Reinforcing adhesive sheet, winding body thereof, method for repairing wind power generation blade, and wind power generation blade

Abstract

To provide a reinforcing adhesive sheet having superior sand resistance, a winding body of the reinforcing adhesive sheet, a method for repairing a wind power generation blade, and a wind power generation blade.SOLUTION: The present invention provides a reinforcing adhesive sheet used for reinforcement, the reinforcing adhesive sheet including a laminate in which a base material layer and an adhesive layer are laminated, wherein the Shore A hardness of the base material layer is 80 or more and 100 or less, and the base material layer satisfies at least one of the following physical properties A and B. Physical property A: a loss modulus of 1 MPa or more. Physical property B: a tear strength of 50 N / mm or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a reinforcing adhesive sheet and a roll thereof, a method for repairing a wind power generator blade, and a wind power generator blade. [Background technology]

[0002] Adhesive sheets are highly valuable materials that are widely used for a variety of purposes, including surface protection, repair, and joining. One known use of adhesive sheets is as a reinforcing adhesive sheet, which is used to reinforce transportation vehicles such as automobiles and aircraft, components of energy generating devices such as wind power generation blades, and plant equipment such as turbines. In particular, adhesive sheets are applied to wind power generation blades and the like that are installed outdoors for the purpose of protecting the surface from deterioration (erosion) and scratches, or for repair purposes.

[0003] Generally, adhesive sheets have a laminated structure in which an adhesive layer is laminated on a base layer, and are applied by attaching the adhesive layer side to the target area. For example, when performing repair work using an adhesive sheet, the adhesive layer side of the adhesive sheet is attached to the area to be repaired. Patent Document 1 discloses a technology that allows easy repair of scratches by adhering a laminated protective sheet having an adhesive layer, an intermediate fabric layer, and a durable surface layer to at least a portion of at least the leading edge of an FRP wing body main body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2012 / 102294 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, reinforcing adhesive sheets are often applied to wind power generation blades, aircraft propellers, plant equipment, and other objects exposed to outdoor environments. For this reason, reinforcing adhesive sheets applied for reinforcement or repair purposes can deteriorate over time, and are not necessarily capable of reinforcing the target area for an extended period of time.

[0006]

[0003] In particular, depending on the environment in which a reinforcing adhesive sheet is applied, sand or the like may collide with the adhesive sheet due to wind force, etc., causing wear and deterioration of the adhesive sheet. Therefore, there has been a need for a reinforcing adhesive sheet that is resistant to wear over a long period of time even when sand or the like collide with the reinforcing adhesive sheet, i.e., a reinforcing adhesive sheet that is resistant to sand erosion and has excellent sand resistance. In this regard, for example, improving the hardness of the adhesive sheet surface is considered, but the inventors' investigations have shown that simply increasing the hardness does not necessarily prevent deterioration due to sand erosion.

[0007] The present invention has been made in view of the above, and aims to provide a reinforcing adhesive sheet that has excellent sand resistance. It also aims to provide a roll of the reinforcing adhesive sheet, a method for repairing wind power generation blades, and wind power generation blades. [Means for solving the problem]

[0008] As a result of extensive research to achieve the above-mentioned objective, the inventors discovered that the above-mentioned objective can be achieved by forming a substrate layer and an adhesive layer and employing a substrate layer having specific physical properties, and thus completed the present invention.

[0009] That is, the present invention includes, for example, the subject matter described in the following sections. Item 1 A reinforcing adhesive sheet, A laminate in which a base layer and an adhesive layer are laminated, The base layer has a Shore A hardness of 80 or more and 100 or less, The substrate layer has at least one of the following physical properties A and B: Physical property A: Loss modulus is 1 MPa or more. Physical property B: Tear strength is 50N / mm or more, A reinforcing adhesive sheet that meets the requirements. Section 2 Item 2. The adhesive sheet for reinforcement according to Item 1, wherein the glass transition temperature of the base layer is −20° C. or higher and 20° C. or lower. Section 3 Item 3. The reinforcing adhesive sheet according to item 1 or 2, wherein the base layer contains at least one resin selected from the group consisting of urethane resin, urea resin, polyethylene terephthalate resin, vinyl chloride resin, vinyl acetate resin, acrylic resin, and polybutylene terephthalate resin. Section 4 Item 4. A wound body in which the adhesive sheet for reinforcing according to any one of items 1 to 3 is wound around a cylindrical core material. Section 5 A method for repairing a wind power generation blade using the reinforcing adhesive sheet according to any one of items 1 to 3, A method for repairing a wind power generation blade, comprising a step R of attaching the reinforcing adhesive sheet to a portion of the wind power generation blade to be repaired. Section 6 Item 6. The method for repairing a wind power generation blade according to Item 5, further comprising, before step R, step A of peeling off the deteriorated reinforcing adhesive sheet attached to the wind power generation blade. Section 7 Item 4. A wind power generation blade comprising the reinforcing adhesive sheet according to any one of items 1 to 3. [Effects of the Invention]

