JP5019901B2 - Photocurable prepreg and method for determining the cured state of the photocurable prepreg - Google Patents

Description

  The present invention relates to a photocurable prepreg formed by impregnating a fibrous base material with a resin that is cured by light irradiation and formed into a sheet shape, and a method for determining a cured state of the photocurable prepreg.

  Conventionally, repair and reinforcement of tunnels and bridges, concrete stripping prevention measures, repair and reinforcement of sewer facilities, concrete anticorrosion measures, and concrete surface applied to increase the flow rate of pipes and waterways As a measure for reducing the roughness coefficient, for example, a fiber sheet pasting method in which a fiber sheet such as glass fiber, carbon fiber, or aramid fiber is pasted while being impregnated with a resin is used. In this fiber sheet affixing method, for example, after correcting the unevenness of the concrete surface, a primer or an undercoat material is applied, and the fiber sheet is affixed while impregnating the resin (impregnating resin). The fiber sheets are laminated while being repeatedly impregnated with resin. At this time, affix the fiber sheet while carrying out careful defoaming work so that bubbles do not intervene between the fiber sheet and the lower layer resin (undercoat material or lower layer impregnated resin). Especially when applied to concrete anticorrosion measures for sewer facilities, the thickness of the resin layer and the occurrence of pinholes greatly affect the anticorrosion performance, so work by skilled workers is required.

  On the other hand, so-called photo-curing prepregs that have been formed into a sheet by impregnating a fiber base material such as glass fiber with a resin containing a photopolymerization initiator in a factory in advance (for example, patent documents) 1, see Patent Document 2). For example, this photo-curable prepreg is obtained by impregnating a fibrous base material with a resin mixed with two kinds of photopolymerization initiators, and then setting the uncured resin (A stage state) and the fibrous base material to PET (polyethylene terephthalate). It is formed by being sandwiched between transparent films such as films. In addition, in a factory, ultraviolet rays or visible light of a specific wavelength is irradiated, only one type of photopolymerization initiator is reacted to advance curing of some resins, and a thickened state (incompletely cured state, (B stage state). Then, by bringing the photo-curable prepreg in the B stage state into the field, removing the transparent film and attaching it to the concrete surface, and irradiating with light of a specific wavelength at which the remaining one type of photopolymerization initiator reacts The resin is completely cured, and a light curable prepreg is suitably placed on the concrete surface.

  In such a photo-curable prepreg, a fibrous base material is impregnated with a resin in advance at a factory and formed into a B-stage, so that it can be cured in a relatively short period of time and has a uniform thickness. Now, there is no pinhole, and it can be applied easily and in a short period of time without requiring a skilled worker.

  On the other hand, the curing confirmation of the photocurable prepreg is performed by measuring the illuminance of irradiated light and managing the irradiation time, and is performed by a hammering inspection using a hammer after curing. For this reason, in particular, when checking the curing state of a photo-curable prepreg affixed to a high place such as a tunnel lining, it is necessary for the inspector to approach using an aerial work vehicle etc. There was a problem of hanging. In particular, when a plurality of photocurable prepregs are installed over a wide range, the cured state may not be accurately determined for all the photocurable prepregs.

On the other hand, for example, in the photocurable prepreg disclosed in Patent Document 3, a dye whose color tone is changed by ultraviolet rays is mixed in the resin of the photocurable prepreg and / or a primer applied to the concrete surface, and light irradiation is performed. The cured state of the photocurable prepreg can be discriminated by using the color tone of the dye that changes with the index as an index. In this photo-curable prepreg, the dye is changed from colored to colorless and transparent by light irradiation, thereby preventing the irradiated light from being blocked by the dye and inhibiting the curing of the resin. Yes.
Japanese Patent No. 3479202 JP-A 63-186744 JP 60-123538 A

  However, in the photo-curable prepreg mixed with the above-mentioned pigment, the entire photo-curable prepreg gradually changes to colorless and transparent as the resin cures. For example, a dim working environment such as a tunnel or a sewer facility pipe When pasting under, there is a problem that the change in color tone is difficult to visually confirm, and the cured state of the photocurable prepreg cannot be accurately captured.

