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A heat shrinkable stress tube and its production process

A technology of stress tube and heat shrinkage, applied in the direction of plastic/resin/wax insulators, conductors, organic insulators, etc., can solve problems such as poor processing performance, partial discharge of cable accessories, unstable dielectric constant and volume resistivity, etc., to achieve Improve the production environment, good moisture resistance, improve reliability and stability

Active Publication Date: 2016-01-13
HONGSHANG HEAT SHRINKABLE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the materials and processes used for heat-shrinkable stress tubes are prone to moisture absorption, poor processability, unstable or large deviations in dielectric constant and volume resistivity in electrical properties, and due to the difficulty of processing materials, so far, at present The production process of the manufacturer cannot implement one-time mass production
The processing performance and electrical performance problems mentioned above are the most likely to cause partial discharge of the cable accessories, so long-term operation will cause the cable accessories to be broken down.

Method used

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  • A heat shrinkable stress tube and its production process
  • A heat shrinkable stress tube and its production process
  • A heat shrinkable stress tube and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 30 parts of chlorinated polyethylene (CPE), (chlorine content: 35±1); 20 parts of low-density polyethylene (LDPE), melt index: 1.8g / 10min; 15 parts of modified barium titanate, silane coupling agent Modification; 9 parts of carbon black for rubber; 2 parts of heat stabilizer tribasic lead sulfate, 2 parts of dibasic lead phosphite; 1 part of lubricant stearic acid, 1 part of polyethylene wax; high-strength silicone rubber 2 parts; 0.5 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester; 0.5 parts of anti-aging agent; 0.5 parts of sensitizer (TMPTA), mixed to obtain mixture. Use part of the above mixture to make a concentrated material with an internal mixer; then pour another part of the material and the concentrated material into a color mixer and mix for 5-10 minutes, and then directly use a reciprocating single-screw granulator at 100-140 degrees Celsius The masterbatch is produced twice. Before the second production, the m...

Embodiment 2

[0029] 35 parts of Evapine rubber (EVM); 20 parts of low-density polyethylene (LDPE), melt index: 3.0g / 10min; 30 parts of modified barium titanate, modified by silane coupling agent; 10 parts of carbon black for rubber ; 2 parts of heat stabilizer tribasic lead sulfate, 2 parts of epoxy soybean oil; 1 part of lubricant stearic acid, 1 part of polyethylene wax; 1.5 parts of high-strength silicone rubber; four [β-(3,5- 0.5 part of di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester; 0.5 part of anti-aging agent; 0.5 part of sensitizer (TMPTA), and mix to obtain a mixture. Use part of the above mixture to make a concentrated material with an internal mixer; then pour another part of the material and the concentrated material into a color mixer and mix for 5-10 minutes, and then directly use a reciprocating single-screw granulator at 100-140 degrees Celsius The masterbatch is produced twice. Before the second production, the material needs to be poured into the mixer ...

Embodiment 3

[0031] 20 parts of chlorinated polyethylene (CPE), (chlorine content: 35±1); 25 parts of Evapine rubber (EVM); 10 parts of low-density polyethylene (LDPE), melt index: 1.8g / 10min; modified 25 parts of barium titanate, modified by silane coupling agent; 11 parts of carbon black for rubber; 2 parts of heat stabilizer tribasic lead sulfate, 2 parts of dibasic lead phosphite; 1 part of lubricant stearic acid, poly 1 part of ethylene wax; 2 parts of high-strength silicone rubber; 0.5 part of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester; 0.5 part of anti-aging agent; sensitization Agent (TMPTA) 0.5 part, mixed to obtain a mixture. Use part of the above mixture to make a concentrated material with an internal mixer; then pour another part of the material and the concentrated material into a color mixer and mix for 5-10 minutes, and then directly use a reciprocating single-screw granulator at 100-140 degrees Celsius The masterbatch is produced twi...

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Abstract

The invention provides a hot-shrinkable stress tube and a production technology, the hot-shrinkable stress tube comprises the following components by weight: ethyl vinylacetate rubber, chlorinated polyethylene, low density polyethylene, modified barium titanate, carbon black, a heat stabilizer, a lubricating agent, silicon rubber, an antioxidant, an anti-aging agent and a sensitizing agent. The hot-shrinkable stress tube has good moisture-proof performance, and can increase the reliability and stability of an electric cable accessory while being operated.

Description

technical field [0001] The invention relates to the technical field of electric power materials, in particular to a radiation cross-linked heat-shrinkable stress tube and a production process thereof. Background technique [0002] Electrical stress control (stress tube) is to solve the concentration of electric field stress at the fracture of the outer shielding layer of the accessory terminal of the medium and high voltage power cable, as well as at the fracture of the outer shielding layer of the cable intermediate joint and at the insulation cut-off of the cable end, so that the electric field distribution and electric field intensity are at the optimum. Optimal condition, thereby improving the reliability and service life of the cable accessories. At present, the materials and processes used for heat-shrinkable stress tubes are prone to moisture absorption, poor processing performance, unstable dielectric constant and volume resistivity in electrical properties or too la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L31/04C08L23/28C08L23/06C08K13/06C08K9/00C08K3/24C08K3/04C08K5/103C08K5/29C08J3/22C08J3/28C08J3/24H01B7/28H01B3/44H01B3/28
Inventor 钟晓光肖国常翟永爱
Owner HONGSHANG HEAT SHRINKABLE MATERIALS