[0010] The reinforcing adhesive sheet of the present invention has excellent sand resistance. DETAILED DESCRIPTION OF THE INVENTION

[0011]

[0023] In the present specification, the terms "contain" and "comprise" include the concepts of "contain," "comprise," "consist essentially of," and "consist only of."

[0012] 1. Reinforcement adhesive sheet The reinforcing adhesive sheet of the present invention is an adhesive sheet used for reinforcement, and includes a laminate in which a base layer and an adhesive layer are laminated, and the base layer has a Shore A hardness of 80 or more and 100 or less. Furthermore, the base layer satisfies at least one of the following physical properties A and B. Physical property A: Loss modulus is 1 MPa or more. Physical property B: Tear strength is 50N / mm or more. Therefore, the reinforcing adhesive sheet encompassed by the present invention is as follows.

[0013] That is, one embodiment of the reinforcing adhesive sheet of the present invention comprises a laminate in which a base material layer and an adhesive layer are laminated, and the Shore A of the base material layer is 80 or more and 100 or less, and the base material layer satisfies the physical property A.

[0014] In addition, another embodiment of the reinforcing adhesive sheet of the present invention includes a laminate in which a base material layer and an adhesive layer are laminated, and the Shore A of the base material layer is 80 or more and 100 or less, and the base material layer satisfies the physical property B.

[0015] Furthermore, in yet another embodiment of the reinforcing adhesive sheet of the present invention, the sheet comprises a laminate in which a base material layer and an adhesive layer are laminated, and the Shore A of the base material layer is 80 or more and 100 or less, and the base material layer satisfies both the physical property A and the physical property B.

[0016] The reinforcing adhesive sheet of the present invention may be in any of the above embodiments.

[0017] The reinforcing adhesive sheet of the present invention has excellent sand resistance due to the laminate formed by laminating the above-mentioned substrate layer and adhesive layer. That is, the reinforcing adhesive sheet of the present invention is resistant to wear and exhibits little thickness loss even when struck by sand or the like, and has excellent sand erosion resistance. Therefore, the reinforcing adhesive sheet of the present invention can reinforce a target area for a long period of time, even when attached to the target area in an environment where sand may strike the target area.

[0018] The reinforcing adhesive sheet of the present invention comprises, as an essential component, a laminate in which a base layer and an adhesive layer are laminated.

[0019] (base material layer) The substrate layer is a layer that serves as a substrate for supporting the adhesive layer in the reinforcing adhesive sheet of the present invention.

[0020] [Shore A of base layer] The base layer has a Shore A hardness of 80 or more and 100 or less. This provides the reinforcing adhesive sheet of the present invention with excellent sand resistance. If the Shore A hardness of the base layer is less than 80, the base layer will be too soft and will have reduced sand resistance. However, if the base layer is too hard, its impact absorption ability will be weakened and it will be more susceptible to scratches due to impacts, etc., which may result in reduced sand resistance. In other words, the sand resistance of the reinforcing adhesive sheet will not be sufficient if the hardness is increased alone.

[0021] In order to facilitate further improvement of sand resistance, the Shore A is preferably 98 or less, more preferably 96 or less, and even more preferably 95 or less.

[0022] The Shore A hardness of the substrate layer can be measured, for example, using a commercially available Shore A hardness tester. In the present invention, the Shore A hardness of the substrate layer can be measured, for example, using a GS-719N Type A manufactured by Teclock Corporation. The Shore A hardness of the substrate layer may be measured in the state of a reinforcing adhesive sheet. In this case, the Shore A hardness of the substrate layer can be measured by measuring the surface on the substrate layer side with a Shore A hardness tester. In the present invention, the Shore A hardness of the substrate layer more specifically means the Shore A value measured from the surface of the substrate layer (the surface opposite the adhesive layer).

