JP3361597B2 - 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 a self-lubricating insulated wire in which an insulating layer formed on the surface itself has good slipperiness.

[0002]

2. Description of the Related Art In general, an insulated wire is liable to be damaged or broken due to a load applied during its manufacture and processing. In order to reduce this load, it is effective to increase the slipperiness of the surface of the insulated wire to reduce the frictional resistance. Therefore, initially, as a means to enhance the slipperiness, lubricating oil, paraffin, A method of applying a lubricating component such as wax, a method of providing an overcoat layer made of a resin having a low coefficient of friction such as nylon or polyethylene, a method of incorporating the lubricating component into the insulating layer, and the like have been adopted.

However, in recent years, for the purpose of speeding up the entire manufacturing and processing steps and improving space efficiency, the winding speed and the occupancy rate, that is, the amount of electric wires to be arranged in a certain space, tends to increase. As a result, the load applied to the insulated wire is inevitably increased, and the above-mentioned means can no longer cope with it.

Therefore, recently, as an alternative to the above, a method of incorporating powders of polyethylene, fluorine resin, silicone resin, etc. in the insulating layer has appeared, and a method of incorporating polyethylene powder, which is particularly advantageous in terms of cost, is introduced. Is being used a lot.

However, in the method of blending these resin powders in the insulating layer, it is difficult to uniformly disperse the resin powders in the insulating coating used for forming the insulating layer, the stability of the coating is deteriorated, and the mechanical properties of the insulating layer are reduced. There is a problem that the physical and physical properties are deteriorated and the appearance is deteriorated due to the non-uniform dispersion of the fine powder.

[0006]

Means for Solving the Problems As a result of intensive studies in view of the above situation, the present inventors have found that when an insulating coating used for forming an insulating layer contains polyalkylene glycol or a derivative thereof. In addition, the stability of this paint can be improved, and it is possible to form an insulating layer that exhibits extremely excellent slipperiness without impairing the original wire characteristics, and it is possible to increase the winding speed and increase the occupancy rate in recent years. They have found that an insulated electric wire having a high self-lubricating property that can be dealt with can be obtained, and have completed the present invention.

That is, the self-lubricating insulated electric wire according to claim 1 of the present invention is made of polyalkylene glycol and its derivative , either directly on the conductor or through another insulating layer .
The average molecular weight of the polyalkylene glycol component is 300-
An insulating layer is formed by applying and baking an insulating coating material containing 3000 polyalkylene glycol or / and a derivative thereof.

[0008]

According to a second aspect of the present invention, in the self-lubricating insulated wire according to the first aspect , the polyalkylene glycol derivative is a fatty acid monoester or diester of polyalkylene glycol.

Claims [0010] The present invention 3 is obtained by employing the configuration number of carbon atoms of the fatty acid component in the fatty acid monoester or diester of a polyalkylene glycol in a self-lubricating insulated wire of the claim 2 is 16 or more.

According to a fourth aspect of the present invention, in the self-lubricating insulated wire according to the first to third aspects, the polyalkylene glycol or / and its derivative is 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin component of the insulating coating. It employs a composition in which parts by weight are mixed.

[0012]

Detailed Structure and Function of the Invention The insulating layer on the surface of the insulated wire of the present invention is formed by applying and baking an insulating coating material containing polyalkylene glycol or / and a derivative thereof as described above, It exhibits extremely excellent slipperiness and sufficiently retains the original properties of the insulating layer such as heat resistance. Further, since the insulating paint has good stability, it is possible to obtain an insulated wire having a smooth surface and a good appearance even when the paint is used after being stored for a long period of time without causing deterioration of various electric wire properties including slipperiness. .

The reason why the above-mentioned excellent self-lubricating property is exhibited by the use of such a polyalkylene glycol or / and its derivative is not clear, but the polyalkylene glycol and its derivative have a molecular structural lubricating function. In addition, since these components are soluble in a solvent generally used for an insulating coating and dissolve uniformly in the coating, they were uniformly contained in the insulating layer formed from the coating. It is considered that the components that appear in the state and appear on the surface of the insulating layer efficiently exhibit the lubricating action. Further, since the polyalkylene glycol and its derivative are uniformly dissolved in the insulating paint and mixed with the resin component as described above, the stability of the paint is supposed to be good.

