JP2002309171A - Urethane-based surface-treating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-treating agent capable of forming a surface- treated layer firmly adhered to the surface of a base material and useful as an adhesion-suppressing agent for a hydraulic mixture, a friction reducing agent or a soil-sticking inhibitor. SOLUTION: The surface-treating agent comprises as essential ingredients an isocyanate group-terminated urethane prepolymer, obtained by reacting as essential reactants a polyether polyol (a) and/or a polyester polyol (b) and an organic polyisocyanate (c), or the isocyanate group-terminated urethane prepolymer and a solvent, and is useful as a hydraulic mixture adhesion inhibitor to be applied on the surface of a base material thereby to inhibit adhesion between the surface of the base material and a hydraulic mixture.

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, or a soil adhesion inhibitor.

[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.

Various studies have been made on such a problem. For example, Japanese Patent Publication No. 5-19612 discloses a technique for facilitating pulling out of a pile from cement. The technique relates to a rewetting lubricating layer in which a water-absorbing polymer and a rewetting binder are kneaded and dried and solidified. It is disclosed that a PVA-based paste or the like is used. Japanese Patent Application Laid-Open No. 63-165615 discloses a technique for reducing the frictional force between bentonite mortar and ground and steel.
Japanese Patent Application Laid-Open Publication No. HEI 9-133873 relates to forming a film by applying a volatile film-forming resin and a superabsorbent resin, and using a natural rubber, a synthetic rubber, or a latex in which a plastic is suspended in water as a volatile film-forming resin. Is disclosed. 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. A dispersion mixed with a non-aqueous liquid is disclosed, and JP-A-63-27619 discloses a dispersion.
In the examples, water swellable paints in which polyvinyl butyral and gelatin or agar fine powder are mixed and alcohol is used as a solvent are disclosed.

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. It is another object of the present invention to reduce friction with the ground by swelling and exfoliating the water-absorbent resin when or after the base material is embedded in the ground.

However, there have been problems that the water-absorbent resin does not swell properly and that the water-absorbent resin peels off from the surface of the substrate when the substrate is poured. In many cases, a base material is cast in a foundation work, and there is room for researching a material that can sufficiently exert an effect in these uses. Conventionally, there is no effective technique capable of suppressing the adhesion between the surface of the base material and the ground (soil).

Japanese Patent Application Laid-Open No. 11-241339 discloses a surface treating agent containing a water-swellable resin and an alkaline water-soluble resin having an acid value of 15 mgKOH / g or more. The use of this surface treatment agent makes it possible to suppress the adhesion between the base material surface and the hydraulic admixture and improve the efficiency of foundation work, etc., but it is possible to cope with various construction methods and construction conditions. As a result, there is room for devising the essential components of the surface treatment agent in order to broaden the application.

[0010]

DISCLOSURE OF THE INVENTION In view of the above situation, the present invention provides a hydraulic admixture adhesion inhibitor, a friction reducing agent, or a soil adhering agent capable of forming a surface treatment layer which is firmly adhered to a substrate surface. It is an object of the present invention to provide a surface treatment agent used as an inhibitor.

[0011]

Means for Solving the Problems The present inventors have studied a surface treating agent which can be used as a hydraulic admixture adhesion inhibitor, a friction reducing agent or a soil adhesion preventing agent by being applied to a substrate surface. Meanwhile, a specific isocyanate group-terminated urethane prepolymer can be used as a water-absorbing resin in these applications, and at the same time, also functions as a binder to adhere to the substrate surface, and is crosslinked by moisture curing. From this fact, they found that they can firmly adhere to the surface of the base material, and conceived that the above problems could be solved successfully. Further, when the amount of the oxyethylene group in the polyether polyol forming the specific isocyanate group-terminated urethane prepolymer is specified, the present invention can be more reliably performed because appropriate hydrophilicity is exhibited in these applications. It was also found that the function and effect of the present invention were exerted, and the present invention has been achieved.

That is, the present invention relates to an isocyanate group-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c); A surface treating agent containing a urethane prepolymer and a solvent as essential components, and being applied to the surface of a substrate, as a hydraulic admixture adhesion inhibitor for suppressing adhesion between the substrate surface and the hydraulic admixture. This is the surface treatment agent used.

The present invention also provides an isocyanate group-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c), or
A surface treating agent comprising the isocyanate group-terminated urethane prepolymer and a solvent as essential components, and as a friction reducing agent for reducing friction between the substrate surface and the ground (soil) by being applied to the substrate surface. It is also the surface treatment agent used.

