JP6550806B2 - Method of repairing or reinforcing the target structure - Google Patents

Description

  The present invention relates to a method for repairing or reinforcing a target structure, and a pressure-sensitive adhesive sheet for repair or reinforcement used therefor. More specifically, it is a method capable of largely omitting the repair or reinforcement work of the target structure, performing in a short time, and uniformly repairing or reinforcing regardless of the skill of the operator, and irradiating the ultraviolet light and the like. Provides a method for bonding the tackiness sheet for repair or reinforcement to the target structure and then proceeding curing of the target structure at a normal environmental temperature, and the tackiness sheet for repair or reinforcement used in the method Do.

  In the era of high economic growth in Japan, many social infrastructures such as roads, flood control, sewerage, ports, public housing, parks, beaches, airports, navigation signs, and government facilities were developed. These social infrastructures have also become obsolete over the years, and everything cannot be renewed at the same time, so the current situation is that they are being rebuilt one after another while repairing and reinforcing them.

  Repair and reinforcement (hereinafter also referred to as “repair and reinforcement”) is an immediate urgent issue from the viewpoint of safety, and it is necessary to repair and reinforce many aging social infrastructures, for example, in public facilities. There is. However, while recognizing the necessity of repair and reinforcement, there are many problems. For example, A) There are a huge number of aging social infrastructure that needs to be repaired and reinforced so that there are more than 10,000 tunnels alone, and B) repair and reinforcement technology, visual inspection and sounding, etc. There are many tasks that require time and effort, such as inspection technology, and that such tasks can not be standardized, the passing on of the know-how of tasks is not enough, and efficient tasks can not be realized, C) Infrastructure development The problem is that many expenses, including labor costs, are required.

  Among repair and reinforcement methods, for example, some methods for repair and reinforcement of concrete in a tunnel have been proposed. For example, among the concrete in a tunnel, a method of applying an adhesive, a paint, etc. several times to a portion requiring repair / reinforcement, and a method of bonding a sheet for repair / reinforcement have been proposed. Among them, the sheet for repair / reinforcement is to prevent concrete deterioration factors such as water, oxygen, carbon dioxide gas, or chloride ions from entering the concrete, and reinforce the concrete which is deteriorated and lowered in strength. Are preferably used. Various techniques for repairing and reinforcing concrete using repair and reinforcement sheets have been proposed.

  In Patent Document 1, a concrete repair sheet having an intermediate layer having a resin film and a surface layer made of a fabric material laminated on both surfaces of the resin film with an adhesive resin is applied to the concrete surface to be repaired. The technique regarding the repair method of the concrete which apply | coats a paint on the surface layer on the opposite side to the concrete surface of the sheet | seat for concrete repair which affixed and was stuck after that, is proposed. According to this technique, since the surface layer in contact with the concrete surface is a fabric material having a large surface area, even if the concrete surface is vertical or a ceiling surface, the concrete is applied before the construction adhesive is completely cured. The repair sheet is unlikely to drop or peel off, and the construction quality is high. Also, because the construction adhesive and paint are completely blocked by the concrete repair sheet, the construction time can be shortened without waiting for the construction adhesive to harden and applying the paint. .

  Patent Document 2 discloses a concrete structure in which a protective layer and an adhesive application layer are adhered and an adhesive layer which is an adhesive or a hot melt adhesive is formed on the adhesion surface of the adhesive application layer to a concrete structure. Techniques related to repair, reinforcement, and deterioration prevention sheets have been proposed. According to this technology, by attaching this sheet for repair, reinforcement, and deterioration to a part requiring repair on site, the work of repair and reinforcement for preventing the fall of concrete is reduced, shortened, and quality It is possible to stabilize.

  In Patent Document 3, a light-curable fiber-reinforced resin sheet which is cured and bonded when exposed to ultraviolet light is applied to the surface of a portion requiring repair of a concrete structure, cured by ultraviolet light and bonded to repair and reinforce the concrete structure. A method has been proposed. This technology heats the photocurable fiber-reinforced resin sheet applied to the surface of the concrete structure requiring repair to a temperature that plasticizes it to soften it to a plasticized state, and exerts pressure on the sheet to the concrete surface. The sheet is strongly adhered, and the sheet is irradiated with ultraviolet light to be cured, and the sheet is adhered to a concrete surface for repair and reinforcement.

JP, 2010-144360, A Unexamined-Japanese-Patent No. 2004-27718 JP 2005-120820 A

  However, in the technique proposed in Patent Document 1, since the construction adhesive is applied to a concrete or a sheet for repairing a concrete at the time of repair work of concrete, there is a problem that the workability is bad. Moreover, since the application amount of the construction adhesive cannot be made constant, there is a problem that the reproducibility of the repair work is lowered. In addition, there is a possibility that the adhesive for construction may be worn on the hand or put on the face during the measurement operation, and there is a problem that the unfamiliar worker has a large burden on the worker.

  Further, in the technology proposed in Patent Document 2, the adhesive layer is a pressure-sensitive adhesive or a hot-melt adhesive, so that, for example, when the adhesive layer is a pressure-sensitive adhesive, there is a problem that the adhesiveness is insufficient. was there. If the adhesive layer is a hot melt adhesive, the adhesive may soften and flow due to heating during bonding, so if the concrete surface is a vertical surface or a ceiling surface, a sheet may be used. There was a problem that it was difficult to bond the material to the concrete surface.

  Further, in the technique proposed in Patent Document 3, heat and pressure are applied to the light curable fiber reinforced resin sheet after application to the area where the repair is necessary, and then the resin sheet is adhered and then ultraviolet rays are cured for curing. However, in the case where the enforcement site is a large-area wall or ceiling, it is necessary to make it difficult to adhere while applying heat or pressure, or to cure the sheet after bonding. In particular, it is necessary to carry around the ultraviolet irradiation device, and work on a large area ceiling or wall surface is burdensome because the device is directed to a high place and irradiated with ultraviolet rays, which may be dangerous.

  Moreover, when the surface asperity of the target structure to be repaired is large, in each of the above-described techniques, it is difficult to bond the repair / reinforcement sheet in accordance with the surface asperity.

  The present invention has been made to solve the above-mentioned problems, and its object is to attach a sheet for repair or reinforcement to a target structure such as concrete, the surface of the sheet for the target structure. It is an object of the present invention to provide a repair or reinforcement method which can be temporarily fixed according to unevenness and which can easily repair or reinforce a target structure, and a repair or reinforcement adhesive sheet used for the method.

  (1) A repair or reinforcement method according to the present invention for solving the above problems is a method of repairing or reinforcing a target structure using an adhesive sheet, and includes an adhesive layer and a repair or reinforcement member. Preparing an adhesive sheet comprising the step of irradiating the adhesive sheet with ionizing radiation or irradiating the adhesive sheet with ionizing radiation contained in natural light or artificial light to initiate curing of the adhesive layer And the step of bonding the tacky bonding layer to the target structure after starting the curing, and in the bonding step, heating is performed simultaneously with the bonding, or heating is performed after the bonding. , Is characterized.

  In the repairing or reinforcing method according to the present invention, in the bonding step, pressing can be performed together with the heating.

  In the repair or reinforcement method according to the present invention, curing of the tacky-adhesive sheet after being bonded to the target structure can be configured to proceed at the environmental temperature of the target structure.

  In the repair or reinforcement method according to the present invention, the repair or reinforcement member may be configured to be included in the inside of the pressure-sensitive adhesive layer or provided on one surface of the pressure-sensitive adhesive layer.

  In the repair or reinforcement method according to the present invention, the irradiation of ionizing radiation or the irradiation of ionizing radiation contained in natural light or artificial light in the step of starting the curing is configured to be performed from at least one adhesive layer side. May be

  (2) The pressure-sensitive adhesive sheet according to the present invention for solving the above problems is characterized by being used in the method according to the present invention.

