JPH06206272A - Reinforced fiber sheet - Google Patents

Abstract

PURPOSE:To give fine impregnation of matrix resin, and enable reinforcement to be executed excellently at a reinforcing site, and moreover raise the reinforcing strength at the time of reinforcing, in use of fiber reinforced plastic, constructions Including a bridge, high level road and the like. CONSTITUTION:The reinforced fiber sheet 1 includes a support body and a reinforced fiber layer 4 consisting of reinforcing fiber arranged on the support body 2 in one direction via an adhesive layer 3, the support body 2 being in the form of a mesh having a fiber distance of 1-50mm. Furthermore, an adhesive resin layer 5 can be formed on the surface of the reinforced fiber layer 4.

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 be reinforced at a reinforcement site with good workability and also has an improved reinforcement strength. It is a reinforced fiber sheet that enables INDUSTRIAL APPLICABILITY The reinforcing fiber sheet of the present invention can be used not only for reinforcing work of a structure, but also suitably for manufacturing a small boat made of fiber reinforced plastic by hand layup.

[0002]

2. Description of the Related Art Recently, bridge piers such as bridges and elevated roads have been reinforced with fiber reinforced plastics. As described in JP-A-3-222734, JP-A-3-224901, etc., the applicant of the present invention is able to perform reinforcement at a reinforcement site with good workability and to reinforce a structure having improved reinforcement strength. We proposed a reinforced fiber sheet for. FIG. 6 shows an outline of this reinforcing fiber sheet.

That is, the reinforcing fiber sheet 1 has the adhesive layer 3
And the support 2 provided with the adhesive 2 and the support 2
And a reinforcing fiber layer 4 composed of reinforcing fibers arranged in one direction and bonded. The reinforcing fiber sheet 1 is used to reinforce a bridge or an elevated road by impregnating the reinforcing fiber layer 4 with a matrix resin and hardening the resin at a site of reinforcement such as a bridge or an elevated road.

[0004]

[Problems to be Solved by the Invention] This reinforcing fiber sheet 1
Impregnation of the upper reinforcing fiber layer 4 with the matrix resin is performed before the sheet 1 is attached to the periphery of the reinforced portion, or the matrix resin is applied to the periphery of the reinforced portion and the sheet 1 is attached from above. It has been practiced to impregnate the reinforcing fiber layer with the matrix resin by pressing. However, in order to improve the impregnation property of the matrix resin into the reinforcing fiber layer, the support 2 of the reinforcing fiber sheet 1 is made of a glass fiber cloth sheet or the like,
After affixing to the periphery of the reinforced portion, a matrix resin is applied from the support 2 side to impregnate the reinforcing resin with the matrix resin.

However, according to the results of the research and experiment conducted by the present inventors, even when the support 2 is made of a glass fiber cloth sheet as described above, the matrix resin is efficiently converted into the reinforcing fiber layer from the support 2 side. It was found that uniform impregnation was extremely difficult or workability was extremely poor. Similarly, it was found that the use of scrim cloth, glass paper, glass non-woven fabric, polyamide, non-woven fabric of various polymers such as PPS (polyphenylene sulfide), which has been conventionally used as the support 2, is not preferable.

[0006] The inventors of the present invention, when using a mesh body having a yarn interval of 1 to 50 mm as the support 2, favorably retains the reinforcing fibers, is excellent in handleability, and is a support. Excellent matrix resin impregnation from the 2 side, therefore
It was found that the workability at the reinforcement site was good. The present invention is based on the novel findings of the present inventors.

Further, the reinforcing fiber sheet 1 shown in FIG.
Also had the following problems.

That is, the reinforcing fiber layer 4 on the support 2 is formed, for example, by stacking a large number of carbon fibers (bundles) obtained by bundling a plurality of filaments with a sizing agent. Only the carbon fibers located in the lower layer of the layer 4 are only lightly adhered to the support 2 via the adhesive layer 3, and the carbon fiber is only produced during the production and storage of the reinforcing fiber sheet 1 or at the site of reinforcement. When the reinforcing fiber layer 4 is impregnated with the matrix resin or when the reinforcing fiber sheet 1 is attached to the reinforcing portion, the upper layer portion of the reinforcing fiber layer 4 may be fluffed. In order to prevent fuzzing, considerable care is required in handling the reinforcing fiber sheet 1, and there is a problem in working efficiency.

In order to prevent such fluffing,
When the concentration of the carbon fibers used was made stronger, the impregnability of the matrix resin into the reinforcing fiber layer 4 deteriorated, which became a larger problem.

The present inventors formed a sticky resin layer by uniformly applying a liquid resin on the reinforcing fiber layer 4 at a predetermined ratio with respect to the basis weight of the reinforcing fiber to be used to form fluff. It has been found that, even when a fiber bundle having a stronger focusing property is used as the reinforcing fiber, the impregnation property of the matrix resin into the reinforcing fiber layer 4 can be improved.

