SU1247928A1 - Composition of working layer of magnetic record medium - Google Patents

Abstract

The invention relates to the field of magnetic recording and allows to increase the physicomechanical and electromagnetic parameters. For this purpose, the working carrier layer contains polyphenylethoxysiloxane as the organosilicon compound in the following ratio of components, wt%: chelas oxide ferromagnetic powder 18.70-24.0; non-magnetic alumina 0,27-0,36; epoxy resin 13.9-16.2; phenol formaldehyde resin 6.0-8.0; polyfeiyltoxysilox - 0.9-1.9 ;. melamine resin-aldehyde resin 1.1-1.6 and solvents - the rest. Due to its mobility and penetration into the conglomerates of polyphenylethoxysiloxane ferro powder. wedges them and forms a mono-molecular layer that prevents further particles from sticking together and, interacting with the binder, promotes uniform distribution of the ferropowder in the magnetic material, which makes it possible to obtain a uniform coating. Table 2. s (l 1c o to cx

Description

The invention relates to magnetic recording and can be used to make a working layer of a magnetic recording carrier.

The aim of the invention is to increase the physicomechanical and electromagnetic parameters.

Magnetic material was prepared as follows.

Ferromagnetic powder Fe; jOiH, nonmagnetic alumina is dispersed with 3 solution of polyphenyltoxy siloxane, taken in an amount of 0.5-10.0 wt.% Of the weight of Fe.jO and dissolved in organic solvents: toluene or xylene for 1.5 -2.0 hours, then an epoxy resin solution is added and continued to disperse until a uniform magnetic material is obtained for / 40-50 hours. After obtaining a uniform material, phenol-formaldehyde and melamine-formaldehyde resins are added, followed by dispersion for 2-4 hours. Thus, common its dispersion time of the magnetic material is 44-56 hours.

to

The magnetic material consists of ferromagnetic powder IfFe, O, non-. alumina magnetic powder, high molecular weight zpoxy resin, phenol formaldehyde resin, and solvents, a polyphenylethoxy siloxane compound is introduced

 (oc, Hp; j,

ts

L2479282

. Where, 8-1,24 in the amount of 0.5-10 wt.% based on the weight of the powder FejOj (Т26-02-995-80, modifier 113/63).

The components are taken in the following relation, weight,%:

Ferromagnetism

powder) (- oxides

iron18,0-24,0

Non-magnetic oxide

aluminum 0,27-0,36

Polyphenylstoxysiloxane. . 0.9-1.9

High molecular epoxy

resin 13.9-16.2

Phenol formaldehyde resin6.0-8.0

Melamine formaldehyde resin. 1.1-1.6

Solvents Else

The chemical bonding of the powder-binder through the use of polyphenylztoxysiloxane made it possible to improve the durability of the coating, and this in turn led to a decrease in the adir when writing and reading information, since a non-wear-resistant coating can be transferred to the magnetic head during a short contact that will violate the float of the magnetic head (MG) above the surface of the coating with its subsequent bully. Wear resistance was determined through 35 abrasive wear resistance and JV (JV is an indirect indicator of the operational durability of the coating and is measured by the grinding time of an I micron coating).

The data are summarized on table 1.

t and b l and II a I

20

25

thirty

Abrasive wear resistance, microns

SP, remove 1 micron coating per, p.

Dynamic durability (MG shocks with information preservation)

500-550

Up to 4,000

From the data in the table it can be seen that dynamic wear resistance (simulated operating conditions during start-up and shutdown of the storage device) is also significantly better compared to the prototype.

Due to its mobility and penetration into the conglomerates of the ferropowder, polyphenylethoxysiloxane wedges the yus and forms a monomolecular layer around them, which prevents further sticking of the particles among themselves and, interacting with the bonding ability,%

800 track

Modulation,%

Adjustable

errors, pcs

From the data of Table 2 it can be seen that an improvement in the amplitude of the reproduced signal leads to an improvement in the resolution, which is the ratio of the amplitude measured at a frequency of 2f to the amplitude at a frequency of If. Obtaining a uniform coating made it possible to obtain a uniform amplitude along the track (i.e., circumferentially).

Claims (1)

Invention Formula The composition of the working layer of the magnetic recording medium, containing ferrostim, contributes to the uniform distribution of ferropowder in the magnetic material (ferrolac). Uniform distribution of ferropowder in magnetic material pos-. It is desirable to obtain a uniform coating with an improved amplitude, especially at the inner radius, since delamination of the magnetic material does not occur during the centrifugation process. Data on electromagnetic parameters are summarized in table 2, Table 2 80 94 + 95 125 60 magnetic powder Jf-iron oxide, non-magnetic alumina, epoxy resin, phenol-formaldehyde and melamine-formaldehyde resins, organosilicon compound and solvents, which, in order to improve the physicomechanical and electromagnetic parameters, the composition contains as silicon-organic polyphenylethoxysiloxane compounds in the following ratio, wt.%: Ferromagnetic iron oxide V OXII powder 18.70-24.0 5-1247928 Non-magnetic Polyphenylethoxy aluminum oxide 0.27-0.36 siloxane 0.9-1.9 Epoxy resin13,9-16,2MelaminoformalPhenoloformal-5 dehydrogen1,1-1,6 dehydric resin6.0-8.0 Solvents Else