JPH06223635A - Insulated wire - Google Patents

Abstract

PURPOSE:To achieve excellent terminal treatability and cable flexibility and to prevent disconnection of wire when it is pulled out of a bobbin. CONSTITUTION:An insulated wire has a conductor 1 and a ultraviolet-setting resin composition 2 which is set by exposure to ultraviolet radiation. Fatty acid amide is added to the ultraviolet-setting resin composition 2. Therefore the surface of an ultraviolet-set coating made of the ultraviolet-setting resin composition has smaller frictional resistance than usual.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire.

[0002]

2. Description of the Related Art In recent years, with the miniaturization and weight reduction of computers, audios, automobiles, aircrafts, artificial satellites, etc., and with the high-density mounting, the electric wires and cables used for them have been further reduced in diameter and thickness. It has become to. One of the methods is thinning of the coating. The thinner the film is made by the extrusion method, the more easily the film becomes thinner, and the strain caused by the temperature difference between the coating material and the conductor is more likely to affect it, which is likely to cause a decrease in elongation. For this reason, the conductor is preheated well, but when the conductor becomes thin, the strength of the conductor is reduced by the heat of preheating, and the wire is likely to be broken due to the pressure of the material at the time of extrusion, which is not desirable. Enameled wire is very effective if it can be applied to such applications as an electric wire with a thin film thickness. However, enamel wire usually requires a coating and baking process.
Need to be repeated more than once, many things 50%
Since the materials are occupied by organic solvents, large-scale safety equipment is required, and because it is baked, it is not as easy as polyethylene or polyvinyl chloride, and the film peeling property is poor. Not desirable as a cable.

A solvent-free liquid liquid UV-crosslinking resin composition (UV-curing resin composition) has been attracting attention as a means for thin coating, and it is used as a coating material for optical fibers. Above all, urethane acrylate is used. It is known that many system materials are used. These UV-crosslinkable resin compositions are radical polymerization, ionic polymerization, cationic polymerization, etc. using UV rays, and the method of curing mainly by radical polymerization is well known. Since it is liquid, thin coating is easy and the curing speed is fast, which has a great effect on productivity. Further, it is solvent-free and has higher safety than thermosetting varnish used for enameled wire, and can be obtained by applying once or several times to obtain an arbitrary film thickness. In addition, the colorless and transparent resin composition has an advantage that coloring is easier than that of a thermosetting varnish.

[0004]

The UV-crosslinkable resin composition of the above-mentioned prior art is effective as a coating material for thin-walled, small-diameter electric wires. As the diameter of electric wires has been reduced, dozens or hundreds of bundled cables are connected at terminals by crimping or crimping using a connector. For connecting a connector of such a terminal, a method of unwinding twisted electric wires at the time of forming a cable and arranging the electric wires in parallel and connecting them is required, and slippage between the wires is required. Therefore, it is necessary to reduce the frictional resistance on the surface of the insulated wire and make it slippery. However, it is difficult to make the UV-crosslinkable material extremely hard, because the coating material of the insulated wire requires elongation, and the friction resistance of the surface of the hardened coating is large, and the thinner the wire, the more the contact area between the wires. Increase, and problems such as adhesion between lines occur.

Further, a cable in which many electric wires having a large surface friction resistance are bundled has a problem that the flexibility is extremely poor and the wireability is poor. In addition to this, when the thin wire is pulled out from the bobbin, there is a problem such as disconnection due to adhesion between the wires.

The present invention has been made in view of the above points, and an object of the present invention is to provide an insulated electric wire which is excellent in terminal processability and which is flexible in the cable and capable of preventing disconnection when the cable is pulled out from the bobbin. To do.

[0007]

[Means for Solving the Problems] The above object is to add a fatty acid amide to an ultraviolet-curable resin composition,
To be achieved.

