Waterborne epoxy zinc-rich primer, preparation method and application thereof

Abstract

The present application belongs to the technical field of epoxy primer, and particularly relates to a water-based epoxy zinc-rich primer, a preparation method and application thereof. The water-based epoxy zinc-rich primer is prepared by using non-continuous point-like silica modified composite zinc powder as a cathodic protection functional filler, using modified epoxy resin as a film-forming base material, and combining with a modified aminoethyl piperazine curing agent, and has long-term cathodic protection performance and excellent hydrolysis resistance. The composite zinc powder is constructed by spherical and flaky zinc powder to form a continuous conductive network and a physical anti-settling structure. A point-like passivation layer formed by mild activation of glycolic acid and targeted adsorption of acidic silica sol can close the high active sites of zinc powder while ensuring electron conduction. The modified epoxy resin has self-emulsifying dispersibility and zinc powder coordination stability. The curing agent realizes water-based adaptation and storage stability through epoxy addition and reversible capping. After construction and unsealing, the curing agent can form a dense cross-linked paint film with the epoxy resin, thereby improving the long-term corrosion protection service performance of the primer.

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