JPH0533278A - Rope comprising carbon fiber-reinforced composite material and production thereof - Google Patents

Abstract

PURPOSE:To produce the subject rope useful for building materials, construction materials and having light weight, excellent shape retainability and good workability by twisting plural carbon fiber-reinforced composite materials impregnated with a thermoplastic resin so as to specify the content of the fibers. CONSTITUTION:Plural carbon fiber-reinforced composite materials each having a diameter of 1-5mm and produced by impregnating a carbon fiber bundle with a thermoplastic resin (preferably nylon) so as to give a fiber content of 40-70wt.% are twisted and subsequently subjected to a thermal treatment [at a temperature of the melting point -(5 to 20 deg.C)] to provide the objective rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope made of carbon fiber reinforced composite material and a method for producing the rope.

[0002]

2. Description of the Related Art A large amount of wire rope has been used as a high-strength, low-extension rope for building materials and civil engineering applications. This is made by twisting steel wires with high tensile strength and low elongation. This rope has the advantage that it has less elongation than a rope made of natural fibers such as Manila hemp and sisal or synthetic fibers such as nylon and polyester when loaded.

However, ropes made by twisting steel wires have problems such as weight due to the large specific gravity of iron, corrosion caused by the use of sea sand and waterfront development.

On the other hand, Japanese Patent Publication No. 62-18679 discloses a high strength, low elongation fiber bundle such as carbon fiber, glass fiber or aramid fiber impregnated with a thermosetting resin in order to solve these problems. In order to prevent the resin from leaking after being sprinkled with the powder, a technique of wrapping it in a braid made of synthetic fibers and curing it is disclosed. Further, a method has been proposed in which the wire-like carbon fiber bundle thus obtained is twisted, wrapped with a braid, and completely cured to obtain a stranded wire made of the carbon fiber bundle.

[0005]

However, in this method, it is difficult to bend the stranded wire with a small curvature because the stranded wire is made of a thermosetting resin. It makes it easier to fix the edges. Further, since the above-mentioned method requires complicated processing steps, the processing cost is high, and it is difficult to economically match the construction material and civil engineering applications.

By solving the problems of the prior art,
It is an object of the present invention to provide a rope made of a carbon fiber reinforced composite material which is lightweight and has good shape retention and workability for civil engineering applications, and a method for producing the rope.

[0007]

The rope made of the carbon fiber reinforced composite material of the present invention has the following constitution in order to solve the above problems. That is, the fiber content is 40 to 70 wt.
1-5 mm diameter impregnated with thermoplastic resin so that
Is a carbon fiber reinforced composite material obtained by twisting a plurality of carbon fiber reinforced composite materials.

Further, the method for manufacturing a rope made of the carbon fiber reinforced composite material of the present invention has the following constitution in order to solve the above problems. That is, the carbon fiber bundle has a fiber content of 4
The impregnated carbon fiber reinforced composite material is obtained by impregnating a thermoplastic resin to 0 to 70 wt%, twisting a plurality of carbon fiber reinforced composite materials having a diameter of 1 to 5 mm, and heat-treating the carbon fiber reinforced composite material. The method for producing a rope made of a carbon fiber reinforced composite material, characterized in that the shape of the rope is retained.

The present invention will be described in detail below. The rope made of the carbon fiber reinforced composite material of the present invention uses a thermoplastic resin as a matrix resin. In the case of a thermoplastic resin, the resin does not leak from the carbon fiber bundle after the impregnation, so that it is not necessary to wrap the fiber bundle with a braid, and the processing process can be simplified. The obtained stranded wire can be easily bent by heating. Thermosetting resins do not have this advantage.

Generally, since the melt viscosity of the thermoplastic resin is higher than that of the thermosetting resin at the time of impregnation, it is difficult to uniformly impregnate the carbon fiber bundle with the resin. For example, as shown in FIG. A thermoplastic resin is discharged from the extruder 1 at a constant rate, the resin impregnation unit 2 opens the carbon fiber bundle to impregnate the resin under pressure, and the die 3 shapes the fiber bundle into a circular shape and a winding device. The carbon fiber resin-impregnated linear bundle obtained by winding in 4 is aligned, twisted, and heat-treated to fix the shape, whereby a carbon fiber-reinforced composite material can be obtained.

Since this carbon fiber reinforced composite material uses a thermoplastic resin as a matrix resin, it can be bent easily by heating it to a temperature higher than the melting temperature of the resin, and the construction at the construction site is easy.

As the thermoplastic resin applicable to the present invention,
A resin that melts at a relatively low temperature and has a low melt viscosity is preferable,
Examples include nylon, polyester, polyethylene and vinyl chloride resin. Nylon is preferred as the thermoplastic resin because of the large reinforcing effect of the carbon fibers.

The carbon fiber reinforced composite material has a fiber content of 40.
˜70 wt%. Fiber content is 40wt
If it is less than%, the strength per cross-sectional area is reduced and it is disadvantageous in terms of cost. On the other hand, if the fiber content exceeds 70 wt%, uniform impregnation becomes difficult.

