Shanxi Jianlong Successfully Developed Ultra-Thick Paint Film Color Coated Steel Plate

How long can ordinary color-coated steel sheets withstand repeated attacks from sea salt spray, chemical acid mist, industrial waste gas, and strong ultraviolet rays?

The answer given by Shanxi Jianlong is: more than 20 years.

Recently, the 40μm thick fluorocarbon coated steel sheet (Prices) with a front surface, developed and produced by Shanxi Jianlong's 1500mm color-coated steel sheet production line, has been successfully applied to the building envelope system of a key project. The wall surface is smooth and elegant, with a bright and beautiful color, and has been highly praised by the user. This marks another key breakthrough for the company in the field of high-end architectural color-coated steel sheets.

Pictured: Application of the ultra-thick paint film color-coated sheet project.

Ultra-thick fluorocarbon color-coated steel sheets are the "crown product" in the color-coated steel sheet industry. They have excellent durability and can effectively resist acid fog, acid rain, alkaline dust, industrial waste gas, sea salt spray and strong ultraviolet light. They are suitable for special working conditions such as coastal areas, chemical plants, power plants, and smelting plants, and can significantly extend the service life of building envelope systems. However, this product is developed in a customized manner for high-end factory projects, and similar materials are rare in China. It has extremely high requirements for production equipment and process control, and the production technology is very challenging.

Conventional color coating uses a two-coat, two-bake process, with a single-sided film thickness typically ranging from 15 to 20 μm. Doubling the film thickness to 40μm requires solving key process challenges such as high-viscosity coating, uniform leveling, and thick film curing, while ensuring surface quality and processing performance. After multiple discussions, the Shanxi Jianlong technical team developed a refined solution for the entire process, focusing on optimizing substrate quality, pretreatment, chemical coating, coating, and curing parameters. Ultimately, they achieved a front-side paint film thickness of 43μm with good adhesion, no paint peeling or cracking when bent, excellent corrosion resistance, and a salt spray test level of 4 or higher. This fully demonstrates Shanxi Jianlong's core advantages in the stable mass production of thick paint films, as well as its technological accumulation and manufacturing strength in the field of high-end color coating.

This product boasts rich and stable colors, including high-gloss, matte, and metallic finishes, and maintains its color over time, providing excellent decorative effects. It also possesses certain self-cleaning and stain-resistant properties, with low surface energy and hydrophobic and oleophobic properties, allowing rainwater to wash away most stains. In addition, it has excellent processing performance, is scratch-resistant and impact-resistant, and can be bent, pressed and sheared, making it suitable for processing various components; the coating does not contain heavy metals, the sheet is recyclable, and it is green and low-carbon. Compared to ordinary materials, it is more durable, safe and stable, and has a lower total life cycle cost, which is in line with the development direction of green industrial buildings under the "dual carbon" strategic goal.

Shanxi Jianlong Color Coating Products leverages the advantages of self-produced raw materials from its long-process steel mill, using 55% Al aluminum zinc (Prices) as the mainstream substrate (zinc layer thickness covers standard zinc layer to 250g/m² ultra-thick zinc layer). It adopts internationally leading Valspar paint and, after five years of dedicated research and development, has now formed a series of high-end and distinctive products such as fluorocarbon, high weather resistance, ultra-weather resistance, silicon modified, self-cleaning, and textured plates, and can achieve customized production of zinc layer and paint film thickness.

In the future, Shanxi Jianlong will adhere to driving industrial upgrading with quality and technological innovation, focusing on the iteration and technological innovation of high-end color coating products, cultivating higher-level functional products, overcoming core technical barriers such as corrosion resistance, weather resistance, heat insulation, and special coating, continuously expanding personalized application scenarios, constantly improving product competitiveness and brand influence, providing downstream industries with stable, reliable, green and low-carbon advanced materials and better solutions, and striving to create leading products in the domestic high-end functional color coating field.