JPH11306865A - Self-fusible insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adhesive force with the magnet wire of a deflection coil from being deteriorated in actual use by including a specified quantity of an antioxidant in a polyamide resin. SOLUTION: This insulated wire has a fused film, formed of a polyamide resin containing an antioxidant as an outermost layer. The content of the antioxidant is set to 0.3 pts.wt. or more and 5.0 pts.wt. or less with respect to 100 pts.wt. of the polyamide resin. As the antioxidant, a phenolic antioxidant is preferably used. More specifically, IRGANOX 1098 (Registered trademark) is cited as an example, from the viewpoint of high compatibility with the polyamide resin. The fused film is formed of a coating material, consisting of the polyamide resin and antioxidant dissolved in an organic solvent. As the organic solvent, a mixed solvent of cresol and xylene is satisfactory from the viewpoint of solubility and cost. This insulated wire is manufactured by applying the coating material for forming the fused film on a crude wire followed by backing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fusing insulated wire used for manufacturing a coil such as a deflection yoke used for a television receiver or a computer display.

[0002]

2. Description of the Related Art In a self-fusing insulated wire having a fusion coating formed directly on a conductor or via an insulation coating, an outermost fusion coating is dissolved or swelled by current heating or solvent treatment after coil winding. However, since the wires can be fused and solidified, it is possible to easily produce a self-supporting coil. As described above, the self-fusing insulated wire can omit the step of impregnating the insulating varnish or the like, thereby increasing the productivity of the electric device coil and reducing the manufacturing cost. It is widely used as a magnet wire. In recent years, in electrical equipment,
In order to meet demands for miniaturization of coils, improvement in heat resistance, increase in voltage, increase in frequency, improvement in space factor, and the like, self-fusing insulated wires that maintain excellent heat resistance even at high temperatures are desired.

[0003] Conventionally, epoxy resin coatings, polyamide resin coatings and the like have been used as self-fusing paints used for molding this kind of self-fusing insulated wires. In particular, self-fusing insulated wires made of polyamide resin paint are widely used because they exhibit good adhesive strength when coiled, bonded, and pressed.

However, a coil formed by a self-fusing insulated wire obtained by applying and baking a conventional paint containing a polyamide resin as a main component on the insulated wire is used when incorporated in a deflection yoke or the like. In addition, there is a problem that the heat generated during use lowers the adhesive force between the magnet wires in the coil. The coil having the reduced adhesive strength has a drawback that the lines are easily separated from each other, which causes a color shift (misconvergence) on the screen.

In order to solve these problems, it has been considered to use a resin having a high heat resistance (thermal softening temperature) as a self-fusing resin. Since the adhesiveness is deteriorated, it is necessary to set a higher fusion temperature, and there is a problem in that heat fusion equipment during coil molding, the temperature is increased, the energy is increased, and the insulating layer is thermally deteriorated.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a self-fusing insulated wire obtained by applying a paint containing a polyamide resin as a main component on an insulated wire and baking the same. The purpose of the present invention is to solve the problem that the adhesive force between magnet wires of a deflection coil formed by using a self-fusing insulated wire is reduced in actual use by preventing thermal degradation of a polyamide resin. It is.

[0007]

According to the present invention, a fusion film made of a polyamide resin containing an antioxidant is formed on the outermost layer, and the content of the antioxidant is 100 parts (weight) of the polyamide resin. Parts, the same shall apply hereinafter), and 0.3 to 5.0 parts of the self-fusing insulated wire (Claim 1), and the antioxidant is a phenolic antioxidant. A self-fusing insulated wire according to claim 1 (claim 2).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The self-fusing insulated wire of the present invention
In the outermost layer, a fused film made of a polyamide resin containing an antioxidant is formed, and the content of the antioxidant is 0.3 parts or more and 5.0 parts or less based on 100 parts of the polyamide resin. It is something that is.

[0009] The fusion coating is formed from a coating material in which a polyamide resin and an antioxidant are dissolved in an organic solvent.

[0010] The polyamide resin is a polymer compound having a main chain formed by repeating acid amide bonds.
For example, a lactam ring-opening polymer, a condensed polymer of a dibasic acid and a diamine, and the like can be mentioned. Further, a combination of two or more of the lactam, dibasic acid and diamine is also used as a copolymerized polyamide resin.

