公开(公告)号：EP2787105A4

公开(公告)日：2015-07-29

申请号：EP12852751

申请日：2012-11-06

Applicant: CHINESE ACAD TECH INST PHYSICS

Inventor： WU MIN ,  HUANG YONG ,  KUGA SHIGENORI ,  HUANG PEI

IPC: D01F2/00 ,  C08B3/00 ,  C08B3/20 ,  C08B16/00 ,  C08L1/10 ,  C08L1/12 ,  D01F2/28

CPC classification number: C08L1/12 ,  C08B3/00 ,  C08B3/20 ,  C08B16/00 ,  C08L1/10 ,  C08L2201/56 ,  C08L2205/16 ,  D01F2/28

Abstract: Disclosed is a method for preparing stably dispersed cellulose nanofibers. The method comprises following steps: 1) mixing cellulose and an organic solvent, the percentage of the cellulose being 1% to 15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), the molar ratio of the esterification agent to the cellulose being from 1: 0.1 to 4; 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 100-100 µm in length is obtained, an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers being occurring at the meantime of the breaking. Since the surface of the cellulose nanofibers with the esterified surface is hydrophobized by alkyl molecular chains, the dispersant solvent may be DMF, or may be replaced by other solvents. Moreover, when recombining the cellulose nanofibers of the invention with the synthetic resins, compatibility of the cellulose nanofibers to the matrix is better than that of the untreated cellulose, and thus the strength of the composite material may be improved.