Biomass Copolyester for Low-Temp Thermal Bonding
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Solution Overview
Problem
Current copolyesters with low thermal bonding temperatures require multiple modifiers, complicating the process and risking side reactions, while also lowering glass transition temperatures, which affects thermal stability and leads to issues like stickiness and unstable product sizes.
Innovation Solution
A novel copolyester with a low softening point is developed using polyethylene 2,5-furandicarboxylic acid (PEF) derived from biomass, which allows for a single modifier to achieve a softening point below 120°C while maintaining a high glass transition temperature, improving thermal stability and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple modifiers are added to lower the softening point of copolyester, then the thermal bonding temperature is reduced, but the process complexity increases and side reactions occur
Solution Approach 1:
The patent changes the chemical composition parameters by using PEF as the main body and combining it with specific diol modifiers (1,4-BDO, 1,6-HD, DEG, NPG, MPDO) in controlled amounts. This parameter optimization allows achieving low softening point (below 120°C) while maintaining process simplicity and reducing side reactions through careful selection of modifier types and concentrations.
2Temperature
If multiple modifiers are added to lower the softening point, then the thermal bonding temperature is reduced, but the glass transition temperature decreases affecting thermal stability
Solution Approach 1:
The patent creates a composite copolyester system combining PEF main body with specific diol modifiers. This composite approach allows the material to exhibit both low softening point (for thermal bonding) and maintained glass transition temperature (for thermal stability). The synergistic combination of PEF and selected modifiers achieves dual performance that neither component could achieve alone.
3Loss of energy
If the softening point is lowered below 120°C, then energy consumption is reduced, but the glass transition temperature drops causing stickiness and unstable product sizes
Solution Approach 1:
The patent optimizes the chemical composition parameters by selecting specific diol modifiers (1,4-BDO, 1,6-HD, DEG, NPG, MPDO) and their concentrations. This parameter control enables achieving softening point below 120°C for energy savings while maintaining glass transition temperature above the threshold to prevent stickiness and ensure stable product dimensions during manufacturing.
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 copolyester achieves lower thermal bonding processing temperatures, reducing energy consumption and enhancing thermal stability, with improved adhesion and processability in applications like polyester fibers and packaging materials.
Implementation Method 1
for a noncrystalline copolyester, the softening point thereof (the temperature at which a noncrystalline polyester is changed into a soft flowing form) is used as a lower limit of a processing temperature
Data Source
AI summary
The present invention relates to a copolyester that includes following structural units:a first chain segment shown in Formula (I):anda second chain segment shown in Formula (II):where the glass transition temperature (Tg) of the copolyester is 60° C. to 83° C. The present invention also provides a polyester fiber or packaging material containing the copolyester.