Heat-dissipating plastic

A heat-dissipating plastic, comprising:

• a polymer matrix comprising a main resin;
• and
• a carbon-based filler which is dispersed in the polymer matrix, and comprises a fibrous carbon-based filler and a granular carbon-based filler, wherein the fibrous carbon-based filler is an anisotropic pitch-based carbon fiber, and the carbon-based filler comprises the fibrous carbon-based filler and the granular carbon-based filler at a weight ratio of 1:1 to 5,
• wherein the heat-dissipating plastic comprises 20 to 60 parts by weight parts by weight of the carbon-based filler based on 100 parts by weight of the main resin,
• wherein the anisotropic pitch-based carbon fiber has an average fiber diameter of 6 to 18 μm and an average fiber length of 5 to 10 mm,
• wherein the granular carbon-based filler has an average particle diameter of 10 to 300 μm,
• wherein an average fiber diameter of the anisotropic pitch-based carbon fiber and an average particle diameter of the granular carbon-based filler have a diameter ratio of 1:0.5 to 60, and
• wherein the granular carbon-based filler comprises a graphite composite, the graphite composite comprises graphite, nanoparticles bonded to a surface of the graphite and a catecholamine layer, and the nanoparticles are Cu, Ni or Si.