JPS6036047B2 - Manufacturing method of self-fused electric wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing a self-fusing electric wire. More specifically, the present invention relates to a method for manufacturing a new self-fusing electric wire. This article relates to a method for manufacturing attachable electric wires.

Recently, when producing coils for electrical equipment and communication equipment, for example, the method of heat-treating self-fusing wires after winding to fuse the wires into a single piece has become more popular than the conventional method from the viewpoint of process simplification and workability. This method is becoming widely used as an alternative to the method of applying varnish treatment after winding and curing by heating. Conventionally, this type of self-fusing electric wire is made by applying ordinary enamel paint using a bond coating method, baking it to form an insulating film, and then applying vinyl formal resin, phenoxy resin, nylon, or vinyl butyral resin on top of this film. Currently, they are manufactured by dissolving them in specific organic solvents, coating them, and then baking them.

However, conventional manufacturing methods have many drawbacks, such as the complexity of the manufacturing process and safety and health problems due to the use of large amounts of organic solvents. The present inventors have conducted various studies on manufacturing methods to improve the above-mentioned drawbacks, and as a result, have completed the present invention.

That is, in the present invention, an enameled electric wire (underlying layer) is formed by exposure using a conventionally used water dispersion varnish for lightning, and then electrostatic powder coating is applied using a powder coating, and organic solvent is removed by heating. A self-welding wire is manufactured without using any wires. The aqueous dispersion for electrodeposition used in the present invention is preferably a thermosetting acrylic aqueous dispersion, a polyester aqueous dispersion, a polyesterimide aqueous dispersion, etc. For formation, the dispersed particle size of the aqueous dispersion is important.

A suitable particle size is in the range of 0.01 m to 21 OAm. Further, as the powder coating used in the present invention, phenoxy resins, sulfone resins, epoxy resins, vinyl formal resins, polyester resins, etc. are suitably used, but in this case, the important point is that heating at 200 o'clock or less The lower part is fused and integrated, which means that the adhesive strength is good.
Additionally, the wire is uniform and non-tacky at room temperature. For this purpose, the melting temperature and particle size of the powder coating are important points, and the melting temperature is preferably in the range of 70°C to 200°C, and the particle size is preferably 20mm or less. Furthermore, as the powder coating method, fluid immersion method, electrostatic dynamic immersion method, electrostatic spray method, etc. are preferably used. Next, an example of a manufacturing apparatus for a self-welding wire used in carrying out the present invention is shown in the figure.

In the figure, 1 is a bare copper wire, 2 is a hazing tank using a thermosetting water dispersion, 3 is a steam treatment tank for an organic solvent, and 4.
5 is a baking furnace, 6 is a powder coating device, 7 is an air inlet, 8 is a
is a filter, 9 is a powder coating, and 10 is a heating furnace. Next, the operation will be explained. First, a thermosetting resin is deposited on the bare copper wire 1 by passing through a hazing tank 2 containing a thermosetting water dispersion, and then steam-treated in a solvent steam tank 3 (approximately 3 V to 50 V). The enameled electric wire is then combined in baking furnaces 4 and 5 to obtain an enamelled electric wire. The heated enamelled wire is coated in a powder coating tank 6 and, if necessary, heated and melted to obtain the desired self-bonding wire. In this case, the organic solvent used in the steam tank 3 is required to dissolve or swell the dispersed particles electrodeposited in the lightning deposition tank 2, and varies depending on the dispersed particles, but suitable organic solvents include: Examples include those having a boiling point of 100 oo or more, such as dimethylformamide, dimethylacetamide, N-methylpyrrolihydone, dimethyl oxide, ethylene glycol, and jettylene glycol. Note that there are no particular limitations on the line speed, the conditions for haze deposition, the temperature of the heating furnace, the conditions for powder coating, the thickness of the coating due to desorption, the thickness of the coating due to powder coating, the ratio of these coating thicknesses, etc. These may be determined as appropriate depending on the use of the electric wire, required characteristics, etc. The method for producing a self-welding electric wire of the present invention will be described below with reference to examples using the apparatus shown in the drawings, but of course, a horizontal type apparatus may also be used, and various modifications may be made without impairing the effects of the present invention. It goes without saying that transformation is possible. Implementation row 1 Electrodeposition is carried out using an acrylic moisture solution consisting of acrylonitrile, styrene, ethyl acrylate, methacrylic acid, and glycidyl metal acrylate in the electroplating tank 2 shown in the figure at a dew voltage of 5 V, and dimethylformamide vapor is applied in the vapor tank 3. Processed with
Baking furnace 4, temperature 3 set at temperature 200-3000C
After passing through the baking furnace 5 set at 00 to 40000,
A self-fused wire was obtained by powder coating using a powder coating (average particle size: about 3) consisting of 7 parts of phenoxy resin and 3 parts of sulfone resin.

Implementation row 2 The aqueous dispersion to be placed in the lightning tank 2 was a polyesterimide aqueous dispersion containing trimethic anhydride, diaminodiphenylmethane, ethylene glycol, tris(8-hydroxyethyl) isomyanurate, polyethylene terephthalate, and hexahydrophthalic anhydride. A self-bonding wire was obtained in the same manner as in Example 1, except that N-methylpyrrolidone was used in steam bath 3.

Practical row 3 As a powder coating, [Epicoat 1009] 10 parts, 2
A self-bonding wire was obtained in the same manner as in Example 1, except that a powder coating consisting of 1 part of phenylimidazole and 4 parts of vinyl butyral tree (average particle size 10 French) was used.

Table 1 shows the characteristics measured for the self-welding wire of the present invention obtained based on the above-mentioned self-implementation sequence and the self-welding wire obtained by the conventional method.

Table 1 (*1) Tensile strength when the coil is disassembled after being tightly wound for one length on the mantrell on the 5th side.

As is clear from Table 1, the self-fusing electric wire produced by the manufacturing method combined with the haze coating method according to the present invention has superior uniformity and adhesive strength compared to those obtained by the conventional dipping coating method. , and can be obtained through a simple process without using a large amount of organic solvent, resulting in a marked improvement in productivity.

[Brief explanation of drawings]

The figure is a configuration diagram showing an example of a self-fusing electric wire manufacturing apparatus used to carry out the manufacturing method of the present invention. In the figure, 1 is bare copper wire, 2 is an electrodeposition tank, 3 is an organic solvent steam treatment tank, 4 and 5 are both Akatsuki furnace, 6 is a powder coating equipment, 1
Kawama is a heating furnace.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a self-fusing electric wire, which comprises electrodepositing a conductor with an aqueous dispersion for electrodeposition, and then powder-coating the conductor with a heat-meltable powder coating. 2. The method for manufacturing a self-welding wire according to claim 1, characterized in that an acrylic aqueous dispersion is used as the aqueous dispersion for electrodeposition. 3. The method for producing a self-welding wire according to claim 1, characterized in that a polyester or polyester ide-based aqueous dispersion is used as the aqueous dispersion for electrodeposition. 4. The method for producing a self-fusing electric wire according to any one of claims 1 to 3, characterized in that a phenoxy resin, a sulfone resin, or an epoxy resin is used as the powder coating. 5. The method for manufacturing a self-fusing electric wire according to any one of claims 1 to 4, characterized in that an electrostatic powder coating method is used for powder coating.