Compound water-based inorganic anticorrosive paint and preparation method

Abstract

The invention relates to an anticorrosive paint, particularly to a compound water-based inorganic anticorrosive paint with the functions of cathode protection and anti-static electricity and a preparation method. The compound water-based inorganic anticorrosive paint comprises the following components in mass percent: 0.1-4% of oxidized graphene, 22-34% of zinc powder, 1-3% of attapulgite AT, 15-18% of potassium silicate, 11% of iron oxide red, 30-45% of distilled water and 0.2-0.8% of sodium polyacrylate. The anticorrosive paint has the characteristics that oxidized graphene and zinc powder are used as the main raw materials of the anticorrosive paint, the use amount of zinc powder is greatly reduced, the electrical conductivity and hardness of the paint are improved, the technology is simple, the anticorrosive paint is green, environment-friendly and good in corrosion resistance, and can be applicable to anticorrosive painting of various metal pipelines and metal members.

Description

technical field [0001] The invention relates to an anti-corrosion coating, in particular to an anti-corrosion coating with anti-static and anti-static effects [0002] Composite water-based inorganic anti-corrosion paint and preparation method thereof. technical background [0003] Zinc-rich paint is a kind of anti-corrosion paint with cathodic protection. The content of zinc powder in zinc-rich paint is very high, up to 90% (weight ratio), so that between the zinc powder particles in the dry film, zinc powder and steel The substrates are in contact with each other. In this state, when moisture penetrates into the paint film, a micro-battery is formed between the zinc powder and the steel substrate, because zinc is a more active metal than iron in electrochemistry (potential low), so the anti-corrosion current flows from the zinc powder to the steel, thereby playing a cathodic protection effect on the steel. [0004] There are still many problems in the current zinc-rich c...

AI Technical Summary

Problems solved by technology

[0004] There are still many problems in the current zinc-rich coatings. Generally, organic coatings have poor weather resistance and heat resistance, low mechanical strength, easy aging, and low electrical conductivity. It is not conducive to cathodic protection; solvent-based coatings have high VOC content, and when the coating film dries, a large amount of flammable, explosive and toxic organic gases will be volatilized, which will cause great harm to the human body, high safety hazards, and large environmental pollution; water-based coatings are generally the future development However, in practical application, there are still many problems, such as long drying time, high requirements on ambient temperature and humidity, poor adhesion to steel, easy to cause peeling off, etc.; the existing problems of inorganic zinc-rich coatings are mainly Focus on the research on its supporting additives, especially the high modulus silicate zinc-rich coating has very outstanding anti-corrosion performance, and can be applied to a variety of complex environments, but it is easy to settle when stored, and the viscosity is high and easy to gel. These are issues that need to be resolved

[0005]Theoretically speaking, the higher the zinc powder content, the better the cathodic protection effect; however, in actual engineering, due to the different corrosion environments, the expected effect is often not achieved. For example, in places with severe water wetting, the dissolution of zinc powder in the coating film is relatively severe. At this time, the content of zinc powder is too high to cause blisters in the paint film. Therefore, the content of zinc powder in application should not be too high, generally not higher than 70% , which greatly affects the effect of cathodic protection