JPH0547234A - Heat-resisting, bending-resisting, and wear-resisting insulated cable - Google Patents

Abstract

PURPOSE:To improve the heat resistance, bending resistance, and wear resistance of an insulated cable (p). CONSTITUTION:A flexible conductor (a) is formed of a copper alloy excellent in bending resistance and never inferior in conductivity, compared with pure copper, which contains 0.02-3wt.% of at least one of Fe and Mg, 0.006-1wt.% of at least one of P and B, 0.01-0.5wt.% of In, and the remainder substantially consisting of copper. A sheath (b) is formed of a mixture obtained by kneading a polyether or polycarbonate polyurethane elastomer and a fluorine-contained elastomer based on polyvinylidene fluoride within the range of 30/70 to 90/10 by weight, and adding 1-9 PER of a cross-linking agent thereto. The weight ratio is preferably 30/70 to 70/30, and the cross-linking agent is added in 3-7 PHR.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire having bending and abrasion resistance under a high temperature environment.

[0002]

[Technical background] Control wires for elevators and cranes
Cables, electric wires / cables for electric power supply, electric wires / cables for robots (hereinafter simply referred to as electric wires), etc. are required to have bending resistance and abrasion resistance depending on the usage conditions. When this electric wire is used in a high temperature environment, heat resistance is required in addition to the above-mentioned characteristics.

Many of these properties are owed to the resin mixture forming the outer cover, but usually, most of the resin mixtures utilize the properties of the base polymer while complementing other properties. Various substances are added to. Most of these additives improve the properties of one of them, but most of them give the effect of reducing the properties of the other. Therefore, under such circumstances, it is difficult to obtain an insulated electric wire with a jacket that satisfies the various required characteristics as described above.

Further, a flexible conductor is required to have high durability against repeated bending, and a pure copper conductor does not sufficiently meet the demand.

In view of the above points, an object of the present invention is to provide an insulated electric wire which is resistant to repeated bending and can be used in a high temperature environment.

[0006]

In order to solve the above-mentioned problems, in the present invention, a flexible conductor is made of the following copper alloy (I).
Or (II), and its outer coat is based on a polyether or polycarbonate polyurethane elastomer (hereinafter referred to as TPU) and a polyvinylidene fluoride (hereinafter referred to as PVDF) -based fluoroelastomer ( Hereinafter, referred to as F-TPE) and 30 by weight ratio.
Knead in the range of / 70 to 90/10, and then add the crosslinking agent 1
It was decided to form it with a mixture having a composition to which ~ 9 PHR was added.

Note [Copper alloy] (I) 0.02 to 3% by weight of at least one of Fe and Mg, 0.006 to 1% by weight of at least one of P and B
And a 0.01% to 0.5% In content, with the balance being essentially copper.

(II) Fe, Mg and P are contained, and the content of Fe: 0.02 to 3% by weight, Mg: 0.02% by weight to 3% by weight, and P: Fe content is increased. 25 against
A copper alloy whose content is 70 to 90% by weight with respect to 80% by weight + Mg content, and the balance being copper. (Japanese Patent Publication 62-122
95, Japanese Patent Publication No. 62-39214, etc.).

The weight ratio of TPU / F-TPE is preferably 30/70 to 70/30, and 3 to 7 PHR is added to the crosslinking agent. If the weight ratio is out of the above range, the advantages of TPU and F-TPE cannot be utilized, and the defects are exposed. That is, when TPU is increased, heat resistance, water resistance, and electric insulation are deteriorated. Further, when the amount of F-TPE is large, extrusion processability and mechanical properties deteriorate. On the other hand, when TPU is low, wear resistance, tensile strength and elasticity in a wide temperature range cannot be expected. F
-When TPE is low, heat resistance, chemical resistance, and surface slipperiness cannot be expected.

By the way, the insulated electric wire is twisted together with the interposition,
When the insulation core wire is made by press-wrapping and the sheath is applied on the core wire to make a cable, if the slipperiness of the above surface is reduced, the slippage between the insulation core wires will also be reduced, so that the cable itself is flexible. And flex resistance are reduced.

When the amount of the crosslinking agent is less than the above range,
It is not possible to obtain desired physical properties such as tensile strength, hardness, heat deformation resistance, and elongation. On the contrary, when the amount of the crosslinking agent is large, it becomes over-crosslinked, the hardness becomes high, the heat aging resistance and the flexibility deteriorate, and the crosslinking agent blooms to deteriorate the appearance.

