Method for curing coating film and sheet-like member

Abstract

To accelerate the curing of a coating film by suppressing the deterioration of the coating film due to ultraviolet rays during the curing of the coating film.SOLUTION: A method for curing a coating film applied to a structure, the method comprising a first step of temporarily fixing a sheet-like member made of a synthetic resin with a coating material of the coating film, and a second step of removing the sheet-like member temporarily fixed in the first step from the structure after a lapse of a predetermined curing period, wherein the sheet-like member is any of a woven fabric, a nonwoven fabric, a knitted fabric, and a film material having a plurality of holes, and has a lightness of 8 or less in the Munsell color system, the predetermined ultraviolet light shielding property is 7. when ultraviolet light having a wave length of 5cm is irradiated from a position away from 365nm toward the front face of the sheet-like member so as to have an integrated light amount of 800mJ / cm2, and an integrated light amount detected on the back face side of the sheet-like member is defined as an integrated light amount X, the sheet-like member satisfies an integrated light amount X ≤ 800 (mJ / cm2) * 2 / 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for curing a coating film and a sheet-like member used for the curing. [Background technology]

[0002] Adhesion methods, in which continuous fiber sheets are bonded to structures, are known as a method for reinforcing and repairing concrete structures. While this method has traditionally been applied mainly to tunnels and bridges, it is increasingly being applied to structures (such as chimneys) that are exposed to direct sunlight.

[0003] Primers and other coating materials applied to structures undergo surface deterioration when exposed to ultraviolet rays, and in winter they require extended curing times due to the effects of wind and other factors.

[0004] During curing, it is known that surface deterioration called amine blushing occurs due to moisture in the air, carbon dioxide, and amine-based curing agents often used in adhesives. To prevent this, various methods have been proposed for covering the coating surface with a sheet-like material (see, for example, Patent Document 1).

[0005] For example, Patent Document 2 discloses a method of curing an adhesive surface applied to a structure by covering the surface with a film having air vent holes formed in a non-breathable base material, thereby blocking moisture and carbon dioxide in the air and preventing the occurrence of amine blushing (whitening). However, because polyolefins such as polypropylene are transparent, ultraviolet light easily passes through them in environments exposed to direct sunlight, accelerating the deterioration of the adhesive resin.

[0006] Furthermore, Patent Document 3 discloses that polyester fibers have a high ultraviolet absorbing effect and that an ultraviolet absorber is blended into the fibers, but does not consider accelerating the curing of the coating film. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-235444 [Patent Document 2] Patent No. 7328468 [Patent Document 3] Patent No. 7153995 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to prevent deterioration of a coating film caused by ultraviolet rays during curing and to promote curing of the coating film. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a coating film curing method (1) that cures a coating film applied to a structure, comprising: a first step of temporarily fixing a synthetic resin sheet member with a coating material for the coating film; and a second step of removing the sheet member temporarily fixed in the first step from the structure after a predetermined curing period has elapsed, wherein the sheet member is any one of woven fabric, nonwoven fabric, knitted fabric, and film material having a plurality of holes, and is colored in any one of black, blue, green, and yellow having a value of 8 or less in the Munsell color system, and is irradiated with ultraviolet light having a wavelength of 365 nm from a position 7.5 cm away with an integrated light intensity of 800 mJ / cm. 2 When the integrated light amount X is defined as the integrated light amount detected on the back side of the sheet-like member when the light is irradiated toward the front surface of the sheet-like member so as to satisfy the following formula (1), the sheet-like member has ultraviolet shielding properties such that the integrated light amount X satisfies the following formula (1): Accumulated light intensity X≦800(mJ / cm 2 )×2 / 3...Equation (1)

[0010] (2) In the first step, the coating material is caused to flow from the back surface of the sheet-like member toward the front surface thereof, thereby covering at least a portion of the front surface of the sheet-like member with the coating material. The method for curing a coating film according to (1) above,

[0011] (3) The sheet-like member contains an ultraviolet absorber that converts absorbed ultraviolet rays into heat. 1. A method for curing a coating film according to claim 1 or 2.

[0012] (4) The method for maintaining a coating film according to (1) above, characterized in that the sheet-like member is any one of the woven fabric, the nonwoven fabric, and the knitted fabric, and has gaps that allow the coating material to enter.

[0013] (5) The method for curing a coating film according to (1) above, wherein the sheet-like member is the film material, and the holes allow the coating material to enter.

[0014] (6) A sheet-like member for curing a coating film applied to a structure, the sheet-like member being any one of woven fabric, nonwoven fabric, knitted fabric, and film material having a plurality of holes, and having a Munsell color system brightness of 8 or less, and capable of irradiating ultraviolet light with a wavelength of 365 nm from a position 7.5 cm away with an integrated light intensity of 800 mJ / cm 2 When the integrated light amount X is defined as the integrated light amount detected on the back side of the sheet-like member when the light is irradiated toward the front surface of the sheet-like member so as to satisfy the following formula (1), the sheet-like member has ultraviolet shielding properties such that the integrated light amount X satisfies the following formula (1): Accumulated light intensity X≦800(mJ / cm 2 )×2 / 3...Equation (1) [Effects of the Invention]

[0015] According to the present invention, when a coating material applied to a structure is cured, it can be protected by a sheet-like member with excellent ultraviolet blocking properties. This makes it possible to suppress deterioration of the coating material due to ultraviolet rays. Furthermore, the sheet-like member generates heat by absorbing sunlight, which promotes curing of the coating film. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a plan view of a sheet-like member (woven fabric). [Figure 2A] FIG. 2 is a plan view of a sheet-like member (film). [Figure 2B] 10A and 10B are explanatory diagrams for explaining a method of calculating the aperture ratio of circular hole arrangements of 60° staggered, 45° staggered, and parallel. [Figure 3] 1 is a process diagram (Steps I to IV) of a bonding step for bonding continuous fiber sheets. [Figure 4] 1 is a process diagram (Steps V to VIII) of a bonding step for bonding continuous fiber sheets. [Figure 5] 1 is a process diagram (Processes IX to XI) of a bonding process for bonding continuous fiber sheets. [Figure 6] 1 is a process diagram (steps XII to XIV) of a bonding step for bonding continuous fiber sheets. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the sheet-like member of the present invention will be described. The sheet-like member is used as a curing sheet for a coating film applied to a structure when a continuous fiber sheet is wrapped around the structure to repair, reinforce, or the like. The structure may be, for example, a concrete structure. The concrete structure may be a chimney, a bridge, a bridge pier, a base slab, a tunnel lining wall, a building, a utility pole, or the like. Furthermore, the structure is not limited to a concrete structure, and may be any structure to be reinforced or repaired, such as a metal structure (e.g., steel), a wooden structure, or an FRP structure.