[0008]

Since the above means is provided, the friction resistance of the surface of the ultraviolet curable resin composition coated with the ultraviolet curable resin composition becomes smaller than in the conventional case.

The inventors of the present invention have conducted various studies based on the finding that an ultraviolet curable resin composition is used as a coating material.

The resin composition which is cured by irradiation with ultraviolet rays is intended for ultraviolet curable resin compositions,
Basically, it is composed of photopolymerizable oligomer, photopolymerizable monomer, photoinitiator and the like. What is a photopolymerizable oligomer (prepolymer)?
For example, epoxy acrylate, epoxidized oil acrylate, urethane acrylate, polyester urethane acrylate, polyether urethane acrylate, polyester acrylate, polyether acrylate, vinyl acrylate, silicone acrylate, polybutadiene acrylate, Various oligomers such as polystyrene ethyl methacrylate type, polycarbonate dicarbonate type, unsaturated polyester type, polyene / thiol type, etc., which have functional groups having unsaturated double bonds such as acryloyl group, methacryloyl group, allyl group and vinyl group Have more than one. The oligomer may be fluorine-substituted, or two or more kinds of oligomers may be combined.

As the photopolymerizable monomer, a known compound having one or two or more functional groups such as acryloyl group, methacryloyl group, vinyl group and allyl group in the molecule can be used.

The photopolymerization initiator has a function of initiating a polymerization reaction of a photopolymerizable oligomer or monomer, and has a role of receiving a UV ray to generate a free radical. This free radical is necessary for ultraviolet crosslinking, and the photopolymerization initiator is a substance that easily absorbs a specific wavelength by irradiation with ultraviolet to be in an electronically excited state to generate a radical. For example, benzoin ether type, ketal type, acetophenone type,
There are benzophenone type, thioxanthone type and the like, and various photopolymerization initiators can be used according to the purpose.

The fatty acid amide may be any one classified into monoamides, substituted amides, methylol amides, bisamides and the like.

Monoamides are classified into saturated fatty acid monoamides and unsaturated fatty acid monoamides. Examples of saturated fatty acid monoamides include lauric acid amide, balmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide. As unsaturated fatty acid monoamide, oleic acid amide,
Examples include erucic acid amide and ricinoleic acid amide.

Substituted amides include N-stearyl stearic acid amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, N-oleyl palmitic acid amide. And so on.

Examples of the methylol amides include methylolsarinic acid amide and methylol hepnic acid amide.

Bisamides can be divided into saturated fatty acid bisamides, unsaturated fatty acid bisamides, aromatic bisamides and the like.

Examples of the saturated fatty acid bisamide include methylenebisstearic acid amide, ethylenebiscapric acid amide, ethylenebislauric acid amide, ethylenebisstearic acid amide, ethylenebisisostearic acid amide, ethylenebishydroxystearic acid amide, and ethylenebisheben. Acid amide, hexamethylenebisstearic acid amide, N, N'-distearyl adipic acid amide, N, N'-distearyl sebacic acid amide, and the like.

Examples of the unsaturated fatty acid bisamide include ethylene bis oleic acid amide, hexamethylene bis oleic acid amide, N, N'-dioleyl adipate amide, N, N'-dioleyl sebacic acid amide and the like.

Examples of aromatic bisamides include n-xylylenebisstearic acid amide and N, N'-distearylisophthalic acid amide.

These may be used alone or in combination of two or more. The addition amount is not particularly specified, but is preferably within 0.05 to 5% by weight. If it is less than 0.05, the effect of reducing the surface friction resistance cannot be obtained, and if it is more than 5 parts by weight, the effect of reducing the surface friction resistance cannot be obtained depending on the addition amount, and problems such as a decrease in the mechanical strength of the coating layer occur. .

