JP3310419B2 - Self-lubricating insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire used for a coil molded product of an electric device, and more particularly, to a self-lubricating insulated wire having improved surface slipperiness and improved winding workability. .

[0002]

2. Description of the Related Art In recent years, miniaturization, high performance, and low cost of electric devices such as motors and transformers have been promoted, and accordingly, insulated wires used for coil-formed products of such electric devices have become high speed and high speed. It tends to be coiled at high density. For this reason, even if the coil winding operation is performed at a high speed on the insulated wire used for such an application, the coating is not damaged or the characteristics are not deteriorated, and the space factor in the slot can be increased. In addition, there is a strong demand for improvement in the slipperiness of the coating surface.

[0003] Conventionally, such a method for improving the slipperiness is as follows: a) Insulating paint, lubricating oils such as montanic acid wax, carnauba wax, paraffin wax, silicone oil, etc .; Add powder such as fluororesin, polyethylene, polypropylene, etc. b) Cover the wire surface with a highly lubricating nylon resin or a nylon resin added with the above-mentioned lubricating substance. C) Cover the wire surface with shellac And an alkaline water dispersion of a lubricating material such as carnauba wax or the like, and baking them. D) Applying a lubricating oil such as liquid paraffin or spindle oil to the electric wire surface.

However, such a method has the following problems. That is, in the method (a), a large amount of a lubricating substance must be blended in order to improve the lubricating property, and therefore, the transparency of the coating film may be lost, or the coating may be separated or precipitated. . In addition, sufficient slip properties cannot be obtained. Further, when the lubricating substance is a powdery substance, not only does the surface of the coating become rough, resulting in poor appearance, but also a so-called repelling phenomenon (a phenomenon in which the varnish is repelled when treated with an impregnating varnish after winding the coil). According to the method (b), the softening temperature is lowered, and the same problem as described above occurs when a lubricating substance is added. Further, the film thickness increases, which is not preferable in terms of the space factor.

In the method (c), there is a possibility that a trouble such as disconnection may occur during coil processing.

In the method (2), it is difficult to apply the composition uniformly, and the slipperiness is insufficient.

Further, in the methods (b) to (d), after the paint is baked, it is necessary to perform the application and baking steps again, so that the workability is reduced and the production cost is increased.

[0008]

As described above, in the insulated wire, there is a demand for an improvement in the slipperiness in order to enhance the winding workability. There have been drawbacks such as the occurrence of repelling phenomena repelling varnishes, impairing properties such as heat resistance and electrical properties, poor appearance, reduced workability, and increased manufacturing costs.

The present invention has been made in view of such a conventional situation, and has improved slipperiness and a repelling phenomenon.
It is an object of the present invention to provide a self-lubricating insulated wire that does not cause deterioration in characteristics such as heat resistance and electrical characteristics, poor appearance, and is easy to manufacture.

[0010]

The inventors of the present invention have conducted intensive studies to obtain such a self-lubricating insulated wire, and as a result,
Among the amino acids and phosphate esters, those having a relatively large molecular weight are effective for improving the slipperiness of the film, and it has been found that the above objects can be achieved by using an insulating paint containing these compounds. Was completed.

That is, the self-lubricating insulated wire of the present invention comprises: (a) a carbon number in a molecule per 100 parts by weight of a resin for forming a baked coating film, directly on a conductor or through another insulating coating;
Coating and baking layer of an insulating paint comprising 0.05 to 15 parts by weight of an amino acid having 11 or more hydrocarbon groups or a derivative thereof and / or (b) a phosphoric acid ester having a hydrocarbon group having 11 or more carbon atoms in a molecule. Is provided.

The insulating coating used in the present invention is generally a coating for forming an insulating coating, such as formal, polyester, polyesterimide, polyurethane, polyamideimide, polyimide, nylon, or a mixture thereof. All insulating coatings known as are applicable.

