Recycled Polyester Elastomer with One-Step Catalyst Processing
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Solution Overview
Problem
Existing methods for producing regenerated thermoplastic elastomers from recycled polyesters are inefficient, costly, and result in poor quality due to complex multi-step processes, catalyst residues, and yellowing issues, failing to meet high-end product requirements.
Innovation Solution
A one-step process using a polyol-coordinated titanium catalyst for alcoholysis and transesterification, minimizing side reactions and enabling direct production of high-quality thermoplastic elastomers with improved hue and physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-step depolymerization and esterification processes are used, then regenerated thermoplastic elastomers can be produced from recycled polyester, but the process complexity increases and production efficiency decreases
Solution Approach 1:
The patent combines depolymerization and esterification reactions into a single integrated reaction step by using a catalyst system that can facilitate both transformations simultaneously. This eliminates the need for separate reaction vessels and intermediate isolation steps, thereby simplifying the manufacturing process while maintaining high production efficiency through continuous one-pot conversion of recycled polyester to thermoplastic elastomer.
2Productivity
If conventional catalysts are used for depolymerization, then reaction efficiency improves, but catalyst residues cause side reactions and yellowing of the product
Solution Approach 1:
The patent employs a catalyst system designed to be effective at low concentrations and then removed or deactivated after the reaction completes. The catalyst performs its function efficiently during the reaction but is subsequently eliminated through filtration or other separation techniques, preventing residue-related yellowing and side reactions in the final thermoplastic elastomer product while maintaining high reaction efficiency.
3Adaptability or versatility
If recycled polyester is used as raw material, then resource utilization improves, but performance of the regenerated elastomer declines
Solution Approach 1:
The patent utilizes parameter changes in the form of catalyst selection and reaction condition optimization to transform recycled polyester into high-performance thermoplastic elastomer. By adjusting catalytic activity, temperature, and reaction time parameters, the process achieves complete depolymerization and controlled re-polymerization with esterification, thereby restoring and enhancing the molecular structure and physical properties of the regenerated elastomer to meet high-end application requirements.
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 thermoplastic elastomers with intrinsic viscosity, hue, and melting point closer to traditional products, reducing energy loss and catalyst residues, thus achieving higher quality and economic efficiency.
Implementation Method 1
a) performing one-step reaction of alcoholysis of a first polyester and transesterification of a second polyol by using a first polyol coordinated titanium compound catalyst
Implementation Method 2
a) performing one-step reaction of alcoholysis of a first polyester and transesterification of a second polyol by using a first polyol coordinated titanium compound catalyst
Implementation Method 3
a) performing one-step reaction of alcoholysis of a first polyester and transesterification of a second polyol by using a first polyol coordinated titanium compound catalyst
Data Source
AI summary
A method for manufacturing recycled thermoplastic polyester elastomer (rTPEE), including one-step alcoholysis and transesterification with a polyol-coordinated titanium compound catalyst to obtain recycled polyester, and then reacting with polyol to obtain a recycled thermoplastic polyester elastomer. A recycled thermoplastic polyester elastomer with more excellent hue and better physical properties is provided by using the method.