SU1287224A1 - Magnetic suspension for working layer of magnetic record medium - Google Patents

Abstract

The invention relates to a magnetic recording technique and allows an increase in the service life of the carrier due to the increase in the wear resistance of its working layer. Magnetic suspension contains as a dispersant a mixture of triethanolammonium salts of mono- and dialkyl phosphates, and triisocyanate is used as hardeners. The plasticizer is the diethylene glycol ester and C-Cgd-branched fatty acid fractions, and the curing catalyst is acetylacetonate. The magnetic suspension is applied in the form of a film over an o-dream, forming a working carrier layer with high magnetic properties. , (L

Description

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The invention relates to magnetic recording, in particular to magnetic suspensions for working media of a magnetic recording medium. The purpose of the invention is to increase the service life of the magnetic recording medium by increasing the wear resistance of its working layer,

The magnetic suspension for the working layer of the magnetic recording carrier consists of particles of haim-iron oxide distributed in a mixture of a copolymer of vinyl chloride with vinyl acetate, a solution of polyurethane rubber, acetylene black, methyl ethyl ketone, dispersant, plasticizer, hardener, and catalyst. In this case, the solution of polyurethane rubber is a solution of polyurethane rubber in a mixture of methylethipketone and cyclohexanone.

Magnetic suspension contains as a dispersant a mixture of triethanol-ammonium salts of mono and dialkylphosphates, as a plasticizer diethylene glycol ether and C-SdY-branched salts of fatty acids as a hardener - triisocyanate; component

acetate, 1.85, a solution of polyurethane rubber 24.0, a mixture of triethanol-ammonium salts of mono- and dialkylphosphate 0.75, an ester of diethylene glycol and fractions of α-branched fatty acid salts 0.4945, acetyl-. new carbon black 0.9, triisocyanate 1.5, iron acetylacetonate 0.0055 and methyl ethyl ketone 45.0.

The magnetic suspension can, in addition, contain, by weight,% magnetic particles 25 (0., Vinyl chloride-vinyl acetate copolymer 1.55, polyurethane rubber solution 23.0, a mixture of tri-ethanol, 1-monium salts of mono- and dialkyl phosphates 1,2, diethylene glycol ester and fractions of Cp-C9 H-branched fatty acid salts of 0.644, acetylene carbon black 1.0, triisocyanate: 2.6, acetylacetonate 0.006, and methyl ethylene ketone 45.0.

The proposed magnetic suspension, deposited in the form of a film on a substrate, forms the working layer of the magnetic recording carrier, and has increased wear resistance. Such a magnetic recording medium has an increased service life, as well as high magnetic properties.

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Claims (1)

Invention Formula tone, wt,%: magnetic particles 24.5 - 25.5; vinyl chloride copolymer with vinyl acetate; 1.55-1.85; polyurethane rubber solution 21.0-24.0; a mixture of triethanol ammonium salts of mono - and dialklnosfaty 0.75-1.25; diethylene glycol ester and fractions of the "-branched. salts of fatty acids OJ465-0.665; acetylene black 0.9-1.1; triisocyanate 1.5-3.0; acetylacetonate 0.0055-0.0065; methylethylketone the rest. Magnetic suspension may contain-. harvest, wt.% ::.; magnetic particles 24.5, vinyl chloride / vinyl acetate copolymer 1.85, polyurethane rubber solution 24.0, a mixture of triethanol ammonium salts of mono- and dialkyl phosphates 1.25, diethylene glycol ester and Fractions Cj-Cg-branched fatty acid salts of 0.665, acetylene carbon black 1.1, triethoacyanate 3.0, acetyl acetonate 0.0065 and methyl ethyl ketone 43.6285, Magnetic suspension may also contain, by weight,%: magnetic particles 25.5, copolymer of vinyl chloride / vinip Magnetic suspension for the working layer of the carrier of magnesium of the pus of recording, consisting of magnetic particles, is distributed; divided into a mixture of a copolymer of vinyl chloride with viyl acetate, a solution of polyurethane rubber, acetylene black, methyl ethyl ketone, dispersant, plasticizer, hardener and catalyst, curing, o. t l and tsya with the fact that, in order to increase the service life of the magnetic recording carrier due to the increased wear resistance of its working layer, it contains as a dispersant a mixture of triethanolammonium salts of mono- and dialkyl phosphates, as a plasticizer — an ester of diethyl: lenglikol and fractions of C of p-branched salts — of extra acids, as a curing agent — triisocyanate, and as a curing agent — acetylacetonate at the following ratio of components, wt.%: Magnetic particles 24.5-25.5 Vinyl chloride copolymer with vinyl acetate1, 55-1.85 3 1287224. 4 PacTBup C-Cd Polyurethane Polyurethane Polyurethane 21,0-24,0 fatty salts A mixture of triethanol-acid 0,465-0,665 monium salts of mo-acetylene carbon black 0.9-1.1 but- and dialkylphosphate-triisocyanate 1.5-3.0 comrade 0.75-1.25 Acetylacetone. t 6.0055-0.0065 Diethyl-methyl ethyl ketone ester Else Langlikol and dress coat--. .