Characteristics and construction methods of epoxy powder coatings for plastic-coated steel pipes

First, the characteristics of epoxy powder coatings for plastic-coated steel pipes are as follows:

① Epoxy powder coatings have strong adhesion, especially to metals;

② The paint film of epoxy powder coatings has good mechanical properties, high hardness, scratch resistance, and corrosion resistance;

③ Epoxy powder coatings have low melt viscosity and good leveling, and the coating film is free of defects such as pinholes and shrinkage holes;

④ Epoxy powder coatings have many colors and can be formulated into matte, glossy, patterned, hammered, etc.;

⑤ The coating thickness of epoxy powder coatings can reach 50-300 μm in one coating, and the uncoated powder can be recycled;

⑥ The coating equipment requirements of epoxy powder coatings are high, the investment is large, and complex and precise equipment is required.

Second, the main types of epoxy powder coatings for plastic-coated steel pipes

The main types 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, and functional epoxy powder coatings such as antibacterial, conductive, flame retardant, and artistic.

Third, the construction matters of epoxy powder coating for plastic-coated steel pipes

① Epoxy powder coating has strong adaptability and can be constructed by electrostatic spraying, fluidized bed dipping, electrostatic bed dipping, flame spraying, and other methods, among which electrostatic powder coating is the most common method;

② The electrostatic coating voltage of epoxy powder coating is generally 40-80kV, the distance is kept at 150-300 mm, and the spray powder volume 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 coating should be strictly to the requirements, and the baking temperature should be uniform to avoid local baking temperature being too high or too low;

⑤ Dust pollution, dust explosion, and other problems should not be ignored when applying epoxy powder coating.

Fourth, the application scope of epoxy powder coating for plastic-coated steel pipes

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