The present invention further provides an isocyanate group-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c), or
A surface treatment agent comprising the isocyanate group-terminated urethane prepolymer and a solvent as essential components, the soil treatment agent being applied to a substrate surface to suppress adhesion between the substrate surface and the ground (soil). It is also a surface treatment agent used as. Specifically, it is a surface treatment agent used as a soil adhesion preventing agent for suppressing the adhesion of the ground (soil) to the surface of the base material. The surface treating agent of the present invention is also called a urethane-based surface treating agent. Hereinafter, the present invention will be described in detail.

The surface treating agent of the present invention exerts the following effects (1) to (5) by forming a surface treated layer (coating film) on the surface of a substrate. That is, (1) the isocyanate group-terminated urethane prepolymer functions as a water-absorbing resin, and when used as a hydraulic admixture adhesion inhibitor, swells by absorbing water (alkali water) in the hydraulic admixture. Then, the isocyanate group-terminated urethane prepolymer swollen as the hydraulic admixture hydrates is dried and shrunk, so that a gap can be formed between the substrate surface and the hydraulic admixture,
It is possible to suppress the adhesion between the substrate surface and the hydraulic admixture or 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 water in the ground (soil) absorbs and swells to form a lubricating gel layer,
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 remains in the ground together with the soil, so that the frictional force between the base material surface and the ground (soil) is reduced. It is possible to reduce the amount of soil and the adhesion of soil.

(2) The isocyanate group-terminated urethane prepolymer also functions as a binder and adheres to the substrate surface, but adheres firmly to the substrate surface due to moisture curing and crosslinking. That is, for example, when the base material is buried in the ground or the like, the surface treatment layer is prevented from peeling off during drying. In addition, when wet, a lubricating gel layer is formed, and the lubricating gel layer has a reduced adhesive force and is easily peeled off. Therefore, friction and adhesion to the ground (soil) are prevented, and the effect of the above (1) is improved. It is possible to make full use of it.

(3) When the surface treatment layer has a large adhesion to the substrate surface, but is not so strong, it is possible to minimize peeling of the surface treatment layer due to a large scratching force. it can. (4) When a solvent is used, since the isocyanate group-terminated urethane prepolymer does not absorb and swell upon application, it can be applied uniformly, and has a low viscosity, and can be applied by spraying or the like, thereby facilitating the application operation. Becomes (5) By utilizing the water-resistance imparting agent layer as an overcoat, the adhesion of the surface-treated layer is maintained (prevention of peeling) when the substrate is cast, and the isocyanate group-terminated urethane prepolymer is contained in the hydraulic admixture. Water absorption and swelling due to alkali water and moisture in the ground (soil) can be more sufficiently compatible.

The surface treating agent of the present invention contains an isocyanate group-terminated urethane prepolymer or an isocyanate group-terminated urethane prepolymer and a solvent as essential components. These may be used alone, respectively.
Two or more kinds may be used in combination. Hereinafter, essential components in the surface treatment agent of the present invention will be described.

The isocyanate group-terminated urethane prepolymer constituting the surface treating agent of the present invention is a polyether polyol (a) and / or a polyester polyol (b).
And the organic polyisocyanate (c) as essential components. These (a), (b) and (c) may be used alone or in combination of two or more. In the present invention, the isocyanate group-terminated urethane prepolymer swells by absorbing water. For example, it is preferable that the isocyanate group-terminated urethane prepolymer is a polymer having a water absorption ratio (water absorption swelling ratio) of 3 times or more with respect to its own weight. .

The polyether polyol (a) is not particularly restricted but includes, for example, at least one selected from the group consisting of low molecular polyols, polyhydric phenols and amines, one or more alkylene oxides. And alkylene oxide ring-opened polymers. Examples of the addition form of the polyether polyol (a) include, for example,
It is not particularly limited, such as a block shape and a random shape.

Examples of the low molecular polyol include, for example,
Bifunctional polyols such as ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, and cyclohexylene glycol; and trifunctional or higher polyols such as glycerin, trimethylolpropane, pentaerythritol, sorbitol, and souce, and the like. As the polyhydric phenols, for example,
Examples of the amines include alkanolamines such as triethanolamine and N-methyldiethanolamine; aliphatic polyamines such as ethylenediamine and diethylenetriamine; aromatic diamines such as tolylenediamine and diphenylmethanediamine. And the like.

Examples of the above-mentioned alkylene oxide include alkylene oxides having 2 to 4 carbon atoms such as ethylene oxide, propylene oxide and butylene oxide. Examples of the ring-opened polymer of the alkylene oxide include polytetramethylene ether glycol formed by ring-opening polymerization and hydrolysis of tetrahydrofuran.