[0018] The sheet-like member is any one of woven fabric, nonwoven fabric, knitted fabric, and film material, and has a predetermined ultraviolet blocking property described below. All of the sheet-like members are made of synthetic resin, and have gaps or holes that allow the penetration of a fluid and viscous coating material (before hardening) and the passage of gas. Figure 1 shows a schematic diagram of a sheet-like member 10 made of woven fabric, with the gaps indicated by the reference numeral 11.

[0019] Woven fabric is a fabric made by crossing warp and weft threads made of synthetic fibers, and weaving methods include plain weave, twill weave, and satin weave. Of these weaving methods, plain weave is preferred because the woven fabric is less likely to stretch and has excellent durability. Since repeated use of the sheet-like member 10 is expected, fabrics that have been treated with shape memory processing or shape stabilization processing to prevent curling can also be used preferably. Nonwoven fabrics are fabrics made by intertwining synthetic fibers without weaving them. A knitted fabric is made by forming loops with yarn and connecting these two-dimensionally. All of these woven fabrics, nonwoven fabrics and knitted fabrics have the above-mentioned gaps (gaps between fibers).

[0020] FIG. 2A schematically shows a sheet-like member 20 made of a film material, with the aforementioned holes indicated by the reference numeral 21. There are a plurality of holes 21. The periphery of each hole 21 is preferably flat. In other words, the height of the burrs formed around each hole 21 is preferably a predetermined value (1 mm) or less. By flattening the periphery of each hole 21, it is no longer necessary to distinguish between the front and back of the sheet-like member 20, and it is possible to prevent localized lifting due to the burrs. For example, when laser processing or the like is used as the perforation method, the periphery of each hole 21 is less susceptible to shear deformation, and can therefore be flattened.

[0021] As described above, the gaps 11 in the sheet-like member 10 and the holes 21 in the sheet-like member 20 allow the coating material to enter. Since the base material of the sheet-like member (film material) 20 does not have the property of allowing the coating material to pass through, the holes 21 are provided to allow the coating material to enter. Needless to say, the gaps 11 and holes 21 allow gas to pass through. In the following description, when there is no need to particularly distinguish between the sheet-like member 10 and the sheet-like member 20, they will be collectively referred to as "sheet-like member 10, etc." Furthermore, when there is no need to particularly distinguish between the gaps 11 and the holes 21, they will be collectively referred to as "gaps 11, etc."

[0022] "Infiltration" means that the coating material has entered the gaps 11, etc., and does not necessarily mean that the gaps 11, etc. are completely blocked by the coating material. In other words, "infiltration" can also include a state in which the coating material has entered the gaps 11, etc., while leaving some space therein. When part of the coating material has entered the gaps 11, etc., the sheet-like member 10, etc. can be temporarily fixed to the coating film of the structure. Furthermore, when the infiltrated coating material spreads along the surface of the sheet-like member 10, etc., a so-called anchor effect occurs, which can enhance the fixing effect. For example, a coating material with a thickness of approximately 200 μm is applied to a flat glass plate, and a sheet-like member 10 or the like is placed on the coated surface and rubbed with a spatula. At this time, if it can be visually confirmed that the coating material has reached the front surface from the back surface of the sheet-like member 10 or the like, if a color change in the sheet-like member 10 or the like is confirmed, or if the transfer of gaps 11 or holes 21 to the coated surface is confirmed when the sheet-like member 10 or the like is peeled off, it can be evaluated as "penetration."

[0023] The gaps 11 etc. also function as air vents when temporarily fixing the sheet-like member 10 etc. The reason for using the expression "temporarily fixing" is that the sheet-like member 10 etc. will be removed after curing.

[0024] The peel strength when removing the sheet-like member 10 or the like from the structure 100 is preferably 10 N / cm or less, more preferably 8 N / cm or less, and even more preferably 5 N / cm or less. The peel strength may be the maximum tension measured when the sheet-like member 10 or the like is adhered to a structure according to an actual construction method, cut every 20 mm, and then a tension meter is attached to the starting point and a manual peel test is performed at a 45-degree angle. The peel strength is adjusted depending on the material used for the sheet-like member 10 or the like.

[0025] Furthermore, it is preferable that the sheet-like member 10 etc. be peelable with a strength equal to or less than the tear strength of the sheet-like member 10 etc. The tear strength is measured by a tensile test specified in JIS L 1096 A-1 method.

[0026] The arrangement pattern of the holes 21 in the sheet-like member (film material) 20 is not particularly limited, but examples include a 60° staggered pattern, a 45° staggered pattern, and a parallel pattern. The shape of the holes 21 is also not particularly limited, but examples include a circle, an ellipse, an oblong hole, a polygon (such as a square, a rectangle, or a hexagon), or a notched shape. However, in consideration of ease of processing, square and circle shapes are preferred, and circle shapes are most preferred.

[0027] The hole size (diameter) D of the holes 21 is preferably 0.05 mm or more and 1.5 mm or less, more preferably 0.1 mm or more and 1.0 mm or less, and even more preferably 0.2 mm or more and 0.5 mm or less. If the shape of the holes 21 is not circular, the hole size D may be the equivalent circle diameter. If the hole size D is too small, the penetration of the coating material is hindered. If the hole size D is too large, the UV blocking effect may be reduced and water may easily penetrate to the back surface of the sheet-like member 20, which may promote denaturation of the coating film.

