JPH0419816A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To improve a traveling property and corrosion resistance by incorporating a fluorine compd. having a triazine thiol ring into a magnetic layer formed on a nonmagnetic substrate. CONSTITUTION:This recording medium is formed by incorporating the lubricant contg. the fluorine compd. having the triazine thiol ring in the molecule into or onto a magnetic layer. The fluorine compd. having the triazine thiol ring in the molecule to be used is exemplified by the compd. expressed by formula I. The reason why this compd. is preferable as the lubricant lies in that the thiol group thereon bonds by reacting with the metal of the magnetic layer and securely adsorbs the fluorine compd. to the magnetic layer. The excellent lubricating function and water- and oil-repelling functions are prevented from being lost in spite of the sliding contact with the magnetic layer of a magnetic head. The traveling property and corrosion resistance are thus maintained over a long period of time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording medium, and more particularly, the present invention relates to a magnetic recording medium.
This invention relates to improving the lubricity of the rubber layer.

[Conventional technology]

Bind the magnetic powder together with the binder component onto the substrate film or! ! In magnetic recording media made by depositing Ii magnetic pouring metal or their alloys on a base film by vacuum deposition, etc., the B-type NII is worn out due to violent sliding contact with a mountain head, etc. during recording and reproduction. It's easy.

In particular, ferromagnetic metal thin R-type magnetic recording media formed by vacuum deposition etc. have excellent high-density recording characteristics, but on the other hand, they have a large coefficient of friction with the magnetic head and are easily susceptible to wear and tear, and are also susceptible to oxidation in the air. There is a problem with deterioration of magnetic special orders such as the 7" L Max.

To prevent magnetic deterioration due to MI wear due to sliding contact with magnetic heads, oxidation of two-metal magnetic materials, etc.

Perfluoroalkyl polyether and hydroxyl groups.

A coating of fluorine-based lubricant such as perfluoroalkyl polyether containing a carboxyl group is provided to improve runnability and corrosion resistance. Efforts are being made to improve E. C1f
#Kaisho 56-124127).

However, such fluorine-based lubricants have weak interaction with the surface of the magnetic layer, and when they come in sliding contact with the magnetic head, they separate from the surface force of the WE layer, resulting in insufficient runnability and corrosion resistance. have not been able to improve.

[Points of review trying to invent or solve]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of separation of the 1111-protective layer from the magnetic layer, and thereby provide a magnetic recording medium with excellent running properties and corrosion resistance.

[Means to solve the problem]

As a result of various studies to solve the above problems, Hi
By leaving a lubricant containing a fluorine compound having a triazinethiol ring in one molecule in the magnetic layer or on the basic layer, the runnability and corrosion resistance of the 8-gas recording medium can be sufficiently improved. Ta.

Examples of the fluorine compound having a triazinethiol ring in the molecule used in this invention include those represented by the general formula %.

Although this compound is preferred as a lubricant, the thiol groups within it react and bond with the metal of the Mi layer.

It is presumed that this is because the fluorine compound @t- provides a strong adhesion to the magnetic layer. Therefore, the excellent lubricating function and water-repelling function are not lost even when the iB magnetic layer comes into sliding contact with the magnetic head, and running properties and corrosion resistance are maintained over a long period of time.

Such a fluorine compound having at least three or more triazinethiol rings in its molecule is dissolved in a suitable solvent such as Freon, and the magnetic layer is immersed in this bath solution, or the solution is soaked in the solution for 60 minutes. 1 on the surface of the injection layer! ! It is applied to the magnetic layer using a method such as cloth or spraying.

The coating amount is within the range of 0.5 to 1O2/- to the surface of the m-type layer. If it is too small, the desired effect will not be obtained, and if it is too large, it will cause a dropout in the output.

〔Example〕

Next, embodiments of this invention will be described.

Example 1 A polyester film with a thickness of 10 μm was loaded directly into the vacuum evaporation folds, and a cobalt film with a thickness of 02 μm was formed by thermal evaporation of a cobalt nickel alloy (t-HD) under the vacuum of a 5 - forming a thin film layer of nickel, then applying this method.
0. of H*Ca\N-C4HI.
l After soaking in wt% Freon solution and using IE, it took 8 hours! l! The magnetic tape was then vibrated. At this time, Hun^ compound (7) having a triazinethiol ring! ! !
! il-! 3.211f? /e/T6->7j.

Example 2 α-F@jelly powder 80 parts by weight Vinyl chloride-vinyl acetate-vinyl alcohol copolymer (UCC
manufactured by VAGH) 12 weight polyurethane resin (Japan Polyurethane Co., Ltd. 111.N-2304)
Quadruple part trifunctional low molecular violet isocyanate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronate L
) 2 parts by weight 7 Kurohekusanon 80
11 Dobe toluene 801 Dobe methyl ethyl ketone 80 weight tm The above composition @ was mixed and dispersed in a ball mill for 72 hours to make a Mi coating material, and this magnetic coating material was placed on a 10 μ thick polyester film with the thickness after drying. vcI so that it becomes 3μsK
The It1 cloth was dried to form a magnetic layer. Next lol Nl?
Immersion in a 0.1 wt% Freon solution of a fluorine compound having a triazinethiol ring in the same manner as in 111, and drying 9
I cut it to Ik8 width and made magnetic tape. The snow adhesion ri of the lubricant was 4.0Q/,/.

