JP4282506B2 - Sheets for civil engineering and construction - Google Patents

Description

The present invention relates to a civil engineering / architectural sheet material. More specifically, the present invention relates to a civil engineering / architecture sheet-like material that can improve the work of pulling out steel materials in foundation work and the like and can sufficiently cope with a special case in the civil engineering / architectural field.

When building structures such as retaining retaining walls in the ground in foundation work in the construction or civil engineering fields, a method of directly burying steel materials (supports) such as steel sheet piles in the ground is generally used. ing. And after embedding steel sheet piles etc. in the ground, if necessary, hydraulic composition such as cement milk or ready-mixed concrete is pressed into the ground, or excavation holes are formed and the hydraulic composition is injected into the H-shaped steel. Is embedded as a steel material (core material). In addition, whether to use a hydraulic composition is determined according to the surrounding groundwater condition which performs foundation construction.
Steel materials used for such foundation work are not used for the leased land or to prevent any obstacles in the construction (development) of the basement in later years, and to reuse the steel materials from the ground. Although it is desired to be pulled out, considerable work (tensile force) is required for the work of pulling out the steel material from the ground or the hydraulic composition.
Also, at the site of foundation work, soil adheres when the steel material is pulled out from the ground, so the surface of the steel material is usually in a state where rust or dirt adheres. Since the effectiveness of the material and the like cannot be fully exhibited, an operation of sufficiently washing the steel material is required before using the steel material. However, it is difficult to sufficiently remove rust and dirt, and since it is a complicated operation, steel materials are often reused in a state where rust and dirt are attached.

The following prior art is disclosed regarding the technique for improving the conventional drawing operation.
That is, a covering material is disclosed in which a resin layer containing a specific alkaline water-soluble resin and a water-absorbing material is formed on a sheet-like substrate (see, for example, Patent Document 1). This coating material forms a swollen water-absorbing material layer between the steel material and the cured product of the hydraulic composition to sufficiently suppress the adhesion between them, and when the steel material is pulled out, the swollen water-absorbing material is lubricated. Since the steel material can be easily slipped by exhibiting the effect, the tensile force of the steel material from the cured product of the hydraulic composition can be reduced, and the workability of the drawing work can be improved. By applying this technique, a friction cutter sheet (registered trademark, FRC sheet) has been developed, and it is possible to easily and efficiently work. However, when using this sheet, since it is currently affixed to the steel surface using a solvent-type adhesive, the affixing work at the factory or the site is made easier than before and the working environment is improved. However, there was room for further improvement. In addition, it can be applied to steel surfaces with much rust and dirt attached, and if the cleaning work before using the steel material cannot be performed sufficiently, the rust can be removed sufficiently by the cleaning work. Even when it is not possible, there is room for improvement in order to make it more suitable for use.

The applicant of the present application has also found a covering material in which a lubricant layer and an adhesive layer having a specific coating film peeling strength are formed on a sheet base material (Japanese Patent Application No. 2002-214323). This is because by attaching the coating material to the steel surface with an adhesive layer, a lubricant layer is easily formed on the surface of the steel material to improve workability and to prevent the coating material from peeling off from the steel material sufficiently. This makes it possible to easily pull out the steel material from the steel, and is useful for improving the steel material drawing work. However, in this coating material, since the adhesive usually exhibits an adhesive action in a liquid state by immersing it in a solvent before use, the pasting operation is made easier and more efficient, and the working environment is further improved. In addition, there is room for contrivance to sufficiently cope with steel materials to which a lot of rust, dirt, etc. are adhered. In addition, there is room for improvement in order to further improve the workability when pulling out the steel material.

Further, a water-absorbing lubricating tape having an adhesive surface on the back surface and a wet lubricating layer obtained by kneading a water-absorbing polymer and a re-wettable binder on the front and back surfaces to dry and solidify is disclosed (for example, see Patent Document 2). However, in this water-absorbing lubricating tape, it is not described that the steel material to which rust or dirt adheres also has an adhesive action, and not only a smooth surface without dirt but also a lot of rust and dirt adhere to it. There was room to devise in order to be able to cope with special cases in the civil engineering / architecture field by exhibiting sufficient adhesive strength on the steel surface.
On the other hand, regarding a conventional adhesive tape, a patch (see, for example, Patent Document 3) having a backing support layer and an adhesive layer having a specific glass transition temperature, an adhesive layer for fixing, a specific molecular weight, and a glass transition. A double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer for expanded polystyrene having temperature (see, for example, Patent Document 4) is disclosed. However, these patches are particularly suitable for foundation work in the civil engineering and construction fields where high adhesive strength is desired because they are intended to be applied to human skin and heat insulating materials such as houses. There was room for ingenuity to be used.
Japanese Patent No. 3274421 Japanese Examined Patent Publication No. 4-44045 Japanese Patent Laid-Open No. 3-127725 Japanese Patent Laid-Open No. 9-122502

The present invention has been made in view of the above-mentioned present situation, and can make the pasting work in the factory or the field more simple, can improve the working environment, and has a rust and dirt on the surface. It is an object of the present invention to provide a civil engineering / architecture sheet-like material capable of exhibiting sufficient adhesion.

