Hot-melt Road Marking Paint with Recycled PET
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Solution Overview
Problem
Conventional hot-melt road marking paints lack optimal combinations of components for achieving fast drying, wear resistance, diffusive reflectivity, and strong peel strength while also being cost-effective and environmentally friendly.
Innovation Solution
A road marking paint composition comprising 8-15% titanium dioxide, 25-45% glass beads, 20-42% calcium carbonate, 18-23% binder, and 1-5% polyethylene terephthalate (PET) is developed, where PET replaces some silica glass beads and filler, enhancing mechanical strength and visibility with recycled plastic sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hot-melt road marking paint uses traditional components (pigment, silica, filler, binder), then the paint can be applied and solidified, but it lacks optimal wear resistance, reflectivity, and peel strength
Solution Approach 1:
The patent uses a composite material system combining polyester resin binder with specific ratios of titanium dioxide (8-15%), glass beads (25-45%), calcium carbonate (20-42%), and polyethylene terephthalate (1-5%). This composite composition resolves the contradiction by providing enhanced wear resistance and mechanical strength through the synergistic combination of materials, while the standardized formulation approach maintains ease of manufacture.
Solution Approach 2:
The patent optimizes the quantitative parameters of each component within specific ranges to achieve optimal performance. By controlling the weight percentages of titanium dioxide, glass beads, calcium carbonate, binder, and PET within defined ranges, the formulation achieves both improved reliability (wear resistance, peel strength) and manufacturing feasibility through parameter optimization rather than complex composition design.
2Strength
If the road marking paint requires fast drying and strong peel strength, then the performance is improved, but the formulation becomes more complex and costly
Solution Approach 1:
The patent achieves improved peel strength and fast drying performance by optimizing the binder content (18-23% polyester resin) and incorporating polyethylene terephthalate (1-5%). This parameter optimization approach provides strong adhesion and rapid drying within a standardized formulation framework, avoiding the need for complex multi-component systems while meeting performance requirements.
3Illumination intensity
If glass beads and filler are used for reflectivity and mechanical strength, then the functional properties are improved, but the production cost increases
Solution Approach 1:
The patent optimizes the ratio of glass beads (25-45%) to calcium carbonate filler (20-42%) to achieve cost-effective reflectivity. By controlling the glass bead content within this range, the formulation provides adequate diffusive reflectivity for road markings while balancing production costs, avoiding excessive use of expensive glass beads while maintaining necessary optical properties.
4Quantity of substance
If polyethylene terephthalate is used to replace silica glass beads and filler, then waste plastics are reduced and production costs decrease, but the mechanical strength may be compromised
Solution Approach 1:
The patent creates a composite system where polyethylene terephthalate (1-5%) works synergistically with the polyester resin binder and glass beads to maintain mechanical strength. The PET particles are dispersed throughout the matrix, providing reinforcement and contributing to wear resistance while reducing the need for expensive glass beads and fillers, thus achieving both cost reduction and adequate mechanical performance.
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 composition provides improved wear resistance, fast drying, and enhanced reflectivity while reducing waste plastics and production costs through the use of recycled PET, resulting in a more sustainable and effective road marking paint.
Implementation Method 1
Essential components of conventional melt-bonding (or hot-melt) road marking paint include a pigment, a silica, a filler, and a binder
Implementation Method 2
Silica glass beads, which are generally colorless and transparent, provide light refraction, focusing and directional reflection
Implementation Method 3
Melt-bonding road marking paint typically comes in a powder form. Before application, the road marking paint powder is initially melted in a hot melt kettle
Implementation Method 4
The road marking paint coated on the road surface can be cooled and solidified in a few minutes
Data Source
AI summary
A hot-melt road marking paint composition is disclosed. The road marking paint composition includes, percentage by weight, 25-45% glass beads, 20-42% calcium carbonate, 18-23% maleic-modified glyceryl ester of rosin, 1-5% polyethylene terephthalate, and 8-15% titanium dioxide or 1-1.5% C.I. Pigment Yellow 83.