Accordingly, an object of the present invention is to provide an excellent matrix resin impregnation property when reinforcing a structure such as a bridge or an elevated road with a fiber reinforced plastic, and to reinforce the workability at the site of reinforcement. An object of the present invention is to provide a reinforced fiber sheet that can be formed and also has an improved reinforcing strength.

Another object of the present invention is to provide a reinforced fiber sheet suitable for making a small boat or the like by hand lay-up with a reinforced fiber plastic.

Still another object of the present invention is to prevent fluffing during handling, to enable easier handling, and to reinforce structures such as bridges and elevated roads with fiber reinforced plastic, Alternatively, it is to provide a reinforced fiber sheet excellent in impregnation with a matrix resin when a small boat or the like is manufactured by hand layup using the reinforced fiber plastic.

[0014]

The above object can be achieved by the reinforcing fiber sheet according to the present invention. In summary, the present invention is
At least a reinforcing fiber sheet having a support and a reinforcing fiber layer in which reinforcing fibers are arranged in one direction on the support via an adhesive layer and bonded to the support, wherein the support has a space between yarns. Is a reticulated body having a size of 1 to 50 mm. Preferably, 0.1 wt% to 25 wt% with respect to the reinforcing fiber on the reinforcing fiber layer.
The adhesive resin layer formed by uniformly applying the liquid resin in the range of 10% is provided.

[0015]

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

The reinforcing fiber sheet 1 of the present invention comprises a support 2
And a reinforcing fiber layer 4 made of reinforcing fibers that are arranged in one direction and bonded on the support 2 via an adhesive layer 3.

In the present invention, the support 2 has a structure shown in FIG.
As shown in (B), a biaxial (FIG. 3 (A)) or triaxial (FIG. 3 (B)) mesh is used, and the spacing (L) between the yarns is
It is set to 1 to 50 mm. When the distance (L) is less than 1 mm, it becomes difficult to efficiently impregnate the reinforcing resin uniformly with the matrix resin from the support 2 side, and the workability deteriorates. On the other hand, when the distance (L) exceeds 50 mm, it becomes difficult to hold the reinforcing fiber layer 4 on the support 2, and a problem occurs in handling.

The fibers used in the yarns for producing the reticulated body 2 include inorganic fibers such as carbon fibers and glass fibers; metal fibers such as stainless steel; polyester fibers,
Organic fibers such as aramid fibers, nylon fibers, polyethylene fibers and acrylic fibers; or natural fibers such as cotton fibers and silk fibers are preferably used. The yarn thickness is preferably a count (tex) of about 1 to 100 g / km. The reticulated body 1 is formed by weaving or knitting such yarns to form a net, or by joining the intersections of the yarns with an adhesive without weaving or knitting to form a net. It is made by

In the present invention, the adhesive for forming the adhesive layer 3 may be, in principle, any adhesive as long as the reinforcing fiber layer 4 can be temporarily adhered to the support 2, but the adhesive is preferably used. It is preferable to use a resin having a high compatibility with the matrix resin. For example, when an epoxy resin is used as the matrix resin, an epoxy adhesive is preferably used. Regarding the thickness of the adhesive layer 3, it is sufficient that the reinforcing fibers 4 can be temporarily adhered to the mesh body 2.
It may be about 50 μm, preferably about 3 to 20 μm.

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

The reinforcing fibers 4 are lightly disintegrated by arranging a plurality of fiber bundles, which are bundled with a sizing agent as filaments, or a fiber bundle that is slightly twisted and bundled on the adhesive layer 3 and crushed from above. As a result, the reinforcing fibers 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 body 2 through the adhesive layer 3 to be adhered. Reinforcing fiber sheet 1
Is obtained.

In this case, the reinforcing fiber layer 4 having a plurality of layers
2A, the fiber bundle 4A is attached to the adhesive layer 3 as shown in FIG.
Densely arranged in one direction on the support 2 via the fiber bundle 4A
Are squeezed from above to bond the lower part of the fiber bundle 4A to the adhesive layer 3 and are densely arranged laterally on the support 2 as shown in FIG. 2 (B). If desired, the fiber bundles 4A may be sparsely arranged on the support 2 with a space therebetween.

The fiber bundle 4A may be opened before being arranged on the support 2. The degree of crushing of the fiber bundle 4A depends on the desired layer thickness of the fiber 4 obtained thereby, but in the case of carbon fiber, a carbon fiber bundle obtained by converging about 12,000 carbon fiber filaments having a diameter of 5 to 15 μm is shown. At this time, crushing this so that the width in the lateral direction is about 5 mm can be given as an example.