Further, the melting point of these fatty acid amides is set to 100 ° C. or lower by heating the UV-curable resin composition and once dissolving and dispersing the fatty acid amide to further reduce the friction coefficient of the surface of the cured coating layer. This is because

In addition to these, if necessary, a photoinitiator aid, an adhesion preventive agent, a thixotropy imparting agent, a filler, a plasticizer, a non-reactive polymer, a colorant, a flame retardant, a flame retardant aid, an anti-softening agent, a mold release agent. Agents, desiccants, dispersants, wetting agents, suspending agents, thickeners,
Antistatic agent, antistatic agent, antifungal agent, rodentproofing agent, antitermite agent,
Matting agents, anti-blocking agents, anti-skinning agents, and other various inorganic compounds and organic compounds can be used in combination.

From the above, it was found that the fatty acid amide should be added to the ultraviolet curable resin composition. Therefore, in the present invention, a fatty acid amide is added to the ultraviolet curable resin composition. By doing so, it is possible to provide an insulated electric wire having excellent terminal processability and capable of preventing the breakage of the cable when it is pulled out from the bobbin and the flexibility of the cable.

[0025]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Example 1] 100 parts by weight of urethane acrylate oligomer U-122A (manufactured by Shin-Nakamura Chemical Co., Ltd.) and 100 parts of isobornyl acrylate (manufactured by Kyoeisha Oil and Fat Chemical Co., Ltd.)
UV cross-linking resin consisting of 1 part by weight, 10 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone (manufactured by Ciba Geigy) and 1 part by weight of methylenebisstearic acid amide (trade name; bisamide: melting point 143 ° C.). After coating the composition on a bare annealed copper wire conductor 0.05 (1 / 0.05), it is cured through an ultraviolet irradiation furnace to obtain an insulation thickness of 16
An insulated electric wire of μm was obtained.

Example 2 100 parts by weight of urethane acrylate oligomer U-122A, 50 parts by weight of isobornyl acrylate, 7.5 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone and amide of erucic acid (commercial product) Name: Armoslip E: melting point 82 ° C.) A bare annealed copper wire conductor 0.0
After coating 5 (1 / 0.05), it was cured by passing through an ultraviolet irradiation furnace to obtain an insulated electric wire having an insulation thickness of 15 μm.

Example 3 100 parts by weight of urethane acrylate oligomer U-122A, 50 parts by weight of isobornyl acrylate, 7.5 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone and 1 part by weight of erucic acid amide. Part of the UV-crosslinkable resin composition is heated to 90 ° C., and then the UV-crosslinkable resin composition heated to 40 ° C. is coated on the bare annealed copper wire conductor 0.05 (1 / 0.05) to irradiate it with ultraviolet rays. It was cured through a furnace to obtain an insulated electric wire having an insulation thickness of 15 μm.

Example 4 100 parts by weight of urethane acrylate oligomer U-122A, 50 parts by weight of isobornyl acrylate, 7.5 parts by weight of photoinitiator 2,2-dimethoxy-2-phenylacetophenone and N-oleyl oleic acid. Amide (trade name; Nikka Amide O: melting point 4)
5 ° C.) 1 part by weight of the UV-crosslinkable resin composition 60
After heating to 0 ° C., a bare annealed copper wire conductor 0.05 (1 / 0.05) is coated with a 40 ° C. ultraviolet crosslinking resin composition,
It was cured through an ultraviolet irradiation furnace to obtain an insulated electric wire having an insulation thickness of 15 μm.

Comparative Example 1 100 parts by weight of urethane acrylate oligomer U-122A, 100 parts by weight of isobornyl acrylate and 2,2-dimethoxy-2 as a photoinitiator.
-A UV-crosslinkable resin composition consisting of 10 parts by weight of phenylacetophenone was added to a bare annealed copper wire conductor 0.05 (1 / 0.0
5) After coating on top, cure through an ultraviolet irradiation oven,
An insulated electric wire having an insulation thickness of 15 μm was obtained.

These Examples 1, 2, 3, 4 and Comparative Example 1
Table 1 shows the characteristics of the insulated wire.

