Filler dispersing agent matched with alcohol-soluble ink and preparation method of filler dispersing agent

The invention belongs to the field of auxiliaries, and particularly relates to a filler dispersant matched with alcohol-soluble ink and a preparation method of the filler dispersant. The preparation method comprises the following steps: mixing polyether and phosphide to obtain a premix; heating the premix, and then adding an acidifying agent for reaction to obtain a reactant; and sequentially cooling, filtering, discharging and packaging reactants. The dispersant is prepared from polyether, phosphide and an acidifying agent under strict operation conditions, the high-level dispersion and viscosity reduction capabilities of alcohol-soluble ink using organic and inorganic fillers at the same time are improved, and the wetting dispersant used for solvent-type and solventless coatings and printing ink can stabilize the organic and inorganic fillers and improve the viscosity reduction performance of the alcohol-soluble ink. Especially titanium dioxide and silicon dioxide, the viscosity of the abrasive can be remar