JP2017160344A - Adhesive sheet for wet surfaces, and concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet for wet surfaces that allows an adherend to be reliably and conveniently arranged on a wet surface, and a concrete structure comprising the same.SOLUTION: An adhesive sheet for wet surfaces 1 has a water absorbing sheet 3, and a second adhesive layer 4 provided on the top face of the water absorbing sheet 3. An area of the second adhesive layer 4 occupies 50% or more and 95% or less of an area of the top face of the water absorbing sheet 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure-sensitive adhesive sheet for attaching a wet surface and a concrete structure including the same.

  Conventionally, waterproofing has been performed on the concrete wall inside the tunnel. Specifically, first, the wall surface of the cut tunnel, such as earth and sand and rock mass, is covered with primary concrete, and a waterproof sheet is disposed on the primary concrete surface. Next, it is covered with concrete (see Patent Document 1).

  Patent Document 1 discloses that after a disc is attached to a primary concrete surface by nailing it, the waterproof sheet is disposed by thermally welding the waterproof sheet to the disc to perform waterproof construction. Yes.

JP-A-4-221198

  However, in the method of Patent Document 1, since a waterproof sheet is applied to the entire wall surface of the tunnel, it is necessary to hit a large amount of nails against hard concrete at a high place near the ceiling. Therefore, the malfunction that workability | operativity is bad arises.

  On the other hand, it is considered to arrange a waterproof sheet on the tunnel wall surface using a general-purpose double-sided adhesive tape. However, at the time of tunnel construction, the wall surface (for example, the primary concrete surface) is moistened by water that oozes from the forest or water at the time of covering concrete. Therefore, the malfunction that a double-sided tape peels off from a primary concrete surface arises. In addition, there is a demand for attaching and fixing waterproof objects, other sheets and structures, etc. to wet concrete surfaces other than tunnels. It is desired.

  An object of the present invention is to provide a wet surface-adhesive pressure-sensitive adhesive sheet on which a desired object such as a desired sheet can be reliably and easily disposed on a wet surface, and a concrete structure including the same. .

The present invention [1] includes a water absorbing layer and an adhesive layer provided on at least one surface of the water absorbing layer, and the ratio of the area of the adhesive layer to the area of the one surface of the water absorbing layer is 50%. The adhesive sheet for wet surface sticking which is 95% or less is included.

  This invention [2] contains the adhesive sheet for wet surface sticking as described in [1] further provided with the other side adhesive layer provided in the other surface of the said water absorption layer.

  As for this invention [3], the said adhesive layer contains the adhesive sheet for wet surface sticking as described in [1] or [2] which consists of an acrylic adhesive composition or a rubber-type adhesive composition.

  This invention [4] contains the adhesive sheet for wet surface sticking as described in any one of [1]-[3] whose thickness of the said adhesive layer is 30 micrometers or more.

In the present invention [5], the wet surface sticking pressure-sensitive adhesive according to any one of [1] to [4], wherein the water absorption rate of the water absorption layer exceeds 0 g / m ² and is 2000 g / m ² or less. Includes a sheet.

  As for this invention [6], the said water absorption layer contains the adhesive sheet for wet surface sticking as described in any one of [1]-[5] which consists of a sheet | seat containing a fiber.

  In the present invention [7], the water absorbing layer includes a base sheet, a nonwoven fabric covering one surface of the base sheet, and a water absorbent resin provided between the base sheet and the nonwoven fabric. The adhesive sheet for wet surface sticking as described in any one of 1]-[5] is included.

  This invention [8] is provided with the adhesive sheet for wet surface sticking as described in any one of [1]-[7] provided so that the said adhesive layer may contact concrete and one side of the said concrete. The said adhesive layer in the said adhesive sheet for wet surface sticking contains the concrete structure provided with the coating sheet provided so that the other side surface may be contacted.

  According to the pressure-sensitive adhesive sheet for attaching a wet surface of the present invention, it can be reliably and simply adhered to the wet surface. Therefore, an adherend such as a desired sheet can be placed on the wet surface via the wet surface-attached adhesive sheet.

  The concrete structure of this invention can be reliably arrange | positioned on the concrete surface through the wet surface sticking adhesive sheet of this invention, without dropping a coating sheet.

1A to 1B show a pressure-sensitive adhesive sheet according to the first embodiment of the present invention, FIG. 1A is a cross-sectional view taken along the line A-A in FIG. 1B, and FIG. 1B is a plan view. 2A to 2E show how to use the pressure-sensitive adhesive sheet of FIG. 1A, FIG. 2A shows a step of placing a concrete primary coating on the wall surface, and FIG. 2B shows a step of sticking the pressure-sensitive adhesive sheet to the concrete primary coating. FIG. 2C shows a step of attaching a waterproof sheet to the adhesive sheet, FIG. 2D shows a step of arranging a concrete secondary covering, and FIG. 2E shows a step of obtaining a concrete structure. 3A to 3B show the pressure-sensitive adhesive sheet according to the second embodiment of the present invention, FIG. 3A is a cross-sectional view, and FIG. 3B is a plan view in a state where the second pressure-sensitive adhesive layer is not provided. FIG. 4 shows a cross-sectional view of the pressure-sensitive adhesive sheet according to the third embodiment of the present invention. FIG. 5 shows a cross-sectional view of the pressure-sensitive adhesive sheet according to the fourth embodiment of the present invention.

