JPS58186107A - Lubricating insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricious insulated wire with excellent windability.

In recent years, electronics manufacturers and the like that use enameled wire have begun to use high-speed automatic wire winding machines in order to speed up the manufacturing process of devices. However, in this case, although it appears that the processing cost of the equipment has been significantly reduced by speeding up the process, in reality, the enamelled wire is subject to friction during winding, resulting in mechanical damage to the insulating layer. For this reason, after being incorporated into a device, a layer short circuit occurs and the loss rate increases significantly, which is a major problem. To solve this problem, attempts have been made to provide lubricity to the enameled wire to reduce mechanical damage. This is true not only for automatic winding machines but also for manual winding. For example, when inserting enameled wire into a narrow slot of a motor, there is a demand for enameled wire with good sliding properties in order to improve manual efficiency. Since enameled wire itself has poor lubricity, slippage between enamelled wires, between enameled wires and winding machines, between enameled wires and equipment, etc. is poor, resulting in damage to the insulating layer and poor working efficiency. For this reason, a method has been adopted in which a liquid lubricant such as liquid paraffin or refrigerating machine oil is applied onto the enameled wire. However, this method has lubricity and
Due to insufficient slipperiness, wire handling is difficult when done manually, and when winding, there are problems in that the alignment of transformer coils, etc. is poor. Rare shorts are increasing due to the expansion of application. In addition, this method uses a liquid lubricant, which not only makes it easy for dust to adhere to the wire, but also prevents the wire from coming apart after winding the coil, and the adhesive strength of the adhesive tape used to secure the ends. Another disadvantage is that the tape tends to peel off easily.

To solve this problem, electrical manufacturers that wind coils sometimes use a method of passing the wire over chunks of solid paraffin and rubbing the solid paraffin on the wire surface, but the amount of adhesion is uneven and the amount of adhesion is uneven. Generally, there are too many wires, the wires quickly dig into the solid paraffin and must be replaced each time, and the process of melting and then solidifying is often repeated to regenerate the bulk, reducing work efficiency. There are strong demands for electric wire manufacturers to carry out lubrication treatment according to the purpose and size, and to change the type and amount of lubricant according to the purpose, size, etc.

In order to meet this demand, electric wire manufacturers have recently adopted a method of heating and melting a solid organic lubricant at room temperature and applying it onto the enameled wire. As the solid organic lubricant, various solid paraffins, solid higher fatty acid derivatives, and higher alcohol derivatives are used alone or in combination of two or more thereof.

However, although various solid organic lubricants have been used in combination with this method and solid organic lubricants,
There is a problem in that the adhesion to the surface of the insulated wire is large and the slipperiness is greatly affected by the outside temperature, so the slipperiness of the insulated wire becomes uneven and it is difficult to wind the coil.

In view of the above-mentioned circumstances, the present inventors have arrived at the present invention as a result of intensive research into solving these problems. That is, the present invention provides an insulated wire coated with a lubricant consisting of a mixture of an organic lubricant that is solid at room temperature and an organic lubricant that is liquid.

Examples of organic lubricants that are liquid at room temperature that can be used in the present invention include liquid paraffin, machine oil, and chlorinated paraffin. Among these, aliphatic hydrocarbons (carbon number n≧12) that are liquid at room temperature are better from the viewpoint of electrical insulation and stability, and have a kinematic viscosity (378°C) of t o cst (centistokes) or more and 200 cst or less. Preferably, the range is .

If it is less than 1 oc:::;, the uniform coating effect during the application of the lubricant will be reduced, and if it is more than 200 C9t, it is not preferable because it tends to stick to the coated insulated wire.

Examples of the lubricant that is solid at room temperature used in the present invention include solid paraffin and higher fatty acid derivatives.

Solid rough-in is commercially available as so-called solid paraffin or paraffin wax. Examples of higher fatty acid derivatives include stearic acid amide, montanic acid ester, ethylene bisstearylamide, oleic acid amide, glycerin tristearate, glycerin tristearate, stearyl stearate, and octyl palmitate. It is preferable to mix two or more types of solid lubricants with different melting points, especially those with a melting point of 45 to 60°
The combination of solid paraffin (C) and montanic acid ester wax having a melting point of 70 to 90°C is excellent in terms of electrical insulation, viscosity stability when melted, and slipperiness.

As solid paraffin, rough-in waxes with various melting points are commercially available, and all of these can be used as described above, but those with a melting point of 45°C or higher and 60°C or lower are particularly desirable. If the temperature is lower than 60°C, the slipperiness will be extremely low when the ambient temperature is high.If the temperature exceeds 60°C, the uniformity of f and f adhesion during application will decrease, and uneven adhesion will likely occur.Montanic acid ester Wax is an ester compound made by pasting montanic acid, and examples include "Hoechst Wax ○P" and "Hoechst Wax F" sold by Hoechst Japan Co., Ltd., but "Hoechst Wax E ('
M point 79~85°C1 Moncnic acid ester wax)
is the best option.

Regarding the composition of the lubricant, liquid paraffin is 30~
Although it can be used in a range of 70% by weight, a range of 30 to 60% by weight is preferred. When the amount of liquid paraffin added increases, the slipperiness decreases, and conversely, when the amount of liquid paraffin decreases, the uniform adhesion during coating decreases. Solid paraffin can be used in a range of 50 to 15% by weight, preferably 40 to 20% by weight.

