Method for repairing resin structure
A pretreatment agent comprising a halogen-based surface modifier and adhesive primer is applied to dicyclopentadiene resin structures to enhance adhesion, enabling effective repair with fiber-reinforced plastic materials, addressing the poor adhesion challenges of dicyclopentadiene resin structures.
Patent Information
- Application Number
- JP2023209581
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2025-06-24
Smart Images
Figure 2025093749000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method for repairing a resin structure.
Background Art
[0002] Conventionally, as disclosed in Patent Document 1 below, a repair method for repairing corrosion and deterioration of a fiber-reinforced plastic storage tank is well known. This repair method aims to improve the adhesive strength and includes a polishing step, a solvent application step, a scratching step, a cleaning step, and an adhesion step for the surface portion of the storage tank. In the adhesion step, a repair material, which is the adherend, is finally adhered to the surface portion of the storage tank.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] Generally, resin structures such as storage tanks are composed of fiber-reinforced plastics, but dicyclopentadiene resins have attracted attention as an alternative to fiber-reinforced plastics. Dicyclopentadiene resins have the advantage of being less likely to crack compared to fiber-reinforced plastics. Dicyclopentadiene resins can be suitably used for large resin structures such as, for example, the tank body of a septic tank or a storage tank, and the body of a large vehicle.
[0005] On the one hand, it is known that a resin structure made of dicyclopentadiene resin has poor adhesion performance and is difficult to adhere compared to those made of fiber-reinforced plastics. Therefore, it is difficult to directly adopt the repair method of Patent Document 1 for repairing a resin structure made of dicyclopentadiene resin. Thus, it has been considered to adopt a repair method in which a surface modification treatment such as plasma surface treatment is performed on the repair location of the resin structure in advance and then a repair material is adhered.
[0006] However, even if the above surface modification treatment is adopted, although a certain degree of improvement in adhesion performance can be expected, it is difficult to satisfy the desired adhesion strength of the repair material to the resin structure. Therefore, for example, a patch plate adapted to the shape of the repair location is manufactured, and a repair method can be adopted in which the patch plate is fixed with a fixing member such as a rivet or a bolt nut with silicon or an adhesive sandwiched between the patch plate and the repair location. This repair method has the problem of being time-consuming because a patch plate needs to be manufactured in advance and a fixing member is required. In addition, surface modification treatments such as plasma surface treatment are disadvantageous in that large-scale treatment equipment is required.
[0007] The present invention has been made in view of such problems, and aims to provide a simple repair method for a resin structure made of dicyclopentadiene resin.
Means for Solving the Problems
[0008] One aspect of the present invention is a method for repairing a resin structure made of dicyclopentadiene resin, comprising a pretreatment agent application step of applying a pretreatment agent for suppressing a decrease in adhesion performance to a repair target surface including a repair location of the resin structure, and a repair material adhesion step of adhering a repair material made of fiber-reinforced plastic to the repair target surface of the resin structure after the pretreatment agent application step, and having a method for repairing a resin structure. It is in.
Effects of the Invention
[0009] In the repair method of the above aspect, first, in the pretreatment agent application step, a pretreatment agent for suppressing a decrease in adhesion performance is applied to the repair target surface including the repair portion in the resin structure made of dicyclopentadiene resin. Then, in the repair material adhesion step, a repair material made of fiber-reinforced plastic is adhered to the repair target surface of the resin structure. As a result, the repair material is adhered to the resin structure in a state where a decrease in adhesion performance is suppressed by the effect of the pretreatment agent, and the repair portion is covered with this repair material.
[0010] According to such a repair method, by previously applying a pretreatment agent to the repair target surface of the resin structure, even in the case of a material with poor adhesion such as a resin structure made of dicyclopentadiene resin, it becomes possible to favorably adhere a repair material to the repair target surface. Also, large-scale equipment required in the case of a surface modification treatment such as plasma surface treatment is unnecessary, and the repair portion of the resin structure can be simply repaired.
[0011] As described above, according to the above aspect, a simple repair method for a resin structure made of dicyclopentadiene resin can be provided.
