JP2002144439A - Lapping tape for molding fiber-reinforced plastic and fiber-reinforced plastic as well as its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lapping tape for molding an FRP easy to be released capable of giving a sufficient molding pressure at a curing time as the lapping tape by eliminating or reducing polishing after molding. SOLUTION: The lapping tape for molding the fiber-reinforced plastic comprises a rough surface having a surface roughness (Ra) specified by JIS B 0601-1982 of a range of 10 to 100 μm on at least one side surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping tape for molding fiber-reinforced plastic (hereinafter referred to as FRP), a method for producing an FRP using the tape, and an FRP produced thereby.

[0002]

2. Description of the Related Art Conventional FRPs, particularly FRP pipes, are formed by impregnating a thermosetting resin such as an epoxy resin into a carbon fiber, a glass fiber, or the like, winding the layer around a mandrel, laminating, and then forming an FRP on the surface thereof. A wrapping tape is wrapped to fix the fibers so that the fibers do not fall off, and to apply molding pressure to the fibers by utilizing the heat shrinkage of the tape. Then, after heating and curing, a method is employed in which the mandrel is pulled out and the wrapping tape is removed.

[0003] In such a conventional method, a polyester film or a polypropylene film is used as a wrapping tape for the purpose of fixing fibers and applying molding pressure during curing.

[0004]

However, in the conventional wrapping tape, a release agent is indispensable for peeling off the FRP. In order for the release agent to remain on the surface of the FRP molded product and to perform pipe surface processing (for example, rubber winding),
It must be removed (polished). This causes a problem of an increase in the number of processing steps after molding and a decrease in strength due to cutting of a surface fiber of the pipe-like material.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wrapping tape for FRP molding which is easy to release and which requires no or a small amount of polishing after molding and which can apply a sufficient molding pressure during curing as a wrapping tape. .

[0006]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the wrapping tape for FRP molding of the present invention has a fiber reinforced plastic molding characterized by having a rough surface having a surface roughness (Ra) in the range of 10 to 100 μm specified in JIS B 0601-1982 on at least one surface. Wrapping tape.

Further, the method for producing an FRP according to the present invention comprises:
In producing a fiber-reinforced plastic using the fiber-reinforced plastic molding wrapping tape, a reinforcing fiber impregnated with a thermosetting resin is wound around a mandrel, and the rough surface of the wrapping tape is placed on the reinforcing fiber side. And molding by heating and heating.

[0008] The FRP of the present invention is formed by the above-mentioned method or JIS B0601-1982.
Has a surface shape having a surface roughness (Ra) in the range of 10 to 100 μm.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. As for the numerical value of the non-SI unit, the value converted to the SI unit is also shown in parentheses.

[0010] The wrapping tape of the present invention is made of plastic, and can be applied with molding pressure by the tape made of the above-mentioned material. This film is 180 ° C
Heat resistance (preferably 180 ° C. or higher, more preferably 200 ° C. or higher) because there is a curing step of heating and curing FRP plastic, that is, a thermosetting resin in a temperature environment before and after.
Is preferred, for example, polyester, nylon, polycarbonate, etc., and the thickness is preferably 5 to 50 μm in consideration of workability and resistance to applied pressure. (10 to 40 μm is more preferred, and still more preferably 20 to 30 μm). Further, in order to prevent the FRP resin before curing from leaking to the outer surface, there is substantially no pinhole conducting from one surface of the tape to the other surface (10 / m).
² and / or a diameter of 10 μm or less).

[0011] At least one side of the tape of the present invention is JI
Surface roughness (Ra) specified in SB0601-1982
Is a rough surface in the range of 10 to 100 μm. Due to its shape, it has easy peelability from the thermosetting resin. Here, the term “easy peeling property” refers to a property of easily peeling from a thermosetting resin after heat curing without a release agent. Therefore, by setting this surface as the surface on the reinforcing fiber side impregnated with the thermosetting resin, the wrapping tape can be removed after the resin is cured by heating without a release agent. The surface roughness is preferably 20 to 80 μm, more preferably 40 to 60 μm.
m. If the surface roughness is less than 10 μm, a large amount of tape member remains on the pipe when removing the tape because the rough surface modeling is thin and weak, and it is necessary to remove it. If it exceeds 100 μm, a large amount of air will be formed in the concave portion on the surface, and a problem will occur in the next step (for example, rubber winding).

