Single-walled carbon nanotube reinforced epoxy zinc rich primer and preparation method thereof

Abstract

The invention discloses a single-walled carbon nanotube reinforced epoxy zinc rich primer and a preparation method thereof. The single-walled carbon nanotube reinforced epoxy zinc rich primer comprises the following raw materials: epoxy resins, zinc powder, single-walled carbon nanotubes, additives, polyamide and an organic solvent. The preparation method comprises the following steps: preparing adissolving solution from the epoxy resins; uniformly mixing the first part of epoxy resin dissolving solution with a wetting dispersing agent, a second part of organic solvent, a flexibilizer and ananti-settling thixotropic agent, adding the single-walled carbon nanotubes, and shearing and dispersing uniformly at a high speed; adding the zinc powder to be uniformly dispersed at a high speed, andfinally adding a reinforcing agent to be blended into base stock; uniformly mixing the polyamide and the third part of organic solvent, dropwise adding the second part of epoxy resin dissolving solution, and finally adding an accelerant to be uniformly mixed, and blending into a curing agent. The construction method comprises the following steps: mixing the base stock and the curing agent, uniformly stirring, and performing application coating. According to the single-walled carbon nanotube reinforced epoxy zinc rich primer disclosed by the invention, the usage amount of the zinc powder is reduced, the specific gravity of the paint is reduced, the coating rate of the paint is increased, the salt-fog resistance index is greatly enhanced, and the cathode protection function is effectively improved.

Description

technical field [0001] The invention relates to the field of coating paints, in particular to a single-wall carbon nanotube reinforced epoxy zinc-rich primer and a preparation method thereof. Background technique [0002] Epoxy zinc-rich primer has good mechanical properties, cathodic protection performance, and construction performance. It is one of the most commonly used paints in the current international heavy-duty anti-corrosion coating system. It can effectively protect steel structures from corrosion. Its anti-corrosion effect is achieved by sacrificing Zinc powder to achieve, its anti-corrosion mechanism can be summarized as: [0003] The carbon electrode potential (0.02-0.3V) in steel is higher than that of iron. When corrosion occurs, Fe loses electrons as an anode and transforms into Fe2+. Zinc powder is a highly chemically active pigment, and the potential of metal zinc (Zn, -0.762V) is lower than that of iron. Iron, zinc particles are in close contact with the ...

AI Technical Summary

Problems solved by technology

The Chinese chemical industry standard HG / T3668-2009 has clear regulations on the metal zinc content and salt spray resistance indicators in epoxy zinc-rich primers, respectively, metal zinc ≥ 80%, salt spray resistance ≥ 200h, metal zinc ≥ 70% , salt spray resistance ≥ 400h, metal zinc ≥ 80%, salt spray resistance ≥ 600h three categories, obviously, the higher the zinc powder content, the better the salt spray resistance and cathodic protection effect, but the high zinc powder addition, low utilization rate, thick The coating is easy to crack and blisters during corrosion are the inherent defects of traditional epoxy zinc-rich primers. At present, metal zinc resources are becoming more and more scarce, the pressure of environmental protection and people's higher requirements for anti-corrosion performance, traditional environmental protection Oxygen zinc-rich primer has no better breakthrough in the development of the industry, and the application of single-walled carbon nanotubes has brought a new upgrade to epoxy zinc-rich products