Coating process for preparing waterborne heavy corrosion protection coating based on single-way thick film technology

Abstract

The invention provides a coating process for preparing a waterborne heavy corrosion protection coating based on the single-way thick film technology. The high-pressure no-air manner is adopted to spray a corrosion protection coating with the solid content in volume being 80% or above, accordingly, in the process, the content of solvent water is reduced, the water volatilization amount in the paint film drying process is reduced, the thickness and the coating compactness of a single-way spraying construction coating dry film are improved, the coating combination strength is improved, the single-way construction coating dry film with the thickness ranging from 150 micrometers to 200 micrometers can be manufactured, only through single-way coating, the corrosion protection capacity, with 10 years or above, of the coating in the industrial or coastal regions with the brinishness can be achieved, and compared with multi-way coating process in the prior art, the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of coating, in particular to a coating process for preparing a water-based heavy-duty anti-corrosion coating based on a single-pass thick film technology. Background technique [0002] The use environment of large-scale steel structures is generally relatively harsh, coupled with their high value and long service life, so they have high requirements for corrosion resistance and weather resistance. In the prior art, by spraying the surface of the large-scale steel structure, its anti-corrosion performance can be enhanced, thereby increasing its service life. The traditional coating method is painted with solvent-based coatings. The volatile organic compounds (VOC) emitted in the industrial coating production of solvent-based coatings have the characteristics of high VOC content, high chemical toxicity, high pollution, flammability and explosion. , has multiple hazards to humans and the environment. Long-ter...

AI Technical Summary

Problems solved by technology

Although this method meets the quality requirements of coating, it is only suitable for metal components with small components and relatively simple structures, and is not suitable for anti-corrosion treatment of large steel structural parts. It must be painted indoors and the ambient temperature must be strictly controlled. , humidity and other conditions, it requires multiple layers of coating construction, each layer of high temperature heating and drying, the process is more complicated

[0006] Chinese patent document 2 (CN104289406A) also discloses a water-based paint coating process for railway wagons, which adopts multiple spraying constructions, and each film thickness is no more than 30 μm. Although it can be dried at normal temperature, it requires multiple sprayings Construction, the construction process is complicated, multi-pass spraying greatly reduces the construction efficiency, and the formed coating is only suitable for general anti-corrosion fields

However, it also requires the combination of primer and topcoat to achieve the required anti-corrosion effect, and the construction temperature must be 5 degrees above zero. The process is relatively complicated and has high environmental requirements, so it is not suitable for winter use.

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