Examples of the polyamide resin include ring-opened polymers of lactam such as nylon 6 obtained by ring-opening polymerization of ε-caprolactam; nylon 66 by condensation polymerization of hexamethylenediamine and adipic acid; hexamethylenediamine and sebacine. Polycondensates of dibasic acids and diamines such as nylon 610 by condensation polymerization of acids; Nylon 11 by condensation polymerization of 11-aminoundecanoic acid; Nylon by ring-opening polymerization of ω-laurolactam or condensation polymerization of 12-aminodecanoic acid 12; Copolyamide resins obtained by combining two or more of the above-mentioned lactams and dibasic acids with diamines. Among them, the copolymerized polyamide resin is preferable because it exhibits good adhesive strength when molded into a coil.

As a specific example of the copolymerized polyamide resin, Daiamide 43 of Daicel Huls Co., Ltd.
0, 431, 450, 470, X-7079, Elf
Atochem M-1186, H-104, M-142
2, M-1425 and the like.

These may be used alone or in combination of two or more.

The relative viscosity η _{r of the} polyamide resin
0.5% at 25 ° C (% by weight, the same applies hereinafter)
The value measured under the conditions of the meta-cresol solution is 1.4 to 2.
It is preferably 0. When the relative viscosity η _r is less than 1.4, the molecular weight is too small. As a result, the effect of improving the coil deformation prevention at room temperature and high temperature is hardly exhibited. Becomes too large and the paint viscosity increases when it is used as paint.
As a result, the coating baking workability tends to rapidly deteriorate.

The antioxidant is a component used to prevent the polyamide resin used as the fusion coating from being thermally degraded and to prevent the adhesive force between the magnet wires of the deflecting coil from decreasing during actual use.

The antioxidant is not particularly limited as long as it is a generally known antioxidant such as a phenolic antioxidant, a sulfuric antioxidant, a phosphorus antioxidant, and an amine antioxidant. However, a phenolic antioxidant is particularly preferred because of its large antioxidant effect.

Specific examples of the phenolic antioxidants include hydroquinone, hydroquinone monomethyl ether, 2,5-di-t-butylhydroquinone, 2,5
-T-amylhydroquinone, t-butylcatechol,
Styrenated phenol, 2-t-butyl-4-methylphenol, 2,6-di-t-butylphenol, polybutylated bisphenol A, bisphenol A,
2,4,5-trihydroxybutyrophenone, 2,6-
Di-tert-butyl-4-methylphenol, 4,6-di-
t-butyl-2-methylphenol, butylhydroxyanisole, 2,2'-methylenebis (4-methyl-6
-T-butylphenol), 4,4'-methylenebis (2,6-di-t-butylphenol), tris (2-
Methyl-4-hydroxy-5-t-butylphenol)
Butane, 1,3,5-triethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl)
Benzene, tetrakis [methylene- (3 ', 5'-di-
t-butyl-4-hydroxyhydrocinnamate)] methane, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, 1,3,5-tris ( 3,5-di-t-butyl-4
-Hydroxybenzyl) isocyanurate and IRGANOX 2 manufactured by Ciba Specialty Chemicals.
45, IRGANOX 259, IRGANOX 56
5, IRGANOX 1010, IRGANOX 10
35, IRGANOX 1076, IRGANOX 1
081, IRGANOX 1098, IRGANOX
1222, IRGANOX 1330, IRGANOX
Phenolic antioxidants such as 1425WL and IRGANOX B1171. Among these, IRGANOX 1098 is preferable because it has good compatibility with the polyamide resin used as the self-fusing resin.

Specific examples of antioxidants other than the phenolic antioxidants include, for example, dilauryl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipropionate, lauryl-stearyl thiodipropionate, Pentaerythritol-tetrakis (3-laurylthiopropionate), 4,4'-
Thiobis (3-methyl-6-t-butylphenol),
2,2'-thiobis (4-methyl-6-t-butylphenol), bis (3-methyl-4-hydroxy-5-t
-Butylbenzyl) sulfide, and sulfur-based antioxidants such as 2-mercaptobenzimidazole.

The amount of the antioxidant to be added is 0.3 to 5.0 parts, preferably 0.35 to 1.5 parts, per 100 parts of the polyamide resin used as the self-fusing resin. When the amount of the antioxidant is less than 0.3 part, the effect of improving the thermal decomposition resistance of the polyamide resin is hardly exhibited, and when the amount exceeds 5.0 parts, it is used for a self-fusion coating. The solubility in the solvent decreases, and the workability during baking of the paint decreases.

Further, the coating material for forming the fusion coating includes:
In order to provide good lubricity and use as a self-lubricating insulated wire, an appropriate lubricant may be added as long as the effects of the present invention are not impaired.

