Flexible silicone thermal conductive composition and preparation method thereof

Abstract

A flexible silicone thermal conductive composition includes a core thermal conductive composition, an insulating layer, and an isolating layer, from inside to outside. The core thermal conductive composition includes the following components by mass fraction: silicone base polymer 5-30%, silicone crosslinking agent 0.2-5%, silicone chain extender 1-8%, thermal conductive filler 60-93%, powder dispersant 0.1-1.2%, catalyst 0.02-0.2%, retarder 0.02-0.1%, and toughening agent 0.5-6%. The insulating layer includes the following components by mass fraction: silicone base polymer 85-95%, silicone crosslinking agent 0.2-8%, silicone chain extender 1-10%, dehydrating agent 0.1-0.5%, catalyst 0.05-0.15%, retarder 0.02-0.1%, and toughening agent 0.4-15%. The isolating layer includes the following components by mass fraction: metal oxide 95-99%, and powder dispersant 1-5%. The flexible silicone thermal conductive composition as thermal conductive gap filling materials in the range of 1-8 W/mk has ultra-high electrical insulation performance, wider gap filling range, and an extremely low oil bleeding rate.

Dependencies are inferred from the claim text.