Application Steps of Thermoplastic Powder Coatings

There are many kinds of thermoplastic powder coatings, but specifically can be divided into two categories: thermoplastic powder coatings and thermosetting powder coatings.

1) Thermoplastic powder coating is composed of thermoplastic resin, pigment, filler, plasticizer and stabilizer. Thermoplastic powder coatings include: polyethylene, polypropylene, polyester, polyvinyl chloride, chlorinated polyether, polyamide, cellulose and polyester.

2) Thermosetting powder coatings are composed of thermosetting resins, curing agents, pigments, fillers and additives. Thermosetting powder coatings include epoxy resin, polyester resin and acrylic resin.

The Application Method of Thermoplastic Powder Coating Is As Follows:

1) Turn on the heating power of the oven, start the conveyor belt, adjust the oven temperature to the curing temperature according to the powder coating curing conditions provided by the supplier, and make the running time of the conveyor belt in the oven meet the curing time. Considering the temperature drop of the oven inlet and outlet and the difference between the actual working temperature and the oven instrument temperature, the running time can be flexibly increased by 10-20% or 5-10 ℃
2) Start the air compressor, randomly check part of the powder coating, insert the powder suction pipe of the spray gun into the powder container, adjust the working voltage to 40000-80000 V, and the air pressure to 0.8-2.5kg/cm. The distance between the spray gun and the work is 15-25cm. Spray one or several pieces, put them into the oven and bake them according to the curing conditions, and check whether they meet the quality requirements by comparing the test spray plate with the sample plate.

3) The workpiece is placed on the conveyor belt for degreasing, derusting, phosphating, passivation, water washing, drying, spraying in the spray room, baking in the oven according to the curing conditions, cooling out of the oven, next piece inspection and packaging.
4) The relationship between temperature and time is inversely proportional in curing conditions. With the increase of temperature, the curing time is shortened, and with the increase of time, the curing temperature is decreased.