JPH03282198A - Shaft - Google Patents

Abstract

PURPOSE:To achieve straightness and permit the correction of straightness simply even though the straightness is lost slightly by a method wherein double- layer prepregs, constituted by providing a fiber-reinforced prepreg employing epoxy resin as a matrix resin with a thermoplastic resin film, whose solubility parameter is specified, on the surface thereof, are laminated to integrate them. CONSTITUTION:A double-layer prepreg 1 is provided with a thermoplastic resin film and preferably a thermoplastic urethane elastomer film 8 especially, having the solubility parameter of 9.0-11.5, on a fiber-reinforced prepreg 6 consisting of reinforcing fibers 2 and a matrix resin 4. Epoxy resin is suitable for the matrix resin while the double-layer prepreg 1 is wound around a mandrel. In this case, the film 8 is positioned at the outermost surface. A shaft is obtained by heating and curing a prepreg laminates while preventing the deformation of the prepreg layers by a pressing tape.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to an arrow made of a fiber-reinforced composite resin pipe, and particularly relates to an arrow made of a fiber-reinforced composite resin pipe, and in particular, an arrow made of a deactivated ( details of the arrow).

Previously, for example, the shaft of an arrow, that is, the deactivation shaft, was made of bamboo, but in recent years, as shown in Figure 2, it has been made of bamboo because it is lightweight and has high mechanical strength. From, fiber reinforced composite resin material 1 using carbon fiber or glass fiber as reinforcing fiber
01 into a tube shape has been proposed and put into practical use.

Such deactivation is produced by winding a predetermined number of fiber-reinforced prepregs around a mandrel and curing them.

However, deactivation plates made of fiber-reinforced composite materials produced using such materials and manufacturing methods may be slightly deformed during curing of the prepreg, resulting in problems with straightness. In addition, deactivation caused by deformation can be corrected by polishing the outer surface, but such correction processing is extremely difficult, or even if the straightness can be corrected by correction processing, Changes occur in the wall thickness along the length of the inactivation,
Sometimes there were problems with balance.

Therefore, further improvements are desired from the viewpoint of improving moldability and aesthetics.

As a result of many research experiments, the present inventors discovered that a tubular shape was obtained by laminating multilayer prepreg layers consisting of a thermoplastic resin film with a solubility parameter of 9°0 to 11.5 on the surface of prepreg. When an arrow is made by molding the arrow, very good straightness is achieved, and even if the straightness is slightly out of order, the straightness can be easily corrected without losing balance. I found that. Furthermore, it has been found that thermoplastic urethane elastomer is particularly preferable for the thermoplastic resin film.

The present invention has been made based on this new knowledge.

Therefore, one object of the present invention is to achieve extremely good straightness, and even if the straightness is slightly out of order, it is possible to easily correct the straightness without losing balance. It is an object of the present invention to provide a deactivated material that has good moldability and is improved in terms of breakage prevention and aesthetics.

for The above object is achieved by the inactivation according to the present invention.

In summary, the present invention laminates a multilayer prepreg formed by providing a thermoplastic resin film with a solubility parameter of 9.0 to 11.5 on the surface of a fiber-reinforced prepreg using an epoxy resin as a matrix resin. , is a deactivation characterized by being formed by integrating.

Preferably, the thermoplastic resin film is a thermoplastic urethane elastomer.

To explain further, the deactivation according to the present invention is formed by laminating a plurality of 1° multilayer prepreg layers and integrating them, as shown in FIG. The multi-layer prepreg layer 1° is formed by winding a plurality of multi-layer prepreg l°, which is a feature of the present invention, around a mandrel, or by laminating the multi-layer prepreg l° by continuously winding it several times, and then curing it. Ru.

FIG. 3 shows an embodiment of a multi-layer prepreg l used to form a multi-layer prepreg layer 1 according to the present invention.

According to this embodiment, the multilayer prepreg 1 is made of a thermoplastic resin film having a solubility parameter of 9.0 to 11.5, particularly preferably a thermoplastic A urethane elastomer film 8 is provided.

The thickness of the film 8 is approximately 5 to 1100 u. When the thickness of the film exceeds 1100 LL, the toughness and shock absorption properties are improved, but the decrease in other mechanical strengths, such as tensile strength, compressive strength, and elastic modulus, becomes unignorable. Further, if the thickness of the film 8 is less than 5 μm, it becomes too thin, and as will be described in detail later, post-processing of the outer surface after deactivation molding becomes difficult.

In the present invention, the reinforcing fiber used in the multilayer prepreg 1 is usually carbon fiber, but other reinforcing fibers such as glass fiber, boron fiber, alumina fiber, silicon carbide fiber, and silicon nitride fiber can also be used. Various organic fibers such as aramid fibers, polyarylate fibers, polyethylene fibers, and metal fibers such as titanium fibers, amorphous fibers, stainless steel fibers, and aluminum fibers can be suitably used.