  In general, a light source for irradiating light is disposed opposite to the approximate center of the sheet-like photocurable prepreg so that the light emitted from the light source is irradiated on the entire surface of the photocurable prepreg. Curing work is performed. For this reason, compared to the center side of the photo-curing prepreg with a small separation distance from the light source, the illuminance of light toward the end portion where the separation distance is large is relatively small, and light curing is performed by capturing the color change at the center side. There is a risk of misunderstanding that the mold prepreg is completely cured. In other words, the end side changes to colorless and transparent with a delay from the center side, so the end side that has not changed completely colorless and transparent is mistaken for being completely colorless and transparent. There was a problem that it was easy.

  In view of the above circumstances, an object of the present invention is to provide a photocurable prepreg that can easily and accurately determine a cured state and a cured state determination method for a photocurable prepreg.

  In order to achieve the above object, the present invention provides the following means.

  The photocurable prepreg of the present invention is a photocurable prepreg that is formed into a sheet by impregnating a fibrous base material with a resin containing a photopolymerization initiator and cured by irradiating with light of a specific wavelength. A marker portion including a photochromic material whose color tone is changed by the light is provided on a part of the surface.

  In the present invention, the marker portion can be changed from colored to another colored by the photochromic material, and the changing color tone can be selected according to the type of the photochromic material and the wavelength of the irradiated light. As a result, the color tone change of the marker portion provided on a part of the surface can be accurately captured, for example, even in a dimly lit working environment, and the misperception of the cured state can be prevented by using such a color tone change of the marker portion as an index. .

  Moreover, in the photocurable prepreg of the present invention, it is desirable that the marker portion is provided on the end side.

  In this invention, by capturing the change in the color tone of the marker portion, it is possible to capture the cured state of the end portion side that is delayed with respect to the center side by the irradiated light, whereby the entire photocurable prepreg is completely cured I can capture exactly what I did.

  Furthermore, in the photocurable prepreg of the present invention, the photocurable prepreg is formed in a planar shape in the plan view, and along each side in the vicinity of a corner portion or in the vicinity of each of two parallel sides, More desirably, a marker portion is provided.

  In the present invention, the above-described effects can be obtained with certainty by providing the marker portion along each side, particularly in the vicinity of the corner portion where curing is delayed or in the vicinity of two parallel sides.

  In the photocurable prepreg of the present invention, it is desirable that the marker portion is formed by arranging a plurality of linear or spot-like photochromic materials with a gap therebetween.

  In this invention, even when the marker portion is provided on the light-irradiated surface of the photocurable prepreg, the irradiated light is irradiated to the resin in the portion where the marker portion is provided through the gaps between the plurality of photochromic materials. Can do. Thereby, it can prevent reliably that light is interrupted by the marker part which changes to color, and the hardening defect of resin arises.

  Furthermore, in the photocurable prepreg of the present invention, the marker portion may be formed by laminating the photochromic material on a transparent film base material and affixing the surface to the surface.

  In this invention, the marker part separately formed beforehand can be affixed on a photocurable prepreg in a factory or the field. Thereby, a marker part can be freely provided at an arbitrary position where the cured state of the photocurable prepreg can be accurately determined according to the shape and size of the photocurable prepreg, the field environment, and the like.

  Moreover, in the photocurable prepreg of the present invention, the photochromic material may change the color tone in response to the light having two or more wavelengths different from each other in the visible light region.

  In the present invention, the marker portion can be arbitrarily selected by the light of the specific wavelength irradiated when the B-stage is formed, and the marker portion is further changed by any arbitrary wavelength by the light of the specific wavelength irradiated in the field. It can be changed to the selected color. Thereby, according to the work environment which affixes a photocurable prepreg, it can be set as the color which an operator can distinguish easily the color tone change of a marker part.