Although the slipperiness of the surface of the electric wire is improved by using any of the polyalkylene glycol and its derivative, the polyalkylene glycol derivative obtained by reacting the terminal hydroxyl group of the polyalkylene glycol with the aliphatic hydrocarbon derivative. Especially preferred are fatty acid monoesters or diesters of polyalkylene glycols. That is, in these polyalkylene glycol derivatives, the aliphatic hydrocarbon groups are derived from the entire surface of the insulating layer in a so-called napped state, and they are intervened between the contact object in the manufacturing and processing steps of the electric wire to cause friction. It acts as a lubricating component that significantly reduces the coefficient, and because the derivative does not easily separate from the insulating layer due to the high affinity of the polyoxyalkylene structure portion for the insulating layer constituent resin, the above-mentioned excellent lubricating action is maintained. It is estimated to be effective.

As the fatty acid monoester or diester of polyalkylene glycol suitable as the above derivative, the fatty acid component has 16 or more carbon atoms in order to more effectively exert the lubricating action by the above-mentioned aliphatic hydrocarbon group. The ones are the best. Further, the average molecular weight of the polyalkylene glycol component in the polyalkylene glycol and its derivative is preferably in the range of 300 to 3000, and if it is too small, the stability of the insulating coating decreases and the appearance of the insulated electric wire deteriorates. After that, the lubricating effect is reduced. In addition, this polyalkylene glycol component,
Polyethylene glycol, polypropylene glycol,
Any of polyethylene-propylene glycol may be used, but polyethylene glycol is particularly preferable.

In order to produce the self-lubricating insulated wire of the present invention, the above-mentioned polyalkylene glycol derivative is blended in the above-mentioned insulating paint, and this paint is applied directly to a conductor such as annealed copper wire or another insulating layer. The insulating layer having a required thickness may be formed by coating and baking. As this insulating layer, there are a usual insulating layer mainly for electrical insulation, and a fusion insulating layer for imparting self-fusion property when it is applied to a winding wire of a motor, a transformer, a coil or the like.

Examples of the former ordinary insulating coating for forming an insulating layer include polyurethane coating, polyester coating, polyester imide coating, polyamide imide coating, polyvinyl formal coating and modified coatings thereof. As the insulating coating material for forming the insulating layer for fusing, for example, polyamide coating material, polyester coating material, epoxy coating material, polyvinyl butyral coating material,
Examples thereof include mixed paints. Incidentally, in an insulating paint containing a reactive component having a functional group that reacts with a hydroxyl group such as an isocyanate compound of polyurethane paint,
When a polyalkylene glycol or a fatty acid monoester thereof is used, a part of the reactive component is consumed by the reaction with the hydroxyl group at the terminal of the molecule, and therefore, the reactive component should be used in a larger amount corresponding to this consumption amount. Good. On the other hand, the other insulating layer interposed as a base may be the same as the former ordinary insulating layer.

The amount of polyalkylene glycol and its derivative to be blended is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the resin component of the insulating coating, and if it is too small, sufficient slipperiness cannot be exhibited. On the other hand, if the amount is too large, the original wire characteristics will deteriorate. Moreover, you may use together 2 or more types of these polyalkylene glycols and its derivative (s). Therefore, these polyalkylene glycols or /
The thickness of the insulating layer containing the derivative and its derivative varies depending on the diameter of the conductor, the type of resin constituting the insulating layer, the use of the electric wire, the presence or absence of another insulating layer as a base, and the like, but is generally about 5 to 50 μm.

[0019]

【Example】

Example 1 Polyurethane paint (trade name TPU-51 manufactured by Tokushu Paint Co., Ltd.
00), 1% by weight of polyethylene glycol (average molecular weight about 1000) was added to the resin component, and 60
An insulating paint was prepared by heating and stirring at 1 ° C. for 1 hour. Then, this insulating coating material was applied onto a 0.30 mm diameter annealed copper wire a plurality of times and baked to form an insulating layer having a thickness of 13 μm to manufacture a self-lubricating insulated wire.

Example 2 Example 1 was repeated except that the same amount of polyethylene glycol monopalmitate (average molecular weight of polyethylene glycol component was about 1000) was used instead of polyethylene glycol.
A self-lubricating insulated wire was produced in the same manner as in.

