| 摘要 |
PROBLEM TO BE SOLVED: To provide a painting technique for lowering equipment metal housing surface temperature applicable to mounting technique of portable electronic appliances such as note-size personal computers and mobile phone sets. SOLUTION: The method aims to effectively radiate the intensive heat generated by CPUs by dispersing the heat through the entire housing made of a light metal and the paint layer containing hollow elements. More concretely, using a paint containing hollow elements having buoyancy in the paint and particle size less than 1/4 of the paint film thickness in an amount of 2 to 15 wt.% based on the non-volatile part in the paint, the viscosity of the paint is so adjusted, with skin layer formation in view, that the hollow elements will increase in concentration from the base surface toward the paint film surface. The method produces a heat conduction inhibiting paint film having a flat surface and a heat conductivity gradient wherein heat conductivity is the minimum in the surface layer.
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