Fluoropolymer Film Adhesion to Rubber Substrates
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Solution Overview
Problem
Existing fluoropolymer films fail to adhere firmly to rubber substrates and withstand the necessary baking temperature, leading to substrate deterioration and inadequate heat resistance in applications like copier and printer rolls.
Innovation Solution
A laminate comprising a substrate with a metal oxide and a functional group-containing fluoropolymer coating layer, specifically a phosphate group-containing fluoropolymer copolymerized with tetrafluoroethylene and perfluoro(alkyl vinyl ether), which provides adequate adhesion and heat resistance when baked at temperatures tolerable by the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoropolymer paint or PFA coating is applied to rubber rollers, then non-stickiness and heat resistance are improved, but adhesion to the rubber substrate deteriorates
Solution Approach 1:
The patent introduces a silane-coupling agent as an intermediary substance between the rubber substrate and the fluoropolymer coating. This coupling agent contains both silicone groups that bond with the rubber substrate and fluoropolymer-compatible groups that bond with the coating, thereby resolving the adhesion problem while maintaining heat resistance and non-stick properties
Solution Approach 2:
The patent creates a composite coating system consisting of rubber substrate, silane-coupling agent layer, and fluoropolymer coating layer. This multi-layer composite structure allows each layer to perform its specific function: the rubber provides flexibility, the silane layer provides adhesion, and the fluoropolymer provides non-stickiness and heat resistance
2Strength
If fluoropolymer is coated using silicone-based adhesive, then adhesion is improved, but heat resistance deteriorates due to poor heat resistance of the silicone adhesive
Solution Approach 1:
The silane-coupling agent layer acts as a thin, sacrificial intermediary that provides sufficient adhesion during the coating process and under operating conditions, but does not compromise the overall heat resistance of the fluoropolymer coating system. The coupling agent layer is designed to be thin enough to not interfere with the heat resistance properties of the main fluoropolymer coating
3Manufacturing precision
If high baking temperature is used to form fluoropolymer film, then film formation and adhesion are improved, but substrate deterioration occurs
Solution Approach 1:
The silane-coupling agent layer serves as a heat-resistant intermediary that allows the fluoropolymer coating to be formed at reduced temperatures. This coupling layer protects the rubber substrate from direct exposure to high baking temperatures while still enabling proper film formation and adhesion of the fluoropolymer coating
4Adaptability or versatility
If rubber rollers are used for fusing systems, then flexibility is maintained, but durability deteriorates due to coating degradation
Solution Approach 1:
The patent creates a durable composite structure where the rubber substrate maintains flexibility while the fluoropolymer coating layer provides long-term durability, non-stickiness, and heat resistance. The silane-coupling agent layer ensures strong bonding between these two components, preventing coating degradation and extending the service life of the roller
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 solution enables the formation of a flexible, heat-resistant fluoropolymer film that adheres firmly to elastomer substrates, maintaining heat resistance during use and extending the lifespan of components like fuser and pressure rolls in copiers and printers.
Implementation Method 1
a laminate, comprising a substrate containing a metal oxide, and a functional group-containing fluoropolymer coating layer formed thereon
Data Source
AI summary
A functionalized fluoropolymer, preferably with phosphate functionality, can be coated on a metal oxide containing rubber substrate, which coating, after heating, results in a fluoropolymer-rubber substrate laminate without degradation of the rubber, and with good adhesion between the fluoropolymer and the rubber.