JPH06290643A - Self-welding type magnet wire - Google Patents

Abstract

(57) [Abstract] [Purpose] Suitable for winding of flat motor coils that require aligned winding properties, heat resistance, etc., and can be used for alcohol winding or hot air winding without being affected by the type of winding machine. Provided is a self-bonding magnet wire that can be wound with either of them and prevents the winding jig from becoming dirty. [Structure] To 100 parts by weight of an alcohol-soluble polyamide resin, 15-40 parts by weight of an alcohol-insoluble polyamide resin, 25-35 parts by weight of a phenol resin, and 10-25 parts by weight of a blocked isocyanate resin are added, and this is dissolved in an organic solvent. A self-bonding magnet wire is obtained by coating and baking the coating material on the conductor directly or through an insulating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-bonding magnet wire suitable for obtaining a self-supporting coil, and more specifically, a flat wire used for driving a video tape recorder (VTR), a floppy disk (FD) or the like. The present invention relates to a self-bonding magnet wire suitable for winding a motor coil (hereinafter abbreviated as flat coil).

[0002]

2. Description of the Related Art A self-bonding magnet wire in which a fusion coating is applied and baked on an electric conductor through an insulating film is easily melted, swelled or melted by a solvent treatment or a heat treatment, so that the inter-wire mutual Since it can be fused and solidified, a self-supporting coil can be produced relatively easily, and it is widely used for coil windings having complicated shapes. In coil winding, whether the self-melting magnet wire is solvent-treated or heat-treated is determined by the characteristics of the fusion coating. , Abbreviated as solvent bonding type wire), and those subjected to heat treatment are classified and used as hot air bonding type self-bonding magnet wire (hereinafter abbreviated as hot air bonding type wire).

Polyvinyl butyral resin, phenoxy resin, polyamide resin, etc. are known as the resin used for the fusion coating of the self-bonding magnet wire, but the solvent bonding wire and the hot air bonding type are considered in consideration of the bonding characteristics. Polyamide resin is often used for both wires.

[0004] The fusion coating of the self-fusing magnet wire is dissolved in an alcohol solvent such as methanol or ethanol,
The solvent-bonded wire that adheres after swelling can use a high melting point resin having a heat softening temperature of 150 ° C. or higher for the fusion coating, and can manufacture a coil having good heat resistance.

On the other hand, in the hot air adhesive type wire in which the fusion film of the self-adhesive magnet wire is heated by hot air or the like to be melted and then adhered, the solvent adhesive type wire is used in view of the dimensional accuracy of the flat coil and the aligned winding property. Is better. However, considering the influence on the winding machine, there is a limit to the temperature of the hot air blown onto the wire material, so a low melting point resin having a thermal softening temperature of about 100 to 150 ° C. is used as the resin for the fusion coating.

[0006]

In the conventional solvent-bonding type wire, the melting and swelling of the fusion coating is greatly affected by variations in the coating amount of the alcohol-based solvent applied to the wire. However, there is a problem in that the dimensional accuracy of the coil and the winding property of the coil are likely to change when the wire is wound on the wire.

Further, in the conventional hot air adhesive type wire,
In particular, when this wire is applied to a high-speed coil winding, it is desirable that the fusion film melts at a low temperature and has a good resin flow. However, this lowers the heat resistance of the coil, and there is a problem when the coil after winding undergoes a heat treatment process and when it is used in equipment requiring heat resistance.

In recent years, with the introduction of a fully automatic coil winding machine for the flat coil alignment winding, the self-bonding magnet wire has a small variation in the finished dimensions in addition to the heat resistance of the fusion coating. Is required. Further, in the case of winding a coil, it is required that the coil be excellent in alignment and have high dimensional accuracy. A hot-air-bonding type winding machine (hereinafter referred to as a hot-air winding machine) that winds hot air onto the coil winding machine.
There is a solvent-bonding type winding machine (hereinafter referred to as alcohol winding machine) that winds while applying alcohol. A hot air winding machine is said to be advantageous for fully automatic coil winding, but alcohol winding machines are also used, and it is necessary to use hot air bonding type wire or solvent bonding type wire according to each winding machine. there were.