[0023] The method for adjusting the Shore A of the base material layer is not particularly limited. For example, the Shore A of the base material layer can be adjusted by setting the type of material constituting the base material layer, particularly the type and glass transition temperature of the resin forming the base material layer, the thickness of the base material layer, etc.

[0024] [Physical Properties A and B] Property A is a "loss modulus of 1 MPa or more," and property B is a "tear strength of 50 N / mm or more." When the base layer satisfies at least one of property A and property B, the reinforcing adhesive sheet of the present invention will have excellent sand resistance. Conversely, when the base layer does not satisfy either property A or property B, the reinforcing adhesive sheet of the present invention will not have the desired sand resistance and will be prone to sand erosion.

[0025] When the base material layer satisfies both property A and property B, the reinforcing adhesive sheet of the present invention exhibits particularly improved sand resistance.

[0026] The loss modulus defined in property A means the loss modulus at 20°C. The loss modulus of the base layer at 20°C can be measured, for example, using a known dynamic viscoelasticity measuring device, such as the polymer dynamic viscoelasticity measuring device "itkDVA-200" manufactured by IT Measurement Control Co., Ltd. The measurement conditions can be set to "tensile mode," with a heating rate of 10°C / min, a measurement temperature range of -40 to 50°C, a set strain of 0.02%, and a vibration frequency of 10 Hz.

[0027] When the substrate layer satisfies the physical property A, the loss modulus is preferably 1.1 MPa or more, more preferably 1.2 MPa or more, even more preferably 1.4 MPa or more, and particularly preferably 1.5 MPa or more. When the substrate layer satisfies the physical property A, the loss modulus is preferably 100 MPa or less, more preferably 70 MPa or less, even more preferably 60 MPa or less, and particularly preferably 50 MPa or less.

[0028] The method for adjusting the loss modulus of the substrate layer is not particularly limited. For example, the loss modulus of the substrate layer can be adjusted by setting the type of material constituting the substrate layer, particularly the type of resin forming the substrate layer, the average molecular weight, molecular weight distribution and glass transition temperature, the thickness of the substrate layer, etc.

[0029] The tear strength defined in property B can be measured, for example, according to the tear test method of JIS K-7311. In this measurement, for example, Tensilon manufactured by A&D Co., Ltd. can be used to measure the tear strength.

[0030] When the base layer satisfies the physical property B, the tear strength is preferably 52 N / mm or more, more preferably 54 N / mm or more, even more preferably 55 N / mm or more, and particularly preferably 56 N / mm or more. When the base layer satisfies the physical property B, the tear strength is preferably 150 N / mm or less, more preferably 140 N / mm or less, even more preferably 120 N / mm or less, and particularly preferably 100 N / mm or less.

[0031] The method for adjusting the tear strength of the substrate layer is not particularly limited. For example, the tear strength of the substrate layer can be adjusted by setting the type of material constituting the substrate layer, particularly the type, average molecular weight and glass transition temperature of the resin forming the substrate layer, the thickness of the substrate layer, etc.

[0032] The material for forming the base layer is not particularly limited in type, as long as it satisfies the above-mentioned Shore A and physical property A and / or physical property B.

[0033] The substrate layer is preferably formed from a resin, in which case the substrate layer is likely to have a Shore A hardness within the above-mentioned range and to satisfy the physical property A and / or the physical property B.

[0034] The base layer preferably contains at least one resin selected from the group consisting of urethane resin, urea resin, polyethylene terephthalate resin, vinyl chloride resin, vinyl acetate resin, acrylic resin, and polybutylene terephthalate resin. When the base layer is formed from such a resin, the reinforcing adhesive sheet of the present invention is likely to have improved sand resistance.

[0035] The base layer may also be formed from resins other than those mentioned above, such as polyimide, polyether ether ketone, polyetherimide, polyamideimide, polyphenylene sulfide, polycarbonate resin, polystyrene resin, polyethersulfone, acetate resin, and other olefin-based resins (polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer), and fluororesins such as polyvinylidene fluoride.

[0036] Among these, it is more preferable that the base layer be formed from a urethane resin, since when the base layer is formed from a urethane resin, the sand resistance of the reinforcing adhesive sheet is particularly improved.

[0037] The urethane resin may be, for example, a wide variety of polyurethanes obtained by reacting polyol with polyisocyanate.