As a result of various studies on civil engineering / architectural sheet materials, the present inventors have found that a sheet having a layer capable of exerting a lubricating effect, such as a friction cutter sheet (registered trademark, FRC sheet), has a steel material and a ground. Attention was first focused on the fact that it is very useful for improving the workability of the drawing work due to the reduced frictional force with the cured product of the hydraulic composition. And, when an adhesive layer is provided on one side of this sheet and made into an adhesive tape, it becomes possible to affix to steel without using a solvent-type adhesive. I thought that it would be even easier and the working environment could be further improved, and when I put a commercially available double-sided tape (adhesive) on the back of the FRC sheet, I put it on a rusted steel material on site, The pressure-sensitive adhesive was put on the surface rust and could not exert a sufficient sticking force. Therefore, using a pressure sensitive adhesive with a specific value on the surface of the base material sprayed with dry soil is sufficient not only for smooth surfaces without dirt, but also for steel surfaces with a lot of rust and dirt. It has been found that the sheet can be used for civil engineering / architecture having a pressure-sensitive adhesive layer containing such a pressure-sensitive adhesive and a lubrication-generating layer, thereby further improving the workability of the drawing work. It has been found that the above-mentioned problems can be solved brilliantly by finding that the pasting work becomes easy, the uneven coating can be sufficiently suppressed, and the work environment can be improved. And when such a pressure-sensitive adhesive layer contains a polymer obtained by using a monomer composition having a glass transition temperature (Tg) of −30 ° C. or lower, the pressure-sensitive adhesive layer has fluidity at room temperature and It has been found that the effects of the present invention can be fully exhibited due to excellent permeability, and the present invention has been achieved.

That is, the present invention is a civil engineering / architectural sheet material having at least a pressure-sensitive adhesive layer and a lubricity-expressing layer, and the pressure-sensitive adhesive layer has a width of 25 mm with respect to the surface of a base material on which dry soil is dispersed. A sheet for civil engineering / architecture of 10 gf or more when the adhesive layer of the sheet-like material is overlapped on a base material to 40 mm, pulled in a 0 degree direction with a tensile tester fixed on both sides, and measured under a load. It is a shape.
The present invention is described in detail below.

The civil engineering / architectural sheet material of the present invention is in the form of a sheet used for civil engineering or architectural applications, and has at least an adhesive layer and a lubricity-expressing layer. In the present invention, by previously forming a pressure-sensitive adhesive layer, a lubricity-expressing layer, etc. on a sheet-like base material, and attaching a sheet-like material in which these layers are integrated to the steel material surface, etc. Since the lubricity-expressing layer can be easily formed without using a solvent-type adhesive, the efficiency of forming the lubricity-expressing layer is improved, and the working environment is more sufficiently improved. In addition, since a uniform lubrication layer can be formed on the surface of the steel, uneven coating that tends to occur when a lubricant (agent) is applied to the steel is suppressed, improving the workability of the steel drawing work. It becomes possible to do.

In such a civil engineering / architecture sheet-like material, the form having the pressure-sensitive adhesive layer and the lubricity-expressing layer includes, for example, a lubricity-expressing layer formed on one side of the sheet-like substrate and the pressure-sensitive adhesive layer on the other side. In which a pressure-sensitive adhesive layer and a lubricity-expressing layer are provided via a base material; a lubricity-expressing layer is formed on both sides of a sheet-like base material, and at least one side thereof is further adhesive A form in which the agent layer is formed in an overlapping manner; a form in which the pressure-sensitive adhesive layer is formed on both surfaces of the sheet-like base material, and a lubricity expressing layer is further formed on at least one surface thereof. Especially, the form with which the adhesive layer and the lubricity expression layer are provided through the sheet-like base material is one of the suitable forms of this invention. In addition, it is suitable for the surface which has an adhesive layer to become a surface which contacts steel materials.

In the present invention, as a method for producing the sheet-like material of the above-described form, the pressure-sensitive adhesive layer is opposite to the surface on which the lubricity-expressing layer is formed using a coater height coater of 10 μm to 5000 μm. It is preferable to include a step of providing the surface. That is, a method for producing a civil engineering / architecture sheet material having at least a pressure-sensitive adhesive layer and a lubricity-expressing layer, wherein the pressure-sensitive adhesive layer is expressed with lubricity using a coater height of 10 μm to 5000 μm. A step of providing on the surface opposite to the surface on which the layer is formed. A manufacturing method in which a layer is piled up to 40 mm on a base material, pulled in a 0 degree direction with a tensile tester in which both layers are fixed, and measured by applying a load is also a preferred embodiment of the present invention. It is. In addition, a sheet-like material manufactured by the step of forming the pressure-sensitive adhesive layer on the surface opposite to the surface on which the lubricity-expressing layer is formed is also a preferred embodiment of the present invention.
In the present invention, it may also be produced by a process in which a lubricity-expressing layer is formed on both surfaces of a sheet-like base material, and an adhesive layer is further stacked on at least one surface thereof. It may be produced by a step of forming a lubricity-expressing layer on the surface opposite to the opposite surface. An adhesive layer is formed on both surfaces of the sheet-like base material, and a lubricity-expressing layer is further formed on at least one surface thereof. You may manufacture by a process.

