Recyclate Verification via Thermally Stable Marker Compounds
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Solution Overview
Problem
Conventional methods are ineffective in verifying the recycled resin content in resin blends due to the chemical identity of recycled and virgin resins, relying on extensive supply chain audits, which is impractical.
Innovation Solution
Incorporating thermally stable verification compounds into recyclates that can be detected and measured, allowing for the verification of recyclate content through thermal removal and blending with virgin resin, enabling practical verification methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If verification compounds are added to recyclate, then recyclate content can be detected and measured, but the complexity of the resin composition increases
Solution Approach 1:
A verification compound acts as an intermediary substance that can be detected to indicate the presence of recyclate. The compound itself is not the recyclate but serves as a marker that enables detection and measurement of recyclate content without requiring direct analysis of the recyclate material itself.
Solution Approach 2:
The verification compound undergoes parameter changes (thermal decomposition) at specific temperatures that differ from the base resin. This parameter change enables detection methods to distinguish between virgin resin and recyclate containing the verification compound, achieving measurement precision without permanently altering the recyclate.
2Stability of the object's composition
If the verification compound is thermally stable at processing temperature, then it survives the recycling process, but it may affect the degradation temperature of the base resin
Solution Approach 1:
The verification compound is designed with local quality characteristics where its thermal stability profile is specifically tailored to match the processing temperature range of the base resin. The compound remains stable at processing temperatures but decomposes at higher temperatures, creating a localized stability window that avoids affecting the base resin's degradation point.
Solution Approach 2:
The verification compound is present in small, controlled quantities (partial action) that are sufficient for detection purposes but insufficient to significantly alter the overall thermal degradation behavior of the base resin. The low concentration ensures the base resin's degradation temperature remains effectively unchanged.
3Measurement precision
If extensive supply chain audits are used to verify recyclate content, then verification accuracy may be maintained, but the process becomes impractical and time-consuming
Solution Approach 1:
The complex mechanical and administrative process of supply chain audits is replaced with a chemical detection system. Instead of tracking materials through documentation and manual verification, the verification compound provides a direct chemical signature that can be rapidly detected and quantified, substituting a time-consuming administrative process with a quick analytical measurement.
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
Facilitates accurate verification of recyclate content without affecting the chemical and physical properties of the base resin, allowing for reliable identification and quantification of recycled material in blends.
Implementation Method 1
Each of the verification compounds is thermally stable over a range of temperatures that includes the maximum processing temperature of the base resin but is less than the degradation temperature of the base resin
Data Source
AI summary
A composition for recyclate verification is produced by adding a predetermined quantity of one or more verification compounds to a base resin. Each of the verification compounds is thermally stable over a range of temperatures that includes the maximum processing temperature of the base resin but is less than the degradation temperature of the base resin. In some embodiments, a thermoplastic material provided for verification as a recyclate is analyzed to detect the presence (and, optionally, the loading level) of one or more verification compounds associated with the base resin of the thermoplastic material. In some embodiments, a computer-implemented method for recyclate verification is performed using a computer program product. In some embodiments, a thermoplastic material verified as a recyclate is heated to drive off the verification compound(s), then a known quantity of the verification compound(s) is added to the recyclate, which is then blended with virgin base resin material.