[0028] The aperture ratio of the holes 21 is preferably 0.01% or more and 10.0% or less, more preferably 0.05% or more and 7.5% or less, and even more preferably 0.1% or more and 5.0% or less. The method of calculating the aperture ratio is common technical knowledge and does not require detailed explanation, but the method of calculating the aperture ratio in the case of a 60° staggered, 45° staggered, and parallel circular hole arrangement will be described with reference to FIG. 2B. When the pitch of the holes 21 is P, the aperture ratio in the case of a 60° staggered arrangement is 90.6×D 2 ÷P 2 The aperture ratio is calculated by (see Figure 2B(a)), and for the 45° staggered pattern, it is 157 × D 2 ÷P 2 The aperture ratio is calculated as follows (see Figure 2B(b)), and for the parallel type it is 78.5 × D 2 ÷P 2 The aperture ratio is calculated by (see FIG. 2B(c)).

[0029] If the opening ratio is too large, the surface area in contact with the atmosphere increases, reducing the effectiveness of suppressing amine blushing.If the opening ratio is too small, it becomes difficult to bleed air, which can lead to problems such as the formation of unevenness due to air pockets and the accumulation of rainwater.

[0030] The predetermined ultraviolet shielding property of the sheet-shaped member 10 or the like can be defined by the cumulative amount of light transmitted through the sheet-shaped member 10 or the like, as will be explained below. When ultraviolet light with a wavelength of 365 nm is irradiated from a position 7.5 cm away, the cumulative amount of light is 800 mJ / cm. 2 When light is irradiated onto the surface of the sheet-like member 10 or the like so as to satisfy the following formula (1), the integrated light amount detected on the back side of the sheet-like member 10 or the like is defined as integrated light amount X. The sheet-like member 10 or the like has ultraviolet ray blocking properties that satisfy the following formula (1): Accumulated light intensity X≦800(mJ / cm 2 )×2 / 3...Equation (1)

[0031] That is, the integrated amount of light detected on the surface of the sheet-like member 10 or the like is 800 mJ / cm 2 (hereinafter also referred to as the accumulated irradiation light amount) is irradiated from a position 7.5 cm away toward the surface of the sheet-like member 10, etc. with ultraviolet light having a wavelength of 365 nm. The sheet-like member 10, etc. has an ultraviolet shielding property such that the accumulated light amount X detected on the back side thereof is 2 / 3 or less of the accumulated irradiation light amount, preferably has an ultraviolet shielding property such that the accumulated light amount X is 1 / 2 or less of the accumulated irradiation light amount, and most preferably has an ultraviolet shielding property such that the accumulated light amount X is 2 / 5 or less of the accumulated irradiation light amount. The integrated light amount X can be detected by placing photosensitive paper on the back surface of the sheet-like member 10 or the like and observing the color change of the photosensitive paper when light is received.

[0032] Examples of synthetic resins having such UV-shielding properties include polyester, polyamide, PMMA, polycarbonate, polyimide, fluororesin, and polyolefin. To satisfy the aforementioned integrated light intensity X, these synthetic resins may be blended with a UV absorber. UV absorbers are substances that absorb UV light, become excited, and emit heat or weak energy (fluorescence or phosphorescence). While any of these can be used in the present invention, those that emit heat are preferred. Needless to say, in the case of the sheet-like member 20 having the holes 21 formed therein, the integrated light amount X of the ultraviolet light that has passed through the base material portion other than the holes 21 is the integrated irradiation light amount (800 mJ / cm 2) or less. In the case of a sheet-like member 10 made of woven fabric or the like, the ultraviolet light transmitted through the sheet-like member 10 is received almost uniformly by the photosensitive paper.

[0033] Furthermore, the aforementioned synthetic resin has a brightness of 8 or less in the Munsell color system. For example, the brightness may be set to 8 or less by coloring the synthetic resin black, blue, green, yellow, red, purple, or the like. Coloring methods include a method in which an intermediate product is prepared by adding a dye or pigment to a fiber or film, and then processing this intermediate product into the sheet-like member 10 or the like, or a method in which woven fabric or film is dyed or painted. However, if the sheet-like member 10 or the like is colored in advance (a sheet-like member 10 or the like obtained from the aforementioned intermediate product), durability can be improved.

[0034] For example, a sheet-like member can be obtained from an intermediate product obtained by coloring a transparent polyolefin material. Preferably, an intermediate product is prepared by coloring polyester, which has a high ultraviolet absorption rate, is easy to process, and is inexpensive, and the sheet-like member 10, etc. is manufactured from this intermediate product. If the sheet-like member 10, etc. is colored with a hue having a brightness of 8 or less, the sheet-like member 10, etc. will generate heat during curing by absorbing sunlight, including ultraviolet light, visible light, infrared light, etc. The heat received from the sheet-like member 10, etc. promotes drying of the coating material, thereby shortening the curing time. In the present invention, the brightness of the color of the colored sheet-like member 10, etc. is evaluated based on the Munsell color system, and the brightness is measured by comparing the sheet-like member 10, etc. with a color sample.

[0035] The coating film includes a primer 40, a surface leveling material 50, and an adhesive 60, as will be described later. It is desirable that the thickness of the sheet-like member 10, etc., is thin compared to the film thickness of the coating material. When the coating material is the primer 40, the standard application amount is 200 g / m 2 Therefore, the thickness of the primer 40 is preferably 150 μm or less, and more preferably 100 μm or less.

[0036] (Modifications of the sheet-like member 10, etc.) In the case of the sheet-like member 20 (film), it may be subjected to a matte finish or embossing process for the purpose of improving temporary fixation and diffusing and attenuating ultraviolet rays. Also, by using a sheet-like member 20 made of different films on the front and back (for example, a nylon / polyethylene laminated film), it is possible to achieve both rainwater penetration and ultraviolet ray blocking. Furthermore, the sheet-like member 10 may be a woven fabric made by weaving tapes made of resin such as polyethylene as yarns instead of threads. In this case, since the tapes themselves do not have gaps for resin impregnation, a certain gap is provided between the tapes to ensure the necessary porosity for the sheet-like member.

[0037] Next, the continuous fiber sheet will be described. The continuous fiber sheet 30 (see FIG. 5(XI) and the like) may be, for example, a strip-shaped continuous fiber sheet having an overall width (W) of 100 to 1000 mm and a length (L) of about 1 to 5 m, or a continuous fiber sheet having a length of 100 m or more. To improve portability, the continuous fiber sheet 30 may be cut into cut sheets. In this specification, the symbol "to" indicates a numerical range and is inclusive of the indicated number (the same applies hereinafter). For example, "100 to 1000 mm" means "100 mm or more and 1000 mm or less."

