The surface treatment of aluminum has been anodized for many years. In order to achieve a strong oxide film and a shiny color, domestic and foreign aluminum alloy grades were carefully selected for aluminum door and window profiles, and finally 6063 alloy (LD31 in China) was selected. The alloy features: good extrusion performance, easy extrusion, medium strength, and the key is to have good oxidation performance, giving aluminum doors and windows a good decorative surface. Mainly manifested in: the oxide film is easy to be born and has high firmness. The oxide film thickness and color difference can be controlled, and the color adhesion is strong and shiny. However, the oxidation coloring color is only white and bronze, and the color is monotonous. Because the oxidation production process puts the aluminum in the oxidation tank for cleaning, oxidation, coloring and sealing. The bath liquid is made of a variety of chemical elements. Every time a batch of aluminum is oxidized, the chemical composition in the bath changes. Therefore, the value of the bath is variable. The aluminum material that is colored by oxidation always has color difference. It is not obvious when placed with the naked eye. If put together in a large area, the color difference will be very obvious. Therefore, the aluminum curtain wall must not be treated with anodizing, otherwise the effect of the aluminum curtain wall will be very poor. The generation of electrostatic spraying solves the surface treatment of the curtain wall aluminum plate, which not only reduces the color difference, but also obtains aluminum plates of various colors. Electrostatic spraying is divided into powder spraying and fluorocarbon spraying. The raw materials of powder spraying are: polyurethane, polyurethane resin, epoxy resin, hydroxy polyester resin and epoxy/polyester resin, which can be formulated in a variety of colors. The characteristics of powder spraying: spraying equipment is manual, automatic suspension, simple construction, coating thickness of 30 microns or more, impact resistance, abrasion resistance, corrosion resistance, weather resistance, etc., the coating price is cheaper than fluorocarbon . The biggest weakness of powder spraying is that it is afraid of ultraviolet rays from the sun. Long-term exposure will cause natural fading. The color difference between the sun-facing surface and the non-sun-facing surface of the aluminum plate is obvious after a few years, and it usually produces obvious color difference in 2-5 years. Nowadays, colored aluminum profile
s appear on the market, which are used for aluminum doors and windows and are sprayed with ordinary aluminum profile powder. Then, the variety of colors of aluminum doors and windows is increased, and the corrosion resistance is also enhanced. Another type of electrostatic spraying is liquid spraying, also known as fluorocarbon spraying, and it is called curium oil in Hong Kong. It belongs to high-grade spraying with a higher price and has been used in foreign countries. In the past two years in China, it has only been widely used in aluminum curtain walls. Due to its excellent characteristics, it has attracted more and more attention and favor from the construction industry and users. Fluorocarbon spraying has excellent anti-fading properties, anti-blooming properties, anti-corrosive properties of atmospheric pollution (acid rain, etc.), strong anti-ultraviolet ability, strong resistance to cracking, and can withstand harsh weather conditions, which is unmatched by general coatings.
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