[0038] Examples of polyols include polycarbonate polyols, polyester polyols, polyether polyols, and hydrocarbon polyols. Examples of polycarbonate polyols include reaction products of aliphatic or alicyclic polyols with carbonate derivatives such as carbonate esters and phosgene. Examples of aliphatic or alicyclic polyols include ethylene glycol, diethylene glycol, 1,4-butanediol, 1,3-butanediol, 2,3-butanediol, 1,3-propylene glycol, 1,2-propylene glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, and neopentyl glycol.

[0039] Examples of polyester polyols include esterified condensates obtained by reacting the above-mentioned aliphatic or alicyclic polyols with polycarboxylic acids. Examples of polycarboxylic acids include succinic acid, glutaric acid, adipic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, and tetrahydrofuran acid. Examples of polyether polyols include compounds obtained by addition polymerization of alkyne oxide with polyalkylene ether glycols such as polytetramethylene ether glycol (PTMG).

[0040] Examples of polyisocyanates include known aliphatic polyisocyanates, alicyclic polyisocyanates, and aromatic polyisocyanates.

[0041] Examples of aliphatic polyisocyanates include tetramethylene diisocyanate, dodecamethylene diisocyanate, hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, lysine diisocyanate, 2-methylpentane-1,5-diisocyanate, and 3-methylpentane-1,5-diisocyanate.

[0042] Examples of alicyclic polyisocyanates include isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate, methylenebis(4,1-cyclohexylene) diisocyanate (hydrogenated MDI), 1,4-cyclohexane diisocyanate, methylcyclohexylene diisocyanate, and 1,3-bis(isocyanatemethyl)cyclohexane.

[0043] Examples of aromatic polyisocyanates include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), 4,4'-dibenzyl diisocyanate, 1,5-naphthylene diisocyanate, xylylene diisocyanate (XDI), 1,3-phenylene diisocyanate, and 1,4-phenylene diisocyanate.

[0044] From the viewpoint of easily improving the sand resistance of the reinforcing adhesive sheet, the polyisocyanate is more preferably an aromatic polyisocyanate, and among these, diphenylmethane diisocyanate (MDI) is even more preferable.

[0045] In terms of ease of improving the sand resistance of the reinforcing adhesive sheet, the urethane resin is preferably a reaction product of polycarbonate polyol and polyisocyanate, more preferably a reaction product of polycarbonate polyol and aromatic polyisocyanate, and even more preferably a reaction product of polycarbonate polyol and diphenylmethane diisocyanate.

[0046] The substrate layer also preferably has a glass transition temperature of -20°C or higher and 20°C or lower. In particular, the substrate layer is preferably formed from a resin having a glass transition temperature of -20°C or higher and 20°C or lower. In this case, the substrate layer is likely to have a Shore A hardness in the above-mentioned range and is likely to satisfy physical property A and / or physical property B. Note that the types of resins having a glass transition temperature of -20°C or higher and 20°C or lower can also be exemplified by the various resins mentioned above, such as the urethane resins having a glass transition temperature of -20°C or higher and 20°C or lower.

[0047] The glass transition temperature of the substrate layer is more preferably −15° C. or higher, and is preferably 15° C. or lower.

[0048] The glass transition temperature of the substrate layer can be measured based on tan δ measured using a known dynamic viscoelasticity measuring device. For example, the glass transition temperature of the substrate layer can be measured using a polymer dynamic viscoelasticity measuring device "itkDVA-200" manufactured by IT Measurement Control Co., Ltd. The measurement conditions can be set to "tensile mode," with a temperature rise rate of 10°C / min, a measurement temperature range of -40 to 50°C, a set strain of 0.02%, and a vibration frequency of 10 Hz.

[0049] The substrate layer may contain other components in addition to resins, etc. Examples of other components include various components that can be contained in the substrate layer of known adhesive sheets, specifically light stabilizers, antioxidants, preservatives, fillers such as inorganic particles, flame retardants, pigments, colorants, mildew inhibitors, lubricants, etc. One or more of these additives may be contained in the substrate layer.

[0050] The substrate layer may have a single layer structure or a laminate structure in which two or more layers are laminated.

[0051] When the substrate layer has a laminated structure, for example, a structure containing a core material inside can be mentioned. Specifically, it can have a structure in which a core material is contained inside and both sides of the core material (intermediate layer) are covered with a surface layer. In this case, the core material and the surface layer may be a single layer, or may consist of two or more layers. When both are single layers, the substrate has a three-layer structure.

