JPS59127305A - Semiconductive mixture - 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 [Unexploded I31] relates to an oil-containing mixture used as a material for the outer half of a cross-linked polyolefin insulated cable.

Conventionally, the extruded external semiconducting material for crosslinked polyolefin insulating cables has mainly been made of ethylene-vinyl conjugate (gvA) as a base polymer, mixed with conductive carbon black. has been changed once.

First, when using the cable, it is essential that the external semiconducting layer be in close contact with the insulator formed on the inner layer of the cable, and on the other hand, it must be able to be easily peeled off from the outer layer when processing the terminals. will be in the room. However, the conventional semiconducting layer made of EVA as a pace polymer has the disadvantage that its shielding force with the insulator is too strong and peeling is difficult.

In view of the above-mentioned circumstances, the present invention is capable of forming an external semiconducting layer which is closely layered with a cross-linked polyolefin insulator made of cross-linked polyethylene resin, ethylene-propylene rubber, etc., and which is easily peeled off from the insulator described in iiJ. It was made for the purpose of providing a semiconductive mixture.

In order to achieve this purpose, the Ministry of Unexploded 8A, etc. is 8! As a result of υF death, it was found that by using a polyamide resin or a mixture of a polyamide resin and a polyolefin Tsukuriki a as a base polymer, a mixture with good releasability to a polyolefin can be obtained, This led to the present invention.

The present invention will be explained in detail below.

The uninvented conductive mixture uses a polyamide resin or a combination of a polyamide resin and a polyolefin resin as a base polymer, and this base polymer
Conductive carbon black 10 to 100 per part of oi
Special feature is that the imaginary part is mixed.

As the polyamide resin used in the present invention, dimer acid ((1)
The typical structural formula is shown in the formula. ) or a condensation product of this dimer acid mixed with adipic acid, azelain, cepatine, etc., and diamines such as hexibumethylene diamine, and with a homogeneous molecular bone. 1
,000 to 100,000, preferably 3. oOo~
5 Q,000 is preferred, but other polyamide resins can also be used.

Example of the above polyamide resin 9 commercially available product - C1Milv
Ex, Persalon, Persamide, Macromelt (all manufactured by Henkel Japan), etc. are available.

In addition, as polyolefin resin, polyethylene (P
E), ethylene-propylene rubber (FiPM).

EPDM), EVA, ethylene-ethyl acrylate copolymer (EEA), etc.

The base polymer of the ahydrate of the present invention is formed by the half-product of the polyamide resin described above or a mixture of the polyamide resin and polyolefin 141Jv.

When using a mixture as the base polymer, the mixing ratio of polyamide resin/polyolefin resin is 10
/90 or more is desirable.

When the mixing ratio is 10,790, it becomes difficult to separate the obtained semiconductive mixture from the insulator.

As the conductive carbon black that is cooled to impart electrical properties to the base polymer, well-known carbon blanks such as acetylene black and furnace plaque can be used. The amount of carbon black to be mixed with the base polymer is determined in consideration of the conductivity required of the semiconductive layer, and is usually 10 to 100 parts by weight per 100 parts by weight of the base polymer.

Moreover, crosslinking firmness, crosslinking aids, anti-aging agents, etc. can be added to the semiconductive mixture I formed by mixing the base polymer and carbon black, if necessary.

'A 4ig Ml' includes dicumyl oxide (DOF), 2,5-dipyl-2,5-di(t-
) (Tylperoxy)Hexine-3, etc. can be used in MIJ or Yoshii, and as a linkage aid, triallyl cyanurate, triallyl isocyanurate, m- Phenylene bismaleimide and the like can be used.These crosslinking agents and crosslinking aids can be used in combination, or either one can be used independently.Also, as an anti-aging agent, 4,41- Naobis (6-t-butyl-3-methylphenol) and the like can be used.

Therefore, the Chihiro electropolymer mixture of the present invention containing each of the above-mentioned components can be used as a material for an external semiconductive layer formed on the surface of a loquat layer of a crosslinked polyolefin insulated cable. It is suitable. In order to form an external semiconducting layer using the above-mentioned mixture, it is possible to apply the usual pressing method to the T-caple on which the insulating layer has been formed, in the same manner as the conventional method. Around.

As a result, the resulting turtle caple maintains good layering properties between the insulator layer and the outer semiconducting layer during normal use, and during terminal treatment, the outer semiconducting layer can be separated from the insulating layer. Can be easily peeled off. Therefore, the electrical characteristics during use are maintained well, and the ease of processing during terminal processing is improved.

Next, examples will be shown to explain the present invention in detail.
Prepared with a 5+m# formulation of nl~5. In addition, a mixed first product for Hinu was made V@ with the composition of the two rods of NcL6.7 shown in the asci.

An annealed copper twisted wire with an area of 50-h is coated by extrusion with PE having a width of D OP 2 wtφ to form an insulator layer, and then each of the above mixtures is extruded and coated to form an external and internal conductive layer. ,7
I made a maple cable. In addition, the weight of the frame processing is 6kg/
The experiment was carried out in saturated steam.

For the above 7 other types of cables, the force contributing to the peeling of the external semiconducting conductor is A11ure C! 55-79H
I took measurements based on the theory of ll. The results are shown in the table.

Note) The blending ratio is 4,4'-thiobis(6-t-butyl-3-methylphenol) as shown in the table. Cables formed with 0.5 to 1.5 kl of their outer semiconductor layer / o, 5
It was confirmed that peeling could be performed with a force of about an inch, and that peeling was easy within comparison example NQ6.7, which corresponds to the conventional one.

As is clear from the above description, when the semiconducting mixture according to the present invention is used as a material for the outer semiconducting layer of a crosslinked polyolefin insulated cable, the outer semiconducting layer can be easily peeled off from the insulator. This has the effect that it is possible to obtain a group that is distinguished by the workability of terminal processing.

Taganjinden f'WL Line Co., Ltd.

Claims (1)

[Claims] The base polymer is a mixture of polyamide (sjb) or polyamide (sjb) and polyolefin cutting.
A semiconductive mixture comprising 10 to 100 parts of conductive carbon black mixed with 100 parts of this base polymer.