Method for manufacturing carboxymethylated cellulose nanofiber
AssigneeNippon Paper Industries Co., Ltd.
InventorsKazuhiko Inoue, Takeshi Nakatani, Yusuke Tada
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Abstract
Provided is a novel manufacturing method whereby a carboxymethylated cellulose nanofiber dispersion having high tarnasparency can be obtained economically. In carboxymethylation of cellulose in the present invention, mercerization is performed in water as the main solvent, after which carboxymethylation is performed in a solvent mixture of water and an organic solvent, By defibrating the resultant carboxymethylated cellulose, a carboxymethylated cellulose nanofiber dispersion having high transparency can be obtained economically.
Claims15
A method for producing a carboxymethylated cellulose nanofiber, the method comprising:
- treating cellulose with a mercerizing agent to prepare mercerized cellulose;
- reacting the mercerized cellulose with a carboxymethylation agent to prepare carboxymethylated cellulose, wherein the carboxymethylated cellulose is one that maintains at least a portion of a fibrous shape when dispersed in water;
- and
- defibrating the carboxymethylated cellulose to produce a carboxymethylated cellulose nanofiber;
- wherein
- preparing mercerized cellulose is performed in a solvent containing 70% by mass or more of water, and preparing carboxymethylated cellulose is performed in a mixed solvent of water and an organic solvent;
- wherein the mixed solvent in preparing the carboxymethylated cellulose is a solvent comprising 50 to 99% by mass of an organic solvent.
Dependencies are inferred from the claim text.