(3) A tackiness adhesive sheet according to the present invention for solving the above problems is a tackiness adhesion sheet which is attached to a target structure to repair or reinforce the target structure,
An adhesive layer comprising an ionizing radiation curable resin and a compound that receives ionizing radiation and releases a polymerization initiator;
A release film provided on at least one side of the pressure-sensitive adhesive layer;
And a repair or reinforcement member provided in the adhesive layer or on one surface of the adhesive layer,
The release film or the repairing or reinforcing member disposed on the opposite surface of the side to be bonded to the target structure has heat resistance.

  In the pressure-sensitive adhesive sheet according to the present invention, the heat-resistant release film or the repair or reinforcing member is disposed against heating when the pressure-sensitive adhesive sheet is attached to the target structure, or It can be configured to be arranged against pressure applied with heating.

  In the pressure-sensitive adhesive sheet according to the present invention, the compound can be configured such that the release of the polymerization initiator after receiving the ionizing radiation proceeds at a normal environmental temperature of the target structure.

  In the pressure-sensitive adhesive sheet according to the present invention, the repair or reinforcing member is included in the inside of the pressure-sensitive adhesive layer or provided on one side of the pressure-sensitive adhesive layer. It is also good.

  According to the present invention, when bonding a sheet for repair or reinforcement to a target structure such as concrete, the sheet can be temporarily fixed according to the surface unevenness of the target structure, and the repair or reinforcement of the target structure can be performed. The repair or reinforcement method which can be performed easily, and the adhesive sheet for repair or reinforcement used for the method can be provided. As a result, among the problems relating to the maintenance of social infrastructure, the repair or reinforcement work of many social infrastructures requiring repair or reinforcement such as, for example, tunnels and buildings can be largely omitted and performed in a short time. Can. In particular, it can be preferably applied to a target structure having relatively large surface irregularities.

A pressure-sensitive adhesive layer (A) provided with a repair or reinforcing member, a repair or reinforcing pressure-sensitive adhesive sheet (B) provided with a release film on one side of the pressure-sensitive adhesive layer, and peeling on both sides of the pressure-sensitive adhesive layer It is a typical sectional view showing a repair or reinforcement tackiness adhesive sheet (C) which provided a film. Adhesive sheet for repair or reinforcement (A) comprising release sheet, adhesive layer and repair or reinforcement member, adhesive sheet for repair or reinforcement (B) comprising adhesive layer and repair or reinforcement member It is a typical sectional view showing. It is a typical sectional view showing an example of a tackiness or repair sheet having at least a tackiness adhesive layer and a repair or reinforcing member.

  Hereinafter, the repair or reinforcing method according to the present invention and the tacky adhesive sheet for repair or reinforcement will be described. The present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist thereof.

[Repair or reinforcement method]
The repair or reinforcement method according to the present invention is a method for repairing or reinforcing a target structure using the adhesive sheet 10 for repair or reinforcement, an example of which is shown in FIGS. 1 to 3. And the characteristic is the process (preparation process) of preparing the adhesive sheet 10 provided with the adhesive layer 2 and the repair or reinforcement member 3 and irradiating the ionizing radiation to the adhesive sheet 10 or A process of starting the curing of the adhesive layer 2 by irradiation with ionizing radiation contained in natural light or artificial light (curing start process), and a process of bonding the adhesive layer 2 to the target structure after the curing is started (Lamination process) In the lamination process, it is heating at the same time as lamination, or heating after laminating.

  This method targets the adhesive layer 2 after the adhesive sheet 10 is irradiated with ionizing radiation or ionizing radiation contained in natural light or artificial light is started to cure the adhesive layer 2. Stick to the structure. Then, after the bonding, the hardening of the tacky-adhesive sheet 10 after bonding to the target structure proceeds at the environmental temperature of the target structure, so no special curing treatment is performed, and intentional Do not perform any curing work. Therefore, the adhesive sheet 10 can be bonded to the target structure while the adhesive sheet 10 is bonded to the target structure and left as it is and the next operation or setup is performed. In particular, in the step of bonding, since the heating is performed simultaneously with the bonding or the method of heating after the bonding is performed, there is an advantage that the adhesive sheet 10 can be temporarily fixed according to the surface unevenness of the target structure. As a result, the work of repair or reinforcement (abbreviated as repair / reinforcement) of the target structure having a relatively large surface unevenness can be efficiently performed in a well-planned manner, and the total working time can be shortened. With such energy-saving methods, especially in repair and reinforcement work for target structures such as tunnels and buildings, it is necessary to repair and reinforce in a short time with well-prepared places such as narrow places and high places. It is possible to carry out repair / reinforcement work efficiently for target structures with relatively large surface irregularities, such as traffic restriction and work at night, tunnel work at night, and railway work at night.

  Hereinafter, the repair / reinforcement method using the adhesive sheet will be described in detail. In the present invention, the term "repairing" means to hide cracks in the target structure or to eliminate unevenness, and "reinforcement" means to improve strength, improve water retention, surface protection, decoration, etc. It means giving a function, and further, giving such a function while performing the above-mentioned repair is also included.

(Target structure)
The target structure is the target of repair and reinforcement, and it is a bridge, tunnel, road pavement, river management facility, sabo dam, sabo floor solid construction, sewer pipe beam, sewage treatment plant, port facility, public housing, collective Many social infrastructures can be mentioned such as houses, homes, urban parks, coastal levees, airports, airports, navigation signs, government facilities and so on. The adhesive sheet 10 according to the present invention can be applied to these target structures. Moreover, it is applicable also to the object structure with a large surface unevenness | corrugation. Such surface irregularities can be measured by a portable surface roughness meter or the like. Below, a tunnel will be described as an example of a target structure, and concrete will be described as an example of an object.

[Preparation process]
The preparing step is a step of preparing the pressure-sensitive adhesive sheet 10 including the pressure-sensitive adhesive layer 2 and the repair or reinforcement member 3 (hereinafter, referred to as a repair / reinforcement member). When the adhesive layer 2 is irradiated with ionizing radiation such as ultraviolet rays, the adhesive layer 2 is a layer that gradually cures at the ambient temperature around the target structure to which the adhesive sheet 10 is bonded (this temperature is referred to as “normal ambient temperature”). It is a delayed curing type tacky-adhesion layer in which curing proceeds gradually and adheres without the application of an aggressive curing means thereafter. By using the pressure-sensitive adhesive sheet 10 having such a delayed curing type pressure-sensitive adhesive layer 2, efficient bonding work and repair / reinforcement work can be performed. The “normal ambient temperature” is in a temperature range in which the worker can work, and for example, in a range of about −5 ° C. or more and 45 ° C. or less. In addition, the detailed description about the adhesive sheet 10 is mentioned later.

(Curing start process)
The curing start step is a step of irradiating the adhesive sheet 10 with ionizing radiation to start curing of the adhesive layer 2. Alternatively, the adhesive sheet 10 is irradiated with ionizing radiation contained in natural light or artificial light to initiate curing of the adhesive layer 2. Then, the irradiation of ionizing radiation or the irradiation of ionizing radiation contained in natural light or artificial light in this curing start step is performed from at least one side of the pressure-sensitive adhesive layer.

  Irradiation of ionizing radiation such as ultraviolet rays and electron beams does not have to be performed after the adhesive sheet 10 is bonded as in the conventional case, but is performed on the adhesive sheet 10 before being bonded. Therefore, ionizing radiation can be irradiated on the flat or wide area of the work place. For example, a stationary ionizing radiation irradiating apparatus can be placed at a work site, and the adhesive sheet 10 can be irradiated with the ionizing radiation by roll roll. Alternatively, the adhesive sheet 10 may be placed in a work place, and the adhesive sheet 10 may be irradiated using, for example, a hand-held ionizing radiation irradiation apparatus. Moreover, when there is no specific ionizing radiation irradiation apparatus (for example, ultraviolet irradiation apparatus etc.), sunlight etc. may be sufficient, and "ionizing radiation" in the present application includes ionizing radiation such as ultraviolet light contained in sunlight etc.