[0038] As the continuous sheet 30, a fiber sheet A and a fiber sheet B are exemplified. (Fiber sheet A) Fiber sheet A is a non-resin-impregnated fiber sheet in which continuous reinforcing fibers are aligned in one direction and held in a sheet shape by welding a wire fixing material such as a mesh-like support. Metal fibers such as carbon fiber, glass fiber, basalt fiber, boron fiber, titanium fiber, and steel fiber can be used as reinforcing fibers, as well as organic fibers such as aramid, PBO (polyparaphenylenebenzbisoxazole), polyamide, polyarylate, and polyester. One or more of these fibers can be used as reinforcing fibers.

[0039] When carbon fiber is used as the reinforcing fiber, for example, a plurality of resin-unimpregnated single fiber bundles each consisting of 6,000 to 24,000 single fibers (carbon fiber monofilaments) with an average diameter of 7 μm can be used by arranging them in parallel in one direction. The fiber weight of the carbon fiber sheet is 30 to 1,000 g / m 2 may be.

[0040] Examples of wire fixing materials include glass fiber, aramid fiber, fibers pre-impregnated with a low-melting-point thermoplastic resin, composite fibers with a core-sheath structure in which glass fiber is at the core and a low-melting-point heat-fusible resin is disposed around it, biaxial or triaxial mesh supports with warp and weft threads made solely of low-melting-point heat-fusible resin, and multiple weft threads perpendicular to the carbon fiber. These can be laminated on one or both sides of a sheet of carbon fiber and heated and pressurized to weld the warp and weft threads of the support to the carbon fiber sheet, or by weaving single fiber bundles into the openings of the mesh to fix the reinforcing fibers and form a sheet.

[0041] (Fiber sheet B) Fiber sheet B is a fiber sheet (strand sheet) made by aligning multiple thin, continuous fiber-reinforced plastic strands, in which the reinforcing fibers have been impregnated with matrix resin and hardened, in the longitudinal direction in a curtain-like shape, and fixing each strand to each other with a strand fixing material.

[0042] The description of the fiber sheet A is incorporated herein by reference for the reinforcing fibers. A thermosetting resin or a thermoplastic resin can be used as the matrix resin. Suitable thermosetting resins include room-temperature curing or thermosetting epoxy resins, vinyl ester resins, MMA resins, acrylic resins, unsaturated polyester resins, and phenolic resins. Suitable thermoplastic resins include thermoplastic epoxy resins, nylon, and vinylon. The resin impregnation amount is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass.

[0043] The fiber-reinforced plastic strand may be made by aligning reinforcing fibers in one direction and then impregnating them with a matrix resin to form a straight shape, or by twisting a reinforcing fiber bundle impregnated with a matrix resin, or by twisting together about 2 to 5 fiber-reinforced plastic strands or by welding or stringing them together into a strip shape.

[0044] The fiber-reinforced plastic strands used in the fiber sheet B may have a substantially circular cross-sectional shape with a diameter (d) of 0.5 to 3 mm, or a substantially rectangular cross-sectional shape with a width (w) of 1 to 10 mm and a thickness (t) of 0.1 to 2 mm, or may have various other cross-sectional shapes, such as an elliptical cross-sectional shape, as needed.

[0045] In fiber sheet B, which is unidirectionally aligned and formed into a blind, the individual wires can be spaced apart by a gap (g) of 0.05 to 3.0 mm and secured with a wire securing material. The wire securing material used to secure the individual wires can be a mesh support, as in fiber sheet A, but is preferably, for example, a yarn consisting of multiple bundles of glass fibers or organic fibers with a diameter of 2 to 50 μm, or a yarn made of synthetic fibers such as nylon or vinylon, with nylon or vinylon being more preferred. For example, a method of securing the wires with synthetic fibers can be employed in which weft yarns are used as the wire securing material, and a sheet-shaped wire consisting of multiple wires arranged in a unidirectional blind, i.e., a continuous wire sheet, is weaved perpendicular to the wires at regular intervals and then knitted. The spacing of the weft yarns is not particularly limited, but is typically selected within the range of 10 to 100 mm, taking into consideration the handleability of the resulting fiber sheet.

[0046] Next, a method for curing a coating film using a sheet-like member 10 or the like will be described with reference to the process diagrams of Figures 3 to 6. The coating film is formed by applying a coating material to a structure 100. The coating material in this embodiment includes a primer 40, a surface roughness control material 50, and an adhesive 60. The coating film curing method described with reference to Figures 3 to 6 can also be applied to a film-type sheet-like member 20.

[0047] (Process I) As a pre-treatment step before applying the primer 40, deposits (for example, deteriorated layers) and protrusions attached to the surface of the structure 100 are removed. (Process II) After the pretreatment, a primer 40 is applied to the surface of the structure 100. As an example, the primer 40 may be an epoxy resin, but is not limited thereto, and various resins (e.g., room-temperature curing resins other than epoxy resins) may be used. An example of the epoxy resin is a room-temperature curing liquid epoxy resin that uses metaxylylenediamine as a curing agent. An example of the room-temperature curing resin other than the epoxy resin is an acrylic resin.

[0048] (Step III and Step IV) The sheet-like member 10 or the like is placed on the coated surface of the primer 40 and rolled with a roller 80 or the like, thereby removing air from gaps 11 or the like between the sheet-like member 10 or the like and bringing the sheet-like member 10 or the like into close contact with the coated surface, while also forcing the primer 40 into the gaps 11 or the like. Steps III and IV correspond to the "first step."

[0049] The primer 40 that has entered the gaps 11, etc., during this process migrates to the surface of the sheet-like member 10, etc., and covers at least a portion of the surface. Here, "covering" may mean that the primer 40 has naturally seeped or spilled (dribbled) onto the surface during this process, or that it has been artificially spread. Furthermore, the phrase "at least a portion" does not necessarily mean that the primer 40 must migrate from all of the gaps 11, etc., to the surface. The primer 40 may cover a portion of the sheet-like member 10, etc., or may cover the entire sheet-like member 10, etc. For example, the primer 40 may migrate more concentratedly to the four corners of the sheet-like member 10, etc. than to other portions, or may be dispersed in a patchy pattern. Alternatively, the primer 40 that has migrated to the surface may be spread over the entire surface of the sheet-like member 10, etc., to cover it.

