JP2016169590A - Water leakage prevention member, water leakage prevention method, and water leakage prevention structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water leakage prevention member capable of preventing water leakage for a long period of time, a water leakage prevention method, and a water leakage prevention structure.SOLUTION: A water leakage prevention member 1 prevents leakage of water from a concrete channel 10. The water leakage prevention member 1 includes a water leakage prevention layer 2 in which a load during 10% extension deformation when the water leakage prevention layer with a width of 10 mm is extended by 10% in a longitudinal direction orthogonal to a width direction is 20 N or less and in which breaking elongation is 50% or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water leakage preventing member, a water leakage preventing method, and a water leakage preventing structure, and more particularly to a water leakage preventing member used for preventing water leakage in a water channel, a water leakage preventing method and a water leakage preventing structure using the same.

  Conventionally, waterways such as small-scale agricultural waterways and road gutters are formed by connecting and laying a plurality of waterway concrete blocks, such as U-shaped, as concrete waterway members.

  When a concrete channel member elapses for a long period of time, the joint material filled in the connecting portion is peeled off or consumed, and a gap is generated in the connecting portion. In addition, cracks occur in the concrete channel member. As a result, water leaks from gaps such as connected parts and cracks, causing moisture damage to the farmland along the railway line, and may not be able to supply the amount of water necessary for irrigation downstream farmland. In addition, when there are houses in the vicinity, there is a risk of causing damage such as underfloor flooding.

  In order to prevent such water leakage, a water leakage repair material that can be attached to the gap is known (see Patent Document 1).

  Patent Document 1 includes a base material layer and an adhesive layer, the base material layer is made of an aluminum film or the like, and the adhesive layer is made of a modified alphalt pressure-sensitive adhesive or the like. The leakage repair material for concrete irrigation structures with a difference in flexibility is described.

JP 2010-133203 A

  However, a concrete channel member may repeatedly undergo thermal expansion and contraction due to cold and warm conditions from the environment, or may be subjected to impact from the outside, and gaps such as connected portions and cracks repeatedly expand and contract. Further, the water channel is worn by earth and sand mixed in agricultural water, and the surface of the concrete water channel member is uneven.

  However, in the water leakage repair material of patent document 1, since the base material layer is comprised from the aluminum film etc., the followable | trackability with respect to the expansion-contraction of a clearance gap or the unevenness | corrugation of a surface is low. Therefore, when used for a long period of time, a gap is generated again between the water leakage repair material and the concrete water channel member, causing a problem of water leakage.

  An object of the present invention is to provide a water leakage prevention member, a water leakage prevention method, and a water leakage prevention structure that can prevent water leakage for a long period of time.

  The water leakage prevention member of the present invention is a water leakage prevention member for preventing water leakage in a water channel, and a load at the time of 10% elongation deformation when a water leakage prevention layer having a width of 10 mm is elongated by 10% in a longitudinal direction perpendicular to the width direction. It is characterized by having a water leakage preventing layer having a breaking elongation of 20% or less and 50% or more.

  In the water leakage preventing member of the present invention, it is preferable that the water leakage preventing layer includes a pressure-sensitive adhesive layer and a base material layer provided on one surface of the pressure-sensitive adhesive layer.

  In the water leakage preventing member of the present invention, it is preferable that both the pressure-sensitive adhesive layer and the base material layer are formed from a rubber-containing composition.

  In the water leakage preventing member of the present invention, it is preferable that the base material layer contains ethylene-propylene-diene rubber.

  In the water leakage preventing member of the present invention, it is preferable that the pressure-sensitive adhesive layer contains butyl rubber.

  Moreover, in the water leakage preventing member of the present invention, the water leakage preventing member includes a release base material layer provided on the other surface of the pressure-sensitive adhesive layer, and the release base material layer extends along the longitudinal direction of the release base material layer. It is preferable to include a first peeling portion and a second peeling portion that are separated by a cut.

  The water leakage prevention method of the present invention is a water leakage prevention method for preventing water leakage in a water channel, the preparation step for preparing the above water leakage prevention member, and the water leakage prevention member to cover the water leakage portion of the water channel. It is characterized by including an attaching step for attaching to a waterway.

  In the water leakage prevention method of the present invention, it is preferable that the water leakage prevention member is attached to the water channel having a primer layer formed on the surface thereof.

  In the water leakage prevention method of the present invention, it is preferable that in the sticking step, the water leakage prevention member is stuck to the water channel without applying tension in the longitudinal direction of the water leakage prevention member.

  In the water leakage prevention method of the present invention, the preparation step is a step of preparing the water leakage prevention member, and the attaching step peels off the first peeling portion and corresponds to the first peeling portion. After the 1st sticking process and the 1st sticking process which sticks an adhesive layer to the channel, the 2nd exfoliation part is exfoliated, and the adhesive layer corresponding to the 2nd exfoliation part is used as the channel. It is suitable to provide the 2nd sticking process which sticks.

  The water leakage prevention structure of the present invention is a water leakage prevention structure for preventing water leakage in the water channel, and includes the water channel and the water leakage prevention layer provided in the water channel so as to cover a water leakage part of the water channel. It is characterized by that.

  According to the water leakage preventing member, the water leakage preventing method, and the water leakage preventing structure of the present invention, the water leakage preventing member has a water leakage preventing layer having a load at 10% elongation and deformation of 20 N or less and an elongation at break of 50% or more. Prepare. Therefore, according to the expansion and contraction of the water leakage part and the unevenness of the water channel surface, the water leakage prevention layer can also expand and contract and suppress peeling from the water leakage part even when it adheres to the water leakage part for a long period of time. Can do. Therefore, water leakage can be prevented for a long time.

FIG. 1 shows a cross-sectional view of one embodiment of a water leakage preventing member of the present invention. FIG. 2 is an overall perspective view of the water leakage preventing member of FIG. FIG. 3 is an overall perspective view of the water leakage preventing structure using the water leakage preventing member of FIG. 4A to 4B are process diagrams of a water leakage prevention method using the water leakage prevention member of FIG. 1, in which FIG. 4A is a process of determining a sticking area of the concrete water channel, and FIG. 4B is a masking unit in the concrete water channel The process of providing is shown. 5C-5D are process diagrams of the water leakage prevention method using the water leakage prevention member of FIG. 1 following FIG. 4A-FIG. 4B, FIG. 5C is a process of providing a primer layer in a concrete channel, and FIG. The process of arrange | positioning a water leak prevention member is shown. FIGS. 6E to 6F are process diagrams of the water leakage prevention method using the water leakage prevention member of FIG. 1 following FIGS. 5C to 5D, and FIG. 6E attaches the first adhesive portion to the adhesion region. Process, FIG. 6F shows the process of sticking a 2nd adhesion part to a sticking area | region. 7G to 7H are process diagrams of the water leakage prevention method using the water leakage prevention member of FIG. 1 following FIG. 6E to FIG. 6F, and FIG. 7G illustrates that the entire surface of the adhesive layer is adhered to the adhesion region. FIG. 7H shows the process of removing the masking portion. 8A to 8B are cross-sectional views of the water leakage prevention structure. FIG. 8A is a water leakage prevention structure immediately after the water leakage prevention layer is attached to the concrete channel, and FIG. 8B is a water leakage prevention layer in the recess of the concrete channel. The water leakage prevention structure when in close contact is shown. 9A to 9B are cross-sectional views of the water leakage prevention structure, where FIG. 9A is a water leakage prevention structure when the gap of the concrete channel is extended, and FIG. 9B is a water leakage prevention structure when the gap of the concrete channel is reduced. Indicates. FIG. 10 shows a perspective view of another embodiment of the water leakage prevention structure of the present invention (the concrete water channel is a vertical water channel). FIG. 11 shows a perspective view of another embodiment of the water leakage prevention structure of the present invention (a mode in which two water leakage prevention layers are joined together) and an enlarged sectional view thereof. FIG. 12 shows a perspective view of another embodiment of the water leakage prevention structure of the present invention (a form in which a part of the water leakage prevention layer is superimposed) and an enlarged plan view thereof. FIG. 13: shows the schematic of the water leak test apparatus used by the Example and the comparative example. FIG. 14A and FIG. 14B show the concrete flat plate to which the water leak prevention layer was stuck in the water leak test apparatus shown in FIG. 13, FIG. 14A shows a top view, and FIG. 14B shows a side sectional view. FIG. 15 shows a graph relating to the amount of water leakage obtained in the water leakage test A. FIG. 16 shows a graph relating to the amount of water leakage obtained in the water leakage test B. FIG. 17 shows a graph relating to the amount of water leakage obtained in the water leakage test C. FIG. 18 shows a graph relating to the amount of water leakage obtained in the water leakage test D. FIG. 19 shows a graph relating to the amount of water leakage obtained in the water leakage test E. FIG. 20 shows a graph relating to the amount of water leakage obtained in the water leakage test F.

