JPH0531839A - Unidirectionally arranged reinforced fiber sheet - Google Patents

Abstract

PURPOSE:To provide the reinforced fiber sheet arranged in one direction, while when the construction such as a bridge, etc., is reinforced by fiber-reinforced plastic, the reinforcement may be carried out with favorable workability at reinforcing site, its reinforced strength can be improved and it is preferably used in the manufacture of a small boat, etc., by hand lay-up. CONSTITUTION:A reinforced fiber sheet 1 is composed of the substrate sheet 2 which is provided with adhesive layer 3 and has mold release property and resin-unpermeability and the reinforcing fiber 4 arranged in one direction on the substrate sheet 2 through te adhesive layer 3 and stuck thereto. Accordingly, after the reinforcing fiber 4 has been impregnated with the matrix resin of room temperature-curing type and has been stuck to the position to be reinforced at reinforcing site, since the matrix resin is cured by leaving it as it is and fiber reinforced plastic is made, the operational propety of reinforcing process is excellent, and since the reinforcing fiber 4 is arranged in one direction, its reinforced strength is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when reinforcing a structure such as a bridge or an elevated road with a fiber reinforced plastic, can perform reinforcement at a reinforcement site with good workability and also improve the reinforcement strength. It is a unidirectionally arranged reinforcing fiber sheet capable of According to the unidirectionally arranged reinforced fiber sheet of the present invention, it can be suitably used not only for reinforcing the structure but also for manufacturing a small boat made of fiber reinforced plastic by hand layup. it can.

[0002]

2. Description of the Related Art Bridge piers such as bridges and elevated roads have been reinforced with fiber reinforced plastics.

Conventionally, as a method of reinforcement, (1) a method of pasting a cured fiber reinforced plastic to a reinforcement portion of a bridge pier, and (2) a prepreg attached to a reinforcement portion of a bridge pier, on which deformation during heat curing is applied. A method of forming a fiber reinforced plastic by winding a pressing tape to prevent the heat-curing, (3) Wrapping a reinforcing fiber cloth around the reinforced portion of the pier, and applying a room temperature curable matrix resin to it. A method of forming a fiber reinforced plastic by impregnating and holding the pressing tape after winding and curing.
Etc. are known.

[0004]

However, in the method (1) described above, although the efficiency of the reinforcement for the reinforcement portion of the pier is good, there is a big drawback that it cannot be implemented at the curved reinforcement portion. In the method (2), the prepreg attached to the reinforced portion of the bridge pier must be heat-cured on site, so that the work of heat-curing is not easy. In the method of (3), since the reinforcing fiber is used as a cloth by plain weave, twill weaving, etc., the strength of the reinforcing fiber is weak at the position where the warp and the weft cross each other. However, there is a drawback in that it is not possible to obtain a sufficient reinforcing effect.

In addition to the above, a method of winding a fiber of a reinforced fiber impregnated with a resin by a filament winding method on the spot at a reinforced portion of a pier and then hardening it to form a fiber reinforced plastic is considered, but the object to be reinforced is It is not practical because it has the drawbacks of being limited and high in equipment cost.

Therefore, in view of the above-mentioned present situation, an object of the present invention is to reinforce a structure such as a bridge or an elevated road with a fiber reinforced plastic so that the reinforcement can be carried out easily at the site of reinforcement and the reinforcement. An object of the present invention is to provide a unidirectionally arranged reinforcing fiber sheet capable of improving strength.

Another object of the present invention is to provide a unidirectionally arranged reinforcing fiber sheet suitable for making a small boat or the like by hand layup by using the reinforcing fiber plastic.

[0008]

The above object is achieved by the unidirectionally arranged reinforcing fiber sheet according to the present invention. In summary, the present invention provides a releasable and resin-impermeable support sheet provided with an adhesive layer, and the support sheet through the adhesive layer.
A unidirectionally arranged reinforcing fiber sheet, which comprises reinforcing fibers arranged in one direction and adhered on a sheet. Preferably, the support sheet is a release paper or film. An adhesive resin layer can be provided on the reinforcing fibers, and a resin-permeable support can be provided on the adhesive resin layer.

[0009]

1 is a sectional view showing an embodiment of a unidirectionally arranged reinforcing fiber sheet of the present invention.

