Preparation method of organic silicon modified epoxy itaconate resin aqueous dispersion

The invention discloses an organic silicon modified epoxy itaconate resin aqueous dispersion and a preparation method thereof. The preparation method comprises the following steps: adding a certain amount of a Karstedt catalyst into an isopropanol solution of epoxy itaconate resin, conducting heating and stirring to 50-70 DEG C, slowly dropwise adding a certain amount of hydrogen-terminated polysiloxane, conducting heating to an isopropanol reflux temperature, continuing to react for 6-8 hours, and carrying out reduced pressure distillation to recover isopropanol, thereby obtaining the polysiloxane modified epoxy itaconate; and dissolving the polysiloxane modified epoxy itaconate in acetone, adding semi-blocked isocyanate according to the mass ratio of 1:1, conducting stirring and heating to the reflux temperature of the acetone, conducting reacting for 6-8 hours, conducting neutralizing with alkali, conducting dispersing with water, and conducting evaporating to remove the acetone, thereby obtaining the orga