Classification of common anti-corrosion coatings for petrochemical equipment, etc
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1. Epoxy anti-corrosion coating: Epoxy anti-corrosion coatings are typically composed of two components: epoxy resin and a curing agent. It is characterized by good weather resistance, low toxicity, and good elasticity; its corrosion resistance is somewhat poor. It belongs to other synthetic resins such as phenolic resin and urea-formaldehyde resin. 2. Oil-based coatings: Oil-based coatings are a type of coating whose main film-forming component is drying oil. It is characterized by easy production, good paintability, excellent wetting of surfaces, low cost, and a flexible paint film. However, it dries slowly, the film remains soft, its mechanical properties are poor, and it has weak resistance to acids, alkalis, water, and organic solvents. 3. Raw lacquer: Raw lacquer is a milky-white, sticky liquid that flows out when the bark of a living lacquer tree is cut open; it is purified by filtering it through fine cloth to remove impurities. Raw lacquer has strong adhesion, a tough paint film, and good luster; it is resistant to soil corrosion, as well as to water and oil to a certain extent. The downside is that it is toxic and can cause skin allergies. Furthermore, it is not resistant to strong oxidizing agents and has poor resistance to alkalis. 4. Modified raw lacquer latex paint: There are many types of modified raw lacquer latex paints, which to varying degrees overcome the aforementioned disadvantages. Resin-based coatings and phenolic resin coatings: These mainly include alcohol-soluble phenolic resins, modified phenolic resins, and pure phenolic resins.
The main types of anti-corrosion coatings commonly used in petrochemical equipment are as follows: 1. **Epoxy anti-corrosion coatings**: Composed of epoxy resin and a curing agent, they have good weather resistance, low toxicity, and decent elasticity, but their corrosion resistance is somewhat weaker. 2. **Oil-based coatings**: Their main component is drying oil; they are inexpensive, easy to apply, and produce a flexible paint film. However, they dry slowly, have poor mechanical properties, and are not resistant to acids, alkalis, water, or organic solvents. 3. **Raw lacquer**: A coating derived from natural lacquer trees, featuring strong adhesion, a tough lacquer film, and good luster. It is resistant to soil corrosion as well as water and oil, but it is toxic, can cause allergies, and is not resistant to strong oxidizing agents and alkalis. 4. **Modified raw lacquer latex paint**: An improvement over raw lacquer that reduces its toxicity and other drawbacks, thereby enhancing its practicality. There are also **phenolic resin coatings**, such as alcohol-soluble, modified, and pure phenolic resin types. .