Fluoropolyether Lubricant with Aromatic Rings for Magnetic Disk Film Stability
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Solution Overview
Problem
Fluoropolyether lubricants used in magnetic disks are prone to decomposition when contacted with Lewis acids, leading to a reduction in molecular weight and film thickness, which compromises their durability and ability to maintain a stable lubricant film, especially under high recording densities.
Innovation Solution
A fluoropolyether compound with an aromatic group and hydroxyl functionalization is developed, which is synthesized by reacting a straight-chain fluoropolyether with a phenoxy compound containing epoxy or haloethyl groups, enhancing its durability and adhesion to the carbon protective film, thereby reducing the spacing between the magnetic head and disk while maintaining a stable lubricant film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolyether lubricants are used in magnetic disks, then lubrication is provided, but decomposition occurs when contacted with Lewis acids (Al2O3), reducing molecular weight and film thickness
Solution Approach 1:
The invention uses a composite molecular structure combining perfluoropolyether main chain with aromatic ring and hydroxyl group segments. The aromatic ring provides structural rigidity and chemical stability against Lewis acid decomposition, while the perfluoropolyether portion maintains lubrication properties. This composite structure resolves the contradiction by integrating materials with complementary properties into a single functional molecule.
Solution Approach 2:
The lubricant molecule exhibits local quality differentiation: the aromatic ring portion provides chemical stability and adsorption capability to the carbon protective film, while the perfluoropolyether chain provides lubrication function. The hydroxyl group specifically interacts with the carbon protective film through hydrogen bonding. This localized functional differentiation allows the single molecule to simultaneously achieve chemical stability and lubrication performance.
2Productivity
If mono-layer thickness of lubricant is reduced to diminish spacing between head and disk, then recording density is improved, but film stability and durability are compromised
Solution Approach 1:
The invention changes the molecular parameters of the lubricant by introducing aromatic rings and hydroxyl groups into the perfluoropolyether structure. This modification alters the adsorption characteristics and intermolecular forces, enabling the formation of ultra-thin mono-layers with enhanced stability. The aromatic ring's planar structure and hydroxyl group's hydrogen bonding capability allow for tighter packing and stronger adhesion to the carbon protective film, maintaining film stability even at reduced thickness for high recording density applications.
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 compound achieves improved durability and reduced mono-layer thickness, ensuring effective lubrication and film stability even under high contact or sliding conditions, with enhanced resistance to decomposition when exposed to Al2O3 components.
Implementation Method 1
Fomblin ZTETRAOL exhibits good adsorption to the disk due to the presence of hydroxyl positioned at the opposite terminals of the molecule
Data Source
AI summary
A compound of the formula (1), lubricant containing the compound and magnetic diskC6H4—(O—Z—R—X)2 (1)wherein Z is —CH2CH2O— or —CH2CH(OH)CH2O—, R is —CH2CF2CF2CF2O(CF2CF2CF2CF2O)nCF2CF2CF2CH2—, n is a real number of 0 to 20, X is —OH, —O(CH2)mOH, —OCH2CH(OH)CH2OH, —OCH2CH(OH)CH2O—C6H5 or —OCH2CH(OH)CH2O—C6H4—OCH3, m is an integer of 1 to 6.