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Insulating material for high-voltage direct-current feeder cable

A technology of maleic anhydride and composition, applied in the field of DC transmission cable insulation material and DC transmission cable, can solve the problems of easy agglomeration, unsuitable mixing of polyolefins, easy to produce polarization effect, etc., to achieve strong resistance to voltage mutation, The effect of strong ability

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

Problems solved by technology

[0009] At present, the main problems in the production of HVDC cable insulation materials are: (1) There are many types of polyolefins on the market, so it is very important to choose a base material suitable for HVDC cable insulation materials; (2) ) Due to the unfavorable dispersion and easy agglomeration of nano-inorganic materials such as magnesium oxide, it is also a problem that it should not be mixed evenly with hydrophobic polyolefins; Charge, when the content is too much, it is easy to produce a polarization effect, so it is necessary to properly handle the amount of maleic anhydride graft-modified polyolefin, and the residual amount of maleic anhydride in the maleic anhydride graft-modified polyolefin is also a factor. important issue, so it is necessary to select the appropriate maleic anhydride graft modified polyolefin

Method used

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  • Insulating material for high-voltage direct-current feeder cable
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  • Insulating material for high-voltage direct-current feeder cable

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preparation example Construction

[0036] The preparation method of the polyolefin resin composition provided by the present invention comprises: mixing polyolefin, maleic anhydride graft-modified polyolefin, and a copolymer of maleic anhydride and olefin at a temperature of 130-200°C, and extruding out of granulation; then mixed with the initiator evenly.

[0037] In the above preparation method, when melt-extruding the components of the polyolefin resin composition other than the initiator, it is possible to sufficiently melt and uniformly disperse these components and prevent premature crosslinking of the initiator.

[0038] The field of application of the polyolefin resin composition of the present invention is not particularly limited, and includes various fields requiring insulation, such as the manufacture of sheets for cable sheaths or sheaths. This resin composition is especially suitable for the insulating sheath or sheath of direct current transmission cables.

[0039] The invention provides an insu...

Embodiment 1

[0043] 88 parts by mass of low-density polyethylene (density of 0.922g / cm 3 , melt index is 2.0g / 10min), 5 parts by mass of maleic anhydride graft-modified low-density polyethylene (melt index is 1.3g / 10min (190°C, 2.16kg), grafting rate is 1.3), 5 parts by mass Parts polyisobutylene succinic anhydride (density 900g / cm 3 , the kinematic viscosity is 800m 2 / s, the molar ratio of maleic anhydride to isobutylene is 5:95) pre-mixed uniformly at a temperature of 130-200°C, and then extruded and granulated through a twin-screw extruder. Then add 3 parts by mass of benzoyl peroxide, fully absorb and homogenize, and obtain a granular polyolefin resin composition.

Embodiment 2

[0045] 30 mass parts of polyisobutylene succinic anhydride (density of 900g / cm 3 , the kinematic viscosity is 800m 2 / s, the molar ratio of maleic anhydride to isobutylene is 10:90) and 100 parts by mass of low density polyethylene (density 0.922g / cm 3 , melt index is 2.1g / 10min) and 30 parts by mass of maleic anhydride graft-modified low-density polyethylene (melt index is 1.5g / 10min (190°C, 2.16kg), grafting rate is 1.2) to make poly The mass content of isobutylene succinic anhydride is 18.75% of the masterbatch, and the process temperature of the internal mixer is 120-130°C.

[0046] Mix 200 parts by mass of the masterbatch obtained above with 500 parts by mass of the same polyethylene as above, and 5 parts by mass of antioxidant 300, and extrude and granulate through a twin-screw extruder at a process temperature of 115-200°C between. Then add 1 mass part of initiator benzoyl peroxide, fully absorb and homogenize, and obtain a granular polyolefin resin composition.

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Abstract

The invention provides a polyolefin resin composition and a preparation method thereof. The polyolefin resin composition comprises polyolefin, maleic anhydride graft modified polyolefin, a copolymer of maleic anhydride and olefin, and an initiator. The invention further provides an insulating material for a direct-current feeder cable and the direct-current feeder cable. According to the polyolefin resin composition provided by the invention, the composition is free from space charge during testing of space charge. According to the preparation method provided by the invention, the pre-crosslinking of each component of the polyolefin resin composition is minimized, the electrode reversion times are very high and can be over 130 times, high voltage leap resistance is provided under the condition of direct-current pre-pressing, and the requirement of an ultra-high-voltage direct-current feeder cable insulating material is met.

Description

technical field [0001] The present invention relates to a polyolefin resin composition, and also relates to an insulating material for a direct current transmission cable and a direct current transmission cable comprising the polyolefin resin composition. Background technique [0002] Compared with AC transmission technology, DC transmission technology has significant advantages in terms of stability and economy, as shown in: [0003] (1) In terms of stability: DC transmission is not restricted by the stability of synchronous operation, and plays a great role in ensuring the stable operation of the AC power grid at both ends; the use of DC transmission can realize asynchronous interconnection between domestic regional networks or international networks , divide the large system into several AC systems that can obtain networking benefits and be relatively independent, avoiding the problems caused by the AC power system with too large total capacity; when the AC power system i...

Claims

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Application Information

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IPC IPC(8): C08L23/00C08L23/06C08L51/06C08L23/22B29B9/06H01B3/44H01B9/00
Inventor 何军陈文卿
Owner ZHEJIANG WANMA MACROMOLECULE MATERIAL
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