Brief Description of the Drawings
[0012]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
[0013] Preferred embodiments of the above aspects are described below.
[0014] In the above-mentioned embodiment of the resin structure repair method, in the pretreatment agent application step, a halogen-based surface modifier and a carbon-containing adhesive primer are preferably used as the pretreatment agent, and the halogen-based surface modifier is applied to the surface to be repaired, followed by application of the adhesive primer. The halogen-based surface modifier serves to suppress the release of unreacted monomers that contribute to a decrease in adhesive performance. The carbon-containing adhesive primer serves to shield the unreacted monomers that contribute to a decrease in adhesive performance with carbon, in addition to functioning as an adhesive for the repair material. According to this repair method, the halogen-based surface modifier and the carbon-containing adhesive primer are sequentially applied to the surface to be repaired of the resin structure, thereby making it possible to reliably adhere the repair material to the surface to be repaired of the resin structure.
[0015] In the method for repairing a resin structure according to the above aspect, in the pretreatment agent application step, it is preferable to use a chlorine-based product containing isocyanuric acid halide as the halogen-based surface modifier. Isocyanuric acid halide has a high effect of suppressing the release of unreacted monomers that contribute to a decrease in adhesion performance. According to this repair method, by using a halogen-based surface modifier containing isocyanuric acid halide, it becomes possible to increase the adhesive strength of the repair material to the repair target surface of the resin structure.
[0016] The method for repairing a resin structure according to the above aspect preferably has a post-treatment step of performing post-treatment to make the adhesive strength of the repair material to the resin structure higher than that immediately after the adhesion treatment. According to this repair method, by implementing the post-treatment step following the repair material adhesion step, it becomes possible to improve the adhesive strength of the repair material to the repair target surface of the resin structure to a desired level.
[0017] In the method for repairing a resin structure according to the above aspect, when a resin structure made of dicyclopentadiene resin is used as the first resin structure and a resin structure made of fiber-reinforced plastic is used as the second resin structure, in the post-treatment step, it is preferable to use post-treatment conditions such that the adhesive strength of the repair material to the first resin structure exceeds the adhesive strength of the repair material to the second resin structure. According to this repair method, it becomes possible to obtain an adhesive strength higher than that of a resin structure made of fiber-reinforced plastic.
[0018] In the method for repairing a resin structure according to the above aspect, the resin structure is the tank body of a septic tank or a storage tank that is used in an embedded manner. In the pretreatment agent application step, it is preferable to apply the pretreatment agent from inside the tank of the tank body to the repair target surface, and in the repair material adhesion step, to adhere the repair material from inside the tank of the tank body to the repair target surface. According to this repair method, when the tank body of a septic tank or a storage tank that is used in an embedded manner is a resin structure made of dicyclopentadiene resin, it becomes possible for an operator to enter the tank and repair the target location with a relatively simple operation.
[0019] Hereinafter, a specific example of the method for repairing the resin structure according to the above-described embodiment will be described with reference to the drawings.
[0020] (Embodiment 1) 1. Resin structure 10 As shown in FIG. 1, the resin structure 10 used in Embodiment 1 is the tank body of a septic tank or a storage tank. This resin structure 10 has a manhole 10a and an internal space 10b. This resin structure 10 is generally buried in the ground or the like for use (in some cases, it may be installed on the ground as required). The manhole 10a is a part of each part of the resin structure 10 that enables an operator to enter the internal space 10b, and is basically used for the maintenance and inspection of the resin structure 10. The internal space 10b is a space where the influent water flowing in from the outside is temporarily stored.
[0021] The resin structure 10 is a structure made of dicyclopentadiene resin. This resin structure 10 has a physical property of being less likely to crack compared to a structure made of fiber-reinforced plastic. For the molding of the resin structure 10, a method called "RIM (Reaction Injection Molding)" is used. Although the detailed description is omitted, RIM molding is well-known as an injection molding method in which materials are injected into a closed mold. In general injection molding, materials that need to be injected into the mold at high pressure while being melted by heat are used, whereas in RIM molding, materials that need to be mixed and collided to react are used. Therefore, compared with injection molding, the raw materials can be injected into the mold at low pressure and molded at low pressure. Therefore, according to RIM molding, there is an advantage that inexpensive equipment can be used, and the injection time can be extended by arbitrarily adjusting the reaction time, making it easy to mold large-sized products.
