I. Characteristics of modified asphaltCoal tar

1. High-Temperature Stability
2. Modified asphalt has a higher softening point (usually between 100-115℃), which maintains stability in high-temperature environments and is not prone to softening or flowing.
3. High coking value
4. Coking value reflects the asphalt's ability to form coke at high temperatures. The modified asphalt has a higher coking value, which aids in enhancing the mechanical strength and conductivity of carbon-based products.
5. Strong adhesive properties
6. The modified asphalt contains a high β-resin content (≥18%), offering excellent bonding properties and enhancing the internal bonding strength of carbon products.
7. Chemical stability
8. Low impurity content in modified asphalt, good chemical stability, reduces volatilization and decomposition at high temperatures, extending its service life.

Section 2: Production Process of Modified Asphalt

The production of modified asphalt primarily involves the following two methods:

1. Thermal Agglomeration
2. Using medium-temperature asphalt as raw material, it is continuously heated in a reactor to release small molecular gases, leaving the remaining reactor liquid as the modified asphalt. This method is simple in process, but the product performance is relatively low.
3. Heavy residue upgrading and refining integrated process
4. The dehydrated asphalt is pressurized (0.5-2 MPa) in a reactor and heated to 320-370°C, maintaining the temperature for 5-20 hours to cause the heavy oil fractions and low boiling point unstable components in the asphalt to polymerize, forming high-quality upgraded asphalt. This method yields a higher production rate and superior product quality.

Section 3: Applications of Modified Asphalt

1. Carbon Industry

• Graphite electrodes: Used in arc furnaces for aluminum electrolysis and other industries, serving as a binder for electrodes.
• Pre-baked anode: Used in the aluminum electrolysis industry, serving as a binder and impregnant for the anode.
• High-power electrode rods: Used for electric furnace steelmaking, to enhance the power and efficiency of the electric furnace.
• Carbon bricks: Used as refractory lining for equipment such as blast furnaces and electric furnaces, enhancing their high-temperature resistance.

1. Road Construction

• Modified Asphalt: By adding modifiers (such as SBS, rubber, etc.) to the base asphalt, it enhances the asphalt's resistance to rutting, aging, and low-temperature cracking, thereby extending the service life of roads.

1. Waterproof materials

• Waterproof membrane: Used for roofing, basements, tunnels, etc., providing excellent waterproofing performance.

1. Industrial Corrosion Prevention

• Corrosion-Resistant Coatings: Used for equipment anti-corrosion in oil & chemical, electric power, water conservancy and other fields, extending the service life of the equipment.

1. Fuel oil

• High Calorific Fuel: Refined asphalt can be used as fuel oil, suitable for various combustion equipment.

Section 4: Advantages of Modified Asphalt

1. Enhance product quality
2. The high-temperature stability and adhesion of modified asphalt can significantly enhance the mechanical strength, conductivity, and corrosion resistance of carbon products.
3. Reduce production costs
4. Using modified asphalt can reduce smoke emissions during the production process, decrease environmental pollution, and simultaneously enhance the finished product yield.
5. Extend service life
6. The superior properties of modified asphalt significantly extend the service life of carbon products, roads, and waterproofing materials, reducing maintenance and replacement frequency.
7. Excellent environmental performance
8. Refined asphalt reduces harmful emissions through optimized production processes, meeting environmental protection standards.

V. Trends in Modified Asphalt Development

1. Technological Innovation
2. With technological advancements, the production process of modified asphalt will continually improve, leading to further enhancement of product quality.
3. Application Expansion
4. Modified asphalt will continuously expand its applications in new energy and new material fields, meeting more industrial demands.
5. Enhanced environmental requirements
6. Future production of modified asphalt will place greater emphasis on environmental protection, reducing its impact on the environment.
7. Market demand is increasing
8. As the rapid development of industries such as electrolytic aluminum, steel, and road construction continues, the demand for modified asphalt will sustain growth.