The unidirectionally arranged reinforcing fiber sheet 1 of the present invention comprises:
It is composed of a support sheet 2 provided with an adhesive layer 3 and reinforcing fibers 4 which are arranged in one direction on the support sheet 2 via the adhesive layer 3 and adhered to each other, such as bridges and elevated roads. The reinforcing fiber 4 is impregnated with the matrix resin at the reinforcing site so that it can be used for reinforcement. Even when a small boat or the like is made by hand layup, the reinforcing fiber 4 can be impregnated with the matrix resin on the spot and used.

According to the present invention, the support sheet 2 comprises:
At the site of reinforcement, workers can withstand the work such as holding the reinforcing fiber sheet 1 in which the matrix resin is impregnated into the reinforcing fiber 4 by hand and pasting it to the reinforcing place, and the work when making a small boat etc. by hand layup. For that reason, it is rigid and flexible. Further, it has releasability and resin impermeability so that it is convenient for peeling the support sheet 2 from the reinforcing fiber sheet 1 after the reinforcing fiber sheet 1 is pasted on the surface of the reinforcing portion. As the releasable and resin-impermeable sheet, for example, release paper, polyamide or polyester,
A film made of polyethylene, polypropylene resin or the like can be used. The thickness of the support sheet 2 is 1 to 500 μm, preferably 5 to 200 μm from the viewpoint of having flexibility and strength capable of supporting the reinforcing fibers 4.

As an adhesive for forming the adhesive layer 3, any adhesive can be used as long as it can at least temporarily bond the reinforcing fibers 4 to the support sheet 2, but preferably the adhesive is a matrix resin. It is preferable to use a resin having a good compatibility with, for example, when an epoxy resin is used as a matrix resin, an epoxy adhesive is used. The thickness of the adhesive layer 3 may be 5 to 100 μm, preferably 10 to 30 μm, as long as the reinforcing fibers 4 can be temporarily bonded.

As the reinforcing fiber 4, pitch-based carbon fiber,
Various fibers such as boron fiber, PAN-based carbon fiber, aramid fiber, glass fiber, steel fiber, polyester fiber and polyethylene fiber can be used. Further, these fibers may be used alone or in combination of two or more to hybridize the fibers.

The reinforcing fibers 4 are lightly separated by arranging a large number of fiber bundles, which are bundled with a sizing agent as filaments, or a fiber bundle that has been slightly twisted and aligned on the adhesive layer 3 and crushed from above. , By this, reinforcing fiber 4
Are laminated in a plurality of layers by binding with a sizing agent or twisting, and are arranged in one direction on the support sheet 2 through the adhesive layer 3 and bonded, and thus the desired reinforcing fiber sheet 1 is obtained.
Is obtained.

In this case, the plurality of layers of the reinforcing fiber 4 are as shown in FIG.
As shown in (A), the fiber bundles 4A are densely arranged in one direction on the support sheet 2 with the adhesive layer 3 interposed therebetween, and the fiber bundles 4A are crushed from above so that the lower portions of the fiber bundles 4A are removed. It may be adhered to the adhesive layer 3 and may be densely provided on the support sheet 2 without a space in the lateral direction, as shown in FIG. 2B, or as shown in FIG. As shown, the fiber bundle 4A is attached to the adhesive layer 3
Are arranged in one direction at intervals on the support sheet 2 in the lateral direction, and the lower part of the fiber bundle 4A is adhered to the adhesive layer 3 by similarly crushing the fiber bundle 4A from above, Figure 3
As shown in (B), they may be provided sparsely on the support sheet 2 at intervals in the lateral direction.

The fiber bundle 4A may be used either with or without the opening between the fibers 4, that is, between the filaments. The degree of crushing of the fiber bundle 4A depends on the layer thickness desired to obtain a plurality of layers of the fibers 4 arranged by this, but in the case of carbon fiber, the carbon fiber filament having a diameter of 5 to 15 μm is 120
As an example, when about 100 carbon fiber bundles are bundled, the carbon fiber bundles are crushed so that the width in the lateral direction becomes about 5 mm.

The unidirectionally arranged reinforcing fiber sheet 1 of the present invention as described above can be manufactured, for example, as shown in FIG.