The average hydroxyl equivalent of the polyether polyol (a) is not particularly limited.
It is preferably 4000. If it is less than 800,
The expansion coefficient may not be sufficient, and if it exceeds 4000, the shape retention at the time of water absorption and swelling may be reduced. More preferably, it is 1000-3000.

Among the above polyether polyols (a), preferred are ethylene oxide adducts of polyhydric alcohols such as ethylene glycol, propylene glycol and glycerin (polyoxyethylene polyols), and / or ethylene oxide and propylene oxide. [Oxyethylene / oxypropylene copolymer polyether polyol (copolyether polyol)]. More preferably, it is a copolymerized polyether polyol. In addition, other than these, other polyether polyols, for example, polyoxypropylene polyol, etc. can be used in combination.

The polyether polyol (a) preferably has an oxyethylene group content of 30% by weight or more. That is, the weight of ethylene oxide is preferably 30% by weight or more based on 100% by weight of the total weight of all alkylene oxides forming the polyether polyol (a). Thereby, the water absorption swelling ratio of the isocyanate group-terminated urethane prepolymer is increased, and the effect of the present invention can be more sufficiently exerted.

The polyester polyol (b) of the present invention
Is not particularly limited as long as it is a known polyester polyol produced from a dibasic acid and a diol or a dibasic acid anhydride and an oxyalkylene compound.Examples of the dibasic acid include succinic acid and adipic acid. Diols such as aliphatic dibasic acids, phthalic acid, aromatic dibasic acids such as terephthalic acid, etc.
4-butanediol, 1,6-hexanediol, propylene glycol, neopentyl glycol, and the like can be mentioned, and these dibasic acids and diols can be combined and reacted (under an OH group excess condition, a terminal OH group is used). Is obtained by In order for the urethane after the reaction to have water absorption, it is preferable that the polyester polyol also has high hydrophilicity.As the dibasic acid, an aliphatic dibasic acid is more preferable than an aromatic dibasic acid, and a carbon such as adipic acid is also used. Those having a small number are preferred, and the diol is preferably ethylene glycol or the like.

The organic polyisocyanate (c) is not particularly restricted but includes, for example, aliphatic polyisocyanates and aromatic polyisocyanates. The aliphatic polyisocyanate is a polyisocyanate in which all isocyanate groups are bonded to non-aromatic hydrocarbon atoms, and is, for example, an aliphatic group having 2 to 12 carbon atoms (excluding carbon in the isocyanate group). Examples include polyisocyanates, alicyclic polyisocyanates having 4 to 15 carbon atoms, araliphatic (aliphatic having aromatic nuclei) polyisocyanates having 8 to 12 carbon atoms, and modified products of these polyisocyanates. Examples of the modified product include a modified product having a carbodiimide group, a uretdione group, a uretoimine group, a urea group, a buret group, and / or an isocyanurate group.

Specific chemical names of the above-mentioned aliphatic polyisocyanates include, for example, ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, 1,6,11-undecane triisocyanate, , 2,4-trimethylhexanediisocyanate, lysine diisocyanate, 2,6-diisocyanatomethylcaproate, bis (2-isocyanatoethyl) fumarate, bis (2-isocyanatoethyl) carbonate, 2-isocyanatoethyl-2,6- Diisocyanate hexanoate; isophorone diisocyanate (IPDl), dicyclohexylmethane diisocyanate (hydrogenated MDl), cyclohexylene diisocyanate, methylcyclohexane Silylene diisocyanate (hydrogenated TDI), bis (2-isocyanatoethyl) 4-cyclohexene-1,2-dicarboxylate; xylylene diisocyanate, diethylbenzene diisocyanate; water-modified HDI, trimerized IPDI, and the like. . Among them, HDI, IPDI or hydrogenated MD
Preferably, I is used.

The aromatic polyisocyanate is a polyisocyanate in which all isocyanate groups are bonded to aromatic hydrocarbon atoms. Specific chemical names include, for example, tolylene diisocyanate (TD)
I), 4,4'-diphenylmethane diisocyanate (TDI), crude MDI, and MDI modified to have a carbodiimide group, uretdione group, uretonimine group and the like as described in JP-B-55-27098. Is mentioned. Among these, TDI or M
Preferably, DI is used.

