JPH044512A - Insulated wire - Google Patents

Abstract

PURPOSE:To maintain a characteristic sound enough even when the thickness of a coating is reduced by extrusively coating a composition in which polysulfon is blended at a specified weight part to 100 weight part of polyetherimide, on a conductor. CONSTITUTION:A composition in which polysulfon is blended at 100-200 weight part to 100 weight part of polyetherimide, is extrusively coated on a conductor. The polyetherimide is a thermoplastic resin that has an ether linkage and an imide linkage in a molecule. The polysulfon is a thermoplastic resin that has an arylene linkage, an ether linkage, and a sulfon linkage. When the amount of polysulfon is less than 100 weight part to 100 weight part of polyetherimide, the increasing degree of extension is small, while abrasion proof of the blended composition is sacrificed when the amount of polysulfon exceeds 200 weight part. The deterioration in mechanical strength such as abrasion proof is thus not anticipated even when the coating of an insulated wire is thinned, and an extension characteristic can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables application of an extremely thin coating, which allows the layer to be made smaller in diameter and has sufficient mechanical properties and wear resistance. The present invention also relates to a new thin-walled insulated wire having the necessary electrical insulation performance.

[Prior Art] In recent years, communication equipment and precision electronic equipment have shown a remarkable trend toward miniaturization and high-density packaging.Furthermore, many small precision equipment with such various functions are being installed in automobiles and other vehicles. In order to make effective use of limited space, not only the internal wiring of devices, but also the wires that connect these devices are being made with thinner insulators and smaller diameter wires. The demand for this is increasing. As insulators for wiring within the precision equipment mentioned above and thin wiring between equipment, except for special cases such as inside computers, resin compositions mainly made of polyvinyl chloride and polyethylene, which are cheaper than conventional ones, are used. things have been commonly used.

[Problems to be Solved by the Invention] Conventional resin compositions mainly made of polyvinyl chloride or polyethylene as described above have a limit even if they can be made thin, and furthermore, the mechanical There was a problem in that the strength, especially the wear characteristics, was greatly reduced.

Therefore, as a solution to such problems, it has been proposed to use so-called engineering plastics, which have high mechanical strength, as the insulating material.

Polyetherimide is one such material, and it has been confirmed that it exhibits extremely excellent wear resistance when coated as an insulator. However, when this polyetherimide is used as an insulating coating material for electric wires, it has low elongation, making it difficult to put it to practical use.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of polyetherimide, to make it possible to use it as an insulating coating material, and to maintain sufficiently sound characteristics even when the coating thickness is reduced. The aim is to provide a new insulated wire.

[Means for Solving the Problems] The present invention is made by extrusion coating a conductor with a composition in which 100 to 200 parts by weight of polysulfone is blended with 100 parts by weight of polyetherimide.

The polyetherimide used in the present invention is a thermoplastic resin having ether bonds and imide bonds in the molecule, and a typical polyetherimide has the following formula: Focusing on abrasion resistance, from the perspective of blending materials that can increase elongation without impairing such abrasion resistance, we created a polymer alloy by blending various materials selected from rubber and plastic materials. We have considered this.

As a result, it was revealed that the elongation properties could be greatly improved by blending polysulfone, which is a type of engineering plastic, in a specific range, and by extrusion coating this as an insulating layer, the desired properties were achieved. The inventors discovered that thin-walled insulated wires can be obtained, leading to the present invention.

The polysulfone used in the present invention has an arylene bond,
A typical polysulfone, which is a thermoplastic resin having an ether bond and a sulfone bond, is represented by the following formula.

The amount of polysulfone blended with polyetherimide is 100 to 20 parts by weight per 100 parts by weight of polyetherimide.
It needs to be 0 parts by weight. If the amount of polysulfone is less than 100 parts by weight per 100 parts by weight of polyetherimide, the increase in elongation will be small, and if it exceeds 200 parts by weight, the abrasion resistance of the blend composition will be impaired.

In the composition range of the present invention, the polyetherimide is dispersed in the form of fibers in the continuous phase of polysulfone, and by adopting such a structure, the polysulfone constituting the continuous phase has a fibrous shape with respect to elongation, and a fibrous shape with respect to wear. It is believed that polyetherimide dispersed in

Note that other additives may be added to the resin composition of the present invention. Examples of these additives include plasticizers, pigments, flame retardant agents, heat stabilizers, and lubricants. Furthermore, the material may be modified by irradiation with radiation such as electron beams or gamma rays.

[Examples] The present invention will be specifically described below with reference to Examples and Comparative Examples.

A resin composition having the amounts shown in Examples 1 to 3 and Comparative Examples 1 to 4 in Table 1 was prepared, and applied onto a 0.3 x 2 annealed copper stranded wire conductor to a coating thickness of 0.1 mm. A test insulated wire was obtained by extrusion coating.

The wear test is based on the JASO standard for low-voltage electric wires for automobiles.
It was based on the scrape test of D-611.

That is, Fig. 1 is an explanatory diagram showing the state of the wear test, where 1 is an electric wire, 2 is a blade, 3 is a weight, 4 is a clamp that holds down the electric wire 1, 5 is a test stand, and 6 is a reciprocating test machine. It is.

As shown in FIG. 1, a blade 2 shown in FIG. 2 having an edge radius of 0.125 mm is applied to the surface of the coating 11 of the electric wire 1, and is reciprocated with a stroke of 10 mm at a speed of 60 times per minute. As a result, the coating 11 was worn out, and the number of reciprocations until the blade came into contact with the conductor 12 was determined, and those that withstood 150 times or more were judged to have passed.

Note that the load applied to the blade was adjusted to 510 g.

In addition, regarding elongation, it is based on J I5C3005,
The measurement was performed using a test piece made into a tube shape by pulling out the conductor.

The respective evaluation results are shown in the lower column of Table 1.

Examples 1 to 3 according to the present invention all show good results in both wear resistance and elongation.

On the other hand, Comparative Example 1 using only polyetherimide and Comparative Example 4 using only polysulfone each had insufficient elongation and abrasion resistance. Comparative Examples 2 and 3, which are blend compositions outside the scope of the present invention, also have insufficient elongation and abrasion resistance, respectively.

[Effects of the Invention] As explained above, according to the present invention, by using so-called engineering plastics, even if the coating of the insulated wire is thinned, there is no risk of reduction in mechanical strength such as abrasion resistance, and the elongation is reduced. As the properties have been greatly improved, it is possible to obtain thin-walled, small-diameter insulated wires with excellent properties, and the industrial significance of this is that it can appropriately respond to the miniaturization and weight reduction of today's equipment. There's something big.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of the scrape abrasion tester, and FIG. 2 is an explanatory diagram of the shape of the tip of the blade. 1: electric wire, 2 blades, 3: weight, 4. clamp, 5: test stand, 6: reciprocating motion tester, 11: coating, 12. conductor.

Claims (1)

[Claims] (1) An insulated wire formed by extrusion coating a conductor with a composition obtained by blending 100 to 200 parts by weight of polysulfone with 100 parts by weight of polyetherimide.