| 摘要 |
<p>An improved hydrophobic composite is prepared by depositing on a particulate or granular core material an adherent first coat comprising a film-forming polyurethane and, optionally, asphalt, and applying to the thus-coated core material a hydrophobic colloidal oxide, such as hydrophobic fumed silica. The composites are useful in various water-proofing applications, as well as in cleaning up oil spills. </p> |
