Polyurethane Acidolysis Recycling with Acetoacetylated Polyol Reuse
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Solution Overview
Problem
Existing polyurethane recycling methods require significant energy, time, and resources, necessitating the development of more efficient processes to enhance recyclability.
Innovation Solution
A process involving acidolysis of polyurethane materials using an acid solution to decompose moieties like esters, amides, and thioesters, followed by reaction with acetoacetylated polyol to form polyol compounds, which can be reused in manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional recycling methods (mechanical recycling, glycolysis, hydrolysis, pyrolysis, hydrogenation) are used to recycle polyurethane materials, then polyurethane waste can be processed, but significant energy, time, and resources are consumed
Solution Approach 1:
The patent changes the chemical parameter of the polyurethane material by incorporating hydrolyzable moieties (esters, amides, thioesters) that can be decomposed under mild acidic conditions. This allows the recycling process to proceed at lower temperatures and with less energy input compared to conventional methods like pyrolysis or hydrogenation, while still achieving effective waste conversion to reusable monomers
Solution Approach 2:
The patent introduces acid-catalyzed hydrolysis as an intermediary step that converts the polyurethane material into reusable monomers under milder conditions. The acid catalyst acts as a mediator that enables decomposition at lower energy input, and the resulting monomers can be directly reused in manufacturing, creating an efficient circular economy pathway
2Loss of substance
If conventional recycling methods (mechanical recycling, glycolysis, hydrolysis, pyrolysis, hydrogenation) are used to recycle polyurethane materials, then polyurethane waste can be processed, but significant time and resources are consumed
Solution Approach 1:
By changing the chemical structure to include hydrolyzable bonds and using acid-catalyzed hydrolysis, the recycling process achieves faster reaction rates and shorter processing times compared to conventional methods. The hydrolyzable moieties are designed to break down readily under acidic conditions, enabling rapid conversion to monomers without requiring extended high-temperature treatment
3Loss of substance
If conventional recycling methods are used, then polyurethane materials can be recycled, but manufacturing costs are not reduced
Solution Approach 1:
The patent modifies the chemical parameters of the polyurethane material by incorporating hydrolyzable moieties that can be easily converted to reusable monomers through acid-catalyzed hydrolysis. This design enables cost-effective recycling by using simple, inexpensive acid catalysts and avoiding the need for complex, energy-intensive equipment required by conventional methods, thereby reducing overall manufacturing costs
Solution Approach 2:
The acid-catalyzed hydrolysis process serves as an economical intermediary that converts waste polyurethane into valuable reusable monomers at low cost. The method uses readily available acid catalysts and operates under mild conditions, eliminating the need for expensive equipment and high energy inputs, thus making the recycling process economically viable
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
This process reduces the amount of polyurethane waste and lowers manufacturing costs by converting polyurethane materials into reusable raw materials efficiently.
Implementation Method 1
the polyurethane material comprises a moiety capable of undergoing decomposition through acidolysis... contacting the polyurethane material with an acid solution and allowing at least a portion of the polyurethane material to decompose into a recovered raw material composition
Data Source
AI summary
A process for recycling a polyurethane material wherein the polyurethane material comprises a moiety that is capable of undergoing decomposition through acidolysis, the process comprising: contacting the polyurethane material with an acid solution and allowing at least a portion of the polyurethane material to decompose into a recovered raw material composition comprising a degradation compound; and introducing an acetoacetylated polyol into the recovered raw material composition and reacting the acetoacetylated polyol with the degradation compound to form a polyol compound.