The invention provides
hydroxypropyl chitosan microspheres as well as a preparation method thereof and application thereof in reduction of
dielectric loss of
vegetable oil, belonging to the field of
chitosan modification. The preparation method of the
hydroxypropyl chitosan microspheres comprises the following steps: mixing
chitosan, having
viscosity of 0.25-0.65Pa.s with isopropanol and a first
sodium hydroxide solution, adding tetramethyl
ammonium hydroxide into the mixture, dropwise adding epoxypropane for carrying out a reaction, cooling and adjusting the pH value to 7, dispersing the product into
acetone or water, stirring and carrying out suction
filtration, washing with
anhydrous ethanol, and carrying out
vacuum drying to obtain
hydroxypropyl chitosan; preparing the hydroxypropyl
chitosan into a solution, spraying the solution onto
sodium polyphosphate, carrying out ultrasonic treatment and crosslinking, then washing with water, filtering, adding the product into a
sodium hydroxide solution and stirring, and adding
glutaraldehyde for carrying out a reaction so as to obtain microspheres; washing the microspheres with water, then leaching the microspheres respectively with organic solvents with volume percentages of 21-29%, 41-49%, 61-69% and 85-89%, and carrying out
freeze drying. The modified chitosan prepared by the method can reduce the
dielectric loss of the vegetableoil.