摘要:
Described is a water-absorbent composition containing from 30 to 100% by weight, based on the water-absorbent composition, of water-insoluble water-swellable hydrogels characterized by the following features: Centrifuge Retention Capacity (CRC) of at least 24 g/g, Saline Flow Conductivity (SFC) of at least 80×10−7 cm3 s/g and Free Swell Rate (FSR) of at least 0.15 g/g s and/or Vortex Time of not more than 160 s.
摘要翻译:描述了基于吸水性组合物含有30-100重量%的水不溶性水溶胀性水凝胶的吸水性组合物,其特征在于以下特征:离心保留容量(CRC)为至少24g / g,至少80×10 -7 cm 3 / s的盐水流动电导率(SFC)和至少0.15g / gs和/或不超过160s的涡旋时间的无膨胀速率(FSR)。
摘要:
This invention is a method for converting fine particles of superabsorbent polymers into larger particles. The invention is primarily directed to aqueous solution processes for preparing superabsorbent polymers. In such aqueous solution polymerization methods, the polymerization reaction product is a high viscosity gel which is dried and ground into particles. In this grinding step, a portion of the product is produced as undesired fine particles having poor absorbency and poor fabrication properties; i.e. they "gel block" and dust. According to the invention, fine superabsorbent polymer particles (up to about 3 parts) are mixed with the high viscosity reaction product gel (100 parts) containing about 20 parts by weight of superabsorbent polymer and water (5 parts per part of recycled particles) to form a mixture with improved rheological properties. The resulting mixture can be processed at a higher rate than a reaction product gel of equal solids content which results in a higher product yield and increased productivity.