Precipitated silica
    3.
    发明授权
    Precipitated silica 失效
    沉淀二氧化硅

    公开(公告)号:US5851502A

    公开(公告)日:1998-12-22

    申请号:US673136

    申请日:1996-07-01

    IPC分类号: C01B33/193 H01M2/16 C01B33/12

    摘要: Precipitated silica with the following physical-chemical characteristics: ______________________________________ BET surface: DIN 66131 100-130 m.sup.2 /g DBP absorption DIN 53601 .gtoreq.275 g/100 g (anhydrous) ASTM D 2414 Loss on drying DIN ISO 787/II (2 h/105.degree. C.) ASTM D 280 3.5-5.5 wt. % JIS K 5101/21 Oversize with ALPINE air-jet sieve: >63 .mu.m .ltoreq.10.0 wt. % >150 .mu.m .ltoreq.0.1 wt. % >250 .mu.m .ltoreq.0.01 wt. % Chloride content: .ltoreq.100 ppm ______________________________________ is prepared by introducing water into a precipitation vessel, adding water glass until an alkali value of 5-15 is reached, then adding further water glass and sulfuric acid simultaneously, interrupting the precipitated silica suspension with sulfuric acid to a pH-value of 8.5, with stirring, then continuing acidification with concentrated sulfuric acid to a pH-value of 4, then separating and washing the precipitated silica which has a solids content in the suspension of approx. 88 g/l, liquefying the filter cake obtained, drying it with a spray drier and grinding it. The precipitated silica may be used for the production of battery separators.

    摘要翻译: 具有以下物理化学特性的沉淀二氧化硅: - BET表面:DIN 66131 100-130 m2 / g - DBP吸收DIN 53601> / = 275 g / 100 g - (无水)ASTM D 2414 - 干燥失重DIN ISO 787 / II - (2h / 105℃)ASTM D 280 3.5-5.5wt。 % - JIS K 5101/21 - 用 - ALPINE喷气筛过大 - - > 63微米10.0重量% % - >150μm250μm<0.01wt。 % - 氯化物含量: