JPH04115411A - Insulated wire - Google Patents

Abstract

PURPOSE:To provide a high lubricating property and an antiwear property to an insulated wire by baking paint and varnish in which resin powder consists of mixed resin of PTFE and PE and its density is adjusted to a prescribed value. CONSTITUTION:Paint and varnish, in which 4wt.% of PTFE/PE mixed resin powder having a grain diameter of about 5mum, and specific gravity about 1.05 is added to a resin component of polyamide imide insulating paints for being mixed, are baking-painted on an esterimide insulated wire about 8 times in order to form a film having a thickness of about 15mum. Polyethylene resin is melted and mixed with PTFE having the highest lubrication property of general resin for the purpose of adjusting specific gravity, further, specific gravity of powder is adjusted in the range of 0.98 to 1.11 to be uniformly dispersed in the insulating paints in order to make it to manifest an excellent lubrication property at the time of baking. Thereby, an insulated wire having the high lubrication property and an anti-wear property can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an insulated wire with excellent lubricity and wear resistance.

[Prior art] In order to speed up the manufacturing of electric motors, transformers, etc., high-speed automatic winding machines are introduced to wind magnet wire (insulated wire), and it is possible to wind insulated wire at high speed. It is widespread. For this reason, insulated wires are now being handled under extremely harsh conditions.

Therefore, insulated wires are required to have extremely high lubricity and wear resistance.

As an insulated wire that satisfies such high requirements, an insulated wire in which lubricating resin powder such as polytetrafluoroethylene powder or polyethylene powder is dispersed in the outermost insulating layer of the insulated wire has been proposed.

Due to the non-adhesive and chemically stable characteristics unique to these resins, these resins have excellent lubricity and wear resistance for insulated wires, and are also suitable for use in refrigerators that are immersed in refrigerants such as fluorocarbons. It is said to be suitable as a magnet wire for a motor as it is less extracted by the refrigerant.

"Problems to be Solved by the Invention" However, in the above-mentioned insulated wire, the resin powder itself is poorly soluble in the solvent of the insulating paint, and the surface wettability is also poor (
Since there is a large difference in specific gravity from the insulating paint itself, it is difficult to uniformly disperse it in the insulating paint, making it difficult to obtain a uniform and homogeneous coating film.

For example, polytetrafluoroethylene powder, which has excellent lubricity, has a specific gravity of 18 to 2.2, and since the specific gravity of many insulation paint solvents, including cresol, has a specific gravity of around 10, particles tend to settle in the paint. It ends up.

Furthermore, although polytetrafluoroethylene has excellent lubricity, polyethylene powder, which has relatively excellent lubricity, has a specific gravity of 0.89 to 0.95 and floats on the insulation paint. Therefore, there was also the disadvantage that the preservability and storage stability of the insulating paint were reduced.

[Means for Solving the Problems] In the present invention, in order to take advantage of the characteristics of polytetrafluoroethylene and polyethylene, which have high lubricity, and to improve the dispersibility in insulation paint, the resin powder itself or polytetrafluoroethylene is used. It is made of a mixed resin of polyethylene and
Its density is 0. The above problem was solved by adjusting the ratio to 98 to 1.11.

The present invention will be described in detail below.

The mixed resin powder used in this invention is polytetrafluoroethylene (hereinafter referred to as PTFE).
It is a powdered mixed resin of polyethylene and polyethylene (hereinafter referred to as PE).

Such resin powder has a particle size of 0. 1-10
A micrometer one is used. If it is less than 10 μm, the particles will aggregate to form secondary particles and the actual particle size will become large, and if it exceeds 10 μm, the appearance and insulation resistance value of the insulated wire will deteriorate.

Generally, when PTFE and PE particles are mixed, each particle has a different specific gravity, so each particle separates in the insulating paint, with one precipitating and the other floating.

In this invention, P has the highest lubricity among general resins.
By melting and mixing polyethylene resin with TFE for the purpose of adjusting the specific gravity, turning this mixed resin into powder, and further adjusting the specific gravity of the powder from 0.98 to 111,
It is uniformly dispersed in the insulating paint, and baking can sometimes result in an insulated wire that exhibits excellent lubricity.

