Titanium Mannitol Polyester Catalyst System
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Solution Overview
Problem
Conventional polyester polymerization catalysts, such as antimony and titanium compounds, lead to issues like foreign matter deposition, increased filtering pressure, and poor thermal stability and color tone in polyesters, particularly in fiber and film production.
Innovation Solution
A polyester polymerization catalyst system involving a titanium compound and mannitol, with a molar ratio of titanium to mannitol from 1:1 to 1:3, which enhances catalytic activity, reduces foreign matter generation, and improves thermal stability and color tone by inhibiting side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a titanium compound is used as a polymerization catalyst, then catalytic activity is improved and foreign matter generation is reduced, but thermal stability deteriorates and the polymer becomes yellow due to side reactions
Solution Approach 1:
A phosphorus compound is introduced as an intermediary substance between the titanium compound and the polyester. The phosphorus compound selectively inhibits side reactions (thermal decomposition and oxidative decomposition) while allowing the main polymerization reaction to proceed, thus mediating between the high reactivity of titanium and the stability requirements of the polyester
Solution Approach 2:
The invention changes the chemical environment parameters by adding specific phosphorus compounds that modify the reaction conditions. This allows the titanium catalyst to maintain high activity while the phosphorus compound adjusts the parameter of side reaction suppression, preventing yellowing and thermal degradation
2Productivity
If an antimony compound is used as a polycondensation catalyst, then high molecular weight polymer production is achieved, but foreign matter particles form and filtering pressure increases
Solution Approach 1:
The invention replaces the conventional antimony catalyst with a titanium compound system that uses minimal amounts of titanium (0.01-5 ppm) combined with phosphorus compounds. This disposable-like approach uses trace amounts of catalyst that do not accumulate as harmful residues, eliminating the foreign matter deposition problem associated with antimony
Solution Approach 2:
The invention changes the catalyst type parameter from antimony to titanium-phosphorus system, fundamentally altering the chemical behavior. This parameter change eliminates the formation of large foreign matter particles while maintaining polymerization efficiency
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 catalyst system significantly reduces foreign matter, maintains high activity, and improves thermal stability and color tone, addressing issues like filament breakage and filtering pressure increases in polyester production.
Implementation Method 1
a titanium compound in a small amount... can afford a polyester being good in fiber forming property and better in the thermal stability and the color tone
Implementation Method 2
by using mannitol, which is a polyhydric alcohol, as a ligand and making it react with titanium, it is possible to attain the benefits according to exemplary aspects of the present invention
Implementation Method 3
a carbonyl oxygen is activated by a metal catalyst having Lewis acidity and thereby beta hydrogen is removed, so that a vinyl terminal group component and an aldehyde component are generated
Data Source
AI summary
Provided are a polyester polymerization catalyst with which the generation of foreign materials caused by the catalyst or mold pollution at the time of molding are reduced and polyesters having remarkably superior thermal stability and color tone can be obtained.Provided is a polyester polymerization catalyst produced by the reaction of a titanium compound and a mannitol in a molar ratio of titanium atom to mannitol of from 1:1 to 1:3. A method for producing a polyester employs the polyester polymerization catalyst.