reinforced to maintain water absorption. Show the effect. The amount of addition is 0. 0 to the weight of the copolymer.
5 to 5 times is preferred.

Further, the anti-adhesion agent of the present invention comprises a conventional W /
Unlike the thickener of the O-type emulsion, since an inorganic salt aqueous solution is used as a dispersion medium, it has excellent features such as a small influence on the environment such as an outflow of oil from excavated earth and sand and groundwater.

Next, the present invention will be further described with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. In the present invention, the term “anionization ratio” means the content (mol%) of (meth) acrylic acid units in the copolymer, and all other percentages indicate weight% unless otherwise specified.

[0025]

EXAMPLES (Example 1) Stirrer, nitrogen inlet tube, thermometer,
Acrylamide 4 was added to a 500 mL reaction vessel equipped with a reflux condenser.
5.1 g, sodium acrylate 14.9 g, polyvinylpyrrolidone (molecular weight = 10,000) 6.0 g, propylene glycol monomethyl ether 0.5 g were added, dissolved in ion-exchanged water 206.2 mL, further ammonium sulfate 121.5 g, sodium sulfate
3.8 g was dissolved. After removing dissolved oxygen by introducing nitrogen, 150 mg of potassium persulfate was added, and polymerization was performed at 25 ° C. for 5 hours with stirring. Stop stirring, allow to stand at 25 ° C. for 15 hours under a nitrogen atmosphere, add 6.0 g of sodium bisulfite and stir for 10 minutes,
A suspension of an acrylic acid-acrylamide copolymer having an anionization ratio of 20 mol% was obtained. The viscosity of this suspension is 300m at 25 ° C
Pa · s. Further, a 0.5% aqueous solution of the formed copolymer was precipitated in methanol and dried at room temperature under vacuum, and the viscosity average molecular weight was 2.7 million.

[0026] was drilled while injecting an aqueous solution prepared by diluting the copolymer suspension approximately 30-fold (15 m ³ relative excavated soil 1 m ³⁾ from the tip of the excavator to silt clay layer. As a result, the excavated soil particles were able to be smoothly excavated and the excavated soil was discharged without hardly attaching to the face of the excavator.

Example 2 In a 500 mL reaction vessel equipped with a stirrer, a nitrogen inlet tube, a thermometer, and a reflux condenser, 45.1 g of acrylamide, 14.9 g of sodium acrylate, 6.0 g of polyvinylpyrrolidone (molecular weight = 20,000), propylene Glycol monomethyl ether 0.5 g, isopropyl alcohol 0.
4 g was added and dissolved in 202.2 mL of ion-exchanged water, and further, 121.5 g of ammonium sulfate and 3.8 g of sodium sulfate were further dissolved.
After introducing nitrogen, add 30 mg of potassium persulfate and stir at 25 ° C.
After stirring polymerization for 7 hours, 6.0 g of sodium hydrogen sulfite was added and 1
After stirring for 0 minutes, acrylic acid having an anionization ratio of 20 mol%
A suspension of the acrylamide copolymer was obtained. The viscosity of this suspension was 500 mPa · s at 25 ° C. The viscosity average molecular weight of the produced copolymer was 5.7 million.

[0028] was drilled while injection into loam an aqueous solution prepared by diluting the copolymer suspension approximately 30-fold (15 m ³ relative excavated soil 1 m ³⁾ from the tip of the excavator. As a result, the excavated soil particles were able to be smoothly excavated and the excavated soil was discharged without hardly attaching to the face of the excavator.

Example 3 In a 500 mL reaction vessel equipped with a stirrer, a nitrogen inlet tube, a thermometer, and a reflux condenser, 32.0 g of acrylamide, 28.0 g of sodium acrylate, 8.0 g of polyvinylpyrrolidone (molecular weight = 10,000), propylene Add 0.5 g of glycol monomethyl ether, and add 262.0 m of ion-exchanged water.
L, and further dissolved by adding 158.0 g of ammonium sulfate and 5.0 g of sodium sulfate. After the introduction of nitrogen, potassium persulfate (30 mg) was added, and the mixture was stirred and stirred at 25 ° C for 1.5 hours.
Further, 1000 mg of potassium persulfate was added, and stirring was continued for 2.5 hours. Thereafter, stirring was stopped and the mixture was allowed to stand at 25 ° C. for 13 hours in a nitrogen atmosphere. Then, 6.0 g of sodium bisulfite was added, and the mixture was stirred for 30 minutes to obtain a suspension of an acrylic acid-acrylamide copolymer having an anionization ratio of 40 mol%. I got The viscosity of this suspension is 25 ° C
Was 1000 mPa · s. The viscosity average molecular weight of the produced copolymer was 2.1 million.