Example 3 Example 1 was repeated except that the same amount of polyethylene glycol monostearate (average molecular weight of polyethylene glycol component was about 1000) was used instead of polyethylene glycol.
A self-lubricating insulated wire was produced in the same manner as in.

Example 4 Example 1 was repeated except that the same amount of polyethylene glycol monomontarate (average molecular weight of polyethylene glycol component was about 1000) was used instead of polyethylene glycol.
A self-lubricating insulated wire was produced in the same manner as in.

Example 5 A self-lubricating insulated wire was manufactured in the same manner as in Example 1 except that polyethylene glycol monooleate (average molecular weight of polyethylene glycol component was about 1000) was used in place of polyethylene glycol.

Example 6 A self-lubricating insulated wire was produced in the same manner as in Example 1 except that the same amount of polyethylene glycol distearate (average molecular weight of polyethylene glycol component was about 1000) was used instead of polyethylene glycol.

Example 7 A self-lubricating insulated wire was produced in the same manner as in Example 6 except that the same amount of polyethylene glycol component having an average molecular weight of about 300 was used as polyethylene glycol distearate.

Example 8 A self-lubricating insulated wire was produced in the same manner as in Example 6 except that the same amount of polyethylene glycol component having an average molecular weight of about 3000 was used as polyethylene glycol distearate.

Example 9 The amount of polyethylene glycol monostearate used was 5
A self-lubricating insulated electric wire was produced in the same manner as in Example 3 except that the content was changed to% by weight.

Example 10 A polyester coating (trade name: Decorate E220 manufactured by Nitto Denko Corporation) was used in place of the polyurethane coating, except that
A self-lubricating insulated electric wire was manufactured in the same manner as in Example 3.

Example 11 A self-lubricating insulated wire was produced in the same manner as in Example 3 except that polyamideimide paint (trade name HI-405 manufactured by Hitachi Chemical Co., Ltd.) was used in place of the polyurethane paint.

Example 12 Polyamide-based fusion paint (trade name: TCV- manufactured by Tokushu Paint Co., Ltd.)
To U2), add 1% by weight of polyethylene glycol monostearate to the resin component,
An insulating paint was prepared by heating and stirring for an hour. Then, this insulating paint is applied multiple times on a polyester insulated wire having a diameter of 0.30 mm and baked to form an insulating layer having a thickness of 13 μm.
A self-lubricating insulated wire was manufactured.

Comparative Example 1 An insulated wire was manufactured in the same manner as in Example 1 except that the polyurethane coating material of Example 1 was used without adding polyethylene glycol.

Comparative Example 2 To the polyurethane coating used in Example 1, 1% by weight of polyethylene powder (trade name Sun Wax 161P manufactured by Sanyo Kasei Co., Ltd.) was added to the resin component, and the mixture was mixed at 60 ° C. for 1 hour. An insulating paint was prepared by time-dispersed mixing. Then, a self-lubricating insulated electric wire was manufactured in the same manner as in Example 1 using this insulating paint.

Comparative Example 3 Liquid paraffin (1 μm) was placed on the insulated wire obtained in Comparative Example 1.
It was applied to a thickness of m to obtain a self-lubricating insulated electric wire.

Comparative Example 4 An insulated wire was produced in the same manner as in Example 10 except that the polyester coating material of Example 10 was used without adding polyethylene glycol monostearate.

Comparative Example 5 An insulated wire was produced in the same manner as in Example 11 except that the polyamideimide coating composition of Example 11 was used without adding polyethylene glycol monostearate.

Comparative Example 6 An insulated electric wire was produced in the same manner as in Example 12 except that the polyamide fusion-bonding paint of Example 12 was used without adding polyethylene glycol monostearate.

Comparative Example 7 A self-lubricating insulated wire was produced in the same manner as in Example 6 except that the same amount of polyethylene glycol component having an average molecular weight of about 200 was used as polyethylene glycol distearate.

Comparative Example 8 A self-lubricating insulated wire was produced in the same manner as in Example 6 except that the same amount of polyethylene glycol component having an average molecular weight of about 4000 was used as polyethylene glycol distearate.

