WO2021131922A1 - Masking sheet and method for reinforcing road floor slab using same - Google Patents

Masking sheet and method for reinforcing road floor slab using same Download PDF

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Publication number
WO2021131922A1
WO2021131922A1 PCT/JP2020/046815 JP2020046815W WO2021131922A1 WO 2021131922 A1 WO2021131922 A1 WO 2021131922A1 JP 2020046815 W JP2020046815 W JP 2020046815W WO 2021131922 A1 WO2021131922 A1 WO 2021131922A1
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WIPO (PCT)
Prior art keywords
masking sheet
base layer
masking
sheet
layer
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PCT/JP2020/046815
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French (fr)
Japanese (ja)
Inventor
幹郎 細井
晋二 小川
健二 柳原
章弘 福原
奥田　裕一
Original Assignee
株式会社寺岡製作所
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Application filed by 株式会社寺岡製作所 filed Critical 株式会社寺岡製作所
Priority to JP2021567317A priority Critical patent/JP7282921B2/en
Publication of WO2021131922A1 publication Critical patent/WO2021131922A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges

Definitions

  • the present invention relates to a masking sheet used when applying a resin composition and a method for reinforcing a road deck using the masking sheet.
  • a masking sheet is attached to a place where the paint of the object to be painted does not want to adhere, and after applying the paint to a desired part, the masking sheet is applied.
  • the paint adheres to the outer surface of the masking sheet, that is, the surface of the masking sheet opposite to the surface to be attached to the object to be coated, in the same manner as the painted portion of the object to be coated.
  • the outer surface of the masking sheet has a property that the adhered paint does not drip and the film after painting does not peel off from the masking sheet. Therefore, it is common to attach and remove the masking sheet for each coating.
  • Patent Document 1 a method of arranging continuous sheets arranged on the lower surface of the deck in a grid pattern has been proposed (Patent Document 1). According to this method, since an exposed portion that is not covered by the continuous fiber sheet is formed on the lower surface of the deck, it is possible to easily observe the state of cracks in concrete, and the presence of the exposed portion makes it possible to easily observe the upper surface of the deck. It is possible to prevent the permeated water from staying between the concrete portion on the lower surface of the deck and the continuous fiber sheet.
  • a method of impregnating the continuous fiber sheet with a curable resin composition and converting it into a fiber reinforced plastic (FPR) material is adopted.
  • FPR fiber reinforced plastic
  • a plurality of continuous fiber sheets are installed in parallel in one direction, and then a plurality of continuous fiber sheets are installed in orthogonal directions to perform the grid-like installation.
  • the applicant is a multi-layer masking sheet in which a plurality of square single-layer masking sheets including a base material and an adhesive layer are laminated, and each single-layer masking sheet faces the first side of the masking sheet base material.
  • the adhesive layer is provided along the outer edge of the second side, and a non-adhesive region is provided in a substantially central portion from a third side different from the first and second sides toward a fourth side facing the first side.
  • Patent Document 2 proposes a multi-layer masking sheet for cornering, which is characterized by the above.
  • This multi-layer masking sheet for cornering is arranged in the non-covered portion when the bands of the reinforcing fibers are arranged in a grid pattern in the road deck reinforcement using the reinforcing fibers, and the coating of the resin composition for curing the reinforcing fibers is performed. At that time, the adhesion of the resin composition to the floor slab is suppressed.
  • This multi-layer masking sheet can be applied to a large number of times with a single corner by sequentially peeling off the upper single-layer sheet after the resin composition is applied. Become. In the masking sheet, a new base material appears on the surface at each coating and is peeled off together with the coated resin composition.
  • a material that does not repel the resin composition for example, paper, cloth, or a film or non-woven fabric made of various synthetic resins, is used as a base material. Therefore, conventionally, it has been necessary to peel off the masking tape between the first coating of the resin composition and the next coating.
  • an object of the present invention is to provide a masking sheet that does not require the masking sheet to be peeled off each time the resin composition is applied or impregnated.
  • a further object of the present invention is to provide a method for reinforcing a floor slab using the masking sheet.
  • the present invention provides a masking sheet in which the number of masking and peeling is only one by laminating a base layer having poor paint adhesion on the adhesive sheet.
  • a masking sheet is provided in which the base layer is arranged on the other end side of the surface of the masking sheet, and the outer surface of the base layer corresponding to the outer surface of the masking sheet is a surface having an ethanol contact angle of 30 ° or more.
  • At least strip-shaped reinforcing fibers are installed on the lower surface of the road deck at predetermined intervals in the first direction and impregnated with resin, and further, the strip-shaped reinforcing fibers are impregnated in the first direction.
  • the above masking sheet is applied to the lattice.
  • a method for reinforcing a road deck is provided, which comprises a step of arranging the shape of the fiber reinforced resin structure in an uncoated portion.
  • the masking sheet of the present invention can repel the resin composition on the outer surface thereof, and the next resin composition can be coated / impregnated without peeling a plurality of times. It can be carried out. As a result, masking and peeling can be completed only once by a road deck reinforcement method or the like, and workability is improved.
  • the masking sheet in masking for painting, the masking sheet (tape) repelling the paint may impair the smoothness of the painted surface, so it has not been adopted. Therefore, a conventional masking sheet for painting has been adopted even when the smoothness of the coated surface of the resin composition is not so required, such as reinforcement of reinforcing fibers. Further, since the masking sheet needs to be peeled off after coating, it is important that the masking sheet can be easily peeled off. However, in the conventional masking sheet, each coating is peeled off before the resin composition is cured. Otherwise, it will be difficult to peel off the resin composition after curing.
  • the resin composition is formed a plurality of times. We have obtained the finding that peeling can be easily performed even when exposed to coating and impregnation of objects.
  • the number of masking and peeling can be performed only once, and the workability is improved.
  • the masking sheet of the present invention is a masking sheet in which at least a base layer and an adhesive sheet having an adhesive layer are laminated, and the adhesive layer is arranged on one end side of the surface of the masking sheet, and the masking is performed.
  • the base layer is arranged on the other end side of the surface of the sheet, and the outer surface of the base layer corresponding to the outer surface of the masking sheet is a masking sheet having an ethanol contact angle of 30 ° or more.
  • the adhesive layer is attached to the adhesive surface to be masked, such as a concrete deck, and the base layer faces the surface of the outer surface of the masking sheet opposite to the adhesive layer.
  • the contact angle of ethanol is 30 ° or more
  • the contact angle of ethanol with respect to the target surface is 30 ° or more.
  • it is referred to as “ethanol contact angle”.
  • the "outer surface of the base layer corresponding to the outer surface of the masking sheet” may be referred to as the “outer surface of the base layer” or simply the “outer surface”.
  • the base layer used for the masking sheet of the present invention may have an ethanol contact angle of 30 ° or more on the exposed surface (outer surface) after being attached to the surface to be attached.
  • materials capable of realizing such properties include silicone resin, silicone rubber, fluorine-based resin, fluorine-based rubber, fluorinated silicone resin, and fluorinated silicone-based rubber. A film of these materials may be used as a base layer.
  • the outer surface of a known film material such as a polyethylene (PE) film, a polyethylene terephthalate (PET) film, or a polypropylene (PP) film is subjected to a mold release treatment using a fluorine-based resin, a silicone-based resin, a silicone-based rubber, or the like. Therefore, the outer surface of the masking sheet can have an ethanol contact angle of 30 ° or more.
  • the ethanol contact angle specified in the present invention was measured by the static drip method in the "wetting property test method for the surface of the substrate glass" of JIS R 3257.
  • the outer surface can repel the adhered resin composition, and even after a plurality of coatings of the resin composition, the outer surface has a thick resin composition.
  • the film of the object is not formed and can be easily peeled off.
  • the higher the contact angle, the better the resilience of the resin composition, and the contact angle is preferably 32 ° or more, more preferably 35 ° or more.
  • the outer surface of the base layer may be roughened by embossing to provide unevenness.
  • the surface roughness (arithmetic mean roughness Ra) of the outer surface of the roughened base layer is preferably 3 ⁇ m or more and 30 ⁇ m or less. Within this range, the roughening effect can be obtained, and the resin composition is less likely to remain in the recesses.
  • the type of fluororesin or fluororubber is not particularly limited, but is polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene.
  • PTFE polytetrafluoroethylene
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • PCTFE polychlorotrifluoroethylene
  • FEP -Hexafluoropropylene copolymer
  • PETFE tetrafluoroethylene-ethylene copolymer
  • PVdF polyvinylidene fluoride
  • vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer vinylidene fluoride-tetra Fluororesin-containing rubber such as a fluoroethylene copolymer and an ethylene-tetrafluoroethylene copolymer can be used.
  • PTFE polytetrafluoroethylene
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • the type of silicone resin or silicone rubber is not particularly limited, peroxide curing type silicone rubber, addition reaction type silicone rubber, a structure consisting of D units, such as condensation reaction type silicone rubber [(CH 3) 2 SiO] Examples thereof include those in which a functional group is introduced into a long-chain polymer of a polydimethylsiloxane having, if necessary.
  • M unit (R 3 SiO 1/2 ), Q unit (SiO 2 ), T unit (RSiO 3/2 ) and T unit (RSiO 3/2) of peroxide-curable silicone resin, addition reaction type silicone resin, condensation reaction type silicone resin, etc. Includes organopolysiloxanes having at least one unit selected from D units (R 2 SiO).
  • the resin or rubber used as these raw materials may be used alone, or may be a mixture of two or more, or a laminated product thereof. Further, it may be a composite material with another material.
  • Examples of raw materials for silicone-based rubber include KE-1950-10 (A / B), KE-1950-20 (A / B), and KE-1950-30 (A / B) manufactured by Shin-Etsu Chemical Co., Ltd. , KE-1987 (A / B), KE-1988 (A / B), LR7665 series manufactured by Asahi Kasei Wacker Silicone Co., Ltd., LR3033 series, TSE3032 series manufactured by Momentive Co., Ltd. and the like can be used.
  • fluorinated silicone-based release agent examples include modified silicone having a fluorine substituent such as a perfluoroalkyl group or a perfluoropolyether group in the main chain. These are usually bonded with functional groups such as alkenyl groups and hydrosilyl groups that can form a crosslinked structure by reaction (curing).
  • fluorinated silicone-based release agent examples include X-70-201, X-70-258, KP-911 manufactured by Shin-Etsu Chemical Co., Ltd., and FS1265-300CS manufactured by Toray Dow Corning Co., Ltd. , FS1265-1000CS, FS1265-10000CS, BY24-900, BY24-903, SYL-OFF Q-7785, SYL-OFF Q-7795, SYL-OFF Q-7755 and the like.
  • the pressure-sensitive adhesive layer is not particularly limited, and conventionally known pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, acrylic-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and vinyl ester-based pressure-sensitive adhesives. It is also possible to select from one or more kinds of pressure-sensitive adhesives selected from the group consisting of polyester-based pressure-sensitive adhesives, polymer cement-based pressure-sensitive adhesives, and polyolefin-based pressure-sensitive adhesives.
  • the thickness of the pressure-sensitive adhesive layer is, for example, 5 ⁇ m to 500 ⁇ m, and can be set according to the roughness and curvature of the adhesive surface, workability when peeling the masking sheet, and the like.
  • the pressure-sensitive adhesive sheet has a pressure-sensitive adhesive layer and is laminated with a base layer.
  • the pressure-sensitive adhesive sheet may be composed of only the pressure-sensitive adhesive layer, or may be formed by laminating and integrating one or two or more other layers (hereinafter, referred to as “complementary layer”) and the pressure-sensitive adhesive layer.
  • a conventionally known material such as a resin film such as a polyethylene (PE) film, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a woven fabric containing a fiber thread, or a knitted fabric can be used.
  • a resin film such as a polyethylene (PE) film, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a woven fabric containing a fiber thread, or a knitted fabric
  • PET polyethylene terephthalate
  • PP polypropylene
  • the adhesive surface may be protected by a protective sheet (also referred to as a release liner) such as a release paper until just before the masking sheet is used.
  • FIG. 1 shows a schematic cross-sectional view as an example of the masking sheet 5 according to the present invention.
  • FIG. 1A shows a masking sheet 5 in which a base layer 1 is composed of a base material 2 and is laminated and integrated with an adhesive layer 4 which is an adhesive sheet 3.
