Recycled PVB Clear Binder for Low-Temperature Road Coatings
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Solution Overview
Problem
Existing clear binders used in road and urban development surfacings, such as bituminous coatings, emit significant fumes due to high manufacturing and application temperatures, and there is a need for a lower-temperature, environmentally friendly alternative that maintains mechanical and rheological properties while providing aesthetic clarity.
Innovation Solution
A clear binder comprising recycled plasticized polyvinyl butyral (PVB) particles and vinyl polymers with distinct glass transition temperatures, mixed with an anionic surfactant, allows for the preparation of clear asphalt mixes at lower temperatures, offering rigidity, flexibility, and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high manufacturing temperatures (150°C to 200°C) are used to achieve good fluidity and workability of clear binders, then the coating can be properly applied, but significant fume emissions occur which increase environmental impact and reduce safety
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (150-200°C) to low temperatures (below 40°C, preferably 15-30°C). This is achieved by using a binder composition based on recycled plasticized PVB particles (20-50 wt%) combined with vinyl polymer particles having specific glass transition temperatures, replacing traditional bituminous or petroleum-based binders that require high temperatures for proper fluidity and application.
2Strength
If conventional clear binders composed of petroleum oils and resins are used, then the binder provides adequate mechanical properties, but the orange/brown color alters the natural color of aggregates and reduces aesthetic clarity
Solution Approach 1:
The patent creates a composite binder system combining recycled plasticized PVB particles (providing flexibility and adhesion) with vinyl polymer particles having specific Tg ranges (providing structural integrity and rigidity). This composite approach allows the binder to maintain adequate mechanical properties while remaining clear and translucent, thus preserving the natural color of aggregates.
Solution Approach 2:
The patent recycles PVB particles from waste laminated glass, transforming a waste material into a valuable binder component. This recovered material provides both functional performance (flexibility, adhesion) and aesthetic clarity, replacing petroleum-based binders that discolor aggregates.
3Object-generated harmful factors
If cold production techniques (15°C to 40°C) are used to reduce energy consumption and environmental impact, then fume emissions are minimized, but the binder lacks sufficient fluidity and workability for proper application
Solution Approach 1:
The patent modifies the rheological parameters of the binder by carefully selecting the glass transition temperatures of the vinyl polymer particles. By using vinyl polymers with Tg between -50°C to 0°C (for flexibility) and -20°C to 50°C (for rigidity), the binder achieves optimal fluidity and workability at cold application temperatures (15-30°C) without requiring high temperatures that would generate fumes.
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 binder provides translucent, low-fume coatings with optimal mechanical properties, reducing the carbon footprint and enhancing safety through improved readability and visual differentiation in urban spaces.
Implementation Method 1
A clear binder comprising water, an anionic surfactant, particles based on recycled plasticized polyvinyl butyral (PVB) and particles comprising a vinyl polymer other than PVB
Implementation Method 2
at least a portion of the particles comprising a vinyl polymer other than PVB are comprised of at least two polymers having distinct glass transition temperatures (Tg), such that a positive gradient of Tg is observed from the surface of the particles towards the center of the particles
Data Source
AI summary
The present invention relates to the field of road and urban development surfacings, in particular clear or colored surfacings with clear binders. More particularly, the present invention relates to a clear binder comprising recycled plasticized PVB particles and vinyl polymer particles other than PVB. The present invention also relates to clear road or urban development coatings comprising such a binder as well as to road and urban development surfacings comprising the coatings of the invention.