The isocyanate group-terminated urethane prepolymer is produced in one step by reacting (1) the polyether polyol (a) and / or the polyester polyol (b) with the organic polyisocyanate (c). Production form, (2) aliphatic polyisocyanate and excess polyether polyol (a) and / or
Alternatively, after obtaining a hydroxyl group-terminated urethane prepolymer from the polyester polyol (b), an aromatic polyisocyanate is reacted to produce a two-stage production. In the mode (2), an aliphatic group derived from an aliphatic polyisocyanate is bonded to an NH group of a urethane bond, and an isocyanate group-terminated urethane prepolymer having an isocyanate group derived from an aromatic polyisocyanate can be obtained. become.

In the embodiment (1), the polyether polyol (a) and / or the polyester polyol (b)
The molar ratio (NCO / OH ratio) between the isocyanate group and the hydroxyl group in the organic polyisocyanate (c) is preferably, for example, 1.4 / 1 to 3/1. If it is less than 1.4 / 1, the adhesion of the surface treatment layer to the substrate surface may not be sufficient, and if it exceeds 3/1, the water absorption swelling rate may not be sufficient. More preferably, it is 1.6 / 1 to 2.5 / 1. The reaction conditions are preferably, for example, a reaction temperature of 60 to 100 ° C. and a reaction time of 4 to 12 hours. More preferably, the temperature is set to 70 to 90 ° C. for 6 to 10 hours.

In the above embodiment (2), when obtaining a hydroxyl group-terminated urethane prepolymer, the molar ratio (NCO / OH ratio) between the isocyanate group and the hydroxyl group is set to 1 / 1.2 to 1/8. preferable. More preferably, 1 / 1.5 to 1
/ 4. If it exceeds 1 / 1.2, the hydroxyl group-terminated urethane prepolymer will have a high viscosity and may be difficult to handle. If it is less than 1/8, the alkali resistance may decrease. In this case, the reaction temperature is 60-130.
C. and the reaction time is preferably 4 to 20 hours. More preferably, the temperature is set to 70 to 120 ° C. for 6 to 15 hours. The amount of the solvent used is preferably, for example, 0 to 120 parts by weight based on 100 parts by weight of the urethane prepolymer having a hydroxyl group. More preferably, it is 10 to 80 parts by weight. As the average hydroxyl equivalent of the obtained hydroxyl-terminated urethane prepolymer,
For example, it is preferably 900 to 25000. More preferably, it is 1300-9300.

In the embodiment (2), the molar ratio of the isocyanate group to the hydroxyl group (NCO /
The OH ratio is preferably, for example, 1.4 / 1 to 3/1. More preferably, 1.6 / 1 to 2.5
/ 1. The reaction conditions between the hydroxyl-terminated urethane prepolymer and the aromatic polyisocyanate include, for example, a reaction temperature of 60 to 100 ° C. and a reaction time of 4 to 100 ° C.
It is preferably 12 hours. More preferably, 70
To 90 ° C. for 6 to 10 hours.

The reaction for obtaining the urethane prepolymer terminated with isocyanate groups can be carried out in a solvent. As the solvent, for example, a polar solvent having no active hydrogen is preferably used. For example, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone; etherified or esterified cellosolves such as dimethyl cellosolve and methyl cellosolve acetate; One or more kinds of solvents and the like can be used. The amount of the solvent used is preferably 0 to 70 parts by weight based on 100 parts by weight of the total of (a) and / or (b) and (c). More preferably, it is 0 to 50 parts by weight.

In order to make the above reaction proceed, the reaction can be carried out in the presence of a catalyst. As such a catalyst, a conventionally known catalyst that generally promotes the reaction between an isocyanate group and an active hydrogen compound can be used, and examples thereof include organic metal catalysts such as dibutyltin dilaurate, lead octylate, and stannas octoate. And one or more of tertiary amine compounds such as triethylenediamine.

The above isocyanate group-terminated urethane prep
The NCO% of the rimer should be 0.05-7%
Is preferred. More preferably, it is 0.1 to 4%. Up
The isocyanate group-terminated urethane according to the embodiment (2)
In the case of repolymers, the aliphatic poly
Mole of lysocyanate and aromatic polyisocyanate
The ratio should be, for example, 1 / 0.7 to 1/20
Is preferred. More preferably, it is 1 / 0.8 to 1/9.
You. Also, isocyanate group-terminated urethane prepolymer
Concentration of urethane bond to aliphatic group in solid content of
For example, 2.5 × 10^-Five~ 1.0 × 10^-3mol
/ G. More preferably, 7.0 ×
10^-Five~ 6.5 × 10^-1mol / g. Aromatic nuclei
As the combined urethane bond concentration, for example, 5.5 × 1
0^-Five~ 3.0 × 10^-3mol / g is preferred
No. More preferably, 1.5 × 10^-Four~ 2.0 × 10 ^-3
mol / g.

