Effect and mechanism of ureido-modified MQ silicone resin and platinum on tracking and erosion resistance of silicone rubber

How to effectively enhance the tracking and erosion resistance of silicone rubber is a significant topic in high-voltage insulation. In this work, ureido-modified MQ silicone resin (UHMQ) was synthesized and employed to improve tracking and erosion resistance of silicone rubber in combination with p...

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Vydáno v:Polymer testing Ročník 70; s. 162 - 169
Hlavní autoři: Chen, Wanjuan, Zeng, Xingrong, Lai, Xuejun, Li, Hongqiang, Pan, Zhijie
Médium: Journal Article
Jazyk:angličtina
Vydáno: Barking Elsevier Ltd 01.09.2018
Elsevier BV
Témata:
Ablation
Chains
Corrosion resistance
Crosslinking
Cyclic oligomers
Discharge
Electric arcs
Erosion mechanisms
Erosion resistance
Fourier transforms
High voltages
High-temperature vulcanized silicone rubber
Inclined plane test
Insulation
Leakage current
Oligomers
Oxidation
Platinum
Pyrolysis
Scanning electron microscopy
Silicone resins
Silicone rubber
Silicones
Surface stability
TG-FTIR
Thermal stability
Thermogravimetric analysis
Thermogravimetry
Tracking
Tracking and erosion resistance
Ureido-modified MQ silicone resin
High-temperature vulcanized silicone rubber
Ureido-modified MQ silicone resin
Platinum
Tracking and erosion resistance
Inclined plane test
TG-FTIR
ISSN:0142-9418, 1873-2348
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Shrnutí:How to effectively enhance the tracking and erosion resistance of silicone rubber is a significant topic in high-voltage insulation. In this work, ureido-modified MQ silicone resin (UHMQ) was synthesized and employed to improve tracking and erosion resistance of silicone rubber in combination with platinum (Pt). The effect and mechanism of UHMQ/Pt on tracking and erosion resistance were studied via inclined plane test, leakage current curves, scanning electron microscopy, thermogravimetry and thermogravimetry-Fourier transform infrared spectrometry. When 5–7 phr of UHMQ and 0.33 phr of Pt catalyst were added, the tracking and erosion resistance of silicone rubber were greatly improved. In this case, all specimens passed the inclined plane test at 4.5 kV with low eroded mass and undamaged surfaces. The thermal stability of silicone rubber containing UHMQ/Pt was also much higher than that without, and the leakage current and discharging frequency on the surface of silicone rubber were markedly decreased with the introduction of UHMQ/Pt. This was attributed to UHMQ/Pt catalyzing radical crosslinking of silicone chains under arc discharging so that a protective barrier was established on the surface to resist arc ablation. Also, the enhanced radical mechanism suppressed degradation of silicone chains, and thus reduced release of cyclic oligomers which would aggravate arc discharging. Furthermore, since UHMQ/Pt facilitated complete oxidation of pyrolysis gases, the carbon deposit was reduced and tracking was suppressed. •Ureido-modified MQ silicone resin (UHMQ) and platinum (Pt) were introduced into silicone rubber.•UHMQ/Pt could significantly improve the thermal stability and tracking and erosion resistance of silicone rubber.•UHMQ/Pt reduced average leakage current and discharging frequency on the surface of silicone rubber.•The TG-FTIR of evolved gases during heating was performed.•The possible suppression mechanism of UHMQ/Pt on tracking and erosion of silicone rubber was proposed.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.07.001