Among the irradiation conditions of ionizing radiation, the irradiation conditions when irradiating with ultraviolet rays differ depending on the type of curing agent. For example, as in the examples described later, the integrated light amount is 50 mJ / cm ² in the wavelength region of 300 nm to 370 nm. The above irradiation conditions can be mentioned. In particular, from the viewpoint of showing high physical properties after curing, irradiation conditions of about 500 mJ / cm ² or more and 2000 mJ / cm ² or less are preferable. Moreover, although the conditions in the case of irradiating an electron beam also change with kinds of hardening | curing agent, the irradiation conditions of the grade of 50 kGy or more and 100 kGy or less can be mentioned.

  It is necessary that the tacky adhesive sheet 10 after irradiation with ionizing radiation be rapidly cured so that the tackiness of the tacky adhesive sheet 10 does not disappear before bonding. That is, while performing the work of bonding the pressure-sensitive adhesive sheet 10 in the bonding step described later, the adhesive sheet 10 must have adhesiveness. Since such working time is usually on the order of 30 seconds or more and 24 hours or less, it is preferable that the curing be completed and the tackiness not be lost at least within the time range.

  Irradiation of ionizing radiation contained in natural light or artificial light may be performed by actively exposing natural light or artificial light for irradiation, or indirectly as a result without intentionally irradiating. May be In addition, natural light is sunlight etc., and artificial light is indoor fluorescent lamp, LED, a metal high ride lamp, a black light etc.

  The tackiness which can be bonded together is preferably in the range of at least 0.01 N / inch or more and 50 N / inch or less, as evaluated by the tackiness to aluminum. "At least" is a meaning that it is the range that is the adhesive power that can be bonded to the target structure and hold the bonded state if it has the minimum adhesive strength, and the upper limit is even larger It may be a value. And while having the adhesive force of this range, the adhesive sheet 10 can be preferably bonded together with respect to a target structure. Since the change of the adhesive strength of the adhesive sheet 10 after the ionizing radiation irradiation does not occur rapidly, the adhesive strength within the above range can be evaluated as the adhesive strength before the ionizing radiation irradiation. In addition, it is preferable that adhesive force exists in the range of 5 N / inch or more and 30 N / inch or less from a viewpoint that it can temporarily temporarily stick and can re-paste.

  Therefore, the tackiness of the adhesive sheet 10 to be subjected to the curing start step is at least 0.01 N / inch or more and 50 N / inch or less before irradiation with ionizing radiation, natural light and the like, and the tackiness thereof is at least It is desirable to hold for 30 seconds or more and 24 hours or less. Using the adhesive sheet 10 having such adhesion characteristics and adhesion retention characteristics, it is irradiated with ionizing radiation or is irradiated with ionizing radiation contained in natural light or artificial light to start curing, and thereafter for the target structure Therefore, it is possible to perform an efficient bonding operation with good workability.

(Bonding process)
The bonding step is a step of bonding the pressure-sensitive adhesive sheet 10 to the target structure after the hardening of the pressure-sensitive adhesive layer 2 is started. After this bonding step, ionizing radiation is not positively irradiated or heat-treated positively. In other words, the adhesive sheet 10 after being irradiated with ionizing radiation and bonded to the target structure is intentionally processed after the bonding process because the curing proceeds at the environmental temperature of the target structure. Do not perform any curing work. Therefore, the adhesive sheet 10 is bonded to the target structure while the adhesive sheet 10 is gradually cured over time while the next work or setup is performed while the adhesive sheet 10 is bonded to the target structure. can do. As described above, the bonding time is usually 30 seconds or longer and 24 hours or shorter. Within the time of this bonding operation, it is desirable that the tackiness of the tackiness adhesive sheet 10 subjected to the curing initiation process is not significantly reduced. The adhesion to be held during bonding is desirably within the range of 0.01 N / inch or more and 50 N / inch or less before irradiation with ionizing radiation, as described above. The pressure-sensitive adhesive sheet 10 having an adhesive strength in this range after the curing treatment can be attached well to the target structure.

  In this bonding step, heating is performed simultaneously with bonding of the tacky-adhesive sheet 10 subjected to the ionizing radiation irradiation, and the tacky-adhesive sheet 10 which is not positively irradiated with the ionizing radiation but indirectly irradiated with sunlight or the like. Or it heats, after bonding the adhesive sheet 10 together. Heating at the same time as bonding or heating after bonding is advantageous in that the pressure-sensitive adhesive sheet 10 can be temporarily fixed according to the surface unevenness of the target structure. By this heating, the adhesive layer 2 constituting the adhesive sheet 10 is softened, and the softened adhesive layer 2 follows the shape of the surface irregularities of the target structure. By such a follow-up, the pressure-sensitive adhesive layer 2 can be attached according to the surface irregularities. As a result, high adhesion performance can be maintained.

  As the heating means, a heating structure such as a so-called iron may be used, or a hot air blower such as a so-called industrial dryer may be used. The heating structure may be a rotating roll-like structure or a non-rotating iron-like structure. Note that the heating structure may have a hot air blowing function.

  The heating here is to soften the pressure-sensitive adhesive layer 2, so that the heating may be performed as much as possible to achieve the purpose, and it is not necessary to cure by the heating. As heating sufficient to soften the adhesive layer 22, a heating temperature and a heating time are arbitrarily set according to the characteristics and thickness of the adhesive layer 2 to be softened. As an example of the heating temperature, a temperature within the range of 50 ° C. or more and 250 ° C. or less can be mentioned, and as an example of the heating time, a time within the range of 0.1 seconds or more and 30 seconds or less can be mentioned it can. The heating here may be performed temporarily for such a short time, and is not strictly defined.

  A pressurization may be performed together with the heating. Pressurization is preferable in that the adhesive layer 2 softened by heating can follow the shape of the surface irregularities. The pressurizing method can be performed by pressing a roll-like structure or a trowel-like structure used as the heating means described above. When using a hot air blower, use a roll-like structure or a iron-like structure without heating means, and press the roll-like structure or iron-like structure immediately after the hot air is applied to the adhesive layer 2 It can be pressurized. In addition, pressure may be applied by hand without using the roll-like structure or the iron-like structure. The pressure is not particularly limited as long as the pressure-sensitive adhesive layer 2 can follow the shape of the surface irregularities.

  Heating and pressing are preferably performed from the heat-resistant release film side provided on the adhesive sheet 10, and the heating means and pressurizing means are pressed against the heat-resistant release film side or blown. . Although the pressure-sensitive adhesive sheet 10 is provided with the pressure-sensitive adhesive layer 2 to be bonded to the target structure, since the heating and pressure can not be directly applied to the pressure-sensitive adhesive layer 2, from the peeling film side However, as the release film, it is desirable to carry out from the side provided with a heat resistant release film. As described above, the heat-resistant release film is disposed for heating when the pressure-sensitive adhesive sheet 10 is bonded to the target structure, or is disposed for pressure applied with the heating. .

  In the case where the heat-resistant peeling film is not provided on the tacky adhesive sheet 10 and the repair / reinforcement member 3 is provided instead, heat or pressure is applied from the repair / reinforcement member 3 side. It can be carried out. In this case, the heating means or the pressurizing means is pressed against the repair / reinforcing member 3 side or blown. When a heating means or a pressure means is applied directly to the repair / reinforcement member 3, the repair / reinforcement member 3 is arranged against the heating when the adhesive sheet 10 is bonded to the target structure. It is desirable to be arranged with respect to the pressure applied with the heating or the heating thereof, and to have heat resistance.

(Lamination of each adhesive sheet)
Each adhesive sheet 10 shown in FIGS. 1 to 3 can be bonded by the following bonding means after, for example, irradiation with ionizing radiation in advance to start curing.

