JP2001135155A - Self-welding wire and multicore self-welding wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a now-self-welding wire and a multicore self-welding wire, superior in adhesive strength and thermal deformation resistance and less in distortion after coil molding. SOLUTION: A resin composition mainly containing a copolymer polyamide resin having a softening point of 100-160 deg.C and a recrystallization temperature of 80 deg.C or higher after softening is solved in an organic solvent to form a self-welding paint. The self-welding paint is applied and baked onto a conductor 2 directly or via an insulating layer 3. A self-welding wire 1 obtained in such a way is used to form a deflecting yoke coil 5, having high quality and quite low distortion after coil molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fusing wire and a multi-core self-fusing wire mainly used for winding a deflection yoke coil of a television receiver or a display device.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube system which is frequently used as a display device of a television, a personal computer or the like includes a deflection yoke coil in which various enamel wires are wound in order to converge and scan a beam emitted from an electron gun. It is known that the deflection yoke coil has a great effect on the brightness, distortion, color shift, and the like of the displayed image, depending on the characteristics and quality of the enamel wire used.

The deflection yoke coil is formed by winding an enamel wire directly on a resin bobbin generally called a separator, or by winding a saddle-type bobbinless coil using a self-fusing wire. Although the method is roughly classified into a method of attaching to a separator, the latter method is now mainstream from the viewpoints of progress in manufacturing equipment and productivity.

In a manufacturing process of a deflection yoke coil using the self-fusing wire, first, a self-fusing wire having a conductor coated with a fusion resin is wound around a mold, and electricity is applied between coil ends. After flowing and heating by heating, the fused resin is softened and formed into a predetermined shape by pressing. Next, a method of cooling with air or the like in a state of being fixed in a mold and discharging the coil in a solidified state to obtain a bobbin-less coil is generally widely used.

[0005]

The self-fusing wire used in the deflection yoke coil is formed by coating an insulating resin paint having a temperature index of 155 to 180 ° C., for example, a polyesterimide resin or a direct solder on the conductor. After coating and baking a possible modified polyesterimide resin to form an insulating layer, a resin composition mainly composed of a thermoplastic resin such as a phenoxy resin or a copolymerized polyamide resin is dissolved in an organic solvent on the insulating layer. Those having a self-fusing layer formed by applying and baking a self-fusing paint are often used.

However, the phenoxy resin forming this self-fusion layer has the advantage that the coil forming distortion of the deflection yoke coil is small, but the flowability at the time of heating and melting is low. Has low adhesive strength. Further, since the softening temperature is lower than that of a polyamide resin or the like, there is a disadvantage that the heat-resistant deformation property is poor.

Therefore, as a method for improving the adhesive strength, a method of polymer blending an epoxy resin or a novolak phenol resin into a phenoxy resin may be considered. However, since these added resins are relatively low molecular substances,
There is a problem that the coil forming distortion becomes large, the heat deformation resistance is reduced, and the advantage of the phenoxy resin is offset. Also, as a measure to improve the heat deformation resistance,
Although it is conceivable to use a phenoxy resin structure in which part of the phenoxy resin structure is replaced with halogen such as bromine from hydrogen, there is a possibility that the resin structure may become an environmentally harmful substance, and practical use is difficult. Similarly, a resin having a sulfone group introduced therein has also been proposed, but the fluidity of the resin at the time of heating and melting is not improved, and the adhesive strength is inferior.

On the other hand, the copolymerized polyamide resin has excellent adhesive strength due to the high fluidity of the resin at the time of melting by heating, and the softening temperature of the resin can be relatively easily synthesized. A resin having a temperature of 160 ° C. is most frequently used as a resin for a self-bonding wire.

[0009] However, this copolymerized polyamide resin has a drawback that the coil molding distortion immediately after the coil production is large, and this distortion progresses temporally. That is, the coil forming distortion of the deflection yoke coil lowers the workability at the time of attaching to the separator, and also emphasizes the bias of the magnetic field after attaching to the display, and as a result, the fineness, distortion, and color shift of the displayed image. (Misconvergence) and the like, it is an indispensable technical problem how to reduce coil forming distortion.

Accordingly, the present invention has been devised in order to effectively solve such problems, and it is an object of the present invention to provide a novel adhesive having excellent adhesive strength and heat-resistant deformation, and having a small distortion after coil forming. A self-welding wire and a multi-core self-welding wire are provided.

