Coal asphalt manufacturer Chaisha
Modified asphalt is an asphalt material with specific physical and chemical properties prepared by solvent deoiling, oxidative dehydrogenation, polymerization and other processes with medium-temperature asphalt as raw material. Because of its high viscosity, high stability, high thermal stability and good anti-aging properties, it is widely used in road construction, waterproof materials, packaging materials and other fields.
1. Composition and properties.
Modified asphalt is mainly composed of carbon, hydrogen, oxygen, nitrogen and other elements, of which carbon and hydrogen are the main components, accounting for most of the quality of modified asphalt. Modified asphalt has a dark black appearance, high viscosity, and poor fluidity. Compared with ordinary asphalt, modified asphalt has a higher softening point, lower penetration, and better resistance to high temperatures. In addition, modified asphalt also has good oxidation resistance and anti-aging properties, and can remain stable under high temperature and strong ultraviolet conditions.
Second, production methods and processes.
The production methods of modified asphalt mainly include solvent deoiling, oxidative dehydrogenation and polymerization. Among them, oxidative dehydrogenation is a key link in the production of modified asphalt, which usually uses air or oxygen as an oxidant, and carries out oxidation reaction at a certain temperature and pressure, so that the light components in the medium temperature asphalt are converted into aromatic hydrocarbons and a small amount of gum. The polymerization process is to further improve the physicochemical properties of modified asphalt, usually using monomers such as styrene or propylene for polymerization reaction.
Third, the field of application.
1. Road construction: Modified asphalt is widely used in road construction because of its good high temperature resistance and stability. For example, highways, airport runways, and other occasions that require high durability and stability.
2. Waterproof material: modified asphalt has good waterproof performance and aging resistance, and can be applied to roof, basement and other waterproof projects.
3. Packaging materials: Because modified asphalt has good toughness and high temperature resistance, it is also used in the production of packaging materials. For example, high-temperature food packaging bags, etc.
4. Other fields: modified asphalt can also be used in marine coatings, chemical anti-corrosion and other fields.
4. Challenges and future development trends.
At present, the modified asphalt market is facing problems such as high production costs and environmental pollution. In order to reduce production costs and improve product quality, it is necessary to continuously explore new production processes and technologies. In the future, with the improvement of environmental awareness and technological progress, the production and application of environmentally friendly modified asphalt will become the mainstream. In addition, with the development of road construction and the improvement of waterproofing requirements, the demand for modified asphalt will also grow. Therefore, improving product quality, reducing production costs and strengthening product research and development will be an important development direction for modified asphalt in the future.