  • the base material 2 is made of PTFE or the like, and the outer surface 1'is maintained at an ethanol contact angle of 30 ° or more.
  • the base material 2 of the base layer 1 is made of PET or the like, and a silicone resin or the like is applied to the outer surface 1'to make the ethanol contact angle 30 ° or more, and the mold is released.
  • the surface 6 is formed, and the base layer 1 is laminated and integrated with the adhesive sheet 3.
  • the auxiliary layer 7 is arranged on the base material 2 side of the pressure-sensitive adhesive layer 4 in order to increase the thickness of the masking sheet 5 and improve the workability at the time of sticking and peeling. Further, in order to improve the bondability between the complementary layer 7 and the base material 2, the bonding layer 8 is arranged on the contact surface of the base layer 1 with the complementary layer 7. In FIG. 1D, the pressure-sensitive adhesive layer 4 is also arranged between the complementary layer 7 and the bonding layer 8 for the purpose of further increasing the thickness from the configuration of FIG. 1C.
  • FIG. 1 (e) is a configuration in which the same base material 2 as in FIG. 1 (a) is arranged on the outer surface 1'in the configuration of FIG. 1 (d).
  • the outer surface 4'of the pressure-sensitive adhesive layer 4 can be protected by a protective sheet (not shown) or the like before use.
  • a configuration including such a protective sheet (release liner) is also within the scope of the present invention.
  • the protective sheet in order to make the protective sheet easy to peel off, it is preferable that a part of the protective sheet protrudes from the adhesive layer 4.
  • the base layer 1 may be larger than the pressure-sensitive adhesive sheet 3, and a part or all of the side surfaces of the pressure-sensitive adhesive sheet 3 may be covered with the base layer 1.
  • the size of the masking sheet may be any size that matches the area to be masked, and is not particularly limited.
  • a long masking sheet may be wound around the core in a roll shape, or may be standardized into, for example, a quadrangle of 100 mm ⁇ 100 mm according to the shape of the surface to be attached.
  • the shape of the masking sheet is usually a rectangle such as a square because the continuous fiber sheets are orthogonal to each other to reinforce the deck.
  • the shape may be a parallelogram (including a rhombus), a trapezium, or the like.
  • the thickness of the masking sheet is preferably a thickness corresponding to the thickness of the reinforcing fiber material to be laid.
  • the total thickness after integration) is preferably 0.2 mm or more and 5.0 mm or less. More preferably, the thickness is 0.4 mm or more and 2.0 mm or less. If the thickness of the masking sheet is less than 0.2 mm, the masking sheet may be buried in the reinforcing fiber material, making it difficult to peel it off. Further, when the thickness of the masking sheet is larger than 5.0 mm, the trowel or roller used for impregnating the reinforcing fibers with the resin composition may interfere with the masking sheet and the workability may be deteriorated.
  • the manufacturing method of the masking sheet is not particularly limited, but the adhesive sheet can be continuously applied on the base layer by a method such as roll coating, die coating, calendar coating, reverse coating, gravure coating, knife coating and the like. It is also possible to prepare the base layer and the pressure-sensitive adhesive sheet by a known method, and then bond the base layer and the pressure-sensitive adhesive sheet together. Further, the base layer may be formed in a laminated shape by melt-molding pellets as a raw material of the base layer on the base layer side of the pressure-sensitive adhesive sheet.
  • the release-treated surface can be formed by applying the above-mentioned fluorinated silicone, silicone-based resin, or the like to the base material. Further, a silicone-based adhesive or the like is used for the bonding layer, and a commercially available silicone-based primer can be selected for the undercoat layer.
  • FIG. 2 shows the lower surface side of the road deck reinforced by the method according to one embodiment of the present invention.
  • the reinforcing fiber sheet 22 is arranged in a grid pattern on the lower surface of the road deck 21, and the reinforcing fiber sheet 22 is impregnated with the resin composition to form a lattice structure of the reinforcing fiber sheet 22 and adhered to the lattice structure.
  • Reference numeral 23 denotes an exposed portion that is not covered by the continuous fiber sheet.
  • the masking sheet 31 according to the present invention is attached to the exposed portion 23 to perform masking.
  • strip-shaped reinforcing fibers 32 are installed on the lower surface of the road deck at predetermined intervals in the first direction to impregnate the resin, and another strip-shaped reinforcing fiber 33 is added to the first strip-shaped reinforcing fibers 33. It is installed at a predetermined interval in the second direction orthogonal to the direction of the above, impregnated with resin, and a grid-like fiber reinforced resin structure is formed and reinforced.
  • FIG. 4 is a diagram illustrating a floor slab reinforcing step using the masking sheet according to the present invention, and shows a cross-sectional view corresponding to line AA of FIG.
  • the underside of the floor slab is cleaned (base treatment) in the same manner as in the conventional process.
  • the construction range is assigned and marked out, and the masking sheet of the present invention is attached to the exposed portion 23 in FIG. 2 for masking (FIG. 4 (a)).
  • pretreatment such as coating of primer 42, non-landing treatment, and marking out is performed (FIG. 4 (b)
  • the undercoat of the resin composition 43 and the first layer of reinforcing fibers 32 are attached (FIG. 3).
  • Pasting extending in the left-right direction also referred to as "first direction”
  • top coating of the resin composition 43, impregnation of the reinforcing fibers of the resin composition 43, and the like are performed (FIG. 4 (c)).
  • the undercoat of the resin composition 44 and the second layer reinforcing fiber 33 are attached (in the vertical direction (also referred to as “second direction”) in FIG. (Extended pasting), topcoating and impregnation of the resin composition 44 (FIG. 4 (d)).
  • the resin composition does not develop and adhere to the entire outer surface 1'. Since it adheres to the polka dots (43D, 44D) as shown in 4 (c) and 4 (d), the masking sheet 5 is not buried in the resin composition, and the peeling operation can be performed satisfactorily. Further, when the base layer 1 has the configuration shown in FIGS. 1A and 1E, the layer that repels the resin composition has a certain thickness, so that the resin composition 44 is also repelled on the side surface of the base layer 1. (R part in FIG. 4D), which makes the peeling work easier.
  • the masking sheet 31 is removed and cured.
  • a grid-like fiber reinforced plastic structure (FRP) in which reinforcing fibers are arranged in the resin matrix is formed, and the lower surface of the road deck can be reinforced.
  • the concrete surface on the lower surface of the floor slab is exposed, so that cracks and the like can be observed over time, and the retention of permeated water can be prevented.
  • the two layers of the reinforcing fibers are attached, only one masking is required, so that the masking accuracy is remarkably improved as compared with the case where the masking is performed every time the reinforcing fibers are attached. To do.
  • the masking sheet peeling step may be performed only once, the workability is improved.
  • the resin composition can be prevented from spreading to the outer surface of the base layer by flipping the resin composition from the side surface to the upper surface of the base layer.
  • Patent Document 1 For other details of the floor plate reinforcing method using reinforcing fibers, the description of Patent Document 1 and the like can be referred to.
  • the resin composition to be impregnated with the reinforcing fibers is generally an epoxy-based one, and a room temperature-curable epoxy-based resin composition is more preferable.
  • the resin is cured by curing at room temperature after coating without going through a heating step, and a reinforcing effect can be obtained.
  • Table 1 shows the material and composition of each base layer, the contact angle of ethanol with respect to the outer surface 1'(FIG. 1), and the surface roughness.
  • the contact angle with alcohols other than ethanol isopropanol (IPA) and butanol (BuOH)
  • OPP represents a biaxially stretched polypropylene film.
  • the contact angles in Table 1 were carried out by changing the liquid used in various ways by the static drip method of JIS R 3257 “Wetting property test on the surface of the substrate glass”.
  • a contact angle meter "Drop Master” (trade name) manufactured by Kyowa Interface Science was used for the measurement.
  • the surface roughness was measured using "Surfcom TOUCH50" (trade name) manufactured by Tokyo Seimitsu Co., Ltd.
  • Adhesive A As the pressure-sensitive adhesive A used for the pressure-sensitive adhesive layer, 97 parts by mass of 2-ethylhexyl acrylate and 3 parts by mass of acrylic acid were polymerized in a solvent using 2,2'-azobis (isobutyronitrile) as an initiator, and the solid content was 50. % Acrylic polymer was obtained. As a base polymer, an acrylic pressure-sensitive adhesive A containing 100 parts by mass of this acrylic polymer and 1 part by mass of an isocyanate-based curing agent (manufactured by Soken Kagaku Co., Ltd., trade name L-45) was prepared.
  • an isocyanate-based curing agent manufactured by Soken Kagaku Co., Ltd., trade name L-45
  • Adhesive B As the pressure-sensitive adhesive B used for the pressure-sensitive adhesive layer, 100 parts by mass of natural rubber, 150 parts by mass of calsim carbonate, 100 parts by mass of a tackifier (Quinton (registered trademark) R100 manufactured by Nippon Zeon), and 30 parts by mass of process oil were kneaded. A rubber-based adhesive B was prepared.
  • Adhesive C As the pressure-sensitive adhesive C used for the bonding layer, 100 parts by mass of an addition-curable silicone pressure-sensitive adhesive stock solution (KR-3074 manufactured by Shin-Etsu Chemical Industry Co., Ltd.) having a solid content concentration of 60% by mass, 54 parts by mass of toluene as a diluting solvent, and 0 platinum catalyst as a curing catalyst. A silicone-based pressure-sensitive adhesive C containing .5 parts by mass was prepared.
  • an addition-curable silicone pressure-sensitive adhesive stock solution KR-3074 manufactured by Shin-Etsu Chemical Industry Co., Ltd.
  • Primer used for the primer layer 100 parts by mass of the main agent (KR-3006A manufactured by Shin-Etsu Chemical Co., Ltd.), 10 parts by mass of the auxiliary agent (KR-3006BT manufactured by Shin-Etsu Chemical Co., Ltd.), and the catalyst (CAT-PS manufactured by Shin-Etsu Chemical Co., Ltd.) -8S) was blended, and an undercoating agent was prepared by adding an appropriate amount of toluene.
  • the main agent KR-3006A manufactured by Shin-Etsu Chemical Co., Ltd.
  • auxiliary agent KR-3006BT manufactured by Shin-Etsu Chemical Co., Ltd.
  • the catalyst CAT-PS manufactured by Shin-Etsu Chemical Co., Ltd.
  • Release agent A A coating liquid having a solid content concentration of 0.5% by mass prepared using a fluorinated silicone release agent (SYL-OFF Q-7785 manufactured by Toray Dow Corning) is prepared as a release agent for forming the release-treated surface. did.
  • Example 1 A release agent A is applied to the other surface of a PET film (Toray Mirror (registered trademark) S-10 # 50) that has been preliminarily subjected to an easy-adhesion treatment at a coating amount of 5 g / m 2 and dried. A mold release surface was formed. Next, a masking sheet was prepared by applying the pressure-sensitive adhesive A to the easy-adhesion-treated surface by a roll coating method so as to have a thickness of 30 ⁇ m. The total thickness of the masking sheet was 0.08 mm.
  • Example 2 A masking sheet is prepared by applying the release agent A to the dried PET film in the same manner as in Example 1 and applying the pressure-sensitive adhesive B with a calendar roll to form a rubber-based pressure-sensitive adhesive layer having a thickness of 100 ⁇ m. did. The total thickness of the masking sheet was 0.15 mm.
  • Example 3 A masking sheet was prepared by applying the pressure-sensitive adhesive B to the other surface of a 180 ⁇ m-thick PTFE film (7991 manufactured by Valqua) in which one surface was previously subjected to an easy-adhesion treatment in the same manner as in Example 2. The total thickness of the masking sheet was 0.28 mm.
  • Adhesive B was applied to both sides of the complementary layer with a calendar roll to prepare an adhesive sheet having a total thickness of 0.5 mm. Further, as in Example 1, the release agent A is applied to one side of the PET film at a coating amount of 5 g / m 2 , the primer is applied to the other side by the gravure coating method, and then the adhesive C is applied with a roll coater. A base layer was prepared by forming a bonding layer having a thickness of about 80 ⁇ m. A masking sheet was produced by laminating and adhering the bonding layer of the base layer and the adhesive sheet. The total thickness of the masking sheet was 0.63 mm.
  • Example 5 An undercoating agent is applied to the easily adhesive-treated surface of the PTFE film as in Example 3 by a gravure coating method, and then the adhesive C is applied with a roll coater to form a bonding layer of about 80 ⁇ m.
