JPH0773008B2 - Lubrication insulated wire manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an insulated wire used in a motor, a transformer, a magnetic coil, or the like.

(Prior Art and Problems Thereof) The present invention relates to a method for manufacturing a lubricated insulated wire having excellent winding properties.

In recent years, in electrical equipment manufacturers using enamel wire,
High-speed automatic winding machines have come to be used in order to speed up the manufacturing process of equipment. However, in this case, although it seems that the processing cost of the equipment could be remarkably reduced by speeding up the process, the enamel wire is actually subjected to friction during the winding process, and the insulating layer is mechanically damaged.
For this reason, there is a big problem that the loss rate is greatly increased by causing a rare short after being incorporated in a device. In order to solve this, it has been attempted to impart lubricity to the enamel wire to reduce mechanical damage. This applies not only to the automatic winding machine but also to manual work. For example, when inserting an enamel wire into a narrow slot of a motor, there is a demand for an enamel wire having good slipperiness in order to improve the efficiency of manual work.

Since the enameled wire itself has poor lubricity, slippage between the enameled wires, between the enameled wire and the winding machine, between the enameled wire and the equipment, etc. is bad, and the insulation layer is damaged or the work efficiency is deteriorated. For this reason, a method of applying a liquid lubricant such as fluid paraffin or refrigerating machine oil onto the enamel wire has been adopted, but the liquid lubricant does not have sufficient lubricity and slipperiness, so it is difficult to separate the wire manually. However, there is a problem in that the winding property of the transformer, the coil, etc. is poor at the time of winding. Further, the number of layers is increasing due to the recent trend of high-speed winding and the expansion of space factor inserter system.

Lubricants capable of imparting sufficient lubricity and slipperiness to insulated wires include, for example, solid paraffin, microcrystalline wax, polyethylene, and fluororesin (JP-A-60-158507). However, since it is solid at room temperature, there are many problems in the method of applying it to the insulated wire.

For example, fixed paraffin, microcrystalline wax, etc. that become liquid when heated can be heated and melted to be applied on the insulated wire, but in this case, a device for heating and melting is required and the amount of application is If the number is large, there is a drawback that the insulated electric wires are fixed to each other in the reel after the insulated electric wires are wound on the reel.

There is also a method of using a lubricant composed of liquid paraffin and natural wax (JP-A-60-158507). However, since this lubricant is solid at room temperature, it needs to be melted by heating in the same manner as described above, and then applied to the surface of the electric wire. Further, baking is performed after application.

Further, a method of dissolving solid paraffin or the like in an organic solvent and coating / drying it, or a method of coating / drying an aliphatic hydrocarbon or aromatic hydrocarbon solution or suspension of polyethylene (JP-A-47-33712) is also available. However, in this case, a furnace for drying the solvent and an exhaust system are required, and most of the organic solvent is lost because it is dissolved in only a few% in the organic solvent, which increases the cost accordingly.

More recently, a method of dispersing polyethylene or fluorine resin in the form of fine particles into a varnish and then coating and baking the insulated wire (Japanese Patent Laid-Open No. 49-41868) has been attempted. It is difficult to use because the varnish is unstable because the fine particles of polyethylene and fluorine resin in the inside cause precipitation, floating, and aggregation.

As described above, the method of applying a solid lubricant capable of imparting sufficient lubricity and slipperiness to an insulated wire to the insulated wire is unprecedented, and it is the current situation.

The inventors of the present invention have arrived at the method of the present invention as a result of intensive studies on solving these problems.

Since the organic lubricant of the present invention is liquid at room temperature, it can be easily applied to an electric wire, and since the organic lubricant containing an excellent lubricity is contained, the obtained insulated electric wire has good lubricity.

(Structure of the Invention) The present invention is characterized in that an organic lubricant that is solid at room temperature and has a main chain carbon number of 21 or more is dispersed in an organic lubricant that is liquid at room temperature and is applied onto an insulated wire. It is a method of manufacturing an electric wire.

The organic lubricant which is solid at room temperature and has a main chain carbon number of 21 or more according to the present invention may be any one that can be dispersed in an organic lubricant that is liquid at room temperature.

It is necessary that the main chain has 21 or more carbon atoms, because the main chain having 20 or less carbon atoms has insufficient lubricity.

Examples of the organic lubricant having a main chain of 21 or more carbon atoms and solid at room temperature include, for example, polyolefin such as low density polyethylene, high density polyethylene, medium density polyethylene, polypropylene, polybutylene, polymethylpentene, and ethylene-propylene copolymer. , Polytetrafluoroethylene, Tetrafluoroethylene-hexafluoropropylene copolymer, Polychlorotrifluoroethylene, Tetrafluoroethylene-ethylene copolymer, Polyvinylidenefluoride and other fluorine resins, Solid paraffin, Microcrystalline wax , Carnauba wax, beeswax, montan wax, ozokerite, ceresin, wood wax, candelilla wax, sera crow, whale wax, waxes such as lanolin, and their derivatives.

Of course, it is also possible to use two or more kinds of the above lubricants as a mixture. Of these, polyolefin and fluorine resins are preferable because they are easily dispersed in an organic lubricant that is liquid at room temperature and fine particles are easily available. Addition amount of organic lubricant that is solid at room temperature is 25% by weight to organic lubricant that is liquid at room temperature
The following are preferred. If it is more than that, the fluidity becomes poor and it becomes difficult to apply it to the insulated wire. Any organic lubricant that is liquid at room temperature can be used as long as it can be normally used for insulated wires.

