JPS6161232A - Production of wear resistant magnetic recording medium - Google Patents

Abstract

PURPOSE:To deposit a high-polymer resin having a uniform thickness and high wear resistance on the magnetic film surface of a magnetic recording medium by evaporating directly or indirectly a two-pack type curable resin and hardener respectively from separate evaporating sources in a vacuum onto said magnetic film surface and curing the resin film deposited by evaporation. CONSTITUTION:The two-pack type curable resin is a monomer or oligomer of an epoxy resin, etc. and is the resin which can be polymerized by the hardener. Diethylene triamine, thiocol, etc. are used for the hardener in the case of, for example, the epoxy resin although the material varies with the kind of the resin. The production of the wear-resistant magnetic recording medium is executed by spanning, for example, a magnetic tape (a), which is constituted by forming a magnetic film consisting of Co-Ni-O on a non-magnetic tape substrate material, between an unwinding roll 4 and a take-up roll 5, via the peripheral surface of a rotary can 3 between said rolls, running the tape at a specified speed, evacuating the inside of a vacuum treating vessel 1, heating and evaporating respectively the resin 8 and hardener 9 from vessels 7 of heated evaporating sources under the reduced pressure in the vacuum and depositing the vapor thereof on the thin magnetic film surface of the traveling magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a wear-resistant magnetic recording medium that can be applied to magnetic tapes, magnetic disks, and the like.

(Prior art) In recent years, magnetic recording materials in which a magnetic film made of magnetic metal or magnetic oxide is formed on a non-magnetic substrate have been actively polished because they enable high-density recording, and some have not even been put into practical use. There is. The main ones are do-Ni plated disks, rFel 01 disks, 0o-Or disks or tapes, 0o-Ni vapor deposited tapes, BaO.F@103 disks, etc. These magnetic films are coated on non-magnetic substrates such as Al1% glass, ceramics, plastic films, etc.
Since it is formed as an extremely thin film of oX, when it slides on the head during recording or reproduction, the magnetic film wears out due to severe friction, making it unusable for a long time.

In order to improve this wear resistance, various methods have been tried in the past. One method is to form a film of polymer resin on the surface of the magnetic film, but there are two methods. Another method of coating and drying is to form a deposited film of a polymer resin on the surface of the magnetic film by sputtering or vacuum deposition. In the former method, it is difficult to create a coating film of 1000A or less, preferably 300A or less. The latter method has the disadvantage that if the polymer resin is sputtered or heated and evaporated, the polymerized molecules will decompose, making it impossible to obtain a high-quality wear-resistant protective film.

(Problems to be Solved by the Invention) The present invention solves the drawbacks of the above-mentioned conventional methods, and provides a method for manufacturing a wear-resistant magnetic recording material having a high wear-resistant polymer resin coating with a uniform thickness. It provides:

(Means for Solving the Problems) A method for manufacturing a wear-resistant magnetic recording body to solve the above-mentioned problems of the present invention is to directly or indirectly, on the magnetic side of the magnetic recording body, The method is characterized in that the two-component curable resin and the curing agent are evaporated from separate evaporation sources, and then the resin deposited film is cured.

(Example) Examples of the present invention will now be described.

The two-component curable resin used in the present invention includes epoxy resin,
Polymers such as polyurethane resins are oligomers that can be polymerized with a curing agent. The curing may be done by heat curing or room temperature curing. For items such as magnetic tapes that do not require heat treatment, use room temperature curable fat-saving material.

The curing agent varies depending on the type of resin, but for example, in the case of epoxy resin, diethylenetriamine, triethylene, triamine, polyamide, thiocol, etc. are used.

