PVDF Copolymer Crosslinking Efficiency and Color Stability
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Solution Overview
Problem
Current e-beam crosslinking technologies for PVDF copolymers are hindered by high capital costs and degradation of properties, particularly color stability, due to the need for high radiation doses, which limits their use in high-temperature applications.
Innovation Solution
A PVDF copolymer composition with a high level of fluorinated comonomer and high molecular weight, capable of efficient crosslinking at lower e-beam doses, achieving improved crosslinking efficiency and thermal stability without the use of coagents, and further reducing radiation dosage with their addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high e-beam radiation doses are used for crosslinking PVDF copolymers, then crosslinking efficiency is achieved, but capital costs increase and color stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the PVDF copolymer by incorporating specific comonomers (hexafluoropropene, tetrafluoroethylene, or trifluoroethylene) in controlled amounts (1-20 mol%). This compositional modification enables the polymer to achieve effective crosslinking at lower e-beam radiation doses (5-20 Mrad), thereby reducing the harmful effects of high radiation exposure while maintaining crosslinking efficiency.
2Reliability
If high e-beam radiation doses are used for crosslinking PVDF copolymers, then crosslinked structure is formed, but production costs increase
Solution Approach 1:
The patent modifies the polymer composition parameters by incorporating fluorinated comonomers that enhance crosslinking efficiency. This allows the formation of a thermoset crosslinked structure at reduced e-beam radiation doses (5-20 Mrad), directly lowering production costs while achieving the desired structural transformation from thermoplastic to thermoset.
3Reliability
If high e-beam radiation doses are used for crosslinking PVDF copolymers, then crosslinking is achieved, but productivity decreases
Solution Approach 1:
The patent changes the molecular composition parameters of the PVDF copolymer by incorporating specific fluorinated comonomers in optimized amounts. This compositional adjustment increases crosslinking efficiency, enabling effective crosslinking at lower radiation doses (5-20 Mrad), which reduces processing time and increases production capacity while maintaining the desired crosslinked structure.
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 composition enables effective crosslinking at significantly lower radiation doses, enhancing thermal stability and color retention, thereby reducing production costs and increasing productivity while maintaining desired properties in high-temperature applications.
Implementation Method 1
PVDF thermoplastic resins in wire and cable applications have been cross-linked by e-beam radiation since the 1950's
Implementation Method 2
Producers, using e-beam crosslinking of PVDF face two primary challenges associated with this technology
Data Source
AI summary
The invention relates to polyvinylidene fluoride (PVDF) copolymer compositions that have improved crosslinking efficiency and performance. The PVDF copolymer contains a high level (>14 and preferably greater than 16 wt %) of a fluorinated comonomer, and has a high molecular weight as measured by the melt viscosity at 230° C. and 100 sec−1 of 18 to 40 kpoise. The composition can be effectively cross-linked with a low level radiation (high cross-linking efficiency). The cross-linked composition is useful in high-temperature applications, such as automotive wire and cable, and heat shrink tubing.