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How to deal with accidents caused by electrostatic spraying?

Category：questionsPublishedDate：2019-11-06
  •     Electrostatic spraying refers to a coating method in which the atomized coating is negatively charged under the action of a high-voltage DC electric field and adsorbed on the surface of the positively charged substrate by using the corona discharge principle. Electrostatic spraying equipment consists of a spray gun, a spray cup and an electrostatically sprayed high-voltage power supply. Electrostatic spraying is based on the principle of electrostatic attraction, that is, the grounded object is used as the positive electrode, and the oil atomizer (ie, the spray cup or the spray plate) is connected to the high voltage as the negative electrode.
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  •     The effectiveness of electrostatic spraying depends not only on the level of electrostatic spray equipment and management, but also on the type of coating used that meets the requirements for electrostatic coating. In electrostatic coating, the resistivity of the coating is required to be low, and the value is preferably 5 to 50 MΩ·cm. The resistivity of the coating is related to the resin selected in the coating and to the selected solvent component. Therefore, when actually painting. The solvent is often used to adjust the resistivity.
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  •     Electrostatic spray coatings have low resistivity requirements, while conventional coatings have higher resistivity. In order to reduce the resistivity of the coating, a solvent of a suitable polarity is often added to the coating. The wind speed in the electrostatic spray booth is also important. The exhaust air in the spraying chamber is mainly used to exclude the solvent vapor generated during the spraying process, so that the content of the indoor solvent vapor is below the lower limit concentration of the organic solvent explosion to ensure the construction safety. The wind speed of the electrostatic spraying chamber should be controlled at 0.3~0.7m/s, and the wind speed will affect the spraying effect. A wind speed adjustment mechanism should be provided in the air exhaust device.
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  •     Electrostatic spraying equipment is now more and more widely used in the market, but many consumers do not know how to deal with emergencies in spraying equipment. The following is a small series of Bode painting to introduce the treatment methods of spraying equipment in case of urgent problems. 
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  • How to deal with accidents caused by electrostatic spraying?
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  • Electrostatic spraying equipment encountered emergency treatment analysis:
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  •     1. Electrostatic powder coating may cause more electrical disturbances, and the deflection rate of the spray chamber, spray gun device, electric furnace, drying tunnel and other equipment is higher. The electric shock caused by the electrostatic high voltage of the spraying device is often caused by the short circuit of the electric circuit; the electric heating element in the electric heating furnace is aging, the static electricity, the electrical grounding is disordered, the misconnection or the grounding is bad, the appliance will be charged and injured; the mobile device power cable insulation wear and leakage Initiating an event, etc.
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  •     2. From the functional analysis, the incident factors of electrostatic powder coating include many aspects, such as the rationality of the process, the parameters between the processes, the equipment connection rationality, the rationality of the interlocking of the energy device, and the safety warning sign setting equipment is reasonable. Sexuality, effectiveness of blast prevention, trivial safety alarm, rationality of fire-fighting equipment, audio transmission rate and processing content.
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  •     3. The most notable thing in the electrostatic powder spraying operation is the incineration and explosion caused by powder spraying. There are three main types: First, the powder coating is flammable material, and there is the possibility of incineration explosion. 2. In the normal spraying, if the spraying device The distance between the electrode and the workpiece is not correct, and a discharge spark may occur. As long as the constant current power supply works, the ignition energy can cover the minimum incineration energy of the floating powder explosion; the third is the alienation of powder and air in the spray chamber.
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  •     4. The harm of electrostatic spraying equipment can not be ignored. The shot blasting, sandblasting equipment preheating furnace, powder spraying chamber, curing furnace and cooling device in dry pretreatment are all simple events. Workpieces or catenary, hook parts, and detached parts may form a loss of electrostatic spraying equipment, and even make a burning explosion.
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  •     Introduced by Bode's small series, I hope to help you, and finally remind everyone to pay attention to the danger protection of spraying equipment, welcome to read.