In the self-bonding magnet wire, when a high melting point alcohol-soluble polyamide resin is used as the main component resin of the fusion coating, it is suitable for an alcohol winding machine but for a hot air winding machine. Not suitable. Also, when a low melting point alcohol-insoluble polyamide resin is used as the main resin of the fusion coating, it is suitable for a hot air winding machine, but is not suitable for an alcohol winding machine because it is insoluble in an alcohol solvent. Is.

In a flat coil aligned winding wire coated with alcohol, if the fusion film has too good swelling or solubility in alcohol, a part of the swollen or dissolved fusion film adheres to the winding jig. Since the outer shape of the fusion coating is likely to change, the coil alignment rate is reduced.
On the other hand, when the swelling degree or the solubility with respect to alcohol is bad, the adhesion between the wires becomes insufficient and the winding cannot be performed.

The present invention has been made in order to solve the problems of the above-mentioned prior art, and has an effect on the type of winding machine in the case of flat coil winding, which requires aligned winding and heat resistance. It is an object of the present invention to provide a self-bonding magnet wire which can be wound with either an alcohol winding or a hot air winding without being damaged, and prevents the winding jig from being soiled.

[0012]

In order to achieve the above object, the present invention is based on 100 parts by weight of an alcohol-soluble polyamide resin, 15-40 parts by weight of an alcohol-insoluble polyamide resin, 25-35 parts by weight of a phenol resin and a blocked isocyanate resin. A self-bonding magnet wire is characterized in that 10 to 25 parts by weight of the composition is added and the composition is melted in an organic solvent and the composition is baked on a conductor directly or through an insulating film.

A self-melting magnet wire using a high melting point resin having a heat softening temperature of 150 ° C. or higher as the alcohol-soluble polyamide resin and a low melting point resin having a heat softening temperature of less than 150 ° C. as the alcohol insoluble polyamide resin. It is in. Further, a self-melting magnet wire using a low melting point resin having a heat softening temperature of less than 150 ° C. as the alcohol-soluble polyamide resin, and using a high melting point resin having a heat softening temperature of 150 ° C. or more as the alcohol insoluble polyamide resin. is there.

In general, in a hot-air type wire in which hot air is blown onto a wire to melt and bond the fusion-bonded film, the fusion-bonded film must be softened and melted by heat to firmly bond the wires. Therefore, the combination of polyamide resins is important. If the alcohol-soluble polyamide resin as the main component has a high melting point, it is difficult to cause heat fusion, and therefore it is necessary to use an alcohol-insoluble polyamide resin having a low melting point. Further, if the main component alcohol-soluble polyamide resin has a low melting point, it is likely to be heat-sealed, so that the selection range of the alcohol-insoluble polyamide resin to be added is wide, but it is necessary to select it in consideration of the heat resistance of the coil. .

The alcohol-soluble polyamide resin, which is the main component of the fusion coating of the present invention, takes into consideration the solubility in alcohol and the heat resistance of the coil, for example, Ultramid 1
C (trade name of BASF, Germany) and Amilan CM4000,
CM4001 (trade name of Toray), Platabond MX1
Resin such as 603 (trade name of Nippon Rilsan Co., Ltd.) is used. Of these alcohol-soluble polyamide resins,
As a high melting point polyamide resin having a heat softening temperature exceeding 150 ° C., Ultramid 1C (melting point 180 to 190
℃), Platabond MX1603 (melting point 190-200
℃). Further, as a polyamide resin having a low melting point having a heat softening temperature of less than 150 ° C., Amilan CM400
No. 0 and CM4001 (melting point 140 to 150 ° C.).

The alcohol-insoluble polyamide resin added to the above alcohol-soluble polyamide resin is added for the purpose of suppressing the alcohol solubility of the fusion coating and adjusting the melting point of the alcohol-soluble polyamide resin so as to improve the fusion property by heat. Specifically, grill amide ELY60, Guriron CR9 (trade name of MMS Japan), Daiamide N1901, L1801 (trade name of Daicel), Platabond M1425, M1426.
(Product name of Rilsan Japan Co., Ltd.) and the like can be mentioned. Among these alcohol-insoluble polyamide resins, high melting point polyamide resins having a melting point of more than 150 ° C. include Grillamide ELY60 (melting point 160 ° C.) and Daiamide L.
1801 (melting point 175-180 ° C), Platabond M1
426 (melting point 195 to 200 ° C.). Further, as the low melting point polyamide resin having a melting point of less than 150 ° C.,
Examples include Daiamide N1901 (melting point 150 ° C.) and Platabond M1425 (melting point 145 to 155 ° C.).