  The pressure-sensitive adhesive sheet 10A shown in FIG. 1B is a pressure-sensitive adhesive sheet in a mode in which the repair / reinforcement member 3 is impregnated in the pressure-sensitive adhesive layer 2. In this adhesive sheet 10A, first, the surface S1 of the side to be bonded to the target structure such as concrete is bonded to the target structure, and heating is performed (or may be further pressed) simultaneously with this bonding or after bonding. Then, the heat-resistant release film 1 provided on the opposite surface S2 can be peeled off and then applied. On the other hand, the adhesive sheet 10 B shown in FIG. 1C is also an adhesive sheet in which the repair / reinforcement member 3 is impregnated in the adhesive layer 2. In this adhesive sheet 10C, first, peel off the peelable film 1 'on the surface S1 on the side to be attached to the target structure, attach the exposed adhesive layer 2 to the target structure, and simultaneously or After combining, heating (you may pressurize further) is carried out, and after that, the heat-resistant peeling film 1 provided in the surface S2 on the opposite side can be peeled off and can be applied. In the adhesive sheets 10A and 10B shown in FIGS. 1 (B) and 1 (C), other members such as a protective member, a cover member, and other repair / reinforcement members may be attached to the exposed adhesive layer 2. it can.

  An adhesive sheet 10 </ b> C illustrated in FIG. 2A is an adhesive sheet in which the repair / reinforcing member 3 is bonded to one surface S <b> 2 of the adhesive layer 2. In this adhesive sheet 10C, the peeling film 1 on the surface S1 on the side to be attached to the target structure is peeled off, the exposed adhesive layer 2 is attached to the target structure, and simultaneously or after this attachment. It can be applied by heating (further pressurization). Since the repair / reinforcement member 3 adheres to the adhesive / adhesive layer 2 in advance, the adhesive / adhesive sheet 10C can be easily applied. On the other hand, the adhesive sheet 10D shown in FIG. 2B is also an adhesive sheet in which the repair / reinforcement member 3 is attached to one surface S2 of the adhesive layer 2, and is attached to the target structure The surface S1 of the above can be bonded to the target structure, and the bonding can be performed simultaneously with or after the bonding, by heating (or further pressing). Since the repair / reinforcement member 3 adheres to the adhesive / adhesive layer 2 in advance, the adhesive / adhesive sheet 10D can be easily applied.

  The adhesive sheet 10E shown in FIG. 3A is an adhesive sheet in which the adhesive layers 2 and 2 'are attached to both sides of the repair / reinforcement member 3. In this adhesive sheet 10E, similarly to the adhesive sheet 10C described above, the release film 1 provided on the surface S1 on the side to be bonded to the target structure is peeled off, and the exposed adhesive layer 2 is applied to the target structure. It can be applied by heating (which may be further pressurized) at the same time as or after bonding. After that, the heat-resistant peelable film 1 'can be peeled off as needed, and a functional sheet or layer can be provided on the exposed pressure-sensitive adhesive layer 2'. On the other hand, the adhesive sheets 10F and 10G shown in FIGS. 3B and 3C are also adhesive sheets in which the adhesive layers 2 and 2 'are attached to both sides of the repair / reinforcement member 3. In the adhesive sheets 10F and 10G, similarly to the adhesive sheet 10D described above, the surface S1 on the side to be attached to the target structure is attached to the target structure, and heating is performed simultaneously with this attachment or after attachment. (It may be further pressurized) and can be applied. Since a heat-resistant peelable film is not provided in the tacky-adhesive sheet 10F shown in FIG. 3 (B), a heating means and a pressing means are generally applied without contact. Further, since the adhesive layer 2 ′ is provided similarly to the adhesive sheet 10 </ b> E shown in FIG. 3A, a functional film or layer can be provided on the adhesive layer 2 ′.

  In this way, the repair / reinforcement member 3 is adhered to the target structure using the adhesive sheets 10A to 10G. In that case, when not using together the above pressurizing means, it is preferable to pressure-bond the adhesive layer 2 to a target structure with a roller etc. after that. Since the curing of the adhesive and pressure sensitive adhesive layer 2 has already started, it is not necessary to apply the curing means more positively, but it is also possible to heat the roller at the time of pressing to simultaneously perform pressing and heat curing. In addition, curing may be further promoted by blowing warm air after roller pressure bonding.

It is preferable that the adhesive strength after the adhesive sheet 10 is bonded to a target structure having relatively large surface irregularities and further cured is 0.5 N / mm ² or more. It is possible to effectively repair and reinforce a target structure having relatively large surface irregularities.

  A repair / reinforcement member 3 shown in FIG. 1 is a repair / reinforcement member to which a delayed curing type adhesive is applied and can be impregnated in the adhesive. Moreover, you may stick the adhesive layer 2 together like the repair and reinforcement member 3 shown in FIG.2 and FIG.3. Examples of such repair / reinforcement member 3 include aramid fibers, carbon fibers, vinylon fibers, and PET fibers for reinforcement applications. Moreover, in the repair application which can provide a function, the billboard for advertisement, a paint film, a waterproof sheet, a water absorption sheet, an ultraviolet ray resistant sheet, a water holding sheet, a colored sheet etc. can be mentioned. Reinforcement includes repair that hides cracks and removes unevenness, and also includes those that impart functions such as strength improvement, water retention, surface protection, and decoration.

  Note that a primer may be applied to the target structure before the adhesive sheet 10 is bonded to the target structure. The primer applied at this time works to adhere the adhesive layer 2 on the target structure with good adhesion. As such a primer, Alpron W301 manufactured by Japan-US Resin Co., Ltd., Primer II for reinforced concrete manufactured by Mizutani Paint Co., Ltd., etc. can be mentioned, and the primer is applied to obtain a range of about 1 μm to 1 mm. It can be applied in thickness.

  As explained above, the adhesive sheet 10 including the delayed-curable adhesive layer 2 and the repair / reinforcement member 3 is used, and the adhesive sheet 10 is used as the target structure in bonding. Since temporary fixing can be performed according to the surface unevenness, the repair or reinforcement operation of the target structure having a relatively large surface unevenness can be largely omitted, and can be performed in a short time. In addition, irradiation of ionizing radiation in the curing start step is performed from at least one of the visco-adhesive layer side (for example, for the visco-adhesive layer 2 on the side of the visco-adhesive sheet 10 to be bonded to the target structure For example, even if the repair / reinforcement member 3 having no light transmittance is included, it can be easily bonded. In addition, since ionizing radiation such as ultraviolet light can be applied to the adhesive sheet 10 by roll roll, there is an advantage that it is not necessary to perform irradiation work of ionizing radiation in high places and narrow places as in the prior art. .

Adhesive sheet
The adhesive sheet 10 used by said method is demonstrated. The adhesive sheet 10 is an adhesive sheet that is bonded to a target structure to repair and reinforce the target structure. And the characteristic is that the adhesive and pressure sensitive adhesive layer 2 containing the ionizing radiation curable resin and the compound which releases the polymerization initiating material upon receiving the ionizing radiation, and the peeling film 1 provided on at least one surface of the adhesive and pressure sensitive adhesive layer 2 A peeling film or repair that has a repair / reinforcement member 3 provided in the adhesive layer 2 or on one surface of the adhesive layer 2 and is disposed on the opposite side of the side to be bonded to the target structure The reinforcing member 3 has heat resistance.

(Adhesive layer)
The adhesive and pressure-sensitive adhesive layer 2 is an ionizing radiation curable resin that is cured by ionizing radiation, and is formed of a resin that has a property of being softened by a heating unit performed simultaneously with or after bonding. The adhesive layer 2 composed of such a resin is softened by the heating means performed at the same time as or after the bonding, and the softened adhesive layer 2 is in the shape of the surface unevenness of the target structure. Follow along. By such follow-up, the adhesive layer 2 can be applied in conformity with the surface irregularities. As a result, high adhesion performance can be maintained. The tack-bond layer 2 made of such a resin is the tack-bond layer 2 to be bonded to the target structure, and as shown in FIG. 3, for example, the tack-bond layer 2 'on the side not to be bonded to the target structure. Is not an essential configuration, but is optional.

