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Liquid silicone rubber composition for cold shrink cable and preparation method of liquid silicone rubber composition

A technology of liquid silicone rubber and composition, applied in the field of liquid silicone rubber composition for cold shrinkable cable and its preparation, can solve the problem of improving the tracking resistance and electrical insulation strength, the liquid silicone rubber composition does not meet the requirements, mechanical The performance cannot fully meet the needs and other problems, so as to improve the ablation resistance, improve the tracking resistance, and improve the tracking resistance.

Inactive Publication Date: 2018-03-30
ZHEJIANG XINAN CHEM INDAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two problems in domestic liquid silicone rubber: 1) The electrical properties are not excellent enough, and the tracking resistance and electrical insulation strength still need to be improved
2) The mechanical properties cannot fully meet the requirements, especially the higher requirements for tear strength and elongation deformation rate
[0011] However, the current high-voltage cable applications require both excellent tracking resistance and excellent physical properties, and none of the above liquid silicone rubber compositions can meet the requirements.

Method used

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  • Liquid silicone rubber composition for cold shrink cable and preparation method of liquid silicone rubber composition

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preparation example Construction

[0043] A preparation method of a liquid silicone rubber composition for cold-shrinkable cables, comprising the following steps:

[0044] (1) Base rubber preparation: 100 parts by mass of vinyl polydimethylsiloxane, 20-50 parts by mass of fumed silica, 5-15 parts by mass of silazane, and 0.1-3 parts by mass of hydroxyl silicone oil In the internal mixer, mix evenly at low temperature first, then raise the temperature to 150°C and mix for 3 hours, cool down to get the base rubber;

[0045] (2) AB glue preparation: 100 parts by mass of the base glue obtained in step (1), plus 1-5 parts by mass of high vinyl silica gel, 5-30 parts by mass of vinyl polysiloxane, and 0.01-10 parts by mass of anti-aging additives Parts by mass, 0.001-0.5 parts by mass of the platinum catalyst were placed in a planetary mixer and mixed evenly to obtain glue A; then 100 parts by mass of the base glue obtained in step (1), plus 5-30 parts by mass of vinyl polysiloxane, -10 parts by mass of cross-linkin...

Embodiment 1

[0048] The invention discloses a liquid silicone rubber composition for cold-shrinkable cables, which comprises the following components in parts by mass: 100 parts by mass of vinyl polydimethylsiloxane, 5 parts by mass of high vinyl silicone oil, and 5 parts by mass of crosslinking agent 0.01 parts by mass of anti-aging additive, 50 parts by mass of fumed silica, 1.1 parts by mass of phenyl silicone oil with high phenyl content, 0.001 parts by mass of aminobenzotriazole or its derivatives, 0.5 parts by mass of platinum catalyst , 0.25 parts by mass of inhibitor.

[0049] In this embodiment, the vinyl polydimethylsiloxane is a polydimethylsiloxane containing vinyl units in its molecule or a mixture of polydimethylsiloxanes with different viscosities. The polydimethylsiloxane has a viscosity of 10,000-150,000 mpas at 25° C., and a vinyl content of 0.1-0.3%. The crosslinking agent is an organopolysiloxane containing at least two Si-H bonds or a mixture of silanes with different...

Embodiment 2

[0056] The invention discloses a liquid silicone rubber composition for cold-shrinkable cables, which comprises the following components in parts by mass: 100 parts by mass of vinyl polydimethylsiloxane, 2.5 parts by mass of high vinyl silicone oil, and 0.1 parts by mass of crosslinking agent 10 parts by mass of anti-aging additives, 35 parts by mass of fumed silica, 0.1 parts by mass of phenyl silicone oil with high phenyl content, 0.5 parts by mass of aminobenzotriazole or its derivatives, 0.025 parts by mass of platinum catalyst , 0.001 parts by mass of inhibitor.

[0057] In this embodiment, the vinyl polydimethylsiloxane is a polydimethylsiloxane containing vinyl units in its molecule or a mixture of polydimethylsiloxanes with different viscosities. The polydimethylsiloxane has a viscosity of 10,000-150,000 mpas at 25° C., and a vinyl content of 0.1-0.3%. The crosslinking agent is an organopolysiloxane containing at least two Si-H bonds or a mixture of silanes with diffe...

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Abstract

The invention discloses a liquid silicone rubber composition for a cold shrink cable and a preparation method of the liquid silicone rubber composition. The composition is prepared from, in parts by mass, 100 parts of vinyl polydimethylsiloxane, 0.5-5 parts of high vinyl silicone oil, 0.1-10 parts of a cross-linking agent, 0.01-10 parts of an anti-aging assistant, 20-50 parts of fumed silica, 0.1-2 parts of phenyl silicone oil with high phenyl content, 0.001-0.5 part of aminobenzotriazole or a derivative of aminobenzotriazole, 0.001-0.5 part of a platinum catalyst and 0.001-0.5 part of an inhibitor, and the preparation method includes the steps of: preparing base glue, preparing A glue and B glue, mixing the A glue and the B glue and the like. According to the liquid silicone rubber composition for the cold shrink cable and the preparation method of the liquid silicone rubber composition, the liquid silicone rubber composition for the cold shrink cable has the advantages of excellent ablation resistance, good tracking resistance and excellent physical properties.

Description

technical field [0001] The invention relates to the technical field of liquid silicone rubber compositions, in particular to a liquid silicone rubber composition for cold-shrinkable cables and a preparation method thereof. Background technique [0002] In the early 1970s, 3M Company of the United States invented cold shrinkage technology, and at the same time applied this technology to cross-linked power cable accessories in places where open flames cannot be used (mining, chemical industry), which opened a new era for the application of cold shrinkable cable accessories; Cable accessories refer to the intermediate connection and terminal joints of various cables in the cable line, which together with the cables constitute the transmission network; cold-shrinkable cable accessories are rubber parts with internal supports (including joint sleeves, terminals, etc.) Sleeve and branch sleeve, etc.) are placed on the treated cable, and the support is pulled out to make it shrink ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K13/06C08K9/06C08K3/36C08K5/3475C08K3/22
CPCC08L83/04C08K2003/2213C08K2003/2241C08K2003/2275C08K2201/006C08L2201/08C08L2203/20C08L2205/025C08L2205/035C08K13/06C08K9/06C08K3/36C08K5/3475C08K3/22
Inventor 许二建邓圣志冯文海王华潘汉新贾飞
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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