Heat dissipation composition, and electrical insulation-heat dissipation body and heat dissipation structure comprising heat dissipation composition

Abstract

A two-part, gap-filling silicone thermal interface material is disclosed. The main and curing agents each contain vinyl-terminated and hydrogen-terminated silicone resins blended with flame-retardant fillers and lightweight hollow particles. Keeping the hollow filler at 5-10 parts by weight and controlling the 1 rpm viscosity of each part to 2.5×105 cP to 7.0×105 cP (thixotropy 2.5-4.0) produces a paste that stores for 30 days without oil bleed, then dispenses smoothly through a 2 mm nozzle. After curing 24 h at 25° C., the material forms an electrically insulating body with >=3 Wm−1K−1 thermal conductivity, Shore 00 hardness 52-56, and apparent density <=1.9 g cm−3. Conductivity remains within 95% of its initial value after ageing 24 h at 100° C. The cured body serves as a lightweight, flame-retardant gap filler between battery cells or other heat sources and adjacent components, lowering interface resistance while maintaining long-term mechanical and thermal stability.

Dependencies are inferred from the claim text.