ELECTROSTATIC COATING METHOD FOR FUNCTIONAL COATING FILM, AND BUILDING MATERIAL FORMED WITH FUNCTIONAL COATING FILM OF POWDER COATING

PROBLEM TO BE SOLVED: To provide a coating method that simply and definitely forms a functional coating of high weatherability by electrostatic coating. SOLUTION: A polyester powder coating material and a fluoric powder coating material are dry-blended with a mixing ratio of 7:3, and after they are electrostatically coated onto a coating object, atmosphere heating is performed on the coating object. It appears that because the powder coating material is indefinite form, voids are formed between the powder coating materials in the electrostatically-coated powder coating material layer; the polyester powder coating material of low melting temperature is melted in advance by atmosphere heating; the fluoric powder coating material of a high melting temperature is subsequently melted while allowing the polyester powder coating material of a low melting temperature to pass through the voids in the coating material powder layer to form a base coating film in the lower layer; and a functionality exerting film for securing weatherability is formed so as to be loaded on a base coating. The functional coating where fluorine consumption is decreased may be obtained by making use of time-gap melting of coating material with both the hot blending and temperature raising of the coating object to dispose the fluoric coating on the surface without performing a uniform distribution in the coating. COPYRIGHT: (C)2011,JPO&INPIT