I. Characteristics of Modified AsphaltCoal tar

1. High-Temperature Stability
2. The 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. The coking value reflects the asphalt's ability to form coke at high temperatures. The modified asphalt has a higher coking value, which helps improve the mechanical strength and electrical conductivity of carbon products.
5. Strong bonding properties
6. The modified asphalt contains a high β-resin content (≥18%), which boasts excellent adhesive properties and enhances 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 service life.

2. Modified Asphalt Production Process

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

1. Hot Melt Method
2. Produced from medium-temperature asphalt, this process involves continuous heating in a reaction vessel to release small molecular gases, with the remaining liquid being the modified asphalt. The method is simple in terms of technology, yet the product performance is relatively lower.
3. Heavy residual oil upgrading and refining integrated process method
4. The dehydrated tar is pressurized (0.5-2 MPa) in the reactor and heated to 320-370°C, maintaining for 5-20 hours to cause the heavy oil fractions and low-boiling, unstable components in the tar to polymerize, forming high-quality modified 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 as a binder and impregnating agent for the anode.
• High-power electrode rods: Used in electric furnace steelmaking to increase the power and efficiency of the furnace.
• Carbon bricks: Used as lining for high-temperature equipment like blast furnaces and electric furnaces, enhancing their resistance to high temperatures.

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., offering excellent waterproofing performance.

1. Industrial Corrosion Protection

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

1. Fuel oil

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

IV. Advantages of Modified Asphalt

1. Enhance product quality
2. The high-temperature stability and adhesion of the modified asphalt can significantly enhance the mechanical strength, electrical 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 improve the yield of finished products.
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. Reprocessed asphalt, through optimized production processes, has reduced emissions of harmful substances, meeting environmental protection requirements.

V. Trends in Modified Asphalt Development

1. Technological Innovation
2. As technology advances, the production process of modified asphalt will continuously improve, and the product quality will be further enhanced.
3. Application Expansion
4. Modified asphalt will continue to expand its applications in new energy and new material fields, meeting more industrial demands.
5. Increased environmental standards
6. Future production of modified asphalt will place greater emphasis on environmental protection and reduce its impact on the environment.
7. Market demand is increasing.
8. With the rapid development of industries such as electrolytic aluminum, steel, and road construction, the market demand for modified asphalt will continue to grow.