JPH05148780A - Production of rope composed of fiber-reinforced composite material - Google Patents

Abstract

PURPOSE:To obtain the subject lightweight product, having corrosion resistance, good in operating efficiency and suitable for building materials or civil engineering by impregnating fiber bundles with an epoxy resin in a specific proportion, semicuring the resin, twisting the resultant fiber-reinforced composite element wires and then thermosetting the resin. CONSTITUTION:Fiber bundles (generally fiber bundles of carbon fiber, aramid fiber or glass fiber) are initially impregnated with an epoxy resin so as to provide 40-70wt.% fiber content and then preferably semicured by a method for treatment at 80-120 deg.C for 1-5min. The resultant plural fiber-reinforced composite element wires having 1-5 mm diameter are subsequently twisted to afford a fiber-reinforced composite material, which is then heat-treated preferably at 150-180 deg.C for 2-5min and cured to provide the objective product. Furthermore, the diameter of the product is preferably 3-50mm from the viewpoint of use as a substitute wire rope in applications of civil engineering and construction. The number of twists of the rope is preferably 1-10 turns/m in aspects of shape retaining properties, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rope made of fiber reinforced composite material. More specifically, the present invention relates to a method for manufacturing a rope made of a fiber-reinforced resin composite material that is lightweight and has good shape retention and workability for building materials and civil engineering applications.

[0002]

2. Description of the Related Art Conventionally, a large amount of wire rope has been used as a high strength and low elongation rope for building materials and civil engineering applications. It 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, the rope made by twisting steel wires is heavy due to the large specific gravity of iron,
Problems such as the use of sea sand and corrosion that occur during waterfront development have been raised.

At the construction / civil engineering site, in order to easily transport a long rope, it is required that the rope can be wound and bent. On the other hand, in the composite material, in order to maximize the reinforcing effect of the fibers, it is necessary to use a matrix resin having a glass transition point that is high to some extent,
Composite ropes are less likely to wind or bend. In Japanese Examined Patent Publication No. 62-18679, in order to solve these problems, a high strength and low elongation fiber bundle of carbon fiber, glass fiber, aramid fiber, etc. is impregnated with a thermosetting resin and then sprinkled with a powder agent. In order to prevent the resin from leaking out, a method has been proposed in which a carbon fiber bundle obtained by wrapping with a braid made of synthetic fibers and semi-cured is twisted and completely cured to obtain a stranded wire.

[0004]

However, the above Japanese Patent Publication No. 6
When a complicated process such as No. 2-18679 is adopted, the work process becomes complicated, the processing cost is high, and
It has been difficult to provide a rope made of a composite material that is lightweight, has good shape-retaining properties and good workability for civil engineering applications.

That is, an object of the present invention is to provide a rope made of a composite material which is lightweight and has good shape-retaining property and workability for building materials and civil engineering applications.

[0006]

In order to solve the above-mentioned problems, the method for manufacturing a rope made of the fiber-reinforced composite material of the present invention has the following constitution. That is, the fiber content rate is 4 in the fiber bundle.
Impregnated with epoxy resin at 0 ~ 70wt%, semi-cured,
Production of a rope made of a fiber-reinforced composite material, characterized in that a plurality of fiber-reinforced composite wires having a diameter of 1 to 5 mm are twisted together to form a fiber-reinforced composite material, and the fiber-reinforced composite material is cured by heat treatment. Is the way.

The present invention will be described in detail below. In the present invention, the fiber bundle refers to a bundle of reinforcing fibers of the fiber-reinforced composite material, as the type of the fiber, high strength, less creep, chemically stable fibers are preferred, generally,
Carbon fiber, aramid fiber, and glass fiber are used.

An epoxy resin is used as a matrix resin in the method for producing a rope made of the fiber-reinforced composite material of the present invention. When a fiber other than epoxy resin is used as a reinforcing material, the reinforcing effect is not sufficient, and there is a problem that the adhesive strength between the resin and concrete is poor.

The fiber content of the fiber-reinforced composite wire is 40 to 7
It is set to 0 wt%. If the fiber content is less than 40 wt%, the strength per cross-sectional area will be reduced and the cost will be disadvantageous. On the other hand, if the fiber content exceeds 70 wt%, uniform impregnation becomes difficult.

The fiber-reinforced composite wire has a diameter of 1 to 5 mm. If the diameter exceeds 5 mm, it becomes difficult to uniformly impregnate the epoxy resin, and it becomes difficult to wind up the cured rope. On the other hand, if it is less than 1 mm, the twisting process becomes complicated.

The diameter of the finally obtained rope made of the fiber-reinforced composite material is 3 to 5 from the viewpoint of using it as a substitute for the wire rope in civil engineering and construction applications.
The range of 0 mm is preferable. In addition, from the viewpoint that the shape retention is good and the rope is easily wound up, while the fiber does not deviate from the pulling direction and the strength of the rope does not decrease, the number of twists of the rope is 1 ~ 10 turns /
A range of m is preferred.

In the method for producing a rope made of the fiber-reinforced composite material of the present invention, the epoxy resin is impregnated and then semi-cured. In the present invention, the semi-curing is usually performed at a glass transition point of the epoxy resin after impregnation of 0 to 40 ° C.
It can be performed by setting the range of. If it is not semi-cured, the fiber-reinforced composite strands wound on the bobbin will be fused to each other and will be difficult to release. On the other hand, if the curing is too advanced, it will not be able to bend or wind. The condition of this semi-curing treatment is a temperature of 80 to 80 from the viewpoint of easily setting the glass transition point of the epoxy resin after impregnation to the range of 0 to 40 ° C.
120 ° C. and a treatment time of 1 to 5 minutes are preferable.

