KR19990017263A - Insulated wire - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Insulated wire

2. The technical problem that the invention is trying to solve

Provides insulated wire with excellent direct solderability and at least heat resistance superior to conventional polyester resins.

3. Summary of Solution to Invention

In an extrusion coating insulated wire having an extrusion coating insulation layer provided on the outer surface of the conductor directly or through another layer, or on the outer surface of a multi-core wire composed of a collective insulation core or conductor core. The coating insulating layer comprises 100 parts by weight of the resin (A) comprising polyether sulfone resin as an essential component and polyetherimide resin as an optional component, a polycarbonate resin, a polyarylate resin, a polyester resin, and a polyamide resin. Disclosed is an insulated wire made of a resin mixture to be extruded, comprising 10 to 100 parts by weight of a resin (B) comprising one selected from among them. According to the insulated wire in which the insulation layer was formed by the extrusion coating method, it is excellent in direct solderability, at least its heat resistance is superior to conventional polyester resins, and at least the heat resistance grade B prescribed by IEC Standard Publication 172 is easily It has satisfactory heat resistance.

4. Important uses of the invention

Used in transformers of high frequency devices, coils or wires.

Description

Insulated wire

The present invention has a high heat resistance and excellent solderability, because the insulating layer can be removed in a short time so that the solder can be easily fixed to the conductor when the insulated wire is immersed in the solder bath, the wire is particularly high frequency An extruded coated insulated wire having an excellent effect when used in a device, coil or transformer of a wire.

Wire or wire material for high frequency equipment, comprising a predetermined number of twisted and individual buckled strands formed by providing an enamel film 8 on each conductor 7 as shown in FIG. So-called litz wir (6) is used. Litzwire is mainly used in the low voltage section of high frequency equipment. However, when the Ritzwire is wound into a coil shape, the cross section of the conductor is likewise deformed, and the aligned winding becomes difficult. Thus, in such a coil, the deformation of the cross section of the coil adversely affects the aging of the high frequency equipment. On the other hand, when the Litzwire is used in the part where high frequency surge is applied, a high voltage is applied between the ends or layers of the coil. In such a method, a means for ensuring reliability, such as additionally inserting insulating paper between layers, is necessary because in conventional rich wires, the insulating ability is determined by the insulating ability of the insulated strand itself. to be.

In order to solve this problem, the inventors of the present invention proposed an improved insulated wire for high frequency equipment, as shown in FIG. Referring to FIG. 1, the insulated wire 1 is formed of a plurality of enameled insulating strands 2 (integrated by providing an enamel film 5 on the outer circumferential surface of the conductor 4) and ethylene having a carboxyl group. It consists of the coating layer 3 on the outer periphery of the strand 2 formed by the extrusion coating of the thermosetting polyester-type resin modified by the system copolymer (Japanese Patent Application Laid-Open No. 4-10305).

This insulated wire compensates for the drawbacks of the conventional Litzwire, and has the advantage that soldering is possible only by immersing the terminals of the wire in the solder bath. Such insulated wire has already been put to practical use.

However, in recent years, high frequency equipment has become smaller and higher in performance, and in some products, heat resistance of electric wires is unsatisfactory, and such products have increased rapidly. Therefore, improvement in heat resistance has become an important issue.

Therefore, in order to obtain such an insulated wire, the improvement which makes use of selectable high heat resistant material is mainly attempted.

However, the insulated wire provided with the insulating layer of a high heat resistant material has a problem that when the insulating layer is removed for the connection of the terminal, it is very difficult to remove the covering of the insulating layer. This lowers the soldering performance of the insulated wire to the terminal portion and is a major factor for the high reliability of the insulated wire under development. In other words, when a high heat resistant material is used as the material of the insulating layer when the insulating layer is chemically or mechanically removed, the removal conditions are severe, chemicals remain or damage due to mechanical removal is increased, This adversely affects the connection of the terminals. On the other hand, in order to avoid such a problem, if only the connection reliability of the terminal is to be increased, it is difficult to expect the improvement of the heat resistance of the insulated wire.

Moreover, as the diameter of the insulated wire is reduced, the conventional method of removing the insulating layer becomes increasingly difficult to use, and the reliability of the insulated wire is lost.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, to provide excellent direct solderability, at least heat resistance superior to conventional polyester resins, and to at least satisfy the heat resistance class B specified by IEC Standard Publication 172. It is to provide an extrusion coating insulated wire formed by the extrusion coating method, characterized in that it has a heat resistance.

Other and further objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

1 is a cross-sectional view showing an embodiment of the insulated wire of the present invention when the core material is a multi-core stranded wire and an improved type of litz wire;

2 is a cross-sectional view showing a conventional litz wire.

