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    • 76. 发明申请
    • RECYCLING OF FINE PARTICLES IN THE PRODUCTION OF WATER-ABSORBENT POLYMER PARTICLES
    • 精细颗粒在生产吸水聚合物颗粒中的回收
    • WO2015163519A1
    • 2015-10-29
    • PCT/KR2014/003677
    • 2014-04-25
    • SONGWON INDUSTRIAL CO., LTD.
    • PARK, Jeong Beom
    • C08J3/12C08F2/10C08F2/01A61L15/60
    • A61L15/60C08F2/10C08J3/075C08J3/12C08J3/245C08J2333/02
    • The invention generally relates to a process for the preparation of surface-crosslinked water-absorbent polymer particles, comprising a sequence of process steps of (i) preparing an aqueous monomer solution comprising at least one partially neutralized, monoethylenically unsaturated monomer bearing carboxylic acid groups (α1) and at least one crosslinker (α3); (ii) adding a polymerization initiator or a at least one component of a polymerization initiator system that comprises two or more components to the aqueous monomer solution; (iii) optionally decreasing the oxygen content of the aqueous monomer solution; (iv) charging the aqueous monomer solution into a polymerization reactor; (v) polymerizing the monomers in the aqueous monomer solution in the polymerization reactor; (vi) discharging the polymer gel out of the polymerization reactor and comminuting the polymer gel, thereby obtaining polymer gel particles; (vii) drying the polymer gel particles; (viii) grinding the dried polymer gel particles thereby obtaining water-absorbent polymer particles; (ix) contacting at least a part of the water-absorbent polymer particles with a crosslinking composition, comprising a further crosslinker, thereby obtaining surface-crosslinked water-absorbent polymer particles; wherein in process step (vi) a plurality of fine surface-crosslinked water-absorbent polymer particles is added to the polymer gel or the polymer gel particles or both.
    • 本发明一般涉及一种制备表面交联吸水性聚合物颗粒的方法,其包括以下步骤序列:(i)制备含有至少一种部分中和的单烯属不饱和单体(含有羧酸基团) α1)和至少一种交联剂(α3); (ii)将聚合引发剂或至少一种包含两种或多种组分的聚合引发剂体系的组分加入到单体水溶液中; (iii)任选地降低单体水溶液的氧含量; (iv)将单体水溶液装入聚合反应器中; (v)在聚合反应器中使单体在单体水溶液中聚合; (vi)将聚合物凝胶从聚合反应器中排出并粉碎聚合物凝胶,从而获得聚合物凝胶颗粒; (vii)干燥聚合物凝胶颗粒; (viii)研磨干燥的聚合物凝胶颗粒从而得到吸水性聚合物颗粒; (ix)使至少一部分吸水性聚合物颗粒与交联组合物接触,所述交联组合物包含另外的交联剂,从而获得表面交联的吸水聚合物颗粒; 其中在工艺步骤(vi)中,将多个细小的表面交联的吸水聚合物颗粒加入到聚合物凝胶或聚合物凝胶颗粒中或两者。