JPS6158112A - Repairing tape of adhesive 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] [Technical Field of the Invention] This invention relates to a repair tape for bonded electric wires, and in particular to a repair tape for self-adhesive electric wires or a peeled portion between an adhesive and an enamel coating of a self-adhesive electric wire. Or about tape for repairing scratches.

[Prior art]

Conventionally, as coils for electric induction equipment, motors, etc., enamel i = c' polynisdel, polyvinyl formal, polyimide, etc., have been coated and baked onto a conductor. After winding insulated wire such as fiber wound wire into a predetermined shape,
There was also one in which the wires were impregnated with varnish to adhere them to each other and integrate them into one piece.

However, in recent years, with the aim of reducing the man-hours required for the varnish impregnation process and improving workability, self-bonding electric wires (such as phenoxy resin, polyamide, polyester, etc. (enameled wire coated with a B-stage adhesive such as self-adhesive wire resin).

Such self-bonding or self-adhesive electric wires are generally round wires. However, recently, thin rectangular self-bonding or self-adhesive wires have been used in electrical induction equipment such as transformers and accelerators to reduce eddy current loss in conductors. .

An example of an application using such a flat wire is Jitsukaishi! ;
J-21147! Publication R, Miyukiaki! Composite paper winding disclosed in R7-/IF/ publication, or Jikko Akihiro 7-Hiroshi 32? There are composite insulated wires shown in Publication No. U.

A problem in making such adhesive conductors is that self-bonding or self-adhesive wires create joints in the middle of the wire. Figure 1 shows a conventional welded part of a rectangular wire. 1 is the peeled part of the enamel 2, and 3 is the brazing material.

As shown in the figure, the enamel coating is removed by approximately 10 Clr1 for repair so that the enamel coating is not damaged by the heat during welding. The repair material for this peeled part is required to have self-fusion or self-adhesive properties, and oil resistance since it is used in oil.

Conventionally, the repair of enameled wire was done by Tokukai An Yoko/, 37&I.
For example, a method of applying a thermosetting liquid resin such as epoxy resin or urethane resin to the repaired area and heating it, without referring to the coating film repair method for enameled wire described in Publication No. O. was there.

However, in the case of repairing self-bonding or self-adhesive electric wires, an appropriate method has not been found because the repaired portion must also have self-bonding or self-adhesive properties.

[Summary of the invention]

However, the present invention was made in view of these circumstances, and provides an enamelled self-bonding rectangular electric wire or a self-adhesive rectangular electric wire that has excellent voltage resistance and oil resistance and has self-bonding or self-adhesive properties. To provide a repair tape that can be easily repaired.

This invention is a repair tape for adhesive wires, characterized in that it is made by coating either phenoxy resin, epoxy resin, or phenol resin on both sides of a film made of polyamide, polyimide, or polyvinyl alcohol.

In this invention, the polyamide, polyimide, or polyvinyl alcohol film is a polymer film with excellent oil resistance, thermal properties, and electrical properties, and can be used as a film sheet or tape. A repair tape is prepared by coating either a phenoxy resin, an epoxy resin, or a phenol resin with good oil resistance as an adhesive on both sides of this film sheet or tape. The obtained repair tape is wound around the peeled part or scratched part of the enamel coating of the enameled wire, self-adhesive rectangular electric wire, self-adhesive rectangular electric wire, etc.

This repair tape self-fuses or self-adheres during heat bonding between strands in a subsequent process. In this way, the repair tape made by Kinei aAVc can easily repair electric wires because the only necessary step is winding.

[Embodiments of the invention]

The present invention will be explained below based on Examples.

Select a commercially available film made of polypropylene, polyester (polyethylene terephthalate), polyvinyl chloride, polyamide, polyimide, polyvinylidene chloride, fluororesin, polyvinyl alcohol, acetyl cellulose, or polyethylene, and (1) oil resistance and (co) adhesion. Power,
(J) Thermal properties, and (4') i! Electrical characteristics tests were conducted. The test results are shown in Table 1, and each characteristic test was conducted as follows.

