Thermally conductive and emissive heat resistant graphene composite coating and its application method

摘要

The present invention relates to a heat resistant coating agent mixed with graphene having the thermal conductivity and heat radiation properties, and a coating method thereof. The present invention provides a heat resistant coating agent mixed with grapehene having the thermal conductivity and high heat radiation properties, which comprises a coating layer coated on the surface of a material, and having graphene with a particle size of 5-100 nm in a double-layered structure, and graphite particles with a particle size of 3-10 m mixed at a weight ratio of 1:2-8; and a coating protective film formed on the surface of the coating layer and made of the polydimethylsiloxane resin with insulation properties, and a coating method thereof. The coating layer is formed by dispersing a mixture, in which 30-90 parts by weight of a mixture of graphene and graphite and 2-10 parts by weight of a silicone dispersion agent are mixed with 1000 parts by weight of a solvent, with an ultrasound, and coating on the surface of a material in the electrostatic method, and the solvent is composed of a mixed solvent of dimethylformamide (DMF), ethyl alcohol (EtOH) and methyl-pyrrolidine (NMP (N-Methyl-2-pyrrolidone)). According to the present invention, the coating agent is able to be used as a heat resistant coating agent with the thermal conductivity and high heat radiation properties for high performance micro devices by using a graphene mixture which achieves an excellent heat radiation effect at a low cost. [Reference numerals] (AA) Material surface treatment (Degreasing, foreign substance removal); (BB) Material pre-heating (200-250C); (CC) High heat proof/high heat radiation coating agent coating (electrostatic painting method); (DD) PDMS protective coating (electrostatic painting method); (EE) Plasticizing (200-250C)x(1-4 hours); (FF) End