JPWO2019012655A1 - Multilayer masking sheet - Google Patents

Abstract

The present invention makes it possible to reduce the number of cornering masking operations and to provide a masking sheet that maintains good workability during cornering masking and that is easy to peel off. A multilayer masking sheet in which a plurality of rectangular single layer masking sheets including the sheet substrate 1 and the pressure-sensitive adhesive layer 2 are laminated, wherein each single layer masking sheet is opposed to the first side a of the masking sheet substrate An adhesive layer 2 is provided along the outer edge of the side c of 2 and a tack-free area B is formed at the center toward the fourth side d opposite to the third side b different from the first and second sides. A cornering multilayer masking sheet characterized by being provided is used.

Description

  The present invention relates to a masking sheet of a multilayer structure used at the time of reinforcement work of road floor slabs and the like. More specifically, the present invention relates to a multilayer masking sheet when corner-cut masking of the grid portion is performed, for example, when forming a strip-like reinforcing sheet in a grid shape on the floor lower surface. The present invention also relates to a method of reinforcing a floor slab using the multilayer masking sheet.

  Conventionally, as a method of reinforcing a road floor slab, a method is known in which a continuous fiber sheet composed of reinforcing fibers (carbon fibers, aramid fibers, etc.) and a resin (epoxy resin, etc.) is adhered to the entire lower surface of the floor slab.

  However, this method has a problem that the construction cost is high because the amount of continuous fiber sheet used is large, and the floor plate is covered with the continuous fiber sheet, so that the floor may occur when the automobile travels repeatedly. There has been a problem that defects such as plate cracks can not be observed after construction. Furthermore, there is a problem that the infiltration water from the upper surface of the floor slab stays between the concrete and the continuous fiber sheet on the lower surface of the floor slab, and the life of the floor slab is reduced.

  Then, the method of installing the continuous sheet arrange | positioned in the lower surface of a floor slab in a grid | lattice form is proposed (patent document 1). According to this method, since the exposed portion where the continuous fiber sheet is not covered is formed on the lower surface of the floor slab, it is possible to easily observe the condition such as cracking of the concrete, and the presence of the exposed portion causes the upper surface of the floor slab. It is possible to prevent the infiltration water from being stagnated between the concrete part and the continuous fiber sheet on the floor plate lower surface.

  When installing a continuous fiber sheet in a grid | lattice form, the construction method as shown to the flow sheet of FIG. 6 is illustrated by patent document 1, for example.

  First, the bottom surface of the floor slab is treated with kelen (a base treatment for scraping the entire concrete surface) (S1 '), and then a primer is applied to the base. Carry out cornering of the grid part (marking the finish position on the structure etc.) masking (S2 '), and further perform primer treatment (S3') to carry out inland correction (work to fill up unevenness etc.) Form the base. Installation (pasting) of a continuous fiber sheet is performed on this. For example, the first layer corner out masking (S5 ') was performed, and after the resin (undercoating) was applied, the first layer reinforcing fiber was applied thereon (S6'), and the resin (upper coating) was applied and impregnated After (S7 '), the first layer masking sheet is removed (S8'). Next, the second layer corner out masking is performed (S9 '), and after the resin (undercoating) is applied, the second layer reinforcing fiber is pasted thereon (S10'), and the resin (overcoating) is applied and impregnated Then (S11 '), the second layer masking sheet is removed (S12'). After bonding the reinforcing fibers of the first and second layers in a lattice, curing is carried out (S13 ').

  Also, conventionally, a masking tape laminated in multiple layers is known, and is used in the coating field to clean the finish line between the primer coating and the finish coating (Patent Document 2). Patent Document 2 comprises a masking tape substrate coated with an adhesive on the lower side, and a masking tape cover substrate coated with an adhesive on the upper side of the masking tape substrate and laminated on the upper side, The adhesive is applied between the masking tape cover substrate and the masking tape substrate width in a width smaller than the masking tape substrate width and the masking tape cover substrate width, and the width direction end of the masking tape substrate and the masking tape cover substrate The widthwise end portion of is characterized in that a space where the adhesive is not applied is provided. It is said that the upper layer can be easily pulled off by this.