The PTFE and PE mixed particles may be prepared by melting and mixing them together to form a powder, or by preparing a fine PTFE powder in advance and keeping the powder at a temperature at which it will not melt, for example 1500C. By soaking in PE solution at ~3000C and spraying it, P
The desired powder can also be obtained by obtaining particles obtained by coating TFE particles with PE. In other ways, PTF
The object of the present invention can be achieved if the particles are a mixture of E and PE and have a specific gravity within the above range.

In order to adjust the specific gravity of the mixed resin powder from 0.98 to 1.11, the weight ratio of PTFE and PE is 1:50 to 1.
: They may be mixed at a ratio of 1:1. Of course, the PTFE used
Naturally, it changes depending on the specific gravity of PE.

In any case, the specific gravity of the mixed resin powder is 0.98 to 1.
．． What is necessary is just to mix both so that it may become 11.

Such a mixed resin powder is added to and mixed with an insulating paint, and applied onto a conductor or an insulating layer previously formed on a conductor to form an outermost insulating layer.

The insulating paint used here is not particularly limited, and commonly used materials such as polyester, polyurethane, polyesterimide, polyamideimide, polyamide, polyhydantoin, polyvinyl formal, polyvinyl butyral, epoxy, and silicone can be used. It is desirable to select boamide, polyamideimide, etc., which have good abrasion resistance.

The insulating layer in this invention is not limited to one layer, but may be two or more layers, and when two or more multilayer insulating layers are provided,
The mixed resin powder may be added to the insulating paint forming at least the outermost insulating layer.

The amount of the mixed resin powder added to the insulating paint is about 05 to 20% by weight based on the solid content of the insulating paint.

The insulating paint obtained in this way can be applied and baked directly onto the conductor, but in this case, the adhesion with the conductor decreases, so it is usually better to apply and bake it through another insulating film to improve the contact with the conductor. This is advantageous in terms of adhesion. In this case, the preferred film thickness ratio is approximately 1/20 to 1/1.

In such insulated wires, an insulating paint mixed with PTFE/PE mixed resin powder with a specific gravity of 0.98 to 1.11 is used to form the outermost insulating layer. The dispersibility of the resin powder into the paint is greatly improved, and as a result, the resin powder is uniformly dispersed in the insulating layer, resulting in a uniform and homogeneous insulating layer, and the appearance thereof is also good.

In addition, the storage stability of the insulating paint is improved, and resin powder does not precipitate even after long-term storage.

Hereinafter, a specific explanation will be given by showing examples.

Example (Example 1) A PTFE/PE mixed resin powder with a particle size of 5 μm and a specific gravity of 1.05 was coated with polyamide-imide insulation paint (Hitachi Chemical HI-4).
05) was added and mixed in an amount of 4% by weight based on the resin content, and this paint was coated and baked 8 times on an esterimide insulated wire (conductor diameter 1.00mm, film thickness 35μm) to form a 15μm thick film and insulate it. It was made into an electric wire.

(Example 2) In Example 1, the particle size was 2.5 μm as the resin powder, and the ratio!
An insulated wire was obtained in the same manner except that PTFE/PE mixed resin particles of 1.01 (LANCOWAX TF1780 manufactured by Langer) were used.

(Example 3) An insulated wire was obtained in the same manner as in Example 2 except that the amount added was 1% by weight.

(Example 4) An insulated wire was obtained in the same manner as in Example 1, except that a PTFE/PE mixed resin powder (LANCOWAX TF1778, manufactured by Lankel Co., Ltd.) having a particle size of 2.58 ml and a specific gravity of 0.99 was used as the resin powder.

(Example 5) The resin powder used in Example 1 was coated with polyester insulation paint (rlsONEL 200J manufactured by Schenectady Chemical Co., Ltd.).
) was added and mixed in an amount of 3% by weight, and this was coated and baked 8 times on a polyester wire (conductor diameter 1.00 mm, film thickness 35 μm).
A film with a thickness of 15 μm was formed to obtain an insulated wire with a finished diameter of 1.10 mm.

(Example 6) An insulated wire was obtained in the same manner as in Example 5 except that the resin powder used in Example 2 was used.

(Example 7) An insulated wire was obtained in the same manner as in Example 5, except that the resin powder used in Example 4 was used as the resin powder.

(Comparative Example 1) Polyamide-imide insulation paint (manufactured by Hitachi Chemical Co., Ltd., rHI
-405J) was coated 8 times on the polyesterimide wire (used in Examples 1 to 6) and baked to form a film with a thickness of 15 μm to obtain an insulated wire with a finished diameter of 1.10 mm.

