A waterborne inorganic zinc-rich coating with high adhesion, high flexibility and anti-flash rust and its preparation method

Abstract

The invention discloses a high-adhesion high-flexibility flash-rust prevention water-borne inorganic zinc-rich coating and a preparation method thereof. The preparation method includes the steps: 1) adding 1-10 parts of silicone acrylic emulsion into 10-20 parts of silicate solution and sufficiently stirring the solution for 10-15 minutes to obtain silicate solution modified by the silicone acrylic emulsion; 2) adding 1-10 parts of tourmaline powder into 20-80 parts of zinc powder, sufficiently grinding the tourmaline powder and the zinc powder and uniformly mixing the tourmaline powder and the zinc powder to obtain mixed pigments; 3) adding the silicate solution into the mixed pigments, adding a small quantity of auxiliaries, and uniformly stirring and mixing the materials to obtain the high-adhesion high-flexibility flash-rust prevention water-borne inorganic zinc-rich coating. The high-adhesion high-flexibility flash-rust prevention water-borne inorganic zinc-rich coating solves theproblems of flash-rust and flash etching of the surface of a steel substrate due to water serving as a dispersion medium of a high-adhesion high-flexibility water-borne inorganic zinc-rich coating.

Description

technical field [0001] The invention belongs to the field of preparation of industrial heavy-duty anti-corrosion coatings, and in particular relates to a water-based inorganic zinc-rich coating with high adhesion, high flexibility, and anti-flash rust applied to steel structure anti-corrosion and a preparation method thereof. Background technique [0002] Water-based inorganic zinc-rich coatings are widely used in heavy-duty corrosion protection of steel structures. They have comprehensive properties such as low VOC emissions, excellent weather resistance, and low price. However, most of the water-based inorganic zinc-rich coatings currently on the market are made of alkali metal silicate aqueous solution or / and As a film-forming substance, silica sol is prepared with pigments, fillers and various additives. It has problems such as insufficient adhesion, poor flexibility, and easy flash rust. [0003] Chinese patent CN108727881A uses semi-continuous emulsion polymerization t...

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Problems solved by technology

[0002] Water-based inorganic zinc-rich coatings are widely used in heavy-duty corrosion protection of steel structures. They have comprehensive properties such as low VOC emissions, excellent weather resistance, and low price. However, most of the water-based inorganic zinc-rich coatings currently on the market are made of alkali metal silicate aqueous solution or / and As a film-forming substance, silica sol is prepared with pigments, fillers and various additives. It has problems such as insufficient adhesion, poor flexibility, and easy flash rust.

[0003] Chinese patent CN108727881A uses semi-continuous emulsion polymerization to synthesize a high-performance silicon-acrylic emulsion, which is added to an inorganic silicate solution and mixed with zinc powder to prepare a high-adhesion, high-flexibility zinc-rich coating, which effectively solves the problem of Solved the problems of poor adhesion and insufficient flexibility of water-based inorganic zinc-rich coatings

However, the main dispersion medium of water-based inorganic zinc-rich coatings is water, which is prone to flash rust and flash corrosion when in contact with steel substrates, seriously affecting its anti-corrosion performance

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