  The composition for forming the adhesive layer 2 is not particularly specified as long as it is a resin having Tg. Examples thereof include ionizing radiation curable acrylic resins, liquid epoxy resins, solid epoxy resins and the like, and curing agents for ionizing radiation curable resins.

  Examples of the resin having such characteristics include a resin containing one or both of an ionizing radiation curable liquid epoxy resin and a solid epoxy resin and further containing a curing agent for the ionizing radiation curable resin. Since the adhesive layer 2 containing such a resin component is an adhesive layer that is delayed and cured even when irradiated with ionizing radiation, it can be bonded to the target structure with an adhesive force before irradiation with ionizing radiation. As a result, after the irradiation with ionizing radiation, the adhesive sheet 10 can be bonded to the target structure through the adhesive layer 2. Moreover, since the adhesive layer 2 has not yet been sufficiently cured by delayed curing, after the adhesive sheet 10 is bonded to the target structure, the adhesive sheet 10 can be peeled off and bonded again. It is. Since the tackiness layer 2 has adhesion performance and adhesion performance, the tackiness sheet 10 is targeted via the tackiness layer 2 even if the target structure surface is a vertical surface or a ceiling surface. Can be attached to a structure.

  The pressure-sensitive adhesive layer 2 is pasted so that one surface adheres to the target structure. In addition, another member (a protective member, a cover member, another repair / reinforcement member, or the like) is bonded to the other surface. In the present application, "adhesive" means having both adhesion performance and adhesion performance, and adhesion is used as meaning temporary adhesion phenomenon, whereas adhesion means permanent adhesion phenomenon. It may be distinguished by the point used as a thing (Iwanami Shoten RIKEN Dictionary 5th edition).

  The adhesive layer 2 is a layered or sheet-like composition for forming an adhesive layer, and is usually provided on the release film 1 like an adhesive sheet 10 described later. The composition for forming an adhesive layer is a resin composition for forming the adhesive layer 2 by coating or the like. Although this adhesive layer composition can mix | blend various resin, it can be comprised with the component for adhesive layer formation. Examples of such components include epoxy resins such as ionizing radiation curable acrylic resins, liquid epoxy resins, solid epoxy resins, etc., and curing agents for ionizing radiation curable resins.

  The adhesive layer 2 contains a chemical species that enables delayed curing as a delayed curing means. As such delayed curing means, various means are conceivable, but in the present application, there can be mentioned delayed curing means performed with a chemical species that receives ionizing radiation and releases a polymerization initiator.

  Among these delayed curing means, examples of chemical species that release polymerization initiators by receiving ionizing radiation include chemical species in which a curing accelerator (eg, base) is gradually generated by ionizing radiation, such as a photobase generator. be able to.

  The photobase generator is a chemical species in which a base that is a curing accelerator is gradually generated by ionizing radiation. For example, it is preferable that the base be generated by irradiation with ionizing radiation such as ultraviolet rays or electron beams, which is represented by the following chemical formula.

In the photobase generator, R ¹ and R ² are each independently hydrogen or a monovalent organic group in the following chemical formula, and may be the same or different. R ¹ and R ² may be combined to form a cyclic structure. However, at least one of R ¹ and R ² is a monovalent organic group. R ³ , R ⁴ , R ⁵ and R ⁶ are each hydrogen, halogen or a monovalent organic group, and may be the same or different. Two or more of R ³ , R ⁴ , R ⁵ and R ⁶ may be bonded to form a cyclic structure.

Such a photobase generator is irradiated with ionizing radiation such as ultraviolet light and electron beam to generate a base, and generation of the base is promoted. Therefore, the base can be efficiently generated by the irradiation of ionizing radiation. The photobase generator refers to an agent that does not exhibit activity under normal conditions of normal temperature and pressure, but generates a base when ionizing radiation is applied as an external stimulus. Since the photobase generator has the above-mentioned specific structure, when irradiated with ionizing radiation, the (-CH = CH-C (= O)-) moiety in the chemical formula is isomerized to a cis form and cyclized, The base amine NHR ¹ R ² is generated.

  When the curing agent that cures the adhesive layer 2 by irradiating ionizing radiation is a curing agent that starts cationic polymerization by irradiation of ionizing radiation, the content is, for example, 1% by mass or more with respect to the epoxy resin It is preferable that it is 10 mass% or less. The content of epoxy resin such as phenol type curing agent and acid anhydride type curing agent and curing agent of equivalent reaction type is 0.8 equivalent or more, for example, with respect to epoxy equivalent of epoxy resin. It is preferably 1.2 equivalents or less. Moreover, it is preferable that content in the case of using the curing catalyst in the equivalent reaction system of the epoxy resin of a photobase generator together is 0.5 mass% or more and 10 mass% or less with respect to an epoxy resin, for example .

  The adhesive and bonding layer 2 may be, for example, a coupling agent for improving the adhesion between the target structure and the adhesive and bonding layer 2, and an adhesive and / or adhesive, as needed, as long as the object of the present invention is not impaired. Various additives such as a leveling agent for improving the coating properties of the layer forming composition may be included. Further, a tackifier may be included to increase the adhesive strength, and a filler or the like may be included to improve the shear strength.

  The thickness of the adhesive layer 2 is preferably 150 μm or more and 500 μm or less, and more preferably 150 μm or more and 300 μm or less.

  The adhesive layer 2 is provided on the release film 1 that has been subjected to easy release treatment. The release film 1 will be described in detail in the column of the adhesive sheet 10 described later.

  The composition for forming an adhesive layer is prepared by blending, stirring and dissolving the above-described raw materials. The stirrer used for stirring is not particularly limited, and a common kneading and dispersing machine, such as a two-roll mill, a three-roll mill, a pebble mill, a toron mill, a high speed impeller disperser, a high speed stone mill, a high speed impact mill, a disper, a high speed mixer, A ribbon blender, a co-kneader, an intensive mixer, a tumbler, a blender, a disperser, a homogenizer, an ultrasonic disperser, etc. can be applied.

  The application method of the composition for forming an adhesive and pressure-sensitive adhesive layer is also not particularly limited. Examples of the formation method by printing include a gravure printing method, a flexographic printing method, an offset printing method, and the like. Examples of the coating method include roll coating, reverse coating, comma coating, knife coating, die coating, and gravure coating.

  Drying of the composition for forming an adhesive layer after being applied can sufficiently volatilize the solvent contained in the composition for forming an adhesive layer, and the curing of the ionizing radiation curable resin is excessive. It is preferable to carry out the reaction under such a condition that the adhesion performance is not deteriorated by the acceleration. As drying conditions, it is usually carried out by holding at a temperature of 50 ° C. or more and 100 ° C. or less for 2 minutes or more and 20 minutes or less.

(Form of adhesive sheet)
For example, as shown in FIGS. 1 (B) and (C) and FIG. 2 (A), the adhesive sheet 10 (10A, 10B, 10C) includes the adhesive layer 2 described above and the adhesive layer 2 thereof. And a release film 1 provided on one side (S1 or S2). This adhesive sheet 10 may be adhesive sheets 10A and 10C in which the release film 1 is provided only on one side S2, and release films 1 and 1 'are provided on both sides S1 and S2. The adhesive sheet 10B may be used. Among these, the adhesive sheets 10A and 10B shown in FIGS. 1 (B) and (C) include the repair / reinforcement member 3 in the adhesive layer 2. In such adhesive sheets 10A and 10B, it is desirable that the peeling film disposed on the side to which the heating means and the pressurizing means are applied at the time of construction be heat resistant.

