JP2009009824A - Insulated wire, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide insulated wire high in initial adhesion properties and low in adhesion property drop after heat deterioration, and to provide a manufacturing method thereof. <P>SOLUTION: A conductor 2 is coated with a film 3 made of an azole silane compound, the outer periphery of the film 3 is coated with enamel coating made of a resin composition containing either one of polyester imide, polyamide imide, polyimide, polyester, and polyurethane, and the enamel coating is baked to form an insulating film 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulated wire having improved adhesion between a conductor and an insulating film, and a method for manufacturing the insulated wire.

  In recent years, development of high-efficiency motors has progressed with the promotion of global energy conservation policies. Effectively increasing the efficiency of the motor is to improve the space factor of the enameled wire inserted into the slot. On the other hand, since the enamel wire receives a large mechanical force when inserted into the slot portion, the insulating film is likely to be damaged. In order to solve this problem, for example, it is effective to improve the slipperiness of the surface of the insulating film and to improve the adhesion between the insulating film and the conductor.

  Conventionally, as an example of means for improving adhesion, a method using a silane coupling agent has been proposed (for example, Patent Document 1).

JP 2001-93340 A JP 2001-256835 A Japanese Patent Laid-Open No. 10-88104

  Examples of conventional silane coupling agents include mercaptoalkoxysilane, aminoalkoxysilane, epoxyalkoxysilane, vinylalkoxysilane, allylalkoxysilane, and the like.

  However, the conventional silane coupling agent is effective in improving the adhesion at the initial stage (normal temperature), but has a problem that the decrease in adhesion is large after the thermal deterioration.

  For example, when the treatment varnish is cured at the time of producing the motor, it may be heated at 150 to 160 ° C. for several hours, and in such a case, the adhesion after thermal deterioration becomes important.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an insulated wire that has good initial adhesion and that has little decrease in adhesion after thermal degradation, and a method for manufacturing the same. .

  The present invention was devised to achieve the above object, and the invention of claim 1 is characterized in that the outer periphery of the conductor is coated with a film made of an azolesilane compound, and the outer periphery of the film is coated with polyesterimide, It is an insulated wire in which an enamel coating made of a resin composition containing any one of polyamideimide, polyimide, polyester and polyurethane is applied and baked to coat an insulating film.

  According to a second aspect of the present invention, the azole silane compound includes an imidazole silane, a benzimidazole silane, and a benzotriazole silane having an azole ring and an alkoxysilyl group, or a condensed ring of an azole ring and a benzene ring and an alkoxysilyl group in one molecule. The insulated wire according to claim 1, wherein the insulated wire is one or more compounds selected from derivatives thereof.

  According to a third aspect of the invention, there is provided a method of manufacturing an insulated wire in which an insulator is provided on an outer periphery of a conductor, and an azole ring and an alkoxysilyl group, or a condensed ring of an azole ring and a benzene ring and an alkoxysilyl group are provided on the outer periphery of the conductor. A film made of an azolesilane compound in one molecule is formed, and an enamel paint made of a resin composition containing any of polyesterimide, polyamideimide, polyimide, polyester, and polyurethane is applied to the outer periphery of the film and baked. It is a manufacturing method of the insulated wire which coat | covers an insulating film.

  According to a fourth aspect of the present invention, in the outer periphery of the conductor, an azole silane solution in which the azole silane compound is dissolved in a solvent made of water or alcohol is applied, and then heated and dried to remove the solvent. It is a manufacturing method of this insulated wire.

  The invention of claim 5 is the method for producing an insulated wire according to claim 4, wherein the azole silane solution is absorbed by a liquid absorbent material, and the liquid absorbent material is applied in contact with the conductor.

  ADVANTAGE OF THE INVENTION According to this invention, the insulated wire excellent in the adhesiveness (initial and after heat deterioration) of a conductor and an insulating film can be provided.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of an insulated wire showing a preferred embodiment of the present invention.

  As shown in FIG. 1, an insulated wire 1 according to this embodiment is provided with an azole silane compound film 3 formed by coating an azole silane compound on the outer periphery of a conductor 2, and on the outer periphery of the azole silane compound film 3. The enamel resin film 4 is provided.