In the civil engineering / architectural sheet material, the pressure-sensitive adhesive layer is a layer containing a pressure-sensitive adhesive, and is a layer formed in order to sufficiently adhere the steel material and the lubricity-expressing layer. Here, “adhesive” refers to its own adhesive action without the use of a solvent or the like, and the amount of liquid (solvent, etc.) is sufficiently reduced by drying after application to a substrate. Even if it is in a state (for example, the solvent content is 5% by mass or less), it has adhesive strength at room temperature (0 ° C. to 40 ° C.). Therefore, after making it into a liquid state by immersing it in a solvent, etc., the adhesive action is exhibited by volatilizing the solvent, and after adhering to a substrate etc. and drying (after volatilization of the solvent) it should not have adhesive strength The designed “adhesive” is different.
In the present invention, by using a sheet-like material having such a pressure-sensitive adhesive layer, steps such as immersing the sheet in a solvent before application to the steel material can be omitted, and the work of attaching the steel material more It is possible to sufficiently simplify the work environment and further improve the working environment. Further, if desired, a polymer and other additives contained in the adhesive layer in the sheet-like material of the present invention are appropriately selected, and the temperature is lower than the above normal temperature range, for example, in a use region of -30 ° C to 0 ° C. However, it is also possible to design the adhesive force sufficiently.

As the above-mentioned pressure-sensitive adhesive layer, the adhesive strength with the base material surface sprayed with dry soil is a tensile tester in which the pressure-sensitive adhesive layer of the sheet material having a width of 25 mm is superposed on the base material up to 40 mm and both are fixed. It is 10 gf or more when measured by pulling in the 0 degree direction and applying a load. If the adhesive strength is less than 10 gf / 25 mm, there is a possibility that sufficient adhesive strength may not be exerted on the steel material surface to which a lot of rust, dirt, etc. are adhered on site, and workability can be sufficiently improved. It may not be possible. Preferably, it is 100 gf or more, more preferably 150 gf or more, still more preferably 300 gf or more, particularly preferably 600 gf or more, and most preferably 800 gf or more. In addition, the adhesive force of the said adhesive layer is an adhesive force between the adhesive layer of a sheet-like material which has the said adhesive layer, and a base material, 25 degreeC, relative humidity 65%, and the said 25 mm width | variety The adhesive strength when measured by applying a tensile load in the 0 degree direction (that is, in the horizontal direction with respect to the base material) with a tensile tester in which the adhesive layer of the sheet-like material is superimposed on the base material to 40 mm and both are fixed. is there. Further, for example, by designing the glass transition temperature (glass transition temperature calculated from the monomer) of the polymer contained in the pressure-sensitive adhesive layer to be lower, the adhesive strength can be improved as described above. And it can design suitably by the temperature at the time of use of the sheet-like material of this invention, the adhesive force required at the time of use, the state of the surface of steel materials, etc.
In the present invention, by using a pressure-sensitive adhesive layer satisfying such a range, a steel surface having a smooth surface, as well as a steel material having rust or dirt attached to the surface, exhibit sufficient adhesion, and in the civil engineering / architecture field It will be able to cope with special cases in

In addition, as adhesive force with the base-material surface which sprinkled dry soil, it can obtain | require as follows, for example.
As a sample, a pressure sensitive adhesive was uniformly coated on a release paper with an applicator so that the dry adhesion amount was 200 g / m ² , left at room temperature of 25 ° C. for 24 hours, and then dried by heating at 100 ° C. for 2 minutes. Then, the pressure-sensitive adhesive layer adhering to the release paper and one surface of the friction cutter (registered trademark) coating material sheet are bonded and pressure-bonded, and cut into a width of 25 mm × 50 mm. Moreover, Kasaoka clay is used as dry soil, and as a base material (adhered body) on which the dry soil is spread, Kasaoka clay is 60 g / m ² using a 50 mesh (300 μm) sieve on a 70 mm × 70 mm iron plate surface. The release paper on the back side of the sample is peeled off, and a 40 mm long part is attached to the adherend, and a load of 4 kgf is applied for 1 minute from the top of the sheet. Next, using "QC tensile tester TE-2001 type" (trade name, manufactured by Test Sangyo Co., Ltd.), the adherend (iron plate) is fixed to the lower fixing part, and the sample sheet is fixed to the upper fixing part. did. Tensile is performed at 25 ° C. and a relative humidity of 65%, a sample sheet having a width of 25 mm is pulled at a rate of 100 mm / min in the direction of 0 ° (ie, parallel to the iron plate), and the resistance due to adhesion at that time is measured. The resistance force due to the adhesion is defined as the adhesion force to the surface of the base material on which the dry soil is dispersed.

The pressure-sensitive adhesive layer having an adhesive force satisfying the above range is preferably, for example, one containing a polymer obtained using a monomer composition having a very low glass transition temperature (Tg). Due to the fact that the monomer composition has fluidity and permeability at room temperature, it is possible to entrain and stick rust even on the surface of a rusted steel material. The glass transition temperature (Tg) is preferably −30 ° C. or lower. More preferably, it is -40 degrees C or less, More preferably, it is -50 degrees C or less.
The glass transition temperature (Tg) is calculated by the following equation using the glass transition temperature (Tgi, unit: K) of the homopolymer of monomer i and the mass distribution (Wi) of monomer i. The temperature (K) can be calculated by converting to (° C.).
1 / Tg = Σ (Wi / Tgi)

The polymer obtained by using the monomer composition is preferably contained in an amount of 40% by mass or more with respect to 100% by mass of all pressure-sensitive adhesive layer components. If it is less than 40% by mass, there is a possibility that sufficient fluidity and permeability cannot be given to the pressure-sensitive adhesive layer, and there is a possibility that a more sufficient adhesive force cannot be obtained. More preferably, it is 50 mass% or more, More preferably, it is 60 mass% or more, Most preferably, it is 70% or more.
In the civil engineering / architecture sheet material of the present invention, the pressure-sensitive adhesive layer is a monomer composition having a glass transition temperature (Tg) of −30 ° C. or less with respect to 100% by mass of all pressure-sensitive adhesive layer components. It is preferable that the polymer obtained by use contains 40% by mass or more, and such a form is one of the preferred forms of the present invention.

