JPH05217427A - Self-lubricating insulated wire - Google Patents

Abstract

PURPOSE:To provide a self-lubricating insulated wire excellent in self-lubricating characteristic, and having the equal impregnating varnish fastening strength to an insulated wire that is not selflubricated. CONSTITUTION:An insulating film is provided on a conductor by applying and baking a resinous paint including an acid anhydride transformed polyolefine resin by 0.1-5.0wt.% to a base insulating resin. A self-lubricating insulated wire having excellent and important characteristics is thus provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated electric wire having a self-lubricating property, and more particularly to improving the adhesion of an impregnated varnish in a self-lubricating insulated wire.

[0002]

2. Description of the Related Art In recent years, in the manufacturing process of electrical equipment,
Labor saving and rationalization have been actively carried out, and an insulated wire typified by an enameled wire used for these may be seriously damaged by, for example, high-speed winding work and its working work. These damages are the result of, for example, rationalization in the coil processing process or automation and speedup by the introduction of a high-speed automatic winding machine, and the space factor due to the miniaturization and higher performance of the electrical equipment itself. This is the result of improvement.

Such speeding up and space factor improvement are very severe conditions for the enamel wire used. That is, as the speed is increased, friction and wear with the pulley and the guide are increased, which may cause an electrical defect such that the insulating layer is broken in some cases. If the lubricity of the surface of the enamel wire is insufficient, a large amount of tension will be applied to the enamel wire, and it will be easily damaged. Therefore, the lubricity represented by the slidability of the enameled wire is one of the important characteristics of the enameled wire from the viewpoint of preventing the damage.

Therefore, it is necessary to improve the lubricity of the electric wire itself in order to provide the enamel wire which can be easily processed for winding while maintaining the reliability of the enamel wire.

Therefore, conventionally, in order to improve the lubricity of the surface of the electric wire, for example, a method of applying a lubricating oil or paraffin wax or a method of applying a resin having lubricity has been used. Further, a method of overcoating a polyamide resin or the like having lubricity is taken. Further, a method of adding a polyolefin wax such as polyethylene as a lubricating component to the insulating resin has also been proposed. However, when a polyolefin wax such as polyethylene or a natural wax is added to the insulating resin, sufficient lubricity is obtained, but it is used for solidification after winding the enamel wire into a motor or transformer shape. The compatibility with the impregnated varnish is poor, and, for example, the fixing force with the impregnated varnish is significantly reduced as compared with an insulated wire that is not self-lubricated.

Generally, in motors and transformers, the enamel wire is often wound into the shape of the equipment and then solidified with an impregnating varnish. The treatment with this impregnated varnish is
Motors, transformers, etc. are used in order to prevent the electric wires from being damaged by the vibration of the equipment or to reduce the electrical characteristics, and also to cope with the usage environment of the equipment. Therefore, the treatment with impregnated varnish is
This is a very important process.

[0007] The self-lubricating insulated electric wire is an extremely effective electric wire for the winding work, but in the subsequent varnish impregnation step, none of them showed very good characteristics in terms of the fixing force of the impregnated varnish. .. Further, as an electric wire characteristic, if importance is attached to the fixing force of the impregnated varnish, the self-lubricating property must be sacrificed.

[0008]

DISCLOSURE OF THE INVENTION The object of the present invention is, as a result of intensive studies conducted in view of the above-mentioned circumstances, that the self-lubricating property is particularly excellent, and the impregnating varnish fixing force equivalent to that of a non-self-lubricating wire is obtained. It is to provide a self-lubricating insulated wire having.

[0009]

According to the present invention, an acid anhydride-modified polyolefin resin is present on a conductor directly or through another insulating layer in an amount of 0.1 to 5.0% by weight based on the base insulating resin content.
The above-mentioned object is achieved by a self-lubricating insulated wire characterized in that an insulating film is provided by coating and baking the resin coating material contained therein.

[0010]

In the present invention, with respect to the base insulating resin component
By incorporating 0.1 to 5.0% by weight of acid anhydride-modified polyolefin resin, it is a drawback of self-lubricating insulated wire produced by using a resin coating containing a commonly used polyolefin wax. The fixing strength could be improved.

The acid anhydride-modified polyolefin resin used in the present invention has improved adhesiveness, which is a drawback of the polyolefin resin. For example, Mitsubishi Petrochemical Co., Ltd., trade name MODIC (registered trademark), Mitsui There is a product name Admer (registered trademark) manufactured by Petrochemical Co., Ltd. Among these modicities, L-400F, L-410C, M-200F and the like are the ones that are easily added to the resin to exhibit lubricity. In addition, among Admers, NF500, NF510, N
B550 etc. easily develop lubricity. The amount of this acid anhydride polyolefin added to the resin paint that constitutes the insulating film of the electric wire is somewhat dependent on the type of base insulating resin.
0.1 to 5.0% by weight is suitable. If the addition amount is less than 0.1% by weight, the self-lubricating property will not be exhibited in the obtained insulating film, and if added in excess of 5.0% by weight, the self-lubricating property of the obtained insulating film will be sufficient. However, the adhesion strength of the impregnated varnish is reduced, and the resulting insulating film is not transparent but devitrified.

