ETFE Copolymer Composition for Heat-Resistant Melt Molding
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Solution Overview
Problem
Existing ethylene/tetrafluoroethylene copolymers face issues with dispersion uniformity of acid acceptors, gelation and pyrolysis during high-temperature melt molding, and poor heat resistance and mechanical properties, necessitating improvements in melt-fabricability and heat resistance.
Innovation Solution
The copolymer satisfies specific conditions on loss tangents and intensity ratios of functional groups determined by Fourier transform infrared spectroscopy, with a balanced ethylene/tetrafluoroethylene ratio and controlled polymerization conditions to enhance heat resistance and melt-fabricability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ethylene/tetrafluoroethylene copolymers are used for high-temperature melt molding, then processing can be performed, but gelation and pyrolysis occur during molding, degrading heat resistance and mechanical properties
Solution Approach 1:
The patent applies parameter changes by precisely controlling the loss tangent ratio (tanδ60/tanδ5) within 75-225 and the functional group intensity ratio (β) within 0.50-0.80. These parameter optimizations prevent gelation and pyrolysis during high-temperature molding while maintaining excellent heat resistance, resolving the contradiction between processability and stability at elevated temperatures.
Solution Approach 2:
The patent employs feedback control through dynamic mechanical analysis to measure and control the loss tangent at different temperatures and times. By monitoring tanδ values at 320°C after 5 and 60 minutes, and adjusting the copolymer composition accordingly, the invention ensures optimal heat resistance and prevents degradation during molding.
2Ease of manufacture
If existing copolymer compositions are used, then basic molding is possible, but dispersion uniformity of acid acceptors is poor, affecting quality stability
Solution Approach 1:
The patent optimizes the functional group intensity ratio (β) representing carboxylic acid groups within 0.50-0.80, which enhances the dispersion uniformity of acid acceptors like copper oxide. This parameter control ensures homogeneous distribution of additives during molding, improving both manufacturability and quality stability of the final product.
3Temperature
If copolymers with improved heat resistance are used, then thermal stability increases, but melt-fabricability and mechanical properties deteriorate
Solution Approach 1:
The patent achieves the balance between heat resistance and melt-fabricability by controlling the loss tangent ratio (tanδ60/tanδ5) within 75-225. This parameter optimization ensures sufficient thermal stability for high-temperature applications while maintaining adequate melt flow and fabricability for practical manufacturing processes.
Solution Approach 2:
Through feedback control using dynamic mechanical analysis, the patent monitors the viscoelastic properties (loss tangent) at processing temperatures and adjusts copolymer composition accordingly. This ensures optimal balance between heat resistance and melt-fabricability, preventing both excessive rigidity and insufficient thermal stability.
4Strength
If copolymers with higher mechanical strength are used, then structural integrity improves, but melt moldability and processing ease worsen
Solution Approach 1:
The patent controls the functional group intensity ratio (β) within 0.50-0.80 to optimize the balance between mechanical strength and melt moldability. This parameter adjustment ensures adequate structural integrity while maintaining sufficient melt flow characteristics for easy processing and molding operations.
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 resulting copolymer exhibits reduced gelation and pyrolysis, improved mechanical properties, and excellent heat resistance, minimizing foreign substance generation during high-temperature molding.
Implementation Method 1
tanδ(5): a loss tangent after five minutes from start of measurement in dynamic mechanical analysis in an air atmosphere at 320°C; and tanδ(60): a loss tangent after 60 minutes from the start of measurement in the dynamic mechanical analysis in the air atmosphere at 320°C
Implementation Method 2
peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a -CF2H group, a -CF2CH2COF group, a -COF group, a -COOH group
Implementation Method 3
peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from functional groups
Data Source
AI summary
The invention provides an ethylene/tetrafluoroethylene copolymer having excellent melt-fabricability and excellent heat resistance. The invention relates to an ethylene/tetrafluoroethylene copolymer satisfying the following formula (1). Peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a -CF2H group, a - CF2CH2COF group, a -COF group, a -COOH group, a dimer of a -CF2COOH group and a monomer of a CF2CH2COOH group, a - COOCH3 group, a -CONH2 group, and a -CH2OH group satisfy the following formula (2). 75≤tanδ60/tanδ5×100≤225 wherein tanδ(5) : a loss tangent after five minutes from start of measurement in dynamic mechanical analysis in an air atmosphere at 320°C; and tanδ(60) : a loss tangent after 60 minutes from the start of measurement in the dynamic mechanical analysis in the air atmosphere at 320°C. PIA/PIB+PIC+PID+PIE+PIF+PIG+PIH≥0.60 wherein PIA: the peak intensity of vibration derived from the -CF2H group; PIB: the peak intensity of vibration derived from the -CF2CH2COF group; PIC: the peak intensity of vibration derived from the -COF group; PID: the peak intensity of vibration derived from the -COOH group; PIE: the peak intensity of vibration derived from the dimer of the -CF2COOH group and the monomer of the CF2CH2COOH group; PIF: the peak intensity of vibration derived from the -COOCH3 group; PIG: the peak intensity of vibration derived from the -CONH2 group; and PIH: the peak intensity of vibration derived from the -CH2OH group.