Special Requirements for Tunnel Markings: Optimizing Slip Resistance & Reflectivity of Thermoplastic Paint
Tunnel markings demand enhanced safety features due to low light, high humidity, and frequent braking. Thermoplastic paint, when optimized for anti-slip and reflectivity, meets these challenges effectively. Here’s how:
1. Anti-Slip Performance
Aggregate Integration: Large-particle additives (e.g., 2–3mm ceramic or quartz aggregates) are mixed into thermoplastic paint to create a rough surface, increasing friction by 30% and reducing wet-road skidding.
Constructed Depth: A 4–5mm thickness ensures durability and consistent slip resistance under heavy traffic.
2. Reflectivity Optimization
Dual-Layer Glass Beads: High-refractive-index glass beads (1.5+折射率) are embedded both within the paint (15–23% content) and surface-sprinkled (0.34kg/m²) to maintain reflectivity even after surface wear.
Fluorescent Brighteners: Additives like benzotriazole compounds prevent yellowing and boost nighttime visibility by 60%.
3. Tunnel-Specific Adaptations
Humidity Resistance: Modified resins (e.g., aliphatic TPU) resist moisture-induced degradation.
Quick-Drying Formula: Sets in <3 minutes to minimize tunnel traffic disruption.
Future Trends: Smart tunnels may integrate LED-enhanced thermoplastics for dynamic guidance.
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