  In FIG. 1A, the vertical direction of the paper surface is the vertical direction of the water leakage prevention member (the thickness direction of the water leakage prevention member, the first direction), and the upper side of the paper surface is the upper side (one side in the thickness direction, one side in the first direction) The lower side is the lower side (the other side in the thickness direction, the other side in the first direction). The left-right direction on the paper surface is the front-rear direction (longitudinal direction, second direction orthogonal to the first direction), the right side on the paper surface is the front side (one side in the longitudinal direction, one side in the second direction), and the left side on the paper surface is the rear side ( The other side in the longitudinal direction and the other side in the second direction). The paper thickness direction is the width direction (the third direction orthogonal to the first direction and the second direction), the front side of the paper is the one side in the width direction (one side in the third direction), and the back side of the paper is the other in the width direction. This is the side (the other side in the third direction). In the following description, the description relating to the direction of the water leakage preventing member conforms to the direction of FIG. 1A. Specifically, it conforms to the direction arrow in each figure.

1. Leakage Prevention Member As shown in FIGS. 1 and 2, the water leakage prevention member 1 is a sheet that is long in the front-rear direction (longitudinal direction) and is wound in a roll shape. The water leakage preventing member 1 includes a water leakage preventing layer 2 and a peeling substrate layer 3. The water leakage prevention layer 2 includes an adhesive layer 4, a base material layer 5 provided on the upper surface (upper surface, one surface) of the adhesive layer 4, and a back treatment layer 6 provided on the upper surface of the base material layer 5. I have.

(Adhesive layer)
The pressure-sensitive adhesive layer 4 is formed in a sheet shape from the pressure-sensitive adhesive composition. Examples of the pressure-sensitive adhesive composition include a rubber pressure-sensitive adhesive composition, an acrylic pressure-sensitive adhesive composition, a polyester pressure-sensitive adhesive composition, a urethane pressure-sensitive adhesive composition, a polyamide pressure-sensitive adhesive composition, an epoxy pressure-sensitive adhesive composition, and a vinyl alkyl ether pressure-sensitive adhesive. Known pressure-sensitive adhesives such as a composition, a silicone pressure-sensitive adhesive composition, and a fluorine pressure-sensitive adhesive composition can be used. These pressure-sensitive adhesive compositions may be used alone or in combination of two or more.

  These pressure-sensitive adhesive compositions may be hot-melt pressure-sensitive adhesives, and are any form of pressure-sensitive adhesives such as emulsion-based pressure-sensitive adhesives, solvent-based pressure-sensitive adhesives, oligomer-based pressure-sensitive adhesives, and solid-based pressure-sensitive adhesives. Also good.

  The pressure-sensitive adhesive composition is preferably a rubber pressure-sensitive adhesive composition from the viewpoints of adhesion and extensibility.

  The rubber contained in the rubber pressure-sensitive adhesive composition may be, for example, either natural rubber or synthetic rubber, but preferably synthetic rubber.

  Examples of the synthetic rubber include butyl rubber, polyisoprene rubber, polyisobutylene rubber, styrene / butadiene (SB) rubber, styrene / isoprene (SI) rubber, styrene / isoprene / styrene block copolymer (SIS) rubber, and styrene / butadiene.・ Styrene block copolymer (SBS) rubber, styrene / ethylene / butylene / styrene block copolymer (SEBS) rubber, styrene / ethylene / propylene / styrene block copolymer (SEPS) rubber, styrene / ethylene / propylene block copolymer Examples thereof include polymer (SEP) rubber and modified products thereof.

  Of these synthetic rubbers, butyl rubber is preferable.

  The blending ratio of the rubber in the rubber pressure-sensitive adhesive composition is, for example, 5% by mass or more, preferably 15% by mass or more, and for example, 50% by mass or less, preferably less than 35% by mass.

  The pressure-sensitive adhesive composition (particularly the rubber pressure-sensitive adhesive composition) preferably contains a tackifier.

  Examples of the tackifier include rosin resins, terpene resins (for example, terpene-aromatic liquid resins), coumarone indene resins, phenol resins, phenol formalin resins, xylene formalin resins, petroleum resins. Examples thereof include resins (for example, C5 petroleum resin, C9 petroleum resin, C5 / C9 petroleum resin, etc.). These tackifiers may be used alone or in combination of two or more.

  The content ratio of the tackifier is, for example, 10 parts by mass or more, preferably 20 parts by mass or more, and, for example, 150 parts by mass or less, preferably 100 parts by mass with respect to 100 parts by mass of the main component such as rubber. 100 parts by mass or less.

  The pressure-sensitive adhesive composition (particularly the rubber pressure-sensitive adhesive composition) preferably contains a softening agent.

  Examples of the softening agent include liquid rubbers such as liquid polybutene rubber, liquid isoprene rubber, and liquid butadiene rubber, for example, oils such as paraffinic oil (process oil, etc.) and naphthenic oil, such as phthalate ester, phosphorus Examples include esters such as acid esters. These softeners may be used alone or in combination of two or more.

  The content of the softening agent is, for example, 50 parts by mass or more, preferably 80 parts by mass or more, and for example, 300 parts by mass or less, preferably 150 parts by mass with respect to 100 parts by mass of the main adhesive component such as rubber. It is below mass parts.

  The pressure-sensitive adhesive composition (particularly the rubber pressure-sensitive adhesive composition) preferably further contains a filler.

  Fillers include, for example, calcium carbonate (for example, heavy calcium carbonate, light calcium carbonate, white gloss), carbon black (for example, acetylene black, furnace black), talc, mica, clay, mica powder, bentonite, silica, Alumina, aluminum silicate, titanium oxide, metal powder (eg, aluminum powder, iron powder, etc.), resin powder (eg, acrylic resin powder, styrene resin powder, etc.), glass powder, boron nitride powder, metal hydroxide (eg, And aluminum hydroxide and magnesium hydroxide). These fillers may be used alone or in combination of two or more.

  Among these fillers, calcium carbonate and carbon black are preferable, and a combination of calcium carbonate and carbon black is more preferable.

  The content of the filler is, for example, 50 parts by mass or more, preferably 100 parts by mass or more, and, for example, 350 parts by mass or less, preferably 200 parts by mass with respect to 100 parts by mass of the main adhesive component such as rubber. It is below mass parts.

  In addition to the above components, the pressure-sensitive adhesive composition further includes, for example, a crosslinking agent (for example, a polyisocyanate-based crosslinking agent, an alkyl etherified melamine compound-based crosslinking agent, etc.), a crosslinking accelerator, a foaming agent, a lubricant, an antioxidant, Known additives such as thixotropic agents, fats and oils, pigments, scorch inhibitors, stabilizers, plasticizers, ultraviolet absorbers, antifungal agents, flame retardants, antistatic agents, and the like can also be contained in appropriate ratios. .

  For production of the pressure-sensitive adhesive layer 4, first, the above-described components are blended in the above-described content ratios, and are kneaded by a kneader such as a mixing roll, a pressure kneader, a Banbury mixer, an extruder, and the like. Prepare as Next, the pressure-sensitive adhesive layer 4 is obtained by compressing and stretching the kneaded material by, for example, press molding with a press or calendar molding with a calender roll. The pressure-sensitive adhesive layer 4 can also be obtained by direct extrusion using an extruder or the like.

  The thickness of the pressure-sensitive adhesive layer 4 is, for example, 0.1 mm or more, preferably 0.2 mm or more, more preferably 0.3 mm or more, and, for example, 3.0 mm or less, preferably 2.0 mm. Below, more preferably, it is 1.0 mm or less.

(Base material layer)
The base material layer 5 is preferably formed in a sheet form from the rubber composition from the viewpoint of extensibility, that is, preferably a rubber sheet.

  The rubber contained in the rubber composition may be, for example, either natural rubber or synthetic rubber, but preferably synthetic rubber.