In the method of the present invention, a plurality of fiber-reinforced composite strands thus semi-cured are aligned and twisted, and then heat-treated to cure. In the present invention, the curing usually takes the glass transition point of the epoxy resin to 8
It can be carried out within the range of 0 to 150 ° C.
If the glass transition point after curing is less than 80 ° C, the ambient temperature may exceed the glass transition point after curing depending on the weather conditions, and it becomes impossible to maintain the shape of the rope. On the other hand, when the glass transition point after curing exceeds 150 ° C., the rope becomes rigid and winding becomes difficult. In addition, it is preferable to set the glass transition point after curing to 80 to 100 ° C. from the viewpoint that it is possible to further reduce the curvature during bending by heating the glass transition point or higher during the construction.

The heat treatment conditions for curing are:
Conditions for completing the curing of the impregnated epoxy resin, specifically, 150 to 180 ° C. and 2 to 5 minutes are preferable. As the heat treatment means, there are a hot air method and a die method.

The methods for measuring the breaking strength and elastic modulus of ropes applied in the following examples are as follows. Length 200 with a wall thickness of 5 mm, which is 10 mm larger than the outer diameter of the rope
Length is 1000 mm with carbon steel pipe threaded on both sides of mm
Both ends of the mm rope were fixed with expansion cement (Bryster 100) manufactured by Onoda Cement Co., Ltd. The breaking strength was measured with a tensile tester (50 ton Instron) using an external screw. At the same time, a strain gauge was attached to the rope, the displacement was measured, and the elastic coefficient was measured.

[0016]

EXAMPLES The present invention will be described in more detail below with reference to examples. (Examples 1 to 3 and Comparative Examples 1 to 4) Carbon fiber "Torayca" (registered trademark) T300-12K manufactured by Toray Industries, Inc. was changed in the number of untwisted yarns and aligned. It was led to the impregnation device shown and impregnated with epoxy resin. The epoxy resin composition is EP-827: 50 manufactured by Yuka Shell Epoxy Co., Ltd.
Parts, Ciba Geigy XB-4122: 50 parts, ethylmethylimidazole: 2 parts. The diameter of the die is 2.5 mm, the excess resin is removed, and the fiber content is 4
It was adjusted to be 0 to 70 wt%. 100 with a die
The epoxy resin was semi-cured by heating at 3 ° C for 3 minutes, and its glass transition point was 30 ° C.

The semi-cured diameter 2.5 thus obtained
mm fiber-reinforced composite strands were twisted to form a fiber-reinforced composite material, which was heat-treated at a temperature of 160 ° C. for 2 minutes to be cured.
The glass transition point of the impregnated epoxy resin after curing was 120 ° C. The cross section of the wire was polished and observed with a microscope to confirm the presence or absence of cavities. The strength of the filament-shaped fiber composite material was also measured. The results are shown in Table 1. Experiment number 1-4
1-5, 1-6 are Examples 1, 2, 3 respectively, and experiment numbers 1-1, 1-2, 1-3, 1-7 are Comparative Examples 1, 2, 3, 4 respectively.

[0018]

[Table 1]

(Examples 4 to 8) Strand-shaped fibers obtained under exactly the same conditions as Level 1-5 of Example 1 except that the heat treatment condition for semi-curing was changed to 100 ° C. for 2 minutes. After arranging and twisting the composite material strands by changing the number of strands of 2 turns / m, the strands were heat-treated at 150 ° C. for 3 minutes to be cured to form a rope and wound on a drum having a diameter of 1 m. Winding up was easy. This rope was inserted into carbon steel having an inner diameter 20 mm larger than the outer diameter and a thickness of 5 mm and a length of 200 mm, and an appropriate amount of water was added to the expanded cement made by Onoda Co., Ltd., and cured at room temperature for 2 days. .. The breaking strength was measured with an Instron with a capacity of 50 tons. The measurement results are summarized in Table 2. Experiment numbers 2-1, 2-2, 2-3, 2-
4, 2-5 are Examples 4, 5, 6, 7, and 8, respectively. It can be seen that the smaller the diameter of the rope, the higher the breaking strength and the higher the strength utilization factor of the wire base.

[0020]

[Table 2]

[0021]

According to the method of the present invention, there is corrosion resistance,
It is possible to provide a stable rope made of a fiber-reinforced composite material which is lightweight and has good workability and which is suitable for building materials and civil engineering applications. Further, the obtained rope can be easily bent by heating. According to the method of the present invention, since the resin does not leak from the wire after impregnation and curing, it is not necessary to wrap the wire with a braid, and the working process can be simplified.

[Brief description of drawings]

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

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A fiber bundle is impregnated with an epoxy resin at a fiber content of 40 to 70 wt%, semi-cured, and a plurality of fiber-reinforced composite wires having a diameter of 1 to 5 mm are twisted together to form a fiber-reinforced composite material. A method for producing a rope made of a fiber-reinforced composite material, which comprises curing the fiber-reinforced composite material by heat treatment.