Cured Epoxy Depolymerization Using Transition Metal Catalysts
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Solution Overview
Problem
Current methods for depolymerizing cured epoxy resin materials, such as pyrolysis and organic solvent-based processes, require high temperatures and pressures, result in environmental contamination, and are inefficient in terms of energy and cost.
Innovation Solution
A method using a composition comprising a transition metal salt or oxide and a H2O-based reaction solvent, which allows for depolymerization of cured epoxy resin materials at temperatures of 200°C or lower, reducing processing costs and energy requirements, and minimizing environmental contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrolysis process is used to decompose epoxy resin, then decomposition can be achieved, but high temperature (500°C or higher) is required which causes energy consumption and environmental pollution
Solution Approach 1:
A catalyst system comprising a transition metal complex and an organic carboxylic acid is introduced as an intermediary to enable epoxy resin decomposition at lower temperatures. The catalyst facilitates the depolymerization reaction by lowering the activation energy barrier, allowing the process to proceed effectively at 200-400°C instead of requiring pyrolysis temperatures above 500°C.
Solution Approach 2:
The invention changes the chemical parameters of the decomposition system by introducing specific catalysts (transition metal complexes combined with organic carboxylic acids). This parameter change enables the decomposition reaction to occur under milder temperature conditions, transforming the process from high-temperature pyrolysis to controlled catalytic depolymerization.
2Reliability
If mechanical crushing is performed to separate carbon fibers, then filler separation can be achieved, but carbon fiber length decreases and properties deteriorate
Solution Approach 1:
The invention replaces the mechanical crushing system with a chemical decomposition system. Instead of mechanically breaking down the epoxy resin matrix to separate carbon fibers, the catalyst system chemically depolymerizes the epoxy resin, allowing for non-mechanical separation that preserves carbon fiber integrity and length.
3Temperature
If supercritical fluid decomposition is used, then treatment temperature can be reduced to 250-400°C, but high pressure (10 atm or higher) is required which increases equipment complexity and cost
Solution Approach 1:
The invention changes the pressure parameter of the decomposition system by introducing a catalyst system that enables effective depolymerization at atmospheric or near-atmospheric pressures. This eliminates the need for high-pressure equipment while maintaining the temperature advantage over traditional pyrolysis, thereby reducing device complexity and operational costs.
4Temperature
If organic solvents are used for decomposition, then reaction can proceed at lower temperature, but environmental contamination and safety issues arise
Solution Approach 1:
The invention employs water as a replaceable, environmentally benign medium instead of persistent organic solvents. Water serves as the reaction medium for the catalytic depolymerization process, eliminating the environmental contamination and safety issues associated with organic solvents while maintaining low-temperature processing capability.
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 method enables rapid and efficient depolymerization of cured epoxy resin materials at lower temperatures, reduces environmental impact, and preserves the properties of recovered fillers, such as carbon fibers, with minimal degradation.
Implementation Method 1
a method for depolymerization of cured epoxy resin materials using transition metal salts
Implementation Method 2
a method and a composition for depolymerization of cured epoxy resin materials using transition metal salts
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
For depolymerization of a cured epoxy resin material, used is a composition including a transition metal salt or a transition metal oxide containing a transition metal element (metal element that belongs to Groups 3-12 in the Periodic Table). In the reaction solvent, an oxidation occurs by the medium of the transition metal element so that the cured epoxy resin material may be depolymerized and decomposed. In this manner, it is possible to carry out depolymerization of a cured epoxy resin material at a temperature of 200°C, specifically 100°C or lower very simply and rapidly, and to reduce the processing cost and energy requirement.