JPH05225831A - Self-fusible insulated wire and coil using such insulated wire - Google Patents

Abstract

PURPOSE:To manufacture an insulated wire to which a self-fusion function is given, by providing a fusible coat mainly of a copolymer polyamide whose melting point and molecular weight are specified, on a conductor through an insulating coat. CONSTITUTION:A fusible membrane mainly of a copolymer polyamide whose melting point is 100 to 160 deg.C, and the molecular weight is 0.95 or higher at the reduction specific viscosity, on a conductor 1 through an insulating coat 2. In this case, polyurethane, polyvinyl formal, polyester, or the like is used as the insulating coat 2, while the copolymer polyamide is the copolymer made by combining and polymerizing a dodecane subacid, aminoundecane acid, adipic acid, sebacic acid, and the like. As a result, an insulated wire which has a self-fusion function can be obtained, and a deflection yoke coil which has a good fusion property and little deformation can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-welding insulated wire in which an enameled wire used for a motor, a transformer, a magnetic coil or the like has a self-fusion function, and a coil manufactured by using the insulated wire. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a coil molded body for electric equipment, communication equipment, etc. has been used in which an insulated electric wire is wound into a predetermined shape and then varnished to bond and solidify the electric wires. Recently, self-fusing insulated electric wires, which can be fused and solidified between electric wires only by heating or solvent treatment, are being used instead of the impregnating varnish treatment.

A self-bonding insulated electric wire is an insulated wire in which a self-bonding coating mainly composed of a thermoplastic material is provided on an insulating coating of an enamel wire, after the insulated electric wire is wound in a coil shape or in a coil shape. When the wire is wound or heated or treated with a solvent, the electric wires are bonded and solidified to obtain a coil, and the impregnating varnish treatment can be omitted, which brings the following advantages to the user. (1) There is no need to worry about pollution and safety and health due to the use of the impregnated varnish. (2) As typified by electric heating, the coil forming cycle is accelerated, and the manufacturing cost is reduced because the impregnating varnish is not used. (3) It is possible to solidify a complex coil shape and a material to which the impregnating varnish does not penetrate.

For this reason, the demand for self-bonding insulated wires is increasing, and to meet the user's process and use conditions,
Development of materials having various characteristics is desired. Among them, the deflection yoke coil used in television etc.
Due to its special shape and dimensional accuracy, many demands have been made from the user side to the winding manufacturer side.

A few years ago, the heating deformation of the coil was small due to the increase of the deflection angle, for example, the coil had a fixing force even at a high temperature of about 100 ° C. Good liquidity is required,
Winding manufacturers have responded by changing the self-bonding material from polyvinyl butyral to copolyamide resin. However, recently, as televisions have become larger and more accurate, the voltage applied to the deflection yoke coil has become higher and the frequency has become higher, and the amount of heat generated by the deflection yoke coil has become higher.
Therefore, the self-bonding material for the deflection yoke coil is required to be able to retain its shape even at higher temperatures.

[0006]

In order to obtain a deflection yoke coil capable of retaining its shape even at a higher temperature, the melting point of the self-bonding material used may be raised. However, when the melting point becomes high, the self-bonding material becomes high. Of the deflection yoke coil, a large current is required when manufacturing the deflection yoke coil by current fusion,
There is a problem that a coil in which the wires are sufficiently adhered to each other cannot be obtained unless the energization time is extended.Therefore, it is desired to develop a self-fusion material that can retain its shape at high temperature, has good fluidity, and is easy to adhere. It is rare.

[0007]

The present invention provides a self-bonding insulated electric wire which solves the above-mentioned problems and is characterized in that its melting point is 100 ° C to 160 ° C via an insulating film on a conductor.
And a self-fusing insulated electric wire provided with a fusion-bonding film containing a copolyamide having a reduced specific viscosity of 0.95 or more as a main component, and a coil manufactured using the insulated electric wire.

