Perfluoropolyether Lubricant for Magnetic Disk Heat Resistance
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Solution Overview
Problem
Conventional lubricants for magnetic disks with lowered molecular weight tend to volatilize easily, leading to abrasion and impurity adhesion when the disk and head contact, and lack excellent heat resistance and solubility in fluorine-based solvents.
Innovation Solution
A perfluoropolyether compound with five or six hydroxyl groups at both terminals, specifically structured to provide excellent heat resistance and solubility in fluorine-based solvents, is used as a lubricant, formulated to minimize volatility and maintain a stable lubricant layer even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If lubricant molecular weight is lowered to make the lubricant layer thinner, then the lubricant layer thickness is reduced, but the lubricant volatility increases causing abrasion and impurity adhesion
Solution Approach 1:
The invention changes the molecular weight parameter of the lubricant to a specific range (500-4000) to simultaneously achieve thin film formation and prevent volatility. This parameter optimization resolves the contradiction between thin lubricant layer requirement and volatility prevention.
Solution Approach 2:
The invention uses perfluoropolyether compounds with specific structural characteristics (combining fluorinated polymer chains with terminal hydroxyl groups) to create a lubricant that exhibits both low volatility and good solubility. The composite molecular structure enables simultaneous achievement of thin film stability and low volatility.
2Length of moving object
If lubricant molecular weight is lowered to form thinner films, then the lubricant layer can be made thinner, but the lubricant heat resistance deteriorates
Solution Approach 1:
The invention optimizes the molecular weight parameter to the range of 500-4000, which is sufficient to provide thermal stability while allowing thin film formation. This parameter selection resolves the contradiction between thin film requirement and heat resistance.
Solution Approach 2:
The perfluoropolyether structure combines fluorinated carbon chains (providing thermal stability) with terminal hydroxyl groups (providing solubility and film-forming capability). This composite molecular structure enables thin film formation without sacrificing heat resistance.
3Ease of manufacture
If conventional perfluoropolyether compounds are used, then the lubricant can be applied, but the solubility in fluorine-based solvents is insufficient
Solution Approach 1:
The invention introduces hydroxyl groups at the terminal positions of the perfluoropolyether chains. This local modification at the molecular ends provides polarity and hydrogen bonding capability, significantly enhancing solubility in fluorine-based solvents while maintaining the bulk fluorinated structure's stability.
Solution Approach 2:
The invention creates a composite molecular structure combining non-polar fluorinated carbon chains (for stability and low volatility) with polar terminal hydroxyl groups (for solubility). This composite structure resolves the contradiction between applicability and solubility.
Data Source
AI summary
Provided are a magnetic disk and, in particular, a compound which makes it possible to realize a lubricant having excellent heat resistance and solubility in a fluorine-based solvent. A perfluoropolyether compound in accordance with an aspect of the present invention has, in hydrocarbon groups at both terminals thereof, five or six hydroxyl groups in total.