  Moreover, as shown, for example to FIG. 2 (A) (B), the adhesive sheet 10 (10C, 10D) was provided in above-mentioned adhesive layer 2 and single-sided S2 of the adhesive layer 2. And a repair / reinforcement member 3. This adhesive sheet 10 may be an adhesive sheet 10C in which the repair / reinforcement member 3 is provided on one surface S2 of the adhesive layer 2, and the release film 1 is provided on the other surface S1. The adhesive / adhesive sheet 10D may be provided with the repair / reinforcement member 3 on one surface S2 of the adhesive / adhesive layer 2 and nothing provided on the other surface S1. In such adhesive sheets 10C and 10D, it is desirable that the repair / reinforcement member 3 disposed on the side to which the heating means and the pressurizing means are applied at the time of construction be heat resistant.

  The adhesive sheets 10 (10E, 10F, 10G) are, for example, the adhesive sheets 10C, 10D shown in FIGS. 2A and 2B as shown in FIGS. This embodiment is an embodiment in which an adhesive layer 2 ′ is further provided on the repair / reinforcement member 3 to be configured. That is, the adhesive sheet 10 shown in FIG. 3 includes the above-described adhesive layer 2, the repair / reinforcement member 3 provided on one surface S <b> 2 of the adhesive layer 2, and the repair / reinforcement member 3. And an adhesive layer 2 ′ provided. A release film 1 'may be provided on the tacky adhesive layer 2' as shown in FIGS. 3 (A) and 3 (C), and a release film is provided as shown in FIG. 3 (B). It does not have to be. "On the repair / reinforcement member 3" means on the opposite surface of the repair / reinforcement member 3 on the side provided with the adhesive / detachment layer 2. In addition, in FIG. 3, code | symbol S2 'is a surface by the side of the repair * reinforcement member of adhesive layer 2', code | symbol S1 'is the opposite side to the repair / reinforcement member side of adhesive layer 2'. It is a face. In such adhesive sheets 10E, 10F, and 10G, it is desirable that the release film disposed on the side to which the heating means and the pressurizing means are applied at the time of construction is heat resistant.

  The pressure-sensitive adhesive layer 2 ′ may be composed of the same components as the above-mentioned pressure-sensitive adhesive layer 2 or may be composed of different components, but it is desirable from the viewpoint of production cost that the same components are used.

(Peeling film)
The peeling film 1 is provided in the single side (S1 or S2) or both surfaces (S1 and S2) of the mucoadhesive layer 2, as shown to FIG. 1 and FIG. The release film 1 covers one side (S1 or S2) or both sides (S1 and S2) of the mucoadhesive layer 2 and acts to protect the mucoadhesive layer 2 until use. The peeling film 1 may be provided on the opposite surface S2 of the surface S1 on the side to be bonded to the target structure among the surfaces S1 and S2 of the adhesive and pressure-sensitive adhesive layer 2 as shown in FIG. 1 (B) Alternatively, as shown in FIG. 1C, it may be provided on both the surface S2 and the surface S1 on the side to be bonded to the target structure. When such a release film is disposed on the side to which a heating means or a pressing means is added at the time of application, it is desirable that the release film be heat resistant.

  Moreover, as shown to FIG. 2 (A) and FIG. 3 (A), the peeling film 1 is provided in surface S1 of the side bonded to a target structure among surfaces S1 and S2 of the adhesion layer 2. May be Further, as shown in FIGS. 3 (A) and 3 (C), when the tackiness layer 2 'is provided on the repair / reinforcement member 3, the peeling film 1' is provided on the tackiness layer 2 '. It may be done. When such a release film is disposed on the side to which a heating means or a pressing means is added at the time of application, it is desirable that the release film be heat resistant.

  It is preferable that the surface on the side of the pressure-sensitive adhesive layer of the release film 1 is subjected to an easy release treatment. The peelable film 1 subjected to the easily peelable treatment can be easily peeled from the sticky and adhesive layer 2 after, for example, the sticky and adhesive layer 2 included in the tacky and adhesive sheet 10 is bonded to the target structure.

  The release film 1 is not particularly limited as long as the release film 1 is provided on the surface of the mucoadhesive layer 2 so as to be peelable and has sufficient strength and flexibility to protect the mucoadhesive layer 2. A film can be used.

  The heat resistance of the heat-resistant release film is such that the heat within the range of about 50 ° C. or more and 250 ° C. or less is temporarily applied to the release film without melting or sticking to the heating structure, There is no particular limitation as long as the heat resistance is such that the peeling performance is not lost or not.

(Repair / reinforcement member)
As shown in FIG. 1, the repair / reinforcement member 3 may be one in which a delayed-curing adhesive is applied and impregnated in the adhesive, or in FIGS. 2 and 3. As shown, it may be bonded to the adhesive layer 2.

  Examples of the repair / reinforcement member 3 include one or more selected from polyester fibers, polyamide fibers, aramid fibers, vinylon fibers, carbon fibers, glass fibers, polyolefin fibers, and the like. Among these, polyester fiber, polyamide fiber, aramid fiber, vinylon fiber, and polyolefin fiber are preferably used because they are light and excellent in strength. These fibers may be blended, used separately for warps and wefts, or may be laminated in multiple layers. Reinforcement includes repair that hides cracks and removes unevenness, and also includes those that impart functions such as strength improvement, water retention, surface protection, and decoration. In addition, in the repair / reinforcement member 3, for example, in the adhesive sheets 10C and 10D shown in FIGS. 2A and 2B, the repair / reinforcement member 3 disposed on the side to which the heating means and the pressurizing means are added at the time of construction is It is desirable to be heat resistant.

  Further, a sheet-like member such as a waterproof sheet, a water-absorbing sheet, an ultraviolet-resistant sheet, a water-retaining sheet, or a colored sheet may be used as the repair / reinforcement member 3, or such a sheet-like repair / reinforcement member and a fibrous repair / reinforcement. It may be a composite of members.

  Such a repair / reinforcement member 3 can support a peeled target structure piece or a target structure piece that is likely to be peeled, when there is a risk of peeling or peeling of a part of the target structure. It is preferable to have strength (reinforcing strength). The strength may be, for example, 1500 N or more at a displacement of 10 mm or more in a push-out test prescribed by the former Japan Highway Public Corporation (East Japan Expressway Co., Ltd., Central Japan Expressway Co., Ltd., West Japan Expressway Co., Ltd.) preferable.

  The thickness of the repair / reinforcement member varies depending on whether it is used for repair or for reinforcement, but is usually in the range of 0.01 mm or more and 1.0 mm or less.

(Others)
Like the adhesive sheet 10 (10E, 10F, 10G), the adhesive / adhesive layer (2, 2 ′) can be provided on both sides of the repair / reinforcing member 3, so that it can function like a double-sided tape. it can. The surface S1 of the adhesive and pressure-sensitive adhesive layer 2 of the adhesive and pressure-sensitive adhesive sheet 10 can be bonded to a target structure, and a functional sheet or layer to be described later is attached to the surface S1 ′ of the adhesive and pressure-sensitive adhesive layer 2 ′. Can be matched. The adhesive sheets 10E and 10G may be provided with functional sheets or layers in place of the release film 1 '.

  Examples of the functional sheet or layer include one or more functions such as light resistance, water resistance, antifouling properties, weather resistance, impact resistance, scratch resistance, acid resistance, alkali resistance, and design properties. And sheets or layers having

  As described above, the adhesive sheet according to the present invention is an adhesive sheet 10 that is bonded to a target structure and repairs / reinforces the target structure, and includes an ionizing radiation curable resin and ionizing radiation. One of a pressure-sensitive adhesive layer 2 including a compound that receives the substance and releases a polymerization initiating material, a release film 1 provided on at least one side of the pressure-sensitive adhesive layer 2, and one of the pressure-sensitive adhesive layer 2 or Because the release film 1 or the repair / reinforcement member 3 disposed on the opposite surface of the side to be bonded to the target structure has heat resistance, The adhesive sheet 10 can be heated at the same time as the bonding, or can be heated after the adhesive sheet 10 is bonded. The heating at the same time as the bonding or the heating after the bonding has an advantage that the adhesive sheet 10 can be temporarily fixed according to the surface irregularities of the target structure. Further, the repair or reinforcement work of the target structure can be greatly omitted and can be performed in a short time. As a result, among the problems relating to the maintenance of social infrastructure, the repair or reinforcement work of many social infrastructures requiring repair or reinforcement such as, for example, tunnels and buildings can be largely omitted and performed in a short time. Can.