[0052] The core and surface layers can be formed of different materials, or can be formed of the same material. For example, the core and surface layers of the substrate layer may be formed of the above-mentioned urethane resin. In this case, the urethane resins of the core and surface layers may be the same or different. The urethane resin for forming the surface layer of the substrate layer is preferably a reaction product of polycarbonate polyol and polyisocyanate, more preferably a reaction product of polycarbonate polyol and aromatic polyisocyanate, and even more preferably a reaction product of polycarbonate polyol and diphenylmethane diisocyanate (MDI).

[0053] The shape of the substrate layer is not particularly limited, and can be an appropriate shape depending on the desired shape of the reinforcing adhesive sheet. Usually, the substrate is formed into a long length.

[0054] The thickness of the base layer is not particularly limited, and can be appropriately determined depending on the desired thickness of the reinforcing adhesive sheet and its intended use.For example, the thickness of the base layer is 20 μm or more and 4000 μm or less, preferably 100 μm or more and 2000 μm or less.Here, the thickness of the base layer refers to the overall thickness of the base layer, that is, when the base layer has the aforementioned laminated structure, it refers to the total thickness obtained by adding up the thicknesses of each layer.

[0055] The method for forming the substrate layer is not particularly limited, and for example, a substrate can be formed by the above-mentioned extrusion molding method, and this substrate can be used as the substrate layer of the adhesive sheet. Substrates such as commercially available products can also be used as the substrate layer. When the substrate layer has a laminated structure, for example, each layer (surface layer, core material, etc.) can be prepared and laminated by an appropriate method to obtain a substrate having a laminated structure.

[0056] (Adhesive layer) The adhesive layer is the surface that is attached to the object to be reinforced or repaired (for example, a wind power generation blade), and is the layer that imparts adhesive properties to the reinforcing adhesive sheet of the present invention.

[0057] The material for forming the adhesive layer is not particularly limited, and for example, a wide variety of known adhesive resins that are known to impart adhesive properties can be applied to the present invention. Examples of adhesive resins for forming the adhesive layer include acrylic resins, polyurethanes, polyolefins, polyesters, rubber-based resins, silicone-based resins, and vinyl acetate-based resins.

[0058] For example, when the adhesive layer is an acrylic resin, the acrylic resin may be an acrylic polymer having a (meth)acrylic acid ester unit. In this specification, "(meth)acrylic" means "acrylic" or "methacrylic". For example, "(meth)acrylate" means "acrylate" or "methacrylate".

[0059] Examples of (meth)acrylic acid esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, isopropyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, polyalkylene glycol mono(meth)acrylate, etc. The (meth)acrylic acid ester units contained in the acrylic polymer may be of one type or two or more types.

[0060] The glass transition temperature, resin composition, molecular weight, etc. of the resin for forming the adhesive layer are not particularly limited, and may be the same as those of known reinforcing adhesive sheets, for example.

[0061] The adhesive layer may have a single layer structure consisting of only one layer, or may have a laminated structure consisting of two or more layers. When the adhesive layer has a laminated structure, the number of layers included in the adhesive layer is not particularly limited, and the adhesive layer may have a two-layer structure or a multi-layer structure consisting of two or more layers. When the adhesive layer has a laminated structure consisting of two or more layers, the layers of the adhesive layer may be the same as each other, or at least one or all of the layers may be different.

[0062] The thickness of the adhesive layer is, for example, 10 μm to 700 μm, preferably 50 μm to 500 μm. The thickness of the adhesive layer means the overall thickness of the adhesive layer, that is, when the adhesive layer has the aforementioned laminated structure, it means the total thickness obtained by adding up the thicknesses of the individual layers.

[0063] The adhesive layer may contain other components in addition to the resin, for example, silane coupling agents, crosslinking agents, light stabilizers, antioxidants, preservatives, fillers such as inorganic particles, flame retardants, pigments, colorants, anti-fungal agents, etc., as needed.

[0064] The method for forming the adhesive layer is not particularly limited, and any known method can be widely adopted. For example, the adhesive layer can be formed using an adhesive composition containing a material for forming the adhesive layer. More specifically, the adhesive layer can be formed by applying the adhesive composition to a substrate. In this case, the substrate may be the substrate layer. The adhesive layer can also be commercially available; for example, the "Sekisui SJ" series from Sekisui Chemical Co., Ltd. can be used as the adhesive layer.

[0065] (Reinforcing adhesive sheet) The reinforcing adhesive sheet of the present invention includes a laminate in which a substrate layer and an adhesive layer are laminated. The laminate may consist of only the substrate layer and the adhesive layer, or may include other layers as long as the effects of the present invention are not impaired.

