JPH05318475A - Lightweight prepreg - Google Patents

Abstract

PURPOSE:To provide a lightweight prepreg with which increase in weight is suppressed as small as possible and a grip part or a holding part with a required diameter can be formed and which exhibits excellent impact absorbing properties and good touch during it is used. CONSTITUTION:The title prepreg has a flexible sheet-like cork material 2 wherein both faces are coated with a resin 6 and a fiber-reinforced composite resin layer 4 laminated on at least one face of this sheet-like cork material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is lightweight and particularly excellent in shock absorption. For example, a grip portion for sports and leisure products such as a golf club shaft, a fishing rod, a tennis racket or a bicycle handle, and a hammer. The present invention relates to a lightweight prepreg that can be suitably used for a grip portion of various machine tools.

[0002]

2. Description of the Related Art In recent years, prepregs made of carbon fibers and other various reinforcing fibers have been widely used in various technical fields. For example, even when manufacturing sports equipment such as golf club shafts, they are lightweight and have high mechanical strength. It is often used because it is expensive, and has achieved extremely good results.

Even in such a golf club shaft, the diameter of the shaft can be made sufficiently small in terms of mechanical strength, but the grip portion has a predetermined size from the viewpoint of ease of use. I have no choice but to say.

Therefore, conventionally, as shown in FIG.
Frequently, the grip portion of the shaft 100 made of fiber reinforced resin is often wrapped with leather or fitted with a molded synthetic rubber 102 or the like until it has a predetermined outer diameter.

[0005]

However, in the structure of the grip portion according to such a conventional method, the specific gravity of leather or synthetic rubber is larger than that of the fiber reinforced resin of the shaft portion, and thus it is inevitable. It will increase the weight of the product,
Not preferable. Further, further improvement is demanded for the feel (hit feeling) of the grip portion during use, or for the impact absorption which is evaluated as the hit feeling of the grip portion in the case of a hammer or the like.

As a result of many researches and experiments, the inventor of the present invention constructs the grip portion or the grip portion with a lightweight prepreg in which a fiber-reinforced composite resin layer is laminated on a flexible sheet-like cork material. In particular, it is possible to form a grip portion having a desired diameter with a minimum increase in weight, and the grip portion or grip portion made of this lightweight prepreg has a feeling during use, that is, shock absorption. It was found that it has excellent properties.

The present invention was made based on the novel findings of the present inventor.

Therefore, it is an object of the present invention to form a grip portion or a grip portion having a desired diameter while suppressing an increase in weight to a minimum, and further, it is excellent in shock absorbing property and has a feeling in use. It is to provide a lightweight prepreg that is good.

[0009]

The above object is accomplished by a lightweight prepreg according to the present invention. In summary, the present invention is characterized by having a flexible sheet-like cork material coated with resin on both surfaces and a fiber-reinforced composite resin layer laminated on at least one surface of the sheet-like cork material. It is a prepreg.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a lightweight prepreg according to the present invention will be described in more detail with reference to the drawings.

The lightweight prepreg 1 of the present invention is shown in FIG.
As shown in the figure, it has a flexible sheet-shaped cork material 2 and a fiber-reinforced composite resin layer 4 laminated on at least one surface of the sheet-shaped cork material 2. At this time, in order to improve the adhesiveness between the sheet-shaped cork material 2 and the fiber-reinforced composite resin layer 4, the fiber-reinforced composite resin layer 4 of the sheet-shaped cork material 2 is improved.
The resin 6 is applied to the joint surface with. The resin 6 is similarly applied to the other surface of the sheet-like cork material 2 in order to improve the bondability when the lightweight prepreg 1 is attached to another member. The resin 6 applied to both sides of the sheet-shaped cork material 2 is preferably the same as the matrix resin used for the fiber-reinforced composite resin layer 4, which will be described later in detail. Further, in this lightweight prepreg 1, the other surface of the sheet-shaped cork material 2 is supported by a base material 10 such as release paper for storage management, while the surface of the fiber-reinforced composite resin layer 4 is It is covered with a cover film 12 such as a polyethylene film.

To explain further, the flexible sheet-like cork material 2 may be any available one, but generally, the thickness (T) is 0.2 to 2 mm. Let's see That is, if it is 0.2 mm or less, flexibility increases, but a problem occurs in terms of shock absorption, and 2 mm
If it exceeds, problems will occur in terms of flexibility. As the flexible sheet-shaped cork material 2, for example, cork sheet (trade name, G-40, GS, GC, G manufactured by Nagayanagi Industry Co., Ltd.)
D, GF, F-100) are preferably used. The characteristics of this cork sheet are shown in Table 1.

[0013]

[Table 1]

The coating amount of the resin 6 applied to both sides of the sheet-shaped cork material 2 is usually 18 to 60 g / m ^{2 although} it depends on the characteristics of the sheet-shaped cork material 2, and the coating layer thickness is roughly the same. Is about 15 to 50 μm.

Next, the fiber-reinforced composite resin layer 4 will be described. In the present invention, the fiber-reinforced composite resin layer 4 can have a conventional structure and is composed of arbitrary reinforcing fibers and a matrix resin. be able to.

The reinforcing fibers include inorganic fibers such as carbon fibers, boron fibers, glass fibers, alumina fibers, silicon carbide fibers and silicon nitride fibers; organic fibers such as aramid fibers, polyarylate fibers and polyethylene fibers; or titanium fibers. Amorphous fibers, metal fibers such as stainless steel fibers, etc. may be used alone or in combination in a hybrid form. The reinforcing fibers may also be used as unidirectional fibers, or in a cloth, and even in the form of mats.