* Explanation of symbols for main parts of the drawings

DESCRIPTION OF SYMBOLS 1 Insulated wire, 2 Enamel insulated strand, 3 Coating layer, 4 Conductor, 5 Enamel film, 6 Ritz wire, 7 Conductor, 8 Enamel film

In order to achieve the above object, various individual heat-resistant resins and mixtures thereof have been extensively investigated. As a result, it was found that certain resin compositions can be extruded very finely and at the same time exhibit good solderability, leading to the present invention. In the resin composition, a resin mixture composed of a heat-resistant resin composed of polyethersulfone resins, which is excellent in heat resistance and has been considered to be poor in soldering, as an essential component, is, in some cases, poly Other heat resistant resins such as etherimide resins and the like may be mixed, and at least polycarbonate resins, polyarylate resins, polyester resins and polyamide resins are included in the resin mixture.

That is, the present invention is a multi-core wire which is provided on the outer surface of the conductor directly or through another layer (existing between the conductor and the insulating layer) or composed of collective (collected) insulation cores or conductor cores. An extruded coated insulated wire having an extruded coated insulating layer provided on an outer surface thereof, wherein the extruded coated insulating layer comprises (A) a polyethersulfone resin as an essential component and a polyetherimide resin as an optional component. It is made of a resin composition composed mainly of a resin mixture comprising 100 parts by weight and 10 to 100 parts by weight of a resin comprising one selected from (B) a polycarbonate resin, a polyarylate resin, a polyester resin, and a polyamide resin. .

Here, among the above-mentioned resins, the polyether sulfone resin can be selected and used from those produced by a known method and generally used. For example, polyethersulfone resins can be prepared by reacting dichlorodiphenyl sulfone, bisphenol S, and carium carbonate in high boiling solvents. Examples of the resins available as commercial products include Victrex PES (trade name, manufactured by Sumitomo Chemical Co., Ltd.), and Radel A. Radel R. Yutel (trade name, manufactured by Amoco).

Similarly, polyetherimide resins prepared by known methods can be used. For example, the polyetherimide resin is 4,4'-diaminodiphenylmethane and 2,2'-bis [3- (3,4-dicarboxyphenoxy) -phenyl] propane in orthodichlorobenzene as a solvent. It can be synthesized by solution polycondensation of diacid anhydride. Examples of commercially available resins include ULTEM (trade name, manufactured by GE Plastics).

Other resin components (B) for use in the present invention as described above, polycarbonate resins, polyarylate resins, polyester resins and polyamides, can be selected and used from those generally used. As polycarbonate resin, what was manufactured by the well-known method using dihydric alcohol, phosgene, etc. as a raw material can be used, for example. Examples of commercially available resins include Lexan (trade name, manufactured by GE Plastics Corporation), Panlite (trade name, manufactured by Tenjin Kagaku Corporation), Eupyron (trade name, manufactured by Mitsubishi Gas Kagaku Corporation), and the like.

In addition, the polyarylate resin is subjected to an interfacial polymerization method in which a mixture of terephthal chloride / isophthal chloride dissolved in an organic solvent such as a halogenated hydrocarbon at room temperature and bisphenol A melted in an aqueous alkaline solution are reacted, for example, at room temperature. It can usually be prepared by. Examples of commercially available resins include U-polymers (trade name, manufactured by Unitika).

As the polyester resin, one produced by a known method using dihydric alcohol, divalent carboxylic acid or the like can be used as a raw material. Resins available for use include polyethylene such as sunpet (trade name, manufactured by Asahi Kagaku Kogyo Co., Ltd.), viropet (trademark, manufactured by Toyobo Co., Ltd.), velpet (trademark, manufactured by Kanebo Corporation), and Teijin PET (trade name, manufactured by Teijin Co., Ltd.). Terephthalate (PET) -based resins; Polyethylene naphthalate (PEN) -based resins such as Teijin PEN (trade name, manufactured by Teijin Corporation); And polycyclohexanedimethylene terephthalate (PCT) -based resins such as actar (trade name Toray Sangyo Co., Ltd.).

Moreover, as a polyamide resin, what was manufactured by the well-known method using diamine, dicarboxylic acid, etc. can be used as a raw material. Commercially available are nylon 6,6 such as, for example, Amiran (trade name, manufactured by Toray Industries), Zytel (trade name, EI Dupont de Nemours Company), and maranyl (trade name, manufactured by Unitika). and; Nylon 4,6 such as Unitika nylon 46 (trade name, manufactured by Unitika); Nylon 6, T like Alen (trade name Mitsui Yuka Sangyo Co., Ltd.), etc. are mentioned.

Regarding the resin (A) as the heat resistant resin used in the present invention, the polyether sulfone resin is an essential resin component. This is because solderability and heat resistance are excellent compared with polyetherimide resin. (Similar polyphenylene sulfide resins cannot be used because they do not exhibit solderability.)