Next, the present invention will be explained in detail using the apparatus shown in the drawings. In the drawing (11 indicates a vacuum processing container connected to a vacuum pump through an exhaust port (2), and in the center of the container there is a cylindrical rotating can (3) and a pair of unwinding rollers (4) above and on the left and right. ) and the wind-up roller (5), and the anti-adhesion plates (6) are arranged on the left and right sides of the lower end of its rotating can (3), and directly below it, two heating evaporation source containers (such as electric heating type) are placed. One container (7) is filled with a monomer (8) such as a two-component curable resin such as epoxy resin, and the other container (7) is filled with a curing agent such as polyamide. Fill and prepare (9).These heating evaporation source containers (7
) and (7), a thermocouple is installed at the evaporation source (not shown), so that the temperature can be controlled so as to obtain a predetermined evaporation rate. A heating device α [of an appropriate length is provided along the circumferential surface of the magnetic tape a, which is located downstream of the magnetic tape a running on the outer circumferential surface of the rotary can fil. The heating device α1 is arbitrary, such as an electric heating device, a lamp device, or a high-frequency heating device c.

In order to manufacture the wear-resistant magnetic recording body of the present invention, for example, magnetic tape a1, for example, co-Ni-
A magnetic tape a on which a magnetic film of 0.00000000000000000000000000000000000 magnetic film is formed is passed between the unwinding roll (4) and the winding up roll (5) via the circumferential surface of the rotating can (3) in between. On the one hand, the vacuum processing vessel (
1) After evacuating the interior, under a constant vacuum and reduced pressure, the resin (8) and curing agent (9) are heated and evaporated from the heated evaporation source containers +71 and +71, respectively, and then applied to the thin magnetic film surface of the running magnetic tape. Vapor-deposited on. If it is cured at room temperature, leave it as it is＼
, a take-up roll (51) can be wound up, but if desired to accelerate curing or require heat curing, heat the vapor-deposited surface of the resin with heating device α1 to accelerate curing or heat curing. After doing this, roll it up (
5) A wear-resistant magnetic recording tape coated with a high molecular weight polymer coating is obtained. The rotating can can also be heated to accelerate curing.

Furthermore, as a second invention of the present application, there is provided a method for manufacturing a magnetic recording body to which a lubricant has been applied and further improved wear resistance as the wear-resistant magnetic recording body of the present invention, which comprises: The method is characterized in that a two-component curable resin is evaporated in vacuum directly or indirectly onto the magnetic film, and lubricant vapor is deposited in the process of curing the resin deposited film.

Typical examples of this lubricant include higher fatty acids and gold Jl! ! Use organic lubricants such as salts, derivatives such as amides, fluorocarboxylic acids, their salts, hydrocarbon paraffins, and halogenated carbons.

In order to carry out this second invention, in the apparatus shown in 1ift, an additional evaporation source container (7) is provided downstream of the container (sword (7)), and a lubricant (Ill) is filled therein. In addition to vapor deposition of the resin using the device, the lubricant a′
When IJ is heated and evaporated, and during the curing process of the resin, 0υ of lubricant vapor is mixed in, and furthermore, it is attached to the surface and cured as a mixed vapor deposition surface in this state,
A magnetic tape with improved wear resistance and lubricity can be obtained.

In this case, is the moisture mixed in the resin? 1? As the resin hardens, the resin acts as a binder for the lubricant, thereby firmly holding and binding the lubricant, so it maintains good lubrication over a long period of time and prevents what is called ``oil depletion.'' Good prevention.

Furthermore, when the lubricant is present on the surface of the cured resin vapor deposited film,
In the roll-shaped magnetic tape wound up on the take-up roll (5), the resin vapor deposited film is prevented from adhering to the surface of the tape base material where the two faces are polymerized.

Of course, if the back side of the base material is subjected to f1 release treatment, there is no risk of adhesion. In addition, the curing of the resin is performed using a winding roll (5
) If the resin film is not completed by the time it is rolled up, it can be taken out into the atmosphere and cured at a temperature around room temperature for several days. In this case, it is preferable to have a lubricant m on the surface of the resin film.

Although the above embodiment shows the case where the cured resin film of the present invention is directly formed on the magnetic film surface, it may be formed indirectly on the magnetic film surface via an oxide film or other protective film formed in advance. I can do it.

