新型两性吸附树脂PSN的合成

Preparation of amphoteric adsorbent PSN

以苯胺、浓硫酸、苯酚和甲醛为原料 ,经磺化、预聚、交联三步反应制得两性吸附树脂PSN。考察了反应物配比、反应温度、反应时间和催化剂对各步反应的影响 ,得到最佳反应条件 :苯胺和浓硫酸在 1 85～ 1 90℃磺化 5h ,产率可达 75 7% ,未纯化产物可直接与甲醛在硫酸催化下进行预缩聚。通过改变反应物的用量 ,可制备具有不同阴。

PSN resin was prepared by sulfonation, first-step polycondensation and cross-linking from aniline, phenol, formaldehyde and concentrated sulfuric acid. The effects from reactants ratio, reaction temperature, time and catalyst to every step of the preparation are studied. The results show that the optimal condition is follows: Aniline and concentrated sulfuric acid react at 185-190°C for 5 h with 75.7% sulfonation yield, and unpurified sulfonation products can polycondensate with formaldehyde with sulfuric acid as catalyst. The ratio of reactants can control the resins with different numbers of anionic and cationic groups.