公开(公告)号：US5009971A

公开(公告)日：1991-04-23

申请号：US391067

申请日：1989-08-09

申请人： Harlan B. Johnson ,  Samuel B. Laferty ,  Melvin P. Wagner ,  Shantilal M. Mohnot

发明人： Harlan B. Johnson ,  Samuel B. Laferty ,  Melvin P. Wagner ,  Shantilal M. Mohnot

IPC分类号： D04H1/42 ,  H01M2/16

CPC分类号： H01M2/1646 ,  D04H1/4318 ,  H01M2/162 ,  H01M2300/0005 ,  Y10T428/259

摘要： Described is a porous flexible sheet of about 93 to 99.5 weight percent amorphous precipitated silica and from about 0.5 to about 7 weight percent fibrillated, unsintered polymeric material, e.g., polytetrafluoroethylene. The sheet is useful as a separator in absorbed electrolyte gas recombinant batteries, e.g., lead-acid batteries, and has a tensile strength of less than 75 pounds per square inch (0.5 MPa). The sheet preferably has a porosity of from 85 to 92 percent and exhibits an electrical resistance of less than 3.5 milliohm-in.sup.2 /10 mil when saturated with 37 percent sulfuric acid. The sheet is prepared by subjecting a dry homogeneous mixture of the silica and polymeric material, e.g., polytetrafluoroethylene, in the above proportions to mechanical shear blending forces to fibrillate the polymer and thereafter dry forming the resulting admixture into sheet form.

摘要翻译： 描述了约93至99.5重量％的无定形沉淀二氧化硅和约0.5至约7重量％原纤化的未烧结的聚合物材料例如聚四氟乙烯的多孔柔性片材。 该片材可用作吸收的电解质气体重组电池（例如铅酸电池）中的隔板，并且具有小于75磅/平方英寸（0.5MPa）的拉伸强度。 当用37％硫酸饱和时，片材优选具有85-92％的孔隙率并且表现出小于3.5毫欧姆/英寸2/10密耳的电阻。 通过以上述比例将二氧化硅和聚合物材料（例如聚四氟乙烯）的干均匀混合物经受机械剪切共混力使聚合物原纤化，然后将所得混合物干燥形成片状来制备片材。