| 摘要 |
<p>The elastomeric polyurethane interpenetrating network compositions of the invention are developed by in situ reaction of polyols with different isocyanates and polyisocyanates in bituminous material. Suitable bituminous materials include asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200° F. and 350° F. The reaction kinetics can be accelerated by including catalysts and curing agents.The reaction kinetics were followed by measuring the torque increase as a function of reaction time. The gelation time is measured at the maximum torque. For testing, the bituminous polyurethane interpenetrating network elastomeric compositions were hot-sprayed-applied (200° F.-350° F.) on different substrates such as concrete, metal, wood, built-up roofing systems, polyurethane foams, and other construction materials with a specially designed spray applicator system. The coated substrates were evaluated for their physical and mechanical properties, adhesion, static and dynamic puncture resistance, wind-up lift test, and other properties. Bituminous polyurethane interpenetrating network elastomer compositions of the invention are resistance to solvents, oil, and acid. Bituminous polyurethane interpenetrating network elastomers are suitable for a wide variety of applications including but not limited to roofing, new construction, and wall and foundation waterproofing applications.</p> |
