JP2017066237A - Adhesive tape or sheet for coat sealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive or a sheet for coat sealing good in coat sealing workability, capable of injecting a repair material in short time from adhesion, further capable of easily being removed without damaging a structure surface which is an adherend after injection repair curing and capable of being marketed with suppressing manufacturing cost without occurring adhesive residue to concrete or the repair material.SOLUTION: There is provided an adhesive or a sheet for coat sealing containing at least a supporter layer and an adhesive layer, having average thickness of the supporter layer of 60 to 200 μm and Young modulus of the supporter layer of 0.5 GPa or more and 90° peel adhesive force under operation environment at 5 to 40°C at 30 minutes after adhesion of 3 N/10 mm or more and 90° peel adhesive force under operation environment at 5 to 40°C at 24 hours after adhesion of 20 N/10 mm or less and used during repairing crack, depression or the like of a structure.SELECTED DRAWING: None

Description

  The present invention is intended to prevent the repair material to be injected from overflowing or swelling more than necessary in the low pressure injection method in which repair is performed by injecting a repair material into a repair-required portion such as a crack or a dent of a structure. Or, it relates to a pressure-sensitive adhesive tape or sheet for covering sealing, which is applied in a state of covering the surface of the repair-necessary part in order to prevent the repair material from being partially filled with the repair material due to insufficient injection pressure. It is.

  One of the repair methods for cracks and dents in structures is the low-pressure injection method. This is a method of repairing cracks, dents, etc. by filling a repair material by injecting it with a dedicated tool that can be injected under pressure. Examples of the repair material include epoxy resin-based repair materials conforming to JIS A 6024, acrylic resin-based repair materials, cement-based repair materials, foamed epoxy resin-based repair materials, and the like. When injecting these repair materials into cracks, dents, etc., in order to prevent the repair material to be injected from overflowing or rising more than necessary, or due to insufficient injection pressure, the repair material may be partially applied In order to prevent the repair material from being filled, when injecting the repair material, it is necessary to cover the surface of the repair-required portion with something so that the portion is covered. Conventionally, a curable re-peelable coating sealant (in the form of a paste) has been used to cover the portion. The covering state is completed by applying and curing the covering sealing material so as to cover the surface of the repair-needed portion, and the repairing material can be injected. The repair material is injected before the coating sealing material is applied in a state of covering the surface of the structure where the repair is required, and the inlet part with the through-hole is placed in an arbitrary position on the repair required in advance. Then, a special instrument capable of pressure injection is set in the through-hole of the injection port part. The covering sealant is also used for fixing the inlet part to the repair-required portion. The coating sealing material is applied in a ring shape to the inlet part so that the through-hole is not blocked, and is fixed by crimping it to a repair-required portion. After filling through the inlet port of the inlet part and filling and curing the repair material at the point where repair is required, the cured coating sealant and the fixed inlet part are removed from the repair point and removed. Repair work is completed.

  A series of steps required for the repair method and the low-pressure injection method requires 24 hours (spring-autumn) to 48 hours (winter) to cure the coating sealant, and after that has been cured, the repair material is injected. It takes about 24 hours (spring to autumn) to 48 hours (winter) to cure the repair material. Therefore, the construction method requires at least 48 hours (spring to autumn) to 96 hours (winter) as a whole, and has a problem that the construction period becomes long.

  On the other hand, an adhesive having a short curing time may be used instead of the covering sealant for shortening the work period. In this case, since the adhesive instead of the covering sealant is cured in about 1 hour, the repair material can be injected in a relatively short time after the adhesive is applied. For this reason, a series of steps required for the repair method can be performed in an operation time of about 25 hours (spring to autumn) to 49 hours (winter), and the work period can be shortened as compared with the case where the covering sealant is used. However, since the adhesive does not have removability, when the adhesive is removed after the repair material is injected and cured, the adhesive is strongly adhered to the adherend and cannot be easily removed. After scraping off with a spatula or knife, the residue on the adherend must be scraped off with a grinder or the like. Therefore, when an adhesive with a short curing time is used to cover the surface of the area where repair is required, it takes time to remove, and the surface condition of the same part differs from that of the other part to scrape off the remaining part. , Have a problem that looks worse.

  Furthermore, instead of the coating sealing material, a coating sealing pressure-sensitive adhesive tape or sheet using a laminated body of glass fiber cloth and plastic film as a support may be used (Patent Document 1). In this case, as in the case of using an adhesive having a short curing time, a series of steps required for the repair method can be performed in an operation time of about 25 hours (spring to autumn) to 49 hours (winter). The construction period can be shortened compared to the case of using a sealing material.

Patent Publication No. 3974501

  However, in the coating sealing material according to Patent Document 1 and other conventional coating sealing materials, in a low-pressure injection method in which repair is performed by injecting a repair material into a repair-necessary portion such as a crack or a dent in a structure, Although the pressure property is good, a thick glass cloth laminated film is used for the support layer, so it is necessary to make the adhesive extremely thick in order to ensure followability at the stepped portion existing in the structure. (In the example of Patent Document 1, the pressure-sensitive adhesive layer is 300 μm to 500 μm). Thereby, the adhesive tape for repair after hardening of repair material had a problem that it was hard to peel off and it was inferior to workability | operativity.

  Therefore, the present invention prevents the repair material to be injected from overflowing or swelling more than necessary in the low-pressure injection method in which repair is performed by injecting a repair material into a repair-required portion such as a crack or a dent of the structure. In order to prevent the repairing material from being partially filled with the repairing material due to insufficient injection pressure, the adhesive tape or sheet for covering sealing to be applied in a state of covering the surface of the repairing required part However, the coating sealing workability is good even in a wide range of temperature environments, the repair material can be injected in a short time after application, and after the injection repair material is cured, the surface of the structural object that is the adherend is easily damaged. An object of the present invention is to provide a product which can remove the adhesive tape or sheet and does not cause adhesive residue on concrete or a repair material.