In the present invention, such insulating coatings may be used in such insulating paints as (a) an amino acid or a derivative thereof having a hydrocarbon group having 11 or more carbon atoms in the molecule and / or (b) a hydrocarbon having 11 or more carbon atoms in the molecule. A phosphate ester having a group is added. These components have the effect of imparting excellent slip properties to the coating without impairing the inherent properties of the insulating paint, and improving the winding workability of the resulting insulated wire.
Preferred examples of the amino acid having a hydrocarbon group having 11 or more carbon atoms in the molecule of the component (a) or a derivative thereof include N-lauroyl L-lysine [C ₁₁ H ₂₃ CONH (CH ₂ ) ₄ CH
(NH ₂ ) COOH], N-lauroyl aspartic acid β-lauryl ester [C ₁₂ H ₂₅ NHCH (CH ₂ COOC ₁₂ H ₂₅ ) COOH], N-stearyl aspartic acid β-stearyl ester [C ₁₈ H
₃₇ NHCH (CH ₂ COOC ₁₈ H ₃₇ ) COOH]. Preferred examples of the phosphoric ester having a hydrocarbon group having 11 or more carbon atoms in the molecule of the component (b) include distearyl phosphate [PO (OC ₁₈ H ₃₇ ) ₂ (OH)]. And so on. As an example of a commercially available product, N-lauroyl L-lysine is N-lauroyl aspartic acid β-lauryl ester as trade name Famex L-12, and N-stearyl aspartic acid β- lauryl ester is trade name Famex A-12. Stearyl ester is trade name Famex A
As -18, distearyl phosphate is marketed by Ajinomoto Co. under the trade name Famex P-18. These components may be used alone or in a combination of two or more.

In the present invention, such (a)
The amount of the component (A) and / or the component (B) in the insulating paint is adjusted to 0.05 parts per 100 parts by weight of the resin for forming a baked film.
The reason for limiting to 15 parts by weight is that if these components are less than 0.05 parts by weight, the effect of improving slipperiness is small, and if they exceed 15 parts by weight, corrugated irregularities are generated on the coating surface, and thermal softening is also caused. This is because the temperature may decrease. A more preferred range is per 100 parts by weight of the resin for forming a baked film,
0.5 to 10 parts by weight.

[0015] The self-lubricating insulated wire of the present invention is obtained by applying an insulating paint containing the component (a) and / or the component (b) in the above-mentioned range on a conductor directly or through another insulating coating. The self-lubricating insulated wire obtained by baking is an amino acid having a hydrocarbon group having 11 or more carbon atoms in the molecule of (A) or a derivative thereof and / or (B) having 11 or more carbon atoms in the molecule. As a result of the action of the phosphoric acid ester having a hydrocarbon group, an insulating film having excellent slipperiness is formed, so that the coil can be wound with good winding workability, that is, at high speed and high density. Moreover,
The component (a) and the component (b) may cause repelling phenomena repelling the varnish for impregnation, inferior properties such as heat resistance and electrical properties, and inconvenience such as poor appearance due to the combination of these components. Since there is no insulated wire, the insulated wire obtained is at least comparable to the conventional insulated wire with respect to other characteristics, and has greatly improved slipperiness. In addition, as described above, no new coating or baking step is required for manufacturing, so that workability is not reduced and manufacturing cost is not increased.

Since the self-fusing insulated wire of the present invention has excellent characteristics such as excellent slipperiness and no repelling phenomenon, it is possible to reduce the size of electric devices such as motors and transformers in recent years. It is very useful for improving performance and reducing costs.

[0017]

As described above, in the self-lubricating insulated wire of the present invention, the use of the insulating paint to which a specific amino acid and / or phosphate ester is added allows the formation of an insulating film having good slipperiness, and The line workability can be greatly improved. In addition, the coating does not cause a repelling phenomenon and does not deteriorate in properties such as heat resistance and electrical properties, and has a good appearance. Furthermore, since no new coating or baking step is required for manufacturing, workability is not reduced and manufacturing costs are not significantly increased as compared with the conventional one.