Examples of the monomer composition having a glass transition temperature that can satisfy the above range include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, (meth (Meth) such as cyclohexyl acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate Acrylic acid alkyl ester: unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, etc .: vinyl esters such as vinyl acetate and vinyl propionate: N-vinylpyrrolidone, acryloylmorpholine, etc. N group-containing unsaturated monomer: Unsaturation such as (meth) acrylonitrile Tolyl; unsaturated amides such as (meth) acrylamide, N-methylolacrylamide; polycaprolactone of 2-hydroxyethyl (meth) acrylate, 2-hydroxyprovir (meth) acrylate, 2-hydroxyethyl (meth) acrylate It is preferable to include a modified product (trade name: Plaxel F series (manufactured by Daicel Chemical Industries, Ltd.)) and the like. These can use 1 type (s) or 2 or more types. From the viewpoint of adhesive strength to a surface contaminated with rust or the like, it is preferable to use one or a combination of two or more of those having a glass transition temperature after polymerization of −30 ° C. or lower.

The polymerization method for obtaining the polymer is not particularly limited. For example, a polymerization method using a polymerization initiator such as a radical polymerization initiator: polymerization that irradiates radiation such as ionizing radiation, electron beam, or ultraviolet rays. Method: Various conventionally known methods such as a polymerization method by heating can be employed. Among the above polymerization methods, a method using a radical polymerization initiator used in the production of a normal acrylic pressure-sensitive adhesive is most preferred industrially.
The radical polymerization initiator is not particularly limited, and examples thereof include an organic peroxide polymerization initiator and an azo polymerization initiator. Specific examples of the organic peroxide polymerization initiator include benzoyl peroxide, di-tert-butyl peroxide, cumene hydroperoxide, tert-butyl peroxybenzoate, and the like. Specific examples of the azo polymerization initiator include 2,2′-azobis (2-methylbutyronitrile), 2,2′-azobiscyclohexanecarbonitrile, and the like. Only one type of these polymerization initiators may be used, or two or more types may be conveniently mixed. Moreover, the usage-amount of these polymerization initiators is not specifically limited. Among the above polymerization initiators, the organic peroxide polymerization initiator generates a larger amount of radicals that cause hydrogen abstraction reaction of the (meth) acrylic polymer main chain than the azo polymerization initiator. Since the polymer part derived from the monomer composition can be further grown, it is more preferable.

Among these monomers, it is preferable to make acrylic acid essential, and the content of acrylic acid in that case is 1% by mass or more with respect to 100% by mass of the total mass of the monomer composition. Preferably, it is 5% by mass or more, more preferably 10% by mass or more. Thereby, since an adhesive layer has alkali water solubility, the function as a binder which adhere | attaches the lubricant used for a lubricity expression layer and steel materials can be exhibited. At the same time, since it is possible to give the adhesive layer itself an effect similar to the lubricity expression layer, when the sheet-like material of the present invention using this is applied to a steel material and embedded in the ground, Since an easily peelable layer can be formed between the sheet-like substrate and the ground or hydraulic composition, the labor (tensile force) in the work of pulling out the temporary embedded object from the ground or hydraulic composition is further sufficiently increased. Therefore, the workability of the work can be further improved.
It does not specifically limit as a method of obtaining a polymer using the said monomer composition, It can carry out by well-known methods, such as solution polymerization and block polymerization.
The pressure-sensitive adhesive layer of the present invention preferably contains the above-mentioned polymer, but the adhesive strength with the base material surface sprayed with dry soil is based on the pressure-sensitive adhesive layer of the sheet-like material having a width of 25 mm. It can also be formed using natural rubber as long as it is 10 gf or more when measured by applying a load with a tensile tester in which the material is overlapped to 40 mm and both are fixed.

The pressure-sensitive adhesive layer may also contain a solvent. Examples of the solvent include methyl alcohol, ethyl alcohol, isopropyl alcohol, benzene, toluene, acetone, methyl ethyl ketone, ethyl acetate, butyl acetate; ethylene glycol, ethylene glycol monomethyl One type or two or more types of polyhydric alcohols such as ether, ethylene glycol monomethyl ether acetate, and polypropylene glycol monomethyl ether acetate, and derivatives thereof can be used.
In addition, when a solvent is included, the content thereof is 40% by mass or less with respect to 100% by mass of all the adhesive layer components as the content after the pressure-sensitive adhesive layer is formed on the sheet-like substrate. preferable. If it exceeds 40% by mass, the pressure-sensitive adhesive layer may not be sufficiently formed on the sheet base material, and the effects of the present invention may not be sufficiently exhibited. More preferably, it is 30 mass% or less, More preferably, it is 20 mass% or less, More preferably, it is 10 mass% or less, Especially preferably, it is 5 mass% or less, Most preferably, it is 2 mass% or less.
In the present invention, an embodiment in which the pressure-sensitive adhesive layer has a solvent content of 5% by mass or less with respect to 100% by mass of all the pressure-sensitive adhesive layer components is also one of the preferred embodiments of the present invention.

