Novel hydrophobically modified nano-cellulose and preparation method and application thereof

The invention discloses novel hydrophobically modified nano-cellulose and a preparation method and application thereof, and belongs to the technical field of functional coating. The method includes firstly subjecting cellulose to oxidation pretreatment with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) to obtain cellulose with carboxyl; then performing high-pressure homogenization to obtain nano-cellulose; performing hydrophobic modification of nano-cellulose in two steps in which glutaric anhydride and propionic anhydride as composite anhydrides are adopted as reagents for esterification modification of the nano-cellulose in the first step, and tris(decyl)amine and n-decylamine are utilized to react with the esterified modified nano-cellulose through electrostatic adsorption to form a complex, namely the novel hydrophobically modified nano-cellulose, in the second step. When the prepared modified nano-cellulose is applied onto the writing and painting paper, strength of the writing andpainting paper can be si