申请人:Podszun Wolfgang
公开号:US20060199892A1
公开(公告)日:2006-09-07
The invention relates to a process for producing monodisperse ion-exchanger gels with a particle size of from 5 to 500 μm, obtainable via a) production of a non-crosslinked monodisperse seed polymer with a particle size of from 0.5 to 20 μm via free-radical-initiated polymerization of monoethylenically unsaturated compounds in the presence of a non-aqueous solvent, b) addition of an active styrene-containing monomer mixture as feed to this seed polymer, permitting the monomer mixture to penetrate into and swell the seed, and polymerizing the mixture at an elevated temperature, if appropriate with one or more repetitions of the steps of addition of monomer mixture, penetration and swelling, and polymerization, and where during the final addition the monomer mixture comprises from 2 to 50% by weight of crosslinking agent, and c) functionalization by means of a sulfonating agent to give cation exchangers or via amidomethylation with subsequent hydrolysis to give anion exchangers, or chloromethylation with subsequent amination.
本发明涉及一种制备粒径为5至500μm的单分散离子交换凝胶的方法,其可通过以下步骤获得:a)在非水溶剂存在下,通过自由基引发的单乙烯类不饱和化合物聚合制备粒径为0.5至20μm的非交联单分散种子聚合物;b)向该种子聚合物中加入活性苯乙烯类单体混合物作为原料,使单体混合物渗透并膨胀种子聚合物,并在升高的温度下聚合混合物,如有必要,可重复进行加入单体混合物、渗透和膨胀、聚合等步骤,其中在最后一次加入时,单体混合物包含2至50重量%的交联剂;c)通过磺化剂进行功能化,得到阳离子交换剂,或通过酰胺甲基化并随后水解得到阴离子交换剂,或通过氯甲基化并随后胺化。