发明申请
US20110155951A1 PROCESS FOR THE PRODUCTION OF METAL OXIDE AND METALLOID OXIDE DISPERSIONS
有权
生产金属氧化物和金属氧化物分散体的方法
- 专利标题: PROCESS FOR THE PRODUCTION OF METAL OXIDE AND METALLOID OXIDE DISPERSIONS
- 专利标题(中): 生产金属氧化物和金属氧化物分散体的方法
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申请号: US12894539申请日: 2010-09-30
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公开(公告)号: US20110155951A1公开(公告)日: 2011-06-30
- 发明人: Wolfgang LORTZ , Christoph Batz-Sohn , Gabriele Perlet , Werner Will , Gerrit Schneider
- 申请人: Wolfgang LORTZ , Christoph Batz-Sohn , Gabriele Perlet , Werner Will , Gerrit Schneider
- 申请人地址: DE Essen
- 专利权人: EVONIK DEGUSSA GmbH
- 当前专利权人: EVONIK DEGUSSA GmbH
- 当前专利权人地址: DE Essen
- 优先权: DE10317066.9 20030414
- 主分类号: C09K3/00
- IPC分类号: C09K3/00
摘要:
Process for the production of an aqueous dispersion of pyrogenically produced metal oxide and metalloid oxide powders with a BET surface area of between 5 and 600 m2/g, with a metal oxide or metalloid oxide content in the dispersion of between 5 and 25 wt. %, comprising the following steps:water, which is optionally adjusted to pH values of between 2 and 4 by adding acids, is circulated from a receiving vessel via a rotor/stator machine, andmetal oxide or metalloid oxide powder is introduced, using a feed device, into the shear zone between the slots in the rotor teeth and the stator slots, continuously or discontinuously and with the rotor/stator machine running, in a quantity such that a predispersion with a solids content of between 20 and 40 wt. % results, and, after all the metal oxide powder or metalloid oxide powder has been added,the feed device closes and shearing continues in such a way that the shear rate is in the range of between 10000 and 40000 s−1, andthen, by dilution, the predispersion is adjusted to the desired solids content of the dispersion while maintaining the dispersing conditions.