Zhejiang Changming Chemical Products Co.,Ltd.

thermosetting powder coating

• Category :

  Paint and Coatings

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• Product description :

  Electrostatic powder coating is one of the most environmentally friendly and economical technologies in surface treatment. Since the early 60’s, powder-coating paints have been available on the market and their problem-free production and processing made powder coating a well-established and commonly recognized technique. In fact, powder coatings are - environmentally friendly - energy-saving - safe to handle and process - highly economical. New developments focus on thin-film powders, powders for specific applications and radiation curing systems. Electrostatic powder coating is based on the fact that particles with opposite charges attract each other. This is why most of the conductive and thermally stable solids are suitable for powder coating. Today, electrostatic powder coating considerably increases its presence in the domain of metallic objects such as: - aluminum profiles - fa鏰de elements - household appliances - automotive accessories (e.g. rims, roof racks) - office furniture - storage equipment - outdoor furniture - wire products etc. The powder coating process: Dry coating powder is filled in a hopper, fluidized or stirred and subsequently transported by means of compressed air via injectors to the powder gun. In this gun, high voltage is created from a low voltage of 10V utilizing the cascade principle. During the spraying process, one or more electrodes charge the powder with 60 - 100 kV. An electrical field is generated between the gun and the grounded workpiece. The powder particles follow the field lines and, due to the residual charge, remain bonded to the object (3). Once coated, the workpieces are either manually or automatically transferred to a curing oven. Plastic powders are cured at temperatures between 140ºC and 200ºC, fusing into a smooth coating with layer thicknesses of 30 - 80μ for decorative and 200 - 500μ for functional purposes. Enamel powders may be applied in a layer thickness range of 80 - 200μ, requiring sensitively higher curing temperatures varying from 780°C to 830ºC due to their specific chemical properties.