JP2002322647A - Hot-melt type finishing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finishing agent capable of omitting a drying time for improving workability and safety of work and available as a hydraulic admixture adhesion inhibitor, a friction reducing agent, a soil adhesion preventing agent, or a water sealing agent. SOLUTION: This finishing agent contains a water absorbing resin (a) and a hot-melt binder resin b as essential components and produces 10 wt.% or less of a volatile component by heating at 180 deg.C for 10 minutes. In use of this finishing agent as the hydraulic admixture adhesion inhibitor, the finishing agent is applied to a base material surface for reducing adhesion between the base material surface and a hydraulic admixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a surface treatment agent. More specifically, the present invention relates to a surface treatment agent used as a hydraulic admixture adhesion inhibitor, a friction reducing agent, a soil adhesion inhibitor, or a water stopping agent.

[0002]

2. Description of the Related Art In a construction work such as a construction field and a civil engineering field, since the construction, equipment, cost, and days are required for the construction, it is necessary to control the construction efficiently and to bury the ground. When the substructure is damaged, a great deal of labor is required for repairing the substructure, and it has been desired to suppress the occurrence of such a problem. If these can be improved, it will be possible to reduce the cost of foundation work and the like and to complete the work quickly.

[0003] In such a foundation construction, for example, in a construction involving construction of a ground foundation structure such as an earth retaining wall composed of at least a buried object such as an H-section steel and a hydraulic admixture, a ground work is required. There has been a problem that the efficiency of the construction is reduced due to the adhesion of the surface of the base material such as the substructure to the hydraulic admixture. In the substructure, the buried material such as H-section steel is embedded in concrete hydrate etc.
The shaped steel will be pulled out of the concrete hydrate so as not to hinder other underground works after completion of the work and to be reused. At this time, since the H-shaped steel and the concrete hydrate are strongly bonded,
The efficiency of the construction will be reduced by the work of pulling out the mold steel.

[0004] In the construction of tanks, water storage tanks, fume pipes, steel pipes, steel pipe piles and the like in the submersion method and the propulsion method for burying underground, the foundation structure is soiled by earth pressure and friction with soil. There were various problems such as difficulty in sinking and pushing in. The substructure buried underground by these various constructions also has a problem such as damage due to friction (negative friction) between the surface of the substructure and the surrounding ground.

Further, in the construction using temporary steel materials such as steel sheet piles and the like often used in the underground excavation using the retaining wall and the burying method of the foundation structure, soil adheres in the drawing and collection work after the completion of the construction. Therefore, temporary collection after collection is difficult because it cannot be piled up in parallel after collection, and temporary steel materials must be reused after collection. There was a problem that it was necessary to pay for the cleaning of the temporary steel material when returning it to the dealer.

[0006] In the construction using a steel sheet pile continuous wall used as a temporary retaining wall for temporary construction of underground buried works, a secondary protective wall of an industrial waste disposal site, etc., it is relatively difficult to install a continuous wall. Although it is simple, for example, a steel sheet pile joint part for efficiently constructing a steel sheet pile continuous wall is inevitably several mm in length.
Since a gap of about 1 or 2 cm is left, there is a problem that water and liquid leak from the joint.

Various studies have been made on such problems. For example, Japanese Patent Publication No. 5-19612 discloses a rewetting lubricating layer in which a water-absorbing polymer and a rewetting binder are kneaded and dried and solidified as a technique for facilitating pulling out of a pile from cement. As a technique for reducing the frictional force between bentonite mortar and ground and steel, JP-A-63-165615 discloses that a film is formed by applying a volatile film-forming resin and a highly water-absorbing resin. Have been. Further, as a technique for reducing the frictional force between the ground and a foundation such as a pile, Japanese Patent Application Laid-Open No. 58-191816 discloses, in Examples, a water-absorbing swellable resin and a resin solution such as polyvinyl alcohol or polypropylene glycol. Disclosed is a dispersion mixed with a non-aqueous liquid.
No. 27619 discloses a water-swellable paint in which polyvinyl butyral and gelatin or agar fine powder are mixed in Examples and alcohol is used as a solvent.

As a technique for preventing water leakage from a joint of a steel sheet pile, Japanese Patent Publication No. 4-25990 discloses a specific NC.
A coating agent using an O-terminal urethane prepolymer is disclosed. Japanese Patent Publication No. 6-96888 discloses an ionizing water-absorbing polymer,
A water-swellable coating composition comprising an organic solvent solution of a polyvalent metal compound and an elastomer is disclosed in JP-A-2-2066.
No. 20 discloses a strip-shaped water-swellable substance which is obtained by applying an organic solvent solution of a superabsorbent polymer and a thermoplastic elastomer to a release paper and drying it, and which is bonded to a steel sheet pile joint.

In these techniques, the water-absorbent resin is attached to the surface of the base material. For example, the water-absorbent resin swells before the cement hardens and displaces the cement from the surface of the base material. Since water gradually disappears, the swollen water-absorbing resin shrinks, and a gap is formed between the hardened cement and the surface of the base material, thereby suppressing adhesion to the cement. In addition, when the base material is embedded in the ground or after being embedded, the water-absorbent resin swells and separates, thereby reducing friction with the ground, and swelling the water-absorbent resin to prevent water leakage from the steel sheet pile joint. Or to prevent it.

[0010] However, when a water-absorbing resin or a binder is applied, a solvent containing a solvent or water is used, but it takes time until the solvent is dried. Therefore, there is room for contriving to improve the workability by shortening the construction time. In addition, there is room for a device that can be constructed without using a solvent, eliminating dangers such as flammability and toxicity, and improving safety in construction on site. Further, conventionally, there has been no effective technique capable of suppressing the adhesion between the base material surface and the ground (soil).

Japanese Patent Application Laid-Open No. H11-241339 discloses a surface treating agent containing a water-swellable resin and an alkali water-soluble resin having an acid value of 15 mgKOH / g or more. By using this surface treatment agent, it is possible to suppress the adhesion between the substrate surface and the hydraulic admixture and to improve the efficiency of foundation work, etc., but to shorten the construction time and improve the workability There is room for contriving to expand the range of applications by making it adaptable to applications that require the use of a solvent or applications where the use of solvents is restricted.

[0012]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention improves the workability by eliminating the need for a drying time,
An object of the present invention is to provide a surface treatment agent that can be used as a hydraulic admixture adhesion inhibitor, a friction reducing agent, a soil adhesion inhibitor, or a water stopping agent, which can improve safety in work.

[0013]

Means for Solving the Problems The inventors of the present invention applied a surface which can be used as a hydraulic admixture adhesion inhibitor, a friction reducing agent, a soil adhesion inhibitor or a water blocking agent by applying to a substrate surface. In examining the treatment agent, first focusing on the fact that when the water-absorbent resin (a) and the hot melt binder resin (b) are combined, they can be appropriately used for these applications. I came up with an idea that I could solve the problem brilliantly. In addition, it has been found that, when the working conditions are specified for such a surface treatment agent, the workability is improved and the function and effect are more reliably exhibited, and the present invention has been achieved.

That is, the present invention comprises a water-absorbent resin (a) and a hot-melt binder resin (b) as essential components.
10% by weight of volatile components when heated at 80 ° C for 10 minutes
A surface treating agent that is used as a hydraulic admixture adhesion inhibitor that, when applied to the substrate surface, suppresses adhesion between the substrate surface and the hydraulic admixture.

The present invention also comprises a water-absorbent resin (a) and a hot melt binder resin (b) as essential components,
A surface treating agent having a volatile component of less than 10% by weight when heated at 10 ° C. for 10 minutes, and applied to the surface of a base material to reduce friction between the base material surface and the ground (soil). It is also a surface treatment agent used as a reducing agent.

The present invention further comprises a water absorbing resin (a) and a hot melt binder resin (b) as essential components,
A surface treating agent having a volatile component of less than 10% by weight when heated at 10 ° C. for 10 minutes, and applied to the surface of a base material to suppress adhesion between the base material surface and the ground (soil). It is also a surface treatment agent used as an adhesion inhibitor.

The present invention comprises a water-absorbent resin (a) and a hot-melt binder resin (b) as essential components,
A water-stopping agent that has a volatile component of less than 10% by weight when heated at 0 ° C. for 10 minutes and is applied to the surface of the base material to fill gaps between the surfaces of the base material and stop water. It is also the surface treatment agent used. Hereinafter, the present invention will be described in detail.