  • a base layer A masking sheet was produced by laminating the bonding layer of the base layer with an adhesive sheet prepared in the same manner as in Example 4. The total thickness of the masking sheet was 0.76 mm.
  • Example 6 Similar to Example 1, the release agent B was applied to the surface of the PET film that had not been subjected to the easy-adhesion treatment, and then the surface was passed through an embossed roll to form irregularities on the surface.
  • the base layer was prepared by applying the undercoat layer and the pressure-sensitive adhesive C to the easy-adhesion-treated surface in the same manner as in Example 4 to form a bonding layer.
  • a masking sheet was produced by laminating and adhering the bonding layer of the base layer with an adhesive sheet prepared by the same method as in Example 4. The total thickness of the masking sheet was 0.66 mm.
  • the surface roughness of the outer surface of the base layer was 14.6 ⁇ m as shown in Table 1.
  • Example 7 A masking sheet was prepared in the same manner as in Example 6 except that the embossed roll was not passed through. The total thickness of the masking sheet was 0.65 mm.
  • Example 8 A masking sheet was prepared by laminating two adhesive sheets prepared by the same method as in Example 4 on the outer surface of the adhesive sheet of the masking sheet prepared by the same method as in Example 5. The total thickness of the masking sheet was 1.76 mm.
  • Example 9 A masking sheet was prepared by laminating eight adhesive sheets prepared by the same method as in Example 4 on the outer surface of the adhesive sheet of the masking sheet prepared by the same method as in Example 5. The total thickness of the masking sheet was 4.76 mm.
  • Example 1 Using the PET film used in Example 1, a masking sheet was prepared in the same manner as in Example 1 except that the release agent was not applied to the PET film. The total thickness of the masking sheet was 0.08 mm.
  • Comparative Example 2 A masking sheet was produced in the same manner as in Comparative Example 1 except that the PET film was changed to an OPP film (Toray's Trefan (registered trademark) # 30-2500H). The total thickness of the masking sheet was 0.09 mm.
  • Eposerm Resin XL-800A (trade name) manufactured by Mitsubishi Chemical Infratec Co., Ltd. is used as the resin composition, and the resin composition on the outer surface of the base layer is repellent (resin repellent) and peeled from the sticking surface based on the following criteria.
  • the results are shown in Table 2.
  • ⁇ The entire surface was repelled, and the resin composition adhered to 10% or less of the area of the outer surface of the base layer.
  • the masking sheet according to the present invention was able to repel the resin composition when the ethanol contact angle on the outer surface of the base layer was 30 ° or more. As a result, peeling was easy even after the resin composition had hardened. Further, by having an appropriate thickness, the handleability was also good. Further, the masking sheet (Example 6) in which the outer surface of the base layer has irregularities has higher resilience and handleability of the resin composition as compared with the one having a flat outer surface (Example 7). It was.
  • the masking sheets of Examples 1 to 3 have a thickness of about 0.2 mm, the workability of the peeling work after applying the resin composition is slightly inferior to that of the other examples. Met. Further, since the masking sheet of Example 9 has a thickness of 4.76 mm, it slightly interferes with the iron and rollers when the resin composition is applied, and in this respect, the workability is inferior. And peeling work could be done well.
  • the masking sheet according to the present invention repels the resin composition on the outer surface of the base layer, the peeling workability is good even if the coating is applied a plurality of times. Further, since the peeling work only needs to be performed once for a plurality of coatings, it also has an effect of reducing waste.

Abstract

In order to provide a marking masking sheet that does not require the masking sheet to be detached every time coating/impregnation is performed with a resin composition, this masking sheet is used in which at least a base layer and an adhesive sheet having an adhesive agent layer are integrally laminated. The adhesive agent layer is disposed on one end side of the outer surface of the masking sheet. The base layer is disposed on the other end side of the outer surface of the masking sheet. The contact angle of ethanol is not less than 30° on the outer surface of the base layer serving as the outer surface of the masking sheet.

Description

マスキングシート及びそれを用いた道路床版の補強方法Masking sheet and method of reinforcing road deck using it
　本発明は、樹脂組成物を塗布する際に使用するマスキングシートおよび該マスキングシートを用いた道路床版の補強方法に関する。 The present invention relates to a masking sheet used when applying a resin composition and a method for reinforcing a road deck using the masking sheet.
　建物の外壁や自動車の車体等の被塗装体に塗装を施す際には、被塗装体の塗料を付着させたくない箇所にマスキングシートを貼り、所望の箇所に塗料を塗布した後に該マスキングシートを剥離除去することにより、非塗装部への塗料の付着を防止している。マスキングシートの外表面、すなわちマスキングシートの被塗装体へ貼着する面とは反対の面には、被塗装体の塗装部と同様に塗料が付着する。通常、マスキングシートの外表面は、付着した塗料が垂れたり、塗装後の皮膜がマスキングシートから剥がれたりしない性状を有する。したがって、１回の塗装毎にマスキングシートの貼着と剥離を行うことが一般的である。 When painting an object to be painted such as the outer wall of a building or the car body of an automobile, a masking sheet is attached to a place where the paint of the object to be painted does not want to adhere, and after applying the paint to a desired part, the masking sheet is applied. By removing the peeling, the paint is prevented from adhering to the unpainted part. The paint adheres to the outer surface of the masking sheet, that is, the surface of the masking sheet opposite to the surface to be attached to the object to be coated, in the same manner as the painted portion of the object to be coated. Usually, the outer surface of the masking sheet has a property that the adhered paint does not drip and the film after painting does not peel off from the masking sheet. Therefore, it is common to attach and remove the masking sheet for each coating.
　ところで、従来、道路床版の補強方法として、強化繊維（炭素繊維やアラミド繊維等）と樹脂組成物（エポキシ樹脂等）から構成される連続繊維シートを床版下面に接着する方法が知られている。この場合、床版全面を連続繊維シートで覆うと、自動車が繰り返し走行する際に生じ得る床版のひび割れ等の不具合を施工後に観察できない。又、床版上面からの浸透水が床版下面におけるコンクリートと連続繊維シートとの間に滞留し、床版の寿命を低下させる等の問題があった。そこで、床版の下面に配置する連続シートを格子状に設置する方法が提案されている（特許文献１）。この方法によると、床版下面に連続繊維シートが被わない露出部が形成されるため、コンクリートのひび割れ等の状況を容易に観察することができ、かつ、当該露出部の存在により床版上面からの浸透水が床版下面におけるコンクリート部と連続繊維シートとの間に滞留することを防止することが可能となる。 By the way, conventionally, as a method for reinforcing a road deck, a method of adhering a continuous fiber sheet composed of reinforcing fibers (carbon fiber, aramid fiber, etc.) and a resin composition (epoxy resin, etc.) to the lower surface of the deck has been known. There is. In this case, if the entire surface of the deck is covered with a continuous fiber sheet, defects such as cracks in the deck that may occur when the automobile repeatedly travels cannot be observed after construction. Further, there is a problem that the permeated water from the upper surface of the deck stays between the concrete and the continuous fiber sheet on the lower surface of the deck, which shortens the life of the deck. Therefore, a method of arranging continuous sheets arranged on the lower surface of the deck in a grid pattern has been proposed (Patent Document 1). According to this method, since an exposed portion that is not covered by the continuous fiber sheet is formed on the lower surface of the deck, it is possible to easily observe the state of cracks in concrete, and the presence of the exposed portion makes it possible to easily observe the upper surface of the deck. It is possible to prevent the permeated water from staying between the concrete portion on the lower surface of the deck and the continuous fiber sheet.
　この連続繊維シートを設置する際、硬化性の樹脂組成物を連続繊維シートに含浸させ、繊維強化プラスチック（ＦＰＲ）材へと転換する方法が採用される。作業の効率上、格子状に設置する場合に、一方向に平行に複数の連続繊維シートを設置し、次いで直交する方向に複数の連続繊維シートを設置して、格子状の設置を行う。露出部となる部分には、強化繊維に樹脂を含浸させる前にマスキングテープを貼着しておき、一方向の設置が終了した段階でマスキングテープを貼り替えて、別方向の設置を実施する方法が一般的である。 When installing this continuous fiber sheet, a method of impregnating the continuous fiber sheet with a curable resin composition and converting it into a fiber reinforced plastic (FPR) material is adopted. In order to improve work efficiency, when installing in a grid pattern, a plurality of continuous fiber sheets are installed in parallel in one direction, and then a plurality of continuous fiber sheets are installed in orthogonal directions to perform the grid-like installation. A method in which masking tape is attached to the exposed part before impregnating the reinforcing fibers with resin, and when the installation in one direction is completed, the masking tape is replaced and the installation is carried out in the other direction. Is common.
　本出願人は、基材と粘着剤層とを含む四角形の単層マスキングシートを複数積層した多層マスキングシートであって、各単層マスキングシートが、マスキングシート基材の第１の辺と対向する第２の辺の外縁に沿って前記粘着剤層が設けられ、前記第１及び第２の辺と異なる第３の辺から対向する第４の辺に向かって略中央部に無粘着領域を設けたことを特徴とする隅出し用多層マスキングシートを提案している（特許文献２）。この隅出し用多層マスキングシートは、強化繊維を用いた道路床版補強において、強化繊維の帯を格子状に配置する際の非被覆部に配置され、強化繊維を硬化させる樹脂組成物の塗工に際し、樹脂組成物の床版への付着を抑制している。この多層マスキングシートは、樹脂組成物が塗工された後、上層の単層シートを順次剥離することで、多数回の樹脂組成物の塗工に１回の隅出しで対応することが可能となる。マスキングシートは、塗工毎に新たな基材が表に現れて、塗工された樹脂組成物と共に剥離される。 The applicant is a multi-layer masking sheet in which a plurality of square single-layer masking sheets including a base material and an adhesive layer are laminated, and each single-layer masking sheet faces the first side of the masking sheet base material. The adhesive layer is provided along the outer edge of the second side, and a non-adhesive region is provided in a substantially central portion from a third side different from the first and second sides toward a fourth side facing the first side. We have proposed a multi-layer masking sheet for cornering, which is characterized by the above (Patent Document 2). This multi-layer masking sheet for cornering is arranged in the non-covered portion when the bands of the reinforcing fibers are arranged in a grid pattern in the road deck reinforcement using the reinforcing fibers, and the coating of the resin composition for curing the reinforcing fibers is performed. At that time, the adhesion of the resin composition to the floor slab is suppressed. This multi-layer masking sheet can be applied to a large number of times with a single corner by sequentially peeling off the upper single-layer sheet after the resin composition is applied. Become. In the masking sheet, a new base material appears on the surface at each coating and is peeled off together with the coated resin composition.
特開２００５－２９９５３号公報Japanese Unexamined Patent Publication No. 2005-29953 特許第６４３１６４９号公報Japanese Patent No. 6431649
　このように、従来のマスキングシートでは、樹脂組成物を弾かない材料、例えば、紙、布、又は各種合成樹脂からなるフィルムや不織布などが基材として用いられていた。そのため、従来、樹脂組成物の最初の塗工と、次の塗工の間でマスキングテープの剥離を行う必要があった。 As described above, in the conventional masking sheet, a material that does not repel the resin composition, for example, paper, cloth, or a film or non-woven fabric made of various synthetic resins, is used as a base material. Therefore, conventionally, it has been necessary to peel off the masking tape between the first coating of the resin composition and the next coating.
　このように、道路床版の繊維補強時のマスキングにおいて、樹脂組成物を塗工・含浸する都度、マスキングシートを剥がす必要がなければ、作業工程をさらに簡略化することが可能となる。 In this way, in masking when reinforcing the fibers of the road deck, if it is not necessary to peel off the masking sheet each time the resin composition is applied or impregnated, the work process can be further simplified.
　したがって、本発明の目的は、樹脂組成物を塗工・含浸する都度、マスキングシートを剥がす必要がないマスキングシートを提供することにある。さらに本発明の目的は、該マスキングシートを用いた床版の補強方法を提供することを課題とする。 Therefore, an object of the present invention is to provide a masking sheet that does not require the masking sheet to be peeled off each time the resin composition is applied or impregnated. A further object of the present invention is to provide a method for reinforcing a floor slab using the masking sheet.
