Metal corrosion has brought huge economic losses to countries around the world. According to data released by the United States, Japan, Canada and other countries, the direct economic losses caused by corrosion account for about 2.5% to 4.2% of the gross national product. It is estimated that the world About 20% of metal materials cannot be recycled due to corrosion, so the corrosion and protection of metals has attracted widespread attention from all over the world.

In China, the annual economic losses caused by metal corrosion account for about 4% of the gross national product, and the corrosion losses exceed the sum of fires, windstorms and earthquakes. For a long time, in order to reduce the loss of corrosion, many measures have been taken, such as electrochemical protection of metals, corrosive media treatment, cover protection, etc., but the most common, economical and practical protection measures to date have been coatings. protection.

Coating anti-corrosion is widely used because of its convenient construction, economical application, no restrictions on the site and certain decorative characteristics. At present, common metal surface coated anti-corrosion coatings are often solvent-based coatings, but VOCs and heavy metals in them pose serious environmental pollution problems, while the solvent is flammable and explosive, which brings safety to the environment. Hidden dangers. With the increasing awareness of environmental protection, waterborne coatings have become the main development direction in the coatings field.

The research of coatings should be oriented towards water-based, high solids differentiation, high performance and functionalization. Environmentally friendly coatings (or green coatings) are the common expectation. Among waterborne anticorrosive coatings, waterborne epoxy anticorrosive coatings have become the focus of research in waterborne coatings due to their outstanding corrosion resistance.