The surface treatment agent of the present invention exerts the following effects (1) to (4) by being applied to the surface of a substrate to form a surface treatment layer (coating film). That is, (1) when the water-absorbent resin (a) exhibits a function of absorbing water and swelling and is used as a hydraulic admixture adhesion inhibitor, it swells by absorbing water (alkali water) in the hydraulic admixture. Since the water-absorbent resin (a) swollen as the hydraulic mixture hydrates is dried and shrunk, and a gap can be formed between the surface of the substrate and the hydraulic mixture, the surface of the substrate and the water It is possible to suppress adhesion between the hard mixture and its hydrate (cured product). In addition, when used as a friction reducing agent or soil adhesion preventive, when the substrate is buried in the ground, the surface of the substrate and the surface-treated layer are in close contact with each other, and are prevented from peeling during casting, and when the substrate is left on the ground The lubricating gel layer is formed by absorbing and swelling the moisture in the ground (soil), and the lubricating gel layer functions as a lubricant when the base material is pulled out or moves on the ground, and peels off from the base material surface and enters the ground together with the soil. Since it remains, the frictional force between the base material surface and the ground (soil) is reduced, and it becomes possible to suppress the adhesion of the soil. Further, when used as a water-stopping agent, when a base material such as steel sheet pile is cast into a steel sheet pile continuous wall or the like, the surface treatment layer absorbs water in the ground (soil) and swells. It is possible to fill the gap in the joint part between them and stop water. In the present invention, the surface treatment agent comprises the water-absorbent resin (a) and the hot melt binder resin (b) as essential components, and the volatile component when heated at 180 ° C. for 10 minutes is 10% by weight or less. When the agent is applied (coated), drying time is not required, thereby improving workability and improving safety in work. When the surface treatment agent is applied to the surface of the base material, a cooling time for the hot melt binder resin (b) is required, but the cooling time is shorter than the drying time when a solvent is used. In addition, it is possible to improve the workability by shortening the work time for applying the surface treatment agent.

(2) Hot melt binder resin (b)
As, when applied to the substrate surface and dried, the adhesive force to the substrate surface is large, and when wet, by using a material having a reduced adhesive force, for example, the substrate can be placed in the ground. When buried in, for example, the surface treatment layer is prevented from peeling off during drying, and also forms a lubricating gel layer when wet, and the lubricating gel layer has a reduced adhesion and is easily peeled off. When the surface treatment agent is used as a hydraulic admixture adhesion inhibitor, a friction reducing agent, or a soil adhesion inhibitor, the friction and adhesion with the ground (soil) can be more reliably prevented. The function and effect can be sufficiently exhibited.

(3) When the surface treatment layer is set so as to have high adhesion to the substrate surface but not high strength, it is possible to minimize peeling of the surface treatment layer due to a large scratching force. it can.

(4) By utilizing the water-resistance imparting layer as the top coat, the adhesion of the surface-treated layer when the substrate is cast (prevention of peeling) and the water-absorbing resin (a) are applied to the ground (soil)
Water absorption and swelling due to the water content therein can be more sufficiently compatible.

The essential components of the surface treating agent of the present invention will be described below. The water-absorbing resin (a) constituting the surface treatment agent of the present invention is not particularly limited as long as it is a resin which swells by absorbing water and has a water absorption ratio of ion exchange water to its own weight of 3 times or more. is not.

As the water-absorbent resin (a), for example,
Cross-linked poly (meth) acrylic acid, cross-linked poly (meth) acrylate, cross-linked poly (meth) acrylate having a sulfonic acid group, cross-linked poly (meth) acrylate having a polyoxyalkylene group, Poly (meta)
Crosslinked acrylamide, crosslinked copolymer of (meth) acrylate and (meth) acrylamide, crosslinked copolymer of hydroxyalkyl (meth) acrylate and (meth) acrylate, crosslinked polydioxolane, crosslinked poly Ethylene oxide, cross-linked polyvinyl pyrrolidone, cross-linked sulfonated polystyrene, cross-linked polyvinyl pyridine, saponified starch-poly (meth) acrylonitrile graft copolymer, starch-poly (meth) acrylic acid (salt) graft cross-linked copolymer, polyvinyl alcohol Reaction products of carboxylic acid and maleic anhydride (salt), crosslinked polyvinyl alcohol sulfonate, polyvinyl alcohol-acrylic acid graft copolymer, polyisobutylene maleic acid (salt) crosslinked polymer and the like. These may be used alone,
Two or more kinds may be used in combination.

The preferred form of the water absorbing resin (a) is a water absorbing resin having a nonionic group and / or a sulfonic acid (salt) group, and more preferably a water absorbing resin having an amide group or a hydroxyalkyl group. And a cross-linked copolymer of (meth) acrylate and (meth) acrylamide, and a cross-linked copolymer of hydroxyalkyl (meth) acrylate and (meth) acrylate. be able to. Further, as a particularly preferred embodiment, a water-absorbing resin having a polyoxyalkylene group can be mentioned, for example, a copolymerized crosslinked product of a (meth) acrylate and a (meth) acrylate having a methoxypolyoxyalkylene group, and the like. Can be exemplified. In these embodiments, the water absorbency with respect to alkaline water is improved, but the water-absorbent resin having a methoxypolyoxyalkylene group is particularly excellent.

The water-absorbing resin (a) may be a resin obtained by polymerizing a water-soluble ethylenically unsaturated monomer and, if necessary, a monomer component containing a crosslinking agent. Can be. In this case, the water-absorbent resin (a) is preferable because it has excellent water absorbency with water and is generally inexpensive. The ethylenically unsaturated monomer that forms such a water-absorbent resin and the crosslinking agent used as necessary are not particularly limited, and examples of the ethylenically unsaturated monomer include the following. One or more of the following monomers.

(Meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, citraconic acid, vinylsulfonic acid, (meth) allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, 2 −
(Meth) acryloylethanesulfonic acid, 2- (meth)
Acryloylpropanesulfonic acid and alkali metal salts and ammonium salts of these monomers; N, N-dimethylaminoethyl (meth) acrylate and its quaternary products; (meth) acrylamide, N, N-dimethyl (meth) ) Acrylamide, 2-hydroxyethyl (meth) acrylamide, diacetone (meth) acrylamide, N
-(Meth) acrylamides such as isopropyl (meth) acrylamide and (meth) acryloylmorpholine, and derivatives of these monomers; hydroxyalkyl such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate (Meth) acrylates; polyalkylene glycol mono (meth) acrylates such as polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, methoxypolyethylene glycol mono (meth) acrylate, and methoxypolypropylene glycol mono (meth) acrylate; N -Vinyl-2-pyrrolidone,
N-vinyl monomers such as N-vinyl succinimide;
N-vinylamide monomers such as vinylformamide, N-vinyl-N-methylformamide, N-vinylacetamide, N-vinyl-N-methylacetamide; vinyl methyl ether and the like.

The preferred form of the ethylenically unsaturated monomer is a nonionic group and / or a sulfonic acid (salt).
And an ethylenically unsaturated monomer having a group, for example, 2- (meth) acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2- (meth) acryloylpropanesulfonic acid,
(Meth) acrylamide, hydroxyalkyl (meth)
Acrylate, methoxypolyethylene glycol mono (meth) acrylate and the like can be exemplified. In addition, a particularly preferred embodiment includes an ethylenically unsaturated monomer having a polyoxyalkylene group. When the ethylenically unsaturated monomer in these forms is used, the water absorption of the water-absorbent resin (a) with respect to alkaline water is improved, but it is particularly preferable to use methoxypolyethylene glycol mono (meth) acrylate.

When two or more ethylenically unsaturated monomers are used in combination as the monomer component forming the water-absorbent resin (a), the total amount of the monomer components forming the water-absorbent resin (a) is 100%. It is preferable that the proportion of the ethylenically unsaturated monomer having a nonionic group and / or sulfonic acid (salt) group is 1% by weight or more based on the weight%. When the amount is less than 1% by weight, the effect of water absorption due to the formation of an ethylenically unsaturated monomer having a nonionic group and / or a sulfonic acid (salt) group may be reduced. More preferably, it is at least 10% by weight.

The combination when two or more of the above ethylenically unsaturated monomers are used is not particularly limited. For example, a combination of an alkali metal (meth) acrylate such as sodium acrylate and acrylamide, )
A combination of an alkali metal acrylate and methoxypolyethylene glycol mono (meth) acrylate is preferred.