(Comparative Example 2) PTFE powder with a particle size of 5 μm (manufactured by Daikin Industries, Ltd.)
"Luburon L-2J, specific gravity 2.2) was added to the polyamide insulation paint of Comparative Example 1 in an amount of 4% by weight based on the resin content, and mixed.
This was applied to the polyesterimide wire used in Comparative Example 1 in the same manner and baked to obtain an insulated wire.

(Comparative Example 3) An insulated wire was obtained in the same manner as in Comparative Example 2, except that the amount of PTFE resin powder added was 10% by weight.

(Comparative Example 4) An insulated wire was prepared in the same manner as in Comparative Example 2, except that the amount of PTFE resin powder added was 15% by weight.

(Comparative Example 5) PTFE resin powder with a particle size of 0.8 μm (manufactured by Central Glass Co., Ltd., “Cefral Lube VJ, specific gravity 1.9)” was mixed with polyamide insulation paint (manufactured by Hitachi Chemical Co., Ltd., rHI-405J).
) was added and mixed in an amount of 10% by weight based on the resin content, and this was applied to the polyester imide wire (used in Comparative Example 1) 8 times and baked to form a coating with a thickness of 15 μm and a finished diameter of 1.1
The insulated wire was 0 mm.

(Comparative Example 6) PE powder with a particle size of 3 μm (manufactured by Rankel Co., Ltd., specific gravity 0°95L)
ANGO-WAX PE1500) was added to the polyamide-imide insulation paint of Comparative Example 1 in an amount of 1% based on the resin content and mixed, and this was applied to the polyester-imide wire used in Comparative Example 1 in the same manner and baked to form an insulated wire. did.

(Comparative Example 7) 4% by weight of the PTFE powder used in Comparative Example 2 and 1% by weight of the polyethylene resin powder used in Comparative Example 6 were added to and mixed with the polyamide-imide insulation paint of Comparative Example 1, and this was added to the polyamide-imide insulation paint of Comparative Example 1. Coat the polyesterimide wire used in the same manner.
It was baked into an insulated wire.

(Comparative Example 8) Polyester insulation paint (manufactured by Schenectady Chemical Company)
IsONEL 200J) was applied onto an annealed copper wire with a diameter of 1.00 mm and baked to form a film with a thickness of 50 μm to obtain an insulated wire.

(Comparative Example 9) 4% of the PTFE powder and 1% by weight of the PE powder used in Comparative Example 7 were added to the polyester insulation paint used in Comparative Example 8.
Mix this and use it as a polyester wire (conductor diameter 1.00mm)
A polyester film (thickness: 35 μm) was coated 8 times and baked to form a film with a thickness of 15 μm, resulting in an insulated wire with a finished diameter of 1.10 mm.

In addition, the baking of the insulating paint in the above Examples and Comparative Examples was carried out using a baking oven with an evening effect length of 5 m at a furnace temperature of 400°C.
The line speed was 15 m/min.

The characteristics of each insulated wire obtained in the above manner are
It was determined in accordance with 5-C-3003. However, the static friction coefficient was measured using a wire slip tester manufactured by Toyo Seiki Co., Ltd. under a load of 200 g. In addition, the number of reciprocating frictions is the old JI
Measured according to S standard.

Furthermore, the presence or absence of precipitation of resin powder in the insulating paint used in each Example and Comparative Example was observed after standing for 12 hours.

The results are shown in Table 1.

As is clear from Table 1, when using a mixed resin powder of PTFE and PE whose specific gravity is limited to 0.98 to 111, the lubrication properties are equivalent to or higher than those used alone. It can be seen that the paint has good properties such as hardness and abrasion resistance, improved finished appearance, and good stability of the paint.

[Effects of the Invention] As explained above, the insulated wire of the present invention has one or more insulating layers, and the outermost insulating layer has a specific gravity of 0.98
Since it is made by adding powder of a mixed resin of limited tetrafluoroethylene and polyethylene of ~111, it has high lubricity and wear resistance, and the resin powder is uniformly dispersed in the insulating layer, making it a good material. It will give an appearance. In addition, the storage stability of the insulating paint to which the resin powder is added is also improved.

Claims (1)

[Claims] It has one or more insulating layers, and a powder made of a mixed resin of polytetrafluoroethylene and polyethylene and having a specific gravity in the range of 0.98 to 1.11 is added to the outermost insulating layer. An insulated wire characterized by: