Fluorine-Containing Ether Lubricant for Thin Magnetic Media
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Solution Overview
Problem
Existing magnetic recording media face challenges in reducing the thickness of the lubricating layer without degrading coatability and chemical substance resistance, and the adhesion between the lubricating layer and protective layer is insufficient, leading to potential pickup issues with the magnetic head.
Innovation Solution
A fluorine-containing ether compound represented by Formula (1) is used to form a lubricating layer with a thickness of 0.5 nm to 2.0 nm, featuring a perfluoropolyether chain and polar groups, which enhances adhesion and chemical substance resistance by incorporating a condensed aromatic group that interacts strongly with the protective layer, reducing pickup and maintaining reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricating layer is reduced to improve recording density, then the floating amount of the magnetic head is reduced, but the coatability of the lubricating layer is degraded and chemical substance resistance is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating layer by using fluorine-containing ether compounds with specific molecular structures (Formula 1 and Formula 2) containing polar groups. This allows achieving adequate chemical substance resistance and coatability even at reduced thickness of 0.5 nm to 2.0 nm, resolving the contradiction between thinning the layer and maintaining reliability.
Solution Approach 2:
The patent employs composite molecular structures combining fluorine-containing ether chains with polar groups (such as hydroxy, amino, or carboxy groups). This composite approach enables the lubricating layer to maintain both thin profile and high chemical substance resistance, as the polar groups enhance adhesion and chemical resistance while the fluorine-containing ether provides lubrication.
2Length of moving object
If the thickness of the lubricating layer is reduced, then the floating amount of the magnetic head is reduced, but the adhesion between the lubricating layer and protective layer is insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the lubricant by incorporating fluorine-containing ether compounds with polar functional groups (Formula 1 and Formula 2). These polar groups enhance the adhesion strength between the lubricating layer and protective layer, allowing the layer to be thin (0.5-2.0 nm) while maintaining adequate bonding strength to prevent pickup.
3Length of moving object
If the thickness of the lubricating layer is reduced, then the floating amount of the magnetic head is reduced, but pickup is likely to occur
Solution Approach 1:
The patent changes the chemical composition to fluorine-containing ether compounds with polar groups (Formula 1 and Formula 2), which enhance adhesion to the protective layer. This prevents pickup of the lubricating layer onto the magnetic head even when the layer thickness is reduced to 0.5 nm to 2.0 nm, thereby reducing harmful pickup effects.
4Ease of operation
If conventional fluorine-based polymer lubricants are used, then lubrication is provided, but the adhesion to the protective layer is insufficient and chemical substance resistance is degraded
Solution Approach 1:
The patent uses composite molecular structures combining fluorine-containing ether chains (providing lubrication and slidability) with polar functional groups (Formula 1 and Formula 2, providing enhanced adhesion and chemical substance resistance). This composite approach resolves the contradiction between maintaining ease of operation and improving reliability.
Solution Approach 2:
The patent modifies the chemical parameters of the lubricant by introducing polar functional groups (hydroxy, amino, or carboxy groups) into the fluorine-containing ether structure. This changes the surface properties to enhance both adhesion to the protective layer and chemical substance resistance, while preserving the lubrication properties provided by the fluorine-containing ether chain.
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 chemical substance resistance and suppressed pickup, ensuring the magnetic recording medium has improved reliability and durability even with reduced thickness.
Implementation Method 1
the adhesion between the lubricating layer, which covers the surface of the protective layer, and the protective layer is insufficient
Implementation Method 2
a fluorine-containing ether compound which is represented by Formula (1)... featuring a perfluoropolyether chain and polar groups, which enhances adhesion
Data Source
AI summary
Provided is a fluorine-containing ether compound represented by the following formula. R1—R2—CH2—R3[—CH2—R4—CH2—R3]n—CH2—R5—R6 (n represents an integer of 0 to 2, R3 represents a perfluoropolyether chain, R4, R2, and R5 represent a divalent linking group having one or more polar groups, R2 and R5 have an oxygen atom at an end bonded to R1 or R6, R1 and R6 represent an organic group having 1 to 50 carbon atoms or a hydrogen atom, at least one of R1 or R6 is represented by Formula (2), one of X and Y represents C═O, and the other represents —NH—, —NR7— (R7 represents a hydrocarbon group having 1 to 8 carbon atoms), or —O—, Q represents a 5- to 8-membered heterocyclic ring structure, which is formed of a carbon atom of a linking group indicated by a dashed arc together with X and Y, and Z represents 0 to 5 substituents.)