In addition, in this invention, as resin (B), it mixes with resin (A) which has heat resistance, For example, they are polycarbonate resin, polyarylate resin, polyester resin, and polyamide resin, These resin (B) It is contemplated that a portion of) decomposes to produce components (e.g., carboxylic acids, amines, alcohols and aldehydes) that exhibit a fluxing action when mixed with the heat resistant resin (A) or when the insulated wire is soldered.

In the present invention, the amount of the resin (B) mixed in 100 parts by weight of the heat resistant resin (A) is limited to 10 parts by weight or more. This is because if the amount of the resin (B) mixed in the heat resistant resin (A) is too small, heat resistance is increased but solderability is not obtained. On the other hand, when there are too many amounts of resin (B) mixed with resin (A), excellent solderability will be obtained, but heat resistance will decrease. A preferable range in which these two performances are well harmonized is when the resin (B) is 10 to 70 parts by weight with respect to 100 parts by weight of the resin (A).

In the present invention, it should be noted that the polyethersulfone resin and the polyetherimide resin, which are heat resistant resins, exhibit no solderability at all, and the solderability of the polycarbonate resin and the polyacrylate resin is not at a practical level. Only when A) and (B)] are mixed, the solderability is improved to a practical level. Although polyester resins and polyamide resins do not exhibit good solderability, when used alone, they can exhibit practical solderability when mixed in low proportions.

The resin mixture for use in the present invention may be prepared by melting and mixing by using a conventional mixer such as a twin-screw extruder, kneader, co-kneader. It was found that the mixing temperature of the resins mixed directly affects the solderability, and the higher the mixing temperature of the mixer, the better the resulting direct solderability. Preferably the mixing temperature is set to 320 ° C or higher, more preferably 360 ° C or higher.

An inorganic filler, a treatment accelerator, and a coloring agent may be added to the resin mixture as described above, and these are commonly used, and are used in an amount that does not directly affect heat resistance and solderability to form a resin composition for extrusion coating.

In the insulated wire of this invention, although the thickness of the extrusion coating insulation layer formed in particular is not restrict | limited, Generally, thickness is 20 micrometers or more, Preferably it is 30-60 micrometers.

Examples of the conductor used in the present invention include a pure conductor, an insulating conductor having a thin insulating layer or an enamel film coated on the purity conductor, a multi-core stranded wire (wire bundle) composed of a twisted pure conductor, or a thin insulating layer coated respectively. Multicore stranded wire consisting of twisted insulated wire with an enamel film can be used. The number of multi-core stranded wires or twisted conductors can be chosen arbitrarily depending on where applicable. Optionally, when the number of multi-core wires is high, for example 19 wires or 37 wires, the multi-core wires (material wires) may be in the form of strand wires or non-strand wires. In non-stranded wires, multiple conductors, which may be, for example, wires of a conductor or insulated wires forming a raw material wire, are integrally bound in a substantially parallel direction, or their bundles in very large pitches. Can be given. In any case, their cross-sectional area should preferably be circular or approximately circular. However, as the material of the thin insulating layer, a resin having a good soldering phase in itself, such as an esterimide-modified polyurethane resin, a urea-modified polyurethane resin, and a polyesterimide resin, can be used, in particular, for example WD-4305 (trade name, manufactured by Hitachi Kagaku Co., Ltd.), TSF-200 and TPU-7000 (trade name, manufactured by Totoku Kogyo Co., Ltd.), and Fs-304 (trade name Dainichi Seika Co., Ltd.) may be used.

The extruded coated insulated wire of the present invention is excellent in direct solderability at the time of work of the terminal, and has heat resistance satisfying the heat resistance class B or E class defined by IEC standard publication 172.

The present invention will now be described in more detail with reference to the following examples, but the present invention is not limited thereto.

(Examples 1 to 10 and Comparative Examples 1 to 5)

The components shown in Table 1 are mixed in the proportions (parts by weight) described, and each resin composition for the extrusion coating layer is prepared. As a conductor, a varnish layer is coated by making an annealed copper wire (hard wire) of 0.4 mm diameter and a 0.15 mm diameter annealed copper wire with an insulating varnish TSF-200 manufactured by Totoku Paint Co., Ltd. Strand wires each composed of seven insulated and twisted cores having a thickness of 8 μm were prepared, and the outer peripheral surface of the conductor was coated on each resin composition by extrusion coating, so that the coating thickness of each extrusion coating layer was shown in Table 1. As shown, whereby an insulated wire was prepared. Each cross-sectional area of the insulated wire thus prepared is shown in Table 1, and the core of the wire is a multi-core stranded wire. In Fig. 1, reference numeral 1 denotes an insulated wire having an extruded coating layer 3 of a resin composition provided on an outer surface of a strand wire 2 composed of seven insulated wire cores, each of which is a conductor 4 of an annealed copper wire. The insulating layer 5 of the insulating varnish is provided on it.

