Waterborne rust conversion varnish and preparation method

Abstract

The invention belongs to the technical field of anticorrosive paints, and provides a waterborne rust conversion varnish and a preparation method. A waterborne composite resin emulsion system is used as a film forming matter, the coating can wet and penetrate into a dust layer of the whole steel surface through the effect of a penetrating agent, and a dust converting agent reacts with rust iron oxide formed on the surface of steel to form a stable macromolecule organic resin-iron complex, so that a dust layer binds to form a continuous closed coating layer, and the shield anti-corrosion protection effect is achieved. The coating has the certain anti-corrosion performance, and has the good matching property with other anti-corrosion coatings; by the adoption of the dust conversion varnish, construction strength and difficulty can be lowered, the labor cost is reduced, environmental pollution is reduced, construction environment is kept clean, and long-acting anti-corrosion protection is achieved for steel base materials.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion coatings, and provides a water-based rust conversion varnish and a preparation method thereof. In particular, it relates to a varnish which can be directly used for rust transformation of corroded steel materials, and the varnish has good rust transformation and antirust properties. Background technique [0002] Most traditional anti-corrosion coatings for steel structures use solvent-based coatings, which are commonly referred to as "paints". Solvent-based coatings will use a large amount of organic solvents in the process of production and use, which will cause huge pollution to the environment. Therefore, on February 1, 2015, the country officially proposed the concept of "paint consumption tax" to limit the use of solvents. The use of type coatings promotes the development of non-solvent types such as water-based coatings, UV coatings, powder coatings and high-solid coatings. [0003] ...

AI Technical Summary

Problems solved by technology

At present, the rusty coating resins used are divided into solvent-based resins and water-based resins. During the production and use of rusty coatings that use organic matter as solvents or dispersion media, a large amount of organic solvents are used, which will cause huge energy waste and environmental pollution. , the collection of paint consumption tax is to limit the use of solvent-based paint

[0005] In the invention patent CN101698776B, a kind of oily alkyd resin is announced as a film-forming substance with rusty paint for oil well pipes. Although the paint can be directly brushed on oil well pipes within 30 microns of the rust layer, there is an excessive amount of volatile organic solvents. The problem of polluting the environment

Epoxy resins, phenolic resins, alkyd resins, acrylic resins, polyurethane resins, and styrene-acrylic emulsions are often used as film-forming resins for water-based rusty coatings, but a single resin has some properties such as adhesion, weather resistance, permeability, and corrosion resistance. Insufficient performance

Invention patent CN102816486A discloses an acrylic zinc phosphate composite ceramic anti-corrosion coating. Only when the pretreatment of the steel base material reaches the international standard manual derusting St2 level, the formed coating has good wear resistance, corrosion resistance, and impact resistance. Performance such as safety, did not solve the problem of reducing construction costs well

[0006] In order to improve the deficiencies of the prior art, the present invention has developed a water-based composite resin emulsion, which can penetrate deeply into the extremely fine gaps of rust, convert harmful rust into complex solids through the action of a rust converting agent, and have a good bond with steel substrates Strong binding force, which solves the problems of insufficient adhesion, insufficient resin permeability and poor rust conversion ability of current water-based rust coatings

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