  The curing state determination method of the photocurable prepreg of the present invention is a photocurable type in which a fibrous base material is impregnated with a resin containing a photopolymerization initiator and formed into a sheet shape and cured by irradiation with light of a specific wavelength. A method for determining a cured state of a prepreg, wherein a marker portion including a photochromic material whose color tone is changed by the light irradiation is provided in the light irradiation region, and curing is performed using the changed color tone of the marker portion as an index. It is characterized by determining the state.

  In the present invention, the marker portion can be changed from colored to another colored by the photochromic material, and the changing color tone can be selected according to the type of the photochromic material and the wavelength of the irradiated light. As a result, the color tone change of the marker portion provided in the light irradiation region can be accurately captured, for example, even in a dimly lit working environment, and the photo curable prepreg is cured by using such a color tone change of the marker portion as an index. The state can be accurately determined.

  According to the photocurable prepreg and the cured state determination method of the photocurable prepreg of the present invention, it is possible to reliably visually check the color tone change of the marker portion by changing from colored to other colored, Even in a dim work environment or a photo-curing prepreg attached to a high place, the cured state can be easily and accurately determined. In addition, even when a plurality of photo-curable prepregs are pasted over a wide range, the cured state of all the photo-curable prepregs can be easily and accurately detected by capturing the color tone change of the marker portion provided on each photo-curable prepreg. Can be determined.

  Hereinafter, with reference to FIG. 1 to FIG. 5, a photocurable prepreg and a cured state determination method of the photocurable prepreg according to the first embodiment of the present invention will be described. This embodiment is intended to repair and reinforce concrete structures such as tunnels, bridges, sewerage facilities, concrete stripping prevention measures and concrete anticorrosion measures, and to increase the flow rate of pipes and waterways. The present invention relates to a photocurable prepreg used for measures for reducing the roughness coefficient, and a method for determining a cured state of the photocurable prepreg.

  As shown in FIGS. 1 and 2, the photocurable prepreg A of the present embodiment is obtained by impregnating a fibrous base material 2 such as a glass mat or glass cloth with a resin (photocurable resin) 1 to form a sheet. Moreover, it is formed in a rectangular shape in plan view. In the present embodiment, the resin 1 impregnated in the fibrous base material 2 includes two types of photopolymerization initiators together with additives such as monomers, oligomers, and stabilizers. And this resin 1 hardens | cures by each irradiating the light of two specific wavelengths of a visible light area, ie, when irradiated with the light of one specific wavelength of a visible light area, The seed photopolymerization initiator is exposed to light and reacts to cause some resin 1 to polymerize and cure. Further, by irradiating light having a specific wavelength other than the visible light region, the remaining one kind of photopolymerization initiator is exposed and reacted, and the uncured resin 1 is polymerized and cured. Thereby, the photocurable prepreg A of the present embodiment is completely cured by irradiating light of two different specific wavelengths in two stages.

  On the other hand, in the photocurable prepreg A of the present embodiment, as shown in FIG. 1, a part of the other surface (surface A2) opposite to the one surface A1 to be attached to the surface of the concrete structure (concrete surface), A marker portion 3 including a photochromic material 3a is provided. The marker portion 3 is provided in the vicinity of the four corner portions 4a (on the end portion 4 side) of the photocurable prepreg A having a rectangular shape in plan view, and is formed in a circular shape in plan view. Further, as shown in FIG. 3, each marker portion 3 is formed by arranging and arranging a plurality of photochromic materials 3a applied in a spot shape on the surface A2 with a gap therebetween. That is, the plurality of spot-like photochromic materials 3a of each marker part 3 are provided discontinuously.