In addition, the shape of the rough surface of the wrapping tape of the present invention is preferably a woven fabric pattern in view of the simplicity of production and the like. The fabric pattern may be the actual fabric itself. For example, the woven fabric may be laminated, bonded, adhered, or embedded on a tape, or conversely, one side of the woven fabric may be coated with plastic, or the inside of the woven fabric may be impregnated with the plastic and solidified. Alternatively, one side of the woven fabric may be denatured by heat, pressure, or chemical action to form a film. Alternatively, as described above, the tape of the present invention does not have to have an actual woven fabric, and the rough surface may have only a woven fabric pattern. For example, the fabric itself is pressure-bonded to the surface of the softened tape (when a normal polymer is used, the pressure-bonded fabric itself may be softened, so it is preferable to use a heat-resistant, hardly-soluble polymer or metal fabric). Then, the shape of the woven fabric may be transferred, or a metal roll or the like on which the shape of the woven fabric is copied (for example, the woven fabric is cast with gypsum and the like is cast into a female mold to cast metal). Or may be impressed with a metal fabric. In the case where these direct woven fabrics are not used, those corresponding to the fibers of the woven fabric are included in the fibrous shape together with the fibers of the actual woven fabric. When a pattern is formed from a woven fabric as described above, the shape of the woven fabric may be a negative shape inverted from the shape of the original woven fabric (such as a concave shape if the original is convex).

Hereinafter, preferred forms of the woven pattern will be described.
The present invention will be described using an example in which the tape of the present invention has an actual fabric (in this case, the fabric itself is a fabric pattern). However, the present invention is not limited to this. It may be a tape or the like having only a woven shape (or can be compliant). Regarding the diameter of the fibrous material of the woven fabric pattern, the warp is 30 to 150 d ｛3.3 to 1
6.7Tex｝ (more preferably, 50 to 120d ｛5.
6 to 13.3 Tex｝, more preferably 60 to 100 d
{6.7 to 11.1 Tex}), weft 30 to 150d
{3.3-16.7 Tex} (more preferably, 50-1
20d {5.6-13.3 Tex}, more preferably 60
~ 100d {6.7 ~ 11.1 Tex}) is preferable. If the value is below the lower limit of the numerical range, the thread diameter is thin and weak, so that the thread remains on the pipe side when the tape is removed, so that it is necessary to remove the thread. This is because air accumulation may occur, causing a problem in the next step (for example, rubber adhesion), which is not preferable. The number of fibers to be woven is 45 to 240 / inch {45 to 240 / 2.54 cm}.
Is preferred. More specifically, the driving of sutras 60 to 240
Book / inch {60-240 book / 2.54 cm} (more preferably, 80-200 book / inch {80-200 book / 2.54c)
m｝, more preferably 90 to 150 pieces / inch ｛90 to 1
50 / 2.54cm｝), weft driving 45-180 / inch
{45 to 180 / 2.54 cm} (more preferably, 50 to 180
120 / inch {50-120 / 2.54cm}, more preferably 60-100 / inch {60-100 / 2.54c
m｝) is preferred. This is because if the value is below the lower limit of the numerical range, the yarn diameter is thin and weak, so that the thread remains on the pipe side when removing the tape, so that it is necessary to remove it. This is because air accumulation may occur, causing a problem in the next step (for example, rubber adhesion), which is not preferable. Examples of the weave structure include plain weave and satin weave, but plain weave is preferable to satin weave, which has few texture points and lacks the rigidity of the fabric.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

In the embodiment shown in FIG. 1, an example is shown in which the wrapping tape 1 of the present invention comprises a laminated tape having a two-layer structure which is a hybrid consisting of laminating a first layer and a second layer. Have been.