  Examples of the synthetic rubber include butyl rubber, polyisoprene rubber, polyisobutylene rubber, ethylene-propylene rubber (EPT), ethylene-propylene-diene rubber (EPDM), polybutene rubber, chloroprene rubber, nitrile butyl rubber, chlorinated polyethylene rubber, styrene- Butadiene (SB) rubber, styrene-isoprene (SI) rubber, styrene-isoprene-styrene block copolymer (SIS) rubber, styrene-butadiene-styrene block copolymer (SBS) rubber, styrene-ethylene-butylene-styrene block Examples include copolymer (SEBS) rubber, styrene-ethylene-propylene-styrene block copolymer (SEPS) rubber, styrene-ethylene-propylene block copolymer (SEP) rubber, and modified products thereof. That. These synthetic rubbers may be used alone or in combination of two or more.

  Preferred examples of these synthetic rubbers include butyl rubber, ethylene-propylene rubber, and ethylene-propylene-diene rubber. In particular, the synthetic rubber preferably contains ethylene-propylene-diene rubber, and more preferably butyl rubber and ethylene-propylene-diene rubber are used in combination.

  When the synthetic rubber is a combination of butyl rubber and ethylene-propylene-diene rubber, the mass ratio of butyl rubber to ethylene-propylene-diene rubber is, for example, 0.1 or more, preferably 0.5 or more, 10 or less, preferably 2 or less.

  The blending ratio of rubber in the rubber composition is, for example, 10% by mass or more, preferably 35% by mass or more, and for example, 65% by mass or less, preferably 50% by mass or less.

  The rubber composition preferably further contains a softening agent.

  Examples of the softener include those similar to the softener described above in the rubber pressure-sensitive adhesive composition, preferably paraffin oil.

  The content of the softening agent is, for example, 1 part by mass or more, preferably 5 parts by mass or more, and for example, 50 parts by mass or less, preferably 30 parts by mass or less with respect to 100 parts by mass of rubber. .

  The rubber composition preferably further contains a filler.

  Examples of the filler include those similar to the filler described above in the rubber pressure-sensitive adhesive composition, preferably calcium carbonate and carbon black, and more preferably a combined use of calcium carbonate and carbon black.

  The content of the filler is, for example, 50 parts by mass or more, preferably 100 parts by mass or more, and, for example, 350 parts by mass or less, preferably 200 parts by mass or less with respect to 100 parts by mass of rubber. .

  In addition to the above components, the rubber composition further includes, for example, foaming agents, lubricants, antioxidants, thixotropic agents, fats and oils, pigments, scorch preventing agents, stabilizers, plasticizers, ultraviolet absorbers, antifungal agents, Known additives such as flame retardants and antistatic agents can also be contained in appropriate proportions.

  For the production of the substrate layer 5, first, the above-described components are blended in the above-described content ratios, and are kneaded by, for example, a kneader such as a mixing roll, a pressure kneader, a Banbury mixer, an extruder, and the kneaded product. Prepare as Next, the base material layer 5 is obtained by compressing and stretching the kneaded material by, for example, press molding with a press machine or calendar molding with a calendar roll.

  During kneading and / or compression stretching, heating is performed as necessary.

  The heating temperature is, for example, 80 ° C. or higher, preferably 100 ° C. or higher, and for example, 150 ° C. or lower.

  The thickness of the base material layer 5 is, for example, 0.1 mm or more, preferably 0.2 mm or more, more preferably 0.3 mm or more, and, for example, 2.0 mm or less, preferably 1.5 mm or less. More preferably, it is 1.0 mm or less. If the thickness of the base material layer 5 is too thin, it may be weak against impact. On the other hand, if the thickness of the base material layer 5 is too thick, the force required for stretching the water leakage preventing layer 2 may increase.

  The thickness of the base material layer 5 with respect to the thickness of the pressure-sensitive adhesive layer 4 is, for example, 0.1 or more, preferably 0.3 or more, more preferably 0.5 or more, and for example, less than 10, preferably 5 or less, more preferably 3 or less.

  The base material layer 5 is preferably a rubber sheet made of unvulcanized rubber from the viewpoint of the load and elongation at break when the water leakage preventing layer 2 is stretched by 10%.

(Back treatment layer)
The back surface treatment layer 6 is provided on the upper surface of the base material layer 5 (that is, the back surface of the base material layer 5 on the side opposite to the pressure-sensitive adhesive layer 4). It is a layer provided.

  The composition for forming the back treatment layer 6 is preferably an acrylic composition.

  The acrylic composition can be obtained, for example, by polymerizing a monomer component mainly composed of (meth) acrylic acid ester.

  The (meth) acrylic acid ester is a methacrylic acid ester and / or an acrylic acid ester, and examples thereof include (meth) acrylic acid esters having an alkyl group having 2 to 20 carbon atoms (preferably 15 to 20). .

  In addition to the (meth) acrylic acid ester, the monomer component preferably contains a monomer copolymerizable with the (meth) acrylic acid ester.

  Examples of the copolymerizable monomer include a nitrile group-containing monomer, a carboxyl group-containing monomer, an amide group-containing monomer, and a glycidyl group-containing monomer. Preferably, functional group-containing monomers such as nitrile group-containing monomers are used.

  Examples of the nitrile group-containing monomer include acrylonitrile.

  When the monomer component contains a copolymerizable monomer, the copolymerizable monomer in the monomer component is, for example, 5% by mass or more, preferably 10% by mass or more, and, for example, less than 50% by mass, Preferably, it is 40 mass% or less.

  The weight average molecular weight of the acrylic composition is, for example, 10,000 or more, preferably 20,000 or more, and for example, 1,000,000 or less, preferably 100,000 or less.

  The back surface treatment layer 6 is prepared, for example, by polymerizing a monomer component in an organic solvent such as toluene to prepare an acrylic composition-containing solution (back surface treatment solution), and the acrylic composition-containing solution on the upper surface of the base material layer 5. It is obtained by applying and drying.

  The thickness of the back surface treatment layer 6 is, for example, 0.5 μm or more, preferably 1 μm or more, and for example, 50 μm or less, preferably 10 μm or less.

(Water leakage prevention layer)
The water leakage prevention layer 2 is obtained, for example, by laminating the base material layer 5 on the upper surface of the pressure-sensitive adhesive layer 4 to obtain a laminate, and then the upper surface of the base material layer 5 of the laminate (the surface opposite to the pressure-sensitive adhesive layer 4). It is obtained by forming the back treatment layer 6. In addition, a laminated body is the method of apply | coating an adhesive composition to the base material layer 5, for example, apply | coating an adhesive composition to the peeling base material layer 3, and forming the adhesive layer 4, The adhesive layer 4 is used. It can also be obtained by a method of transferring to the base material layer 5 or the like.

  In the water leakage prevention layer 2, preferably, from the viewpoint of extensibility, both the pressure-sensitive adhesive layer 4 and the base material layer 5 are formed from a composition containing rubber.

  The load at the time of 10% elongation deformation of the water leakage preventing layer 2 obtained in this way is 20 N or less. Preferably, it is 10N or less, More preferably, it is 5N or less. For example, it is 0.1 N or more, preferably 0.3 N or more, more preferably 0.5 N or more.

  When the load at the time of 10% elongation deformation exceeds the above upper limit, the adhesion to the surface of the water channel is lowered, and the followability to unevenness and steps is lowered, resulting in poor water stoppage. On the other hand, if it falls below the lower limit, wrinkles, cuts, peeling, etc. are likely to occur due to deformation stress after the water leakage prevention layer 2 is stuck to the water channel.

  The load at the time of 10% elongation deformation may be 20 N or less in at least one of the front-rear direction and the width direction of the water leakage prevention layer 2, but preferably at least 20 N or less in the front-rear direction.

  The load at the time of 10% elongation deformation of the water leakage preventing layer 2 is a load when the water leakage preventing layer 2 having a width of 10 mm as a test piece is elongated by 10% in the longitudinal direction perpendicular to the width direction. Specifically, first, the water leakage prevention layer 2 is punched into a test piece having a dumbbell shape No. 1 (test width: 10 mm, distance between marked lines: 40 mm) defined in JIS K 6251. This test piece was cross-headed at a speed of 500 mm / min using a tensile tester according to JIS K 6254, with the distance between the marked lines of the test piece being 40 mm and the width of the test piece (test width) being 10 mm. It is obtained by pulling the side and stopping the pulling when the test piece is extended by 10% and measuring the load at this time.

  The elongation at break of the water leakage preventing layer 2 is 50% or more. Preferably, it is 100% or more, more preferably 500% or more. For example, it is 2000% or less, preferably 1500% or less, and more preferably 1200% or less.