[0030] was drilled while injecting an aqueous solution prepared by diluting the copolymer suspension approximately 30-fold (30 m ³ relative excavated soil 1 m ³⁾ from the tip of the excavator to silt clay layer. As a result, the excavated soil particles were able to be smoothly excavated and the excavated soil was discharged without hardly attaching to the face of the excavator.

Example 4 In a 500 mL reaction vessel equipped with a stirrer, a nitrogen inlet tube, a thermometer and a reflux condenser, 45.1 g of acrylamide, 14.9 g of sodium acrylate, 6.0 g of polyvinylpyrrolidone (molecular weight = 10,000), propylene Glycol monomethyl ether 0.5 g, isopropyl alcohol 4.
0 g, ion exchange water 202.2 mL, ammonium sulfate 121.5 g,
A solution was prepared using 3.8 g of sodium sulfate. After removing dissolved oxygen by introducing nitrogen, potassium persulfate (30 mg) was added, and the mixture was stirred and polymerized with stirring at 25 ° C for 7 hours.Sodium bisulfite (6.0 g) was added, and the mixture was further reacted for 50 minutes, and the anionization rate was increased.
A suspension of 20 mol% acrylic acid-acrylamide copolymer was obtained. The viscosity of this suspension was 640 mPa · s at 25 ° C. The viscosity average molecular weight of the produced copolymer was 600,000.

[0032] was drilled while injecting an aqueous solution prepared by diluting the copolymer suspension approximately 30-fold (20 m ³ relative excavated soil 1 m ³⁾ from the tip of the excavator to silt clay layer. As a result, the excavated soil particles were able to be smoothly excavated and the excavated soil was discharged without hardly attaching to the face of the excavator.

Example 5 An acrylic acid-acrylamide copolymer suspension having an anionization ratio of 20 mol% and a molecular weight of 2.7 million was obtained by the production method described in Example 1. Gua gum was added to and dissolved in an aqueous solution obtained by diluting the copolymer suspension about 30-fold so as to have a concentration of 0.5%. The aqueous solution (excavated soil 1m ³ for 2
0m ³ ) was excavated by injecting into the silt clay layer from the tip of the excavator. As a result, the excavated soil particles were able to be smoothly excavated and the excavated soil was discharged without hardly attaching to the face of the excavator.

Example 6 An acrylic acid-acrylamide copolymer suspension having an anionization ratio of 20 mol% and a molecular weight of 2.7 million was obtained by the production method described in Example 1. Xanthan gum was added to and dissolved in an aqueous solution obtained by diluting the copolymer suspension about 30-fold so that the concentration became 0.3%. The aqueous solution (20 m ³ relative excavated soil 1 m ^3), was subjected to drilling while injection into silt clay layer from the tip of the excavator. As a result, the excavated earth and sand particles hardly adhere to the face of the excavator,
The excavation was performed smoothly and the excavated soil was discharged.

Example 7 An acrylic acid-acrylamide copolymer suspension having an anionization ratio of 20 mol% and a molecular weight of 5.7 million was obtained by the production method described in Example 2. Gua gum and xanthan gum were added to and dissolved in an aqueous solution obtained by diluting the copolymer suspension about 30-fold so that the concentration was 0.2% each. The aqueous solution (6 m ³ to excavated soil 1 m ^3), was subjected to drilling while injection into loam from the tip of the excavator. As a result, the excavated soil was able to be smoothly excavated and the excavated soil was discharged, with almost no excavated earth and sand particles adhering to the face of the excavator.

Comparative Example 1 Polymerization was carried out under the same conditions as in Example 1 except that the amount of potassium persulfate was changed to 30 mg.
An acrylic acid-acrylamide copolymer suspension having an anionization ratio of 20 mol% was obtained. An aqueous solution prepared by diluting the copolymer suspension approximately 30-fold (20 m ³ relative excavated soil 1 m ^3), was drilled while injection into silt clay layer from the tip of the excavator. As a result, the excavated earth and sand particles aggregated to form flocs, solid-liquid separated, and adhered to the excavator face in large quantities.
There was no smooth excavation and no earth removal.

