Water-based anti-corrosion paint and preparing method thereof

The invention discloses a water-based anti-corrosion paint and a preparing method thereof. The water-based anti-corrosion paint is prepared from lignosulfonate modified inorganic nanofiller, water-based epoxy resin, water-based curing agent and water. The preparing method includes the steps that according to the chemical characteristics of lignosulfonate, amidogen is introduced to the lignosulfonate through a Mannich reaction, then the lignosulfonate is grafted to the surface of inorganic nanofiller through the hydrogen-bond interaction, the obtained modified inorganic nanofiller is compounded with the water-based epoxy resin, and the water-based anti-corrosion paint is prepared. According to the preparing method, as the lignosulfonate is introduced, the surface tension and the interfacial tension of the water are effectively reduced, the problems that the inorganic nanofiller is prone to agglomeration and poor in dispersity in a water-based epoxy resin paint are remarkably solved, and the barrier performance