JPS61153611A - Flexible tensile wire - Google Patents

Abstract

PURPOSE:To provide a titled wire which has adequate flexibility, is reduced in weight and is improved in tensile strength by forming the wire of a wire- shaped composite structure which consists of PE fibers having specific tensile strength and tensile modulus as a reinforcing material and a thermosetting resin as a matrix material and has specific bending modulus. CONSTITUTION:The PE fibers (A) has the tensile strength of at least 20g/denier, more preferably >=30g/denier and more particularly preferably >=40g/denier and the tensile modulus of at least 500g/denier, more preferably >=800g/denier and more particularly preferably >=1,000g/denier. The thermosetting resin (B) is an unsatd. polyester resin, vinyl ester resin, epoxy resin, phenolic resin, etc. which are used alone or the compd. of >=2 kinds. The bending modulus of the wire-shaped composite body constituted of (A) and (B) is 300-1,500kg/mm<2>, more preferably 500-1,000kg/mm<2>, the tensile break strength thereof is at least 40kg/mm<2>, more preferably >=60kg/mm<2> and the fiber content (Vf) thereof is 15-60%, more preferably 20-50%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tensile strength wire that is highly strong, highly elastic, lightweight, and has four properties.

More details on tensile strength for optical fibers! ! The present invention relates to a tensile strength wire that is light and has appropriate flexibility and is suitable for a (hereinafter, the tensile strength wire is also referred to as a tension member), other tensile strength materials used in the industrial field, ropes, and cables.

(Prior art) Tension members for optical fibers are required to have particularly high tensile strength and high tensile modulus, and most of them have conventionally been made of metal wires such as steel wires.
In the case of F;I, because of its high density, it has disadvantages in terms of weight and lightness, and also has problems such as lightning strikes and electromagnetic induction interference. In order to overcome these drawbacks, metal wires have recently been replaced with high-strength, high-elastic fibers such as glass fiber or aromatic polyamide fiber (trade name: Kevlar), with fibers as reinforcement and thermosetting resin as matrix. A method of using a tear John member made of a filament composite, so-called FRP, as a tension member for an optical fiber cable has been proposed, and has already been put into practical use in some industries.

(Problem to be solved by the invention) High strength and high modulus of elasticity are the general characteristics required for tension members for optical fibers, but tension members for optical fiber cords or small capacity optical fiber cables In addition, appropriate flexibility and lightness are required.

However, the tension members conventionally used in this field, namely FRP tension members made of glass fiber or aromatic polyamide fiber as reinforcement and thermosetting resin, such as unsaturated polyester resin, as a matrix,
Although it is lighter than metal wire, it is still not sufficient, and there is a problem in that it does not have the so-called appropriate flexibility, which is high bending elastic modulus and small bending strain at break.

In the case of tear-jong members for optical fiber backbone cables, the bending distortion is essentially small considering the required performance, so there is no particular problem. In the case of 7 members, a large bending strain is easily applied, and the optical fiber cannot resist the bending strain, resulting in bending breakage, which tends to cause decisive damage to the optical fiber.

- On the other hand, in order to increase the amount of bending fracture strain, it is possible to consider making the tear John member thinner, but there is a limit to making the diameter smaller as the tensile strength will decrease and it will be difficult to titrate the basic properties of a tear John member. There is.

On the other hand, if the bending modulus is extremely low, even if the tensile strength is titrated, even a small external bending force will cause a large bending strain, easily causing bending breakage of the optical fiber itself. Therefore, for example, tear-jon members for optical fiber cords or small-capacity optical fiber cables are required not only to have high tensile strength, but also to have an appropriate bending modulus.

(Means for Solving the Problems) Means for solving the above problems, that is, the present invention provides a tensile strength of at least 20 g/denier and a tensile strength of at least 50 g/denier.
A linear composite structure using polyethylene fiber (A) having a tensile modulus of 0 g/denier as a reinforcing material and a thermosetting resin (B) as a matrix material, and having a flexural modulus of 3
00 to 1,500 kg/am''.

The polyethylene fiber (A) used in the present invention has at least 2
Tensile strength of 0 g/denier, preferably 30 g/denier or more, especially 40 g/denier or more and at least 500 g/denier
/denier, preferably 800g/denier or more,
In particular, it has a tensile modulus of 1,000 g/denier or more, where the tensile strength is less than 20 g/denier,
Alternatively, if the tensile modulus is 500 g/denier, the tensile strength and tensile modulus will be poor when made into a linear composite, resulting in the high strength, high modulus, and flexibility that are the objectives of the present invention. It becomes impossible to achieve a linear composite with .

The polyethylene fiber used in the present invention may be any fiber as long as it satisfies the above-mentioned structural requirements, but in particular, high molecular weight polyethylene with a viscosity average molecular weight of ff15 x 10' or more is preferable in terms of price and ease of spinning. It's advantageous.