[0018]

EXAMPLES Examples of the present invention will be described below. Example 1 Polyester varnish (trade name TVE 5 manufactured by Toshiba Chemical Corporation)
350), 0.1 parts by weight of N-
Insulation paint prepared by adding and mixing stearyl aspartic acid β-stearyl ester (trade name: Famex A-18, manufactured by Ajinomoto Co., Inc.) is approximately 38 μm thick on a 1 mmφ copper wire. And baking to obtain a self-lubricating insulated wire. The baking was performed using a baking machine with a furnace length of 6 m at a linear velocity of 12 m / min and a temperature of 370 ° C.

Examples 2 to 8 An insulating paint was prepared in the same manner as in Example 1 except that the composition of the insulating paint and the baking conditions of the insulating paint were changed as shown in Table 1. And self-lubricating insulated wires were obtained. The insulating varnish used here was a polyester varnish (trade name E707, manufactured by Showa Electric Cable Co., Ltd.), a polyester imide varnish (trade name: Isomid 40SH, manufactured by Nippon Shokubai Co., Ltd.), polyurethane varnish (East) in addition to the polyester varnish used in Example 1. Product name TPU 524
2) In addition to N-stearyl aspartic acid β-stearyl ester used in Example 1, N-lauroyl L-lysine (trade name Famex L-12 manufactured by Ajinomoto Co.) distearyl phosphate ( Ajinomoto's product name Famex P-18) was used.

Table 1 shows the characteristics of the self-lubricating insulated wires obtained in the above embodiments.

Next, for comparison, the four types of insulating varnishes used in the examples were individually applied and baked on a 1 mmφ copper wire to obtain insulated wires having a conventional structure (Comparative Examples 1 to 4). Further, the polyester varnish used in the examples, N- octanoyl which is an amino acid having a hydrocarbon group having less than 11 carbon atoms
Insulation prepared by adding and mixing L-lysine [C ₇ H ₁₅ CONH (CH ₂ ) ₄ CH (NH ₂ ) COOH] or dicapryl phosphate, which is a phosphate having a hydrocarbon group with less than 11 carbon atoms The paint was applied and baked on a 1 mmφ copper wire in the same manner as in the examples to obtain insulated wires (Comparative Examples 5 and 6). Table 1 also shows the characteristics of these insulated wires.

[0022]

[Table 1] As is clear from Table 1, the self-lubricating insulated wire of the present invention has improved slipperiness and abrasion resistance as compared with those of the comparative example, and is comparable in heat resistance and other properties to the comparative example. Has good characteristics.

[0023]

As described above, according to the self-lubricating insulated wire of the present invention, the slipperiness and the abrasion resistance are improved, and a high-speed and high-density coil winding becomes possible. In addition, the repelling phenomenon does not occur, and the heat resistance and the electrical characteristics do not deteriorate and the appearance does not deteriorate. Further, the manufacturing is easy, and the manufacturing cost does not increase significantly.

Therefore, it is useful for the manufacture of electric equipment such as motors and transformers.
Cost reduction can be achieved.

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Yasuharu Takagi (56) References JP-A-49-32169 (JP, A) JP-A-56-143266 (JP, A) JP-A-62-154409 (JP, A) JP-A-52-56104 (JP, A) JP-A-62-151495 (JP, A) JP-A-63-3098 (JP, A) JP-A-63-89549 (JP, A) JP-A-3-31366 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 7/02 H01B 3/30 H01B 7/18 C09D 5/25

Claims (1)

(57) [Claims] (1) An amino acid having a hydrocarbon group having 11 or more carbon atoms in a molecule or a derivative thereof, per 100 parts by weight of a resin for forming a baked film, directly or via an insulating film on a conductor; And / or (b) a self-lubricating insulating material characterized by comprising a coating and baking layer of an insulating paint obtained by adding 0.05 to 15 parts by weight of a phosphoric ester having a hydrocarbon group having 11 or more carbon atoms in the molecule. Electrical wire.