SEPARATOR FOR LEAD-ACID BATTERY AND METHOD FOR MANUFACTURING THE SAME

摘要

A separator for lead-acid battery is constituted of a synthetic pulp in which texture of constituent fibers is complicated, and a laminated sheet (III) forming a coated layer (II) of an inorganic powder and an acid-proof polymer at least on one surface of a porous substrate sheet (I), comprising an acid-proof inorganic powder and an acid-proof inorganic fiber, and manufactured by a wet papermaking process. The separator can be formed of a sheet-like or a bag-like laminated sheet, and it is possible to form projecting sections on at least one surface of the sheet (III) or no projecting section on the surfaces of the sheet (III). In a method for manufacturing the separator, the laminated sheet (III) is manufactured in such a way that the porous substrate sheet (I) is prepared by a wet papermaking process by scattering the synthetic pulp in which texture of constituent fibers is complicated and acid-proof inorganic powder and/or acid-proof inorganic fibers in a medium, and the coated layer (II) is formed by coating a pasty mixed solution prepared by adding water to the inorganic powder and acid-proof polymer to at least one surface of the sheet (I) and drying the solution so that the solid content percentage amounts to 10-70 wt.%. The above-mentioned projecting sections can be formed through an embossing process or rib forming process. When this invention is used, a separator for lead-acid battery having a lower electrical resistance and an excellent acid-proof can be obtained, and a sheet-like or bag-like separator having projecting sections on at least one surface of the laminated sheet (III) or having no projecting section on the surfaces of the sheet (III) can be obtained.