  The inventors of the present invention have made extensive studies on conventional coated sealing materials and have found the following specific problems. In the coating sealing material, since the thick support is stiff, it is necessary to increase the thickness of the pressure-sensitive adhesive layer in order to adhere and follow a non-smooth adherend such as an uneven surface or curved surface. If the pressure-sensitive adhesive layer is thickened, the adhesive tape or sheet will stick to the adherend, and the adhesive force will increase over time. A considerable force is required, and it takes time to remove the adhesive remaining on the adherend. Moreover, when the pressure-sensitive adhesive tape or the entire sheet is thickened by increasing the thickness of the support and the pressure-sensitive adhesive layer, the winding diameter is increased when the product is wound into a roll. When an operator affixes to a repair-needed place, it is necessary to carry out the work with the pressure-sensitive adhesive tape or sheet carried, but it becomes difficult to handle as the winding diameter increases, so to keep the winding diameter below a certain level. It is necessary to shorten the winding length. For this reason, the adhesive tape or sheet disappears with little work, and it is necessary to frequently replace the roll with a new roll in a short time, which is very troublesome for an operator who performs sticking outdoors.

  Based on the above-mentioned problems, the present inventors have further conducted extensive research, and as a result, in the pressure-sensitive adhesive tape or sheet for covering sealing comprising at least a support layer and an adhesive layer, the “support layer thickness”, “support layer Young's modulus” By making each parameter such as “90 ° peel adhesion to the adherend structure surface (30 minutes after application / 24 hours after application)” within a specific range, the coating sealing workability is good, and as a result From this, it was found that the repair material can be injected in a short time, and that the adhesive tape or sheet can be easily removed after the injection repair material is cured without damaging the surface of the structural object as the adherend. Based on this, the present invention has been completed.

  That is, the present invention (1) relates to a support layer thickness (average thickness) in an adhesive tape or sheet for covering sealing, which is used at the time of repairing cracks, dents, etc. of a structure and includes at least a support layer and an adhesive layer. ) Is 60 to 200 μm and the Young's modulus of the support layer in an environment of 5 to 40 ° C. is 0.5 GPa or more, and is a predetermined temperature {5 to 40 ° C. after 30 minutes of application, more specifically (1 ) 5 ° C, (2) 23 ° C and (3) 40 ° C. }, The 90 ° peel adhesive strength under the working environment held in 3} satisfies 10N / 10 mm or more. As a result, the repair material injected from the end of the tape does not overflow or the tape swells, and the 90 ° peel adhesive force to the structure surface that is the adherend is maintained at the predetermined temperature. In addition, since it is 20 N / 10 mm or less after 24 hours from the pasting, it can be easily removed from the adherend without damaging the surface of the structure, which is the adherend, and the adhesive remains on the concrete or repair material. An adhesive tape or sheet for covering sealing is provided. Under the present circumstances, as a measuring method of adhesive strength {90 degree peel adhesive strength (30 minutes after sticking, 24 hours later)}, it follows the test method mentioned later.

  Further, the present invention (2) is the coating sealing pressure-sensitive adhesive tape or sheet according to the invention (1), wherein the pressure-sensitive adhesive layer contains a styrene-based elastomer and a tackifier resin, and 100 parts by weight of the styrene-based elastomer. It is characterized by containing 40 to 120 parts by weight of tackifying resin, and repair material can be injected in a short time from sticking, and after the repair material has been cured, it can be easily removed without damaging the surface of the structural object that is the adherend. The present invention also provides a pressure-sensitive adhesive tape or sheet for covering sealing that does not cause adhesive residue on concrete or a repair material. When the tackifying resin is less than 40 parts by weight or more than 120 parts by weight with respect to 100 parts by weight of the styrene elastomer, the adhesive strength becomes 3N / 10 mm or less, and the repair material injected from the end of the tape overflows or the tape rises. There is a case. In particular, when it exceeds 120 parts by weight and peels off after 24 hours at 40 ° C., adhesive residue may be generated on the concrete.

  Further, the present invention (3) is the pressure-sensitive adhesive tape or sheet for covering sealing according to the invention (1) or (2), wherein the pressure-sensitive adhesive layer contains a styrene elastomer and a softener, and 100 parts by weight of the styrene elastomer. The softening agent is contained in an amount of 20 to 60 parts by weight, so that the repair material can be injected in a short time from the sticking, and after the injection repair material is cured, the surface of the structural object as the adherend is easily damaged. The present invention provides a pressure-sensitive adhesive tape or sheet for covering sealing that can be removed at the same time and does not cause adhesive residue on concrete or a repair material. If the softener is less than 20 parts by weight with respect to 100 parts by weight of the styrene elastomer, the adhesive strength to concrete is 3 N / 10 mm under 5 ° C. conditions, and if it exceeds 60 parts by weight under 40 ° C. conditions. The repair material injected from the end of the tape may overflow or the tape may rise. In particular, when the amount exceeds 60 parts by weight, there may be a case where an adhesive residue is generated in the concrete when peeling after 30 minutes at 23 ° C., after 30 minutes at 40 ° C., and after 24 hours. Furthermore, adhesive residue may occur in the epoxy resin repair material.