  Here, the photochromic material 3a forming each marker part 3 has a molecular weight, for example, by phorochromic molecules such as azobenzenes, spiroplans, spirooxazines, diarylethenes, fulgides, and chromenes, that is, by the action of light. It consists of molecules that can change to different isomers with different visible light absorption spectra without change, and when irradiated with light of one specific wavelength in the visible light region, the binding form or electronic state changes, and the visible light absorption spectrum becomes The color tone changes. Further, when light of another specific wavelength in the visible light region is further irradiated, the visible light absorption spectrum is further changed to change to another color tone. Moreover, the photochromic material 3a in the present embodiment corresponds to two types of photopolymerization initiators mixed in the resin 1 of the photocurable prepreg A, and is irradiated with light of one specific wavelength in the visible light region. When a photopolymerization initiator of a kind is exposed and a part of the resin 1 is cured, it changes to a certain color tone and is irradiated with light of a different specific wavelength that sensitizes the remaining one kind of photopolymerization initiator. , Change to other colored tones.

  Specifically, when a fulgide compound is used for the photochromic material 3a in the present embodiment, for example, as shown in Table 1, when irradiated with light (ultraviolet rays) having a wavelength of 380 nm or less, the photochromic material 3a changes to black and further has a wavelength of around 420 nm. When the light (visible light) is irradiated, the color changes from black to blue. When the black photochromic material 3a is irradiated with light (visible light) having a wavelength of about 540 nm, the color changes to green, and when light (visible light) having a wavelength of about 420 nm is irradiated, the color changes from green to cyan. When the black photochromic material 3a is irradiated with light (visible light) having a wavelength of approximately 676 nm, the color changes to red, and when light (visible light) having a wavelength of approximately 420 nm is irradiated, the color changes from red to magenta. Further, when the black photochromic material 3a is irradiated with light having a wavelength of about 540 nm (visible light) and light having a wavelength of about 676 nm (visible light), the black photochromic material 3a turns yellow, and further irradiated with light having a wavelength of about 420 nm (visible light). Then, it changes from yellow to white. That is, by using such a chromochromic material 3a and irradiating light of a specific wavelength, the color tone of the marker part 3 can be changed from colored to another colored, and the wavelength of the irradiating light is selected. Thus, a changing color tone can be selected.

  And manufacture of the photocurable prepreg A provided with the above marker parts 3 is as follows. As shown in FIG. 4, the fiber base material 2 is rolled from the roll 5 which wound the fiber base material 2 in the factory. At the same time, the fibrous base material 2 is impregnated with the resin 1 by being immersed in the resin 1 containing two kinds of photopolymerization initiators stored in the resin tank 6. At this time, the transparent films 7 are respectively drawn out from a pair of rolls 8 that are arranged on both sides of the fibrous base material 2 and wound with a transparent film 7 such as a PET film. Then, the fibrous base material 2 and both transparent films 7 are passed between a pair of upper and lower rolling rollers 9, and the both transparent films 7 are brought into close contact with each other so as to sandwich the fibrous base material 2 impregnated with the resin 1. .

  Here, in this embodiment, for example, a black photochromic is previously applied to one surface 7b of the transparent film 7 (7a) that is in close contact with the surface A2 of the fibrous base material 2 (photocurable prepreg A) impregnated with the resin 1. The marker 3 is provided by applying or printing the material 3a. For this reason, the marker part 3 adheres at the stage where the transparent film 7a is brought into close contact with the surface A2 of the photocurable prepreg A. In addition, this marker part 3 (photochromic material 3a) has larger adhesive force with respect to the resin 1 of the photocurable prepreg A than the transparent film 7a, and it transfers to the surface A2 of the photocurable prepreg A by peeling off the transparent film 7a ( Or copied).

  Then, the photocurable prepreg A in a state in which the resin 1 and the fibrous base material 2 in such an uncured state (A stage state) are sandwiched between the transparent films 7 is used to expose one type of photopolymerization initiator to visible light. It passes through the light unit 10 provided with the lamp 10a. At this time, light having a specific wavelength of, for example, around 676 nm is irradiated from the visible light lamp 10a, whereby a part of the resin 1 is polymerized and cured, and the photocurable prepreg A is made into a B stage in an incompletely cured state. At the same time, for example, the black photochromic material 3a of the marker portion 3 changes to red. The photocurable prepreg A that has passed through the light unit 10 and turned into a B-stage is cut with a cutter 11a or the like and formed with a predetermined length and width. In addition, while cutting in this way, as shown in FIG. 1, the marker part 3 is arrange | positioned in the vicinity of each of the four corner parts 4a of the photocurable prepreg A. As shown in FIG.