  If the elongation at break is below the above lower limit, the ability to follow irregularities and steps on the surface of the waterway will be reduced, resulting in poor water stoppage. On the other hand, when the above upper limit is exceeded, workability may be inferior when the water leakage prevention layer 2 is stuck to a water channel.

  The elongation at break may be 50% or more in at least one of the front-rear direction and the width direction of the water leakage preventing layer 2, but is preferably at least 50% in the front-rear direction.

  The elongation at break is the elongation at break when the water leakage preventing layer 2 having a width of 10 mm as a test piece is stretched in the longitudinal direction perpendicular to the width direction. Specifically, first, the water leakage prevention layer 2 is punched into a test piece having a dumbbell shape No. 1 (test width: 10 mm, distance between marked lines: 40 mm) defined in JIS K 6251. This test piece was cross-headed at a speed of 500 mm / min using a tensile tester according to JIS Z 0237, with the distance between the marked lines of the test piece being 40 mm and the width of the test piece (test width) being 10 mm. It can be determined by pulling the side and measuring the elongation when the test piece is cut.

  The adhesive force of the pressure-sensitive adhesive layer to the SUS plate in the water leakage prevention layer 2 is, for example, 15 N / 25 mm or more, preferably 20 N / 25 mm or more, and for example, 50 N / 25 mm or less.

  The pressure-sensitive adhesive force of the pressure-sensitive adhesive layer 4 to the SUS plate was such that the pressure-sensitive adhesive layer 4 of the water leakage prevention layer (width 25 mm) was attached to the SUS plate, and then, using a tensile tester, a tensile speed of 300 mm / min, a peeling angle. It is measured by peeling the water leakage prevention layer from the SUS plate at 180 degrees.

  The adhesive force of the pressure-sensitive adhesive layer 4 to the back surface of the water leakage prevention layer 2 is, for example, 12 N / 25 mm or more, preferably 18 N / 25 mm or more, and, for example, 40 N / 25 mm or less.

  Further, the peeling mode of the self-back surface adhesive force is preferably cohesive failure. When the peeling form is interface fracture, water may leak at the interface between the water channel surface and the water leakage prevention layer 2.

  The adhesive strength of the adhesive layer 4 to its back surface is prepared by preparing two water leakage prevention layers (width 25 mm), and the adhesive layer 4 of one water leakage prevention layer 2 is the back surface (upper surface, adhesion) of the other water leakage prevention layer 2 Adhering to the side opposite to the agent layer 4, that is, the back treatment layer. Next, it is measured by peeling one water leakage prevention layer 2 from the other water leakage prevention layer 2 at a tensile speed of 300 mm / min and a peeling angle of 180 degrees using a tensile tester.

  The thickness of the water leakage preventing layer 2 is, for example, 0.1 mm or more, preferably 0.3 mm or more, more preferably 0.5 mm or more, and, for example, 10 mm or less, preferably 5.0 mm or less. Preferably, it is 3.0 mm or less. When a plurality of water leakage preventing layers 2 are used in an overlapping manner, the above thickness range indicates the thickness per one water leakage preventing layer.

(Peeling substrate layer)
The release substrate layer 3 is provided on the lower surface (lower surface, the other surface) of the water leakage prevention layer 2, that is, the lower surface of the pressure-sensitive adhesive layer 4.

  The peeling base material layer 3 is formed in a sheet shape, and, for example, a peeling treatment (for example, silicone treatment) is performed on the upper surface or both surfaces thereof.

  As the peeling base material layer 3, for example, a polyester film (PET film or the like), for example, a fluorine-based film made of a fluorine-based polymer (PTFE or the like), for example, an olefin resin film made of an olefin resin (polyethylene, polypropylene or the like). Examples thereof include plastic base layer films such as a polyvinyl chloride film, a polyimide film, a polyamide film (such as a nylon film), and a rayon film. Further, for example, papers such as high-quality paper, Japanese paper, kraft paper, glassine paper, synthetic paper, and top coat paper are also included. These release base material layers 3 may be a single layer or a multilayered composite.

  The thickness of the peeling base material layer 3 is, for example, 1 μm or more, preferably 10 μm or more, and for example, 500 μm or less, preferably 200 μm or less.

  As shown in FIG. 2, the release base material layer 3 is formed with cuts 7 along the front-rear direction (longitudinal direction) at a substantially central portion in the width direction. Specifically, the cut line 7 is formed in a straight line shape along the front-rear direction when projected in the thickness direction, and penetrates the peeling base material layer 3 in the thickness direction.

  The peeling base material layer 3 is divided into a first peeling portion 3 a and a second peeling portion 3 b that can be separated from each other by a cut line 7 in the width direction.

  The width in the width direction of the first peeling portion 3a is substantially the same as the length in the width direction of the second peeling portion 3b.

(Water leakage prevention member)
The water leakage preventing member 1 is obtained by overlapping and winding the adhesive layer 4 of the water leakage preventing layer 2 on the upper surface of the release base material layer 3.

  For example, as shown in FIG. 2, the water leakage preventing member 1 is formed as a roll-like sheet that is long in the front-rear direction.

  The width of the water leakage preventing member 1 is, for example, 50 mm or more, preferably 75 mm or more, and for example, 200 mm or less, preferably 150 mm or less. If the width of the water leakage preventing member 1 is below the lower limit, the reliability of water leakage prevention may be reduced. Moreover, when the width | variety of the water leak prevention member 1 exceeds the said upper limit, workability | operativity may fall.

  The water leakage preventing member 1 is used as a member for preventing water leakage in a water channel, for example. Examples of waterways include small agricultural waterways and road gutters.

  The water channel is formed by connecting and laying a plurality of, for example, U-shaped water channel concrete blocks as concrete water channel members.

  Specifically, as shown in FIG. 3, the water leakage preventing layer 2 of the water leakage preventing member 1 is used by being attached to one or more portions of the concrete water channel 10.

2. Water Leakage Prevention Method With reference to FIGS. 4A to 7H, a method for preventing water leakage of the concrete water channel 10 using the water leakage prevention member 1 will be described in detail.

  The water leakage prevention method includes, for example, a determination step for determining a sticking region 12 for sticking the water leak prevention layer 2, a masking step for providing the masking portion 13 in the concrete water channel 10, an undercoat step for forming the primer layer 14 in the concrete water channel 10, A preparation process for preparing the water leakage prevention member 1, a sticking process for sticking the water leak prevention layer 2 to the sticking region 12 so as to cover the water leak portion 15 of the concrete water channel 10, and a removing process for removing the masking portion 13. Prepare.

  First, as shown to FIG. 4A, the sticking area | region 12 which sticks the water leak prevention layer 2 is determined (decision process).

  The sticking region 12 is the surface of the concrete water channel 10 around the water leakage portion including the water leakage portion 15.

  The water leakage portion 15 is a portion where water leakage has occurred or is predicted to occur, and specifically, a connecting portion 16 (joint portion) in which a plurality of concrete water channel members 11 are connected to each other. It is a gap generated in The water leakage portion 15 extends along the joint of the concrete water channel members 11 adjacent to each other in plan view, and penetrates a part or all of the concrete water channel 10 in the vertical direction.

  The sticking region 12 is located on the inner surface of the concrete water channel 10 (that is, on the surface side through which water flows), and in the flowing direction of the concrete water channel 10, a fixed distance from the connecting portion 16 to the upstream side in the flowing water direction and the downstream side in the flowing water direction. And is partitioned from one end portion to the other end portion in the groove width direction of the concrete water channel 10 (direction perpendicular to the flowing water direction). That is, the sticking region 12 is partitioned so as to include all of the connecting portions 16 in a plan view. In addition, the width | variety (flow water direction length) of the sticking area | region 12 corresponds with the width | variety of the water leak prevention layer 2. FIG.

  If necessary, the surface of the concrete water channel 10 in the sticking region 12 is washed in order to strengthen the formation of the primer layer 14 and the sticking of the water leakage preventing layer 2.

  When the gap of the water leakage portion 15 is wide and the dent is deep, a backup material may be inserted to fill the gap. Thereby, a deformation | transformation, damage, etc. of the water leak prevention layer 2 can be suppressed, and water leak can be prevented more reliably.

  The backup material is not particularly limited as long as it can be filled following the dent of the leaking portion 15, and examples thereof include foam, butyl rubber, clay, putty and the like.

  Next, as shown in FIG. 4B, a masking portion 13 is provided in the concrete water channel 10 (masking step).

