Characteristics And Construction Methods of Epoxy Powder Coatings

The characteristics of epoxy powder coating are as follows:
① Epoxy powder coating has strong adhesion, especially to metal;
② The paint film of epoxy powder coating has good mechanical properties, high hardness, scratch resistance, and corrosion resistance;
③ Epoxy powder coatings have low melt viscosity and good leveling properties, and the coating film is free of defects such as pinholes and shrinkage cavities;
④ There are many varieties of epoxy powder coatings, and they can be formulated into matte, glossy, patterned, hammered, etc.;
⑤ The coating thickness of epoxy powder coating can reach 50-300 μm in one application, and the uncoated powder can be recycled;
⑥ The coating equipment of epoxy powder coating has high requirements, large investments, and requires complex and precise equipment.

Main varieties:
The main varieties of epoxy powder coatings include epoxy glossy powder coatings, epoxy matte powder coatings, epoxy matte powder coatings, epoxy semi-gloss or flat powder coatings, epoxy electrophoretic powder coatings, as well as antibacterial, conductive, Flame retardant, artistic and other functional epoxy powder coatings.

Construction matters:
① Epoxy powder coating has strong adaptability and can be constructed by electrostatic spraying, fluidized bed dip coating, electrostatic fluidized bed dip coating, flame spraying, and other methods, among which electrostatic powder coating method is the most common;
② The electrostatic coating voltage of epoxy powder coating is generally 40-80kV, the distance is maintained at 150-300 mm, and the amount of sprayed powder should be balanced at 70-200 g/min;
③ The number of electrostatic sprays of epoxy powder coating should not be too many;
④ The baking and curing temperature and time of epoxy powder coatings must be strictly to the requirements, and the baking temperature must be uniform to avoid local baking temperatures that are too high or too low;
⑤ Issues such as dust pollution and dust explosion must not be ignored when applying epoxy powder coatings.

Scope of application: Epoxy powder coating is not suitable for substrates with poor heat resistance because its baking and curing temperature is high, reaching 140°C. It can be used for decorative protection such as electrical switch cabinets, electronic instruments, and metal silicon boxes. Electrical insulation protection of motor rotors or copper rows, anti-corrosion and anti-rust of kitchen utensils, auto parts, ships, building materials, underground facilities, etc.