Titanium Catalyst for Polyester Resin Polymerization
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Solution Overview
Problem
Conventional titanium catalysts and antimony catalysts are ineffective in accelerating the polymerization reaction of polyester resins and reducing the yellowing phenomenon, leading to unattractive product appearances due to high temperature processing.
Innovation Solution
A titanium catalyst with specific chemical structures (Formula I, II, or III) is used, combined with a synthesizing method involving a feeding step, heating and pressurizing step, and heating and vacuuming step, to enhance the polymerization reaction rate and reduce yellowing, utilizing a Lewis acid catalyst to activate reaction monomers and incorporate a heat stabilizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heating is applied to promote polymerization reaction of polyester resins, then the polymerization reaction is accelerated, but the color of the polyester resins turns yellow due to high temperature
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a specific titanium catalyst with organic ligands (Formulas I, II, or III) and combining it with a metal organic compound catalyst. This parameter change enables the polymerization reaction to proceed at lower temperatures while maintaining high reaction rates, thus preventing yellowing while preserving productivity.
Solution Approach 2:
The patent uses a titanium catalyst with specific organic ligands as an intermediary substance that mediates the polymerization reaction. This intermediary catalyst system enables the reaction to proceed under milder conditions (lower temperature) compared to conventional catalysts, thereby preventing the harmful yellowing effect while maintaining efficient polymerization.
2Object-affected harmful factors
If conventional titanium catalysts or antimony catalysts are added to lighten and brighten the color of polyester resins, then the yellowing phenomenon is reduced, but the polymerization reaction is not sufficiently accelerated
Solution Approach 1:
The patent employs a composite catalyst system combining a titanium catalyst with specific organic ligands (Formulas I, II, or III) and a metal organic compound catalyst. This composite catalyst system achieves synergistic effects where the titanium catalyst provides color lightening and the metal organic compound accelerates the polymerization reaction, simultaneously addressing both the yellowing problem and the need for high productivity.
Solution Approach 2:
The patent modifies the catalytic parameters by using a specific titanium catalyst with organic ligands instead of conventional titanium or antimony catalysts. This parameter change enables the catalyst to perform both functions effectively: lightening the color and accelerating the polymerization reaction, thereby resolving the contradiction between color improvement and reaction rate enhancement.
3Ease of manufacture
If high temperature is used to carry out esterification reaction in autoclave, then the reaction is completed, but the products fabricated from the polyester resins have unattractive appearances
Solution Approach 1:
The patent changes the temperature parameter of the esterification reaction by using a specific catalyst system (titanium catalyst with organic ligands and metal organic compound) that enables the reaction to proceed at lower temperatures. This parameter change allows complete reaction while preserving the appearance quality of the products, avoiding the high temperature-induced discoloration that would compromise product appearance.
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 titanium catalyst effectively accelerates the polymerization reaction, reduces the yellowing of polyester resins, and produces products with lighter colors in a shorter reaction time, outperforming conventional catalysts while being non-toxic and maintaining catalytic activity in water-containing environments.
Implementation Method 1
utilizing a Lewis acid catalyst to activate reaction monomers
Implementation Method 2
In the heating and pressurizing step, the autoclave is set in a first heating state and a pressurizing state so as to carry out an esterification reaction
Implementation Method 3
In the heating and vacuuming step, the autoclave is set in a second heating state and is vacuumed to a vacuum state so as to carry out a polymerization reaction
Data Source
AI summary
A titanium catalyst and a synthesizing method of polyester resins are provided in the present disclosure. The titanium catalyst has a chemical structure represented by Formula (I), Formula (II) or Formula (III).The symbols shown in the Formula (I), the Formula (II) or the Formula (III) are defined in the description. The synthesizing method of polyester resins includes providing the titanium catalyst, performing a feeding step, performing a heating and pressurizing step and performing a heating and vacuuming step. The titanium catalyst and a heat stabilizer are added into an autoclave before the feeding step or before the heating and vacuuming step.