| 摘要 |
1,202,938. Anodic deposition of waterdispersed paints. NIPPON PAINT CO. Ltd. Sept. 26, 1967 [Oct. 4, 1966], No.43660/67. Heading C7B. In the anodic deposition of paint on to a conductive article from an aqueous dispersion containing alkali metal, ammonium or amine cations for stabilizing the dispersion, simultaneously with anodic deposition of pigmented film-forming material the liberated cations are also removed from the dispersion by separating the anode compartment from the cathode compartment by a diaphragm formed of vegetable fibre cloth and passing water through the cathode compartment to remove the cations, the fibre used in making the diaphragm cloth being flax, hemp, jute, ramie, Indian mallow, kenaph, Manila hemp, saisal hemp, maguey or maolan. As shown, articles 5 are passed by a roller conveyor through a bath 6 between pairs of cathodes 8 within separate diaphragm bags or in U-shaped diaphragm tubes 7, anodic connections being made to the articles via bus bar 2 and collectors 2. Deionised water is supplied to the cathode compartment via pump output pipe 12 and the cations are removed in solution by overflow 13. The articles coated may be iron plates or wheels. Typical paint dispersions comprise an alkyd resin or a phenol-modified alkyd resin stabilized with triethylamine, ethylene glycol monoethyl ether and red iron oxide alone or with carbon black. Reference is also made to the use of pigment-free alkyd resin varnish solutions and woven cotton cloth diaphragms and diaphragms of cloth of mixtures of the fibres specified above. |
