JP2019025841A - Fiber-reinforced resin composite, and production apparatus thereof - Google Patents

Abstract

To provide a durable fiber-reinforced resin composite that is obtained by combining each fiber-reinforced resin and can be produced at a low cost, and a production apparatus thereof.SOLUTION: A fiber-reinforced resin composite 20 is produced by combining a plurality of fiber-reinforced resins 10,11 having a resin containing a dynamic covalent bond as a matrix resin and reinforcing fibers arranged in the matrix resin. The fiber-reinforced resins 11, 11 are formed by sewing each fiber-reinforced resin 10, 11 with sewing threads 21. A production apparatus of the fiber-reinforced resin composite 20 is equipped with a sewing device having a sewing needle 22 to sew each fiber-reinforced resin 10, 11 with the sewing threads 21 and a heating device to heat and soften a resin located at least either before and below or before and after the sewing needle in the sewing direction of the sewing device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fiber reinforced resin composite and an apparatus for manufacturing the same.

  Fiber reinforced resin (FRP), which is a resin reinforced with fibers, is lightweight and excellent in mechanical strength. Therefore, it has been developed and put into practical use as a structural material or as a high-strength member over a wide range of fields. Yes. As a method for producing a structure using this material, a method is used in which a fiber is pre-impregnated with a thermosetting resin and a sheet-like prepreg is molded and heated to be cured, or the fiber is spread. An RTM method (Resin Transfer Molding) in which a resin is poured into a mating mold and cured by heating is well known.

  However, in order to manufacture a large-sized structure, it is necessary to increase the size of the heating device so that the entire structure can be accommodated, resulting in an increase in manufacturing cost. If small parts are heat-cured and then joined, a large heating device is not required, but bonding with an adhesive alone does not connect the fibers between the two parts, resulting in low strength. It is possible to make a hole and fasten it with a bolt or rivet, but since stress concentrates on the hole part, there is a concern about deterioration due to cracking or the like.

  As a technique for joining fabrics including fibers, a technique described in Patent Document 1 is known. Patent Document 1 discloses a superimposing step of alternately superimposing a woven fabric made of ultrahigh molecular weight polyethylene fibers and a prepreg, a suturing step of stitching the woven fabric and the prepreg, and a thermosetting that constitutes the prepreg. A method for joining ultra-high molecular weight polyethylene fiber fabrics characterized by comprising a thermosetting step of thermosetting a resin is described. In the technique described in Patent Document 1, since a needle penetrates easily in a semi-cured prepreg, it is possible to perform suturing without making a hole in advance.

JP 2013-946 A

  A structure using a fiber reinforced resin is excellent in terms of light weight and high strength, but the production of a large structure is expensive. When manufacturing such a large structure at a low cost, or as a method for manufacturing a complex structure that cannot be formed simply by pressing with a compression molding machine at a low cost, a method of first molding small parts and then joining them There is. However, the technique disclosed in Patent Document 1 has a problem that the strength of the joint portion decreases or the durability decreases. In addition, since the fibers are not bonded in the bonding using only the adhesive, there is a problem that the strength is lowered as compared with other portions.

  In addition, when trying to join by stitching, in a fiber reinforced resin composite using a high-strength ordinary thermosetting resin, if a hole is made for stitching, the hole remains open and the presence of the hole Decreases the strength. In addition, cracks are likely to occur from the hole portion, and cracks are also likely to occur when a hole is originally formed.

  The present invention has been made in view of such problems, and the problem to be solved by the present invention has sufficient durability in a fiber reinforced resin composite in which fiber reinforced resins are joined together, and It is to provide a fiber reinforced resin composite that can be manufactured at low cost and a manufacturing apparatus thereof.

  The present inventors have intensively studied to solve the above problems. As a result, the following knowledge was found and the present invention was completed. That is, the gist of the present invention is constituted by joining a plurality of fiber reinforced resins having a resin including a dynamic covalent bond as a matrix resin and reinforcing fibers arranged inside the resin, the fiber reinforced resin. The present invention relates to a fiber reinforced resin composite characterized in that the fiber reinforced resin composites are joined together by being sewn together by a suture thread. The other means for solving will be described later in the mode for carrying out the invention.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the fiber reinforced resin composite which has sufficient durability in the fiber reinforced resin composite which joined fiber reinforced resin, and can be manufactured cheaply, and its manufacturing apparatus.