The base insulating resin used for the resin paint in the present invention may be any resin as long as it can be applied as a resin paint and baked on the conductor surface. Specifically, polyester, polyurethane, polyimide, polyamide,
Examples thereof include polyamide imide, polyester imide, polyester amide imide, and polyvinyl formal.

In the present invention, the acid anhydride-modified polyolefin to be used is added both by a method of adding it so as to be contained in the entire insulating coating layer of the generally obtained insulated wire and by a method of adding it only to the outermost layer of the insulating layer. However, in the present invention, good results are obtained by any of these methods. However, since the lubricity of the insulated wire is due to the outermost layer of the insulating layer, sufficient lubricity can be obtained by adding the acid anhydride polyolefin resin only to the outermost layer of the insulating layer.

Next, the present invention will be described with reference to Examples and Comparative Examples. In these examples,% means% by weight unless otherwise specified.

Example 1 Commercially available polyamide-imide resin coating HI-406
Polyolefin dispersion in which a modified polyolefin, Modic L-400F (trade name, manufactured by Mitsubishi Yuka Co., Ltd.), was dispersed in (Hitachi Chemical Co., Ltd. trade name) in a xylene solvent to a concentration of 10%. The solution was added so that the resin ratio was 2%. Dispersion in a xylene solvent was performed by adding a predetermined amount of modified polyolefin to xylene heated to a reflux state, and then rapidly cooling to room temperature while performing high-speed stirring. The resin coating composition to which the polyolefin dispersion was added was sufficiently stirred to obtain a uniform resin coating solution. Furnace temperature 5
Using a hot air circulation oven at 00 ° C, a polyamide-imide resin paint HI-406 (trade name) was applied and baked on a copper wire with a conductor diameter of 1.0 mm several times, and the above-mentioned polyamide-imide resin paint HI-406 (trade name) was added. -406 (trade name) was applied and baked once to obtain a polyamide-imide resin insulated wire having a total insulating film thickness of 36 μm on one side.

Results of measuring the static friction coefficient of this insulated wire
It was 0.060, and the abrasion resistance test (according to JISC 3003) was 1830 g. The static friction coefficient was measured using the apparatus shown in FIGS. In addition, a sticking force test specified in ASTM-D 2519-1968 was performed. In the measurement of the adhesive strength of the impregnated varnish, PD-923 (trade name of PD George Co., USA) was used at a concentration of 25% as the impregnated varnish. A helical coil specified in ASTM was prepared, impregnated in the impregnated varnish for 1 minute, and then taken out. This helical coil was dried at room temperature for 1 hour, and further cured for 1 hour in a circulating constant temperature bath at 160 ° C. The helical coil created in this way is
The adhesive strength was evaluated by the method of STM-D 2519, and the result was 17.5 Kgf.

[0016]

[Comparative Example 1] On a copper wire having a conductor diameter of 1.0 mm, a commercially available polyamide-imide resin coating HI-406 (trade name) was applied and baked several times in the same manner as in Example 1, and the above-mentioned HI-406 (trade name) was used. ) Modic L-400 which is a modified polyolefin
F (trade name) was dispersed in a xylene solvent to a concentration of 10%, and a polyolefin dispersion liquid was added so that the resin ratio became 6%. The resin coating solution obtained was applied and baked once, An enamel insulated wire with a film thickness of 40 μm was obtained. The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 to be 0.058, and in the wear resistance test, it was 1900 g. The fixing force of the impregnated varnish obtained in the same manner as in Example 1 was 8.9 Kgf. Compared to Example 1, the adhesion of the impregnated varnish was a very poor result.

[0017]

[Comparative Example 2] Commercially available polyamide-imide resin coating HI-406 (trade name) was applied and baked on a copper wire having a conductor diameter of 1.0 mm several times in the same manner as in Example 1, and the above-mentioned HI-406 (trade name) was used. ) Modic L-400 which is a modified polyolefin
A polyolefin dispersion liquid in which F (trade name) is dispersed in a xylene solvent to a concentration of 10% has a resin ratio of 0.05.
%, And the resin coating solution obtained by adding so as to obtain a enamel insulated wire having a coating thickness of 40 μm was obtained. The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 to be 0.120, and in the abrasion resistance test, it was 1635 g. The fixing force of the impregnated varnish obtained in the same manner as in Example 1 was 18.0 Kgf. The coefficient of static friction was extremely poor as compared with Example 1.

[0018]

[Comparative Example 3] Commercially available polyamide-imide resin coating HI-406 (trade name) was applied several times to a copper wire having a conductor diameter of 1.0 mm and baked in the same manner as in Example 1, and baked to form an enamel insulated wire having a film thickness of 40 µm. Got The static friction coefficient of this insulated wire was 0.140, and it was 1500 g in the abrasion resistance test. The fixing force of the impregnated varnish obtained in the same manner as in Example 1 was 19.0 Kgf. The coefficient of static friction was extremely poor as compared with Example 1.

