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.
Claims14
1-12. (canceled)
13:
- A superhydrophobic asphalt comprising:
- an asphalt layer comprising a polymer modified asphalt;
- and
- a polypropylene layer comprising polypropylene granules thermally fused onto the asphalt layer, wherein:
- the superhydrophobic asphalt has a water contact angle of 145 to 170° and a Ra surface roughness of 10 to 50 μm;
- and
- the polymer granules are substantially free of fluoropolymers and have a maximum particle size of 177 μm.
14:
- The superhydrophobic asphalt of claim 13, 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.
15:
- The superhydrophobic asphalt of claim 13, wherein the polymer modified asphalt is an elastomer-type polymer modified asphalt.
16:
- The superhydrophobic asphalt of claim 15, wherein the elastomer-type modified asphalt is styrene-butadiene styrene (SBS)-modified asphalt.
17:
- The superhydrophobic asphalt of claim 16, wherein the styrene-butadiene-styrene is a radial styrene-butadiene-styrene and is present in an amount of 0.5 to 10 wt % based on a total weight of the styrene-butadiene styrene (SBS)-modified asphalt.
18:
- The superhydrophobic asphalt of claim 13, wherein the polypropylene layer is present in an amount of 50 to 125 g per m2 of polymer modified asphalt layer.
19:
- The superhydrophobic asphalt of claim 13, which is substantially free of silanes and/or siloxanes.
20:
- The superhydrophobic asphalt of claim 13, having a work of adhesion of 1 to 15 mN/m.
21:
- The superhydrophobic asphalt of claim 13, wherein most of the polypropylene granules are perpendicularly attached to a surface of the asphalt layer with respect to a flat surface of the polypropylene granules.
22:
- The superhydrophobic asphalt of claim 13, wherein the polypropylene granules are at least partially embedded in the asphalt layer.
23:
- The superhydrophobic asphalt of claim 13, wherein at least a portion of a surface of the asphalt layer is an outermost layer of the superhydrophobic asphalt and said portion is smoother than a surface of the same asphalt layer in the absence of the polypropylene granules.
24:
- The superhydrophobic asphalt of claim 13, wherein the polypropylene layer comprises 230±15 g/m2 of the polypropylene granules.
25:
- The superhydrophobic asphalt of claim 13, wherein the polypropylene granules are embedded in the asphalt layer and have a protrusion portion of 13.5 to 25% of the total size of the polypropylene granules.