[0011]

In order to solve the above problems, the present invention mainly comprises a copolymerized polyamide resin having a softening temperature of 100 to 160 ° C and a recrystallization temperature after softening of 80 ° C or more. A self-fusing paint in which a resin composition is dissolved in an organic solvent is formed, and the self-fusing paint is applied and baked directly on a conductor or via an insulating layer.

By using such a self-bonding wire, it is possible to improve the adhesive strength and the heat-resistant deformation property and to significantly improve the coil forming distortion.

That is, as a result of exploring the above problems in detail, the present inventors focused on the manufacturing process of the deflection yoke coil and the physical properties of the fusion resin of the self-welding wire, and found that the coil forming distortion was reduced by the deflection yoke coil discharge. It was found that the temperature greatly depends on the coil temperature at the time and the recrystallization temperature of the copolymerized polyamide resin. Specifically, if the copolyamide resin is not recrystallized at the coil temperature at the time of coil ejection in the manufacturing process of the deflection yoke coil, the initial coil forming distortion is caused by the coil winding and residual stress at the time of forming. It was found that while the recrystallization proceeds, the coil forming strain also progresses with time.

[0014] From such a point of view, a copolymerized polyamide which softens at the coil temperature at the time of energization bonding, has a softening temperature higher than the required heat-resistant deformation temperature, and crystallizes at the coil temperature at the time of coil discharge. With the use of resin, the initial coil forming strain was greatly reduced, and the idea that it was possible to reduce the temporal coil forming strain was also reached, leading to the present invention as described above. is there.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a self-bonding wire 1 according to the present invention. In the figure, reference numeral 2 denotes a conductor, 3 denotes an insulating layer formed on the conductor 2, and 4 denotes an insulating layer. This is a self-fusion layer formed on the layer 3.

The self-fusion layer 4 has a softening temperature of 100 to
A self-fusing paint obtained by dissolving a resin composition mainly composed of a copolymerized polyamide resin having a recrystallization temperature of 80 ° C. or more at 160 ° C. after softening in an organic solvent is applied through the insulating layer 3 and baked. By having the self-fusing layer 4 having such a composition, the adhesive strength and the heat deformation resistance are improved, so that the initial coil forming distortion after winding is greatly reduced, and It is possible to obtain the self-bonding wire 1 capable of reducing the coil forming distortion.

Here, the lower limit of the softening temperature of the copolyamide resin contained in the self-fusion coating material forming the self-fusion layer 4 is limited to 100 ° C. because of the heat resistance required for the deflection yoke coil. This is because a temperature of at least 100 ° C. is required. On the other hand, the upper limit is limited to 160 ° C., at a temperature exceeding 160 ° C., when conducting current bonding of the deflection yoke coil, an energizing current,
This is because the energization voltage needs to be increased, and the insulating film of the self-bonding wire 1 may be thermally degraded, or may cause insulation failure in some cases. If the energization time is increased to prevent thermal degradation, the productivity of the deflection yoke coil will decrease.

The reason why the recrystallization temperature is set to 80 ° C. or higher is that the coil temperature at the time of coil ejection in the manufacturing process of the deflection yoke coil is about 40 to 50 ° C. at the surface temperature and exceeds 70 ° C. at the maximum in the internal temperature. If the copolymerized polyamide resin does not recrystallize at a temperature higher than this temperature, the effect of reducing coil forming distortion cannot be expected.

Incidentally, such a copolyamide resin is
For example, after measuring the softening temperature by the DSC method,
It can be easily determined by cooling at a temperature of 0 ° C. and measuring the recrystallization temperature.

Specific examples of the copolyamide resin satisfying these conditions include MX2441 / 1.6S
F, MX2441F, MX2447 (all trade names of Elf Atochem) and the like, and these can be used alone or in combination. In addition, even if the copolymer polyamide resin does not satisfy the temperature conditions,
Addition of an additive such as a crystal nucleating agent promotes crystallization, and any material that satisfies the above conditions can be used.

The organic solvent for dissolving the copolymerized polyamide resin is not particularly limited, but isomers of each isomer of phenol, m-cresol, o-cresol, p-cresol and xylenol are used alone. Or a mixed solvent thereof, an aliphatic hydrocarbon as a diluent,
It is preferable to use a mixture with an aromatic hydrocarbon.