It is a schematic diagram of the fiber reinforced resin composite obtained by superposing | stacking two fiber reinforced resin, and joining by stitching | suture. It is a schematic diagram of a fiber reinforced resin composite obtained by superposing and joining a flat fiber reinforced resin and a folded fiber reinforced resin by stitching. It is sectional drawing of the fiber reinforced resin composite obtained by sewing up two fiber reinforced resins. It is sectional drawing of the fiber reinforced resin composite obtained by burying a suture in fiber reinforced resin by pulling a suture strongly at the time of stitching. FIG. 4 is a cross-sectional view of a fiber-reinforced resin composite in which a protective film is formed by applying DCB resin before curing to a stitched portion and heating and curing after performing normal stitching as in FIG. 3.

  Hereinafter, a form for carrying out the present invention (this embodiment) will be described with reference to the drawings as appropriate.

  In the fiber reinforced resin composite of this embodiment, a resin using dynamic covalent bonding (hereinafter referred to as “DCB resin”) is used as the matrix resin. And what reinforce | strengthened the inside of this DCB resin with the reinforced fiber is a fiber reinforced resin, and what joined this fiber reinforced resin in multiple numbers is a fiber reinforced resin composite.

  While the structure formed by the dynamic covalent bond is thermodynamically stable, the structure can be changed by specific external stimuli such as temperature, light, and pressure. Since the bond involved is a covalent bond, the strength is also strong. As a resin that realizes a dynamic covalent bond, for example, a resin utilizing an ester bond exchange reaction can be considered. In order to utilize the transesterification reaction, an epoxy compound having a polyfunctional epoxy group as a monomer that forms an ester bond at the time of curing, a carboxylic acid anhydride or polyvalent carboxylic acid as a curing agent, a protecting group for protecting a hydroxyl group, transesterification A catalyst that promotes the reaction is used.

  Examples of epoxy compounds include bisphenol A diglycidyl ether phenol, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, resorcinol diglycidyl ether, hexahydrobisphenol A diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol Diglycidyl ether, phthalic acid diglycidyl ester, dimer acid diglycidyl ester, triglycidyl isocyanurate, tetraglycidyl diaminodiphenylmethane, tetraglycidyl metaxylenediamine, cresol novolac polyglycidyl ether, tetrabromobisphenol A diglycidyl ether, bisphenol hexafluoroacetone And diglycidyl ether.

  Examples of the carboxylic acid anhydride or polyvalent carboxylic acid as the curing agent include phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, 3-dodecenyl succinic anhydride, octenyl succinic anhydride, Methyl hexahydrophthalic anhydride, methyl nadic anhydride, dodecyl succinic anhydride, chlorendic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bis (anhydrotrimate), methylcyclohexene tetracarboxylic acid Anhydride, trimellitic anhydride, polyazeline acid anhydride, ethylene glycol bisanhydro trimellitate, 1,2,3,4-butanetetracarboxylic acid, 4-cyclohexene-1,2-dicarboxylic acid, polyvalent fatty acid Etc.

  Examples of protecting groups include trichloroacetic acid ester, formic acid ester, acetic acid ester, isobutyric acid ester, pivalic acid ester, benzoic acid ester, methoxymethyl ether, tetrahydropyranyl ether, tetrahydrothiopyranyl ether, 4-methoxytetrahydropyranyl ether, 4 -Methoxytetrahydrothiopyranyl ether, tetrahydrofuranyl ether, tetrahydrothiofuranyl ether, 1-methyl-1-methoxyethyl ether, 2- (phenylselenyl) ethyl ether, t-butyl ether, allyl ether, benzyl ether, o -Nitrobenzyl ether, triphenyl methyl ether, α-naphthyl diphenyl methyl ether and the like.