The insulated wires of the above Examples and Comparative Examples were tested and evaluated for appearance (according to JIS C 30034.), softening resistance (according to JIS C 3003 12.), slipperiness, and coating stability. The results are shown in Table 1 below. The test methods for slipperiness and paint stability are as follows.

[Sliding property] ... Two insulated wires are attached in parallel to a metal block, and the two are fixed on a flat surface.
Place the wires on the same parallel insulated wire of the book so that the wires cross each other at a right angle, and measure the minimum load required for the metal block of the former to move along the insulated wire on the plane of the latter. The load (g) / load (g) of the metal block = sliding property.

[Paint stability] ... Inner diameter 1 mm, length 1
Put 10 ml of insulating paint into a 20 mm test tube,
Visual observation after leaving at room temperature for 6 months, and if the separation of lubricant in the paint or the turbidity of the paint is noticeable, "poor"
The case where it was slightly generated was judged to be “slightly bad”, and the case where it was not generated was judged to be “good”.

[0042]

[Table 1]

From the characteristic comparison of the self-lubricating insulated wires of Examples 1 to 12 and the insulated wires of Comparative Examples 1 to 6 shown in the above table, the self-lubricating insulated wires of the present invention show very excellent slipperiness. It is clear that the wire exhibits excellent properties and the stability of the insulating coating is good, and the original electric wire characteristics are sufficiently retained. On the other hand, it can be seen that the insulated wire using polyethylene powder as the lubricant (Comparative Example 2) has good slipperiness, but the stability of the insulating paint is poor, and the appearance of the wire is also poor.
Further, it can be seen that the insulated wire in which the surface of the insulating layer is coated with liquid paraffin (Comparative Example 3) has insufficient slipperiness.
Further, comparison between Examples 6 to 8 and Comparative Examples 7 and 8 suggests that the average molecular weight of the polyethylene glycol component in the polyethylene glycol derivative is preferably in the range of 300 to 3000.

[0044]

According to the invention of claim 1, as a self-lubricating insulated wire in which the insulating layer of the surface portion itself has slipperiness, it is possible to sufficiently cope with the recent increase in winding speed and increase in occupancy rate. It is possible to provide a product that continuously exhibits high self-lubricating property and that sufficiently has original electric wire properties such as appearance and heat resistance. Further, the stability of the insulating coating material for forming the insulating layer is good, and even if the coating material is used after being stored for a long period of time, the characteristics of various electric wires including the self-lubricating property are not easily deteriorated, and the surface is smooth and good. An insulating layer having a unique appearance can be obtained.

[0045]

According to the second aspect of the present invention, as the above self-lubricating insulated wire, a wire excellent in self-lubricating property and its durability is provided.

According to the third aspect of the present invention, as the above self-lubricating insulated wire, there is provided one which exhibits further excellent self-lubricating property.

According to the invention of claim 4, as the self-lubricating insulated wire, there is an advantage that a wire having both high self-lubricating property and original wire characteristics such as appearance and heat resistance can be surely obtained. .

Front Page Continuation (72) Inventor Seiichiro Otani 2-19-1 Inadera, Amagasaki City, Hyogo Prefecture Daiichi Denko Co., Ltd. Inside Winding Technology Development Department (56) Reference JP-A-4-342904 (JP, A) 62-154409 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01B ⁷ /00-7/02 H01B 3/16-3/56 C09D 1/00-10/00 C09D 101/00-201/10

Claims (4)

(57) [Claims] 1. The average molecular weight of the polyalkylene glycol component is 30 directly on the conductor or through another insulating layer.
A self-lubricating insulated electric wire having an insulating layer formed by applying and baking an insulating coating material containing 0 to 3000 polyalkylene glycol or / and a derivative thereof. 2. The polyalkylene glycol derivative is poly
Alkyl glycol fatty acid monoesters or die
The self-lubricating insulated electric wire according to claim 1, which is a tellurium. 3. Polyalkylene glycol fatty acid mono
The carbon number of the fatty acid component in the ester or diester is
The self-lubricating insulated electric wire according to claim 2, which is 16 or more . 4. Polyalkylene glycol or / and its
Is based on 100 parts by weight of resin component of insulating paint
The composition according to any one of claims 1 to 3, which is blended in an amount of 0.1 to 10 parts by weight.
A self-lubricating insulated electric wire as described therein.