When the amount of solid paraffin is increased, the uniform adhesion during coating decreases, and when the amount is decreased, the slipperiness decreases. Montanic acid ester wax can also be used in a range of 50 to 15% by weight, but preferably in a range of 40 to 20% by weight. When the amount of montanic acid ester wax added increases, it tends to stick, and when it decreases, the slipperiness decreases when the ambient temperature becomes high.

When applying lubricant to insulated wires, it is possible to dissolve the lubricant in an appropriate solvent, apply it to the wire surface, and dry it.
A method of applying a heated and melted lubricant is preferred. Methods for applying the heated and melted lubricant include a dipping method in which an insulated wire is passed directly through the heated and melted lubricant, a one-way roller method, and one-way wiper roller method.

Alternatively, the lubricant may be applied by impregnating the felt with a heated and molten lubricant and passing it over or between the felt. In this case, it is also possible to have the felt serve both as coating and squeezing. Of course, the above coating methods can also be combined.

According to the present invention, by using a lubricant made of a mixture of an organic lubricant that is solid at room temperature and an organic lubricant that is liquid, the amount of lubricant applied can be easily made uniform, and the temperature dependence of slipperiness can be reduced. Therefore, an insulated wire with stable sliding properties can be obtained. Furthermore, in the present invention, by using a lubricant consisting of a liquid organic lubricant and a solid organic lubricant at room temperature, it has better slipperiness than when only a liquid lubricant is used, and dirt does not adhere to the wire. It also reduces unevenness of application. On the other hand, compared to when only a solid lubricant is used, the softening temperature of the lubricant is lower, so the melting temperature can be lowered, and the temperature change of the viscosity during melting is smaller, so the temperature control period of the coating equipment is wider. It has the advantage of being easier to apply uniformly.

The slipperiness of an insulated wire coated with only solid lubricant is
When the applied amount is large or when the external ambient temperature is near the melting point, a tendency to stick appears and the slipperiness is significantly reduced. However, when using the lubricant of the present invention, the tendency to stick due to the lubricant components that are liquid at room temperature can be avoided. The combination of solid lubricants with different relaxation effects and melting points reduces the variation in slipperiness due to temperature changes, and the coil winding temperature for electrical equipment manufacturers is 5.
In the range of .degree. C. to 35.degree. C., changes in slipperiness can be reduced to a practically negligible extent. That is, the lubricious insulated wire of the present invention has the advantage that it is easy to apply a lubricant and has stable sliding properties.

Hereinafter, the content of the present invention will be explained in more detail based on Examples.

In addition, in the characteristics of the examples, the coefficient of static friction is measured as the coefficient of friction between lines, and the measurement method is to attach two sample lines in parallel to a metal block with a mass of 200q, and then attach them to the plane of an inclined plate held horizontally. Place the sample on two parallel sample lines so that each line makes a right angle. Sound the buzzer and gradually tilt the board while shaking it. The coefficient of static friction was determined from the inclination angle when the metal block started sliding.

The wire handling property was determined by a sensory test in which the wire was picked up from a cigarette, the wire was handled by the touch, and the slipperiness was checked.

The uniform adhesion of the coating agent was determined by observing the surface of the line with the naked eye and checking for unevenness in the amount of coating.

Example 1.2i Control Example 1.2.3.4 Diameter 0.4 On+No.
220G (Polyester insulation paint manufactured by Nichisuka Denki Chogyo Co., Ltd.)
By repeating coating and baking J several times, an insulated wire having a JIS standard type 1 structure was created. A lubricant having the composition shown in Table 1 was melted thereon by heating at 90°C, applied in an appropriate amount with a grooved roller, and drawn with felt heated to 100°C to obtain a lubricating insulated wire. Table 1 shows the properties of the obtained lubricious insulated wire.

Example 3.4.5; Comparative Example 5 A lubricant insulated wire was obtained in the same manner as in Example 1.2, except that the lubricant having the composition shown in Table 2 was used.

Table 2 shows the properties of the obtained lubricious insulated wire.

Example 6.7 Comparative Example 6 A lubricant with the composition shown in Table 2 was used, and the rotation speed of the grooved roller was changed to 0.5 times and 1.5 times the standard, and the amount of lubricant applied was intentionally adjusted. Example 1 except that it was changed to
．． A lubricious insulated wire was obtained in the same manner as in 2.

Table 3 shows the properties of the obtained lubricious insulated wire.

Claims (1)

[Claims] 1. A lubricating insulated wire coated with a lubricant consisting of a mixture of an organic lubricant that is solid and an organic lubricant that is liquid at room temperature. 2 A lubricant made by melt-mixing solid paraffin with a melting point of 45 to 60'C and montan acid ester wax with a melting point of 70 to 90°C as a solid lubricant and a liquid hydrocarbon lubricant as a liquid lubricant. The lubricious insulated wire according to claim 1, characterized in that the wire is coated with a lubricious insulated wire. 3. 50-15% by weight of solid paraffin, 50-15% by weight of Montanic acid ester straw, and 30% by weight of liquid paraffin
The lubricious insulation "East wire" according to claim 1 or 2, characterized in that a lubricant containing a mixture of 70% by weight is used.