how powder coating works

Powder coating is a new type of 100% solid powder coating without solvent. With no solvent, no pollution, recycling, environmental protection, saving energy and resources, reduce labor intensity and high mechanical strength of the film. Curing conditions of high classification standards, the name of all kinds of powder on the market is uneven. According to the properties of the film forming material is divided into two categories: thermoplastic coating (PE) and thermosetting coating. Or the appearance of the film into a film category: extinction type, high light type, art, etc.. Can also be classified by use.

The application of powder coating mainly rely on electrostatic spraying to complete, the so-called electrostatic spraying is the use of high voltage electrostatic corona electric field principle. The high voltage negative electrode is connected to the metal flow guide mark on the spray gun head, and the cathode is formed by the spraying work piece, so that a strong electrostatic field is formed between the spray gun and the workpiece. When the compressed air as the carrier gas, the paint from the guiding rod for powder barrel by powder pipe to spray gun, the corona discharge guide rod is connected with the high voltage anode is generated, and the negative charge density in the vicinity of the powder, with a negative charge, and entered into the field of electrostatic field strength is very high. In the dual role of static electricity and gas, powder evenly to the ground surface of the workpiece forming powder layer of uniform thickness, and heat curing into durable coating.

Because the processing and the spraying method are simple, the powder coating can only be heated and melted, and the flow is smooth, the cooling or the extraction can be solidified into a film, and the complicated solidification device is not needed. Most of the raw materials used are common polymers in the market, most of the conditions can meet the requirements of the use of performance. But there are some disadvantages, such as high melting temperature, low color level, and poor adhesion to metal surface. However, the commonly used thermoplastic coating exhibit some unique properties, including polyolefin coating has excellent solvent resistance; PVDF coating has outstanding weatherability; polyamide has excellent wear resistance; polyvinyl chloride has better price / performance ratio; thermoplastic polyester coating has beautiful appearance, art the advantages of.