Superhydrophobic asphalt/pp coating
AssigneeImam Abdulrahman Bin Faisal University
InventorMuhammad Abubakar Dalhat
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Abstract
A superhydrophobic asphalt and a method of its preparation. The superhydrophobic asphalt contains an asphalt layer containing a polymer modified asphalt, preferably a radial SBS modified asphalt, and a polypropylene layer. The polypropylene layer comprises granules of polypropylene thermally fused to the asphalt layer. The superhydrophobic asphalt has a water contact angle of 145 to 170°, above the classification threshold for superhydrophobicity. The method of preparing the superhydrophobic asphalt involves distributing polypropylene granules over the surface of a polymer modified asphalt and curing below the melting temperature of the polypropylene. The asphalt may find use in waterproofing applications such as roofing.
Claims13
A superhydrophobic asphalt comprising:
- an asphalt layer comprising a polymer modified asphalt,
- wherein the polymer modified asphalt has a softening point of 80 to 95° C., a viscosity at 135° C. of 1575 to 1650 cP, a ductility at 25° C. of 11.5 to 17.5 cm, a flash point of 300 to 360° C., and a performance grade of 76-10;
- and
- a polypropylene layer comprising polypropylene granules that are substantially free of fluoropolymers, having a maximum particle size of 177 μm, a minimum particle size of 100 μm, that are thermally fused onto the asphalt layer, wherein:
- the polypropylene layer is present in an amount of 50 to 125 g per m2 of polymer modified asphalt layer, has a Ra surface roughness of 10 to 50 μm, and the polypropylene particles are mostly attached to the asphalt surface perpendicularly, as opposed to sideways, the polypropylene granules are at least partially embedded in the asphalt layer, and
- wherein the superhydrophobic asphalt has a water contact angle of 145 to 170°, and a work of adhesion of 1 to 15 mN/m.
Dependencies are inferred from the claim text.