A method of preparing a seamless membrane over a flat or low-sloped roof, the method comprising applying multiple layers of a liquid coating composition over a roof surface, where said step of applying includes applying at least one layer of a liquid coating composition that includes expandable graphite.

Disclosed are a hydroxyl-terminated polybutadiene-based polyurethane (HTPB-PU)-modified asphalt and a preparation method thereof. In the disclosure, the HTPB-PU-modified asphalt includes the following components in parts by weight: 90 parts to 97 parts of a base asphalt and 3 parts to 10 parts of HTPB-PU, where the HTPB-PU is prepared from raw materials including an isocyanate and a polyol, and the polyol includes hydroxyl-terminated polybutadiene (HTPB) with a weight percentage of not less than 80%.

A polyurethane is obtained by continuously reacting a polyurethane prepolymer in an asphalt or asphalt mixture material system under high temperature. The prepolymer is prepared by: adding a polymerization inhibitor, catalyst and isocyanate component in a reaction container, adding a polyol to the reactor while stirring at room temperature under nitrogen, increasing the temperature to 50-80 C., and maintaining the temperature to react for 0.5-6 hours. A polyurethane modified asphalt, a mixture material containing the polyurethane and a polyurethane modified asphalt pavement structure can be prepared. The synthesis condition of the polyurethane is mild, and a secondary reaction with the air and an active hydrogen component in the asphalt can occur during maintenance and formation to further increase the strength of a mixture material. The standard Marshall stability at 60 C. meets the petroleum asphalt requirement, such that a service life of the asphalt pavement can be increased.

A method of preparing a seamless membrane over a flat or low-sloped roof, the method comprising applying multiple layers of a liquid coating composition over a roof surface, where said step of applying includes applying at least one layer of a liquid coating composition that includes expandable graphite.

Disclosed are a hydroxyl-terminated polybutadiene-based polyurethane (HTPB-PU)-modified asphalt and a preparation method thereof. In the disclosure, the HTPB-PU-modified asphalt includes the following components in parts by weight: 90 parts to 97 parts of a base asphalt and 3 parts to 10 parts of HTPB-PU, where the HTPB-PU is prepared from raw materials including an isocyanate and a polyol, and the polyol includes hydroxyl-terminated polybutadiene (HTPB) with a weight percentage of not less than 80%.

A method of preparing a seamless membrane over a flat or low-sloped roof, the method comprising applying multiple layers of a liquid coating composition over a roof surface, where said step of applying includes applying at least one layer of a liquid coating composition that includes expandable graphite.

An asphalt-urethane composition is disclosed which does not contain any of specific chemical substances, has adhesiveness to mineral-surfaced asphalt roofing and an asphalt groundwork, exhibits performance in temporary waterproofing with respect to the asphalt groundwork, performs adhesion of sand to the surface layer of the mineral-surfaced asphalt roofing and adjustment of irregularity, has adhesiveness of integrating with a urethane waterproof layer applied thereon, has excellent workability, construction efficiency, water resistance, and hot water resistance, has high strength and elasticity, has low temperature sensitivity, and has excellent finish properties. The asphalt-urethane composition can contain at least a component (A) obtained by adding an MDI prepolymer generated by reacting polyolefin polyol having two or more hydroxyl groups, short-chain polyhydric alcohol, and a monomer of MDI, a monomer of MDI, and a solvent a; and a component (B) including asphalt, a catalyst, and a solvent b.

An asphalt-urethane composition is disclosed which does not contain any of specific chemical substances, has adhesiveness to mineral-surfaced asphalt roofing and an asphalt groundwork, exhibits performance in temporary waterproofing with respect to the asphalt groundwork, performs adhesion of sand to the surface layer of the mineral-surfaced asphalt roofing and adjustment of irregularity, has adhesiveness of integrating with a urethane waterproof layer applied thereon, has excellent workability, construction efficiency, water resistance, and hot water resistance, has high strength and elasticity, has low temperature sensitivity, and has excellent finish properties. The asphalt-urethane composition can contain at least a component (A) obtained by adding an MDI prepolymer generated by reacting polyolefin polyol having two or more hydroxyl groups, short-chain polyhydric alcohol, and a monomer of MDI, a monomer of MDI, and a solvent a; and a component (B) including asphalt, a catalyst, and a solvent b.

An asphalt composition comprising 0.1 to 8 wt.-% based on the total weight of the composition of an Isocyanate as thermosetting reactive compound and 0.1 to 8 wt.-% based on the total weight of the composition of a polymer selected from the group consisting of styrene/butadiene/styrene copolymer (SBS), styrene butadiene rubber (SBR), neoprene, polyethylene, low density polyethylene, oxidized high density polyethylene, polypropylene, oxidized high density polypropylene, maleated polypropylene, ethylene-butyl-acrylate-glycidyl-methacrylate terpolymer, ethyl vinyl acetate (EVA) and polyphosphoric acid (FRA).