  In FIG. 1A, the vertical direction of the paper surface is the vertical direction (first direction, thickness direction), the upper side of the paper surface is the upper side (one side in the first direction, the one side in the thickness direction), and the lower side of the paper surface is the lower side (the other side in the first direction). , The other side in the thickness direction). The left and right direction on the paper surface is the left and right direction (second direction orthogonal to the first direction), the left side on the paper surface is the left side (second side in the second direction), and the right side on the paper surface is the right side (the other side in the second direction). The paper thickness direction is the front-rear direction (the third direction orthogonal to the first direction and the second direction), the front side of the paper is the front side (one side in the third direction), and the back side of the paper is the rear side (the other side in the third direction). is there. Drawings other than FIG. 1A (excluding FIG. 2) also conform to the direction of FIG. 1A.

<First Embodiment>
The wet surface-attached pressure-sensitive adhesive sheet (hereinafter abbreviated as pressure-sensitive adhesive sheet) of the first embodiment of the present invention is a water-absorbing layer and a pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer) provided on the upper surface (one surface) of the water-absorbing layer. ) And the other pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) provided on the lower surface (the other surface) of the water absorption layer. Specifically, as shown in FIGS. 1A and 1B, the pressure-sensitive adhesive sheet 1 according to the first embodiment of the present invention includes, from the bottom surface, a first pressure-sensitive adhesive layer 2, a water-absorbing sheet 3 as an example of a water-absorbing layer, and The second pressure-sensitive adhesive layer 4 is provided in this order.

  The first pressure-sensitive adhesive layer 2 has a sheet shape (including a film shape) having a predetermined thickness, extends in the front-rear direction and the left-right direction (surface direction) orthogonal to the thickness direction, and has a flat upper surface and a flat lower surface. Have.

  The 1st adhesive layer 2 is formed in the sheet form from the adhesive composition.

 Examples of the pressure-sensitive adhesive composition include acrylic pressure-sensitive adhesive compositions, rubber-based pressure-sensitive adhesive compositions, silicone-based pressure-sensitive adhesive compositions, polyester-based pressure-sensitive adhesive compositions, urethane-based pressure-sensitive adhesive compositions, and polyamide-based pressure-sensitive adhesive compositions. , Epoxy pressure-sensitive adhesive compositions, vinyl alkyl ether pressure-sensitive adhesive compositions, fluorine-based pressure-sensitive adhesive compositions, and the like. These pressure-sensitive adhesive compositions can be used alone or in combination of two or more.

  The pressure-sensitive adhesive composition is preferably an acrylic pressure-sensitive adhesive composition or a rubber-based pressure-sensitive adhesive composition, more preferably an acrylic pressure-sensitive adhesive composition, from the viewpoints of adhesiveness, durability, cost, and the like. It is done.

  The acrylic pressure-sensitive adhesive composition contains, for example, an acrylic polymer obtained by copolymerizing a monomer component having (meth) acrylic acid alkyl ester as a main component and a functional group-containing monomer as a copolymerization component as a polymer component. doing.

  The (meth) acrylic acid alkyl ester is an acrylic acid alkyl ester and / or a methacrylic acid alkyl ester, and specifically, butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate. , T-butyl (meth) acrylate, pentyl (meth) acrylate, neopentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, (meth) acrylic Octyl acid, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, ( Linear or branched carbon, such as tetradecyl (meth) acrylate (Meth) acrylic acid alkyl ester having an alkyl moiety of 4-14 are mentioned. The (meth) acrylic acid alkyl ester can be used alone or in combination of two or more.

  The (meth) acrylic acid alkyl ester is preferably a (meth) acrylic acid alkyl ester having an alkyl moiety having 4 to 10 carbon atoms, more preferably butyl (meth) acrylate, (meth) acrylic acid 2 -Ethylhexyl.

  The blending ratio of the (meth) acrylic acid alkyl ester is, for example, 90 parts by mass or more, preferably 95 parts by mass or more, more preferably 97 parts by mass with respect to 100 parts by mass of all monomer components constituting the acrylic polymer. Part or more, and for example, 99.5 parts by mass or less, preferably 99 parts by mass or less.

  Examples of functional group-containing monomers include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, fumaric acid, maleic acid, monomethyl itaconate, 2- (meth) acryloyloxyethyl trimellitic acid, and carboxyethyl (meth) acrylate. Examples thereof include hydroxyl group-containing monomers such as 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate. The functional group-containing monomers can be used alone or in combination of two or more.

  As a functional group monomer, Preferably, a carboxyl group-containing monomer is mentioned, More preferably, acrylic acid is mentioned. Thereby, the cohesive force of the pressure-sensitive adhesive layer becomes even better, and the interaction with the adherend interface having a high polarity can be improved.

  The blending ratio of the functional group monomer is, for example, 0.5 parts by mass or more, preferably 1 part by mass or more, for example, 10 parts by mass or less, preferably 5 parts by mass in 100 parts by mass of all monomer components. Hereinafter, it is more preferably 3 parts by mass or less. By setting the blending ratio of the functional group monomer, particularly the blending ratio of acrylic acid, within the above range, the unevenness followability with respect to the rough surface is excellent, and the adhesiveness is further improved.

