Fluorine-Containing Ether Lubricant for Thin Layers on Magnetic Media
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Solution Overview
Problem
Existing magnetic recording media face challenges in achieving reduced floating amounts of the magnetic head while maintaining sufficient corrosion resistance and floating stability, particularly when the lubricating layer thickness is reduced.
Innovation Solution
A fluorine-containing ether compound with a specific structure, represented by Formula (1), is used to form a lubricating layer that includes four perfluoropolyether chains bonded through divalent linking groups with polar groups, ensuring even adhesion and coating, thereby enhancing floating stability and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricating layer is reduced to decrease the floating amount of the magnetic head, then the floating amount of the magnetic head is reduced, but the corrosion resistance of the magnetic recording medium is decreased and the floating stability of the magnetic head becomes insufficient
Solution Approach 1:
The invention 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 an ultra-thin lubricating layer that maintains both corrosion resistance and floating stability while reducing the floating amount of the magnetic head.
Solution Approach 2:
The invention uses composite molecular structures combining perfluoropolyether chains (which provide low friction and wear resistance) with polar groups (which provide adhesion to the protective layer). This composite structure at the molecular level creates a lubricating layer with multiple functions: ultra-thin thickness, good adhesion, corrosion resistance, and floating stability, resolving the contradiction between thinness and reliability.
2Ease of operation
If conventional lubricants are used to form a lubricating layer, then the magnetic recording medium can operate, but the floating stability of the magnetic head is insufficient and the corrosion resistance is not sufficient when the layer is thin
Solution Approach 1:
The invention modifies the chemical parameters of the lubricant by using fluorine-containing ether compounds with specific structures (containing perfluoropolyether chains and polar groups). This enables the formation of an ultra-thin lubricating layer with improved adhesion, floating stability, and corrosion resistance compared to conventional lubricants.
Solution Approach 2:
The invention creates local quality differences within the lubricating layer by positioning polar groups toward the protective layer for strong adhesion and perfluoropolyether chains toward the magnetic head for low friction. This spatial arrangement of different functional groups within the same layer provides both excellent adhesion and lubrication properties simultaneously.
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 allows for a thin lubricating layer with improved floating stability and high corrosion suppression, ensuring the magnetic recording medium's reliability and durability.
Implementation Method 1
the fluorine-containing ether compound allows for a thin lubricating layer with improved floating stability and high corrosion suppression
Implementation Method 2
a lubricant that contains a compound having a polar group such as a hydroxy group and an amino group at a terminal of a fluorine-based polymer having a repeating structure including —CF2—
Implementation Method 3
terminal groups having a polar group are bonded to both terminals of the skeleton through a methylene group
Data Source
AI summary
A fluorine-containing ether compound represented by the following formula. R1—CH2—R2a—CH2—R3a—CH2—R2b—CH2—R3b—CH2—R2c—CH2—R3c—CH2—R2d—CH2—R4 (R2a, R2b, R2c and R2d are each a perfluoropolyether chain, R3a, R3b, and R3c are each a divalent linking group having one or more polar groups, at least one of R3a, R3b, and R3c is represented by —OCH2CH(OH)CH2O—, and R1 and R4 are each a terminal group having 1 to 50 carbon atoms and one or more polar groups, and may be the same as or different from each other)