Aqueous rusted anti-corrosive coating and preparation method thereof

Abstract

The invention provides an aqueous rusted anti-corrosive coating and a preparation method thereof, belonging to the technical field of anti-corrosive coatings of steel and iron surfaces. The coating consists of the following raw materials in percentage by mass: 20-30 percent of iron rust transforming agent, 50-60 percent of composite high molecular emulsion, 0.01-0.2 percent of penetrating agent, 0.1-0.5 percent of film forming aid, 0.01-0.2 percent of thickening dispersant and 10-20 percent of deionized water. The aqueous rusted anti-corrosive coating prepared with the preparation method can be directly applied to coating of rusty steel and has high performance. The provided preparation method has the advantages of simple preparation process and low cost.

Description

Technical field: [0001] The invention belongs to the technical field of anti-corrosion coating on steel surfaces, and in particular relates to a water-based anti-corrosion coating with rust directly used on corroded steel and a preparation method thereof. Background technique: [0002] According to statistics, metals rusted due to corrosion account for more than 20% of the annual output in the world every year, and the resulting economic losses are about 100 billion U.S. dollars. The annual domestic economic loss due to corrosion accounts for about 4% of the gross national product. In order to protect steel from corrosion and prolong its service life, anti-corrosion coating on steel has become the most economical and effective method. In order to obtain excellent corrosion resistance, the rust on the steel must be removed before painting, otherwise the paint film and anti-corrosion effect will be poor due to the continuous expansion of the rust. Therefore, the rust removal t...

AI Technical Summary

Problems solved by technology

At present, the anticorrosion of domestic steel structures still uses the old process of painting after sandblasting. Although the anticorrosion effect is good, there are also complex structural parts with dead angles, high power consumption, dust pollution, noise pollution, and cost in sandblasting and shot blasting processes. High and many shortcomings, so it is very necessary to prepare a rusty coating that can be directly applied on the rusty surface

[0003] At present, there are mainly two types of rusty coatings: solvent-based and water-soluble. Oily rusty coatings that use organic matter as a solvent or dispersion medium, because volatile organic matter is easy to pollute the environment, consumes a lot of energy, and is highly toxic. It is unsafe and the rust conversion is not complete.

For example, the invention patent CN101760109A discloses a kind of two-component solvent-based rusty primer with epoxy resin and phenolic resin as the film-forming material. Although it solves the direct coating of the thin rust surface, there are still problems such as solvent pollution of the construction environment.

Water-based rust coatings are mainly prepared with phosphoric acid, tannic acid and other systems, which have the disadvantages of poor compatibility and stability with film-forming substances, easy to cause local over-corrosion, poor film adhesion and uniformity, etc. Water-based rust coatings Compared with solvent-based coatings, there is still a certain gap in the coating film performance, so it is difficult to quickly popularize and apply

For example, the invention patent CN1264754A uses phosphoric acid and organic acids, catalysts, corrosion inhibitors, active agents, penetrants and alloy powders to prepare water-based rust conversion agents, which solves the problems of water-based rusty coatings and construction pollution, and the water resistance of the coating film and The binding force with the outer coating film is poor, and the conversion speed and degree of rust still need to be strengthened

In order to overcome the deficiencies in the prior art, the present invention has developed a fast rust conversion agent, and synthesized a special polymer composite emulsion, which has good compatibility and stability with the rust conversion agent, and solves the problem of the film formation of the current water-based rust coating The uniformity of the coating, easy whitening of the coating film, and poor rust conversion ability

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