JP 2005-29953 A JP, 2014-173038, A

  As in Patent Document 1, when affixing reinforcing fibers of two or more layers in order to achieve a desired reinforcing strength, it is necessary to repeat the cornering masking operation and the masking sheet removal operation a plurality of times, and the construction worker can The work load was excessive.

  By using a multilayer masking material as in Patent Document 2, the number of masking operations can be reduced.

  However, in the process of reinforcement with reinforcing fibers, it is necessary to impregnate a resin having a higher viscosity than that of a normal coating method, and it is difficult to peel off even by a masking material having a multilayer structure as disclosed in Patent Document 2. Also had. That is, when the resin (undercoating and top coating) is applied to the reinforcing fiber sheet, the resin also covers the periphery of the masking sheet, so that the construction worker may grasp the masking sheet even in a configuration without an adhesive layer in the periphery. It was difficult. Moreover, the multilayer masking material of patent document 2 is not considered at all regarding peeling of the second layer. Such a reduction in work efficiency may be a serious problem, for example, when constructing a large area such as a floor slab on a highway or the like.

  Therefore, an object of the present invention is to make it possible to reduce the number of corner-out masking operations even when attaching a continuous fiber sheet to multiple layers, and keep good workability in corner-out masking. And it is providing the masking sheet | seat which the operation | work in the case of peeling is easy.

  In the present invention, it is a multilayer masking sheet in which a plurality of rectangular single layer masking sheets including a masking sheet substrate and an adhesive layer are laminated, wherein each single layer masking sheet is opposed to the first side of the masking sheet substrate The pressure-sensitive adhesive layer is provided along the outer edge of the second side, and a non-adhesive area is formed substantially in the center toward the fourth side opposite to the third side different from the first and second sides. A corner masking multilayer masking sheet is provided, characterized in that it is provided.

  Further, in the present invention, at least a band-like reinforcing fiber is installed in the first direction at a predetermined distance on the lower surface of the road floor plate and impregnated with a resin, and the band-like reinforcing fiber is further impregnated in the first direction. A reinforcement method for a road floor slab, which is installed at predetermined intervals in a second direction orthogonal to the above and impregnated with resin to form a grid-like fiber reinforced resin structure to reinforce at least the band-like reinforcing fibers Before setting a predetermined distance in the first direction, the corner masking multilayer masking sheet is disposed on the uncoated portion of the grid-like fiber reinforced resin structure, and after resin impregnation in each direction, sequentially There is provided a method of reinforcing a road slab, comprising the step of peeling the upper masking sheet substrate on the basis of the non-adhesive area.

  In the present invention, by forming the masking sheet in multiple layers, the number of cornering masking operations is reduced, and a tack-free area is provided substantially at the center of each layer from one end of the masking sheet substrate to the other end opposite thereto. The peeling removal of the masking sheet becomes easy, and the workability is remarkably improved.

The figure explaining the single layer sheet structure used for the multilayer masking sheet of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional view and top view which become an example of the multilayer masking sheet | seat of this invention. The top view of the reinforcement process using the multilayer masking sheet of this invention. Process sectional drawing of the reinforcement process using the multilayer masking sheet | seat of this invention. The flow sheet of the reinforcement process using the multilayer masking sheet of this invention. Flow sheet of reinforcement process disclosed in Patent Document 1.