[0022] The resin structure 10 may have a repair site 11 (see Fig. 3). Although dicyclopentadiene resin is inherently a material that is difficult to crack, cracks may occur as the repair site 11 for some reason. Also, although dicyclopentadiene resin is a material that is less likely to deteriorate over time, aging deterioration may occur as the repair site 11. When repairing such a repair site 11, it is required to keep the maintenance cost low.
[0023] If an attempt is made to repair the resin structure 10 from the outside, for example, it is necessary to remove backfill soil, upper slab concrete, etc., which requires a huge amount of labor and increases the maintenance cost. Therefore, in order to keep the maintenance cost low, a repair operation in which an operator enters the internal space 10b through the manhole 10a of the resin structure 10 and performs repair work on-site is effective. This repair operation can be achieved by the operator adhering the repair material 30 from inside the tank to the repair target surface 12 including the repair site 11 of the resin structure 10 (see Fig. 1).
[0024] 2. Repair Material 30 In this embodiment, the repair material 30 is a sheet-shaped overlay resin material having a generally constant thickness. This repair material 30 is made of a fiber-reinforced plastic in which an unsaturated polyester resin is reinforced with glass fibers. This type of fiber-reinforced plastic is generally referred to as "FRP (Fiber-Reinforced Plastics)". If necessary, a fiber-reinforced plastic combining fibers such as glass fibers and carbon fibers with reactive resins such as unsaturated polyester resins and epoxy resins and thermoplastic resins may be used. Note that the planar shape of the repair material 30 is appropriately changed according to the shape of the repair site 11.
[0025] 3. Repair Method With reference to FIGS. 1 to 7, a method for repairing a fiber structure according to Embodiment 1 (hereinafter simply referred to as "repair method") will be described. This repair method can be achieved by sequentially executing each step from step S101 to step S104 in FIG. 2. If necessary, one or more steps may be added to these steps, or at least one step may be divided into multiple steps.
[0026] 3-1. Preparation Step Step S101 in FIG. 2 is a preparation step for the pretreatment agent application step. In the preparation step, the repair target surface 12 (see FIG. 4) of the resin structure 10 and its surroundings are washed and cleaned with water. Thereafter, the repair target surface 12 is polished using polishing means such as sandpaper or a grinding wheel of a grinder. This polishing process is also referred to as "sanding". Further, the repair target surface 12 after the polishing process is degreased with a solvent such as acetone.
[0027] 3-2. Pretreatment Agent Application Step Step S102 in FIG. 2 is the pretreatment agent application step. In the pretreatment agent application step, a pretreatment agent 20 (see FIG. 1) for suppressing a decrease in adhesion performance is applied to the repair target surface 12 of the resin structure 10. In this embodiment, with the ventilation in the tank maintained well, the operator applies the pretreatment agent 20 from the tank to the repair target surface 12 of the resin structure 10. In this embodiment, two types, a halogen-based surface modifier 20A and an adhesive primer 20B, are used as the pretreatment agent 20. First, the halogen-based surface modifier 20A is applied to the repair target surface 12 of the resin structure 10 and then dried for a predetermined time. Subsequently, the adhesive primer 20B is applied to this repair target surface 12 and then dried for a predetermined time. Note that, if necessary, the halogen-based surface modifier 20A may be changed to another surface modifier having the same function as this halogen-based surface modifier 20A.
[0028] 3-3. Repair Material Adhesion Step Step S103 in FIG. 2 is the repair material adhesion step. In the repair material adhesion step, after the pretreatment agent application step, the repair material 30 is adhered to the repair target surface 12 of the resin structure 10. In this embodiment, with the ventilation in the tank being maintained well, the operator adheres the repair material 30 from inside the tank to the repair target surface 12 of the resin structure 10. The process of adhering the repair material 30 is also referred to as "overlay". According to this repair material adhesion step, the repair location 11 of the resin structure 10 is blocked by the repair material 30.