  EXAMPLES The present invention will be described more specifically with reference to examples. However, the present invention is not limited to the description of the following examples unless it exceeds the gist.

Example 1
(Target structure and adhesive sheet)
A mortar board having a center line average roughness Ra of 1 μm or less (referred to as mortar type A) was used as a target structure. The center line average roughness Ra at this time is a value measured by an evaluation method in accordance with JIS B 0601 (2013).

(Initial adhesion)
The following adhesive sheet 10 for bonding to the target structure was prepared. The adhesive layer 2 of the prepared adhesive sheet 10 was stored in a light-shielding bag because the adhesive layer 2 did not start to cure unless it received ionizing radiation. The initial adhesive strength of the pressure-sensitive adhesive layer 2 before curing began was about 17 N / inch when the aluminum slope was to be bonded. First, the prepared adhesive sheet 10 was cut into a length of 25 mm and a width of 150 mm, the release film of the adhesive sheet was peeled off, and the exposed adhesive layer was an aluminum alloy (A6061, sample: 25 mm). × 150 mm), and then the adhesive sheet was peeled off by about 20 mm by hand, and conformed to JIS Z0237 using a tensile tester (manufactured by A & D Co., Ltd., model number: RTF-1150H). The initial adhesion (N / 25 mm) to the surface of the aluminum plate was measured under the conditions (tensile speed: 300 mm / min, peeling distance: 150 mm, peeling angle: 180 °).

(Evaluation of presence of air bubbles and workability)
For an A4 size (length 297 mm, width 210 mm) adhesive sheet 10, using an ionizing radiation irradiation device (using an H bulb, manufactured by Fusion UV System Japan, trade name: DRE-10 / 12QN), a wavelength of 300 Irradiation with ultraviolet rays in a region of ˜370 nm was performed so that the integrated light amount was 800 mJ / cm ² . About the adhesive sheet 10 after irradiation, the release film (SP-PET-03) of the adhesive sheet is peeled off, and the hand roller with a heating function heated to 210 ° C. from the release film on the adhesive layer side. And bonded to a target structure (mortar seed A) having a thickness of 60 mm. The heating time at the specific point was about 2 seconds. The adhesion immediately after irradiation was measured in the same manner as above, and was the same as the adhesion before irradiation.

  After bonding to the target structure, no special curing treatment was performed, and no intentional curing operation was performed. And the presence or absence of the bubble on the surface of the object structure was confirmed. When bubbles having a diameter of 1 μm or more were present on the bonding surface, they were represented by “x”, and when there were no bubbles having a diameter of 1 μm or more on the bonding surface, “o” was given. The results are shown in Table 1.

  After bonding to the target structure, no special curing treatment was performed, and no intentional curing operation was performed. And after leaving for 7 days at 18 to 25 degreeC which is the normal temperature at the time of construction, the presence or absence of the float was evaluated. The case where the adhesive was neatly adhered and there was no floating was represented by “◯”, and the case where the floating occurred was represented by “X”. The results are shown in Table 1.

(Adhesion strength test)
As an adhesion strength test, the same adhesive sheet was bonded to the same target structure as described above under the same conditions as described above. It cut | disconnected to the magnitude | size of 40 mm in length and 40 mm in width using the concrete cutter, and evaluated by the peeling prevention performance check test (JHS 424 2004). As a result, it showed an adhesion strength of ² N / mm ² , which was a practically acceptable level.

(Adhesive sheet)
The used adhesive sheet is as follows. As a release film, a polyester film (trade name: SP-PET-03, film thickness: 38 μm, manufactured by Tosero Co., Ltd.) having a release treatment with a silicone-based release agent on one side is prepared, and the release treatment of this release sheet The surface was coated using a coating solution for forming a pressure-sensitive adhesive layer as described below, using an applicator such that the thickness after coating was 100 μm. Then, it was dried at 80 ° C. for 2 minutes in a drying oven to form an adhesive layer. Two sheets of this adhesive layer were prepared. Next, aramid fibers (trade name: AK-10 / 10, manufactured by Fivex Co., Ltd.) are attached to one surface of the obtained two adhesive layers using a 2 kg roller at room temperature. Then, using a 2 kg roller on a hot plate at about 60 ° C., the other adhesive surface was brought into contact with the aramid fiber. Thus, an adhesive sheet of Example 1 was obtained.

(Composition for forming adhesive layer)
· Liquid epoxy resin (bisphenol A type epoxy resin, epoxy equivalent: 190 g / eq., Molecular weight: 380, manufactured by Mitsubishi Chemical Corporation, trade name: jER 828) 100 parts by mass · PEMP (pentaerythritol tetrakis) as a curing agent having a mercapto group -3-mercaptopropionate, viscosity: 400 to 550 mPa · s / 25 ° C., mercaptan equivalent: 125 to 137 g / eq., Manufactured by Mitsubishi Chemical Corporation, trade name: QX40) 70 parts by mass Thermoplastic polymer (amino) Group-modified methyl methacrylate-butyl acrylate-methyl methacrylate triblock copolymer, Tg: −42 ° C., manufactured by Arkema Co., Ltd., trade name: M22N) 50 parts by mass Photobase generator A (the following synthesis method) 5 parts by weight) Dilution solvent (ethyl acetate, DIC 100 parts by mass of Fix Co., Ltd.

  The photobase generator A used was synthesized as follows. First, 15 mL of methanol was placed in a 100 mL flask, and 2.00 g of potassium carbonate was added thereto. Next, 10 mL of methanol was put into a 50 mL flask, and 2.67 g (6.2 mmol) of ethoxycarbonylmethyl (triphenyl) phosphonium bromide (manufactured by Tokyo Chemical Industry Co., Ltd.) and 2-hydroxy-4- (5-ethylhexyloxy) 1.7 g (6.2 mmol) of -5-ethyl benzaldehyde was added and dissolved, and then the well-stirred methanol solution of potassium carbonate was slowly added dropwise. After stirring for 3 hours, TLC confirmed the completion of the reaction. Then, potassium carbonate was removed by filtration and concentrated under reduced pressure. After concentration, 50 mL of 1N aqueous sodium hydroxide solution was added and stirred for 1 hour. After completion of the reaction, triphenylphosphine oxide was removed by filtration, and concentrated hydrochloric acid was added dropwise to acidify the reaction solution. The precipitate was collected by filtration and washed with a small amount of chloroform to give 1.7 g of 2-hydroxy-4- (5-ethylhexyloxy) -5-ethylcinnamic acid. Subsequently, in a 100 mL three-necked flask under a nitrogen atmosphere, 1.0 g (3.19 mmol) of 2-hydroxy-4- (5-ethylhexyloxy) -5-ethylcinnamic acid is dissolved in 10 mL of dehydrated tetrahydrofuran, under an ice bath 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.73 g (3.83 mmol, 1.2 eq.) Was added. After 30 minutes, 129 mg (1.52 mmol, 0.95 eq.) Of piperidine (manufactured by Tokyo Chemical Industry Co., Ltd.) was added as an amine, and the mixture was stirred overnight. After completion of the reaction, the reaction solution was concentrated and dissolved in water. After extraction with chloroform, the resultant was washed with an aqueous hydrogen carbonate solution, 1N hydrochloric acid and saturated brine, dried over sodium sulfate, and concentrated to obtain 1.0 g of a photobase generator A represented by the following formula (I). .

