JP2870685B2 - Lubricating insulation paint and insulated wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating insulating paint and an insulated wire which provide a self-lubricating insulated wire having excellent self-lubricating properties and improved resistance to processing deterioration.

[0002]

2. Description of the Related Art In recent years, electric appliance manufacturers have
2. Description of the Related Art A high-speed automatic winding machine has been widely used to speed up the process of coil winding of a communication device or the like. For this reason, the surface of the insulating layer of the insulated wire is required to have sufficient slipperiness or wear resistance.

[0003] In other words, at the time of winding, the insulated wire is subjected to friction at the needle and the pulley, and the insulating layer is mechanically damaged. Therefore, as the winding speed increases, the defective rate of the insulated wire increases, and it is required to reduce the defective rate. Further, in the case of coil molding, if the slipperiness between the insulated wires and between the insulated wire and the device is poor, the coil space factor increases, and the insertability of the motor into the slot decreases. In accordance with these problems, an insulated wire having good slipperiness has been demanded.

[0004]

In order to meet these demands, conventionally, a method of thinly applying a lubricant such as a wax or a lubricating oil on an insulated wire, and a resin having a low coefficient of friction such as nylon or polyethylene have been used. Insulated wires, etc., which are over-coated with, are extremely difficult to apply a lubricant uniformly to the outer layer of the insulated wires. Is difficult to solve. The latter method has a drawback that the number of manufacturing steps increases because the overcoat layer is made of a material different from that of the insulating film, and a drawback in characteristics caused by the material of the overcoat layer.

Therefore, as an alternative to the above method, a specific amount of a low molecular weight polyethylene having an average molecular weight of 5,000 or less as a solution or a fine particle dispersion is blended into an insulating coating for forming an insulating film (Japanese Patent Publication No. 51-28420). And JP-A-53-9392), and an average particle diameter of 10 μm.
It has been proposed that a low-molecular-weight polyethylene having an average molecular weight of 8,000 or less and a specific amount be blended as a solution or a fine particle dispersion (see JP-A-2-199710).

In each of the above proposed means, the friction coefficient is reduced and the abrasion resistance of the insulating film is reduced by blending the polyethylene fine powder into the insulating paint. Better results are obtained than by means of forming. However, the polyethylene solution or the fine particle dispersion has poor compatibility with the insulating paint, and when used for a long time, phase separation occurs between the two, resulting in a problem that the friction coefficient of the insulating coating varies. Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a lubricating insulating paint which provides an insulated wire having excellent self-lubricating properties and excellent coil winding workability while solving the problem of the insulating paint. To provide insulated wires.

[0007]

The above objects are achieved by the present invention described below. That is, the present invention provides an average molecular weight of 5,0
Lubricity, characterized in that oxidized polyethylene fine powder having an average particle size of 10 μm or less and an acid value of 20 or more is compounded in a proportion of 0.1 to 10% by weight based on the resin component of the insulating paint. An insulated wire comprising an insulating paint and a lubricating insulating paint applied and baked to a conductor via another insulating material.

[0008]

[Action] Average molecular weight of 5,000 or less, average particle diameter of 10 μm
By blending the oxidized polyethylene fine powder having an acid value of not more than 20 and an acid value of not less than 20 with the insulating coating at a ratio of 0.1 to 10% by weight of the insulating resin, the dispersibility of the lubricant and the stability of the insulating coating are remarkably improved. By doing so, the insulated wire overcoated by applying and baking it to the conductor via another insulator has stable sliding properties and abrasion resistance in the length direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The oxidized polyethylene fine powder mainly characterizing the present invention has an average molecular weight of 5,0.
It is not particularly limited as long as it has an average particle diameter of 10 or less and an acid value of 20 or more. Preferred average molecular weight is
It is about 1,000 to 5,000, and the preferred average particle size is about 2 to 10 μm. When the acid value is less than 20, the stability of the insulating paint is poor, and the friction coefficient of the insulated wire varies in the length direction.