The polymerization method for producing the water-absorbent resin (a) and additives such as an initiator used for the polymerization are not particularly limited, and the polymerization can be carried out by a commonly used method. . The weight-average molecular weight, shape, average particle size, etc. of the water-absorbent resin (a) thus obtained may be appropriately set according to the composition of the surface treatment agent, the pH of the alkaline water, the working environment, etc., and are not particularly limited. Not something. For example, the average particle diameter is preferably 30 to 800 μm. If it exceeds 800 μm, when the water-absorbent resin (a) is mixed with the solvent solution of the binder resin (b), the particles of the water-absorbent resin (a) may easily sink due to excessively large particles. If there,
If the particles of the water-absorbent resin (a) are too small, they may be easily scattered as fine powder, which may make handling difficult. More preferably, it is 30 to 600 μm, and further preferably, it is 30 to 400 μm.

As the hot-melt binder resin (b) constituting the surface treating agent of the present invention, a known hot-melt polymer can be used, and has a binder function of sufficiently adhering the water-absorbent resin (a) to the substrate. It is not particularly limited as long as it has, for example, acrylic polymer, thermoplastic polyurethane, thermoplastic polyester,
Styrene-butadiene-styrene block copolymer (S
BS), styrene-ethylene / butylene-styrene block copolymer (SEBS), styrene-ethylene / propylene-styrene block copolymer (SEPS), styrene-isoprene-styrene (block copolymer (SI
S) and the like, and one or a mixture of two or more of them can be used.

Among them, the hot melt binder resin (b) of the present invention has a high adhesion to a substrate,
Alkaline water-soluble resins are preferred because their coating strength is not very strong. The solubility of the alkaline water-soluble resin in alkaline water is not particularly limited as long as the characteristics of the present invention are not impaired. For example, 0.4% by weight
It is preferable that the resin is soluble in an aqueous solution of NaOH at a concentration and not soluble in neutral or acidic water. Such an alkaline water-soluble resin is not particularly limited as long as it has the above-mentioned solubility. For example, an α, β-unsaturated carboxylic acid monomer and another monomer copolymerizable therewith can be used. And the like.

The solubility of the alkaline water-soluble resin in alkaline water can also be evaluated, for example, by the weight loss rate of the alkaline water-soluble resin in the following solubility test. That is, the solubility of the alkali water-soluble resin in the alkali water, which can be preferably used in the present invention, can be determined, for example, by obtaining a molded product of the alkali water-soluble resin having a shape of 5 mm or less (for example, using a twin-screw extruder. A cylindrical pellet shape of 3 mm in diameter and 3 mm in length as long as it can be formed, even if it is not pelletized, it may be a molded article cut to a size of 5 mm or less) 0.4 g of 10 g % Of NaOH aqueous solution, stirred at 25 ° C. for 24 hours, and can be obtained from the reduction rate of the weight of the alkali water-soluble resin molded body dissolved in alkaline water.

In the above-mentioned solubility test in alkaline water, if any resin remains without being dissolved after stirring for 24 hours, the resin is filtered off, washed with water, and the weight after drying is determined. Then, before being subjected to the solubility test, it can be determined by the rate of decrease from the weight of the original alkali water-soluble resin.
In other words, it can be determined by the ratio of (original weight-weight after solubility test) / (original weight) expressed in%.

The alkali water-soluble resin preferably has a solubility test value in alkaline water of 50 to 100% by weight. More preferably, 60 to 10
0% by weight. More preferably, 70 to 100% by weight
It is.

The alkaline water-soluble resin also includes
It is preferable that the polymer has an acid value of 15 mgKOH / g to 500 mgKOH / g, a weight average molecular weight of 30,000 to 300,000, and a glass transition temperature of -20 to 120 ° C.

The surface treating agent of the present invention contains other additives such as other resins, pigments, various stabilizers, and various fillers, in addition to the above-mentioned essential components, as long as the function and effect are not impaired. May or may not be included. For example,
For the purpose of coloring, a pigment is mixed, or a plasticizer or the like is mixed to adjust the viscosity of the surface treatment agent so that it can be easily determined that the surface treatment layer is formed. Is also good.

The preferred composition of the surface treatment agent of the present invention is such that the water-absorbent resin (a) is 5 to 60% by weight and the hot melt binder resin (b) is 10% by weight based on 100% by weight of the entire surface treatment agent. The content of the water-absorbent resin (a) is 10 to 60% by weight, and the content of the hot-melt binder resin (b) is 30 to 80% by weight, and other additives such as a plasticizer are 0 to 30% by weight. ~ 70 wt%, other additives such as plasticizers are 0-20 wt%.

The volatile component in the surface treating agent of the present invention is 10% by weight based on 100% by weight of the entire surface treating agent when the surface treating agent of the present invention is heated at 180 ° C. for 10 minutes. % Will be set. Accordingly, construction work can be performed safely even in a place where fire may be used nearby, such as a civil engineering work site. The volatile component is preferably less than 5% by weight. More preferably, it is less than 1% by weight.

Although the working temperature and the melt viscosity at the working temperature when the surface treating agent of the present invention is applied are not particularly limited, the simplicity, safety and workability of the equipment used during the working are considered. And when the construction temperature is 120
To 180 ° C., and the melt viscosity at the application temperature is 1.0 × 10 ^{3 to} 5.0 × 10 ⁴ m.
Pa · s is preferable. That is, as one of preferred embodiments of the present invention, when the surface treatment agent is applied, the application temperature is 120 to 180 ° C., and the melt viscosity at the application temperature is 1.0 × 10 ³ to 5.0 × 10
⁴ mPa · s. The application method under the above conditions using the surface treatment agent of the present invention is a preferable embodiment.

If the application temperature is lower than 120 ° C., the application temperature is too low. Therefore, a surface treatment agent which can be applied at this temperature is not preferable because a problem such as too soft at room temperature may occur. If it is more than the above, the thermal stability of the hot melt binder resin (b) may deteriorate, which is not preferable. Further, when the melt viscosity at the working temperature is less than 1.0 × 10 ³ mPa · s,
If the fluidity is too high, liquid dripping may occur and the workability may be reduced. If it exceeds 5.0 × 10 ⁴ mPa · s, the viscosity is too high, the elongation is poor, and the workability (construction sex)
In both cases is not preferable because of the extreme decrease in The working temperature is more preferably 1
20 to 160 ° C, more preferably 120 to 14 ° C.
0 ° C. Further, the melt viscosity is more preferably 2.0 × 10 ^{3 to} 1.0 × 10 ⁴ mPa · s, and still more preferably 3.0 × 10 ^{3 to} 5.0 × 10 ^3.
mPa · s.

The surface-treating agent of the present invention forms a surface-treated layer by being applied to the surface of a substrate, and exerts its function and effect. The surface treatment agent of the present invention is applied to the surface to form a surface treatment layer, or (2) the sheet on which the surface treatment agent of the present invention is applied to form a surface treatment layer has the surface treatment layer on the outside. (3) affixing the surface treatment agent of the present invention in the form of a film to the surface of the substrate.

In the application of the surface treatment agent in the present invention, a portion (place) where adhesion between the substrate surface and the hydraulic admixture is desired to be prevented, and a portion where friction between the substrate surface and the ground (soil) is desired to be reduced (where Location), a part (place) where adhesion between the surface of the base material and the ground (soil) is desired to be suppressed, and a part (place) where water is to be stopped by filling the gap between the base material surfaces. It will be applied to the material surface or sheet, but may be applied to other parts. The coating amount is not particularly limited, and is preferably, for example, 40 to 700 g / m ² . 40
If the amount is less than g / m ² , the effects of the present invention may not be sufficiently exerted. If the amount exceeds 700 g / m ² , the time until coating and drying becomes long, which is economically disadvantageous. There is a possibility that. More preferably, 50
To 500 g / m ² , and more preferably 70 to 30 g / m ^2.
0 g / m ² . The surface of the base material may be subjected to another surface treatment, or may be coated with an undercoat or the like.

When the surface treating agent of the present invention is applied to a sheet and the sheet is attached to the surface of a substrate, for example, cloth, paper,
A sheet such as a plastic film can be used. In this case, it is preferable to apply a pressure-sensitive adhesive on the back surface of the sheet, since it is easy to attach the sheet to the surface of the base material.
The pressure-sensitive adhesive is not particularly limited. For example, a commonly used acrylic pressure-sensitive adhesive may be used, or if a grease oil or the like is used, it is easy to peel off and re-attach when a mistake is made at a construction site. Is preferable.