[0066] As other layers, for example, a release layer may be provided to protect at least one of the adhesive layer and the base layer of the reinforcing adhesive sheet. Examples of substrates on which the release layer is formed include polyolefin resins such as polyethylene and polypropylene, and polyester resins such as polyethylene terephthalate. Examples of release agents for imparting release functionality to the release layer include a wide range of known release agents, such as silicone-based release agents and compounds containing long-chain alkyl groups. Release layers can also be obtained from commercially available products.

[0067] The reinforcing adhesive sheet of the present invention is a long sheet, and dimensions such as width and thickness are not particularly limited and can be set appropriately depending on the application.

[0068] The reinforcing adhesive sheet of the present invention can be in the form of a wound body (scroll shape). The form of such a wound body is not particularly limited, and for example, the wound body may be formed by winding the reinforcing adhesive sheet around a cylindrical core material. That is, the wound body is preferably formed by winding the reinforcing adhesive sheet of the present invention around a cylindrical core material. The type and size of the cylindrical core material in the wound body are also not particularly limited, and a wide range of known cylindrical core materials can be used.

[0069] The reinforcing adhesive sheet of the present invention can be used for a variety of purposes, and can reinforce or repair the area to be bonded.

[0070] In particular, because the reinforcing adhesive sheet of the present invention has excellent sand resistance, it can be suitably used for wind power generation blades, which have traditionally been prone to sand erosion problems. That is, the reinforcing adhesive sheet of the present invention is particularly suitable as an adhesive sheet for wind power generation blades, and is capable of protecting wind power generation blades over the long term. Therefore, wind power generation blades reinforced with the reinforcing adhesive sheet of the present invention can operate for long periods of time, requiring less frequent reinforcement and repair.

[0071] The type of wind power blade to which the reinforcing adhesive sheet of the present invention can be applied is not particularly limited, and examples thereof include a wide range of known wind power blades. The material of the wind power blade is also not particularly limited, and examples thereof include carbon fiber composite materials (CFRP), glass fiber composite materials, etc.

[0072] The reinforcing adhesive sheet of the present invention can be applied to applications other than wind power generation blades, and can be used in a wide variety of applications requiring reinforcement and repair. For example, the reinforcing adhesive sheet of the present invention can be used for automobile bodies, aircraft blades, propellers, fuselages, turbines for generators, etc.

[0073] 2. Wind turbine blade repair method The reinforcing adhesive sheet described above can be used to repair wind power generation blades. The method for repairing wind power generation blades is not particularly limited. Such a repair method can include, for example, a step R of attaching the reinforcing adhesive sheet of the present invention to the area of ​​the wind power generation blade to be repaired.

[0074] In step R, the method for attaching the adhesive sheet to the area to be repaired is not particularly limited. For example, the sheet may be attached directly by a person, or the attachment work may be performed by a robot or the like.

[0075] When repairing wind power blades, there are cases where another adhesive sheet (for example, the reinforcing adhesive sheet of the present invention) has already been attached to the object to be repaired. That is, there are cases where a deteriorated protective film has already been attached to the wind power blade. In this case, the deteriorated protective film (for example, the deteriorated reinforcing adhesive sheet of the present invention) is peeled off, and then a new adhesive sheet is attached to complete the repair.

[0076] Therefore, the method for repairing a wind power generation blade may include, before step R, step A of peeling off the deteriorated reinforcing adhesive sheet of the present invention that has already been attached to the wind power generation blade.

[0077] In step A, after the repair sheet has been peeled off, the repair area may be cleaned and primed as needed before a new reinforcing adhesive sheet is attached. The cleaning method and the primer treatment method are not particularly limited, and for example, a wide variety of known methods can be used.

[0078] In step A, if the deteriorated repair sheet is the reinforcing adhesive sheet of the present invention, as described above, the reinforcing adhesive sheet of the present invention can be easily peeled off with little adhesive residue, making repair work easier. Therefore, by using the reinforcing adhesive sheet of the present invention, repeated repair work can be performed easily and simply. If the deteriorated repair sheet is the reinforcing adhesive sheet of the present invention, the above-mentioned cleaning of the repair area can be omitted, and primer treatment can also be omitted.

