Fluorine Ether Lubricant for Magnetic Head Wear Resistance
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Solution Overview
Problem
Magnetic recording devices face challenges in achieving both reduced floating height of the magnetic head and maintaining satisfactory wear resistance of the lubricant layer, as reducing the thickness of the lubricant layer often deteriorates its coating properties and wear resistance.
Innovation Solution
A fluorine-containing ether compound with a specific structure, featuring an alkenyloxy or alkynyloxy group and a linking group with a polar group, is used to form a lubricant layer that separates the polar group from the terminal group by an appropriate distance, enhancing wear resistance even at reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricant layer is reduced to lower floating height, then the floating height is reduced, but the coating properties and wear resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricant by introducing a fluorine-containing ether compound with specific molecular structure (formula 1), where the separation distance between polar groups and terminal groups is controlled by parameters b (1-5) and a (1-3). This parameter optimization enables the lubricant to form an effective protective layer at reduced thickness while maintaining wear resistance.
Solution Approach 2:
The lubricant layer is formed using a composite chemical structure combining fluorine-containing perfluoropolyether chain (R3) with polar groups (R2) and terminal groups (R1) separated by specific linking structures. This composite molecular design creates a lubricant that simultaneously achieves thin film formation and high wear resistance through the synergistic effect of different functional groups.
2Length of moving object
If the thickness of the lubricant layer is reduced, then the floating height is reduced, but the coating properties deteriorate
Solution Approach 1:
The patent optimizes molecular parameters including the chain length of perfluoropolyether (R3), the number of repeating units (a, b), and the structure of terminal groups (R1) to control the lubricant's coating behavior. These parameter adjustments enable uniform coating at reduced thickness while preventing defects.
3Reliability
If conventional fluorine-based polymer lubricants are used, then wear resistance is improved, but the lubricant layer thickness must be increased, increasing floating height
Solution Approach 1:
The patent fundamentally changes the chemical structure parameters from conventional fluorine-based polymers to fluorine-containing ether compounds with formula (1), where the specific arrangement of polar groups and terminal groups separated by controlled distances enables high wear resistance at reduced thickness, eliminating the need to increase layer thickness.
Solution Approach 2:
The invention uses a composite molecular structure combining hydrophobic perfluoropolyether chains with polar and terminal groups in a specific architecture, creating a lubricant that achieves superior wear resistance at thinner film thickness compared to conventional homogeneous fluorine-based polymers.
Data Source
AI summary
This fluorine-containing ether compound is a fluorine-containing ether compound represented by formula (1).R1—X—R2—CH2—R3—CH2—R4 (1)(In formula (1), R1 is an alkenyloxy group of 2 to 8 carbon atoms or an alkynyloxy group of 3 to 8 carbon atoms. R2 is represented by formula (2) shown below. In formula (2), a represents an integer of 1 to 3. X is represented by formula (3) shown below. In formula (3), b represents an integer of 1 to 5, Y is a divalent linking group that is bonded to a carbon atom in formula (2), and R represents an alkyl group of 1 to 6 carbon atoms or H. R3 represents a perfluoropolyether chain. R4 represents a terminal group containing two or three polar groups, wherein each polar group is bonded to a different carbon atom, and the carbon atoms to which the polar groups are bonded are bonded to each other via a linking group containing a carbon atom to which a polar group is not bonded.)