In the self-fusing wire 1 of the present invention,
A lubricant may be added to the fusion coating to impart lubricity, or a lubricant may be applied to the surface thereof. In this case, usable lubricants are not particularly limited. For example, besides resins such as polyethylene resin, polypropylene resin, polyester resin, and fluororesin, beeswax, whale wax, wood wax, ozokerite, and carna Uba wax, jojoba oil, lanolin, montan wax, ceresin, candelilla wax, natural wax such as rice wax, paraffin wax, sasol wax, synthetic wax such as ester wax, etc., can be used alone or You may use it combining multiple.

On the other hand, as the insulating layer 3, a polyesterimide resin, a modified polyesterimide resin,
Any of the modified polyester resins or a combination of these resins may be used, but the insulating layer 3 is not always necessary, and may be omitted in some cases, and the self-fusion layer 4 may be directly connected to the conductor 2. It may be applied and formed on top.

A coil may be manufactured by winding the self-fusing wire 1 alone, but a plurality of self-fusing wires may be previously formed for the purpose of suppressing the coil temperature due to high frequency and environmental temperature during use. The coil may be manufactured using a so-called multi-core self-fusing wire obtained by twisting or bundling the wires 1.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described.
The present invention is, of course, not limited to these examples.

Example 1 First, a stirrer, a thermometer, and a reflux condenser were attached to a 2000-cc capacity round-bottom flask, and then the melting point was 135 ° C. and the recrystallization temperature was 95 ° C. Is a copolymerized polyamide resin (MX2
441: 150 g of Elf Atochem), 510 g of m-cresol, and 340 g of xylene, and 80-1
The mixture was stirred at a temperature of 20 ° C. for 3 hours, and then cooled to 30 to 40 ° C. to obtain a self-fusion coating having a nonvolatile content of 15%.

Next, the self-fusing paint thus obtained was finished in a baking furnace having a furnace length of 2 m, under conditions of a furnace temperature of 400 ° C. and a linear velocity of 31 m / min, with a conductor diameter of 0.32 mm and a finish. Coating and baking were performed four times on a polyesterimide wire having an outer diameter of 0.36 mm to obtain a self-bonding wire having a fusion film thickness of 0.01 mm.

Then, two self-fusing wires thus obtained were prepared, and a deflection yoke coil winding machine (SUPER-VH2, manufactured by Nittoku Engineering Co., Ltd.) was used in an atmosphere at room temperature of 25 ° C. and a relative humidity of 45%. , A conduction current of 200 V, a conduction time of 1.5 seconds, and a cooling press time of 22
The deflection yoke coil 5 as shown in FIG. 2 was wound on a die under the condition of seconds.

Thereafter, the deflection yoke coil 5 is taken out of the mold, and the amount of twist 9 is measured immediately using a horizontal plate 8 as shown in FIG. 3, and then the deflection yoke coil 5 is left at room temperature. , The amount of twist 9 is changed at regular intervals (2
(4 hours, 48 hours, 72 hours, 168 hours). The measurement results are shown in the column of Example 1 in Table 1 below.

Example 2 A copolymerized polyamide resin (MX244) having a melting point of 137 ° C. and a recrystallization temperature of 94 ° C.
7: manufactured by Elf Atochem Co.) except that a self-fused wire was produced in the same manner as in Example 1 and its twist was measured by the same measuring method. The measurement results were shown in Table 1 below. This is shown in the column of Example 2.

Example 3 A copolyamide resin (MX244) having a melting point of 137 ° C. and a recrystallization temperature of 94 ° C.
7: 146 g of Elf Atochem), 4 g of novolak phenol resin (Hitanol H1133: Hitachi Chemical Co., Ltd.), 510 g of m-cresol, and xylene 340
Except for using g, a self-bonding wire was produced in the same manner as in Example 1, and its twist was measured by the same measuring method.
The measurement results are shown in the column of Example 3 in Table 1 below.

Comparative Example 1 A copolymerized polyamide resin having a melting point of 127 ° C. and a recrystallization temperature of 70 ° C. (X7079:
A self-bonding wire was manufactured in the same manner as in Example 1 except that Daicel Huls Co., Ltd. was used, and the twist was measured by the same measuring method. This is shown in column 1.

