Recycled PET Road Marking Compound Viscosity Control
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Solution Overview
Problem
Conventional melt-bonding road marking paints face challenges in achieving optimal fluidity, durability, and environmental sustainability due to limitations in the composition and use of recycled materials.
Innovation Solution
The method involves maximizing the use of polyethylene terephthalate (PET) from recycled plastic in the formulation of melt-bonding road marking compounds, optimizing the bead diameter of glass beads, and adjusting the proportions of silica, calcium carbonate, and thermoplastic resins to ensure the compound remains liquid and enhances durability while promoting environmental benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of recycled PET is increased to improve environmental sustainability, then the fluidity and durability of the road marking paint are improved, but the compound may become too viscous to flow through application equipment
Solution Approach 1:
The patent optimizes the bead diameter parameter of glass beads (selecting specific size ranges) and adjusts the proportion parameters of each component to achieve the desired balance between viscosity and durability. By changing these physical and compositional parameters, the formulation achieves optimal flow properties while maintaining high recycled content
Solution Approach 2:
The patent creates a composite formulation combining recycled PET, glass beads of specific diameters, calcium carbonate, and thermoplastic resins. This composite approach allows each component to contribute specific properties: PET provides durability and sustainability, glass beads provide fluidity and reflectivity, calcium carbonate provides filler volume, and thermoplastic resins provide binding. The synergistic combination resolves the contradiction between viscosity and performance
2Ease of operation
If glass beads with larger bead diameter are used to improve fluidity, then the compound flows more easily through screens and nozzles, but the reflectivity and visibility may be reduced
Solution Approach 1:
The patent applies local quality by using a distribution of glass bead sizes rather than a single size. Larger beads (400-750 microns) provide flowability, while smaller beads are present to maintain reflectivity. Each size fraction performs its specific function locally within the overall composition, resolving the contradiction between fluidity and optical performance
3Reliability
If more thermoplastic resins are added to improve adhesion and durability, then the peel strength is enhanced, but the environmental sustainability and use of recycled materials is reduced
Solution Approach 1:
The recycled PET itself serves dual functions: it acts as both the recycled material (replacing virgin thermoplastic resins) and provides adhesive properties through its thermoplastic nature. The PET component contributes to binding the formulation together while maintaining durability, eliminating the need for additional virgin thermoplastic resins and maximizing recycled content
Data Source
AI summary
A method of manufacture for an improved composition for melt-bonding road marking compound is disclosed. Comprising preparing a PET component from pulverized recycled plastic. combining the PET component, a pigment component, a filler component, a silica component and a binder component to form a road marking compound. melting the road marking compound form the melt-bonding road marking compound. selecting an amount of the PET component to maximize PET in the melt-bonding road marking compound while ensuring the melt-bonding road marking compound remains liquid for application to a road surface. The PET component comprises glass beads, is substantially clear, and substantially spherical. The PET component comprises glass beads. The method of manufacture comprises optimizing a bead diameter of the PET component to ensure the melt-bonding road marking compound can flow through screens and nozzles in a typical road paint application equipment.