Preparation of high-performance foamed conductive silicone rubber

Abstract

"Foamed conductive silicone rubber was prepared by dehydrogenation foaming method using coupling agent, conductive powder filler and Pt catalyst with vinyl silicone oil and hydroxyl silicone oil as matrix and silicone oil containing hydrogen as cross-linking agent, and the synchronization of foa-ming and cross-linking, conductivity and mechanical properties of foamed conductive silicone rubbers were characterized by rubber processing analyzer, scanning electron microscope, broadband dielectric impedance spectrometer, and electronic universal testing machine, respectively. Furthermore, the effect of foaming and cross-linking temperature, addition amount of cross-linking agent and addition amount of conductive powder filler on the properties of foaming conductive silicone rubbers were investigated. The results showed that when the foaming and cross-lin-king temperature was 115 ℃, the synchronization of foaming and cross-linking was the best and the foaming silicone rubber prepared had a uniform cell structure and the optimum mechanical properties. When the addition amount of cross-linking agent was 0.45 phr (mass, similarly hereinafter), apparent density of foamed conductive silicone rubber was 0.69 g/cm3 and compressive strength was 1.17 kPa, which indicated the addition amount of cross-linking agent was the optimal at this time. When the addition amount of conductive powder filler was 10 phr, conductivity of foamed conductive silicone rubber could be up to 1.5 S/cm, which demonstrated the electrical conductivity of foamed conductive silicone rubber was very excellent. "

Keywords

• silicone rubber
• foaming modification
• conductive powder filler
• compression set rate
• compressive strength
• conductivity