1.What is the basic performance of thermal insulation of color coated coils?
Limited basic insulation capacity
The thermal insulation of ordinary color-coated coils mainly depends on the coating's ability to reflect solar radiation, rather than blocking heat transfer through low thermal conductivity like thermal insulation materials. The metal substrate itself has strong thermal conductivity. If it is only a single-layer structure, heat is easily conducted through the substrate, and the thermal insulation effect of the coating alone is relatively limited.
The improvement effect of functional coatings
If heat-insulating color-coated coils are used, special coating formulas can reflect part of the sun's short-wave radiation, reduce heat absorption, and thus reduce the temperature conduction on the surface and inside of the substrate. In high temperature environments, this type of color-coated coil can reduce the surface temperature by 5-15℃ compared to ordinary products.
2.How does coating formula affect the thermal insulation performance of color coated coils?
Reflective pigments: Adding titanium dioxide (white), aluminum powder, zinc oxide, etc. can increase the reflectivity of visible light and infrared rays and reduce heat absorption.
Thermal insulation fillers: Hollow glass microspheres, ceramic microspheres, etc. are added to the coating to reduce the thermal conductivity of the coating by using their low thermal conductivity and air insulation principle.
Coating thickness: Properly increasing the thickness of the thermal insulation coating (usually 10-30μm) can enhance the reflection and barrier effects, but the coating adhesion and processability need to be balanced.
3.How does the substrate type affect the thermal insulation performance of color coated coils?
The thermal conductivity of the metal substrate directly affects the overall thermal insulation. The thermal conductivity of the aluminum substrate is higher than that of the steel substrate, but aluminum is lighter and more corrosion-resistant, which can be compensated by the composite structure in practical applications.
If a composite substrate is used to form a composite board of "color-coated coil + insulation layer", the thermal insulation performance will be greatly improved. At this time, the thermal insulation mainly depends on the core material, and the color-coated coil plays a more protective and decorative role.
4.How do color and surface treatment affect the thermal insulation performance of color coated coils?
Light-colored coatings (such as white and light gray) have a higher reflectivity to solar radiation (up to 70%-80%), absorb less heat, and have better insulation effect than dark-colored coatings (dark-colored coatings usually have a reflectivity of less than 30% and are prone to heat absorption).
Smooth-surface coatings are more likely to reflect light than rough surfaces, reducing heat retention.
5.What are the differences in thermal insulation effects in application scenarios?
Construction: When used on roofs or exterior walls, heat-insulating color-coated coils can reduce the amount of outdoor heat transferred into the room and reduce air conditioning energy consumption, especially in high-temperature areas.
Industrial: In equipment housings, pipeline protection and other scenarios, the housing is mainly protected from overheating by reflecting radiant heat, rather than blocking internal heat leakage.
Note: The thermal insulation performance of color-coated coils cannot replace professional insulation materials (such as rock wool and polystyrene boards). If high-strength insulation is required, it must be used in combination with an insulation layer (such as color-coated steel sandwich panels).