Graphene-containing polyolefin high semiconductive shielding material for cables and preparation method thereof

A graphene and polyolefin technology, applied in the field of medium and high voltage power transmission and distribution cable materials and their preparation, can solve the problems of insufficient particle size, unsatisfactory carbon black conductivity, unsatisfactory cable shielding and equalizing electric field effect, etc. Improve electrical properties, increase the effect of the homogenizing electric field, increase the effect of the homogenizing electric field

Active Publication Date: 2016-06-01
JIANGSU ZHONGCHAO HOLDING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, semi-conductive shielding materials for cross-linked cables are mainly made by uniformly dispersing conductive carbon black in ethylene-vinyl acetate copolymer EVA. The volume resistivity of the semi-conductive shielding material is between 40-100Ω·cm, and the smoothness of the surface of the material is not good enough, so the effect on the cable shielding homogenization electric field is not ideal, especially for high-voltage and ultra-high-voltage cables.

Method used

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  • Graphene-containing polyolefin high semiconductive shielding material for cables and preparation method thereof
  • Graphene-containing polyolefin high semiconductive shielding material for cables and preparation method thereof
  • Graphene-containing polyolefin high semiconductive shielding material for cables and preparation method thereof

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preparation example Construction

[0025] The preparation method of the polyolefin high semiconductive shielding material (shielding material) containing graphene for cables of the present invention, such as figure 1 shown, including the following steps:

[0026] 1. Mixing, ethylene-vinyl acetate copolymer EVA, graphene powder with a particle size not greater than 10 μm, white oil, antioxidant 4,4'-thiobis(6-tert-butyl-3-methylphenol) and zinc stearate, respectively loaded into the raw material warehouse through the upper hopper, and continuously weighed with a weight loss weighing scale. , graphene powder 3%~10%, white oil 3%~6%, antioxidant 0.5%~1%, zinc stearate 0.3%~0.6%, added to WF140- In the mixing zone of the 180-type reciprocating mixing extrusion granulation unit, stir and mix at a speed of 150-200rpm for 1-2 minutes to obtain a uniformly mixed mixture.

[0027] The WF140-180 reciprocating mixing extrusion granulation unit used in this example is a set of multi-functional continuous equipment, which...

Embodiment 1

[0044] 1. The mass percentage content is: EVA83%, graphene powder 10%, white oil 6%, antioxidant 0.5%, zinc stearate 0.5%. Stir and mix at 150 rpm for 2 minutes.

[0045] 2. For the first plasticization, the screw speed is controlled at 180rpm / min, and the first plasticization temperature is:

[0046] zone 1

Zone 2

District 3

District 4

District 5

85

105

115

100

90

[0047] For the second plasticization, the screw speed is 120rpm, and the second plasticization temperature is:

[0048] zone 1

Zone 2

nose

85

85

105

[0049] 3. The temperature is 105° C., the pressure is 5.0 MPa, and cylindrical particles with a diameter of 3.5 mm and a height of 3 mm are made.

[0050] 4. The rotating speed is 1080rmp, the time is 23min, dehydration.

[0051] 5. Fluidized bed drying, drying at 50°C, cooling, and screening to obtain graphene-containing polyolefin high semiconductive shielding materia...

Embodiment 2

[0053] 1. The mass percentage content is: EVA resin 86%, graphene powder 7%, white oil 5.4%, antioxidant 1%, zinc stearate 0.6%. Stir and mix at 200 rpm for 1 minute.

[0054] 2. For the first plasticization, the screw speed is controlled at 200rpm / min, and the first plasticization temperature is:

[0055] zone 1

Zone 2

District 3

District 4

District 5

87

108

120

103

92

[0056] For the second plasticization, the screw speed is 150rpm, and the second plasticization temperature is:

[0057] zone 1

Zone 2

nose

87

89

107

[0058] 3. The temperature is 107° C., the pressure is 6.5 MPa, and cylindrical particles with a diameter of 3.5 mm and a height of 3 mm are made.

[0059] 4. The rotating speed is 1140rpm, the time is 25min, dehydration.

[0060] 5. Fluidized bed drying, drying at 48°C, cooling, and screening to obtain graphene-containing polyolefin high semiconductive shielding ...

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Abstract

The invention discloses a graphene-containing polyolefin high semi-conductive shielding material for a cable and a preparation method thereof and aims at reducing the volume resistivity of the semi-conductive shielding material. The shielding material disclosed by the invention comprises the following components in percentage by weight: 83%-90% of ethylene-vinyl acetate copolymer, 3%-10% of graphene powder, 3%-6% of white oil, 0.5%-1% of antioxidant and 0.3%-0.6% of zinc stearate. The preparation method disclosed by the invention comprises the steps of mixing, plasticizing, granulating, dehydrating and drying. Compared with the prior art, graphene is uniformly dispersed into the ethylene-vinyl acetate copolymer, so that the volume resistivity is reduced to below 30 omega. cm, a homogeneous electric field is greatly improved, smooth and gapless contact of a conductor, an insulation layer and a metal shielding layer is realized, the effect of shielding the homogeneous electric field of the cable is improved, the electrical performance and the long-term operation reliability of the cable are improved, and the shielding material is suitable for non-metal shielding layers of the cables of above 6kV.

Description

technical field [0001] The invention relates to a medium and high voltage transmission and distribution cable material and a preparation method thereof, in particular to a semi-conductive shielding material for cables and a preparation method thereof. Background technique [0002] Medium and high voltage XLPE insulated cables (XLPE cables) are a type of power cables that are widely used in the field of power transmission and distribution. At present, semi-conductive shielding materials for cross-linked cables are mainly made by uniformly dispersing conductive carbon black in ethylene-vinyl acetate copolymer EVA. The volume resistivity of the semi-conductive shielding material is between 40-100Ω·cm, and the smoothness of the surface of the material is not good enough, so the effect on the cable shielding homogenization electric field is not ideal, especially for high-voltage and ultra-high-voltage cables. Contents of the invention [0003] The object of the invention is to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K13/02C08K3/04C08K5/01C08K5/098C08K5/375B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/875B29C48/92B29C2948/92514B29C2948/9259B29C2948/92619B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 温鹏杨飞张乃明杨培杰霍振平
Owner JIANGSU ZHONGCHAO HOLDING CO LTD
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