Meibendo 3 Example iK'J? α-F as magnetic powder in magnetic paint
- A magnetic tape was produced in the same manner as in Example fi12, except that Co-containing -Fe*Os was used instead of powder.

The amount of lubricant applied was 2.5-/I.

Comparative Example 1 In practice, the lubricant was replaced with a Freon solution of a fluorine compound containing a triazinethiol ring.

0 of hydroxyl group-containing barfluoroalkyl polyether (Anymond's RFomb in -Z -DOL)
．． In addition to using l wt% Freon solution, the implementation f'
A magnetic tape was produced in the same manner as in 1ll. Snow adhesion of lubricant is 2.511/11/fp.

Comparative Example 2 In Example 2 (Q), instead of the Freon bath solution of the triazinethiol ring-containing fluorine compound, water l!! group-containing perfluoroalkyl polyether (manufactured by Anymond Co., Ltd., Fo
A magnetic tape was produced in the same manner as in Example ft12, except that a 0.1 wt % 7 Leon solution of mblin -Z -DOL was used. 2.2 ■/- for lubricant adhesion 1
Met.

Comparison? 113 In Example 3, 2, in place of the Freon solution of the triazinethiol ring-containing fluorine compound, a hydroxyl group-containing barfluoroalkyl polyether (manufactured by Anymond Co., Ltd., Fo
A magnetic tape was produced in the same manner as in Example 3, except that a 0.1 wt% Freon bath solution (mblin-Z-DOL) was used. I fell in love with lubricant at 1.5111i'/7.

Comparative Example 4 In Example 1, perfluoroalkyl polyether (manufactured by Anymond Co., Ltd.) was used instead of the Freon bath solution of the triazinethiol ring-containing fluorine compound.

Fombl 1n-Z 25 ) of 0. A magnetic tape was produced in the same manner as in Example 1, except that the lvt% Freon bath solution was used from January to February. f! 4 Lubricant coating amount ri1.
It was lll/-.

Comparative Example 5 In Example f12, Freon, a fluorine compound containing a 1-reazine-naol ring, was used. [C[Also, perfluoroalkyl polyether (Fomblin-Z25) OO,
A magnetic tape was prepared in the same manner as in Example 2 except that a 1 wt% Freon bath solution was used. The snow adhesion of the lubricant was 0.7/-.

Hi! Example 6 In Example 3, perfluoroalkyl polyether (Fomblin-Z25) OO, 1w was used instead of the Freon solution of the triazinethiol ring-containing fluorine compound.
A magnetic tape was produced in the same manner as in Example 3 except that t% Freon bath solution 1-2 was used. The snow adhesion of the lubricant was 0.5/I.

Regarding Tokutomo Foundation Tape in each of the above actual mkas and comparative examples,
The friction coefficient, jitter characteristics, durability, and good resistance of the seven samples were determined.

j11 friction coefficient is 1 surface roughness U, 2, , outer diameter 4n cylindrical bottle [fB magnetic tape wound at a winding angle of 150 degrees, load l!
Apply 21g, feed at a feed rate of 1, 4cal sec,
Measure the PI current t-shield and find the value for the 100th pass. A 1mri, A-air tape was loaded into the video deck, the video signal was recorded and played back, and the interval between the 15.75 KHz horizontal synchronization signals of the playback signal was read.

At that time, the 1-second horizontal synchronization signal interval was measured. This is an index of nr1 running performance.

Durability test was carried out under the conditions of 25°C and 60% RH.
I ran it on see and played it, and the output was 3dB better than Hatsuda Riki.
The test was carried out by keeping the number of runs in the decreasing case constant at 111 times.

The corrosion resistance test was carried out by leaving the 8K tape under the conditions of 60° C. and 90% RH, and controlling the maximum magnetic flux density. Note that the measured values are shown as values compared with n, with the maximum magnetic flux density of radiation tta as 100%.

[9yJ of the invention] As explained above, by using a fluorine compound @ having a triazinethiol ring in the molecule as a lubricant for a mountain recording medium, it is possible to improve runnability and durability, and also improve its performance. There are a lot of times! It is clear that a magnetic recording medium with excellent durability that lasts for a long period of time can be obtained.

Claims (2)

[Claims] (1) A magnetic recording medium characterized in that a magnetic layer is formed on a nonmagnetic substrate, and a fluorine compound having a triazinethiol ring is contained in the magnetic layer. (2) A magnetic recording medium characterized in that a magnetic layer is formed on a nonmagnetic substrate, and a fluorine compound coating film having a triazinethiol ring is provided on the magnetic layer.