[0029] 3-4. Post-treatment process Step S104 in FIG. 2 is a post-treatment process performed after the repair material adhesion step. In the post-treatment process, post-treatment is performed to make the adhesion strength of the repair material 30 to the resin structure 10 higher than that immediately after the adhesion treatment. For example, post-treatment conditions such as leaving the adhered part at room temperature for a long time (the "Condition B" described later) or maintaining the adhered part at a predetermined temperature for a predetermined time (the "Condition C" described later) can be adopted. Heating of the adhered part can be performed, for example, by carrying a heating means such as a heater (not shown) into the tank of the resin structure 10. According to this post-treatment process, the adhesion strength is increased by the thermosetting action of the adhered part. This post-treatment is also referred to as "after-cure".
[0030] 4. Halogen-based surface modifier 20A The halogen-based surface modifier 20A used in this embodiment is a mixed solution of halogenated isocyanuric acid and a solvent. This halogen-based surface modifier 20A functions to suppress the release of unreacted monomers that contribute to the reduction of adhesion performance.
[0031] As an example of halogenated isocyanuric acid, chlorine-based trichloroisocyanuric acid can be used. Note that the type and number of halogen substituents are not limited to this. For example, the chlorine in trichloroisocyanuric acid can be replaced with fluorine or bromine. Also, the number of halogen substituents can be changed from three to two. As an example of the solvent, ethyl acetate and toluene can be used. Note that instead of or in addition to this, similar solvents such as butyl acetate and xylene can be used.
[0032] For example, when using trichloroisocyanuric acid, the volume ratio of trichloroisocyanuric acid in the halogen-based surface modifier 20A can be set to about 3%, for example. The value of this volume ratio is not particularly limited, and it is preferably set appropriately according to the combination of halogenated isocyanuric acid and the solvent, etc.
[0033] 5. Primer 20B for adhesion The primer 20B for adhesion is a primer that is also used as an adhesive for the repair material 30. While a general primer assists the function of an adhesive, the primer 20B for adhesion is different in that the primer itself has a function like that of an adhesive. In this embodiment, the primer 20B for adhesion is a primer for urethane-based adhesives. Instead of this, a primer for adhesives other than urethane-based ones may also be used. For example, urethane-based adhesives contain ethyl acetate, toluene, carbon black, butyl acetate, and chlorobenzene. The primer 20B for adhesion containing carbon in this way serves a function of shielding unreacted monomers that contribute to a decrease in adhesion performance in addition to the function as an adhesive. That is, this primer 20B for adhesion serves a function of suppressing a decrease in adhesion performance, similar to the halogen-based surface modifier 20A.
[0034] Therefore, the primer 20B for adhesion, in cooperation with the halogen-based surface modifier 20A, exhibits a function of enhancing the adhesion strength of the repair material 30 to the repair target surface 12 of the resin structure 10. Note that the primer 20B for adhesion may or may not contain carbon. When the desired release suppression effect (desired adhesion strength) of unreacted monomers can be obtained only with the halogen-based surface modifier 20A, a primer 20B for adhesion that does not contain carbon can be used.
[0035] 6. Evaluation test The present inventor conducted an evaluation test to confirm the effectiveness of the above-described repair method as follows.
[0036] Preparation of Specimens for Evaluation As shown in FIGS. 8 and 9, two flat specimens 41 corresponding to the resin structure 10 and a sheet-like specimen 42 corresponding to the repair material 30 were prepared for the evaluation test. Then, the same procedures as the repair method in FIG. 2 were executed. In these drawings, the thickness direction of the specimen 41 is defined as the arrow X direction, and the width direction and the depth direction, which are orthogonal to the thickness direction X and orthogonal to each other, are defined as the arrow Y direction and the arrow Z direction, respectively.
[0037] First, as a process corresponding to step S101 (preparation step) in FIG. 2, each surface 41a of the two specimens 41 was used as a surface to be repaired, and each surface 41a was polished. Further, each surface 41a was degreased with a solvent. Then, with the two specimens 41 butted against each other in the width direction Y, masking tape 43 was attached to the two specimens 41 so as to close the gap therebetween. This masking tape 43 was used to prevent the pretreatment agent 20 from entering the gap between the two specimens 41.
