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
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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

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

Examples

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Example Embodiment

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

[0037] In the above preparation method, when the components of the polyolefin resin composition other than the initiator are melt-extruded, these components can be sufficiently melted and uniformly dispersed, and the initiator can be prevented from premature crosslinking.

[0038] The application fields of the polyolefin resin composition of the present invention are not particularly limited, including various fields that require insulation, such as the manufacture of cable sheaths or sheets of sheaths. This resin composition is especially suitable for the insulating sheath or sheath of DC transmission cables.

[0039] The insulating material for DC power ...

Example Embodiment

[0042] Example 1

[0043] 88 parts by mass of low-density polyethylene (density 0.922g / cm 3 , The melt index is 2.0g / 10min), 5 parts by mass of maleic anhydride grafted modified low-density polyethylene (the melt index is 1.3g / 10min (190℃, 2.16kg), the grafting rate is 1.3), 5 mass Parts of 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) Premix homogeneously at a temperature of 130-200°C, and then extrude and pelletize through a twin-screw extruder. Then, 3 parts by mass of benzoyl peroxide were added to absorb and homogenize sufficiently to obtain a particulate polyolefin resin composition.

Example Embodiment

[0044] Example 2

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

[0046] Mix 200 parts by mass of the masterbatch obtained above, 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. The process temperature is 115-200°C. between. Then, 1 part by mass of the initiator benzoyl peroxide is added to fully absorb and...

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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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