JPS58147902A - Insulated electric wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an insulated wire for winding, which is formed by extruding a resin onto a conductor and providing a thin film coating layer thereon.

Conventionally, insulated wires for winding are mainly made by coating the conductor with synthetic resin paint and baking it to provide a Ne3 coating layer, but recently from the viewpoint of resource saving, energy saving, non-pollution, and high productivity, An insulating tube 1 in which a synthetic resin is extruded from an extruder and the conductor is completely coated with a thin film? For example, N is JP-A No. 5
This is proposed in Japanese Patent No. 3-4875.

This method has been made possible by the total extrusion method of forming a thin synthetic resin coating required for insulated wire for winding, which has been difficult in the past, and has great engineering value.

When an extruder is used to produce insulation for winding, the synthetic resin used is essentially C', heat, lη, and resin, but what about the winding properties? An example of a synthetic resin that has both properties is a kimono made of polyethersulfone resin, which is extremely rotten.
Since it is curved, it is difficult to use it for general use, and on the other hand, inexpensive resins that can be used for general use have problems in terms of properties. Month 1
Polyester thread resins obtained from aromatic dicarboxylic acids and aliphatic glycols, such as gelatin ethylene terephthalate (hereinafter referred to as PET) or polybutylene terephthalate resin (hereinafter referred to as PBT), are electrically insulating. It has not yet been put to practical use as a material, and loquat for winding has the potential to have excellent heat resistance even as a coating material, and it is inexpensive because it is used as a large violet in film and Ni-I-ji. The points are also an advantage.

However, the present inventors have found that when insulated wires coated with these polyester resins by extrusion coating are used as winding wires, there are serious defects. The original heat resistance and mechanical properties are fully exhibited only after crystallization under the orientation layer 44, or when the resin is simply extruded and coated using an extruder to provide insulation for winding wires, the resin's Due to the viscoelasticity of the melt, orientation due to drag during extrusion cannot be expected, and it is impossible to stretch only the coating layer without stretching the conductor. Since the ester resin thin film is non-oriented and has low crystallinity, it cannot have excellent heat resistance and mechanical properties.

In fact, for this insulated wire, the dielectric breakdown voltage value for a two-piece twisted test piece specified in JISC-3003 is fully specified.
Immediately after production, it exhibits a significantly high level of clay, but if left in an environment of 30°C or higher, it quickly decreases. This decrease in fracture stress is caused by the I7-song that occurs during test piece fabrication. ('rM, such crazing does not occur immediately after the wire is manufactured.) This phenomenon is caused by a change in the optical bond density of the molecule due to the volume relaxation of the sacrificial layer. It's rice.

In order to prevent the occurrence of crazing, it was proposed in JP-A-56-73 that 5 to 15% titanium dioxide be added to PET.
This was proposed in Publication No. 817.

However, even if such a method is used, the above-mentioned
! When the 11-twist test specimen was subjected to extremely severe curling, the improvement effect was not confirmed and the clay song phenomenon still occurred.

The present invention is made of polyester yarn resin Qlj/ which can maintain all the heat resistance, suppress the clay song phenomenon, and prevent the deterioration of dielectric breakdown voltage due to changes over time. All the babies were released. In the present invention, ff1J also has an ethylene-based compound that completely cures carboxylic acid or carboxylic acid salt in the lI411 chain on the conductor. A thin film P3 edge layer made of a 'frc southern fat mixture is formed by extrusion, containing 1 to 15 of the soil-combined stool sebum in the sub-wound area.

The reason why the above-mentioned effects are expected in the present invention is that the ethylene resin having a carboxylic acid group has good compatibility, so that the elongation at break can be reduced to a certain extent without reducing the heat resistance of the polyester resin. It is thought that this can be suppressed within the limits.

In the present invention, the polyester resin f: The constituting aromatic carboxylic acid components include, for example, terephthalic acid, isophthalic acid, naphthalene carboxylic acid, diphenylnocarboxylic acid, nophenylsulfonthocarboxylic acid, and nonphenyl ether carboxylic acid. Alternatively, it may be an alkyl ester of these acids, a D silicide, or the like. Examples of the aliphatic glycol include ethylene glycol, zoropylene glycol, butylene glycol, and hexane glycol. Among these, PICT, which is a combination of terephthalic acid and ethylene glycol, and PBT, which is a combination of terephthalic acid and butylene glycol, are representative.

Examples of ethylene-based co-hypoallymers having a carboxylic acid in the side chain include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, or maleic acid, hexamaric acid,
It refers to a copolymer of an unsaturated nocarboxylic acid and an ethylene polymer, such as phthalic acid, and also includes one in which a part of the carboxylic acid of the OII chain is converted into a gold maple salt. A typical example of such resin is Himilan (trade name of Mikata Polychemical Co., Ltd.), which is a so-called ionomer resin made entirely of metal salts of carcinic acid of an ethylene-methacrylic acid copolymer.
There is also EAA@fat (trade name, manufactured by Dow Chemical Company, USA), which is an ethylene-acrylic acid copolymer.