That is, after the adhesive is applied by the adhesive application roll 7 onto the support sheet 2 supplied from the sheet supply roll 6, the adhesive layer 3 is provided, and then the sheet is formed. A pair of pressure rollers
The rollers 8a and 8b are fed to the pressure section 8 provided with a space therebetween, and at the same time, the fiber bundle 4A of the reinforcing fibers 4 and the release paper 9 from the release paper roll 10 are fed to the pressure section 8. -T2
The fiber bundle 4A is arranged in one direction on the upper adhesive layer 3, and the release paper 9 is laid on it. And in that state, the pressure roller 8
Pressure is applied between a and 8b and a support plate (not shown) to crush the fiber bundle 4A, and at the same time, the reinforcing fibers 4 which are lightly separated by this are bonded to the sheet 2 via the adhesive layer 3. As a result, the unidirectional reinforcing fiber sheet is formed by arranging and adhering the reinforcing fibers 4 in one direction through the adhesive layer 3 on the support sheet 2.
To 1 is obtained. The sheet 1 thus obtained was then covered with the release paper 9 by the release paper winding roll 11 and, if necessary, the cover film 1 supplied from the film supply roll 12.
The sheet 3 is covered with the reinforcing fiber 4 and wound on a sheet winding roll 14.

When the unidirectionally arranged reinforcing fiber sheet 1 of the present invention is used for reinforcement, the reinforcing fiber 4 is impregnated with a matrix resin at the site of reinforcement, and the sheet 1 is attached to the reinforcement portion. A room temperature curable resin is used as the matrix resin so that the matrix resin can be cured by leaving it as it is later. However,
The present invention does not prevent acceleration of curing of the matrix resin by heat curing.

As the room temperature curable resin, an epoxy resin, an unsaturated polyester resin or the like in which the composition of a curing agent and a curing accelerator is adjusted to cure at room temperature can be used.

According to the present invention, the reinforcement of the structure using the unidirectionally arranged reinforcing fiber sheet 1 is performed as follows.

That is, according to one aspect of the present invention, the unidirectionally arranged reinforcing fiber sheet 1 is applied by a suitable application means such as a roller, a brush or a spray at a site for reinforcing a structure such as a bridge or a bridge pier of an elevated road. A room temperature curable matrix resin is applied to and impregnated into the reinforcing fiber 4, and the sheet 1 is attached to the periphery of the reinforcing portion 15 with the reinforcing fiber 4 side as the reinforcing portion 15 side of the structure as shown in FIG. , And the support sheet 2 is peeled off. In this way, the desired number of sheets 1 are stacked. Then, after further impregnating the matrix resin with a hand roller or the like,
The sheet 1 may be made into a fiber reinforced plastic by covering it by winding a pressing tape or the like and then leaving it as it is to cure the matrix resin. This provides reinforcement of the structure with fiber reinforced plastic.

In another embodiment of the present invention, as shown in FIG. 6, a room temperature curing type matrix resin 18 is applied around the reinforced portion 15 to a thickness of, for example, about 100 μm, and then the reinforcing fiber 4 side is reinforced. The unidirectionally arranged reinforcing fiber sheet 1 is attached on the side of 15 and the support sheet 2 is peeled off so that a desired number of sheets 1 are laminated, and at the same time as the attaching, the matrix resin 18 is attached to the reinforcing fibers 4. Impregnate. In this case, each time the next sheet 1 is laminated on the sheet 1 on which the support sheet 2 has been peeled off first and the support sheet 2 has been peeled off, a matrix resin may be further coated on the previous sheet 1. . Thereafter, in the same manner as described above, a cover tape is wound on the sheet 1 to cover the sheet 1, and then the matrix resin is cured by leaving the sheet as it is to convert the sheet 1 into a fiber reinforced plastic. Just do it. This likewise reinforces the structure with fiber-reinforced plastics.

According to the reinforcing method as described above, when reinforcing structures such as bridges and elevated roads with fiber reinforced plastic, reinforcing fibers are arranged in one direction on the support sheet. Since the reinforcing fiber sheet 1 is used and the reinforcing fiber 4 is impregnated with the room temperature curable matrix resin at the site of reinforcement, the sheet 1 impregnated with the matrix resin is used around the reinforcing portion. The matrix resin can be hardened to leave the sheet 1 as a fiber reinforced plastic by being left attached to the sheet, and the sheet 1 can be made into a fiber reinforced plastic, and the workability can be improved without the troublesome work of heating and curing the matrix resin at the reinforcement site. It can be reinforced with fiber-reinforced plastic.

