Water-based paint anti-settling agent and preparation method thereof

The invention belongs to the field of coatings, and particularly relates to a water-based coating anti-settling agent and a preparation method thereof. The preparation method comprises the following steps: mixing diisocyanate, polyethylene glycol monobutyl ether with an amphiphilic structure and highly hydrophilic polyethylene glycol monomethyl ether, stirring at a first temperature, raising the temperature to a second temperature, continuously stirring, and reacting to obtain an isocyanate-terminated prepolymer; and mixing and stirring the isocyanate-terminated prepolymer with a strong polar solvent and lithium chloride, and after the system is homogenized, adding polyamine for reaction to obtain the water-based paint anti-settling agent. The anti-settling agent synthesized from polyethylene glycol monobutyl ether with an amphiphilic structure, polyethylene glycol monomethyl ether with strong hydrophilicity, diisocyanate, polyamine, lithium chloride and a strong polar solvent is small in molecular weight. Th