As the organic solvent for dissolving the polyamide resin and the antioxidant, any of these good solvents can be used without particular limitation. For example, cresol, phenol, xylenol, N-methylpyrrolidone, etc. If so, an alcoholic solvent such as methanol, 2-ethylhexanol and benzyl alcohol can also be used. Further, if necessary, a poor solvent such as solvent naphtha or xylene can be used together with the good solvent. These may be used alone or in combination of two or more. Among these, a mixed solvent in which the weight ratio of cresol to xylene is 40:60 to 90:10 is preferable from the viewpoint of solubility of the polyamide resin and cost.

The solid content of the coating material used to form the self-fusing film is preferably 10 to 25%, more preferably 12 to 22%. The solid content is 10%
When the amount is less than 25%, the coating is baked a number of times to form a target fused film, and the productivity is reduced. When the amount exceeds 25%, the viscosity of the paint is increased. In some cases, the enamel coating workability is rapidly deteriorated, or the enamel coating cannot be uniformly dissolved in the solvent used for the coating.

The self-fusing insulated wire according to the present invention is characterized in that the paint used for forming the self-fusing film is applied to the conductor directly or via another insulating layer and baked to form an outermost layer. This is the one on which an adhesion film is formed. That is, the paint is applied and baked on an electrically insulated wire or a bare wire,
It is manufactured by forming a fusion coating.

As the electric wire on which the fusion coating used for the self-fusing insulated electric wire of the present invention is formed, a conductor using copper, a copper alloy, aluminum, or an aluminum alloy as a conductor, or a polyesterimide or polyurethane , Polyester, polyester imide urethane, polyamide imide, polyimide, polyester amide, polyester amide imide and the like, and an insulating layer provided.

The method of applying the coating material used for forming the self-fusing film on the conductor is not particularly limited as long as it is a commonly known coating method, and examples thereof include a die drawing method and a felt drawing method. And other methods.

The thickness of the fusion coating formed on the self-fusing insulated wire of the present invention varies depending on the type and size of the insulated wire, but is about 5 to 20 μm, generally about 10 μm. When the thickness of the fusion coating is less than 5 μm, an appropriate adhesive force cannot be obtained when the deflection coil is used, and when it exceeds 20 μm, the cost tends to be high.

The self-fusing insulated wire of the present invention is usually wound with a coil, and then heated or subjected to a solvent treatment to melt or melt the fused film for the purpose of obtaining a self-supporting coil. It swells and the lines are self-fused and solidified.

In the deflection coil obtained from the self-fusing insulated wire of the present invention, for example, as shown in FIG. 1, the heat deterioration of the polyamide resin is prevented by the antioxidant, and therefore, the adhesive force between the magnet wires of the deflection coil. The reduction in the actual use is extremely suppressed. FIG.
In the figure, 1 is an electric wire at the beginning of winding, 2 is an upper flange portion, 3 is a winding portion, 4 is a lower flange portion, and 5 is an electric wire at the end of winding.

For example, a polyester imide insulated wire having a conductor diameter of 0.25 mm and an insulation outer diameter of 0.29 mm has a thickness of 10 mm.
The deflection coil obtained from the self-fusing insulated wire on which the fusion coating of the present invention having a thickness of about μm is formed has a molding condition of 220 turns × 3 windings, an energizing time of 3 seconds, an energizing voltage of 190 V, a cooling press of 15 seconds, The adhesive strength (initial adhesive strength) before heating, which was manufactured by winding, fusing, and pressing with a winding machine set at a mold temperature of 40 ° C., as shown in FIG.
８8 N, so that the change with time of the adhesive strength does not become 50% or less of the initial adhesive strength after 20 days under the heating condition of 115 ° C. In FIG. 2, reference numeral 6 denotes a tension gauge.

The self-fusing insulated wire of the present invention is suitably used, for example, as a magnet wire for household electrical appliances, office automation equipment, electrical components and the like.

[0031]

Next, the self-fusing insulated wire of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these.

The evaluation methods in Examples and Comparative Examples are summarized below.

(State of paint) It was visually examined whether or not there was a solid in the paint.

(Thickness of fused film) Minimum scale 1/1000
The finish outer diameter and the insulation outer diameter were measured using a micrometer of mm, and were expressed as の of the difference between the finish outer diameter and the insulation outer diameter.

(Adhesive force) The obtained deflection coil was left at room temperature for 24 hours before heating, and then at 115 ° C. for 5 hours.
After heating for 10 days, 20 days, and 5 days, 10
After 20 days, the adhesive force was determined by measuring the fusion force of one turn inside the deflection coil with a tension gauge. The adhesive force before heating was set to 100, and the ratio (%) of the adhesive force after heating was determined.

