Fluorine Ether Lubricant for Magnetic Media Floating Height
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Solution Overview
Problem
There is a demand for a lubricating layer in magnetic recording media that can reduce the floating height of magnetic heads while maintaining corrosion resistance and floating stability, even with a thin thickness.
Innovation Solution
A fluorine-containing ether compound with a specific molecular structure, including perfluoropolyether chains and divalent linking groups with polar groups, is used to form a lubricating layer that enhances corrosion resistance and floating stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricating layer is reduced to decrease floating height, then the floating height of magnetic head is decreased, but the corrosion resistance of the magnetic recording medium tends to decrease
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricant by incorporating fluorine-containing ether compounds with specific molecular structures (containing perfluoropolyether chains and polar groups). This chemical parameter change enables the formation of a thin lubricating layer that maintains high corrosion resistance despite reduced thickness, thereby resolving the contradiction between decreasing floating height and maintaining corrosion resistance.
Solution Approach 2:
The patent uses composite molecular structures combining perfluoropolyether chains (which provide low friction and lubrication) with polar groups (which enhance adhesion and corrosion resistance). This composite material approach allows the thin lubricating layer to simultaneously achieve low floating height and high corrosion resistance by integrating multiple functional properties at the molecular level.
2Length of moving object
If the thickness of the lubricating layer is reduced to decrease floating height, then the floating height of magnetic head is decreased, but projections that reduce floating stability are likely to be formed
Solution Approach 1:
The patent modifies the molecular parameters of the lubricant by using fluorine-containing ether compounds with controlled molecular weight (400-10,000) and specific structural parameters. These parameter changes ensure uniform film formation at thin thicknesses, preventing projection formation and maintaining floating stability while achieving reduced floating height.
Solution Approach 2:
The patent promotes homogeneity in the lubricating layer by using fluorine-containing ether compounds that form uniform films on the magnetic recording medium surface. The molecular structure (combining flexible perfluoropolyether chains with polar groups) ensures homogeneous distribution and adhesion, preventing localized projections that would compromise floating stability even when the layer is thin.
3Length of moving object
If a thin lubricating layer is formed to decrease floating height, then the floating height of magnetic head is decreased, but the effect of inhibiting corrosion becomes insufficient
Solution Approach 1:
The patent changes the chemical parameters of the lubricant by incorporating fluorine-containing ether compounds with specific functional groups (hydroxyl, amino, carboxy, or sulfo groups) and controlled molecular weights. These parameter changes enhance the chemical reactivity and adhesion properties, enabling the thin lubricating layer to maintain strong corrosion inhibition effects despite reduced physical thickness.
Solution Approach 2:
The patent extracts and emphasizes the key functional components (polar groups and perfluoropolyether chains) within the lubricant molecule. By concentrating these active functional groups in the molecular structure, the patent achieves high corrosion resistance in a thin film, as the polar groups provide strong chemical adhesion to the magnetic recording medium surface, preventing corrosion without requiring thick physical barriers.
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 effectively forms a thin lubricating layer that inhibits corrosion and improves floating stability of magnetic heads, allowing for reduced thickness without compromising performance.
Implementation Method 1
a lubricant is applied to the surface of the protective layer to form a lubricating layer
Data Source
AI summary
A fluorine-containing ether compound is provided which is represented by the following formula: R1—R2—CH2—R3a—CH2—R4a—CH2—R3b—CH2—R4b—CH2—R3c—CH2—R5—R6 (R3a, R3b, and R3c are perfluoropolyether chains; R2, R4a, R4b, and R5 are a divalent linking group having at least one selected from the group consisting of a hydroxyl group, an amino group, a carboxy group, and a sulfo group; R2 has an oxygen atom at an end that is bonded to R1; R5 has an oxygen atom at an end that is bonded to R6; R1 and R6 are an organic group having 1 to 50 carbon atoms or a hydrogen atom, and at least one of them is a group in which a cyano group is bonded to a carbon atom of an organic group having 1 to 8 carbon atoms).