Aromatic Polyamide Magnetic Recording Medium Moisture Control
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Solution Overview
Problem
Magnetic recording media with aromatic polyamide supports experience deterioration in electromagnetic conversion characteristics when exposed to temperature and humidity changes, leading to increased friction and data storage issues.
Innovation Solution
A magnetic recording medium with a non-magnetic support made of aromatic polyamide and a magnetic layer containing ferromagnetic powder, where the spacing difference measured after methyl-ethyl-ketone cleaning is within 0 to 15.0 nm, and the support has a moisture absorption of 2.2% or less, to minimize moisture adhesion and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the control conditions of temperature and humidity are relaxed to save power, then energy consumption is reduced, but electromagnetic conversion characteristics deteriorate due to environmental changes
Solution Approach 1:
The magnetic recording medium is pre-treated with a fluorinated compound to create a moisture-resistant surface layer before exposure to environmental changes. This preliminary action prevents moisture adhesion that would otherwise occur during temperature and humidity fluctuations, thereby maintaining electromagnetic conversion characteristics without requiring strict environmental control
Solution Approach 2:
A fluorinated compound acts as an intermediary substance between the magnetic layer and the environment. This compound forms a protective interface that repels moisture and prevents direct interaction between environmental humidity and the magnetic recording surface, thus preserving electromagnetic properties under relaxed temperature and humidity conditions
2Loss of energy
If the magnetic recording medium is exposed to high temperature and high humidity environment, then power savings are achieved by relaxed control, but moisture adhesion increases causing friction and performance deterioration
Solution Approach 1:
The fluorinated compound treatment converts the harmful effect of high humidity into a beneficial outcome by creating a surface that actively repels moisture. Instead of moisture adhering to the magnetic layer and causing friction, the fluorinated surface causes moisture to be repelled, thereby transforming the high humidity environment from harmful to neutral or beneficial for maintaining low friction
Solution Approach 2:
The surface energy parameters of the magnetic recording medium are changed by applying a fluorinated compound. This chemical modification alters the surface properties to be hydrophobic and oleophobic, changing how the surface interacts with moisture and reducing adhesion forces even in high temperature and high humidity environments
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 solution effectively suppresses the deterioration of electromagnetic conversion characteristics under high temperature and high humidity conditions, maintaining data storage integrity by reducing moisture adhesion and friction.
Implementation Method 1
the non-magnetic support is an aromatic polyamide support having a moisture absorption of 2.2% or less
Implementation Method 2
a difference (Safter−Sbefore) between a spacing Safter measured on a surface of the magnetic layer by optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by optical interferometry before methyl-ethyl-ketone cleaning
Implementation Method 3
a spacing Safter measured on a surface of the magnetic layer by optical interferometry
Data Source
AI summary
The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference Safter−Sbefore between a spacing Safter measured on a surface of the magnetic layer by optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by optical interferometry before methyl-ethyl-ketone cleaning is more than 0 nm and 15.0 nm or less, and the non-magnetic support is an aromatic polyamide support having a moisture absorption of 2.2% or less.