The multilayer masking sheet of the present invention, as shown in FIG. 1, adheres along the outer edge of the second side b opposite to the first side a of the square masking sheet substrate 1 (which may hereinafter be simply referred to as the substrate). An adhesive layer A is formed to form an adhesive area A, and an area without an adhesive layer 2 at a substantially central portion from a third side b different from the first and second sides to an opposing fourth side d It is formed by laminating two or more single-layer masking sheets (which may be simply referred to as single-layer sheets) in which the non-adhesive area B is formed by arranging the anti-adhesive film 3. The number of single-layer sheets to be bonded can be appropriately selected in accordance with the required number of times of masking (the number of laminated continuous fiber sheets). In (a), the example which the adhesion area | region A and the non-adhesive area B are provided with respect to the base material 1 of 1 sheet is shown. In (b), the cut part 4 is put in the base material 1, and it is set as 2 sheets, and the adhesion area A and the non-adhesive area B are provided in each. In (c), the overlapping portion 5 is provided by partially overlapping one of the separated single-layer sheets on the other. The cut portion 4 and the overlapping portion 5 are formed in the non-adhesive region B along the extending direction. These single layer sheets can be arbitrarily combined to form a multilayer masking sheet. When laminating three or more layers, it may have a known sheet or layer other than the above-mentioned single layer sheet. The direction in which the layers are laminated is not particularly limited. However, when laminating the single-layer sheet shown in (b) or (c), the cut portion 4 or the cut portion 4 is formed by laminating in the direction in which the extension direction of the non-adhesive area B is orthogonal. The multilayer masking sheet can be formed without being separated by the overlapping portion 5. Moreover, also when laminating | stacking (a), it can bond together in the direction which the non-adhesive area | region B orthogonally crosses.
The width (direction ac) of the adhesive area A and the non-adhesive area B is not particularly limited as long as a desired adhesive strength can be obtained, but for example, the width of the non-adhesive area B is From the viewpoint of facilitating peeling of the layer sheet, for example, the thickness may be 5 to 60 mm, preferably 10 to 50 mm, and more preferably 20 to 40 mm. In the case where a cut portion or an overlapping portion is provided, it is preferable to have a width that allows the base material to be separated and held at the portion. Further, the position between the sides a and c of the non-adhesive area B may be a substantially central portion, and may be unevenly distributed closer to the side a or the side c within a range not impairing the effect of the present invention. Furthermore, the non-adhesive area B does not have to be parallel to the side a and the side c, and may be located substantially at the center. Further, the side on the non-adhesive region B side of the pressure-sensitive adhesive layer 2 (the side of the anti-adhesive film facing the side a and the side c when the anti-adhesive film is disposed) does not have to be straight. It can have various shapes such as a wavy shape, a bowl shape (a letter shape or a zigzag shape), and a U shape.

  FIG. 2 is a view showing an example of a multilayer masking sheet formed by laminating two single layer sheets shown in (b1) of FIG. 1 (b). (A1) and (a2) are cross-sectional views, (b1) and (b2) are plan views, (a1) is a cross-section of (b1) and (b2) along the X1-X2 cross section, (a2) is (b1) and (b1) 7 shows a Y1-Y2 cross section of b2). As shown in the figure, the multi-layer masking sheet is bonded on the release liner 8 in the direction in which the non-adhesive areas of the single-layer sheets are orthogonal to each other. Here, the non-adhesive regions are the void portions 6 and 7 without providing the pressure-sensitive adhesive layer. The lower pressure-sensitive adhesive layer 2-1 adheres to the base concrete surface, and thus has a higher adhesion than the upper pressure-sensitive adhesive layer 2-2. In the base materials 1-1 and 1-2, cut portions 4-1 and 4-2 are provided, respectively.

The substrate 1 is not particularly limited, but may be a conventionally known paper, cloth, or a film or non-woven fabric made of synthetic resin such as polyester, rayon, nylon, polyamide, polyethylene, polypropylene, acrylic or vinyl chloride. Be Paper, cloth, non-woven fabric and the like may be impregnated with a sealing resin. Moreover, these base materials may be a thing of only a single | mono layer, and what (laminated base material) which laminated | stacked two or more layers may be sufficient. Representative examples of the laminated base include a base obtained by laminating a resin layer such as polyethylene on one side or both sides of a cross woven fabric using cloth or polyethylene flat yarn.
In addition, on one side or both sides of the base material, there may be any other layer such as an easy adhesion layer or a release layer. Furthermore, a tab can be provided on a part of the substrate in an amount that does not affect the masking to facilitate peeling.

  The thickness of the substrate is not particularly limited as long as the resin does not penetrate into the substrate and the strength as the masking sheet can be maintained. For example, the thickness of the substrate can be in the range of 5 μm to 200 μm, preferably 10 to 100 μm. From the viewpoint of maintaining the strength of the entire multilayer masking sheet, it is preferable to use a substrate thicker than other upper layer substrates as the substrate of the lowermost layer masking sheet.

