An environment-friendly two-component waterborne epoxy zinc-rich special coating composition and its preparation method

Abstract

The invention relates to a heavy-duty anti-corrosion coating applied to railways, bridges and ocean engineering, specifically an environment-friendly two-component water-based epoxy zinc-rich special coating composition and a construction method thereof. The two-component water-based epoxy zinc-rich Zinc primer, including water-based epoxy zinc-rich A component and water-based epoxy zinc-rich B component, using a specific ratio of American Hemings company MPA60X rheological agent, PEDOT and Shanghai Ito company T‑250 fatty acid anti-settling Mixed with anti-settling agent, no need to use neutralizing agent, while having good anti-settling and anti-sag effects, it reduces the influence of anti-settling agent on the anti-corrosion effect of the coating composition, and has good construction performance and long-term anti-corrosion performance. It can be stored for a long time without change, will not produce air bubbles and will not agglomerate on the surface; no organic solvents are added to the composition, no pollution to the environment, convenient construction, and harmless to the health of construction workers.

Description

technical field [0001] The invention relates to the field of heavy-duty anti-corrosion coatings in roads, bridges, high-speed rails and ocean engineering, in particular to an environment-friendly two-component water-based epoxy zinc-rich special coating and a preparation method thereof. Background technique [0002] Heavy-duty anti-corrosion coatings are widely used in marine engineering, transportation vehicles, roads and bridges, large venues, ships, petrochemicals, high-speed rail facilities, heavy machinery and wind power equipment, which are mainly steel structures and equipment. Zinc-rich primer is currently It is one of the most widely used and most used types of heavy-duty anti-corrosion coating materials. It has strong corrosion resistance and weather resistance, and can effectively reduce the corrosion of metals. [0003] The standard electrode potential of zinc is -0.76V, and that of iron is -0.44V; zinc is more active than iron. The zinc content in the zinc-rich...

AI Technical Summary

Problems solved by technology

[0015] It has been found in engineering practice that although the addition of anti-settling agents, rheological agents and thixotropic agents has improved the problems of settlement and sagging, it has also had a certain impact on the protection of the steel surface by zinc powder. Domestically produced fatty acid amide anti-settling agents Due to its stable performance and low price, it is an anti-settling agent that is widely used in engineering at present. However, when using fatty acid amide anti-settling agents, after long-term exposure to the natural environment, it will be damaged on protrusions, depressions, and corners. Or there are blisters or even obvious red rust on the corners

The reason is that in the same construction process, the rheological properties of the folded edges, corners and edges of the coated steel become poor. According to the analysis, the accumulation of rheological agents and sedimentation agents is easy to occur in these parts. There are more charged amine groups in the amide, which affects the formation of the potential difference between the coating and the steel, thereby weakening the cathodic protection of the zinc powder, which makes the protrusions, depressions and edges of the steel material The neutral salt spray resistance and salt water resistance of corners or corners are deteriorated

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