JPH038215A - Lubricating enameled wire and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve slipperiness by hot-melt coating the external circumference of enameled wire with lubricating oil blended with a specified quantity of natural wax. CONSTITUTION:Lubricating oil at 100 parts by weight blended with natural wax at 2-80 parts by weight is hot-melt coated to the external circumference of enameled wire. Natural wax at less than 2 parts by weight cannot have an effect on slipperiness of the external circumference of enameled wire, and in case natural wax is at more than 80 parts by weight, the coating of the lubricating layer becomes uneven, or the adhesive property to electrical insulation varnish deteriorates. Accordingly, the natural wax within a range from 2 parts to 8 parts by weight can prevent aged deterioration of slipperiness and also the lubricating oil and the natural wax synergetically act with the result that the slipperiness improves. Moreover, the quantity of the film of natural-wax-blended lubricating oil formed at the external circumference of the enameled wire should be 0.00001-0.001g/cm<2> and the natural wax, hot-melt coated at a temperature higher than a melting point of natural wax.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lubricious enamelled wire and a method for manufacturing the same. More specifically, the present invention relates to a lubricious enamelled wire that exhibits excellent slipperiness when wound into an electrical equipment coil, and a method for manufacturing the same.

[Prior Art] Enamelled wire is widely used as a coil winding material for motors and transformers.

Coil winding work for these general-purpose electrical devices is usually performed using a coil winding machine. These coil winding machines have many guide members, etc., and the enamelled wire is required to be able to pass smoothly through these guide members at high speed without being damaged. Lubricious enameled wire is an enameled wire that meets these demands.

Lubricating enameled wires include those in which a lubricating solid polymer film, such as a polyethylene resin film, polypropylene resin film, silicone resin film, etc., is formed on the outer periphery of the enameled wire, and those in which lubricating oil is simply applied to the outer periphery of the enameled wire. There is.

L Problems to be Solved by the Invention] However, in the case of a lubricating enameled wire in which a lubricating solid polymer film is formed on the outer periphery of the enameled wire, the film thickness is naturally increased by the amount of the lubricating solid polymer film, and as a result, the enamelled wire becomes thicker due to the lubricating solid polymer film. The problem is that the outer diameter of the wire is thick. Electrical equipment coils wound with enamelled wire having a large outer diameter have the disadvantage of being large in size.

On the other hand, a lubricating enameled wire simply coated with lubricating oil is essentially inferior in improving slipperiness than a solid polymer lubricating layer coating.
Moreover, the lubricating oil falls off over time, causing a change in slipperiness over time, which is a disadvantage.

The present invention has been made based on this point, and its purpose is to eliminate the drawbacks of the prior art described above,
It is an object of the present invention to provide a lubricating enameled wire whose slipperiness does not change over time and whose slipperiness is extremely excellent, and a method for manufacturing the same.

[Means for Solving the Problems] The gist of the present invention is to melt a natural wax blend lubricating oil prepared by blending 2 to 80 parts by weight of natural wax with 100 parts by weight of the lubricating oil onto the outer periphery of an enameled wire. The present invention relates to a lubricious enameled wire obtained by coating and a method for manufacturing the same.

In the present invention, any mineral oil or vegetable oil can be used as the lubricating oil, but liquid paraffin is preferred from the viewpoint of compatibility with natural waxes, melt coating properties, resistance to oxidative deterioration, etc. In addition, as liquid paraffin, 20℃
It is desirable that the viscosity is in the 55 cp to 350 cp class. In this case, low-viscosity liquid paraffin is used for thin enameled wires, and high-viscosity liquid paraffin is used for large-sized enameled wires.

In the present invention, natural waxes include beeswax, carnauba wax, lanolin (wool fat), and the like. One type of these natural waxes may be used, but 2.3 types may be blended. These blends lower the melting point of the natural wax, thereby making it possible to perform low-temperature melt coating, as well as preventing oxidative deterioration of the natural wax and effectively improving its slipperiness.

In the natural wax blend lubricating oil of the present invention, the blending ratio of natural wax to ioomi part of lubricating oil is 2 to 2.
The reason for limiting the amount to 80 parts by weight is that if the natural wax is less than 2 parts by weight, no significant effect on slipping properties can be achieved, and on the other hand, if the natural wax is more than 80 parts by weight, the compatibility with lubricating oil will decrease rapidly. This is because uneven coating of the lubricant layer occurs and the adhesion with the electrical insulation face deteriorates.

In the present invention, the amount of natural wax blend lubricating oil applied to the outer circumference of the enameled wire is o, ooooi ~ ~ 0.0
The reason for limiting it to 0.01g/cd (outer peripheral surface area of the enameled wire) is that 0.00001g/cd or less (outer peripheral surface area of the enameled wire) has no effect on improving the slipperiness of the enameled wire; This is because there is no effect of improving slipperiness in proportion to the amount blended (outer peripheral surface area of the enameled wire), and furthermore, the blended natural wax significantly inhibits adhesion to the electrical insulation board.

In the present invention, when applying the natural wax blend lubricating oil to the outer periphery of the enameled wire, it is appropriate that the temperature of the natural wax blend lubricating oil be slightly higher than the melting point of the blended natural wax, for example, 7 to 35°C higher than the melting point. .

That is, if the temperature of the natural wax blend lubricating oil is too low, the compatibility of these two components will be poor, and as a result, the effect of significantly improving slipperiness will not be exhibited. Conversely, if the temperature of the natural wax blend lubricating oil is too high, thermal deterioration of the natural wax will occur, and the effect of significantly improving slipperiness will not be exhibited.

The melting point of these natural waxes depends on the brand, but
Most are 50-70'C.

