Spraying Requirements of Powder Coatings

Powder spraying construction technology and requirements for powder electrostatic spraying is the use of high voltage electrostatic corona electric field principle. A high voltage negative electrode is connected to the metal guide mark at the head of the spray gun, and the sprayed workpiece is grounded to form a positive electrode, so that a strong electrostatic field is formed between the spray gun and the workpiece. When the compressed air, as the carrier gas, sends the powder coating from the powder supply barrel to the guide rod of the spray gun through the powder pipe, the corona discharge occurs because the guide rod is connected with the high-voltage negative electrode, and a dense negative charge occurs near the guide rod, which makes the powder carry negative charge and enter the electrostatic field with high electric field strength. Under the action of electrostatic force and carrier gas, the powder is sprayed evenly to the guide rod The surface of the workpiece forms a uniform powder layer, which is then heated and solidified into a durable coating.

(1) In order to give full play to the special function of powder coating and prolong the service life of coating film.
(2) When spraying, the coating must be completely grounded to increase the spraying efficiency of powder coating.
(3) Check immediately after powder spraying. If any defect is found, it should be dealt with in time. If any defect is found after curing, its small scale is only partial and does not affect the whole. The surface decoration of the coating can be repaired by diluting the same color powder with acetone. If the large scale affects the surface quality, it should be polished with sandpaper, sprayed again or removed with paint remover, and then re coated with Suo powder.
(4) The recovered powder must be treated and mixed with the new powder according to a certain proportion after removing the impurities.