Continuous Fluorination of Perfluoropolymer Strands
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Solution Overview
Problem
Existing processes for stabilizing unstable terminal groups in perfluoropolymers, such as fluorine gas treatment, face challenges including lengthy treatment times, difficulty in handling solid plates, and batch-type non-continuous processing, which hinder efficient production and productivity.
Innovation Solution
A process involving the melting of thermoplastic perfluoropolymers to form strands, which are then extruded and contacted with fluorine gas at controlled temperatures and concentrations, allowing for continuous fluorination treatment and efficient conversion of unstable terminal groups to stable ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine gas treatment is applied to solid perfluoropolymer sheets or pellets, then unstable terminal groups are stabilized, but treatment time becomes excessively long (several hours)
Solution Approach 1:
The patent changes the physical state parameter of the perfluoropolymer from solid (pellets or sheets) to molten state by heating above the glass transition point, thereby accelerating fluorine diffusion and reducing treatment time from several hours to a much shorter duration while maintaining terminal group stabilization
Solution Approach 2:
The patent utilizes the phase transition from solid to molten state to enhance fluorine gas penetration into the polymer structure. By melting the perfluoropolymer before fluorination, the treatment time is significantly reduced compared to treating solid materials, where fluorine diffusion is extremely slow
2Productivity
If polymer sheets are melted and fluorinated, then treatment efficiency improves, but if the sheet is thick, fluorination of the core takes several hours
Solution Approach 1:
The patent segments the thick polymer sheet into thinner layers or uses fine pellets, increasing the surface area to volume ratio. This segmentation allows fluorine gas to penetrate and treat the core material much more quickly, reducing the several hours required for thick sheet fluorination to a fraction of that time
3Ease of operation
If pellets are used for fluorination, then handling is easier, but fluorine gas diffusion takes time
Solution Approach 1:
The patent changes the temperature parameter by heating pellets above the glass transition point, transforming them from solid to molten state. This parameter change dramatically accelerates fluorine gas diffusion into the polymer matrix, reducing the diffusion time from several hours to a much shorter duration while maintaining the ease of handling pellet form
4Device complexity
If batch type fluorination process is used, then equipment simplicity is maintained, but productivity is low due to non-continuous processing
Solution Approach 1:
The patent enables continuous fluorination processing by maintaining the polymer in a molten state and continuously exposing it to fluorine gas flow. This continuous action eliminates the batch-type intermittent processing, significantly improving productivity while requiring only moderate increases in equipment complexity through the introduction of controlled heating and gas flow systems
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
This method significantly reduces treatment time, enables continuous processing, and produces perfluoropolymers with stabilized terminal groups more efficiently, improving handling and productivity while minimizing contamination risks.
Implementation Method 1
melting a thermoplastic perfluoropolymer to form strands
Implementation Method 2
contacting the polymer strands with a fluorine gas... convert the unstable terminal groups into stable terminal groups
Data Source
AI summary
To provide a process for efficiently producing a perfluoropolymer having unstable terminal groups reduced. A process for producing a fluorination-treated perfluoropolymer, which comprises melting a thermoplastic perfluoropolymer to form strands and contacting the polymer strands with a fluorine gas. For fluorination-treatment of the perfluoropolymer, an apparatus 10 is used, which comprises a melt extruder 11 for melting and extruding the perfluoropolymer, a die 12 for forming the melt extruded polymer into continuous strands 1 and a fluorination tank 13 for contacting the continuous strands 1 with a fluorine gas.