The TPU shown in Table 1 is F
Examples of -TPE include those shown in Table 2.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

In the insulated wire of the present invention constructed as described above, first, the copper alloy having the above-mentioned composition I or II forming the flexible conductor is bent as described in JP-B-62-1295. Excellent in conductivity and comparable to pure copper. For example, in fatigue characteristics, bending strain of 0.3
Under the condition of 06%, the number of bending and bending of the copper alloy wire is about 1
Compared to 610,000 times, that of pure copper wire is about 43,000 times and about 4 times.
Under the condition that the bending strain is 0.22%, the copper alloy wire: 31.5 million times or more, the pure copper wire: about 1193,000 times and about 260 times or less, the bending strain is 0.18%. Under the conditions, the copper alloy wire is 62 million times or more, and the pure copper wire is about 218,000 times, which is about 1/280 or less.

In addition, the outer cover keeps abrasion resistance at the TPU portion and bend resistance and heat resistance at the F-TPE portion,
Within the above specific compounding range, the properties of heat resistance, bending resistance and wear resistance are maintained.

[0017]

EXAMPLES Next, examples of the present invention will be described. First, as shown in Table 3, the admixtures of Examples 1 to 4 were kneaded and adjusted. The kneading is performed with a Blanbender mixer, and the kneading temperature is 180 ° C. for 3 to 5 minutes. First TPU
And F-TPE were added in the required amounts and kneaded for 3 minutes, then the required amount of cross-linking agent was added, and the mixture was kneaded and adjusted at a temperature of 150 ° C. for 2 minutes.

[0018]

[Table 3]

200 of the mixture b prepared as described above
A 1 mm thick crosslinked sheet was formed by a heating press at 100 ° C. and 100 kgf / cm ² , and the sheet was crosslinked by irradiation with an electron beam at 15 Mrad to prepare a sample. With this sample, JIS K6723
Based on the above, a tensile test sample (heat aging test sample) and an electrical characteristic test sample were prepared, and the results of the respective tests are shown in FIGS. 2 and 3. In the figure, El indicates elongation and Ts indicates tensile strength.

Next, the above-prepared mixture b was extruded with an extruder to a thickness of 0.3 mm on a 7/36 / 0.05 mm aggregate stranded wire a made of the copper alloy having the composition (I). The insulated wire p shown in FIG. 1 was obtained by extrusion molding (a part of the wire is omitted in the figure).

FIG. 4 shows the results of a wear resistance test of this insulated wire p according to JIS K7204 (using abrasive grains CS-17).

The bending resistance test was conducted by using the device shown in FIG.
Was mounted and carried out under the following conditions, and the number of reciprocations at which the wire breakage occurred was determined. In the figure, 1 is a moving guide and 2 is a fixed guide. The result is shown in FIG.

Sample a Length 15 to 16 cm Moving length of moving guide 1 50 mm Amplitude speed 60 times / min Curvature r 7 mm From the above test results, the insulated wire p according to the present invention is heat resistant,
It can be understood that the bending resistance and abrasion resistance are sufficiently satisfied.

Even if the copper alloy having the above composition (II) is used for the flexible conductor a, the same effect can be obtained.

[0025]

Since the present invention is constructed as described above,
It has excellent heat resistance, bending resistance, and wear resistance.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment.

[Fig. 2] Test result diagram

[Fig. 3] Test result diagram

[Fig. 4] Test result diagram

5A and 5B are schematic views of a bending resistance tester, in which FIG. 5A is a front view and FIG. 5B is a left side view.

FIG. 6 Test result diagram

[Explanation of symbols]

 1 Moving guide 2 Fixed guide p Insulated wire a Stranded wire (flexible conductor) b Resin mixture

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kihachi Ohnishi 2-3-1 Iwata-cho, Higashi Osaka City Tatsuta Electric Wire Co., Ltd.

Claims (4)

[Claims] 1. A heat-resistant, bend-resistant and wear-resistant insulated wire comprising a flexible conductor made of a copper alloy having the following composition coated on the outer periphery of the following mixture. Note [Copper alloy] At least one of Fe and Mg 0.02
A copper alloy containing 3% by weight, 0.006 to 1% by weight of at least one of P and B, and 0.01 to 0.5% by weight of In, and the balance substantially consisting of copper. [Admixture] A polyether or polycarbonate polyurethane elastomer and a polyvinylidene fluoride-based fluorine elastomer in a weight ratio of 30/70 to
Knead in the range of 90/10 and add cross-linking agent 1 to 9 PH
A mixture formed by adding R. 2. The heat-resistant, bend-resistant and wear-resistant insulated electric wire according to claim 1, wherein the copper alloy has the following composition. Contains Fe, Mg and P, and the content is Fe: 0.0
2-3% by weight, Mg: 0.02% by weight and more than 3% by weight
Up to 25: 80% by weight of P: Fe content + Mg
A copper alloy whose content is 70 to 90% by weight and the balance is copper. 3. The weight ratio of the admixture is 30/70 to 70 /.
30. The heat-resistant, bending-resistant and wear-resistant insulated electric wire according to claim 1 or 2, wherein 4. The heat-resistant, bending-resistant and wear-resistant insulated electric wire according to claim 1, wherein the cross-linking agent of the admixture is added in an amount of 3 to 7 PHR.