JPS5847801B2 - Jikojiyunkatsusei Enamel Settsuendensen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an enameled insulated wire with excellent self-lubricating properties.

In recent years, in order to rationalize the manufacturing process of electrical equipment, coil winding work has been transitioning from conventional manual winding work to high-speed mechanical winding work using automatic winding machines.

However, when this automatic winding machine is used, the wire is wound under strong tension, bending, friction, etc., so the insulating layer is extremely susceptible to damage. is limited.

When forming a single coil, it is effective to make the space carrier as small as possible for the economical efficiency of the entire device and for ease of use, and for this reason, it is necessary to apply tension to the wire and wind it tightly. be.

In order to further rationalize the structure of the coil, attempts have been made to omit the thin insulating material such as insulating paper between the coils in the motor, or the insulating material between the layers of the voltage transfer device.In this case, the coil/L4. There is a greater possibility that abrasion of the insulating layer of the wire during processing will lead to equipment accidents.

As described above, there is a need to develop an enamel insulated wire that has self-winding properties and self-lubricating properties that can reduce the number of empty wheels during coil forming, and attempts have been made recently to do so.

Currently, polyvinyl formal and polyester wires are most often used as enameled insulated wires used as magnet wires for electric motors, transformers, etc., since they are low in cost from the viewpoint of paint raw material costs and workability during wire manufacturing.

In particular, polyester wire has good heat resistance and is advantageous in terms of downsizing equipment, so the demand for it will increase rapidly.

However, these enameled wires are unsuitable for the above purpose because the coating has a low coefficient of friction (particularly polyester wires have extremely poor mechanical strength).

Therefore, in order to solve these drawbacks, the conventional method has been to apply a lubricating liquid such as liquid paraffy 4 or machine oil to the surface of the enameled wire to reduce wear and tear during machining.
Satisfactory results are not always obtained, and electrical equipment obtained using this method has low F characteristics due to adhesion of foreign matter.
For this reason, solid lubricants such as solid paraffin, which makes it difficult to uniformly apply the lubricant, are also used, but these are also not satisfactory.

On the other hand, as an enameled wire that has improved the above-mentioned drawbacks, an enameled wire manufactured by applying a polyamide resin paint with a small friction coefficient on a conventional enameled wire and a method of applying an emulsion solution of solid lubricant and coagulant has been adopted. has been done.

However, since this enameled wire is coated on top of the conventional enameled wire during the manufacturing process, the coating equipment is complicated, production efficiency is low, and the characteristic low F due to the upper layer coating is observed. However, this cannot be said to be satisfactory.

In view of the above points, the present inventors conducted intensive research into the development of self-lubricating enameled insulated wires, and found that sorbitan was used as a surfactant in conventional baking-type resin paints such as polyvinyl formal, polyester, and polyesterimide. Electric wires are made by applying and baking an insulating paint containing a compound selected from the group consisting of fatty acid esters, alkylphenol type phosphate esters, glycerol boric acid fatty acid esters, and derivatives thereof, directly onto the conductor or through another insulator. The present invention was achieved by discovering that it is possible to manufacture a tight coil with a small coefficient of friction, excellent automatic winding properties, and a small space factor, which is superior to conventional enamelled wire. Ta.

In the specification of the present invention, "surfactant" refers to fatty acid esters of sorbitan, alkylphenol type resins, etc.
Refers to a compound selected from the group of acid esters, glycy-7-boric acid fatty acid esters, and derivatives thereof.

Therefore, the self-lubricating enamel insulated wire of the present invention is coated with 0.05 to 5 parts by weight of interfacial active agent per 100 parts by weight of the resin of the baking-type electrical insulation paint, either directly on the conductor or through another insulating layer. It is characterized by being constructed by applying and baking a J-d self-adhering insulating paint.

Examples of the fatty acid ester of sorbitan or its derivatives used in the present invention include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan monotrioleate, polyoxyethylene sorbitan monolaurate, and polyol. Examples of the glycerol boric acid fatty acid ester include polyoxyethylene monopalmitate, polyoxyethylene monostearate, holoxyethylene monooleate, polyoxyethylene monotrioleate, and the like.

The amount of the surfactant added in the insulated wire of the present invention is 0.000 parts by weight per 100 parts by weight of the resin content of the electrical insulation paint. 0 5～
The reason for this is that if more than 5 parts by weight is added, the appearance of the baked film obtained will be abnormal, and 0.5 parts by weight will be added.
This is because if less than 0.5 parts by weight is added, the effect of imparting lubricity to the film will be diminished, which is inappropriate.

Since the self-lubricating property that is the object of the present invention is caused by the condition of the surface of the insulating layer, it is sufficient to form only the top layer with a surfactant-containing paint when forming the insulating layer. This also complicates the manufacturing process of the electric wire, so it is highly preferable to use the entire coating as a surfactant-containing coating to take advantage of its characteristics.

Next, the present invention will be explained with reference to Examples and Comparative Examples.

Production examples of paints used in simultaneous injection examples and comparative examples will be described as reference examples.

In the examples, all amounts shown are parts by weight.

