Impact-Modified Polymer Recycling Through Selective Dissolution
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Solution Overview
Problem
Existing methods for recycling impact modified polymers of vinylidene aromatic monomers fail to maintain the impact modifier structure and quality, requiring additional steps to reintroduce additives, which are costly and time-consuming.
Innovation Solution
A method involving forming a solution with a solvent and post-consumer or post-industrial waste containing impact modified polymers, separating undissolved materials, and removing the solvent to recover the impact modified polymer, maintaining its particle size and morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional recycling methods (cracking, depolymerization, repeated washing) are used to remove additives and purify polymer, then polymer purity is improved, but impact modifier structure is destroyed and processing time increases
Solution Approach 1:
The patent changes the chemical parameters of the recycling process by using selective solvents that dissolve the polymer matrix while leaving the impact modifier particles intact. This selective dissolution approach maintains the grafted/crosslinked structure of impact modifiers unlike traditional cracking or depolymerization methods
Solution Approach 2:
The patent extracts only the polymer matrix from the composite material using selective solvents, while the impact modifier particles remain as a residual framework. This extraction process preserves the functional structure of impact modifiers while removing the polymer carrier
2Manufacturing precision
If traditional recycling methods are used to purify polymer, then polymer purity is improved, but processing time and cost increase due to repeated washing and multiple solvent steps
Solution Approach 1:
The patent skips the time-consuming repeated washing steps by using a single selective solvent treatment that achieves both dissolution and separation in one process. The method rushes through the recycling process by directly forming the residual framework without intermediate purification steps
Solution Approach 2:
The patent merges multiple process steps (dissolution, separation, and framework formation) into a single integrated operation. The selective solvent simultaneously dissolves the polymer and leaves the impact modifier framework intact, eliminating the need for separate washing and drying steps
3Manufacturing precision
If impact modifiers are removed during purification, then polymer purity is improved, but the recycled polymer loses its impact resistance properties
Solution Approach 1:
The patent converts what would normally be considered waste (the residual impact modifier framework after polymer dissolution) into a beneficial functional structure. The remaining impact modifier particles serve as reinforcement in the recycled material, providing both structural integrity and impact resistance
Solution Approach 2:
The patent discards the polymer matrix through selective dissolution while recovering and preserving the impact modifier framework. The recovered impact modifier particles are then reused as functional components in the recycled composite material
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 effectively recycles impact modified polymers while preserving the impact modifier and additives, eliminating the need for additional reintroduction steps and reducing costs.
Implementation Method 1
a solvent is selected that will dissolve the polymer but not the impact modifier
Implementation Method 2
The solution is then filtered to separate the undissolved impact modifier from the solution
Implementation Method 3
The solvent is then evaporated or otherwise removed to disperse the impact modifier
Data Source
AI summary
Methods for treating post-consumer and/or post-industrial waste containing impact modified polymers of monovinylidene aromatic monomers are disclosed. The methods may include forming a solution comprising a solvent and at least one post-consumer and/or post-industrial waste comprising an impact modified polymer wherein the polymer is based on monovinylidene aromatic monomers and an impact modifier having a specific particle size and morphology; separating and removing undissolved and/or undispersed material in the solution from the solution; and separating and removing the solvent from dissolved and/or dispersed material to recover the impact modified polymer; wherein the solvent dissolves and/or disperses the impact modified polymer, and wherein the recovered impact modified polymer maintains the impact modifier particle size and morphology.