Fluorine-Containing Ether Lubricant Layers for Thin Magnetic Recording Media
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Solution Overview
Problem
Existing magnetic recording media face challenges in achieving reduced lubricating layer thickness while maintaining chemical substance resistance, wear resistance, and corrosion resistance, as thinner layers often result in insufficient adhesion and increased susceptibility to environmental contaminants.
Innovation Solution
A fluorine-containing ether compound with specific end groups and polar linking groups, including an N,N-substituted amide, is used to form a lubricating layer that enhances adhesion to the protective layer, reducing interactions between polar groups and improving corrosion resistance and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
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 chemical substance resistance and wear resistance of the magnetic recording medium are degraded
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricating layer by using a fluorinated ether compound with specific molecular structure (Formula 1) containing perfluorinated backbone and polar end groups. This compositional parameter change enables the formation of a thinner lubricating layer that maintains adequate chemical substance resistance and wear resistance, thus resolving the contradiction between improving recording density and maintaining reliability.
Solution Approach 2:
The invention employs a composite molecular structure in the lubricating layer that combines the perfluorinated ether backbone (providing chemical inertness and lubricity) with polar end groups containing hydroxy, carboxy, or amide groups (providing adhesion to the magnetic layer). This composite material approach allows the lubricating layer to simultaneously achieve thin thickness, chemical substance resistance, and wear resistance.
2Productivity
If the thickness of the lubricating layer is reduced, then the floating amount of the magnetic head is reduced, but the corrosion resistance of the magnetic recording medium becomes insufficient
Solution Approach 1:
The invention modifies the chemical composition of the lubricating layer by incorporating fluorinated ether compounds with specific end groups (hydroxy, carboxy, or amide) that provide corrosion protection. This parameter change in chemical composition enables the lubricating layer to maintain adequate corrosion resistance even at reduced thickness, thus resolving the contradiction between improving recording density and maintaining corrosion resistance.
Solution Approach 2:
The polar end groups (hydroxy, carboxy, amide) that could potentially increase hydrophilicity and water attraction are strategically positioned at the molecular level to provide corrosion protection through adhesion to the magnetic layer and formation of a protective interface, converting what could be a harmful effect into a beneficial corrosion-resistant property.
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 improved adhesion, uniform coating, and high corrosion suppression, enabling reduced thickness without compromising chemical substance or wear resistance.
Implementation Method 1
A fluorine-containing ether compound with specific end groups and polar linking groups, including an N,N-substituted amide, is used to form a lubricating layer that enhances adhesion to the protective layer
Implementation Method 2
the chemical substance resistance and the wear resistance of the magnetic recording medium are degraded
Implementation Method 3
the corrosion resistance of the magnetic recording medium may be insufficient
Data Source
AI summary
Provided is a fluorine-containing ether compound represented by the following formula. R1—O—R2—CH2—R3—CH2—R4—O—R5 (R3 represents a perfluoropolyether chain, R2 and R4 represent a divalent linking group having one or more polar groups, R1 and R5 represent Formula (2), Formula (3), or a hydrogen atom, and at least one of R1 or R5 is represented by Formula (2) or (3), in Formula (2), X1 represents an alkylene group having 1 to 30 carbon atoms, and Y and Z represent an aliphatic group having 1 to 30 carbon atoms, in Formula (3), X2 represents an alkylene group having 1 to 30 carbon atoms, and A and B represent an aliphatic group having 1 to 30 carbon atoms.)