JPS6313206A - Self-fusing insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insulated wire for winding, particularly an insulated wire having a self-bonding film.

[Prior art and its problems]

Coil moldings used in electrical equipment, communication equipment, etc. have been made by winding insulated wires into a predetermined shape and then impregnating them with varnish to bond and solidify the wires. Due to the fact that impregnation treatment is unfavorable from a safety and health standpoint and problems regarding work efficiency, self-bonding insulated wires that can fuse wires together by heating alone have recently been developed and are now in widespread use.

Coating materials used for such insulated wires include polyvinyl butyral resin, polyvinyl formal resin, copolymerized polyamide resin, phenoxy resin, etc.II! It is known that thermosetting paints are made by blending curing agents such as chain polymer resins, epoxy resins, and stabilized isocyanates, but fc paints are made by dissolving only the former in a solvent. The wear resistance of self-fusing insulation II@ coated and baked is relatively small compared to general enamelled wire, but as the winding process speeds up, winding@
The occurrence of scratches due to machine nozzles, pulleys, etc. tends to increase, and countermeasures against layer shorts and the like caused by this have become a problem. M:b Apply the latter film material and bake it.If you use insulated cotton wire, apply the paint to the B stage (
In order to maintain the semi-cured state and provide fusion properties, we used a paint consisting only of the former linear polymer compound, which achieved 9 self-fusion properties (P! The abrasion resistance is even lower than that of edge wires, and the need for countermeasures against scratches caused by the winding machine and layer shorts caused by n is extremely costly.

In order to solve these problems, it is necessary to improve the wear resistance of self-fusing insulated wires and reduce the coefficient of friction. Methods such as applying lubricating oil to an extent that does not have a negative effect on adhesion are taken.

However, even with this method, it is not possible to withstand the harsh handling that has come with the increase in the speed of wire winding processing in recent years, and the current situation is that processing scratches on the insulation film cannot be avoided due to the JJO processing of the wire winding. be.

[Means for solving problems]

This invention provides a self-fusing insulating wire with excellent abrasion resistance, which is formed by self-fusing a linear polymer compound as a main component directly on a conductor or through another insulating coating. Sex IV
In the electric wire provided with e@+@, the self-adhesive insulation is made of alpha alumina single crystal powder (hereinafter abbreviated as alpha At powder) with an average particle size of IQ μm or less based on the total amount of resin. ) is added in an amount of 10% by weight or less and 0.7% by weight or more, and the self-fusing insulated wire is made of nine paints coated and baked I-.

In this invention, mainly composed of straight and jet polymer compounds,
The wear resistance of the self-adhesive insulating layer is improved by adding α・At powder with an average particle size of fO μm or less,
α・A4 powder with an average particle size exceeding 10 μm will not be used as an insulated wire because the appearance of the wire will deteriorate no matter what the composition.

However, if the additive liquid of α-Fist At powder exceeds 1% of the resin content based on the linear polymer compound, the adhesive strength at high temperatures will decrease and the heat-resistant life characteristics will be affected. , ma-fc, 0. When the ratio is less than , / heavy duty %, almost no improvement in wear resistance is observed.

In this invention, by adding σ-At powder of 70 μm or less to the resin content mainly consisting of a linear polymer compound, the appearance is good, the abrasion resistance is excellent, and the high-temperature adhesive strength is improved. , self-bonding insulated wire with less deterioration in heat resistance and life characteristics, more preferably α less than μ
・The At powder is finely dispersed in the coating film and has a good appearance, and its addition amount is 10% by weight or more. :%, the high-temperature adhesive strength is good, the degree of deterioration in heat-resistant life characteristics is extremely small, and the wear resistance is sufficiently improved.

The paint mainly composed of a linear polymer compound used in this invention is a combination of linear polymer compounds such as phenoxy resin, polyvinyl butyral resin, polyvinyl formal resin, copolymerized polyamide resin, etc. alone or in combination of 2 or more. Or insulation 1! In order to create a thermally stable bonding film that exceeds chemical and mechanical bonding between the wires, epoxy resin and stabilized isocyanine (MIIJi) are used to heat and fuse the wires.
ffj, urea-formaldehyde condensate, melamine-formaldehyde condensate, acetoguanamine-formaldehyde condensate, aniline-formaldehyde 1d compound, benzoguanamine-formaldehyde 1 compound, these are modified with alcohol, amino resin, phenol 1, and cresol are also xylenol. There are also condensates of P-vinylphenol and other phenolic resins, and those obtained by blending phenol resins such as P-vinylphenol alone or in combination of two or more and dissolving them in a soluble solvent.

In addition, the α・At powder used here has an n-jt spherical polyhedral shape with ridges of phosphor crystals, contains almost no cracks or crystal distortion, and has excellent chemical stability. It has the strength of ig. In addition, this α・At powder contains almost no agglomerated grains and is covered with smooth crystal growth surfaces, so compared to conventional crushed alumina grains and calcined grains,
It shows good dispersibility.

