JPH0612922A - Insulated cable - Google Patents

Abstract

PURPOSE:To obtain an insulated cable which can maintain self lubricity at processing of a cable and has excellent processing resistance by providing a plurality of antifriction composition baked layers around the insulating cover layer on a conductor. CONSTITUTION:A plurality of antifriction composition baked layers 3 and 4 are provided around the insulating cover layer 12 covering a conductor 1 such as a copper wire, an aluminum wire, or the like. These antifriction composition baked layers 3 and 4 can be obtained by repeating the process of applying a baking type antifriction composition on the cable, where the conductor 1 is covered with the insulating cover layer 2 in advance, and baking it at, for example, about 300-600 deg.C in furnace and then, hardening it a required number of times. Since the adhesive strength of the interface between these antifriction composition baked layers 3 and 4 is weak, exfoliation occurs between the layers at termination in processing of an insulated cable, and the exfoliation never occurs between the layers of the conductor 1 and the insulated cover layer 2.

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 self-lubricating property and excellent workability.

[0002]

2. Description of the Related Art Conventionally, in order to prevent damage to an insulating coating layer due to friction generated during electric wire processing such as coil winding,
A method of applying self-lubricating property by applying a baking type antifriction agent such as a composition of carnauba wax and shellac resin to the outer periphery of the insulating coating layer and baking and curing to form an antifriction agent baking layer having a film thickness of about 1 μm. Is being done.

[0003]

However, in such a conventional technique, the resistance of the obtained self-lubricating insulated wire to processing was not sufficient in a certain type of wire processing step.
For example, at the end of the coil winding step, the wound coil may be molded and fixed with powdered resin or the like. At this time, in the coil terminal treatment after molding, there is a step of peeling the wire end from the mold. . At this time, in the conventional anti-friction agent baking layer, since the adhesive force between this layer and the mold resin is strong, peeling occurs between the conductor of the electric wire and the insulating coating layer, and the conductor is exposed. Occurred. Therefore, it is an object of the present invention to provide an insulated electric wire having excellent workability while maintaining the self-lubricating property when the electric wire is processed.

[0004]

This problem can be solved by providing an insulated electric wire in which a plurality of antifriction agent baking layers are provided on the outer periphery of the insulating coating layer.

[0005]

As described above, the insulated wire of the present invention has a structure in which two or more anti-friction agent baking layers are provided on the outer periphery of the insulating coating layer that covers the conductor. The adhesive force at the interface between the anti-friction agent baking layers in this configuration is such that the high lubricity of both causes the peeling between the insulating coating layer and the anti-friction agent baking layer and between the anti-friction agent baking layer and the mold resin. It is weaker than power. In such an insulated wire of the present invention, when the terminal is to be peeled from the mold resin, peeling may occur between the layers of the plurality of anti-friction agent baking layers, and peeling may occur between the conductor and the insulating coating layer. There is no. Therefore, it is possible to prevent the conductor from being exposed in an electric wire processing step in which the electric wire end is peeled off from the mold resin, and it is possible to improve the workability of the insulated electric wire.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the insulated wire of the present invention. In FIG. 1, 1 is a conductor. The conductor 1 is covered with an insulating coating layer 2. Insulation coating layer 2
The first anti-friction material baking layer 3 is provided on the outer periphery thereof, and the second anti-friction material baking layer 4 is further provided on the outer periphery thereof. The conductor 1 is a copper wire, an aluminum wire, or the like, and may be a single wire or a stranded wire. This thickness is not particularly limited,
Especially for those used as windings, the diameter is 0.
It is about 01 to 5.0 mm.

