JPS6022505Y2 - Winding wire for underwater motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding for an underwater motor, particularly a winding for an underwater motor used in high-temperature water.

Conventionally, windings for underwater motors insulated with polyethylene, cross-linked polyethylene, polypropylene added with EP rubber, etc. have been used, but the insulator layer of these windings is used in contact with high-temperature water. During this period, mechanical strength, electrical insulation properties, voltage resistance properties, etc. deteriorate significantly, and there is a problem that dielectric breakdown occurs after a relatively short period of operation.

In view of the above, the present invention proposes a novel winding for underwater motors that maintains high insulation performance over a long period even in high-temperature water, and has an insulating layer made of poly-4-methylpentene-1 on the conductor. It is characterized by its structure.

FIG. 1 is a sectional view of an embodiment of the present invention, in which 1 is a copper conductor, 2 is a conductor shielding layer, and 3 is an insulating layer made of poly-4-methylpentene-1.

As poly-4-methylpentene-1, homopolymers and copolymers of 4-methylpentene-1 are used.

Examples of such polymers include ASTM D 1238-
It is a crystalline polymer having a melt index of 1 to 10, especially 5 to 80, measured at 70 (260 °C t 5 kg), and a stereoregularity with a density of 0.82 to 0.8 at 23 °C.

Poly 4-methylpentene-1 is 4-methylpentene-1
1 is produced by a method such as polymerization with a copolymer component described later using a Ziegler type reactor.

Co-monocarbon acid components include ethylene, propylene, butene, pentene, hexene, octene, 3-methyl-butene-1,3-methyl-pentene-1,4゜4'-dimethyl-pentene-1,3-methyl - Straight chain or branched fatty acid hydrocarbon vinyl compounds such as hexene-1, styrene,
Orthodivinylbenzene, methadinylbenzene,
Examples include aromatic hydrocarbon vinyl compounds such as paradivinylbenzene, metadivinyltoluene, paradivinyltoluene, and α-methylstyrene.

The copolymer component may be of type 18, or two or more types may be used.

1. The poly-4-methylpentene-1 used in the present invention preferably contains at least 6% of 4-methylpentene-1.

0.1-2% of aromatic hydrocarbon vinyl compounds
One of the preferable ones is one containing the above.

Furthermore, poly-4-methylpentene-1 used in the present invention
may be plasticized with a suitable plasticizer.

As a plasticizer, for example, the following general formula (where R□~
R1 is hydrogen or an alkyl group having 18 or less carbon atoms,
It has an average molecular weight of about 200 to about 5000.

), such as those obtained by oligomerizing one or more olefin monomers having 2 to about 20 carbon atoms using a Ziegler catalyst, a Friedel-Krach catalyst, etc., polybutene etc. are used.

The appropriate amount of α-olefin oligomer to be used is about 3 to 20 parts by weight per 1,100 parts by weight of poly-4-methylpentene.

The appropriate thickness of the insulator layer 3 is about 0.2 to 2 rran.
It can be formed by conventional extrusion coating.

Although the conductor shielding layer 2 is not absolutely necessary, it is preferable in the present invention to provide it because poly-4-methylpentene-1 tends to be degraded by copper.

Layers of various plastics, baked enamel layers of heat-resistant resins such as polyamide, polyimide, polyamideimide, A
A plating layer of Ni, Sn, etc. is effective in preventing deterioration caused by copper, and is therefore suitable as a constituent material of the conductor shielding layer.

Its thickness is 0.01 TIvn ~ 0.1 in case of enamel layer
Approximately 1 rrIn is appropriate.

In the case of a plating layer, the appropriate thickness is about 0.001 mm to 0.01 mm.

FIG. 2 compares the insulation life of a polyethylene insulated winding A as a comparative example and a winding B of an embodiment of the present invention.

Both windings have a 0.045 mm thick polyamide-imide baking layer on the copper conductor wire with an outer diameter of 2.0 m, and a 0.38 mr layer on top of that.
It has a structure having an insulating layer of r+thickness, and the winding B of the example
As the insulator constituent material, melt index (260℃95ko) made by Mitsui Petrochemical ■: 2 density (23
°C): 0.840. Infrared characteristic absorption band: 720c
m-', 790.849.870. ．． 917°993
, 1127.1195.1230.1269. 136
3.1437°1740 poly 4-methylpentene-1
was used.

To measure the insulation life, the winding under test is immersed in water set at each temperature, and the conductors are placed between the water and the conductors that are in contact with each other on the water surface.6.
An AC voltage of 6 kV and 60 Hz was continuously applied, and the time required for dielectric breakdown to occur was defined as the insulation life.

Also, in place of the poly-4-methylpentene-1 used in winding B, the same poly4-methylpentene-1 was substituted with 6
Parts by weight of α-olefin olegomer (Lion Yushi Co., Ltd.
Winding C with the same configuration as Winding B was manufactured and its insulation life was measured, except that it was plasticized by blending the product name Lipoloop 70), and it showed the same insulation life as Winding B. .

As is clear from FIG. 2, the insulation life of the winding of the present invention in high-temperature water is much longer than that of the conventional polyethylene insulated winding.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, in which 1 is a conductor and 3 is an insulating layer made of poly-4-methylpentene-1. FIG. 2 compares the insulation life of a conventional underwater winding wire and the winding wire of the present invention in an underwater electrification test.

Claims (1)

[Scope of utility model registration request] A winding wire for an underwater motor characterized by having an insulating layer made of poly-4-methylpentene-1 on a conductor.