  An azolesilane compound has an azole ring and an alkoxysilyl group, or a condensed ring of an azole ring and a benzene ring and an alkoxysilyl group in one molecule.

  Here, an azole ring or a condensed ring of an azole ring and a benzene ring imparts a curing accelerating action, an antirust action, and the like. On the other hand, the alkoxysilyl group improves the adhesion between the inorganic material (conductor 2) and the organic material (enamel resin film 4) by generating a siloxane bond by hydrolysis. Furthermore, heat resistance and moisture resistance are imparted by forming a siloxane network.

  The enamel resin film 4 is obtained by applying an enamel paint made of a resin composition containing polyesterimide, polyamideimide, polyimide, polyester, or polyurethane around the azolesilane compound film 3 and baking and curing it.

  The azole silane compound may be one or more compounds selected from imidazole silane, benzimidazole silane, benzotriazole silane, or derivatives thereof.

  Next, the manufacturing method of the insulated wire 1 which concerns on this embodiment is demonstrated.

  In the method for manufacturing the insulated wire 1, first, the azole silane compound film 3 is formed by coating the outer periphery of the conductor 2 with an azole silane compound.

  The silane compound is generally diluted before use. Since the azole silane compound is dissolved in water or alcohol, the azole silane compound is preferably dissolved in a solvent such as water or alcohol and used as an azole silane solution.

  After the azole silane solution is applied to the surface of the conductor 2, the azole silane compound film 3 is obtained by heating and drying to remove the solvent.

  Here, as a method of applying the azole silane solution to the surface of the conductor 2, the azole silane solution may be absorbed by a liquid absorbent material such as felt and the liquid absorbent material may be applied in contact with the conductor. However, the present invention is not limited to this, and it may be applied by die coating, brushing, spraying, or the like, or the conductor 2 may be immersed in an azolesilane solution.

  After the azole silane compound film 3 is formed, an enamel paint made of a resin composition containing polyester imide, polyamide imide, polyimide, polyester, or polyurethane is applied and baked, whereby the insulated wire 1 is obtained.

  The effect | action of the insulated wire 1 which concerns on this embodiment is demonstrated.

  In the insulated wire 1 according to this embodiment, the outer periphery of the conductor 2 is coated with an azolesilane compound and the azolesilane compound film 3 is coated, and the outer periphery thereof is coated with polyesterimide, polyamideimide, polyimide, polyester, or An enamel paint made of a resin composition containing polyurethane is applied and baked to coat the enamel resin film 4.

  Since the azole silane compound imparts hardening accelerating action, heat resistance, moisture resistance, etc., the adhesion between the conductor 2 and the enamel resin film 4 at the initial stage (room temperature) is higher than when a conventional silane coupling agent is used. And adhesion after heat deterioration are improved. For this reason, for example, when the insulated wire 1 is used for a motor or the like that requires processing at a high temperature, the reliability can be improved. For the same reason, it is also useful for automobiles, trains, electrical equipment and the like.

  The conductor 2 was commonly a copper wire having a diameter of 1 mm.

  As the azole silane compound, imidazole silane was used. This imidazole silane was dissolved in a 2 wt% methanol solution, the conductor 2 was immersed in the solution, and then the methanol was dried and removed. The molecular structure of the imidazole silane compound is shown below.

  As a conventional silane coupling agent to be compared, 3-mercaptopropyltrimethoxysilane, which is a typical mercaptosilane, was used. This was similarly dissolved in a 2 wt% methanol solution, the conductor 2 was immersed in the solution, and then the methanol was dried and removed.

  The adhesion evaluation of the insulated wire 1 was performed according to the following method.

  The linear sample of the insulated wire 1 is fixed to two clamps that are 250 mm apart on the same axis, and the coating on two sides parallel to the length direction of the sample is removed until the conductor 2 is reached. Thereafter, one of the clamps was rotated at room temperature, and the initial adhesion was obtained by measuring the number of rotations when the film floated.

  The adhesion after thermal deterioration is obtained by measuring the number of rotations when the film floats by the same method as the initial stage after heating the linear sample in a thermostat at 160 ° C. for 6 hours.

