SU994532A1 - Composition of working layer of magnetic record carrier - Google Patents

Description

The invention relates to magnetic recording, in particular to magnetic recording media used in computing, sound recording, television and telemetry, as well as for flexible magnetic recording media.

The known composition of the working layer of the carrier magnetic recording, containing a copolymer of vinyl chloride with vinyl acetate, polyurethane elastomer, epoxy resin, hardener 1.

The closest to the technical solution of the invention is the composition of the working layer of the magnetic recording medium containing magnetic iron oxide, partially saponified vinyl chloride copolymer with vinylacetate, polyurethane elastomer, epoxy resin with an epoxy content of b: -15% and mol. weighing 1000, hexamethoxymethylmelamine, dialkylpolyglycolic. ether of orthophosphoric acid, dodecylbenzenesulfonic acid, solvent 2.

However, the working layer on the basis of these compositions does not provide high physicomechanical properties, in particular, it has insufficient microhardness and adhesive-cohesive strength).

The purpose of the invention is to increase the MINS of the hardening and adhesion-cohesive strength of the working layers with a thickness of 2.0-3.0 microns.

The goal is achieved by the fact that the composition of the working layer of the carrier of magnetic recording, including magnetic inclusions - y-iron oxide, partially saponified copolymer of vinyl chloride with

to vinylacetate, epoxy resin with contained; 1m of epoxy groups 6-15% and mol. weighing 1000, dialkylpolyglycolic ester of phosphoric acid, the solvent additionally contains

45 nitrile-butadiene rubber with a content of 28-41% nitpilacrylic acid and phenylmethane diisocyanate or toluene diisocyanate or hexamethylenes-. diisocyanate in the following ratio of components, wt.%:

Magnetic -j-iron oxide20.0-30.0

Partially saponified

25 vinyl chloride copolymer with vinyl acetate-tom 1,5-5,0

Nitrile butadiene rubber with co30 holding 28-41%

 nitrilacrylate

acid i 4.8-7.5

Epoxy resin

Sch content of epoxy groups

6-15% and a molecular weight of 1000 0 / 3-2.0

Phenylmethane diisocyanate or toluene diisycyanate or

Heck with Ametili Go and Otsianat1, 0-4,5

Dialkylpolyglycolic orthophosphoric acid ester 0.4-0.6

Solvent, Rest. Cyclohexanone, methyl ethyl ketone, dichloroethane, butyl acetate, etc. are used as solvents.

The composition is prepared in a ball mill in two stages as follows.

In the 1st stage, the ball mill is sequentially loaded with a -magnetnu. if-OKHCb iron (brand PM-1 or type-12.), dialkyl polyglycol ether

Components

Prototype, g

orthophosphoric acid (oxyphos KD-bG the solvent is dispersed 24 hours

In the 2nd stage, the partially saponified copolymer is added to the resulting mass. vinyl chloride with Amarka A-15-Ohm vinyl acetate, nitrile-butadiene rubber (5% solution in cyclohexanone, epoxy resin and solvent. Dispersing is carried out to a volume concentration of 1.5-1.6 h / cm (approximately 48 h). The finished composition is filtered, the diisocyanate solution is added, mixed thoroughly and applied to a polyethylene terephthalate base on a glaze machine.

In tab. 1 is given the recipe of the magnetic carrier recording layer.

In tab. 2 shows the physico-mechanical properties of the working layers according to the invention and the prototype.

Thus, the working layer of the magnetic recording bodies is used with g-. Composition of the proposed invention has, in comparison with the known, increased microhardness and adhesion-cohesive strength.

Table Formulation formulations

Offered

Magnetic j-oKHCb iron

Partially saponified vinyl chloride copolymer (vinyl acetate

Polyurethane elastomer

Nitrile butadiene rubber with a content of 2841% nitrilacrylic acid

Epoxy resin with an epoxy content of 615% and a molecular weight of 1000

Hexamethoxymethylmelamine benyl methane diisocyanate Toluene diisocyanate Hexamethylene diisocyanate

25

20

thirty

1.5

3.75

7.5

1.4

0.3

1.0

2.5

4.5

Curing catalyst

Diacoly and polypolyhydroxy ether orthophosphoric acid

Solvents

Continued table. one

0.6

0.5 55.6 60.85

GO

PM

GM

Qi

a)

about

PM

l

to

about

e

SL

00

VJ3

go

m

I

about

n asn n

a t n o "o m and

00

About g

oh oh

about

N

(N (N

1C in

00

about

VO

with

VO

tT, PM

(N Gso

(N CN

g- "l

cm

CN

VO

about 1

OO

AND

in yj

O (N

about

About CN

VJ3

about

GM

go

S

soda

i

1h

wow

OU

Ho

Oi

wasp

S cm

i

(Ok s

O) F and

and I

axf

about X

LF

Claims (2)

Invention Formula ; The composition of the working layer is nbeitel. magnetic recording, eklyuyadiy iSai -nktkuyu-f-OKKCb ironf partially. saponified vinyl chloride copolymer with vinyl acetate, epoxy resin with an epoxy content of 6–15% and a molecular weight of 1000, dialkyl polyglycol orthophosphoric acid ester, a solvent, so that, with a target of microhardness improvement and an adhesion, microhardness and an adhesion, and with the fact that, with a microhardness and an adhesive, it is imperative, and with the fact that, with a microhardness and an adhesive, it is imperative, and with the fact that with a microhardness and an adhesive, it is imperative that with a microhardness and an adhesive, and with the fact that working layers with a thickness of 2.0-3.0 μm, 0 (1 additionally contains butadiene-nitrile rubber with a content of 28-41% nitrilacrylic acid and phenyl methane diisocyanate or toluene diisocyanate or hexamethylene diisocia: nat in the following ratio of components, in with%.:.  Magnetic. . | r-oxide iron Za20,0-30,0 Partially saponified-. . . copolymer vinyl chloride with vinyl acetate, 0 Nitrile butadiene rubber with a content of 28–41% nitrilacrylic acid 4.8–7.5 Epoxy resin with an epoxy content of 6–15%. and a molecular weight of 0.3-2.0, a weight of 1000. Phenylmethane diisocyanate or toluene diisocyanate or hexamethyne .: lendiisocyanate 1,0-4,5 Dialkylpolyglyco: left orthophosphoric ester acid 0.4-0.6. Solvent Remaining Sources of information that are considered in the examination1. USSR Author's Certificate bZZobb, cl. 11 B 57b8 1977. . 2. Copyright certificate CdCP 529478 cl. G 11 5/68, 1975 rototype).