  The weight average molecular weight of the acrylic polymer is, for example, 300000 or more, preferably 400000 or more, and for example, 2000000 or less, preferably 150,000 or less. Thereby, adhesive force can fully be expressed in an adhesive layer. The weight average molecular weight is measured by gel permeation chromatography based on a standard polystyrene equivalent value.

  The acrylic pressure-sensitive adhesive composition can be obtained, for example, by a known method such as solution polymerization, bulk polymerization, or photopolymerization, and preferably can be obtained by solution polymerization. In solution polymerization, specifically, a polymerization initiator is blended in an organic solvent together with a monomer component, and the monomer component is polymerized.

  As a polymerization initiator, a thermal polymerization initiator and a photoinitiator are mentioned, for example, In the case of solution polymerization, Preferably, a thermal polymerization initiator is mentioned.

  Examples of the polymerization initiator include azo polymerization initiators such as 2,2′-azobisisobutyronitrile and 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), such as benzoyl. Examples thereof include peroxide-based polymerization initiators such as peroxide and t-butyl hydroperoxide. The thermal polymerization initiators can be used alone or in combination of two or more.

  The blending ratio of the thermal polymerization initiator is, for example, 0.01 parts by mass or more, preferably 0.1 parts by mass or more, preferably 10 parts by mass or less, preferably 100 parts by mass of all monomer components. Is 5 parts by mass or less.

  The organic solvent only needs to be able to dissolve the monomer component. For example, ester solvents such as ethyl acetate and butyl acetate, for example, aromatic hydrocarbon solvents such as toluene, xylene, and benzene, such as n-pentane and n-hexane. And aliphatic hydrocarbon solvents such as n-heptane, for example, alicyclic hydrocarbon solvents such as cyclohexane and methylcyclohexane, and ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone. The organic solvent can be used alone or in combination of two or more.

  The rubber-based pressure-sensitive adhesive composition contains, for example, natural rubber and / or synthetic rubber, specifically, rubber such as polyisobutylene rubber, polyisoprene rubber, chloroprene rubber, butyl rubber, and nitrile butyl rubber as a polymer component, It can be obtained by a known method.

  These compositions may contain a known additive such as a crosslinking agent, and further a tackifier resin, a processing aid, a pigment, a flame retardant, a filler, a softener, and an anti-aging agent.

  Examples of the crosslinking agent include epoxy crosslinking agents, isocyanate crosslinking agents, melamine resins, aziridine derivatives, metal chelate compounds, and the like. The crosslinking agents can be used alone or in combination of two or more.

  The thickness of the 1st adhesive layer 2 is 30 micrometers or more, for example, Preferably, it is 50 micrometers or more, for example, is 1000 micrometers or less, Preferably, it is 700 micrometers or less, More preferably, it is 500 micrometers or less.

  The water absorbent sheet 3 has a sheet shape having a predetermined thickness, extends in the surface direction, and has a flat upper surface and a flat lower surface. The water absorbent sheet 3 is disposed on the entire upper surface of the first pressure-sensitive adhesive layer 2 so that the lower surface of the water absorbent sheet 3 is in contact with the upper surface of the first pressure-sensitive adhesive layer 2.

The water absorbing sheet 3 is a sheet whose water absorption rate exceeds 0 g / m ² . The water absorption is preferably 5 g / m ² or more, more preferably 50 g / m ² or more, still more preferably 200 g / m ² or more, and for example, 2000 g / m ² or less, preferably 1000 g / m ^2. m ² or less, more preferably 800 g / m ² or less.

  When the water absorption rate exceeds the lower limit, water is absorbed from the wet surface (the adherend surface of the adherend to which the second pressure-sensitive adhesive layer 4 is brought into contact) into the water-absorbent sheet 3, and the pressure-sensitive adhesive sheet and the wet surface are formed. Decrease of the adhesive force due to water can be suppressed, and peeling of the adhesive sheet can be suppressed.

  The water absorption is measured by the loss on drying method. Specifically, it is measured by measuring the mass of the water absorbent sheet 3 immediately after water absorption and the water absorbent sheet 3 after drying at 120 ° C. for 3 hours.

  Examples of the water-absorbing sheet 3 include a sheet containing fibers, and preferably a sheet containing fibers.

  Examples of the fibers include cellulose fibers, polyester fibers, polyolefin fibers, polyacrylic fibers, polyurethane fibers, polyvinyl alcohol fibers, and carbon fibers.

  The water-absorbing sheet 3 preferably includes a sheet containing cellulose fibers (cellulose fiber-containing sheet), more preferably a cellulose fiber-containing sheet. Examples of such a cellulose fiber-containing sheet include cellulose fiber paper, preferably Japanese paper and impregnated paper (including resin-impregnated paper), and more preferably impregnated paper.

  Specifically, for example, KTH series and AT series manufactured by Yodogawa Paper Mill, Inc., for example, resin impregnated paper manufactured by Oji F-Tex Co., Ltd. and the like can be mentioned.

The weight of the water absorbing sheet 3 is, for example, 10 g / m ² or more, preferably 100 g / m ² or more, for example, 500 g / m ² or less, preferably 200 g / m ² or less.