  Examples of catalysts include zinc acetate (II), zinc (II) acetylacetonate, zinc naphthenate (II), acetylacetone iron (III), acetylacetone cobalt (II), acetylacetone cobalt (III), aluminum isopropoxide, Titanium isopropoxide, methoxide (triphenylphosphine) copper (I) complex, ethoxide (triphenylphosphine) copper (I) complex, propoxide (triphenylphosphine) copper (I) complex, isopropoxide (triphenylphosphine) Copper (I) complex, methoxide bis (triphenylphosphine) copper (II) complex, ethoxide bis (triphenylphosphine) copper (II) complex, propoxide bis (triphenylphosphine) copper (II) complex, isopropoxide bis (tri Phenylphosphine) copper (II) complex, tri (2,4-pentanedionato) cobalt (III), cobalt (II) naphthenate, cobalt (II) stearate, tin diacetate (II), di (2-ethylhexanoic acid) tin (II), N , N-dimethyl-4-aminopyridine, diazabicycloundecene, diazabicyclononene, triazabicyclodecene, triphenylphosphine, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2- Examples include phenylimidazole and 1-cyanoethyl-2-phenylimidazole.

  Examples of the dynamic covalent bond include, but are not limited to, a photocycloaddition reaction, an imine bond, a disulfide bond, an acyl hydrazone bond, and an ester bond.

  Examples of the reinforcing fiber constituting the fiber reinforced resin include carbon fiber, glass fiber, metal fiber, synthetic fiber, semi-synthetic fiber, natural fiber, and the like. Basically, it is woven and has strength against pulling in all directions, but depending on the use location and purpose of the fiber reinforced resin composite, fibers arranged in only one direction may be used. .

  The fiber reinforced resin constituting the fiber reinforced resin composite is obtained by producing a DCB resin plate while using the reinforced fibers and then heating and performing a curing treatment. Next, the obtained plate-like DCB resin is subjected to a treatment for activating a covalent bond exchange reaction, such as heating or light irradiation, and processed into a required shape by a press or the like. By these steps, a fiber reinforced resin is obtained. Then, a plurality of fiber reinforced resins are preliminarily overlapped at predesigned locations, and these are sewn together while activating the exchange reaction of the covalent bond again by heating or light irradiation. By this step, a fiber reinforced resin composite is obtained. In addition, you may fasten with a stapler using a metal needle instead of stitching. By doing so, the strength is strong because the reinforcing fiber portions are entangled and joined, and a large structure can be manufactured with only a small manufacturing apparatus, so that the manufacturing cost can be kept low.

  When producing a fiber reinforced resin, several procedures are conceivable: reinforcing fibers impregnated with the resin are stacked and pressurized and heated, or the resin is injected into a mold laid with the reinforcing fibers and heated. Therefore, any conventional method known as a procedure for producing FRP using a thermosetting resin may be selected.

  At this time, there are two cases where the fiber reinforced resin is manufactured as a part specialized for manufacturing a specific structure and when it is manufactured as a general-purpose material applicable to the manufacture of various structures. In the former case, based on the design of how the final structure will be divided, molded and joined, it will be convenient for molding and stitching in the subsequent process, and will be produced in a lean shape and thickness. That's fine. In the latter case, it is basically produced in the shape of a square plate. The size is considered to be about 30 cm square to 2 m square. However, it does not have to be square and may be rectangular. Further, it may be hexagonal so that a structure with a large area can be manufactured by periodically arranging and joining. When a large number of hexagonal fiber reinforced resins are joined side by side, there is a feature that the joining portions do not become a straight line, which may be more desirable than those in which rectangles are arranged in order to improve strength. The thickness of the general-purpose fiber reinforced resin is considered to be in a range of about 0.5 mm to 2 cm, for example.

  In addition, when it becomes a problem that a level | step difference is made in a joining location, it is good to make the thickness of the superimposition part (margin part) superposed for joining beforehand thin about half of other parts. The general-purpose fiber reinforced resin may be of a type in which a portion having a constant width is thinned by assuming that it is simply joined and extended.

