JPH01161607A - Self-melting insulated wire - Google Patents

Abstract

PURPOSE:To improve the heat resistance, self-melting property, process resistance and self-lubricity by providing a specific covering layer on a conductor directly or via another insulator. CONSTITUTION:A covering layer made by arranging ethylene-vinyl acetate-vinyl alcohol copolymer 0.01-20 pts.wt. to a mixture 100 pts.wt. of phenoxy resin, epoxy resin, 2.2'-(1.3-phenylene) bis(2-oxazoline) or its derivative, phenol resin and/or melamine resin is provided on a conductor directly or via another insulator. The phenoxy resin used is a compound containing a hydroxyl group in a molecule, the epoxy resin is a compound containing two or more epoxy groups, thereby good abrasion resistance and self-lubricity can be obtained without reducing the melting force and heat resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a self-bonding insulated wire with excellent self-lubricating properties.

(Technical background of the invention and its problems) Conventionally, from the viewpoint of labor saving and simplification in the coil forming process of electrical equipment and communication equipment, and safety and health and environmental pollution prevention in the varnish impregnation process of equipment, etc., A so-called self-bonding insulated Ti wire, which is formed by providing a heat-fusible coating film with an insulating layer interposed therebetween, is used.

Polyvinyl butyral resin, polyamide resin, phenoxy resin, etc. are often used as the heat sealing layer of this self-bonding insulated wire.
Since it softens by 50° C., there is a problem in that the fusion strength is significantly reduced when an overload current flows through the coil or when it is placed in a high temperature atmosphere.

In addition, alcohol-soluble Nipun resin at high temperatures
Although it has high adhesive strength, the thermal deterioration property of the adhesive layer, which is the lifespan of the insulated wire in actual use, is as low as about 105°C.

Furthermore, although polysulfone resin has no problems with adhesive strength at high temperatures, it requires long hours of work at Mm of 250°C or higher in order to maintain sufficient adhesive strength during fill diagnosis, and has the disadvantage of poor workability. ing.

The present applicant used l-realylate resin as a result of repeated research on compositions with excellent heat resistance and self-bonding properties. (Japanese Unexamined Patent Publication No. 59-60906), and 2.2' (1
・3-phenylene)bis(2-oxazoline) (hereinafter P
(abbreviated as BO) (JP-A-60-23394)
No. 7) has been found to produce excellent effects. However, these compositions do not have sufficient self-lubricating properties;
There were problems with the workability and wear resistance of the resulting insulated wire.

In order to speed up the winding work of enameled wire, etc., the use of high-speed automatic winding machines has become common in recent years.

In such mechanical winding, if the enameled wire does not have good self-lubricating properties, unnecessary tension will be applied and the electrical properties of the resulting product will deteriorate significantly. For the purpose of imparting mechanical properties, a method has been adopted in which a nylon resin is used as the outer layer of the double coating layer, but this method has the disadvantage that heat resistance is significantly reduced. There is also a method of adding a composition containing silicone oil to the coating layer of the insulated wire, but the amount of silicone oil added is limited because the appearance of the resulting coated layer becomes poor, so it is difficult to process. Sexuality was insufficient.

(Objective of the Invention) Focusing on the above points, we created a self-bonding insulation that has good heat resistance and self-bonding properties, as well as excellent workability and self-lubricating properties! Intended to provide a line.

(Summary of the Invention) The present invention comprises (a) a phenoxy resin, (b) an epoxy resin, e92,2'-(l,3-phenylene)bis(2-oxazoline) or a derivative thereof, and (a) phenol. (v) ethylene-vinyl acetate-vinyl alcohol copolymer is added to the mixture of resin and/or melamine resin based on 100 parts by weight of the mixture of (b) to (b). The present invention relates to a self-bonding insulated wire in which a coating layer containing 1 to 20 parts by weight of O is provided directly on a conductor or by removing another insulator.

As the phenoxy resin (a) used in the present invention,
It is a compound containing a hydroxyl group in the molecule, and the molecule j12G
, ooo ~ 30,000, e.g., P K HHlPK
There are HJ (trade name, manufactured by Union Carbide Company, USA), etc.

The engineered mexyl resin used in the present invention is a compound containing two or more epoxy groups in the molecule, such as bisphenol-type epoxy resin, polyol-type epoxy resin, novolak-type epoxy resin, polyhydric carbonate resin, etc. ra
Any of type 2l xy resin, riazine type epoxy resin, polyolefin type epoxy resin, and fat type epoxy resin can be used.

The PBO (c) used in the present invention has a structure of
It has the property of causing a ticket-opening reaction between an acid or a compound containing active hydrogen and the oxozoline ring to form a three-dimensional crosslinked structure with esteramide bonds without producing any by-products.