Example 1 100 parts of M-1422 (polyamide resin) and IR
GANOX 1098 (antioxidant) 0.4 parts was dissolved in a mixed solvent having a weight ratio of cresol to xylene of 70:30 so that the solid content was 15% (% by weight, the same applies hereinafter). A fusible coating was obtained. The obtained self-fusing paint is applied with a conductor diameter of 0.25 mm and an insulation outer diameter of 0.29 mm.
(Applied by the die drawing method) and baking (furnace length: 3.0 m, furnace temperature: 300 ° C., linear speed: 36 m / min) were repeated three times to obtain a fused film thickness of 10 μm.
m of self-fusing insulated wire was obtained.

The obtained self-fusing insulated wire was subjected to an energizing voltage of 220 V, an energizing time of 3 seconds, and a press time of 15 using a coil winding machine in an atmosphere of 25 ° C. (room temperature) and a relative humidity of 40%.
The workpiece was processed into a deflection coil as shown in FIG. 1 in seconds, and the adhesive force was evaluated as shown in FIG.

Table 1 shows the results of evaluation of the state of the paint, the thickness of the fused film, and the adhesive strength.

Example 2 The procedure of Example 1 was repeated, except that the amount of IRGANOX 1098 was changed to 1.0 part. Table 1 shows the results.

Example 3 The procedure of Example 2 was repeated except that the polyamide resin was changed to X-7079. Table 1 shows the results.

Example 4 The procedure of Example 2 was repeated except that the antioxidant was changed to IRGANOX 1076. Table 1 shows the results.

Comparative Example 1 As a self-fusing paint, a paint obtained by dissolving M-1422 in a mixed solvent of cresol and xylene in a weight ratio of 70:30 so that the solid content becomes 15%. Was performed in the same manner as in Example 1 except that Table 1 shows the results.

Comparative Example 2 As a self-fusing coating material, 100 parts of M-1422 and 0.2 parts of IRGANOX 1098 were mixed in a mixed solvent having a weight ratio of cresol to xylene of 70:30 to a solid content of 15%. The procedure was carried out in the same manner as in Example 1 except that the paint obtained by dissolving as described above was used. Table 1 shows the results.

Comparative Example 3 100 parts of M-1422 and IRGANOX 109
8 5.1 parts by weight of cresol to xylene of 7
An attempt was made to dissolve in a mixed solvent of 0:30 so that the solid content was 15%. However, IRGANOX 1098 did not dissolve uniformly.

Comparative Example 4 The polyamide resin was designated as X-7079, and IRGANOX was used.
The procedure was performed in the same manner as in Example 1 except that the blending amount of 1098 was changed to 0.2 part. Table 1 shows the results.

[0046]

[Table 1]

From the results in Table 1, it was found that a fused film composed of a polyamide resin containing no antioxidant (Comparative Example 1) or containing less than the amount of the present invention (Comparative Examples 2 and 4) was formed. The adhesiveness of the deflection coil obtained from the self-fusing insulated wire decreases over time, and when the content exceeds the range of the present invention (Comparative Example 3), it is difficult to make a paint. It can be seen that it is. On the other hand, the adhesiveness of the deflecting coil obtained from the self-fusing insulated wire formed with a fusion coating made of a polyamide resin containing an antioxidant within the scope of the present invention hardly decreases, or the rate of the decrease is small. It turns out that it is small.

[0048]

The coil manufactured by using the self-fusing insulated wire according to the present invention exhibits excellent heat resistance without substantially lowering the adhesive strength between the coil wires even at a high temperature. Therefore, the self-fusing insulated wire of the present invention is industrially extremely useful.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a deflection coil manufactured using a self-fusing insulated wire.

FIG. 2 is a diagram illustrating a method for measuring the adhesive force of a manufactured deflection coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire at the beginning of winding 2 Upper flange part 3 Winding part 4 Lower flange part 5 Electric wire at the end of winding 6 Tension gauge

Claims (2)

[Claims] An outermost layer is formed with a fusion coating made of a polyamide resin containing an antioxidant, and the content of the antioxidant is 0.3 parts by weight or more based on 100 parts by weight of the polyamide resin. Self-fusing insulated wire characterized by being 5.0 parts by weight or less. 2. The self-fusing insulated wire according to claim 1, wherein said antioxidant is a phenolic antioxidant.