[China Aluminum Network] Since the application of electrophoresis technology in the decoration and corrosion protection of metals, this technology has been applied to different industries and different material fields since the automotive industry. This technology has been rapidly developed. Among them, in the aluminum profile industry, Japan developed electrophoresis technology for aluminum profiles earlier in the 1960s, and it has been widely used in the aluminum industry. Since the introduction of this electrophoresis equipment and technology in China 20 years ago, after more than 20 years of development, China's distribution in the construction of aluminum profiles industry has developed into production lines in every province and autonomous region, and electrophoretic aluminum material has been used in a large number of applications. At the same time, color and white aluminum materials have also been greatly developed.
However, at present, the application of white electrophoretic paint is mainly used for aluminum materials, and the anode electrophoretic paint is used, which is basically imported from abroad. The technology is monopolized by foreign companies. After years of development and research, Wuhan Collier Chemical Co., Ltd. has developed a high performance aqueous polyurethane cathodic electrophoretic resin and applied for a national invention patent. Based on this, it has developed a white polyurethane cathodic 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 stability can be fully adapted to industrial production. The traditional anode white electrophoretic coating has great advantages in terms of process, energy consumption and environmental protection.
The production of white electrophoretic aluminum material film smooth, high hardness, good protection, has been promoted in window decoration aluminum, aluminum profiles, aluminum furniture materials, and has been recognized and respected by customers. The following is a discussion and exchange on the white polyurethane electrophoretic paint process and electrophoresis production line equipment of Wuhan Collier Chemical Co., Ltd.
Traditional process: (anode acrylic white electrophoretic coating)
1 Degreasing→2 flowing washing→3 alkaline etching→4 hot water washing→5 flowing washing→6 neutralization→7 flowing washing→8 flowing washing→9 oxidation→10 flowing washing→11 flowing washing→12 pure washing→13 pure washing→ 14 anode white electrophoresis → 15 pure water wash (spray) 16 → pure water wash → 17 pure water wash → 18 drying new process (cathode polyurethane white electrophoretic coating, Wuhan Collier production line as an example)
1 Degreasing → 2 flow washing → 3 flow 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 new technology and Compared with the original process, the original process is much simpler in terms of process and operation, and the operation is convenient and the efficiency is improved. Taking an existing cathode polyurethane white electrophoretic coating production line as an example, it is mainly used in aluminum profile door curtain tracks.
First, the main equipment:
1. Electrophoresis tank: Material PVC, equipped with liquid circulation filtration system, ultrafiltration system, cold and heat exchange circulation system, anode diaphragm box, 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 or so, the amount of circulation 4-6 times / hour.
2, ultrafiltration machine: ultrafiltration through a semi-permeable membrane, can be suspended in the bath liquid pigment, polymer resin section back to the deionized water in the bath liquid organic solvents, inorganic impurities, etc. through the semi-transparent Membrane collection and confluence together become ultrafiltration permeate. The varieties include tube type, roll type, hollow fiber type and plate type. At present, there are more coil type and hollow fiber types, among which the hollow fiber or ultrafiltration membrane is KL-Q04 type. Ultrafiltration system, displacement 200L/h.
3, pure water machine: electrophoresis on the high demand of pure water, good pure water is to ensure the performance and quality of electrophoretic coating based on the line selected for R-1000 reverse osmosis water machine, the amount of 1T/h.
4. Power Supply: The current domestic electrophoretic coating power supply is not much different from the power supply used in the world. Among them, there is a soft start to stop, automatic timing function, voltage limit flow energy, over-current short circuit, and over-cut protection function. The Bovin factor.
5, cold and heat exchangers: the use of imported brand inverter compressor and electronic control single control, cooling and heating sub-valve control, common management cycle, can be a machine multi-slot configuration.
6, rack: According to the requirements of the product design II, process parameters and requirements are as follows:
Degreasing: This process mainly removes oxide skin and oil stains on the surface of aluminum workpieces. This line selects Wuhan Collier acid degreaser K-301 with a concentration of 5-8% for 5-8 min at room temperature.
Flow washing two: remove the residual water and surface dirt in the workpiece gap, requires PH ≥ 5.5, conductivity ≤ 180μs/cm, time each one minute.
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