Further, the derivative of PBO is a polyhydric derivative obtained by reacting PBO and a polyhydric carboxylic acid with o PBO obtained by reacting PBO and a polyhydric carboxylic acid without a solvent or in a solvent using triphenylene phosphite as a catalyst at a temperature of at least 100 ° C. Carboxylic acids contribute to the ring-opening reaction with PBO and the curing reaction with epoxy resins, and those used in the present invention include dibasic acids such as terephthalic acid and maleic anhydride, dibasic acid anhydrides, Tribasic acids such as trimellitic acid and their anhydrides, tetrabasic acids such as pyromellitic acid and their anhydrides, etc. 7-enol resins or melamine (for the purpose of increasing the thermal softening temperature of the composition) Add the resins alone or in a mixture. fF used in the present invention x/-k fF
, g As the fat, phenol-formaldehyde resin, cresol-formaldehyde resin, cresol-formaldehyde resin,
Furfural resin etc., melamine resin, melamine-formaldehyde resin, butylated melamine! There is fat etc.

In the present invention, the desirable blending ratio of (a), (b), e), and (b) is as follows: 1 to 40 parts by weight of the epoxy resin (b) to 100 parts by weight of the phenoxy resin (-r);
c) 3 to 60 parts by weight of PBO; and 10 to 60 parts by weight of phenolic resin and/or melamine resin. If the blending ratio is outside this range, the heat softening temperature will be lowered and the fusion strength will be lowered.

In the present invention, the ethylene-vinyl acetate-vinyl alcohol copolymer (e) is blended for the purpose of increasing the self-lubricating effect of the self-bonding insulated wire. (E)
Although any known copolymer can be used, the effect of improving self-lubricating properties becomes even more favorable when a copolymer containing 0.5 to 15 moles of vinyl alcohol groups is blended.

In addition, the ethylene-vinyl acetate-vinyl alcohol copolymer (@) is a mixture 1 of the above (a), (su, (c), ni).
0.01 to 20 parts by weight per 00 parts by weight.

If the amount is less than 0.01 parts by weight, the resulting electric wire will have poor self-lubricating properties, and if it exceeds 20 parts by weight, the heat resistance will decrease.

Incidentally, in the present invention, examples of the solvent used when kneading each component (e) to (e) include cresol, naphtha, cyclohexanone, etc., and these may be used alone or in a mixture.

The self-bonding insulated wire of the present invention is manufactured by kneading each component with a solvent, applying a coating material onto a conductor directly or via another insulator, and baking the coating in a conventional manner.

(Example of the invention) Examples of the present invention will be described.

The compositions shown in Table 1 were mixed and thoroughly stirred to obtain a paint.

The obtained paint was applied onto an enameled wire consisting of a copper wire with a diameter of 1.0 m and a polyesterimide coating of 0.04 IllIK, and baked at an oven temperature of 400° C. and a line speed of 14 @/min. The following tests were conducted using the obtained self-bonding insulated wire.

The fusion strength is as follows: A coil made by winding the obtained self-bonding insulated wire 50 times around a mandrel with a diameter of 6.4 mm is heated at 240℃
After heating for 30 minutes to cure the fusion bond, the fusion strength was measured at room temperature and 8
Measured at 0°C. Abrasion resistance is determined by JI with a load of 700g.
Measured according to SO30031976-10.1. Self-lubricity was determined by measuring the static friction coefficient using a static friction tester.

As a comparative example, self-bonding insulation [&[ was manufactured and tested in the same manner as in the examples, using the formulations shown in Table 1.

In Comparative Examples 1 and 2, no ethylene-vinyl acetate-vinyl alcohol copolymer was added, and both self-lubricity and wear resistance were low. Comparative Examples 3 and 4 show cases in which an excessive amount of ethylene-vinyl acetate-vinyl alcohol copolymer was added, and a decrease in heat resistance and fusing strength was observed.

Examples 1 to 7 have a margin of 0 or less that has good abrasion resistance and self-lubricating properties without reducing fusing strength and heat resistance (effects of the invention). It has properties that greatly improve self-lubricating properties without reducing adhesiveness or heat resistance, and can withstand mechanical winding operations.

Claims (1)

[Claims] (a) phenoxy resin, (b) epoxy resin, (c) 2,2'-(1,3-phenylene)bis(2-oxazoline) or its derivative, (d) phenolic resin and/or melamine. Add 0.0 parts by weight of (e) ethylene-vinyl acetate-vinyl alcohol copolymer to the mixture with the resin per 100 parts by weight of the mixture of (a) to (d) above.
A self-bonding insulated wire comprising a coating layer containing 1 to 20 parts by weight of 0.01 to 20 parts by weight, provided on a conductor directly or via another insulator.