Method for producing water-absorbing resin particle
    80.
    发明专利
    Method for producing water-absorbing resin particle 审中-公开
    生产吸水树脂颗粒的方法

    公开(公告)号:JP2006089525A

    公开(公告)日:2006-04-06

    申请号:JP2004273503

    申请日:2004-09-21

    IPC分类号: C08F2/32 B01J20/26 B01J20/30

    CPC分类号: C08F2/14

    摘要: PROBLEM TO BE SOLVED: To provide a method for producing a water-absorbing resin particle comprising small amounts of fine powder and coarse powder and having a narrow particle size distribution. SOLUTION: The method for producing a water-absorbing resin particle by subjecting a water-soluble ethylenic unsaturated monomer to reversed phase suspension polymerization comprises (A) subjecting an aqueous solution of a water-soluble ethylenic unsaturated monomer to first-stage reversed phase suspension polymerization in the presence of a surfactant and/or a polymer protective colloid and, if necessary, an internal crosslinking agent by using a water-soluble radical polymerization initiator in a hydrocarbon-based solvent, (B) adding an aqueous solution of a water-soluble ethylenic unsaturated monomer, which comprises a water-soluble radical polymerization initiator, 1.2-2.5 mols of a water-soluble ethylenic unsaturated monomer based on 1 mol of the water-soluble ethylenic unsaturated monomer subjected to the first-stage polymerization and optionally an internal crosslinking agent to the reaction mixture after the first-stage reversed phase suspension polymerization in a state in which the surfactant and/or the polymer protective colloid are dissolved in the hydrocarbon-based solvent and (C) then precipitating the surfactant and/or the polymer protective colloid and carrying out second-stage reversed phase suspension polymerization. COPYRIGHT: (C)2006,JPO&NCIPI

    摘要翻译: 要解决的问题:提供一种包含少量细粉末和粗粉末并且具有窄粒度分布的吸水性树脂颗粒的制造方法。 解决方案:通过使水溶性烯属不饱和单体进行反相悬浮聚合来制造吸水性树脂颗粒的方法包括:(A)将水溶性烯属不饱和单体的水溶液首先反向 在表面活性剂和/或聚合物保护胶体存在下进行相悬浮聚合,如果需要,在烃系溶剂中使用水溶性自由基聚合引发剂,根据需要使用内部交联剂,(B) 水溶性烯属不饱和单体,其包含水溶性自由基聚合引发剂,1.2-2.5摩尔水溶性烯属不饱和单体,基于1摩尔经过第一阶段聚合的水溶性烯属不饱和单体和任选地 在第一阶段反相悬浮聚合之后的反应混合物中的内部交联剂处于w状态 表面活性剂和/或聚合物保护胶体溶解在烃类溶剂中,(C)然后沉淀表面活性剂和/或聚合物保护胶体并进行第二阶段反相悬浮聚合。 版权所有(C)2006,JPO&NCIPI