Rapid Cure Road Marking Paint Using UV LED Photopolymerization
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Solution Overview
Problem
Current road marking paints require significant time to dry, necessitating road closures for extended periods, and existing high-speed curing technologies using UV light are impractical due to the need for high-power, fragile light sources.
Innovation Solution
A road marking paint composition that can be cured in less than three seconds using a low-power LED light source, comprising multifunctional acrylate oligomer, functional monomers, a photoinitiator, thiol and/or mercaptan, and acid functional acrylate, along with optically transmissive components for enhanced UV penetration and retroreflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional road marking paint is used, then the paint can be applied to the road surface, but the paint requires up to 24 hours to fully cure, causing significant road closure time
Solution Approach 1:
The patent changes the chemical parameters of the paint formulation by incorporating photopolymerizable monomers and oligomers with specific functional groups (acrylate, epoxy, vinyl) that enable rapid polymerization. The paint composition includes initiators that activate polymerization under UV light, fundamentally changing the curing mechanism from slow evaporation to rapid chemical crosslinking, achieving cure times of seconds rather than hours
Solution Approach 2:
The patent replaces the natural drying/evaporation process with a photochemical polymerization system. Instead of relying on time-dependent solvent evaporation, the paint uses UV light activation to trigger rapid crosslinking reactions, substituting a passive physical drying process with an active chemical curing mechanism that can be initiated and controlled by light exposure
2Loss of time
If high-power UV light source is used to achieve rapid curing in 10-30 seconds, then the paint can be cured quickly, but the light source becomes fragile and requires enormous power
Solution Approach 1:
The patent optimizes the paint formulation parameters to match the output characteristics of LED UV light sources. By selecting photopolymerizable components with absorption spectra that align with LED emission wavelengths and adjusting the concentration of initiators and monomers, the system achieves effective curing with the lower power density of LEDs compared to fusion or arc lamps
Solution Approach 2:
The patent adopts LED UV light sources that are more durable and maintenance-friendly than fusion or arc lamps. While LEDs have lower power output, they offer significantly improved reliability, longer operational life, and reduced fragility, making them suitable for mobile road marking equipment where the light source must withstand vibration and frequent movement
3Productivity
If fusion or arc lamp is used for UV curing, then rapid curing can be achieved, but the lamp must be positioned very close to the paint (50 mm) and is easily broken by road bumps
Solution Approach 1:
The patent replaces fragile fusion or arc lamps with robust LED UV light sources that can tolerate vibration and movement. LEDs are solid-state devices with no fragile filaments or glass envelopes, making them resistant to damage from road bumps and eliminating the need for precise positioning at 50 mm distance from the paint surface
Solution Approach 2:
The patent enables the road marking vehicle to operate at normal speeds without requiring the vehicle to slow down or stabilize for lamp positioning. The LED light source maintains effective curing performance even with vehicle movement and vibration, providing a dynamic solution that adapts to the mobile operating environment rather than requiring static, precisely positioned equipment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The paint composition allows for rapid curing of road markings, reducing traffic disruption and the need for road closures, while also providing improved visibility and durability through retroreflective properties.
Implementation Method 1
a paint composition for painting a coating on a substrate adapted for accelerated cure by exposure to UV light
Implementation Method 2
comprising a paint formulation which includes: multifunctional acrylate oligomer; one or more of a multi and/or mono functional monomer; a photoinitiator
Implementation Method 3
a first optically transmissive component, comprising a material adapted for substantial transparency to incident light of at least 365 to 405 nm
Data Source
Figure 1
AI summary
The paint composition for painting a coating on a substrate adapted for accelerated cure by exposure to UV light. The composition of the paint includes a multifunctional acrylate oligomer in a concentration of between about 10 and 40% by weight; one or more of a multi and/or mono functional monomer of a concentration between about 15 and 50% by weight; a photoinitiator; thiol and/or mercaptan; and an acid functional acrylate. For road marking applications, the paint composition may also include optically transmissive materials and constituents to impart a particular colour to the paint.