The carbon fiber reinforced composite material has a diameter of 1 to 5 mm.
It is what If this diameter exceeds 5 mm, it becomes difficult to uniformly impregnate the matrix resin, and it becomes impossible to wind the carbon fiber bundle after impregnation. On the other hand, if it is less than 1 mm, the twisting process becomes complicated.

The diameter of the rope in which the carbon fiber reinforced composite materials are twisted together is preferably in the range of 3 to 50 mm from the viewpoint of using it as a substitute for the wire rope in construction and civil engineering applications. In addition, the shape retention is improved,
From the viewpoint of facilitating the winding of the rope and preventing the carbon fiber from deviating from the tensile direction and decreasing the strength of the rope, the number of rope twists is in the range of 1 to 10 turns / m. Is preferred.

In the method for manufacturing a rope made of the carbon fiber reinforced composite material of the present invention, the heating temperature for heating the carbon fiber reinforced composite material is such that the wires are fused and it becomes difficult to wind the rope. On the other hand, from the viewpoint that the repulsive force between the strands is large and the shape retention of the rope is not deteriorated, the range of 5 to 20 ° C. below the melting temperature is preferable.

Specific examples of the heat treatment include a hot air method and a die method.

A twisted wire-shaped roller applied in the following examples.
The method for measuring the strength and elastic modulus of the slab is as follows. 200m length 5mm thick 10mm larger than the outer diameter of the rope
The length is 1000m with carbon steel pipe with thread on both sides of m
Both ends of the m-shaped rope were fixed with expanded cement (Bryster 100) manufactured by Onoda Cement Co., Ltd. The breaking strength was measured with a tensile tester (50 tons-Instron) using an external screw. At the same time, a strain gauge was attached to the rope and the displacement was measured to measure the elastic modulus.

The present invention will be described in more detail below with reference to examples.

[0020]

【Example】

(Examples 1 to 3 and Comparative Examples 1 to 4) Toray Co., Ltd. carbon fiber “Torayca” T300-12K The number of untwisted yarns was changed and aligned, and led to the impregnating apparatus of FIG. 1 at a speed of 1 m / min. Nylon 6 resin was impregnated at 260 ° C. Nylon resin feed rate is 10g / min, the diameter of die is 2.5mm,
Excess resin was removed and the fiber content was adjusted to 40 to 70 wt%. The cross section of the obtained resin-impregnated carbon fiber composite material was polished and observed with a microscope to confirm the presence or absence of voids.

The results are shown in Table 1.

[0022]

[Table 1]

(Examples 4 to 8 and Comparative Example 5) Examples 1 to 3
Under the same conditions as those described above, the number of T300-12K and the diameter of the die were changed to obtain the strands having different thickness while keeping the fiber content constant. The results are shown in Table 2. When the diameter is 5 mm or less, winding is a process that can be performed to obtain a wire with few voids and high breaking strength.

[0024]

[Table 2]

(Examples 9 to 13) The carbon fiber bundles having a fiber content of 57 wt% obtained in Example 2 were aligned by changing the number of fibers and twisted at 2 turns / m, and then heat-treated at 210 ° C. Then, the rope was covered with a braid made of nylon 6 and wound on a drum having a diameter of 1 m. Winding up was easy. This rope is used to melt nylon 6 (215
It could be bent easily when heated to 240 ° C., which is higher than ˜220 ° C.).

At both ends of this rope, the inner diameter is 10 mm larger than the outer diameter of the rope, the wall thickness is 5 mm, and the length is 200 mm.
Of the carbon steel, and an appropriate amount of water was added to the expanded cement manufactured by Onoda Co., Ltd., and the mixture was cured at room temperature for 2 days. Fifty
Breaking strength was measured with an Instron with a capacity of tonnes. The measurement results are summarized in Table 3. The smaller the diameter of the rope, the higher the breaking strength and the higher the utilization factor of the wire base.

[0027]

[Table 3]

[0028]

EFFECTS OF THE INVENTION It is possible to provide a rope made of a carbon fiber reinforced composite material which is lightweight and has good shape retention and workability for building materials and civil engineering applications, and a method for producing the rope.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a method for producing a rope made of a carbon fiber reinforced composite material of the present invention.

[Explanation of symbols]

1: Extruder 2: Resin impregnation part 3: Dice 4: Winding device 5: Drive station 6: Carbon fiber

Claims (4)

[Claims] 1. A carbon fiber reinforced composite material comprising a plurality of twisted carbon fiber reinforced composite materials having a diameter of 1 to 5 mm, which are impregnated with a thermoplastic resin so as to have a fiber content of 40 to 70 wt%. Made of rope. 2. A rope made of a carbon fiber reinforced composite material according to claim 1, wherein the thermoplastic resin is nylon. 3. A carbon fiber bundle having a fiber content of 40 to 70 wt.
% To 5% by impregnation with thermoplastic resin
Of a carbon fiber reinforced composite material, characterized in that the carbon fiber reinforced composite material is twisted, and the carbon fiber reinforced composite material is heat-treated to maintain the shape of the impregnated carbon fiber reinforced composite material. Method. 4. The method for producing a rope made of a carbon fiber reinforced composite material according to claim 3, wherein the thermoplastic resin is nylon.