  Next, a method of attaching the photocurable prepreg A manufactured as described above to the concrete surface and installing it will be described, and the photocurable prepreg A of the present embodiment and a curing state determination method of the photocurable prepreg A will be described. The operation and effect of will be described.

  The photocurable prepreg A that has been previously B-staged as described above is carried into the field, and the transparent film 7 is peeled off and removed. At this time, the marker portion 3 which is formed by applying the photochromic material 3a to the transparent film 7a and becomes red due to the B-staging is transferred to the exposed surface A2 of the photocurable prepreg A.

  Then, the photocurable prepreg A is attached to the concrete surface which has been corrected for unevenness and applied with a primer and an undercoat, and is defoamed and installed. Here, since the photocurable prepreg A at the time of the pasting work has flexibility in the B stage state (incompletely cured state), the pasting work can be easily performed.

  Next, a visible light lamp for curing the photocurable prepreg A is disposed opposite to the approximate center of the sheet-shaped photocurable prepreg A, and the light emitted from the visible light lamp is the entire surface A2 of the photocurable prepreg A. To be irradiated. That is, the visible light lamp is arranged so that the photocurable prepreg A is disposed in the light irradiation region.

  Then, the light having a specific wavelength of, for example, about 420 nm is irradiated from the visible light lamp, and the remaining one type of photopolymerization initiator of the photocurable prepreg A is exposed, and the uncured resin 1 is polymerized and cured. start. At this time, the central side where the distance from the visible light lamp is small, that is, the portion where the illuminance of light is large is cured first, and the end 4 side where the distance from the visible light lamp is large is cured late. Go. Moreover, in this embodiment, the marker part 3 provided in the vicinity of each of the four corners 4a of the photocurable prepreg A that cures the most lately depends on the illuminance and irradiation time of light of a specific wavelength. The color tone is gradually changed from magenta to red before light irradiation.

  At this time, the worker who performs the curing work of the photo-curing type prepreg A visually confirms the changing color tone of the marker unit 3, and corresponds to the illuminance and irradiation time of light of a specific wavelength as shown in FIG. In contrast, this is compared with the color sample 12 created corresponding to the cured state of the uncured resin 1. Then, it is confirmed that the color tone (magenta color) of the marker portion 3 in a state where the resin 1 shown in the color sample 12 is completely cured matches the color tone of the marker portion 3 provided in the photocurable prepreg A. Thus, it can be confirmed that the resin 1 on the end 4 side (corner portion 4a side) of the photocurable prepreg A that is cured with delay is completely cured. Then, by confirming the curing of the resin 1 on the end 4 side in this way, it is possible to accurately determine that the entire photocurable prepreg A is completely cured using the marker portion 3 as an index.

  In addition, since the marker unit 3 changes from a color (for example, red) to another color (for example, a magenta color), and as shown in Table 1, a color tone that varies depending on the work environment in which the photocurable prepreg A is installed. Therefore, the change in color tone can be easily and accurately grasped as compared with a photo-curable prepreg in which a conventional mixed pigment changes to colorless and transparent as the resin cures. As a result, even when pasting in a dimly lit working environment such as a tunnel or a sewer facility, the change in the color tone is easy to visually confirm, and the change in the color tone of the marker portion 3 is used as an index. The cured state of can be accurately captured.