Further, since the reinforcing fibers 4 are arranged in one direction, the strength of the fiber-reinforced plastic is not lowered as in the case where the fibers are crossed, and therefore the reinforcing strength can be improved. Furthermore, since the matrix resin is cured after the sheet 1 is attached to the periphery of the reinforced portion, it is possible to reinforce the curved reinforced portion.

FIG. 7 is a sectional view showing another embodiment of the reinforcing fiber sheet of the present invention. Reinforcing fiber sheet 1 of this example
Then, the feature is that the adhesive resin layer 5 is provided on the reinforcing fibers 4 on the support sheet 2.

The reinforcing fibers 4 on the support sheet 2 are lightly adhered to the support sheet 2 via the adhesive layer 3 in a state of being laminated as a plurality of fiber layers by binding with a sizing agent or twisting. Since it is provided in the reinforcement field, when the matrix resin is impregnated into the reinforcement fiber 4 at the site of reinforcement or when the sheet 1 is attached to the reinforcement portion, care must be taken when handling the sheet 1 to support it from the layer of the reinforcement fiber 4. The reinforcing fibers 4 may be fluffed on the body sheet 2. Therefore, in this embodiment, the adhesive resin layer 5 is provided on the uppermost layer of the reinforcing fibers 4 to prevent the reinforcing fibers 4 from fuzzing. The matrix resin is impregnated into the reinforcing fiber 4 from above the resin layer 5.

For the adhesive resin layer 5 described above, a resin used for an adhesive such as an epoxy resin, a phenol resin, a vinyl acetate, a polyvinyl alcohol, a petroleum resin, or a starch containing no curing agent can be used. The pressure-sensitive adhesive resin layer 5 does not need to be thicker as long as it can prevent fluffing of the reinforcing fibers 4, and it is preferable that the thickness is thin so that the penetration of the matrix resin into the reinforcing fibers 4 is prevented as much as possible. From such a viewpoint, the thickness of the resin layer 5 is 1 to 10
The thickness is about 0 μm, more preferably 5 to 30 μm. The adhesive resin layer 5 is formed on the reinforcing fibers 4 by, for example, a method of spraying a resin from the reinforcing fibers 4 or a method of previously coating the release paper 9 of FIG. 4 with the resin layer 5. be able to.

Reinforcement of the structure using the unidirectional reinforcing fiber sheet 1 of this embodiment may be carried out according to the reinforcing method shown in FIG. 5 or 6 as in the case of the previous embodiment. According to this embodiment, since the adhesive resin layer 5 is provided on the reinforcing fibers 4, it is possible to prevent the reinforcing fibers 4 from being fluffed from the layer of the reinforcing fibers 4 and from the support sheet 2, and thus the reinforcing work. At this time, the reinforcing fiber sheet 1 can be easily handled, and the workability is further improved.

FIG. 8 is a sectional view showing still another embodiment of the unidirectional reinforcing fiber sheet of the present invention. The present embodiment is characterized in that a resin-permeable support 16 is further provided on the adhesive resin layer 5 in order to further prevent the fluffing of the reinforcing fibers 4 during the reinforcing work.

The support 16 is required to be resin permeable so that the matrix resin can be applied on the support 16 to impregnate the reinforcing fibers 4. As the resin-permeable support 16, scrim cloth, glass cloth, glass paper, glass non-woven fabric, polyamide, non-woven fabric of various polymers such as PPS (polyphenylene sulfide) and the like can be used. Support 1
The thickness of 6 may be about 1 to 100 μm, and preferably 5 to 50 μm, for the purpose of preventing fuzzing of the reinforcing fibers 4.

Reinforcement of the construct by the unidirectional reinforcing fiber sheet 1 of this embodiment is carried out according to the reinforcing method shown in FIG. 5 or 6 as in the previous embodiment. According to the present embodiment, since the resin-permeable support 16 is further provided on the adhesive resin layer 5 on the reinforcing fiber 4, the fluffing of the reinforcing fiber 4 can be prevented more reliably, and the reinforcing fiber at the time of the reinforcing work can be prevented. The handling of the sheet 1 is further facilitated, and the workability is further improved.