[0079] In specifying the inventions included in the present disclosure, the components (properties, structures, functions, etc.) described in the embodiments of the present disclosure may be combined in any manner. In other words, the present disclosure includes all subject matter consisting of all combinations of the components that can be combined as described in this specification. [Example]

[0080] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0081] Example 1 A flat substrate layer with a thickness of 400 μm was formed using "E990" from Nippon Miractoran Co., Ltd., a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate, as the urethane resin. A 150 μm thick adhesive layer made of an acrylic resin manufactured by Soken Chemical & Engineering Co., Ltd. was formed on one side of this substrate layer. A laminate formed by the resulting substrate layer and adhesive layer was obtained as a reinforcing adhesive sheet.

[0082] Example 2 A reinforcing adhesive sheet was obtained in the same manner as in Example 1, except that the urethane resin, which is a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate, was changed to "E980" manufactured by Nippon Miractoran Co., Ltd.

[0083] Example 3 A reinforcing adhesive sheet was obtained in the same manner as in Example 1, except that the urethane resin, which is a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate, was changed to "E995" manufactured by Nippon Miractoran Co., Ltd.

[0084] Example 4 Urethane resin 1 was prepared using "E990" from Nihon Miractoran Co., Ltd., a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate. Urethane resin 2 was prepared using "XN2001" from Tosoh Corporation, a polyaddition product of polycarbonate polyol and hexamethylene diisocyanate (HDI). A core material was formed using urethane resin 2, and surface layers made of urethane resin 1 were laminated on both sides of the core material to obtain a substrate layer with a laminated structure. The overall thickness of the substrate layer was 400 μm. Next, a 150 μm thick adhesive layer made of an acrylic resin manufactured by Soken Chemical & Engineering Co., Ltd. was formed on one side of the substrate layer (the XN-2001 side). A laminate formed from the resulting substrate layer and adhesive layer was obtained as a reinforcing adhesive sheet.

[0085] Example 5 A reinforcing adhesive sheet was obtained in the same manner as in Example 1, except that the urethane resin was changed to "P1090" manufactured by BASF, which is a polyaddition product of polycaprolactone diol and special isocyanate.

[0086] (Comparative Example 1) A commercially available reinforcing adhesive sheet was used, which had a 50 μm thick adhesive layer made of acrylic resin formed on one side of a 300 μm thick urethane resin base layer.

[0087] (Comparative Example 2) Urethane resin 3 was prepared using BASF's "ET1090," a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate. Urethane resin 4 was prepared using Nippon Miractoran's "E670," a polyaddition product of polyethersulfone (PES) and diphenylmethane diisocyanate (MDI). A core was formed using urethane resin 3, and surface layers made of urethane resin 4 were laminated on both sides of the core to obtain a substrate layer with a laminated structure. The overall thickness of the substrate layer was 400 μm. Next, a 150 μm thick adhesive layer made of an acrylic resin manufactured by Soken Chemical & Engineering Co., Ltd. was formed on one side of the substrate layer (the E670 side). A laminate formed from the resulting substrate layer and adhesive layer was obtained as a reinforcing adhesive sheet.

[0088] (Comparative Example 3) A reinforcing adhesive sheet was obtained in the same manner as in Example 1, except that the urethane resin, which is a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate, was changed to "E670" from Nippon Miractoran Co., Ltd. (a urethane resin, which is a polyaddition product of polyethersulfone (PES) and diphenylmethane diisocyanate (MDI)).

[0089] Comparative Example 4 Urethane resin 1 was prepared using "E990" from Nippon Miractoran Co., Ltd., a polyaddition product of polycarbonate polyol and diphenylmethane diisocyanate. Urethane resin 4 was prepared using "E670" from Nippon Miractoran Co., Ltd., a polyaddition product of polyethersulfone (PES) and diphenylmethane diisocyanate (MDI). A core material was formed using urethane resin 3, and surface layers made of urethane resin 1 were laminated on both sides of the core material to obtain a substrate layer with a laminated structure. The overall thickness of the substrate layer was 400 μm. Next, a 150 μm-thick acrylic resin adhesive layer manufactured by Soken Chemical & Engineering Co., Ltd. was formed on one side of the substrate layer (the E670 side). A laminate formed from the resulting substrate layer and adhesive layer was obtained as a reinforcing adhesive sheet.

[0090] (Comparative Example 5) A reinforcing adhesive sheet was obtained in the same manner as in Example 1, except that the urethane resin was changed to "XN-2001" manufactured by Tosoh Corporation, which is a polyaddition product of polycarbonate polyol and hexamethylene diisocyanate (HDI).

