JPH0368072B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention can withstand modern high speed automatic coil winding.
This invention relates to an insulated wire with excellent processing resistance. Rationalization is rapidly progressing in the coil winding process for motors, transformers, etc., and high-speed automatic coil winding machines are being actively introduced. In the process of high-speed self-winding, the surface coating of the electric wire is often damaged, resulting in an increase in defects such as rare shorts, and there is a strong desire for insulated wire with characteristics that can withstand this. Conventionally, methods for improving the machining resistance of insulated wires include applying oil to the coating of insulated wires, coating and baking a lubricating resin such as nylon, or applying polyamide-imide resin with excellent mechanical performance. Overcoating methods have been used. However, even if oil is applied, it is impossible to expect a significant improvement in processing resistance, and overcoating with nylon and polyamide-imide resin requires a large number of steps and the resin cost is high, which significantly increases the cost of the insulated wire and improves its properties. Although it is good, there are restrictions on its use and it is not widely used. In view of the above circumstances, the inventors of the present invention have conducted intensive research to obtain an insulated wire with excellent processing resistance and low cost, and as a result, have achieved the present invention. That is, the present invention uses a paint obtained by blending 0.1 to 5 parts by weight of a melamine cyanurate compound obtained by reacting 1 mole of melamine with 1 mole of isocyanuric acid or cyanuric acid to 100 parts by weight of the resin content of the insulating paint. An insulated wire characterized by being coated and baked directly onto a conductor or via another insulator. First, the melamine cyanurate compound used in the present invention is obtained by associating 1 mole of melamine with 1 mole of isocyanuric acid or cyanuric acid as shown in the following formula. Next, the electrical insulation paints used in the present invention include most commonly used resin paints, such as polyester resin paints, polyurethane resin paints, polyimide resin paints, polyesterimide resin paints, polyamide-imide resin paints, polyamide resin paints, and formal resin paints. , epoxy resin paint, etc. can be used. Furthermore, the solvents for these paints include organic solvents such as cresol, water-based paints,
Furthermore, it can also be applied to non-solvent type paints and self-fusing paints. A specific example of the melamine cyanurate compound is the trade name (MCA) manufactured by Yuka Melamine Co., Ltd. In the present invention, the amount of melamine cyanurate compound added to 100 parts by weight of the resin content of the insulating paint is
The reason why the amount was limited to 0.1 to 5 parts by weight is that if the amount is less than 0.1, the effect of the additive formulation will not be apparent, and if it is more than 5 parts by weight, the processing resistance of the resulting insulated wire will not improve much by increasing the amount, and conversely, the coating surface of the insulated wire will deteriorate. This is because there is a risk of causing abnormalities. In addition, to improve the dispersibility of melamine cyanurate compounds in insulation paints, anionic, cationic,
A nonionic surfactant may also be added. Furthermore, a lubricant such as silicone oil may also be added as an auxiliary ingredient. Note that the effects of the present invention can be sufficiently achieved by applying the present invention not only to the conductor but also only to the uppermost layer of the insulated wire coating. Next, the present invention will be explained by giving examples and comparative examples. Example 1 Melamine cyanurate in a mixed solvent of cresol and naphtha in a polyester resin solution (concentration 40%) obtained with terephthalic acid, ethylene glycol, and glycerin as main components Compound (Product name of Yuka Melamine Co., Ltd.)
MCA) dispersed solution is added to polyester resin.
A paint was obtained by adding 1 part of the melamine cyanurate compound to 100 parts by weight. This paint was applied and baked 5 times in a conventional manner onto a copper wire having a diameter of 1.0 mm to obtain an insulated wire of the present invention having a coating thickness of 35 μm. Example 2 0.5 parts by weight of a melamine cyanurate compound (mentioned above) per 100 parts by weight of the resin content of a commercially available polyesterimide paint (manufactured by Nippon Schenectaday Co., Ltd. under the trade name Isomid) Naphthalenesulfonic acid condensate as an anionic surfactant (Toho Chemical Co., Ltd., trade name Lunox 1000) was added in an amount of 0.1 part, and as a nonionic surfactant, sorbitan monooleate (Toho Chemical Co., Ltd. product Sorbon S-80) was added.