The density of the water absorbing sheet 3 is, for example, 0.1 g / m ³ or more, preferably 0.5 g / m ³ or more, and, for example, 5.0 g / m ³ or less, preferably 2.0 g / m. ³ or less.

  The thickness of the water absorbing sheet 3 is, for example, 0.05 mm or more, preferably 0.1 mm or more, and for example, 5.0 mm or less, preferably 3.0 mm or less, more preferably 1.0 mm or less. is there.

  The second pressure-sensitive adhesive layer 4 has a sheet shape having a predetermined thickness, extends in the surface direction, and has a flat upper surface and a flat lower surface. The second pressure-sensitive adhesive layer 4 is disposed on a part of the upper surface of the water absorbent sheet 3 so that the lower surface of the second pressure-sensitive adhesive layer 4 is in contact with the upper surface of the water absorbent sheet 3.

  The ratio of the area (plan view) of the second pressure-sensitive adhesive layer 4 is 50% or more, preferably 60% or more, and 95% or less, preferably 92, with respect to the area of the upper surface of the water absorbent sheet 3. % Or less. That is, in a plan view, the ratio of the exposed surface 5 (adhesive uncoated portion) of the water absorbent sheet 3 exposed from the second adhesive layer 4 is preferably 5% or more with respect to the area of the upper surface of the water absorbent sheet 3. Is 8% or more and 50% or less, preferably 40% or less.

  By setting the area of the second pressure-sensitive adhesive layer 4 within the above range, the water-absorbing sheet 3 allows the water present on the wet surface 6 to pass through the exposed surface 5 while ensuring the adhesive surface with the wet surface 6 (see FIG. 2A). Can be absorbed in. For this reason, the water staying at the interface between the second pressure-sensitive adhesive layer 4 and the wet surface 6 can be eliminated, and the pressure-sensitive adhesive sheet 1 can be reliably adhered to the wet surface 6.

  For example, as shown in FIG. 1B, the second pressure-sensitive adhesive layer 4 has a wavy striped pattern in plan view. Specifically, the plurality of corrugated adhesive portions 4a are formed so as to extend in the left-right direction with an interval (exposed surface 5) therebetween in the front-rear direction. The plurality of corrugated adhesive portions 4a are arranged so as to be in phase with each other.

  The 2nd adhesive layer 4 is formed in the sheet form from the adhesive composition.

 Examples of the pressure-sensitive adhesive composition include the same one as the pressure-sensitive adhesive composition exemplified in the first pressure-sensitive adhesive layer 2, preferably an acrylic pressure-sensitive adhesive composition and a rubber-based pressure-sensitive adhesive composition, and more preferably. An acrylic pressure-sensitive adhesive composition may be mentioned.

  The thickness of the second pressure-sensitive adhesive layer 4 is, for example, 10 μm or more, preferably 30 μm or more, more preferably 50 μm or more, and for example, 1000 μm or less, preferably 700 μm or less, more preferably 500 μm or less. is there. The thickness of the second pressure-sensitive adhesive layer 4 is arbitrarily adjusted depending on the type of adherend to be bonded for fixing, and may be thicker or thinner than the first pressure-sensitive adhesive layer 2.

  The pressure-sensitive adhesive sheet 1 is, for example, a step of obtaining a first pressure-sensitive adhesive layer-forming separator by applying and drying the pressure-sensitive adhesive composition on the separator without gaps, and applying the pressure-sensitive adhesive composition to the separator so as to have a predetermined area. The process of obtaining the 2nd adhesive layer formation separator by drying, using the 1st adhesive layer formation separator to the 1st surface of the water absorption sheet 3, the 1st adhesive layer 2 is transcribe | transferred, and the water absorption sheet 3 It can manufacture by the process of transferring the 2nd adhesive layer 4 to the other side of this using the 2nd adhesive layer formation separator.

  In addition, the pressure-sensitive adhesive composition is applied to the entire surface of one side of the water-absorbing sheet 3 and dried to form the first pressure-sensitive adhesive layer 2, and the other side of the water-absorbing sheet 3 is bonded to a predetermined area. It can also be produced by applying and drying the agent composition to form the second pressure-sensitive adhesive layer 4.

  The pressure-sensitive adhesive sheet 1 can be used, for example, as the pressure-sensitive adhesive sheet 1 for fixing an adherend such as a covering sheet to the wet surface 6 (see FIG. 2A).

  Examples of the wet surface 6 include a concrete wall surface.

  As a covering sheet, a waterproof sheet, a reinforcement sheet, etc. are mentioned as a sheet fixed to a concrete wall surface, for example.

  As a waterproof sheet, the sheet | seat provided with the waterproof layer and nonwoven fabric which consist of ethylene-vinyl acetate copolymer resin (EVA) etc. are mentioned, for example.

  Examples of the reinforcing sheet include a carbon fiber sheet.

  Then, with reference to FIG. 2A-FIG. 2E, the usage method of the adhesive sheet 1 is demonstrated. Specifically, a method of manufacturing a concrete structure 9 by fixing a waterproof sheet 7 as an example of a covering sheet to the surface of a concrete primary covering 8 as an example of concrete via an adhesive sheet 1 will be described. To do.