The single yarn denier of the polyethylene fiber used in the present invention is not particularly limited, but is preferably 0.2 to 20 d, more preferably 0.5 to 10 d.

It has been found that, as a means of improving the adhesiveness with the thermosetting resin (I3), the adhesiveness is significantly improved by providing countless vertically long grooves on the tdAK surface.

These multi-row grooves can be provided by controlling the amount of solvent evaporated when drawing a polyethylene gel thread containing an appropriate amount of solvent. Furthermore, as a means of improving bone attachment properties, the fiber surface may be treated with fluorine gas or the epoxy base may be surface-treated with polyolefin, carbo/acid base-plated polyolefin, chlorinated polyolefin, etc. before bonding with a polymer compound. This is particularly preferred since the adhesiveness is greatly improved.

The multi-row grooves referred to herein are innumerable multi-row grooves arranged in the fiber axis direction, and the multi-row grooves include 2 or more, especially 5 to 5 per average distance FJIIOμ in the outer circumferential direction of the cross section of the fiber. 50
By arranging them, the above-mentioned effect becomes remarkable.

The thermosetting resin (I3) used in the present invention may be an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, a phenol resin, etc., used alone or in combination of two or more.

The linear composite composed of (A) and (B) has a flexural modulus of 300 to 1,500 kg/kg, preferably 50
0~1,000kg/■,! and has a tensile strength at break of at least 40 kg/ms”, preferably 60 kg/ms”.
ova" or more, and preferably has a fiber content (Vf) of 15 to 60%, preferably 20 to 50%.

Here, if the bending elastic modulus of the linear composite composed of (A) and CB) exceeds 1.500 kg/ms, bending breakage will occur when a large external bending force is applied, so it is preferable. On the other hand, if it is less than 300 kg/-3, it is not preferable because the required performance as a tensile strength wire, which is the object of the present invention, cannot be fully met.

The flexible tensile strength wire of the present invention can be manufactured, for example, as follows.

After completely dissolving high molecular weight polyethylene (for example, ultra-high molecular weight polyethylene with a viscosity average molecule b1. of lXl0' or more, preferably iX10'' or more) in a solvent such as decal/xylene or paraffin at a temperature below the boiling point of the solvent, The polyethylene 18 liquid is extruded in the spinning device at a temperature at which it does not solidify, either in the air at room temperature, in water, or into a hollow tube equipped with a cooling device.

The thread obtained by extrusion contains a solvent inside, but
The yarn is heated to such an extent that the contained solvent is extracted or not dissolved without being extracted, and the yarn is stretched in one stage or in multiple stages so that the total stretching ratio is 10 times or more, preferably 20 times or more.

A plurality of the thus obtained drawn fibers are aligned, passed through a thermosetting resin liquid bath, impregnated, and then passed through a shaping die having an arbitrary cross-sectional shape to form a cross-sectional shape. The flexible tensile strength wire of the present invention can then be obtained by curing it in a heating oven. Of course, it is not limited to this method.

(Example) The method of measuring physical properties used for evaluation of the present invention is as follows.

Measuring method of strength and elongation properties> JIS L-1013 (1
981).

5-sIflIta was measured using a Tensilon manufactured by Toyo Baldwin Co., Ltd. under the conditions of a sample length (gauge length) of 200-■/min and a tensile rate of 100-■/min, and the tensile strength at break and tensile modulus were calculated. The tensile modulus was calculated from the maximum slope near the origin of the S-3 curve.

Measuring method of flexural modulus> JIS-6911 (19
79).

Uses Tensilon made by Toyo Baldwin I,) Three-point support P
The bending S-8 curve was measured using the t method at a deformation rate of 1 k/min, and the initial bending modulus was calculated using the following formula. ) δ: Bending deformation ff1 (-1) D: Sample diameter (-) Amount of deformation at bending break> Amount of deformation at bending break δ (關) in measuring bending elastic modulus
It was displayed in

Experiments positive 1 to 4 Ultra-high molecular weight polyethylene having a flexible polymer chain with a viscosity average molecular weight of I x 10 @ to 1.8 x 10 @ is dissolved in Decali/ to prepare a spinning stock solution, and then the spinning stock solution is spun. Inside the device, the polyethylene solution is extruded from a spinneret into the atmosphere at room temperature at a temperature at which it does not solidify, and is cooled to form a gel-like fiber. Without extracting and drying the gelatinous fibers containing decalin, the gelatinous fibers were stretched at various temperatures and stretching ratios at a temperature at which the gelatinous fibers did not melt. A multifilament having the properties shown in Table 4 was obtained.Using each multifilament, the number of strands shown in Table 1 was drawn without twisting to form a strand, and the resin solution shown in Table 1 was prepared. After impregnating into a resin liquid bath adjusted at the mixing ratio, passing through a 2mm diameter shaping die, and heat curing under the respective curing conditions shown in Table 1,
Linear composites with various properties were obtained.