The pressure-sensitive adhesive layer further includes a crosslinking agent, a plasticizer, a tackifier, an inorganic additive, a filler, a pigment, a diluent, an anti-aging agent, an ultraviolet absorber, and an ultraviolet ray as long as the effects of the present invention are not impaired. Additives such as stabilizers can be included.
In the above additive, examples of the crosslinking agent include tolylene diisocyanate (TDI), naphthylene-1,5-diisocyanate, diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), xylene diisocyanate (XDI). ), Isocyanate-based crosslinking agents such as trimethylolpropane-modified TDI; epoxy-based crosslinking agents such as ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether; N, N-hexamethylene-1 One or two or more of aziridine-based crosslinking agents such as 1,6-bis (1-aziridinecarboxyamide) can be used.
In addition, when using a crosslinking agent, it is suitable to set it as 5 weight part or less with respect to 100 weight part of polymers obtained using the said monomer composition. If it exceeds 5 parts by weight, the pressure-sensitive adhesive layer may not have sufficient flexibility and fluidity. More preferably, it is 0.5 parts by weight or less.

Examples of the plasticizer include phthalate ester plasticizers such as dibutyl phthalate and dioctyl phthalate; sebacic acid ester plasticizers such as dibutyl sebacate; adipate ester plasticizers such as dioctyl adipate; tributyl phosphate and the like. Phosphoric ester plasticizers; Naturally derived glycerin triester plasticizers such as castor oil; Vegetable oils such as olive oil; Citric acid ester plasticizers such as toluethyl citrate; Liquid plasticizers such as liquid polyethers; Rosin ester derivatives (resin-based tackifier) such as isopropyl myristate and compounds having an effect of promoting drug migration such as azone can be used.
In addition, when using a plasticizer, it is suitable to set it as 5 weight part or less with respect to 100 weight part of polymers obtained using the said monomer composition. If the amount exceeds 5 parts by weight, the adhesive strength may not be sufficient, and the effects of the pressure-sensitive adhesive layer may not be sufficiently exhibited. More preferably, it is 0.5 parts by weight or less.

Examples of the tackifier include rosin, rosin ester, terpene, terpene phenol, coumarone, coumarone indene, styrene resin, xylene resin, phenol resin, and petroleum resin. Alternatively, two or more types can be used. When a tackifier is used, 5 to 30 parts by weight of a softening point of 100 to 150 ° C. with respect to 100 parts by weight of the polymer obtained using the monomer composition, Is preferably blended with 5 to 30 parts by weight of 40 to 80 ° C.
Although the addition amount of these tackifiers with respect to the (meth) acrylic polymer is not particularly limited, for example, 0 to 100 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer. A range is preferred. If the addition amount of the tackifier with respect to the (meth) acrylic polymer is more than 100 parts by weight, tack may be reduced and the adhesive force may be lowered, which is not preferable.
As said inorganic additive, 1 type (s) or 2 or more types, such as a silica powder (white carbon) and a fine powder silica (aerosil), can be used, for example.

In the above-mentioned civil engineering / architectural sheet-like material, the lubricity-expressing layer is a layer containing a lubricant and has an effect of suppressing adhesion and friction between the ground or the hydraulic composition and steel. . As the lubricant, for example, water-absorbing resin, water-absorbing fiber, pulp (fiber), cotton, rayon (fiber), wax, grease, paper and the like are preferable, and water-absorbing resin is more preferable.
The water-absorbing resin is preferably a resin that swells by absorbing water and has a water absorption ratio of 3 times or more (25 ° C., 1 hour) with respect to its own weight. Has an absorption ratio of 10 times or more. Examples of such a water-absorbing resin include poly (meth) acrylic acid crosslinked bodies, poly (meth) acrylate crosslinked bodies, poly (meth) acrylic ester crosslinked bodies having sulfonic acid groups, and polyoxyalkylene groups. Poly (meth) acrylic acid ester cross-linked product, poly (meth) acrylamide cross-linked product, copolymer cross-linked product of (meth) acrylate and (meth) acrylamide, hydroxyalkyl (meth) acrylate and (meth) acrylic acid Cross-linked copolymer with salt, cross-linked polydioxolane, cross-linked polyethylene oxide, cross-linked polyvinyl pyrrolidone, sulfonated polystyrene cross-linked product, cross-linked polyvinyl pyridine, saponified starch-poly (meth) acrylonitrile graft copolymer, starch-poly ( (Meth) acrylic acid (salt) graft cross-linked copolymer, polyvinyl Water-soluble or hydrophilic compounds such as reaction products of cole and maleic anhydride (salt), crosslinked polyvinyl alcohol sulfonate, polyvinyl alcohol-acrylic acid graft copolymer, polyisobutylene maleic acid (salt) crosslinked polymer ( Monomer and / or polymer) is a synthetic water-absorbing resin obtained by cross-linking with a cross-linking agent; one or more of natural water-swelling materials such as gelatin and agar are suitable. Among them, it is preferable to use a synthetic water-absorbing resin obtained by crosslinking a water-soluble or hydrophilic compound with a cross-linking agent, thereby improving the balance of swelling ratio, water-soluble content, water absorption speed, strength, and the balance. It is also possible to easily adjust.