The first layer 2 is made of a plastic film and has a thickness of 5 to 5 in view of workability and pressure resistance to applied pressure.
0 μm is preferred. The heat shrinkage is preferably from 1.1 to 1.5%.

It is also preferable that the second layer 3 is made of a woven fabric having a releasability from a thermosetting resin. When the woven fabric is too thin, the fiber pieces are detached from the woven fabric during peeling and remain on the thermosetting resin side, and when the woven fabric is too thick, the flexibility or the like deteriorates and the workability is deteriorated, which is not preferable. is there. Therefore, the thickness is preferably 80 to 120 μm, and 90 to 110 μm.
μm is more preferred. In addition, when the wrapping tape of the present invention has a woven fabric, the woven fabric has a higher Young's modulus than a film, so the elongation during heat curing is small, and the surface step generated in the formed FRP pipe is reduced. ,preferable. FR combining reinforced fiber and plastic
The content of the reinforcing fiber when it becomes P is 40 to 65% by volume.
Is preferable, 50 to 60% by volume is more preferable, and
58% by volume is more preferred.

Such a wrapping tape is formed by, for example, laminating the second layer of a polyester fabric and the first layer of a polyester film. In use, the polyester-based woven fabric is on the reinforcing fiber side impregnated with a thermosetting resin.

The method for laminating the two layers is not particularly limited, and it is sufficient to laminate a polyester-based fabric layer and a polyester-based film layer. For example, polyurethane adhesive, epoxy adhesive, by gravure coating method,
The first and second layers are laminated by applying a polyvinyl chloride adhesive.

The woven fabric or film of the present invention is not limited to the polyester type. For example, the woven fabric may be nylon and the film may be polypropylene.

In the method for producing FRP using the wrapping tape for FRP of the present invention, a conventional production method can be used as it is, except that the tape is used and a release agent is not required. Next, the manufacturing method will be described, but the following numerical ranges are all preferable examples, and are not limited at all. First, 10 to 20 reinforcing fibers impregnated with plastic using a filament winding device or the like are previously coated with a mold release agent on the surface to obtain a diameter of 5 mm.
Filament winding on a metal mandrel surface of ３０30 cm at an angle of 10１０〜30 ° with respect to the major axis direction of the mandrel. In addition, the inner surface of the FRP roll does not generally cause a problem even if the release agent remains in practical use. Then, after removing the excess plastic, as shown in FIG. 2, the tape of the present invention is preferably wound at a winding angle of 80 to 87 ° with respect to the longitudinal direction of the mandrel, the degree of overlap is 1/2 to 1/3, and the tension is increased. With 3 to 10 kg. Then, after shaping the end part and shaping it, it is cured by heating at 170 to 190 ° C. for 5 to 10 hours. After allowing to cool to a suitable temperature, the wrapping tape is peeled off. In addition, after peeling, the release agent removing operation of the FRP surface is unnecessary, but particularly when the wrapping tape has a woven fabric, since the fibers of the woven fabric may remain on the FRP surface, It may be preferable to perform a slight polishing treatment with sandpaper or the like as appropriate by visual confirmation. In this case, it is preferable to use the impregnated plastic and the wrapping tape in which the color tone of the woven fiber is greatly different so as to be easily viewed.

As the reinforcing fibers of the FRP, carbon fibers and glass fibers are preferable, and carbon fibers are particularly preferable. The reinforcing fiber has a single fiber diameter of 5
10 μm to 10 μm, and a single fiber of 6000 to 120
It is also preferable to form a bundle of 00 fibers. Note that FP
As the plastic of R, the curing condition is around 180 ° C., so that it is preferable to have heat resistance. In a specific example, an epoxy resin or the like is preferable.

When the wrapping tape of the present invention is used, the surface shape is FRP having a surface roughness (Ra) in the range of 10 to 100 μm specified in JIS B 0601-1982.
Is obtained, and in some embodiments, a FRP having a woven pattern is obtained. For example, in the case of producing a rubber roll from the FRP pipe or the like, of course, the surface can be polished and used. Is good and may be preferable.

