[China Aluminum Network] At present, China's aluminum processing industry is facing a fierce attack such as Handan Iron and Steel and other types of alternatives. The reason is that in addition to the poor thermal insulation of aluminum, its monotonous color is also a major reason. Although spraying technology can handle the monotonous problem of color, masking sprays cause aluminum products to lose their metallic luster, rough surface, and high production costs. Traditional oxidation-coloring-sealing technology and modern oxidation-coloring-electrophoresis technology, but also monotonously restrained the rapid development of the aluminum industry, ordinary dye base can not handle the stability and thermal stability of aluminum finished products doubt. Under the guidance of the expert group of Beijing Institute of Technology, the company successfully handled the GS-RS series aluminum dyes' optical stability questions; at the same time, under the cooperation of a foreign authority, it successfully processed the thermal stability of the product. doubt. The aluminum parts dyed by this product are rich in color and have a smooth surface and retain metallic luster. This technology breaks through the exclusion of dyes from the restricted area of ​​aluminum products and lays a solid foundation for the rapid development of the aluminum processing industry.
First, the main features
1, beautiful color, color is complete. At present, a total of 131 color labels (GY-RS001-GY-RS131) ​​have been developed for selection.
2. The bath is stable and easy to operate. Most of the dye technology PH value between 5.5-6.5, within this range can be used sodium acetate buffer pH, stable dyeing ability, useful control color.
3, heat and light resistance, adhere to gloss. GY-RS series aluminum dyeing agent has strong anti-ultraviolet and heat-resistant ability to ensure that the dyed aluminum parts can withstand long-time sunlight shine without fading. Unlike masking sprays, this series of aluminum dyes adopts filled dyes, and aluminum stained with this dye retains metallic luster.
4, the capital is moderate, shopping malls are broad. The cost of dyed aluminum products and electrolytic coloring of aluminum products is appropriate because of the rich coloration, which has greatly expanded the market for aluminum products, improved the level of electrophoretic profiles, enhanced the competitiveness of closed-cell profiles, and satisfied the production of household appliances. Industrial materials, decoration and other needs.
Second, the basic principle
GY-RS aluminum dyeing is a central technique between anodic oxidation and sealing (electrophoresis) and is the result of both electrical and electrochemical bonding. The uniform diameter of the dye molecules is 0.0025 μm, and the uniform diameter of the micropores of the anodized film is 002 μm. Under the electric effect and the chemical bonding effect, the dye molecules are introduced into the micropores of the oxide film to form a dyed film.
Third, technical parameters
1, staining temperature: 55-65 °C;
2, staining time: 5-15 minutes;
3, PH value: 5-6
4, staining concentration: 5±1g/L
5, consumption: 5g/m2
Fourth, bath handling and manipulation
1. Bath production: Use deionized water to make the bath solution. The dyeing agent must be fully dissolved and filtered, mixed evenly, and filtered for 24 hours before being used.
2, bath handling and control:
(1) PH adjustment. Pay attention to investigate the change of PH value, timely adjust the PH value according to the technical parameters, use 1:20NaOH solution to catch the high PH value; use 1:10 glacial acetic acid solution to decrease the PH value.
(2) Adjustment of bath concentration. When the temperature, PH value is stable, to adhere to the color, extend the time beyond 2 minutes, in a timely manner by 0.25g / L increase coloring agent.
(3) Bath liquid maintenance: When the bath liquid is used, it is necessary to use the circulating pump to filter the impurities and sediments of the bath liquid; when the bath liquid is not used, it is necessary to stop heating, mask and maintain the bath liquid to prevent various acids. Alkali and impurities contaminate the bath.
(4), bath replacement. When the PH value and temperature are stable, it is necessary to maintain the color. When each increase exceeds 0.5g/L, drain 1/3 of the bath solution in time, make up the water and make up for the stain by 1.6-1.8g/L.
V. Dyeing equipment and conditions
1. Dyeing trough body, the depth and length of the required dyeing trough are the same as that of the oxidation trough, and the width of the dyeing trough body is 0.8-1.0m, which is anticorrosive with PVC data.
2, heating equipment. It is installed horizontally at the bottom of the dyeing tank and consists of a serpentine heat exchanger and a steam generator.
3. The mixing equipment is placed at the bottom of the dyeing tank and consists of a perforated PVC pipe and an air compressor.
4. Filtration equipment consisting of perforated PVC pipe, circulating pump and filter:
5, oxidation technology, it is necessary to carry out normal oxidation, oxide film thickness is necessary to 10μm.
6, sealing (electrophoresis) technology, sealing (electrophoresis) is necessary to reach the national standard.
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