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Method for producing ultra-clean cross-linkable polyethylene insulating material

A technology of cross-linked polyethylene and insulating materials, which is applied in the direction of organic insulators, plastic/resin/wax insulators, etc. It can solve the problems that the content of impurities cannot meet the design requirements, and the remaining materials are pre-crosslinked, so as to avoid excessive heating time , the effect of avoiding pollution

Active Publication Date: 2011-12-28
QINGDAO HANHE CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the insulating material produced by this method can lead to pre-crosslinking of residual materials, and the indicators such as impurity content cannot meet the design requirements.

Method used

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  • Method for producing ultra-clean cross-linkable polyethylene insulating material
  • Method for producing ultra-clean cross-linkable polyethylene insulating material
  • Method for producing ultra-clean cross-linkable polyethylene insulating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add low-density polyethylene with a formula content of 99.6% and a melt index of 2.1g / 10min into silo 1; add an antioxidant with a content of 0.4% and a melting point of 85°C into hopper 2, and pass it through a weight-loss metering feeding device 3 , enter the metal separator 4, carry out metal screening, and then enter the high-efficiency GSX twin-screw extruder 5, the temperature of each section from the metal separator 4 to the filter screen 8 is 100°C, 110°C, and 120°C in sequence. Start the extruder 5 to fully knead, disperse, homogenize and devolatilize the low-density polyethylene and the antioxidant to obtain a melt.

[0021] The mixed molten material passes through the steering valve 6, the gear pump 7 and the filter screen 8 in turn. The filter screen 8 is equipped with a multi-layer stainless steel filter screen layer, and then passes through the underwater pelletizer 9 to make the molten material into granular ultra-clean pre- Mixture.

[0022] The ultra-c...

Embodiment 2

[0026] Add low-density polyethylene with a formula content of 98.8% and a melt index of 1.5g / 10min into silo 1; an antioxidant with a content of 1.2% and a melting point of 80°C is added to hopper 2 and passed through a weight-loss metering feeding device 3 , enter the metal separator 4, carry out metal screening, and then enter the high-efficiency GSX twin-screw extruder 5, the temperature of each section from the metal separator 4 to the filter screen 8 is 90°C, 100°C, and 110°C in sequence. Start the extruder screw to fully mix, disperse, homogenize and devolatilize the low-density polyethylene and antioxidant.

[0027] The mixed molten material passes through the steering valve 6, the gear pump 7 and the filter screen 8 in turn. The filter screen 8 is equipped with a stainless steel multi-layer filter screen in the screen changer, and then passes through the underwater pelletizer 9 to make the molten material into granular super Net premix.

[0028] The ultra-clean premix...

Embodiment 3

[0030] Add low-density polyethylene with a formula content of 99.8% and a melt index of 2.5g / 10min into silo 1; add an antioxidant with a content of 0.2% and a melting point of 90°C into hopper 2, and pass it through a weight-loss metering feeding device 3 , enter the metal separator 4, carry out metal screening, and then enter the high-efficiency GSX twin-screw extruder 5, and the temperature of each section from the metal separator 4 to the filter screen 8 is 140 ° C in turn. Start the extruder screw to fully mix, disperse, homogenize and devolatilize the low-density polyethylene and antioxidant.

[0031] The mixed molten material passes through the steering valve 6, the gear pump 7 and the filter screen 8 in turn. The filter screen 8 is equipped with a stainless steel multi-layer filter screen in the screen changer, and then passes through the underwater pelletizer 9 to make the molten material into granular super Net premix.

[0032] The ultra-clean premix is ​​transporte...

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Abstract

The invention relates to a production method for producing cable insulation material by using ethylenes resin. The production method of the ultra clean cross bond ethylene insulation material comprises following steps: polyethylene and chemical inhibitor are fully mixed to prepare a mixture; the mixture is added into a double screw extruder for full mixing; after homogenization and evolatilization, melted material is prepared; after the melted materials are filtered, an underwater particle slicing is carried out to prepare particle shaped ultra clean premixture; then the particle shaped ultra clean premixture is dried; then the particle shaped ultra clean premixture is filtered; the particle shaped ultra clean premixture and peroxide is fully mixed and separated;then then the ultra clean cross bond ethylene insulation material is prepared; the packing is carried out. Since the use of subsequent method production technology by the invention, thus overcoming defects of cross bonding in advance initiated by peroxide in regular production, avoiding over long time of heating of materials during physical distribution and current carrying at a dust gauze and avoiding materials from being polluted.

Description

technical field [0001] The invention relates to a method for manufacturing cable insulating material, in particular to a method for manufacturing cable insulating material made of vinyl resin. Background technique [0002] At present, the cross-linkable polyethylene insulating materials manufactured in our country are generally only used for the insulation layer of power cables of 35kV and below. Cross-linking, the impurity content and other indicators of the product obtained by this method cannot meet the design requirements, and it is not suitable for the manufacture of high-voltage and ultra-high-voltage insulating materials. [0003] Such as the Chinese patent disclosed on April 19, 2006, the publication number is CN1760251A, which discloses a cross-linkable peroxide low-density polyethylene plastic and its preparation method. It adopts a high-efficiency antioxidant with a high melting point to combine high The antioxidant at the melting point is dissolved by the cross-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/44C08L23/06C08J3/20B29C47/36B29C48/40
CPCB29C47/369B29C47/40B29C48/39B29C48/40
Inventor 张承官陈沛云
Owner QINGDAO HANHE CABLE