  Specifically, a plurality (two) of masking portions 13 are provided so as to sandwich the sticking region 12. That is, the masking part 13 is provided continuously from one end part to the other end part in the groove width direction of the concrete water channel so as to be along the sticking area 12 at a distance from the sticking area 12.

  The masking portion 13 is temporarily provided on the upper surface of the concrete water channel 10 in order to accurately provide the primer layer 14 and the water leakage prevention layer 2 to be described later on the upper surface of the concrete water channel 10, and a known or commercially available masking tape is used. used.

  The interval in the flowing water direction between the masking portion 13 and the sticking region 12 is, for example, 1 mm or more, preferably 2 mm or more, and for example, 50 mm or less, preferably 20 mm or less.

  Next, as shown in FIG. 5C, a primer layer 14 is provided on the concrete water channel 10 (undercoating step).

  Specifically, the primer layer 14 is formed in a region sandwiched between the two masking portions 13. That is, the primer layer 14 is formed so as to include the entire sticking region 12.

  The primer layer 14 is a base layer provided between the concrete water channel 10 and the water leakage preventing layer 2 in order to improve the anchoring force and suppress dust / dust, thereby increasing the adhesive force between the concrete water channel 10 and the water leakage preventing layer 2.

  The primer agent that forms the primer layer 14 may be a known or commercially available primer agent. Examples of the primer agent include a butyl rubber primer, a neoprene primer, a urethane primer, an epoxy primer, and a nitrile primer. Preferably, a butyl rubber-based primer agent is used. If the primer agent is a butyl rubber-based primer agent, when the pressure-sensitive adhesive layer 4 contains butyl rubber, strong adhesion can be obtained.

  The primer layer 14 is formed, for example, by applying a liquid primer agent to the surface of the concrete water channel 10 and drying it.

  Examples of the coating method include a method of coating using a brush, a roller brush, an air spray gun, an airless spray gun or the like.

  The drying time is, for example, 1 minute or more, preferably 15 minutes or more, and for example, 60 minutes or less, preferably 45 minutes or less. By setting the drying time within the above range, workability can be improved.

  The thickness of the primer layer 14 is, for example, 10 μm or more, preferably 30 μm or more, and for example, 200 μm or less, preferably 100 μm or less.

  Next, the water leakage preventing member 1 is prepared (preparation process).

  At this time, the water leakage preventing member 1 is cut according to the length of the sticking region 12 to adjust the length of the water leakage preventing member 1.

  Then, as shown to FIG. 5D-FIG. 7G, the water leak prevention member 1 is stuck on the sticking area | region 12 (sticking process).

  At this time, preferably, the water leakage preventing member 1 is adhered to the adhesion region 12 without applying tension in the front-rear direction of the water leakage preventing member 1.

  For example, first, as shown in FIG. 5D, the water leakage preventing member 1 is disposed in the sticking region 12 (arrangement step). Specifically, the water leakage preventing member 1 is brought into contact with the primer layer 14 formed in the sticking region 12. At this time, the peeling base material layer 3 is brought into contact with the primer layer 14 so that the boundary line (cut 7) between the first peeling portion 3a and the second peeling portion 3b is along the connecting portion 16.

  Subsequently, as shown in FIG. 6E, the first peeling portion 3a is peeled off, and the first adhesive portion 4a as the adhesive layer corresponding to the first peeling portion 3a is stuck to the primer layer 14 (first sticking). Process).

  Specifically, the first peeling portion 3a is cut along the cut line 7 while the upper surface of the water leakage preventing member 1 (particularly above the first adhesive portion 4a to be peeled) is pressed downward by hand or the like. Peel from 2.

  Thereby, the 1st adhesion part 4a is peeled (exposed) from the 1st peeling part 3a, and the peeled 1st adhesion part 4a is stuck on the primer layer 14 simultaneously. That is, the first adhesive portion 4 a is attached to the downstream half portion of the attaching region 12 of the concrete water channel 10 in the flowing direction.

  Then, after a 1st sticking process, as shown to FIG. 6F, the 2nd peeling part 3b is peeled and the 2nd adhesion part 4b as an adhesive layer corresponding to the 2nd peeling part 3b is made into the primer layer 14. Adhere (second adhering step).

  Specifically, in the same manner as in the first sticking step, the second peeling portion is pressed while the upper surface of the water leakage preventing member 1 (particularly, above the second adhesive portion 4b to be peeled) is pressed downward by hand. 3b is peeled off from the water leakage preventing layer 2. At this time, the 1st adhesion part 4a maintains the state stuck on the concrete water channel 10. FIG.

  Thereby, the 2nd adhesion part 4b is peeled (exposed) from the 2nd peeling part 3b, and the peeled 2nd adhesion part 4b is stuck on the primer layer 14 simultaneously. That is, the 2nd adhesion part 4b is stuck on the flow direction upstream half part of the sticking area | region 12 of the concrete water channel 10. FIG.

  In this way, as shown in FIG. 7G, the entire surface of the pressure-sensitive adhesive layer 4 is stuck to the sticking region 12 so as to cover the water leakage portion 15.

  Next, as shown in FIG. 7H, the masking portion 13 is removed (removal step).

  Specifically, the masking portion 13 such as a masking tape is peeled from the concrete water channel 10.

  In this way, the water leakage prevention structure 8 is obtained.

  As shown in FIG. 7H, the water leakage prevention structure 8 includes a concrete water channel 10 and a water leakage prevention layer 2 provided in the concrete water channel 10 so as to cover a water leakage portion 15 of the concrete water channel.

  In the water leakage prevention structure 8, the water leakage prevention layer 2 is adhered to the surface of the concrete water channel 10. In particular, immediately after the sticking step, as shown in FIG. 8A, the water leakage prevention layer 2 is in contact with and sticking to the convex portion 20 on the surface of the concrete water channel 10, while the water leakage prevention layer 2 is a concrete water channel. There is a case where the concave portion 21 on the surface of 10 is not in contact. That is, there is a case where a gap 22 is generated between the water leakage preventing layer 2 and the recess 21.

  However, in the water leakage prevention structure 8, since the water leakage prevention layer 2 has a predetermined 10% elongation deformation load and breaking elongation, as shown in FIG. , Extending toward the concave portion on the surface of the concrete water channel 10, contacting the concave portion 21, and sticking. Thereby, since the space | gap 22 lose | disappears and the water leak prevention layer 2 follows the surface unevenness | corrugation and level | step difference of the concrete water channel 10 in the whole lower surface, it can prevent water leak reliably.

  Further, when water is passed through the concrete water channel 10 through the water leakage prevention structure 8, the water leakage prevention layer 2 is pressed downward by the pressure of water. Also by this water pressure, the gap 22 disappears, and the water leakage prevention layer 2 is brought into close contact with the surface irregularities and steps of the concrete water channel 10.

  The water leakage prevention structure 8 includes both the modes of FIGS. 8A and 8B.

  Further, in the water leakage prevention structure 8, the water leakage portion 15 (gap) of the concrete water channel 10 expands and contracts in the flowing water direction or the groove width direction due to a change in the outside air temperature throughout the year.

  And in this water leakage prevention structure 8, the water leakage prevention layer 2 is provided with the load and breaking elongation at the time of predetermined 10% expansion | extension deformation. Therefore, as shown in FIG. 9A, when the water leakage portion 15 extends, the entire water leakage prevention layer 2 extends according to the expansion. Moreover, as shown in FIG. 9B, when the water leakage portion 15 contracts, the entire water leakage prevention layer 2 is reduced in accordance with the reduction. That is, according to the expansion and contraction of the water leakage portion 15, the water leakage prevention layer 2 can also expand and contract as a whole. Further, the water leakage preventing layer 2 can follow the surface irregularities of the concrete water channel 10. Therefore, even when the water leakage prevention layer 2 is stuck to the water leakage portion 15 for a long period of time, the adhesion between the surface of the concrete water channel 10 and the water leakage prevention layer 2 is reliably maintained, and the water leakage of the water leakage prevention layer 2 The peeling at the portion 15 can be reliably suppressed. Therefore, the water leakage prevention structure 8 can prevent water leakage for a long time.

  In the water leakage prevention structure 8, when an external element such as hard powder (for example, gravel or gravel) enters the space 22 between the water leakage prevention layer 2 and the recess 21, the water flow area of the space 22 decreases. As a result, the water pressure is reduced, the water leakage prevention layer 2 is further pressed against the surface irregularities of the concrete water channel 10, and the void 22 disappears. Therefore, the water leakage prevention performance can be further improved by the external element.