[0038] Next, as a process corresponding to step S102 (pretreatment agent application step) in FIG. 2, a halogen-based surface modifier 20A was first applied to each surface 41a of the two specimens 41 and then dried for a predetermined time (for example, about 10 minutes). Subsequently, an adhesive primer 20B was applied to each surface 41a of the two specimens 41 and then dried for a predetermined time (for example, about 10 minutes).
[0039] Next, as a process corresponding to step S103 (repair material adhesion step) in FIG. 2, the specimen 42 was adhered to each surface 41a of the two specimens 41 by overlapping them in the thickness direction X. In the adhesion between the specimen 41 and the specimen 42, the adhesion function of the adhesive primer 20B was utilized. Thus, a molded body W, which is an adhesive body obtained by adhering the specimen 42 to the two specimens 41, was produced.
[0040] Furthermore, by subjecting the molded body W to post-treatment corresponding to step S104 (post-treatment step) in FIG. 2, for example, the evaluation work W1 shown in FIG. 12 was produced. In this embodiment, as shown in FIG. 10, six types of evaluation works W1 to W6 including the evaluation work W1 were produced.
[0041] 6-2. Tensile Measurement Each of the evaluation works W1 to W6 was sequentially set in a known universal testing machine (not shown), and tensile measurement was performed by pulling at a constant speed so as to separate the two test pieces 41 of the evaluation work in the width direction Y from each other. FIG. 12 shows the state of tensile measurement of one evaluation work W1. The stress measured at this time was defined as the adhesion strength S of the adhesion portion between the test piece 41 and the test piece 42 in the evaluation work W1.
[0042] 6-3. Classification of Evaluation Works All three evaluation works W1 to W3 were prepared as examples and are made of dicyclopentadiene resin. On the other hand, the remaining three evaluation works W3 to W6 were all prepared as comparative examples and are made of fiber-reinforced plastic. Note that the evaluation works W1 and W4 adopted condition A in which the post-treatment step was not performed. In contrast, the evaluation works W2 and W5 adopted condition B which is a post-treatment condition, and the evaluation works W3 and W6 adopted condition C which is a post-treatment condition.
[0043] 6-4. Classification of Treatment Conditions As shown in FIG. 11, Condition A is a processing condition in which the standing time t1 from immediately after the adhesion treatment of the test piece 41 and the test piece 42 to the above-described tensile test is set to a short time of about 2 hours, for example. Therefore, Condition A does not substantially correspond to a post-treatment condition. Condition B is a processing condition in which the test pieces 41 and 42 are left at room temperature for d days from immediately after the adhesion treatment to the above-described tensile test, and corresponds to a post-treatment condition. In this Condition B, the standing time of the evaluation work is significantly longer than that of Condition A. Condition C is a processing condition in which an after-cure time in which the temperature condition of T [° C.] is maintained for t2 hours is provided from immediately after the adhesion treatment of the test piece 41 and the test piece 42, and then left at room temperature for d days until the above-described tensile test, and corresponds to a post-treatment condition.
[0044] Note that the specific numerical values in each processing condition in FIG. 11 are not particularly limited, but as an example, t1 = 2, t2 = 6, d = 4, and T = 75 can be set. Other numerical values may be appropriately adopted as necessary.
[0045] 6-5. Evaluation Results The evaluation results in FIG. 13 are about the relationship between the processing conditions and the adhesive strength. In this evaluation result, the plots indicated by the symbol "〇" are for the three evaluation workpieces W1 to W3 of the example (in the case of the first resin structure 10 using dicyclopentadiene resin). Further, the plots indicated by the symbol "Δ" are for the three evaluation workpieces W4 to W6 of the comparative example (in the case of the second resin structure 10' using fiber-reinforced plastic).