  First, as shown in FIG. 2A, the concrete primary covering 8 is arranged on a target wall surface 19 (for example, a wall surface made of earth and sand, a rock bed, etc. in a tunnel). For example, fresh concrete is sprayed with a spraying machine and cured for an arbitrary period to solidify the ready-mixed concrete to form a primary concrete covering 8 (sprayed concrete).

  The surface (wet surface 6) of the concrete primary covering 8 is wet with water during curing of the concrete, water from the wall surface 19, and the like.

  Next, as shown in FIG. 2B, the pressure-sensitive adhesive sheet 1 is attached to the surface of the concrete primary covering 8. Specifically, the pressure-sensitive adhesive sheet 1 is pressed against the concrete primary coating 8 so that the second pressure-sensitive adhesive layer 4 contacts the surface of the concrete primary coating 8.

  At this time, the water on the wet surface 6 reaches the exposed surface 5 of the water absorbent sheet 3 through the gap between the first pressure-sensitive adhesive layers 2 and is absorbed into the water absorbent sheet 3.

  Next, as shown in FIG. 2C, a waterproof sheet 7 is attached to the adhesive sheet 1. Specifically, the waterproof sheet 7 is pressed against the adhesive sheet 1 such that the waterproof sheet 7 contacts the first adhesive layer 2 of the adhesive sheet 1.

  Next, as shown in FIG. 2D, a concrete secondary covering 10 (lining concrete) is disposed. Specifically, the mold frame 20 is disposed at a distance from the waterproof sheet 7, and the ready-mixed concrete 10 ′ is placed in the mold frame 20 so as to contact the waterproof sheet 7. Then, it hardens for arbitrary periods, solid concrete 10 'is solidified, and the concrete secondary covering 10 is formed.

  At this time, a curing sheet or the like can be disposed on the surface (concrete side) of the mold 20.

  As shown in FIG. 2E, the concrete structure 9 thus obtained is disposed on the concrete primary coating 8, the pressure-sensitive adhesive sheet 1 disposed on one surface of the concrete primary coating 8, and the one surface of the pressure-sensitive adhesive sheet 1. And a concrete secondary covering 10 disposed on one surface of the waterproof sheet 7.

  In the above method, the pressure-sensitive adhesive sheet 1 and the waterproof sheet 7 are arranged in order on the surface of the concrete primary covering 8. For example, although not shown, the pressure-sensitive adhesive sheet 1 is attached to the waterproof sheet 7 in advance, and then Further, the waterproof sheet 7 to which the adhesive sheet is attached can be disposed on the surface of the concrete primary covering 8.

  And this adhesive sheet 1 is provided with the 1st adhesive layer 2, the water absorption sheet 3 provided in the upper surface of the 1st adhesive layer 2, and the 2nd adhesive layer 4 provided in the upper surface of the water absorption sheet 3, The ratio of the area of the 2nd adhesive layer 4 to the area of the upper surface of the water absorbing sheet 3 is 50% or more and 95% or less.

  For this reason, the water absorbing sheet 3 can absorb the water on the wet surface 6 through the exposed surface 5 while ensuring the adhesiveness with the wet surface 6. Therefore, water staying at the interface between the second pressure-sensitive adhesive layer 4 and the wet surface 6 can be eliminated, and the pressure-sensitive adhesive sheet 1 can be reliably attached to the wet surface 6. And a desired coating sheet can be affixed on the 1st adhesive layer 2 on the opposite side to the 2nd adhesive layer 4. FIG. Therefore, a desired covering sheet can be disposed on the wet surface via the pressure-sensitive adhesive sheet 1.

  In addition, the concrete structure 9 using the pressure-sensitive adhesive sheet 1 can be reliably disposed on the surface of the concrete primary covering 8 without dropping the waterproof sheet 7 via the pressure-sensitive adhesive sheet 1.

  In the embodiment of FIG. 1B, the second pressure-sensitive adhesive layer 4 is formed in a wavy striped pattern, but the shape thereof is not limited. For example, although not shown in the figure, a straight striped pattern or a polka dot pattern is used. Also, it can be formed in a pattern such as a random shape.

  In the present invention, from the viewpoint that water on the exposed surface 5 can be evenly absorbed by the water absorbent sheet 3, preferably, a wavy stripe pattern and a straight stripe pattern are mentioned, and more preferably, a wavy stripe pattern. Pattern.

Second Embodiment
The adhesive sheet 1 of 2nd Embodiment of this invention is equipped with a water absorption layer, the adhesive layer provided in the upper surface of a water absorption layer, and the other side adhesive layer provided in the lower surface of a water absorption layer. Specifically, as shown in FIGS. 3A and 3B, the pressure-sensitive adhesive sheet 1 according to the second embodiment of the present invention includes, from the bottom surface, a first pressure-sensitive adhesive layer 2, a water-absorbing structure 11 as an example of a water-absorbing layer, and The second pressure-sensitive adhesive layer 4 is provided in this order.

  The first pressure-sensitive adhesive layer 2 and the second pressure-sensitive adhesive layer 4 of the second embodiment have the same configurations as the first pressure-sensitive adhesive layer 2 and the second pressure-sensitive adhesive layer 4 of the first embodiment, respectively.

