Insulating material for high-voltage cable and preparation method thereof

A cable and material technology, applied in the field of polyolefin resin composition, can solve the problem that the impurity content of the product cannot meet the design requirements, and achieve the effect of improving the cleanliness

Active Publication Date: 2014-06-18
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

Examples

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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 comprises: mixing, homogenizing and devolatilizing polyolefin and antioxidant at a temperature of 150°C-200°C under ambient conditions to obtain Molten material; the molten material is filtered at 180-230°C, then dehydrated, dried, and then mixed with a cross-linking agent.

[0022] Specifically, the method is as follows: adding polyethylene, antioxidant and optional additives according to their mass ratio to a twin-screw extruder for full mixing, dispersion, homogenization and devolatilization to obtain a molten material ; After the molten material is filtered through a 300-500 mesh filter mesh, it is granulated in a water ring, and then dehydrated by a dehydrator to obtain a granular premix. The method is to fully mix the dried and temperature-controlled granular premix with the liquid crosslinking agent so that the premix can fully absorb the liquid c...

Embodiment 1

[0031] At an air pressure of 12.5N / m 2 , the number of dust particles (dust) in the air cleanliness is lower than 0.33×10 8 Nr / m 3 , the ambient temperature is 20 ℃, and the relative humidity is under the environmental conditions of 85% or less, with 100 mass parts of polyethylene (density 0.922g / cm 3 , melt index 1.9g / 10min (190 ° C, 2.16kg)), 0.2 mass parts of antioxidant 300 as the main antioxidant and 0.04 mass parts of antioxidant DSTP as the auxiliary antioxidant through the loss-in-weight metering feeding device Put it into a twin-screw extruder for full mixing, dispersion, homogenization and devolatilization to obtain a molten material. The screw temperature is set at 110°C, 130°C, 150°C, 170°C, 180°C, 180°C and 180°C.

[0032] The molten material is filtered through a 500-mesh filter, followed by water ring cutting, and the temperature at the filter is set at 190°C and 190°C.

[0033] The granular premix is ​​obtained by dehydration with a dehydrator, and the premix...

Embodiment 2

[0036] In addition to changing polyethylene to polyethylene with a melt index of 2.0g / 10min (190°C, 2.16kg), the amount of primary antioxidant to 1 mass part, the amount of auxiliary antioxidant to 2 mass parts and crosslinking Except that the consumption of the agent DCP was changed to 5 parts by mass, the polyolefin resin composition was prepared in the same manner 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 electric cables and electric cables comprising the resin composition. Background technique [0002] Since its appearance 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 our country is generally only used for the insulating layer of power cables below 35kV. Its manufacturing method is to mix and extrude the components of the insulating material such as polyethylene, antioxidant and cross-linking agent together to obtain the final insulating material. 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 mee...

Claims

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Application Information

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Patent Type & Authority Patents(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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