[0046] In the case of the examples, the adhesive strength S of the evaluation workpiece W2 (condition B) exceeded that of the evaluation workpiece W1 (condition A), and it was confirmed that the adhesive strength S of the evaluation workpiece W3 (condition C) exceeded that of the evaluation workpiece W2 (condition B). Similarly, in the case of the comparative examples, it was confirmed that the adhesive strength S of the evaluation workpiece W5 (condition B) exceeded that of the evaluation workpiece W4 (condition A), and the adhesive strength S of the evaluation workpiece W6 (condition C) exceeded that of the evaluation workpiece W5 (condition B). Based on these results, in order to increase the adhesive strength S of the bonded portion, it is preferable to adopt the post-treatment conditions of condition B, and it can be evaluated that the post-treatment conditions of condition C are superior to those of condition B.
[0047] When comparing the examples and the comparative examples, it was confirmed that the adhesive strength S of the evaluation workpiece W5 (condition B) of the comparative examples was lower than that of the evaluation workpiece W1 (condition A) of the examples. Also, it was confirmed that the adhesive strength S of the evaluation workpiece W6 (condition C) of the comparative examples exceeded that of the evaluation workpiece W1 (condition A) of the examples and was lower than that of the evaluation workpiece W2 (condition B) of the examples. Based on these results, if the adhesive strength S of the evaluation workpiece W6 of the comparative examples is used as the management reference value Th and post-treatment conditions (for example, condition B or condition C) that exceed the management reference value Th are adopted, it is possible to obtain a higher adhesive strength S than in the comparative examples.
[0048] 7. Operational Effects According to the above-described Embodiment 1, the following operational effects are achieved.
[0049] In the repair method of Embodiment 1, first, in the pretreatment agent application step, a pretreatment agent 20 for suppressing a decrease in adhesion performance is applied to a repair target surface 12 including a repair portion 11 of a resin structure 10 made of dicyclopentadiene resin. Then, in the repair material adhesion step, a repair material 30 made of fiber-reinforced plastic is adhered to the repair target surface 12 of the resin structure 10. As a result, the repair material 30 is adhered to the resin structure 10 in a state where a decrease in adhesion performance is suppressed by the effect of the pretreatment agent, and the repair portion 11 is covered with this repair material 30.
[0050] According to such a repair method, by previously applying a pretreatment agent 20 for suppressing a decrease in adhesion performance to the repair target surface 12 of the resin structure 10, even for a resin structure 10 having poor adhesion such as a resin structure made of dicyclopentadiene resin, it becomes possible to favorably adhere the repair material 30 to the repair target surface 12. Further, large-scale equipment required in the case of a surface modification treatment such as plasma surface treatment is unnecessary, and the repair portion 11 of the resin structure 10 can be simply repaired.
[0051] Therefore, according to the above-described Embodiment 1, it is possible to provide a simple repair method for the resin structure 10 made of dicyclopentadiene resin.
[0052] Further, according to the repair method of Embodiment 1, by sequentially applying a halogen-based surface modifier 20A and an adhesive primer 20B containing carbon to the repair target surface 12 of the resin structure 10, it becomes possible to surely adhere the repair material 30 to the repair target surface 12 of the resin structure 10.
[0053] Further, according to the repair method of Embodiment 1, by using a halogen-based surface modifier 20A containing halogenated isocyanuric acid, it becomes possible to increase the adhesion strength S of the repair material 30 to the repair target surface 12 of the resin structure 10.
[0054] Further, according to the repair method of Embodiment 1, by performing a post-treatment step for increasing the adhesion strength S following the repair material adhesion step, it becomes possible to improve the adhesion strength S of the repair material 30 to the repair target surface 12 of the resin structure 10 to a desired level.
[0055] Further, according to the repair method of Embodiment 1, for a resin structure made of dicyclopentadiene resin (that is, the first resin structure 10), it becomes possible to obtain an adhesion strength S exceeding that of a resin structure made of fiber-reinforced plastic (that is, the second resin structure 10').
[0056] Further, according to the repair method of Embodiment 1, when the tank body of the septic tank or storage tank is the resin structure 10 made of dicyclopentadiene resin, an operator can enter the tank of the resin structure 10 and repair the repair portion 11 with a relatively simple operation.