The pressure-sensitive adhesive layer 2 is not particularly limited, and examples thereof include conventionally known pressure-sensitive adhesives, such as rubber-based pressure-sensitive adhesives and acrylic pressure-sensitive adhesives. Moreover, as a lowermost pressure-sensitive adhesive layer in contact with a concrete member such as a road floor plate, an epoxy-based adhesive, a urethane-based adhesive, a silicone-based adhesive, a rubber-based adhesive, a vinyl ester-based adhesive, a polyester-based adhesive, It can also be selected from one or more pressure-sensitive adhesives selected from the group consisting of polymer cement-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives and polyolefin-based pressure-sensitive adhesives.
The thickness of the pressure-sensitive adhesive layer can be, for example, in the range of 5 μm to 200 μm, preferably 10 to 100 μm.
The pressure-sensitive adhesive layer 2 is provided along the outer edge of the second side (c side) opposite to the first side (a side) of the masking sheet substrate, but “along the outer edge” does not necessarily mean that the substrate is It does not mean that the outer edge of the outer edge and the outer edge of the pressure-sensitive adhesive layer coincide with each other, and the pressure-sensitive adhesive layer 2 is provided receding from the outer edge of the substrate if it does not affect the releasability. May be In addition, it is more preferable that the outer edge of a base material and the outer edge of an adhesive layer correspond.

The anti-adhesive film 3 is excellent in adhesiveness with the pressure-sensitive adhesive layer 2 and any material which does not penetrate the pressure-sensitive adhesive can be used. For example, various resin films and metal foils can be used.
The release liner 8 can be used without particular limitation as long as it is a material that can be easily peeled off from the lowermost pressure-sensitive adhesive layer 1-1.

  The size of the multilayer masking sheet may be any size in accordance with the cornering area to be set, and is not particularly limited. In general, it is preferable to standardize to some extent, for example, a square of 100 mm × 100 mm, or the like. In addition, usually, the shape of the multilayer masking sheet is a rectangle such as a square in order to reinforce the floor slab by making the continuous fiber sheets orthogonal to each other. In the case, the shape may be a parallelogram (including a rhombus), a trapezoid, or the like.

  The method for producing the multilayer masking sheet is not particularly limited, but the pressure-sensitive adhesive may be partially coated or continuously applied on a long base material by a method such as roll coating, die coating, calendar coating, reverse coating, gravure coating, knife coating, etc. The coating is performed, and the coated single layer masking sheet is temporarily wound up. About the single layer masking sheet which applied the whole surface, the adhesion prevention film 3 is bonded on the adhesive surface, and it winds up once. The first masking sheet (upper layer masking sheet) is laminated on the second masking sheet (lower layer masking sheet). A desired number of single layer masking sheets are laminated in the same manner, and the release liner 8 is further bonded to the adhesive surface of the lowermost single layer masking sheet. Then, a multilayer masking sheet is manufactured by performing a punching process to a predetermined shape.

  3 to 4 are views for explaining the cornering process in reinforcement of a floor slab using a continuous reinforcing fiber sheet (reinforcing fiber) using a multilayer masking sheet according to the present invention, and FIG. 3 is a plan view, FIG. The cross section is shown. In addition, in FIG. 4, since it is originally installed on the lower surface of a floor slab, the upper and lower sides are reverse to the actual. Moreover, FIG. 5 is a flow sheet explaining the reinforcement process using the multilayer masking sheet which concerns on this invention.

  As shown in FIG. 5, Keren (S1) on the lower surface of the floor plate is performed as in the conventional case, and then a primer is applied to the base. The corner portion masking (S2) of the lattice portion is performed, and further, the primer treatment (S3) is performed, and the non-landing correction (S4) is performed to form the base. The corner mask for the primer of S2 may use the multilayer masking sheet according to the present invention, but here, an example of conventional masking will be described. In the primer coating, since the thickness of the primer layer is thin, the workability is relatively good even using a conventional masking material. The cross section after inland correction is shown in FIG. 4 (a). The primer layer 11 is formed on the floor plate 10, and the primer layer is not formed on the corner portion.