　本発明は、従来の発想とは逆に、塗料付着性が悪い基層を粘着シートに積層することにより、マスキング及び剥離の回数が１回で済むマスキングシートを提供する。
　本発明では、少なくとも、基層と、粘着剤層を有する粘着シートとが積層一体化されたマスキングシートであって、前記マスキングシートの表面の一端側には前記粘着剤層が配置され、前記マスキングシートの表面の他端側には前記基層が配置され、前記マスキングシートの外表面にあたる前記基層の外表面は、エタノールの接触角が３０°以上の面である、マスキングシートが提供される。 Contrary to the conventional idea, the present invention provides a masking sheet in which the number of masking and peeling is only one by laminating a base layer having poor paint adhesion on the adhesive sheet.
In the present invention, at least a masking sheet in which a base layer and an adhesive sheet having an adhesive layer are laminated and integrated, and the adhesive layer is arranged on one end side of the surface of the masking sheet, and the masking sheet is provided. A masking sheet is provided in which the base layer is arranged on the other end side of the surface of the masking sheet, and the outer surface of the base layer corresponding to the outer surface of the masking sheet is a surface having an ethanol contact angle of 30 ° or more.
　また、本発明では、道路床版の下面に、少なくとも帯状の強化繊維を第１の方向に所定の間隔を開けて設置して樹脂含浸し、さらに、前記帯状の強化繊維を前記第１の方向と直交する第２の方向に所定の間隔を開けて設置して樹脂含浸し、格子状の繊維強化樹脂構造体を形成して補強する道路床版の補強方法において、上記のマスキングシートを前記格子状の繊維強化樹脂構造体の非被覆部に配置する工程を含む道路床版の補強方法が提供される。 Further, in the present invention, at least strip-shaped reinforcing fibers are installed on the lower surface of the road deck at predetermined intervals in the first direction and impregnated with resin, and further, the strip-shaped reinforcing fibers are impregnated in the first direction. In a method for reinforcing a road deck, which is installed at a predetermined interval in a second direction orthogonal to and impregnated with resin to form and reinforce a lattice-shaped fiber reinforced resin structure, the above masking sheet is applied to the lattice. A method for reinforcing a road deck is provided, which comprises a step of arranging the shape of the fiber reinforced resin structure in an uncoated portion.
　本発明のマスキングシートは、樹脂組成物を塗工・含浸する際、その外表面で樹脂組成物を弾くことができ、複数回の剥離を行うことなく次の樹脂組成物の塗工・含浸を行うことができる。この結果、道路床版の補強工法などでマスキング及び剥離を一回で済ませることができ、作業性が向上する。 When the resin composition is coated / impregnated, the masking sheet of the present invention can repel the resin composition on the outer surface thereof, and the next resin composition can be coated / impregnated without peeling a plurality of times. It can be carried out. As a result, masking and peeling can be completed only once by a road deck reinforcement method or the like, and workability is improved.
本発明のマスキングシートの積層構造を説明する概略断面図である。It is schematic cross-sectional view explaining the laminated structure of the masking sheet of this invention. 道路床版の補強方法を示す床版下面側の斜視模式図である。It is a perspective schematic view of the underside of the deck which shows the reinforcement method of a road deck. マスキングシートの配置例を示す平面模式図である。It is a plane schematic diagram which shows the arrangement example of the masking sheet. 道路床版の補強方法を工程順に示す断面模式図である。It is sectional drawing which shows the reinforcement method of a road deck in the order of a process.
　従来、塗装用のマスキングでは、マスキングシート（テープ）が塗料を弾くことは、塗装面の平滑性を損なう懸念があり、採用できない構成であった。そのため、強化繊維補強など、樹脂組成物の塗工面の平滑性が然程要求されない場合にも、従来の塗装用のマスキングシートが採用されていた。また、マスキングシートは塗工後に剥離する必要があることから、容易に剥離できることが重要であるが、従来のマスキングシートでは、１回の塗工毎に、樹脂組成物が硬化する前に剥離しておかないと、樹脂組成物の硬化後の剥離が困難になる。このような従来の常識的な発想から転換し、強化繊維に塗工・含浸される樹脂組成物を弾く材料を本発明のマスキングシートの基層の外表面に採用することにより、複数回の樹脂組成物の塗工・含浸に曝されても剥離が容易に行えるという知見を得た。 Conventionally, in masking for painting, the masking sheet (tape) repelling the paint may impair the smoothness of the painted surface, so it has not been adopted. Therefore, a conventional masking sheet for painting has been adopted even when the smoothness of the coated surface of the resin composition is not so required, such as reinforcement of reinforcing fibers. Further, since the masking sheet needs to be peeled off after coating, it is important that the masking sheet can be easily peeled off. However, in the conventional masking sheet, each coating is peeled off before the resin composition is cured. Otherwise, it will be difficult to peel off the resin composition after curing. By changing from such a conventional conventional idea and adopting a material that repels the resin composition coated / impregnated in the reinforcing fiber for the outer surface of the base layer of the masking sheet of the present invention, the resin composition is formed a plurality of times. We have obtained the finding that peeling can be easily performed even when exposed to coating and impregnation of objects.
　本発明では、上記構成を有するマスキングシートを採用することにより、マスキング及び剥離の回数を一回で済ませることができ、作業性が向上する。 In the present invention, by adopting the masking sheet having the above structure, the number of masking and peeling can be performed only once, and the workability is improved.
　（構成）
　本発明のマスキングシートは、少なくとも、基層と、粘着剤層を有する粘着シートとが積層されたマスキングシートであって、前記マスキングシートの表面の一端側には前記粘着剤層が配置され、前記マスキングシートの表面の他端側には前記基層が配置され、前記マスキングシートの外表面にあたる前記基層の外表面は、エタノールの接触角が３０°以上の面である、マスキングシートである。コンクリート床版などマスキング対象となる貼着面に粘着剤層を貼着し、マスキングシートの外表面の、粘着剤層の反対側となる面に基層が面する。ここで、「エタノールの接触角が３０°以上」であるとは、エタノールの、対象となる面に対する接触角が３０°以上であることを意味する。以下、「エタノール接触角」という。また、「前記マスキングシートの外表面にあたる前記基層の外表面」を「基層の外表面」、あるいは単に「外表面」ということがある。 (Constitution)
The masking sheet of the present invention is a masking sheet in which at least a base layer and an adhesive sheet having an adhesive layer are laminated, and the adhesive layer is arranged on one end side of the surface of the masking sheet, and the masking is performed. The base layer is arranged on the other end side of the surface of the sheet, and the outer surface of the base layer corresponding to the outer surface of the masking sheet is a masking sheet having an ethanol contact angle of 30 ° or more. The adhesive layer is attached to the adhesive surface to be masked, such as a concrete deck, and the base layer faces the surface of the outer surface of the masking sheet opposite to the adhesive layer. Here, "the contact angle of ethanol is 30 ° or more" means that the contact angle of ethanol with respect to the target surface is 30 ° or more. Hereinafter, it is referred to as "ethanol contact angle". Further, the "outer surface of the base layer corresponding to the outer surface of the masking sheet" may be referred to as the "outer surface of the base layer" or simply the "outer surface".
　（基層）
　本発明のマスキングシートに使用する基層は、被貼着面に貼着した後、露出する面（外表面）が、エタノール接触角が３０°以上であればよい。このような性質を実現可能な材料としては、シリコーン樹脂、シリコーンゴム、フッ素系樹脂、フッ素系ゴム、フッ素化シリコーン樹脂、フッ素化シリコーン系ゴムなどがある。これら材料のフィルムを基層として用いてもよい。また、ポリエチレン（ＰＥ）フィルムやポリエチレンテレフタレート（ＰＥＴ）フィルム、ポリプロピレン（ＰＰ）フィルムなど公知のフィルム材の外表面にフッ素系樹脂やシリコーン系樹脂やシリコーン系ゴム等を用いて離型処理を施すことで、マスキングシートの外表面を、３０°以上のエタノール接触角とすることもできる。 (Base layer)
The base layer used for the masking sheet of the present invention may have an ethanol contact angle of 30 ° or more on the exposed surface (outer surface) after being attached to the surface to be attached. Examples of materials capable of realizing such properties include silicone resin, silicone rubber, fluorine-based resin, fluorine-based rubber, fluorinated silicone resin, and fluorinated silicone-based rubber. A film of these materials may be used as a base layer. Further, the outer surface of a known film material such as a polyethylene (PE) film, a polyethylene terephthalate (PET) film, or a polypropylene (PP) film is subjected to a mold release treatment using a fluorine-based resin, a silicone-based resin, a silicone-based rubber, or the like. Therefore, the outer surface of the masking sheet can have an ethanol contact angle of 30 ° or more.
　尚、本発明で規定するエタノール接触角は、ＪＩＳ　Ｒ　３２５７の「基板ガラス表面のぬれ性試験方法」における静滴法により測定されたものである。 The ethanol contact angle specified in the present invention was measured by the static drip method in the "wetting property test method for the surface of the substrate glass" of JIS R 3257.
　このように、エタノール接触角が３０°以上であれば、当該外表面は、付着した樹脂組成物を弾くことができ、複数回の樹脂組成物の塗工後にも、当該外表面に厚い樹脂組成物の皮膜が形成されることがなく、容易に剥離することができる。接触角はより高いほど樹脂組成物の弾き性が良好となり、好ましくは該接触角が３２°以上、より好ましくは３５°以上である。 As described above, when the ethanol contact angle is 30 ° or more, the outer surface can repel the adhered resin composition, and even after a plurality of coatings of the resin composition, the outer surface has a thick resin composition. The film of the object is not formed and can be easily peeled off. The higher the contact angle, the better the resilience of the resin composition, and the contact angle is preferably 32 ° or more, more preferably 35 ° or more.
　また、基層の外表面は、エンボス加工を行って凹凸を設けるなどの粗面化を行ってもよい。これにより、基層の外表面をよりエタノール接触角の高い状態とすることができる。
粗面化された基層の外表面の表面粗さ（算術平均粗さＲａ）は、３μｍ以上、３０μｍ以下であることが好ましい。この範囲であれば、粗面化した効果を得ることができ、また、凹部に樹脂組成物が残留しにくくなる。 Further, the outer surface of the base layer may be roughened by embossing to provide unevenness. As a result, the outer surface of the base layer can be brought into a state where the ethanol contact angle is higher.
The surface roughness (arithmetic mean roughness Ra) of the outer surface of the roughened base layer is preferably 3 μm or more and 30 μm or less. Within this range, the roughening effect can be obtained, and the resin composition is less likely to remain in the recesses.
　本発明の基層あるいは基層の外表面を構成する樹脂の例について説明する。フッ素系樹脂又はフッ素系ゴムの種類は特に限定されないが、ポリテトラフルオロエチレン（ＰＴＦＥ）、テトラフルオロエチレン－パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ）、ポリクロロトリフルオロエチレン（ＰＣＴＦＥ）、テトラフルオロエチレン－ヘキサフルオロプロピレン共重合体（ＦＥＰ）、テトラフルオロエチレン－エチレン共重合体（ＰＥＴＦＥ）、ポリフッ化ビニリデン（ＰＶｄＦ）、フッ化ビニリデン－ヘキサフルオロプロピレン－テトラフルオロエチレン共重合体、フッ化ビニリデン－テトラフルオロエチレン共重合体、エチレン－テトラフルオロエチレン共重合体等の含フッ素ゴム等を用いることができる。なかでも、ポリテトラフルオロエチレン（ＰＴＦＥ）、テトラフルオロエチレン－パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ）、テトラフルオロエチレン－ヘキサフルオロプロピレン共重合体（ＦＥＰ）が好ましい。これらの材料は、耐薬品性に優れることから、様々な樹脂組成物の付着に対して弾き性を発現する。これらの原料であるフッ素系樹脂又はフッ素系ゴムは一種単独で用いても構わないし、二種以上を混合したものでも、それらを積層したものでも構わない。また、他の材料との複合材であってもよい。 An example of the base layer of the present invention or the resin constituting the outer surface of the base layer will be described. The type of fluororesin or fluororubber is not particularly limited, but is polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene. -Hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (PETFE), polyvinylidene fluoride (PVdF), vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, vinylidene fluoride-tetra Fluororesin-containing rubber such as a fluoroethylene copolymer and an ethylene-tetrafluoroethylene copolymer can be used. Of these, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP) are preferable. Since these materials have excellent chemical resistance, they exhibit resilience to the adhesion of various resin compositions. The fluorinated resin or fluorinated rubber as these raw materials may be used alone, or may be a mixture of two or more, or a laminated product thereof. Further, it may be a composite material with another material.
