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Preparation method of ultra-smooth semiconductive shielding material for high-voltage crosslinked polyethylene insulated cable

A cross-linked polyethylene and insulated cable technology, applied in the field of semi-conductive shielding material preparation, can solve the problem that the electrical conductivity and mechanical properties are difficult to meet the requirements at the same time, the extrusion surface cannot meet the ultra-smooth requirements, and the amount of impurities in the material cannot be guaranteed. And the size meets the standard requirements, etc., to achieve the effect of good conductivity and high purity

Inactive Publication Date: 2012-02-01
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the extruded surface cannot meet the ultra-smooth requirement in the preparation of the semi-conductive shielding material, it is easy to produce gel and pre-crosslinking, and it is impossible to ensure that the quantity and size of impurities in the material meet the standard requirements. The performance is difficult to meet the requirements at the same time, and a preparation method of ultra-smooth semi-conductive shielding material for high-voltage XLPE insulated cables is provided

Method used

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Effect test

specific Embodiment approach 1

[0017] Specific embodiment one: The preparation method of the ultra-smooth semi-conductive shielding material for high-voltage cross-linked polyethylene insulated cables in this embodiment is carried out according to the following steps: 1. Weigh 5 to 15 parts of polyethylene resin, 50 to 60 parts of Ethylene-vinyl acetate polymer, 25-35 parts of conductive carbon black, 0.1-0.3 parts of antioxidant and 0.5-1.0 parts of crosslinking agent;

[0018] 2. Add the weighed polyethylene resin, ethylene-vinyl acetate polymer, antioxidant and conductive carbon black into the mixer at the same time, and mix evenly at a temperature of 130-200°C to obtain the material;

[0019] 3. The material enters the melt pump, and the melt pump makes the material flow through the double-station hydraulic screen changer filter for filtration, and the filtered material enters the single-screw granulator for granulation, and the obtained granules are cooled by pure water and transported Go to the centri...

specific Embodiment approach 2

[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 5 parts of polyethylene resin, 50 parts of ethylene-vinyl acetate polymer, 25 parts of conductive carbon black, 0.1 part of Antioxidant and 0.5 parts of crosslinking agent. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, 15 parts of polyethylene resin, 60 parts of ethylene-vinyl acetate polymer, 35 parts of conductive carbon black, 0.3 parts of of antioxidant and 1.0 part of crosslinking agent. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a preparation method of an ultra-smooth semiconductive shielding material for a high-voltage crosslinked polyethylene insulated cable, which relates to a preparation method of a semiconductive shielding material and is used for solving the problems that an extruding surface cannot meet the requirement of ultra-smoothness, gelation and pre-crosslinking are caused easily, and the quantity and sizes of impurities in the material cannot meet the standard requirements existing in the preparation of a semiconductive shielding material. The method comprises the following steps of: weighing raw materials; uniformly mixing polyethylene rein, an ethylene-vinyl acetate polymer, an antioxidant and conductive carbon black to obtain a material; filtering the material, pelletizing, dehydrating and drying the filtered material, and mixing with a crosslinking agent to obtain particles mixed with the crosslinking agent; and feeding into an absorption cabin for uniformizing, and cooling. In the invention, gelation and pre-crosslinking are not caused in the production process; the quantity and sizes of impurities in the semiconductive shielding material reach the levels of imported products of the same type; every kilogram of cable materials contain less than ten impurities of 70-100 mum; the requirement of ultra-cleanliness is met; and the extruding surface meets the requirement of ultra-smoothness.

Description

technical field [0001] The invention relates to a preparation method of a semiconductive shielding material. Background technique [0002] Due to the high electric field strength in the insulation structure of the high-voltage cable, any tiny defect on the surface of the semi-conductive shielding layer will cause a strong partial discharge, triggering electrical trees, which gradually grow, and eventually lead to insulation breakdown of the high-voltage cable. Therefore, high requirements are placed on the performance of semi-conductive shielding materials for high-voltage cables, and the extruded surface must be ultra-smooth. [0003] At present, there are two problems in the preparation of semi-conductive shielding materials for high-voltage XLPE insulated cables: one is that the formula of ultra-smooth semi-conductive shielding materials is not perfect, and it cannot guarantee the excellent extrusion processing performance of semi-conductive shielding materials for high-v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06C08K3/04C08K5/14C08K5/20
Inventor 韩宝忠赵洪李长明王暄
Owner HARBIN UNIV OF SCI & TECH
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