Patent ID: 9725583
Date: 2017-08-08
CPC Classifications: C08B,C08L,D01F

Claim:
1. A method for preparing stably dispersed cellulose nanofibers, comprising the following steps: 1) mixing a cellulose with an organic solvent, the percentage of the cellulose being 1%-15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), wherein the molar ratio of the esterification agent to the cellulose is 1:0.1 to 4; and 3) physically breaking the resultant mixture of step 2) until a suspension liquid with stably dispersed cellulose nanofibers of 2-1000 nm in diameter and 10-100 μm in length is obtained, wherein an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers occurs during the breaking step, wherein the organic solvent contains no hydroxyl group, wherein the organic solvent is selected from the group consisting of acetone, methanamide, ethanamide, N,N-dimethylformamide, N,N-dimethylacetamide, phenylamine, tetrahydrofuran, diethyl ether, benzene, methylbenzene, dimethylbenzene, chlorobenzene, hexane, dimethyl sulfoxide, dioxane, ethyl acetate, ethanoic acid, ethanenitrile, pyridine, methacrylic acid, and trichloromethane, and wherein the esterification agent is selected from the group consisting of acetyl chloride, butyryl chloride, hexanoyl chloride, and lauroyl chloride.