Styrene butadiene latex mainly plays the following roles in emulsified asphalt, significantly improving the performance and application effect of asphalt:
1. Enhance adhesion and cohesion
The polymer molecules of styrene butadiene latex can form a network structure with asphalt, improve the adhesion between asphalt and aggregates (such as stones and sand), reduce the risk of peeling, and are particularly suitable for environments with high humidity or large temperature differences.
2. Improve flexibility and crack resistance
The elasticity of SBR can enhance the flexibility of asphalt, reduce low-temperature brittleness and high-temperature flow, extend the service life of road surfaces, and is particularly suitable for areas with large temperature differences.
3. Improve durability
Emulsified asphalt with added styrene butadiene latex is more resistant to UV oxidation, moisture erosion, and traffic loads, reducing aging and cracking, and extending maintenance cycles.
4. Optimize emulsion stability
Surfactants in latex help stabilize asphalt emulsions and prevent delamination or emulsion breaking before storage or construction.
5. Enhance the ability to resist water damage
Polymer film can block moisture infiltration and reduce water damage (such as peeling and potholes), making it suitable for rainy areas or poorly drained road surfaces.
6. Improve construction performance
Improve the flowability, wettability, and coating uniformity of emulsified asphalt, making construction more convenient, especially in thin layer paving or crack repair.
7. Typical application scenarios
Road engineering: used for slurry sealing, micro surfacing, adhesive layer oil, etc., to improve the crack resistance and durability of road surfaces.
Building waterproofing: As a base material for waterproof coatings, it enhances the elasticity and bonding strength of the waterproof layer.
Crack repair: After filling the crack, it is not easy to recur and adapts to the expansion and contraction of the substrate.
8. Mechanism of action
Styrene butadiene latex forms a polymer asphalt interpenetrating network through physical blending and chemical cross-linking, thereby comprehensively improving its performance.
In summary, styrene butadiene latex is an efficient modifier for emulsified asphalt, targeting the shortcomings of traditional asphalt and expanding its application range in harsh environments.
