Heat dissipating complex composition with high thermal conductivity complex heat dissipating film with high thermal conductivity prepared from the same composition preparing method for the same film and electronic device encapsulant including the same film as heat dissipating solution

A complex heat dissipation sheet is provided. The complex heat dissipation sheet according to an embodiment of the present invention has excellent thermal conductivity in both vertical and planar directions, and is easy to manufacture in large areas and with a thin thickness, can reduce brittleness and has excellent flame retardancy, thereby being suitable for application in high-temperature environments, especially in fields that require large-area heat dissipation films, such as battery cases for electric vehicles. 복합 방열 시트가 제공된다. 본 발명의 일 실시예에 따른 복합 방열 시트는 우수한 수직 및 면상 방향으로의 열 전도도가 모두 우수하며, 대면적 제조 및 얇은 두께로 제조가 용이하며, 취성을 감소시킬 수 있고 난연성이 우수하므로 고열 환경 특히 전기 자동차의 배터리 케이스와 같은 대면적의 방열 필름을 요구하는 분야에 적용하기 적합한 특성을 갖는다.