Modified cellulose flocculant—etherification reaction (1)

Modified cellulose flocculant

There are three ways to prepare modified cellulose flocculants: ① general chemical modification, that is, etherification; ② graft copolymerization; ③ modification of graft copolymer

Etherification reaction

[Preparation method] There are two ways to prepare amphoteric cellulose from cellulose through etherification: ① using carboxymethyl cellulose for cationization; ② directly using cellulose for carboxymethylation and cationization

Since the structure of CMC is similar to that of cellulose, it contains a certain number of hydroxyl groups that are not carboxymethylated on the macromolecular skeleton.

On the basis of the above reaction, in the process of preparing quaternary ammonium salts from tertiary amines, the corresponding functional groups (such as chlorine substituents, epoxy groups, etc.

Epoxy cationic etherifying agent:

Halogen-substituted cationic etherifying agent:

Using carboxymethyl cellulose as a raw material, the preparation of amphoteric cellulose by etherification reaction is mainly carried out by the reaction of polymer side groups

At present, the main methods (one-step method and step-by-step method) for preparing cationized derivatives by this method can be simply expressed as follows:

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