Example 2
The same operation conditions and procedures as in Example 1 were followed except that the heating temperature of the hand roller with a heating function was 160 ° C. in Example 1. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 3]
In Example 1, the same working conditions and working procedures as in Example 1 were used except that a mortar plate (referred to as mortar type B. The same applies hereinafter) having a center line average roughness Ra of more than 1 μm and 2 μm or less was used as the target structure. I went there. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

Example 4
In Example 1, the heating temperature in the hand roller with a heating function was set to 160 ° C., and mortar type B was used as a target structure, under the same operating conditions and procedures as in Example 1. Various tests were also conducted in the same manner as in Example 1 for evaluation.

[Example 5]
The same operation conditions and operation procedure as in Example 1 were carried out except that an adhesive sheet having an adhesive layer formed of the following composition for forming an adhesive layer in Example 1 was used. Various tests were also conducted in the same manner as in Example 1 for evaluation.

(Adhesive layer forming composition)
Solid epoxy resin (bisphenol A type epoxy resin, molecular weight: 5,000, manufactured by Mitsubishi Chemical Corporation, trade name: jER 1009) 100 parts by mass PEMP (pentaerythritol tetrakis 3-mercaptopropionate, as a curing agent having a mercapto group, Viscosity: 400 to 550 mPa · s / 25 ° C., mercaptan equivalent: 125 to 137 g / eq., Manufactured by Mitsubishi Chemical Corporation, trade name: QX40) 7.6 parts by mass Thermoplastic polymer (modified with an amino group introduced) Methyl methacrylate-butyl acrylate-methyl methacrylate triblock copolymer, Tg: -42 ° C, manufactured by Arkema Co., Ltd., trade name: M22N) 50 parts by mass-Photobase generator A (same as the above synthesis method) 5 parts by mass Diluted solvent (ethyl acetate, manufactured by DIC Graphics, Inc.) 10 0 parts by mass

[Example 6]
The same working conditions and procedure as in Example 1 were followed, except that the composition for forming a viscous and adhesive layer in Example 1 was used and the heating temperature of the hand roller with a heating function was 160 ° C. went. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 7]
In Example 1, the same procedure as in Example 1 was followed except for using the composition for forming an adhesive and pressure-sensitive adhesive layer of Example 5 and mortar type B as a target structure. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 8]
In Example 1, the composition for forming an adhesive layer is the one of Example 5, the heating temperature of the hand roller with a heating function is set to 160 ° C., and mortar type B is used as a target structure, The same working conditions and working procedures as in Example 1 were used. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 9]
In Example 1, the same adhesive sheet as in Example 1 was used except that the repair / reinforcement member was changed from an aramid fiber to an aluminum foil (thickness: 50 μm). Other than that, it carried out by the same work conditions and work procedure as Example 1. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 10]
In Example 1, the repairing / reinforcing member was changed from aramid fiber to aluminum foil (thickness: 50 μm), and the heating temperature in the hand roller with a heating function was changed to 160 ° C. I went by the procedure. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 11]
In Example 1, the repairing / reinforcing member was changed from aramid fiber to aluminum foil (thickness: 50 μm), and mortar type B was used as the target structure, and the same working conditions and working procedures as in Example 1 were used. . Further, various tests were also conducted and evaluated in the same manner as in Example 1.

[Example 12]
In Example 1, the repair / reinforcement member was changed from aramid fiber to aluminum foil (thickness: 50 μm), the heating temperature at the hand roller with a heating function was set to 160 ° C., and mortar type B was used as the target structure. Were carried out under the same working conditions and working procedures as in Example 1. Further, various tests were also conducted and evaluated in the same manner as in Example 1.

Comparative Examples 1 to 6
Comparative Examples 1, 2, 3, 4, 5, and 6 correspond to Examples 1, 3, 5, 7, and 9, respectively, but were not heated by the hand roller with a heating function. The procedure was the same as in Examples 1, 3, 5, 7, and 9 except that no heating was applied. Various tests were also conducted and evaluated in the same manner as in Examples 1, 3, 5, 7, and 9.

Comparative Example 7
In Example 1, while changing the coating liquid for adhesive layer formation to the following, it did not heat with the hand roller with a heating function. Others were the same as in Example 1, and various tests were performed in the same manner as in Example 1 for evaluation.

(Adhesive layer forming composition)
Solid epoxy resin (bisphenol A type epoxy resin, molecular weight: 5000, manufactured by Mitsubishi Chemical Corporation, trade name: jER1009) 100 parts by mass Curing agent (dicyandiimide, manufactured by Mitsubishi Chemical Corporation, trade name: DICY7) 10 parts by weight 5 parts by mass of curing accelerator (amine adduct type, manufactured by Ajinomoto Fine Techno Co., Ltd., trade name: AMICURE MYH) 100 parts by mass of dilution solvent (ethyl acetate, manufactured by DIC Graphics Inc.)

Comparative Example 8
In Example 1, while changing the coating liquid for adhesive layer formation to the following, it did not heat with the hand roller with a heating function. Others were the same as in Example 1, and various tests were performed in the same manner as in Example 1 for evaluation.

(Adhesive layer forming composition)
Solid epoxy resin (bisphenol A type epoxy resin, molecular weight: 5000, manufactured by Mitsubishi Chemical Corporation, trade name: jER1009) 50 parts by mass Liquid epoxy resin (bisphenol A type epoxy resin, epoxy equivalent: 190 g / eq., Molecular weight: 380, manufactured by Mitsubishi Chemical Corporation, trade name: jER828) 50 parts by weight Curing agent (dicyandiimide, manufactured by Mitsubishi Chemical Corporation, trade name: DICY7) 10 parts by weight Curing accelerator (amine adduct system, Ajinomoto Fine Techno Co., Ltd.) Product name: Amicure MYH 5 parts by mass Diluted solvent (ethyl acetate, manufactured by DIC Graphics, Inc.) 100 parts by mass

[result]
The results are shown in Table 1. From the results in Table 1, the results in Examples 1 to 12 were that there were no air bubbles of 1 μm or more, and the workability was also good. This result was due to the effect of the heating means performed simultaneously with or immediately after the lamination of the tacky-adhesive sheet.

DESCRIPTION OF SYMBOLS 1,1 'Release film 2,2' Adhesive layer 3 Repair or reinforcement member 10,10A-10G Adhesive sheet S1, S2, S1 ', S2' The surface of an adhesive layer

Claims (5)

A method of repairing or reinforcing a target structure with surface irregularities using an adhesive sheet,
A mucoadhesive layer comprising an ionizing radiation curable resin and a compound that releases a polymerization initiator upon receiving ionizing radiation, and a repair or reinforcement provided in the mucoadhesive layer or on one surface of the mucoadhesive layer When the release film is provided on the opposite surface of the side to be bonded to the target structure or the repair or reinforcement member is disposed, the release film or the repair or reinforcement member has heat resistance. having the steps of preparing the adhesive sheet,
The step of irradiating the adhesive sheet with ionizing radiation or irradiating the adhesive sheet with ionizing radiation contained in natural light or artificial light to initiate curing of the adhesive layer;
After starting the curing, having the step of bonding the adhesive layer to the target structure,
In the step of bonding, pressurizing with heating at the same time as the bonding, or pressing with heating after the bonding, and follow the softened adhesive layer along the shape of the surface irregularities of the target structure And sticking together the adhesive layer according to the surface irregularities by the following,
After the bonding, curing of the mucoadhesive layer is advanced according to the environmental temperature of the target structure without irradiation with ionizing radiation or heat treatment, and the mucoadhesive layer is cured. A method of generating bubbles having a diameter of 1 μm or more on the surface of the target structure . The method according to claim 1 , wherein the irradiation with ionizing radiation or the irradiation with ionizing radiation contained in natural light or artificial light in the step of initiating curing is performed from at least one adhesive layer side. The method according to claim 1 , wherein the compound is a photobase generator that gradually generates a base that is a curing accelerator by the ionizing radiation . The method according to claim 1 , wherein the surface unevenness of the target structure has a center line average roughness Ra of more than 1 μm and 2 μm or less . It is used by the method of any one of Claims 1-4 , The adhesive sheet characterized by the above-mentioned.

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