The following are instructions for electrostatic spraying
Electrostatic spraying refers to the coating method that uses the principle of electrostatic discharge to make the atomized coatings negatively loaded under the action of a high -voltage DC electric field, and adsorb on the surface discharge method of the ruffled power base. The electrostatic spraying equipment consists of spray guns, spray cups, and electrostatic spraying high -voltage power.
Requirements for electrostatic spraying
The effect of electrostatic spraying depends not only on the electrostatic spraying equipment and management level, but also depends on whether the coating variety used meets the requirements of electrostatic coating. During electrostatic coating, the resistivity of the coating is required to be low, and the value is 5 to 50MΩ · cm. In addition to the resin in the coating, the resistivity of the coating is also related to the selected solvent component. So in actual painting. It is often used to adjust the solvent to adjust the size of its resistance.
The resistivity of the coating of the electrostatic spray coating is low, while the resistivity of common coatings is relatively high. In order to reduce the resistivity of the coating, proper polar solvents are often added to the coatings.
The electrostatic spraying indoor wind speed is also very important. The exhaust air in the spraying room is mainly used to exclude the solvent vapor generated during the spraying process, and the content of indoor solvent vapor is below the lower limit of the organic solvent explosion to ensure the safety of construction. The wind speed of the electrostatic spraying room should be controlled at 0.3 ～ 0.7m/s, and the wind speed will affect the spray effect. The wind speed adjustment mechanism should be set in the exhaust device.
Types of electrostatic spraying
The type of electrostatic spray can be divided into two categories: pure static atomization and additional electrostatic atomization.
1) Pure static atomization method
It is represented by a rotary cup static spray gun. The rotating spray gun structure is simple, it is not easy to block, and it is easy to clean; because it is a mechanical centrifugal electro -atomization, the conductivity of coatings and solvents is low (of course, the conductivity is also good); The uniformity is greatly improved; the coating after atomization is fine, the surface is flat and smooth. It is more suitable for workpieces with simple shapes.
2) There is an additional energy electrostatic atomization method
According to the types of additional energy, they are divided into two types of air atomization method and hydraulic atomization method. The whirlwind spray gun and hand -mounted static spray gun belong to the air atomization. They use the function of compressing air and electrostatic power to atomize the coating, so they can spray objects with complicated or large area in shape. Hydraulic atomization is a combination of high -voltage airless spray coating and static spray coating equipment. It is to press the paint to press the paint to a higher pressure range with the help of pressure, and then spray it from the small hole of the nozzle. It is sprayed with high pressure paint into the atmosphere and immediately expands the fustorization.
Compared with the air atomization method, hydraulic atomization is better, with a large amount of spraying, high coating efficiency, and the requirements for coating are similar to air atomization.
Characteristics of electrostatic spraying
(1) The construction environment and working conditions are good.
(2) The paint utilization rate is high.
(3) The finishing quality is good.
(4) High finishing efficiency.
The main disadvantage of the electrostatic spraying method is the high risk of fire, especially when spark discharge is caused by improper spray distance or misoperation, it is easy to cause fire. Therefore, there must be reliable fire and explosion-proof facilities, and strict compliance with safety operating procedures. In addition, for surfaces with complex shapes or deep contours, it is difficult to obtain a uniform coating by electrostatic spraying.
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Post time: Mar-09-2023