In the present invention, if necessary, another isocyanate group-terminated urethane prepolymer may be used in combination. Other isocyanate group-terminated urethane prepolymers include, for example, isocyanate group-terminated urethane prepolymers described in JP-A-58-39088. It is preferable to use 20% by weight or more of the isocyanate group-terminated urethane prepolymer in the present invention. More preferably, it is 50% by weight or more.

The surface treating agent of the present invention contains a solvent as an essential component if necessary. As the solvent,
It is preferable that the surface treatment agent of the present invention does not inhibit formation of a surface treatment layer on the substrate surface by moisture curing, and can be used, for example, in the above-mentioned reaction for obtaining an isocyanate group-terminated urethane prepolymer. And the like. In the present invention, when a solvent is used, the viscosity of the surface treating agent becomes low, and spray coating or the like is also possible, so that the coating operation becomes easy.

In addition to the above-mentioned essential components, other additives (d) such as other resins, pigments, various stabilizers, various fillers, etc. are added to the surface treating agent of the present invention, as long as the function and effect are not impaired. May or may not be included. For example, for the purpose of coloring, mixing a pigment, so that it is easy to determine that the surface treatment layer is formed,
If necessary, various additives for other uses may be mixed.

All components constituting the surface treating agent of the present invention 10
The weight ratio of the total amount of the essential components to 0% by weight is preferably, for example, 50% by weight or more based on 100% by weight of the surface treatment agent. If it is less than 50% by weight, the function and effect of the present invention may be impaired. More preferably, it is 70% by weight or more, and particularly preferably,
80% by weight or more.

The weight ratio of each component in the surface treatment agent of the present invention is not particularly limited. For example, in order to reliably exert the effects of the surface treatment agent of the present invention, for example, an isocyanate group-terminated urethane prepolymer 100
The solvent is preferably used in an amount of 0 to 235 parts by weight based on part by weight. More preferably, it is 0 to 100 parts by weight.

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.

The method for applying the surface treating agent of the present invention includes:
There is no particular limitation, and for example, a commonly used coating method of a paint can be used.Specifically, the paint may be applied using a brush, a roller, or the like, or may be applied by spraying using a spray device. Good. In addition, it is applied to the surface of the substrate or the sheet so as to correspond to a portion (place) where the adhesion between the surface of the substrate and the hydraulic admixture is to be prevented, but may be applied to other portions. 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 treatment agent of the present invention undergoes moisture curing when forming the surface treatment layer. However, the curing conditions are not particularly limited. For example, the curing condition is 5 at room temperature (25 ° C.).
It is preferable to set the time to 2 days. 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 surface of the substrate by the surface treatment agent of the present invention. By applying a water resistance imparting agent as a top coat (top coat) on the surface treatment layer, A property imparting agent layer can be formed. Thereby, for example, when storing the base material,
The isocyanate group-terminated urethane prepolymer cured product swells by absorbing rain, night dew, moisture from the ground, etc.
It is possible to suppress that the effect cannot be sufficiently exerted in the hydraulic admixture or in the ground, and to further suppress the decrease in the adhesion between the substrate surface and the surface treatment layer. It becomes possible. In other words, in the construction of the ground substructure, etc., the adhesion of the surface treatment layer is maintained (prevention of peeling) and the cured isocyanate group-terminated urethane prepolymer is hydraulically admixed, both during storage and during the storage of the base material. Water absorption and swelling due to alkaline water in the ground and water in the ground can be more sufficiently compatible.

As the above-mentioned water-resistance imparting agent, a water-resistance imparting agent layer capable of preventing the cured isocyanate group-terminated urethane prepolymer in the surface treatment layer from swelling before exerting its function is formed. Is not particularly limited, as long as it can produce, for example, (meth) acrylate copolymer, polyurethane, polyester, polycarbonate; styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene / butylene-styrene block Copolymer (SEBS), styrene-ethylene / propylene-styrene block copolymer (SEP)
S) or one or two of thermoplastic elastomers such as styrene-isoprene-styrene block copolymer (SIS) and the like.
Mixtures of more than one kind, and conventionally known water repellents such as waxes and silicone water repellents can be used. The method for applying the water resistance imparting agent can be the same as the method for applying the surface treatment agent described above. In this case, about 50 g / m ² is sufficient as the adhesion amount of the water resistance imparting agent, 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 a substrate surface of a buried object and the ground (soil), a method of reducing the friction between the substrate surface of a buried object and the ground (soil),
The method for preventing the soil from adhering to a buried object that suppresses adhesion between the buried object and the buried object according to the preferred embodiment of the present invention is also used for various foundation works and the like. This is an effective method for improving the efficiency in. These methods of preventing adhesion of a buried object, reducing friction of the buried object, and preventing soil from adhering to a 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. In addition, when used as a friction reducing agent, there is no particular limitation as long as it is a substrate or a substrate used in underground structures, a latent box method or a propulsion method, pipes such as steel pipes and fume pipes, steel sheet piles, corrugated sheets, Piles such as H-section steel, I-section steel, steel pipe piles, iron columns, concrete piles, poles,
Various tanks, water storage tanks, and the like used in the latent box method are exemplified. Further, 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 for forming a retaining wall and the like. Examples include piles such as steel, I-section steel, steel pipe piles, iron columns, and the like.

