Silicon rubber sealing mortar used for middle-high voltage cable accessory and cable accessory

A medium and high voltage cable and silicone rubber technology, applied in the power field, can solve the problems of difficulty in effectively protecting cable joints, decreased mechanical strength, poor weather resistance of cable accessories, etc.

Active Publication Date: 2013-10-23
TYCO ELECTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cable accessories installed in the latter way have poor weather resistance. After long-term storage and use, the mechanical strength of the rubber body of the cold shrinkable sleeve will decrease, and it will be easily broken, making it difficult to effectively protect the cable joint.

Method used

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  • Silicon rubber sealing mortar used for middle-high voltage cable accessory and cable accessory

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The number average molecular weight is selected to be about 600,000 g / mol, the kinematic viscosity is selected to be about 10,000 cst, polydimethylsiloxane is used as the second siloxane polymer, and fumed white carbon black and aluminum hydroxide powder are selected as fillers.

[0056] Add 100 parts of the first siloxane polymer to an internal mixer at 150 degrees Celsius and knead, and add 220 parts of 600-mesh aluminum hydroxide powder and 20 parts of fumed silica, and 2 parts of the second siloxane polymer thing, and kneading for 1 hour, cooling out of the sheet. Afterwards, the strip-shaped sealing compound is extruded through a twin-roll mill, calender or extruder. The strip-shaped sealing glue can be further cut into a size suitable for the matching rubber body and support tube of the cable accessory.

[0057] Based on the GB / T 12828-2006 standard, the plasticity value of the sealing putty obtained by the above method was tested, and the measured plasticity val...

Embodiment 2

[0061] The number average molecular weight is selected to be about 600,000 g / mol, the kinematic viscosity is selected to be 10,000 cst, and fumed silica and aluminum hydroxide powder are selected as fillers.

[0062] Add 100 parts of the first siloxane polymer to an internal mixer at 150 degrees Celsius and knead, and add 220 parts of 600-mesh aluminum hydroxide powder and 15 parts of fumed silica, and 2 parts of the second siloxane polymer thing, and kneading for 1 hour, cooling out of the sheet. Afterwards, the strip-shaped sealing compound is extruded through a twin-roll mill, calender or extruder. The strip-shaped sealing glue can be further cut into a size suitable for the matching rubber body and support tube of the cable accessory.

[0063] Based on the GB / T 12828-2006 standard, the plasticity value of the sealing putty obtained by the above method was tested, and the measured plasticity value of the sealing putty was 400.

[0064] Further, the sealing glue, the suppo...

Embodiment 3

[0067] The number average molecular weight is selected to be about 400,000 g / mol, the kinematic viscosity is selected to be 10,000 cst, and fumed silica is selected as the filler.

[0068] Add 125 parts of the first siloxane polymer to a mixer at 150 degrees Celsius and knead, add 25 parts of fumed silica, and 5 parts of the second siloxane polymer, knead for 2 hours, and cool out piece. Afterwards, the strip-shaped sealing compound is extruded through a twin-roll mill, calender or extruder. The strip-shaped sealing glue can be further cut into a size suitable for the matching rubber body and support tube of the cable accessory.

[0069] The sealing glue, the support tube and the rubber body are assembled into a cable accessory, and an aging test is performed on the cable accessory. After the aging test, pull out the support tube in the cable accessory, visually observe the outer surface of the rubber body of the cable accessory, and find no oily droplets or similar liquid s...

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Abstract

The present invention relates to silicone rubber sealing glue used in medium and high voltage cable accessories and its preparation method and cable accessories. The sealing glue contains a) a first siloxane polymer containing a repeating unit represented by Formula (I): RaSiO(4-a) / 2, wherein group R is a substituted or unsubstituted group containing 1 to 20 carbon atoms, a is 0, 1, 2 or 3, wherein number-average molecular weight of the first siloxane polymer is from 150000 to 900000 g / mol; b) a second siloxane polymer containing a unit represented by Formula (I), wherein kinematic viscosity of the second siloxane polymer is from 5000 cst to 100Mcst; and c) filler; wherein the filler accounts for more than 10% of the sealing glue in weight. Compared with prior arts, the second siloxane polymer molecule used in the sealing glue of the present invention is relatively big and the second siloxane polymer is difficult to penetrate into rubber body. Therefore, performance of the rubber body is not easily affected by the sealing glue, which can prolong life of the rubber body and stabilize quality of protection for cable headend.

Description

technical field [0001] The invention relates to the field of electric power technology, and more specifically, relates to a silicone rubber sealing putty for medium and high voltage cable accessories and cable accessories. Background technique [0002] Cable terminals and intermediate joints are important components in power transmission and transformation cable lines. The connection quality between the cable joints directly affects the reliability of the power transmission and transformation cable lines, which in turn corresponds to the safety and operation stability of the entire power transmission and transformation lines. [0003] Various methods are adopted in the prior art to realize the protection of the cable connection. For example, Chinese patent ZL85109479.1 provides a cable sealant used in conjunction with a cold shrink sleeve to form a cable accessory for protecting cable joints. Cable sealants and shrink sleeves can be used in two ways. One way is to wrap th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/08C09K3/10H02G15/00
CPCC09J183/04C08L83/00C08K3/013
Inventor 李玉刚李鹏杨立章
Owner TYCO ELECTRONICS (SHANGHAI) CO LTD
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