As the matrix resin, epoxy resin,
A thermosetting matrix resin such as unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, or phenol resin can be used. Moreover, the curing temperature is 50
A curing agent and other imparting agents, for example, a flexibility imparting agent and the like are appropriately added so that the temperature is from about 200 ° C.

As a preferred example, an epoxy resin is preferable as the matrix resin, and examples of usable epoxy resins include (1) glycidyl ether type epoxy resins (bisphenol A, F, S type epoxy resin, novolac type epoxy resin). Resin, brominated bisphenol A epoxy resin); (2) cycloaliphatic epoxy resin;
(3) Glycidyl ester-based epoxy resin; (4) Glycidylamine-based epoxy resin; (5) Heterocyclic epoxy resin; and one or more kinds selected from other various epoxy resins, particularly bisphenol A, F, S
Glycidyl amine epoxy resin is preferably used.
As the curing agent, an amine-based curing agent such as dicyandiamide (DICY) or diaminophenyl sulfone (D
DS), diaminodiphenylmethane (DDM); acid anhydride systems such as hexahydrophthalic anhydride (HHPA),
Methylhexahydrophthalic anhydride (MHHPA) or the like is used, but an amine-based curing agent is particularly preferably used.

Further, the compounding ratio of the reinforcing fiber and the matrix resin in the fiber-reinforced composite resin layer 4 of the present invention can be adjusted arbitrarily, but generally, in weight%, the reinforcing fiber: matrix resin = (40-80) :( 60-20).
The thickness (t) of the fiber-reinforced composite resin layer 4 can be made to be about the fiber diameter of the reinforcing fiber used, but usually 60
It will be about 300 μm.

The lightweight prepreg 1 having such a structure can be manufactured by any method, but generally, as the fiber reinforced composite resin layer 4, a prepreg is manufactured by impregnating reinforcing fibers with a matrix resin, and then, the prepreg is manufactured. One side surface of the flexible sheet-shaped cork material 2 having the same resin 6 as the matrix resin of the fiber-reinforced composite resin layer 4 applied to both sides by pressing it with, for example, a roller. It is preferably manufactured.

In the above-mentioned embodiment, the lightweight prepreg 1 of the present invention has been described on the assumption that the fiber-reinforced composite resin layer 4 is attached to one surface of the flexible sheet-like cork material 2, but as shown in FIG. In addition, the fiber-reinforced composite resin layer 4 may be formed by adhering both sides of the flexible sheet-shaped cork material 2 via the resin 6 as an adhesive.

Next, an example of the lightweight prepreg 1 of the present invention will be described.

Example 1 A lightweight prepreg having the structure shown in FIG. 1 was produced. That is, the flexible sheet-shaped cork material 2 has a thickness (T) of 0.8.
A cork sheet (trade name "GC") manufactured by Nagayanagi Kogyo Co., Ltd. having a thickness of mm was used, and the epoxy resin 6 containing a curing agent was uniformly applied to both surfaces thereof at 40 g / m ² .

In the present embodiment, as the fiber-reinforced composite resin layer 4, a reinforcing fiber made of a PAN-based carbon fiber (manufactured by Toray Industries, Inc .: trade name "T-300") having a fiber diameter of 7.0 μm. A carbon fiber reinforced prepreg was prepared by arranging in one direction and impregnating the reinforcing fibers with the same matrix resin made of an epoxy resin containing a curing agent as that used as the resin 6 of the flexible sheet-shaped cork material 2. .. The matrix resin content was 35% by weight and the thickness (t) was 75 μm.

This carbon fiber reinforced prepreg 4 is pressed by a roller and attached to one surface of the resin-coated sheet-like cork material 2 held on the release paper 10 to prepare the lightweight prepreg 1 of the present invention. did.

Next, as shown in FIG. 3, the lightweight prepreg 1 is made of a cured fiber-reinforced composite resin and has an outer diameter of 1.
Two sheets were overlapped and wound around the grip portion of the golf club shaft 100 having a length of 5 mm, and then a polyethylene tape was wound around the grip portion and tightened, and then cured in a curing furnace.
The outer diameter of the grip at this time was 16.75 mm.

Further, thin leather was wrapped around the cured grip portion as a slip stopper to complete the grip portion.

The grip portion of the golf club shaft manufactured by using the lightweight prepreg 1 according to the present invention has less increase in weight as compared with the conventional one, has a good feel during use, and has a good shock absorbing property. Do you get it.

[0029]

As described above, since the lightweight prepreg according to the present invention has the flexible sheet-like cork material, the weight thereof is suppressed to the minimum, and the grip portion or the grip portion of various products is obtained. It has the features that the diameter of the grip can be increased, the shock absorption is excellent, and the feeling during use is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of an embodiment of a lightweight prepreg according to the present invention.

FIG. 2 is a cross-sectional configuration diagram of another embodiment of the lightweight prepreg according to the present invention.

FIG. 3 is a cross-sectional configuration diagram of a grip portion of a golf club shaft using the lightweight prepreg according to the present invention.

FIG. 4 is a cross-sectional configuration diagram of a grip portion of a conventional golf club shaft.

[Explanation of symbols]

 1 Lightweight prepreg 2 Flexible sheet cork material 4 Fiber reinforced composite resin layer 6 Resin layer

Claims (1)

[Claims] 1. A lightweight prepreg comprising: a flexible sheet-like cork material having both surfaces coated with a resin; and a fiber-reinforced composite resin layer laminated on at least one surface of the sheet-like cork material.