A surface treatment layer is formed on the substrate surface by the surface treatment agent of the present invention, and a water resistance imparting agent is applied as a top coat (top coat) on this surface treatment layer. A property imparting layer can be formed. Thereby, for example, when storing the base material,
To prevent the water-absorbent resin (a) from swelling by absorbing rain, night dew, moisture from the ground, etc., and not being able to exert its effect sufficiently in hydraulic admixtures or ground. And a decrease in the adhesion between the surface of the base material and the surface treatment layer can be further suppressed. In other words, in the construction of ground foundation structures, etc., the adhesion of the surface treatment layer is maintained (prevention of peeling) both during storage of the base material before construction and during construction.
And the water-absorbent resin (a) can be sufficiently compatible with the water-swelling swelling due to the alkaline water in the hydraulic mixture or the moisture in the ground.

As the above-mentioned water-resistance imparting agent, those capable of forming a water-resistance imparting layer capable of preventing the water-absorbing resin (a) in the surface-treated layer from swelling before exerting its function can be formed. If it is not particularly limited, for example, the above-mentioned binder resin (b); a conventionally known water repellent such as a wax or a silicone-based water repellent can be used. As a method of applying the water resistance imparting agent, when a solvent is not contained, for example, application (application) can be performed at the same application temperature and melt viscosity as in the case of the above-described surface treatment agent. When a solvent is contained, a commonly used coating method of paint can be used.Specifically, the paint may be applied using a brush, a roller, or the like, or may be applied using a spray device such as a lithigirigan. It may be spray painted. Here, the adhesion amount of the water resistance imparting agent is about 50 g / m ² suffices, but is not particularly limited.

When the surface treatment agent of the present invention is used, the above-described effects can be obtained. However, the surface treatment agent is a hydraulic admixture and / or a buried substance buried in the ground (soil),
In a buried product obtained by applying the surface treatment agent of the present invention, since a surface treatment layer of the surface treatment agent of the present invention is formed on the surface of the base material of the buried product, various effects can be exerted by exerting the effects of the present invention. This is effective for improving efficiency in foundation works and the like. Such an embedded object is also one of the preferred embodiments of the present invention.

A method for preventing adhesion of a buried object, which suppresses the adhesion between the substrate surface of the buried object and the hydraulic admixture,
Similarly, the surface treatment agent of the present invention and / or the method of preventing adhesion of a buried object using the buried object which is a preferred embodiment of the present invention exerts the effect of the present invention to improve the efficiency in various foundation works and the like. It is effective to improve. Also, a method for reducing the friction between the substrate surface of the buried object and the ground (soil), and the method of reducing the friction between the substrate surface of the buried object and the ground (soil). Soil adhesion prevention method, and
Also for the water stopping method of filling the gaps between the substrate surfaces of the buried object and stopping water, the surface treatment agent of the present invention and / or by using the buried object which is a preferred embodiment of the present invention,
This is an effective method to improve efficiency in various types of foundation work. These methods of preventing the adhesion of the buried object, the method of reducing the friction of the buried object, the method of preventing the soil from adhering to the buried object, and the method of stopping the water of the buried object are also preferred embodiments of the present invention.

The above-mentioned buried material means a hydraulic mixture and / or a base material buried in the ground (soil). The state is as follows: (1) The hydraulic mixture and / or the ground (soil) From the base material before being buried, (2) the hydraulic mixture and / or the substrate buried in the ground (soil), and (3) the hydraulic mixture and / or the ground (soil) The base material in a state where the base material has been pulled out can be used. That is, the above-mentioned buried object means the base material in these states. Further, the entire buried object does not need to be buried in the hydraulic mixture and / or the ground (soil), and it is sufficient that at least a part is buried in the hydraulic mixture and / or the ground (soil).

The shape, length, material and the like of the above-mentioned buried object are not particularly limited. For example, when used as a hydraulic admixture adhesion inhibitor, a columnar substrate such as an H-type steel, an I-type steel, an iron column, a concrete pile, a pole, a cylindrical columnar substrate such as a cylindrical pile (hollow pile), and a long plate A sheet pile, a sheet pile, a corrugated sheet, etc., which are plate-shaped piles, may be mentioned, and among these, a steel sheet pile, an H-shaped steel, a steel pipe, or a cylindrical columnar substrate is preferable. When used as a friction reducing agent, there is no particular limitation as long as it is an underground structure, a substrate or a base material used in a submersion method or a propulsion method, and pipes such as steel pipes and fume pipes, steel sheet piles, corrugated sheets, and H-shaped Piles such as steel, I-section steel, steel pipe piles, iron poles, concrete piles, poles, etc., various tanks used in the latent box method, water storage tanks, and the like.
In addition, when used as a soil adhesion inhibitor, the base material is not particularly limited as long as it is a base material used as a temporary steel material on the premise of drawing and collecting to constitute a retaining wall and the like, and a steel sheet pile, a corrugated sheet, an H-shaped sheet Piles such as steel, I-section steel, steel pipe piles, iron columns, and the like are included. Further, when used as a water-stopping agent, the material is not particularly limited as long as it is a substrate used in a water-stopping method, and a steel sheet pile (particularly, a joint portion), a corrugated sheet, an H-shaped steel, an I-shaped steel, a steel pipe pile, Examples include iron pillars, concrete piles, and poles such as poles.

In the present invention, when the above-mentioned buried object constitutes a structure such as a ground foundation structure such as a retaining wall or a foundation, and the structure is constituted by at least the buried object and a hydraulic admixture, Examples of the hydraulic admixture constituting the structure include various concretes and various mortars, but are not particularly limited. Examples of the form of such a hydraulic admixture include an admixture containing water and a material such as cement that hardens with water, and more specifically, water and cement such as Portland cement or mixed cement. And, if necessary, an admixture containing an aggregate such as sand or gravel, a cement admixture, an admixture, a reinforcing material, and the like. In this case, the types and combinations of cement, aggregate, admixture, admixture, reinforcing material, and the like contained in the hydraulic admixture, that is, the composition of the hydraulic admixture are not particularly limited.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
This will be described by showing and exemplifying 6. Figures 1-4
BRIEF DESCRIPTION OF THE DRAWINGS It is sectional conceptual drawing which illustrated embodiment of the surface treatment agent of this invention used as a hydraulic-mixture adhesion inhibitor. In FIG.
FIG. 2 is a conceptual cross-sectional view of a part of a buried object 1 a buried in a hydraulic mixture 2 near the surface of a base material. Fig. 1 (1)
In the example, the hydraulic admixture 2 contains alkali water and the hydration has not progressed, and the surface treatment layer 3 has not sufficiently absorbed the alkaline water. The hydration of the product 2 proceeds, and the water-absorbing swelling of the water-absorbent resin (a) in the surface treatment layer 3 also progresses.
Then, the hydration of the hydraulic admixture 2 is completed so that the water-absorbent resin (a) which has swollen by water absorption is dried and the water-absorbent resin (a) is dried and hydrated with the surface treatment layer 3. Is a state in which a gap is formed between them. in this way,
By the gap formed as shown in FIG. 1 (3), the adhesion between the substrate surface and the hydraulic admixture 2 is suppressed, and the embedded object 1
a can be easily removed from the hydrate of the hydraulic admixture 2. Further, even when the embedded object 1a is removed from the hydraulic admixture 2 in the state shown in (2), the presence of the surface treatment layer 3 that has swollen by water exists between the embedded object 1a and the hydraulic admixture 2. This can be easily performed.

FIGS. 2 (1) to 2 (3) show an example of a ground substructure formed in the ground 4. FIG. The ground substructure of FIG. 2A is formed of the hydraulic admixture 2 and the buried object 1a, and a surface treatment agent is applied to the base material surface of the buried object 1a prior to the formation of the ground substructure. Thus, a surface treatment layer 3 is formed. In this case, as a method of forming the ground foundation structure, for example, after forming an excavation hole in the ground 4 and loosely inserting the buried object 1a, the hydraulic admixture 2 is formed around the buried object 1a.
Or by embedding the embedded object 1a in the hydraulic admixture 2 installed in the excavation hole. In such a ground foundation structure, an operation of removing the buried object 1a from the hydraulic admixture 2 or its hydrate is performed.