[0024]

EXAMPLES Examples of the wrapping tape of the present invention and molding using the same will be described below.

Example 1 The wrapping tape had a two-layer structure as shown in FIG. That is, a polyethylene terephthalate film having a thickness of 25 μm was used as the first layer. As the second layer, warp 75d driving 120/inch@120/2.54c
m｝, weft 75d ｛8.3Tex｝ 90 hits / inch
A {90 / 2.54 cm} polyester plain fabric was used.

The above-mentioned first and second layers were laminated via an adhesive to obtain a wrapping tape 1 of the present invention having a laminated tape structure with a width of 50 mm.

Using this wrapping tape 1, CFR
When a cylindrical product (pipe) of P was molded, the releasability of the wrapping tape 1 after heating and curing of the resin was good even without a release agent, and the surface of the CFRP molded product almost required polishing. It was possible to carry out rubber winding processing in a state where it did not. Also, no resin permeated the polyester film of the first layer 2.

The surface of the obtained CFRP pipe had a weave pattern. After a primer treatment, a rubber roll was formed by laminating the rubber, which was good.

[0029]

As described above, when the wrapping tape for FRP molding of the present invention is used, it has good releasability from a thermosetting resin without a release agent treatment and has sufficient strength. In addition, a high molding pressure can be applied during heat shrinkage.

Further, in the manufacturing method using the wrapping tape, the surface step is small, and the surface polishing after molding is not required. Therefore, it is the most suitable method for a rubber wound pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wrapping tape according to one embodiment of the present invention.

FIG. 2 is a perspective view in which a wrapping tape according to one embodiment of the present invention is wound.

[Description of Signs] 1: Wrapping tape 2: First layer (polyethylene terephthalate film) 3: Second layer (polyester fabric) 4: Adhesive layer 5: FRP layer 6: Mandrel

Claims (12)

[Claims] 1. A wrapping tape for molding a fiber-reinforced plastic, wherein at least one surface has a rough surface having a surface roughness (Ra) specified in JIS B 0601-1982 in the range of 10 to 100 μm. 2. The wrapping tape for molding a fiber-reinforced plastic according to claim 1, wherein the shape of the rough surface is a woven pattern. 3. The fiber-shaped material having a woven pattern has a diameter of 3.3-1.
The wrapping tape for molding a fiber-reinforced plastic according to claim 2, wherein the wrapping tape is in a range of 6.7 Tex. 4. The number of fibers to be woven into a textile pattern is four.
The wrapping tape for molding a fiber-reinforced plastic according to claim 2 or 3, wherein the wrapping tape is in a range of 5 to 240 pieces / 2.54 cm. 5. The wrapping tape for molding a fiber reinforced plastic according to claim 2, wherein the woven pattern has a weave structure of plain weave or satin weave. 6. A wrapping tape for molding a fiber-reinforced plastic according to claim 1, wherein a woven fabric is provided on the side having a rough surface. 7. The wrapping for molding a fiber-reinforced plastic according to claim 1, wherein the wrapping has a two-layer structure of a first layer made of a plastic film and a second layer having the rough surface. tape. 8. The wrapping tape for molding a fiber reinforced plastic according to claim 7, wherein the first layer is made of a polyester film and the second layer is made of a polyester fabric. 9. The wrapping tape for molding a fiber-reinforced plastic according to claim 7, wherein the first layer and the second layer are adhered. 10. When producing a fiber-reinforced plastic using the wrapping tape for molding a fiber-reinforced plastic according to any one of claims 1 to 9, a reinforcing fiber impregnated with a thermosetting resin is wound around a mandrel. A method for producing a fiber-reinforced plastic, comprising: wrapping the wrapping tape thereon such that the rough surface thereof is on the reinforcing fiber side, and heating and molding the wrapping tape. 11. A fiber reinforced plastic produced by the method according to claim 10. 12. A fiber-reinforced plastic having a surface shape having a surface roughness (Ra) specified in JIS B 0601-1982 in a range of 10 to 100 μm.