  In addition, when a highly rigid base material layer such as an aluminum film is provided and the water leakage prevention layer does not satisfy the predetermined load or elongation at break by 10%, the base material layer inhibits the expansion and contraction of the adhesive layer. Therefore, when it is repeatedly expanded and contracted, a gap or peeling occurs at the interface between the pressure-sensitive adhesive layer and the surface of the concrete channel or the base material layer, resulting in water leakage.

3. In the embodiment of FIG. 2, the peeling base material layer 3 includes the first peeling portion 3 a and the second peeling portion 3 b that are divided by the cut line 7. 3 may not be divided by the cut line 7. That is, the peeling base material layer 3 may be composed of a single peeling base material layer continuous in the width direction.

  Preferably, the peeling base material layer 3 includes a first peeling portion 3 a and a second peeling portion 3 b that are divided by the cut line 7.

  By providing such a peeling base material layer 3 in the water leakage preventing member 1, in the water leakage preventing method, the first peeling portion 3 a is peeled off, and the first adhesive portion 4 a is placed on the downstream side portion of the sticking region 12 in the flowing direction. After sticking, the 2nd peeling part 3b can be peeled and the 2nd adhesion part 4b can be stuck to the flowing direction upstream part of the sticking area | region 12. FIG.

  For this reason, the water leakage preventing layer 2 can be accurately adhered to the adhesion region 12 along the connecting portion 16 of the concrete water channel 10 without applying tension in the longitudinal direction (longitudinal direction) of the water leakage preventing member 1. Therefore, the residual stress of the front-back direction concerning the water leak prevention layer 2 after sticking can be reduced, the shift | offset | difference and peeling of the water leak preventive layer 2 after sticking can be suppressed, and water leak can be prevented for a long period of time.

  In the embodiment of FIG. 5C, the primer layer 14 is formed wider than the width of the sticking region 12. For example, although not shown, the primer layer 14 is formed with the same width as the width of the sticking region 12. You can also.

  From the viewpoint that the water leakage prevention layer 2 can be reliably and easily adhered onto the primer layer 14, the primer layer 14 is preferably formed wider than the width of the adhesion region 12.

  In the embodiment of FIG. 5C, the primer layer 14 is provided on the surface of the concrete channel 10. For example, although not shown, the water leakage prevention layer 2 is directly attached to the surface of the concrete channel 10 without providing the primer layer 14. You can also That is, it is not necessary to perform the undercoat process.

  From the viewpoint of improving the adhesive force of the water leakage preventing layer 2 to the concrete water channel 10 and preventing water leakage more reliably, the primer layer 14 is formed in the concrete water channel 10.

  In the embodiment of FIGS. 5D to 7G, the first adhesive portion 4a is peeled from the first peeling portion 3a and at the same time the peeled first adhesive portion 4a is stuck to the sticking region 12. The 1st adhesion part 4a can also be stuck to the adhesion area | region 12 after making all the 1 adhesion part 4a peel from the 1st peeling part 3a. Specifically, after the entire front-rear direction of the first peeling portion 3a is peeled off from the water leakage preventing layer 2 without pressing the upper surface of the water leakage preventing member 1 downward, the entire first adhesive portion 4a is once exposed. First primer 3a is brought into contact with primer layer 14. The same method can be adopted for the second adhesive portion 4b.

  In the embodiment of FIG. 3, the water leakage portion 15 is a connection portion 16 to which a plurality of U-shaped concrete water channel members 11 are connected. For example, as shown in FIG. 10, the water leakage portion is a bowl-shaped water channel. It may be 30 corners 31.

  The water leakage prevention structure 8 of FIG. 10 includes a vertical water channel 30 as a water channel and a water leakage prevention layer 2 provided in the vertical water channel 30 so as to cover the corners 31 of the vertical water channel 30.

  In addition, in the water leakage prevention structure 8 of FIG. 10, the water leakage prevention layer 2 is provided in all corner portions 31, but the water leakage prevention layer 2 may be provided in one or a plurality of corner portions 31 that are not all.

  In the water leakage prevention method of FIG. 11, one continuous water leakage prevention layer, that is, one water leakage prevention layer is attached to the connecting portion. For example, as shown in FIG. 11, two water leakage prevention layers 2A and 2B can be joined together.

  That is, one water leakage prevention layer 2A is stuck from one end of the connecting portion 16 in the groove width direction to the middle of the groove width direction. Next, the other water leakage preventing layer 2B is connected from the middle of the connecting portion 16 in the groove width direction so that the front end portion of the other water leakage preventing layer 2B overlaps the rear end portion of the one water leakage preventing layer 2A in plan view. Adhere to the other end in the groove width direction.

  The water leakage prevention layer 2 has a predetermined load at 10% elongation and elongation at break, and further has excellent self-back adhesion. Therefore, in the joint portion 32 between the water leakage prevention layer 2B and the water leakage prevention layer 2A, the other water leakage prevention layer 2B follows the step at the rear end portion of the one water leakage prevention layer 2A and is stable without gaps. Can adhere to each other. Therefore, water leakage can be easily and reliably prevented even at a connecting portion having a long distance.

  Further, in the water leakage prevention structure 8 of FIG. 3, one piece of the water leakage prevention layer 2 is adhered to the connecting portion 16, but, for example, as shown in FIG. Layer 2C can also be overlaid.

  This water leakage prevention layer 2 has excellent self-back adhesion. Therefore, also in the overlapping portion 33, the small water leakage preventing layer 2C can be adhered to the one water leakage preventing layer 2A satisfactorily. Therefore, even if a hole 34 such as breakage occurs in one of the water leakage prevention layers 2A, it is only necessary to attach a small piece of the water leakage prevention layer 2C so as to cover the hole 34. Can do.

  Further, in the water leakage prevention structure 8 of FIG. 3, the single water leakage prevention layer 2 is adhered to the connecting portion 16. For example, although not shown, one (lower side) water leakage prevention layer 2 is the same as that. The other (upper) water leakage preventing layer 2 of the size can be overlapped so as to completely match in a plan view. That is, a plurality (for example, two) of the water leakage preventing layers 2 can be disposed so as to completely overlap each other. Also in this embodiment, the plurality of water leakage preventing layers 2 can follow the surface of the concrete water channel 10 and can reliably prevent water leakage. Further, in this embodiment, in the leakage portion 15, water (for example, groundwater) flows backward from the leakage portion 15 (for example, joint portion), and a reverse flow phenomenon occurs in which the leakage prevention layer 2 is pushed upward from the lower side. Even later, water leakage can be prevented promptly and reliably.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these. Specific numerical values such as 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 the corresponding blending ratio (content ratio) ), Physical property values, parameters, etc. The upper limit value (numerical value defined as “less than” or “less than”) or lower limit value (number defined as “greater than” or “exceeded”) may be substituted. it can.

Example 1
(Adhesive layer)
100 parts by weight of butyl rubber, 50 parts by weight of a tackifier, 100 parts by weight of a softening agent, 100 parts by weight of heavy calcium carbonate, and 30 parts by weight of carbon black are put into an extruder and subjected to extrusion molding. A pressure-sensitive adhesive layer having a thickness of 0.8 mm and a width of 100 mm was produced by molding into a long sheet.

(Base material layer)
50 parts by weight of butyl rubber, 50 parts by weight of EPDM, 15 parts by weight of process oil, 120 parts by weight of heavy calcium carbonate and 10 parts by weight of carbon black are put into a mixer (Banbury mixer) and kneaded for 8 minutes. Prepared. Thereafter, the kneaded material was formed into a sheet shape elongated in the front-rear direction with a calender roll under the condition of a roll temperature of 110 ° C., and a base material layer (rubber sheet) having a thickness of 0.5 mm and a width of 100 mm was produced. .

(Back treatment liquid)
Acrylonitrile and octadecyl methacrylate were polymerized in a toluene solution to obtain a copolymer (acrylonitrile / octadecyl methacrylate = 30/70 (mass ratio), weight average molecular weight: 40,000). This copolymer was diluted with toluene to prepare a back treatment solution having a solid content of 1% by mass.

(Water leakage prevention member)
The back surface treatment liquid was applied to the upper surface of the base material layer and dried at 100 ° C. for 0.5 minutes to form a back surface treatment layer having a thickness of about 3 μm. Thereafter, the pressure-sensitive adhesive layer was bonded to the lower surface of the base material layer to obtain a water leakage preventing layer (back treatment layer / base material layer / pressure-sensitive adhesive layer).