[0091] (Evaluation method) <Sandblasting test (sand resistance)> For the sandblasting test, Fuji Manufacturing's "PNEUMA-BLASTER SGF-4(A)S type" (media: SiC#220, nozzle diameter Φ0.9mm) was used. The test conditions were as follows: ·Irradiation angle: 90° ·Irradiation amount: 120g / min ·Irradiation distance: 50mm ·Irradiation time: 150sec Irradiation pressure: 0.31 MPa The samples were prepared as follows. The adhesive surface of the reinforcing adhesive sheet obtained in each Example and Comparative Example was attached to a 2 mm thick GFRP plate that had been gel-coated on one side. This was used as a test specimen and subjected to sandblasting. The thickness of the center of the test specimen containing this GFRP plate was measured before and after sandblasting, and the difference between the measured values ​​was taken as the amount of thinning, which was evaluated according to the following criteria. ≪Judgment criteria≫ ◯: The difference in thickness before and after treatment was less than 100 μm, and the sand resistance was excellent. ×: The difference in thickness before and after treatment was 100 μm or more, and the sand resistance was poor.

[0092] <Shore A> The Shore A hardness of the base layer was measured by measuring the surface of the base layer using a GS-719N Type A manufactured by Teclock Corp. Evaluation samples were prepared by cutting each adhesive sheet into 5 cm x 5 cm pieces, and multiple cut sheets were stacked to form a laminate with a thickness of 1 cm or more, and the central part of the outermost surface of the laminate was measured.

[0093] <Loss modulus> The loss modulus at 20°C of the substrate layer used in each of the examples and comparative examples was measured under the following conditions using a polymer dynamic viscoelasticity measuring device "itkDVA-200" (manufactured by IT Measurement and Control Co., Ltd.). Measurement mode: Tensile mode Heating rate: 10℃ / min Measurement temperature range: -40 to 50°C Setting distortion: 0.02% Frequency: 10Hz

[0094] <Tear strength> The tear strength of the substrate was measured in accordance with the tear test method of JIS K-7311.

[0095] <Glass transition temperature> The glass transition temperature of the substrate layer used in each of the examples and comparative examples was measured based on tan δ measured under the following conditions using a polymer dynamic viscoelasticity measuring device "itkDVA-200" (manufactured by IT Measurement Control Co., Ltd.). Measurement mode: Tensile mode Heating rate: 10℃ / min Measurement temperature range: -40 to 50°C Setting distortion: 0.02% Frequency: 10Hz

[0096] Table 1 shows the structure of the base layer and the evaluation results of sand resistance for the reinforcing adhesive sheets obtained in each Example and Comparative Example. Note that the numbers in parentheses in the sand resistance evaluation column in Table 1 indicate the amount of thickness loss. Table 1 shows that the reinforcing adhesive sheets obtained in each Example have superior sand resistance compared to the reinforcing adhesive sheets obtained in the Comparative Examples.

[0097] [Table 1]

Claims

1. A reinforcing adhesive sheet, A laminate in which a base layer and an adhesive layer are laminated, The base layer has a Shore A of 80 or more and 100 or less, The substrate layer has at least one of the following physical properties A and B: Physical property A: Loss modulus is 1 MPa or more, Physical property B: Tear strength is 50 N / mm or more, A reinforcing adhesive sheet that meets the requirements.

2. 2. The reinforcing adhesive sheet according to claim 1, wherein the glass transition temperature of the substrate layer is −20° C. or higher and 20° C. or lower.

3. 2. The reinforcing adhesive sheet according to claim 1, wherein the base layer comprises at least one resin selected from the group consisting of urethane resin, urea resin, polyethylene terephthalate resin, vinyl chloride resin, vinyl acetate resin, acrylic resin, and polybutylene terephthalate resin.

4. A wound body in which the reinforcing adhesive sheet according to any one of claims 1 to 3 is wound around a cylindrical core material.

5. A method for repairing a wind power generation blade using the reinforcing adhesive sheet according to any one of claims 1 to 3, comprising: A method for repairing a wind power generation blade, comprising a step R of attaching the reinforcing adhesive sheet to a location of the wind power generation blade to be repaired.

6. The method for repairing a wind power generation blade according to claim 5 , further comprising, before step R, step A of peeling off the deteriorated reinforcing adhesive sheet that has been attached to the wind power generation blade.

7. A wind power generation blade comprising the reinforcing adhesive sheet according to any one of claims 1 to 3.

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