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Study on effect of hydrophobic coating on surface charge accumulation characteristics of silicone rubber
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Tian NAN1, Jie LIANG1, Zhiyuan LIU1, Mingxiang YANG1, Kezu WANG1, Dexiong HU2, Lu GUO3, Feng WANG2
Insulating Materials | 2025, 58(7) : 26 - 33
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Insulating Materials | 2025, 58(7): 26-33
• Special Issue on Electrical Equipment Interface Insulation •
Study on effect of hydrophobic coating on surface charge accumulation characteristics of silicone rubber
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Tian NAN1, Jie LIANG1, Zhiyuan LIU1, Mingxiang YANG1, Kezu WANG1, Dexiong HU2, Lu GUO3, Feng WANG2
Affiliations
  • 1. Material Business Department, State Grid Gansu Electric Power Company, Lanzhou 730050, China
  • 2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
  • 3. State Grid Gansu Electric Power Company Electric Power Science Research Institute, Lanzhou 730050, China
Published: 2025-07-20 doi: 10.16790/j.cnki.1009-9239.im.2025.07.003
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To investigate the effects of hydrophobic coatings on charge accumulation characteristics of silicone rubber, this study prepared hydrophobic coatings with hydrophobic fumed silica (SiO2) particles as fillers. The surface charge distribution on silicone rubber surface coated with hydrophobic coatings containing different amounts of SiO2 particles was measured under both positive and negative DC corona using an electrostatic capacitance probe. Additionally, the surface micromorphology, static contact angle, surface resistivity, and DC creepage flashover voltage of silicone rubber surface coated with hydrophobic coatings containing different amounts of SiO2 were characterized. The results show that the static contact angle of silicone rubber surfaces increases with the increase of SiO2 content in the hydrophobic coating. However, applying hydrophobic coatings on silicone rubber will exacerbate the surface charge accumulation. When the mass fractions of SiO2 is 2%, 6%, and 10%, the maximum surface charge density accumulated on silicone rubber surface increases by 5.03%, 20.11%, and 24.06%, respectively, which will also decrease the surface resistivity and DC creepage flashover voltage of silicone rubber. Analysis suggests that the hydrophobic coating surface will generate more gaps and holes, thereby facilitating the capture and adsorption of charges, making it difficult for the charges to dissipate.

silicone rubber  /  hydrophobic coating  /  surface charge  /  accumulation characteristic  /  surface flashover
Tian NAN, Jie LIANG, Zhiyuan LIU, Mingxiang YANG, Kezu WANG, Dexiong HU, Lu GUO, Feng WANG. Study on effect of hydrophobic coating on surface charge accumulation characteristics of silicone rubber[J]. Insulating Materials, 2025 , 58 (7) : 26 -33 . DOI: 10.16790/j.cnki.1009-9239.im.2025.07.003
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2025.07.003
  • Receive Date：2024-11-12
  • Online Date：2025-10-29
  • Published：2025-07-20
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History
  • Received：2024-11-12
  • Revised：2025-01-10
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Affiliations
    1. Material Business Department, State Grid Gansu Electric Power Company, Lanzhou 730050, China
    2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
    3. State Grid Gansu Electric Power Company Electric Power Science Research Institute, Lanzhou 730050, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2025.07.003
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