  Next, the upper surface of the release base material layer is bonded to the lower surface of the pressure-sensitive adhesive layer of the water leakage prevention layer, and a water leak prevention member (back treatment layer / base material layer / adhesive layer / release base material layer) that is long in the front-rear direction. ) Was manufactured (see FIG. 1).

  In addition, the peeling base material layer is provided with the 1st peeling part and the 2nd peeling part by forming a cut | interruption in the center of the width direction so that the front-back direction may be followed, and the upper surface is a silicone mold release process. It was.

(Leakage prevention method)
A concrete water channel prepared by connecting a plurality of concrete water channel members having a length of 200 cm in the inner flowing direction, a length in the inner groove width direction of 50 cm, and an inner vertical length (height) of 50 cm (figure) 4A).

  The width of the gap between the connecting portions was 5 to 20 mm.

  Next, two masking tapes were prepared, and were attached to a water channel so that the interval between the masking tapes was 120 mm with the connecting portion sandwiched therebetween (see FIG. 4B).

  Next, the surface of the water channel between the two masking tapes was brush-coated with a butyl rubber-based primer (“INX-A4395” manufactured by Sakai Chemical Industry Co., Ltd.) and dried. Thereby, the primer layer was provided in the water channel surface (refer FIG. 5C). The thickness of the primer layer was 60 μm.

  Next, the surface of the release base material layer of the water leakage preventing member was arranged on the surface of the primer layer so that the cut line of the release base material layer coincided with the connecting portion (see FIG. 5D).

  Next, while pressing the upper surface (back treatment layer) of the water leakage preventing member with the hand, the peeling base material layer (first peeling portion) on one side in the width direction is peeled from the water leakage preventing layer along the cut line, and one side in the width direction. The pressure-sensitive adhesive layer (first pressure-sensitive adhesive portion) was attached to the surface of the primer layer (see FIG. 6E).

  Next, with the first adhesive part kept in contact with the primer layer, the release base material layer (second release part) on the other side in the width direction is pressed against the water leak prevention layer while holding the upper surface (back treatment layer) of the water leak prevention member by hand. Then, the pressure-sensitive adhesive layer (second pressure-sensitive adhesive portion) on the other side in the width direction was adhered to the surface of the primer layer (see FIG. 6F). Thereby, the entire lower surface of the pressure-sensitive adhesive layer was adhered to the primer layer (see FIG. 7G).

  Subsequently, the masking tape was peeled from the water channel.

  Thus, the water leakage prevention structure which covered the connection part with the water leakage prevention member was obtained (refer FIG. 7H).

(Comparative Example 1)
A tape in which a modified asphalt pressure-sensitive adhesive layer was laminated on an aluminum film (“AG Tape” manufactured by Showbond Construction Co., Ltd.) was used as a water leakage prevention layer.

  A primer layer similar to the above was provided around the connecting portion of the concrete water channel, and then the pressure-sensitive adhesive layer of this water leakage preventing member was adhered to the primer layer to obtain a water leakage preventing structure.

(Comparative Example 2)
A tape (“No. 57AL” manufactured by Nitto Denko Corporation) in which a butyl pressure-sensitive adhesive layer was laminated on an aluminum film was used as a water leakage prevention layer.

  A primer layer similar to the above was provided around the connecting portion of the concrete water channel, and then the pressure-sensitive adhesive layer of this water leakage preventing member was adhered to the primer layer to obtain a water leakage preventing structure.

(Measurement of load at 10% elongation)
In Examples, the release base material layer was peeled from the water leakage preventing member to obtain a water leakage preventing layer.

  The water leakage prevention layers of Examples and Comparative Examples were punched into test pieces having a dumbbell shape No. 1 (test width: 10 mm, distance between marked lines: 40 mm) defined in JIS K 6251. In addition, it punched out so that the distance of the width direction of a water leakage prevention layer might correspond with a test width, and the distance of the longitudinal direction (front-back direction) of a water leakage prevention layer might correspond to the distance between marked lines. Using a tensile tester in accordance with JIS K 6254, the distance between the marked lines of the test piece is 40 mm, the width of the test piece (test width) is 10 mm, and the test piece is 500 mm / min at 25 ° C. The crosshead side was pulled at a speed, and when the test piece was stretched by 10%, the tension was stopped, and the load at this time was measured. The results are shown in Table 1.

(Measurement of elongation at break)
In Examples, the release base material layer was peeled from the water leakage preventing member to obtain a water leakage preventing layer.

  The water leakage prevention layers of Examples and Comparative Examples were punched into test pieces having a dumbbell shape No. 1 (test width: 10 mm, distance between marked lines: 40 mm) defined in JIS K 6251. In addition, it punched out so that the distance of the width direction of a water leakage prevention layer might correspond with a test width, and the distance of the longitudinal direction (front-back direction) of a water leakage prevention layer might correspond to the distance between marked lines. Using a tensile tester in accordance with JIS Z 0237, the distance between the marked lines of the test piece is 40 mm, the width of the test piece (test width) is 10 mm, and the test piece is 500 mm / min at 25 ° C. Pulled the crosshead side at speed. And the elongation in the front-rear direction of the water leakage prevention layer when the test piece was cut was measured. The results are shown in Table 1.

(Measurement of adhesive strength)
In Examples, the release base material layer was peeled from the water leakage preventing member to obtain a water leakage preventing layer.

  The water leakage preventing layers of Examples and Comparative Examples were cut to a width of 25 mm. By sticking the pressure-sensitive adhesive layer of the water leakage prevention layer to a SUS plate (SUS304), and then peeling off the water leakage prevention layer from the SUS plate at a tensile speed of 300 mm / min and a peeling angle of 180 degrees using a tensile tester. The adhesive strength was measured. The results are shown in Table 1.

(Measurement of self-adhesive strength)
In Examples, the release base material layer was peeled from the water leakage preventing member to obtain a water leakage preventing layer.

  The water leakage prevention layers of Examples and Comparative Examples were cut to a width of 25 mm, and two water leakage prevention layers having a width of 25 mm were prepared. The pressure-sensitive adhesive layer of one water leakage prevention layer was adhered to the back surface (back surface treatment layer) of the other water leakage prevention layer, and then, using a tensile tester, at 25 ° C., a tensile speed of 300 mm / min, a peeling angle of 180 At one degree, one water leakage prevention layer was peeled off from the other water leakage prevention layer, and the peeled state at that time was measured. The results are shown in Table 1.

(Leakage test)
The water leakage prevention structures obtained in the examples and the comparative examples were allowed to flow for 4 months, left to dry for 8 months, and then allowed to flow for 4 months. I confirmed whether or not.

  The case where water leakage did not occur after two water passes was evaluated as ◯, and the case where water leaked during the first four months of water passage was evaluated as ×. The results are shown in Table 1.

(Evaluation of seam adhesion)
In Examples, the release base material layer was peeled from the water leakage preventing member to obtain a water leakage preventing layer.

  The water leakage prevention layers of Examples and Comparative Examples were cut into a width of 25 mm and a length of 100 mm, and two water leakage prevention layers were prepared. Adhesive layer of one water leakage prevention layer is attached to an acrylic plate, and then the two water leakage prevention layers are joined together on the back surface (back surface treatment layer) of one water leakage prevention layer by overlapping 50 mm in the length direction. Thus, the adhesive layer of the other water leakage prevention layer was stuck (refer the enlarged view of FIG. 11). Subsequently, a 5 kg roller was reciprocated on the back surface of the other water leakage preventing layer. Thereafter, in the vicinity of the overlapping portion (joint portion) of the two water leakage preventing layers, it was confirmed whether or not the other water leakage preventing layer was in close contact with the one water leakage preventing layer and the acrylic plate.

  In the overlapped portion, the case where the other water leakage prevention layer followed the step formed by the one water leakage prevention layer and the acrylic plate and was in close contact with these was evaluated as “good”. The case where the other water leakage preventing layer could not follow the steps formed by the one water leakage preventing layer and the acrylic plate and a gap was formed between these and the other water leakage preventing layer was evaluated as x. The results are shown in Table 1.

(Evaluation of adhesion retention)
In the evaluation of the joint adhesion, a 5 kg roller was reciprocated on the back surface of the other water leakage preventing layer, and then left at 40 ° C. for 1 week. Thereafter, in the vicinity of the overlapping portion of the two water leakage prevention layers, it was confirmed whether the other water leakage prevention layer was in close contact with the one water leakage prevention layer and the acrylic plate, and the same evaluation as described above was performed. The results are shown in Table 1.

