Preparation method of aqueous inorganic zinc-rich anticorrosive coating

Abstract

The invention relates to a preparation method of an aqueous inorganic zinc-rich anticorrosive coating. The aqueous inorganic zinc-rich anticorrosive coating comprises a film forming base liquid, a binder and spherical high-purity zinc dust with particle sizes of 400 meshes. The film forming base liquid is a sodium silicate solution treated by an inorganic acid. The binder is a lithium silicate binder. The binder contains polyvinyl alcohol as an auxiliary agent and the mass of the used polyvinyl alcohol is 25-40wt% of the binder mass. The preparation method has simple processes. The aqueous inorganic zinc-rich anticorrosive coating is convenient for coating, is environmentally friendly and nontoxic, has safety and can be cured to form a film at the normal temperature in short time. In an inorganic zinc-rich anticorrosion paint performance evaluation test, after observation for 1440h, the aqueous inorganic zinc-rich anticorrosive coating prevents dust and coating falling off so that it is proved that the aqueous inorganic zinc-rich anticorrosive coating has high coating adhesion, impact resistance, salt mist resistance and flexible performances.

Description

technical field [0001] The invention relates to a preparation method of a water-based inorganic zinc-rich anticorrosion coating, which belongs to the field of inorganic zinc powder anticorrosion coatings. Background technique [0002] Water-based inorganic zinc-rich anti-corrosion coatings are generally based on inorganic silicate (sodium, potassium, lithium) and high-purity inorganic zinc powder as filler to make a two-component water-based inorganic zinc-rich coating. The protective effect of the coating on the base steel is divided into two stages: the first stage is the anodic protection stage, and the zinc powder particles protect the base steel by providing a protective current; the second stage is the barrier protection stage of the coating, which is It is caused by the clogging of the pores in the coating by the corrosion products of zinc powder. Water-based inorganic zinc-rich anti-corrosion coatings have a development history of more than 50 years and have good ...

AI Technical Summary

Problems solved by technology

[0011] 1. The zinc content in the coating of water-based inorganic zinc-rich anti-corrosion coating exceeds 70%, and the coating is relatively "brittle" and has poor impact resistance;

[0012] 2. The coating of inorganic zinc-rich primer is easy to crack, which will produce so-called cracked coating defects, etc.;