公开(公告)号：EP3140325A1

公开(公告)日：2017-03-15

申请号：EP15722698.6

申请日：2015-05-07

Applicant: BASF SE

Inventor： BRAUN, Markus Albert ,  HAAG, Monika ,  DEUERLEIN, Stephan ,  KLOCK, Volker ,  KRAUSS, Roland

IPC: C08F2/01 ,  C08F2/10 ,  C08F220/06

CPC classification number: A61L15/24 ,  A61L15/60 ,  B01J20/267 ,  B01J20/28011 ,  C08F2/001 ,  C08F2/10 ,  C08F220/06 ,  C08J3/245 ,  C08J2333/02 ,  C08F2222/1026 ,  C08L33/02

Abstract: 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.

Abstract translation: 提供了一种生产吸水性聚合物颗粒的方法，该方法包括：a）聚合步骤，其中包含至少一个带有酸基并可能至少部分中和的至少一种烯属不饱和单体M的单体水溶液和至少一种交联剂是 聚合得到聚合物水凝胶; b）造粒步骤，其中固体含量为35至70重量％，温度为75至125℃的聚合物凝胶水凝胶被迫从高压区通过模板进入低压区 获得颗粒，高压区和低压区之间的压力差为4至小于14巴，模板的孔径比为30至80％; c）干燥步骤，其中将所述颗粒干燥至含水量小于10重量％; d）研磨步骤和分级步骤以获得吸水性聚合物颗粒; 和e）吸水性聚合物颗粒的表面交联。 吸水性聚合物颗粒具有高溶胀速率和高保留能力以及膨胀凝胶层SFC的渗透性与离心保留容量CRC的良好比率。

公开(公告)号：EP2861633B1

公开(公告)日：2016-08-10

申请号：EP13727895.8

申请日：2013-06-10

Applicant: BASF SE

Inventor： KRAUß, Roland ,  GIEGER, Thomas ,  KLOCK, Volker

IPC: B07B1/12 ,  C08F6/00 ,  A61L15/60

CPC classification number: B07B1/12 ,  A61L15/60 ,  C08F6/008 ,  C08L33/08