JPH04115417A - Insulated wire - Google Patents

Abstract

PURPOSE:To exhibit excellent lubricating, anti-wear and heat-resisting properties by applying and baking paint, in which a prescribed quantity of polyethylene and high-boiling point aromatic hydrocarbon is added to nylon 46 resin as a main agent, directly on a conductor or on an insulated layer. CONSTITUTION:Polyethylene of 0.1 to 5wt.% as a lubricant is added into paint for forming a surface film, in which nylon 46 resin as a main agent dissolved in a solvent, to 100wt.% of nylon 46 resin, further, 1 to 100wt.% of high-boiling point aromatic hydrocarbon is added. A substance manufactured by further improving stability of the paint and lubrication of the surface and uniformalizing dispersion of polyethylene is applied and baked directly on a conductor or on an insulating layer thereof for forming a surface film. Thereby, an insulated wire has a character combining the excellent lubricating, anti-wear and heat- resisting properties so as to sufficiently endure automatic winding processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to improvements in insulated wires, and particularly to insulated wires with excellent surface lubricity and wear resistance.

(Prior art) Conventionally, in order to improve the resistance to processing deterioration during the winding process of insulated wires, baking coatings with excellent lubricity have been used to coat the wire surface with various types of lubricity. A high-quality insulated wire has been proposed.

For such slippery insulated wires, baking of polyester, polyurethane, polyamide-imide, etc. is possible by applying a paint containing nylon 6 or nylon 6.6 as the main component, or Some commonly used insulating paints are coated with a paint film that has excellent lubricity by baking a paint in which a lubricant such as fine polyethylene powder or fluororesin powder is dispersed.

However, those with a surface coating mainly composed of nylon 6 or nylon 66 have excellent lubricity, but
They have insufficient wear resistance and are easily scratched during the winding process using automatic winding machines, and nylon 6 and nylon 6.6 have low heat resistance, so a heat-resistant resin such as polyamide-imide is used for the lower layer. However, there are problems in that the surface coating deteriorates and the heat softening temperature of the entire insulated wire decreases, resulting in a decrease in heat resistance.

In addition, when using commonly used insulating paints with lubricants such as fine polyethylene powder or fluorine resin powders dispersed in them, the lubricants with poor compatibility with solvents and dispersibility often separate in the paint, causing The stability is extremely poor, and therefore a uniform insulating coating cannot be obtained, and electric wires coated with this coating have problems such as poor appearance and low surface smoothness.

(Problems to be Solved by the Invention) In view of the above points, an object of the present invention is to provide an insulated wire that has excellent surface lubricity and wear resistance, and has improved heat resistance.

(Means for Solving the Problems) The present invention provides an insulated wire in which a surface coating is provided on a conductor directly or via an insulating layer, wherein the surface coating is mainly composed of nylon 46 resin. This invention relates to insulated wires.

The insulating layer in the present invention can be formed by applying and baking a coating film-forming paint, which is commonly used, and specifically, formal, polyester, polyesterimide, polyurethane, epoxy, polyamideimide, etc. Baked film-forming paints are obtained by using a polyimide-based, nylon-based, polyhydantoin-based, or a mixture thereof as a base polymer and mixing a solvent commonly used for these resins.

In the present invention, a surface coating is provided either directly on the conductor or on these insulating layers by applying and baking a coating for forming a surface coating in which nylon 46 resin is dissolved in a solvent. nylon 4
6 resin is one in which four methylene groups are regularly arranged between amide groups in the molecular chain, and specifically, TS300 (
manufactured by Japan Synthetic Rubber Co., Ltd. (product name).

Further, in order to further improve the lubricity of the surface coating, polyethylene can be added as a lubricant together with a high-boiling aromatic hydrocarbon in addition to the nylon 46 resin. As the polyethylene, low molecular weight polyethylene (molecular weight of about 3000 to 5000), which has been conventionally known as a lubricant, as well as general high molecular weight polyethylene powder, etc. can be used. Examples of low molecular weight polyethylene include Hiwax 210P, Hiwax 405MP, and Hiwax 400P (all manufactured by Mitsui Petrochemical Co., Ltd.).
Examples include product name). Examples of high molecular weight polyethylene include Efselen VL100 (trade name, manufactured by Sumitomo Chemical Co., Ltd.), Hiwax 8000F (trade name, manufactured by Mitsui Petrochemical Industries, Ltd.), and the like.

