Cellulose acetate particle aggregate, preparation method therefor and application thereof

A method for preparing a cellulose acetate particle aggregate, comprising:

• (a) selecting cellulose acetate particles and a second kind of particles in a select ratio, or the cellulose acetate particles alone;
• (b) adding a binder thereto to prepare particle aggregates by an air fluidized granulation method;
• and
• (c) sieving the particle aggregates to obtain a cellulose acetate particle aggregate with a desired particle size;
• wherein:
• the preparation method yields a cellulose acetate particle aggregate comprising 49-99.5 wt % of the cellulose acetate particles, 0-50 wt % of the second kind of particles and 0.5-20 wt % of the binder;
• the cellulose acetate particles are obtained by:
• dissolving cellulose acetate in an organic solvent to obtain a cellulose acetate solution of a select concentration;
• with mechanical stirring at 250-450 rpm, adding an aqueous NaOH solution dropwise to the cellulose acetate solution to precipitate the cellulose acetate to obtain a white suspension;
• further stirring the suspension for a period of time to solidify the particles precipitated from the suspension;
• and
• suction filtering the suspension, washing the filtered particles with water and then drying the particles by centrifugal spray, thereby obtaining the cellulose acetate particles;
• and
• the organic solvent is acetone or a mixture of acetone and dimethyl sulfoxide, the acetyl value of the cellulose acetate is in the range of 40-62%, and the concentration of the aqueous NaOH solution is 0.05-1.0 mol/L.