How Thermoplastic Road Marking Paint Works: The Synergy of Resin, Glass Beads, and Fillers
Thermoplastic road marking paint achieves high durability and reflectivity through the coordinated action of three core components:
Resin (15–20%)
As the binder, thermoplastic resin (e.g., petroleum or modified rosin resin) melts at 180–220°C, forming a viscous liquid that adheres to the pavement. Upon cooling, it solidifies into a tough film, providing mechanical strength and weather resistance. Its thermal plasticity enables fast drying (<5 minutes) and strong bonding with road surfaces.
Glass Beads (15–23%)
Embedded glass beads (75–1400 μm) refract and reflect light from vehicle headlights, ensuring nighttime visibility. Optimal reflectivity occurs when 50–60% of each bead is embedded in the resin layer. Pre-mixed beads ensure long-term reflectivity, while surface-sprinkled beads offer immediate brightness.
Fillers (47–66%)
Minerals like calcium carbonate and quartz sand enhance abrasion resistance, adjust viscosity, and reduce costs. They also improve thermal stability and prevent cracking under traffic stress.
Synergy: The resin binds fillers for structural integrity, while glass beads amplify retroreflectivity. Together, they create a balance of durability, safety, and cost-efficiency for roads.
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