A kind of nanometer anti-corrosion coating for the metal surface under acid-related environment and preparation method thereof

Abstract

The invention relates to a metal surface anticorrosion nano-coating for acid environments and a preparation method of the nano-coating, and belongs to the technical field of anticorrosion coatings. The anticorrosion nano-coating comprises a main agent, a curing agent and a diluent and is characterized in that the weight ratio of the main agent to the curing agent is 100:(15-50), the main agent comprises modified phenolic resin, modified epoxy resin with an IPN (interpenetrating polymer network) structure, nano-titanium dioxide, carbon black, barium sulfate, talcum powder, flaky mica powder, nano-aluminum oxide, nano-silicon carbide, polyaniline, rare earth materials, modified zinc phosphate, organic siloxane surface modification agents, wetting dispersing agents, defoaming agents, anti-settling agents, anti-sagging agents, dimethylbenzene and butyl alcohol, the curing agent comprises modified amine and dimethylbenzene, and the diluent comprises dimethylbenzene and butyl alcohol. The anticorrosion nano-coating has excellent acid resistance, corrosion resistance and adhesive force, and the preparation method of the nano-coating is simple, easy to operate, low in device requirement and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and in particular relates to a nano-anti-corrosion coating for metal surfaces in an acid-related environment and a preparation method thereof. Background technique [0002] Acid corrosion is a common type of corrosion. Acid corrosion widely exists in acid-producing chemical equipment (such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, etc.), oil and gas field production environment (containing H 2 S, CO 2 Acid gas, etc.), acid rain atmospheric environment (existing SO 2 , NO 2 etc.) and acid-related environments such as acidic soil. Acidic corrosion mainly exists in two forms of hydrogen evolution corrosion and oxidation corrosion, and its corrosion to metal materials and equipment is very serious, which brings serious troubles to the storage and production of materials, products and equipment. Therefore, it is one of the hot spots and difficulties in the ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from a comprehensive analysis that the above-mentioned published patents on acid-resistant coatings have certain practical prospects, but there are also one or more of the following problems: (1) These two resins, epoxy and phenolic resins, have their own advantages and disadvantages. It is difficult to use alone under the conditions

For example, epoxy resin has very stable C-C bonds and ether bonds, good chemical stability, and can resist alkali corrosion. At the same time, there are very polar epoxy groups and hydroxyl groups in the structure, which have excellent adhesion to metal substrates. Focus on forming a coating with high hardness, good wear resistance and low volume shrinkage, but it can only resist dilute acid, poor heat resistance, and can only be used below 100 °C

The acid resistance and heat resistance of phenolic resin are better than epoxy resin, but its flexibility is deviated after film formation, and the coating is easy to be brittle

Therefore, the two must be chemically modified or blended to give full play to their advantages and overcome their disadvantages. However, some acid-resistant coating patents still have the problem of using unmodified single resin as the main film-forming substance; (2) although Most patents pay attention to the acid resistance in the selection of pigments and fillers, but seldom pay attention to the nano-filling effect of pigments and fillers and the performance of corrosion inhibition and self-healing; Solvent coatings and powder coatings are developed in the direction of environmental protection

Powder coatings and water-based coatings also appear in acid-resistant coating patents, but the high construction conditions of powder coatings (such as special coating technology, heating and curing, etc.) will limit its use in equipment and facilities working in acidic environments; industrial There are still many insurmountable shortcomings in water-based coatings, which make it difficult to guarantee the performance of the coating, especially for the highly corrosive acidic environment; combined with the problems of these two types of coatings, and the fact that there is currently a lack of coatings available in acid-related environments , it seems more feasible to seriously develop usable high-performance solvent-borne acid-resistant coatings