FIG. 1 is a cross-sectional view of a specific example of the self-bonding insulated wire of the present invention. In the drawings, 1 is a conductor, 2 is an insulating film, and examples thereof include polyurethane, polyvinyl formal, polyester, polyester imide urethane, polyester imide, polyester amide imide, polyhydantoin, polyamide imide, and polyimide. A multilayer structure can also be used. 3 has a melting point of 100 to 160 ° C and a molecular weight of reduced specific viscosity.
It is a fusion coating mainly composed of a copolyamide of 0.95 or more.

The copolyamide having a melting point of 100 ° C. to 160 ° C. and a molecular weight of reduced specific viscosity of 0.95 or more is adipic acid, sebacic acid, dodecanedioic acid, hexamethylenediamine, cyclohexanediamine, aminocaproic acid, aminoundecanoic acid. , Aminododecanoic acid, ε-caprolactam, δ-valerolactam, ω-laurolactam, and other polyamide resin raw materials are combined and copolymerized so that the melting point is 100 ° C to 160 ° C. 0.95 or more, and specific examples include T-171, T-471, T-371, T-271 and T- manufactured by Daicel Chemical Industries.
571, Nippon Rilsan Co., Ltd. Platabond M-1422, H-10
5 etc.

In the present invention, a copolyamide resin having a melting point of 100 ° C. to 160 ° C. is used because when the melting point is less than 100 ° C., the deformation of the coil obtained from the self-bonding insulated wire after molding is large. However, if the melting point exceeds 160 ° C., the fluidity of the material is poor, and the obtained coil has a low fusion force and does not meet the requirements. The carbon number of dodecanedioic acid, aminoundecanoic acid, aminododecanoic acid, ω-laurolactam, etc.
It is particularly preferable to use a polyamide resin containing 10 or more raw materials as a main component and copolymerized with other components because the fixing force increases.
The melting point may be measured by any method as long as it is commonly used, and examples thereof include DSC and the Cavary method.

In the present invention, the molecular weight is reduced specific viscosity of 0.
The use of a copolyamide having a ratio of 95 or more does not satisfy the requirement because when the reduced specific viscosity is less than 0.95, the deflection yoke coil is largely deformed at high temperature. The reduced specific viscosity is a specific viscosity when a sample is dissolved in a solvent at a temperature of 30 ° C. to a concentration of 0.5 g / 100 cc using a solution viscometer such as Uberote and Ostwald, that is, [(sample solution Falling seconds-solvent dropping seconds) / solvent dropping seconds] / concentration (0.5).

It should be noted that other thermoplastic resins, thermosetting resins, and plasticizers may be used to the extent that they do not adversely affect the properties of the copolyamide resin having a melting point of 100 ° C. to 160 ° C. and a molecular weight of reduced specific viscosity of 0.95 or more. It is possible to improve the electric wire characteristics to some extent by appropriately adding a lubricant, a surfactant, a pigment, a dye, a filler and the like.

The self-bonding insulated wire of the present invention is particularly effective when used for a coil which is fused by heating and requires hardness after fusion, specifically, for a deflection yoke coil. The reason why the self-fusing insulated electric wire of the present invention is excellent in the deformation fusion-bonding property of the coil at high temperature is presumed as follows.

Up to now, in order to reduce the deformation of the deflection yoke coil at high temperature, the melting point of the copolyamide used is increased, and in order to improve the fusion property, the melting point of the copolyamide is lowered, We have responded by increasing liquidity. Therefore, the fusion property and the deformation at high temperature are incompatible with each other due to their contradictory properties. On the other hand, it has been found that when the molecular weight of the copolyamide is reduced to 0.95 or more as in the present invention, the deformation of the obtained deflection yoke coil at high temperature is unexpectedly improved. When the molecular weight is increased, the fluidity is slightly lowered, but the effect of deformation at high temperature is greater, and by adjusting the molecular weight and melting point of the copolyamide, deformation at high temperature and fusion properties that are better than before It is presumed that a film was obtained. Also, the reduced specific viscosity of the copolyamide is
Although it is not clear why 0.95 or more is used for high temperature deformation, the higher molecular weight increases the strength of the film and increases the resistance to deformation of the deflection yoke coil at high temperatures. It is presumed to be a tame.