After that, if necessary, on the reinforcing fiber layer 4 in order to suppress fuzzing, 0.1 w is added to the reinforcing fiber.
It is also possible to form the adhesive resin layer 5 (FIG. 1) by uniformly applying the liquid resin in the range of t% to 25 wt%.

The adhesive resin layer 5 is uniformly spray-coated with a liquid resin in the range of 0.1 wt% to 25 wt%, preferably 1 wt% to 10 wt% with respect to the reinforcing fibers constituting the reinforcing fiber layer 4. It is formed by applying. If the coating amount of the liquid resin is less than 0.1 wt%, it is not possible to effectively prevent fuzzing, and
When it is more than 5 wt%, the impregnating property of the matrix resin into the reinforcing fiber layer 4 becomes poor.

The liquid resin is 100 to 1 at 20 ° C.
0,000 cps, preferably 500-10,000
For example, epoxy resin, unsaturated polyester resin, vinyl ester resin, vinyl acetate resin, phenol resin, polyvinyl alcohol resin, starch or the like having a viscosity of cps and containing no curing agent can be used.

As described above, when the adhesive resin layer 5 is provided on the reinforcing fiber layer 4, the reinforcing fibers are prevented from fluffing from the reinforcing fiber layer 4, and at the same time, the impregnation property of the matrix resin is improved. Therefore, reinforcing fiber sheet 1 for reinforcement work
Will be easier to handle and workability will be further improved.

Next, one embodiment of the method for manufacturing the reinforcing fiber sheet 1 of the present invention will be described with reference to FIG.

The support 2 in the form of a net is first placed on the release paper 10 and the adhesive 3 is applied from above it.
The support sheet 12 is produced. In this embodiment, the adhesive 3
Is a bis A epoxy resin prepared to have a viscosity of about 10000 cps at 70 ° C., and a coating amount of 15
It was coated on the release paper 10 having the support ² at g / m ² .

The support sheet 1 thus produced
2 is fed to the pressure unit 15 provided with pressure rollers 15a and 15b so as to face the release paper 14 supplied from the release paper roll 13. At the same time, the fiber bundle 4A of the reinforcing fibers 4 is fed between the support sheet 12 and the release paper 14 of the pressing section 15. The fiber bundle 4A is the pressure roller 1
The reinforcing fibers 4 which are pressed by 5a and 15b and a supporting plate (not shown), and which are loosened slightly by this, are bonded to the supporting body 2 on the supporting body sheet 12 via the adhesive layer 3.

Reinforcing fiber sheet 1 thus obtained
After that, the release paper 14 is wound up by the release paper take-up roll 16, and the cover film 18 supplied from the film supply roll 17 is wound on the sheet take-up roll 14 in a state of being covered on the reinforcing fibers 4. Taken. As described above, the adhesive resin 5 may be applied to the surface of the reinforcing fiber layer 4 before covering the reinforcing fiber layer 4 with the cover film 18, if necessary.

A method of reinforcing a structure using the reinforcing fiber sheet 1 of the present invention thus obtained will be described with reference to FIG.
explain.

According to one embodiment, the cover film 1 is used as needed at the site of reinforcement of structures such as bridges and bridge piers of elevated roads.
8 is peeled off, and then the reinforcing fiber layer 4 of the reinforcing fiber sheet 1 is coated and impregnated with a matrix resin by an appropriate coating means such as a roller, a brush, or spraying, and the side of the reinforcing fiber layer 4 is reinforced at the reinforcing portion 15 As a side, the sheet 1 is attached around the reinforcing portion 15 and the release paper 10 is peeled off. In this way, the desired number of sheets 1 are stacked. Preferably, the matrix resin is impregnated from the side of the support 2 with a hand roller or the like every time the layers are laminated. Then, a cover tape is wound on it to cover it, and then it is left as it is or heated to cure the matrix resin.

Thus, the reinforcing fiber sheet 1 of the present invention
When used for reinforcement, it is used by impregnating the reinforcing fiber layer 4 with a matrix resin at the site of reinforcement, but the matrix resin can be cured by leaving it as it is after the sheet 1 is attached to the reinforcement site. Therefore, it is preferable to use a room temperature curable resin as the matrix resin.

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.

As an alternative method, as shown in FIG. 5, a room temperature curable matrix resin 30 is applied around the reinforcing portion 15 to a thickness of, for example, about 100 μm, and then the reinforcing fiber 4 side is reinforced as the reinforcing portion 15 side. Paste the fiber sheet 1,
Then, the release paper 10 is peeled off. Subsequently, the sheets 1 are laminated in a desired number by the same procedure, and finally the reinforcing fibers 4 are impregnated with the matrix resin 30 from the support 2 side. At this time, each time the sheets 1 are laminated, the reinforcing fibers 4 may be impregnated with the matrix resin from the support 2 side. Thereafter, similarly to the above, a cover is provided by winding a pressing tape on the sheet 1, and then the cover is left as it is to cure the matrix resin.