In the above description, the room-temperature-curable matrix resin impregnated into the reinforcing fiber 4 is the one in which the curing agent and the curing accelerator are blended as usual, but the curing accelerator is not blended in the matrix resin and the reinforcing fiber is not blended. If preliminarily compounded in the adhesive layer 3 of the sheet 1, the reinforcing fibers 4 of the reinforcing fiber sheet 1 are impregnated with the matrix resin at the site of reinforcement, and the curing agent in the matrix resin and the adhesive layer of the reinforcing fiber sheet 1 are impregnated. Since the matrix resin does not cure until the curing accelerator in 3 is mixed, the pot life of the matrix resin can be extended,
Good handleability. Therefore, it is not necessary to perform the reinforcement work immediately in consideration of the hardening of the matrix resin, so that the workability can be further improved.

[0034]

The unidirectionally arranged reinforcing fiber sheet of the present invention is constructed as described above. According to this, when reinforcing structures such as bridges and elevated roads with fiber reinforced plastic, the reinforcement fiber is impregnated with a matrix resin at the site of reinforcement, so that the room temperature curing type matrix is used. By using a resin, a sheet in which reinforcing fibers are impregnated with a matrix resin is pasted around the reinforced portion and left as it is, whereby the matrix resin is cured and the sheet can be made into a fiber reinforced plastic. You can
Reinforcement with fiber-reinforced plastic can be performed easily without the troublesome work of heating and curing the matrix resin at the site of reinforcement. Further, since the reinforcing fibers are arranged in one direction, the strength of the fiber-reinforced plastic does not decrease due to the meandering of the yarn as when the fibers are crossed, and therefore the reinforcing strength can be improved. Further sea
Since the matrix resin is cured after the tongue is attached to the periphery of the reinforced portion, the reinforcement can be performed even in the curved reinforced portion.

Further, the unidirectionally arranged reinforcing fiber sheet of the present invention has flexibility and is moderately firm, and also prevents fluffing of the reinforcing fibers, and is easy to handle. Therefore, it is suitable not only for reinforcing the structure but also for making a small boat by hand layup. Of course, it is also applicable to the manufacture of various products such as high-strength members made of fiber-reinforced plastic for aircraft and machines, high-strength containers made of fiber-reinforced plastic, housings, machine parts and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a reinforcing fiber sheet of the present invention.

FIG. 2 is a cross-sectional view showing one mode of how to arrange fiber bundles of reinforcing fibers in the reinforcing fiber sheet of FIG. 1 and arrangement of the resulting reinforcing fibers.

FIG. 3 is a cross-sectional view showing another mode of arranging fiber bundles of reinforcing fibers in the reinforcing fiber sheet of FIG. 1 and arranging the resulting reinforcing fibers.

FIG. 4 is an explanatory view showing an example of a method for manufacturing the reinforcing fiber sheet of FIG.

5 is a cross-sectional view showing one embodiment of a reinforcing method using the reinforcing fiber sheet shown in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the reinforcing method using the reinforcing fiber sheet shown in FIG.

FIG. 7 is a cross-sectional view showing another embodiment of the reinforcing fiber sheet of the present invention.

FIG. 8 is a cross-sectional view showing still another embodiment of the reinforcing fiber sheet of the present invention.

[Explanation of symbols]

1 Reinforcing fiber sheet 2 Support sheet 3 Adhesive layer 4 Reinforcing fiber 4A fiber bundle 5 Adhesive resin layer 15 Reinforcement points 16 Support 17: Matrix resin

Claims (3)

[Claims] 1. A releasable and resin-impervious support sheet provided with an adhesive layer and unidirectionally arrayed and adhered to the support sheet via the adhesive layer. A unidirectionally arranged reinforcing fiber sheet comprising a reinforcing fiber. 2. The unidirectional reinforcing fiber sheet according to claim 1, wherein an adhesive resin layer is provided on the reinforcing fibers. 3. The unidirectional reinforcing fiber sheet according to claim 2, wherein a resin-permeable support is provided on the adhesive resin layer on the reinforcing fiber.