The oxidized polyethylene fine powder is added in an amount of 0.1 to 10% by weight, preferably 0.2 to 5% by weight, based on the resin content of the insulating paint. If the addition amount is less than 0.1% by weight, the effect of the slipperiness of the insulated wire obtained is inferior.
If the content exceeds 0% by weight, the stability of the insulating paint is lost, and the appearance of the obtained insulated wire is deteriorated.

There is no particular limitation on the insulating coating used in the present invention. For example, resins such as polyvinyl formal, polyurethane, polyester imide urethane, polyester, polyester imide, polyester amide imide, polyhydantoin, polyamide imide, and polyimide are suitably used. Any conventionally known insulating paint dissolved or dispersed in a solvent can be used. Further, as the fusing paint, any conventionally known fusing paint obtained by dissolving or dispersing a resin such as polyamide, polyester, phenoxy and butyral in a suitable solvent can be used.

As a means for blending the oxidized polyethylene fine powder into these insulating paints, from the viewpoint of dispersibility, a method of adding and mixing the fine powder in a dispersion form in which the fine powder is dispersed in a solvent such as toluene, xylene or naphtha is preferable. It is.

[0013] By applying and baking the conductor with the lubricating insulating paint of the present invention via another insulator and overcoating, an insulated wire having excellent slipperiness can be obtained. Other insulators are not particularly limited, and include, for example, polyvinyl formal-based, polyurethane-based, polyesterimide-urethane-based, polyester-based, polyesterimide-based, polyesteramideimide-based, polyhydantoin-based, polyamideimide-based, polyimide-based insulation, and the like. Coatings.

[0014] Insulating film by lubricating insulating paint of the present invention
The method of forming may be in accordance with a conventionally known method.
For example, a method such as a felt drawing method or a die drawing method
Apply more insulating paint and continuously heat at 350-550 ° C.
Pass several times or multiple times in a baking furnace or multiple baking furnaces
As a result, a desired insulating film is formed. Its insulating skin
The thickness of the film conforms to JIS, NEMA or IEC standards.
The specified coating thickness, of which the self-lubricating coating is 1
The thickness is 5 μm or less, preferably 3 to 10 μm. This
Is formed by one coating and baking.
If not, apply and bake repeatedly as necessary
Just do it.

[0015]

Next, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. Example 1 10 parts by weight of oxidized polyethylene fine powder having an average molecular weight of 3,500, an average particle diameter of 7 μm, and an acid value of 30 were added to 90 parts by weight of xylene.
The weight part was added and dispersed by a homomixer to obtain a dispersion. 8 parts by weight of this dispersion was added to 100 parts by weight of a polyester insulating coating (Telebeck E1050, manufactured by Dainichi Seika Kogyo Co., Ltd., resin content: 40% by weight), and the mixture was stirred and dispersed to obtain a lubricating insulating coating of the present invention.

Example 2 Instead of the polyester insulating coating in Example 1, a polyamideimide insulating coating (Alloterm 602, manufactured by Dainichi Seika Kogyo Co., Ltd., 30% by weight of resin) was used, and 6 parts by weight of the dispersion of Example 1 was used. Was added to 100 parts by weight of Alloterm 602, and the mixture was stirred and dispersed to obtain a lubricating insulating paint of the present invention.

EXAMPLE 3 10 parts by weight of oxidized polyethylene fine powder having an average molecular weight of 3,000, an average particle diameter of 7 μm and an acid value of 25 were added to 90 parts by weight of xylene.
A part by weight was added and dispersed by a homomixer to obtain a dispersion.
8 parts by weight of this dispersion was added to 100 parts by weight of a polyester insulating coating (Telebeck E1050), and the mixture was stirred and dispersed to obtain a lubricating insulating coating of the present invention.