  Next, the multilayer masking sheet according to the present invention is attached, and corner masking for reinforcing fibers is performed (FIG. 5: S5, FIG. 4 (b)). Next, resin undercoating, first layer reinforcing fiber bonding (FIG. 5: S6), resin top coating are performed, and resin impregnation is carried out (FIG. 5: S7). The first layer reinforcing fiber 12 extends in the Y direction (also referred to as a first direction) in FIG. The X-Y direction in FIG. 3 is the same as the X-Y direction in FIG. Here, one cornered portion is shown, but in practice, as shown in FIGS. 1 and 2 of Patent Document 1, a plurality of band-like first layer reinforcing fibers 12 are attached, and the cornered portion between them That is, a corner portion is provided in the vicinity of the intersection of the first layer reinforcing fiber 12 and the second layer reinforcing fiber 14 in a portion where the both do not overlap (referred to as a non-covered portion). The X1-X2 cross section of FIG. 3 (a) after resin 13 impregnation is shown in FIG. 4 (c). At this time, a part of the resin 13 may intrude into the void 6 under the lower layer masking sheet substrate 1-1 from the sides a and c, but the cut portion 4-1 is formed in the lower layer masking sheet substrate 1-1. By providing or forming the overlapping portion 5 as shown in FIG. 1C, there is no influence on the removal workability of the lower layer masking sheet base material 1-1 in the later step. In addition, an anti-adhesive film may be attached to the non-adhesive area so that the void 6 is not formed. The state which removed the upper layer masking sheet base material 1-2 is shown in FIG.4 (d). Here, the adhesive layer 2-2 is shown to remain on the lower layer masking sheet substrate 1-1, but the adhesive layer 2-2 is to be removed together with the upper layer masking sheet substrate 1-2. The adhesion of the lower layer masking sheet substrate 1-1 may be lowered.

  Conventionally, as shown in FIG. 6, the masking sheet is removed after resin impregnation (FIG. 6: S8 ′), and a masking sheet is newly attached (FIG. 6: S9 ′). By removing the masking sheet base material 1-2 (FIG. 5: S8), the lower layer masking sheet base material 1-1 remains, and new masking sheet sticking becomes unnecessary. Moreover, in order to remove the masking sheet base material 1-2 of the upper layer from the notch | incision 4-2, peeling from the center part which resin does not adhere easily becomes easy normally. Even if a base material not provided with the cut-in portion 4-2 or the overlapping portion 5 is used as the upper layer, the construction worker inserts a finger or a jig into the space 7 and the peeling and removal of the base material 1-2 is easy Become.

  Subsequently, in the same manner as the first layer reinforcing fiber bonding, resin undercoating, second layer reinforcing fiber 14 bonding (FIG. 5: S9), resin top coating are performed, and resin impregnation is performed (FIG. 5: S10). The second layer reinforcing fiber 14 is attached and extended in the X direction (also referred to as a second direction) as shown in FIG. 3 (b). FIG.4 (e) shows the Y1-Y2 cross section of FIG.3 (b).

Thereafter, the lower layer masking sheet is removed (FIG. 5: S11) and cured (FIG. 5: S12). As a result, a lattice-like fiber reinforced resin structure (FRP) in which reinforcing fibers are disposed in the resin matrix is formed, and reinforcement of the lower surface of the road floor slab becomes possible. Moreover, the non-coated portion from which the multilayer masking sheet according to the present invention has been removed exposes the concrete surface of the lower surface of the floor slab, so that it is possible to observe cracks and the like with time, and it is possible to prevent stagnation of penetrating water.
As described above, in the present invention, when the second layer reinforcing fiber is attached, it is not necessary to newly set a cornering masking sheet. Moreover, after attaching the first layer reinforcing fiber, it is difficult to ensure accuracy in terms of workability by newly installing a masking sheet for cornering, but in the present invention, masking for one cornering is performed once. Accuracy is also greatly improved because it is only necessary to do. Moreover, when peeling each single layer masking sheet, peeling workability improves by peeling on the basis of a non-adhesive area.

Furthermore, those having the overlapping portion 5 as shown in FIG. 1 (c) or those obtained by bonding the substrates having the notched portion 4 as shown in FIG. 1 (b) in the direction orthogonal to each other Even if the resin adheres to the surface, it is difficult to reach the concrete surface of the floor slab, which is preferable.
For other details of the floor plate reinforcing method using reinforcing fibers, the description in Patent Document 1 etc. can be referred to.