[0050] The primer 40 that seeps out from the surface of the sheet-like member 10, etc., takes on a shape similar to a pin or rivet, and the primer 40 present on the front and back of the sheet-like member 10, etc., that is connected via gaps 11, etc., hardens integrally. This provides an anchoring effect, which prevents the sheet-like member 10, etc., from falling off the structure 100 during curing. In other words, even if curing is performed in an exposed environment, the sheet-like member 10, etc., will not be blown away by the wind, and the temporary process can be performed securely.

[0051] Since ultraviolet rays are blocked by the sheet-like member 10 or the like located on the surface side of the primer 40, deterioration of the primer 40 due to absorption of ultraviolet rays can be prevented. Furthermore, the colored sheet-like member 10 etc. as described above generates heat by absorbing sunlight including ultraviolet light, visible light, infrared light, etc., and can therefore accelerate the drying of the primer 40. This can shorten the curing time.

[0052] (Process V) The sheet-like member 10 etc. temporarily fixed to the structure 100 is removed (corresponding to the second step). To facilitate removal, a cut may be made in the sheet-like member 10 etc. with a cutter or the like, but it is preferable to provide a trigger point in advance when temporarily fixing the sheet-like member 10 etc. Possible methods for forming the trigger portion include forming a non-perforated ear portion on the sheet-like member 10, etc., into which the primer 40 cannot penetrate, impregnating some gaps 11, etc. with the primer 40 in advance, attaching a non-perforated film (peel-off sheet) to part of the sheet-like member 10, etc., in advance, or making the size of the sheet-like member 10, etc., larger than the application area of ​​the primer 40 and forming a grip portion on the periphery. If the sheet-like member 10 or the like is to be used in a jointed manner, the sheet-like member 10 or the like at the joint portion can be peeled off from each sheet end, and the gripping portion can be provided after the joint portion is provided.

[0053] (Process VI) After curing, the unevenness correction material 50 is applied to the primer 40 to smooth out any unevenness on the surface of the primer 40. Note that "unevenness" is a term that refers to unevenness. As an example, the unevenness correction material 50 can be made of epoxy resin, but is not limited to this, and various resins (for example, room temperature curing resins other than epoxy resins) can be used.

[0054] (Step VII and Step VIII) By placing the sheet-like member 10 or the like on the unevenness correcting material 50 and handling it with a roller 80 or the like, the sheet-like member 10 or the like is brought into close contact with the coated surface while removing air from gaps 11 or the like in the sheet-like member 10 or the like, and the unevenness correcting material 50 is caused to advance toward the gaps 11 or the like (see Figures 4(VII) and 4(VIII)). Steps VII and VIII also correspond to the "first step."

[0055] The unevenness correction material 50 that has entered the gaps 11, etc., in this process migrates to the surface of the sheet-like member 10, etc., and covers at least a portion of the surface. Here, the term "covering" refers to the unevenness correction material 50 naturally seeping or spilling (dripping) onto the surface during this process, or to the material being artificially migrated and spread onto the surface. Furthermore, the phrase "at least a portion" does not necessarily mean that the unevenness correction material 50 must migrate from all of the gaps 11, etc. to the surface. The unevenness correction material 50 may cover a portion of the sheet-like member 10, etc., or may cover the entire sheet-like member 10, etc. For example, the unevenness correction material 50 may migrate more concentratedly to the four corners of the sheet-like member 10, etc. than other portions, or may be dispersed in a patchy pattern. The unevenness correction material 50 that has migrated to the surface may be spread over the entire surface of the sheet-like member 10, etc.

[0056] The unevenness correction material 50 that seeps out from the surface of the sheet-like member 10, etc., takes on a shape similar to a pin or rivet, and the unevenness correction material 50 present on the front and back of the sheet-like member 10, etc., that is connected via gaps 11, etc., hardens integrally. This provides an anchor effect, which prevents the sheet-like member 10, etc. from falling off the structure 100 during curing. In other words, even if curing is performed in an exposed environment, the sheet-like member 10, etc. will not be blown away by the wind, and the temporary process can be performed securely.

[0057] Since ultraviolet rays are blocked by the sheet-like member 10 or the like located on the surface side of the unevenness correcting material 50, deterioration of the unevenness correcting material 50 due to absorption of ultraviolet rays can be prevented. Furthermore, the colored sheet-like member 10 etc. as described above generates heat by absorbing sunlight including ultraviolet light, visible light, infrared light, etc., and can therefore accelerate the drying of the unevenness correcting material 50. This can shorten the curing time.

[0058] (Process IX) The sheet-like member 10 etc. temporarily fixed to the structure 100 is removed (corresponding to the second step). To facilitate removal, a cut may be made in the sheet-like member 10 etc. with a cutter or the like, but it is preferable to provide a trigger point in advance when temporarily fixing the sheet-like member 10 etc. Possible methods for forming the trigger portion include forming a non-perforated ear portion on the sheet-like member 10 etc. that the unevenness correction material 50 cannot penetrate, impregnating some gaps 11 etc. with the unevenness correction material 50 in advance, attaching a non-perforated film (peel-off sheet) to part of the sheet-like member 10 etc. in advance, or making the size of the sheet-like member 10 etc. larger than the application area of ​​the unevenness correction material 50 and forming a grip portion on the periphery. If the sheet-like member 10 or the like is to be used in a jointed manner, the sheet-like member 10 or the like at the joint portion can be peeled off from each sheet end, and the gripping portion can be provided after the joint portion is provided.

[0059] (Process X) The continuous fiber sheet 30 is impregnated and bonded to the surface coated with the unevenness correction material 50 using an adhesive 60. Specifically, the surface of the unevenness correction material 50 is primed with the adhesive 60, and the back surface of the continuous fiber sheet 30 is attached to this adhesive 60. A roller or the like is pressed against the surface of the continuous fiber sheet 30 to remove air bubbles between the fibers or filaments of the continuous fiber sheet 30, thereby impregnating and bonding the continuous fiber sheet 30 to the unevenness correction material 50. Thereafter, the surface of the continuous fiber sheet 30 is overcoated with the adhesive 60. Figure 5(X) is a schematic diagram showing the state immediately after the adhesive 60 has been overcoated.