The ground substructure shown in FIGS. 2 (2) and 2 (3) is formed of a hydraulic admixture 2 and a tubular buried object 1c.
A surface treatment agent is applied to the upper surface (pile head) of the inner surface of the buried object 1c before the formation of the ground substructure to form the surface treatment layer 3. In this case, as a method of forming the ground foundation structure, for example, the method can be performed by embedding the buried object 1c in the hydraulic admixture 2 cast in the excavation hole. In such a ground foundation structure, after hydration of the hydraulic admixture 2, an operation of peeling off the hydrate of the hydraulic admixture 2 from the pile head 2a on the inner surface of the buried object 1c is performed. It will be provided for construction. 2 (1) to 2 (3) show a state in which the water-absorbent resin (a) in the surface treatment layer 3 has swollen by water.

In the present invention, in the embodiment shown in FIGS. 2 (1) to 2 (3) and the like, the surface treatment layer 3 is formed as shown in FIGS. 1 (1) to 1 (3).
By acting as described above, it becomes possible to efficiently and easily perform the work of extracting the buried object from the hydraulic admixture or its hydrate.

In the embodiment shown in FIGS. 1 and 2, since the surface treatment layer 3 gradually absorbs water from the surface, the water-absorbing swelling ratio of the water-absorbent resin (a) is large near the surface of the surface treatment layer 3, and In some cases, the water-absorbing resin (a) existing near the surface of the base material also gradually absorbs and swells with water. That is, in the present invention, when the water-absorbing resin (a) present in the surface treatment layer 3 swells by water absorption, a part thereof may be in a state of water absorption and swelling, or the whole may be in a state of water absorption and swelling. Good. This is the same in the embodiments shown in FIGS. 3, 4 and 6 below. In addition, the conceptual diagram shows that the thickness of the surface treatment layer 3 is larger when the water-absorbing resin swells than when the surface-treating layer 3 is dry. In practice, the thickness of the surface treatment layer 3 is several times to several tens times or more when the water-absorbing swells when dried. This is the same in the following embodiments and the like.

In the various structures as described above, when the buried object is pulled out of the hydraulic mixture, a cavity (hole) having the same shape as the buried object is formed in the structure.
The cavity can be used, for example, as a drain, electric wire,
It can be used as a pipe for inserting a gas pipe, a water pipe, or the like. In addition, the various structures may be bases for installing road signs and the like. That is, after the structure is formed using the embedded object of the road sign desired to be installed, the embedded object is pulled out and the road sign is inserted, whereby the road sign can be installed.

As an embodiment of the present invention, after digging the ground and installing or constructing various structures below the ground surface,
A method for building an underground structure by backfilling with a backfill material in which a cement-based or lime-based solidified material is mixed, wherein between the backfill material and a member that constitutes the retaining wall or the retaining wall,
A method for constructing an underground structure in which a surface treatment layer formed by the surface treatment agent of the present invention is present. Such a method of constructing an underground structure is one of preferred embodiments of the present invention.

In the above-mentioned method of constructing an underground structure, for example, a trench is excavated as a preliminary step, but prior to the excavation, along the outer periphery of the excavation area to prevent the ground outside the excavation area from loosening or collapse. An earth retaining wall made of steel sheet pile or the like will be constructed. After that, various underground structures are constructed inside the trench, the cut-out portion is backfilled with backfill material, and finally the retaining wall is removed by drawing or the like. here,
Since the surface treatment layer exists between the earth retaining wall or the member constituting the earth retaining wall and the backfill material, the water absorbing resin (a) swells and the earth retaining wall or the member constituting the earth retaining wall is swelled. Since it is possible to prevent adhesion to the backfill material and to prevent separation of the surface treatment layer on the earth retaining wall or a member constituting the earth retaining wall, the foundation for the method of constructing such an underground structure is also required. It is possible to improve the efficiency of construction and the like.

The outline of the method of building the underground structure will be described with reference to FIG. In FIG. 3, the state of the foundation work in the construction of the underground structure 5 is shown as a conceptual sectional view. First, a surface treatment layer 3 is formed on the surface of a base material of a construction member 1d such as a steel sheet pile with the surface treatment agent of the present invention, and the construction member 1d is built into the ground 4 to form a retaining wall. Excavate the ground 4 between the walls to form grooves. After that, the underground buried object 5 is installed in the excavated ground 4, backfilled with a cement-based backfill material 2b, and further backfilled with a backfill material 6 such as soil used as necessary. The construction member 1d, such as a steel sheet pile, on which 3 is formed is pulled out and removed. As described above, by the surface treatment layer 3 formed on the construction member 1d such as the steel sheet pile, the construction member 1d such as the steel sheet pile constituting the retaining wall can be easily built into the ground or pulled out and removed from the ground. Becomes possible.

According to an embodiment of the present invention, a hydraulic mixture is cast using a movable mold, and after the hydraulic mixture is cured, the movable mold is placed on the surface of the cured hydraulic mixture. A method for releasing a movable mold that is slid along, comprising a surface treatment layer formed by the surface treatment agent of the present invention between the movable mold and the hydraulic admixture. A method of releasing a mold is exemplified. Such a method of releasing the movable mold form is one of preferred embodiments of the present invention.

In the method for releasing the movable mold form, for example, when constructing a concrete structure extending long in the horizontal or vertical direction such as a chimney, a pier or a tunnel, or a sewer, the hydraulic admixture is unit length by unit length. In order to construct the concrete, concrete is cast using a movable formwork. Then, after a certain level of strength is obtained, the movable formwork is slid over the surface of the hardened concrete to the place where the next concrete is to be poured, and the mold is released. Casting is carried out, and concrete is constructed to construct a concrete structure. Here, since the surface treatment layer exists between the movable mold and the hydraulic mixture, the adhesion between the mold and the ground can be prevented, and the surface treatment layer on the movable mold can be prevented. It is possible to prevent peeling, and it is possible to easily slide the movable mold.

The movable mold is not particularly limited as long as it retains its shape until the hydraulic admixture exhibits a predetermined strength, and after curing, slides the surface of the cured product to release the mold. However, examples thereof include a form for a slip form method, a form for a jump form method, a machine used for various shield methods, and other sliding form forms.

The outline of the method of releasing the movable mold form will be described with reference to FIG. FIG. 4 is a conceptual cross-sectional view showing the construction of the hydraulic admixture structure. First, using the movable mold 1e on which the surface treatment layer 3 is formed, the movable mold 1e is slid over the existing hydraulically hardened compound 2c which has been cast and hardened, and then the new movable mold 1e is formed. A hydraulic admixture 2d is newly placed in the space. Thus, by the surface treatment layer 3 in the movable mold 1e,
Since the movable mold can be easily slid by suppressing the adhesion between the movable mold and the hydraulic admixture, it is possible to construct a hydraulic admixture structure by inheriting the hydraulic admixture. It will be easier.

Next, an embodiment of the surface treating agent of the present invention used as a friction reducing agent or a soil adhesion preventing agent will be described.
When the surface treatment agent of the present invention is used as a friction reducing agent, the embedding object, that is, the construction form of the substrate or the base material is not particularly limited. For example, a hole may be excavated in the ground, steel or the like as a base may be hung by a crane or the like, installed and buried, or a submersion method, a propulsion method, or the like, which is a method in which the base is driven and pushed while being constructed. May be adopted. In addition, after installing the casing for the pile in the ground, providing the reinforcing steel inside, and then pulling out the casing for the pile while casting the concrete, a construction method of constructing the ground foundation structure composed of reinforced concrete is proposed. Also in the case where the pile casing is used, if the surface treatment layer is formed outside the pile casing, the pile casing can be easily pulled out while suppressing the influence of the earth pressure. As described above, in any of the casting methods according to the present invention, since no solvent is contained, no drying time is required when applying (coating) on the surface of the base material. The base material and the base material can also exert the effect of the present invention, so that the influence on the surrounding ground is minimized, and the base material surface and the ground (soil) are minimized.
The frictional force between them can be reduced, and the speed and efficiency of construction can be significantly improved. In addition, after burial in the ground, the friction between the base material surface of various underground substructures and the surrounding ground can be cut, and changes in the surrounding ground can be prevented from affecting the structure. It can be suitably used for a negative friction cutting method for a substructure. As described above, the negative friction cutting method, the latent box method, and the propulsion method of the underground substructure using the surface treatment agent of the present invention as a friction reducing agent are also preferred embodiments of the present invention.

