Loading [a11y]/accessibility-menu.js
Simultaneous Improvement of Surface Properties of the Liquid Silicone Rubber by Direct Fluorination | IEEE Conference Publication | IEEE Xplore

Simultaneous Improvement of Surface Properties of the Liquid Silicone Rubber by Direct Fluorination

Publisher: IEEE

Abstract:

In this report, liquid silicone rubber (LSR) was fluorinated and studied. ATR-IR and XPS results clearly indicate the presence of Si-F bonds as well as C-F bonds in the f...View more

Abstract:

In this report, liquid silicone rubber (LSR) was fluorinated and studied. ATR-IR and XPS results clearly indicate the presence of Si-F bonds as well as C-F bonds in the fluorinated layer. The fluorination of the LSR is not a simple substitution of fluorine atoms for hydrogen atoms of methyl groups or for methyl groups, and during the fluorination besides fluorine atoms there are other reactive species, such as methyl derivatives and their fluorides, which would be also attached to Si or graft to methyl groups via hydrogen replacement. The experimental results show that the fluorinated surface is highly hydrophobic and partially conductive. The flashover tests using a sheet sample/finger electrode arrangement found a more than 60% increase in DC flashover voltage of the LSR material by the fluorination. The simultaneous improvement of surface properties is meaningful for outdoor insulation applications of the material.
Date of Conference: 05-31 July 2020
Date Added to IEEE Xplore: 04 February 2021
ISBN Information:
Publisher: IEEE
Conference Location: Valencia, Spain

Funding Agency:


I. Introduction

Because of excellent insulation and mechanical properties, silicone rubber (SR) has become a common insulating material in high voltage electrical equipment. The high hydrophobicity and unique hydrophobic recovery of SR prevent the formation of a water film on its surface, thereby reducing the occurrence of pollution flashover. HVDC transmission has been widely used in the long-distance transmission of electric energy and access to new energy because of its advantages, such as low loss, large transmission capacity, and easy realization of grid interconnection. However, HVDC systems have to meet many challenges and problems at present, compared with HVAC systems. In the outdoor environment, electrostatic adsorption is more likely to occur under DC high voltage, which makes it easier for pollutants in the air to be deposited on the surface of the insulator, so flashover is more likely to occur. The accumulated charge on the surface of the insulator will lead to the distortion of the surface electric field and reduce the flashover voltage, which is affected by the polarity and distribution of the accumulated charge [1].

References

References is not available for this document.