Hydroxy-Linked Perfluoropolyether Lubricant for Magnetic Media
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Solution Overview
Problem
Existing magnetic recording media face challenges in reducing the floating height of the magnetic head while maintaining chemical substance resistance and preventing pickup of the fluorine-containing ether compound, particularly when the thickness of the lubricating layer is reduced.
Innovation Solution
A fluorine-containing ether compound with two or three perfluoropolyether chains, featuring a specific divalent linking group with tetrasubstituted carbon atoms and primary hydroxy groups, is used to form a lubricating layer that enhances adhesion to the protective layer, reducing thickness and suppressing pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricating layer is reduced, then the floating height of the magnetic head can be reduced, but the chemical substance resistance of the magnetic recording medium deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricant by using fluorine-containing ether compounds with specific molecular structures (including primary hydroxy groups and perfluoropolyether chains). This allows the lubricating layer to maintain chemical substance resistance even at reduced thickness, enabling lower floating height without sacrificing protection.
Solution Approach 2:
The invention uses composite molecular structures combining fluorine-containing ether chains with hydroxy groups and perfluoropolyether segments. This composite approach creates a lubricant that provides both adhesion to the protective layer and chemical resistance, allowing thin film formation while maintaining durability.
2Length of moving object
If the thickness of the lubricating layer is reduced, then the floating height of the magnetic head can be reduced, but pickup of the fluorine-containing ether compound occurs
Solution Approach 1:
The invention modifies the molecular parameters of the fluorine-containing ether compound by introducing specific functional groups (primary hydroxy groups) and structural elements (perfluoropolyether chains). These parameter changes reduce the compound's affinity for the magnetic head, preventing pickup while allowing thin film formation for reduced floating height.
Solution Approach 2:
The invention creates local quality differentiation within the lubricant molecule by having specific regions (hydroxy groups) provide adhesion to the protective layer while other regions (perfluoropolyether chains) provide non-stick properties. This local differentiation prevents pickup at the magnetic head interface while maintaining layer adhesion.
3Ease of manufacture
If conventional fluorine-containing ether compounds are used, then the lubricating layer can be formed, but the chemical substance resistance is insufficient
Solution Approach 1:
The invention employs composite molecular structures combining multiple functional elements: fluorine-containing ether chains for lubricity, hydroxy groups for adhesion to the protective layer, and perfluoropolyether segments for chemical resistance. This composite approach ensures both ease of layer formation and superior chemical substance resistance.
Solution Approach 2:
The invention optimizes the molecular parameters of the fluorine-containing ether compound by controlling the ratio and arrangement of different functional groups. Specifically, it uses compounds with primary hydroxy groups and perfluoropolyether chains in specific configurations to enhance chemical substance resistance while maintaining manufacturability.
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 chemical substance resistance and high pickup suppression, enabling reduced floating height and enhanced durability of the magnetic recording medium.
Implementation Method 1
a lubricant is applied to the surface of the protective layer to form a lubricating layer... the lubricating layer improves the durability and protective power of the protective layer
Implementation Method 2
the lubricating layer improves the durability and protective power of the protective layer and prevents the infiltration of a contaminant into the magnetic recording medium
Implementation Method 3
a lubricant containing a compound having a polar group such as a hydroxy group at a terminal of a fluorine-based polymer having a repeating structure including —CF2— has been proposed
Data Source
AI summary
This fluorine-containing ether compound is a fluorine-containing ether compound represented by the following formula:R1—CH2—R2—(CH2—OCH2—CR3R4—CH2O—CH2—R2)z—CH2—R5 (z represents 1 or 2. R2 is a perfluoropolyether chain. R1 and R5 are terminal groups having 1 to 50 carbon atoms and having at least one polar group. R3 and R4 may be the same as or different from each other, and are organic groups which do not include a secondary hydroxy group and a tertiary hydroxy group, include one primary hydroxy group, and have 1 to 5 carbon atoms bonded to a tetrasubstituted carbon atom. The organic group may include an ether oxygen atom between the carbon atoms, and a bonding terminal to the tetrasubstituted carbon atom may be an ether oxygen atom.)