  In addition, this invention is the adhesive tape or sheet | seat for coating sealing containing at least a support body layer and an adhesive layer, The thickness (average thickness) of the said support body layer is 60 micrometers-200 micrometers, and 5- The Young's modulus in an environment of 40 ° C. is 0.5 or more, and the pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive containing a styrene-based elastomer, a tackifying resin, and a softening agent. On the other hand, it contains 40 to 120 parts by weight of a tackifying resin, and 20 to 60 parts by weight of the softening agent with respect to 100 parts by weight of the styrenic elastomer, It may be a pressure-sensitive adhesive tape or sheet for covering sealing used for repairing dents or the like.

  The present invention provides good coating sealing workability even in a wide range of temperature environments, allows repair material to be injected in a short time after application, and after curing the repair material, removes the surface of the structural object that is the adherend easily without damaging it. Provided is an adhesive tape or sheet for covering and sealing that does not cause adhesive residue on concrete or a repair material.

FIG. 1 is a side view of an adhesive tape or sheet for covering sealing comprising a support layer and an adhesive layer according to this embodiment. FIG. 2 is a side view of a pressure-sensitive adhesive tape or sheet for covering sealing comprising a support layer, an adhesive layer and a release liner according to this embodiment. FIG. 3 is a conceptual diagram in which the adhesive tape or sheet for covering sealing according to this embodiment is applied to a crack in a structure and a repair-required portion {(a) is a conceptual diagram of a crack in the structure and a repair-required portion, (B) is a conceptual top view of an adhesive tape or sheet for covering sealing applied to a cracked or repaired part of a structure, and (c) is an adhesive tape or sheet for covering sealing applied to a cracked or repaired part of a structure. It is an affixed conceptual side view}. FIG. 4 is a conceptual diagram in which an inlet part is arranged and fixed on the surface of a pressure-sensitive adhesive tape or sheet for covering sealing according to the present embodiment, which is cracked in a structure and attached to a place where repair is required {(a) is a pressure-sensitive adhesive for covering sealing. It is a conceptual top view which has arrange | positioned and fixed the inlet part on the surface of a tape or a sheet | seat, (b) is a conceptual side view which has arrange | positioned and fixed the inlet part on the surface of the pressure-sensitive adhesive tape or sheet for covering sealing}. FIG. 5 shows that the inlet part is arranged and fixed on the surface of the pressure-sensitive adhesive tape or sheet for covering sealing according to the present embodiment, which is attached to a cracked or repaired part of the structure, and can be injected under pressure into the through-hole of the inlet part. It is a conceptual diagram in which a special instrument is set and repair material is injected and filled into a repair-required part. Is a conceptual side view in which is injected and filled, and (b) is a conceptual side view in which a dedicated instrument that has been injected under pressure is removed after the injected repair material is cured}. Fig. 6 shows a state where the adhesive tape or sheet for covering sealing is removed from the repair-required part while the inlet part is still on the surface, and the repair material is filled and cured in the repair-required part, a series of repair processes. It is a conceptual diagram of the repair location where the repair has been completed {(a) is a conceptual side view of the repair location where the series of repair steps have been completed, and (b) is a conceptual top view of the repair location where the series of repair steps has been completed. }. FIG. 7 is a conceptual side view of a T-type peel test in the repair material adhesive residual test method according to the present example. FIG. 8 is a photograph of a severe test crack panel in the injection pressure test method according to this example.

  Hereinafter, a specific embodiment of the present invention (hereinafter referred to as this embodiment) will be described in detail. In addition, this invention is not limited to the following aspect. In the present embodiment, “support” and “support layer”, “adhesive” and “adhesive layer” may be used without distinction.

<Structure of adhesive tape or sheet>
As shown in FIG. 1, the pressure-sensitive adhesive tape or sheet for covering sealing according to this aspect comprises at least a support layer and an adhesive layer. In addition, the pressure-sensitive adhesive tape or sheet for covering sealing according to this aspect may further include other layers as necessary. For example, as shown in FIG. 2, the pressure-sensitive adhesive tape or sheet for covering sealing may have a release liner on the pressure-sensitive adhesive layer as necessary. Moreover, the pressure-sensitive adhesive tape or sheet for covering sealing according to this aspect may be formed in a roll shape as shown in FIGS. 1 (b) and 2 (b). Hereinafter, the pressure-sensitive adhesive tape or sheet for covering sealing of the present invention will be described.

〔Adhesive force〕
The adhesive tape or sheet for covering sealing of the present invention has a 90 ° peel adhesive force to the adherend made of the repair material injected and filled in the surface of the structure around the repair required part and the repair required part, and the temperature of the working environment is increased. 5 to 40 ° C. {Specifically, (1) 5 ° C., (2) 23 ° C. and (3) 40 ° C. }, It is 3 N / 10 mm or more after 30 minutes of application and 20 N / 10 mm or less after 24 hours of application. Furthermore, it is more preferable in it being 15 N / 10mm or less 24 hours after sticking. If the adhesive strength is less than 3 N / 10 mm after 30 minutes of application, the repair material injected from the end of the tape may overflow or the tape may rise when the repair material is injected. When the adhesive strength exceeds 20 N / 10 mm after 24 hours of sticking, it is necessary to peel off with a strong force when removing the adhesive tape or sheet after the repair material is cured, and peeling workability may deteriorate. The adhesive strength (90 ° peel adhesive strength) is a numerical value measured by the following test method.

(Test method)
Cut the adhesive tape or sheet to be measured into 10mm width x 150mm, and use a # 180 polished ISO standard sand mortar panel with either (1) 5 ° C, (2) 23 ° C or (3) 40 ° C In an environment where the humidity is 40 to 50% RH, two reciprocating rollers are pressure-bonded at a speed of 600 mm / min using a pressure roller having a mass of 2 kg. Then, in each environment, it is left still for a predetermined time and a 90 degree peeling test is performed. The peeling speed at the time of measurement is 300 mm / min. The mortar panel using the # 180 polished ISO standard sand as the measurement target adhesive tape and the adherend is in each environment (an environment equivalent to the environment during the peeling test). Use one that has been allowed to stand for 24 hours or more.

