Spraying system for the restoration of resin-bound paved and block paved surfaces

摘要

The spraying system comprises a pressurised container and a liquid formulation within the container. The formulation comprises 30-80 (40-70)% moisture cure, aliphatic, polyurethane pre-polymer, 1-15 (5-12)% crosslinking agent and polyurethane compatible liquid propellant. The crosslinking agent is preferably a bisoxazolidine. The preferred formulation also includes 10-50% polar solvent, an organotin catalyst, acidifying agent, fungicide, ultraviolet (UV) protector and antioxidant. Preferred propellants are dimethyl ether, propane butane mixture and liquid nitrogen. The system is used for the restoration of (preferably pressure washed) resin bound paved and block paved surfaces, preferably by spraying at 10-20 bar.