Pigment disperse sizing agent and electrophoretic paint

Abstract

The purpose of the invention is to provide a pigment dispersing paste capable of saving energy of coating apparatus and saving redispersibility of dye of the apparatus and electrophoretic paint. Specifically, the invention relates to a pigment dispersing paste for electrophoretic paint, containing pigment dispersing resin (A), tinting color (B), color filler (C) and cellulose composition (D); responding to the solid component 100 weight parts of the resin (A), the paste is characterized by containing: (1) 60 to 800 weight parts of (b1) titanium dioxide coated by 0.1 to 10.0 weight parts of Al2O3 without SiO2 on 100 weight parts of titanium dioxide as matrix; and / or (b2) ferric oxide as the of tinting color (B); (2) 2 to 200 weight parts of micro barium sulfate with the mean grain size of linear particle being 0.01 to 0.1 micron as the color filler (C); and (3) 1 to 50 weight parts of cellulose composition (D).

Description

technical field The present invention relates to a pigment dispersion slurry excellent in redispersibility of pigments capable of saving energy and equipment for coating equipment, and an electrophoretic paint using the pigment dispersion slurry. Background technique Electrophoretic paint is widely used as a primer for metal products such as automobile bodies because of its excellent painting workability and good rust resistance. Pigment dispersion slurries used in such electrophoretic coatings are usually stored in containers or cylindrical tanks and kept in warehouses after production. However, if they are not stirred regularly, the pigments may settle and use may be hindered. Especially when transporting foreign coating equipment, since the pigment dispersion slurry put into the cylindrical tank is in a state of non-stirring for a long time, it is urgent to improve the storage stability of the pigment dispersion slurry. On the other hand, in order to prevent the sedimen...

AI Technical Summary

Problems solved by technology

However, when Patent Document 3 is applied to an electrophoretic paint for obtaining a white coating film containing titanium dioxide with a large specific gravity or an electrophoretic coating for obtaining a brown coating film using iron oxide, it is difficult to obtain a long time in the coating production line, especially during continuous breaks, etc. If the stirring and circulation of the electrophoretic coating are stopped for a long time, the redispersibility of the coating is insufficient during re-operation. Therefore, pitting and depressions occur on the electrophoretic coating surface of the coated article, especially on the horizontal surface, and need to be improved.

Images