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Electrostatic spraying is a spraying method that uses a high-voltage electrostatic electric field to orient the negatively charged coating particles in the opposite direction of the electric field and adsorb the coating particles on the surface of the workpiece. Electrostatic spraying equipment consists of a spray gun, a spray cup and an electrostatically sprayed high-voltage power supply.
Introduction Electrostatic spraying is a spraying method that uses a high-voltage electrostatic electric field to orient the negatively charged coating particles in the opposite direction of the electric field and adsorb the coating particles on the surface of the workpiece. Electrostatic spraying equipment consists of a spray gun, a spray cup and an electrostatically sprayed high-voltage power supply.
Working principle of electrostatic spraying When working, electrostatic spray gun or spray disc, spray cup, paint particles are connected to the negative pole, workpiece is connected to the positive pole and grounded. Under the high voltage of high voltage power supply, the end of spray gun (or spray disc, spray cup) An electrostatic field is formed between the part and the workpiece. The electric field force of the paint particles is proportional to the voltage of the electrostatic field and the charge of the paint particles, and inversely proportional to the distance between the spray gun and the workpiece. When the voltage is high enough, the air ionization zone is formed in the vicinity of the end of the spray gun, and the air is intense. Ionization and heat generation, so that a sharp red halo is formed around the sharp edge of the gun or around the pole, which is clearly visible in the dark, when the air produces a strong corona discharge.
Most of the film-forming materials in the paint, such as resins and pigments, are composed of high molecular organic compounds, mostly conductive dielectrics. In addition to film-forming materials, solvent-based coatings also contain organic solvents, cosolvents, curing agents, and electrostatic thinners. And other types of additives and other substances. Such solvent-based substances, besides benzene, xylene, solvent gasoline, etc., are mostly polar substances, have low electrical resistivity and have a certain electrical conductivity, and they can improve the charging performance of the coating.
The molecular structure of the dielectric can be divided into two types: polar molecules and non-polar molecules. A dielectric composed of polar molecules exhibits electrical properties when subjected to an applied electric field; a dielectric composed of non-polar molecules is good.
The paint is sprayed out after being atomized by the nozzle, and the atomized paint particles are charged by the contact of the needle or the spray plate of the muzzle and the edge of the spray cup. When the gas ionization zone generated by the corona discharge is passed, Increase its surface charge density once. Under the action of the electrostatic field of these negatively charged coating particles, the surface of the workpiece with the polarity of the guide moves and is deposited on the surface of the workpiece to form a uniform coating film.
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