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Insulating material for high-voltage cable and preparation method thereof

A cable and composition technology, which is applied in the field of cable insulation materials and cables, can solve the problems that the impurity content of the product cannot meet the design requirements, and achieve the effect of improving the cleanliness

Active Publication Date: 2012-07-04
ZHEJIANG WANMA MACROMOLECULE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method may lead to pre-crosslinking of the mixed material, and the impurity content and other indicators of the product obtained by this method cannot meet the design requirements for the manufacture of high-voltage and ultra-high-voltage insulating materials.

Method used

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  • Insulating material for high-voltage cable and preparation method thereof

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preparation example Construction

[0021] According to the preparation method of the polyolefin resin composition provided by the present invention, the method includes: under ambient conditions, mixing, homogenizing and devolatilizing the polyolefin and the antioxidant at a temperature of 150°C to 200°C to obtain Molten the material; the molten material is filtered at 180-230°C, then dehydrated, dried, and then mixed with the crosslinking agent.

[0022] The method specifically includes adding polyethylene, antioxidants and optional additives to a twin-screw extruder according to their mass ratios, and then fully mixing, dispersing, homogenizing and devolatilizing, and then preparing a molten material ; After the molten material is filtered through a 300-500 mesh filter, it is water-ring pelletized, and then dehydrated by a dehydrator to obtain a granular premix. The dense phase of the mixture is transported to a boiling drying bin for drying and temperature control, using dialysis The dry and temperature-control...

Embodiment 1

[0031] At air pressure of 12.5N / m 2 , Air cleanliness, the number of dust particles (dust) is less than 0.33×10 8 Nr / m 3 , The environment temperature is 20 ℃, the relative humidity is below 85%, 100 parts by mass of polyethylene (density 0.922g / cm 3 , Melt index 1.9g / 10min (190℃, 2.16kg)), 0.2 parts by mass of antioxidant 300 as the main antioxidant, and 0.04 parts by mass of the antioxidant DSTP as auxiliary antioxidant through the loss-in-weight metering feeding device It is added to the twin-screw extruder to fully mix, disperse, homogenize and devolatilize to obtain molten material. The screw temperature is set to 110℃, 130℃, 150℃, 170℃, 180℃, 180℃ and 180°C.

[0032] The molten material is filtered through a 500-mesh filter screen, and then water ring pelletizing is performed, and the temperature at the filtering point is set to 190°C and 190°C.

[0033] The granular premix is ​​dehydrated by a dehydrator, and the premix is ​​densely transported to a boiling drying bin for dy...

Embodiment 2

[0036] Except changing the polyethylene to polyethylene with a melt index of 2.0g / 10min (190℃, 2.16kg), the amount of the main antioxidant is changed to 1 part by mass, the amount of auxiliary antioxidant is changed to 2 parts by mass, and crosslinking Except that the amount of the agent DCP was changed to 5 parts by mass, a polyolefin resin composition was prepared according to the same method as in Example 1.

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Abstract

The invention provides an insulating material for a high-voltage cable and a preparation method thereof. A polyolefin resin composition comprises polyolefin, an antioxidant and a cross-linking agent, wherein the sizes of impurities in the polyolefin resin composition are below 100 mum; the tensile strength is over 17MPa, and the volume resistivity is over 1.0*1015 omega.m. The invention further provides an insulating material for a cable and the cable. The sizes of the impurities in the polyolefin resin composition are below 100 mum (in a sample of 1,000g), the tensile strength is over 17Mpa, and preferably up to 30Mpa, the size resistivity is over 1.0*1015 omega.m, and preferably up to 5.5*1015 omega.5, and the insulating method can be applied to an insulating layer of a power cable of 35kV, particularly 110-500kV.

Description

Technical field [0001] The present invention relates to a polyolefin resin composition, and also relates to an insulating material for cables and a cable containing the resin composition. Background technique [0002] Since its introduction in the 1950s, cross-linked polyethylene (XLPE) has been widely used in power transmission and distribution systems due to its excellent performance, simple manufacturing process, and easy maintenance. [0003] At present, the cross-linked polyethylene insulating material manufactured in my country is generally only used for the insulating layer of power cables below 35kV. The manufacturing method is to mix the components of the insulating material such as polyethylene, antioxidant and cross-linking agent together and melt and extrude to obtain the final insulating material. This method may cause pre-crosslinking of the mixed material, and the impurity content of the product prepared by this method cannot meet the design requirements of high-vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08L23/06C08K5/14H01B3/44
Inventor 何军刘美兵洪向明冯本青
Owner ZHEJIANG WANMA MACROMOLECULE MATERIAL
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