  The fiber reinforced resin produced in this way is similar to a prepreg in the sense of a mixture of reinforced fiber and resin before producing a desired structure, but differs greatly in that it has already been thermoset. In the case of using a prepreg, cooling is performed in order to preserve it in a state before curing, but the function tends to be impaired unless molding and curing are performed within about one month. In contrast, the fiber reinforced resin can be easily handled because it has been cured, can be stored at room temperature, and has no time limit to be used.

  Next, the fiber reinforced resin is heated and processed into a desired shape by a method such as pressing. In order to relieve the stress in a bent state, it is preferable to keep the temperature at which the covalent bond exchange reaction is activated even during pressing. In some cases, the molding at this stage may be omitted, and the molding may be performed after the fiber reinforced resin is joined.

  Next, the fiber reinforced resins are joined together by heating and stitching the fiber reinforced resins together to obtain a fiber reinforced resin composite. This point will be described with reference to FIG.

  FIG. 1 is a schematic view of a fiber reinforced resin composite 30 obtained by joining two pieces of fiber reinforced resins 10 and 10 (patchwork multi-material) and joining them by stitching. The fiber reinforced resins 10 and 10 are continuously stitched by a single suture 21. The suture 21 is equivalent to or more than the reinforcing fiber 12 (see FIG. 3) embedded in the fiber reinforced resin 10, 10 such as carbon fiber, glass fiber, metal fiber, synthetic fiber, semi-synthetic fiber, natural fiber, or the like. The one with the strength of is used. The suture 21 is preferably made of a material that has a high affinity with the fiber reinforced resins 10 and 10 and is easy to adjust.

  In FIG. 1, the suture thread 21 is only stitched in one line in a straight line, but a plurality of rows may be sewn. Moreover, it is good also as a seam which is not parallel to a superimposition at a right angle, and is good also as a zigzag hand movement. FIG. 1 illustrates a sewing method equivalent to hand-stitched plain stitching, but it is assumed that sewing is actually performed using a sewing machine. In that case, sewing methods such as main sewing and chain stitching are different from FIG. It may be. In some cases, one suture thread 21 is used on each of the front side and the back side and the two stitches are sewn (see FIG. 3). The shape of the overlapped portion to be sewn is not limited to a straight line, and may be bent or curved, and may have a three-dimensional swell rather than a flat surface.

  The heating of the fiber reinforced resin 10 performed to soften the fiber reinforced resin 10 is performed by a heating device. Further, the stitching between the fiber reinforced resins 10 and 10 performed for stitching the fiber reinforced resins 10 and 10 is performed by a stitching device. Heating and sewing are performed by irradiating microwaves or infrared rays to the area to be stitched, or by pressing a plate similar to an iron heated by an electric heater and heating the sewing machine without taking time. It is performed by sewing using The temperature is preferably set to the same level as when forming before joining. A suitable temperature varies depending on the material composition and blending ratio of the fiber reinforced resin 10, but a typical temperature is about 150 ° C. to 300 ° C.

  The sewing machine (suture device) used here can be sutured by inserting a suture needle 22 into fiber reinforced resins 10 and 10 softened by heating and using a suture 21. Conversely, there may be a policy of setting the processing temperature so that sewing can be performed with the performance of the sewing machine. The temperature at which stitching is possible is determined by the thickness of the fiber reinforced resins 10 and 10 and the composition of the fiber reinforced resin material used. In addition, since the hole pierced with the suture needle 22 is filled again with the fiber reinforced resins 10 and 10 softened by heating, the suture needle 22 is desirably as thin as possible.

  Above all, by joining the heating microwave irradiator or the heating plate (heating device) and the sewing machine and performing suturing while locally heating the front portion of the suture needle 22, the joining work efficiency is improved. In particular, by using a microwave irradiator, heating from the inside becomes possible, and even when a DCB resin having a low thermal conductivity is used, it can be sufficiently softened. Furthermore, when the back of the suture needle 22 is heated in addition to the front part of the needle, the backfilling of the hole vacated by the stitching is promoted and the adhesion between the suture 21 and the fiber reinforced resins 10 and 10 is further improved. The effect can be expected. In addition, by heating the lower portion of the suture needle 22, the heated portion can be reduced while making the suture needle 22 easier to pierce. These places can be appropriately combined and heated.