Therefore, even if this α・A powder is directly added to the adhesive paint, it can be easily dispersed, and the mixing process with the adhesive paint can be completed in a short time.

〔Example〕

Coating of polyesterimide with a coating thickness of υ020 m on the copper wire of straight 1Q strip. 22 phenoxy resins were soaked in the coating, and 16 parts by weight of a 10% solution of alcohol-modified melamine/formaldehyde condensate was added to cyclohexanone. In the dissolved 62 parts by weight, 0.0% based on the resin content.
An adhesive paint made by dispersing α At powder (Showlite; manufactured by Showa Denko Co., Ltd.) with an average particle diameter of μm was baked on a layer of cloth so that the film thickness was 0.0/μm. A self-fusing insulated electric machine of the present invention is obtained.

Example 2 The content of α・At powder on the same polyesterimide wire as in Example 1 was 0% to 7% by weight based on the resin content.
A self-bonding insulated wire of the present invention was prepared by applying and baking the same adhesive paint as in Example t, except for binding, so that the film thickness was 0.0/yunmen.

Practical row 3 On the same polyesterimide wire as in Example 1, an adhesive paint was applied in the same manner as in Example 1, except that the content of α/At powder was 20 times the resin content. The self-fusing insulated wire of the present invention was obtained by coating and baking the wire so that the wire had a thickness of 0.0/rip.

Example μ: On the same polyesterimide wire as in Example 1, an adhesive paint having a coating thickness of 0% by weight of α・A powder relative to the resin content and the same as in Example 1 except for 9 was applied. The self-fusing property of the present invention was obtained by coating and baking the film so that it became 0.0/yellow.

Example 2 On the same polyesterimide wire as in Example 1, the content ratio of αφA1 powder was 0.0% relative to the resin content. Ot
The self-bonding insulated wire of this invention was manufactured by applying and baking the same adhesive paint as in t41 / so that the film layer became %7"C6 Example 6, except that the bond was set as %.
On the same polyesterimide wire as in Example 1, 30 weight tS of phenoxy resin was dissolved in 60 parts by weight of cyclohexquinone, and 20 weight % of the resin content was mixed with fake α@At with an average particle diameter of 3'μ. Adhesive paint made by dispersing powder with a film thickness of 00
The self-fusing insulated NT wire of the present invention was obtained by baking military cloth to a weight of 1 m.

Actual 1ir 4 row 7 On the same polyester imide wire as in the final example, 9 parts by weight of polyvinyl acetal resin, 6 tt parts of phenoxy resin, 21 ≠ parts by weight of solution of alcohol-modified melamine/formaldehyde condensate, 17 parts by weight After melting in the heavy section, apply an adhesive paint made by dispersing α・At powder with an average particle size of 0f-fet% based on the resin content so that the film thickness is a0ti. The self-bonding insulated wire of the present invention was obtained by baking.

Comparative Example 1 On the same polyester imide wire as in Example 1, the same adhesive paint as in Example 1 except that it did not contain σ/At powder was applied so that the skin PA4 was 0.0/coat and baked to self-fuse. 20 Comparative Example 2 On the same polyester imide wire as in Example 1, apply the same adhesive paint as in Example 6 except that it does not contain α/Aj powder so that the film thickness is aOly■, and bake it. @Layered insulated wire 6 Comparative example 3 α on the same polyester imide wire as in Example 1
・Self-bonding insulation by applying and baking the same adhesive as the actual relic except that it does not contain At powder to a film thickness of 0.01 mm, @Toji'r-C6 Comparative example ψ Diameter C5 A commercially available polyesterimide paint is applied to the copper wire with a film thickness of 0.
The insulation wire was coated and baked to a thickness of 0.020 m.

The results of a comparative test conducted on the insulated wires of each of these implementations and comparative examples are shown in the following table.

As can be seen from this table, the self-bonding insulated wire of the present invention exhibits adhesive strength similar to that of the comparative example, and has excellent performance such as extremely good abrasion resistance.

Note that this invention is not limited to the above embodiments,
Naturally, it is possible to change the resin material within a predetermined range and to select the blending amount within a predetermined range.

〔Effect of the invention〕

As explained above, 1 The self-bonding insulation tS of the present invention has alpha alumina powder added to the self-bonding insulating layer, so it maintains sufficient self-bonding properties and has wear resistance. The insulation film is not damaged even by K, such as increasing the speed of winding, and has excellent characteristics.

Claims (1)

[Claims] In an insulated wire in which a self-adhesive insulating layer mainly made of a linear polymer compound is provided on the conductor directly or through another insulating coating, the self-adhesive insulating layer is made of resin. A self-adhesive insulated wire comprising a coated and baked layer of paint to which 10% by weight or more but 0.1% by weight or more of alpha alumina single crystal powder having an average particle diameter of 10 μm or less is added.