The electrophoresis coating technology of shallow control management

Source: China coating network

Electrophoresis paint solvent content contains the function help dissolve water-soluble organic solvent, compared with other coating content is smaller, but it has certain influence on the stability of film thickness and coating, general requirements control within a certain range. Higher working liquid in the solvent content, film thickness thickening, swimming through force and breakdown voltage; Low solvent content, film thickness, film appearance (smooth). The solvent content in the working liquid height can be adjusted by adding solvent and replace the ultrafiltrate.

Swimming swimming in electrophoretic coating time slot of time refers to the coated workpiece under the working liquid liquid surface to form coating (electricity). This period of time generally limits at about 3 min. With the swimming time, thickening of the film thickness. Swimming can increase or decrease with time indirectly affect the film surface smooth and appearance quality. Swimming with time play an important role in the electrophoretic coating process management, appropriate increase swimming swimming with voltage can shorten the time and at lower voltage when swimming with increasing the swimming time, to ensure that the thickness of paint film.

Swimming with voltage in the electrophoretic painting line, swimming with voltage to control the speed of film forming of electrophoretic coating process and the precipitation amount, usually working fluid temperature and swimming time is certain, if you need to increase or reduce the membrane thickness, can be implemented by raising or lowering voltage. In continuous production line of electrophoretic coating equipment, general energized the first section of the voltage control under the lower limit of working voltage, the second section of the voltage control in the working voltage even slightly higher.

Recycling cleaning after electrophoresis was after electrophoresis paint are out of the groove on the surface are not swim with attached working liquid, such as direct drying produces spot film ills, if directly out of the trough the waste. To eliminate film ills and recycling liquid, must be washed after electrophoresis coating. Electrophoresis after cleaning can be divided into two phases: recovery out of the working liquid: at the notches with ultra filtrate or deionized water washing, wash directly back into the groove, the best in the coated object is out of the trough within 1 min for cleaning. Improve the appearance of the paint film performance: use cycle ultrafiltrate wash often wash 23 times, finally rinse with deionized water.

For two-component epoxy sealing primer, before the use will be a good points in strict accordance with the proportion of 121 b, can be used after mixed mix, besmear in the concrete component surface, uniform without brush, the next working procedure after 26 h. Will a points b epoxy asphalt anticorrosive paint in strict accordance with the proportion of 31, after mixed besmear to brush on the two-component epoxy sealing primer on the surface, two construction, requires uniform without brush, paint film thickness of 100120 m, 1824 h after coating of next working procedure.

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