In addition, in the present invention, the blending amount of polyethylene is 0.1 to 5 parts by weight per 100 parts by weight of nylon 46 resin, and if it is less than 0.1 part by weight, the effect of improving the slipperiness of the resulting coating film is small; Moreover, if it exceeds 5 parts by weight, the stability of the coating material will deteriorate. In addition, when using high molecular weight polyethylene, it is desirable that the blending amount does not exceed 1 part by weight from the viewpoint of coating stability.

When such polyethylene is added, a high-boiling aromatic hydrocarbon is used in combination to disperse it and stabilize the coating material, as well as to improve lubricity.

Specifically, there are meta(para)ethyl biphenyl, diethyl biphenyl, triethyl biphenyl, distyryl xylene, phenyl xylylethane, phenyl trimethyl phenylethane, phenyl xylyl propane, phenyl trimethyl phenyl propane, etc., and these have a boiling point of about 200 They can be used alone or in combination at temperatures above °C. From the viewpoint of compatibility with polyethylene, phenylxylylethane is particularly preferred. In addition, the blending amount of these high-boiling aromatic hydrocarbons is 1 to 100 parts by weight per 100 parts by weight of nylon 46 resin; if it is less than 1 part by weight, the dispersion of polyethylene tends to become uneven;
If the amount exceeds 1 part by weight, the resulting coating film may become softened.

The paint for forming a surface film in the present invention is prepared by dissolving nylon 46 resin in a solvent, and if necessary, if it is desired to further improve the lubricity, the above polyethylene is mixed with the above high boiling point aromatic hydrocarbon. Approximately 100℃ when added in proportion
After heating to the above temperature to melt the polyethylene, the mixture is left to cool to room temperature while stirring sufficiently, and the mixture is then mixed with a nylon 46 resin paint at room temperature.

(Function) Since the insulated wire of the present invention is provided with a surface coating mainly composed of nylon 46, it is possible to significantly improve wear resistance and heat resistance without impairing lubricity.

Furthermore, if polyethylene powder and high-boiling aromatic hydrocarbon are used in combination with nylon 46 in a predetermined ratio, wear resistance and lubricity can be further improved without impairing paint stability.

(Example) Examples of the present invention will be described.

Examples 1 to 2 A 34 μm thick polyester paint (manufactured by Toshiba Chemical Corporation, product name TVE 5350) was applied on a copper conductor with a diameter of 10 μm.
The wire was coated and baked to a thickness of 2 μm, and then a surface film-forming paint prepared by dispersing the ingredients shown in the table in a cresol solvent was baked to a thickness of 2 μm to produce an insulated wire. The baking conditions are: baking speed 14 m/min, furnace temperature 250°C5 at the bottom.
The temperature was 320°C in the middle and 370°C in the upper part. Using the obtained insulated wire, a drag resistance test (reciprocating wear test with a load of 700 g), static friction coefficient,
Thermal softening temperature 5 and dielectric breakdown voltage were measured. The results are shown in the table.

Comparative Example 1 For comparison, an electric wire was produced by baking the same insulated wire core as in Example 1 under the same conditions, with the surface coated with a nylon 66-based paint having the composition shown in the table. The obtained electric wire was similarly tested and the results are shown in the table.

(The following is a blank space) (Effects of the invention) As described above, the insulated wire of the present invention has excellent lubricity and wear resistance,
It also has the property of being heat resistant, and can withstand winding processing using an automatic winding machine, and can also be used in high-temperature atmospheres, making it widely applicable to a wide range of applications.

Claims (2)

[Claims] (1) An insulated wire comprising a surface coating provided directly or via an insulating layer on a conductor, wherein the surface coating has nylon 46 resin as a main component. (2) The surface coating is formed by applying and baking a paint consisting of 100 parts by weight of nylon 46 resin, 0.1 to 5 parts by weight of polyethylene, 1 to 100 parts by weight of high-boiling aromatic hydrocarbon, and a solvent. The insulated wire according to claim 1.