Perfluoropolyether Lubricant with Naphthyl Groups for Magnetic Disk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lubricant layers for magnetic disks are inadequate in preventing siloxane adhesion to carbon protective films, especially when the lubricant layer is thin, which can lead to reduced head flotation and data storage issues.
Innovation Solution
A perfluoropolyether compound with polycyclic aromatic substituents such as naphthyl or phenoxyphenyl groups is developed, providing enhanced adsorbability and siloxane resistance, forming a film that effectively covers the magnetic disk surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lubricant layer is made thinner to increase recording density, then the recording density is improved, but the covering property deteriorates and siloxane adhesion increases
Solution Approach 1:
The invention changes the chemical structure parameters of the lubricant compound by introducing polycyclic aromatic substituents (naphthyl or phenoxyphenyl groups) at specific positions in the perfluoropolyether molecule. This structural modification enhances the lubricant's adsorbability and covering property, allowing thin film formation while maintaining effective coverage of the carbon protective film and preventing siloxane adhesion.
2Productivity
If the lubricant layer is made thinner, then the recording density is improved, but siloxane resistance deteriorates
Solution Approach 1:
The invention modifies the molecular structure of the lubricant by incorporating polycyclic aromatic groups (naphthyl or phenoxyphenyl) into the perfluoropolyether backbone. These structural changes enhance the lubricant's ability to form dense, adherent films that effectively block siloxane adhesion even at reduced film thicknesses, thereby maintaining siloxane resistance while enabling higher recording densities.
3Ease of manufacture
If conventional lubricant compounds are used, then the manufacturing process is simple, but adsorbability and covering property are insufficient
Solution Approach 1:
The invention creates a composite molecular structure by combining perfluoropolyether backbone with polycyclic aromatic substituents (naphthyl or phenoxyphenyl groups). This composite structure integrates the beneficial properties of both components: the perfluoropolyether provides film-forming capability and chemical stability, while the polycyclic aromatic groups enhance adsorbability and covering property through pi-pi interactions with the carbon protective film.
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 high adsorbability and siloxane resistance, reducing impurity adhesion to the carbon protective film, thereby improving the performance and reliability of magnetic disk storage.
Implementation Method 1
a compound having a polycyclic aromatic substituent such as a naphthyl group or a phenoxyphenyl group has excellent adsorbability
Implementation Method 2
exhibits favorable siloxane resistance, thereby completing the present invention... having high adsorbability and a high covering property with respect to a magnetic disk, particularly a carbon protective film
Data Source
AI summary
Provided is a compound which allows realization of a lubricant having high adsorbability and a high covering property with respect to a magnetic disk, particularly a carbon protective film. A perfluoropolyether compound in accordance with an aspect of the present invention has a naphthyl group or a phenoxyphenyl group at any one of terminals thereof.