[0057] Hereinafter, other embodiments related to the above-described Embodiment 1 will be described with reference to the drawings. In other embodiments, the same reference numerals as those of the elements of the above-described Embodiment 1 are given, and the description of the same elements is omitted.
[0058] (Embodiment 2) The repair method of Embodiment 2 can be achieved by sequentially executing each step from step S201 to step S203 in FIG. 14. Step S201, step S202, and step S203 are the same as step S101, step S102, and step S103 (see FIG. 2) of Embodiment 1. That is, in Embodiment 2, the process corresponding to the post-treatment process (step S104 in FIG. 2) of Embodiment 1 is omitted.
[0059] Based on the evaluation results in FIG. 13, it was confirmed that even for the evaluation work W1 (condition A) of the example, that is, even when the post-treatment is not performed on the molded body W, a higher adhesive strength S can be obtained than that of the evaluation work W5 (condition B) of the comparative example. Therefore, in Embodiment 2, the post-treatment process is omitted based on this evaluation result.
[0060] According to Embodiment 2, by omitting the post-treatment process, it is possible to shorten the time required for the repair work of the resin structure 10.
[0061] The present invention is not limited to the above-described forms only, and various applications and modifications can be considered without departing from the object of the present invention. For example, the following forms applying the above-described forms can also be implemented.
[0062] In the above-described embodiment, the case where the halogen-based surface modifier 20A is used as the pretreatment agent has been exemplified. However, instead of this, potassium nitrate, potassium permanganate, etc. may be used.
[0063] In the above-described embodiment, the repair method for the tank body of the septic tank or the storage tank has been exemplified. However, the resin structure to be repaired is not limited to the tank body, and the present invention can be applied to repair methods for components other than the tank body of the septic tank or the storage tank, and resin structures used in fields other than the septic tank and the storage tank (for example, the body of a large vehicle).
Explanation of Signs
[0064] 10…Resin structure (first resin structure) 10’…Resin structure (second resin structure) 11…Repair location 12…Surface to be repaired 20…Pretreatment agent 20A…Halogen-based surface modifier (pretreatment agent) 20B…Adhesive primer (pretreatment agent) 30…Repair material S…Adhesion strength S101~S104, S201~S203…Repair methods for resin structures S102, S202…Pretreatment agent application step S103, S203…Repair material adhesion step S104…Post-treatment step
Claims
1. A method for repairing a resin structure made of dicyclopentadiene resin, comprising: a pretreatment agent application step of applying a pretreatment agent for suppressing a decrease in adhesion performance to a repair target surface including a repair portion of the resin structure; a repair material adhesion step of adhering a repair material made of fiber reinforced plastic to the repair target surface of the resin structure after the pretreatment agent application step; A method for repairing a resin structure, comprising the above steps.
2. In the pretreatment agent application step, as the pretreatment agent, a halogen-based surface modifier and an adhesive primer containing carbon are used, and the adhesive primer is applied after applying the halogen-based surface modifier to the repair target surface. The method for repairing a resin structure according to claim 1.
3. In the pretreatment agent application step, a chlorine-based one containing halogenated isocyanuric acid is used as the halogen-based surface modifier. The method for repairing a resin structure according to claim 2.
4. The method for repairing a resin structure according to any one of claims 1 to 3, further comprising a post-treatment step of performing a post-treatment for making the adhesion strength of the repair material to the resin structure higher than that immediately after the adhesion treatment.
5. When the resin structure made of dicyclopentadiene resin is a first resin structure and the resin structure made of fiber reinforced plastic is a second resin structure, in the post-treatment step, post-treatment conditions are used such that the adhesion strength of the repair material to the first resin structure exceeds the adhesion strength of the repair material to the second resin structure. The method for repairing a resin structure according to claim 4.
6. The resin structure is a tank body of a septic tank or a storage tank used by being buried. In the pretreatment agent application step, the pretreatment agent is applied to the repair target surface from inside the tank of the tank body. In the repair material adhesion step, the repair material is adhered to the repair target surface from inside the tank of the tank body. The method for repairing a resin structure according to any one of claims 1 to 3.