(Adhesive layer)
The pressure-sensitive adhesive used in the pressure-sensitive adhesive tape or sheet for covering sealing of the present invention is not particularly limited, and examples thereof include various types such as rubber-based, acrylic-based, urethane-based, silicone-based, polyolefin-based, and ethylene / vinyl acetate copolymer systems. Although an adhesive can be used, it is preferable to include a rubber-based adhesive from the viewpoint of removability of the repair material, and from the viewpoint of productivity, it also includes a styrene-based elastomer suitable for application by the hot melt method. It is more preferable. The styrene elastomer used in the pressure-sensitive adhesive of the present invention is not particularly limited, and for example, various styrene elastomers such as a styrene isoprene copolymer, a styrene butadiene copolymer, or a hydrogenated product thereof are used. I can do it.
Furthermore, the pressure-sensitive adhesive used in the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention preferably contains 40 to 120 parts by weight of a tackifier resin with respect to 100 parts by weight of the styrene elastomer. The tackifying resin used in the pressure-sensitive adhesive of the present invention is not particularly limited. For example, various tackifying resins such as rosin ester resins, terpene resins, phenol resins, petroleum resins, or hydrogenated products thereof. Can be used (a plurality of types of tackifying resins may be used in combination). When the tackifying resin contained in the pressure-sensitive adhesive layer is less than 40 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, cracks on the surface of the structure and adhesion to the area around the repair required are insufficient, and the repair material is injected under pressure. At this time, the bonded portion may be lifted or peeled off, and the repair material may leak out. On the other hand, even if the tackifier resin contained in the pressure-sensitive adhesive layer exceeds 120 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the pressure-sensitive adhesive becomes hard and the repair material may leak out. Furthermore, adhesive residue may occur in the epoxy resin-based repair material at the time of peeling 24 hours after application.

  Moreover, as an adhesive used for the adhesive tape or sheet | seat for coating sealing of this invention, it is preferable to contain 20-60 weight part of softening agents with respect to 100 weight part of this styrene-type elastomer. The softening agent used in the pressure-sensitive adhesive of the present invention is not particularly limited, and examples thereof include various process oils such as naphthenic and paraffinic process oils, liquid polybutadiene, liquid butyl rubber, low molecular weight polyisobutylene, medium molecular weight polyisobutylene, and polybutene. A softener can be used (a plurality of softeners may be used in combination). When the softening agent contained in the adhesive layer is less than 20 parts by weight relative to 100 parts by weight of the styrene elastomer, it is pasted in cases where the structure needs to be repaired, such as cracks and dents, is not smooth or at low temperatures in winter. The initial adhesiveness of the adhesive tape or sheet is insufficient, and a gap is formed between the adhesive tape and the sheet. When the repair material is injected under pressure, the repair material may leak out. On the other hand, when the softening agent contained in the pressure-sensitive adhesive layer exceeds 60 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the adhesive tape or sheet to be applied is insufficiently fixed at high temperatures in summer, and the repair material is When pressure is injected, repair material may leak out. At the same time, cohesive failure is likely to occur, and when the adhesive tape or sheet is removed after the repair material has been cured, the adhesive may remain on the surface of the structure, where repair is required, or in the repair material.

  Moreover, the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention may contain an ultraviolet absorber, an ultraviolet stabilizer, an antioxidant, a filler and the like in the pressure-sensitive adhesive layer. Although the amount of addition depends on the additive component to be blended, the amount of 0.001 to 50 parts by weight, preferably 0.1 to 30 parts by weight, is suitably blended with respect to the weight of the pressure-sensitive adhesive.

(Support layer)
The support used for the pressure-sensitive adhesive tape or sheet for covering sealing of the present invention is not particularly limited, and for example, a plastic film, a nonwoven fabric, paper, a cloth, a metal foil, and a composite thereof can be used. The material is not particularly limited. For example, polyolefin materials such as polypropylene, ethylene propylene copolymer, ethylene butene-1 copolymer, ethylene octene copolymer, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer, etc. , Polyvinyl alcohol materials, acrylic materials such as polymethyl methacrylate, polyester materials such as polyethylene terephthalate and polybutylene terephthalate, polyamide materials such as nylon 6, nylon 6 and 6, metal ions such as zinc and sodium in the structure Various ionomer materials with styrene, styrene materials such as polystyrene, styrene isoprene copolymer, styrene butadiene copolymer, polyurethane materials, vinyl chloride materials, fluorine materials, cellulose materials such as acetate and cellophane, Yung, cotton or the like, aluminum, copper, silver, gold, may be used in combination of tin, metals such as stainless steel, one of the various materials or of two or more. The support is not particularly limited, but a biaxially stretched polypropylene film or a biaxially stretched polyester film is preferable. Preferably, a primer made of an acrylic resin, a vinyl copolymer, a modified polyolefin resin, a rubber resin, a polyester resin, or a polyurethane resin is applied to one side of the film and dried, and then an adhesive is applied on the primer. Apply.