[0060] The adhesive 60 is an impregnation type adhesive that adheres and integrates the continuous fiber sheet 30 to the structure 100 while impregnating the gaps in the continuous fiber sheet 30, and for example, a room temperature curing, solvent-free liquid epoxy resin that uses amines as a curing agent can be used.

[0061] The amines used as the curing agent are sufficient as long as they can cure the adhesive 60 at room temperature, and are preferably one of aliphatic polyamines, alicyclic polyamines, modified polyamines, polymercaptans, polyamides, etc., and more preferably one of aliphatic polyamines (e.g., ethylenediamine, triethylenetetramine, 2,4,6-tris(3-aminomethylphenylmethylaminomethyl)phenol, metaxylylenediamine, etc.) and alicyclic polyamines (e.g., menthenediamine, isophoronediamine, 1,3-bisaminomethylcyclohexane, etc.). In addition to the curing agent, a cure accelerator can also be used in combination.

[0062] (Steps XI and XII) A sheet-like member 10 or the like is placed on the top-coated adhesive 60 and rolled with a roller 80 or the like, thereby removing air from gaps 11 or the like in the sheet-like member 10 or the like, bringing the sheet-like member 10 or the like into close contact with the coated surface, and forcing the adhesive 60 into the gaps 11 or the like (see Figures 5(XI) and 6(XII)). Steps XI and XII also correspond to the "first step."

[0063] The adhesive 60 that has entered the gaps 11, etc., during this process migrates to the surface of the sheet-like member 10, etc., and covers at least a portion of the surface. Here, "covering" refers to the adhesive 60 naturally seeping or spilling (dripping) onto the surface during this process, or to the adhesive 60 being artificially transferred and spread onto the surface. Furthermore, the phrase "at least a portion" does not necessarily mean that the adhesive 60 must migrate from all of the gaps 11, etc., to the surface. The adhesive 60 may cover a portion of the sheet-like member 10, etc., or may cover the entire sheet-like member 10, etc. For example, the adhesive 60 may migrate more concentratedly to the four corners of the sheet-like member 10, etc. than other portions, or may be dispersed in a patchy pattern. Alternatively, the adhesive 60 that has migrated to the surface may be spread over the entire surface of the sheet-like member 10, etc.

[0064] The adhesive 60 seeping out from the surface of the sheet-like member 10, etc., takes on a shape similar to a pin or rivet, and the adhesive 60 present on the front and back of the sheet-like member 10, etc., which is connected via the gap 11, etc., hardens integrally. This provides an anchor effect, which prevents the sheet-like member 10, etc., from falling off the structure 100 during curing.

[0065] According to this embodiment, the adhesive 60, which impregnates and adheres the continuous fiber sheet 30 to the structure 100, can be cured while being protected by the sheet-like member 10 or the like. At this time, the sheet-like member 10 or the like protects the coating film from sand, moisture, and contaminants, just like a conventional protective sheet. In addition to this effect, the sheet-like member 10 or the like has high UV-shielding properties, so it is possible to prevent deterioration of the adhesive 60 due to UV rays, even in an environment exposed to direct sunlight. This makes it possible to prevent problems such as adhesion of the sheet-like member 10. It also makes it possible to prevent problems such as swelling and peeling in subsequent processes and at the construction site after completion.

[0066] Furthermore, the colored sheet-like member 10 etc. as described above generates heat by absorbing sunlight including ultraviolet light, visible light, infrared light, etc., and can therefore promote the curing reaction of the adhesive 60. Therefore, even in repair work etc. in the middle of winter, for example, the curing of the adhesive 60 can be sufficiently promoted. Furthermore, the shortened curing time (curing time) can also shorten the construction period.

[0067] (Process XIII) Step XIII is a step (corresponding to the second step) of removing the temporarily fixed sheet-like member 10 and the like, and since the step contents overlap with steps V and IX, a description thereof will be omitted.

[0068] (Process XIV) A finishing layer 90 is applied on top of the continuous fiber sheet 30 for design and stain resistance. Instead of the finishing layer 90, a protective layer that imparts UV resistance, abrasion resistance, etc. may be applied, and a desired surface treatment is carried out depending on the use of the structure 100, etc. Furthermore, before forming the finishing layer 90, the steps X to XIII may be repeated multiple times to laminate the continuous fiber sheets 30. Because the adhesive 60 is cured while being protected by the sheet-like member 10 or the like, adhesion to the above-mentioned finishing layer and protective layer is improved. It is also possible to improve the adhesion of the adhesive of the continuous fiber sheet 30 that is layered on top of the applied continuous fiber sheet 30, and the adhesive used when partially overlapping and adhering adjacent continuous fiber sheets 30. Adhesion can be rephrased as adhesive force or adhesive strength.

[0069] (Modified construction method) The above-mentioned application method includes a primer application step (step II, etc.) and an unevenness correction material application step (step VI, etc.), but either one or both of these steps may be omitted. Therefore, the structure 100 to which the primer 40 has not been applied may be coated with the unevenness correction material 50, and then the continuous fiber sheet 30 may be adhered using the adhesive 60. In this case, the sheet-like member 10 or the like is used to cure the unevenness correction material 50 and the adhesive 60, respectively. Alternatively, the adhesive 60 may be applied to the structure 100 to which the primer 40 has been applied, without applying the unevenness correcting material 50, and the continuous fiber sheet 30 may be adhered. In this case, the sheet-like member 10 or the like is used for curing the primer 40 and the adhesive 60, respectively. The adhesive 60 may be directly applied to the structure 100 to which the primer 40 and the unevenness correction material 50 have not been applied, and the continuous fiber sheet 30 may be adhered. In this case, the sheet-like member 10 or the like is used to cure the adhesive 60.

[0070] In summary, the coating materials used in the present invention include the "primer," "unevenness control material," and "adhesive" used in the continuous fiber sheet adhesive method, and each time each coating material is applied, it is possible to cure it using a sheet-like member 10 or the like.

[0071] (Example) EXAMPLES The present invention will be described in more detail below with reference to examples. In these examples, the "ultraviolet ray shielding effect" and "warming effect" were evaluated.