One of the features of the surface treatment agent of the present invention is that the surface treatment layer has a sustained release when used as a friction reducing agent. Sustained release refers to a wet gel having a water-absorbent resin (a) that has swelled by absorbing water in the ground (soil) gradually from the water-absorbent resin (a) in the surface layer portion of the surface treatment layer. It is a property that the layer is gradually supplied to the surface in contact with the ground (soil). In this case, a wet gel layer is formed on the surface layer in the surface treatment layer, and the wet gel layer functions as a lubricant, and the adhesive strength of the water-absorbing and swollen water-absorbent resin (a) is reduced. When a frictional force is generated between the ground and the ground due to the above, the wet gel layer is peeled off and the friction is reduced. Then, a new wet gel layer is supplied to the surface layer in the surface treatment layer. Such a controlled release can be adjusted by appropriately setting the hydrophilicity and the like of the water-absorbent resin (a). As a result, it is possible to appropriately set the water absorption rate of the surface treatment layer according to various construction conditions and the required performance of the underground substructure, and from the surface of the surface treatment layer applied to the base material surface, By absorbing an appropriate amount of water in the soil, it is possible to supply a new wet gel layer (water-absorbing swelling layer) to the substrate surface over many days, that is, over a long period of time.

The above-mentioned sustained release will be described with reference to FIG. 5 as a specific example. 5 (1) to 5 (4) show conceptual cross-sectional views of a part of the embedded object 1a near the surface of the base material. As shown in FIG. 5 (1), the surface treatment agent of the present invention is applied to an embedded object 1a (for example, a steel pipe) to form a surface treatment layer 3, and as shown in FIG. After the wet gel layer is formed, when the buried object 1a is driven into the soil (day 1), a frictional force is generated between the base material surface of the buried object 1a and the ground 4, but the wet gel layer is lubricated. While functioning as an agent, the wet gel layer is peeled off from the surface of the surface treatment layer 3 as shown in (3). By the construction on the next day, the surface of the surface treatment layer 3 will absorb and swell the moisture in the soil to form a new wet gel layer, as shown in (4). On the second day, when the buried object 1a is cast from the ground in the same manner as the first day and is further pushed deep into the soil, the wet gel layer similarly functions as a lubricant,
It comes off from the surface of the surface treatment layer 3. By repeating the phenomena shown in (3) and (4), the surface treatment agent of the present invention can be applied to the ground even when the propulsion method or the like in which the casting is repeated for many days in the soil is performed. It is possible to exhibit the friction reducing function in the soil throughout the construction only by applying it once to the buried object.

Since the surface-treated layer formed by the surface-treating agent of the present invention has the property of sustained release as described above, when it is used as a friction-reducing agent, the surface-treating layer has excellent durability. Even after the burial, the friction reduction effect is maintained for a long period of time, and even if the ground or the like changes, the fluctuation or displacement of the buried object on the ground can be minimized. As a result, a buried object such as a ground foundation structure is stabilized in the ground, and a building such as a building to be built thereon is stabilized. For example, even when a ground foundation structure is constructed in a hole in the soil with a crane or the like, the effect of reducing friction between the base material surface and the ground (soil) will be maintained for a long period of time. By using the surface treatment agent of the present invention, it becomes possible to perform a negative friction cut method for the ground substructure.

When the surface treating agent of the present invention is used as an agent for preventing soil adhesion, the embedding structure of a temporary steel material or the like may be
It is not particularly limited as in the case of using as a friction reducing agent described above. In this case, it is preferable to appropriately adjust the thickness of the surface treatment layer formed on the surface of the base material of the buried object depending on construction conditions and the like. For example, when the amount of water in the soil is small or when the embedding period of a temporary steel material or the like is short, by reducing the thickness of the surface treatment layer, even a relatively small amount of water reduces the adhesion to the substrate surface. Is preferred. This makes it easier for the buried object to be peeled off when it is poured into the ground and moistened, thereby making it possible to suppress the adhesion of soil to the surface of the base material. In addition, when the moisture content in the soil is large or when the embedding period of the temporary steel material is long, the thickness of the surface treatment layer is increased, so that even if there is a relatively large amount of water, the wet gel layer is formed during the embedding period. The supply can be stabilized to prevent soil from adhering to the substrate surface. In this way, the thickness of the surface treatment layer can be adjusted,
By adjusting the hydrophilicity and the like of the water-absorbent resin (a) in the same manner as in the case of using as the friction reducing agent, it is possible to exhibit the ability to prevent soil adhesion according to the soil properties at various sites, the burial period, etc. Becomes

When the surface treatment layer of the present invention is used as a soil adhesion inhibitor to form a surface treatment layer on the surface of a base material of a buried object such as a temporary steel material, the surrounding ground is pulled up when the buried object is pulled out. Since the buried object after pulling out has almost no soil adhesion and the voids generated in the ground after pulling out the buried object are minimized (substantially the same as the volume of the temporary steel material itself), post-treatment (backfilling)
The use of chemicals and earth and sand required for the operation will be minimized.

Next, an embodiment of the surface treating agent of the present invention used as a water stopping agent will be described. When the surface treatment agent of the present invention is used as a water-stopping agent, as described above, the surface treatment layer is formed of a friction reducing agent or a soil adhesion preventing agent as an application form of a surface treatment base material such as a steel sheet pile. There is no particular limitation as in the case where The waterproofing agent of the present invention can be easily applied to a base material such as a steel sheet pile, that is, it can be easily applied to a steel sheet pile joint portion or the like. Separation of the surface treatment layer from a part or the like can be reduced. In addition, since the water-absorbent resin (a) has a high swelling ratio after casting, it can exhibit high water-stop performance even in the case of a thin film. After use, the surface treatment layer is removed from the steel sheet pile joint and the like. Can be made easier. For example, in order to construct a waterproof wall using a steel sheet pile continuous wall, the waterproofing agent according to the present invention is previously applied to a steel sheet pile joint, and after the steel sheet pile is driven into the ground (soil), By absorbing the water in (soil) and swelling, it fills the voids in the joint portion and exhibits the water stopping performance.

FIG. 6 is a conceptual cross-sectional view of the vicinity of the joint portion of the buried objects 1a and 1b cast in the ground (soil). FIG. 6A shows a state in which the surface treatment layer 3 applied to the joint portion has not absorbed and swollen, and a state in which a void exists between the buried objects 1a and 1b. In (2), the water-absorbing resin (a) 3 in the surface treatment layer 3
a shows a state in which water swells sufficiently, whereby a gap between the buried objects 1a and 1b is filled, and it is possible to exhibit water stopping performance.

In each of the above embodiments, the present invention provides:
By using a water-absorbent resin (a) and a hot-melt binder resin (b) as essential components and using a surface treatment agent having a volatile component of 10% by weight or less when heated at 180 ° C. for 10 minutes, a drying time is not required. The workability can be improved, and the safety in the work can be improved, and the surface treatment layer can sufficiently exert its function.

[0074]

EXAMPLES The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples. In the examples, “parts” means “parts by weight” unless otherwise specified.

Production Example 1 A water-absorbing resin was prepared by the following method. That is, a kneader equipped with a table-top jacket having a capacity of 1.5 L and provided with a thermometer and a blade (stirring blade), the inner surface of which is lined with ethylene trifluoride, was used as a reactor, and methoxypolyethylene glycol methacrylate was used as the reactor. (Molecular weight 512) 60.18 g, methacrylic acid (molecular weight 86.0)
9) 3.76 g, sodium methacrylate (molecular weight 10
8) 210.69 g, 1.3 g of polyethylene glycol diacrylate as a cross-linking agent, and 352.37 g of ion-exchanged water as a solvent were charged. The proportion of the crosslinking agent in the monomer component is 0.14 mol%.

By flowing warm water of 50 ° C. through the jacket, the above aqueous solution is stirred under a nitrogen gas stream while stirring.
Heated to ° C. Then, 2,2'-azobis- (2-amidinopropane) dihydrochloride (molecular weight 2
71.27, Chemical product V-50 manufactured by Wako Pure Chemical Industries, Ltd.)
Was added and stirred for 10 seconds, then the stirring was stopped and the mixture was allowed to stand. The ratio of the polymerization initiator to the monomer component is 0.2 mol%.

The polymerization reaction was started immediately after the addition of the polymerization initiator, and the internal temperature reached 100 ° C. (peak temperature) after 90 minutes. Thereafter, the contents were aged for an additional 30 minutes while flowing hot water at 80 ° C. through the jacket. Thus, a hydrogel was obtained. After completion of the reaction, the hydrogel was disintegrated by rotating a blade until the hydrogel became fine, and then the hydrogel was taken out by inverting the reactor. The obtained hydrogel was dried at 140 ° C. for 3 hours using a hot-air circulation dryer. After drying, the dried product was pulverized using a desktop simple pulverizer (manufactured by Kyoritsu Riko Co., Ltd.). Thereby, the average particle diameter is 1
A water-absorbent resin (1) having a thickness of 60 μm was obtained.