　シリコーン系樹脂又はシリコーン系ゴムの種類は特に限定されないが、過酸化物硬化型シリコーンゴム、付加反応型シリコーンゴム、縮合反応型シリコーンゴム等のＤ単位［(CH3)2SiO］からなる構造を有するポリジメチルシロキサンの長鎖の重合体に必要に応じて官能基を導入したものが挙げられる。また、過酸化物硬化型シリコーン樹脂、付加反応型シリコーン樹脂、縮合反応型リコーン樹脂等のＭ単位（Ｒ3ＳｉＯ1/2）、Ｑ単位（ＳｉＯ2）、Ｔ単位（ＲＳｉＯ3/2）およびＤ単位（Ｒ2ＳｉＯ）から選ばれる少なくとも１種の単位を有するオルガノポリシロキサンが挙げられる。これらの原料となる樹脂又はゴムは一種単独で用いても構わないし、二種以上を混合したものでも、それらを積層したものでもよい。また、他の材料との複合材であってもよい。 The type of silicone resin or silicone rubber is not particularly limited, peroxide curing type silicone rubber, addition reaction type silicone rubber, a structure consisting of D units, such as condensation reaction type silicone rubber [(CH 3) 2 SiO] Examples thereof include those in which a functional group is introduced into a long-chain polymer of a polydimethylsiloxane having, if necessary. In addition, M unit (R 3 SiO 1/2 ), Q unit (SiO 2 ), T unit (RSiO 3/2 ) and T unit (RSiO 3/2) of peroxide-curable silicone resin, addition reaction type silicone resin, condensation reaction type silicone resin, etc. Includes organopolysiloxanes having at least one unit selected from D units (R 2 SiO). The resin or rubber used as these raw materials may be used alone, or may be a mixture of two or more, or a laminated product thereof. Further, it may be a composite material with another material.
　シリコーン系ゴムの原料としては、例えば、信越化学工業（株）製のＫＥ－１９５０－１０（Ａ／Ｂ）、ＫＥ－１９５０－２０（Ａ／Ｂ）、ＫＥ－１９５０－３０（Ａ／Ｂ）、ＫＥ－１９８７（Ａ／Ｂ）、ＫＥ－１９８８（Ａ／Ｂ）、旭化成ワッカーシリコーン（株）製のＬＲ７６６５シリーズ、ＬＲ３０３３シリーズ、モメンティブ（株）製のＴＳＥ３０３２シリーズ等を用いることができる。 Examples of raw materials for silicone-based rubber include KE-1950-10 (A / B), KE-1950-20 (A / B), and KE-1950-30 (A / B) manufactured by Shin-Etsu Chemical Co., Ltd. , KE-1987 (A / B), KE-1988 (A / B), LR7665 series manufactured by Asahi Kasei Wacker Silicone Co., Ltd., LR3033 series, TSE3032 series manufactured by Momentive Co., Ltd. and the like can be used.
　フッ素化シリコーン系離型剤は、例えば、パーフロロアルキル基や、パーフロロポリエーテル基等のフッ素置換基を主鎖に持つ変性シリコーンが挙げられる。これらは、通常、アルケニル基やヒドロシリル基など、反応（硬化）することによって架橋構造を形成し得る官能基が結合されている。 Examples of the fluorinated silicone-based release agent include modified silicone having a fluorine substituent such as a perfluoroalkyl group or a perfluoropolyether group in the main chain. These are usually bonded with functional groups such as alkenyl groups and hydrosilyl groups that can form a crosslinked structure by reaction (curing).
　フッ素化シリコーン系離型剤としては、具体的には信越化学工業（株）製のＸ－７０－２０１、Ｘ－７０－２５８、ＫＰ－９１１、東レ・ダウコーニング（株）製のＦＳ１２６５－３００ＣＳ、ＦＳ１２６５－１０００ＣＳ、ＦＳ１２６５－１００００ＣＳ、ＢＹ２４－９００、ＢＹ２４－９０３、ＳＹＬ－ＯＦＦ Ｑ－７７８５、ＳＹＬ－ＯＦＦ Ｑ－７７９５、ＳＹＬ－ＯＦＦ Ｑ－７７５５などが挙げられる。 Specific examples of the fluorinated silicone-based release agent include X-70-201, X-70-258, KP-911 manufactured by Shin-Etsu Chemical Co., Ltd., and FS1265-300CS manufactured by Toray Dow Corning Co., Ltd. , FS1265-1000CS, FS1265-10000CS, BY24-900, BY24-903, SYL-OFF Q-7785, SYL-OFF Q-7795, SYL-OFF Q-7755 and the like.
　（粘着剤層）
　粘着剤層としては、特に制限はなく、従来公知の粘着剤、例えば、ゴム系粘着剤、アクリル系粘着剤、エポキシ系粘着剤、ウレタン系粘着剤、シリコーン系粘着剤、ビニルエステル系粘着剤、ポリエステル系粘着剤、ポリマーセメント系粘着剤、およびポリオレフィン系粘着剤からなる群の中から選ばれる１種又は２種以上の粘着剤から選択することもできる。粘着剤層の厚みは例えば５μｍ～５００μｍであり、貼着面の粗度や曲率、マスキングシートを剥離する際の作業性などに応じて設定することができる。 (Adhesive layer)
The pressure-sensitive adhesive layer is not particularly limited, and conventionally known pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, acrylic-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and vinyl ester-based pressure-sensitive adhesives. It is also possible to select from one or more kinds of pressure-sensitive adhesives selected from the group consisting of polyester-based pressure-sensitive adhesives, polymer cement-based pressure-sensitive adhesives, and polyolefin-based pressure-sensitive adhesives. The thickness of the pressure-sensitive adhesive layer is, for example, 5 μm to 500 μm, and can be set according to the roughness and curvature of the adhesive surface, workability when peeling the masking sheet, and the like.
　（粘着シート）
　粘着シートは、粘着剤層を有し、基層と積層されるものである。粘着シートは粘着剤層のみで構成される場合や、一又は二以上他の層（以下、「補層」という）と粘着剤層を積層一体化して構成する場合がある。 (Adhesive sheet)
The pressure-sensitive adhesive sheet has a pressure-sensitive adhesive layer and is laminated with a base layer. The pressure-sensitive adhesive sheet may be composed of only the pressure-sensitive adhesive layer, or may be formed by laminating and integrating one or two or more other layers (hereinafter, referred to as “complementary layer”) and the pressure-sensitive adhesive layer.
　前記補層には、ポリエチレン（ＰＥ）フィルムやポリエチレンテレフタレート（ＰＥＴ）フィルム、ポリプロピレン（ＰＰ）フィルムなどの樹脂フィルム、繊維糸を含む織布や編布などの従来公知の材料が使用できる。又、粘着剤層には、マスキングシートが使用される直前まで剥離紙などの保護シート（剥離ライナーとも言う）で粘着面が保護されてもよい。 For the complementary layer, a conventionally known material such as a resin film such as a polyethylene (PE) film, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a woven fabric containing a fiber thread, or a knitted fabric can be used. Further, the adhesive surface may be protected by a protective sheet (also referred to as a release liner) such as a release paper until just before the masking sheet is used.
　図１に、本発明に係るマスキングシート５の例となる概略断面図を示す。図１（ａ）は、基層１が基材２により構成され、粘着シート３である粘着剤層４と積層して一体化したマスキングシート５をあらわす。この場合の基材２はＰＴＦＥなどにより構成され、その外表面１’は、エタノール接触角が３０°以上に保たれている。図１（ｂ）の構成では、基層１の基材２がＰＥＴなどにより構成され、その外表面１’に、エタノール接触角を３０°以上とするためシリコーン系樹脂等が塗布されて離型処理面６とされており、基層１が粘着シート３と積層一体化されている。図１（ｃ）は、マスキングシート５の厚みを増加させて貼着や剥離の際の作業性を向上させるため、粘着剤層４の基材２側に補層７を配置している。更に、補層７と基材２の接合性を向上させるため、基層１の補層７との接触面に接合層８を配置した構成である。図１（ｄ）は、図１（ｃ）の構成から更に厚みを増加させることを目的として、補層７と接合層８の間にも粘着剤層４を配置している。又、基層１の粘着シート３と接合する面には、基材２の粘着シート３側の面に下塗層９を設けた後、下塗層９の表面に接合層８を設けており、この接合層８と粘着シート３を積層して一体化している。図１（ｅ）は、図１（ｄ）の構成において外表面１’に図１（ａ）と同様の基材２を配置している構成である。 FIG. 1 shows a schematic cross-sectional view as an example of the masking sheet 5 according to the present invention. FIG. 1A shows a masking sheet 5 in which a base layer 1 is composed of a base material 2 and is laminated and integrated with an adhesive layer 4 which is an adhesive sheet 3. In this case, the base material 2 is made of PTFE or the like, and the outer surface 1'is maintained at an ethanol contact angle of 30 ° or more. In the configuration of FIG. 1B, the base material 2 of the base layer 1 is made of PET or the like, and a silicone resin or the like is applied to the outer surface 1'to make the ethanol contact angle 30 ° or more, and the mold is released. The surface 6 is formed, and the base layer 1 is laminated and integrated with the adhesive sheet 3. In FIG. 1 (c), the auxiliary layer 7 is arranged on the base material 2 side of the pressure-sensitive adhesive layer 4 in order to increase the thickness of the masking sheet 5 and improve the workability at the time of sticking and peeling. Further, in order to improve the bondability between the complementary layer 7 and the base material 2, the bonding layer 8 is arranged on the contact surface of the base layer 1 with the complementary layer 7. In FIG. 1D, the pressure-sensitive adhesive layer 4 is also arranged between the complementary layer 7 and the bonding layer 8 for the purpose of further increasing the thickness from the configuration of FIG. 1C. Further, on the surface of the base layer 1 to be bonded to the adhesive sheet 3, the undercoat layer 9 is provided on the surface of the base material 2 on the adhesive sheet 3 side, and then the bonding layer 8 is provided on the surface of the undercoat layer 9. The bonding layer 8 and the adhesive sheet 3 are laminated and integrated. FIG. 1 (e) is a configuration in which the same base material 2 as in FIG. 1 (a) is arranged on the outer surface 1'in the configuration of FIG. 1 (d).
　図１（ａ）～図１（ｅ）いずれの場合も、粘着剤層４の外表面４’は、使用する前まで保護シート（不図示）等で保護しておくことができる。このような保護シート（剥離ライナー）を含む構成も本発明の範囲である。なお、保護シートは剥離しやすくするため、粘着剤層４から一部はみ出すようにしておくことが好ましい。また、基層１を粘着シート３よりも大きくしてもよく、粘着シート３の側面の一部または全部を基層１で覆っていてもよい。粘着シート３の側面への樹脂組成物の付着を減らすことで、剥離工程での作業性を向上させることができる。 In any of FIGS. 1 (a) to 1 (e), the outer surface 4'of the pressure-sensitive adhesive layer 4 can be protected by a protective sheet (not shown) or the like before use. A configuration including such a protective sheet (release liner) is also within the scope of the present invention. In addition, in order to make the protective sheet easy to peel off, it is preferable that a part of the protective sheet protrudes from the adhesive layer 4. Further, the base layer 1 may be larger than the pressure-sensitive adhesive sheet 3, and a part or all of the side surfaces of the pressure-sensitive adhesive sheet 3 may be covered with the base layer 1. By reducing the adhesion of the resin composition to the side surface of the pressure-sensitive adhesive sheet 3, workability in the peeling step can be improved.
　マスキングシートの大きさは、マスキングする領域に合わせた大きさであれば良く、特に制限されない。長尺のマスキングシートを巻芯に巻き付けたロール状に構成してもよく、被貼着面の形状にあわせて、例えば、１００ｍｍ×１００ｍｍの四角形などに規格化しておいてもよい。また、道路床版のマスキングに用いる場合、通常は連続繊維シート同士を直交させることにより床版を補強するためマスキングシートの形状は正方形などの矩形となるが、例えば、床版上の曲面箇所等連続繊維シート同士を斜交させる場合には、平行四辺形（菱形を含む）、台形等の形状とすることもできる。 The size of the masking sheet may be any size that matches the area to be masked, and is not particularly limited. A long masking sheet may be wound around the core in a roll shape, or may be standardized into, for example, a quadrangle of 100 mm × 100 mm according to the shape of the surface to be attached. Further, when used for masking a road deck, the shape of the masking sheet is usually a rectangle such as a square because the continuous fiber sheets are orthogonal to each other to reinforce the deck. When the continuous fiber sheets are obliquely crossed with each other, the shape may be a parallelogram (including a rhombus), a trapezium, or the like.
