Water-based potassium silicate zinc-rich primer used for surface treatment of long-acting anti-microbial section steel structures and preparation method of water-based potassium silicate zinc-rich primer

Abstract

The invention discloses water-based potassium silicate zinc-rich primer used for surface treatment of long-acting anti-microbial section steel structures. The water-based potassium silicate zinc-rich primer is prepared from, by weight, 100-102 parts of scale zinc powder, 15-17 parts of potassium silicate, 1-2 parts of water-based epoxy resin emulsion, 6-8 parts of styrene-acrylic emulsion, 3-5 parts of methyltrimethoxysilane, 1.2-1.4 parts of ytterbium chloride, 4-6 parts of viscose, 2.1-2.3 parts of single-wall carbon nanotubes, 10-11 parts of potash feldspar powder, 6-8 parts of polyvinyl alcohol, 5-7 parts of chitosan, 0.4-0.7 part of ferrocene and 21-23 parts of deionized water. The zinc-rich primer prepared by adding the styrene-acrylic emulsion in the raw materials after the styrene-acrylic emulsion is modified through the water-based epoxy resin emulsion, compositing the styrene-acrylic emulsion and a potassium silicate solution to be used as a binding agent, using the scale zinc powder modified by doped silence and rare earth together as pigment and combining other valid auxiliaries has the beneficial effects of being antimicrobial, resistant to corrosion, resistant to water, and the like and is suitable for steel long-acting corrosion-resistant coating projects, and the corrosion prevention service life can reach 50 years.

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 long-acting antibacterial steel structures 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.