固着剂作用下溶解物质与胶体物质的相互影响

Study on interaction between dissolved and colloidal substances under treatment of fixing agent

以氧化淀粉、松香酸及两者的混合物,分别模拟为溶解物质(DS)体系、胶体物质(CS)体系及溶解与胶体物质(DCS)共存体系,采用3种不同特性的聚胺固着剂加以作用,固液分离后测定模型物的残余浓度,考察固着剂作用下DS、CS、DCS的稳定性及相互影响。结果表明:在单一的DS、CS体系中,固着剂难以大幅去除DS,但比较容易去除CS;混合的DCS体系中,DS可附着在CS上被更多地去除,CS则因DS的稳定作用更难去除。综合来看,分子质量大而电荷密度高的固着剂去除DCS的效果更佳。

Oxidized starch,rosin acid and their mixture were used respectively to model the dissolved substances（DS）,colloidal substances（CS）,and dissolved and colloidal substances（DCS）in papermaking.Three polyamines fixing agents with different characteristics were used to treat the model systems.Then their effects on the stability of the systems were compared by analyzing the residual concentration of the model compounds after solid-liquid separation,and the interaction between the dissolved substance and the colloidal substance was inferred.The results showed that in the single systems,the effectiveness of the fixing agents in removing theDS is poor while their effectiveness in removing CS is good.However,in the mixed DCS system,the removal of DS is improved while that of CS is reduced.The results indicate that in the mixed system,DS is attached to the CS particle surfaces so it can improve the stability of the latter,however,once CS agglomeration takes place,more DS is removed.In general,fixing agents with higher molecular weight and higher charge density tend to have better effectiveness in removing DCS.