  The present invention will be described in detail by way of examples, but the present invention is not limited to the contents described in the examples. In addition, "part" shows a mass part.

(Base material)
The base material (125 micrometers in thickness) which laminated the polyethylene resin layer on the both sides of the cross woven fabric of a polyethylene flat yarn and polyester yarn was prepared.

(Adhesive)
An acrylic polymer having a solid content of 50% was obtained by polymerizing 97 parts of 2-ethylhexyl acrylate and 3 parts of acrylic acid in a solvent using 2,2'-azobis (isobutyronitrile) as an initiator. An acrylic pressure-sensitive adhesive including 100 parts of this acrylic polymer as a base polymer and 1 part of an isocyanate-based curing agent (manufactured by Soken Chemical Co., Ltd., trade name L-45) was prepared.

(Single layer masking sheet)
The acrylic pressure-sensitive adhesive was continuously applied partially on one surface of the substrate by a roll coating method so that the thickness of the pressure-sensitive adhesive layer was 30 μm and the width of the portion without the pressure-sensitive adhesive layer was 30 mm.

(Laminated masking sheet)
The first single layer masking sheet (upper layer masking sheet) was laminated at the desired location on the second single layer masking sheet (lower layer masking sheet). Furthermore, a multi-layered masking sheet was manufactured by laminating a release liner on the adhesive surface of the lowermost single-layer masking sheet and leaving only the release liner in the shape of 100 mm × 100 mm to perform seal removal processing (half cut). .

  Although the example which applied the multilayer masking sheet which concerns on this invention to the reinforcement process of a road floor slab was demonstrated by the above description, this invention is not limited only to such a floor board reinforcement, Many cornering operations are required It is also possible to apply to other fields such as a painting process that

Reference Signs List 1 base material 2 pressure-sensitive adhesive layer 3 anti-adhesive film 4 incision 5 overlapping portion 6, 7 void 8 release liner 10 floor plate 11 primer layer 12, 14 reinforcing fiber 13, 15 resin A adhesive area B non-adhesive area

Claims (6)

  A multilayer masking sheet in which a plurality of rectangular single-layer masking sheets including a masking sheet substrate and an adhesive layer are laminated, wherein each single-layer masking sheet is opposed to the first side of the masking sheet substrate. The pressure-sensitive adhesive layer is provided along the outer edge of the side, and a non-adhesive area is provided in a substantially central portion toward the fourth side opposite to the third side different from the first and second sides. Features a multilayer masking sheet for cornering.   The cornering multilayer masking sheet according to claim 1, wherein the non-adhesive area is an area where the pressure-sensitive adhesive layer is not provided.   The multilayer masking sheet for cornering according to claim 1, wherein the non-adhesive area is an area where an anti-adhesive film is attached on the pressure-sensitive adhesive layer.   In the non-adhesive area, the masking sheet substrate has a cut portion or an overlapping portion in which a part of the masking sheet substrate is overlapped along the extending direction of the non-adhesive region. The multilayer masking sheet for cornering given in any 1 paragraph of 3.   The single-layer masking sheet of the lower layer and the single-layer masking sheet of the upper layer stacked on the lower-layer masking sheet are laminated such that the extension directions of the non-adhesive areas are orthogonal to each other. The corner masking multilayer masking sheet according to any one of claims 1 to 4.   At least a band-like reinforcing fiber is installed in the first direction at a predetermined interval on the lower surface of the road slab, and impregnated with a resin, and the band-like reinforcing fiber is secondly orthogonal to the first direction. In a method of reinforcing a road slab, which is installed with predetermined intervals in a direction and impregnated with resin to form a grid-like fiber reinforced resin structure to reinforce, at least the strip-like reinforcing fibers in the first direction The multi-layered masking sheet for cornering according to any one of claims 1 to 5 is disposed on the non-coated portion of the grid-like fiber reinforced resin structure before setting a predetermined interval, A method of reinforcing a road slab, comprising the steps of: sequentially peeling off the upper masking sheet substrate on the basis of the non-adhesive area after resin impregnation of the above.

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