Specific examples include fluid paraffin, spindle oil,
There are velosite, refrigerating machine oil, machine oil, etc. It is also possible to mix and use two or more kinds.

In the present invention, it is important to disperse an organic lubricant which has a main chain of 21 or more carbon atoms and is solid at room temperature into an organic lubricant which is liquid at room temperature.

When an organic lubricant that is solid at room temperature and has 20 or more carbon atoms in its main chain is dispersed in an organic lubricant that is liquid at room temperature, the finished lubricant will have the same viscosity as the organic lubricant that is liquid at room temperature. It is possible to easily apply it on the insulated wire as in the case of using an organic lubricant which is liquid at room temperature without much difference. However, if an organic lubricant that is solid at room temperature and has 20 or more carbon atoms in its main chain is dissolved in an organic lubricant that is liquid at room temperature, the resulting lubricant will increase in viscosity or become solid, making it easy. This is because it becomes impossible to apply it on the insulated wire and it is unavoidable to use it by heating or dissolving it in a solvent.

As a method of dispersing an organic lubricant that is solid at room temperature and has a carbon number of 21 or more in the main chain into an organic lubricant that is liquid at room temperature, fine particles of an organic lubricant that is solid at room temperature Method of mixing with organic lubricant, method of mixing organic lubricant that is solid at room temperature in a solvent, mixing with organic lubricant that is liquid at room temperature, liquid of solid lubricant at room temperature, then liquid at room temperature There is a method of pouring into the organic lubricant and precipitation. However, any method can be used as long as it can be uniformly dispersed.

In order to make the dispersed state uniform and stable, a surfactant,
Of course, it is possible to add an anti-agglomeration agent, a defoaming agent, a leveling agent, an anti-settling agent, a wetting agent, a dispersant, etc., if necessary.

The insulated wire used in the present invention may be any round wire or rectangular wire, regardless of the size of the conductor, the type and configuration of the insulating layer, and the presence or absence of the self-fusing layer.

The method of applying the lubricant of the present invention may be any method.

For example, by using the dipping method, the groove roller method, the wiper roller method, etc., after passing the insulated wire in the lubricating oil, squeezing it with a felt, or letting the lubricant soak into the felt, the insulated wire is placed on or between the felt. There is a method of passing and applying.

The contents of the present invention will be described in the following examples, but the present invention is not limited to the following examples.

In the characteristics of the examples, the coefficient of static friction was determined by mounting two sample electric wires in parallel on a metal block and placing each of them on a flat surface with two right angled wires. It is the value of the friction coefficient between lines measured by placing the load on the tip of the former. The dynamic friction coefficient is a friction coefficient value measured by running a wire in contact with a sapphire block using a measuring machine manufactured by Indiana Institute of Technology.

Comparative Example 1 Delacoat E220G (polyester insulating paint manufactured by Nitto Denki Kogyo Co., Ltd.) was repeatedly applied and baked on a copper wire having a diameter of 0.70 mmφ several times, and then fluidized paraffin (one reagent) was applied using a felt.

The film thickness of the obtained polyester wire was 0.027 mm.

(Examples 1 and 2) Instead of the fluid paraffin, the fluid paraffin has a particle size of 5 to 5.
A polyester wire was obtained in the same manner as in Comparative Example 1 using 5% by weight (Example 1) and 15% by weight (Example 2) of 25 micron polyethylene fine particles dispersed therein.

(Example 3) Instead of the fluidized paraffin, the fluidized paraffin has a particle size of 0.
A polyester wire was obtained in the same manner as in Comparative Example 1 using 5% by weight of polytetrafluoroethylene fine particles of 2 to 2 microns dispersed.

(Example 4) The static friction coefficient of the polyester wires of Comparative Example 1 and Examples 1 to 3 was measured by the method described above. The results are shown in Table 1.

(Example 5) The dynamic friction coefficients of the polyester wires of Comparative Examples 1 and 1 to 3 were measured by the above-described dynamic friction coefficient measuring device. The results are shown in Table 1.

(Effect of the Invention) As described above, as shown in the Examples, a lubricant obtained by dispersing an organic lubricant which is solid at room temperature and has 21 or more carbon atoms in the main chain in an organic lubricant which is liquid at room temperature is used. When used, unlike a lubricant which becomes solid at room temperature, it is not necessary to heat and melt it at the time of application, and since the lubricant particles which are solid at room temperature are dispersed, the application thickness can be made constant. Furthermore, since baking after application is not necessary, manufacturing of the lubricity insulated wire is easy. Moreover, it is possible to obtain a product with excellent lubricity,
Its industrial value is great.

Claims (4)

[Claims] 1. An organic lubricant which is solid at room temperature and has a main chain carbon number of 21 or more is 25% by weight based on an organic lubricant which is liquid at room temperature.
A method for producing a lubricated insulated electric wire, comprising the steps of adding, dispersing, and coating on an insulated electric wire. 2. The method for producing a lubricated insulated wire according to claim 1, wherein the organic lubricant that is solid at room temperature is a polyolefin organic lubricant. 3. The method for producing a lubricated insulated wire according to claim 2, wherein the organic lubricant which is solid at room temperature is polyethylene. 4. The method for producing a lubricated insulated wire according to claim 1, wherein the organic lubricant which is solid at room temperature is a fluororesin.