Waterborne potassium silicate zinc-rich primer capable of preventing easy cracking and applied to surface treatment of steel structure and preparation method of zinc-rich primer

Abstract

The invention discloses a waterborne potassium silicate zinc-rich primer capable of preventing easy cracking and applied to surface treatment of a steel structure. The zinc-rich primer is prepared from the following raw materials in parts by weight: 106-108 parts of flake zinc powder, 13-15 parts of potassium silicate, 6.4-7.4 parts of a styrene-acrylic emulsion, 1.4-1.6 parts of grape seed oil, 3.5-4.2 parts of amino propyl trimethoxy silane, 1.3-1.6 parts of terbium chloride, 6-8 parts of anti-crack fibers, 2-3 parts of paraffin, 9-10 parts of stainless steel powder, 0.8-1.2 parts of tallow amine, 2.4-2.7 parts of nano aluminum nitride, 0.3-0.5 part of boric acid and 24-26 parts of de-ionized water. According to the zinc-rich primer provided by the invention, the styrene-acrylic emulsion, which is modified by virtue of waterborne epoxy resin emulsion and the grape seed oil, is added to the raw materials and is combined with the potassium silicate solution, so that a binding agent is formed, the flask zinc powder, which is modified by virtue of silane doped rare earth, is taken as a pigment, and other effective adjuvants are combined, so that the prepared zinc-rich primer has the advantages of being good in dispersibility, strong in film adsorbability, long in period of preventing corrosion and the like, and the zinc-rich primer cannot get cracked easily after being dried.

Description

technical field [0001] The invention relates to the technical field of zinc-rich coatings, in particular to a water-based potassium silicate zinc-rich primer for surface treatment of steel structures that is not easily cracked and a preparation method thereof. Background technique [0002] Zinc-rich primer is a type of anti-corrosion coating product that uses zinc powder with a sacrificial anode function as the main anti-rust pigment. It has a cathodic protection effect on steel substrates and has been widely used for ships, offshore oil production platforms, containers, docks, and gates for a long time. , storage tanks, pipelines and bridges, etc. protection. Currently commonly used mainly epoxy zinc-rich primers, alcohol-soluble inorganic zinc-rich primers and water-based inorganic zinc-rich primers. [0003] The water-based inorganic zinc-rich primer is a heavy-duty anti-corrosion coating with water as the solvent, silicate (including potassium silicate, sodium silicate,...

AI Technical Summary

Problems solved by technology

Inorganic substances have better electrical conductivity than organic substances, so zinc powder has a stronger cathodic protection effect. The corrosion resistance of water-based inorganic zinc-rich primers is far superior to organic zinc-rich coatings, but it also has the common problems of inorganic coatings, such as coating film Brittle and easy to crack, poor adhesion, poor decorative effect, etc., and organic materials have better flexibility after film formation, so some water-soluble emulsion can be added to the water-based inorganic zinc-rich primer as auxiliary film-forming material to make organic matter Fill in the "-Si-O-Si-" network structure to improve the flexibility of the coating. For example, the literature "Research on the Modification of Zinc-rich Coatings by Styrene-Acrylic Emulsion" prepared styrene-acrylic emulsion as a modifier. A kind of waterborne inorganic zinc-rich paint modified by styrene-acrylic emulsion

[0004] However, the literature only introduces the amount of styrene-acrylic emulsion added and the flexibility of the coating. With the continuous optimization of the production process and formula, it is found that the scale-shaped zinc powder is better than the spherical zinc powder in terms of covering ability, floating ability and shielding ability. The advantages are outstanding, so the scaly zinc powder has gradually become the preferred filler for zinc-rich coatings, but its activity is too strong in water-based inorganic silicate alkaline coatings, poor anti-sedimentation, and easy to agglomerate, resulting in rapid failure of the coating and uneven surface. To a certain extent, the application of coatings is limited

Therefore, it is an urgent problem to be solved at this stage to study a new multifunctional water-based inorganic zinc-rich anti-corrosion primer formula that can overcome the problems of easy sedimentation and poor dispersibility of zinc powder.