(1) Oil resistance The oil resistance test was conducted using JIS/Type U insulating oil so that the surface area of the film was 4tO and d.
Heated for 3200 hours. The film used in the oil resistance test was made into a strip with a width of 10cm (a in the figure) and a length of 10cm7rL (b in the figure) as shown in Figure 1 in order to conduct a tensile test.

Among the io types of films, polyvinyl chloride was hard, probably because the plasticizer was dissolved in the insulating oil.

Moreover, the polyvinylchloride/polyethylene was dissolved in the insulating oil, and the insulating oil was cloudy.

In addition, the tensile test was performed using a universal tensile tester, and the tensile strength before and after heating was compared. The smaller the value is than 1, the more the influence of heating in oil increases.

When polyvinylidene chloride and polyethylene dissolved in insulating oil are excluded, the tensile strength of polyester and polyvinyl chloride is significantly reduced.

(2) Adhesive Strength Adhesive strength was determined by tensile strength using a universal tensile tester as shown in Figure 1, and observing the state of breakage. The adhesive was applied by dipping a strip of film into a cellosolve solution containing io% phenoxy resin, heating at 120° C. for 10 minutes, and drying. In FIG. 2, numeral 2 indicates the film, 5 indicates the adhesive coating area, and F indicates the tensile direction.

The films were bonded to each other at 120° C. for 5 hours with a load of t kg/crl applied to the bonding surfaces.

In the case of non-polar polymers such as polypropylene, polyethylene, and fluororesin Q, peeling occurred at the adhesive surface.

Other films were broken at the film.

(3) Thermal properties Melting point was investigated using a differential scanning calorimeter. Although no clear melting point was observed for those marked with -, the melting points seem to be quite high in all cases.

The melting point of polyamide (manufactured by DuPont, nylon) is close to 200°C, which is good.Polyimide has class H heat resistance.

(4') The withstand voltage of acetyl cellulose with i-characteristic properties is significantly lower than that of others. Since the enameled wire coating has a withstand voltage of approximately 0.0 kV/knit, the film is also desired to have a withstand voltage of this level.

Judging from the results of the above characteristic tests, polyamide, polyimide, and polyvinyl alcohol were good as films for repair tapes.

Next, oil contamination tests were conducted on phenoxy resins, epoxy resins, and phenol resins shown in Table 2 as adhesives. Note that the epoxy resin and phenol resin components are representative examples, and the present invention is not necessarily limited to the components in Table WC2.

The test results are shown in Table 3.

Table 2 Adhesive components Table 3 Oil staining test results Values at $50''C, other values at room temperature For the test, adhesive was applied to both sides of the polyimide film.
After heating at 20'C for 70 minutes, it was heated at /20C for 200 hours so that the surface area was ttocvt per 100M of JIS/Class No. 2 insulating oil. This heated oil was compared with a blank.

The blank here refers to oil only at 710°C.

It was heated for 200 hours.

As adhesives, phenoxy resin, epoxy resin, and phenol resin were all free from oil staining and were good.

〔Effect of the invention〕

As explained above, this invention is made by coating both sides of a film with excellent oil resistance, adhesive strength, heat resistance, and electrical properties with an adhesive that does not cause oil contamination. It has the advantage that it can be used for

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a conventional rectangular electric wire, and FIG. 2 is a schematic view of a test piece in a tensile test according to an embodiment of the present invention. In the figure, lII enamel peeling part, Yu fist enamel, J... row material, da... film, 5... adhesive application part, =-m-''-
1111・

Claims (1)

[Claims] 1. A repair tape for adhesive wires, characterized in that it is made by coating either phenoxy resin, epoxy resin, or phenol resin on both sides of a film made of polyamide, polyimide, or polyvinyl alcohol.