Influence of vulcanization factors on UV-A resistance of silicone rubber for outdoor insulators

High temperature vulcanized silicone rubber (HTVSR) used outdoors is often deteriorated by ultraviolet (UV)-A radiation. UV-A resistance of HTVSR is related to network structures affected by vulcanization conditions (temperature, time, and pressure). To improve the UV-A resistance of HTVSR, an ortho...

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Vydané v:IEEE transactions on dielectrics and electrical insulation Ročník 27; číslo 1; s. 296 - 304
Hlavní autori: Lin, Ying, Yin, Fanghui, Liu, Yuhao, Wang, Liming, Wu, Kangning
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York IEEE 01.02.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Aging
Crosslinking
Electrical properties
Fillers
Fourier transforms
Free radicals
High temperature
high temperature vulcanized silicone rubber
Immune system
Insulators
mechanical and electrical properties
Mechanical factors
Mechanical properties
Radiation tolerance
Resistance
Resistance factors
Rubber
Silicone rubber
Statistical analysis
Statistical methods
Temperature
ultraviolet-A resistance
Vulcanization
vulcanization conditions
ISSN:1070-9878, 1558-4135
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Shrnutí:High temperature vulcanized silicone rubber (HTVSR) used outdoors is often deteriorated by ultraviolet (UV)-A radiation. UV-A resistance of HTVSR is related to network structures affected by vulcanization conditions (temperature, time, and pressure). To improve the UV-A resistance of HTVSR, an orthogonal experiment about vulcanization conditions was established. Mechanical properties, electrical properties, crosslink density, and Fourier transform infrared spectroscopy (FTIR) of a total of 747 HTVSR samples were measured during the UV-A aging process. Based on the change rates of the above properties, a comprehensive change degree index was proposed to assess the UV-A resistance. It was found that HTVSR vulcanized at 170°C, for 15 min, and under 12 MPa was endowed with excellent UV-A resistance due to the high crosslink degree, low content of -OH groups, and evenly dispersed fillers. They decreased the diffusion of oxygen and free radicals generated during the UV-A aging, the activity of silicone rubber to UV-A radiation, and the surface area of silicone rubber exposed to UV-A radiation. This statistical analysis result was verified by comparing HTVSR vulcanized under this condition with that vulcanized under other conditions in practice. This paper provides a potential approach to optimize UV-A resistance of HTVSR at the initial fabrication process.
Bibliografia:ObjectType-Article-1
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ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2019.008483