A preferred form of the water absorbent resin is a water absorbent resin having a nonionic group and / or a sulfonic acid (salt) group. More preferably, it is a water-absorbing resin having an amide group or a hydroxyalkyl group, such as a copolymer crosslinked product of (meth) acrylate and (meth) acrylamide, hydroxyalkyl (meth) acrylate and (meth) acrylic. Examples thereof include a crosslinked copolymer with an acid salt. Further, as a particularly preferred form, a water-absorbing resin having a polyoxyalkylene group, for example, a copolymer crosslinked product of a (meth) acrylic acid ester having a methoxypolyoxyalkylene group and a (meth) acrylate, etc. Can be mentioned. In these forms, water absorption with respect to alkaline water is improved, but a water absorbent resin having a methoxypolyoxyalkylene group is particularly excellent in this performance.

The water-absorbing resin can be prepared by (co) polymerizing monomer components, but the (co) polymerization method is not particularly limited, and can be performed by a commonly used method. Further, the average molecular weight and shape of the water-absorbent resin, the average particle diameter, and the thickness and the coating amount of the lubricity-expressing layer having such a water-absorbent resin are the composition of the soil and hydraulic composition constituting the ground, What is necessary is just to set suitably according to a working environment, a combination with a sheet-like base material, an adhesive layer, etc., and it does not specifically limit. For example, the average particle size is preferably 1 μm to 1000 μm. If it is less than 1 μm, a fine dust problem will occur and handling will be reduced. On the other hand, if it exceeds 1000 μm, the applicability (coating property) for forming the lubricity-expressing layer is reduced, and the distribution of the water-absorbing resin in the lubricity-expressing layer becomes non-uniform, and the lubrication performance is lowered. More preferably, it is 5 micrometers-500 micrometers, More preferably, they are 10 micrometers-100 micrometers.

In the civil engineering / architectural sheet material of the present invention, as the sheet-like base material, various external forces applied when constructing the ground foundation structure, for example, the tensile force generated by the weight of the steel material or the hydraulic composition is applied. Strength that can withstand impact force and tensile force generated when embedding steel, frictional force with hydraulic composition, etc., that is, strength that does not break even when such external force is applied Any material may be used.
Examples of the material for the sheet-like substrate include paper, wood, split fiber nonwoven fabric, needle punched nonwoven fabric, flat yarn fiber fabric, cotton fabric, hemp fabric, strip fabric, synthetic resin fabric, wet spinning fabric, and the like. These may be used alone or in combination (composite) of two or more. In the above material, if necessary, for example, when the water permeability is not sufficient, cuts and holes may be formed, and the shape, size, number, and formation position of the cuts and holes, What is necessary is just to set in the range which can maintain the intensity | strength which a sheet-like base material does not break even if the external force mentioned above is applied.

The thickness of the sheet-like substrate may be appropriately set according to the material (material), and for example, the lower limit is preferably 0.01 mm and the upper limit is preferably 10 mm. If it exceeds 10 mm, the sheet-like material may not have sufficient flexibility, and the sheet-like material becomes bulky, so that the handling property and storage property may not be sufficient. If it is less than 0.01 mm, the strength that can withstand external force may not be sufficiently maintained. A more preferred lower limit is 0.05 mm and an upper limit is 8 mm, and a still more preferred lower limit is 0.2 mm and an upper limit is 5 mm.
Incidentally, the basis weight of the sheet-like substrate may be appropriately set according to the material and thickness, etc., but for example, the lower limit of 1 g / m ^2, the upper limit is preferably 10000 g / m ^2. A more preferred lower limit is 10 g / m ² and an upper limit is 1000 g / m ² .

Although it does not specifically limit as the tensile strength of the said sheet-like base material, For example, it is preferable that it is 1 kgf / 2.5cm or more. If it is less than 1 kgf / 2.5 cm, the strength that can withstand external force may not be sufficiently maintained. More preferably, it is 10 kgf / 2.5 cm or more, More preferably, it is 30 kgf / 2.5 cm or more.
In addition, as said tensile strength, it can obtain | require as follows, for example.
That is, a sheet-like substrate was cut into a size of 2.5 cm in width and 20 cm in length, and immersed in ion-exchanged water for 30 minutes to obtain a test piece. Using a low-speed extension tensile tester based on the tensile test method (tensile strength), the measurement is performed under the conditions of a tensile speed of 20 mm / min and a gripping interval of 10 cm. In addition, it can be judged that the tensile strength of a sheet-like base material is so large that the measured value (unit: kgf / 2.5cm) obtained by the testing machine is large.

As the shape of the sheet-like base material, at least when the pressure-sensitive adhesive layer and the lubricity-expressing layer are formed to form the sheet-like material of the present invention, the shape and size capable of covering the steel material can be used. Although it is good, for example, a bag shape or a cylindrical shape to which steel can be inserted is preferable. As a result, a large and heavy steel material can be coated with a sheet-like material more easily and quickly, so that the workability at the work site can be further sufficiently improved.