[0015]

EXAMPLES Next, the present invention will be described in more detail by way of examples. The present invention is not limited to the examples below. Daicel Chemical Co., Ltd. Copolyamide T-450
, T-250, T-470, and a 1/1 mixture of T-450 and T-470 were dissolved in m-cresol so that the resin content was 200%. Each of the obtained paints was A-1
(T-450), A-2 (T-250), A-3 (T-470)
), A-4 (T-450 / T-470 = 1/1). The melting point of each is measured by DSC and the reduced specific viscosity is
Table 1 shows the results of measurement using m-cresol as a solvent at a concentration of 0.5 g / 100 cc at 30 ° C.

[0016]

[Table 1]

(Comparative Example 1) A 0.3 mm soft copper wire was coated with H-type polyester imide (trade name: Isomid RH, manufactured by Nippon Schenectady, Inc.) 8 times, and the paint A-1 prepared above was baked 4 times to form an insulating film A self-fusing insulated electric wire with a 0.020 mm and a fusion coating of 0.010 mm was obtained. (Comparative Example 2) Paint A-2 instead of paint A-1 of Comparative Example 1
Insulating film in the same manner as in Comparative Example 1 except that
A self-fusing insulated electric wire with a 0.020 mm and a fusion coating of 0.010 mm was obtained. (Example 1) Paint A-3 instead of paint A-1 of Comparative Example 1
Insulating film 0.0 in the same manner as Comparative Example 1 except that
A self-fusing insulated electric wire having a 20 mm and a fusion coating of 0.010 mm was obtained. (Example 2) Paint A-4 instead of paint A-1 of Comparative Example 1
Insulating film in the same manner as in Comparative Example 1 except that
A self-bonding insulated electric wire having a 0.020 mm and a fusion coating of 0.010 mm was obtained.

The self-fusing insulated electric wires produced in Examples 1 and 2 and Comparative Examples 1 and 2 were coiled by a deflection yoke coil winding machine to produce the deflection yoke coil shown in FIG. The dimensions of each part are a = 40 mm, b = 90 mm, and c = 60 mm. The fusion force of 1 to 3 turns of the inside portion (d in the figure) of the obtained deflection yoke coil was measured with a tension meter. Further, as shown in FIG. 3, the deflection yoke coil 10 is allowed to stand still on a smooth plate 11, and the gap between the deflection yoke coil and the plate (Δh: take-out deformation)
Was measured. In addition, the deflection yoke coil is
The amount of deformation after standing for 1 day in a constant temperature bath at ℃ was measured in the same manner as above. Table 1 shows the measurement results of the fusion force and the amount of deformation.
Shown in.

[0019]

As described above, according to the self-bonding insulated wire of the present invention, the deformation of the coil and the fusion force are well balanced as compared with the conventional one. Therefore, the deflection yoke coil manufactured by using the self-fusing insulated electric wire of the present invention has good fusion property and little deformation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a specific example of the self-bonding insulated electric wire of the present invention.

FIG. 2 is a vertical sectional view of a deflection yoke coil used in an example.

FIG. 3 is an explanatory diagram of a deformation amount of the deflection yoke coil of the embodiment.

[Explanation of symbols]

 1 conductor 2 insulating film 3 fusion film

Claims (2)

[Claims] 1. A melting point of 100 on a conductor through an insulating film.
A self-bonding insulated electric wire, which is provided with a fusion-bonding film containing a copolyamide as a main component, the molecular weight of which is 0.95 or more in reduced specific viscosity at ℃ to 160 ℃. 2. A coil manufactured using the self-bonding insulated electric wire according to claim 1.