JPS598742A - Composition for conductive material having watertightness - Google Patents

Abstract

PURPOSE:The titled composition having improved adhesiveness to a conductive material without causing greasiness, obtained by blending an ethylene-vinyl acetate copolymer and an ethylene-ethylacrylate coplymer with an ionomer resin. CONSTITUTION:100pts.wt. ethylene-vinyl acetate copoplymer and/or ethylene- ethyl acrylate coplymer is blended with 5-50 ionomer. The blend may be blended with a small amount of an antioxidant and a softening agent. To pack this composition into a raw wire of conductive material, it is extruded into a tape or ribbon, twisted with the raw wire, and subjected to compression creep by a deep draw dice, etc. so that it is packed into the twisted wire of conductive material. The composition has proper bond strength in the adhesiveness to the conductive material, is not released even if stress such as bending stress is applied to it, and it can provide sufficient watertightness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement of a one-year-old combination used for a wire-free electric wire or a wire conductor.

Conventionally, to obtain water quality, in the wire twisting process, a sherry-like water-tight mixture is added to the conductor strands at i = 1 strand)
If this water-tight mixture gets attached to a twisting machine or other bribery equipment, it will become sticky and will be contaminated with dust. This will easily cause further dirt, and it will save you a lot of effort to clean it. This made the workability of connecting the terminals of dicarmic acid extremely difficult.

Therefore, non-stick water-damaging mixtures such as ethylene-vinyl acetate copolymers have recently appeared, and these mixtures are used to fill gaps between conductor wires during the conductor stranding process or to extrude insulators. During the process, the gap between the conductor strands is filled with an extruder or the like at the same time as the insulator is extruded.

However, this non-sticky mixture is similar to copper and aluminum as conductors. C. Due to poor adhesion, if a cable or electric wire made by filling the conductor gap with the above mixture is repeatedly subjected to bending stress such as winding it around a drum,
This may cause a separation dust phenomenon between the conductor and the admixture, reducing the watertight properties and significantly impeding the performance as a watertight cable.
Met.

The present invention aims to solve the current situation and has discovered a watertight mixture that has good adhesive properties with 414- without causing stickiness. υ19 invention is ethylene -ffl-
ff Vinyl copolymer/or ethylene-ethyl acrylate copolymer 100m Ionomer resin 5 to 5 on the hair part
It is similar to the mixture of 0 Kouhyobu.

In the present invention, ionomer fat is ethylene-
Methacrylic acid co-organized complex α] has a structure in which the molecules are cross-linked with gold-faced ions such as sodium and zinc.
It is manufactured by Mitsui Polychemical Co., Ltd. and has excellent adhesive properties.

In addition, the reason why the amount of ionomer M (l1if) in the composition of the present invention is limited to 5 to 50 parts is that when the amount is less than 5 parts by weight, the resulting composition has poor adhesion to conductors. It is not possible to know the full effect in
Also, if more than 50 parts are mixed, the composition will adhere excessively to the conductor, making it extremely difficult to remove the admixture during unconnected work. It's for a reason.

Note that a small amount of anti-aging agent and softening All may be added to the composition of the present invention.

In order to fill the conductor cable with the composition of the present invention, the cedar composition 1 is rolled out in the form of a tape or a string, twisted together with the conductor cable, and then pressed with a drawing die or the like. -7" and then twist and fill the conductor with soil b [shi's press (B
This is to fill in the exclusive interrogation group in I 4-a.

Next, the implementation of the present invention will be explained.

Examples (1) to (5) and Comparative Examples (1) to (3) The compositions shown in Table 1 were strung by an extruder in the wire twisting process of conductors; , 4 were combined to obtain a 60m12 copper stranded conductor.

This conductor is coated with a crosslinkable polyethylene composite by extrusion,
Crosslinking was performed in the crosslinking zone to obtain a crosslinked polyethylene insulated wire.

Notes (1) Ethylene-vinyl acetate co-polymerization M1 = 55 (2) Ethylene by beer co-polymerization MI = 150 (3) Ethylene-ethyl acrylate co-polymerization M l = manufactured by Nippon Unicar ■, manufactured by Mitsui Polychemicals ■ 20 (4) Ionomer resin Na ion type manufactured by Mitsui Polychemicals (4'=I=l ~ 11; +I 0 (5) Mitsui Polychemicals ■ manufactured ionomer resin Zn ion type M1-5 Insulated wire thus obtained After bending 20 times the outer diameter of the insulator 5 times for each case, 1.
．． The B nails were watertight for 24 hours at a water pressure of 0 kg/cnt.

As a result, the insulated wire made of the composition of the present invention did not leak water even after 24 hours. Also, when I tried to peel off the Zettai sphere in order to connect the terminal, it peeled off without any particular difficulty. On the other hand, those of Comparative Example (1) and Comparative Example (2) of Comparative Example Composition R (based on insulation electrical insulation) leaked water within 24 hours. However, when attempting to peel off the insulator in order to connect the terminals, the conductor and insulator were tightly adhered to each other, making it extremely difficult to do so.

As detailed above, the composition of the present invention has extremely high adhesion properties with conductors, such as being able to maintain adequate watertightness without peeling off even when subjected to bending or other force, while maintaining adequate adhesion strength. It is something.

Claims (1)

[Claims] Ethylene-auto string vinyl, ML base and/or ethylene-ethyl acrylate co-combination 100M Denon VS9
A composition for a watertight conductor that has been applied with 5 to 50 plates of +-ionomer.