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Tracking-resistant addition type liquid silicone rubber composition and preparation method and application thereof

A liquid silicone rubber, tracking resistance technology, applied in the field of high-voltage and ultra-high electrical insulation of silicone rubber, can solve the problems of low fluorosilane content, reduced crosslinking density of silicone rubber, and reduced tracking resistance of silicone rubber, etc. Achieve good water resistance, good stability, and improve the effect of tracking resistance

Active Publication Date: 2021-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But F-SiO 2 It cannot stably improve the tracking resistance of addition-type liquid silicone rubber, only in F-SiO 2 When the amount is 1.0 parts by mass (the amount of vinyl silicone oil is 100 parts by mass), the addition-type liquid silicone rubber sample can reach the 1A4.5 grade, the possible reason is that the F-SiO 2 When the amount is less than 1.0 parts by mass, F-SiO 2 Although the fluorosilane in the structure can play the role of charge dissipation, the content of fluorosilane is low, and the rate of dissipating charge cannot keep up with the rate of charge injection into the silicone rubber during arc discharge, and the charge gradually accumulates into the silicone rubber, resulting in silicone rubber Molecular chains are broken
In F-SiO

Method used

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  • Tracking-resistant addition type liquid silicone rubber composition and preparation method and application thereof
  • Tracking-resistant addition type liquid silicone rubber composition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 10.00g of silicon dioxide to a three-necked flask filled with 296.00g of absolute ethanol, and ultrasonically stir for 2h to obtain a dispersion; .Effect of alkyl-dissubstituted ureido silanes with different alkyl chain structures ontracking resistance property of addition-cure liquid silicone rubber, Polym. Degrad. Stabil. 142 (2017) 263-272.) Preparation of isopropyl disubstituted ureido siloxane Add 41.00g of ammonia water to the dispersion, heat up to 70°C, react for 4 hours, centrifuge the obtained reaction solution, rinse the obtained solid with 30.00g of absolute ethanol, then perform centrifugation, and repeat the separation Operate 3 times, finally, solid matter is dried, obtains powdery product silicon dioxide grafted isopropyl group disubstituted ureido siloxane (DIPUPES-SiO 2 ).

[0037] In terms of parts by mass, mix 100 parts of vinyl silicone oil, 40 parts of white carbon black and 6.8 parts of hexamethyldisilazane in a vacuum kneader, knead at 30°C ...

Embodiment 2

[0039] The difference between embodiment 2 and embodiment 1 is that DIPUPES-SiO 2 The addition amount is 1.0 parts.

Embodiment 3

[0040] The difference between embodiment 3 and embodiment 1 is that DIPUPES-SiO 2 The addition amount of is 1.5 parts.

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Abstract

The invention discloses a tracking-resistant addition type liquid silicone rubber composition and a preparation method and application thereof. The tracking-resistant addition type liquid silicone rubber composition is prepared from the following raw materials in parts by mass: 100 parts of vinyl silicone oil, 30 to 50 parts of white carbon black, 5 to 8 parts of hexamethyldisilazane, 1.0 to 3.0 parts of hydrogen-containing silicone oil, 1.0 to 3.0 parts of silicon dioxide grafted ureido siloxane, 0.04 to 0.08 part of 1acetenyl 1cyclohexanol and 10 to 25ppm of platinum catalyst. The silicone rubber composition disclosed by the invention has excellent tracking resistance and water resistance, the addition type liquid silicone rubber composition can still reach the 1A4.5 grade after being soaked in water for 5 days, the electrical erosion loss rate is basically unchanged, and the silicone rubber composition can be applied to outdoor insulation of high-voltage and ultrahigh-voltage powertransmission.

Description

technical field [0001] The invention relates to a liquid silicone rubber composition, in particular to a tracking-resistant additive liquid silicone rubber composition and a preparation method and application thereof; belonging to the field of high-voltage and ultra-high-voltage electrical insulation of silicone rubber. Background technique [0002] Addition-type liquid silicone rubber will suffer from tracking damage in outdoor insulation applications, especially in high-voltage and ultra-high-voltage power transmission. During the tracking process, the arc discharge causes the silicone rubber molecular chain to degrade and carbonize to form a conductive path, which eventually makes the insulation of the silicone rubber fail, causes a short circuit, paralyzes the transmission and transformation grid, and causes very large economic losses. [0003] In order to improve the tracking resistance of addition-type liquid silicone rubber, it is usually modified by adding a large am...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K9/06C08K3/36C08K7/26C08K5/544
CPCC08L83/04C08L2205/025C08K13/06C08K9/06C08K3/36C08K7/26C08K5/544
Inventor 曾幸荣谢炽新赖学军李红强
Owner SOUTH CHINA UNIV OF TECH
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