Example 4 Instead of the polyester insulating coating in Example 3, a polyamideimide insulating coating (Alloterm 602) was used, and 6 parts by weight of the dispersion of Example 3 was added to 100 parts by weight of Alloterm 602, followed by stirring. By dispersing, a lubricating insulating paint of the present invention was obtained.

Comparative Example 1 10 parts by weight of oxidized polyethylene fine powder having an average molecular weight of 2,000, an average particle diameter of 5 μm and an acid value of 15 were added to 90 parts by weight of xylene.
A part by weight was added and dispersed by a homomixer to obtain a dispersion.
8 parts by weight of this dispersion was added to 100 parts by weight of a polyester insulating coating (Telebeck E1050), and the mixture was stirred and dispersed to obtain a lubricating insulating coating of a comparative example.

Comparative Example 2 Instead of the polyester insulating paint of Comparative Example 1, a polyamideimide insulating paint (Alloterm 602) was used, and 6 parts by weight of the dispersion of Comparative Example 1 was added to 100 parts by weight of Alloterm 602, followed by stirring. It was dispersed to obtain a lubricating insulating paint of Comparative Example.

Comparative Example 3 To 90 parts by weight of xylene, 10 parts by weight of a fine polyethylene powder having an average molecular weight of 2,500 and an average particle diameter of 5 μm was added and dispersed by a homomixer to obtain a dispersion. 8 parts by weight of this dispersion was added to 100 parts by weight of a polyester insulating coating (Telebeck E1050), and the mixture was stirred and dispersed to obtain a lubricating insulating coating of a comparative example.

Comparative Example 4 Instead of the polyester insulating paint of Comparative Example 3, a polyamideimide insulating paint (Alloterm 602) was used, and 6 parts by weight of the dispersion of Comparative Example 3 was added to 100 parts by weight of Alloterm 602, followed by stirring. It was dispersed to obtain a lubricating insulating paint of Comparative Example.

[Test Example] The lubricating insulating paints of Examples 1-4 and Comparative Examples 1-4 were coated with PEW (telebeck E1050) having a conductor diameter of 1.0 mmφ and a coating thickness of 30 μm using a coating thickness of 4-5 μm. A lubricated insulated wire was prepared by coating and baking so as to obtain the following properties. The properties of the obtained lubricated insulated wire were tested according to JIS C3003, and the results are shown in Tables 1 and 2.

[0024]

[Table 1] Paint and wire characteristics immediately after preparation

(Continuation of Table 1)

[0026]

[Table 2] Paint and wire characteristics after leaving at 40 ° C for 1 week

(Continuation of Table 2) 1) JIS C3003-1976 2) Measured using a wire slip tester manufactured by Toyobo Seiki. As is clear from Tables 1 and 2, the insulated wire obtained from the lubricating insulating coating of the present invention has excellent slipperiness and abrasion resistance, and also has excellent dispersion stability.

[0028]

As is clear from the examples, the lubricating insulating coating material of the present invention has a good dispersion stability at high temperatures and does not separate the oxidized polyethylene fine powder even after long-term storage. In addition, by applying and baking the lubricating insulating paint of the present invention, an insulated wire having excellent slipperiness and abrasion resistance and a good appearance can be obtained, which is useful for recent severe winding, processing and assembly work. is there.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C09D 167/00 C09D 167/00 179/08 179/08 B (72) Inventor Masao Ikeda 1-chome Nihonbashi Bakurocho, Chuo-ku, Tokyo No. 7-6 Inside Dainichi Seika Kogyo Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) C09D 5/25 C09D 7/12 H01B 3/30 H01B 7/02 H01B 7/18

Claims (2)

(57) [Claims] An oxidized polyethylene fine powder having an average molecular weight of 5,000 or less, an average particle diameter of 10 μm or less, and an acid value of 20 or more is used in an amount of 0.1 to 10% by weight based on the resin content of the insulating paint.
A lubricating insulating paint characterized by being blended at a ratio of: 2. An insulated wire obtained by applying and baking the insulating paint according to claim 1 to a conductor via another insulating material.