In the civil engineering / architectural sheet-like material of the present invention, as a method of forming at least the pressure-sensitive adhesive layer and the lubricity-expressing layer on the surface of the sheet-like substrate, the lubricant, pressure-sensitive adhesive, and sheet base contained in these layers are used. What is necessary is just to select suitably according to the material of a material, etc. In addition to the manufacturing method of the sheet-like material mentioned above, for example, a lubricant and an adhesive are applied to the surface of a sheet-like substrate by spraying or brushing. Each layer is applied to the surface (outer surface and / or inner surface) of the sheet-like base material by applying a roller, or by impregnating the sheet-like base material with a solution comprising a lubricant or an adhesive. Can be formed.

Further, the film thickness of the layer is not particularly limited as long as it is appropriately set depending on the components and the like. For example, each of the pressure-sensitive adhesive layer and the lubricity-expressing layer has a lower limit of 0.01 mm and an upper limit of 5 mm. Preferably there is. If it exceeds 5 mm, the handleability and storage stability of the sheet-like material may not be sufficient, and if it is less than 0.01 mm, the effects of each layer may not be sufficiently exhibited. In each of these layers, the more preferable lower limit is 0.02 mm and the upper limit is 1 mm, and still more preferable lower limit is 0.05 mm and the upper limit is 0.5 mm.

In the present invention, the term “steel” is used when constructing ground foundation structures such as retaining walls and foundations in foundation work in the civil engineering / architecture field, and in the ground and hydraulic compositions after use. For example, steel pipes, fume pipes, H-shaped steels, I-shaped steels, steel pipe piles, steel pillars, concrete piles, poles, cylindrical piles (base piles that are preferably buried in the ground) can be used. Hollow piles), steel sheet piles (sheet piles) that are long plate-like piles, corrugated sheets, tanks, water storage tanks and the like. In addition, the shape, length, material, surface roughness, etc. of the steel material are not particularly limited, even if the surface is rusted or soiled, or has a smooth surface free of soiling. Although it is good, the effect of the present invention can be more fully exhibited by using a steel material with rust or dirt on the surface.

Since the civil engineering / architectural sheet material of the present invention has the above-described configuration, it is possible to simplify the pasting work in the factory or the field, improve the working environment, and rust on the surface. It is possible to exhibit sufficient adhesion even to steel materials to which dirt or dirt adheres, and to sufficiently handle special cases in the civil engineering and construction fields.

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples. Unless otherwise specified, “part” means “part by weight” and “%” means “mass%”.

(Production Example 1)
In a four-necked flask equipped with a thermometer, stirrer, nitrogen gas inlet tube, reflux condenser and dropping funnel, 45.9 parts of butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA) 22.8 40 parts of a monomer mixture composed of 25 parts of vinyl acetate (VAc) and 6 parts of acrylic acid (AA) and 40 parts of ethyl acetate were added to raise the temperature to 84 ° C. By the way, 0.04 part of a peroxide-based initiator (trade name “NIPER BMT-K40”, manufactured by NOF Corporation) was added to initiate polymerization. After 10 minutes from the start of polymerization, 60 parts of the remaining monomer mixture, 40 parts of ethyl acetate and 0.06 part of Nyper BMT-K40 were uniformly added dropwise over 90 minutes. Polymerization continued at reflux temperature. 90 minutes after the completion of the dropping of the monomer, 0.3 part of an azo polymerization initiator (trade name “ABN-E”, manufactured by Nippon Hydrazine Kogyo Co., Ltd.) and 50 parts of toluene are added as an initiator for addition. The reaction was terminated by aging for 90 minutes to obtain an adhesive (1).

(Production Example 2 and Production Example 3)
A pressure-sensitive adhesive (2) and a pressure-sensitive adhesive (3) were obtained in the same manner as in Production Example 1 except that the monomer composition was changed as shown in Table 1.
Moreover, the alkali-soluble resin and the water-absorbing resin used for the lubricity-expressing layer of the present invention were produced or used in the following procedure. Further, the following materials were used as the sheet-like substrate.

[Alkaline water-soluble resin]
The alkaline water-soluble resin was prepared as follows. In a 50 L tank reactor equipped with a thermometer, stirring blade, reflux condenser and dropping device, 0.45 kg of acrylic acid (AA), 2.4 kg of ethyl acrylate (EA), methyl methacrylate (MMA) 0 .15 kg, 12 g of 2,2′-azobis- (2,4 dimethylvaleronitrile) as a polymerization initiator, and 3 kg of methanol as a solvent were charged. In addition, the dropping apparatus is mixed with 1.05 kg of acrylic acid, 2.1 kg of methyl acrylate, 3.85 kg of methyl methacrylate, 28 g of 2,2′-azobis- (2,4 dimethylvaleronitrile), and 7 kg of methanol. The solution was charged.

The solution in the tank reaction vessel was heated to 65 ° C. with stirring in a nitrogen gas atmosphere and reacted for 20 minutes, thereby adjusting the polymerization rate of the contents to 72%. Then, the said mixed solution was dripped uniformly over 2 hours from the dripping apparatus, maintaining internal temperature at 65 degreeC. After completion of dropping, the contents were aged at 65 ° C. for 3 hours. After the reaction was completed, 20 kg of methyl ethyl ketone was mixed with the contents to obtain a 25% by mass solution of an alkaline water-soluble resin (hereinafter referred to as ASP).

