Preparation method of cellulose acetate butyrate

Abstract

The invention belongs to the technical field of cellulose derivatives, and particularly relates to a preparation method of cellulose acetate butyrate. The method comprises the steps: adding the refined cotton linters and the activated carbon adsorbing the glacial acetic acid into a butyric acid aqueous solution, stirring, activating, and filtering to obtain an activated mixture of the refined cotton linters and the activated carbon; adding the mixture of the activated refined cotton linters and the activated carbon into a solvent, stirring, and filtering to obtain a solution containing activated cellulose; adding concentrated sulfuric acid, acetic anhydride and butyric anhydride into the solution containing the activated cellulose for esterification reaction to obtain esterified feed liquid; adding water into the esterified feed liquid for stirring, pressurizing and hydrolyzing to obtain hydrolysate; and neutralizing, filtering and precipitating the hydrolysate to obtain a precipitate, and washing, cooking and drying the precipitate to obtain the cellulose acetate butyrate. The method has the characteristics of good activation effect, high reaction efficiency, high yield and short hydrolysis time.

Description

technical field [0001] The invention belongs to the technical field of cellulose derivatives, in particular to a preparation method of cellulose acetate butyrate. Background technique [0002] The development of cellulose derivatives has a long history, especially since the 1970s, with the understanding of the limited energy and petroleum resources, and the cellulose material products themselves have the characteristics that other synthetic polymer materials do not have, in the high More and more attention has been paid to cellulose derivatives in the research and utilization of molecular materials. Cellulose ester is one of the important cellulose derivatives. [0003] Cellulose acetate butyrate (CAB) is a cellulose mixed ester obtained by introducing acetyl and butyryl groups into the macromolecular composition of cellulose. Cellulose acetate butyrate has good solubility, flexibility, weather resistance, moldability, etc., and has good compatibility with resins and high-...

AI Technical Summary

Problems solved by technology

In this patent, the method of directly spraying acetic acid on the wood pulp is used for activation, and the activation effect is poor; the traditional heating method is still used in the esterification reaction, and the heating is uneven. At the same time, the hydrolysis time is long and the cellulose degradation is serious.