Preparation method of dodecyl succinic anhydride modified hydroxyethyl cellulose

The invention discloses a preparation method of dodecyl succinic anhydride modified hydroxyethyl cellulose, and belongs to the technical field of polymer chemistry. The invention provides a preparation method of dodecyl succinic anhydride modified hydroxyethyl cellulose. The preparation method comprises the following steps: carrying out activation reaction on cellulose, carrying out hydroxyethylation reaction, carrying out esterification reaction on a modifier and hydroxyethyl cellulose, carrying out secondary hydroxyethylation reaction, neutralizing, washing and drying. Based on different reaction activities of three active hydroxyl groups C2, C3 and C6 on a glucose unit of cellulose, hydroxyl groups with relatively high activity are subjected to a hydroxyethylation reaction and then subjected to an esterification reaction with a modifier, then other hydroxyl groups are subjected to a hydroxyethylation reaction, and uniformly substituted dodecyl succinic anhydride modified hydroxyethyl cellulose is obtained.