| 摘要 |
PROBLEM TO BE SOLVED: To enable a uniform coating film to be formed on an object having a nonplane surface by spraying a powder coating material contg. a specific film-forming resin powder and an antistatic agent to an object having a nonplane surface with a power spray gun. SOLUTION: A film-forming resin comprising a thermosetting resin (e.g. an epoxy resin, an epoxy-polyester resin, or a polyester resin), having a vol. average particle size of 3-30μm, and contg. 5wt.% or lower powder having particle size of 1/5 of the vol. average particle size or lower is subjected to corona discharge treatment to give a powder which has a permittivity of 2.0-6.0 and exhibits, under a voltage of 100V, a vol. resistivity of 1×10<14>Ω.cm and a static charge of -0.5 to -3.0μC/g. This powder is compounded with a curative and 0.03-1.0wt.% antistatic agent to give a power coating material. The coating material is spray applied to an object having a nonplane surface placed 100-300mm apart from the gun tip of a powder spray gun at a delivery rate of 50-300g/min.
|
