Effect of resin types and graphites in coating films on heat radiating properties of pre-coated aluminum sheet

In recent years, as electronic equipments become more compact and have higher performance, the problem of heat is being aggravated. As a way to solve this problem, pre-coated aluminum sheet has been noticed. It is known that black additives-containing coating film has the relatively good thermal radiation. However, the detailed reports on the effects of resin types and black additives in coating films are few. Therefore, we studied in detail the effects of resin types and graphites in coating films on heat radiating properties of pre-coated aluminum sheet. In this paper, we consider that the chemical structure of the resin in coating films is closely related with the spectral emissivity. Especially emissivity of polyester cured by melamine is good. It is possible for graphite to improve the emissivity of the wide wavelength range 4.5~14.2 μm, It was found that the average particle size 7.0 μm of amorphous graphite is effective especially.