The water absorption structure 11 includes a base sheet 12, a nonwoven fabric 13, and a water absorbent resin 14. Moreover, the water absorption rate of the water absorbing structure 11 exceeds 0 g / m ² , preferably 5 g / m ² or more, more preferably 50 g / m ² or more, and further preferably 200 g / m ² or more. For example, it is 2000 g / m ² or less, preferably 1000 g / m ² or less, and more preferably 800 g / m ² or less.

  The base sheet 12 has a sheet shape having a predetermined thickness, extends in the surface direction, and has a flat upper surface and a flat lower surface.

  Examples of the base sheet 12 include a sheet having no water absorption and water permeability. For example, a polyester film such as a polyethylene terephthalate film, for example, a polyolefin such as a polyethylene film, a polypropylene film, and an ethylene-propylene copolymer film. Examples of the film include plastic films such as a polyvinyl chloride film, a polyvinylidene chloride film, and an ethylene-vinyl acetate copolymer film.

  The thickness of the base sheet 12 is, for example, 10 μm or more, more preferably 50 μm or more, and for example, 2000 μm or less, preferably 1000 μm or less, more preferably 500 μm or less, and further preferably 100 μm or less. .

  The nonwoven fabric 13 has a sheet shape having a predetermined thickness, and is formed to extend in the surface direction. The nonwoven fabric 13 is arranged on the entire upper surface of the base sheet 12 such that a part of the lower surface of the nonwoven fabric 13 is in contact with a part of the upper surface of the base sheet 12 (contact portion 16). That is, a space is provided on the lower surface of the nonwoven fabric 13 and the upper surface of the base sheet 12 at locations other than the contact portion 16.

  The contact portion 16 is formed in a rectangular frame shape as shown by the phantom line in FIG. 3B. Specifically, the contact portion 16 includes a frame portion 17 formed on the entire peripheral edge of the base sheet 12 and a plurality of streak portions 18 formed on the inner side of the base sheet 12.

  The plurality of stripes 18 are arranged at equal intervals in the left-right direction, and each stripe 18 is formed so as to extend in the front-rear direction from the front edge to the rear edge of the base sheet 12.

  As a fiber which comprises the nonwoven fabric 13, Preferably, the resin fiber which consists of a thermoplastic resin or a thermosetting resin is mentioned. Specific examples include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as polyethylene terephthalate, polyamide fibers such as nylon, and cellulose fibers. These resin fibers can be used alone or in combination of two or more.

  The average fiber diameter is, for example, 0.1 μm or more, preferably 0.5 μm or more, and for example, 100 μm or less, preferably 50 μm or less.

  Examples of the method for producing the nonwoven fabric include a dry method, a wet method, a spun bond method, a thermal bond method, a chemical bond method, a stitch bond method, a needle punch method, a melt blow method, a spun lace method, and a steam jet method.

The weight of the nonwoven fabric 13 is, for example, 1 g / m ² or more, preferably 10 g / m ² or more, and for example, 200 g / m ² or less, preferably 50 g / m ² or less.

  The thickness of the nonwoven fabric 13 is 5 micrometers or more, for example, Preferably, it is 10 micrometers or more, for example, is 2000 micrometers or less, Preferably, it is 1500 micrometers or less, More preferably, it is 500 micrometers or less, More preferably, it is 200 micrometers or less.

  The water-absorbing resin 14 is a resin having water-absorbing properties, such as isobutylene-maleic anhydride copolymer, polyacrylic acid or a salt thereof, alkali metal salt of carboxymethyl cellulose, alkali metal salt of alginic acid, gelatin, bacterial cellulose Etc. Preferably, polyacrylic acid or a salt thereof is used.

  The shape of the water absorbent resin 14 is preferably particulate (powder).

  The average particle diameter (average of the maximum length) of the water absorbent resin 14 is, for example, 100 μm or more, preferably 200 μm or more, and, for example, 900 μm or less, preferably 800 μm or less.

The content of the water-absorbing resin 14 is not limited as long as the water absorption rate of the water absorbing structure 11 exceeds 0 g / m ² , for example, 0.05 g or more, preferably 0.5 g per 100 cm ^{2 of} the water absorbing structure. For example, it is 20 g or less, preferably 10 g or less.

  For example, the water absorbent structure 11 is formed by disposing the nonwoven fabric 13 on the upper surface of the substrate sheet 12 and thermocompression bonding the nonwoven fabric 13 so that a part of the contact portion 16 is formed, and then the substrate sheet 12 and the nonwoven fabric 13. It is possible to manufacture by filling the water-absorbing resin 14 between the two and finally thermocompression bonding the remaining portion of the contact portion 16.

  The adhesive sheet 1 of 2nd Embodiment also has an effect similar to the adhesive sheet 1 of 1st Embodiment.

  From the viewpoint that water can be uniformly absorbed by the entire surface of the pressure-sensitive adhesive sheet 1, the first embodiment is preferable.

  From the viewpoint of easily adjusting the amount of water absorption, the second embodiment is preferable.

<Third Embodiment>
The adhesive sheet 1 of 3rd Embodiment of this invention is equipped with a water absorption layer and the adhesive layer provided in the upper surface of a water absorption layer. Specifically, as shown in FIG. 4, the pressure-sensitive adhesive sheet 1 of the third embodiment of the present invention includes a water-absorbing sheet 3 as an example of a water-absorbing layer and a second pressure-sensitive adhesive layer 4 in this order from the bottom surface. Prepare.