  Moreover, it is preferable that the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention has a support layer thickness of 60 μm or more and a Young's modulus of the support layer in an environment of 5 to 40 ° C. is 0.5 GPa or more. If this condition is not satisfied, in the low pressure injection method of injecting the repair material, the repair material injected from the tape end overflows or the tape rises. In addition, it is necessary to increase the strength of the support to prevent the adhesive tape or sheet from being cut, and it is necessary to increase the thickness of the support or to use expensive high-functional materials. There is. The upper limit value of Young's modulus is not particularly limited, but is, for example, 1500 GPa (in particular, when a plastic film is used as the base material, the upper limit value of Young's modulus may be 10 GPa). Here, the Young's modulus is measured based on ASTM-D-882. More specifically, using a tensile tester, the sample was pulled at a speed of 200 mm / min, and the maximum elasticity (within the S-S curve maximum slope) immediately before the sample was deformed (within 1% elongation). It is obtained from the linear equation. In addition, “Young's modulus in an environment of 5 to 40 ° C. is 0.5 GPa or more” means “when the environmental temperature is (1) 5 ° C., (2) 20 to 23 ° C., (3) 40 ° C. All of the Young's moduli may be 0.5 GPa or more. Furthermore, “Young's modulus when the environmental temperature is 40 ° C. may be 0.5 GPa or more”.

  Furthermore, the adhesive tape or sheet for covering sealing of the present invention preferably uses a transparent plastic film or the like as a support in order to confirm the filling state of the repair material to be injected into the repair-needed portion.

〔thickness〕
The pressure-sensitive adhesive tape or sheet for covering sealing of the present invention has a total thickness (average total thickness) of the pressure-sensitive adhesive tape or sheet comprising at least the support layer and the pressure-sensitive adhesive layer, or at least the support layer, the pressure-sensitive adhesive layer and the release liner. Is preferably 300 μm or less. If the total thickness exceeds 300 μm, the material costs and process costs such as adhesive application processing increase as the thickness increases, so that the manufacturing cost of the adhesive tape or sheet is considerably high and the sales price of the product is also high. You may be forced to make it. In addition, when wound as a product in a roll shape, the winding diameter becomes large, and when an operator attaches it to a place where repair is necessary, it is necessary to carry out the work while carrying the adhesive tape or sheet. Since it becomes difficult to handle when it becomes large, it is necessary to shorten the winding length in order to keep the winding diameter below a certain level, and it is necessary to change to a new roll frequently in a short time. It may be very complicated work for a person. The lower limit value of the total thickness (average total thickness) of the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention is not particularly limited, but is, for example, 65 μm, and preferably 140 μm.

  Moreover, it is preferable that the adhesive tape or sheet for coating sealing of this invention is 80-280 micrometers in thickness (average thickness) of an adhesive. If the thickness of the pressure-sensitive adhesive is less than 80 μm, the surface of the structure cracks, the adhesion to the periphery of the area where repair is necessary is insufficient, and when the repair material is injected under pressure, the bonded part will float or peel off, Repair material may leak out. On the other hand, if the thickness of the pressure-sensitive adhesive exceeds 280 μm, the surface of the structure is cracked, the adhesive force to the repair-necessary part and the repair material becomes too high, and it is strong when removing the pressure-sensitive adhesive tape or sheet after the repair material is cured. It is necessary to peel off with force, and peeling workability may deteriorate.

  Furthermore, the pressure-sensitive adhesive tape or sheet for covering sealing of the present invention preferably has a support thickness (average thickness) of 60 to 200 μm. When the thickness of the support is less than 60 μm, when pressure is applied to the repair material, the repair material injected from the end of the tape may overflow or the tape may rise, and the adhesive tape may be cured after the repair material is cured. Or when removing a sheet | seat, this adhesive tape or a sheet | seat may extend greatly, and it may become difficult to peel or may fracture | rupture. On the other hand, when the thickness of the support exceeds 200 μm, the stiffness of the support becomes strong, and the followability of the adhesive tape or sheet to be applied when the repaired parts such as cracks and dents of the structure are not smooth. Adhesiveness is insufficient, and a gap is formed between the surface and the repair material. When the repair material is injected under pressure, the repair material may leak out.

  The support layer and the pressure-sensitive adhesive layer preferably have a thicker pressure-sensitive adhesive layer in the average thickness. When applying the adhesive tape or sheet for covering sealing while covering the surface of the area requiring repair, if the area requiring repair is not linear, overlay the adhesive tape or sheet for covering sealing from above. May be affixed. Therefore, since it is necessary to follow the level | step difference of support body layer itself, the one where the adhesive layer is thicker is preferable.

  In addition, in the pressure-sensitive adhesive tape or sheet of the present invention, various additives can be added to the support layer, the pressure-sensitive adhesive layer, the primer, and the release liner, as necessary, as long as the purpose is not impaired. . Although not particularly limited, for example, hindered amine series, hindered phenol series, benzotriazole series, benzophenone series, benzoate series, triazine series, lactone series, phosphorus series, etc. Antioxidants such as phosphites, phosphonites, and thioethers, processing stabilizers such as metal soaps, organotins, and leads, surfactants, cationic and nonionic antistatics, synthetic silica , Silica-based anti-blocking agents, stearic acid, stearamide, calcium stearate, barium stearate, zinc stearate and other lubricants, calcium carbonate, magnesium carbonate, calcium, magnesium carbonate, silicic acid, silicate, aluminum water Japanese, Barium sulfate, Calcium sulfate , Calcium sulfite filler, benzine yellow, hansa yellow, resol red, alizarin lake, pigment scarlet 3B, brilliant carmine 6B, permanent red F-5R, permanent red 4R, rhodamine lake B, rhodamine lake Y, lake red C , Organic pigments such as Parared, Peacock Blue Lake, Phthalocyanine Blue, Aniline Black, Permanent Yellow HR, PV Violet BL, Quinacridone, Perinone, Anthraquinone, Chromoval Yellow 6G, Chromoval Yellow 3G, Chromoval Yellow GR, Titanium oxide, zinc white, litbon, lead white, cadmium yellow, yellow lead, titanium yellow, zinc chromate, ocher, chrome vermilion, red lip pigment, amber, yellow iron oxide, red acid Iron, cadmium red, red lead, Prussian blue, ultramarine blue, cobalt blue, chromium oxide green, mineral violet, carbon black, may be added as an additive for inorganic pigments of iron black and the like. Silicone-based, fluorine-based and long-chain alkyl-based release agents can be added as appropriate.