With respect to the 15 kinds of extruded coated insulated wires thus prepared, the characteristics evaluated were as follows:

Solderability: A portion of about 40 mm at the extrusion-coated insulative terminal was immersed in the molten solder at a temperature of 450 ° C. and the time (seconds) at which the solder was fixed to the immersed 30 mm length portion was measured. The shorter the time required, the better the solderability. Each of the displayed values is the average of three measurements.

Heat resistance: The extruded coated insulated wire and the pure copper wire were twisted according to JIS C 3003, and the twisted wire was heated at 220 ° C. for 7 days. And dielectric breakdown voltage was measured. The larger the value, the larger the heat resistance. When the ratio of dielectric breakdown voltage after deterioration to dielectric breakdown voltage before deterioration, that is, the residual percentage of dielectric breakdown voltage after deterioration is 30% or more, the extruded coated insulated wire satisfies the heat resistance class B of IEC standard. It is admitted. In addition, tests on the heat resistance grade E were derived in the manner described above, except that the temperature was 200 ° C., the period was 7 days, and the residual percentage after degradation was 50% or more.

The above results are shown in Table 1.

[table]

Note: same as above

Examples 1 and 2 are prepared by mixing 100 parts by weight of a mixed resin of polyethersulfone resin and polyetherimide resin with 45 parts by weight of polycarbonate resin as a twisted wire insulating layer. It can be seen that each characteristic is excellent. The higher the PES rate, the better the solderability.

In Examples 3, 4, 5 and 6, 100 parts by weight of polyether sulfone resin was mixed with 45 parts by weight of each resin as each insulating layer. Regardless of the mixed resin, it can be seen that each characteristic is excellent. In particular, mixing with polycarbonate resin was excellent in solderability.

In Examples 7, 8 and 9, the mixing ratio of the polyether sulfone resin and the polycarbonate resin in the insulating layer was varied. It can be seen that as the polycarbonate resin increases, the solderability is improved. In addition, despite the low heat resistance, it can be seen that the satisfactory level.

In Example 10, the conductor is a hard wire. Although the coating thickness was rather thick, the properties were excellent because the range of resin used was within the range in the present invention.

Comparative Example 1 is a conventional format. Although the solderability is excellent, it can be seen that the heat resistance is very low.

In Comparative Examples 2 and 3, since each heat-resistant resin was used alone, the heat resistance was remarkably excellent, but the required solderability was not exhibited at all.

In Comparative Examples 4 and 5, the mixing ratio of the resin was outside the range defined in the present invention, and therefore the required solderability was not started, and even when the solderability was excellent, the heat resistance was very low.

Although the present invention has been described in connection with the present embodiment, the present invention is not limited to these specific examples, and unless otherwise specified, the present invention is broadly recognized within the spirit and scope as set forth in the appended claims. Should be.

None.

Claims (6)

An extrusion coating insulated wire having an extrusion coating insulation layer provided on the outer surface of a conductor directly or through another layer, or on the outer surface of a multi-core wire composed of a collective insulation core or a conductor core. The coating insulation layer comprises 100 parts by weight of the resin (A) comprising polyethersulfone resin as an essential component and polyetherimide resin as an optional component, a polycarbonate resin, a polyarylate resin, a polyester resin, and a polyamide resin. Insulated wire, characterized in that made of a resin mixture to be extruded, comprising 10 to 100 parts by weight of a resin (B) comprising at least one of. The insulated wire according to claim 1, wherein the extrusion coating insulation layer is formed by extrusion coating with the resin mixture comprising 100 parts by weight of resin (A) and 70 parts by weight of resin (B). The resin of claim 1, wherein the extrusion coating insulating layer comprises 100 parts by weight of a polyether ether sulfone resin and at least one selected from polycarbonate resin, polyarylate resin, polyester resin, and polyamide resin. Insulated wire formed by extrusion coating the resin mixture comprising a weight part. The insulated wire of claim 1, wherein the extrusion coating insulation layer is formed by extrusion coating the resin mixture comprising 100 parts by weight of polyether sulfone resin and 10 to 70 parts by weight of polycarbonate resin. The insulated wire according to claim 1, wherein the multi-core wire provided with the extrusion coating insulation layer is a multi-core strand wire composed of a conductor core or an insulated core twisted together. The insulated wire according to claim 1, wherein the multi-core wire provided with the extrusion coating insulation layer is a multi-core non-strand wire composed of a conductor core or a bundle of insulation cores.