  Furthermore, in the present embodiment, the marker portion 3 provided on the photocurable prepreg A is formed by a set of a plurality of photochromic materials 3a applied in a spot shape on the surface A2 of the photocurable prepreg A, that is, Since the plurality of spot-like photochromic materials 3a of each marker portion 3 are discontinuously provided with a gap between each other, the irradiated light passes through the gap of the photochromic material 3a and is located on the deep side of the portion where the marker portion 3 is provided. It is possible to reliably irradiate the resin 1, and it is possible to prevent the resin 1 on the deep side from remaining in an uncured state due to light being blocked by the marker portion 3 that changes in color. Thereby, it can prevent reliably that a curing failure arises in the photocurable prepreg A.

  Furthermore, since the photochromic material 3a changes the color tone in response to light of two or more specific wavelengths different from each other in the visible light region, the marker portion 3 is irradiated with light of the specific wavelength irradiated when the B stage is formed. Can be changed to an arbitrary selected color, and the marker unit 3 can be changed to another arbitrary selected color by light of a specific wavelength irradiated in the field. Thereby, according to the work environment which affixes photocurable prepreg A, it can be set as the color which an operator can distinguish easily the color tone change of the marker part 3. FIG.

  Therefore, according to the photocurable prepreg A and the cured state determination method of the photocurable prepreg A of the present embodiment, the color tone change of the marker unit 3 can be surely confirmed visually by changing from colored to another colored. As a result, it is possible to easily and accurately discriminate the cured state of the photocurable prepreg A attached in a dimly lit working environment or at a high place. Further, even when a plurality of photo-curing prepregs A are pasted over a wide range, all the photo-curing types can be easily and accurately obtained by capturing the color tone change of the marker portion 3 provided on each photo-curing prepreg A. It is possible to determine the cured state of the prepreg A.

  The first embodiment of the photocurable prepreg and the cured state determination method of the photocurable prepreg according to the present invention has been described above, but the present invention is not limited to the above-described embodiment and does not depart from the spirit thereof. The range can be changed as appropriate. For example, in the present embodiment, the marker portion 3 is provided in the vicinity of each of the four corner portions 4a of the photocurable prepreg A formed in a rectangular shape in plan view, but the marker portion 3 is delayed. It is only necessary to be provided on the end 4 side of the photocurable prepreg A to be cured, for example, as shown in FIG. It may be provided continuously along the side 4b.

  In the present embodiment, the marker portion 3 is formed by collecting and arranging a plurality of spot-like photochromic materials 3a with a gap therebetween. However, as shown in FIG. The photochromic materials 3a may be formed in a collective arrangement with a gap.

  Furthermore, the marker part 3 does not necessarily have to be formed by arranging and arranging a plurality of photochromic materials 3a with a gap. For example, the marker part 3 can be accurately captured even if the marker part 3 is formed small. In the case where the resin 1 in the portion where the marker portion 3 is provided is surely cured by the diffraction of the irradiated light or the polymerization chain of the resin 1 by the irradiated light, even if the marker portion 3 is constituted by the continuous photochromic material 3a. Good.

  In this connection, in the present embodiment, the marker portion 3 is provided on the surface (other surface) A2 on the side irradiated with the light of the photocurable prepreg A. However, the light on the side attached to the concrete surface is used. The marker portion 3 may be provided on one surface (front surface) A1 of the curable prepreg A. In this case, since the color tone of the marker portion 3 is changed by the light transmitted through the photocurable prepreg A, the light is not blocked by providing the marker portion 3, and the marker portion 3 is formed by the continuous photochromic material 3 a. Even if formed, it is possible to reliably prevent the curing failure of the photocurable prepreg A.

  In the present embodiment, the photocurable prepreg A is formed in a rectangular shape in plan view, but the marker portion 3 is provided on the end portion 4 side where the resin 1 is delayed by the irradiated light. If it is, it is not necessary to limit the planar view shape of the photocurable prepreg A in particular.

  Next, with reference to FIGS. 7 to 9, a photocurable prepreg and a cured state determination method for the photocurable prepreg according to the second embodiment of the present invention will be described. As in the first embodiment, the present embodiment relates to a photocurable prepreg used for repair, reinforcement, concrete anticorrosion measures for tunnels, bridges, sewerage facilities, and the like, and a cured state determination method for the photocurable prepreg. Therefore, here, the same reference numerals are given to the components common to the first embodiment, and the detailed description thereof is omitted.