  In addition, in DCB resin which comprises the fiber reinforced resin 10, recombination of a covalent bond occurs by heating. For this reason, the two fiber reinforced resins 10 and 10 are strongly bonded to each other without using an adhesive only by performing a heat treatment by superimposing them. However, if a catalyst or a curing agent that is a component of the fiber reinforced resin 10 is applied to the adhesive surface before superimposing, the recombination of the covalent bond at the interface is further promoted, and the adhesive properties of the two fiber reinforced resins 10 and 10 are increased. Can be further improved.

  FIG. 2 is a schematic view of a fiber reinforced resin composite 40 obtained by superposing and joining the flat fiber reinforced resin 10 and the bent fiber reinforced resin 10 together by stitching. In FIG. 1 described above, the two ends of the flat fiber reinforced resins 10 and 10 are joined to each other, but the fiber reinforced resins 10 and 10 having different shapes are joined to each other as shown in FIG. May be. By joining in this way, it is possible to produce a complex structure with strong strength that can never be obtained by simply pressing a flat plate.

  FIG. 3 is a cross-sectional view of a fiber reinforced resin composite 50 obtained by stitching two fiber reinforced resins 10 and 10 together. In the example of FIG. 3, unlike the case of FIG. 1 described above, it is assumed that a sewing machine is used for the main sewing. In each of the two fiber reinforced resins 10 and 10, the reinforcing fibers 12 and 12 are present inside thereof. The reinforcing fibers 12 and 12 extend in the surface direction of the DCB resins 11 and 11, respectively.

  One suture 21 is provided on each of the front and back sides of the fiber reinforced resins 10 and 10. And in the overlap part of fiber reinforced resin 10 and 10, boundary part 23 (the neighborhood of boundary part 23 is included) with lower fiber reinforced resin 10 toward the inside (downward) from the surface of upper fiber reinforced resin 10 The suture thread 21 is arranged so as to reciprocate between. Similarly, in the overlapping portion of the fiber reinforced resins 10, 10, the boundary portion 23 (the boundary portion 23 of the boundary portion 23) with the upper fiber reinforced resin 10 from the surface of the lower fiber reinforced resin 10 toward the inside (upward). The suture thread 21 is arranged so as to reciprocate between (including the vicinity). And these two sutures 21 are knitted at the boundary part 23 (joining interface including the vicinity of the boundary part 23) of the two fiber reinforced resins 10 and 10, so that the fiber reinforced resins 10 and 10 are connected to each other. Are overlapped and joined. However, the crossing position does not need to be the center of the two-layered fiber reinforced resins 10 and 10 (the boundary portion 23 and the vicinity thereof), and may be anywhere such as the inside of each of the fiber reinforced resins 10 and 10.

  By simply bonding a normal FRP plate, the reinforcing fibers are not connected via the bonding surface, so the strength in the direction of peeling the two sheets is weak. However, when the stitching is performed in this manner, the reinforcing fiber 12 is fastened by the suture thread 21, so that the strength is significantly increased.

  FIG. 4 is a cross-sectional view of a fiber reinforced resin composite 60 obtained by burying the suture 21 in the fiber reinforced resins 10 and 10 by pulling the suture 21 strongly at the time of suturing. In the example shown in FIG. 4, the surface vicinity portion of the fiber reinforced resin 10 in the suture thread 21 is buried in the DCB resins 11 and 11 constituting the fiber reinforced resin 10 and 10. The softened fiber reinforced resin 10 and 10 are naturally filled with the hole vacated by the suture needle 22 (not shown in FIG. 4) and the crack in the upper part of the suture 21 digging into the fiber reinforced resin 10 and 10, and the joining is completed. Later, the structure can be such that the suture 21 is not exposed at all. Note that by pressing the heating plate again after sewing, the unevenness caused by the buried stitching can be flattened and the backfilling of the holes can be actively promoted.

  In FIG. 4, the ends of the suture 21 are exposed at the start and end of sewing. However, if the knot is tied and buried, the ends of the suture 21 can be buried. Since the suture thread 21 is not exposed, deterioration of the suture thread 21 due to air, moisture, rubbing with a solid matter, or the like can be prevented, and the durability of the strength of the joint portion between the fiber reinforced resins 10 and 10 is improved.