Next, more detailed examples will be described.

Example 1 As a magnetic recording medium to be processed, a magnetic tape was used in which a 1500λ thick 0o-Ni-0 magnetic film was formed on a 12μ square thick polyester film tape by oblique vapor deposition. The magnetic tape is mounted in the illustrated apparatus and run in close contact with a rotating can at a constant speed of 1 gate/min, while the inside of the vacuum processing container is evacuated and depressurized to a degree of vacuum of 2 x 10 Torr. As a liquid type curable resin, an epoxy resin oligomer and a polyamide curing agent are heated and evaporated at a constant evaporation rate.

Evaporation temperature is 1N130~160°C, 160~2
It was 00'C.

Next, the resin vapor-deposited film surface deposited on the magnetic film surface of the running tape is cured by heating at 100° C. for 30 seconds using a heating device, and then wound onto a take-up roll.

This rolled magnetic tape was heated at 50°C in the atmosphere for 1 hour.
Abrasion-resistant magnetic tape (crystal 1) in which a polymer cured film formed by curing these resins is coated and bonded to the top surface of the transparent film by heating for a week.
get. Separately, under the same conditions as above, except that stearic acid amide f was used as a lubricant and heated and vapor-deposited at a temperature of 120 to 150°C, the cured resin film was coated on the surface of the plate as a thin layer of 20 OA. Abrasive magnetic tape (crystal 2
) was obtained. Further, a wear-resistant tape (Crystal 3) of the present invention was obtained by changing the amount of epoxy oligomer and curing agent deposited.

For each magnetic tape of the present invention produced in this way, a VTR
The still playback life of the tape was measured. For comparison, we prepared a magnetic tape with no surface treatment at all (Comparative Example 1), a wear-resistant magnetic tape with only the above lubricant deposited on it (Comparative Example 2), and a magnetic tape with a polymeric epoxy resin that was heated and evaporated. A wear-resistant magnetic tape on which a vapor deposited film was formed was prepared (Comparative Example 5), and these were also measured in the same manner. The result is
It was as shown in Table 1 below.

Table 1 Crystal 1100 parts 50 parts +5OA -28 minutes Product 2 Too150s 150λ200 120
5 5 (ls 2 (1 * 70λ20
0 120 rotation comparative example 1 - - - -
α5 Comparative Example 2---20020 Comparative Example 311 "Atotoge 150A-5 Resin As is clear from Table 1 above, the still playback life of the wear-resistant magnetic tape according to the present invention can be increased compared to the comparative example. Admitted.

(Effects of the Invention) According to the present invention, the two-component curing resin is vacuum-deposited on the surface of the magnetic recording medium and the deposited film is cured to form a hardened film. A large magnetic recording body can be obtained, and furthermore, in this case, since a lubricant is vacuum-deposited during curing of the vapor-deposited resin, a magnetic recording body with improved wear resistance and oil run-out prevention properties can be obtained. It has the effect of being able to.

[Brief explanation of the drawing]

The drawing shows a cut side M view of an example of an apparatus for carrying out the method of the present invention. fi+...Vacuum processing container (3)...Rotating can (4)...Take-out roll (5)...Take-up roll (7)...Heating evaporation source container (8)...z Wave-shaped curable resin (9)...Curing agent αl...Heating device a...Lubricant

Claims (1)

[Claims] 1. A two-component curable resin and a curing agent are evaporated from separate evaporation sources directly or indirectly on the magnetic film surface of a magnetic recording material in a vacuum, and then the resin evaporated film is formed. A method for producing a wear-resistant magnetic recording material, characterized by hardening the material. 2 A durable method characterized by evaporating a two-component curable resin directly or indirectly onto the magnetic film of a magnetic recording material in a vacuum, and depositing lubricant vapor in the process of curing the resin evaporated film. Method for manufacturing abradable magnetic recording material.