(Comparative Example 2) Isopropyl alcohol was added to 8.
Polymerization was carried out under the same conditions as in Example 4 except that the amount was 0 g,
An acrylic acid-acrylamide copolymer suspension having a molecular weight of 300,000 and an anionization ratio of 20 mol% was obtained. To this copolymer solution suspension was diluted about 30-fold (excavated soil 1 m ³ 20
m ³ ) was excavated while injecting from the tip of the excavator machine and into the loam layer. As a result, the sediment particles adhered to the face of the excavator, and the workability of discharging the earth was significantly reduced.

[0038]

The adhesive-soil-adhering agent for civil engineering according to the present invention has a spinnability comprising a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof suspended in an aqueous solution of an inorganic salt. It is a low-viscosity W / W-type suspension, which forms a weak bridge between excavated earth and sand and pseudo-agglomerates the excavated earth and sand, and adsorbs water molecules on the surface of the aggregated particle aggregate to form a thin film layer of water. The presence of the salt suppresses the excessive water absorption on the surface, and shows an optimum adhesion preventing effect. Furthermore, when a small amount of guar gum and / or xanthan gum is added to the copolymer solution, the amount of water adsorbed on the aggregated particle aggregate surface is appropriately increased, and the adhesion preventing effect is also increased.

Therefore, when the adhesive for preventing the adhesion of soil of civil engineering of the present invention is sprayed on the excavated soil layer, the adhesion of excavated earth and sand to the face of the shield method excavator can be effectively prevented. The propulsion of the excavator is smooth and stabilized, and the sediment discharge from the excavator chamber is stabilized and facilitated. In order to further enhance the effect of the present invention, it is necessary to simultaneously spray the face. Furthermore, since the adhesive for soil adhesion prevention for civil engineering of the present invention is a W / W suspension, it can be very easily dissolved in water. In addition, unlike the conventional W / O emulsion used as a lubricant for civil engineering and the like, the anti-adhesive agent for civil engineering soil of the present invention does not contain an organic solvent such as hydrocarbon and is environmentally friendly. It has many industrial significances, such as low impact on the environment and high safety.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B01D 21/01 107 B01D 21/01 107 C02F 1/56 C02F 1/56 B C09K 103: 00 C09K 103 : 00 109: 00 109: 00 (71) Applicant 000203656 Taki Chemical Co., Ltd. 2 Midoricho, Beppu-cho, Kakogawa-shi, Hyogo (72) Inventor Yukihiro Akioka 1-13-18 Sugawara, Higashiyodogawa-ku, Osaka-shi, Osaka (72) Inventor Hideo Hagiwara Ina 845-3, Ina 845-3, Akiruno-shi, Tokyo (72) Inventor Masato Fujikake 1 Irifune-cho, Shima-ku, Himeji-shi, Hyogo Sumitomo Seika Chemicals Co., Ltd.Functional Resin Research Institute (72) Inventor Nobutaka Fujimoto Himeji-shi, Hyogo No. 1 Irifune-cho, Shikuma-ku Sumitomo Seika Co., Ltd. Functional Plastics Research Laboratory (72) Inventor Kenji Fujimoto 925-2-1026 Yoneda, Yoneda-cho, Takasago-shi, Hyogo (72) Inventor Konishi Tsuyoshi 1046-2, Kano-cho, Nishiwaki-shi, Hyogo Prefecture (72) Inventor Osamu Yagyu 462-120, Ishimori, Kamino-cho, Kakogawa-shi, Hyogo (72) Inventor Yukari Imamura 4-2-22, Higashi-Imajuku, Himeji-shi, Hyogo (72) Inventor Takao Okada, Hyogo 2081-5 New Residence, Kakogawa, F-term (Reference) 2D054 AC01 AC18 CA09 DA39 4D015 BA06 BB06 CA10 DB03 DB07 DB13 DB33 4D062 BA06 BB06 CA10 DB03 DB07 DB13 DB33 4H026 CB08 CC06

Claims (5)

[Claims] 1. An adhesive preventive agent for civil engineering works comprising a copolymer of (meth) acrylamide and (meth) acrylic acid or a salt thereof dispersed in an aqueous solution of an inorganic salt. 2. The method according to claim 1, wherein the molecular weight of the copolymer is from 500,000 to 6,000,000. 3. The adhesive soil adhesion inhibitor according to claim 1, wherein the content of the (meth) acrylic acid unit in the copolymer is 0.1 to 50 mol%. 4. The adhesive preventive agent for civil engineering soil according to claim 1, further comprising guar gum and / or xanthan gum. 5. The viscosity-adhering agent for civil engineering according to claim 4, wherein the content of guar gum and / or xanthan gum is 0.5 to 5 times the weight of the copolymer.