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    • 59. 发明授权
    • Method for producing polyacrylic acid (salt)-based water absorbent resin
    • 制备聚丙烯酸(盐)基吸水树脂的方法
    • US09550843B2
    • 2017-01-24
    • US14647311
    • 2013-11-27
    • NIPPON SHOKUBAI CO., LTD.
    • Satoshi MatsumotoMakoto MatsumotoSeiji KatoKazumasa KonishiKenji KadonagaShinichi Fujino
    • C08F120/06C08J3/12C08F22/02C08J3/24
    • C08F22/02C08J3/245C08J2333/02
    • An object of the present invention is to provide a simple method for improving and stabilizing the physical properties (for example, liquid permeability) of a water absorbent resin, without requiring investment in expensive facilities or modification of raw materials. In particular, the object is to provide a method which is useful in the large-scale production of a water absorbent resin. The method for producing polyacrylic acid (salt)-based water absorbent resin of the present invention includes, in order, a step in which an acrylic acid (salt)-based monomer aqueous solution is polymerized, a step in which the water-containing gel-like crosslinked polymer obtained in the polymerization step is dried, a step in which the dried polymer obtained in the drying step is pulverized, and a classification step which takes place after the drying step or after the pulverizing step, wherein, at the time of providing the dried polymer to the roll mill used in the pulverizing step, the dried polymer is provided in a dispersed state in the axial direction of the roll of the roll mill.
    • 本发明的目的是提供一种用于改善和稳定吸水性树脂的物理性能(例如透液性)的简单方法,而不需要投资昂贵的设备或改变原料。 特别地,本发明的目的是提供一种在大规模生产吸水性树脂中有用的方法。 本发明的聚丙烯酸(盐)系吸水性树脂的制造方法依次包括丙烯酸(盐)类单体水溶液聚合的工序,其中含水凝胶 在聚合步骤中获得的类似的交联聚合物被干燥,将在干燥步骤中获得的干燥聚合物粉碎的步骤和在干燥步骤之后或粉碎步骤之后发生的分级步骤,其中在 将干燥的聚合物提供给在粉碎步骤中使用的辊磨机中,干燥的聚合物以辊磨机的辊的轴向分散状态提供。