[China Aluminum Network] After 20 years of development, China's aluminum industry has formed a complete industrial system and has become one of the pillar industries of the national economy. The output of primary aluminum has reached more than 2.5 million tons, accounting for the third place in the world. It has more than 1,000 aluminum processing enterprises, the production capacity has reached 3.5 million tons/year, and the output of aluminum profiles has reached 1 million tons/year. At present, it has entered the period of high-end development. The surface treatment technology of aluminum profiles has developed rapidly. It has developed from a single bronze material to powder coating, spray fluorocarbon coating, organic and inorganic dyeing, electrophoretic coating, mechanical and chemical polishing. A new generation of wood grain processing technology, three-stage electrolytic multicolor coloring and micro-arc oxidation coloring technology are also in trial production. The appearance of aluminum profiles are titanium, golden, champagne, imitation stainless steel and various colors, as well as display. Mirror, sandstone, matt, pearlescent and other special effects. Among the many surface treatment technologies, electrophoretic coating is a more applicable technology. Aluminum anodized and electrolyzed and then electrophoretically coated, with double protection. With high transparency, high metal texture, high corrosion resistance and high weather resistance, it is more decorative than spray paint and powder coating. It is deeply loved by users and has been widely used in home decoration. The potential market is extremely large. Second, the process is easy to implement, as long as the addition of several tanks in the original production line and aluminum oxidation coloring line production, water-soluble electrophoretic coating security, can achieve closed loop, is conducive to environmental protection. Third, the more important is that the electrophoretic profiles are more attractive and are examples of high-grade and luxurious profiles. Having an electrophoretic coating line becomes an important symbol of the comprehensive technical level of the aluminum profile plant.
Electrophoretic coating of aluminum profiles 1 Characteristics of electrophoretic coating Since the use of electrophoretic coatings in Ford Motor Company's wheel coating line in the 1930s, its application has been rapidly developing. Transparent, weather-resistant acrylic and polyurethane electrophoretic coatings have been successfully used for the decoration and protection of metal surfaces since the 1970s, such as protection of copper signs, decoration and protection of stainless steel and electroplated products, as a protective finishing layer The most representative is the electrophoretic coating of architectural aluminum profiles.
The traditional surface treatment process for aluminum profiles is oxidation, coloration, and sealing. The aluminum conversion film is prone to corrosion and has poor durability when used outdoors for extended periods of time, especially in acid rain or marine environments. , People try to use paint coating method to improve the decorative aluminum building materials and the service life, at present, has been successfully used in industrial electrophoretic paint, powder coating and fluorocarbon spray. Since the electrophoretic coating is a water-based coating, the aluminum material can be directly electrophoresed after being washed by the pretreatment. The electrophoretic coating has a high transparency, and has both high decorativeness and highlights the metallic luster of the aluminum profile itself. Therefore, there are more and more aluminum profiles. Electrophoretic coating is used.
Electrophoretic coating has the following advantages over other coating methods:
(1) Easy to achieve automated production. Since the electrophoretic coating is performed in an aqueous electrophoresis tank, similar to the anodizing and electrolytic coloring processes, the processing time is short, and it is easy to realize the assembly line operation of the entire process.
(2) The film is uniform and dense. Due to the high throwing power of the electrophoretic coating, it is possible to obtain a uniform coating film for a profile of a complex shape, and to control the film thickness by adjusting the amount of electricity.
(3) The utilization rate of paint is high. Due to the low viscosity, the workpieces are carried less, and the electrophoresis workpieces can be washed with water. The utilization of the recovery device enables the electrophoretic coating to have a utilization rate of more than 95%.
(4) Safety and environmental protection. Because the electrophoretic coating is diluted with water, the solid content is low, and the solvent content is low, it is an environment-friendly paint, and the risk of fire is eliminated, and the health of the workers is also guaranteed.
(5) The coating quality is good. Acrylic resin is cured with amino resin to ensure the high decoration and high corrosion resistance of the coating film. At the same time, because the resin is highly transparent, it effectively highlights the metal texture, and can also be decorated with matte, sand, pearlescent and other decorative effects.
(6) Compared with the conventional electrolytic coloring and sealing process, it has the advantages of time saving and labor saving. The electrophoretic coating film does not need to be sealed, and cracks and other defects caused by bad sealing are avoided.
(7) The thickness of the coating film can be freely controlled, and both the 7 μm and 12 μm are generally controlled at home and abroad.
(8) Since the electrophoretic layer is transparent and bright, aluminum ingots are required to have a high quality, a smooth surface of the extruded material, fewer mechanical defects, and a strict management of the oxidative coloring process because any minute defects and stains will be exposed in the clear lacquer.
(9) High requirements for electrophoresis process management to increase the yield.
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