| 摘要 |
Air is mechanically entrained in a dyed or colored, aqueous solution comprising surfactant, poly(oxyalkylene) polyisocyanate prepolymer and the reaction product of said prepolymer and one or more isocyanate-reactive dyes, the poly(oxyalkylene) portion of said prepolymer containing sufficient oxyethylene units to render the prepolymer and the reaction product water-soluble and hydrophilic, to form a dyed or colored, fluid, aqueous air foam which is sprayed or otherwise applied to exposed surface of a substrate, e.g. a sanitary landfill, the applied foam gelling or increasing in viscosity, due to the polymerization, e.g., by reaction with water or polyamine, of the prepolymer and the reaction product, to form a dyed or colored, poly(oxyalkylene) polyurea polymer, forming a persistent, dyed or colored, gelled or viscous air foam in the form of a coating on the exposed surface, thus sealing or otherwise protecting or controlling the substrate and coloring the substrate making it more visible, decorative, or less visible, thereby camouflaging the substrate. |