　マスキングシートの厚さは、道路床版のマスキングに用いる場合、敷設する強化繊維材料の厚みに応じた厚さであることが好ましく、例えば、前記保護シートを除いた厚み（基層及び粘着シートを積層一体化した後の総厚み）が０．２ｍｍ以上、５．０ｍｍ以下であることが好ましい。更に好ましくは０．４ｍｍ以上、２．０ｍｍ以下の厚みである。マスキングシートの厚みが０．２ｍｍ未満であると、マスキングシートが強化繊維材料に埋もれ、剥離が困難となる場合がある。又、マスキングシートの厚みが５．０ｍｍよりも大きい場合、樹脂組成物を強化繊維に含浸させる際に用いる鏝（コテ）やローラーがマスキングシートに干渉して作業性が悪化する場合がある。 When used for masking a road deck, the thickness of the masking sheet is preferably a thickness corresponding to the thickness of the reinforcing fiber material to be laid. For example, the thickness excluding the protective sheet (base layer and adhesive sheet are laminated). The total thickness after integration) is preferably 0.2 mm or more and 5.0 mm or less. More preferably, the thickness is 0.4 mm or more and 2.0 mm or less. If the thickness of the masking sheet is less than 0.2 mm, the masking sheet may be buried in the reinforcing fiber material, making it difficult to peel it off. Further, when the thickness of the masking sheet is larger than 5.0 mm, the trowel or roller used for impregnating the reinforcing fibers with the resin composition may interfere with the masking sheet and the workability may be deteriorated.
　マスキングシートの製造方法は特に限定されないが、ロールコート、ダイコート、カレンダーコート、リバースコート、グラビアコート、ナイフコート等の方法により基層上に連続して粘着シートを塗工することができる。又、公知の方法により基層と粘着シートをそれぞれ作製した後、基層と粘着シートを貼り合わせることもできる。又、粘着シートの基層側に、基層の原料となるペレットを溶融成型することにより、基層をラミネート状に形成してもよい。 The manufacturing method of the masking sheet is not particularly limited, but the adhesive sheet can be continuously applied on the base layer by a method such as roll coating, die coating, calendar coating, reverse coating, gravure coating, knife coating and the like. It is also possible to prepare the base layer and the pressure-sensitive adhesive sheet by a known method, and then bond the base layer and the pressure-sensitive adhesive sheet together. Further, the base layer may be formed in a laminated shape by melt-molding pellets as a raw material of the base layer on the base layer side of the pressure-sensitive adhesive sheet.
　離型処理面は、前記のフッ素化シリコーンやシリコーン系樹脂などを基材に塗布することにより構成することができる。又、接合層は、シリコーン系粘着剤などを使用し、下塗層には、市販のシリコーン系プライマーを選択できる。 The release-treated surface can be formed by applying the above-mentioned fluorinated silicone, silicone-based resin, or the like to the base material. Further, a silicone-based adhesive or the like is used for the bonding layer, and a commercially available silicone-based primer can be selected for the undercoat layer.
　図２は、本発明の一実施態様に係る方法により補強した道路床版の下面側を示している。図２に示すように、道路床版２１の下面に、補強繊維シート２２を格子状に配置し、それに樹脂組成物を含浸して補強繊維シート２２の格子構造体を構成するとともに接着する。２３は連続繊維シートが被わない露出部となる。このような格子構造体を形成するため、図３に示すように、露出部２３となる領域に本発明に係るマスキングシート３１を貼着してマスキングを行う。マスキングを行った後、道路床版の下面に、帯状の強化繊維３２を第１の方向に所定の間隔を開けて設置して樹脂含浸し、さらに、別の帯状の強化繊維３３を前記第１の方向と直交する第２の方向に所定の間隔を開けて設置して樹脂含浸し、格子状の繊維強化樹脂構造体を形成して補強する。 FIG. 2 shows the lower surface side of the road deck reinforced by the method according to one embodiment of the present invention. As shown in FIG. 2, the reinforcing fiber sheet 22 is arranged in a grid pattern on the lower surface of the road deck 21, and the reinforcing fiber sheet 22 is impregnated with the resin composition to form a lattice structure of the reinforcing fiber sheet 22 and adhered to the lattice structure. Reference numeral 23 denotes an exposed portion that is not covered by the continuous fiber sheet. In order to form such a lattice structure, as shown in FIG. 3, the masking sheet 31 according to the present invention is attached to the exposed portion 23 to perform masking. After masking, strip-shaped reinforcing fibers 32 are installed on the lower surface of the road deck at predetermined intervals in the first direction to impregnate the resin, and another strip-shaped reinforcing fiber 33 is added to the first strip-shaped reinforcing fibers 33. It is installed at a predetermined interval in the second direction orthogonal to the direction of the above, impregnated with resin, and a grid-like fiber reinforced resin structure is formed and reinforced.
　図４は、本発明にかかるマスキングシートを用いた床版の補強工程を説明する図であり、図３のＡ－Ａ線に相当する断面図を示す。図４に示すように、従来の工程と同様、床版下面のケレン（下地処理）を行う。その後、施工範囲の割付、墨出しを行い、図２の露出部２３となる領域に本発明のマスキングシートを貼着してマスキングを行う（図４（ａ））。この状態で、プライマー４２の塗布、不陸処理、墨出しなどの前処理を行い（図４（ｂ））、樹脂組成物４３の下塗り、１層目の強化繊維３２の貼り付け（図３の左右方向（「第１の方向」ともいう）に延在した貼り付け）、樹脂組成物４３の上塗り、樹脂組成物４３の強化繊維への含浸などを行う（図４（ｃ））。 FIG. 4 is a diagram illustrating a floor slab reinforcing step using the masking sheet according to the present invention, and shows a cross-sectional view corresponding to line AA of FIG. As shown in FIG. 4, the underside of the floor slab is cleaned (base treatment) in the same manner as in the conventional process. After that, the construction range is assigned and marked out, and the masking sheet of the present invention is attached to the exposed portion 23 in FIG. 2 for masking (FIG. 4 (a)). In this state, pretreatment such as coating of primer 42, non-landing treatment, and marking out is performed (FIG. 4 (b)), and the undercoat of the resin composition 43 and the first layer of reinforcing fibers 32 are attached (FIG. 3). Pasting extending in the left-right direction (also referred to as "first direction"), top coating of the resin composition 43, impregnation of the reinforcing fibers of the resin composition 43, and the like are performed (FIG. 4 (c)).
　さらに、２層目を形成するための墨出しを行った後、樹脂組成物４４の下塗り、２層目強化繊維３３の貼り付け（図３の上下方向（「第２の方向」ともいう）に延在した貼り付け）、樹脂組成物４４の上塗り、含浸を行う（図４（ｄ））。 Further, after marking out to form the second layer, the undercoat of the resin composition 44 and the second layer reinforcing fiber 33 are attached (in the vertical direction (also referred to as “second direction”) in FIG. (Extended pasting), topcoating and impregnation of the resin composition 44 (FIG. 4 (d)).
　これらの塗工に際し、マスキングシート５の外表面１’にプライマー４２や樹脂組成物４３、４４が付着しても、外表面１’の全体に樹脂組成物が展開して付着することなく、図４（ｃ）や図４（ｄ）に示すように水玉状（４３Ｄ、４４Ｄ）に付着することから、マスキングシート５が樹脂組成物に埋もれることがなく、剥離作業を良好に行うことができる。又、基層１が図１（ａ）や図１（ｅ）のような構成である場合、樹脂組成物をはじく層が一定の厚みを有するため、基層１の側面でも樹脂組成物４４がはじかれており（図４（ｄ）のＲ部）、剥離作業がより容易となる。 In these coatings, even if the primer 42 or the resin compositions 43 and 44 adhere to the outer surface 1'of the masking sheet 5, the resin composition does not develop and adhere to the entire outer surface 1'. Since it adheres to the polka dots (43D, 44D) as shown in 4 (c) and 4 (d), the masking sheet 5 is not buried in the resin composition, and the peeling operation can be performed satisfactorily. Further, when the base layer 1 has the configuration shown in FIGS. 1A and 1E, the layer that repels the resin composition has a certain thickness, so that the resin composition 44 is also repelled on the side surface of the base layer 1. (R part in FIG. 4D), which makes the peeling work easier.
　その後、マスキングシート３１を除去し、養生する。これにより樹脂マトリックス中に強化繊維が配された格子状の繊維強化樹脂構造体（ＦＲＰ）が形成され、道路床版の下面の補強が可能となる。また、本発明に係るマスキングシートを除去した非被覆部は、床版下面のコンクリート面が露出しており、経時的なひび割れ等の観察が可能となり、浸透水の滞留を防止できる。このように、本発明では２層の強化繊維貼り付けに際して、１回のマスキングを行うのみでよいため、マスキングを強化繊維の貼り付け毎に行う場合に比してマスキングの正確性が格段に向上する。また、マスキングシートの剥離工程も１回でよいため、作業性が向上する。特に本発明のような道路床版の補強工法では、基層の側面から上面にかけて樹脂組成物を弾くことで、樹脂組成物が基層の外表面に広がることが防止できる。 After that, the masking sheet 31 is removed and cured. As a result, a grid-like fiber reinforced plastic structure (FRP) in which reinforcing fibers are arranged in the resin matrix is formed, and the lower surface of the road deck can be reinforced. Further, in the uncoated portion from which the masking sheet according to the present invention has been removed, the concrete surface on the lower surface of the floor slab is exposed, so that cracks and the like can be observed over time, and the retention of permeated water can be prevented. As described above, in the present invention, when the two layers of the reinforcing fibers are attached, only one masking is required, so that the masking accuracy is remarkably improved as compared with the case where the masking is performed every time the reinforcing fibers are attached. To do. Further, since the masking sheet peeling step may be performed only once, the workability is improved. In particular, in the road deck reinforcement method as in the present invention, the resin composition can be prevented from spreading to the outer surface of the base layer by flipping the resin composition from the side surface to the upper surface of the base layer.
　さらに、基層の側面でも樹脂組成物を弾くことで、マスキングシートの剥離に際して、コテ等の治具をマスキングシートの側面に沿って差し込み易く、より剥離が容易となる。
強化繊維を用いた床板補強方法のその他の詳細については、特許文献１等の記載を参考にできる。 Further, by flipping the resin composition on the side surface of the base layer as well, when the masking sheet is peeled off, a jig such as a trowel can be easily inserted along the side surface of the masking sheet, which makes the peeling easier.
For other details of the floor plate reinforcing method using reinforcing fibers, the description of Patent Document 1 and the like can be referred to.
　強化繊維に含浸させる樹脂組成物は、エポキシ系のものが一般的であり、常温硬化型のエポキシ系樹脂組成物がより好ましい。常温硬化型を用いることで、加熱工程を経ることなく、塗工後常温で養生することで樹脂が硬化して、補強効果を得ることができる。 The resin composition to be impregnated with the reinforcing fibers is generally an epoxy-based one, and a room temperature-curable epoxy-based resin composition is more preferable. By using the room temperature curing type, the resin is cured by curing at room temperature after coating without going through a heating step, and a reinforcing effect can be obtained.
　以下、実施例及び比較例により本発明を具体的に説明する。
　表１は、各基層の材質・構成、エタノールの外表面１’（図１）に対する接触角および表面粗さを示す。又、参考として、エタノール以外のアルコール類（イソプロパノール（ＩＰＡ）及びブタノール（ＢｕＯＨ））および水との接触角も示す。尚、ＯＰＰは２軸延伸ポリプロピレンフィルムをあらわす。表１中の接触角はＪＩＳ　Ｒ　３２５７「基板ガラス表面のぬれ性試験」の静滴法により使用液体を種々変更して実施した。測定には、協和界面科学製の接触角計「Drop Master」（商品名）を用いた。また、表面粗さは、(株)東京精密製の「サーフコムTOUCH50」（商品名）を用いて測定した。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.