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 the drawings. 1 to 4 are conceptual cross-sectional views illustrating an embodiment of the surface treatment agent of the present invention used as a hydraulic admixture adhesion inhibitor. FIG. 1 shows a conceptual cross-sectional view of a part of a buried object 1 embedded in a hydraulic mixture 2 in the vicinity of a substrate surface. In FIG. 1 (1), the hydraulic admixture 2 contains alkaline water and is in a state where hydration has not progressed, and the surface treatment layer 3 is in a state where the alkaline water has not absorbed water sufficiently. In this state, the hydration of the hydraulic admixture 2 progresses and the water-absorbing swelling of the cured isocyanate group-terminated urethane prepolymer in the surface treatment layer 3 progresses. In (3), the hydraulic admixture 2 When the hydration is completed, the cured product of the isocyanate-terminated urethane prepolymer that has swollen with water is dried and the water-soluble admixture 2 is hydrated with the surface treatment layer 3.
Is a state in which a gap is formed between them. In this way, the gap formed as shown in FIG. 1 (3) suppresses the adhesion between the substrate surface and the hydraulic admixture 2, and the embedded object 1 is replaced by the hydrate of the hydraulic admixture 2. Can be easily removed. Further, even when the embedded object 1 is removed from the hydraulic admixture 2 in the state shown in (2), the presence of the water-absorbed and swollen surface treatment layer 3 between the embedded object 1 and the hydraulic admixture 2 allows 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 1, and a surface treatment agent is applied to the surface of the base material of the buried object 1 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 1, the hydraulic admixture 2 is poured around the buried object 1. Alternatively, the embedding can be performed by embedding the buried object 1 in the hydraulic admixture 2 cast in the excavation hole. In such a ground foundation structure, an operation of removing the buried object 1 from the hydraulic admixture 2 and its hydrate is performed.

The ground foundation structure shown in FIGS. 2 (2) and 2 (3) is formed of a hydraulic admixture 2 and a tubular buried object 1a.
A surface treatment agent is applied to the surface of the base material at the upper part (pile head) on the inner surface of the buried object 1a prior to 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 1a 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 separating the hydrate of the hydraulic admixture 2 from the pile head 2a on the inner surface of the buried object 1a is performed. It will be provided for construction. 2 (1) to 2 (3) show a state in which the isocyanate group-terminated urethane prepolymer cured product in the surface treatment layer 3 has swollen with 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-swelling rate of the cured isocyanate group-terminated urethane prepolymer is large near the surface of the surface treatment layer 3. In some cases, the size of the isocyanate group-terminated urethane prepolymer, which is close to the surface of the base material, gradually swells with water. That is, in the present invention, when the isocyanate group-terminated urethane prepolymer cured product present in the surface treatment layer 3 swells by water absorption, a part thereof may be in a state of water absorption and swelling, and the whole is in a state of water absorption and swelling. You may. In addition, the conceptual diagram shows that the thickness of the surface treatment layer 3 is larger when swelling by water absorption than when it is dried, but when the cured product of the isocyanate group-terminated urethane prepolymer swells by water, the water swelling ratio is increased. Is several times to several tens times or more, and the thickness of the surface treatment layer 3 is actually several times to several tens times or more when swelling with water when dry. The same applies to 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 a member constituting the earth retaining wall and the backfill material, the earth retaining wall or the earth retaining wall is formed by swelling of the cured isocyanate group-terminated urethane prepolymer. Since it is possible to prevent the adhesion between the member and the backfill material, and to prevent the separation of the surface treatment layer on the retaining wall or the member constituting the retaining wall, the method for constructing such an underground structure can be used. This also makes it possible to improve the efficiency of foundation works 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 1b such as a steel sheet pile with the surface treatment agent of the present invention, and the construction member 1b 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 placed in the excavated ground 4, backfilled with a cement-based backfill material 2 b, and further backfilled with a backfill material 6 such as soil used as necessary. The construction member 1b, 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 1b such as a steel sheet pile, the construction member 1b such as the steel sheet pile constituting the retaining wall can be easily built into the ground or pulled out from the ground and removed. 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 1c on which the surface treatment layer 3 is formed, the movable mold 1c is slid over the existing hydraulically hardened compound 2c that has been cast and hardened, and then a new form is generated. A hydraulic admixture 2d is newly placed in the space. Thus, by the surface treatment layer 3 in the movable mold 1c,
Since the adhesion between the movable mold and the hydraulic admixture is suppressed, and the swollen cured isocyanate group-terminated urethane prepolymer exhibits a wetting effect, the movable mold can be easily slid. It becomes easy to construct a hydraulic admixture structure by inheriting the hydraulic admixture.

