| 摘要 |
PURPOSE:To stabilize viscosity of active material paste for a long hour to make continuous production of a paste type cadmium negative plate possible by containing inner ester of hydroxy-carboxylic acid and boric acid in active material paste. CONSTITUTION:Active material paste 4 is prepared by kneading 100 wtpts cadmium oxide powder, 18 wtpts metallic cadmium powder, 0.6 wtpts methylcellulose, 5 wtpts polyvinyl chloride latex emulsion, 0.8 wtpts short fibers of vinyl chloride-acrylic copolymer, 0.3 wtpts sodium ascorbate serving as a hydration retarder of cadmium oxide, and 0.2 wtpts potassium borate. The paste 4 is applied to a nickel plated steel porous plate 2 with a paste coating unit shown in the figure, and dried at about 90 deg.C for one hour to form a negative plate. Viscosity of the active material paste 4 is stabilized for a long hour and the continuous production of a paste type cadmium negative plate is made possible. |
