| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique that can adsorb and remove zinc ions from an electroless nickel plating solution with high selectivity.SOLUTION: A zinc ion-adsorbing resin has an alkyl phosphonic acid having a concentration above 15 wt.% and below 30 wt.% supported on a porous resin base material including an acrylic resin, or a styrene resin with a functional group selected from the group consisting of a sulfo group and an amino group. An alkyl phosphonic acid that may be used is preferably 2-ethylhexyl phosphonic acid mono-2-ethylhexyl. |