The amount of the alcohol-insoluble polyamide resin added to the alcohol-soluble polyamide resin is 15 to
The reason for limiting the amount to 40 parts by weight is that if the amount is less than 15 parts by weight, the above effect is not observed, and if it exceeds 40 parts by weight, alcohol solubility is impaired and solvent adhesion becomes difficult.

Phenolic resin is a resin added to improve the dryness to the touch of the coating film and to adjust the viscosity of the fusing paint.
An alkylphenol resin such as (Hitachi Chemical Co., Ltd. product name) is used. A blocked isocyanate resin is a resin that is added as a crosslinking agent and contributes to improving the heat resistance of the film. Specific examples thereof include Millionate MS-5, Coronate AP Stable (trade name of Nippon Polyurethane Company) and the like. The amount of the phenol resin added to the alcohol-soluble polyamide resin is 25 to 35 parts by weight, and the amount of the blocked isocyanate resin added is 10 to 25.
The reason why the content is limited to parts by weight is that, in these resins, the above-mentioned effects due to addition are not observed when the content is less than the content by weight, and when it exceeds the content by weight, the adhesiveness of the fusion coating is significantly impaired. is there.

[0019]

[Function] A fusion-bonding coating composed of alcohol-insoluble polyamide resin as a main component, and alcohol-insoluble polyamide resin, phenol resin and blocked isocyanate resin added thereto is coated and baked to form an alcohol-soluble polyamide resin and an alcohol-insoluble polyamide resin. In the resin matrix in which the polyamide resin is entangled with each other, the phenol resin is uniformly distributed at a constant ratio, and the hydroxyl groups of the phenol resin react with the blocked isocyanate resin, so that a crosslink having a network structure having excellent heat resistance is formed.
That is, by adding the blocked isocyanate resin as a cross-linking agent, it is possible to control the magnitude of the intermolecular cross-linking density.

The addition of the alcohol-insoluble polyamide resin and the blocked isocyanate resin has a function of suppressing the swelling degree or the solubility of the fusion-bonded film in the alcohol-based solvent to an appropriate value. Therefore, in the flat coil aligned winding by applying alcohol, the swelling degree or solubility of alcohol of the fusion coating becomes an appropriate value, so that part of the swollen or dissolved fusion coating does not adhere to the winding jig. , Also, the adhesion between the lines is improved. Further, since the outer diameter of the fusion coating does not fluctuate, the coil alignment rate is improved and good winding can be performed.

When a low melting point alcohol-insoluble polyamide resin having a heat-softening temperature of less than 150 ° C. is added to a high-melting point alcohol-soluble polyamide resin having a heat-softening temperature of 150 ° C. or more, a melt composed of the high-melting point alcohol-soluble polyamide resin is added. Since the heat softening temperature of the coating film can be lowered, it is suitable for hot air bonding. Further, the heat softening temperature is 15
When an alcohol-insoluble polyamide resin having a high melting point of 0 ° C. or higher is added to an alcohol-soluble polyamide resin having a low melting point and a thermal softening temperature of less than 150 ° C., the softening melting temperature of a fusion coating made of the alcohol-soluble polyamide resin having a low melting point is increased. Since it can be raised, the heat resistance of the coil is improved.

The phenol resin has an action of preventing adhesion which is likely to occur in the fusion-bonded film made of the polyamide resin, and also acts as a flow regulator of the fusion-bonded film at the time of heating and melting.

[0023]

EXAMPLES The contents of the present invention will be described below with reference to examples and comparative examples. The present invention is not limited to this embodiment. Preparation of Fusion Coatings Table 1 is a resin composition table of the fusion coatings of Examples 1 to 6 and Comparative Examples 1 to 3. Examples 1 to 3: Ultramid 1C was used as the alcohol-soluble polyamide resin, and Daiamide N19 was used as the alcohol-insoluble polyamide resin.
01, Hitanol 1140 as a phenol resin, and Millionate MS- as a blocked isocyanate resin.
50 was added according to the composition table and dissolved in a mixed solvent of cresol and xylol to prepare a fusion coating composition having a concentration of 13%.

