Random Amorphous Copolyester Heat Shrink Range
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Solution Overview
Problem
Current amorphous copolyesters, such as PETG, are ineffective at higher temperature shrinkage, limiting their application in heat-shrinkable films and packaging materials.
Innovation Solution
A random amorphous copolyester is developed, comprising a diacid monomer and a diol monomer, specifically terephthalic acid and ethylene glycol or cyclohexanedimethanol, with varying ratios of aromatic and aliphatic units, allowing for a wide range of glass transition and heat-shrink temperatures through esterification and polycondensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional amorphous copolyester (PETG) is used, then good heat-shrinkable properties are achieved at lower temperatures, but it cannot effectively shrink at higher temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the copolyester by incorporating multiple diacid monomers (terephthalic acid, isophthalic acid, cyclohexanedimethanol) and diol monomers in specific molar ratios. By adjusting these compositional parameters, the glass transition temperature and heat-shrink temperature range are expanded from the conventional narrow range to -20°C to 150°C, enabling effective shrinkage across a wide temperature spectrum
Solution Approach 2:
The patent creates a composite copolyester structure by combining multiple monomer units (terephthalic acid, isophthalic acid, cyclohexanedimethanol, ethylene glycol) into a single polymer chain. This composite material approach allows the integration of different functional units that contribute to both low-temperature and high-temperature shrinkage properties, achieving a synergistic effect that neither monomer could provide alone
2Ease of operation
If PVC is used for heat-shrinkable films, then good heat-shrinkable properties are achieved, but incineration generates hydrogen chloride causing corrosion and environmental pollution
Solution Approach 1:
The patent replaces PVC, which generates harmful hydrogen chloride during incineration, with an amorphous copolyester composed of terephthalic acid, isophthalic acid, and cyclohexanedimethanol. This substitution converts a harmful material into a beneficial eco-friendly alternative that maintains excellent heat-shrinkable properties while eliminating corrosive emissions and environmental pollution during disposal
Solution Approach 2:
The patent develops a disposable packaging material (amorphous copolyester) that is environmentally friendly and safe for incineration. Unlike PVC that causes corrosion and pollution when disposed of, this copolyester can be safely incinerated without generating harmful substances, making it suitable for single-use packaging applications where disposal is a critical consideration
3Object-generated harmful factors
If amorphous copolyester is used to replace PVC, then environmental pollution is reduced, but the glass transition temperature range is limited
Solution Approach 1:
The patent expands the glass transition temperature range by modifying the chemical composition parameters of the copolyester. By incorporating cyclohexanedimethanol (which has flexible aliphatic structure) along with aromatic monomers, and by adjusting their molar ratios, the glass transition temperature can be tuned across a wide range from -20°C to 150°C, providing adaptability for various application requirements while maintaining environmental friendliness
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 new copolyester achieves a wide range of glass transition temperatures from -20°C to 150°C, enhancing its application in packaging, containers, and films by providing improved heat-shrinkable properties.
Implementation Method 1
subjecting the mixture to esterification and polycondensation to form the random amorphous copolyester
Implementation Method 2
subjecting the mixture to esterification and polycondensation to form the random amorphous copolyester
Implementation Method 3
achieving a wide range of glass transition temperatures from -20°C to 150°C
Implementation Method 4
enhancing its application in packaging, containers, and films by providing improved heat-shrinkable properties
Data Source
AI summary
A random amorphous copolyester is synthesized by using diacid monomers and diol monomers. The random amorphous copolyester has a structure of the formula (I):wherein R1, R2 is an aromatic or aliphatic monomer, A is 0-0.8, B is 0-0.8, C is 0-1, D is 0-1, E is 0-0.8, F is 0-0.8, C+D<0.2 and A+B+E+F<0.8. The diacid monomer comprises TPA and an aromatic or aliphatic diacid monomer, the diol monomer comprises EG, 1,3 and 1,4-CHDM, and an aromatic or aliphatic diol monomer.