Fluorinated Ether Lubricant for Thin Magnetic Recording Layers
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Solution Overview
Problem
The challenge is to reduce the thickness of the lubricating layer in magnetic recording media to enhance recording density while maintaining corrosion resistance and preventing spin-off, which occurs due to reduced thickness, thereby ensuring the lubricating layer's functionality.
Innovation Solution
A fluorine-containing ether compound with a specific divalent linking group structure, represented by Formula (2), is used to form a lubricating layer that enhances adhesion to the protective layer, reducing thickness and suppressing spin-off through optimal interactions of polar groups and flexibility, ensuring good corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of the lubricating layer is reduced to increase recording density, then the recording capacity is improved, but the corrosion resistance and spin-off suppression are deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricant by introducing fluorine-containing ether compounds with specific molecular structures (Formula 1 and Formula 2) containing perfluoropolyether chains and divalent linking groups. This chemical parameter change enables the formation of a thinner lubricating layer that maintains adequate corrosion resistance and spin-off suppression properties.
Solution Approach 2:
The patent employs composite molecular structures combining perfluoropolyether chains with divalent linking groups containing hydroxy groups. This composite structure allows the lubricant to achieve multiple functions (lubrication, corrosion resistance, spin-off suppression) in a thinner layer configuration.
2Productivity
If the thickness of the lubricating layer is reduced to enhance recording density, then the recording capacity is improved, but the spin-off suppression is deteriorated
Solution Approach 1:
The patent modifies the molecular parameters of the lubricant by incorporating fluorine-containing ether compounds with specific structures (Formula 1 and Formula 2). These structural changes enable the lubricant to form a thinner film that effectively suppresses spin-off through enhanced adhesion to the protective layer.
Solution Approach 2:
The patent uses composite molecular architecture combining perfluoropolyether chains with divalent linking groups. This composite structure provides both the thin-film capability for high density recording and the spin-off suppression through strong interfacial adhesion.
3Reliability
If a conventional lubricant is used to maintain corrosion resistance, then the corrosion resistance is preserved, but the lubricating layer thickness cannot be reduced
Solution Approach 1:
The patent changes the chemical composition of the lubricant from conventional compounds to fluorine-containing ether compounds with specific molecular structures. This parameter change enables the lubricating layer to be thinner while maintaining corrosion resistance through the unique properties of the fluorinated structure.
Solution Approach 2:
The patent employs composite molecular structures with perfluoropolyether chains and divalent linking groups that provide both corrosion resistance and reduced thickness capability, overcoming the limitation of conventional lubricants.
4Productivity
If the lubricating layer is made thinner to reduce magnetic head floating, then the head floating is reduced, but the lubrication effectiveness is compromised
Solution Approach 1:
The patent modifies the molecular parameters of the lubricant by using fluorine-containing ether compounds with structures (Formula 1 and Formula 2). These changes enable the formation of an ultrathin lubricating layer that maintains adequate lubrication effectiveness through enhanced molecular adhesion and film stability.
Solution Approach 2:
The patent uses composite molecular architecture combining perfluoropolyether chains with divalent linking groups containing hydroxy groups. This composite structure provides superior adhesion to the protective layer, ensuring lubrication effectiveness even in a thinner layer configuration.
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 fluorine-containing ether compound forms a lubricating layer with excellent corrosion resistance and high spin-off suppression, allowing for a thinner layer that maintains effective lubrication and reduces magnetic head floating, thereby improving the reliability and durability of magnetic recording media.
Implementation Method 1
enhances adhesion to the protective layer
Implementation Method 2
forms a lubricating layer that enhances adhesion to the protective layer, reducing thickness and suppressing spin-off
Data Source
AI summary
A fluorine-containing ether compound represented by the following formula. R1—CH2—R2[—CH2—R3—CH2—R2]x—CH2—R4 (x is 1 or 2, R2 is a perfluoropolyether chain, R3 is represented by Formula (2), and R1 and R4 are each a terminal group having 1 to 50 carbon atoms, which has 1 to 4 polar groups, and in Formula (2), a1 and a2 are each 0 to 5, b is 0 or 1, and Y is an acyclic divalent saturated hydrocarbon group having 2 to 8 carbon atoms)