  In this embodiment, unlike 1st Embodiment, as shown in FIG.7 and FIG.8, the marker part 3 is formed by laminating | stacking the photochromic material 3a on transparent film base materials 3b, such as PET film, for example. . And when this marker part 3 affixes the photochromic material 3a side to the concrete surface (surface: refer FIG. 2) B1 when affixing the photocurable prepreg B of a B stage state to a concrete surface, As shown in FIG. 9, it is installed on the end 4 side (near the corner 4a) of the photocurable prepreg B (in the irradiation region where the light having a specific wavelength for curing the uncured resin 1 is irradiated). For this reason, when the photocurable prepreg B of this embodiment is affixed to the concrete surface, the marker part 3 is interposed between the primer and primer applied to the concrete surface and the photocurable prepreg B. become.

  Here, the marker part 3 of this embodiment may be affixed in the factory which forms the photocurable prepreg B by making it B-stage. Further, as shown in FIG. 9, it is not necessarily required to be attached to the end 4 side in the vicinity of the corner 4a. The photocurable prepreg B is used depending on the shape and size of the photocurable prepreg B, the field environment, and the like. The marker part 3 may be freely attached and provided at an arbitrary position where the cured state of can be accurately determined.

  Then, the photocurable prepreg B installed as described above is irradiated with light of a specific wavelength that cures the uncured resin 1, whereby the remaining one type of photopolymerization initiator is exposed to cure the resin 1. At the same time, the light transmitted through the photocurable prepreg B is irradiated onto the marker unit 3, and the color tone of the marker unit 3 changes.

  As in the first embodiment, an operator who performs the curing operation of the photocurable prepreg B visually checks the changing color tone of the marker unit 3 and compares it with a color sample 12 as shown in FIG. Then, the operator confirms that the color tone in the state where the resin 1 of the photocurable prepreg B shown in the color swatch 12 is completely cured and the color tone of the marker portion 3 match, whereby the photocurable prepreg B is obtained. It can be determined that the end 4 side that is cured with a delay is completely cured.

  Therefore, in the photocurable prepreg B and the method for determining the cured state of the photocurable prepreg B according to the present embodiment, since the marker portion 3 formed separately in advance can be attached to the photocurable prepreg B, The marker part 3 can be freely provided at an arbitrary position where the cured state of the curable prepreg B can be accurately discriminated, and the photocuring can be easily and accurately photocured by capturing the color change of the marker part 3 thus provided. The cured state of the mold prepreg B can be determined.

  The second embodiment of the photocurable prepreg and the cured state determination method of the photocurable prepreg according to the present invention has been described above, but the present invention is not limited to the above-described embodiment and does not depart from the spirit thereof. The range can be changed as appropriate. For example, in this embodiment, when the photocurable prepreg B in the B-stage state is attached to the concrete surface, the marker portion 3 is attached to the surface B1, and the transparent film base material of the marker portion 3 is installed. 3b is bonded to a primer and an undercoat material applied to a concrete surface located within an irradiation region that irradiates light of a specific wavelength for curing the uncured resin 1, for example, and a photocurable prepreg B is applied thereon. Even in such a case, the same effect as in the present embodiment can be obtained.

  Moreover, the marker part 3 may be affixed and installed in the surface B2 by the side of irradiating the light of the photocurable prepreg B similarly to 1st Embodiment. In this case, as in the first embodiment, it is desirable to form a plurality of spot-like or linear photochromic materials 3a with a gap in the transparent film substrate 3b. Further, when the marker portion 3 is provided on the light irradiation side, it may be attached to the surface of the transparent film 7 (see FIG. 2) attached to the B-staged photocurable prepreg B. In this case, the photocurable prepreg B is attached to the concrete surface with the transparent film 7 on the light irradiation side left, and the uncured resin 1 is cured by irradiating light while passing through the transparent film 7. At the same time, the cured state of the resin 1 can be determined using the color tone change of the marker portion 3 as an index. After the photocurable prepreg B is completely cured, the transparent film 7 is peeled off and removed, and the colored marker portion 3 can be removed.

