Polycarbonate Resin Recycling via Solvent Purification and Precipitation
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Solution Overview
Problem
Existing methods for recycling polycarbonate resins face challenges in achieving good color tone and mechanical properties due to the difficulty in separating additives and degraded components, limiting their practical use in applications requiring transparency and mechanical strength.
Innovation Solution
A method involving dissolving polycarbonate resin waste in a good solvent, contacting the solution with an agglomerating agent to remove undissolved substances, precipitating the resin with a poor solvent, and recovering the recycled polycarbonate resin, utilizing specific solvents and agents to enhance the removal of impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If material recycling method is used to recycle polycarbonate resin, then the recycling process is simpler compared to chemical recycling, but the color tone and mechanical properties of the recycled resin are insufficient for practical use
Solution Approach 1:
The patent extracts and removes degraded components and additives from the polycarbonate resin waste composition through dissolution in a good solvent followed by filtration. This separation step isolates the pure polycarbonate resin from impurities, enabling the recycled resin to achieve both good color tone and mechanical properties while maintaining a relatively simple material recycling process
Solution Approach 2:
The patent uses a good solvent as an intermediary medium to dissolve the polycarbonate resin waste, allowing degraded components and additives to be separated through filtration. The solvent acts as a mediator that enables purification without requiring complex chemical decomposition processes, thus maintaining process simplicity while improving product quality
2Loss of substance
If chemical recycling method is used to decompose polycarbonate resin into bisphenol, then the raw material can be recovered, but the burden accompanying decomposition and purification is heavier
Solution Approach 1:
The patent changes the physical state and solubility parameters of the polycarbonate resin by dissolving it in a good solvent at controlled temperatures. This parameter change allows the resin to be separated from degraded components through filtration without requiring chemical decomposition into bisphenol, thus recovering the raw material while avoiding the heavy burden of decomposition and purification processes
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 produces a recycled polycarbonate resin with improved color tone and mechanical properties, suitable for practical applications by effectively removing additives and degraded components.
Implementation Method 1
preparing a polycarbonate resin solution by dissolving the polycarbonate resin waste raw material in a good solvent in which the polycarbonate resin waste raw material is soluble
Implementation Method 2
bringing the polycarbonate resin solution into contact with an agglomerating agent, and subsequently removing undissolved substances
Implementation Method 3
precipitating the recycled polycarbonate resin by mixing the solution (L) with a poor solvent
Data Source
AI summary
Provided is a method for producing a recycled polycarbonate resin according to the present invention includes step of preparing a polycarbonate resin solution by dissolving the polycarbonate resin waste raw material in a good solvent, step of bringing the polycarbonate resin solution into contact with an agglomerating agent, and subsequently removing undissolved substances to prepare a solution free of undissolved substances, step of precipitating the recycled polycarbonate resin by mixing the solution with a poor solvent, and step of recovering the precipitated recycled polycarbonate resin.