<Method for producing adhesive tape or sheet>
The support layer used in the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention is not particularly limited. For example, the support layer is formed by various methods such as extrusion molding, cast molding, stretching, or lamination of the molded product by lamination. Can be manufactured.

  Further, the pressure-sensitive adhesive layer used in the pressure-sensitive adhesive tape or sheet for coating sealing of the present invention is not particularly limited. For example, “a solvent-based pressure-sensitive adhesive dissolved in an organic solvent, an emulsion pressure-sensitive adhesive dispersed in water, etc. `` Apply on the support layer in the state and increase the viscosity by drying '', `` Apply a solvent-free adhesive on the support layer in a state where the viscosity is reduced by heating, increase the viscosity by cooling '', `` In addition to forming the pressure-sensitive adhesive layer by coating on the support layer with a low viscosity immediately after mixing the two liquids and increasing the viscosity by reaction, etc. Can be produced by various methods such as “multi-layer coextrusion molding in a lowered state”.

<Usage of adhesive tape or sheet>
The adhesive tape or sheet for covering sealing of the present invention described above can be applied without limitation on the type of repair material and the object to be adhered in the repair method using the low pressure injection method. Specific examples of suitable application conditions of the adhesive tape or sheet for covering sealing of the present invention include a repair material as an epoxy resin repair material, and a repair environment of 5 ° C. or higher suitable for an epoxy resin repair material. Applying a smooth concrete surface with no powder or the like as a repair target (deposition target), etc. In addition, repair of the crack of a structure, a dent, etc. by a low-pressure injection construction method can be performed by the following procedures 1-5 by using the adhesive tape or sheet | seat for coating sealing of the above this invention, for example. The working time required for the series of steps is about 25 hours (spring to autumn) to 49 hours (winter).
Procedure 1: Apply the adhesive tape or sheet for covering sealing of the present invention in a state of covering the surface of the repair-required portion {see Fig. 3 (a)} {see Fig. 3 (b) and Fig. 3 (c)}.
Procedure 2: A through hole for injecting a repair material is opened at an arbitrary position on the surface of the adhesive tape or sheet for covering sealing of the present invention attached in Procedure 1.
Step 3: Place the inlet part on the through hole opened in Step 2 while maintaining the through hole, and fix it with an adhesive with a short curing time {FIGS. 4 (a) and 4 (b) )reference}. The adhesive is the same as that used in place of the coating sealant described in the background art, and is cured in about one hour after application.
Step 4: A dedicated instrument that can be injected under pressure is set in the through-hole of the inlet part that has been placed and fixed in Step 3, and a repair material is injected and filled in a repair-required portion {see FIG. 5 (a)}.
Procedure 5: After the repair material has hardened, remove the pressure injection dedicated device {see Fig. 5 (b)}, and repair the adhesive tape or sheet for covering sealing with the inlet part still on the surface. It peels and removes from a location {refer to Drawing 6 (a) and Drawing 6 (b)}.

  Here, in the conventional pressure-sensitive adhesive tape or sheet for coating sealing, the thicker the support and the pressure-sensitive adhesive layer, the higher the material cost and the longer the time required for the pressure-sensitive adhesive coating process. Or the manufacturing cost of the sheet is quite high. For this reason, the selling price of the product may become high. The reason why the adhesive tape or sheet for covering sealing is not popular in the market is considered to be due to problems in terms of not only workability but also such price. According to the pressure-sensitive adhesive tape or sheet for covering sealing according to the present invention, the workability desired in a work environment of 5 to 40 ° C. is obtained by specifying the structure and / or material required for the base material and the pressure-sensitive adhesive. It is also possible to suppress the manufacturing cost and promote the spread to the market.

  Examples of the present invention will be specifically described below, but the present invention is not limited to these examples.

<Contents and production methods of constituent materials>
The contents of the constituent materials used and the production method are as follows.

(1) Support (base material)
Tables 2 and 3 show the types of base materials, Young's modulus of the base materials, and base material thickness (average thickness) used in this example. In addition, the Young's modulus of the base materials shown in Tables 2 and 3 show the measurement results in an environment of 20 ° C. and 65% RH. It was confirmed that it was 5 GPa or more).
(2) Adhesive The following were prepared as an adhesive main component and additive components.
Quintac 3270 (Styrene isoprene block copolymer manufactured by Nippon Zeon Co., Ltd.)
Quinton G100B (Nippon Zeon Corporation aliphatic hydrocarbon resin)
Quintac 3450 (Styrene isoprene block copolymer manufactured by Nippon Zeon Co., Ltd.)
Imabe S-100 (hydrogenated petroleum resin manufactured by Idemitsu Kosan Co., Ltd.)
HV-300 (polybutene manufactured by JX Nippon Oil & Energy Corporation)
NS-100 (Calcium carbonate manufactured by Nitto Flour Industry Co., Ltd.)
Antage W500 (Phenol-based anti-aging agent manufactured by Kawaguchi Chemical Industry Co., Ltd.)
Tinuvin P (benzotriazole-based UV absorber manufactured by BASF Japan Ltd.)
Tinuvin PA144 (Hindered amine light stabilizer manufactured by BASF Japan Ltd.)
Clearon M105 (Yasuhara Chemical Co., Ltd. aromatic modified terpene resin hydride)
YS Resin LP (Yasuhara Chemical Co., Ltd. liquid terpene resin)
Moreover, SK dyne 1717DT (made by Soken Chemical Co., Ltd.) and SK dyne 801BT (made by Soken Chemical Co., Ltd.) were prepared as acrylic adhesives. Quintac, Quinton, Imabe, Antage, Tinuvin, Clearon, and SK Dyne are registered trademarks.

