JPH0547230A - 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 not inferior in conductivity, compared to pure copper, which alloy contains lead and tin, tin and antimony, or lead and antimony, their total content being 0.02-0.15wt.%, each content being 0.006 wt.% or more, oxygen content being 0.001-0.005wt.%. A sheath (b) is a mixture obtained by kneading a polyether or polycarbonate polyurethane elastomer with a fluorine elastomer based on polyvinylidene fluoride within the range of 30/70-90/10 by weight, and adding 1-9 PHR 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).
To (III), and its outer coat is based on a polyether or polycarbonate polyurethane elastomer (hereinafter referred to as TPU) and polyvinylidene fluoride (hereinafter referred to as PVDF). Fluorine-based elastomer (hereinafter referred to as F-TPE)
Was kneaded in a weight ratio of 30/70 to 90/10, and the mixture was formed by adding a cross-linking agent 1 to 9 PHR thereto.

[Copper Alloy] (I) The total content of lead and tin is 0.02 to 0.15% by weight, and the content of each is 0.006% by weight or more,
A copper alloy having an oxygen content of 0.0001 to 0.005% by weight and the balance substantially of copper.

(II) A copper alloy in which the total content of tin and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper.

(III) A copper alloy in which the total content of lead and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper.

In the copper alloy of the above composition (I), the total amount of lead and tin is preferably 3.7 times or more the oxygen content, and also in the compositions of (II) and (III). The oxygen content is preferably 0.0001 to 0.005% by weight. (JP-A 61-23736, JP-A 6-6
(See JP-A 1-23737 and JP-A 61-23738).

The weight ratio of TPU / F-TPE is preferably 30/70 to 70/30, and the crosslinking agent is preferably 3 to 7 PHR. 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.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

In the insulated wire of the present invention constructed as described above, first, the copper alloy having the above-mentioned compositions I to III forming the flexible conductor is bent as described in JP-A-61-23736. It has excellent properties and is comparable in conductivity 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.

Further, the outer cover keeps wear 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.

[0019]

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.

[0020]

[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.

The composition (II) or (I
Similar effects could be obtained by using the copper alloy of II).

[0027]

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

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[Procedure amendment]

[Submission date] August 13, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

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

Claims (5)

[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] The total content of lead and tin is 0.02 to 0.15.
A copper alloy having a weight percentage of 0.006% by weight or more, an oxygen content of 0.0001 to 0.005% by weight, and the balance being substantially 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. A copper alloy in which the total content of tin and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper. 3. The heat-resistant, bend-resistant and wear-resistant insulated electric wire according to claim 1, wherein the copper alloy has the following composition. A copper alloy in which the total content of tin and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper. 4. The weight ratio of the admixture is 30/70 to 70 /.
The heat-resistant, bending-resistant and wear-resistant insulated wire according to any one of claims 1 to 3, wherein the insulated wire is 30. 5. The heat-resistant, bend-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.