(Water absorbent resin)
As the water-absorbent resin, a commercially available polyacrylic acid sodium salt crosslinked product (trade name: Aqualic CA ML-70, average particle size 50 μm, manufactured by Nippon Shokubai Co., Ltd.) was used. Hereinafter, this polyacrylic acid sodium salt crosslinked body is referred to as SAP.
[Sheet substrate]
A woven fabric sheet (trade name: TC-7270, sold by Tomen Co., Ltd.) having a basis weight of 160 g / m ² and a thickness of 0.32 mm was used as the sheet-like substrate.
(Lubricity layer)
An ASP / SAP dispersion liquid (700 g of ASP 25 mass% solution and 175 g of SAP mixed and dissolved) so that the mass in the dry state becomes ASP: SAP = 1: 1 in the above-mentioned ASP 25 mass% solution. ) So that ASP and SAP each have a coating amount (adhesion amount) of 50 g / m ² by immersing the sheet-like substrate on one side (the total coating amount of ASP and SAP is 100 g). / M ² ) A lubricity expressing layer was produced.

Examples 1-3
The pressure-sensitive adhesive prepared in Production Examples 1 to 3 was uniformly applied on the release paper with an applicator so that the dry adhesion amount was 200 g / m ² , left at room temperature of 25 ° C. for 24 hours, and then heated at 100 ° C. for 2 minutes. The solvent was removed by evaporation by drying. The solvent content of this pressure-sensitive adhesive layer was 1% by mass. One side of the pressure-sensitive adhesive layer adhering to the release paper and the friction cutter (registered trademark) coating material sheet having the lubricity-expressing layer was bonded and pressure-bonded, and cut into a width of 25 mm × 50 mm to prepare a sample. In this way, a sheet-like material in which the pressure-sensitive adhesive layer and the lubricity-expressing layer of the present invention were provided via a sheet-like substrate was prepared and used as a sample. Also, Kasaoka clay (alternative to rust) is sprayed onto a 70 mm × 70 mm iron plate with a 50 mesh (mesh opening 300 μm) sieve (conforming to JIS Z 8801) so as to be uniformly 60 g / m ^2. did. Then, the release paper on the back surface of the sheet-like material sample was peeled off, a 40 mm long portion was attached to the adherend, and a load of 4 kgf was applied for 1 minute from the top of the sheet. Next, using "QC tensile tester TE-2001 type" (trade name, manufactured by Test Sangyo Co., Ltd.), the adherend (iron plate) is fixed to the lower fixing part, and the sample sheet is fixed to the upper fixing part. did. As shown in FIG. 1, the tensile test was performed by pulling a sample sheet having a width of 25 mm in the 0 ° direction (that is, in a direction parallel to the iron plate) at a speed of 100 mm / min, and measuring the resistance due to adhesion at that time. The measurement was performed at 25 ° C. and a relative humidity of 65%. The results are shown in Table 1. Table 2 shows the relationship between the glass transition temperature of the monomer composition contained in the pressure-sensitive adhesive and the pressure-sensitive adhesive force (resistance force due to pressure-sensitive adhesive). Moreover, as a sheet-like base material, a paper sheet (trade name; Cosmo Paper, manufactured by Daio Paper Co., Ltd.) having a basis weight of 50 g / m ² and a thickness of 0.07 mm is used, and the adhesive layer of Example 2 is used in the same manner as described above. Thus, a sheet-like material was produced. Similarly, the adhesive strength was 200 gf.

Comparative Example 1
For comparison, “WF102” (trade name, manufactured by Konishi Co., Ltd .; Bond SS tape, 0.75 mm × 25 mm width × 10 m), which is a commercially available strong double-sided tape, was used in the same manner as in Examples 1 to 3, and by adhesion. An attempt was made to measure the resistance, but the sheet did not stick to the adherend, and measurement was impossible.

In Table 1, “BA” is butyl acrylate, “2EHA” is 2-ethylhydroxyacrylate, “VAc” is vinyl acetate (vinyl acetate), and “AA” Acrylic acid.

In an Example, it is a conceptual diagram which illustrates the form at the time of measuring the resistance force by adhesion | attachment.

Claims (4)

It is a civil engineering / architecture sheet-like material having at least an adhesive layer and a lubricity-expressing layer,
Adhesive layer is the adhesive strength between the sprayed steel material surface dry soil, the adhesive layer of the sheet material 25mm width superimposed to 40mm in steel, the 0 degree direction at the fixed tensile tester both A civil engineering / architectural sheet material characterized by having a weight of 10 gf or more when measured by pulling on a load. The said adhesive layer contains 40 mass% or more of polymers obtained using the monomer composition whose glass transition temperature (Tg) is -30 degrees C or less with respect to 100 mass% of all adhesive layer components. The civil engineering / architecture sheet-like article according to claim 1. 3. The civil engineering / architectural sheet material according to claim 1, wherein the pressure-sensitive adhesive layer has a solvent content of 5% by mass or less with respect to 100% by mass of the total pressure-sensitive adhesive layer component. The civil engineering / architectural sheet material according to claim 1, 2 or 3, wherein the sheet material for civil engineering / architecture is provided with a pressure-sensitive adhesive layer and a lubricating expression layer via a sheet-like base material. Sheet material.

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