[Chicago.com] Since the use of electrophoresis in metal decoration and antisepsis, the skills have been cited from different occupations and different raw materials categories since the beginning of the auto career. This skill has been developed rapidly. During the career of aluminum profiles, Japan announced the electrophoresis of aluminum profiles earlier in the 1960s. It has been widely used in the aluminum profession. Since the introduction of the electrophoresis equipment and skills 20 years ago in China, after more than 20 years of development, the distribution of aluminum profiles in China has been carried out in every province and every autonomous region. Electrophoretic aluminum materials have been used in many applications. A lot of color and white aluminum materials have also been developed.
However, at present, the use of white electrophoretic paint is mainly used for aluminum, and the use of electrophoretic paint is basically imported from abroad, and the skills are monopolized by foreign companies. After many years of development and research, Wuhan Collier Chemical Co., Ltd. has announced a high-performance aqueous polyurethane electrophoretic resin, and applied for a national invention patent, and announced on this basis a white polyurethane cathode electrophoretic paint. In Nanhai, Guangdong Province, China has built a cathode vertical white electrophoresis horizontal electrophoresis line for the cathode. After more than three months of trial operation, the equipment runs normally, the electrophoretic bath is stable, and its stable function is thoroughly used in industrial production. Traditional anode white electrophoretic coating has great advantages in technology, energy consumption and environmental protection.
The production of white electrophoretic aluminum material film smooth lubrication, high hardness, good protection, has been used in window decoration aluminum, aluminum profiles, aluminum furniture materials, and has been recognized and respected by customers. The following is a discussion and communication on the white polyurethane electrophoretic paint technology and electrophoresis production line equipment of Wuhan Collier Chemical Co., Ltd.
Traditional Technology: (anodic acrylic white electrophoretic coating)
1 Degreasing → 2 activity washing → 3 alkaline etching → 4 hot water washing → 5 activity washing → 6 neutralization → 7 activity washing → 8 activity washing → 9 oxidation → 10 activity washing → 11 activity washing → 12 pure water washing → 13 pure water washing → 14 anode white electrophoresis → 15 pure water wash (spray) 16 → pure water wash → 17 pure water wash → 18 dry
New technology (cathode polyurethane white electrophoretic coating, Wuhan Collier production line as an example)
1 Degreasing → 2 activity washing → 3 activity washing → 4 pure water washing → 5 pure water washing → 6 pure water washing → 7 cathode polyurethane white electrophoresis → 8UF water washing (spray) → pure water washing → 10 pure water washing → 11 drying
Compared with the traditional technology, the new technology simplifies a lot in the process and operation, and the operation is quick and the power is improved. Taking an existing cathodic polyurethane white electrophoretic coating production line as an example, it is mainly used for aluminum profile curtain track.
First, the main equipment:
1. Electrophoresis tank: Material PVC, equipped with liquid circulation filtration system, ultrafiltration system, cold and heat exchange cycle system, anode compartment, its requirements: the coated workpiece is 10-20cm from the bottom in the tank, not from the plate Less than 15cm, immersed in the liquid surface 5-10cm, tank surface flow rate of 0.2m / s, the amount of circulation 4-6 times / hour.
2, ultrafiltration machine: ultrafiltration that is after a semi-permeable membrane, can be suspended in the bath liquid pigment, polymer resin section back to make the deionized water in the bath liquid organic solvents, inorganic impurities such as through the semi-transparent Membrane collecting and sinking becomes ultrafiltration soaking liquid. Its types include tube type, roll type, hollow fiber type and plate type. Currently, there are more rolls and hollow fibers. During this period, the choice of hollow fiber or ultrafiltration membrane is KL-Q04. Ultrafiltration system, displacement 200L/h.
3, pure water machine: electrophoresis higher demand for pure water, good pure water is to ensure that the electrophoretic coating function and the quality of the foundation, the line selected for the R-1000 anti-soaking water machine, the amount of 1T/h.
4, power: The current domestic electrophoretic coating power supply and the international choice of power supply is not much difference, during which there is a soft start to stop, automatic timing function, voltage limit activity, over-current short-circuit, over-maintenance function, its Borovn elements.
5, cold and heat exchangers: The use of imported brand inverter compressors and electronic control single control, cooling and heating sub-valve control, a total of cycle, can be a machine multi-slot equipment.
6, linked to: according to the demand for product planning
Second, technical parameters and requirements are as follows:
Degreasing: This process is mainly to remove the oxide skin and oil pollution of the aluminum workpiece. This line selects Wuhan Collier acid degreaser K-301, the concentration of 5-8% at the time of 5-8min, room temperature.
Activity washing two: remove the residual water and debris in the workpiece gap, the demand PH ≥ 5.5, conductivity ≤ 180μs/cm, each one minute.
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