Production Example 2 0.44 kg of acrylic acid and 2.3 of ethyl acrylate were placed in a 50 L capacity tank reactor equipped with a thermometer and a dropping device.
kg, 0.25 kg of methyl methacrylate, 12 g of 2,2'-azobis- (2,4-dimethylvaleronitrile) as a polymerization initiator, and methyl alcohol 3 as a solvent
kg. In addition, acrylic acid 1.0
A mixed solution consisting of 0 kg, 2.2 kg of methyl acrylate, 3.75 kg of methyl methacrylate, 26 g of 2,2'-azobis- (2,4-dimethylvaleronitrile), and 7 kg of methyl alcohol was charged.

The above methyl alcohol solution was heated to 65 ° C. with stirring in a nitrogen gas atmosphere, and reacted for 20 minutes. Thereby, the polymerization rate of the content was adjusted to 72%. Subsequently, while maintaining the internal temperature at 65 ° C., the above mixed solution was dropped uniformly from the dropping device over 2 hours. After completion of the dropwise addition, the content was aged at 65 ° C. for another 3 hours. After completion of the reaction, a 33% by weight methyl alcohol solution of the hot melt binder resin (1) was obtained by mixing the content with 10 kg of methyl alcohol.

Next, a 33% by weight methyl alcohol solution of the hot melt binder resin (1) was degassed and pelletized using a twin screw extruder and a pelletizer, and the pellets of the hot melt binder resin (1) were removed. Obtained. The weight average molecular weight of the obtained binder resin (1) was 120,000, and the acid value was 110 mgKOH / g.
Further, as a result of performing differential scanning calorimetry of the binder resin (1), the glass transition temperature of the binder resin (1) was-
It had two in the range of 80 ° C to 120 ° C.

Example 1 90 parts of a pulverized product of the water-absorbent resin (1) obtained in Production Example 1,
Hot melt binder resin (1) obtained in Production Example 2
90 parts of pellets and 20 parts of dioctyl phthalate as a plasticizer were mixed and stirred to obtain a hot melt surface treating agent (1). The hot melt surface treatment agent (1) was heated at 180 ° C. for 10 minutes, and the amount of volatile components was measured.
% By weight.

Example 2 90 parts of the pulverized product (1) of the water-absorbent resin obtained in Production Example 1,
120 parts of Molescomelt S-1491R (trade name, SEPS manufactured by Matsumura Sekiyu KK) and 20 parts of dioctyl phthalate as a plasticizer were mixed and stirred, and a hot melt surface treating agent (2)
I got 180 ° C of the hot melt surface treatment agent (2)
For 10 minutes and the amount of volatile components was measured.
It was 9% by weight.

Example 3 The hot melt surface treating agent (1) obtained in Example 1 was
40mm on a steel plate of thickness 3mm, width 30mm and length 300mm
Coating was performed at 170 ° C. with a coating amount of 0 g / m ² to obtain a steel plate (1) coated with a hot melt surface treatment agent. The melt viscosity at that time was 4.5 × 10 ⁴ mPa · s.

Next, a polypropylene cylinder having a diameter of 80 mm and a height of 250 mm was filled with a cement milk having the composition shown in Table 1 to a height of 150 mm, and a steel plate (1) coated with a hot melt surface treatment agent was placed therein. Stand upright,
Cured at room temperature (about 20 ° C.) for 7 days. After curing for 7 days,
The steel plate was pulled out manually using a 490 N spring balance, and the pulling force was measured. Table 2 summarizes the results.

Example 4 Example 3 was repeated except that the hot melt surface treating agent (2) obtained in Example 2 was used instead of the hot melt surface treating agent (1) obtained in Example 1. The same operation as in Example 3 was repeated to check the data of the cement friction cut performance, and the results are summarized in Table 2.

Comparative Example 1 The same procedure as in Example 3 was repeated except that the steel sheet (1) coated with the hot-melt surface treatment agent was replaced with an uncoated steel sheet. And the results are summarized in Table 2.

[0087]

[Table 1]

[0088]

[Table 2]

Example 5 The hot-melt surface treating agent (1) obtained in Example 1 was dried at 170 ° C. on the surface (both inside and outside) of a steel pipe having a thickness of 1 mm, a diameter of 50 mm and a length of 500 mm. 400g /
A steel pipe (1) coated with a hot-melt surface treatment agent was prepared by coating with a coating amount of m ² and cooling at room temperature for 1 hour.

Next, the steel pipe (1) coated with the hot melt surface treatment agent was immersed in ion exchanged water for 10 minutes. The surface of the steel pipe after the immersion was slimy covered with the water absorbing and swollen friction reducing agent layer. The surface was in a state where the water-absorbent resin swelled by water absorption, became slimy, and was very slippery.

Next, this steel pipe is erected vertically on the ground on the premises of our company (Suita City, Osaka Prefecture), and a 3 mm thick
A steel pipe of 0 mm × 60 mm was placed on the steel pipe, and a steel pipe was driven into the soil by hitting it 10 times from a height of 60 cm with a 500 g hammer. Table 3 shows the depth cast from the ground at this time. The steel pipe was left for one day, and the next day, about 500 ml of ion-exchanged water was first applied to the surface (both inside and outside) of the steel pipe, and left for about 10 minutes. The surface of the steel pipe after standing was slimy covered with the water-absorbed and swollen friction reducing agent layer. Next, a steel pipe was poured into the soil in the same manner as on the first day.
At this time, Table 3 shows the depth cast from the ground surface. Further, the steel pipe was allowed to stand for one day, and was driven by the same operation as on the second day. The depth of the steel pipe from the ground surface is shown in Table 3.

The depth cast from the ground surface in the above experiment was considerably larger than that of the uncoated steel pipe (Comparative Example 2) throughout the first to third days, and the depth decreased to the first to third days. Did not. From these results, it can be seen that by applying the hot melt surface treating agent (1) of the present invention to the substrate surface, the friction reducing agent layer is supplied to the substrate surface over 3 days, and the friction reducing effect is sufficiently sufficient. You can see that it was maintained and exhibited.

Example 6 Example 1 was repeated except that the hot-melt surface treating agent (2) obtained in Example 2 was used instead of the steel pipe (1) coated with the hot-melt surface treating agent. The same operation as described above was repeated to measure the depth of the first to third days, and the results are summarized in Table 3.

As can be seen from Table 3, similarly to Example 5, the depth cast from the ground surface was considerably larger than the uncoated steel pipe (Comparative Example 2) throughout the first to third days. And its depth did not decrease until the first to third days. From these results, it can be seen that by applying the hot melt surface treating agent (2) of the present invention to the substrate surface, the friction reducing agent layer is supplied to the substrate surface over 3 days, and the friction reducing effect is sufficiently high. Maintenance,
You can see that it was demonstrated.

Comparative Example 2 The same operation as in Example 1 was repeated, except that in place of the hot-melt surface treatment agent-coated steel pipe (1), a steel pipe to which nothing was applied was used. , 1-3
The depth cast on the day was measured and the results are summarized in Table 3. As can be seen from Table 3, the depth cast from the ground surface was smaller during the first to third days, and the depth became smaller as the number of days passed.

[0096]

[Table 3]

Example 7 The lower part of a type IV steel sheet pile of 8.1 m in length 7.5 m (both front and back)
Then, using a hot melt coater, the hot melt surface treatment agent (1) obtained in Example 1 was applied at 170 ° C. so as to have a thickness of 200 μm, and dried at an outside temperature for 1 hour. Hot melt surface treatment agent (1) A coated steel sheet pile was obtained. The hot-melt surface treatment agent (1) coated steel sheet pile was buried in the soil of Shinagawa-ku, Tokyo (silt layer) using a vibro, and after one month, it was also pulled out using the same vibro. Table 4 summarizes the adhesion state of the soil and the coating film of the hot melt surface treatment agent (1) coated steel sheet pile after drawing.

As can be seen from Table 4, the hot melt surface treatment agent (1) did not show any adhesion of the soil and hot melt surface treatment agent (1) coating film to the coated steel sheet pile, and the soil adhesion prevention ability. Is very good.