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, according to the present invention, in any of the casting methods, the effect of the isocyanate group-terminated urethane prepolymer cured product can be exerted without the entire surface treatment layer being peeled off from the substrate surface. The frictional force between the surface of the base material and the ground (soil) can be reduced while minimizing the influence on the ground, and the speed and efficiency of the 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 the isocyanate-terminated urethane prepolymer cured by water absorption and swelling by gradually absorbing water in the ground (soil) from the isocyanate-terminated urethane prepolymer in the surface layer of the surface treatment layer. Is a property of gradually supplying a wet gel layer having the following properties to the surface in contact with the ground (soil). In this case, a wet gel layer will be formed on the surface layer in the surface treatment layer, and the wet gel layer functions as a lubricant, and the adhesion of the water-swelled isocyanate group-terminated urethane prepolymer cured product decreases. When a frictional force is generated between the ground and the ground due to this, 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 controlled release can be adjusted by appropriately setting the hydrophilicity of the isocyanate group-terminated urethane prepolymer. 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 1 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 1 (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 1 is driven into the soil (day 1), a frictional force is generated between the base material surface of the buried object 1 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 1 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 also functions as a lubricant and the surface treatment layer 3 It will come off the surface. 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 isocyanate group-terminated urethane prepolymer in the same manner as in the case of using as the friction reducing agent, it is possible to exhibit the soil adhesion preventing ability 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.

[0071]

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 New Pole PE75 [trade name, manufactured by Sanyo Chemical Industries, Ltd., polypropylene glycol / polyethylene glycol = 5
0/50 (weight ratio)] to 100 parts of TDI-80
(Trade name, mixing ratio of 2,4-isomer and 2,6-isomer 8
0/20 tolylene diisocyanate) and 20.4 parts [NCO / OH = 2.4 (molar ratio)].
For 8 hours to obtain a urethane prepolymer (1) having an NCO% of 3.5%.

Example 1 and Comparative Example 1 1 kg of the urethane prepolymer (1) obtained in Production Example 1 was applied to a steel plate having a thickness of 3 mm, a width of 30 mm and a length of 300 mm.
/ M ² , and reacted at room temperature for 18 hours to produce a steel plate (1) for cement friction cut test. Next, a polypropylene cylindrical milk container having a diameter of 80 mm and a height of 250 mm was filled with a cement milk having the composition described in Table 1 to a height of 150 mm, and the steel plate (1) for cement friction cut test and nothing were applied thereto. The blank steel sheet was erected vertically and cured at room temperature (about 20 ° C.) for 7 days. After hardening for 7 days, the steel sheet was manually pulled out using only a 490N spring and the pulling force was measured. Table 2 summarizes the results.

[0074]

[Table 1]

[0075]

[Table 2] Example 2 and Comparative Example 2 The urethane prepolymer (1) produced in Production Example 1 was coated on a 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 to a thickness of 200 μm. It was brushed evenly. After the reaction at room temperature for 12 hours, the coating film had sufficient strength, and even when strongly rubbed with an iron spatula, the coating film was slightly peeled off. The steel pipe coated with the urethane prepolymer (1) thus obtained was first 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. Next, this steel pipe is erected vertically on the ground on our site (Suita City, Osaka Prefecture), and the thickness is 3 mm, 60 mm × 60 m on the steel pipe.
m with a 500g hammer from the top
From the height of m, the steel pipe was driven into the soil by hitting 10 times. Table 3 shows the depth cast from the ground surface at this time. Further, the steel pipe was allowed to stand for one day, and the next day, first, about 500 ml of ion-exchanged water was applied to the surface (both inside and outside) of the steel pipe and allowed to stand for about 10 minutes. The steel pipe surface after leaving
It was slimy covered with the 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, the depth of the casting from the surface is shown in Table 3. Further, the steel pipe was left for one day, and was driven by the same operation as the second day.
Table 3 shows the depth cast from the ground surface.

