Metal corrosion has caused huge economic losses to countries around the world. According to data published by the United States, Japan, Canada and other countries, the direct economic loss caused by corrosion accounts for about 2.5% to 4.2% of the gross national economic output value. It is estimated that the world About 20% of metal materials cannot be recycled due to corrosion, so metal corrosion and protection issues have attracted widespread attention from countries around the world.
In my country, the annual economic loss caused by metal corrosion accounts for about 4% of the gross national product, and the corrosion loss exceeds the sum of fires, wind disasters, and earthquakes. For a long time, in order to reduce the loss of corrosion, many measures have been taken, such as the electrochemical protection method of metals, the treatment method of corrosive media, and the protection method of covering layer, etc., but by far the most common, economical, and practical protection measure is paint. protection.
Coating anticorrosion is widely used due to its convenient construction, economical application, no on-site restrictions and certain decorative features. At present, anti-corrosion coatings applied on ordinary metal surfaces often use solvent-based coatings, but VOCs and heavy metals have brought serious environmental pollution problems, and the flammable and explosive characteristics of solvents have brought safety to the environment. Hidden dangers. With the increasing awareness of environmental protection, waterborne coatings have become the main development direction in the field of coatings.
The research of coatings should be developed in the direction of water-based, high solid differentiation, high performance and functionalization. Environmentally friendly coatings (or green coatings) are the common expectations of people. Among the water-based anti-corrosion coatings, water-based epoxy anti-corrosion coatings have become the focus of research in water-based coatings due to their outstanding anti-corrosion properties.