Reference Example 1 Polyester resin paint 0.9 mol of dimethyl terephthalate, 0.1 mol of dimethyl isophthalate, 2 mol of ethylene glycol, and 0.4 mol of glycerin were mixed at 100% by using lead acetate as a reaction catalyst.
The reaction was carried out at 180°C, then the temperature was increased to 130'C.
The reaction system was depressurized and raised to 190°C in about 2 hours. When the product became viscous, it was dissolved with cresol, tetrabutyl titanate solvent naphtha was added, and the resin content was reduced to 36. got the fee.

Reference Example 2 Water-soluble polyester resin paint As a water-soluble polyester resin paint, WSPE-LOOT manufactured by Nitto Electric Industry Co., Ltd. was made to have a resin content of 35 using ion-exchanged water.

Reference Example 3 Polyurethane Paint A commercially available polyurethane paint TPU-F-2-40 (manufactured by Tokyo Tokushu Electric Wire Paint Co., Ltd.) with a resin content of 39 was used.

Reference example 4 Formal paint: 100 parts of formal resin Vinylesoku FL type (manufactured by Chisso Corporation), 40 parts of phenolic resin AP-107 (manufactured by Gunei Chemical Industry Co., Ltd.), and Coronate AP stable (manufactured by Gunei Chemical Industry Co., Ltd.).
20 parts of Nippon Polyurethane Industries Co., Ltd.) and butylated melamine resin Supervesocamin J-820 (manufactured by Nippon Reichhold Co., Ltd.) were mixed with cresol and solvent naphtha lm to prepare a formal paint with a resin content of 22 parts.

Reference Example 5 Esterimide Resin Paint A commercially available esterimide paint Isomisodo RL (manufactured by Nippon Schenectaday Co., Ltd.) with a resin content of 27 was used.

In the following Examples F, each of the resin paints obtained in Reference Examples 1 to 5 above was applied and baked several times on a copper wire with a diameter of 1.0 m to form an insulating film of approximately 45 μm. An example of manufacturing insulated wire is shown below.

Example 1 A paint containing 100 parts of the polyester resin paint of Reference Example 1 and 0.3 part of an anionic surfactant, Gafac-RF, -610 (alkylphenol type phosphate ester manufactured by Toho Chemical Industry Co., Ltd.), was prepared with a diameter of 1.0 coated copper wire 6 times and baked to obtain an enameled insulated wire of approximately 45 μm.

Example 2 Sorpon T was added to 100 parts of the polyester resin paint of Reference Example 1.
An insulated wire having an insulating film of about 45 μm was obtained in the same manner as in Example 1 using a paint containing 0.05 part of -80 (polyoxyethylene sorbitan monooleate manufactured by Toho Chemical Industries, Ltd.).

Example 3 A paint prepared by blending 1.5 parts of Sorpon T-80 with 100 parts of the water-soluble polyester resin paint of Reference Example 2 was coated with a diameter of 1.5 parts. O
It was coated and baked 7 times on rrvn copper wire to obtain an enameled wire of about 45μ.

Example 4 An insulating film of approximately 45 μm was formed in the same manner as in Example 1 using a paint containing 0.5 parts of sorbitan monooleate (Sorpon S-80, manufactured by Toho Chemical Industry Co., Ltd.) in the paint 101 of Reference Example 3. I obtained an insulated wire with .

Example 5 Polyoxyethylene glycera was added to 100 parts of the paint of Reference Example 4.
- An enameled electric wire having an insulating film of about 45 μm was obtained in the same manner as in Example 1 using a paint containing 0.7 parts of Luporate Olate (Emalbon T80, manufactured by Toho Chemical Industry Co., Ltd.).

Example 6 Using a paint obtained by blending 1 part of polyoxyethylene rubitan tristearate with 100 parts of the paint of Reference Example 5, an enameled insulated wire with an insulating film of about 45μ was produced in the same manner as in Example 1. Obtained.

Comparative Examples 1 to 5 Enamel insulated wires were made in the same manner as in Reference Examples 1 to 5 (Comparative Examples 1 to 5) without adding a surfactant to the paint.

Comparative Examples 6 to 10 Reference Example 1 (Comparative Example 6), Reference Example 2 (Comparative Example 7), Reference Example 3 (Comparative Example 8), Reference Example 4 (Comparative Example 9), and Reference Example 5
(Comparative Example 10) was used to form a film with a thickness of about 40 μm, and on top of that, polyamide (CM3001 manufactured by Toray Industries, Inc.) was dissolved in cresol to give a resin content of 12%, and a film with a thickness of about 5 μm was formed. Five types of insulated wires with coatings were made.

Next, test results of various characteristics of each insulated wire obtained in Examples and Comparative Examples are shown in the table below.

As is clear from the table above, the insulated wire of the present invention has properties that are comparable to those of conventional enamel insulated wire, and it also has much superior self-lubricating properties. We are confident that the rationalization requests will be fully satisfied.

Claims (1)

[Claims] 1. A compound selected from the group of fatty acid esters of sorbitan, alkylphenol type phosphate esters, glycerol borate fatty acid esters, and derivatives thereof is added in an amount of 0.05 to 100 parts by weight of the resin content of the baking type electrical insulation paint.
A self-lubricating enamel insulated wire, characterized in that it is constructed by applying and baking an insulating paint containing 5 parts by weight onto a conductor directly or through another insulating layer.