  Next, each material is blended as shown in Table 1, dissolved in a solvent (toluene), and directly applied to a support layer with a primer by an applicator, for coating sealing according to Examples and Comparative Examples An adhesive tape or sheet was prepared. The coating thickness (average thickness) of the pressure-sensitive adhesive is as shown in Tables 2 and 3.

  In addition, as reference example 1 of the prior art, peel seal ONE (trade name, manufactured by Konishi Co., Ltd.) is shown in Table 3, and as quick reference example 2, quick mender (registered trademark, manufactured by Konishi Co., Ltd.) is shown in Table 3. In Reference Example 1, the curing time before injection of the repair material was as long as 48 hours, and the injection pressure test under severe conditions failed. In Reference Example 2, although the curing time was relatively short, it was peeled off with a spatula or the like and required to be ground with a grinder, so that the peelability was not good.

<Test method>
[Concrete peel test method]
The pressure-sensitive adhesive tape to be measured is cut to 10 mm width × 150 mm, and (1) temperature 5 ° C., humidity 40%, (2) temperature 23 ° C., humidity 50%, (3 ) Two reciprocating rollers are pressure-bonded at a speed of 600 mm / min using a pressure-bonding roller having a mass of 2 kg in an environment of a temperature of 40 ° C. and a humidity of 40%. The sample is allowed to stand for 30 minutes or 24 hours in each environment, and a 90 ° peel test is performed. The peeling speed at the time of measurement is 300 mm / min. In addition, the adhesive tape to be measured and the mortar panel using the # 180 polished ISO standard sand as the adherend should be left standing in each environment for at least 24 hours.

(Evaluation criteria for concrete peel test)
When the tape is peeled off after 30 minutes, those having an adhesive strength of 3 N / 10 mm or more in a working environment of 5 to 40 ° C. are judged as having good adhesion (◯), and those having an adhesive strength of less than 3 N / 10 mm are not suitable (×). It was determined. In addition, when the tape is peeled off after 24 hours, an adhesive strength of 20 N / 10 mm or less is judged as good peelability (◯) in a working environment of 5 to 40 ° C., and 15 N / 10 mm or less is better than peelability ( A) and those larger than 20 N / 10 mm were determined to be difficult to peel (x).

[Repairing material pressure-sensitive adhesive test method]
An epoxy repair material before curing is applied with a thickness of 1 mm on a silicone-treated PET film using an applicator, and the adhesive surface of the adhesive tape to be measured is stuck on the epoxy repair material before curing from above. At this time, be careful not to let air bubbles get in. After 24 hours, it is confirmed that the epoxy repair material has been cured, and the cured epoxy repair material is peeled off from the PET film and cut into 10 mm width × 150 mm. This is peeled off into a T shape (see FIG. 7), and the residue of the adhesive on the cured epoxy repair material at that time is evaluated. The peeling speed at the time of measurement is 300 mm / min.

(Repair material adhesive evaluation criteria)
An epoxy resin repair material having no adhesive residue was judged as ◯, and an adhesive resin residue was judged as x.

[Injection pressure test method]
Use four mortar panels using # 180 polished ISO standard sand (10 × 40 × 120 mm, of which 40 × 120 mm is the only one that is # 180 polished). The surfaces of 10 × 40 mm are bonded to each other using Quick Mender (registered trademark) manufactured by Konishi Co., Ltd. At this time, the # 180 polished surfaces are set in the same direction. Two sets of them are prepared, and a 10 × 240 mm surface is opened by 0.5 mm (a gap simulating a crack). Here, all the surroundings except the # 180 polished surface are cured so that the # 180 polished surfaces are in the same direction. Short adhesive: Sealed with Quick Mender (registered trademark) manufactured by Konishi Co., Ltd. At this time, the adhesive enters 1 mm into the panel. Therefore, the volume of the dent imitating a crack is 0.5 mm wide × 238 mm long × 9 mm deep. This is a cracked panel for severe testing. It sticks on this cracked panel for severe tests so that a dent may be covered with the adhesive tape or sheet | seat for covering sealing. A hole is made in this with a cutter etc., an injection port part is attached, and it fixes with an adhesive with a short hardening time: KONISHI Co., Ltd. make, Quick Mender (trademark). After 30 minutes, set up a special tool (cylinder) that can be pressurized and inject the epoxy-based repair material by hooking the pressure rubber onto the cylinder (Fig. 8).

(Injection pressure calculation method)
For example, when 40 mL of repair material is loaded in the cylinder, the pressure rubber is stretched by about 170 mm. The rubber force at that time is measured only with a spring. When applying a plurality of rubbers, the total pressure of the rubber is divided by the cross-sectional area of the piston to obtain the calculated pressure. From Pascal's principle, this pressure becomes the injection pressure to the tape. The injection pressure test conditions of the example and the comparative example are two pressure rubbers, a repair material amount of 40 mL, and a calculated pressure of 0.12 MPa.

(Injection pressure test evaluation criteria)
The case where the repair material injected from the end of the tape did not overflow or the tape did not rise was judged as “good”, and the case where the repair material overflowed or the tape was raised was judged as “poor”.

  The evaluation results in the above test are shown in Tables 2 and 3. Regarding Example 1, when a biaxially stretched PET film having a thickness of 75 μm was used for the support layer and an adhesive tape coated with 100 μm of adhesive A in Table 1 was used for the adhesive layer, all results were satisfactory. It was. About Examples 2-4, although the thickness of a support body layer and the thickness of an adhesive layer were changed from Example 1, all were also a favorable result here. An OPP film was used in Example 5 and a CPP film was used in Example 6. Although the kind and thickness of the support layer were changed from Example 2, these were also good results. In Examples 7 to 8, the pressure-sensitive adhesives C, D and G shown in Table 1 were used, but there was no problem even if the contents of the tackifier resin and the softener were changed within a certain range.

  In Comparative Example 1, the average thickness of the support layer was less than 60 μm, and the injection pressure resistance was rejected. In Comparative Examples 2 and 3, the pressure-sensitive adhesive layer was thick, and the adhesive strength in an environment at 5 ° C. after 24 hours of pasting exceeded 20 N / 10 mm, and therefore failed. For this reason, in Comparative Example 3, the injection pressure resistance test was omitted. In Comparative Example 4, the average thickness of the support layer was less than 60 μm, and the injection pressure resistance was rejected. For this reason, measurement of adhesive strength and evaluation of residual adhesive for repairing materials were omitted. In Comparative Examples 5 to 7, the Young's modulus of the support layer in an environment of 5 to 40 ° C was less than 0.5 GPa, and the injection pressure resistance was rejected. For this reason, measurement of adhesive strength and evaluation of residual adhesive for repairing materials were omitted. Since the comparative example 8 used the acrylic adhesive for the adhesive layer, it failed by the repair material adhesive residual evaluation. For this reason, the measurement of adhesive force and the injection pressure resistance test were omitted. Since Comparative Example 9 used the adhesive B in Table 1, the content of the tackifying resin was small, and the adhesive strength in an environment of 5 ° C., 23 ° C. and 40 ° C. after 30 minutes of application was less than 3 N / 10 mm. The injection pressure resistance was rejected. Since Comparative Example 10 used the adhesive E in Table 1, the content of the tackifying resin was large, and the adhesive strength in an environment at 5 ° C. after 30 minutes of application was less than 3 N / 10 mm, which was unsatisfactory in the injection pressure resistance test. Since it passed from the comparative example 9 that it will pass, it was set as the failure. Since Comparative Example 11 used the adhesive F in Table 1, the content of the softening agent was small, and the adhesive strength in an environment at 5 ° C. after 30 minutes of application was less than 3 N / 10 mm, which failed the injection pressure resistance test. Since it was estimated from Comparative Example 9, In Comparative Example 12, since the adhesive H in Table 1 was used, the content of the softening agent was large, and the repairing material adhesive residual evaluation was rejected. For this reason, the injection pressure resistance test was omitted.

Claims (4)

At least a support layer and a pressure-sensitive adhesive layer are included, the average thickness of the support layer is 60 to 200 μm, and the Young's modulus in an environment of 5 to 40 ° C. of the support layer is 0.5 GPa or more. Calculated based on the method, (1) 5 ° C., (2) 23 ° C., and (3) 40 ° C. adhesive strength at 30 ° C. after application is 3 N / 10 mm or more, and 24 hours after application (1) 5 ° C, (2) 23 ° C, and (3) Adhesive strength under an environment of 40 ° C is 20N / 10mm or less. Used for repairing cracks, dents, etc. in structures. Adhesive tape or sheet for covering sealing.
(Test method)
Cut the pressure-sensitive adhesive tape or sheet to be measured into 10 mm width × 150 mm, and use a # 180 polished ISO standard sand mortar panel, the temperature is (1) 5 ° C., (2) 23 ° C. or (3) 40 ° C. And, in an environment where the humidity is 40 to 50% RH, two reciprocating rollers are pressure-bonded at a speed of 600 mm / min using a pressure roller having a mass of 2 kg. Then, in each environment, it is left still for a predetermined time and a 90 degree peeling test is performed. The peeling speed at the time of measurement is 300 mm / min, and the adhesive tape to be measured and the mortar panel using the # 180 polished ISO standard sand which is the adherend are used after being allowed to stand for 24 hours or more in each environment. To do.   The pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive containing a styrene elastomer and a tackifier resin, and contains 40 to 120 parts by weight of the tackifier resin with respect to 100 parts by weight of the styrene elastomer. The pressure-sensitive adhesive tape or sheet for covering sealing according to claim 1.   The pressure-sensitive adhesive layer is a rubber-based pressure-sensitive adhesive containing a styrene elastomer and a softening agent, and contains 20 to 60 parts by weight of the softening agent with respect to 100 parts by weight of the styrene-based elastomer. The pressure-sensitive adhesive tape or sheet for covering sealing according to claim 1 or 2. A pressure-sensitive adhesive tape or sheet for covering sealing comprising at least a support layer and a pressure-sensitive adhesive layer;
The support layer has an average thickness of 60 μm to 200 μm and a Young's modulus in an environment of 5 to 40 ° C. of 0.5 GPa or more. The pressure-sensitive adhesive layer includes a styrene elastomer, a tackifier resin, and a tackifier resin. A rubber-based pressure-sensitive adhesive containing a softening agent, containing 40 to 120 parts by weight of a tackifying resin with respect to 100 parts by weight of the styrene-based elastomer, and softening with respect to 100 parts by weight of the styrene-based elastomer A pressure-sensitive adhesive tape or sheet for covering sealing used for repairing cracks, dents and the like of structures, which contains 20 to 60 parts by weight of an agent.

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