Acid-Labile Polyol Components for Recyclable, Reworkable Polyurethane
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Solution Overview
Problem
Polyurethanes (PUs) are non-reworkable and non-recyclable, leading to higher costs and environmental issues due to inefficient recycling methods that cause global warming and toxic gas release.
Innovation Solution
Development of recyclable polyol components with specific structural formulas that allow for polyurethane systems to soften and dissolve in an acid and solvent mixture, enabling bond cleavage and recycling through a process involving polyol components with acid-labile cross-links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane systems are used, then excellent mechanical properties and durability are achieved, but the materials become non-reworkable and non-recyclable
Solution Approach 1:
The polyol component is divided into distinct functional segments: a core polyol portion providing mechanical properties and a degradable portion containing acid-labile groups (acetals, ketals, orthoesters, or orthocarbonates) that enable recyclability. This segmentation allows the material to maintain durability during use while enabling controlled degradation for recycling through acid treatment.
2Loss of substance
If existing recycling methods (physical, thermal, chemical) are applied to polyurethanes, then material recovery is attempted, but environmental harm occurs through global warming, toxic gas release, and ash landfilling
Solution Approach 1:
The invention changes the chemical parameters of the polyol component by incorporating acid-labile functional groups (acetals, ketals, orthoesters, or orthocarbonates) that selectively degrade under acidic conditions. This allows the polyurethane to be recycled through acid treatment at controlled temperatures, avoiding the high-temperature incineration and toxic solvent processes of conventional recycling methods, thereby eliminating environmental harm while achieving material recovery.
3Strength
If polyurethane composites are made non-reworkable for structural applications, then high strength and fast curing are achieved, but cost increases due to disposal requirements
Solution Approach 1:
The invention introduces dynamic reversibility to the polyurethane system through acid-labile crosslinks. The material maintains strong, stable crosslinked structure during service for high strength applications, but can be dynamically reversed by acid treatment to break crosslinks and enable recycling. This dynamic behavior allows the same material to provide both high strength performance and cost-effective recyclability, eliminating disposal costs.
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 the recycling of polyurethane systems without environmental harm, reducing costs and waste by allowing for the reuse of materials.
Implementation Method 1
polyol component having a structural Formula (I) or a structural Formula (II) or a structural Formula (III)... acid-labile cross-links... heating the polyurethane system and immersing the heated polyurethane system in an acid and a solvent
Data Source
AI summary
Polyol component(s) for a recyclable polyurethane system is disclosed. The recyclable polyurethane system comprises a polyol component having a structural Formula (I), a polyol component having a structural Formula (II) or a polyol component having a structural Formula III and an isocyanate curing agent. A process(es) for preparing the polyol component having the structural Formula (I), the polyol component having the structural Formula (II) and the polyol component having the structural Formula (III) is also disclosed.