  The water absorbent sheet 3 and the second pressure-sensitive adhesive layer 4 of the third embodiment have the same configuration as the water absorbent sheet 3 and the second pressure-sensitive adhesive layer 4 of the first embodiment, respectively.

  In addition, when manufacturing the concrete structure 9 using the adhesive sheet 1 of this 3rd Embodiment, the adhesive sheet 1 so that the 2nd adhesive layer 4 may contact the surface of the concrete primary covering 8, for example. After adhering, the first pressure-sensitive adhesive layer 2 is disposed on the other side surface of the water absorbent sheet 3 (the surface on which the second pressure-sensitive adhesive layer 4 is not laminated), and then the waterproof sheet 7 is placed on the first pressure-sensitive adhesive layer 2. Affix. Moreover, after sticking the adhesive sheet 1 so that the 2nd adhesive layer 4 may contact the surface of the concrete primary covering 8, the 1st adhesive layer 2 was previously provided in the other side surface of the water absorbing sheet 3. The waterproof sheet 7 may be attached.

  The adhesive sheet 1 of 3rd Embodiment also has the same effect as the adhesive sheet 1 of 1st Embodiment. From the viewpoint, the first embodiment is preferable.

<Fourth embodiment>
The adhesive sheet 1 of 4th Embodiment of this invention is equipped with a water absorption layer and the adhesive layer provided in the upper surface of a water absorption layer. Specifically, as shown in FIG. 5, the pressure-sensitive adhesive sheet 1 of the fourth embodiment of the present invention has a water-absorbing structure 11 as an example of a water-absorbing layer and a second pressure-sensitive adhesive layer 4 in this order from the bottom surface. Prepare with.

  The water absorption structure 11 and the second pressure-sensitive adhesive layer 4 of the fourth embodiment have the same configurations as the water absorption structure 11 and the second pressure-sensitive adhesive layer 4 of the second embodiment, respectively.

  In addition, when manufacturing the concrete structure 9 using the adhesive sheet 1 of this 4th Embodiment, it can carry out similarly to 3rd Embodiment.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, this invention is not limited to an Example and a comparative example at all. In addition, specific numerical values such as a blending ratio (content ratio), physical property values, and parameters used in the following description are described in the above-mentioned “Mode for Carrying Out the Invention”, and a blending ratio corresponding to them ( Substituting the upper limit value (numerical value defined as “less than” or “less than”) or the lower limit value (number defined as “greater than” or “exceeded”) such as content ratio), physical property values, parameters be able to.

Example 1
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser, 10 parts by mass of butyl acrylate, 90 parts by mass of 2-ethylhexyl acrylate, and 2.5 parts by mass of acrylic acid as monomer components, As a thermal polymerization initiator, 0.2 part by mass of 2,2′-azobisisobutyronitrile was charged together with 200 parts by mass of ethyl acetate. Nitrogen gas was introduced with gentle stirring, and the atmosphere was purged with nitrogen for 1 hour. Then, the liquid temperature in a flask was kept at 60 degreeC vicinity, and it was made to react for 15 hours or more, and the acrylic polymer solution whose weight average molecular weight is 500,000 was prepared. To this solution, 0.05 part by mass of an epoxy-based crosslinking agent (manufactured by Mitsubishi Gas Chemical Company, “TETRAD-C”) was further mixed to obtain an acrylic pressure-sensitive adhesive composition.

  The acrylic pressure-sensitive adhesive composition is applied to the entire surface of the separator (“Diafoil MRF38”, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.), dried at 130 ° C., and the first pressure-sensitive adhesive layer (application area 100%, thickness) 100 μm).

  The above-mentioned acrylic pressure-sensitive adhesive composition is applied to a separator (same as above) so as to have a wave shape (a wavy striped pattern, see FIG. 1B), and dried at 130 ° C. to form a second pressure-sensitive adhesive layer (Application area 93%, thickness 150 μm) was formed.

As a water-absorbing sheet, impregnated paper (“KTH-125”, manufactured by Yodogawa Paper Mill Co., Ltd., water absorption 347 g / m ² , thickness 0.24 mm, density 0.54 g / cm ³ , weighing 132 g / m ² ) was prepared. The 1st adhesive layer was transcribe | transferred and arrange | positioned at the lower surface of a water absorbing sheet, and it transcribe | transferred and arrange | positioned at the 2nd adhesive layer on the upper surface. Thereby, the adhesive sheet was manufactured (refer FIG. 1A).

Example 2
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer was applied so that the area of the second pressure-sensitive adhesive layer was 87.5%.

Example 3
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer was coated so that the area of the second pressure-sensitive adhesive layer was 80%.

Example 4
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer was applied so that the area of the second pressure-sensitive adhesive layer was 71%.

Example 5
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the second pressure-sensitive adhesive layer was coated so that the area of the second pressure-sensitive adhesive layer was 50%.

