A method for preparing highly substituted polyanionic cellulose
By using an organic amine gas pressurization composite alkalization process, the internal hydrogen bond structure of cellulose is destroyed, the degree of alkalization is increased, and highly substituted polyanionic cellulose is prepared, which solves the problem of insufficient substitution degree in the existing technology and improves product performance.
CN122302098APending Publication Date: 2026-06-30CHINA PETROLEUM & CHEMICAL CORP +2
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2024-12-27
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
Existing technologies make it difficult to prepare highly substituted polyanionic cellulose, resulting in poor performance in terms of dispersion properties, temperature resistance, and salt resistance.
Method used
An organic amine gas pressurization composite alkalization process is adopted, in which organic amine gas is released through multiple filling and depressurization cycles to destroy the internal hydrogen bond structure of cellulose, improve the degree of alkalization, and combine it with etherification reaction to prepare highly substituted polyanionic cellulose.
Benefits of technology
It significantly improved the degree of cellulose substitution, enhancing dispersion properties, temperature resistance, and salt resistance.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention discloses a method for preparing highly substituted polyanionic cellulose, comprising the following steps: 1) alkalizing a system consisting of refined cotton, organic solvent, and alkaline solution by introducing excess organic amine gas and stirring; 2) after alkalization in step (1), heating and depressurizing to remove the organic amine gas, and then adding an etherifying agent to the reaction system for reaction; 3) after the reaction in step (2), the product is neutralized with acetic acid, filtered, washed with excess 90% ethanol, filtered again, dried, and pulverized to obtain highly substituted polyanionic cellulose. This invention promotes the degree of alkalization of cellulose and increases the degree of subsequent etherification reaction. The degree of substitution of the polyanionic cellulose prepared by this invention can reach over 1.40, which is higher than the degree of substitution of products prepared by ordinary solvent methods, and has high application value.
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