(Comparative Example 2) A copolymerized polyamide resin having a melting point of 123 ° C. and a recrystallization temperature of 59 ° C. (M1422:
Elf Atchem Co., Ltd.) was used to produce a self-bonding wire in the same manner as in Example 1, and the torsion was measured by the same measurement method. This is shown in column 2.

(Comparative Example 3) Self-melting was performed in the same manner as in Example 1 except that a copolymerized polyamide resin (T470: manufactured by Daicel Huls) having a melting point of 106 ° C and a recrystallization temperature of 59 ° C was used. Along with manufacturing the wire, the twist was measured by the same measuring method, and the measurement result is shown in the column of Comparative Example 3 in Table 1 below.

[0036]

[Table 1]

As can be seen from Table 1, the deflection yoke coils of Comparative Examples 1 to 3 each comprising a self-bonding wire using a copolyamide resin having a recrystallization temperature of less than 80 ° C. The torsion immediately after being discharged from the mold was large, and immediately after being discharged, the torsion progressed chronologically, and the amount of change increased. For example, in the case of Comparative Example 1, twisting had already occurred by 0.53 mm immediately after discharge, and this twisting did not easily stop even after a lapse of time.

On the other hand, in the deflection yoke coil comprising a self-fusing wire according to the present invention using a copolymerized polyamide resin having a recrystallization temperature of 80 ° C. or higher, Examples 1 to 5 were used.
As shown in column 3, although slight twisting occurred immediately after being discharged from the mold, the amount of each was in Comparative Examples 1 to 3.
3, and the change with time was very small. For example, in the case of Comparative Example 1, the amount of twist immediately after discharging was only 0.20 mm, which was 1/3 or less of that of Comparative Example 3. In addition, the time-dependent twist change stops at about 48 hours of measurement in Examples 2 and 3, and stops at about 78 hours of measurement in Example 1, and thereafter changes little. I never did.

Further, the adhesive strength of the coil was good, and an adhesive strength equal to or higher than that of the conventional self-bonding wire was obtained.

[0040]

In summary, the self-bonding wire of the present invention exhibits excellent effects such as excellent adhesive strength and heat deformation resistance, and extremely small distortion after coil forming. Therefore,
In the deflection yoke coil formed by such a self-bonding wire, not only the coil forming distortion immediately after being discharged from the mold is extremely small, but also there is almost no time-dependent twisting, so that high quality is obtained. A simple deflection yoke coil can be easily provided.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing one embodiment of a self-fusing wire according to the present invention.

FIG. 2 is a perspective view showing a deflection yoke coil formed in the present embodiment.

FIG. 3 is an explanatory diagram showing a method for measuring the twist of the deflection yoke coil employed in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-fusing wire 2 Conductor 3 Insulating layer 4 Self-fusing layer 5 Deflection yoke coil 6 Rear flange 7 Front flange 8 Horizontal plate 9 Twist amount

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Sekine 108-8 Sayamagahara Matsubara, Iruma-shi, Saitama F-term (reference) in Hanashima Electric Wire & Cable Co., Ltd. Saitama Factory 5G305 AA02 AB24 AB34 BA09 BA25 BA26 BA29 CA11 CA20 CA21 CA22 CA51 CA55 CD15 DA22 5G309 CA04 CA05 MA02 MA04 MA11 MA16 NA03

Claims (5)

[Claims] 1. A self-fusing coating in which a resin composition mainly composed of a copolymerized polyamide resin having a softening temperature of 100 to 160 ° C. and a recrystallization temperature after softening of 80 ° C. or higher is dissolved in an organic solvent. A self-fusing wire obtained by applying and baking the self-fusing paint directly on a conductor or via an insulating layer. 2. The self-fusing wire according to claim 1, wherein a lubricant is dissolved or dispersed in the self-fusing paint. 3. The self-bonding wire according to claim 1, wherein a lubricant is applied to the surface. 4. The self-bonding wire according to claim 1, wherein the insulating layer is any one of a polyimide resin, a modified polyesterimide resin, and a modified polyester resin. 5. A multi-core self-fusing wire comprising a plurality of self-fusing wires according to any one of claims 1 to 4, twisted or bundled.