Water-based potassium silicate zinc-enriched primer having fast drying and excellent heat insulation property and used for surface treatment of steel structures and preparation method thereof

Abstract

The invention discloses a water-based potassium silicate zinc-enriched primer having fast drying excellent heat insulation property and used for surface treatment of steel structures; the primer is prepared from the following raw materials in parts by weight: 105-108 parts of a flake zinc powder, 14-16 parts of potassium silicate, 1.4-1.8 parts of a water-based polyurethane emulsion, 5.5-6.5 parts of a styrene-acrylic emulsion, 4.1-4.6 parts of methyltriethoxysilane, 1.1-1.3 parts of praseodymium chloride, 5-7 parts of a brucite fiber, 2.2-2.5 parts of tin antimony oxide, 0.7-0.9 part of sodium lignosulfonate, 0.9-1.2 parts of aluminum oxide, 3.2-3.5 parts of dimethylethanolamine, 7-9 parts of sodium-based bentonite, and 23-25 parts of deionized water. The styrene-acrylic emulsion is modified by the water-based polyurethane emulsion and then is added to the raw materials to be composited with a potassium silicate solution, the flake zinc powder is co-modified by silane doped rare earths, then other effective auxiliary agents are matched, and thus the zinc-enriched primer is prepared; the zinc-enriched primer has the advantages of fast drying speed, good thermal insulation property and good early water resistance.

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 steel structure surface treatment with fast drying and excellent heat insulation performance 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 potassiu...

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.