Complex Metal Oxide Catalyst for Polyester Polymerization
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Solution Overview
Problem
Existing catalysts for polyester polymerization, such as antimony-based and titanium-based catalysts, face issues with toxicity, environmental concerns, and limitations in catalytic activity, stability, and the occurrence of pyrolysis, oxidation degradation, and yellowing problems during the manufacturing of polyester products like polyethylene terephthalate.
Innovation Solution
A complex metal oxide catalyst is developed, comprising metals like magnesium, zinc, copper, manganese, calcium, iron, and titanium, which is synthesized using titanium alkoxide, aluminum alkoxide, and metal alkoxide, forming a stable hexagonal structure that maintains catalytic activity even with a small amount, reducing the need for excessive phosphorus and minimizing pyrolysis and yellowing issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antimony-based catalyst is used for polyester polymerization, then catalytic activity is achieved, but toxicity and environmental harm increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing antimony-based catalysts with complex metal oxides containing titanium, aluminum, and other metals in specific ratios. This parameter change maintains catalytic activity while eliminating the toxicity associated with antimony, resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The invention uses composite metal oxide materials (e.g., Ti-Al-O, Ti-Mg-Al-O) instead of single-metal catalysts. These composite structures provide both the catalytic activity needed for polymerization and the stability required to prevent toxicity, simultaneously addressing both the productivity and harmful factors concerns.
2Object-affected harmful factors
If complex oxide catalyst is used, then environmental friendliness improves, but pyrolysis and yellowing problems occur during melting and molding
Solution Approach 1:
The patent optimizes the metal composition ratios (e.g., Ti:Al:Mg in specific proportions) and control parameters like reaction temperature and time during catalyst synthesis. These parameter changes enhance the thermal stability of the complex oxide catalyst, preventing pyrolysis and yellowing during subsequent melting and molding processes while maintaining environmental friendliness.
Solution Approach 2:
By creating composite metal oxide structures with multiple metals (Ti, Al, Mg, Zn, etc.), the patent achieves synergistic effects where the composite material exhibits both environmental compatibility and enhanced thermal stability during processing, resolving the contradiction between environmental friendliness and processing reliability.
3Quantity of substance
If existing complex oxide catalyst is used, then phosphorus can be used as thermal stabilizer, but pyrolysis and oxidation degradation still occur
Solution Approach 1:
The patent changes the fundamental approach by modifying the catalyst's own composition parameters to include metals with inherent anti-pyrolysis and anti-oxidation properties (such as Mg, Zn, Mn in addition to Ti and Al). This eliminates the need for phosphorus additives while directly providing resistance to pyrolysis and oxidation degradation.
Solution Approach 2:
The complex metal oxide catalyst acts as an intermediary that provides thermal stability and protection against pyrolysis and oxidation during processing. The catalyst structure itself mediates the protection against degradation, replacing the need for separate phosphorus-based stabilizer additives.
4Productivity
If catalyst activity is not controllable in polycondensation, then polymerization proceeds, but molecular weight distribution becomes large
Solution Approach 1:
The patent precisely controls the composition parameters of the complex metal oxide catalyst, including the ratios of different metals and the particle size distribution. These parameter changes enable controllable and uniform catalytic activity throughout the polycondensation process, resulting in narrow molecular weight distribution while maintaining high polymerization activity.
Solution Approach 2:
The multi-metal composite oxide structure provides multiple active sites with different functionalities, allowing for controlled polymerization at different stages. This composite structure enables precise control over the polycondensation process, achieving both high productivity and narrow molecular weight distribution simultaneously.
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 complex metal oxide catalyst exhibits high catalytic activity, stability, and low toxicity, enabling the production of polyethylene terephthalate with improved physical properties like transparency, viscosity, and color stability, suitable for applications in food and drink containers.
Implementation Method 1
a complex metal oxide including three kinds of metal and having a stabilized structure to be capable of being used as a catalyst for polyester polymerization
Data Source
AI summary
Disclosed herein are a novel complex metal oxide catalyst, and a method of preparing polyester using the same. The metal-bound compound of the present invention has a higher catalytic activity as compared to an antimony catalyst and existing titanium catalysts to be easily synthesized and stabilized, have a sufficient polymerization activity even with a small amount, and be used as an environmentally friendly catalyst for polyester polymerization. In addition, when preparing polyester by using the complex metal oxide of the present invention, since catalytic activity caused by phosphorus (P) which is a thermal stabilizer used to decrease pyrolysis at the time of hot-melting and molding is not deteriorated, an excessive amount of phosphorus may be used as compared to the related art, such that pyrolysis less occurs, whereby the yellowing phenomenon may be decreased and high viscosity may be maintained. Therefore, the complex metal oxide may be usefully applied to the preparation of polyester having good physical properties, in particular, polyethylene terephthalate.