Table 1 shows the properties of each linear composite.

Experiment Na5 20 multifilaments used in Experimental Point 3 were arranged to form a strand with a total of 20,000 denier, and passed through a shaping die of 2 mm diameter under the conditions shown in Table 1 to form a linear composite. was molded. Table 1 shows the properties of the obtained linear composite.

Experimental point 6 Commercially available aromatic polyamide fiber (trade name Kevlar 49)
1,400 denier/1,000 filament, 1
Two untwisted strands were pulled together to form a total of 17.040 denier strands under conditions not shown in Table 1. A linear composite was formed by passing through a shaping die of 11φ. Table 1 shows the properties of the obtained linear composite.

Experiment N11L7 14 commercially available glass fibers (equivalent to 890 denier) were arranged to form a strand with a total of 12,460 denier.
Under the conditions shown in the table, a linear composite was molded by passing through a shaping die of 1.6 s + ■φ. Table 1 shows the properties of the obtained linear composite.

As is clear from Table 1 below, the linear composites (experiments NcL1 to 3) using polyethylene fibers specified in the present invention all have a tensile strength of 40 kg/w++" or more and a preferable flexural modulus of 500 to 1. ,000 kg/work', and no bending breakage occurred in any of the bending modulus measurements.

The tensile strength and tensile modulus of the fibers are less than the values specified by the present invention (actual device 4), and the tensile elasticity of the linear composite is lower than that of the present invention (actual device 1), which has almost the same fiber content. The elastic modulus and flexural modulus are significantly inferior. That is, the tensile strength is 40k
g/■lI2 or less, flexural modulus is 300kg/s
m'' or less, both of which are outside the values specified by the present invention and are unfavorable in terms of the properties of the tension member.
/■■2) In all comparative examples (actual devices 5 to 7), bending fracture occurred when measuring the bending elastic modulus.

In the comparative example (actual device 5), the tensile strength of the linear composite is higher than that of the present invention (experiments 1 to 3), but the bending modulus is high (bending breakage occurs easily, so the flexibility is low). So it's not desirable.

In addition, in both comparative examples (experiment Na 6.7), even though the tensile strength of the linear composites is almost the same as in the present invention (experiments Na 2, 3), the bending elastic modulus is higher, and when measuring the bending elastic modulus, Bending fracture occurred. In particular, in the comparative example (actual device 7), bending fracture occurred even though the diameter of the linear composite was made smaller than that of the present invention (experiments Na 1 to 3).

Also, when comparing the specific strength of the linear composite, it is found that the present invention (experimental Na
2, 3) are significantly higher than those of the comparative example (actual device 4, 6.7). This shows that diameter reduction can be carried out much more advantageously than in the comparative example.

From the above results, the linear composite of the present invention has a
i! It has extremely high flexibility, is lightweight, and has high tensile strength, so it has particularly excellent properties as a tension member for optical fiber bar codes or small capacity optical fiber cables. Recognize.

(Effects of the Invention) As seen in the above examples, the flexible tensile strength wire of the present invention has excellent flexibility compared to the conventionally known FRI' length/length/john members. The flexibility of the present invention is superior to conventional tension members in that it does not cause bending fractures in the tension members even when a large external bending force is applied. When tension control wires are used as tension members for optical fiber barcodes and small-capacity optical fiber cables, they do not damage the optical fiber cores, so high-quality optical fiber barcodes and small-capacity optical fiber cables can be obtained. It will be done.

The small capacity optical fiber cable mentioned here is, for example,
A low-capacity optical fiber cable used for subscriber systems, offices, in-plant and mobile optical communication systems, etc.

In addition, the flexible tensile strength wire of the present invention is a tensile strength wire that can be widely used as a tensile strength material in all industrial fields that require all performances such as high strength, high elastic modulus, light weight, and excellent fuability. Comes as a gland.

Claims (4)

[Claims] (1) A linear composite structure in which polyethylene fiber (A) having a tensile strength of at least 20 g/denier and a tensile modulus of at least 500 g/denier is used as a reinforcing material, and a thermosetting resin (B) is used as a matrix material. A flexible tensile strength wire having a bending modulus of 300 to 1,500 kg/mm^2. (2) The tensile strength of the linear composite structure is at least 40k
The flexible tensile strength wire according to claim 1, which is g/mm^2. (3) The flexible tensile strength wire according to any one of claims 1 to 2, wherein the polyethylene fiber (A) is made of ultra-high molecular weight polyethylene having a viscosity average molecular weight of 500,000 or more. (4) The flexible tensile strength wire according to any one of claims 1 to 3, wherein the polyethylene fiber (A) has numerous vertically elongated grooves on its surface.