公开(公告)号：US20170065739A1

公开(公告)日：2017-03-09

申请号：US15308383

申请日：2015-05-07

Applicant: BASF SE

Inventor： Markus Braun ,  Monica Haag ,  Stephan Deuerlein ,  Volker Klock ,  Roland Krauss

IPC: A61L15/24 ,  B01J20/28 ,  C08J3/24 ,  B01J20/26 ,  C08F220/06 ,  A61L15/60

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: A process for producing water-absorbing polymer particles is provided, comprising a) a polymerization step in which an aqueous monomer solution comprising at least one ethylenically unsaturated monomer M which bears acid groups and may have been at least partly neutralized and at least one crosslinker is polymerized to obtain an aqueous polymer gel; b) a pelletization step in which the aqueous polymer gel having a solids content of 35 to 70% by weight and a temperature of 75 to 125° C. is forced from a high-pressure zone through a die plate into a low-pressure zone and pellets are obtained, the pressure differential between the high-pressure zone and the low-pressure zone being 4 to less than 14 bar and the orifice ratio of the die plate being 30 to 80%; c) a drying step in which the pellets are dried to a moisture content of less than 10% by weight; d) a grinding step and a classifying step to obtain water-absorbing polymer particles; and e) surface crosslinking of the water-absorbing polymer particles. The water-absorbing polymer particles have a high swell rate and a high retention capacity combined with a favorable ratio of permeability of the swollen gel bed SFC to 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，其中包含至少一种带有酸基团且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 得到颗粒，高压区与低压区之间的压力差为4〜14巴，模板的孔径比为30〜80％。 c）干燥步骤，其中将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的溶胀速率和高的保留能力以及膨胀的凝胶床SFC的渗透性与离心保留容量CRC的良好比率。