Novel polymer technology for maintaining refelctance efficiency in bitumen cool roofs

 
The ability to reflect infrared light, thereby reducing the energy consumption required to cool buildings has become an important property for roof coatings. This is typically achieved in bitumen roofs when a white pigmented coating is applied over the bitumen. If the binder is unable to prevent bleed-through of the underlying bitumen, the coating will lose its whiteness resulting in a loss of reflectance. This presentation will provide an overview of different components of the coating and the effect they have on properties such as tensile strength,elongation,adhesion,water resistance,flexibility and bitumen bleed-through resistance. Test data will be presented, demonstrating correlations between different additives employed and the film properties being tested. A particular emphasis will be placed on the effect of formulation parameters on adhesion and asphalt bleed-through resistance.