[0076]

[Table 3]

The depth cast from the ground surface in the above experiment was significantly larger than that without the urethane prepolymer (1) applied over 3 days (Comparative Example 2), and the depth changed little over 3 days. There was no. From these results, it can be seen that by applying the urethane prepolymer (1) of the present invention to the surface of the substrate, the friction-reducing agent layer was supplied to the surface of the substrate over three days, and the friction-reducing effect was exhibited. You can see that.

Example 3 and Comparative Example 3 0.5 kg / m ² of the urethane prepolymer (1) produced in Production Example 1 was added to the lower 7.5 m (both front and back) of an IV-type steel sheet pile having a length of 8.1 m. It was brush-coated uniformly with the applied amount, and reacted at an outside temperature (10 ± 5 ° C.) for 18 hours to obtain a steel sheet pile (1) for preventing soil adhesion of the present invention. The coating film after the reaction had sufficient strength, and peeled off only slightly even when strongly rubbed with an iron spatula. The thus obtained steel sheet pile (1) for preventing soil adhesion and the uncoated steel sheet pile (the lower part 7.5 m of an IV-type steel sheet pile having a length of 8.1 m) of the present invention (Comparative Example 3) were obtained by using a vibro. Buried in the soil of Shinagawa-ku, Tokyo (silt layer)
Extraction was also performed using a vibro. Steel sheet pile for preventing soil adhesion after drawing (1) and uncoated steel sheet pile (Comparative Example 3)
Table 4 summarizes the adhesion of the soil and the paint for soil adhesion inhibitor (1).

[0079]

[Table 4]

As can be seen from Table 4, the steel sheet pile (1) for preventing the adhesion of soil after the drawing was almost completely coated between the soil and the urethane prepolymer (1) coating film. Almost no water was observed, indicating that the soil adhesion preventing ability was very good.

[0081]

Since the surface treating agent of the present invention has the above-mentioned constitution, it forms a surface treatment layer which is firmly adhered to the surface of the base material, thereby forming an adhesion between the surface of the base material and the hydraulic admixture. Hydraulic admixture adhesion inhibitor which suppresses, friction reducing agent which reduces friction between substrate surface and ground (soil), or soil (soil) between substrate surface and ground (soil) Since it can be used as a soil adhesion preventive agent that suppresses adhesion, it is effective for suppressing the cost of foundation work and the like, for completing the construction quickly, and for protecting 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.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 buried object 1a tubular buried object 1b construction member such as steel sheet pile 1c movable mold 2 hydraulic set 2a pile head 2b cement-based backfill 2c existing hydraulic set 2d newly cast Hydraulic admixture 3 Surface treatment layer 4 Ground 5 Underground buried material 6 Backfill material such as soil used as necessary

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akira Hattori 4-1-1, Koraibashi, Chuo-ku, Osaka-shi, Osaka F-term in Nippon Shokubai Co., Ltd. 4J034 BA07 CE01 DF01 DF16 DF20 DF22 DG03 DG04 DG06 DG15 DG16 DL03 HC03 HC16 HC17 HC22 HC46 HC52 HC61 HC64 HC71 HC73 JA42 LA08 LA33 QB12 QC05 RA19 4J038 DG111 DG131 DG271 DG281 DG291 GA11 KA06 NA09 NA10 PB05 PC04

Claims (4)

[Claims] 1. An isocyanate-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c), or the isocyanate-terminated urethane prepolymer And a surface treating agent containing a solvent as an essential component, and by being applied to the surface of the base material, to be used as a hydraulic admixture adhesion inhibitor that suppresses adhesion between the base material surface and the hydraulic admixture. Characteristic surface treatment agent. 2. An isocyanate-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c), or the isocyanate-terminated urethane prepolymer And a surface treatment agent containing a solvent as an essential component, wherein the surface treatment agent is used as a friction reducing agent that reduces friction between the substrate surface and the ground (soil) by being applied to the substrate surface. Processing agent. 3. An isocyanate group-terminated urethane prepolymer obtained by essentially reacting a polyether polyol (a) and / or a polyester polyol (b) with an organic polyisocyanate (c), or the isocyanate group-terminated urethane prepolymer And a surface treatment agent containing a solvent as an essential component, characterized in that it is used as a soil adhesion preventive agent that is applied to the surface of the base material to suppress the adhesion between the base material surface and the ground (soil). Surface treatment agent. 4. The polyether polyol (a),
4. The surface treating agent according to claim 1, wherein the oxyethylene group content is 30% by weight or more.