| 摘要 |
PURPOSE:To obtain a separator for a lead storage battery in which performance reduction is not caused due to gas accumulation and a binder does not migrate into and is not adsorbed on the negative plate by mixing acid-proof oxidation-proof thermoplastic resin fiber used as a binder to make a glass mat for a lead sotrage battery, then fusing the resin fiber by heating before the glass mat is pressed. CONSTITUTION:Thermoplastic resin fiber used as a binder is prepared from polyethylene, polypropylene, acrylonitrile, polyvinyl chloride, a copolymer which is the combination of two or more of these compounds, or mixture consisting of two or more these compounds. When long fibers only are used in making a glass mat, a nozzle part from which fused glass is drawn as fibers is provided with a section through which thermoplastic resin fibers are supplied. In this case, supplied thermoplastic resin fibers and glass fibers are wound around a drum until a given amount of fibers is wound, when the drum is stopped and the supplied fibers are cut. When short fibers of below 5mm. length are used as glass fibers, glass fibers and short thermoplastic resin fibers are mixed while being stirred in a liquid such as water before they are formed into a sheet in such a manner as to make paper. The thus formed sheet is usually heated at a temperature 20-50 deg.C higher than the softening point of the resin until the glass fibers are fused to the resin, when pressing pressure is applied to the sheet to mold it. |