[0032]

[Table 1]

The characteristics of each electric wire were evaluated by the following test methods.

(1) Surface friction coefficient The surface friction resistance was measured by the Heidon method.

(2) Adhesion between wires To evaluate the adhesion between wires, an insulated electric wire having a conductor diameter of 0.05 mm was wound on a bobbin, and the insulated electric wire was drawn from the bobbin at a wire speed of 5
It was drawn out at 0 to 100 m / min and judged by the presence or absence of the occurrence of wire breakage. The occurrence of disconnection was rated as ×, and the absence of disconnection was rated as ○.

(3) Breakdown voltage The breakdown voltage between wires was measured by the twist pair method.

(4) Adhesion The insulated wire is taken to have a certain length, and after being rapidly extended,
The presence or absence of cracks was examined by observing the image twice. When there was a crack, it was marked with X, and when there was no crack, it was marked with ◯.

(5) Surface hardness The surface hardness is JIS S600 according to JIS D0202.
It measured using the pencil shown by 6.

As is clear from Table 1, in Examples 1 to 4 according to the present invention, the surface friction resistance was smaller than that of Comparative Example 1 and good results were obtained without sticking between the lines.
Furthermore, from Examples 1 and 2, by once heating the ultraviolet curable resin composition to a temperature above the melting point of the fatty acid amide, the surface friction resistance can be further reduced.

The structure of the insulated wire according to this embodiment is shown in FIG. In FIG. 1A, a conductor (single wire) 1 is coated with an ultraviolet curable resin composition 2. In the same figure (b), a plurality of twisted conductors (stranded wires) 1 are collectively covered with an ultraviolet curable resin composition 2. In the same figure (c), (b) is covered with the collective plating layer 3. In the same figure (d), a plurality of twisted (a) are collectively covered with the sheath 4. In the same figure (e), a plurality of twisted (b) are collectively covered with the sheath 4.

As described above, according to this example, the surface frictional resistance can be easily reduced by adding the fatty acid amide to the ultraviolet-crosslinkable resin composition, and the adhesion between the wires can be prevented, so that the thin wire can be used. In addition to preventing disconnection when the bobbin is pulled out, the flexibility of the cable when a large number of insulated electric wires are bundled can be maintained.

[0042]

As described above, according to the present invention, since the fatty acid amide is added to the ultraviolet curable resin composition, the friction resistance of the ultraviolet curable coating surface of the ultraviolet curable resin composition becomes smaller than that of the conventional one, and the terminal It is possible to obtain an insulated electric wire having excellent processability and capable of preventing the disconnection of the cable when it is pulled out from the bobbin and the flexibility of the cable.

[Brief description of drawings]

FIG. 1 shows an embodiment of an insulated wire of the present invention, (a) is a vertical sectional side view showing a state in which a conductor (single wire) is coated with an ultraviolet curable resin composition, and (b) is a twisted plural Of the conductor (twisted wire) in the state of being collectively covered with the ultraviolet curable resin composition, (c) is a side view of the state in which (b) is covered by the collective plating layer, and (d) is ( (A) is a vertical cross-sectional side view showing a state in which a plurality of twisted strands are collectively covered with a sheath, and (e) is a vertical cross-sectional side view showing a state in which a plurality of twisted strands are collectively covered with a sheath. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 conductor 2 UV curable resin composition 3 batch plating layer 4 sheath

Front Page Continuation (72) Inventor Norio Takahata 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Power Systems Co., Ltd.

Claims (2)

[Claims] 1. An insulated wire having a conductor and an ultraviolet curable resin composition coating the outer periphery of the conductor, wherein the ultraviolet curable resin composition is an insulated wire cured by irradiation with ultraviolet rays. An insulated wire characterized by the addition of fatty acid amide to the product. 2. The fatty acid amide has a melting point of 100.
The insulated electric wire according to claim 1, which has a temperature of ℃ or less.