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Super-smooth high-voltage cable semi-conductive internal shielding material and preparation method thereof

A high-voltage cable, semi-conductive technology, applied in the field of semi-conductive inner shielding of ultra-smooth high-voltage cables and its preparation, can solve the problem of thermal-oxidative aging, the surface finish of the cable is difficult to meet the ultra-smooth requirements, the electrical properties and mechanical properties are difficult to meet the requirements at the same time, etc. problems, to achieve the effect of improving surface properties, good conductive network structure, and increasing wetting speed

Pending Publication Date: 2022-07-01
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages that the existing high-voltage cable semi-conductive shielding material is prone to thermal oxygen aging, the extrusion process produces pre-crosslinking, which makes the surface finish of the cable difficult to meet the ultra-smooth requirement, and the electrical and mechanical properties are difficult to meet the requirements at the same time. , and provide an ultra-smooth high-voltage cable semi-conductive inner shielding material and its preparation method

Method used

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  • Super-smooth high-voltage cable semi-conductive internal shielding material and preparation method thereof
  • Super-smooth high-voltage cable semi-conductive internal shielding material and preparation method thereof
  • Super-smooth high-voltage cable semi-conductive internal shielding material and preparation method thereof

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preparation example Construction

[0039] The present application also discloses a preparation method of the high-voltage cable semiconductive inner shielding material, the preparation method comprising the following steps:

[0040] (1) remove moisture from the conductive carbon black according to the weight ratio, mix it with the dispersant of the weight ratio, and carry out the dispersant coating treatment of the conductive carbon black;

[0041] (2) The conductive carbon black pretreatment obtained in step (1) is continuously mixed with the weight ratio coupling agent, lubricant part and antioxidant under a high-speed mixer, and the speed of the high-speed mixer is controlled within 100-200rpm. between. Then add the base material with the set weight ratio and continue to mix evenly at 45-50°C;

[0042] (3) the mixture obtained in step (2) is melt-extruded in a twin-screw extruder, extrusion temperature is 160° C., and the rotation speed of the main engine is 100 rpm, and then the pellets are obtained by wat...

Embodiment 1

[0044] As an embodiment of the present invention, a semi-conductive inner shielding material for an ultra-smooth high-voltage cable and a preparation method thereof are provided. The semi-conductive inner shielding material for high-voltage cables includes, in parts by weight, 63 parts of base material, 32 parts of conductive carbon black, 1 part of dispersant, 1 part of coupling agent, 1.5 parts of lubricant, 0.8 part of antioxidant, and 0.8 parts of cross-linking agent. 1.2 servings. The total number of the crosslinking agent and the antioxidant is 2 parts, and the mass ratio is 1.5:1.

[0045] The base material is EBA resin, the BA content is 17 wt %, the melt index at 190° C. and 2.16 kg is 8.5 g / min, and the elongation at break is 800%.

[0046] The conductive carbon black is high-purity conductive carbon black, the DBP absorption value is 148ml / 100g, the ash content is 0.2%, the 325-mesh sieve residue content is 6ppm, and does not contain impurity elements such as sulfu...

Embodiment 2

[0057] As a semi-conductive inner shielding material for ultra-smooth high-voltage cables in an embodiment of the present invention, the only difference between this embodiment and Embodiment 1 is that the total number of crosslinking agents and antioxidants is 2.2 parts (0.8 parts of antioxidants). , 1.4 parts of crosslinking agent), the mass ratio is 1.75:1.

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Abstract

The invention relates to a super-smooth high-voltage cable semi-conductive internal shielding material and a preparation method thereof, and the preparation method solves the problem that in an existing preparation method, a semi-conductive shielding material is prone to thermo-oxidative aging in the extrusion process. And in the extrusion process, the cross-linking agent is decomposed to generate pre-crosslinking, so that the degree of finish of the extrusion surface is difficult to meet the ultra-smooth requirement. The semiconductive shielding material composition is prepared from the following components in parts by weight: 55 to 65 parts of a base material, 28 to 35 parts of conductive carbon black, 0.5 to 2 parts of a dispersing agent, 1 to 2 parts of a coupling agent, 1 to 3 parts of a lubricating agent, 0.6 to 1 part of an antioxidant and 0.9 to 2 parts of a cross-linking agent. The prepared ultra-smooth high-voltage cable semi-conductive internal shielding material has excellent electrical performance and mechanical performance, and no protrusion larger than 50 micrometers exists on the extrusion surface. The method is simple in production process, low in cost and easy to popularize and use.

Description

technical field [0001] The invention belongs to the field of cross-linked polyethylene cable materials, in particular to an ultra-smooth high-voltage cable semi-conductive inner shield and a preparation method thereof. Background technique [0002] As an important part of the high-voltage cable structure, the semiconducting shielding layer plays the role of homogenizing the electric field distribution in the insulating layer, eliminating the air gap at the interface between the conductor and the insulating layer, and reducing the accumulation of space charges in the insulating layer. With the increasing demand for electricity at the user end, the power cable is developing towards higher transmission capacity and longer transmission distance, and people continue to improve the voltage resistance level of the cable. Compared with medium and low voltage cables, high voltage cables put forward higher requirements on the performance and extrusion conditions of the shielding mater...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K3/04C08K9/10C08K5/14
CPCC08K3/04C08K9/10C08K5/14C08K2201/001C08L2203/20C08L2201/08C08L23/0869
Inventor 侯帅傅明利黎小林樊灵孟贾磊贾利川展云鹏朱闻博惠宝军冯宾张逸凡徐曙巩俊强章彬张繁张成巍
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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