In the present invention, regarding the mixing ratio of polyester resin and ethylene copolymer resin, the former is I OON-, f
For the at part, the latter is 1-15 heavy, preferably 1 or 5-10.
Parts by weight. Reason for limiting in this way: 'l
This is because if the amount is less than 15 parts by weight, the full effect of the present invention cannot be exhibited, and if it exceeds 15 parts by weight, the heat resistance of VC decreases and it cannot be used as a gland.

Further, inorganic fillers such as talc, titanium dioxide, aluminum hydroxide, silica powder, etc. may be added to the resin mixture used in the present invention.

Furthermore, in the present invention, the outer side of the thin film layer formed of the resin mixture may be coated with a polyamide-based resin in order to completely strengthen the mechanical properties. In this case, the polyamide resin may be 6.6 nylon, 6 nylon, 6-10 nylon, polytrimethylhexamethylene prephthalamide, or the like.

In the present invention, after extrusion coating a resin mixture on a conductor,
It is also possible to increase the degree of crystallinity and improve the mechanical properties by appropriately adjusting the cooling conditions. In this case, if the temperature of the coated wire is at least the glass transition point, crystallization will occur in principle, but in order to achieve the full wire speed at high locations, it is desirable to maintain the coated wire at a temperature of 100° C. or higher.

Next, examples of the present invention will be described. In addition, all the resin mixtures in the examples are 30mmφ for kneading 2 II! The mixture was kneaded using a III extruder. (The following parts indicate severe injuries.) Example (1) PE was placed on a 1 mmφ copper wire that had been preheated to 280°C.
ionomer resin (Himilan 18 manufactured by Mitsui Polychemical Co., Ltd.) per 100 parts of
55) I O conveniently blended resin mixture sound 301 + anφ
#L using an extruder (extrusion conditions 230-280°C)
The insulated wire of the present invention has been reversed.

Example (2) An insulated wire of the present invention was obtained in the same manner as in Example (1) except that a resin mixture containing 15 parts of ionomer and 100 parts of PET was used.

Example (3) PBr was placed on a copper wire of 11 mm diameter that had been preheated to 250°C.
An insulated wire of the present invention was obtained by coating a resin mixture of lOO with 1 part of an ionomer resin using an extruder of 30 mm diameter (extrusion conditions: 210 to 250 DEG C.).

Example (4) An insulated wire of the present invention was obtained under the same conditions as in Example (11) except that a resin mixture containing 8 parts of EAA m fat to 100 parts of PET was used.

Comparative example (1) PET was placed on a 1 m 1 iφ copper wire preheated to 280°C.
Extruder of 30111111φ (extrusion conditions 240~2
80° C.] to obtain a comparative insulated wire.

Comparative example (2) PBT on Imiφ copper wire preheated to 250°C
(Mikata Petrochemical HFEt-PMTG-20OA)'r3
Q mmφ extruder (extrusion conditions 210-250℃)
A comparative insulated wire was obtained by extrusion coating.

Comparative Example (3) A comparative insulated wire was obtained under the same conditions as in Comparative Example (1) except that a mixture of 100 parts of PET and 8 parts of titanium dioxide (Ryuu Sangyo Thai Bake A-100) was used.

9- Comparative Example (4) Comparative example insulated wire was made under the same conditions as Example (1) except that a resin mixture containing 8 parts of polyethylene resin (Mitsui Petrochemical Hi-Zetsuku 5305EF) was used in 00 parts of PET. I got it.

The results of measuring the characteristics of the thus obtained insulated wire of the present invention and the insulated wire of the comparative example are shown in Table 1.

-10~ As detailed above, the insulated wire of the present invention has excellent heat resistance and electrical properties without causing clay songs, dielectric breakdown, or direct pressure drop over time.
N, and its practical value is extremely large.

Applicant's agent Patent attorney Takehiko Suzue, Commissioner of the Patent Office
Kazuo Wakasugi 1, Indication of the case % Application No. 57-29159 2, Name of the invention Insulation Dragon Line 3, Relationship with the Nagisa 7JT case to be amended Patent applicant (529) Koji Kamekikogyo Co., Ltd. 11, Agent 6 Contents of amendment 7 to the specification (1) On page 5, line 6 of the specification, it says ``cutting and elongation without deterioration.'' Correct.

Claims (1)

[Claims] On the conductor, 1 to 15 parts by weight of an ethylene copolymer resin having a carboxylic acid or carboxylic acid salt in the side chain is added to 100 parts by weight of a linear polyester resin consisting of an aromatic dicarboxylic acid residue and an aliphatic glycol. An insulated electric wire characterized by extrusion forming a thin film insulating layer made of a resin mixture.