[0072] [Coating material] Impregnating adhesive (FP-WEC epoxy type manufactured by Nippon Steel Chemical & Material), color: purple

[0073] [Sheet-like member 1] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: None (uncolored, white) Use of UV absorbers in sheet materials: None

[0074] [Sheet-like member 2] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (green, Munsell color system brightness: 6) Use of UV absorbers in sheet materials: None

[0075] [Sheet-like member 3] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (blue, Munsell color system brightness: 4) Use of UV absorbers in sheet materials: None

[0076] [Sheet-like member 4] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (red, Munsell color system brightness: 4) Use of UV absorbers in sheet materials: None

[0077] [Sheet-like member 5] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (black, Munsell color system brightness: 0) Use of UV absorbers in sheet materials: None

[0078] [Sheet-like member 6] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (yellow, Munsell color system brightness: 8) Use of UV absorbers in sheet materials: None

[0079] [Sheet-like member 7] Sheet material: Polyester Form of sheet material: woven fabric Sheet material thickness: 0.08 mm Color treatment of sheet material: Dyeing (yellow, Munsell color system brightness: 10) Use of UV absorbers in sheet materials: None

[0080] [Sheet-like member 8] Sheet material: Polypropylene Form of sheet material: Perforated film Sheet material thickness: 0.09 mm Color treatment of sheet material: colorless and transparent Use of UV absorbers in sheet materials: None

[0081] [Sheet-like member 9] Sheet material: Polypropylene Form of sheet material: Perforated film Sheet material thickness: 0.09 mm Color treatment of sheet material: Paint (yellow, Munsell color system brightness: 8) Use of UV absorbers in sheet materials: None

[0082] [Sheet-like member 10] Sheet material: Polypropylene Form of sheet material: Perforated film Sheet material thickness: 0.09 mm Color treatment of sheet material: Paint (blue, Munsell color system brightness: 3) Use of UV absorbers in sheet materials: None

[0083] [Sheet-like member 11] Sheet material: Polypropylene Form of sheet material: Perforated film Sheet material thickness: 0.09 mm Color treatment of sheet material: Paint (green, Munsell color system brightness: 3) Use of UV absorbers in sheet materials: None

[0084] [Sheet-like member 12] Sheet material: Polypropylene Form of sheet material: Perforated film Sheet material thickness: 0.09 mm Color treatment of sheet-like components: Paint (black, Munsell color system brightness: 0) Use of UV absorbers in sheet materials: None

[0085] [Confirmation of heating effect 1] The coating material is applied to the plywood with a thickness of 200g / cm 2 The coated surface was completely covered with sheet-like members 1 and 2, and the sheet-like members were then fixed to the coated surface of the coating material using a roller. Note that sheet-like members 1 and 2 were rolled with a roller until the coating material oozed out when fixed. Also, as Reference Example 1, a blank not covered with a sheet-like member was set. The applied plywood was left to cure for 1 hour outdoors (ambient temperature: 25°C), and after 0.5 hours the surface temperature was photographed with a thermal camera, and the degree of curing of the resin on the coated surface after curing was checked by touch. If fingernail marks were left on the coating, the curing was evaluated as poor and marked with an "X", and if no fingernail marks were left on the coating, the curing was evaluated as good and marked with an "O". The results are shown in Table 1.

[0086] [Confirmation of heating effect 2] The coating material is applied to the plywood with a thickness of 200g / cm 2 The coated surface was completely covered with sheet-like members 3 to 12, and then the sheet-like members were fixed to the coated surface of the coating material using rollers. For sheet-like members 3 to 7, the sheet-like members were rolled with rollers until the coating material began to ooze out during fixing. For sheet-like members 8 to 12, the sheet-like members were pressed with rollers until the coating material began to ooze out around the holes. Furthermore, as Reference Example 2, a blank that was not covered with a sheet-like member was newly set. The applied plywood was left to cure for 1 hour outdoors (ambient temperature: 39°C), and after 0.5 hours the surface temperature was photographed with a thermal camera, and the degree of cure of the resin on the coated surface after curing was checked by touch. If fingernail marks were left on the coating, the curing was evaluated as poor and marked with an "X", and if no fingernail marks were left on the coating, the curing was evaluated as good and marked with an "O". The results are shown in Table 2.

[0087] [Confirmation of UV protection effect 1] Sheet-like member 1 and sheet-like member 2 were placed so as to completely cover a 50 mm x 50 mm piece of photosensitive paper (manufactured by Fujifilm, product name: UV Scale LM), and were fixed so that the waviness of the sheet disappeared. Next, an ultraviolet light (HLP60UV365-S1, 300 W, manufactured by Pi Photonics Co., Ltd.) was placed 7.5 cm away from the sheet-like member, and ultraviolet light with a wavelength of 365 nm was emitted at an integrated light intensity of 800 mJ / cm. 2 The light was irradiated toward the surface of the sheet-like member so that the cumulative amount of light irradiated was 1 / 3 (integrated amount of light irradiated). The cumulative amount of light X was determined using photosensitive paper placed on the back of the sheet-like member. The cumulative amount of light X was determined using the color sample attached to the photosensitive paper. When the cumulative amount of light X was 2 / 3 or less of the cumulative amount of light irradiated, the ultraviolet ray blocking effect was evaluated as "Good", and when the cumulative amount of light X was more than 2 / 3 of the cumulative amount of light irradiated, the ultraviolet ray blocking effect was evaluated as "Poor". The results are shown in Table 1.

[0088] [UV Protection Effect Confirmation 2] Sheet-like members 3 to 12 were each placed so as to completely cover a 50 mm x 50 mm piece of photosensitive paper (manufactured by Fujifilm, product name: UV Scale LM) and fixed so that the waviness of the sheet disappeared. Next, an ultraviolet light (HLP60UV365-S1, 300W, manufactured by Pi Photonics Co., Ltd.) was placed 7.5 cm away from the sheet-like member, and ultraviolet light with a wavelength of 365 nm was emitted at an integrated light intensity of 800 mJ / cm. 2The light was irradiated toward the surface of the sheet-like member so that the cumulative amount of light irradiated was 1 / 3 (integrated amount of light irradiated). The cumulative amount of light X was determined using photosensitive paper placed on the back of the sheet-like member. The cumulative amount of light X was determined using the color sample attached to the photosensitive paper. When the cumulative amount of light X was 2 / 3 or less of the cumulative amount of light irradiated, the ultraviolet ray blocking effect was evaluated as "Good", and when the cumulative amount of light X was more than 2 / 3 of the cumulative amount of light irradiated, the ultraviolet ray blocking effect was evaluated as "Poor". The results are shown in Table 2.

