| 摘要 |
<p>Disclosed is a method for producing a highly transparent composite material, wherein MFC (microfibrillated cellulose) is uniformly dispersed in a thermoplastic resin, thereby improving the mechanical strength thereof and providing heat resistance thereto. A cellulose fiber dispersion liquid, in which cellulose fibers are uniformly dispersed, is produced by pulverizing cellulose into MFC at high concentration without gelatinizing the cellulose. Specifically disclosed is a method for producing a cellulose fiber-containing resin material that contains a thermoplastic resin and surface-treated cellulose fibers having an average fiber diameter of not less than 2 nm but not more than 200 nm. The method for producing a cellulose fiber-containing resin material is characterized by comprising a first mixing step in which the surface-treated cellulose fibers, an organic solvent and a first thermoplastic resin are mixed, and a second mixing step in which a second thermoplastic resin having a higher molecular weight than the first thermoplastic resin is additionally mixed into the resulting mixture.</p> |