Example 6
A non-woven fabric (thickness 76 μm, weighing 22.6 g / m ² , manufactured by Nippon Paper Industries Co., Ltd.) was laminated on a base sheet (polyethylene film, thickness 50 μm, manufactured by Aichi Plastics), and heat-sealed in a striped manner. From the edge of the stack, the clearance of the laminate, the water-absorbent resin powder ( "Kuraray KI gel", crosslinked isobutylene - maleic acid copolymer anhydride polymers, manufactured by Kuraray Co., Ltd.), 6 g filled in a substrate sheet 100 cm ² per Then, the edge of the laminate was thermally fused (see FIG. 3B). This produced the water absorption structure (refer FIG. 3A).

  Next, in the same manner as in Example 4, the first pressure-sensitive adhesive layer is disposed on the base sheet side surface of the water-absorbing structure, the second pressure-sensitive adhesive layer is disposed on the nonwoven fabric-side surface of the water-absorbing structure, and the pressure-sensitive adhesive sheet is Manufactured.

Comparative Example 1
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1, except that the area of the second pressure-sensitive adhesive layer was 100%.

Comparative Example 2
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the area of the second pressure-sensitive adhesive layer was applied to be 40%.

Comparative Example 3
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a polyethylene terephthalate film (thickness 38 μm, water absorption 0%) was used instead of the water absorbent sheet.

Comparative Example 4
A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1, except that the application area of the second pressure-sensitive adhesive layer was 100%, and a polyethylene terephthalate film (thickness 38 μm, water absorption 0%) was used instead of the water-absorbent sheet. Manufactured.

Comparative Example 5
All-sky tape (“No. 690”, double-sided tape, manufactured by Nitto Denko Corporation, thickness 0.42 mm) was used.

(Constant load holding test for waterproof sheet)
A waterproof sheet (“high panel SS sheet”, manufactured by KFC Corporation) is cut into 10 cm × 20 cm, and the adhesive sheet of each of the 10 cm × 5 cm Examples and Comparative Examples is the first adhesive at the center. The adhesive layer was attached to the waterproof sheet by placing the agent layer in contact and pressing the 2 kg roller in one reciprocation.

  Next, a 10 cm × 5 cm mortar plate (manufactured by Nippon Test Panel Co., Ltd.) was prepared, and the surface thereof was uniformly wetted with 4 cc of water. The adhesive sheet / waterproof sheet adhesive is placed so that the second adhesive layer is in contact with the mortar wet surface, and pressed once with a 2 kg roller, whereby the adhesive sheet / waterproof sheet adhesive is Affixed to a mortar board.

  Subsequently, the mortar board / adhesive sheet / waterproof sheet sticking body was fixed in the air using a jig in a state where the waterproof sheet was on the lower side. A 100 g weight was attached to the waterproof sheet. Moreover, the operation | work which dripped 6 cc of water on a mortar board was repeated every 24 hours of test start.

  After 168 hours, the case where the waterproof sheet was not peeled off from the adhesive sheet and peeling between the waterproof sheet and the adhesive sheet was hardly observed was evaluated as ◯. After 168 hours, the waterproof sheet did not peel off from the adhesive sheet, but the case where peeling between the waterproof sheet and the adhesive sheet was observed was evaluated as Δ. The case where the waterproof sheet peeled off within 168 hours was evaluated as x. The results are shown in Table 1.

DESCRIPTION OF SYMBOLS 1 Adhesive sheet 2 1st adhesive layer 3 Water absorbing sheet 4 2nd adhesive layer 6 Wet surface 7 Waterproof sheet 8 Concrete primary covering 9 Concrete structure 11 Water absorbing structure 12 Base material sheet 13 Nonwoven fabric 14 Water absorbing resin

Claims (8)

A water absorption layer,
An adhesive layer provided on at least one surface of the water absorption layer,
A pressure-sensitive adhesive sheet for attaching to a wet surface, wherein the ratio of the area of the pressure-sensitive adhesive layer to the area of the one surface of the water-absorbing layer is from 50% to 95%.   The pressure-sensitive adhesive sheet for attaching to a wet surface according to claim 1, further comprising a pressure-sensitive adhesive layer on the other side provided on the other surface of the water-absorbing layer.   The pressure-sensitive adhesive sheet for wet surface application according to claim 1 or 2, wherein the pressure-sensitive adhesive layer comprises an acrylic pressure-sensitive adhesive composition or a rubber-based pressure-sensitive adhesive composition.   The thickness of the said adhesive layer is 30 micrometers or more, The adhesive sheet for wet surface sticking as described in any one of Claims 1-3 characterized by the above-mentioned. The moisture-adhesive adhesive sheet according to any one of claims 1 to 4, wherein the water absorption rate of the water-absorbing layer exceeds 0 g / m ² and is 2000 g / m ² or less.   The said water absorption layer consists of a sheet | seat containing a fiber, The adhesive sheet for wet surface sticking as described in any one of Claims 1-5 characterized by the above-mentioned. The water absorption layer is
A base sheet;
A non-woven fabric covering one surface of the base sheet;
A wet absorbent adhesive sheet according to any one of claims 1 to 5, comprising a water absorbent resin provided between the base sheet and the nonwoven fabric. Concrete,
The wet adhesive adhesive sheet according to any one of claims 1 to 7, wherein the adhesive layer is provided so that the adhesive layer is in contact with one surface of the concrete.
The said adhesive layer in the said adhesive sheet for wet surface sticking is equipped with the coating sheet provided so that the other side surface may be contacted, Concrete structure characterized by the above-mentioned.

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