JPS6164013A - Method of producing electric cable - 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 (Industrial Field of Application) The present invention relates to electric cables, especially polyethylene extruded wave atk
This invention relates to a method for manufacturing a core capule used as an insulating layer.

(Prior art) Polyethylene has excellent insulating properties and is often used for cables with extrusion coatings because it can be mass-produced.
, even more heat resistant? In order to increase the strength, cross-linking of polyethylene using a cross-linking agent has been carried out.

However, the commonly used polyethylene is low-density polyethylene, which has a small amount of ``organic peroxide added to it''. High-density polyethylene is used to manufacture electrical cables by heating, decomposing, and cross-linking, and high-density polyethylene is low in temperature. Takumi Polyethylene Lt) Even though it has better electrical properties, it is used to crosslink and create the next insulating layer. Cables with this have not yet been manufactured.

(Issues to be improved) Although it is possible to flexibly construct a power cable using low-density cross-linked polyethylene as the R layer, high-density cross-linked polyethylene is considered to be preferable because the innolus pressure resistance is low, but it is difficult to manufacture cables using high-density cross-linked polyethylene. What you can do with polyethylene you can't do with high density polyethylene, but high density polyethylene has a high melting point.

Crosslinking agent [This is because it cannot be kneaded in. However, there is a known method of impregnating low-density polyethylene (LDPE) (1) 4-pack pellets with a crosslinking agent (organic peroxide) by stirring at high speed in a mixer.
However, even if you try to impregnate the cross-linking agent in the mixer, the heat generated in the mixer will cause the cross-linking agent to break down due to the heat generated in the mixer. Stack Q
The problem is that there is no 4t or Ace in the 7th wood.

(Means for Solving Problems) The present invention has been made in view of the above-mentioned circumstances, and it does not require the use of powdered high-density polyethylene, but it is impregnated with an F-crosslinking agent to make it easy to use, and is supplied in an extrusion manner. A high-density polyethylene insulated power cable can be obtained by easily attaching an extruded plate to the outside of the conductor and cross-linking the conductor at a temperature of N2 to 4J4.

(11 cases of dogs) An example of an electric cable that can be obtained from this production? Drawing ((To explain in detail, on the conductor 1, there is an inner semiconducting layer 2, a high-density polyethylene insulating layer 3, an outer semiconductor layer 4, a metal shielding layer 5, and a plastic sheath 6). It is.

The following is an example of a failure in the manufacturing method of a stiff cable.

Powdered high-density polyethylene (manufactured by Mitsui Petrochemicals, product name H)
22100GP) 100 parts (particle size = 60-250 mesonol) VC, 2,5 dimethyl 2.5 di(t-butylperoxy)hexano-3 (crosslinking agent) 2.0 parts by weight, 44
'Thiobis(3-methyl-6-ter-soyalbutylphenol) (anti-aging agent) (Daidoji [Kokagaku Uratsu Crank 3
00) Ko, add it at a ratio of 2-fold, mix it in a Henschel mixer, and impregnate it with cross-linking agent type high-density polyethylene? Manufactured. Temperature during stirring: 15℃, rotation speed: 700
rpm, stirring time 5 minutes.

Although the stirring time was varied between 2 and 20 minutes, there was no significant difference in either case.

Is it possible to use the above cross-linking agent high-strength polyethylene to make an electric cable? ! - Manufactured.

Example 1 High-density polyethylene containing a crosslinking agent obtained in this manner was coated on a mild steel stranded wire with a cross-sectional area of 200 mm.
cl; '3 parts and a half 4TIi layers (carbon blank high density polyethylene), the crosslinking agent high density polyethylene, outer semiconductive layer (carbon blank high density polyethylene)
II of LQ rnm, 6. Omm.

After extrusion to a thickness of Q, 5 mm (Q), it was then passed through a continuous crosslinking device and crosslinked with an insulating layer at 200°C.
Seven km of vinyl sheaths were manufactured.

The thermal deformation rate of the insulator for this cable was measured at 150°C and it was 15 degrees. The impulse breakdown voltage was 1150 I (V) at a gel fraction of 86 cm.

Example 2 The amount of crosslinking agent was 5.0 parts by weight, the amount of anti-aging agent was 70,
M'L'fc high-density FyL4') ethylene containing a crosslinking agent was obtained in the same manner as in Example 1 except that 5 parts by weight was added, and this and the crosslinking agent? It was blended with a pellet of high-density polyethylene without trenches at a weight ratio of 7 to 100:150 (/J), and a Ryuka caple was manufactured in the same manner as in Example 1 using the blended compound. ℃″
T:V) The heating deformation rate is 15φ.

Degree of crosslinking? With the gel fraction td87φ shown, impulse rupture I
LFE was IIQOKV.

Example 3 Low-density polyethylene (Nisseki Chemical Co., Ltd. product name: Xuron W-3000) was added to the 7-g wood used in 5A Example 2.
Pellet kloo: Blend with 200 CD perspective ratio,
A cable 1c was manufactured according to Example 1. The insulation of this cable has a heating deformation rate of 18 cm at 150°C, and a gel fraction indicating the degree of crosslinking of 88 inches. 1010 to Luz Destruction Den-O
Six in KV.

Comparative Example 1 A cable was manufactured according to Example 1 using high S7 summer polyethylene without crosslinking agent.

It was found that the heat deformation rate of the insulator of this cable was such that the insulator was exposed to heat at 150°C, and that it could not be used for long lengths at 150°C.

Comparative Example 2 Low' Pji polyethylene (Nisseki Chemical Co., Ltd. trade name Reslon W)
-300) with a crosslinking agent added (same as Example 1)
・The can was broken by extrusion to the outside of the same body. The thermal deformation of the insulator of this cable 33 was measured at 150℃ and was 25f.
Also, the gel fraction, which indicates the degree of crosslinking, was 85φ, and the innocent breakdown voltage was 740 KV.

(Effects of the Invention) In the present invention, the above-mentioned 7'ic = sea urchin is used in the powder of high-density polyethylene. It can be easily manufactured, and a high-density polyethylene insulating layer can be easily formed on the outside of the conductor by extrusion coating and subsequent heating cross-linking. It is possible to obtain an electric cable with superior resistance voltage.

[Brief explanation of the drawing]

The figure shows a cross-sectional view of an example of a power cable obtained by using the VC of the present invention. DESCRIPTION OF SYMBOLS 1... Conductor 2... Inner semiconducting layer 3... Insulating layer used in this invention 4... Outer semiconducting layer 5... Copper tape jacket 6... Sheath

Claims (1)

[Claims] 1. A method for producing an electric cable, which comprises crosslinking the conductor by extrusion coating it with an insulating compound containing powdered high-density polyethylene impregnated with a crosslinking agent.