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A semi-conductive shielding material that weakens the positive temperature coefficient effect and its preparation method

A positive temperature coefficient, semi-conductive technology, applied in the field of semi-conductive shielding material and its preparation, can solve the problems of poor thermal stability of the matrix EVA, weaken the positive temperature coefficient effect, etc., to avoid thermal decomposition and the release of acetic acid, positive temperature Weak coefficient effect, high product softness effect

Inactive Publication Date: 2018-03-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the current application of semi-conductive shielding materials for power cables, in terms of weakening the positive temperature coefficient effect of semi-conductive shielding materials as the temperature rises, there is no other solution except for increasing the amount of conductive materials; and Due to the poor thermal stability of the base EVA of the existing semi-conductive shielding material, a semi-conductive shielding material for cables based on LDPE has been prepared, and the product grade of the semi-conductive shielding material has been further developed, and the product has a significantly weakened positive temperature coefficient. effect, the product is soft and its base material has high thermal stability

Method used

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  • A semi-conductive shielding material that weakens the positive temperature coefficient effect and its preparation method

Examples

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Effect test

Embodiment 1

[0015] Example 1: Preparation of a semi-conductive shielding material that weakens the positive temperature coefficient effect

[0016] (1) First add 50.0 grams of LDPE particles to a torque rheometer at 115° C., with a rotating speed of 65 rpm, then add 25.0 grams of high-conductivity carbon black and 0.5 grams of antioxidant 1010, and melt blend for 6 minutes;

[0017] (2) 15.0 grams of binary ethylene propylene rubber was added in the mixture of (1), and melt blended for 3 minutes;

[0018] (3) Add 1.0 gram of crosslinking agent DCP, 1.5 gram of crosslinking aid TAIC and 0.5 gram of solid paraffin into the mixture of (2), melt and blend for 3 minutes, quickly take out the material from the mixer and cool to room temperature;

[0019] (4) Put the sample into a stainless steel mold with a polytetrafluoroethylene isolation film, preheat it at 180°C for 1 minute with a flat vulcanizer, mold it under a pressure of 10 MPa for 8 minutes, and then cool it on a flat vulcanizer at ro...

Embodiment 2

[0022] Example 2: Preparation of semi-conductive shielding material that weakens positive temperature coefficient effect

[0023] 55.0 grams of LDPE; 27.0 grams of high-conductivity carbon black; 1.0 grams of antioxidant 1010; 5.0 grams of butadiene rubber; 5.0 grams of SBS thermoplastic elastomer; . The rest is the same as implementation 1.

Embodiment 3

[0024] Example 3: Preparation of a semi-conductive shielding material that weakens the positive temperature coefficient effect

[0025] 55.0 grams of LDPE; 30.0 grams of highly conductive carbon black; 1.25 grams of antioxidant 1010; 5.0 grams of styrene-butadiene rubber; 1.8 grams of crosslinking agent DCP, 2.3 grams of crosslinking auxiliary agent TAIC and 1.25 grams of solid paraffin. The rest is the same as implementation 1.

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Abstract

The invention provides a semiconduction shielding material with a weakened positive temperature coefficient effect and a preparation method thereof. The semiconduction shielding material is prepared from, by weight, 50-60 parts of LDPE, 5-20 parts of elastomer, 25-35 parts of high-conductive black, 0.5-1.5 parts of antioxidant, 1.0-2.5 parts of a cross-linking agent DCP, 1.5-3.5 parts of a cross-linking aid TAIC and 0.5-1.5 parts of solid paraffin. The preparation method comprises the following steps that firstly, in a high-temperature mixer, LDPE, high-conductive black and the antioxidant are melt and mixed evenly; secondly, then nonpolar rubber or nonpolar thermoplastic elastomer is added, melted and mixed evenly; thirdly, solid paraffin, the cross-linking agent DCP and the cross-linking aid TAIC are added, melted and mixed evenly, and the material is quickly taken out of the mixer and cooled to the room temperature. The semiconduction shielding material has the remarkably-weakened positive temperature coefficient effect at the working temperature.

Description

technical field [0001] The present invention relates to a semi-conductive shielding material with weakened positive temperature coefficient effect and a preparation method thereof, in particular to a preparation of a semi-conductive shielding material with weakened positive temperature coefficient effect obtained by regulating the components of a multiphase system The method belongs to the preparation and performance research of cable shielding material. Background technique [0002] Polymer semi-conductive shielding material is widely used in the field of cable shielding. Usually, a semi-conductive shielding layer is arranged around the conductor of the cable to make the electric field evenly distributed and improve the electric strength and service life of the cable. The current common method of preparing semi-conductive shielding materials is to add a large amount of conductive carbon black to the polymer matrix to make it have a lower volume resistivity; When the cable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/16C08L91/06C08L9/00C08L9/06C08L53/02C08K13/02C08K3/04C08K5/14
CPCC08K2201/001C08L23/06C08L2205/02C08L2205/03C08L2205/035C08L2207/066C08L23/16C08L91/06C08K13/02C08K3/04C08K5/14C08L9/00C08L53/02C08L9/06
Inventor 王兆波郝春成张玉风王灿灿
Owner QINGDAO UNIV OF SCI & TECH
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