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Preparation method of semiconductive shielding material for 110kV and above voltage class cables

A technology of voltage level and shielding material, applied in the direction of power cable with shielding layer/conducting layer, etc., can solve the problems of easy catalytic aging by metal, short service life, product performance far from meeting semi-conductive shielding material, etc., which is not easy to achieve. The effect of blocking, reducing production cost and improving production efficiency

Active Publication Date: 2011-01-12
江阴市海江高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because the shielding material contacts the copper core, it is easy to be catalyzed and aged by the metal under high current, resulting in a short service life. This requires the shielding material to have high resistance to metal catalyzed aging, thereby prolonging its service life
[0003] Existing 35KV and below XLPE insulated power cables use ethylene vinyl acetate as the main raw material, and add general conductive carbon black and paraffin for production and processing. The need for semi-conductive shielding materials

Method used

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  • Preparation method of semiconductive shielding material for 110kV and above voltage class cables
  • Preparation method of semiconductive shielding material for 110kV and above voltage class cables
  • Preparation method of semiconductive shielding material for 110kV and above voltage class cables

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1 (the following components are parts by weight):

[0042] Step 1, get 66 parts of ethylene-acrylic acid ethyl ester resins, 31 parts of 320 mesh conductive carbon blacks (Belgian production), antioxidant 4,4-thiobis(6-tert-butyl-3-methylphenol) and bis 0.5 part of mixture of [(phenylmethylene) hydrazide] oxalic acid, (wherein bis[(phenylmethylene) hydrazide] oxalic acid content is 0.5% by weight), and the number average molecular weight is 5000~ 7500 polyethylene wax 1.5 parts, 7 # 3.5 parts of industrial white oil, 0.9 parts of ethylene glycol, 0.4 parts of titanate coupling agent and 1 part of zinc stearate were added to the tipping bucket mixer, closed and mixed for 8 minutes, and the mature rubber was mixed. Wherein the melt index of the ethylene-ethyl acrylate resin is 6, and the content of acrylic acid is 15% by weight.

[0043] Step 2: Send the kneaded cooked rubber to a reciprocating stepped extruder for secondary kneading and granulation to make a...

Embodiment 2

[0049]The difference between this embodiment and Example 1 is: 65 parts of ethylene-acrylic acid ethyl resin, 32 parts of 300 mesh conductive carbon black, antioxidant 4,4-thiobis(6-tert-butyl-3-methylphenol ) and 1 part of the mixture of bis[(phenylmethylene)hydrazide]oxalic acid, (wherein the content of bis[(phenylmethylene)hydrazide]oxalic acid is 0.4% by weight), and the molecular weight is 5000 ~7500 polyethylene wax 1 part, 7 # 3 parts of industrial white oil, 0.8 parts of ethylene glycol, 0.8 parts of titanate coupling agent, 0.5 parts of zinc stearate, and 0.4 parts of dicumyl peroxide.

Embodiment 3

[0051] The difference between this embodiment and Example 1 is: 68 parts of ethylene-acrylic acid ethyl resin, 30 parts of 320 mesh conductive carbon black, antioxidant 4,4-thiobis(6-tert-butyl-3-methylphenol ) and 0.3 parts of a mixture of bis[(phenylmethylene)hydrazide]oxalic acid, (wherein the content of bis[(phenylmethylene)hydrazide]oxalic acid is 0.6% by weight), and the molecular weight is 5000 ~7500 polyethylene wax 2 parts, 7 # 4 parts of industrial white oil, 1 part of ethylene glycol, 0.6 parts of titanate coupling agent, 1.5 parts of zinc stearate, and 0.6 parts of dicumyl peroxide.

[0052] The semi-conductive shielding material for cross-linked polyethylene insulated cables prepared by adopting the above-mentioned embodiments of the present invention meets high-strength anti-stripping force applicable to high-voltage or ultra-high-voltage cross-linked insulated cables, has super-smooth shielding effect, and has a service life of 40 to 50 years. , the extrusion p...

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Abstract

The invention relates to a preparation method of a semiconductive shielding material for 110kV and abovevoltage class cables, comprising the following steps of: with an ethylene-ethyl acrylate resin as a basic resin and conductive carbon block as a carrier, adding an oxidation Inhibitor, polyethylene wax, white oil, glycol and zinc stearate; then adding a cross-linking agent for mutual absorption and permeation after mixing, extrusion and granulation, cooling and drying; and finally carrying out pneumatic conveying and drying by using a fluidized bed to finally prepare the granular semiconductive shielding material for cross-linked polyethylene insulated cables. The shielding material prepared in the method has the advantages of better conductivity and aging resistance, favorable process extrusion and strong stripping caking property and has the micro-powder ultrafine characteristic on material fineness.

Description

(1) Technical field [0001] The invention relates to a method for preparing a semi-conductive shielding material for cables with a voltage level of 110kv and above. It is mainly used for high-voltage or ultra-high-voltage XLPE insulated power cables with a voltage level of 110KV and above. It belongs to the field of cable materials. (2) Background technology [0002] Semi-conductive shielding materials for high-voltage or ultra-high-voltage XLPE insulated power cables with a voltage level of 110kv and above, because their working environment is in high voltage and high current, it is required to balance the high electric field and keep the voltage stable, which requires The smoothness of the surface formed by the shielding material and the insulating surface achieves an ultra-smooth effect, that is, per unit cm 2 There should be no more than 2 particles larger than 25nm. And because the shielding material contacts the copper core, it is easy to be catalyzed and aged by the...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K13/02C08K3/04C08K5/098C08J3/24H01B9/02
Inventor 张国清吴海军张宁陈胜立
Owner 江阴市海江高分子材料有限公司
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