Table 1 shows the material and composition of each base layer, the contact angle of ethanol with respect to the outer surface 1'(FIG. 1), and the surface roughness. For reference, the contact angle with alcohols other than ethanol (isopropanol (IPA) and butanol (BuOH)) and water is also shown. OPP represents a biaxially stretched polypropylene film. The contact angles in Table 1 were carried out by changing the liquid used in various ways by the static drip method of JIS R 3257 “Wetting property test on the surface of the substrate glass”. A contact angle meter "Drop Master" (trade name) manufactured by Kyowa Interface Science was used for the measurement. The surface roughness was measured using "Surfcom TOUCH50" (trade name) manufactured by Tokyo Seimitsu Co., Ltd.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
（粘着剤Ａ）
　粘着剤層に使用する粘着剤Ａとして、２－エチルヘキシルアクリレート９７質量部及びアクリル酸３質量部を溶媒中で２,２'－アゾビス（イソブチロニトリル）を開始剤として重合し、固形分５０％のアクリル系ポリマーを得た。ベースポリマーとしてこのアクリル系ポリマー１００質量部と、イソシアネート系硬化剤（綜研化学社製、商品名Ｌ－４５）１質量部を含むアクリル系粘着剤Ａを準備した。 (Adhesive A)
As the pressure-sensitive adhesive A used for the pressure-sensitive adhesive layer, 97 parts by mass of 2-ethylhexyl acrylate and 3 parts by mass of acrylic acid were polymerized in a solvent using 2,2'-azobis (isobutyronitrile) as an initiator, and the solid content was 50. % Acrylic polymer was obtained. As a base polymer, an acrylic pressure-sensitive adhesive A containing 100 parts by mass of this acrylic polymer and 1 part by mass of an isocyanate-based curing agent (manufactured by Soken Kagaku Co., Ltd., trade name L-45) was prepared.
（粘着剤Ｂ）
　粘着剤層に使用する粘着剤Ｂとして、天然ゴム１００質量部、炭酸カルシム１５０質量部、粘着付与材（日本ゼオン製　クイントン（登録商標）Ｒ１００）１００質量部、プロセスオイル３０質量部を混錬したゴム系粘着剤Ｂを準備した。 (Adhesive B)
As the pressure-sensitive adhesive B used for the pressure-sensitive adhesive layer, 100 parts by mass of natural rubber, 150 parts by mass of calsim carbonate, 100 parts by mass of a tackifier (Quinton (registered trademark) R100 manufactured by Nippon Zeon), and 30 parts by mass of process oil were kneaded. A rubber-based adhesive B was prepared.
（粘着剤Ｃ）
　接合層に使用する粘着剤Ｃとして、固形分濃度６０質量％の付加硬化型シリコーン粘着原液（信越化学工業製　ＫＲ－３０７４）１００質量部、希釈溶剤としてトルエン５４質量部、硬化触媒として白金触媒０．５質量部を含むシリコーン系粘着剤Ｃを準備した。 (Adhesive C)
As the pressure-sensitive adhesive C used for the bonding layer, 100 parts by mass of an addition-curable silicone pressure-sensitive adhesive stock solution (KR-3074 manufactured by Shin-Etsu Chemical Industry Co., Ltd.) having a solid content concentration of 60% by mass, 54 parts by mass of toluene as a diluting solvent, and 0 platinum catalyst as a curing catalyst. A silicone-based pressure-sensitive adhesive C containing .5 parts by mass was prepared.
（下塗剤）
　下塗層に使用する下塗剤として、主剤（信越化学工業製　ＫＲ－３００６Ａ）１００質量部に対し、副剤（信越化学工業製　ＫＲ－３００６ＢＴ）１０質量部、触媒（信越化学工業製　ＣＡＴ－ＰＳ－８Ｓ）を配合し、適量のトルエンを加えた下塗剤を準備した。 (Primer)
As the primer used for the primer layer, 100 parts by mass of the main agent (KR-3006A manufactured by Shin-Etsu Chemical Co., Ltd.), 10 parts by mass of the auxiliary agent (KR-3006BT manufactured by Shin-Etsu Chemical Co., Ltd.), and the catalyst (CAT-PS manufactured by Shin-Etsu Chemical Co., Ltd.) -8S) was blended, and an undercoating agent was prepared by adding an appropriate amount of toluene.
（補層）
　補層として、レーヨンスフ（経糸３０番手・５０本／ｉｎｃｈ、緯糸３０番手・３５本／ｉｎｃｈ）を準備した。 (Complementary layer)
As a supplementary layer, rayon sufu (warp yarn 30 count, 50 yarns / inch, weft yarn 30 count, 35 yarns / inch) was prepared.
（離型剤Ａ）
　離型処理面を構成するための離型剤として、フッ素化シリコーン剥離剤（東レ・ダウコーニング製　ＳＹＬ－ＯＦＦ　Ｑ－７７８５）を用いて調製した固形分濃度０．５質量％の塗布液を準備した。 (Release agent A)
A coating liquid having a solid content concentration of 0.5% by mass prepared using a fluorinated silicone release agent (SYL-OFF Q-7785 manufactured by Toray Dow Corning) is prepared as a release agent for forming the release-treated surface. did.
（離型剤Ｂ）
　離型処理面を構成するための離型剤として、シリコーンゴム原料（信越化学工業製　ＫＥ－１９５０－１０）を準備した。 (Release B)
A silicone rubber raw material (KE-1950-10 manufactured by Shin-Etsu Chemical Co., Ltd.) was prepared as a mold release agent for forming the mold release surface.
（実施例１）
　予め片面に易接着処理を施したＰＥＴフィルム（東レ製　ルミラー（登録商標）　Ｓ－１０　＃５０）の他面に、離型剤Ａを塗布量５ｇ／ｍ２で塗布して乾燥することにより、離形処理面を形成した。次に、易接着処理面に粘着剤Ａをロールコート法により厚さが３０μｍとなるように塗布することで、マスキングシートを作製した。マスキングシートの総厚みは０．０８ｍｍであった。 (Example 1)
A release agent A is applied to the other surface of a PET film (Toray Mirror (registered trademark) S-10 # 50) that has been preliminarily subjected to an easy-adhesion treatment at a coating amount of 5 g / m 2 and dried. A mold release surface was formed. Next, a masking sheet was prepared by applying the pressure-sensitive adhesive A to the easy-adhesion-treated surface by a roll coating method so as to have a thickness of 30 μm. The total thickness of the masking sheet was 0.08 mm.
（実施例２）
　実施例１と同様に離型剤Ａを塗布し、乾燥させたＰＥＴフィルムに、粘着剤Ｂをカレンダーロールで塗布して厚さ１００μｍのゴム系粘着剤層を形成させることで、マスキングシートを作製した。マスキングシートの総厚みは０．１５ｍｍであった。 (Example 2)
A masking sheet is prepared by applying the release agent A to the dried PET film in the same manner as in Example 1 and applying the pressure-sensitive adhesive B with a calendar roll to form a rubber-based pressure-sensitive adhesive layer having a thickness of 100 μm. did. The total thickness of the masking sheet was 0.15 mm.
（実施例３）
　予め片面に易接着処理を施した厚さ１８０μｍのＰＴＦＥフィルム（バルカー製　７９９１）の他面に、実施例２と同様に粘着剤Ｂを塗布してマスキングシートを作製した。マスキングシートの総厚みは０．２８ｍｍであった。 (Example 3)
A masking sheet was prepared by applying the pressure-sensitive adhesive B to the other surface of a 180 μm-thick PTFE film (7991 manufactured by Valqua) in which one surface was previously subjected to an easy-adhesion treatment in the same manner as in Example 2. The total thickness of the masking sheet was 0.28 mm.
（実施例４）
　補層の両面に粘着剤Ｂをカレンダーロールで塗布して総厚さ０．５ｍｍの粘着シートを作製した。又、実施例１と同様、ＰＥＴフィルムの片面に離型剤Ａを塗布量５ｇ／ｍ２で塗布し、反対面にグラビアコート法で下塗剤を塗布した後、粘着剤Ｃをロールコーターで塗布して約８０μｍの接合層を形成させることにより、基層を作製した。この基層の接合層と粘着シートを積層して貼り合わせることにより、マスキングシートを作製した。マスキングシートの総厚みは０．６３ｍｍであった。 (Example 4)
Adhesive B was applied to both sides of the complementary layer with a calendar roll to prepare an adhesive sheet having a total thickness of 0.5 mm. Further, as in Example 1, the release agent A is applied to one side of the PET film at a coating amount of 5 g / m 2 , the primer is applied to the other side by the gravure coating method, and then the adhesive C is applied with a roll coater. A base layer was prepared by forming a bonding layer having a thickness of about 80 μm. A masking sheet was produced by laminating and adhering the bonding layer of the base layer and the adhesive sheet. The total thickness of the masking sheet was 0.63 mm.
（実施例５）実施例３と同様のＰＴＦＥフィルムの易接着処理面に、下塗剤をグラビアコート法で塗布した後、粘着剤Ｃをロールコーターで塗布して約８０μｍの接合層を形成させることにより、基層を作製した。この基層の接合層を、実施例４と同様の方法で作成した粘着シートと貼り合わせることにより、マスキングシートを作製した。マスキングシートの総厚みは０．７６ｍｍであった。 (Example 5) An undercoating agent is applied to the easily adhesive-treated surface of the PTFE film as in Example 3 by a gravure coating method, and then the adhesive C is applied with a roll coater to form a bonding layer of about 80 μm. To prepare a base layer. A masking sheet was produced by laminating the bonding layer of the base layer with an adhesive sheet prepared in the same manner as in Example 4. The total thickness of the masking sheet was 0.76 mm.
（実施例６）
　実施例１と同じく、ＰＥＴフィルムの易接着処理を施していない面に、離型剤Ｂを塗布した後、エンボスロールを通過させて表面に凹凸を形成させた。次に、易接着処理面に、実施例４と同様の方法で下塗層および粘着剤Ｃを塗布して接合層を形成させることにより、基層を作製した。この基層の接合層を、実施例４と同様の方法により作成した粘着シートと積層して貼り合わせることにより、マスキングシートを作製した。マスキングシートの総厚みは０．６６ｍｍであった。又、基層の外表面の表面粗さは、表１に記載の通り１４．６μｍであった。 (Example 6)
Similar to Example 1, the release agent B was applied to the surface of the PET film that had not been subjected to the easy-adhesion treatment, and then the surface was passed through an embossed roll to form irregularities on the surface. Next, the base layer was prepared by applying the undercoat layer and the pressure-sensitive adhesive C to the easy-adhesion-treated surface in the same manner as in Example 4 to form a bonding layer. A masking sheet was produced by laminating and adhering the bonding layer of the base layer with an adhesive sheet prepared by the same method as in Example 4. The total thickness of the masking sheet was 0.66 mm. The surface roughness of the outer surface of the base layer was 14.6 μm as shown in Table 1.
（実施例７）
　エンボスロールを通過させないこと以外は実施例６と同様の方法でマスキングシートを作製した。マスキングシートの総厚みは０．６５ｍｍであった。 (Example 7)
A masking sheet was prepared in the same manner as in Example 6 except that the embossed roll was not passed through. The total thickness of the masking sheet was 0.65 mm.
（実施例８）
　実施例５と同様の方法により作製したマスキングシートの粘着シートの外表面に、実施例４と同様の方法により作製した粘着シートを２枚貼り合わせたマスキングシートを作製した。マスキングシートの総厚みは１．７６ｍｍであった。 (Example 8)
A masking sheet was prepared by laminating two adhesive sheets prepared by the same method as in Example 4 on the outer surface of the adhesive sheet of the masking sheet prepared by the same method as in Example 5. The total thickness of the masking sheet was 1.76 mm.
（実施例９）
　実施例５と同様の方法により作製したマスキングシートの粘着シートの外表面に、実施例４と同様の方法により作製した粘着シートを８枚貼り合わせたマスキングシートを作製した。マスキングシートの総厚みは４．７６ｍｍであった。 (Example 9)
A masking sheet was prepared by laminating eight adhesive sheets prepared by the same method as in Example 4 on the outer surface of the adhesive sheet of the masking sheet prepared by the same method as in Example 5. The total thickness of the masking sheet was 4.76 mm.
