Accelerated Acid-Water Aging of RTV Silicone Rubber Coatings

Abstract

The paper reports on tests done on four commercial room-temperature vulcanized (RTV) silicone rubber high voltage insulator coatings aimed at achieving information on the relative performance of the coatings and the effect of acid-water on the surface degradation. The initial characterization of the coatings includes the identification of the primary filler type, concentration of filler, the amount of free fluid, and the molecular make-up of the free fluid. Soxhlet extraction and gas chromatography tests show considerable depletion of fluid after accelerated aging tests in acidwater and the associated depolymerization on the properties is assessed by changes in hardness. The effect of acid-water aging on the hydrophobicity is assessed by measurements of the static contact angle. The relative comparison of LMW of acid-water aged to field aged coatings gives an idea of the aging process in the field.

Comparison of EPDM/SIR insulation performance and mechanism analysis of the distribution cable accessories under moisture condition

“…Kemaloglu et al researched the effect of different llers on the thermal property of SIR [8]. Jahromi et al reported the effect of surface degradation of silicone rubber for the high voltage insulator coating [9]. KAMIYA et al declared the effect of secondary crosslinking reaction on the initial voltage of the electrical branch in SIR dielectric and found that the tree voltage of SIR increases after the degassing process and it decreases after the process of reaeration [10].…”