Polymer Sorting via Intrinsic Fluorescence Decay Time
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Solution Overview
Problem
Current recycling methods for polymer materials are inefficient due to the need for high-purity sorting, which is complex and often unfeasible, especially for unmarked secondary materials, as they rely on density or electrostatic properties and require complex fluorescence spectrum registration.
Innovation Solution
The method utilizes the intrinsic fluorescence decay times of polymers, specifically with perylenetetracarboxylicbisimides and terrylenetetracarboxylicbisimides, to identify and sort polymers by detecting fluorescence decay times using pulsed light sources and phase-sensitive detectors, allowing for efficient sorting without prior marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence spectrum registration is used to identify polymer materials, then identification accuracy is improved, but device complexity and operational complexity increase significantly
Solution Approach 1:
The invention extracts only the essential identification feature (fluorescence decay time) from the complete fluorescence spectrum, eliminating the need for complex spectrum registration and analysis. This single parameter extraction resolves the contradiction by maintaining identification accuracy while dramatically simplifying the measurement system.
Solution Approach 2:
The patent creates a simplified copy of the fluorescence information by using only the decay time parameter instead of the full spectrum. This copy contains sufficient identification information for polymer materials while avoiding the complexity of complete spectral analysis.
2Reliability
If polymer materials are marked with fluorescence dyes for identification, then detection reliability is improved, but the method becomes infeasible for unmarked secondary materials
Solution Approach 1:
The invention enables polymer materials to identify themselves through their intrinsic fluorescence decay time without requiring external marking. Each polymer type naturally exhibits characteristic decay times, allowing the method to work on both marked and unmarked materials including secondary materials.
3Manufacturing precision
If complex sorting methods are used to achieve high-purity separation, then sorting precision is improved, but productivity and efficiency decrease
Solution Approach 1:
The invention changes the detection parameter from complex fluorescence spectra to simple fluorescence decay time, enabling fast measurements that support high productivity while maintaining sufficient sorting precision through characteristic decay time values for different polymer types.
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
This approach enables fast, reliable, and efficient sorting of polymers, including thermoplastics, with high detection reliability and throughput, capable of processing 1.5 tons of material per hour, and can be used for both primary and secondary materials, reducing environmental impact.
Implementation Method 1
Use of perylenetetracarboxylicbisimides of the general formula 4 for fluorescence coding of macro-molecular substances for their clear identification via the fluorescence decay time
Implementation Method 2
the detection according to a. to d. is performed using phase-sensitive detectors
Data Source
AI summary
The invention relates to the identification of polymer materials on the basis of the fluorescence decay time of the intrinsic fluorescence of the polymer materials for definite sorting in a completely separated manner. The invention further relates to marking with fluorescent dyes, which, because of the specific fluorescence decay times of the fluorescent dyes, can further increase the sorting reliability by means of redundancy and can be used to identify particular batches.