Surface-modified microcrystalline cellulose and preparation method thereof

The invention discloses surface-modified microcrystalline cellulose and a preparation method thereof, and belongs to the field of adjuvant preparation. The preparation method includes the steps that an inorganic acid solution is prepared for use; plant fiber is cut into proper dices for use; the inorganic acid solution is added into a reaction device, stirring is started, the plant fiber is put in and continuously stirred, a heating system is started to heat the solution till the solution nearly boils, and a heat preservation reaction is performed for certain time; a product formed after the reaction is filtered, and a filter cake is washed till the washing water is nearly neutral; pure water is added into a mixing device, stirring is started, polyethylene glycol is put in and stirred for 30 min, the materials are added into the mixing device, stirring continues to be performed for 60 min, and white uniform slurry is obtained; spray drying equipment is started for spray drying, and then the surface-modified microcrystalline cellulose product is obtained. The technology is simple, large-scale production is easy, and the obtained product is good in redispersibility and can be evenly dispersed in water more easily; the product is not likely to produce static and is better in formability.