  In order to enable such buried sutures, it is preferable that the fiber reinforced resins 10 and 10 are sufficiently softened by heating. For this reason, in FIG. 3 described above, it is sufficient that the suture needle 22 is soft enough to penetrate easily. However, as shown in FIG. It is preferable to have a softness enough to be buried. Such flexibility can be realized by adjusting the composition of the DCB resin, the curing agent, and the catalyst constituting the fiber reinforced resins 10 and 10 and setting the temperature at the time of sewing operation. However, since the strength at the time of curing tends to decrease when the composition is highly flexible, it is preferable to adjust the strength within a range satisfying the strength required for the fiber reinforced resin composite 60.

  FIG. 5 is a cross-sectional view of a fiber reinforced resin composite 70 in which a protective film 13 is formed by applying a DCB resin before curing to a stitched portion and heating and curing after normal stitching as in FIG. is there. In this case, the degree of heating of the DCB resin 11, 11 is lower than the degree shown in FIGS. 1 to 4, and the hole left on the surface through the suture 21 is blocked by the melting of the DCB resin 11, 11. Absent. Therefore, by applying DCB resin before curing so as to cover the remaining holes, and heating and curing, the remaining holes are closed and the suture 21 is covered with the protective film 13. In addition, this protective film 13 is comprised with the material (namely, resin containing a dynamic covalent bond) similar to the DCB resin 11 among the said fiber reinforced resin 10. FIG. Therefore, the protective film 13 (coating) obtained after curing is integrated with the fiber reinforced resin 10, that is, a part of the fiber reinforced resin 10.

  The temperature at which the applied DCB resin is cured is usually lower than the temperature at which the DCB resin is softened by reheating and molding or stitching is performed, for example, about 100 ° C. to 200 ° C. And it is preferable to hold | maintain at this temperature for about 2 hours-12 hours for hardening.

  In addition, although not illustrated as a joining method related to the stitching, the two fiber reinforced resins 10 and 10 are fastened (joined) with a metal needle (stapler needle) using a stapler after heating or simultaneously with heating. There is also a method. Since the needle penetrates and holds the reinforcing fibers 12 included in the two fiber reinforced resins 10 and 10, the strength against pulling in the peeling direction is only when the fiber reinforced resins 10 and 10 are bonded. Compared to improvement. When using the stapler needle, it is preferable that the fiber reinforced resins 10 and 10 of the portion to be fastened by the stapler needle are heated and softened in advance by a heating device similar to the heating device.

  Also, the structure of the stapler is simpler and less expensive than the sewing machine. Moreover, the joint strength increases by increasing the number of joints by the stapler. Therefore, depending on the balance between the use of the structure, the required durability, and the manufacturing cost, joining with a stapler is also an option. In addition, when the apparatus which heats resin is attached to the crimping | compression-bonding part of a stapler, it becomes possible to perform heating and joining by one operation | movement, and the working efficiency of joining improves.

  Depending on the structure of the target structure, the fiber-reinforced resin 10 or 10 is joined after being bent or stamped. In this case, the part that needs to be deformed is heated and molded. Thereby, the target structure is completed. And the structure produced with the fiber reinforced resin 10 and 10 has the advantage that repair by reheating is possible even if a crack resistance is high and a crack generate | occur | produces.

  According to the above example, a lightweight, high-strength, large and complex structure made of a hardened fiber reinforced resin that is easy to handle, conserves, is versatile and inexpensive, and is inexpensively processed and bonded. Can be provided. This structure also has the advantage of high crack resistance, which is a characteristic of fiber reinforced resin, and can be repaired by reheating even if cracks occur.

  In the above example, the fiber reinforced resin whose dynamic covalent bond is activated by heating is exemplified. Therefore, a method for producing a fiber reinforced resin using a DCB resin whose dynamic covalent bond is activated by light irradiation and manufacturing a large and complex structure with light weight and high strength at low cost will be shown. .