Example 1
The conductor 2 was surface-treated with an imidazole silane compound, and a polyesterimide coating was applied and baked on the outer periphery thereof so as to have a film thickness of 30 μm. After that, as a result of evaluating the adhesiveness after the initial stage and after the thermal deterioration, the initial stage was 90 times and the post-thermal degradation stage was 86 times.

(Example 2)
The conductor 2 was surface-treated with an imidazole silane compound film, and a polyamide-imide paint was applied and baked on the outer periphery thereof so as to have a film thickness of 30 μm. After that, as a result of evaluating the adhesiveness after the initial stage and after the thermal deterioration, the initial stage was 60 times and the post-thermal degradation stage was 55 times.

(Comparative Example 1)
A polyesterimide coating was applied to the conductor and baked to a film thickness of 30 μm. Thereafter, as a result of evaluating the adhesiveness after the initial stage and after the thermal deterioration, the initial stage was 81 times and the thermal degradation was 82 times.

(Comparative Example 2)
The conductor was surface-treated with a mercaptosilane compound film, and a polyesterimide coating was applied and baked on the outer periphery so as to have a film thickness of 30 μm. Thereafter, as a result of evaluating the adhesiveness after the initial stage and after the heat deterioration, the initial stage was excellent at 93 times, but after the thermal deterioration was very poor at 44 times.

(Comparative Example 3)
The conductor was coated and baked with a polyamideimide coating so as to have a film thickness of 30 μm. Thereafter, as a result of evaluating the adhesiveness after the initial stage and after the thermal deterioration, the initial stage was 49 times and the thermal degradation was 51 times.

(Comparative Example 4)
The conductor was surface-treated with a mercaptosilane compound film, and a polyamide-imide paint was applied and baked on the outer periphery so as to have a film thickness of 30 μm. Thereafter, as a result of evaluating the adhesiveness after the initial stage and after the thermal degradation, the initial stage was excellent at 62 times, but after the thermal degradation, it was very poor at 31 times.

  The experimental results of Examples 1 and 2 and Comparative Examples 1 to 4 are summarized in Table 1.

  From Table 1, it has confirmed that the insulated wire 1 of Examples 1 and 2 had high initial adhesiveness and the adhesiveness after heat deterioration compared with the insulated wire of Comparative Examples 1-4.

It is a cross-sectional view of an insulated wire showing a preferred embodiment of the present invention.

Explanation of symbols

1 Insulated wire 2 Conductor 3 Azole silane compound film 4 Enamel resin film

Claims (5)

  A film made of an azolesilane compound is coated on the outer periphery of the conductor, and an enamel paint made of a resin composition containing any of polyesterimide, polyamideimide, polyimide, polyester, and polyurethane is applied to the outer periphery of the film and baked. An insulated wire characterized by being coated with an insulating film.   The azole silane compound is selected from imidazole silane, benzimidazole silane, benzotriazole silane or derivatives thereof having an azole ring and an alkoxysilyl group, or a condensed ring of azole ring and benzene ring and an alkoxysilyl group in one molecule. The insulated wire according to claim 1, wherein the insulated wire is one or more compounds.   In the method for producing an insulated wire in which an insulator is provided on the outer periphery of a conductor, an azolesilane having an azole ring and an alkoxysilyl group, or a condensed ring of an azole ring and a benzene ring and an alkoxysilyl group in one molecule on the outer periphery of the conductor A film made of a compound is formed, and an enamel coating made of a resin composition containing any of polyesterimide, polyamideimide, polyimide, polyester, and polyurethane is applied to the outer periphery of the film and baked to coat the insulating film. A method for manufacturing an insulated wire, which is characterized.   The method for producing an insulated wire according to claim 3, wherein an azole silane solution in which the azole silane compound is dissolved in a solvent comprising water or alcohol is applied to the outer periphery of the conductor, and then the solvent is removed by heating and drying.   The method for producing an insulated wire according to claim 4, wherein the azole silane solution is absorbed by a liquid absorbent material, and the liquid absorbent material is applied in contact with the conductor.

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