  Furthermore, since the same effect as this embodiment can be acquired if the marker part 3 is provided in the irradiation region of the light which hardens the photocurable prepreg B, for example, as shown in FIG. When the prepreg B is installed, the marker portion 3 may be attached to the concrete surface C1 located in the vicinity of the outside of the end portion 4 of the photocurable prepreg B. Even in such a case, since the marker unit 3 is disposed in the irradiation region T of the light irradiated to the photocurable prepreg B, the change in the color tone of the marker unit 3 is captured and the photocurable prepreg B is cured. The state can be determined.

It is a top view which shows the photocurable prepreg which concerns on 1st Embodiment of this invention. FIG. 2 is a view taken along line XX in FIG. 1. It is the figure which expanded the marker part of the photocurable prepreg of FIG. It is the figure used for description of the method of manufacturing the photocurable prepreg which concerns on 1st Embodiment of this invention. It is a figure which shows the color sample showing the color tone of the marker part with respect to the hardening state of a photocurable prepreg. It is a top view of the modification of the photocurable prepreg which concerns on 1st Embodiment of this invention. It is a top view which shows the marker part provided in the photocurable prepreg which concerns on 2nd Embodiment of this invention. It is a XX arrow directional view of FIG. It is a top view which shows the photocurable prepreg which concerns on 2nd Embodiment of this invention which affixed the marker part of FIG.7 and FIG.8. It is a figure which shows the state which affixed the marker part of FIG.7 and FIG.8 in the irradiation area | region of the light outside a photocurable prepreg.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin 2 Fibrous base material 3 Marker part 3a Photochromic material 3b Transparent film base material 4 End part 4a Corner part 4b Side (two parallel sides)
7 Transparent film 12 Color sample A Photocurable prepreg A1 One side (surface)
A2 Other side (surface)
B Photo-curing prepreg B1 One side (surface)
B2 Other side (surface)
C1 Concrete surface T Light irradiation area

Claims (7)

In a photocurable prepreg that is formed into a sheet by impregnating a resin containing a photopolymerization initiator into a fibrous base material and cured by irradiating with light of a specific wavelength,
A photocurable prepreg characterized in that a marker portion comprising a photochromic material whose color tone is changed by the irradiated light is provided on a part of the surface. The photocurable prepreg according to claim 1,
The photocurable prepreg characterized in that the marker portion is provided on the end side. In the photocurable prepreg according to claim 2,
The photocurable prepreg is formed in a square shape in plan view, and the marker portion is provided in the vicinity of a corner portion or in the vicinity of each of two parallel sides along each side. Photo-curable prepreg. In the photocurable prepreg according to any one of claims 1 to 3,
The photocurable prepreg characterized in that the marker portion is formed by arranging a plurality of linear or spot-like photochromic materials with a gap therebetween. In the photocurable prepreg according to any one of claims 1 to 4,
The photocurable prepreg, wherein the marker portion is formed by laminating the photochromic material on a transparent film base material, and is attached to the surface. In the photocurable prepreg according to any one of claims 1 to 5,
The photocurable prepreg characterized in that the photochromic material changes a color tone in response to the light having two or more wavelengths different from each other in a visible light region. A method of determining the curing state of a photocurable prepreg that is formed into a sheet by impregnating a resin containing a photopolymerization initiator into a fibrous base material and cured by irradiating with light of a specific wavelength,
A photo-curing type characterized in that a marker portion including a photochromic material whose color tone changes by irradiation of the light is provided in the light irradiation region, and a cured state is determined using the changed color tone of the marker portion as an index. A method for determining the prepreg curing state.

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