Water-based solvent-free epoxy anticorrosive coating and preparation method thereof

Abstract

The invention relates to the technical field of heavy corrosion prevention in petrochemicals, and in particular relates to a water-based solvent-free epoxy corrosion prevention coating used in the environment of heavy corrosion of the inner walls of crude oil and chemical storage tanks and a preparation method thereof. The water-based solvent-free epoxy corrosion prevention coating comprises the following components in percentage by weight: 30 to 50 percent of solvent-free aqueous epoxy resin, 1 to 10 percent of a reactive diluent, 40 to 55 percent of a pigment and 1 to 5 percent of an auxiliary agent, wherein the sum of the percentages of the components is 100 percent. In the invention, the solvent-free aqueous epoxy resin and a solvent-free aqueous epoxy curing agent are innovatively used as main film-forming substances, a small amount of hydrophilic groups are introduced into the molecular structure of the resin and the curing agent, and the hydrophilic reactive diluent is added inthe design of the coating to reduce the viscosity of the product. The product itself has the characteristics of low viscosity, no solvent and excellent corrosion resistance. At the same time, due to the introduction of hydrophilic groups into the molecular structure, the product can be dissolved in water.

Description

technical field [0001] The invention relates to the technical field of heavy-duty anti-corrosion of CNPC, in particular to a water-based solvent-free epoxy anti-corrosion coating used in the severe corrosion environment of the inner wall of crude oil and chemical storage tanks and a preparation method thereof. Background technique [0002] Epoxy resin coatings have the advantages of strong adhesion, high hardness, wear resistance, salt spray resistance, acid and alkali resistance, high solid content, and high fullness. Therefore, it is widely used as industrial heavy-duty anti-corrosion coatings, anti-rust primers, oil tank coatings, drinking water tank coatings, etc. [0003] Due to the high viscosity of epoxy resin itself, it needs to be diluted with solvent to reduce the viscosity of the resin in order to prepare coating products. Therefore, conventional solvent-based epoxy coatings contain a large amount of organic solvents (VOC) in the system, and the VOC content usual...

AI Technical Summary

Problems solved by technology

Using conventional solvent-based coatings, basically 2-3 coats can achieve the specified thickness, while using the current commercially available water-based epoxy coatings requires at least 5-6 coats, which seriously affects the construction progress

In addition, since water-based paints have more hydrophilic groups, the anti-corrosion performance of the coating film is relatively inferior to that of oil-based paints. Therefore, there are few achievements in the field of heavy-duty anti-corrosion, especially in petrochemical storage tanks.

Images