Aqueous epoxy graphene anticorrosive paint

Abstract

The invention relates to the anticorrosive paint field, and specifically relates to a preparation method of a dual component aqueous epoxy graphene anticorrosive paint. An epoxy polyether addition product is used to emulsify epoxy resin to prepare epoxy resin emulsion. Amino polyether, polyamine, and epoxy resin carry out reactions to prepare a polyether modified epoxy amine addition product curing agent. The epoxy resin amine addition product, zinc powder, pigments, fillers, and graphene are used to prepare zinc powder slurry, which is taken as an A component. A silane coupling agent and silicate carry out hydrolysis to prepare silicate sol, the silicate sol and epoxy resin emulsion are mixed, and the mixture is taken as a B component. A proper amount of graphene is used to modify zinc powder slurry, silicate sol is used to modify epoxy emulsion, two modifications obviously improve the anticorrosive performance of an aqueous zinc enriched primer, a same anticorrosive effect is reached, and the using amount of zinc powder is largely reduced. The obtained aqueous primer has the advantages that the VOC content is low, the pollution of organic solvents and zinc powder to the environment is largely reduced, and the safety hazards and fire are eliminated. The storage stability of paint is good, the paint is safe and convenient for construction, the coating can be quickly dried, theadhesion force of coating is strong, and the anticorrosive performance is strong.

Description

technical field [0001] The invention relates to the field of water-based anti-corrosion coatings, in particular to a preparation method of an environment-friendly two-component water-based epoxy graphene zinc-rich anti-corrosion coating. Background technique [0002] Zinc-rich coatings rely on the electrochemical protection of zinc powder to protect steel substrates from corrosion and have excellent anti-corrosion effects. It is widely used in shipbuilding, container manufacturing, marine engineering, petrochemical storage tanks, steel structures, and bridge anticorrosion. Traditional zinc-rich primers mainly include solvent-based epoxy zinc-rich primers, alcohol-soluble inorganic zinc silicate primers, and water-based inorganic zinc-rich paints. The first two are solvent-based paints, and epoxy zinc-rich primers are widely used in container manufacturing and bridge anticorrosion. Alcohol-soluble inorganic zinc-rich primer is widely used in pre-coating of steel plates in s...

AI Technical Summary

Problems solved by technology

However, due to the extremely large specific surface area of ​​graphene, it is difficult to wet and disperse in aqueous solution. If good dispersion in coatings cannot be achieved, it will be difficult to exert the effect of graphene whether it is based on conductivity or shielding.

Moreover, due to the low surface energy characteristics of graphene, it is easy to enrich the surface, resulting in a decrease in coating adhesion.

[0004] In addition, in the primer, due to the good conductivity of graphene, when there are defects in the paint film, the graphene, metal substrate and electrolyte form a corrosion battery, which has the risk of accelerated corrosion

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