The inventors of the present invention, by the above-described manufacturing method,
Making various reinforcing fiber sheets using various materials,
The impregnability was tested. The results are shown in Table 1. The reinforcing fiber sheets according to the present invention shown in Examples 1 to 11 had good impregnation properties.

It was also found that when a triaxial woven mesh support as shown in FIG. 3 (B) was used, the followability was good and the reinforcing effect was excellent even with a three-dimensional curved surface. .

The impregnating property was evaluated as follows. (1) Epoxy resin (manufactured by Tonen KK,
Product name "FR-E3P") with roller brush 250g /
Apply m ² . (2) The reinforcing fiber sheet is cut into 50 × 50 cm, and is laid on the transparent film so that the reinforcing fiber side faces the transparent film of (1). (3) Furthermore, from the side of the reinforcing fiber sheet, that is, from the support side, the epoxy resin of (1) is applied with a roller brush to 250 g.
/ M ^{2 is} applied. (4) Cure in this state. (5) After curing, the size and number of bubbles remaining between the transparent film and the reinforcing fiber sheet are examined. Bubbles are a × b
In the case of the ellipse, the diameter is (a × b) ^1/2 .

Evaluation Number ◎ Bubbles of 5 mm or more 0 ○ Bubbles of 5 mm or more 1-4 Bubbles of 5 mm or more 5-19 × Bubbles of 5 mm or more 20 or more

[0041]

[Table 1]

The present inventors also conducted a fluffing test on the reinforcing fiber sheet shown in Table 1 above, and further, on the surface of the reinforcing fiber sheet produced as described above, the adhesive resin layer 5 was formed. And this reinforcing fiber sheet 1
Were tested for fluffing and impregnation. The results are shown in Table 2. The reinforcing fiber sheets shown in Examples 12 to 16 have less fluffing and good matrix resin impregnating ability as compared with the examples shown in Table 1 in which the adhesive resin layer 5 is not formed. I understand.

The evaluation of fluffing was performed as follows. (1) The reinforcing fiber sheet is cut into 50 × 50 cm, placed on a flat plate, and its four corners are fixed. (2) From one end of the reinforcing fiber sheet above 45
An air of 5 m / sec was applied to the reinforcing fiber sheet at an angle of ° and in a mode orthogonal to the fibers of the reinforcing fiber sheet.
I applied for 0 minutes. The wind was made to hit the entire surface of the reinforcing fiber sheet.

Evaluation ◎ Almost no fluffing ○ Area of fluffing part is less than 5% of the whole △ △ Area of fluffing part is less than 20% of the total × Area of fluffing part is 20% or more of the whole

[0045]

[Table 2]

[0046]

As described above, in the reinforced fiber sheet according to the present invention, the support for supporting the reinforced fiber layer is a reticulated body having a yarn interval of 1 to 50 mm. When reinforcing structures such as bridges and elevated roads with reinforced plastic, it has excellent impregnation properties with matrix resin, and can be reinforced at the site of reinforcement with good workability and also has the advantage of improving reinforcement strength.
Further, the reinforcing fiber sheet of the present invention can be suitably used when a small boat or the like is manufactured by hand layup using a reinforcing fiber plastic.

Further, according to a preferred embodiment of the present invention, the reinforcing fiber sheet is obtained by uniformly applying a liquid resin on the reinforcing fiber layer in the range of 0.1 wt% to 25 wt% with respect to the reinforcing fiber. Since the adhesive resin layer is provided, fluffing during handling can be prevented and easier handling becomes possible.

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

FIG. 3 is a front view showing an example of a support used in the reinforcing fiber sheet of the present invention.

FIG. 4 is a diagram illustrating an example of a method for manufacturing a reinforcing fiber sheet according to the present invention.

FIG. 5 is a cross-sectional view showing one embodiment of a reinforcing method with a reinforcing fiber sheet of the present invention.

FIG. 6 is a cross-sectional view of a conventional reinforcing fiber sheet.

[Explanation of symbols]

 1 Reinforcing Fiber Sheet 2 Support 3 Adhesive Layer 4 Reinforcing Fiber 4A Fiber Bundle 5 Adhesive Resin Layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location E04C 5/07 8504-2E

Claims (2)

[Claims] 1. A reinforcing fiber sheet comprising at least a support and a reinforcing fiber layer in which reinforcing fibers are arranged in one direction and bonded to the support via an adhesive layer, the support comprising: A reinforcing fiber sheet, which is a net-like body having a yarn interval of 1 to 50 mm. 2. An adhesive resin layer formed on the reinforcing fiber layer by uniformly applying liquid resin in the range of 0.1 wt% to 25 wt% with respect to the reinforcing fiber. The reinforcing fiber sheet according to claim 1.