A long-acting anti-corrosion water-based cold zinc coating and preparation method thereof

Abstract

The invention belongs to the technical field of anti-corrosion coatings, and in particular relates to a long-acting anti-corrosion water-based cold-coated zinc coating and a preparation method thereof. The long-acting anti-corrosion water-based cold-coated zinc coating consists of the following components in weight percentage: water-based acrylic resin 5 ‑15%, zinc powder 75‑90%, silane coupling agent 0.5‑3%, thickener 1‑5%, water balance. The resin that the present invention adopts is waterborne acrylic resin, and solvent is water, does not contain VOC, meets environmental protection requirement; The silane coupling agent that the present invention adopts is the diaminosilane coupling agent that contains two primary amino groups, not only helps Form chemical bonds on the surface of zinc powder, form a firm coating, improve the dispersion and surface activity of zinc powder particles, improve the physics, chemistry, mechanics, etc. of the surface of zinc powder particles, and help form hydrogen bonds on the surface of steel substrates Focus, and because the diaminosilane coupling agent contains two primary amino groups, a small amount of addition can achieve a good improvement effect.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and in particular relates to a long-acting anti-corrosion water-based cold zinc coating and a preparation method thereof. Background technique [0002] The traditional anti-corrosion method of steel is usually hot-dip galvanized or hot-sprayed zinc on the surface of the steel, but these two methods also have many disadvantages: (1) Because hot-dip galvanized or hot-sprayed zinc is carried out at high temperature, it is easy to heat the workpiece Deformation makes installation difficult; (2) Many large components cannot be galvanized, and many construction sites cannot be galvanized due to conditions; (3) Hot-dip galvanizing or hot-spray galvanizing requires heating and melting of metal zinc, which consumes a lot of energy (4) both methods will produce a large amount of three wastes, which seriously pollute the environment; (5) the damage to the zinc layer caused by installation, t...

AI Technical Summary

Problems solved by technology

[0002] The traditional anti-corrosion method of steel is usually hot-dip galvanized or hot-sprayed zinc on the surface of the steel, but these two methods also have many disadvantages: (1) Because hot-dip galvanized or hot-sprayed zinc is carried out at high temperature, it is easy to heat the workpiece Deformation makes installation difficult; (2) Many large components cannot be galvanized, and many construction sites cannot be galvanized due to conditions; (3) Hot-dip galvanizing or hot-spray galvanizing requires heating and melting of metal zinc, which consumes a lot of energy (4) both methods will produce a large amount of three wastes, which seriously pollute the environment; (5) the damage to the zinc layer caused by installation, transportation, welding, etc. cannot be effectively repaired, thereby affecting the overall anticorrosion life, causing potential safety hazards, and There are problems such as color difference

However, the high content of volatile organic solvents in traditional solvent-based cold-coated zinc coatings not only seriously pollutes the environment, but also has adverse effects on the health of construction workers.

[0004] Chinese patent document CN108948898A discloses a low surface treatment cold-sprayed zinc coating and a preparation method thereof. The cold-sprayed zinc coating comprises 0.1-5.0 parts of graphene oxide n-butyl acetate dispersion, 2-20 parts of acrylic resin, silane coupling 0.1-2 parts of plasticizer, 0.1-2 parts of plasticizer, 0.1-3 parts of anti-settling agent, 10-50 parts of spherical zinc powder, 10-50 parts of flake zinc powder, 1-10 parts of mixed alcohol silica sol, although the Cold-sprayed zinc coating reduces the VOC content to less than 200g / L, but it still causes great pollution to the environment, and the zinc content in the dry film only reaches more than 90%. The neutral salt spray time is 1000h, and the anti-corrosion performance needs to be further improved

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