Examples 4 to 6: Amylan CM4000 was used as the alcohol-soluble polyamide resin, and Glyron CR9 as the alcohol-insoluble polyamide resin and the same phenolic resin and blocked isocyanate resin as in Examples 1 to 3 were added according to the composition table. Cresol,
It was dissolved in a mixed solvent of xylol to prepare a fusing paint having a concentration of 13%.

Comparative Examples 1 to 3 One type of alcohol-soluble or alcohol-insoluble polyamide resin was used as the main component polyamide resin, to which the same phenolic resin as in Examples 1 to 6 was added according to the composition table, and cresol was added. , Xylol was dissolved in a mixed solvent to prepare a fusion coating composition having a concentration of 13%.

Manufacture of self-bonding insulated wire A copper wire having a conductor diameter of 0.300 mm was coated with a fusing paint of Examples 1 to 6 and Comparative Examples 1 to 3 through a polyurethane film having a thickness of 12 μm to give a finished outer diameter. Apply and bake to 0.334 mm,
The self-bonding magnet wires of Examples 1 to 6 and Comparative Examples 1 to 4 were manufactured. These self-fusing magnet wires were tested based on JIS C 3003 "Enamel copper wire and enamel copper wire test method", and the results are shown in Table 2.

Winding of flat coil Using a single-axis type fully automatic winding machine, the flat coil is blown to the self-bonding magnet wires of Examples 4 to 6 and Comparative Examples 3 and 4 while blowing hot air of about 180 ° C. Was wound. Using the same winding machine as described above, winding of a flat coil was performed while applying methanol to the self-bonding magnet wires of Examples 1 to 3 and Comparative Examples 1 and 2.
Table 3 shows the results of examining the adhesive strength and heat resistance of the flat coil obtained by the hot air winding and the alcohol winding.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

[0031]

As is clear from the characteristics shown in Tables 2 and 3, the self-bonding magnet wire of the present invention has good general characteristics, and the coil alignment rate is higher than that of the conventional self-bonding magnet wire. It is possible to obtain a coil in which the winding jig is not dirty, the adhesive force is strong in both the hot air winding and the alcohol winding, and the heat resistance is good, that is, the thermal deformation is small. In particular,
In the case of the self-bonding magnet wire of the present invention, since the fusion-bonding film is composed of alcohol-soluble polyamide resin as a main component and alcohol-insoluble polyamide resin, phenol resin and blocked isocyanate resin added thereto, it is a winding method. Is not limited, that is, coil winding is possible with either hot air winding or alcohol winding. Therefore, conventionally, the self-bonding magnet wire that can be used is limited depending on the type of the winding machine, but the self-bonding magnet wire of the present invention can be used for both the hot air winding machine and the alcohol winding machine. Therefore, it is extremely large that it contributes to the industry.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location H01B 3/30 M 9059-5G (72) Inventor Shigeya Kazama 300 Oya Oya, Ueda City, Nagano Prefecture Tokyo Special Ueda Factory of Electric Wire Co., Ltd.

Claims (3)

[Claims] 1. An alcohol-soluble polyamide resin 100.
15 to 40 parts by weight of alcohol-insoluble polyamide resin
Parts, 25 to 35 parts by weight of a phenol resin, and 10 to 25 parts by weight of a blocked isocyanate resin were added, and a fusion paint prepared by dissolving this in an organic solvent was applied and baked on a conductor directly or through an insulating film. Characteristic self-bonding magnet wire. 2. The alcohol-soluble polyamide resin is a high melting point resin having a heat softening temperature of 150 ° C. or higher, and the alcohol-insoluble polyamide resin has a heat softening temperature of 15 or more.
A low melting point resin having a temperature of less than 0 ° C. 3.
The self-bonding magnet wire described. 3. The alcohol-soluble polyamide resin is a low melting point resin having a heat softening temperature of less than 150 ° C., and the alcohol-insoluble polyamide resin has a heat softening temperature of 15
A high melting point resin having a temperature of 0 ° C. or higher.
The self-bonding magnet wire described.