Effective improvement of anti-tracking of addition-cure liquid silicone rubber via charge dissipation of fluorosilane-grafted silica. (September 2019)

• Record Type: Journal Article
• Authors: Xie, Chixin; Lai, Xuejun; Li, Hongqiang; Zeng, Xingrong
• Is Part Of: Polymer degradation and stability. Volume 167(2019)
• Page Start: 250
• Page End: 258
• Publication Date: 2019-09
• Subjects: Addition-cure liquid silicone rubber -- Anti-tracking -- Fluorosilane-grafted silica -- Charge dissipation; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2019.06.014
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: Improving the anti-fouling and anti-tracking of silicone rubber (SR) is significant to enlarge its application in the field of outdoor high voltage insulation. In this work, fluorosilane-grafted silica (F–SiO2 ) was prepared by the grafting reaction of silica with perfluorooctyltriethoxysilane. Inclined-plane test (IP test), surface potential decay test, plasma irradiation, XPS and SEM were applied to study the effect of F–SiO2 on the anti-tracking of addition-cure liquid silicone rubber (ALSR). The results demonstrated that F–SiO2 postponed the occurrence of intensive arc discharge and reduced arc discharge on ALSR surface. The anti-plasma irradiation and anti-tracking of ALSR were remarkably enhanced. When F–SiO2 content was 1 phr, ALSR/F–SiO2 passed the 1A4.5 kV IP test and the erosion mass was only 0.22 wt%. Moreover, the mechanical properties and hydrophobicity of ALSR were improved. Surface potential decay test showed that F–SiO2 could dissipate charges. Combining its excellent anti-plasma irradiation, it was revealed that F–SiO2 dissipated the injected charges and diminished the density of charges in ALSR during the arc discharge, which reduced the damage of charges to ALSR chains and suppressed the arc discharge. Therefore, the anti-tracking of ALSR was enhanced. Highlights: F–SiO2 could effectively enhance the tracking and erosion resistance of ALSR. ALSR contained 1 phr F–SiO2 passed 1A4.5 level and the eroded mass was only 0.22 wt%. F–SiO2 could dissipate charges and improve the anti-plasma irradiation of ALSR. The suppression mechanism of F–SiO2 on the tracking of ALSR was explored.