  Various materials can be considered for the DCB resin activated by light irradiation. One example is a crosslinked polymer obtained by radical polyaddition reaction of a tetrafunctional thiol derivative and a bifunctional vinyl ether derivative. And those obtained by copolymerization by adding a ring-opening polymerizable monomer. When light irradiation is performed, radicals are generated from the photoinitiator remaining in the polymer matrix, and the allyl sulfide bond exchange reaction is activated.

  The rough production method of the fiber reinforced resin is the same as that in the case of using the resin material in which the dynamic covalent bond is activated by the heating, but the resin material to be used is different. It is produced by applying the above conditions.

  When processing the shape of the fiber reinforced resin by a press or the like, it is preferable to sufficiently irradiate light before pressing in order to facilitate the processing. In particular, unlike the case of activation by heating, it is difficult to irradiate light during pressing. For this reason, after the press is completed, if stress relaxation is not sufficient and a force to return to the original shape is applied, the fiber reinforced resin is partially held and the deformed shape is maintained while light irradiation is performed to reduce the stress. It is encouraged to relax sufficiently.

  Next, a suturing operation is performed while performing light irradiation. The operation is the same as in the above example except that light irradiation is performed instead of heating. Further, when partial deformation or repair is necessary, partial light irradiation is performed in a process in which heating is partially performed in the above example. Even if it does in this way, even after fiber reinforced resin is joined, the fiber reinforced resin composite which has sufficient durability and can be manufactured cheaply is obtained.

DESCRIPTION OF SYMBOLS 10 Fiber reinforced resin 11 DCB resin 12 Reinforced fiber 13 Protective film 20 Fiber reinforced resin composite 21 Suture 22 Needle 23 Boundary part 30 Fiber reinforced resin composite 40 Fiber reinforced resin composite 50 Fiber reinforced resin composite 60 Fiber reinforced resin composite Body 70 Fiber-reinforced resin composite

Claims (8)

It is constituted by joining a plurality of fiber reinforced resins having a resin including a dynamic covalent bond as a matrix resin and a reinforcing fiber disposed inside the resin,
A fiber reinforced resin composite, wherein the fiber reinforced resin composites are joined together by stitching the fiber reinforced resins together with a suture thread.   The fiber-reinforced resin composite according to claim 1, wherein the fiber-reinforced resins are continuously stitched together by a single suture.   The fiber reinforced resin composite according to claim 1 or 2, wherein a portion of the suture thread near the surface of the fiber reinforced resin is buried in the resin constituting the fiber reinforced resin. Two of the above-mentioned fiber reinforced resins are overlapped and bonded together in a predetermined manner,
In the superposed overlapping part,
The suture is arranged so as to reciprocate between the surface of one fiber reinforced resin and the other fiber reinforced resin toward the inside,
The suture is arranged so as to reciprocate between the surface of the other fiber reinforced resin and the one fiber reinforced resin toward the inside,
The fiber reinforced resin is bonded to each other by knitting a suture sutured from the surface of the one fiber reinforced resin and a suture sutured from the surface of the other fiber reinforced resin. The fiber-reinforced resin composite according to claim 1 or 2, characterized by the above.   The resin film including the dynamic covalent bond is formed so as to cover a hole through which the suture thread is formed, which is formed on the surface of the fiber reinforced resin. Fiber reinforced resin composite. An apparatus for producing the fiber-reinforced resin composite according to claim 1 or 2,
A suturing device comprising a suturing needle for suturing the fiber-reinforced resins with the suture;
A heating device that heats and softens the resin existing in at least one of the front and lower sides of the suturing needle and the front and rear sides of the suturing needle in a direction in which the needle is moved by the suturing device; An apparatus for producing a fiber reinforced resin composite, characterized in that: It is constituted by joining a plurality of fiber reinforced resins having a resin including a dynamic covalent bond as a matrix resin and a reinforcing fiber disposed inside the resin,
A fiber reinforced resin composite, wherein the fiber reinforced resins are fastened with a stapler needle. An apparatus for producing the fiber-reinforced resin composite according to claim 7,
A stapler for fastening the fiber reinforced resins together with the stapler needle;
An apparatus for producing a fiber-reinforced resin composite, comprising: a heating device that heats and softens the resin present at a position fastened by the stapler.

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