The insulating coating layer 2 is made of electrically insulating natural rubber, synthetic rubber, oil or fat, or synthetic resin. Particularly in the case of an insulated wire used as a winding, the insulation coating layer 2 is
It is preferably formed by applying an insulating material provided as various varnishes on a conductor and baking it. An electric wire provided with such a varnish on a conductor is, for example, an enamel copper wire, a formal copper wire, a nylon copper wire, a formal / nylon copper wire, a polyurethane copper wire, a polyester copper wire, a heat-resistant polyester copper wire, an esterimide copper wire, It is commercially available as a polyimide copper wire, a polyamide-imide copper wire, a water resistant synthetic enamel wire, a frontite wire and the like. When manufacturing the insulated wire of the present invention, these can be used as a substrate on which the antifriction material baking layer 3 is provided. The thickness of the insulating coating layer 2 can be selected according to the characteristics of the material, the thickness of the conductor, the characteristics required for the insulated wire, etc. and is not particularly limited, but is generally in the range of about 1 to 100 μm, and particularly 2 to 50 μm. Is preferred.

Examples of the baking type antifriction agent for forming the antifriction material baking layers 3 and 4 include a composition comprising carnauba wax and shellac resin (for example, TEC-9 manufactured by Toshiba Chemical Co., Ltd.).
601), or a wax composed of carnauba wax, candelilla wax, montan wax, rice wax, etc., and a thermosetting resin and a fluororesin (for example, JP-A-62-20).
No. 0605) and the like can be used. When these are applied and baked onto the insulating coating layer 2 or the first anti-friction material baking layer 3, the resulting anti-friction material baking layer has a cured heat containing dispersed particles of wax or fluororesin. It consists of a film of curable resin. At this time, the fine particles of the wax or the fluororesin are distributed at a particularly high density on the film surface, and this imparts lubricity to the surface of the anti-friction material baking layer. In this embodiment, two anti-friction material baking layers are provided, but the number is not limited to this, and three or more layers may be provided as required. The thickness of each layer of the anti-friction material baking layer is preferably selected in the range of 0.2 to 2 μm, provided that the total thickness of each layer is 0.5 to 2 μm.
It is preferable to adjust to the range, especially about 1 μm.

In order to manufacture such an insulated wire of the present invention, usual coating / baking steps for electric wires can be used. That is, a baking type anti-friction agent is applied to an electric wire having an insulating coating layer on the conductor in advance, and the electric wire is baked and hardened in a furnace to form an anti-friction agent baking layer on the outer circumference of the electric wire. Can be manufactured by. Baking temperature is 3
It is preferable to select within the range of 00 to 600 ° C. The bake type lubricant in each layer may be the same or different. However, it is necessary to bake and cure each layer.

(Example 1) A polyamide-imide resin was applied onto a copper conductor (1.0 mm in diameter) and baked to a thickness of 40.
An insulating layer having a thickness of μm was formed to obtain an insulated electric wire. A commercially available bake-type lubricant (TEC-made by Toshiba Chemical Co.
9601) was applied and baked and cured at 400 ° C. The same baking type anti-friction agent was further applied to the outer periphery of this product, which was baked and cured under the same conditions as the previous time, and an anti-friction agent baking layer having a total film thickness of about 1 μm was provided to provide the insulated wire of the present invention shown in FIG. Obtained.

(Comparative Example) An insulated wire of Comparative Example was obtained in exactly the same manner as in Example 1 except that the baking type lubricant of Example 1 was applied and baked only once to obtain a film thickness of about 1 μm. .

(Test Example) Each of the above insulated wires was wound with 10 model coils, molded with epoxy powder resin, and subjected to a peeling test of the end of the wire to observe whether or not the conductor was exposed. The results are shown in Table 1.

[0013]

[Table 1]

As is clear from the results of Table 1, the insulated wire of the present invention has excellent workability.

[0015]

EFFECTS OF THE INVENTION Since the insulated wire of the present invention is provided with a plurality of anti-friction agent baking layers on the outer periphery of the insulating coating layer, while maintaining the self-lubricating property during the processing of the wire,
Moreover, it has an effect of having excellent work resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an insulated wire of the present invention.

[Explanation of symbols]

 2 ... Insulating coating layer, 3, 4 ... Anti-friction material baking layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Kitami 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Electric Wire Co., Ltd.

Claims (1)

[Claims] 1. An insulated electric wire, wherein a plurality of anti-friction agent baking layers are provided on the outer periphery of the insulating coating layer.