I. Definition and Classification

Medium-temperature asphalt liquid refers to asphalt materials with a softening point between 70℃-90℃, lying between low-temperature asphalt (softening point <70℃) and high-temperature asphalt (softening point >90℃). Depending on the source and processing technology, they can be categorized into:

• Coal Tar Middle Temperature Asphalt: Processed from coal tar, containing a high amount of resin and asphaltene.
• Medium-temperature asphalt from petroleum: Processed from petroleum distillation residues, it offers good stability and weather resistance.

II. Production Process

The production process for medium-temperature asphalt liquid primarily includes the following steps:

1. Raw Material Selection: Coal tar or petroleum distillation residue is used as the raw material.
2. Heating Treatment: Heat the raw material to a certain temperature to melt it and remove moisture and light components.
3. Distillation Cutting: Separates various fractions through a distillation tower to obtain intermediate-temperature asphalt.
4. Blended Modification: Add modifiers such as polymers and rubber powder as needed to enhance performance.
5. Filter Packaging: After filtration of impurities, the product is filled into barrels or stored in tanks.

III. Performance Features

Medium-temperature asphalt liquid boasts the following performance characteristics:

1. Moderate viscosity: Good flow, easy to apply, suitable for various application techniques.
2. Excellent adhesion: firmly bonds with aggregates, fibers, and other materials, enhancing the overall performance of the material.
3. Medium softening point: Maintains stability at room temperature, resists flow at high temperatures, and resists cracking at low temperatures.
4. High weather resistance: Good tolerance to environmental factors such as ultraviolet rays and oxidation.

Section 4: Application Fields

Medium-temperature asphalt liquid finds wide application in various fields:

1. Road Engineering:

• Bitumen Mixture: Serves as the base asphalt for road asphalt mixtures, enhancing the road's resistance to rutting and durability.
• Emulsified Asphalt: Made through emulsification process, emulsified asphalt is used for slurry seal, prime coat oil, etc.

1. Waterproof materials:

• Waterproof Membrane: Acts as a base material or additive for waterproof membranes to enhance their performance.
• Waterproof Paint Coating: Used for producing waterproof paint coatings, enhancing the bond strength and water resistance of the coating.

1. Building Adhesive:

• Tile Adhesive Additive: Enhances the bonding strength of tile adhesives.
• Sealing Materials: Used for sealing building gaps to prevent leakage.

1. Other Fields:

• Corrosion-resistant materials: Used for the anti-corrosion treatment of pipelines and equipment.
• Carbon materials: Serve as a binder for carbon products, enhancing their mechanical strength.