Resin Classification Using Pyrolysis 2D GC-MS and Multivariate Analysis
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Solution Overview
Problem
Existing methods for classifying resins based on chemical structure are limited to rough information and fail to account for subtle differences in monomer type and amount, which affect the physical properties of vulcanized rubber.
Innovation Solution
A method involving a purification step at a temperature below resin decomposition, followed by pyrolysis at a higher temperature, using a two-dimensional gas chromatograph mass spectrometer for analysis, and multivariate analysis to create a classification table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pyrolysis gas chromatography is used for resin analysis, then the analysis process is simple, but only rough information on monomer species can be obtained and detailed structural classification is limited
Solution Approach 1:
The patent transitions from one-dimensional gas chromatography to two-dimensional gas chromatography-mass spectrometry (2D GC-MS). This dimensional enhancement allows for superior separation of complex resin pyrolysates by introducing a second separation dimension with different stationary phase properties, enabling detailed structural classification that was unattainable with conventional 1D GC alone
Solution Approach 2:
The patent introduces pyrolysis as an intermediary step that converts complex resin structures into simpler, more separable pyrolysates. This intermediate transformation facilitates detailed analysis by breaking down the original resin molecules into characteristic fragments that can be more effectively separated and identified by the 2D GC-MS system
2Measurement precision
If resins are directly subjected to pyrolysis treatment, then the analysis process is short, but volatile components and decomposition products interfere with accurate classification
Solution Approach 1:
The patent applies a preliminary heat treatment step at controlled temperatures (100-300°C) before the main pyrolysis process. This pre-treatment removes volatile components and stabilizes the resin samples, preventing interference from unwanted decomposition products during subsequent pyrolysis and ensuring more accurate classification results
Solution Approach 2:
The patent carefully controls and changes temperature parameters through distinct stages: initial heat treatment at 100-300°C to remove volatiles, then pyrolysis at 400-700°C for decomposition. This staged temperature control optimizes both the removal of interfering substances and the generation of characteristic pyrolysates for accurate classification
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
Enables detailed classification of resins, accurately separating and assigning peaks, thereby improving the accuracy of resin classification and correlation with physical properties.
Implementation Method 1
a purification step of removing volatile components by subjecting resins to be classified to a heat treatment at a temperature lower than each decomposition temperature
Implementation Method 2
a decomposition step of subjecting the resins to be classified to a pyrolysis treatment at a temperature higher than each decomposition temperature to obtain pyrolysates of the resins
Implementation Method 3
an analysis step of separating and analyzing the pyrolysates using a two-dimensional gas chromatograph mass spectrometer
Data Source
AI summary
A method for classifying at least two or more resins, the method comprising: a purification step of removing volatile components by subjecting resins to be classified to a heat treatment at a temperature lower than each decomposition temperature; a decomposition step of subjecting the resins to be classified to a pyrolysis treatment at a temperature higher than each decomposition temperature to obtain pyrolysates of the resins; an analysis step of separating and analyzing the pyrolysates using a two-dimensional gas chromatograph mass spectrometer; a table creation step of creating a table by performing assignment of peaks appearing in each two-dimensional chromatogram obtained after the analysis step and alignment between the two-dimensional chromatograms; and a classification step of classifying resins by performing multivariate analysis based on the created table.