JPS621760A - Self-lubricating insulated wire - Google Patents

Abstract

PURPOSE:To produce the titled electric wire having high insulation property and suitable for the coil of communication apparatus, with simple procedure at a low cost, by applying a powder coating containing a specific fluororesin to a conductor directly or interposing an another insulation layer therebetween, and baking the coated wire. CONSTITUTION:100pts.(wt.) of a base paint is compound with preferably 0.1-10pts. of fluororesin powder having an average particle diameter of <=10mum, and the mixture is thoroughly kneaded to obtain a uniform dispersion. The obtained powder coating is applied uniformly to a conductor and baked to obtain the objective electric wire.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a self-lubricating insulated wire used as a wire for equipment coils such as electrical and communication equipment.

``Prior art'' As the winding speed of insulated wires used for equipment coils has increased in recent years, improving the resistance to processing deterioration has become a major issue. There is a method to reduce friction during the winding process by adding lubricity to the surface of the wire.

Conventionally, the above-mentioned surface-lubricated wires have been coated with a lubricating oil such as suniso oil or transformer oil, paraffin, or wax on the surface of an insulated wire such as an enameled wire, or by applying a lubricating material such as paraffin or wax on the surface of an insulated wire such as an enameled wire. Otsu's etc., which are coated with nylon paint and baked on, are used.

"Problems to be Solved by the Invention" The conventional surface-lubricated electric wire described above requires two steps: a step of applying and baking an insulating material such as enamel, and a step of applying a lubricating material. Therefore, the manufacturing process of the above-mentioned electric wire is complicated and there is a problem that the cost is high.

Furthermore, among the above-mentioned wires, it is difficult to apply a uniform amount of lubricating oil, wax, or paraffin, and since these lubricating materials are only coated, friction This has the disadvantage that it easily comes off and stains the winding device during the winding process.

``Purpose of the Invention'' This invention was made in view of the above circumstances, and its purpose is to provide a self-lubricating insulated wire with a simple manufacturing process, low cost, and high insulation performance. It is something.

``Structure of the Invention'' The self-lubricating insulated wire of the present invention is made by applying a powder coating made by adding and uniformly dispersing fluororesin powder with an average particle size of 10 μm or less to the surface of a conductor and baking it. be.

"Specific Structure of the Invention and Its Effects" FIG. 1 is a diagram showing an embodiment of the self-lubricating insulated wire of the present invention. In this figure, reference numeral 1 denotes a conductor having a circular cross section and made of a conductive material such as copper or aluminum. An insulating layer 2 having a uniform thickness is formed on the outer periphery of the conductor 1. This insulating layer 2 consists of a base resin 3 such as epoxy resin, polyamide resin, or polyester resin, and a large number of spherical particles 4 made of fluororesin, and these particles 4 are uniformly distributed in the base resin. A portion of the insulating layer 2 is exposed on the surface of the insulating layer 2.

Next, a method for manufacturing this self-lubricating insulated wire will be explained.

As the fluororesin used as a powder in this invention, the following are suitable.

1. Hynylidene fluoride (PVdF) Melting point: 171°C 2. Ethylene-ethylene tetrafluoride (polymer (ETEF)
) Melting point 270°C3, tetrafluoroethylene-hexafluoropropylene copolymer
Melting point 275°C4 Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer Melting point 310
°C5, Tetrafluoroethylene resin Melting point: 330 °C The more spherical the fluororesin particle shape is, the better it is dispersed in the paint, and the higher the surface lubricity of the manufactured electric wire.Furthermore, the melting point of this powder is such that the particle shape is maintained even after baking. It is desirable that the temperature be higher than the paint baking temperature so that the paint will sag.

Examples of the resin paint serving as the base resin 3 include resins such as epoxy, polyamide, polyester, acrylic, polyetheretherketone (PEEK), urethane, and vinyl chloride resin, and these may be used alone or in an appropriate combination of two or more. .

