Views: 1 Author: Site Editor Publish Time: 2023-04-19 Origin: Site
Epoxy powder coatings in plastic coated steel pipes have always been the most important part of plastic-coated steel pipes, and also the most important part that determines the quality of plastic-coated steel pipes. However, many customers don't know much about epoxy powder coatings. Let's learn about epoxy powder coatings in plastic-coated steel pipes.
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 The melt viscosity of epoxy powder coating is low, the leveling property is good, and the coating film has no defects such as pinholes and shrinkage cavities;
④ Epoxy powder coatings have many designs and colors, and can be formulated with matte, glossy, patterned, hammered, etc.;
⑤ The coating thickness of epoxy powder coating can reach 50-300 μm at one time, and the uncoated powder can be recycled;
⑥ The coating equipment of epoxy powder coating requires high requirements and large investment and requires complex and sophisticated equipment.
① Epoxy powder coating has strong adaptability, and can be applied by electrostatic spraying, fluidized bed dipping, electrostatic fluidized bed dipping, flame spraying, and other methods, among which electrostatic powder coating is mostly;
② The electrostatic coating voltage of epoxy powder coating is generally 40-80kV, the distance is kept at 150-300 mm, and the amount of sprayed powder should be balanced, at 70-200 g/min;
③ The number of times of electrostatic spraying of epoxy powder coating should not be too much;
④ The baking and curing temperature and time of epoxy powder coatings must be strictly by the requirements, the baking temperature should be uniform, and the local baking temperature should not be too high or too low;
⑤ Problems such as dust pollution and dust explosion must not be ignored when applying epoxy powder coatings.
Application range: Epoxy powder coating is not suitable for substrates with poor heat resistance, because its baking and curing temperature is high, up to 140 ℃, it can be used for decorative protection of electrical switch cabinets, electronic instruments, metal silicon boxes, etc. Electrical insulation protection for motor rotors or copper bars, anti-corrosion, and anti-rust for kitchen utensils, auto parts, ships, building materials, underground facilities, etc.