[0019]

[Example 2] On a copper wire having a conductor diameter of 1.0 mm, a commercially available polyamide-imide resin coating HI-406 (trade name) was applied and baked several times in the same manner as in Example 1, and the above-mentioned HI-406 (trade name) was used. ) Modic L-400 which is a modified polyolefin
0.5% of the resin dispersion is a polyolefin dispersion in which F (trade name) is dispersed in a xylene solvent to a concentration of 10%.
The enamel insulated wire having a film thickness of 40 μm was obtained by coating and baking the product added so that The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 and the result was 0.060.
It was 1910 g in the abrasion resistance test. Also,
The adhesive strength of the impregnated varnish obtained in the same manner as in Example 1 was 18.5 Kgf.
Met.

[0020]

[Example 3] Commercially available polyamide-imide resin coating HI-406 (trade name) was applied and baked on a copper wire having a conductor diameter of 1.0 mm several times in the same manner as in Example 1, and the above-mentioned HI-406 (trade name) was used. ) In which a modified polyolefin Modid M-200 F (trade name of Mitsubishi Petrochemical Co., Ltd.), which is a modified polyolefin different from those in Examples 1 and 2, is dispersed in a xylene solvent to a concentration of 10%. Resin with a resin ratio of 3.0% was applied and baked once to give a film thickness of 40 μm.
The enamel insulated electric wire of was obtained. The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 and the result was 0.058.
The abrasion resistance test was 2005 g. In addition, Example 1
The adhesion strength of the impregnated varnish obtained in the same manner as above was 16.0 Kgf.

[0021]

[Example 4] On a copper wire having a conductor diameter of 1.0 mm, in the same manner as in Example 1, a commercially available polyamide-imide resin coating HI-406 (trade name) was used as a modified polyolefin, Modic M-20.
A polyolefin dispersion containing 0 F (trade name) dispersed in a xylene solvent to a concentration of 10% has a resin ratio of 3.0.
% Of the additive was applied and baked several times to obtain an enamel insulated wire with a film thickness of 40 μm. The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 and the result was 0.06.
0 and the wear resistance test was 1860 g. Further, the fixing force of the impregnated varnish performed in the same manner as in Example 1 was 15.5.
It was Kgf.

[0022]

Example 5 A modified polyolefin Modic L-410C was dispersed in a commercially available polyester resin coating material E-234 (trade name, manufactured by Nitto Denko Corporation) in a xylene solvent to a concentration of 10%. The polyolefin dispersion was added so that the resin ratio was 1%. The resin paint was sufficiently stirred to obtain a uniform resin paint solution. Polyester resin paint E-234 (trade name) is applied and baked several times on a copper wire with a conductor diameter of 1.0 mm, and the polyester resin paint solution containing the above-mentioned polyolefin is applied and baked once, and the total insulation film thickness is on one side. To obtain a 30 μm polyester resin insulated wire.

The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 and found to be 0.055, and it was 1250 g in the abrasion resistance test. For the measurement of the adhesive strength of the impregnated varnish, Isopoxy 433 (trade name of Schenectady Chemical Co., USA) was used at a concentration of 25% as the impregnated varnish. AS
The helical coil specified in TM was prepared, impregnated in the impregnated varnish for 1 minute, and then taken out. This helical coil was dried at room temperature for 1 hour, and further cured for 3 hours in a circulating constant temperature bath at 150 ° C. The helical coil thus produced was evaluated by the method of ASTM-D 2519, and its adhesion was measured, and the result was 15.0 Kgf.

[0024]

Example 6 Admer NB550 which is a modified polyolefin in a commercially available polyester resin coating E-234 (trade name)
(Mitsui Petrochemical Co., Ltd. product name) in xylene solvent
The polyolefin dispersion dispersed to a concentration of 10% was added so that the resin ratio was 2.5%. The resin paint was sufficiently stirred to obtain a uniform resin paint solution. Conductor diameter 1.
Polyester resin paint E-234 (trade name) was applied and baked on a 0 mm copper wire several times in the same manner as in Example 1, and the polyester resin paint added with the above-mentioned polyolefin was applied and baked once to obtain full insulation. A polyester resin insulated wire having a film thickness of 30 μm on one side was obtained. The static friction coefficient of this insulated wire was measured in the same manner as in Example 1 and was found to be 0.040, which was 1075 g in the abrasion resistance test. The fixing force of the impregnated varnish was evaluated in the same manner as in Example 5. The result 16.
It was 5 Kgf. The results obtained in the above Examples and Comparative Examples are summarized in Table 1.

[0025]

[Table 1]

[0026]

As described above, the self-lubricating insulated wire of the present invention has excellent important characteristics and is industrially very useful.

[Brief description of drawings]

1 is a plan view of an apparatus for measuring the coefficient of static friction of an insulated wire.

2 is a side view of the device of FIG. 1. FIG.

[Explanation of symbols]

 1 Insulated wire 2 Slider 3 Load

Claims (1)

[Claims] 1. A resin coating containing 0.1 to 5.0% by weight of an acid anhydride modified polyolefin resin with respect to a base insulating resin content is applied on a conductor directly or through another insulating layer, and baked. A self-lubricating insulated wire characterized by having an insulating film.