Example 8 In Example 7, the hot melt surface treating agent (2) obtained in Example 2 was replaced with the hot melt surface treating agent (2) obtained in Example 2 in place of the coated steel sheet pile to a thickness of 200 μm. Like one
Coating at 70 ° C., drying at ambient temperature for 1 hour, and the same operation as in Example 7 except that hot melt surface treatment agent (2) coated steel sheet pile is used. Table 4 summarizes the adhesion of the melt surface treatment agent (2) coating film.

As can be seen from Table 4, no soil or hot melt surface treatment agent (2) was applied to the coated steel sheet pile, and no soil adhesion was observed. Is very good.

Comparative Example 3 The same operation as in Example 7 was carried out except that in place of the hot-melt surface treatment agent (1) coated steel sheet pile, an uncoated steel sheet pile was used. Table 4 shows the adhesion of soil after the extraction.

[0102]

[Table 4]

Example 9 The hot-melt surface treating agent (1) obtained in Example 1 was coated on a steel substrate 12 mm × 50 mm (two surfaces) shown in FIG.
At a coating thickness of 600 µm (dry coating thickness) at 170 ° C
And cooled at room temperature for 1 hour. Then, a rectangular parallelepiped gap (5 mm × 1) in which these two faces faced each other with a gap of 5 mm.
2 mm × 50 mm) [gap (1) coated with hot melt surface treatment agent].

Next, the gap (1) coated with the hot melt surface treatment agent was placed on the lower surface of the apparatus for measuring the water permeation rate shown in FIG. 3, and was immersed in ion-exchanged water for 24 hours. After filling, the water permeation rate was calculated by measuring the height of the water surface at regular intervals, and the results are shown in Table 5.

From the results shown in Table 5, it can be seen that the hot melt surface treating agent (1) of the present invention has a low ultimate water permeability (high water stopping performance) and a short time to reach the final water permeability (approximately). Good results were obtained as a very water-stopping agent, such as reaching in one day, swelling speed is fast), and exhibiting higher water-stopping performance with a thinner film (inexpensive, hard to peel off during casting).

Example 10 The hot melt surface treating agent (2) obtained in Example 2 was used instead of the hot melt surface treating agent (1) in Example 9.
The same operation as in Example 9 was performed, except that the water permeation rate was used. Table 5 shows the measured water transmission rates.

From the results in Table 5, it can be seen that the hot melt surface treating agent (2) of the present invention has a low ultimate water permeability (high water stopping performance) and a short time to reach the final water permeability (approximately). Good results were obtained as a very water-stopping agent, such as reaching in one day, swelling speed is fast), and exhibiting higher water-stopping performance with a thinner film (inexpensive, hard to peel off during casting).

Comparative Example 4 In Example 9, pile lock NS (trade name, manufactured by Nippon Kagaku Co., Ltd.) was applied in a dry thickness of 2000 μm instead of the gap (1) coated with the hot melt surface treatment agent. The same operation as in Example 9 was performed, except that the comparative gap (1) was used, and the measured water permeation rates are shown in Table 5.

From the results shown in Table 5, it can be seen that, with the hot-melt surface treating agent (2) of the present invention, although the ultimate water permeation speed is small (water stoppage performance is high), the time until reaching the final water permeation speed is slightly longer. (Achieved in about 3 days, the swelling speed is slow), and a somewhat problematic result was obtained as a water-stopping agent such that a high water-stopping performance could not be exhibited unless the film was rather thick (expensive, easy to peel off at the time of casting).

[0110]

[Table 5]

[0111]

Since the surface treating agent of the present invention has the above-mentioned constitution, it is possible to improve the workability without requiring a drying time and to improve the safety in the work. Hydraulic admixture adhesion inhibitor that suppresses adhesion between water and hydraulic admixture, friction reducing agent that reduces friction between substrate surface and ground (soil), Since it can be used as a soil adhesion preventive agent that suppresses adhesion between layers, or as a water stoppage agent that fills the gaps between base material surfaces and stops water, it reduces the cost of foundation work, etc.
And it is effective to complete the construction quickly and to protect the ground foundation structure.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view for explaining the function and effect of a surface treatment layer in an embodiment in which the surface treatment agent of the present invention is used as a hydraulic admixture adhesion inhibitor.

FIG. 2 is a cross-sectional conceptual diagram illustrating an embodiment of the present invention, and is a cross-sectional conceptual diagram showing a ground substructure using a buried object obtained by applying the surface treatment agent of the present invention as a hydraulic admixture adhesion inhibitor. FIG.

FIG. 3 is a conceptual cross-sectional view illustrating an embodiment of the present invention, and is a conceptual cross-sectional view for explaining a method of building an underground structure.

FIG. 4 is a conceptual cross-sectional view illustrating an embodiment of the present invention, and is a schematic cross-sectional view for explaining a method of releasing a movable mold.

FIG. 5 is a conceptual cross-sectional view for explaining the function and effect of the surface treatment layer in the embodiment in which the surface treatment agent of the present invention is used as a friction reducing agent or an soil adhesion preventing agent.

FIG. 6 is a conceptual cross-sectional view for explaining the function and effect of the surface treatment layer in the embodiment using the surface treatment agent of the present invention as a water stopping agent.

FIG. 7 is a schematic view of a gap provided with a water-stopping agent for measuring a water permeation rate as an index of water-stopping performance when the surface treatment agent of the present invention is used as a water-stopping agent.

FIG. 8 is a schematic view of an apparatus for measuring a water permeation rate as an index of water stopping performance when the surface treating agent of the present invention is used as a water stopping agent.

[Explanation of symbols]

1a, 1b Buried object 1c Tubular buried object 1d Construction members such as steel sheet piles 1e Moving formwork 2 Hydraulic admixture 2a Pile head 2b Cement-based backfill material 2c Existing hydraulic admixture 2d New hammering Hydraulic admixture provided 3 Surface treatment layer 3a Water-absorbing resin (a) 3b Binder resin insoluble in water and alkaline water (b) 4 Ground 5 Underground buried material 6 Backfill material for soil used as necessary 7 Surface where water-blocking agent is applied (coated) 8 Gap where water-blocking agent swells and stops water 9 Surface to be connected to 14 of device for measuring water permeation speed (FIG. 8) 10 Glass tube 11 Acrylic tube (φ30 mm) 12 Epoxy-based sealing material 13 Teflon (registered trademark) plate 14 Position to be connected to 9 of gap with water-blocking agent applied (Fig. 7)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E02D 31/00 E02D 31/00 A (72) Inventor Akira Hattori 4-1-1 Komyobashi, Chuo-ku, Osaka-shi, Osaka No. 1 F-term in Nippon Shokubai Co., Ltd. (reference) 2D050 BB10 DA10 4H017 AA04 AC02 AC04 AC06 AD06 4J038 CG001 CG002 CQ012 DD002 DG002 MA15

Claims (5)

[Claims] 1. A surface treating agent comprising a water-absorbent resin (a) and a hot melt binder resin (b) as essential components and having a volatile component of 10% by weight or less when heated at 180 ° C. for 10 minutes. A surface treating agent which is used as a hydraulic admixture adhesion inhibitor which, when applied to the surface of a material, suppresses adhesion between the substrate surface and the hydraulic admixture. 2. A surface treating agent comprising a water-absorbent resin (a) and a hot melt binder resin (b) as essential components and having a volatile component of 10% by weight or less when heated at 180 ° C. for 10 minutes. A surface treatment agent characterized by being used as a friction reducing agent that is applied to the surface of a material to reduce friction between the substrate surface and the ground (soil). 3. A surface treating agent comprising a water-absorbent resin (a) and a hot melt binder resin (b) as essential components and having a volatile component of 10% by weight or less when heated at 180 ° C. for 10 minutes. A surface treatment agent characterized by being used as a soil adhesion preventive agent that is applied to the surface of a material to suppress the adhesion between the base material surface and the ground (soil). 4. A surface treating agent comprising a water-absorbent resin (a) and a hot-melt binder resin (b) as essential components and having a volatile component of 10% by weight or less when heated at 180 ° C. for 10 minutes. A surface treatment agent characterized by being used as a water stopping agent that is applied to the surface of a material to fill gaps between the surfaces of the base material and stop water. 5. The surface treating agent has a working temperature of 120 to 180 ° C. when applied, and a melt viscosity at the working temperature of 1.0 × 10 ^{3 to} 5.0 × 10 ⁴ mPa.・
5. The surface treatment agent according to claim 1, wherein the surface treatment agent is s.