Epoxy resin is suitable as the matrix resin,
Further, a curing agent and other imparting agents, such as a flexibility imparting agent, are appropriately added so that the curing temperature is 50 to 200°C.

Preferred examples of the epoxy resin include (1) glycidyl ether-based epoxy resin (bisphenol A, F, S-based epoxy resin, novolac-based epoxy resin, brominated bisphenol A-based epoxy resin);
(2) Cycloaliphatic epoxy resin; (3) Glycidyl ester-based epoxy resin; (4) Glycidylamine-based epoxy resin (tetraglycidyldiaminodiphenylmethane, triglycidyl-p-aminophenol, etc.);
(5) Heterocyclic epoxy resin: One or more types selected from various other epoxy resins are used, and bisphenol A, F, and S glycidylamine-based epoxy resins are particularly preferably used. Further, as the curing agent, amine-based curing agents such as dicyandiamide (DICY), diaminophenyl sulfone (DDS), diaminodiphenylmethane (DDM); acid anhydride-based curing agents such as hexahydrophthalic anhydride (HHPA), methylhexahydrophthalic anhydride; (MHHPA) and the like are used, and amine-based curing agents are particularly preferably used.

An example of deactivation according to the present invention is as follows.

First, the multilayer prepreg 1 cut into a predetermined shape and size.
(multilayer prepreg layer 1°) is wrapped around a mandrel. At this time, the film 8 is positioned on the outermost surface.

A pressure tape is wound on the prepreg laminate thus wound on the mandrel, and then the prepreg laminate is heated and cured to obtain deactivation while the pressure tape prevents deformation of the prepreg layer.

After curing, after removing the pressure tape from the deactivated surface,
A smoothing process is performed to remove wrinkles on the surface of the cured prepreg product caused by the pressing tape during heat curing. This smoothing process involves heating the film 8 forming the obtained deactivated surface and pressing it to smooth out the wrinkles. It is done by
Wrinkles can be easily absorbed into the film and removed. If necessary, at the same time or after smoothing, the straightness of the deactivation is adjusted without heating.

Moreover, when the film 8 is made transparent, decorative properties can be imparted to the deactivated surface. That is, multilayer prepreg 1
For example, when carbon fibers and other different types of fibers are arranged in one direction to form reinforcing fibers, these different types of fibers can be seen through the surface, and the decorativeness of the deactivated surface can be further improved. In addition, according to the polyurethane resin film, it is also possible to give the surface of the cured prepreg body decorative properties by painting as in the conventional manner.

In fact, as the reinforcing fiber 2, a PAN-based carbon fiber with a fiber diameter of 6.5 μm (manufactured by Toshi Co., Ltd., product name rM4) was used.
0J), a carbon fiber reinforced prepreg 6 was prepared using epoxy resin as the matrix resin, and on this surface,
By pasting a thermoplastic urethane elastomer film 8 with a thickness of 5 μm and a solubility parameter of 1000,
Multilayer prepreg 1 was produced. The solubility parameter was determined from the solubility in the solvent. The matrix resin content of the prepreg 1 is 35% by weight, and the thickness is 8% by weight.
It was 50 μm except for.

In addition, by continuously winding such multilayer prepreg 1 around a mandrel so that the number of laminated layers is 5,
Arrows with deactivation of the structure illustrated in FIG. 1 were manufactured.

The mechanical properties of the arrow were measured, and it was found that the arrow according to the present invention has sufficient mechanical strength despite being lightweight, and has a higher degree of straightness than the conventional arrow shown in Fig. 2. It also had excellent moldability. Additionally, arrows according to the invention were aesthetically pleasing. The measurement results are shown in Table 1.

Table 1 1: Inferior to Comparative Example 1 Note: The solubility parameter of the polypropylene resin was 8.1.

! The arrow according to the present invention constructed as described above is lightweight, has mechanical strength, and has a high degree of straightness.
The moldability was also excellent. Furthermore, the arrow according to the invention is
It is aesthetically pleasing, has toughness, and has the characteristics of not easily breaking.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a deactivation device according to the present invention. FIG. 2 is a cross-sectional view of a conventional deactivation. FIG. 3 is a cross-sectional view of an embodiment of a multilayer prepreg for producing a deactivation according to the present invention. 1°: Multilayer prepreg layer 101: Fiber-reinforced composite resin pipe 1: Multilayer prepreg 2: Reinforced fiber 4: Matrix resin 8: Film

Claims (1)

[Claims] 1) The surface of the fiber-reinforced prepreg using epoxy resin as the matrix resin has a solubility parameter of 9.0~
An arrow shaft characterized in that it is formed by laminating and integrating multilayer prepregs each having a thermoplastic resin film of 11.5.