[Function] The lubricating enameled wire of the present invention is made by melt-coating a natural wax blend lubricating oil on the outer periphery of the enameled wire, thereby suppressing changes in slipperiness over time and allowing the lubricating oil and natural wax to act synergistically to improve slippage. This is due to the remarkable improvement in performance.

That is, the lubricating enameled wire of the present invention is made by blending a natural wax that is solid at room temperature into a lubricating oil that is liquid at room temperature, and melting and coating the natural wax blend lubricating oil on the outer periphery of the enameled wire. The objective is to synergistically improve slippage by interacting the lubricating oil and the solid natural wax. In other words, when the lubricant enameled wire of the present invention passes through the guide of the winding machine at low speed, the lubricating oil and the solid natural wax mutually slide to improve the sliding property, and the lubricant enameled wire passes through the guide of the winding machine at low speed. When passing at high speed, it melts with heat and exhibits excellent slipperiness, and both of these effectively reduce the impact of collision with the winding machine guide, preventing damage to the enamelled wire, resulting in excellent electrical insulation. This makes it possible to produce coils for electrical equipment.

In addition, in the present invention, the amount of natural wax blend lubricating oil is 2 to 2 to 100 parts by weight of lubricating oil.
The amount of natural wax blend lubricating oil applied to the outer periphery of the enameled wire is limited to 80 parts by weight and is 0.00001 to 0.
．． 001 g/d (the outer peripheral surface area of the enameled wire), the appearance of the lubricating layer melt-coated on the outer periphery of the enameled wire is improved and the commercial value is increased. This strengthens the adhesion of the adhesive.

[Example] Next, an example of the lubricating enamelled wire of the present invention will be described together with a conventional comparative example.

Table 1 shows the test results of examples of the lubricating enamelled wire of the present invention and conventional comparative examples.

The base enamelled wire used in Table 1 has a conductor diameter of 1.0
It is a polyester enameled wire with a diameter of 0.00 mm and a coating thickness of 0.038 mm.

The amount of natural wax blend lubricating oil applied was obtained by weighing a predetermined length of enameled wire before and after painting on a chemical balance, and dividing the weight difference by the surface area of the enameled wire.

The static friction coefficient was measured by the wire-and-wire method (test method for static friction coefficient between enameled wires).

To determine the adhesion to the electrically insulating varnish, first prepare two lubricating enamelled wires and use them to twist two pieces as specified in JIS-C-3003 to form a sample piece. Next, the two stranded sample pieces are dipped in unsaturated polyester varnish, taken out, and then dried at 120° C. for 1 hour to obtain an adhesion test sample piece. Next, the two lubricant enameled wires of the adhesion test specimen treated with this unsaturated polyester varnish were pulled in opposite directions, and the pullout load at that time was measured. 2
Items weighing less than 1 kg are marked with an X.

In addition, liquid paraffin has a viscosity of 120c at 20°C.
p, and beeswax has a melting point of 65°C.

71 As is clear from Table 1, the conventional lubricating enamelled wire of Comparative Example 1 coated only with liquid paraffin had a very small effect of improving slipperiness.

The lubricating enameled wire of Comparative Example 2, in which a natural wax blend lubricating oil prepared by blending 100 parts by weight of liquid paraffin with 1 part by weight of beeswax, was melt-coated on the outer periphery of the enameled wire, and the effect of improving slipperiness was very small.

On the other hand, the lubricating enameled wire of Comparative Example 3, in which a natural wax blend lubricating oil made by blending 100 parts by weight of liquid paraffin with 85 parts by weight of beeswax, was melt-coated on the outer periphery of the enameled wire also had a very large effect of improving slipperiness. , the adhesion with electrical insulating varnish is extremely poor.

In addition, the lubricating enameled wire of Comparative Example 4, in which a natural wax blend lubricating oil made by blending 100 parts by weight of liquid paraffin and 30 parts by weight of beeswax, was melt-coated on the outer periphery of the enameled wire had poor slipperiness because the applied amount was too small. The improvement effect is very small. On the contrary, the lubricating enameled wire of Comparative Example 5, in which a natural wax blend lubricating oil made by blending 100 parts by weight of liquid paraffin with 30 parts by weight of beeswax, was melt-coated on the outer periphery of the enameled wire, which had a very large effect of improving slipperiness. However, because the amount applied is too large, the adhesion with the electrically insulating varnish is extremely poor.

In contrast, the lubricating enamelled wires of Examples 1 to 7 of the present invention showed excellent results in both slipperiness and adhesion to electrically insulating varnish.

[Effects of the Invention] The lubricating enamelled wire of the present invention maintains excellent slip properties and does not change over time, and also has excellent damage prevention properties when winding coils of electrical equipment. Unlike a lubricating enameled wire on which a lubricating solid polymer film is formed, there is no increase in the outer diameter of the enameled wire, and it is industrially useful.

Claims (1)

[Claims] 1. 2 to 8 parts of natural wax per 100 parts by weight of lubricating oil.
A lubricating enameled wire characterized in that a film of a natural wax blend lubricating oil blended with 0 parts by weight is formed on the outer periphery of the enameled wire. 2. The amount of the natural wax blend lubricating oil film formed on the outer periphery of the enameled wire is 0.00001 to 0.001 g/c
A lubricating enameled wire characterized by having a surface area of m^2 (outer peripheral surface area of the enameled wire). 3. A natural wax blend lubricating oil prepared by blending 2 to 80 parts by weight of a natural wax that is solid at room temperature with 100 parts by weight of a lubricating oil that is liquid at room temperature is applied to the outer periphery of an enameled wire at a temperature higher than the melting point of the natural wax. A method for producing a lubricating enameled wire, which comprises melt-painting the wire thereon.