Waterborne potassium silicate zinc-rich primer for surface treatment of moisture-resistant steel structure and preparation method of waterborne potassium silicate zinc-rich primer

Abstract

The invention discloses waterborne potassium silicate zinc-rich primer for surface treatment of a moisture-resistant steel structure. The primer is prepared from, by weight, 103-108 parts of flake zinc powder, 13-16 parts of potassium silicate, 9-10 parts of styrene-acrylic emulsion, 1.2-1.6 parts of vinyl silicone oil, 6-7 parts of carbon nanofibers, 2.3-3.1 parts of methyltriacetoxysilane, 1.2-1.4 parts of ytterbium nitrate, 6-8 parts of graphite powder, 0.7-0.9 part of sodium laurylsulfate, 1.7-1.9 parts of neopentyl glycol, 0.8-0.9 part of calcium gluconate and 23-26 parts of deionized water. After being modified with vinyl silicone oil, the styrene-acrylic emulsion is added into the raw materials to be compounded with a potassium silicate solution, silane is doped with rare earth so as to together modify the flake zinc powder, and then other effective adjuvant agents are compounded to prepare the zinc-rich primer. The zinc-rich primer is self-dried quickly, a cured coating has moisture resistance, the zinc-rich primer has electrowelding cutting resistance and chemical corrosion resistance, and the high bonding strength of the zinc-rich primer is suitable for various construction steel structures as the heavy-duty anticorrosive primer.

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 moisture-resistant 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, lithium...

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.