Amorphous Fluoropolymer Coating Thickness via Heated Solvent Dissolution
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Solution Overview
Problem
Current techniques for coating fluoropolymer resins in liquid core waveguides face challenges in achieving sufficient thickness for light guidance, as existing methods like physical vapor deposition are expensive and limited in thickness, and traditional liquid coating processes struggle to dissolve fluoropolymers like TEFLON AF 2400 to achieve the required 5 micrometer thickness.
Innovation Solution
A method involving dissolving amorphous fluoropolymer resins in heated fluorinated solvents to create a liquid coating solution with increased concentration, which is then applied to a substrate and thermally processed to achieve a coating thickness of 5-10 micrometers, using techniques like spin coating or dip coating, while maintaining low viscosity for efficient application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If physical vapor deposition is used to coat fluoropolymer resins, then coating thickness can be increased, but equipment cost and process complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical/physical vapor deposition system with a chemical solution-based coating system. Instead of using complex vapor deposition equipment to deposit fluoropolymer, the invention dissolves fluoropolymer resin in a solvent to create a coating solution that can be applied by simple dip-coating or spin-coating methods, thereby achieving comparable or superior thickness without complex equipment
Solution Approach 2:
The patent changes the physical state and solubility parameters of the fluoropolymer by using specific solvent systems and temperature control. By heating the coating solution to elevated temperatures (e.g., 60-80°C), the patent increases solvent penetration and resin dissolution, enabling formation of thick, uniform coatings that would not be achievable at room temperature
2Device complexity
If traditional liquid coating processes are used with fluoropolymer resins, then equipment cost is reduced, but coating thickness is insufficient for light guidance
Solution Approach 1:
The patent modifies the temperature parameter of the coating process, using elevated temperatures (60-80°C) during application and drying. This temperature increase enhances solvent evaporation rate and resin film formation, enabling achievement of 5+ micrometer thickness with simple liquid coating equipment
Solution Approach 2:
The patent utilizes the porous structure of the substrate (e.g., anodized aluminum oxide membranes) to facilitate uniform coating deposition. The porous architecture allows the coating solution to penetrate and form thick, uniform fluoropolymer layers through capillary action, achieving light-guiding thickness with simple dip-coating
3Length of stationary object
If fluoropolymer resin concentration in coating solution is increased, then coating thickness improves, but solution viscosity increases making application difficult
Solution Approach 1:
The patent changes the temperature parameter of the coating solution, maintaining it at elevated temperatures (60-80°C) throughout the coating process. This temperature maintenance reduces solution viscosity, enabling high resin concentration formulations to remain fluid and coatable, while still achieving thick coatings upon application and drying
Solution Approach 2:
The patent uses a specifically selected solvent system (e.g., mixtures of fluorinated solvents or combinations with high boiling point solvents) that acts as an intermediary between the fluoropolymer resin and the coating process. These solvents provide optimal dissolution and maintain manageable viscosity even at high resin concentrations, enabling both thick coatings and ease of application
4Reliability
If coating thickness is increased to 5 micrometers or more for light guidance, then optical performance improves, but traditional coating methods cannot achieve sufficient thickness
Solution Approach 1:
The patent employs elevated temperature processing (60-80°C) during coating application and drying to achieve uniform thick coatings. This temperature control ensures complete solvent evaporation and proper resin film formation, consistently producing 5+ micrometer coatings with the uniformity required for reliable light guidance
Solution Approach 2:
The patent uses a continuous coating process where the substrate is dipped into or exposed to the heated coating solution, allowing continuous formation of uniform thick coating layers. This continuous action ensures consistent thickness and quality across the entire substrate surface, achieving the precision required for optical applications
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 allows for the achievement of thicker, more economical fluoropolymer coatings that ensure light guidance in waveguides, providing improved optical performance and mechanical stability without the need for expensive vapor deposition equipment.
Implementation Method 1
dissolving amorphous fluoropolymer resins in heated fluorinated solvents to create a liquid coating solution with increased concentration
Implementation Method 2
Solvent is removed from the applied coating solution to form a coating of amorphous fluoropolymer resin on the substrate
Implementation Method 3
The coating may optionally be subsequently thermally processed
Data Source
AI summary
A coating technique for amorphous fluoropolymer involves adding amorphous fluoropolymer resin to a solvent. The resin solvent mixture is heated to a predetermined temperature above room temperature. The amorphous fluoropolymer resin is dissolved in a heated solvent, and the liquid coating solution is applied to a substrate. The solvent is then removed from the applied liquid coating solution. The coating technique may be employed in connection with liquid core waveguides.