发明名称 |
METHOD FOR PRODUCING WATER-ABSORBING POLYMER PARTICLES |
摘要 |
The invention relates to a method for producing water-absorbing polymer particles, having the following steps: a) a polymerization step in which an aqueous monomer solution comprising at least one ethylenically unsaturated acid group-carrying monomer (M) that can be at least partly neutralized and at least one crosslinking agent is polymerized, an aqueous polymer gel being obtained; b) a granulation step in which the aqueous polymer gel with a solid content of 35 to 70 wt.% and a temperature between 75 and 125 °C is pressed out of a high-pressures zone into a low-pressure zone through a perforated plate and a granulate is obtained, the pressure difference between the high-pressure zone and the low-pressure zone equaling 4 to less than 14 bar and the opening ratio of the perforation plate equaling 30 to 80%; c) a drying step in which the granulate is dried to a moisture content of less than 10 wt.%; d) a grinding step and a classifying step, wherein water-absorbing polymer particles are obtained; and e) a surface post-crosslinking step for the water-absorbing polymer particles. The water-absorbing polymer particles have a high swelling rate and a high retention capacity while having an advantageous ratio of the permeability of the swollen gel bed SFC to the centrifuge retention capacity CRC. |
申请公布号 |
WO2015169912(A1) |
申请公布日期 |
2015.11.12 |
申请号 |
WO2015EP60088 |
申请日期 |
2015.05.07 |
申请人 |
BASF SE |
发明人 |
BRAUN, MARKUS ALBERT;HAAG, MONIKA;DEUERLEIN, STEPHAN;KLOCK, VOLKER;KRAUSS, ROLAND |
分类号 |
C08F2/01;C08F2/10;C08F220/06 |
主分类号 |
C08F2/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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