Next, the above base paint and powdered fluororesin are mixed. 0 powdered fluororesin per 100 parts by weight of base paint
．． A total of 1 to 10 parts by weight is added, and these are sufficiently kneaded to uniformly disperse the powdered fluororesin in the base paint, and then pulverized to form a powder paint. If the addition ratio of the powdered fluororesin is less than 0.1 parts by weight, sufficient lubricity will not be obtained after baking, and if it is more than 10 parts by weight, although excellent lubricity will be obtained, The adhesion to the conductor will decrease and the paint will peel off easily. Next, the powder coating thus prepared is uniformly applied to the conductive wire and baked. As a coating method, a film is formed using an ordinary electrostatic powder coating method.

The self-lubricating insulated wire manufactured in this way has extremely high surface lubricity, and when winding at high speed when manufacturing equipment coils, etc., the insulating layer 2 may crack or peel. There's nothing to do.

Furthermore, this electric wire has a single-layer structure in which the insulating layer 2 itself has lubricating properties, and is manufactured by applying and baking operations twice, so that the manufacturing process is simpler and the cost can be lowered than in the past.

Moreover, even when the wire surface is strongly rubbed, the fluororesin particles are always exposed on the wire surface and maintains lubricity, so this wire has extremely high resistance to processing deterioration.

Note that, as shown in FIG. 2, it is possible to provide a structure in which an insulating layer 5 made of another insulating paint is provided between the conductor 1 and the above-mentioned insulating layer 2.

Further, the conductor l may have a cross section other than a circular one, and various modifications such as a rectangular wire can be considered as necessary.

"Experiment example" Hereinafter, the effects of the present invention will be made clearer by giving experimental examples.

(Experimental Example 1) Powder polytetrafluoroethylene resin (Daikin Industries, Ltd. Lublon L 75, average particle diameter 7 μrx, melting point 330°C) was added, and the mixture was kneaded and pulverized at a low temperature to prepare a powder coating with an average particle size of 25 μU. Next, this powder coating was applied and baked on the copper wire so that the thickness of the insulating layer was 401 tm.
A self-lubricating insulated wire was created.

(Experimental Example 2) Powdered polytetrafluoroethylene resin (Hostafron TF-9202 manufactured by Hoechst, average particle diameter 2.5 μm, melting point 324-327°C) was used as the powdered fluororesin. The same operation as in Experimental Example 1) was performed.

(Comparative Example 1) Powder epoxy resin Xrt-5256 manufactured by Sumitomo 3M Co., Ltd. was used in 1.
The insulating layer was coated and baked on a 0 mm copper wire so that the thickness of the insulating layer was 40 μm. Next, Snifoil was applied as a lubricant to the outer periphery of the wire to create a surface-lubricated insulated wire.

(Comparative Example 2) The same operation as in Comparative Example 1 was performed except that 125°F paraffin was used as the lubricant.

Next, the four lubricated insulated wires obtained as described above were subjected to the following tests, and the results shown in Table 1 were obtained.

Flexibility test; JIS C3003,8,1(1)
by.

Pinhole test, according to JIS C3003.6.

Dielectric breakdown voltage (BDV); JIS C3003, 11
(2)1. ：、niru.

Reciprocating wear test; Based on old publication SC3003, lQ, l.

As is clear from the results in Table 1, this self-lubricating insulated wire exhibits high wear resistance without impairing insulation performance and flexibility.

``Effects of the Invention'' The self-lubricating insulated wire of this invention uses fluororesin powder added to an insulating paint and uniformly dispersed powder, and is applied directly onto the conductor or by applying another insulating layer. Since it is formed by coating and baking through a coating and baking process, it can be manufactured in two coating and baking steps, and the cost can be reduced.

Furthermore, since this self-lubricating insulated wire has lubricity in its insulating layer itself, it does not lose its lubricity due to friction or the like, and has excellent processing deterioration resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the self-lubricating insulated wire of the present invention, and FIG. 2 is a sectional view showing a second embodiment of the self-lubricating insulated wire. ! ...Conducting wire 2...Insulating layer 3...Fluororesin particles 5...Other insulating layer

Claims (1)

[Claims] A self-lubricating insulated wire made by applying and baking a powder coating made by adding powdered fluororesin having an average particle diameter of 10 μm or less onto the conductor directly or through another insulating layer.