羧甲基甲壳素基助留助滤剂的制备及性能研究

Preparation of Carboxymethyl Chitin Based Retention and Drainage Aids and Their Retention and Drainage Behaviors Investigation

摘要:

以甲壳素（CH）为原料，氯乙酸钠为醚化剂，合成不同取代度（DS=0.4，0.5，0.6）的水溶性羧甲基甲壳素（CCH），并用红外光谱（IR）、X射线衍射（XRD）对其结构进行表征。结果表明羧甲基基团成功引入到CH骨架上，并且破坏了结晶区。同时研究了CCH对纸浆的助留助滤性能，表明CCH的取代度越大其助留助滤效果越好，当取代度为0.6，添加量0.5%时，获得最佳的助留助滤性能。进一步选择聚合氯化铝（PAC）与CCH构建二元体系，发现二元体系的助留助滤效果明显优于一元体系。

Abstract:

A type of novel retention and drainage aids, water-soluble carboxymethyl chitin (CCH) with different degree of substitution (DS=0.4, 0.5, 0.6), were prepared using chitin (CH) as the raw material and sodium chloroacetate as etherifying agent. The structure of CCH was characterized by infrared spectroscopy (IR), x-ray diffraction analysis (XRD). The results indicated that carboxymethyl group was successful introduced into CH, which resulted in a destruction of crystalline region of CH. The retention and drainage tests showed that the retention and drainage performances became better with the increasing of DS, and the best performances were obtained when the addition amount of CCH with DS=0.6 was 0.5%. In order to further improve the retention and drainage performances of CCH, CCH/PAC dual system was developed by introducing polymeric aluminum chloride (PAC) with high cationic charge density, the retention and drainage performances of CCH/PAC were significantly better than alone using CCH.