(Water leakage test under pressure condition A: no primer layer, no silica sand)
A water leakage test apparatus shown in FIG. 13 was produced, and a water leakage test was performed under pressure conditions.

  That is, a groove 41 having a width of 20 mm, a length of 100 mm, and a depth of 30 mm was provided on a concrete flat plate 40 whose surface was worn. The concrete flat plate 40 is formed with a through hole 42 that communicates with one end of the groove 41 and feeds water into the groove 41.

  Next, after the water leakage prevention layer 2 of the example and each comparative example is cut into a width of 100 mm and a length of 150 mm, the adhesive layer 4 is formed on the surface of the concrete flat plate 40 so as to completely cover the groove 41 in a plan view. Was stuck to the concrete flat plate 40 so as to be in direct contact (see FIGS. 14A and 14B).

  Next, a first cylindrical tube 43 having a diameter of 200 mm and an axial length of 200 mm was prepared, and the first cylindrical tube 43 was fixed to the concrete flat plate 40 so as to surround the water leakage prevention layer 2. Subsequently, the upper end opening of the first cylindrical tube 43 was closed with a lid 45.

  On the other hand, a second cylindrical tube 44 having a diameter of 200 mm and an axial length of 1500 mm was prepared vertically. Subsequently, the hose 46 connected the lower end of the second cylindrical tube 44 and the lid 45 of the first cylindrical tube 43 so that the water in the second cylindrical tube 44 was injected into the first cylindrical tube 43.

  Next, water was continuously supplied to the upper end of the second cylindrical tube 44 so that the inside of the second cylindrical tube 44 was always filled with water. Thereby, the inside of the 1st cylindrical pipe | tube 43 was filled with water in the state in which a water pressure is applied to the water leak prevention layer 2 from the upper side.

  At this time, the amount of leaked water and time leaked into the groove 41 were measured. The amount of water leakage (L / m / min) is the amount of water leaked per 1 m of water leakage prevention layer per minute (L), and the water leakage from the half circumference (1/2 of the whole) of the water leakage prevention layer used. Calculated as a quantity. This graph is shown in FIG.

(Water leakage test under pressure condition B: no primer layer, with silica sand)
In the water leakage test A, after the water leakage prevention layer 2 was adhered to the concrete flat plate 40, the quartz sand No. 6 was carried out in the same manner as the water leakage test A, except that the upper surface of the water leakage prevention layer 2 was covered. . The graph of the amount of water leakage at this time and time is shown in FIG.

  From FIG. 15 and FIG. 16, it can be seen that the water leakage prevention layer of the example further improves the water leakage prevention effect under the condition where silica sand is present.

(Water leakage test under pressure condition C: with primer layer, without silica sand)
A primer layer made of a butyl rubber primer (“INX-A4395” manufactured by Sakai Chemical Industry Co., Ltd.) is provided around the groove 41 of the concrete flat plate 40, and the water leakage prevention layer 2 is attached to the concrete flat plate 40 through the primer layer. Except for wearing, it was carried out in the same manner as the water leakage test A. A graph of the amount of water leakage and time at this time is shown in FIG.

(Water leakage test D under pressure conditions: with primer layer and silica sand)
After adhering the water leakage prevention layer 2 to the concrete flat plate 40, the quartz sand No. 6 was carried out in the same manner as the water leakage test C, except that the upper surface of the water leakage prevention layer 2 was covered. A graph of the amount of water leakage and time at this time is shown in FIG.

  From FIG. 17 and FIG. 18, it can be seen that the water leakage prevention layer of the example further improves the water leakage prevention effect under the condition where silica sand is present.

(Leakage test E under pressure condition: double sticking)
With respect to the water leakage prevention layer of Example 1, water leakage test C (except that water was vigorously fed into the groove 41 during the water leakage test and water pressure (back flow) was applied to the water leakage prevention layer 2 from below. This was carried out in the same manner as with the primer layer.

  Moreover, it implemented similarly to the above except having prepared two sheets of the water-leakage prevention layers (width 100mm, length 150mm) of Example 1, and having adhered twice so that it might correspond completely in planar view.

  A graph of the amount of water leakage and time at this time is shown in FIG.

  From FIG. 19, it can be seen that the double-attached water leakage prevention layer has a much better water leakage prevention effect immediately after the backflow under the pressurized condition than the single-attached water leakage prevention layer.

(Leakage test F under natural pressure conditions: double sticking)
In the water leakage test apparatus shown in FIG. 13, the second cylindrical tube 44 was removed, and the amount of water leakage under natural pressure conditions was measured.

  That is, after sticking the water leakage prevention layer 2 of Example 1 to the concrete flat plate 40 through the primer layer, water was poured into the first cylindrical tube 43 so as to have a height of 200 mm. Next, during the water leakage test, water was vigorously sent from the through hole 42 to the groove 41, and the amount of water leakage was measured immediately after water pressure (back flow) was applied to the water leakage prevention layer 2 from below. During the test, silica sand No. 6 was introduced.

  In addition, two sheets of the water leakage prevention layer (width 100 mm, length 150 mm) of Example 1 were prepared, and the natural leakage immediately after the backflow was performed in the same manner as above except that the double leakage was applied so as to completely match in plan view. The amount of water leakage under pressure conditions was measured.

  A graph of the amount of water leakage and time at this time is shown in FIG.

  From FIG. 20, since the water leakage prevention layer of double adhesion has the same level of leakage prevention effect as the water leakage prevention layer of single adhesion, the water leakage prevention layer of double adhesion is also of single adhesion. It can be seen that the same followability to the concrete surface as the water leakage prevention layer is exhibited.

DESCRIPTION OF SYMBOLS 1 Water leakage prevention member 2 Water leakage prevention layer 3 Peeling base material layer 3a 1st peeling part 3b 2nd peeling part 4 Adhesive layer 4a 1st adhesion part 4b 2nd adhesion part 5 Base material layer 7 Cut 8 Water leakage prevention structure 10 Concrete water channel 14 Primer layer 15 Water leakage part

Claims (11)

A water leakage prevention member for preventing water leakage in a waterway,
A water leakage prevention layer having a load of 10 N or less when the 10 mm width water leakage prevention layer is stretched by 10% in the longitudinal direction perpendicular to the width direction is 20 N or less and the elongation at break is 50% or more. A water leakage prevention member characterized by.   The water leakage prevention member according to claim 1, wherein the water leakage prevention layer includes a pressure-sensitive adhesive layer and a base material layer provided on one surface of the pressure-sensitive adhesive layer.   The water leakage preventing member according to claim 2, wherein both the pressure-sensitive adhesive layer and the base material layer are formed of a composition containing rubber.   The water leakage preventing member according to claim 2 or 3, wherein the base material layer contains ethylene-propylene-diene rubber.   The water leakage preventing member according to any one of claims 2 to 4, wherein the pressure-sensitive adhesive layer contains butyl rubber. The water leakage prevention member comprises a release substrate layer provided on the other surface of the pressure-sensitive adhesive layer,
The said peeling base material layer is equipped with the 1st peeling part and the 2nd peeling part which are parted by the cut | interruption along the longitudinal direction of the said peeling base material layer, The any one of Claims 2-5 characterized by the above-mentioned. The water leakage preventing member according to 1. A water leakage prevention method for preventing water leakage in a waterway,
A preparing step of preparing the water leakage preventing member according to any one of claims 1 to 6, and
A water leakage prevention method comprising: an adhesion step of adhering the water leakage prevention member to the water channel so as to cover a water leakage portion of the water channel.   The water leakage prevention method according to claim 7, wherein in the adhering step, the water leakage preventing member is adhered to the water channel having a primer layer formed on a surface thereof.   9. The water leakage prevention method according to claim 7, wherein, in the attaching step, the water leakage preventing member is attached to the water channel without applying tension in the longitudinal direction of the water leakage preventing member. The preparing step is a step of preparing the water leakage preventing member according to claim 6,
The said sticking process peels the said 1st peeling part, the 1st sticking process which sticks the adhesive layer corresponding to a said 1st peeling part to the said water channel, and the said 1st sticking process, The water leakage prevention method according to claim 9, further comprising a second sticking step of peeling the second peeling portion and sticking the pressure-sensitive adhesive layer corresponding to the second peeling portion to the water channel. A water leakage prevention structure for preventing water leakage in a waterway,
The waterway;
A water leakage prevention structure comprising the water leakage prevention member according to any one of claims 1 to 5, which is provided in the water channel so as to cover a water leakage part of the water channel.

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