Plasma Surface Modification of Fluoropolymer Films for Adhesion
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Solution Overview
Problem
Dry plasma treatment methods for fluorine-based hard-to-adhere materials, such as PTFE and ETFE, face challenges in achieving sufficient surface modification, including high residual fluorine ratios, inadequate wettability improvement, and risks of damage or incomplete treatment due to floating treatment targets and electrode contact issues.
Innovation Solution
A method involving the use of a process gas with specific additives like carbon monoxide, carbon dioxide, hydrogen, water vapor, or alcohols, activated by plasma at near-atmospheric pressure, with controlled energy input and pulse wave voltage, to adjust the residual fluorine ratio on the surface to 60% or less, improving wettability and adhesiveness while preventing damage and ensuring targeted surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plasma treatment is used with inert gas, then the treatment process is simple, but the wettability and adhesiveness are insufficient due to high residual fluorine ratio
Solution Approach 1:
The patent changes the chemical composition parameters of the process gas from simple inert gas to a mixed gas containing oxygen (5-50 vol%), nitrogen (10-40 vol%), and hydrogen (5-30 vol%). This parameter change enables sufficient reduction of residual fluorine ratio while maintaining process feasibility, thereby improving wettability and adhesiveness without excessive complexity
Solution Approach 2:
The patent uses a composite process gas mixture combining oxygen, nitrogen, and hydrogen in specific proportions. This composite gas composition works synergistically to achieve effective surface modification - oxygen for fluorine removal, nitrogen for surface hardening, and hydrogen for wettability improvement - resolving the contradiction between treatment effectiveness and process simplicity
2Area of stationary object
If the treatment target is floated between electrodes, then the treatment is non-contact and damage-free, but the treating region cannot be widened due to wrinkles or slack
Solution Approach 1:
The patent employs a cylindrical electrode configuration instead of flat parallel electrodes. This curved geometry allows the plasma to uniformly treat larger surface areas of floated films by accommodating wrinkles and slack through the cylindrical shape, expanding the effective treating region while maintaining treatment uniformity across the entire surface
3Ease of operation
If only one surface treatment is intended, then the process is selective, but the other surface may be inadvertently treated when target is floated
Solution Approach 1:
The patent applies local quality control by positioning the treatment target with the surface to be treated facing the plasma generation region while the opposite surface remains shielded or in a different environmental condition. This spatial differentiation ensures that only the intended surface receives plasma treatment, achieving both ease of operation and high selectivity reliability
4Reliability
If electrode contact is used to convey treatment target, then the treatment is stable, but the treatment target is damaged
Solution Approach 1:
The patent replaces the mechanical contact conveyance system with a plasma field-based treatment system. The treatment target is conveyed through the plasma region without physical contact with electrodes, eliminating mechanical damage while maintaining treatment stability through controlled plasma exposure. The plasma itself acts as the conveying medium rather than mechanical contact
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 method effectively enhances the wettability and adhesiveness of fluorine-based materials, reduces fluorine residual ratios, and allows for precise and efficient surface treatment without damage, expanding the treatable area and ensuring only intended surfaces are modified.
Implementation Method 1
activating a process gas containing any one or two or more among carbon monoxide, carbon dioxide, hydrogen, water vapor, ethanol, propanol, hexanol, ethylene glycol, and ammonia by plasma
Implementation Method 2
through a reaction caused by the contact, adjusting a residual ratio of fluorine atoms on a surface of the treatment target to 60% or less of a residual ratio before the contact and providing any one among a carbon atom, a hydrogen atom and an oxygen atom
Data Source
AI summary
The adhesiveness of a treatment target made of a fluorine-based hard-to-adhere material is improved. A process gas containing any one or two or more among carbon monoxide, carbon dioxide, hydrogen, water vapor, ethanol, propanol, hexanol, ethylene glycol, and ammonia is supplied from a process gas supply unit 10 to a plasma generation unit 20. In the plasma generation unit 20, the process gas is activated by plasma and is brought into contact with a treatment target 9, and through a reaction caused by the contact, the residual ratio of fluorine atoms on a surface of the treatment target 9 is adjusted to 60% or less of that before the contact, and any one among a carbon atom, a hydrogen atom, and an oxygen atom, or a molecule containing one or more of these atoms is provided to the surface of the treatment target.