Fluorinated Ether Lubricant for Low-Flying Magnetic Media
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Solution Overview
Problem
The challenge is to reduce the thickness of lubricating layers in magnetic recording media while maintaining sufficient corrosion resistance, particularly after a tape burnishing process, to achieve lower flying heights in magnetic recording/reproducing devices.
Innovation Solution
A fluorine-containing ether compound with a specific chain skeleton and terminal groups is used to form a lubricating layer, enhancing adhesion and corrosion resistance by incorporating perfluoropolyether chains and polar groups that interact effectively with the protective layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of lubricating layers is reduced to achieve lower flying heights, then the flying height decreases, but the corrosion resistance becomes insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricant by specifying a fluorine-containing ether compound with particular molecular structure (Formula 1), where R2, R4, and R6 are perfluoropolyether chains and R3, R5 are linking groups with specific structural constraints. This parameter change enables achieving adequate corrosion resistance even at reduced lubricating layer thicknesses of 0.5 nm to 2.0 nm
Solution Approach 2:
The invention employs a composite molecular structure combining perfluoropolyether chains (R2, R4, R6) with specific linking groups (R3, R5) and terminal groups (R1, R7). This composite structure provides both the thin film capability for low flying height and the corrosion protection through the synergistic combination of fluorinated chains and polar terminal groups
2Length of moving object
If the thickness of lubricating layers is reduced, then the flying height decreases, but the adhesion to protective layer becomes insufficient
Solution Approach 1:
The invention modifies the molecular structure parameters by defining specific constraints on the linking groups R3 and R5 in Formula (1), where these groups contain carbon atoms and hydrogen atoms in specific ratios. This structural parameter optimization ensures strong adhesion to the protective layer while maintaining thin film thickness for low flying height
Solution Approach 2:
The invention applies local quality by differentiating the functional regions of the molecule: the perfluoropolyether chains (R2, R4, R6) provide lubrication and thickness control, while the terminal groups R1 and R7 with polar groups provide enhanced adhesion to the protective layer. This localized functional differentiation achieves both low flying height and strong adhesion
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 lubricating layer formed with this compound exhibits high corrosion resistance, improving the reliability and durability of magnetic recording media by preventing corrosion and ensuring effective adhesion to the protective layer.
Implementation Method 1
enhancing adhesion and corrosion resistance by incorporating perfluoropolyether chains and polar groups that interact effectively with the protective layer
Data Source
AI summary
The present invention provides a fluorine-containing ether compound represented by the following formula.R1—CH2—R2—CH2—R3—CH2—R4—CH2—R5—CH2—R6—CH2—R7 (In Formula (1), R2, R4, and R6 are perfluoropolyether chains, R3 is Formula (2), R5 is Formula (3), and R1 and R7 are each independently a terminal group having two or three polar groups, in which individual polar groups are bound to different carbon atoms and the carbon atoms to which the polar groups are bound are bound to each other via a linking group containing a carbon atom to which no polar group is bound).