Uniformly dispersed with a homogenizer. The resulting paint was repeatedly coated and baked on a copper wire with a diameter of 1.0 mmφ using a conventional method to obtain a coating thickness of 35 μm.
An insulated wire of the present invention was obtained. Example 3 Polyurethane resin paint (trade name manufactured by Totoku Toyo Co., Ltd.)
TPU-F ₂ -50) was repeatedly coated and baked on a copper wire with a diameter of 1.0 mm using a conventional method to obtain a polyurethane electric wire having a coating of 30 μm. On the other hand, 6,6-nylon (trade name manufactured by Toray Industries, Inc.)
CM3001) was dissolved in a mixture of cresol and solvent naphtha to obtain a nylon resin solution with a concentration of 12%.
To 100 parts by weight of the resin content of this nylon resin solution, 3 parts by weight of a melamine cyanurate compound was added and mixed in the form of a dispersion in cresol and solvent naphtha. The thus obtained paint was applied and baked on the previously obtained polyurethane electric wire to a thickness of 5 μm using a conventional method. Thus, an insulated wire of the present invention was obtained. Example 4 A polyesterimide resin paint (trade name: Isomid, manufactured by Nippon Schenectaday Co., Ltd.) was coated and baked on a copper wire having a diameter of 1.0 mm by a conventional method to obtain a polyesterimide electric wire having a film having a thickness of 25 μm. On the other hand, phenoxy resin (trade name manufactured by UCC, USA)
PKHH) is dissolved in cresol and solvent naphtha, and the melamine cyanurate compound (mentioned above) is added and blended in the form of dispersion in cresol and solvent naphtha in an amount of 4 parts by weight per 100 parts by weight of phenoxy resin solid content. A self-fusing paint with a concentration of 20% was prepared. This paint was coated and baked on the previously obtained polyesterimide wire to a thickness of 10 μm by a conventional method to obtain an insulated wire of the present invention. Comparative Example 1 The same polyester resin solution used in Example 1 was coated and baked on a copper wire with a diameter of 1.0 mm by a conventional method to obtain a polyester electric wire having a coating with a thickness of 35 μm. Comparative Example 2 A commercially available polyesterimide paint (trade name: Isomid, manufactured by Nikko Skektaday Co., Ltd.) was coated and baked on a 1.0 mmφ copper wire by a conventional method to obtain a polyesterimide electric wire having a film of 35 μm. Comparative Example 3 Polyurethane resin paint (trade name manufactured by Totoku Paint Co., Ltd.)
TPU-F ₂ -50) was repeatedly coated and baked on a copper wire with a diameter of 1.0 mm to form a 30 μ thick film, and then 6,6-nylon (trade name: CM3001 manufactured by Toray Industries, Inc.) was applied on top of that.
A 12% cresol/solvent naphtha solution was applied and baked to form a film with a thickness of 5μ. Comparative Example 4 A polyester imide resin paint (product name: Isomid, manufactured by Nippon Schenectaday Co., Ltd.) was repeatedly applied and baked on a copper wire with a diameter of 1.0 mm to form a 25 μ thick film.
Furthermore, a 20% cresol/solvent naphtha solution of phenoxy resin (trade name PKHH, manufactured by UCC Corporation, USA) was applied and baked to a thickness of 10 μm to obtain a self-fused wire. In order to examine the winding workability of each insulated wire obtained in Examples 1 to 4 and Comparative Examples 1 to 4, the following types of tests were conducted. The results obtained are shown in Table 1.

【table】

[Table] As shown in Table 1, the coating of the insulated wire of the present invention is strong and slippery, and it is clear that the insulated wire has superior processing resistance compared to conventional products.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus for measuring the coefficient of static friction of an insulated wire. Figure 2 is a schematic diagram of the NEMA1000VAC defect number measuring device. 1... Glass plate, 2, 2'... Insulated wire, 3...
...iron plate, 4...weight, 5...bead needle.

Claims (1)

[Claims] 1. For 100 parts by weight of resin in electrical insulation paint,
A paint containing 0.1 to 5 parts by weight of a melamine cyanurate compound obtained by reacting 1 mole of melamine with 1 mole of isocyanuric acid or 1 mole of cyanuric acid was applied to the conductor directly or via another insulator and baked. An insulated wire characterized by: