ELECTRODEPOSITION PAINTING METHOD

Title:

ELECTRODEPOSITION PAINTING METHOD

Document Type and Number:

Japanese Patent JPS5669394

Kind Code:

A

Abstract:

PURPOSE:To uniformly disperse the replenished paint, at the time of electrodeposition painting by the disphragmatic process by treating the electrodeposition paint by the filtration membrane which permeates water but does not permeate resin component and taking a part of filtrate in the diaphragm room and then, using a part of diaphragm liquid as dilution liquid of the replenishing paint. CONSTITUTION:Electrodeposition paint in an electrodeposition bath 1 is treated by a filtration membrane 4 at the time of carrying out electrodeposition painting of the material to be painted in the bath 1 having the diaphragm room which is provided with an electrode 3. Ultrafiltration membrane, or reverse osmotic membrane such as anion exchange membrane for cation electrodeposition, and cation electrodeposition membrane for anion electrodeposition, which permeates water and permeates hardly resin component, is used. Concentrated liquid is returned to the vessel 1 and the filtrate is taken in the vessel 5 and a part of the filtrate is taken in a diaphragm room 2 through a pipe 6. Diaphragm liquid is introduced into a diaphragm liquid vessel 8 through a pipe 7 and moreover, said liquid is taken in a dissoluving vessel 10 through a pipe 9. Then, said liquid is mixed with a replenishing paint 13 and is takin in the bath 1 through a pipe 11. The solubility of the paint 13 is improved and the paint 13 is uniformly dispersed in the bath 1 and the capacity of the electrodeposition is improved.

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