（比較例１）
　実施例１で使用したＰＥＴフィルムを用い、このＰＥＴフィルムに離型剤を塗布しないこと以外は実施例１と同様の方法で、マスキングシートを作製した。マスキングシートの総厚みは０．０８ｍｍであった。 (Comparative Example 1)
Using the PET film used in Example 1, a masking sheet was prepared in the same manner as in Example 1 except that the release agent was not applied to the PET film. The total thickness of the masking sheet was 0.08 mm.
（比較例２）
　ＰＥＴフィルムをＯＰＰフィルム（東レ製　トレファン（登録商標）　＃３０－２５００Ｈ）に変えたこと以外は、比較例１と同様の方法で、マスキングシートを作製した。マスキングシートの総厚みは０．０９ｍｍであった。 (Comparative Example 2)
A masking sheet was produced in the same manner as in Comparative Example 1 except that the PET film was changed to an OPP film (Toray's Trefan (registered trademark) # 30-2500H). The total thickness of the masking sheet was 0.09 mm.
　樹脂組成物として三菱ケミカルインフラテック社製「エポサームレジン　ＸＬ－８００Ａ」（商品名）を使用し、以下の基準に基づき基層外表面の樹脂組成物はじき性（樹脂はじき性）、貼着面からの剥離性（剥離性）および作業者によるマスキングテープの取扱性（取扱性）を評価した。結果を表２に示す。
（樹脂はじき性）
　　◎：全面的にはじき、基層の外表面に玉状の樹脂組成物が形成されていた
　　○：全面的にはじき、樹脂組成物が基層外表面の面積の１０％以下に付着していた
　　△：部分的にはじき、樹脂組成物が基層外表面の面積の３０％以下に付着していた
　　×：樹脂をはじかず、全面に濡れ広がっていた。
（剥離性）
　　○：容易に剥離できた
　　△：樹脂組成物を除去した後、剥離できた
　　×：樹脂組成物が固まって剥離が困難であった（取扱性）
　　〇：容易に掴めた。
　　△：ゆっくりと触ると掴むことができた。
　　×：手袋を嵌めた状態では掴みづらいが、素手では掴むことが可能であった。 "Eposerm Resin XL-800A" (trade name) manufactured by Mitsubishi Chemical Infratec Co., Ltd. is used as the resin composition, and the resin composition on the outer surface of the base layer is repellent (resin repellent) and peeled from the sticking surface based on the following criteria. The property (peeling property) and the handleability (handleability) of the masking tape by the operator were evaluated. The results are shown in Table 2.
(Repellent resin)
⊚: The entire surface was repelled, and a ball-shaped resin composition was formed on the outer surface of the base layer. ○: The entire surface was repelled, and the resin composition adhered to 10% or less of the area of the outer surface of the base layer. Partially repelled and the resin composition adhered to 30% or less of the area of the outer surface of the base layer. ×: The resin was not repelled and was wet and spread over the entire surface.
(Removability)
◯: Easy peeling Δ: After removing the resin composition, peeling was possible ×: The resin composition was solidified and peeling was difficult (handleability)
〇: Easy to grasp.
Δ: I was able to grasp it by touching it slowly.
X: It was difficult to grasp with gloves on, but it was possible to grasp with bare hands.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２に記載の通り、本発明に係るマスキングシートは、基層の外表面のエタノール接触角が３０°以上であることで、樹脂組成物を弾くことができた。これにより、樹脂組成物が固まった後も剥離が容易であった。又、適当な厚みを有することにより、取扱性も良好であった。更に、基層の外表面が凹凸を形成したマスキングシート（実施例６）は、外表面が平坦なもの（実施例７）と比較して樹脂組成物の弾き性が高く、取扱性も良好であった。 As shown in Table 2, the masking sheet according to the present invention was able to repel the resin composition when the ethanol contact angle on the outer surface of the base layer was 30 ° or more. As a result, peeling was easy even after the resin composition had hardened. Further, by having an appropriate thickness, the handleability was also good. Further, the masking sheet (Example 6) in which the outer surface of the base layer has irregularities has higher resilience and handleability of the resin composition as compared with the one having a flat outer surface (Example 7). It was.
　実施例１～実施例３のマスキングシートは、厚さが０．２ｍｍ程度であることから、樹脂組成物を塗布した後の剥離作業にかかる作業性が他の実施例と比較して若干劣る結果であった。又、実施例９のマスキングシートは厚みが４．７６ｍｍであるため、樹脂組成物を塗布する際、コテやローラーに若干干渉し、この点では作業性に劣るものであったが、貼着作業や剥離作業は良好に行うことができた。 Since the masking sheets of Examples 1 to 3 have a thickness of about 0.2 mm, the workability of the peeling work after applying the resin composition is slightly inferior to that of the other examples. Met. Further, since the masking sheet of Example 9 has a thickness of 4.76 mm, it slightly interferes with the iron and rollers when the resin composition is applied, and in this respect, the workability is inferior. And peeling work could be done well.
　このように、本発明にかかるマスキングシートは、基層の外表面で樹脂組成物をはじくため、複数回の塗装を行っても剥離作業性が良好である。又、複数回の塗工に対し、剥離作業を１回のみ行えば良いため、廃棄物の削減という効果も有する。 As described above, since the masking sheet according to the present invention repels the resin composition on the outer surface of the base layer, the peeling workability is good even if the coating is applied a plurality of times. Further, since the peeling work only needs to be performed once for a plurality of coatings, it also has an effect of reducing waste.
　１　基層
　１’　外表面
　２　基材
　３　粘着シート
　４　粘着剤層
　４’　外表面
　５　マスキングシート
　６　離型処理面
　７　補層
　８　接合層
　９　下塗層
２１　道路床版
２２　樹脂強化繊維
２３　露出部
３１　マスキングシート
３２　１層目強化繊維
３３　２層目強化繊維
４１　道路床版
４２　プライマー
４３，４４　樹脂組成物 1 Base layer 1'Outer surface 2 Base material 3 Adhesive sheet 4 Adhesive layer 4'Outer surface 5 Masking sheet 6 Demolding surface 7 Complementary layer 8 Bonding layer 9 Primer layer 21 Road deck 22 Resin reinforcing fiber 23 Exposed part 31 Masking sheet 32 1st layer reinforcing fiber 33 2nd layer reinforcing fiber 41 Road deck 42 Primer 43,44 Resin composition

Claims (12)

  1. 　少なくとも、基層と、粘着剤層を有する粘着シートとが積層一体化されたマスキングシートであって、前記マスキングシートの表面の一端側には前記粘着剤層が配置され、前記マスキングシートの表面の他端側には前記基層が配置され、前記マスキングシートの外表面にあたる前記基層の外表面は、エタノールの接触角が３０°以上の面である、マスキングシート。 At least, it is a masking sheet in which a base layer and an adhesive sheet having an adhesive layer are laminated and integrated, and the adhesive layer is arranged on one end side of the surface of the masking sheet, and other than the surface of the masking sheet. A masking sheet in which the base layer is arranged on the end side, and the outer surface of the base layer, which is the outer surface of the masking sheet, is a surface having an ethanol contact angle of 30 ° or more.
  2. 　前記基層の前記外表面の材質が、フッ素系樹脂又はフッ素系ゴムである請求項１に記載のマスキングシート。 The masking sheet according to claim 1, wherein the material of the outer surface of the base layer is a fluorine-based resin or a fluorine-based rubber.
  3. 　前記基層の前記外表面の材質が、シリコーン系樹脂又はシリコーン系ゴムである請求項１に記載のマスキングシート。 The masking sheet according to claim 1, wherein the material of the outer surface of the base layer is a silicone-based resin or a silicone-based rubber.
  4. 　前記基層の前記外表面の材質が、フッ素化シリコーン系樹脂又はフッ素化シリコーン系ゴムである請求項１に記載のマスキングシート。 The masking sheet according to claim 1, wherein the material of the outer surface of the base layer is a fluorinated silicone resin or a fluorinated silicone rubber.
  5. 　前記基層の前記外表面の表面粗さが３μｍ以上、３０μｍ以下である請求項１乃至４のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 4, wherein the surface roughness of the outer surface of the base layer is 3 μm or more and 30 μm or less.
  6. 　前記基層および前記粘着シートを積層一体化した後の総厚みが０．２ｍｍ以上、５．０ｍｍ以下である請求項１乃至５のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 5, wherein the total thickness after laminating and integrating the base layer and the adhesive sheet is 0.2 mm or more and 5.0 mm or less.
  7. 　前記基層および前記粘着シートを積層一体化した後の総厚みが０．４ｍｍ以上、２．０ｍｍ以下である請求項１乃至５のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 5, wherein the total thickness after laminating and integrating the base layer and the adhesive sheet is 0.4 mm or more and 2.0 mm or less.
  8. 　略四角形状に成型された形状を有する請求項１乃至７のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 7, which has a shape molded into a substantially square shape.
  9. 　前記粘着剤層が、ゴム系粘着剤により構成されている請求項１乃至８のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 8, wherein the pressure-sensitive adhesive layer is made of a rubber-based pressure-sensitive adhesive.
  10. 　前記粘着剤層が、アクリル系粘着剤により構成されている請求項１乃至８のいずれか１項に記載のマスキングシート。 The masking sheet according to any one of claims 1 to 8, wherein the pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive.
  11. 　道路床版の下面に、少なくとも帯状の強化繊維を第１の方向に所定の間隔を開けて設置して樹脂含浸し、さらに、前記帯状の強化繊維を前記第１の方向と直交する第２の方向に所定の間隔を開けて設置して樹脂含浸し、格子状の繊維強化樹脂構造体を形成して補強する道路床版の補強方法において、少なくとも前記帯状の強化繊維を前記第１の方向に所定の間隔を開けて設置する前に、格子状の繊維強化樹脂構造体の非被覆部に請求項１乃至１０のいずれか１項に記載のマスキングシートを配置する工程を有する道路床版の補強方法。 At least strip-shaped reinforcing fibers are installed on the lower surface of the road deck at predetermined intervals in the first direction and impregnated with resin, and further, the strip-shaped reinforcing fibers are placed in a second direction orthogonal to the first direction. In a method for reinforcing a road deck, which is installed at a predetermined interval in a direction and impregnated with resin to form and reinforce a lattice-shaped fiber reinforced resin structure, at least the strip-shaped reinforcing fibers are placed in the first direction. Reinforcement of a road deck having a step of arranging the masking sheet according to any one of claims 1 to 10 on an uncoated portion of a grid-like fiber reinforced resin structure before installation at a predetermined interval. Method.
  12. 　各方向の全ての樹脂含浸を含む工程の最後にのみ前記マスキングシートを剥離する工程を有する請求項１１に記載の道路床版の補強方法。 The method for reinforcing a road deck according to claim 11, further comprising a step of peeling off the masking sheet only at the end of a step including impregnation of all resins in each direction.
PCT/JP2020/046815 2019-12-27 2020-12-15 Masking sheet and method for reinforcing road floor slab using same WO2021131922A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004027718A (en) * 2002-06-27 2004-01-29 Sho Bond Constr Co Ltd Sheet for repair / reinforcement / deterioration prevention of concrete structure and repair / reinforcement / deterioration prevention method of concrete structure
JP2010194715A (en) * 2009-02-20 2010-09-09 Nitto Denko Corp Surface protective sheet
JP2012111113A (en) * 2010-11-24 2012-06-14 Lintec Corp Release film for molding ceramic green sheet and method for producing the same
JP2015048388A (en) * 2013-08-30 2015-03-16 東洋アルミニウム株式会社 Adhesive tape suitable for adhesion to water-repellent surface
WO2019012655A1 (en) * 2017-07-13 2019-01-17 株式会社寺岡製作所 Multi-layer masking sheet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004027718A (en) * 2002-06-27 2004-01-29 Sho Bond Constr Co Ltd Sheet for repair / reinforcement / deterioration prevention of concrete structure and repair / reinforcement / deterioration prevention method of concrete structure
JP2010194715A (en) * 2009-02-20 2010-09-09 Nitto Denko Corp Surface protective sheet
JP2012111113A (en) * 2010-11-24 2012-06-14 Lintec Corp Release film for molding ceramic green sheet and method for producing the same
JP2015048388A (en) * 2013-08-30 2015-03-16 東洋アルミニウム株式会社 Adhesive tape suitable for adhesion to water-repellent surface
WO2019012655A1 (en) * 2017-07-13 2019-01-17 株式会社寺岡製作所 Multi-layer masking sheet

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