[0089] [Wind resistance verification] A coating material was applied to a slate board (100mm x 200mm) with a coating thickness of 200g / cm 2 The sheet-like member 2 (woven fabric) or the sheet-like member 12 (film) was then applied onto the surface while pressing with a roller. Two types of sheet-like member 12 (film) were prepared, and the pressure of the roller was adjusted for one type so that the coating material would seep out from the holes in the film, and for the other type so that the coating material would not seep out from the holes in the film. The applied slate boards were cured indoors for seven days, after which the boards were tilted at a 60-degree angle and compressed air was sprayed from a distance of approximately 10 cm towards the edge of the adhesive surface for 10 seconds to check for peeling of the sheet. An Anest Iwata compressor with a nozzle diameter of φ5 was used to spray the compressed air. The pressure was set to 5.5 MPa. If peeling or lifting of the sheet occurred, the wind resistance was deemed poor and rated with an "X", and if peeling or lifting of the sheet did not occur, the wind resistance was deemed good and rated with an "O". The sheet-like members used, whether they were fixed (weeping or not), and the results are shown in Table 3. "Weeping" means that the coating material flowed from the back surface of the sheet-like member to the front surface, and part of the surface of the sheet-like member was covered with the coating material. "No bleeding" means that the entire surface of the sheet-like member was exposed, and no area was covered with the coating material. [Table 1] [Table 2] [Table 3]

[0090] [Evaluation results] Referring to Table 1, it can be seen that the sheet-like member 2 (Example) was able to raise the surface temperature significantly higher than that of Reference Example 1. On the other hand, the uncolored sheet-like member 1 (Comparative Example) had a lower surface temperature than Reference Example 1, and no heating effect was confirmed. Furthermore, in the coating film evaluation after 1 hour of curing, the sheet-like member 1 (Comparative Example) was only hardened to the extent that fingernail marks remained on the coating film surface when palpated, whereas the sheet-like member 2 (Example) left no fingernail marks, confirming that the hardening had progressed compared to the sheet-like member 1 (Comparative Example).

[0091] The sheet-like member 2 (Example) colored green (value: 6 based on the Munsell color system) had a light emission rate of 200 (mJ / cm ) higher than the uncolored (white) sheet-like member 1 (Comparative Example). 2 ) and was able to reduce the cumulative light intensity X by approximately Furthermore, Table 2 also confirms that, as long as the brightness based on the Munsell color system is 8 or less, regardless of the form of the sheet-like member (woven fabric or film) or the coloring method, the Examples have a higher UV blocking effect and a higher effect of promoting the hardening of the coating material by heating than the Comparative Examples.

[0092] Furthermore, Table 3 shows that if at least a portion of the surface of the sheet-like member is covered with a coating material, the sheet member is less likely to peel off due to strong winds even when used in an exposed location, and the effectiveness of the curing method using the sheet-like member of the present invention, combined with its heating effect and ultraviolet blocking effect, was also confirmed.

[0093] The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible without departing from the spirit of the present invention. For example, the above-described modified examples may be appropriately combined to form a configuration. [Explanation of symbols]

[0094] 10 20 Sheet-shaped material 11 Gap 21 holes 30 Continuous fiber sheet 40 Primers 50 Unevenness adjustment material 60 Adhesive 100 structures

Claims

1. A method for curing a coating film applied to a structure, comprising: a first step of temporarily fixing a synthetic resin sheet member with the coating material of the coating film; a second step of removing the sheet-like member temporarily fixed in the first step from the structure after a predetermined curing period has elapsed, the sheet-like member is any one of a woven fabric, a nonwoven fabric, a knitted fabric, and a film material having a plurality of holes, and has a lightness of 8 or less in the Munsell color system; UV light with a wavelength of 365 nm is emitted from a position 7.5 cm away with an integrated light intensity of 800 mJ / cm ２ When the light is irradiated onto the front surface of the sheet-like member so as to satisfy the following condition, the integrated light amount detected on the back surface side of the sheet-like member is defined as the integrated light amount X. The sheet-like member has an ultraviolet ray shielding property such that the integrated light amount X satisfies the following formula (1): A method for curing a coating film, comprising: Integrated light intensity X≦800 (mJ / cm ２ )×2 / 3...Formula (1)

2. In the first step, the coating material is caused to flow from the back surface of the sheet-like member toward the front surface thereof, thereby covering at least a portion of the front surface of the sheet-like member with the coating material.

2. The method for curing a coating film according to claim 1.

3. The sheet-shaped member contains an ultraviolet absorber that converts absorbed ultraviolet rays into heat.

3. The method for curing a coating film according to claim 1 or 2.

4. The sheet-like member is any one of the woven fabric, the nonwoven fabric, and the knitted fabric, and has gaps that allow the application material to enter.

2. The method for curing a coating film according to claim 1.

5. the sheet-like member is the film material, The holes in the film material allow the coating material to enter.

2. The method for curing a coating film according to claim 1.

6. A sheet-like member for curing a coating film applied to a structure, the sheet-like member is any one of a woven fabric, a nonwoven fabric, a knitted fabric, and a film material having a plurality of holes, and is colored in any one of black, blue, green, and yellow having a value of 8 or less in the Munsell color system; UV light with a wavelength of 365 nm is emitted from a position 7.5 cm away with an integrated light intensity of 800 mJ / cm ２ When the light is irradiated onto the front surface of the sheet-like member so as to satisfy the following condition, the integrated light amount detected on the back surface side of the sheet-like member is defined as the integrated light amount X. The sheet-like member has an ultraviolet ray shielding property such that the integrated light amount X satisfies the following formula (1): A sheet-like member characterized by: Integrated light intensity X≦800 (mJ / cm ２ )×2 / 3...Formula (1)

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