Energy-saving and aesthetic solutions for the combination of galvanized steel and color-coated steel in building exterior walls
Release time:
2025-07-22
Energy-saving and aesthetic solutions for the combination of galvanized steel and color-coated steel in building exterior walls
Ⅰ. Material properties and combination advantages
The innovative combination of galvanized steel (substrate layer) and color-coated steel (finishing layer) is reshaping the standard of modern building exterior walls. The galvanized layer provides excellent anti-corrosion performance (zinc layer thickness ≥ 120g/㎡), and the color coating layer achieves a durable performance of 20-year color retention ΔE<5 through PVDF fluorocarbon coating. The combination of the two forms a "metal composite protection system", and its advantages are reflected in:
Thermal reflectivity is increased by 40% (compared to a single material)
The thermal conductivity is reduced to below 0.5W/(m·K)
The self-weight is reduced by 60% compared to traditional curtain walls
Ⅱ. Energy-saving technology implementation path
Sandwich insulation system: fill rock wool/polyurethane insulation board (thickness 50-100mm) between the double metal layers to form a continuous insulation layer, and the measured heat transfer coefficient U value can reach 0.35W/(㎡·K)
Breathing structure: through the patented fastener system (spacing ≤ 600mm) forms a 3-5cm air layer, which can reduce the surface temperature by 8-12℃ in summer
Photovoltaic integration solution: Color-coated steel surface can be customized to integrate thin-film solar cells (conversion efficiency ≥17%)
III. Aesthetic design and market application
Digital printing technology can achieve:
200+ standard color selection
Three-dimensional textures such as imitation wood grain/stone (resolution ≥1200dpi)
Modular splicing art patterns
Global market data shows that the export volume of this combination material has increased by 15% annually, and is particularly suitable for: ✓ Green building certification projects (LEED/WELL) ✓ Commercial complex facade renovation ✓ Buildings in extreme climate areas
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