Polyester Thermostability via 1,2-Propanediol Component
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Solution Overview
Problem
Polymers synthesized from biomass-derived glycol exhibit poor thermostability during melt molding, leading to decomposition reactions, yellowing, and reduction in viscosity, causing soiling of the molding machine and generation of foreign matter.
Innovation Solution
Incorporating 15 to 500 ppm of a 1,2-propanediol-derived component into the polyester, which improves thermostability by limiting thermal decomposition reactions without suppressing polymerization activity, and using a manufacturing method that includes esterification or ester interchange reactions followed by condensation polymerization under reduced pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyester is synthesized from biomass-derived glycol, then environmental sustainability is improved, but thermostability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester by incorporating specific amounts of 1,3-propanediol-derived components (15-500 ppm) and controlling diethylene glycol content (0.5-5 mol%). This parameter optimization resolves the contradiction by achieving both biomass-derived sustainability and improved thermostability during melt molding.
Solution Approach 2:
The patent creates a composite polyester structure by combining biomass-derived glycol with controlled amounts of 1,3-propanediol-derived components and limiting diethylene glycol content. This composite approach maintains the environmental benefits of biomass while achieving the thermostability required for industrial melt molding applications.
2Ease of manufacture
If polyester undergoes melt molding at high temperature, then shaping capability is improved, but decomposition reaction increases
Solution Approach 1:
The patent optimizes the chemical composition parameters (1,3-propanediol-derived component: 15-500 ppm, diethylene glycol: 0.5-5 mol%) to achieve a balance between moldability and thermal stability. This allows the polyester to undergo melt molding at conventional temperatures without excessive decomposition, reducing yellowing and viscosity loss.
3Reliability
If polyester exhibits high thermostability, then intrinsic viscosity reduction is minimized, but production cost increases
Solution Approach 1:
The patent identifies optimal concentration ranges for 1,3-propanediol-derived components (15-500 ppm) and diethylene glycol (0.5-5 mol%) that achieve thermostability at minimal deviation from conventional polyester composition. This optimized parameter range balances performance improvement with production cost considerations.
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 polyester exhibits excellent thermostability with minimal reduction in intrinsic viscosity during melt molding, reducing soiling and foreign matter generation, enabling continuous operation and increased production efficiency.
Implementation Method 1
the above process promotes decomposition reaction in such polymers and causes yellowing and a reduction in viscosity
Implementation Method 2
a manufacturing method that includes esterification or ester interchange reactions followed by condensation polymerization under reduced pressure
Implementation Method 3
esterification or ester interchange reactions followed by condensation polymerization under reduced pressure
Implementation Method 4
condensation polymerization under reduced pressure
Data Source
AI summary
To provide polyester which has excellent thermostability with only a small reduction in intrinsic viscosity during melt molding. A polyester obtained from a dicarboxylic acid, and/or an ester-forming derivative thereof, and a diol which is characterized by the fact that it contains 15 to 500 ppm of a 1,2-propanediol-derived component.