Color coated coil features

Pre-painted Steel Coil is a composite material formed by coating an organic coating on the surface of a metal substrate (such as galvanized sheet, aluminum sheet, etc.). Its characteristics can be analyzed from multiple dimensions such as material performance, functional advantages, and application characteristics. The following is a specific description:
I. Material performance characteristics: synergistic advantages of substrate and coating
1. Mechanical support of metal substrate
High strength and rigidity: Taking galvanized steel sheet as an example, the tensile strength of the substrate can reach 270-550MPa, ensuring that the components can withstand loads in scenes such as buildings and home appliances (such as roof load-bearing and equipment housing impact resistance).
Lightweight potential: By reducing the thickness of the substrate (such as 0.1-2.0mm), the weight can be reduced by 30%-50% compared with materials such as concrete and wood, which is suitable for weight-sensitive fields such as automobiles and aviation.
2. Functional enhancement of organic coatings
Diversification of anti-corrosion systems:
Primer: epoxy resin (EP) or polyester (PE), enhances adhesion to the substrate, isolates water vapor and oxygen;
Topcoat: select polyester (PE, economical and general), silicon-modified polyester (SMP, improved weather resistance), fluorocarbon (PVDF, super weather resistance), etc. according to needs to form a multi-layer protective structure.
Customized surface performance: antistatic agents, antibacterial agents, and self-cleaning factors (such as photocatalytic TiO₂) can be added to the coating to meet special needs such as antistatic for home appliances and antibacterial in medical places.
II. Core functional advantages: integrated solutions from protection to decoration
1. Excellent corrosion resistance
Multi-layer protection mechanism: The zinc layer (50-275g/m²) of the galvanized substrate protects the substrate through sacrificial anodes, and the surface coating further isolates the corrosive medium. The service life in coastal areas can reach 15-30 years (ordinary steel plates are only 5-8 years).
Strong environmental adaptability:
Salt spray resistance: zinc aluminum magnesium substrate + fluorocarbon coating tested in 5% NaCl solution, no rust for 1000 hours;
Acid and alkali resistance: In corrosive environments such as chemical plants, epoxy resin coatings can resist erosion by sulfuric acid and hydrochloric acid gases.
2. Long-term appearance durability
Color and texture stability:
The weather resistance level of high weather-resistant coatings (such as PVDF) reaches ISO 105-B02 level 8, and the color difference ΔE <5 after 10 years of outdoor exposure (ordinary coatings only 3-5 years);
Textures such as imitation wood grain, stone grain, and metal brushing can be customized to replace natural materials (such as stone and wood), reduce costs and avoid resource consumption.
3. Efficient processing and construction performance
Molding adaptability: The coating flexibility reaches T-bend 0-3 level (the smaller the T-bend value, the better the bending performance), which can meet the processing needs of stamping, rolling, bending, etc. (such as stamping of home appliance shells and rolling forming of building roof tiles).
Convenience of construction: prefabricated panels can be installed directly, reducing the on-site painting process and improving construction efficiency by more than 50% (such as steel structure factory roof installation).
III. Application characteristics: flexible attributes for multi-scenario adaptation
1. Balance between function and cost
Cost-effectiveness advantage: compared with stainless steel (cost reduction of 30%-60%) and aluminum plate (cost reduction of 40%-70%), color-coated coils meet the needs of anti-corrosion and aesthetics while being price competitive, especially suitable for large-scale projects (such as industrial plants, warehousing and logistics).
Low maintenance cost: the self-cleaning function of the coating (such as anti-fouling coating) reduces the frequency of manual cleaning, and outdoor buildings do not need to be renovated for 10-15 years.
2. Environmental protection and sustainability
Low VOC emissions: the coating adopts a roller coating process, and the VOC (volatile organic compound) emissions are only 1/10 of traditional spraying, which meets environmental protection standards (such as China GB 30981-2020).
Recyclability: The metal substrate is 100% recyclable, and no toxic gas is released when the coating is incinerated (for example, PVDF coating requires professional treatment, while PE coating can be incinerated conventionally), which meets the needs of the circular economy.